/* mailsrvr.c */
/* Synchronet Mail (SMTP/POP3) server and sendmail threads */
/* $Id$ */
/****************************************************************************
* @format.tab-size 4 (Plain Text/Source Code File Header) *
* @format.use-tabs true (see http://www.synchro.net/ptsc_hdr.html) *
* *
* Copyright 2005 Rob Swindell - http://www.synchro.net/copyright.html *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* See the GNU General Public License for more details: gpl.txt or *
* http://www.fsf.org/copyleft/gpl.html *
* *
* Anonymous FTP access to the most recent released source is available at *
* ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net *
* *
* Anonymous CVS access to the development source and modification history *
* is available at cvs.synchro.net:/cvsroot/sbbs, example: *
* cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs login *
* (just hit return, no password is necessary) *
* cvs -d :pserver:anonymous@cvs.synchro.net:/cvsroot/sbbs checkout src *
* *
* For Synchronet coding style and modification guidelines, see *
* http://www.synchro.net/source.html *
* *
* You are encouraged to submit any modifications (preferably in Unix diff *
* format) via e-mail to mods@synchro.net *
* *
* Note: If this box doesn't appear square, then you need to fix your tabs. *
****************************************************************************/
/* Platform-specific headers */
#ifdef _WIN32
#include <io.h> /* open/close */
#include <share.h> /* share open flags */
#include <process.h> /* _beginthread */
#include <windows.h> /* required for mmsystem.h */
#include <mmsystem.h> /* SND_ASYNC */
#endif
/* ANSI C Library headers */
#include <stdio.h>
#include <stdlib.h> /* ltoa in GNU C lib */
#include <stdarg.h> /* va_list */
#include <string.h> /* strrchr */
#include <ctype.h> /* isdigit */
#include <fcntl.h> /* Open flags */
#include <errno.h> /* errno */
/* Synchronet-specific headers */
#undef SBBS /* this shouldn't be defined unless building sbbs.dll/libsbbs.so */
#include "sbbs.h"
#include "mailsrvr.h"
#include "mime.h"
#include "md5.h"
#include "crc32.h"
#include "base64.h"
#include "ini_file.h"
#include "netwrap.h" /* getNameServerList() */
/* Constants */
#define FORWARD "forward:"
#define NO_FORWARD "local:"
int dns_getmx(char* name, char* mx, char* mx2
,DWORD intf, DWORD ip_addr, BOOL use_tcp, int timeout);
static char* pop_err = "-ERR";
static char* ok_rsp = "250 OK";
static char* auth_ok = "235 User Authenticated";
static char* sys_error = "421 System error";
static char* sys_unavail= "421 System unavailable, try again later";
static char* badarg_rsp = "501 Bad argument";
static char* badseq_rsp = "503 Bad sequence of commands";
static char* badauth_rsp= "535 Authentication failure";
static char* badrsp_err = "%s replied with:\r\n\"%s\"\r\n"
"instead of the expected reply:\r\n\"%s ...\"";
#define TIMEOUT_THREAD_WAIT 60 /* Seconds */
#define DNSBL_THROTTLE_VALUE 5000 /* Milliseconds */
#define STATUS_WFC "Listening"
static mail_startup_t* startup=NULL;
static scfg_t scfg;
static SOCKET server_socket=INVALID_SOCKET;
static SOCKET pop3_socket=INVALID_SOCKET;
static DWORD active_clients=0;
static int active_sendmail=0;
static DWORD thread_count=0;
static BOOL sendmail_running=FALSE;
static DWORD sockets=0;
static DWORD served=0;
static BOOL terminate_server=FALSE;
static BOOL terminate_sendmail=FALSE;
static sem_t sendmail_wakeup_sem;
static char revision[16];
static time_t uptime;
static str_list_t recycle_semfiles;
static str_list_t shutdown_semfiles;
static int mailproc_count;
struct mailproc {
char cmdline[INI_MAX_VALUE_LEN];
str_list_t to;
BOOL passthru;
BOOL native;
} *mailproc_list;
typedef struct {
SOCKET socket;
SOCKADDR_IN client_addr;
} smtp_t,pop3_t;
static int lprintf(int level, char *fmt, ...)
{
va_list argptr;
char sbuf[1024];
if(startup==NULL || startup->lputs==NULL)
return(0);
va_start(argptr,fmt);
vsnprintf(sbuf,sizeof(sbuf),fmt,argptr);
sbuf[sizeof(sbuf)-1]=0;
va_end(argptr);
return(startup->lputs(startup->cbdata,level,sbuf));
}
#ifdef _WINSOCKAPI_
static WSADATA WSAData;
#define SOCKLIB_DESC WSAData.szDescription
static BOOL WSAInitialized=FALSE;
static BOOL winsock_startup(void)
{
int status; /* Status Code */
if((status = WSAStartup(MAKEWORD(1,1), &WSAData))==0) {
lprintf(LOG_INFO,"%s %s",WSAData.szDescription, WSAData.szSystemStatus);
WSAInitialized=TRUE;
return (TRUE);
}
lprintf(LOG_CRIT,"!WinSock startup ERROR %d", status);
return (FALSE);
}
#else /* No WINSOCK */
#define winsock_startup() (TRUE)
#define SOCKLIB_DESC NULL
#endif
static void update_clients(void)
{
if(startup!=NULL && startup->clients!=NULL)
startup->clients(startup->cbdata,active_clients+active_sendmail);
}
static void client_on(SOCKET sock, client_t* client, BOOL update)
{
if(startup!=NULL && startup->client_on!=NULL)
startup->client_on(startup->cbdata,TRUE,sock,client,update);
}
static void client_off(SOCKET sock)
{
if(startup!=NULL && startup->client_on!=NULL)
startup->client_on(startup->cbdata,FALSE,sock,NULL,FALSE);
}
static void thread_up(BOOL setuid)
{
thread_count++;
if(startup!=NULL && startup->thread_up!=NULL)
startup->thread_up(startup->cbdata,TRUE,setuid);
}
static void thread_down(void)
{
if(thread_count>0)
thread_count--;
if(startup!=NULL && startup->thread_up!=NULL)
startup->thread_up(startup->cbdata,FALSE,FALSE);
}
SOCKET mail_open_socket(int type)
{
char error[256];
SOCKET sock;
sock=socket(AF_INET, type, IPPROTO_IP);
if(sock!=INVALID_SOCKET && startup!=NULL && startup->socket_open!=NULL)
startup->socket_open(startup->cbdata,TRUE);
if(sock!=INVALID_SOCKET) {
if(set_socket_options(&scfg, sock,error))
lprintf(LOG_ERR,"%04d !ERROR %s",sock,error);
sockets++;
#if 0 /*def _DEBUG */
lprintf(LOG_DEBUG,"%04d Socket opened (%d sockets in use)",sock,sockets);
#endif
}
return(sock);
}
int mail_close_socket(SOCKET sock)
{
int result;
if(sock==INVALID_SOCKET)
return(-1);
shutdown(sock,SHUT_RDWR); /* required on Unix */
result=closesocket(sock);
if(startup!=NULL && startup->socket_open!=NULL)
startup->socket_open(startup->cbdata,FALSE);
sockets--;
if(result!=0) {
if(ERROR_VALUE!=ENOTSOCK)
lprintf(LOG_ERR,"%04d !ERROR %d closing socket",sock, ERROR_VALUE);
}
#if 0 /*def _DEBUG */
else
lprintf(LOG_DEBUG,"%04d Socket closed (%d sockets in use)",sock,sockets);
#endif
return(result);
}
static void status(char* str)
{
if(startup!=NULL && startup->status!=NULL)
startup->status(startup->cbdata,str);
}
int sockprintf(SOCKET sock, char *fmt, ...)
{
int len;
int maxlen;
int result;
va_list argptr;
char sbuf[1024];
fd_set socket_set;
struct timeval tv;
va_start(argptr,fmt);
len=vsnprintf(sbuf,maxlen=sizeof(sbuf)-2,fmt,argptr);
va_end(argptr);
if(len<0 || len > maxlen) /* format error or output truncated */
len=maxlen;
if(startup->options&MAIL_OPT_DEBUG_TX)
lprintf(LOG_DEBUG,"%04d TX: %.*s", sock, len, sbuf);
memcpy(sbuf+len,"\r\n",2);
len+=2;
if(sock==INVALID_SOCKET) {
lprintf(LOG_WARNING,"!INVALID SOCKET in call to sockprintf");
return(0);
}
/* Check socket for writability (using select) */
tv.tv_sec=300;
tv.tv_usec=0;
FD_ZERO(&socket_set);
FD_SET(sock,&socket_set);
if((result=select(sock+1,NULL,&socket_set,NULL,&tv))<1) {
if(result==0)
lprintf(LOG_NOTICE,"%04d !TIMEOUT selecting socket for send"
,sock);
else
lprintf(LOG_NOTICE,"%04d !ERROR %d selecting socket for send"
,sock, ERROR_VALUE);
return(0);
}
while((result=sendsocket(sock,sbuf,len))!=len) {
if(result==SOCKET_ERROR) {
if(ERROR_VALUE==EWOULDBLOCK) {
YIELD();
continue;
}
if(ERROR_VALUE==ECONNRESET)
lprintf(LOG_NOTICE,"%04d Connection reset by peer on send",sock);
else if(ERROR_VALUE==ECONNABORTED)
lprintf(LOG_NOTICE,"%04d Connection aborted by peer on send",sock);
else
lprintf(LOG_NOTICE,"%04d !ERROR %d sending on socket",sock,ERROR_VALUE);
return(0);
}
lprintf(LOG_WARNING,"%04d !ERROR: short send on socket: %d instead of %d",sock,result,len);
}
return(len);
}
static time_t checktime(void)
{
struct tm tm;
memset(&tm,0,sizeof(tm));
tm.tm_year=94;
tm.tm_mday=1;
return(mktime(&tm)-0x2D24BD00L);
}
static void recverror(SOCKET socket, int rd, int line)
{
if(rd==0)
lprintf(LOG_NOTICE,"%04d Socket closed by peer on receive (line %d)"
,socket, line);
else if(rd==SOCKET_ERROR) {
if(ERROR_VALUE==ECONNRESET)
lprintf(LOG_NOTICE,"%04d Connection reset by peer on receive (line %d)"
,socket, line);
else if(ERROR_VALUE==ECONNABORTED)
lprintf(LOG_NOTICE,"%04d Connection aborted by peer on receive (line %d)"
,socket, line);
else
lprintf(LOG_NOTICE,"%04d !ERROR %d receiving on socket (line %d)"
,socket, ERROR_VALUE, line);
} else
lprintf(LOG_WARNING,"%04d !ERROR: recv on socket returned unexpected value: %d (line %d)"
,socket, rd, line);
}
static int sockreadline(SOCKET socket, char* buf, int len)
{
char ch;
int i,rd=0;
fd_set socket_set;
struct timeval tv;
time_t start;
buf[0]=0;
start=time(NULL);
if(socket==INVALID_SOCKET) {
lprintf(LOG_WARNING,"!INVALID SOCKET in call to sockreadline");
return(-1);
}
while(rd<len-1) {
if(server_socket==INVALID_SOCKET || terminate_server) {
lprintf(LOG_WARNING,"%04d !ABORTING sockreadline",socket);
return(-1);
}
tv.tv_sec=startup->max_inactivity;
tv.tv_usec=0;
FD_ZERO(&socket_set);
FD_SET(socket,&socket_set);
i=select(socket+1,&socket_set,NULL,NULL,&tv);
if(i<1) {
if(i==0) {
if((time(NULL)-start)>startup->max_inactivity) {
lprintf(LOG_WARNING,"%04d !SOCKET INACTIVE",socket);
return(-1);
}
continue;
}
recverror(socket,i,__LINE__);
return(-1);
}
i=recv(socket, &ch, 1, 0);
if(i<1) {
recverror(socket,i,__LINE__);
return(-1);
}
if(ch=='\n' /* && rd>=1 */ ) { /* Mar-9-2003: terminate on sole LF */
break;
}
buf[rd++]=ch;
}
if(rd>0 && buf[rd-1]=='\r')
rd--;
buf[rd]=0;
return(rd);
}
static BOOL sockgetrsp(SOCKET socket, char* rsp, char *buf, int len)
{
int rd;
while(1) {
rd = sockreadline(socket, buf, len);
if(rd<1)
return(FALSE);
if(buf[3]=='-') { /* Multi-line response */
if(startup->options&MAIL_OPT_DEBUG_RX_RSP)
lprintf(LOG_DEBUG,"%04d RX: %s",socket,buf);
continue;
}
if(rsp!=NULL && strnicmp(buf,rsp,strlen(rsp))) {
lprintf(LOG_WARNING,"%04d !INVALID RESPONSE: '%s' Expected: '%s'", socket, buf, rsp);
return(FALSE);
}
break;
}
if(startup->options&MAIL_OPT_DEBUG_RX_RSP)
lprintf(LOG_DEBUG,"%04d RX: %s",socket,buf);
return(TRUE);
}
#define MAX_LINE_LEN 1000
static ulong sockmimetext(SOCKET socket, smbmsg_t* msg, char* msgtxt, ulong maxlines
,str_list_t file_list, char* mime_boundary)
{
char toaddr[256]="";
char fromaddr[256]="";
char fromhost[256];
char date[64];
char* p;
char* tp;
char* content_type=NULL;
int i;
int s;
ulong lines;
/* HEADERS (in recommended order per RFC822 4.1) */
if(!sockprintf(socket,"Date: %s",msgdate(msg->hdr.when_written,date)))
return(0);
if((p=smb_get_hfield(msg,RFC822FROM,NULL))!=NULL)
s=sockprintf(socket,"From: %s",p); /* use original RFC822 header field */
else {
if(msg->from_net.type==NET_QWK && msg->from_net.addr!=NULL)
SAFEPRINTF2(fromaddr,"%s!%s"
,(char*)msg->from_net.addr
,usermailaddr(&scfg,fromhost,msg->from));
else if(msg->from_net.type==NET_FIDO && msg->from_net.addr!=NULL)
SAFECOPY(fromaddr,smb_faddrtoa((faddr_t *)msg->from_net.addr,NULL));
else if(msg->from_net.type!=NET_NONE && msg->from_net.addr!=NULL)
SAFECOPY(fromaddr,(char*)msg->from_net.addr);
else
usermailaddr(&scfg,fromaddr,msg->from);
if(fromaddr[0]=='<')
s=sockprintf(socket,"From: \"%s\" %s",msg->from,fromaddr);
else
s=sockprintf(socket,"From: \"%s\" <%s>",msg->from,fromaddr);
}
if(!s)
return(0);
if(msg->from_org!=NULL || msg->from_net.type==NET_NONE)
if(!sockprintf(socket,"Organization: %s"
,msg->from_org==NULL ? scfg.sys_name : msg->from_org))
return(0);
if(!sockprintf(socket,"Subject: %s",msg->subj))
return(0);
if((p=smb_get_hfield(msg,RFC822TO,NULL))!=NULL)
s=sockprintf(socket,"To: %s",p); /* use original RFC822 header field */
else {
if(strchr(msg->to,'@')!=NULL || msg->to_net.addr==NULL)
s=sockprintf(socket,"To: %s",msg->to); /* Avoid double-@ */
else if(msg->to_net.type==NET_INTERNET || msg->to_net.type==NET_QWK) {
if(strchr((char*)msg->to_net.addr,'<')!=NULL)
s=sockprintf(socket,"To: %s",(char*)msg->to_net.addr);
else
s=sockprintf(socket,"To: \"%s\" <%s>",msg->to,(char*)msg->to_net.addr);
} else {
usermailaddr(&scfg,toaddr,msg->to);
s=sockprintf(socket,"To: \"%s\" <%s>",msg->to,toaddr);
}
}
if(!s)
return(0);
if((p=smb_get_hfield(msg,RFC822REPLYTO,NULL))==NULL) {
if(msg->replyto_net.type==NET_INTERNET)
p=msg->replyto_net.addr;
else if(msg->replyto!=NULL)
p=msg->replyto;
}
if(p!=NULL)
s=sockprintf(socket,"Reply-To: %s",p); /* use original RFC822 header field */
if(!s)
return(0);
if(!sockprintf(socket,"Message-ID: %s",get_msgid(&scfg,INVALID_SUB,msg)))
return(0);
if(msg->reply_id!=NULL)
if(!sockprintf(socket,"In-Reply-To: %s",msg->reply_id))
return(0);
for(i=0;i<msg->total_hfields;i++) {
if(msg->hfield[i].type==RFC822HEADER) {
if(strnicmp((char*)msg->hfield_dat[i],"Content-Type:",13)==0)
content_type=msg->hfield_dat[i];
if(!sockprintf(socket,"%s",(char*)msg->hfield_dat[i]))
return(0);
}
}
/* Default MIME Content-Type for non-Internet messages */
if(msg->from_net.type!=NET_INTERNET && content_type==NULL) {
/* No content-type specified, so assume IBM code-page 437 (full ex-ASCII) */
sockprintf(socket,"Content-Type: text/plain; charset=IBM437");
sockprintf(socket,"Content-Transfer-Encoding: 8bit");
}
if(strListCount(file_list)) { /* File attachments */
mimeheaders(socket,mime_boundary);
sockprintf(socket,"");
mimeblurb(socket,mime_boundary);
sockprintf(socket,"");
mimetextpartheader(socket,mime_boundary);
}
if(!sockprintf(socket,"")) /* Header Terminator */
return(0);
/* MESSAGE BODY */
lines=0;
#if 0 /* This is now handled in smb_getmsgtxt() */
for(i=0;i<msg->total_hfields;i++) { /* delivery failure notification? */
if(msg->hfield[i].type==SMTPSYSMSG || msg->hfield[i].type==SMB_COMMENT) {
if(!sockprintf(socket,"%s",(char*)msg->hfield_dat[i]))
return(0);
lines++;
}
}
#endif
p=msgtxt;
while(*p && lines<maxlines) {
tp=strchr(p,'\n');
if(tp) {
if(tp-p>MAX_LINE_LEN)
tp=p+MAX_LINE_LEN;
*tp=0;
}
truncsp(p); /* Takes care of '\r' or spaces */
if(*p=='.')
i=sockprintf(socket,".%.*s",MAX_LINE_LEN,p);
else
i=sockprintf(socket,"%.*s",MAX_LINE_LEN,p);
if(!i)
break;
if(tp==NULL)
break;
p=tp+1;
lines++;
/* release time-slices every x lines */
if(startup->lines_per_yield
&& !(lines%startup->lines_per_yield))
YIELD();
}
if(file_list!=NULL) {
for(i=0;file_list[i];i++) {
sockprintf(socket,"");
lprintf(LOG_INFO,"%04u MIME Encoding and sending %s",socket,file_list[i]);
if(!mimeattach(socket,mime_boundary,file_list[i]))
lprintf(LOG_ERR,"%04u !ERROR opening/encoding/sending %s",socket,file_list[i]);
else {
endmime(socket,mime_boundary);
if(msg->hdr.auxattr&MSG_KILLFILE)
if(remove(file_list[i])!=0)
lprintf(LOG_WARNING,"%04u !ERROR %d removing %s",socket,errno,file_list[i]);
}
}
}
sockprintf(socket,"."); /* End of text */
return(lines);
}
static ulong sockmsgtxt(SOCKET socket, smbmsg_t* msg, char* msgtxt, ulong maxlines)
{
char filepath[MAX_PATH+1];
ulong retval;
char* boundary=NULL;
unsigned i;
str_list_t file_list=NULL;
str_list_t split;
if(msg->hdr.auxattr&MSG_FILEATTACH) {
boundary = mimegetboundary();
file_list = strListInit();
/* Parse header fields */
for(i=0;i<msg->total_hfields;i++)
if(msg->hfield[i].type==FILEATTACH)
strListPush(&file_list,(char*)msg->hfield_dat[i]);
/* Parse subject (if necessary) */
if(!strListCount(file_list)) { /* filename(s) stored in subject */
split=strListSplitCopy(NULL,msg->subj," ");
if(split!=NULL) {
for(i=0;split[i];i++) {
if(msg->idx.to!=0)
SAFEPRINTF3(filepath,"%sfile/%04u.in/%s"
,scfg.data_dir,msg->idx.to,getfname(truncsp(split[i])));
else
SAFEPRINTF3(filepath,"%sfile/%04u.out/%s"
,scfg.data_dir,msg->idx.from,getfname(truncsp(split[i])));
strListPush(&file_list,filepath);
}
strListFree(&split);
}
}
}
retval = sockmimetext(socket,msg,msgtxt,maxlines,file_list,boundary);
strListFree(&file_list);
if(boundary!=NULL)
free(boundary);
return(retval);
}
static u_long resolve_ip(char *inaddr)
{
char* p;
char* addr;
char buf[128];
HOSTENT* host;
SAFECOPY(buf,inaddr);
addr=buf;
if(*addr=='[' && *(p=lastchar(addr))==']') { /* Support [ip_address] notation */
addr++;
*p=0;
}
if(*addr==0)
return((u_long)INADDR_NONE);
for(p=addr;*p;p++)
if(*p!='.' && !isdigit(*p))
break;
if(!(*p))
return(inet_addr(addr));
if((host=gethostbyname(inaddr))==NULL) {
lprintf(LOG_WARNING,"0000 !ERROR resolving hostname: %s",inaddr);
return((u_long)INADDR_NONE);
}
return(*((ulong*)host->h_addr_list[0]));
}
static void pop3_thread(void* arg)
{
char* p;
char str[128];
char buf[512];
char host_name[128];
char host_ip[64];
char username[LEN_ALIAS+1];
char password[LEN_PASS+1];
char challenge[256];
char digest[MD5_DIGEST_SIZE];
char* response="";
char* msgtxt;
int i;
int rd;
BOOL activity=FALSE;
BOOL apop=FALSE;
long l;
ulong lines;
ulong lines_sent;
long msgs,msgnum;
ulong bytes;
SOCKET socket;
HOSTENT* host;
smb_t smb;
smbmsg_t msg;
user_t user;
client_t client;
mail_t* mail;
pop3_t pop3=*(pop3_t*)arg;
thread_up(TRUE /* setuid */);
free(arg);
socket=pop3.socket;
if(startup->options&MAIL_OPT_DEBUG_POP3)
lprintf(LOG_DEBUG,"%04d POP3 session thread started", socket);
#ifdef _WIN32
if(startup->pop3_sound[0] && !(startup->options&MAIL_OPT_MUTE))
PlaySound(startup->pop3_sound, NULL, SND_ASYNC|SND_FILENAME);
#endif
SAFECOPY(host_ip,inet_ntoa(pop3.client_addr.sin_addr));
if(startup->options&MAIL_OPT_DEBUG_POP3)
lprintf(LOG_INFO,"%04d POP3 connection accepted from: %s port %u"
,socket, host_ip, ntohs(pop3.client_addr.sin_port));
if(startup->options&MAIL_OPT_NO_HOST_LOOKUP)
host=NULL;
else
host=gethostbyaddr((char *)&pop3.client_addr.sin_addr
,sizeof(pop3.client_addr.sin_addr),AF_INET);
if(host!=NULL && host->h_name!=NULL)
SAFECOPY(host_name,host->h_name);
else
strcpy(host_name,"<no name>");
if(startup->options&MAIL_OPT_DEBUG_POP3
&& !(startup->options&MAIL_OPT_NO_HOST_LOOKUP)) {
lprintf(LOG_INFO,"%04d POP3 Hostname: %s", socket, host_name);
for(i=0;host!=NULL && host->h_aliases!=NULL && host->h_aliases[i]!=NULL;i++)
lprintf(LOG_INFO,"%04d POP3 HostAlias: %s", socket, host->h_aliases[i]);
}
if(trashcan(&scfg,host_ip,"ip")) {
lprintf(LOG_NOTICE,"%04d !POP3 BLOCKED CLIENT IP ADDRESS: %s"
,socket, host_ip);
sockprintf(socket,"-ERR Access denied.");
mail_close_socket(socket);
thread_down();
return;
}
if(trashcan(&scfg,host_name,"host")) {
lprintf(LOG_NOTICE,"%04d !POP3 BLOCKED CLIENT HOSTNAME: %s"
,socket, host_name);
sockprintf(socket,"-ERR Access denied.");
mail_close_socket(socket);
thread_down();
return;
}
active_clients++, update_clients();
/* Initialize client display */
client.size=sizeof(client);
client.time=time(NULL);
SAFECOPY(client.addr,host_ip);
SAFECOPY(client.host,host_name);
client.port=ntohs(pop3.client_addr.sin_port);
client.protocol="POP3";
client.user="<unknown>";
client_on(socket,&client,FALSE /* update */);
SAFEPRINTF(str,"POP3: %s", host_ip);
status(str);
mail=NULL;
do {
memset(&smb,0,sizeof(smb));
memset(&msg,0,sizeof(msg));
memset(&user,0,sizeof(user));
password[0]=0;
srand(time(NULL) ^ (DWORD)GetCurrentThreadId()); /* seed random number generator */
rand(); /* throw-away first result */
safe_snprintf(challenge,sizeof(challenge),"<%x%x%lx%lx@%.128s>"
,rand(),socket,(ulong)time(NULL),clock(),startup->host_name);
sockprintf(socket,"+OK Synchronet POP3 Server %s-%s Ready %s"
,revision,PLATFORM_DESC,challenge);
/* Requires USER command first */
for(i=3;i;i--) {
if(!sockgetrsp(socket,NULL,buf,sizeof(buf)))
break;
if(!strnicmp(buf,"USER ",5))
break;
if(!strnicmp(buf,"APOP ",5)) {
apop=TRUE;
break;
}
sockprintf(socket,"-ERR USER or APOP command expected");
}
if(!i || buf[0]==0) /* no USER or APOP command received */
break;
p=buf+5;
SKIP_WHITESPACE(p);
if(apop) {
if((response=strrchr(p,' '))!=NULL)
*(response++)=0;
else
response=p;
}
SAFECOPY(username,p);
if(!apop) {
sockprintf(socket,"+OK");
if(!sockgetrsp(socket,"PASS ",buf,sizeof(buf))) {
sockprintf(socket,"-ERR PASS command expected");
break;
}
p=buf+5;
SKIP_WHITESPACE(p);
SAFECOPY(password,p);
}
user.number=matchuser(&scfg,username,FALSE /*sysop_alias*/);
if(!user.number) {
if(scfg.sys_misc&SM_ECHO_PW)
lprintf(LOG_WARNING,"%04d !POP3 UNKNOWN USER: %s (password: %s)"
,socket, username, password);
else
lprintf(LOG_WARNING,"%04d !POP3 UNKNOWN USER: %s"
,socket, username);
sockprintf(socket,pop_err);
break;
}
if((i=getuserdat(&scfg, &user))!=0) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d getting data on user (%s)"
,socket, i, username);
sockprintf(socket, pop_err);
break;
}
if(user.misc&(DELETED|INACTIVE)) {
lprintf(LOG_WARNING,"%04d !POP3 DELETED or INACTIVE user #%u (%s)"
,socket, user.number, username);
sockprintf(socket, pop_err);
break;
}
if(apop) {
strlwr(user.pass); /* this is case-sensitive, so convert to lowercase */
strcat(challenge,user.pass);
MD5_calc(digest,challenge,strlen(challenge));
MD5_hex(str,digest);
if(strcmp(str,response)) {
lprintf(LOG_WARNING,"%04d !POP3 %s FAILED APOP authentication"
,socket,username);
#if 0
lprintf(LOG_DEBUG,"%04d !POP3 digest data: %s",socket,challenge);
lprintf(LOG_DEBUG,"%04d !POP3 calc digest: %s",socket,str);
lprintf(LOG_DEBUG,"%04d !POP3 resp digest: %s",socket,response);
#endif
sockprintf(socket,pop_err);
break;
}
} else if(stricmp(password,user.pass)) {
if(scfg.sys_misc&SM_ECHO_PW)
lprintf(LOG_WARNING,"%04d !POP3 FAILED Password attempt for user %s: '%s' expected '%s'"
,socket, username, password, user.pass);
else
lprintf(LOG_WARNING,"%04d !POP3 FAILED Password attempt for user %s"
,socket, username);
sockprintf(socket, pop_err);
break;
}
putuserrec(&scfg,user.number,U_COMP,LEN_COMP,host_name);
putuserrec(&scfg,user.number,U_NOTE,LEN_NOTE,host_ip);
/* Update client display */
client.user=user.alias;
client_on(socket,&client,TRUE /* update */);
if(startup->options&MAIL_OPT_DEBUG_POP3)
lprintf(LOG_INFO,"%04d POP3 %s logged in %s", socket, user.alias, apop ? "via APOP":"");
SAFEPRINTF(str,"POP3: %s",user.alias);
status(str);
sprintf(smb.file,"%smail",scfg.data_dir);
if(smb_islocked(&smb)) {
lprintf(LOG_WARNING,"%04d !POP3 MAIL BASE LOCKED: %s",socket,smb.last_error);
sockprintf(socket,"-ERR database locked, try again later");
break;
}
smb.retry_time=scfg.smb_retry_time;
smb.subnum=INVALID_SUB;
if((i=smb_open(&smb))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) opening %s",socket,i,smb.last_error,smb.file);
sockprintf(socket,"-ERR %d opening %s",i,smb.file);
break;
}
mail=loadmail(&smb,&msgs,user.number,MAIL_YOUR,0);
for(l=bytes=0;l<msgs;l++) {
msg.hdr.number=mail[l].number;
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
break;
}
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
break;
}
i=smb_getmsghdr(&smb,&msg);
smb_unlockmsghdr(&smb,&msg);
if(i!=0) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
break;
}
bytes+=smb_getmsgtxtlen(&msg);
smb_freemsgmem(&msg);
}
if(l<msgs) {
sockprintf(socket,"-ERR message #%d: %d (%s)"
,mail[l].number,i,smb.last_error);
break;
}
sockprintf(socket,"+OK %lu messages (%lu bytes)",msgs,bytes);
while(1) { /* TRANSACTION STATE */
rd = sockreadline(socket, buf, sizeof(buf));
if(rd<0)
break;
truncsp(buf);
if(startup->options&MAIL_OPT_DEBUG_POP3)
lprintf(LOG_DEBUG,"%04d POP3 RX: %s", socket, buf);
if(!stricmp(buf, "NOOP")) {
sockprintf(socket,"+OK");
continue;
}
if(!stricmp(buf, "QUIT")) {
sockprintf(socket,"+OK");
break;
}
if(!stricmp(buf, "STAT")) {
sockprintf(socket,"+OK %lu %lu",msgs,bytes);
continue;
}
if(!stricmp(buf, "RSET")) {
if((i=smb_locksmbhdr(&smb))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) locking message base"
,socket, i, smb.last_error);
sockprintf(socket,"-ERR %d locking message base",i);
continue;
}
for(l=0;l<msgs;l++) {
msg.hdr.number=mail[l].number;
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
break;
}
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
break;
}
if((i=smb_getmsghdr(&smb,&msg))!=SMB_SUCCESS) {
smb_unlockmsghdr(&smb,&msg);
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
break;
}
msg.hdr.attr=mail[l].attr;
if((i=smb_putmsg(&smb,&msg))!=SMB_SUCCESS)
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) updating message index"
,socket, i, smb.last_error);
smb_unlockmsghdr(&smb,&msg);
smb_freemsgmem(&msg);
}
smb_unlocksmbhdr(&smb);
if(l<msgs)
sockprintf(socket,"-ERR %d messages reset (ERROR: %d)",l,i);
else
sockprintf(socket,"+OK %lu messages (%lu bytes)",msgs,bytes);
continue;
}
if(!strnicmp(buf, "LIST",4) || !strnicmp(buf,"UIDL",4)) {
p=buf+4;
SKIP_WHITESPACE(p);
if(isdigit(*p)) {
msgnum=atol(p);
if(msgnum<1 || msgnum>msgs) {
lprintf(LOG_WARNING,"%04d !POP3 INVALID message #%ld"
,socket, msgnum);
sockprintf(socket,"-ERR no such message");
continue;
}
msg.hdr.number=mail[msgnum-1].number;
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
sockprintf(socket,"-ERR %d getting message index",i);
break;
}
if(msg.idx.attr&MSG_DELETE) {
lprintf(LOG_WARNING,"%04d !POP3 ATTEMPT to list DELETED message"
,socket);
sockprintf(socket,"-ERR message deleted");
continue;
}
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR %d locking message header",i);
continue;
}
i=smb_getmsghdr(&smb,&msg);
smb_unlockmsghdr(&smb,&msg);
if(i!=0) {
smb_freemsgmem(&msg);
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR %d getting message header",i);
continue;
}
if(!strnicmp(buf, "LIST",4)) {
sockprintf(socket,"+OK %lu %lu",msgnum,smb_getmsgtxtlen(&msg));
} else /* UIDL */
sockprintf(socket,"+OK %lu %lu",msgnum,msg.hdr.number);
smb_freemsgmem(&msg);
continue;
}
/* List ALL messages */
sockprintf(socket,"+OK %lu messages (%lu bytes)",msgs,bytes);
for(l=0;l<msgs;l++) {
msg.hdr.number=mail[l].number;
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
break;
}
if(msg.idx.attr&MSG_DELETE)
continue;
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
break;
}
i=smb_getmsghdr(&smb,&msg);
smb_unlockmsghdr(&smb,&msg);
if(i!=0) {
smb_freemsgmem(&msg);
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
break;
}
if(!strnicmp(buf, "LIST",4)) {
sockprintf(socket,"%lu %lu",l+1,smb_getmsgtxtlen(&msg));
} else /* UIDL */
sockprintf(socket,"%lu %lu",l+1,msg.hdr.number);
smb_freemsgmem(&msg);
}
sockprintf(socket,".");
continue;
}
activity=TRUE;
if(!strnicmp(buf, "RETR ",5) || !strnicmp(buf,"TOP ",4)) {
SAFEPRINTF(str,"POP3: %s", user.alias);
status(str);
lines=-1;
p=buf+4;
SKIP_WHITESPACE(p);
msgnum=atol(p);
if(!strnicmp(buf,"TOP ",4)) {
SKIP_DIGIT(p);
SKIP_WHITESPACE(p);
lines=atol(p);
}
if(msgnum<1 || msgnum>msgs) {
lprintf(LOG_WARNING,"%04d !POP3 %s ATTEMPTED to retrieve an INVALID message #%ld"
,socket, user.alias, msgnum);
sockprintf(socket,"-ERR no such message");
continue;
}
msg.hdr.number=mail[msgnum-1].number;
lprintf(LOG_INFO,"%04d POP3 %s retrieving message #%ld"
,socket, user.alias, msg.hdr.number);
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
sockprintf(socket,"-ERR %d getting message index",i);
continue;
}
if(msg.idx.attr&MSG_DELETE) {
lprintf(LOG_WARNING,"%04d !POP3 ATTEMPT to retrieve DELETED message"
,socket);
sockprintf(socket,"-ERR message deleted");
continue;
}
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR %d locking message header",i);
continue;
}
i=smb_getmsghdr(&smb,&msg);
smb_unlockmsghdr(&smb,&msg);
if(i!=0) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR %d getting message header",i);
continue;
}
if((msgtxt=smb_getmsgtxt(&smb,&msg,GETMSGTXT_ALL))==NULL) {
smb_freemsgmem(&msg);
lprintf(LOG_ERR,"%04d !POP3 ERROR (%s) retrieving message %lu text"
,socket, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR retrieving message text");
continue;
}
sockprintf(socket,"+OK message follows");
lprintf(LOG_DEBUG,"%04d POP3 sending message text (%u bytes)"
,socket,strlen(msgtxt));
lines_sent=sockmsgtxt(socket,&msg,msgtxt,lines);
/* if(startup->options&MAIL_OPT_DEBUG_POP3) */
if(lines!=-1 && lines_sent<lines) /* could send *more* lines */
lprintf(LOG_ERR,"%04d !POP3 ERROR sending message text (sent %ld of %ld lines)"
,socket,lines_sent,lines);
else {
lprintf(LOG_DEBUG,"%04d POP3 message transfer complete (%lu lines)"
,socket,lines_sent);
if((i=smb_locksmbhdr(&smb))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) locking message base"
,socket, i, smb.last_error);
} else {
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
} else {
msg.hdr.attr|=MSG_READ;
msg.hdr.netattr|=MSG_SENT;
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS)
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
if((i=smb_putmsg(&smb,&msg))!=SMB_SUCCESS)
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) marking message #%lu as read"
,socket, i, smb.last_error, msg.hdr.number);
smb_unlockmsghdr(&smb,&msg);
}
smb_unlocksmbhdr(&smb);
}
}
smb_freemsgmem(&msg);
smb_freemsgtxt(msgtxt);
continue;
}
if(!strnicmp(buf, "DELE ",5)) {
p=buf+5;
SKIP_WHITESPACE(p);
msgnum=atol(p);
if(msgnum<1 || msgnum>msgs) {
lprintf(LOG_WARNING,"%04d !POP3 %s ATTEMPTED to delete an INVALID message #%ld"
,socket, user.alias, msgnum);
sockprintf(socket,"-ERR no such message");
continue;
}
msg.hdr.number=mail[msgnum-1].number;
lprintf(LOG_INFO,"%04d POP3 %s deleting message #%ld"
,socket, user.alias, msg.hdr.number);
if((i=smb_locksmbhdr(&smb))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) locking message base"
,socket, i, smb.last_error);
sockprintf(socket,"-ERR %d locking message base",i);
continue;
}
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
smb_unlocksmbhdr(&smb);
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message index"
,socket, i, smb.last_error);
sockprintf(socket,"-ERR %d getting message index",i);
continue;
}
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
smb_unlocksmbhdr(&smb);
lprintf(LOG_WARNING,"%04d !POP3 ERROR %d (%s) locking message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR %d locking message header",i);
continue;
}
if((i=smb_getmsghdr(&smb,&msg))!=SMB_SUCCESS) {
smb_unlockmsghdr(&smb,&msg);
smb_unlocksmbhdr(&smb);
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) getting message header #%lu"
,socket, i, smb.last_error, msg.hdr.number);
sockprintf(socket,"-ERR %d getting message header",i);
continue;
}
msg.hdr.attr|=MSG_DELETE;
if((i=smb_putmsg(&smb,&msg))==SMB_SUCCESS && msg.hdr.auxattr&MSG_FILEATTACH)
delfattach(&scfg,&msg);
smb_unlockmsghdr(&smb,&msg);
smb_unlocksmbhdr(&smb);
smb_freemsgmem(&msg);
if(i!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !POP3 ERROR %d (%s) marking message as read"
, socket, i, smb.last_error);
sockprintf(socket,"-ERR %d marking message for deletion",i);
continue;
}
sockprintf(socket,"+OK");
if(startup->options&MAIL_OPT_DEBUG_POP3)
lprintf(LOG_INFO,"%04d POP3 message deleted", socket);
continue;
}
lprintf(LOG_WARNING,"%04d !POP3 UNSUPPORTED COMMAND from %s: '%s'"
,socket, user.alias, buf);
sockprintf(socket,"-ERR UNSUPPORTED COMMAND: %s",buf);
}
if(user.number)
logoutuserdat(&scfg,&user,time(NULL),client.time);
} while(0);
if(activity)
lprintf(LOG_INFO,"%04d POP3 %s logged out from port %u on %s [%s]"
,socket, user.alias, ntohs(pop3.client_addr.sin_port), host_name, host_ip);
status(STATUS_WFC);
/* Free up resources here */
if(mail!=NULL)
freemail(mail);
smb_freemsgmem(&msg);
smb_close(&smb);
if(active_clients)
active_clients--, update_clients();
client_off(socket);
thread_down();
if(startup->options&MAIL_OPT_DEBUG_POP3)
lprintf(LOG_DEBUG,"%04d POP3 session thread terminated (%u threads remain, %lu clients served)"
,socket, thread_count, served);
/* Must be last */
mail_close_socket(socket);
}
static ulong rblchk(SOCKET sock, DWORD mail_addr_n, const char* rbl_addr)
{
char name[256];
DWORD mail_addr;
HOSTENT* host;
struct in_addr dnsbl_result;
mail_addr=ntohl(mail_addr_n);
safe_snprintf(name,sizeof(name),"%ld.%ld.%ld.%ld.%.128s"
,mail_addr&0xff
,(mail_addr>>8)&0xff
,(mail_addr>>16)&0xff
,(mail_addr>>24)&0xff
,rbl_addr
);
if(startup->options&MAIL_OPT_DNSBL_DEBUG)
lprintf(LOG_DEBUG,"%04d SMTP DNSBL Query: %s",sock,name);
if((host=gethostbyname(name))==NULL)
return(0);
dnsbl_result.s_addr = *((ulong*)host->h_addr_list[0]);
lprintf(LOG_INFO,"%04d SMTP DNSBL Query: %s resolved to: %s"
,sock,name,inet_ntoa(dnsbl_result));
return(dnsbl_result.s_addr);
}
static ulong dns_blacklisted(SOCKET sock, IN_ADDR addr, char* host_name, char* list, char* dnsbl_ip)
{
char fname[MAX_PATH+1];
char str[256];
char* p;
char* tp;
FILE* fp;
ulong found=0;
sprintf(fname,"%sdnsbl_exempt.cfg",scfg.ctrl_dir);
if(findstr(inet_ntoa(addr),fname))
return(FALSE);
if(findstr(host_name,fname))
return(FALSE);
sprintf(fname,"%sdns_blacklist.cfg", scfg.ctrl_dir);
if((fp=fopen(fname,"r"))==NULL)
return(FALSE);
while(!feof(fp) && !found) {
if(fgets(str,sizeof(str),fp)==NULL)
break;
truncsp(str);
p=str;
SKIP_WHITESPACE(p);
if(*p==';' || *p==0) /* comment or blank line */
continue;
sprintf(list,"%.100s",p);
/* terminate */
tp = p;
FIND_WHITESPACE(tp);
*tp=0;
found = rblchk(sock, addr.s_addr, p);
}
fclose(fp);
if(found)
strcpy(dnsbl_ip, inet_ntoa(addr));
return(found);
}
static BOOL chk_email_addr(SOCKET socket, char* p, char* host_name, char* host_ip
,char* to, char* from)
{
char addr[64];
char tmp[128];
SKIP_WHITESPACE(p);
if(*p=='<') p++; /* Skip '<' */
SAFECOPY(addr,p);
truncstr(addr,">( ");
if(!trashcan(&scfg,addr,"email"))
return(TRUE);
lprintf(LOG_NOTICE,"%04d !SMTP BLOCKED SOURCE: %s"
,socket, addr);
SAFEPRINTF(tmp,"Blocked source e-mail address: %s", addr);
spamlog(&scfg, "SMTP", "REFUSED", tmp, host_name, host_ip, to, from);
sockprintf(socket, "554 Sender not allowed.");
return(FALSE);
}
static void signal_smtp_sem(void)
{
int file;
if(scfg.smtpmail_sem[0]==0)
return; /* do nothing */
if((file=open(scfg.smtpmail_sem,O_WRONLY|O_CREAT|O_TRUNC))!=-1)
close(file);
}
/*****************************************************************************/
/* Returns command line generated from instr with %c replacments */
/*****************************************************************************/
static char* mailcmdstr(char* instr, char* msgpath, char* lstpath, char* errpath
,char* host, char* ip, uint usernum
,char* sender, char* sender_addr, char* reverse_path, char* cmd)
{
char str[1024];
int i,j,len;
len=strlen(instr);
for(i=j=0;i<len;i++) {
if(instr[i]=='%') {
i++;
cmd[j]=0;
switch(toupper(instr[i])) {
case 'E':
strcat(cmd,errpath);
break;
case 'H':
strcat(cmd,host);
break;
case 'I':
strcat(cmd,ip);
break;
case 'G': /* Temp directory */
strcat(cmd,scfg.temp_dir);
break;
case 'J':
strcat(cmd,scfg.data_dir);
break;
case 'K':
strcat(cmd,scfg.ctrl_dir);
break;
case 'L':
strcat(cmd,lstpath);
break;
case 'F':
case 'M':
strcat(cmd,msgpath);
break;
case 'O': /* SysOp */
strcat(cmd,scfg.sys_op);
break;
case 'Q': /* QWK ID */
strcat(cmd,scfg.sys_id);
break;
case 'R': /* reverse path */
strcat(cmd,reverse_path);
break;
case 'S': /* sender name */
strcat(cmd,sender);
break;
case 'A': /* sender address */
strcat(cmd,sender_addr);
break;
case 'V': /* Synchronet Version */
sprintf(str,"%s%c",VERSION,REVISION);
strcat(cmd,str);
break;
case 'Z':
strcat(cmd,scfg.text_dir);
break;
case '!': /* EXEC Directory */
strcat(cmd,scfg.exec_dir);
break;
case '%': /* %% for percent sign */
strcat(cmd,"%");
break;
case '?': /* Platform */
#ifdef __OS2__
SAFECOPY(str,"OS2");
#else
SAFECOPY(str,PLATFORM_DESC);
#endif
strlwr(str);
strcat(cmd,str);
break;
case 'U': /* User number */
sprintf(str,"%u",usernum);
strcat(cmd,str);
break;
default: /* unknown specification */
break;
}
j=strlen(cmd);
}
else
cmd[j++]=instr[i];
}
cmd[j]=0;
return(cmd);
}
#ifdef JAVASCRIPT
static void
js_ErrorReporter(JSContext *cx, const char *message, JSErrorReport *report)
{
char line[64];
char file[MAX_PATH+1];
char* warning;
SOCKET* sock;
if((sock=(SOCKET*)JS_GetContextPrivate(cx))==NULL)
return;
if(report==NULL) {
lprintf(LOG_ERR,"!JavaScript: %s", message);
return;
}
if(report->filename)
SAFEPRINTF(file," %s",report->filename);
else
file[0]=0;
if(report->lineno)
SAFEPRINTF(line," line %u",report->lineno);
else
line[0]=0;
if(JSREPORT_IS_WARNING(report->flags)) {
if(JSREPORT_IS_STRICT(report->flags))
warning="strict warning";
else
warning="warning";
} else
warning="";
lprintf(LOG_ERR,"%04d !JavaScript %s%s%s: %s"
,*sock, warning ,file, line, message);
}
static JSBool
js_log(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
uintN i=0;
int32 level=LOG_INFO;
JSString* str=NULL;
SOCKET* sock;
if((sock=(SOCKET*)JS_GetContextPrivate(cx))==NULL)
return(JS_FALSE);
if(JSVAL_IS_NUMBER(argv[i]))
JS_ValueToInt32(cx,argv[i++],&level);
for(; i<argc; i++) {
if((str=JS_ValueToString(cx, argv[i]))==NULL)
return(JS_FALSE);
lprintf(level,"%04d JavaScript: %s",*sock,JS_GetStringBytes(str));
}
if(str==NULL)
*rval = JSVAL_VOID;
else
*rval = STRING_TO_JSVAL(str);
return(JS_TRUE);
}
static JSFunctionSpec js_global_functions[] = {
{"write", js_log, 0},
{"writeln", js_log, 0},
{"print", js_log, 0},
{"log", js_log, 0},
{0}
};
static BOOL
js_mailproc(SOCKET sock, client_t* client, user_t* user
,char* cmdline
,char* msgtxt_fname, char* rcptlst_fname, char* proc_err_fname
,char* sender, char* sender_addr, char* reverse_path)
{
char* p;
char fname[MAX_PATH+1];
char path[MAX_PATH+1];
char arg[MAX_PATH+1];
BOOL success=FALSE;
JSRuntime* js_runtime=NULL;
JSContext* js_cx=NULL;
JSObject* js_glob;
JSObject* argv;
jsuint argc;
JSScript* js_script;
js_branch_t js_branch;
jsval val;
jsval rval=JSVAL_VOID;
ZERO_VAR(js_branch);
SAFECOPY(fname,cmdline);
truncstr(fname," \t");
if(getfext(fname)==NULL) /* No extension specified, assume '.js' */
strcat(fname,".js");
SAFECOPY(path,fname);
if(getfname(path)==path) /* No path specified, assume exec_dir */
sprintf(path,"%s%s",scfg.exec_dir,fname);
do {
lprintf(LOG_DEBUG,"%04d JavaScript: Creating runtime: %lu bytes\n"
,sock, startup->js.max_bytes);
if((js_runtime = JS_NewRuntime(startup->js.max_bytes))==NULL)
break;
lprintf(LOG_DEBUG,"%04d JavaScript: Initializing context (stack: %lu bytes)\n"
,sock, startup->js.cx_stack);
if((js_cx = JS_NewContext(js_runtime, startup->js.cx_stack))==NULL)
break;
JS_SetErrorReporter(js_cx, js_ErrorReporter);
JS_SetContextPrivate(js_cx, &sock);
/* Global Object */
if((js_glob=js_CreateGlobalObject(js_cx, &scfg, NULL))==NULL)
break;
if (!JS_DefineFunctions(js_cx, js_glob, js_global_functions))
break;
/* Internal JS Object */
if(js_CreateInternalJsObject(js_cx, js_glob, &js_branch)==NULL)
break;
/* Client Object */
if(js_CreateClientObject(js_cx, js_glob, "client", client, sock)==NULL)
break;
/* System Object */
if(js_CreateSystemObject(js_cx, js_glob, &scfg, uptime, startup->host_name, SOCKLIB_DESC)==NULL)
break;
/* Socket Class */
if(js_CreateSocketClass(js_cx, js_glob)==NULL)
break;
/* MsgBase Class */
if(js_CreateMsgBaseClass(js_cx, js_glob, &scfg)==NULL)
break;
/* File Class */
if(js_CreateFileClass(js_cx, js_glob)==NULL)
break;
/* User class */
if(js_CreateUserClass(js_cx, js_glob, &scfg)==NULL)
break;
/* Area and "user" Objects */
if(!js_CreateUserObjects(js_cx, js_glob, &scfg, user, NULL, NULL))
break;
/* Convert command-line to argv/argc */
argv=JS_NewArrayObject(js_cx, 0, NULL);
JS_DefineProperty(js_cx, js_glob, "argv", OBJECT_TO_JSVAL(argv)
,NULL,NULL,JSPROP_READONLY|JSPROP_ENUMERATE);
p=cmdline;
FIND_WHITESPACE(p);
SKIP_WHITESPACE(p);
for(argc=0;*p;argc++) {
SAFECOPY(arg,p);
truncstr(arg," \t");
val=STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,arg));
if(!JS_SetElement(js_cx, argv, argc, &val))
break;
FIND_WHITESPACE(p);
SKIP_WHITESPACE(p);
}
JS_DefineProperty(js_cx, js_glob, "argc", INT_TO_JSVAL(argc)
,NULL,NULL,JSPROP_READONLY|JSPROP_ENUMERATE);
/* Mailproc "API" filenames */
JS_DefineProperty(js_cx, js_glob, "message_text_filename"
,STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,msgtxt_fname))
,NULL,NULL,JSPROP_ENUMERATE|JSPROP_READONLY);
JS_DefineProperty(js_cx, js_glob, "recipient_list_filename"
,STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,rcptlst_fname))
,NULL,NULL,JSPROP_ENUMERATE|JSPROP_READONLY);
JS_DefineProperty(js_cx, js_glob, "processing_error_filename"
,STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,proc_err_fname))
,NULL,NULL,JSPROP_ENUMERATE|JSPROP_READONLY);
JS_DefineProperty(js_cx, js_glob, "sender_name"
,STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,sender))
,NULL,NULL,JSPROP_ENUMERATE|JSPROP_READONLY);
JS_DefineProperty(js_cx, js_glob, "sender_address"
,STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,sender_addr))
,NULL,NULL,JSPROP_ENUMERATE|JSPROP_READONLY);
JS_DefineProperty(js_cx, js_glob, "reverse_path"
,STRING_TO_JSVAL(JS_NewStringCopyZ(js_cx,reverse_path))
,NULL,NULL,JSPROP_ENUMERATE|JSPROP_READONLY);
if((js_script=JS_CompileFile(js_cx, js_glob, path))==NULL)
break;
success=JS_ExecuteScript(js_cx, js_glob, js_script, &rval);
js_EvalOnExit(js_cx, js_glob, &js_branch);
} while(0);
if(js_cx!=NULL)
JS_DestroyContext(js_cx);
if(js_runtime!=NULL)
JS_DestroyRuntime(js_runtime);
return(success);
}
#endif
static int parse_header_field(uchar* buf, smbmsg_t* msg, ushort* type)
{
char* p;
char field[128];
int len;
ushort nettype;
if(buf[0]<=' ' && *type!=UNKNOWN) { /* folded header, append to previous */
p=buf;
truncsp(p);
smb_hfield_append_str(msg,*type,"\r\n");
return smb_hfield_append_str(msg, *type, p);
}
if((p=strchr(buf,':'))==NULL)
return smb_hfield_str(msg, *type=RFC822HEADER, buf);
len=(ulong)p-(ulong)buf;
if(len>sizeof(field)-1)
len=sizeof(field)-1;
sprintf(field,"%.*s",len,buf);
truncsp(field);
p++; /* skip colon */
SKIP_WHITESPACE(p);
truncsp(p);
if(!stricmp(field, "TO"))
return smb_hfield_str(msg, *type=RFC822TO, p);
if(!stricmp(field, "REPLY-TO")) {
smb_hfield_str(msg, *type=RFC822REPLYTO, p);
if(*p=='<') {
p++;
truncstr(p,">");
}
nettype=NET_INTERNET;
smb_hfield(msg, REPLYTONETTYPE, sizeof(nettype), &nettype);
return smb_hfield_str(msg, *type=REPLYTONETADDR, p);
}
if(!stricmp(field, "FROM"))
return smb_hfield_str(msg, *type=RFC822FROM, p);
if(!stricmp(field, "ORGANIZATION"))
return smb_hfield_str(msg, *type=SENDERORG, p);
if(!stricmp(field, "DATE")) {
msg->hdr.when_written=rfc822date(p);
*type=UNKNOWN;
return(0);
}
if(!stricmp(field, "MESSAGE-ID"))
return smb_hfield_str(msg, *type=RFC822MSGID, p);
if(!stricmp(field, "IN-REPLY-TO"))
return smb_hfield_str(msg, *type=RFC822REPLYID, p);
/* Fall-through */
return smb_hfield_str(msg, *type=RFC822HEADER, buf);
}
static int chk_received_hdr(SOCKET socket,const char *buf,IN_ADDR *dnsbl_result, char *dnsbl, char *dnsbl_ip)
{
char host_name[128];
IN_ADDR check_addr;
char *fromstr;
char ip[16];
char *p;
char *p2;
fromstr=(char *)malloc(strlen(buf)+1);
if(fromstr==NULL)
return(0);
strcpy(fromstr,buf);
strlwr(fromstr);
do {
p=strstr(fromstr,"from ");
if(p==NULL)
break;
p+=4;
SKIP_WHITESPACE(p);
if(*p==0)
break;
p2=host_name;
for(;*p && !isspace(*p) && p2<host_name+126;p++) {
*p2++=*p;
}
*p2=0;
p=strtok(fromstr,"[");
if(p==NULL)
break;
p=strtok(NULL,"]");
if(p==NULL)
break;
strncpy(ip,p,16);
ip[15]=0;
check_addr.s_addr = inet_addr(ip);
if(startup->options&MAIL_OPT_DNSBL_DEBUG)
lprintf(LOG_DEBUG,"%04d DEBUG checking %s (%s)",socket,host_name,ip);
if((dnsbl_result->s_addr=dns_blacklisted(socket,check_addr,host_name,dnsbl,dnsbl_ip))!=0)
lprintf(LOG_WARNING,"%04d !SMTP BLACKLISTED SERVER on %s: %s [%s] = %s"
,socket, dnsbl, host_name, ip, inet_ntoa(*dnsbl_result));
} while(0);
free(fromstr);
return(dnsbl_result->s_addr);
}
static void parse_mail_address(char* p
,char* name, size_t name_len
,char* addr, size_t addr_len)
{
char* tp;
char tmp[128];
SKIP_WHITESPACE(p);
/* Get the address */
if((tp=strchr(p,'<'))!=NULL)
tp++;
else
tp=p;
SKIP_WHITESPACE(tp);
sprintf(addr,"%.*s",addr_len,tp);
truncstr(addr,">( ");
SAFECOPY(tmp,p);
p=tmp;
/* Get the "name" (if possible) */
if((tp=strchr(p,'('))!=NULL) { /* name in parenthesis? */
p=tp+1;
tp=strchr(p,')');
} else if((tp=strchr(p,'"'))!=NULL) { /* name in quotes? */
p=tp+1;
tp=strchr(p,'"');
} else if(*p=='<') { /* address in brackets? */
p++;
tp=strchr(p,'>');
} else /* name, then address in brackets */
tp=strchr(p,'<');
if(tp) *tp=0;
sprintf(name,"%.*s",name_len,p);
truncsp(name);
}
static void smtp_thread(void* arg)
{
int i,j;
int rd;
char str[512];
char tmp[128];
char value[INI_MAX_VALUE_LEN];
char** sec_list;
char* section;
char buf[1024],*p,*tp,*cp;
char hdrfield[512];
char alias_buf[128];
char name_alias_buf[128];
char reverse_path[128];
char date[64];
char qwkid[32];
char rcpt_name[128];
char rcpt_addr[128];
char sender[128];
char sender_addr[128];
char hello_name[128];
char user_name[LEN_ALIAS+1];
char user_pass[LEN_PASS+1];
char relay_list[MAX_PATH+1];
char domain_list[MAX_PATH+1];
char spam_bait[MAX_PATH+1];
char spam_block[MAX_PATH+1];
char host_name[128];
char host_ip[64];
char dnsbl[256];
char dnsbl_ip[64];
char* telegram_buf;
char* msgbuf;
char challenge[256];
char response[128];
char secret[64];
char md5_data[384];
char digest[MD5_DIGEST_SIZE];
char dest_host[128];
ushort dest_port;
socklen_t addr_len;
ushort hfield_type;
ushort nettype;
ushort agent;
uint usernum;
ulong lines=0;
ulong hdr_lines=0;
ulong hdr_len=0;
ulong length;
ulong badcmds=0;
BOOL esmtp=FALSE;
BOOL telegram=FALSE;
BOOL forward=FALSE;
BOOL no_forward=FALSE;
BOOL auth_login;
BOOL routed=FALSE;
BOOL dnsbl_recvhdr;
BOOL msg_handled;
uint subnum=INVALID_SUB;
FILE* msgtxt=NULL;
char msgtxt_fname[MAX_PATH+1];
FILE* rcptlst;
char rcptlst_fname[MAX_PATH+1];
ushort rcpt_count=0;
FILE* proc_err;
char proc_err_fname[MAX_PATH+1];
char session_id[MAX_PATH+1];
FILE* spy=NULL;
SOCKET socket;
HOSTENT* host;
int smb_error;
smb_t smb;
smbmsg_t msg;
smbmsg_t newmsg;
user_t user;
user_t relay_user;
node_t node;
client_t client;
smtp_t smtp=*(smtp_t*)arg;
SOCKADDR_IN server_addr;
IN_ADDR dnsbl_result;
BOOL* mailproc_match;
enum {
SMTP_STATE_INITIAL
,SMTP_STATE_HELO
,SMTP_STATE_MAIL_FROM
,SMTP_STATE_RCPT_TO
,SMTP_STATE_DATA_HEADER
,SMTP_STATE_DATA_BODY
} state = SMTP_STATE_INITIAL;
enum {
SMTP_CMD_NONE
,SMTP_CMD_MAIL
,SMTP_CMD_SEND
,SMTP_CMD_SOML
,SMTP_CMD_SAML
} cmd = SMTP_CMD_NONE;
thread_up(TRUE /* setuid */);
free(arg);
socket=smtp.socket;
lprintf(LOG_DEBUG,"%04d SMTP RX Session thread started", socket);
#ifdef _WIN32
if(startup->inbound_sound[0] && !(startup->options&MAIL_OPT_MUTE))
PlaySound(startup->inbound_sound, NULL, SND_ASYNC|SND_FILENAME);
#endif
addr_len=sizeof(server_addr);
if((i=getsockname(socket, (struct sockaddr *)&server_addr,&addr_len))!=0) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d (%d) getting address/port"
,socket, i, ERROR_VALUE);
sockprintf(socket,sys_error);
mail_close_socket(socket);
thread_down();
return;
}
if((mailproc_match=alloca(sizeof(BOOL)*mailproc_count))==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR allocating memory for mailproc_match", socket);
sockprintf(socket,sys_error);
mail_close_socket(socket);
thread_down();
return;
}
memset(mailproc_match,FALSE,sizeof(BOOL)*mailproc_count);
memset(&smb,0,sizeof(smb));
memset(&msg,0,sizeof(msg));
memset(&user,0,sizeof(user));
memset(&relay_user,0,sizeof(relay_user));
SAFECOPY(host_ip,inet_ntoa(smtp.client_addr.sin_addr));
lprintf(LOG_INFO,"%04d SMTP Connection accepted from: %s port %u"
, socket, host_ip, ntohs(smtp.client_addr.sin_port));
if(startup->options&MAIL_OPT_NO_HOST_LOOKUP)
host=NULL;
else
host=gethostbyaddr ((char *)&smtp.client_addr.sin_addr
,sizeof(smtp.client_addr.sin_addr),AF_INET);
if(host!=NULL && host->h_name!=NULL)
SAFECOPY(host_name,host->h_name);
else
strcpy(host_name,"<no name>");
if(!(startup->options&MAIL_OPT_NO_HOST_LOOKUP)) {
lprintf(LOG_INFO,"%04d SMTP Hostname: %s", socket, host_name);
for(i=0;host!=NULL && host->h_aliases!=NULL && host->h_aliases[i]!=NULL;i++)
lprintf(LOG_INFO,"%04d SMTP HostAlias: %s", socket, host->h_aliases[i]);
#if 0
if(host!=NULL) {
ip=resolve_ip(host_name);
if(ip!=smtp.client_addr.sin_addr.s_addr) {
smtp.client_addr.sin_addr.s_addr=ip;
lprintf(LOG_WARNING,"%04d !SMTP DNS/IP ADDRESS MISMATCH: %s vs %s"
,socket, inet_ntoa(smtp.client_addr.sin_addr), host_ip);
sockprintf(socket,"550 DNS and IP address mismatch");
mail_close_socket(socket);
thread_down();
return;
}
}
#endif
}
SAFECOPY(hello_name,host_name);
sprintf(spam_bait,"%sspambait.cfg",scfg.ctrl_dir);
sprintf(spam_block,"%sspamblock.cfg",scfg.ctrl_dir);
if(trashcan(&scfg,host_ip,"ip") || findstr(host_ip,spam_block)) {
lprintf(LOG_NOTICE,"%04d !SMTP BLOCKED SERVER IP ADDRESS: %s"
,socket, host_ip);
sockprintf(socket,"550 Access denied.");
mail_close_socket(socket);
thread_down();
return;
}
if(trashcan(&scfg,host_name,"host") || findstr(host_name,spam_block)) {
lprintf(LOG_NOTICE,"%04d !SMTP BLOCKED SERVER HOSTNAME: %s"
,socket, host_name);
sockprintf(socket,"550 Access denied.");
mail_close_socket(socket);
thread_down();
return;
}
active_clients++, update_clients();
/* SPAM Filters (mail-abuse.org) */
dnsbl_result.s_addr = dns_blacklisted(socket,smtp.client_addr.sin_addr,host_name,dnsbl,dnsbl_ip);
if(dnsbl_result.s_addr) {
lprintf(LOG_WARNING,"%04d !SMTP BLACKLISTED SERVER on %s: %s [%s] = %s"
,socket, dnsbl, host_name, dnsbl_ip, inet_ntoa(dnsbl_result));
if(startup->options&MAIL_OPT_DNSBL_REFUSE) {
SAFEPRINTF2(str,"Listed on %s as %s", dnsbl, inet_ntoa(dnsbl_result));
spamlog(&scfg, "SMTP", "SESSION REFUSED", str, host_name, dnsbl_ip, NULL, NULL);
sockprintf(socket
,"550 Mail from %s refused due to listing at %s"
,dnsbl_ip, dnsbl);
mail_close_socket(socket);
lprintf(LOG_WARNING,"%04d !SMTP REFUSED SESSION from blacklisted server"
,socket);
thread_down();
if(active_clients)
active_clients--, update_clients();
return;
}
}
sprintf(smb.file,"%smail",scfg.data_dir);
if(smb_islocked(&smb)) {
lprintf(LOG_WARNING,"%04d !SMTP MAIL BASE LOCKED: %s"
,socket, smb.last_error);
sockprintf(socket,sys_unavail);
mail_close_socket(socket);
thread_down();
if(active_clients)
active_clients--, update_clients();
return;
}
srand(time(NULL) ^ (DWORD)GetCurrentThreadId()); /* seed random number generator */
rand(); /* throw-away first result */
SAFEPRINTF3(session_id,"%x%x%lx",socket,rand(),clock());
SAFEPRINTF2(rcptlst_fname,"%sSBBS_SMTP.%s.lst", scfg.temp_dir, session_id);
rcptlst=fopen(rcptlst_fname,"w+");
if(rcptlst==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d creating recipient list: %s"
,socket, errno, rcptlst_fname);
sockprintf(socket,sys_error);
mail_close_socket(socket);
thread_down();
if(active_clients)
active_clients--, update_clients();
return;
}
if(trashcan(&scfg,host_name,"smtpspy")
|| trashcan(&scfg,host_ip,"smtpspy")) {
sprintf(str,"%ssmtpspy.txt", scfg.logs_dir);
spy=fopen(str,"a");
}
/* Initialize client display */
client.size=sizeof(client);
client.time=time(NULL);
SAFECOPY(client.addr,host_ip);
SAFECOPY(client.host,host_name);
client.port=ntohs(smtp.client_addr.sin_port);
client.protocol="SMTP";
client.user="<unknown>";
client_on(socket,&client,FALSE /* update */);
SAFEPRINTF(str,"SMTP: %s",host_ip);
status(str);
sockprintf(socket,"220 %s Synchronet SMTP Server %s-%s Ready"
,startup->host_name,revision,PLATFORM_DESC);
while(1) {
rd = sockreadline(socket, buf, sizeof(buf));
if(rd<0)
break;
truncsp(buf);
if(spy!=NULL)
fprintf(spy,"%s\n",buf);
if(relay_user.number==0 && dnsbl_result.s_addr && startup->options&MAIL_OPT_DNSBL_THROTTLE)
mswait(DNSBL_THROTTLE_VALUE);
if(state>=SMTP_STATE_DATA_HEADER) {
if(!strcmp(buf,".")) {
state=SMTP_STATE_HELO; /* RESET state machine here in case of error */
cmd=SMTP_CMD_NONE;
if(msgtxt==NULL) {
lprintf(LOG_ERR,"%04d !SMTP NO MESSAGE TEXT FILE POINTER?", socket);
sockprintf(socket,"554 No message text");
continue;
}
if(ftell(msgtxt)<1) {
lprintf(LOG_ERR,"%04d !SMTP INVALID MESSAGE LENGTH: %ld (%lu lines)"
, socket, ftell(msgtxt), lines);
sockprintf(socket,"554 No message text");
continue;
}
lprintf(LOG_INFO,"%04d SMTP End of message (body: %lu lines, %lu bytes, header: %lu lines, %lu bytes)"
, socket, lines, ftell(msgtxt)-hdr_len, hdr_lines, hdr_len);
if(telegram==TRUE) { /* Telegram */
const char* head="\1n\1h\1cInstant Message\1n from \1h\1y";
const char* tail="\1n:\r\n\1h";
rewind(msgtxt);
length=filelength(fileno(msgtxt));
p=strchr(sender_addr,'@');
if(p==NULL || resolve_ip(p+1)!=smtp.client_addr.sin_addr.s_addr)
/* Append real IP and hostname if different */
safe_snprintf(str,sizeof(str),"%s%s\r\n\1w[\1n%s\1h] (\1n%s\1h)%s"
,head,sender_addr,host_ip,host_name,tail);
else
safe_snprintf(str,sizeof(str),"%s%s%s",head,sender_addr,tail);
if((telegram_buf=(char*)malloc(length+strlen(str)+1))==NULL) {
lprintf(LOG_CRIT,"%04d !SMTP ERROR allocating %lu bytes of memory for telegram from %s"
,socket,length+strlen(str)+1,sender_addr);
sockprintf(socket, "452 Insufficient system storage");
continue;
}
strcpy(telegram_buf,str); /* can't use SAFECOPY here */
if(fread(telegram_buf+strlen(str),1,length,msgtxt)!=length) {
lprintf(LOG_ERR,"%04d !SMTP ERROR reading %lu bytes from telegram file"
,socket,length);
sockprintf(socket, "452 Insufficient system storage");
free(telegram_buf);
continue;
}
telegram_buf[length+strlen(str)]=0; /* Need ASCIIZ */
/* Send telegram to users */
sec_list=iniReadSectionList(rcptlst,NULL); /* Each section is a recipient */
for(rcpt_count=0; sec_list!=NULL
&& sec_list[rcpt_count]!=NULL
&& rcpt_count<startup->max_recipients; rcpt_count++) {
section=sec_list[rcpt_count];
SAFECOPY(rcpt_name,iniReadString(rcptlst,section ,smb_hfieldtype(RECIPIENT),"unknown",value));
usernum=iniReadInteger(rcptlst,section ,smb_hfieldtype(RECIPIENTEXT),0);
SAFECOPY(rcpt_addr,iniReadString(rcptlst,section ,smb_hfieldtype(RECIPIENTNETADDR),rcpt_name,value));
if((i=putsmsg(&scfg,usernum,telegram_buf))==0)
lprintf(LOG_INFO,"%04d SMTP Created telegram (%ld/%u bytes) from %s to %s <%s>"
,socket, length, strlen(telegram_buf), sender_addr, rcpt_name, rcpt_addr);
else
lprintf(LOG_ERR,"%04d !SMTP ERROR %d creating telegram from %s to %s <%s>"
,socket, i, sender_addr, rcpt_name, rcpt_addr);
}
iniFreeStringList(sec_list);
free(telegram_buf);
sockprintf(socket,ok_rsp);
telegram=FALSE;
continue;
}
fclose(msgtxt), msgtxt=NULL;
fclose(rcptlst), rcptlst=NULL;
/* External Mail Processing here */
msg_handled=FALSE;
if(mailproc_count) {
SAFEPRINTF2(proc_err_fname,"%sSBBS_SMTP.%s.err", scfg.temp_dir, session_id);
remove(proc_err_fname);
for(i=0;i<mailproc_count;i++) {
/* This processor is for specific recipients only and did not match */
if(strListCount(mailproc_list[i].to) && !mailproc_match[i])
continue;
if(!mailproc_list[i].passthru)
msg_handled=TRUE;
mailcmdstr(mailproc_list[i].cmdline
,msgtxt_fname, rcptlst_fname, proc_err_fname
,host_name, host_ip, relay_user.number
,sender, sender_addr, reverse_path, str);
lprintf(LOG_DEBUG,"%04d SMTP Executing external process: %s"
,socket, str);
if(mailproc_list[i].native) {
if((j=system(str))!=0)
lprintf(LOG_WARNING,"%04d !SMTP system(%s) returned %d (errno: %d)"
,socket, str, j, errno);
} else /* JavaScript */
js_mailproc(socket, &client, &relay_user, str /* cmdline */
,msgtxt_fname, rcptlst_fname, proc_err_fname
,sender, sender_addr, reverse_path);
if(flength(proc_err_fname)>0)
break;
if(!fexist(msgtxt_fname) || !fexist(rcptlst_fname))
break;
}
if(flength(proc_err_fname)>0
&& (proc_err=fopen(proc_err_fname,"r"))!=NULL) {
while(!feof(proc_err)) {
if(!fgets(str,sizeof(str),proc_err))
break;
truncsp(str);
lprintf(LOG_WARNING,"%04d !SMTP external process error: %s", socket, str);
i=atoi(str);
if(i>=100 && i<1000)
sockprintf(socket,"%s", str);
else
sockprintf(socket,"554%c%s"
,ftell(proc_err)<filelength(fileno(proc_err)) ? '-' : ' '
,str);
}
fclose(proc_err);
msg_handled=TRUE;
}
else if(!fexist(msgtxt_fname) || !fexist(rcptlst_fname)) {
lprintf(LOG_WARNING,"%04d SMTP External process removed %s file"
,socket, fexist(msgtxt_fname)==FALSE ? "message text" : "recipient list");
sockprintf(socket,ok_rsp);
msg_handled=TRUE;
}
else if(msg_handled)
sockprintf(socket,ok_rsp);
remove(proc_err_fname); /* Remove error file here */
}
/* Re-open files */
/* We must do this before continuing for handled msgs */
/* to prevent freopen(NULL) and orphaned temp files */
if((rcptlst=fopen(rcptlst_fname,fexist(rcptlst_fname) ? "r":"w+"))==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d re-opening recipient list: %s"
,socket, errno, rcptlst_fname);
if(!msg_handled)
sockprintf(socket,sys_error);
continue;
}
if(msg_handled) {
lprintf(LOG_NOTICE,"%04d SMTP Message handled by external mail processor"
,socket);
continue;
}
if((msgtxt=fopen(msgtxt_fname,"rb"))==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d re-opening message file: %s"
,socket, errno, msgtxt_fname);
sockprintf(socket,sys_error);
continue;
}
/* Initialize message header */
smb_freemsgmem(&msg);
memset(&msg,0,sizeof(smbmsg_t));
/* Parse message header here */
hfield_type=UNKNOWN;
smb_error=SMB_SUCCESS; /* no SMB error */
while(!feof(msgtxt)) {
if(!fgets(buf,sizeof(buf),msgtxt))
break;
truncsp(buf);
if(buf[0]==0) /* blank line marks end of header */
break;
if(!strnicmp(buf, "SUBJECT:",8)) {
p=buf+8;
SKIP_WHITESPACE(p);
if(relay_user.number==0 && dnsbl_result.s_addr && startup->dnsbl_tag[0]
&& !(startup->options&MAIL_OPT_DNSBL_IGNORE)) {
safe_snprintf(str,sizeof(str),"%.*s: %.*s"
,(int)sizeof(str)/2, startup->dnsbl_tag
,(int)sizeof(str)/2, p);
p=str;
lprintf(LOG_WARNING,"%04d !SMTP TAGGED MAIL SUBJECT from blacklisted server with: %s"
,socket, startup->dnsbl_tag);
}
smb_hfield_str(&msg, SUBJECT, p);
continue;
}
if(!strnicmp(buf, "FROM:", 5)
&& !chk_email_addr(socket,buf+5,host_name,host_ip,rcpt_addr,reverse_path))
break;
if((smb_error=parse_header_field(buf,&msg,&hfield_type))!=SMB_SUCCESS) {
if(smb_error==SMB_ERR_HDR_LEN)
lprintf(LOG_WARNING,"%04d !SMTP MESSAGE HEADER EXCEEDS %u BYTES"
,socket, SMB_MAX_HDR_LEN);
else
lprintf(LOG_ERR,"%04d !SMTP ERROR %d adding header field: %s"
,socket, smb_error, buf);
break;
}
}
if(smb_error!=SMB_SUCCESS) { /* SMB Error */
sockprintf(socket, "452 Insufficient system storage");
continue;
}
if((p=smb_get_hfield(&msg, RFC822TO, NULL))!=NULL) {
if(*p=='<') p++;
SAFECOPY(rcpt_name,p);
truncstr(rcpt_name,">");
}
if((p=smb_get_hfield(&msg, RFC822FROM, NULL))!=NULL) {
parse_mail_address(p
,sender ,sizeof(sender)-1
,sender_addr,sizeof(sender_addr)-1);
}
/* SPAM Filtering/Logging */
if(msg.subj!=NULL && trashcan(&scfg,msg.subj,"subject")) {
lprintf(LOG_WARNING,"%04d !SMTP BLOCKED SUBJECT (%s) from: %s"
,socket, msg.subj, reverse_path);
SAFEPRINTF2(tmp,"Blocked subject (%s) from: %s"
,msg.subj, reverse_path);
spamlog(&scfg, "SMTP", "REFUSED"
,tmp, host_name, host_ip, rcpt_addr, reverse_path);
sockprintf(socket, "554 Subject not allowed.");
continue;
}
dnsbl_recvhdr=FALSE;
if(startup->options&MAIL_OPT_DNSBL_CHKRECVHDRS) {
for(i=0;!dnsbl_result.s_addr && i<msg.total_hfields;i++) {
if(msg.hfield[i].type == RFC822HEADER
&& strnicmp(msg.hfield_dat[i],"Received:",9)==0) {
if(chk_received_hdr(socket,msg.hfield_dat[i],&dnsbl_result,dnsbl,dnsbl_ip)) {
dnsbl_recvhdr=TRUE;
break;
}
}
}
}
if(relay_user.number==0 && dnsbl_result.s_addr) {
if(startup->options&MAIL_OPT_DNSBL_IGNORE) {
lprintf(LOG_WARNING,"%04d !SMTP IGNORED MAIL from blacklisted server"
,socket);
SAFEPRINTF2(str,"Listed on %s as %s", dnsbl, inet_ntoa(dnsbl_result));
spamlog(&scfg, "SMTP", "IGNORED"
,str, host_name, dnsbl_ip, rcpt_addr, reverse_path);
/* pretend we received it */
sockprintf(socket,ok_rsp);
continue;
}
/* tag message as spam */
if(startup->dnsbl_hdr[0]) {
safe_snprintf(str,sizeof(str),"%s: %s is listed on %s as %s"
,startup->dnsbl_hdr, dnsbl_ip
,dnsbl, inet_ntoa(dnsbl_result));
smb_hfield_str(&msg, RFC822HEADER, str);
lprintf(LOG_WARNING,"%04d !SMTP TAGGED MAIL HEADER from blacklisted server with: %s"
,socket, startup->dnsbl_hdr);
}
if(startup->dnsbl_hdr[0] || startup->dnsbl_tag[0]) {
SAFEPRINTF2(str,"Listed on %s as %s", dnsbl, inet_ntoa(dnsbl_result));
spamlog(&scfg, "SMTP", "TAGGED", str, host_name, dnsbl_ip, rcpt_addr, reverse_path);
}
}
if(dnsbl_recvhdr) /* DNSBL-listed IP found in Received header? */
dnsbl_result.s_addr=0; /* Reset DNSBL look-up result between messages */
if(sender[0]==0) {
lprintf(LOG_WARNING,"%04d !SMTP MISSING mail header 'FROM' field", socket);
sockprintf(socket, "554 Mail header missing 'FROM' field");
subnum=INVALID_SUB;
continue;
}
nettype=NET_INTERNET;
smb_hfield_str(&msg, SMTPREVERSEPATH, reverse_path);
smb_hfield_str(&msg, SENDER, sender);
smb_hfield(&msg, SENDERNETTYPE, sizeof(nettype), &nettype);
smb_hfield_str(&msg, SENDERNETADDR, sender_addr);
if(msg.subj==NULL)
smb_hfield(&msg, SUBJECT, 0, NULL);
length=filelength(fileno(msgtxt))-ftell(msgtxt);
if(startup->max_msg_size && length>startup->max_msg_size) {
lprintf(LOG_WARNING,"%04d !SMTP message size (%lu) exceeds maximum: %lu bytes"
,socket,length,startup->max_msg_size);
sockprintf(socket, "552 Message size (%lu) exceeds maximum: %lu bytes"
,length,startup->max_msg_size);
subnum=INVALID_SUB;
continue;
}
if((msgbuf=(char*)malloc(length+1))==NULL) {
lprintf(LOG_CRIT,"%04d !SMTP ERROR allocating %d bytes of memory"
,socket,length+1);
sockprintf(socket, "452 Insufficient system storage");
subnum=INVALID_SUB;
continue;
}
fread(msgbuf,length,1,msgtxt);
msgbuf[length]=0; /* ASCIIZ */
/* Do external JavaScript processing here? */
if(subnum!=INVALID_SUB) { /* Message Base */
if(relay_user.number==0)
memset(&relay_user,0,sizeof(relay_user));
if(!chk_ar(&scfg,scfg.grp[scfg.sub[subnum]->grp]->ar, &relay_user)
|| !chk_ar(&scfg,scfg.sub[subnum]->ar, &relay_user)
|| !chk_ar(&scfg,scfg.sub[subnum]->post_ar, &relay_user)) {
lprintf(LOG_WARNING,"%04d !SMTP %s has insufficient access to post on %s"
,socket, sender_addr, scfg.sub[subnum]->sname);
sockprintf(socket,"550 Insufficient access");
subnum=INVALID_SUB;
continue;
}
if(rcpt_name[0]==0)
strcpy(rcpt_name,"All");
smb_hfield_str(&msg, RECIPIENT, rcpt_name);
smb.subnum=subnum;
if((i=savemsg(&scfg, &smb, &msg, &client, msgbuf))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"%04d !SMTP ERROR %d (%s) saving message"
,socket,i,smb.last_error);
sockprintf(socket, "452 ERROR %d (%s) saving message"
,i,smb.last_error);
} else {
lprintf(LOG_INFO,"%04d SMTP %s posted a message on %s"
,socket, sender_addr, scfg.sub[subnum]->sname);
sockprintf(socket,ok_rsp);
signal_smtp_sem();
}
free(msgbuf);
smb_close(&smb);
subnum=INVALID_SUB;
continue;
}
/* E-mail */
smb.subnum=INVALID_SUB;
i=savemsg(&scfg, &smb, &msg, &client, msgbuf);
free(msgbuf);
if(i!=SMB_SUCCESS) {
smb_close(&smb);
lprintf(LOG_ERR,"%04d !SMTP ERROR %d (%s) saving message"
,socket,i,smb.last_error);
sockprintf(socket, "452 ERROR %d (%s) saving message"
,i,smb.last_error);
continue;
}
sec_list=iniReadSectionList(rcptlst,NULL); /* Each section is a recipient */
for(rcpt_count=0; sec_list!=NULL
&& sec_list[rcpt_count]!=NULL
&& rcpt_count<startup->max_recipients; rcpt_count++) {
section=sec_list[rcpt_count];
SAFECOPY(rcpt_name,iniReadString(rcptlst,section ,smb_hfieldtype(RECIPIENT),"unknown",value));
usernum=iniReadInteger(rcptlst,section ,smb_hfieldtype(RECIPIENTEXT),0);
agent=iniReadShortInt(rcptlst,section ,smb_hfieldtype(RECIPIENTAGENT),AGENT_PERSON);
nettype=iniReadShortInt(rcptlst,section ,smb_hfieldtype(RECIPIENTNETTYPE),NET_NONE);
sprintf(str,"#%u",usernum);
SAFECOPY(rcpt_addr,iniReadString(rcptlst,section ,smb_hfieldtype(RECIPIENTNETADDR),str,value));
if(nettype==NET_NONE /* Local destination */ && usernum==0) {
lprintf(LOG_ERR,"%04d !SMTP can't deliver mail to user #0"
,socket);
break;
}
if((i=smb_copymsgmem(&smb,&newmsg,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d (%s) copying message"
,socket, i, smb.last_error);
break;
}
snprintf(hdrfield,sizeof(hdrfield),
"Received: from %s (%s [%s])\r\n"
" by %s [%s] (Synchronet Mail Server %s-%s) with %s\r\n"
" for %s; %s"
,host_name,hello_name,host_ip
,startup->host_name,inet_ntoa(server_addr.sin_addr)
,revision,PLATFORM_DESC
,esmtp ? "ESMTP" : "SMTP"
,rcpt_name,msgdate(msg.hdr.when_imported,date));
smb_hfield_str(&newmsg, RFC822HEADER, hdrfield);
smb_hfield_str(&newmsg, RECIPIENT, rcpt_name);
if(usernum) { /* Local destination or QWKnet routed */
/* This is required for fixsmb to be able to rebuild the index */
sprintf(str,"%u",usernum);
smb_hfield_str(&newmsg, RECIPIENTEXT, str);
}
if(nettype!=NET_NONE) {
smb_hfield(&newmsg, RECIPIENTNETTYPE, sizeof(nettype), &nettype);
smb_hfield_str(&newmsg, RECIPIENTNETADDR, rcpt_addr);
}
if(agent!=newmsg.to_agent)
smb_hfield(&newmsg, RECIPIENTAGENT, sizeof(agent), &agent);
i=smb_addmsghdr(&smb,&newmsg,SMB_SELFPACK);
smb_freemsgmem(&newmsg);
if(i!=SMB_SUCCESS) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d (%s) adding message header"
,socket, i, smb.last_error);
break;
}
lprintf(LOG_INFO,"%04d SMTP Created message #%ld from %s to %s <%s>"
,socket, newmsg.hdr.number, sender, rcpt_name, rcpt_addr);
if(!(startup->options&MAIL_OPT_NO_NOTIFY) && usernum) {
safe_snprintf(str,sizeof(str)
,"\7\1n\1hOn %.24s\r\n\1m%s \1n\1msent you e-mail from: "
"\1h%s\1n\r\n"
,timestr(&scfg,(time_t*)&newmsg.hdr.when_imported.time,tmp)
,sender,sender_addr);
if(!newmsg.idx.to) { /* Forwarding */
strcat(str,"\1mand it was automatically forwaded to: \1h");
strcat(str,user.netmail);
strcat(str,"\1n\r\n");
}
putsmsg(&scfg, usernum, str);
}
}
iniFreeStringList(sec_list);
if(rcpt_count<1) {
smb_freemsg_dfields(&smb,&msg,SMB_ALL_REFS);
sockprintf(socket, "452 Insufficient system storage");
}
else {
if(rcpt_count>1)
smb_incmsg_dfields(&smb,&msg,(ushort)(rcpt_count-1));
sockprintf(socket,ok_rsp);
signal_smtp_sem();
}
#if 0 /* This shouldn't be necessary here */
smb_close_da(&smb);
#endif
smb_close(&smb);
continue;
}
if(buf[0]==0 && state==SMTP_STATE_DATA_HEADER) {
state=SMTP_STATE_DATA_BODY; /* Null line separates header and body */
lines=0;
if(msgtxt!=NULL) {
fprintf(msgtxt, "\r\n");
hdr_len=ftell(msgtxt);
}
continue;
}
if(state==SMTP_STATE_DATA_BODY) {
p=buf;
if(*p=='.') p++; /* Transparency (RFC821 4.5.2) */
if(msgtxt!=NULL)
fprintf(msgtxt, "%s\r\n", p);
lines++;
/* release time-slices every x lines */
if(startup->lines_per_yield &&
!(lines%startup->lines_per_yield))
YIELD();
continue;
}
/* RFC822 Header parsing */
if(startup->options&MAIL_OPT_DEBUG_RX_HEADER)
lprintf(LOG_DEBUG,"%04d SMTP %s",socket, buf);
if(!strnicmp(buf, "FROM:", 5))
parse_mail_address(buf+5
,sender, sizeof(sender)-1
,sender_addr, sizeof(sender_addr)-1);
if(msgtxt!=NULL)
fprintf(msgtxt, "%s\r\n", buf);
hdr_lines++;
continue;
}
strip_ctrl(buf);
lprintf(LOG_DEBUG,"%04d SMTP RX: %s", socket, buf);
if(!strnicmp(buf,"HELO",4)) {
p=buf+4;
SKIP_WHITESPACE(p);
SAFECOPY(hello_name,p);
sockprintf(socket,"250 %s",startup->host_name);
esmtp=FALSE;
state=SMTP_STATE_HELO;
cmd=SMTP_CMD_NONE;
telegram=FALSE;
subnum=INVALID_SUB;
continue;
}
if(!strnicmp(buf,"EHLO",4)) {
p=buf+4;
SKIP_WHITESPACE(p);
SAFECOPY(hello_name,p);
sockprintf(socket,"250-%s",startup->host_name);
sockprintf(socket,"250 AUTH PLAIN LOGIN CRAM-MD5");
esmtp=TRUE;
state=SMTP_STATE_HELO;
cmd=SMTP_CMD_NONE;
telegram=FALSE;
subnum=INVALID_SUB;
continue;
}
if((auth_login=(stricmp(buf,"AUTH LOGIN")==0))==TRUE
|| stricmp(buf,"AUTH PLAIN")==0) {
if(auth_login)
sockprintf(socket,"334 VXNlcm5hbWU6"); /* Base64-encoded "Username:" */
else
sockprintf(socket,"334 Username:");
if((rd=sockreadline(socket, buf, sizeof(buf)))<1) {
sockprintf(socket,badarg_rsp);
continue;
}
if(startup->options&MAIL_OPT_DEBUG_RX_RSP)
lprintf(LOG_DEBUG,"%04d RX: %s",socket,buf);
if(auth_login) {
if(b64_decode(user_name,sizeof(user_name),buf,rd)<1) {
sockprintf(socket,badarg_rsp);
continue;
}
} else
SAFECOPY(user_name,buf);
if(auth_login)
sockprintf(socket,"334 UGFzc3dvcmQ6"); /* Base64-encoded "Password:" */
else
sockprintf(socket,"334 Password:");
if((rd=sockreadline(socket, buf, sizeof(buf)))<1) {
sockprintf(socket,badarg_rsp);
continue;
}
if(startup->options&MAIL_OPT_DEBUG_RX_RSP)
lprintf(LOG_DEBUG,"%04d RX: %s",socket,buf);
if(auth_login) {
if(b64_decode(user_pass,sizeof(user_pass),buf,rd)<1) {
sockprintf(socket,badarg_rsp);
continue;
}
} else
SAFECOPY(user_pass,buf);
if((relay_user.number=matchuser(&scfg,user_name,FALSE))==0) {
if(scfg.sys_misc&SM_ECHO_PW)
lprintf(LOG_WARNING,"%04d !SMTP UNKNOWN USER: %s (password: %s)"
,socket, user_name, user_pass);
else
lprintf(LOG_WARNING,"%04d !SMTP UNKNOWN USER: %s"
,socket, user_name);
sockprintf(socket,badauth_rsp);
continue;
}
if((i=getuserdat(&scfg, &relay_user))!=0) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d getting data on user (%s)"
,socket, i, user_name);
sockprintf(socket,badauth_rsp);
relay_user.number=0;
continue;
}
if(relay_user.misc&(DELETED|INACTIVE)) {
lprintf(LOG_WARNING,"%04d !SMTP DELETED or INACTIVE user #%u (%s)"
,socket, relay_user.number, user_name);
sockprintf(socket,badauth_rsp);
relay_user.number=0;
break;
}
if(stricmp(user_pass,relay_user.pass)) {
if(scfg.sys_misc&SM_ECHO_PW)
lprintf(LOG_WARNING,"%04d !SMTP FAILED Password attempt for user %s: '%s' expected '%s'"
,socket, user_name, user_pass, relay_user.pass);
else
lprintf(LOG_WARNING,"%04d !SMTP FAILED Password attempt for user %s"
,socket, user_name);
sockprintf(socket,badauth_rsp);
relay_user.number=0;
break;
}
/* Update client display */
client.user=relay_user.alias;
client_on(socket,&client,TRUE /* update */);
lprintf(LOG_INFO,"%04d SMTP %s authenticated using %s authentication"
,socket,relay_user.alias,auth_login ? "LOGIN" : "PLAIN");
sockprintf(socket,auth_ok);
continue;
}
if(!stricmp(buf,"AUTH CRAM-MD5")) {
safe_snprintf(challenge,sizeof(challenge),"<%x%x%lx%lx@%s>"
,rand(),socket,(ulong)time(NULL),clock(),startup->host_name);
#if 0
lprintf(LOG_DEBUG,"%04d SMTP CRAM-MD5 challenge: %s"
,socket,challenge);
#endif
b64_encode(str,sizeof(str),challenge,0);
sockprintf(socket,"334 %s",str);
if((rd=sockreadline(socket, buf, sizeof(buf)))<1) {
sockprintf(socket,badarg_rsp);
continue;
}
if(startup->options&MAIL_OPT_DEBUG_RX_RSP)
lprintf(LOG_DEBUG,"%04d RX: %s",socket,buf);
if(b64_decode(response,sizeof(response),buf,rd)<1) {
sockprintf(socket,badarg_rsp);
continue;
}
#if 0
lprintf(LOG_DEBUG,"%04d SMTP CRAM-MD5 response: %s"
,socket,response);
#endif
if((p=strrchr(response,' '))!=NULL)
*(p++)=0;
else
p=response;
SAFECOPY(user_name,response);
if((relay_user.number=matchuser(&scfg,user_name,FALSE))==0) {
lprintf(LOG_WARNING,"%04d !SMTP UNKNOWN USER: %s"
,socket, user_name);
sockprintf(socket,badauth_rsp);
continue;
}
if((i=getuserdat(&scfg, &relay_user))!=0) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d getting data on user (%s)"
,socket, i, user_name);
sockprintf(socket,badauth_rsp);
relay_user.number=0;
continue;
}
if(relay_user.misc&(DELETED|INACTIVE)) {
lprintf(LOG_WARNING,"%04d !SMTP DELETED or INACTIVE user #%u (%s)"
,socket, relay_user.number, user_name);
sockprintf(socket,badauth_rsp);
relay_user.number=0;
continue;
}
/* Calculate correct response */
memset(secret,0,sizeof(secret));
SAFECOPY(secret,relay_user.pass);
strlwr(secret); /* this is case sensitive, so convert to lowercase first */
for(i=0;i<sizeof(secret);i++)
md5_data[i]=secret[i]^0x36; /* ipad */
strcpy(md5_data+i,challenge);
MD5_calc(digest,md5_data,sizeof(secret)+strlen(challenge));
for(i=0;i<sizeof(secret);i++)
md5_data[i]=secret[i]^0x5c; /* opad */
memcpy(md5_data+i,digest,sizeof(digest));
MD5_calc(digest,md5_data,sizeof(secret)+sizeof(digest));
MD5_hex(str,digest);
if(strcmp(p,str)) {
lprintf(LOG_WARNING,"%04d !SMTP %s FAILED CRAM-MD5 authentication"
,socket,relay_user.alias);
#if 0
lprintf(LOG_DEBUG,"%04d !SMTP calc digest: %s"
,socket,str);
lprintf(LOG_DEBUG,"%04d !SMTP resp digest: %s"
,socket,p);
#endif
sockprintf(socket,badauth_rsp);
relay_user.number=0;
continue;
}
/* Update client display */
client.user=relay_user.alias;
client_on(socket,&client,TRUE /* update */);
lprintf(LOG_INFO,"%04d SMTP %s authenticated using CRAM-MD5 authentication"
,socket,relay_user.alias);
sockprintf(socket,auth_ok);
continue;
}
if(!strnicmp(buf,"AUTH",4)) {
sockprintf(socket,"504 Unrecognized authentication type.");
continue;
}
if(!stricmp(buf,"QUIT")) {
sockprintf(socket,"221 %s Service closing transmission channel",startup->host_name);
break;
}
if(!stricmp(buf,"NOOP")) {
sockprintf(socket, ok_rsp);
badcmds=0;
continue;
}
if(state<SMTP_STATE_HELO) {
/* RFC 821 4.1.1 "The first command in a session must be the HELO command." */
lprintf(LOG_WARNING,"%04d !SMTP MISSING 'HELO' command",socket);
sockprintf(socket, badseq_rsp);
continue;
}
if(!stricmp(buf,"TURN")) {
sockprintf(socket,"502 command not supported");
badcmds=0;
continue;
}
if(!stricmp(buf,"RSET")) {
smb_freemsgmem(&msg);
memset(&msg,0,sizeof(smbmsg_t)); /* Initialize message header */
reverse_path[0]=0;
state=SMTP_STATE_HELO;
cmd=SMTP_CMD_NONE;
telegram=FALSE;
subnum=INVALID_SUB;
/* reset recipient list */
if((rcptlst=freopen(rcptlst_fname,"w+",rcptlst))==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d re-opening %s"
,socket, errno, rcptlst_fname);
sockprintf(socket,sys_error);
break;
}
rcpt_count=0;
sockprintf(socket,ok_rsp);
badcmds=0;
lprintf(LOG_INFO,"%04d SMTP Session reset",socket);
continue;
}
if(!strnicmp(buf,"MAIL FROM:",10)
|| !strnicmp(buf,"SEND FROM:",10) /* Send a Message (Telegram) to a local ONLINE user */
|| !strnicmp(buf,"SOML FROM:",10) /* Send OR Mail a Message to a local user */
|| !strnicmp(buf,"SAML FROM:",10) /* Send AND Mail a Message to a local user */
) {
p=buf+10;
if(!chk_email_addr(socket,p,host_name,host_ip,NULL,NULL))
break;
SKIP_WHITESPACE(p);
SAFECOPY(reverse_path,p);
/* Update client display */
if(relay_user.number==0) {
client.user=reverse_path;
client_on(socket,&client,TRUE /* update */);
}
/* Setup state */
state=SMTP_STATE_MAIL_FROM;
if(!strnicmp(buf,"MAIL FROM:",10))
cmd=SMTP_CMD_MAIL;
else if(!strnicmp(buf,"SEND FROM:",10))
cmd=SMTP_CMD_SEND;
else if(!strnicmp(buf,"SOML FROM:",10))
cmd=SMTP_CMD_SOML;
else if(!strnicmp(buf,"SAML FROM:",10))
cmd=SMTP_CMD_SAML;
/* reset recipient list */
if((rcptlst=freopen(rcptlst_fname,"w+",rcptlst))==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d re-opening %s"
,socket, errno, rcptlst_fname);
sockprintf(socket,sys_error);
break;
}
rcpt_count=0;
sockprintf(socket,ok_rsp);
badcmds=0;
continue;
}
#if 0 /* No one uses this command */
if(!strnicmp(buf,"VRFY",4)) {
p=buf+4;
SKIP_WHITESPACE(p);
if(*p==0) {
sockprintf(socket,"550 No user specified.");
continue;
}
#endif
/* Add to Recipient list */
if(!strnicmp(buf,"RCPT TO:",8)) {
if(state<SMTP_STATE_MAIL_FROM) {
lprintf(LOG_WARNING,"%04d !SMTP MISSING 'MAIL' command",socket);
sockprintf(socket, badseq_rsp);
continue;
}
if(spy==NULL && trashcan(&scfg,reverse_path,"smtpspy")) {
sprintf(str,"%ssmtpspy.txt", scfg.logs_dir);
spy=fopen(str,"a");
}
p=buf+8;
SKIP_WHITESPACE(p);
SAFECOPY(str,p);
p=strrchr(str,'<');
if(p==NULL)
p=str;
else
p++;
truncstr(str,">"); /* was truncating at space too */
routed=FALSE;
forward=FALSE;
no_forward=FALSE;
if(!strnicmp(p,FORWARD,strlen(FORWARD))) {
forward=TRUE; /* force forward to user's netmail address */
p+=strlen(FORWARD);
}
if(!strnicmp(p,NO_FORWARD,strlen(NO_FORWARD))) {
no_forward=TRUE; /* do not forward to user's netmail address */
p+=strlen(NO_FORWARD);
}
if(*p==0) {
lprintf(LOG_WARNING,"%04d !SMTP NO RECIPIENT SPECIFIED"
,socket);
sockprintf(socket, "500 No recipient specified");
continue;
}
rcpt_name[0]=0;
SAFECOPY(rcpt_addr,p);
/* Check recipient counter */
if(rcpt_count>=startup->max_recipients) {
lprintf(LOG_WARNING,"%04d !SMTP MAXIMUM RECIPIENTS (%d) REACHED"
,socket, startup->max_recipients);
sprintf(tmp,"Maximum recipient count (%d)",startup->max_recipients);
spamlog(&scfg, "SMTP", "REFUSED", tmp
,host_name, host_ip, rcpt_addr, reverse_path);
sockprintf(socket, "552 Too many recipients");
continue;
}
/* Check for SPAM bait recipient */
if(findstr(rcpt_addr,spam_bait)) {
SAFEPRINTF(str,"SPAM BAIT (%s) taken", rcpt_addr);
lprintf(LOG_WARNING,"%04d !SMTP %s by: %s"
,socket, str, reverse_path);
strcpy(tmp,"REFUSED");
if(dnsbl_result.s_addr==0) { /* Don't double-filter */
lprintf(LOG_WARNING,"%04d !BLOCKING IP ADDRESS: %s in %s", socket, host_ip, spam_block);
filter_ip(&scfg, "SMTP", str, host_name, host_ip, reverse_path, spam_block);
strcat(tmp," and BLOCKED");
}
spamlog(&scfg, "SMTP", tmp, "Attempted recipient in SPAM BAIT list"
,host_name, host_ip, rcpt_addr, reverse_path);
break;
}
/* Check for blocked recipients */
if(trashcan(&scfg,rcpt_addr,"email")) {
lprintf(LOG_NOTICE,"%04d !SMTP BLOCKED RECIPIENT (%s) from: %s"
,socket, rcpt_addr, reverse_path);
spamlog(&scfg, "SMTP", "REFUSED", "Blocked recipient e-mail address"
,host_name, host_ip, rcpt_addr, reverse_path);
sockprintf(socket, "550 Unknown User:%s", buf+8);
continue;
}
if(relay_user.number==0 && dnsbl_result.s_addr && startup->options&MAIL_OPT_DNSBL_BADUSER) {
lprintf(LOG_WARNING,"%04d !SMTP REFUSED MAIL from blacklisted server"
,socket);
SAFEPRINTF2(str,"Listed on %s as %s", dnsbl, inet_ntoa(dnsbl_result));
spamlog(&scfg, "SMTP", "REFUSED", str, host_name, host_ip, rcpt_addr, reverse_path);
sockprintf(socket
,"550 Mail from %s refused due to listing at %s"
,host_ip, dnsbl);
continue;
}
/* Check for full address aliases */
p=alias(&scfg,p,alias_buf);
if(p==alias_buf)
lprintf(LOG_INFO,"%04d SMTP ADDRESS ALIAS: %s",socket,p);
tp=strrchr(p,'@');
if(cmd==SMTP_CMD_MAIL && tp!=NULL) {
/* RELAY */
dest_port=server_addr.sin_port;
SAFECOPY(dest_host,tp+1);
cp=strrchr(dest_host,':');
if(cp!=NULL) {
*cp=0;
dest_port=atoi(cp+1);
}
sprintf(domain_list,"%sdomains.cfg",scfg.ctrl_dir);
if((stricmp(dest_host,scfg.sys_inetaddr)!=0
&& stricmp(dest_host,startup->host_name)!=0
&& resolve_ip(dest_host)!=server_addr.sin_addr.s_addr
&& findstr(dest_host,domain_list)==FALSE)
|| dest_port!=server_addr.sin_port) {
sprintf(relay_list,"%srelay.cfg",scfg.ctrl_dir);
if(relay_user.number==0 /* not authenticated, search for IP */
&& startup->options&MAIL_OPT_SMTP_AUTH_VIA_IP) {
relay_user.number=userdatdupe(&scfg, 0, U_NOTE, LEN_NOTE, host_ip, FALSE);
if(relay_user.number) {
getuserdat(&scfg,&relay_user);
if(relay_user.laston < time(NULL)-(60*60)) /* logon in past hour? */
relay_user.number=0;
}
} else
getuserdat(&scfg,&relay_user);
if(p!=alias_buf /* forced relay by alias */ &&
(!(startup->options&MAIL_OPT_ALLOW_RELAY)
|| relay_user.number==0
|| relay_user.rest&(FLAG('G')|FLAG('M'))) &&
!findstr(host_name,relay_list) &&
!findstr(host_ip,relay_list)) {
lprintf(LOG_WARNING,"%04d !SMTP ILLEGAL RELAY ATTEMPT from %s [%s] to %s"
,socket, reverse_path, host_ip, p);
SAFEPRINTF(tmp,"Relay attempt to: %s", p);
spamlog(&scfg, "SMTP", "REFUSED", tmp, host_name, host_ip, rcpt_addr, reverse_path);
if(startup->options&MAIL_OPT_ALLOW_RELAY)
sockprintf(socket, "553 Relaying through this server "
"requires authentication. "
"Please authenticate before sending.");
else
sockprintf(socket, "550 Relay not allowed.");
break;
}
if(relay_user.number==0)
SAFECOPY(relay_user.alias,"Unknown User");
lprintf(LOG_INFO,"%04d SMTP %s relaying to external mail service: %s"
,socket, relay_user.alias, tp+1);
fprintf(rcptlst,"[%u]\n",rcpt_count++);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENT),rcpt_addr);
fprintf(rcptlst,"%s=%u\n",smb_hfieldtype(RECIPIENTNETTYPE),NET_INTERNET);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENTNETADDR),p);
sockprintf(socket,ok_rsp);
state=SMTP_STATE_RCPT_TO;
continue;
}
}
if(tp!=NULL)
*tp=0; /* truncate at '@' */
tp=strchr(p,'!'); /* Routed QWKnet mail in <qwkid!user@host> format */
if(tp!=NULL) {
*(tp++)=0;
SKIP_CHAR(tp,'"'); /* Skip '"' */
truncstr(tp,"\""); /* Strip '"' */
SAFECOPY(rcpt_addr,tp);
routed=TRUE;
}
FIND_ALPHANUMERIC(p); /* Skip '<' or '"' */
truncstr(p,"\"");
p=alias(&scfg,p,name_alias_buf);
if(p==name_alias_buf)
lprintf(LOG_INFO,"%04d SMTP NAME ALIAS: %s",socket,p);
if(!strnicmp(p,"sub:",4)) { /* Post on a sub-board */
p+=4;
for(i=0;i<scfg.total_subs;i++)
if(!stricmp(p,scfg.sub[i]->code))
break;
if(i>=scfg.total_subs) {
lprintf(LOG_WARNING,"%04d !SMTP UNKNOWN SUB-BOARD: %s", socket, p);
sockprintf(socket, "550 Unknown sub-board: %s", p);
continue;
}
subnum=i;
sockprintf(socket,ok_rsp);
state=SMTP_STATE_RCPT_TO;
rcpt_count++;
continue;
}
memset(mailproc_match,FALSE,sizeof(BOOL)*mailproc_count);
for(i=0;i<mailproc_count;i++) {
if(mailproc_list[i].to!=NULL) {
for(j=0;mailproc_list[i].to[j]!=NULL;j++) {
if(stricmp(p,mailproc_list[i].to[j])==0) {
mailproc_match[i]=TRUE;
if(!mailproc_list[i].passthru)
break;
}
}
if(mailproc_list[i].to[j]!=NULL)
break;
}
}
/* destined for an external mail processor */
if(i<mailproc_count) {
fprintf(rcptlst,"[%u]\n",rcpt_count++);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENT),rcpt_addr);
#if 0 /* should we fall-through to the sysop account? */
fprintf(rcptlst,"%s=%u\n",smb_hfieldtype(RECIPIENTEXT),1);
#endif
lprintf(LOG_INFO,"%04d SMTP Routing mail for %s to External Mail Processor: %s"
,socket, rcpt_addr, mailproc_list[i].cmdline);
sockprintf(socket,ok_rsp);
state=SMTP_STATE_RCPT_TO;
continue;
}
usernum=0; /* unknown user at this point */
if(routed) {
SAFECOPY(qwkid,p);
truncstr(qwkid,"/");
/* Search QWKnet hub-IDs for route destination */
for(i=0;i<scfg.total_qhubs;i++) {
if(!stricmp(qwkid,scfg.qhub[i]->id))
break;
}
if(i<scfg.total_qhubs) { /* found matching QWKnet Hub */
lprintf(LOG_INFO,"%04d SMTP Routing mail for %s <%s> to QWKnet Hub: %s"
,socket, rcpt_addr, p, scfg.qhub[i]->id);
fprintf(rcptlst,"[%u]\n",rcpt_count++);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENT),rcpt_addr);
fprintf(rcptlst,"%s=%u\n",smb_hfieldtype(RECIPIENTNETTYPE),NET_QWK);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENTNETADDR),p);
sockprintf(socket,ok_rsp);
state=SMTP_STATE_RCPT_TO;
continue;
}
}
if(startup->options&MAIL_OPT_ALLOW_RX_BY_NUMBER
&& isdigit(*p)) {
usernum=atoi(p); /* RX by user number */
/* verify usernum */
username(&scfg,usernum,str);
if(!str[0] || !stricmp(str,"DELETED USER"))
usernum=0;
p=str;
} else {
/* RX by "user alias", "user.alias" or "user_alias" */
usernum=matchuser(&scfg,p,TRUE /* sysop_alias */);
if(!usernum) { /* RX by "real name", "real.name", or "sysop.alias" */
/* convert "user.name" to "user name" */
SAFECOPY(rcpt_name,p);
for(tp=rcpt_name;*tp;tp++)
if(*tp=='.') *tp=' ';
if(!stricmp(p,scfg.sys_op) || !stricmp(rcpt_name,scfg.sys_op))
usernum=1; /* RX by "sysop.alias" */
if(!usernum && scfg.msg_misc&MM_REALNAME) /* RX by "real name" */
usernum=userdatdupe(&scfg, 0, U_NAME, LEN_NAME, p, FALSE);
if(!usernum && scfg.msg_misc&MM_REALNAME) /* RX by "real.name" */
usernum=userdatdupe(&scfg, 0, U_NAME, LEN_NAME, rcpt_name, FALSE);
}
}
if(!usernum && startup->default_user[0]) {
usernum=matchuser(&scfg,startup->default_user,TRUE /* sysop_alias */);
if(usernum)
lprintf(LOG_INFO,"%04d SMTP Forwarding mail for UNKNOWN USER to default user: %s"
,socket,startup->default_user);
else
lprintf(LOG_WARNING,"%04d !SMTP UNKNOWN DEFAULT USER: %s"
,socket,startup->default_user);
}
if(!usernum) {
lprintf(LOG_WARNING,"%04d !SMTP UNKNOWN USER:%s", socket, buf+8);
sockprintf(socket, "550 Unknown User:%s", buf+8);
continue;
}
user.number=usernum;
if((i=getuserdat(&scfg, &user))!=0) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d getting data on user #%u (%s)"
,socket, i, usernum, p);
sockprintf(socket, "550 Unknown User:%s", buf+8);
continue;
}
if(user.misc&(DELETED|INACTIVE)) {
lprintf(LOG_WARNING,"%04d !SMTP DELETED or INACTIVE user #%u (%s)"
,socket, usernum, p);
sockprintf(socket, "550 Unknown User:%s", buf+8);
continue;
}
if(cmd==SMTP_CMD_SEND) { /* Check if user online */
for(i=0;i<scfg.sys_nodes;i++) {
getnodedat(&scfg, i+1, &node, 0);
if(node.status==NODE_INUSE && node.useron==user.number
&& !(node.misc&NODE_POFF))
break;
}
if(i>=scfg.sys_nodes) {
lprintf(LOG_WARNING,"%04d !Attempt to send telegram to unavailable user #%u (%s)"
,socket, user.number, user.alias);
sockprintf(socket,"450 User unavailable");
continue;
}
}
if(cmd==SMTP_CMD_MAIL) {
#if 0 /* implement later */
if(useron.etoday>=cfg.level_emailperday[useron.level]
&& !(useron.rest&FLAG('Q'))) {
bputs(text[TooManyEmailsToday]);
continue;
}
#endif
} else
telegram=TRUE;
fprintf(rcptlst,"[%u]\n",rcpt_count++);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENT),rcpt_addr);
fprintf(rcptlst,"%s=%u\n",smb_hfieldtype(RECIPIENTEXT),user.number);
/* Forward to Internet */
tp=strrchr(user.netmail,'@');
if(!telegram
&& !routed
&& !no_forward
&& scfg.sys_misc&SM_FWDTONET
&& (user.misc&NETMAIL || forward)
&& tp!=NULL && smb_netaddr_type(user.netmail)==NET_INTERNET
&& !strstr(tp,scfg.sys_inetaddr)) {
lprintf(LOG_INFO,"%04d SMTP Forwarding to: %s"
,socket, user.netmail);
fprintf(rcptlst,"%s=%u\n",smb_hfieldtype(RECIPIENTNETTYPE),NET_INTERNET);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENTNETADDR),user.netmail);
sockprintf(socket,"251 User not local; will forward to %s", user.netmail);
} else { /* Local (no-forward) */
if(routed) { /* QWKnet */
fprintf(rcptlst,"%s=%u\n",smb_hfieldtype(RECIPIENTNETTYPE),NET_QWK);
fprintf(rcptlst,"%s=%s\n",smb_hfieldtype(RECIPIENTNETADDR),user.alias);
}
sockprintf(socket,ok_rsp);
}
state=SMTP_STATE_RCPT_TO;
continue;
}
/* Message Data (header and body) */
if(!strnicmp(buf,"DATA",4)) {
if(state<SMTP_STATE_RCPT_TO) {
lprintf(LOG_WARNING,"%04d !SMTP MISSING 'RCPT TO' command", socket);
sockprintf(socket, badseq_rsp);
continue;
}
if(msgtxt!=NULL) {
fclose(msgtxt), msgtxt=NULL;
if(!(startup->options&MAIL_OPT_DEBUG_RX_BODY))
unlink(msgtxt_fname);
}
SAFEPRINTF2(msgtxt_fname,"%sSBBS_SMTP.%s.msg", scfg.temp_dir, session_id);
if((msgtxt=fopen(msgtxt_fname,"w+b"))==NULL) {
lprintf(LOG_ERR,"%04d !SMTP ERROR %d opening %s"
,socket, errno, msgtxt_fname);
sockprintf(socket, "452 Insufficient system storage");
continue;
}
/* These vars are potentially over-written by parsing an RFC822 header */
/* get sender_addr */
p=strchr(reverse_path,'<');
if(p==NULL)
p=reverse_path;
else
p++;
SAFECOPY(sender_addr,p);
truncstr(sender_addr,">");
/* get sender */
SAFECOPY(sender,sender_addr);
if(truncstr(sender,"@")==NULL)
sender[0]=0;
sockprintf(socket, "354 send the mail data, end with <CRLF>.<CRLF>");
if(telegram)
state=SMTP_STATE_DATA_BODY; /* No RFC headers in Telegrams */
else
state=SMTP_STATE_DATA_HEADER;
hdr_lines=0;
continue;
}
sockprintf(socket,"500 Syntax error");
lprintf(LOG_WARNING,"%04d !SMTP UNSUPPORTED COMMAND: '%s'", socket, buf);
if(++badcmds>9) {
lprintf(LOG_WARNING,"%04d !TOO MANY INVALID COMMANDS (%u)",socket,badcmds);
break;
}
}
/* Free up resources here */
smb_freemsgmem(&msg);
if(msgtxt!=NULL) {
fclose(msgtxt);
if(!(startup->options&MAIL_OPT_DEBUG_RX_BODY))
unlink(msgtxt_fname);
}
if(rcptlst!=NULL) {
fclose(rcptlst);
unlink(rcptlst_fname);
}
if(spy!=NULL)
fclose(spy);
status(STATUS_WFC);
if(active_clients)
active_clients--, update_clients();
client_off(socket);
thread_down();
lprintf(LOG_DEBUG,"%04d SMTP RX Session thread terminated (%u threads remain, %lu clients served)"
,socket, thread_count, served);
/* Must be last */
mail_close_socket(socket);
}
BOOL bounce(smb_t* smb, smbmsg_t* msg, char* err, BOOL immediate)
{
char str[128];
char attempts[64];
int i;
ushort agent=AGENT_SMTPSYSMSG;
smbmsg_t newmsg;
msg->hdr.delivery_attempts++;
lprintf(LOG_WARNING,"0000 !Delivery attempt #%u FAILED (%s) for message #%lu from %s to %s"
,msg->hdr.delivery_attempts
,err
,msg->hdr.number
,msg->from
,msg->to_net.addr);
if((i=smb_updatemsg(smb,msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"0000 !BOUNCE ERROR %d (%s) incrementing delivery attempt counter"
,i, smb->last_error);
return(FALSE);
}
if(!immediate && msg->hdr.delivery_attempts < startup->max_delivery_attempts)
return(TRUE);
newmsg=*msg;
/* Mark original message as deleted */
msg->hdr.attr|=MSG_DELETE;
i=smb_updatemsg(smb,msg);
if(msg->hdr.auxattr&MSG_FILEATTACH)
delfattach(&scfg,msg);
if(i!=SMB_SUCCESS) {
lprintf(LOG_ERR,"0000 !BOUNCE ERROR %d (%s) deleting message"
,i, smb->last_error);
return(FALSE);
}
if(msg->from_agent!=AGENT_PERSON /* don't bounce 'bounce messages' */
|| (msg->idx.from==0 && msg->from_net.type==NET_NONE)
|| (msg->reverse_path!=NULL && *msg->reverse_path==0)) {
lprintf(LOG_WARNING,"0000 !Deleted undeliverable message from %s", msg->from);
return(TRUE);
}
lprintf(LOG_WARNING,"0000 !Bouncing message back to %s", msg->from);
newmsg.hfield=NULL;
newmsg.hfield_dat=NULL;
newmsg.total_hfields=0;
newmsg.hdr.delivery_attempts=0;
SAFEPRINTF(str,"Delivery failure: %s",newmsg.subj);
smb_hfield_str(&newmsg, SUBJECT, str);
smb_hfield_str(&newmsg, RECIPIENT, newmsg.from);
if(newmsg.from_ext!=NULL) { /* Back to sender */
smb_hfield_str(&newmsg, RECIPIENTEXT, newmsg.from_ext);
newmsg.from_ext=NULL; /* Clear the sender extension */
}
if((newmsg.from_net.type==NET_QWK || newmsg.from_net.type==NET_INTERNET)
&& newmsg.reverse_path!=NULL) {
smb_hfield(&newmsg, RECIPIENTNETTYPE, sizeof(newmsg.from_net.type), &newmsg.from_net.type);
smb_hfield_str(&newmsg, RECIPIENTNETADDR, newmsg.reverse_path);
}
strcpy(str,"Mail Delivery Subsystem");
smb_hfield_str(&newmsg, SENDER, str);
smb_hfield(&newmsg, SENDERAGENT, sizeof(agent), &agent);
/* Put error message in subject for now */
if(msg->hdr.delivery_attempts>1)
sprintf(attempts,"after %u attempts", msg->hdr.delivery_attempts);
else
attempts[0]=0;
SAFEPRINTF2(str,"%s reporting delivery failure of message %s"
,startup->host_name, attempts);
smb_hfield_str(&newmsg, SMB_COMMENT, str);
SAFEPRINTF2(str,"from %s to %s\r\n"
,msg->reverse_path==NULL ? msg->from : msg->reverse_path
,(char*)msg->to_net.addr);
smb_hfield_str(&newmsg, SMB_COMMENT, str);
strcpy(str,"Reason:");
smb_hfield_str(&newmsg, SMB_COMMENT, str);
smb_hfield_str(&newmsg, SMB_COMMENT, err);
smb_hfield_str(&newmsg, SMB_COMMENT, "\r\nOriginal message text follows:\r\n");
if((i=smb_addmsghdr(smb,&newmsg,SMB_SELFPACK))!=SMB_SUCCESS)
lprintf(LOG_ERR,"0000 !BOUNCE ERROR %d (%s) adding message header"
,i,smb->last_error);
else {
lprintf(LOG_WARNING,"0000 !Delivery failure notification (message #%ld) created for %s"
,newmsg.hdr.number, newmsg.from);
if((i=smb_incmsg_dfields(smb,&newmsg,1))!=SMB_SUCCESS)
lprintf(LOG_ERR,"0000 !BOUNCE ERROR %d (%s) incrementing data allocation units"
,i,smb->last_error);
}
newmsg.dfield=NULL; /* Don't double-free the data fields */
newmsg.hdr.total_dfields=0;
smb_freemsgmem(&newmsg);
return(TRUE);
}
static int remove_msg_intransit(smb_t* smb, smbmsg_t* msg)
{
int i;
if((i=smb_lockmsghdr(smb,msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"0000 !SEND ERROR %d (%s) locking message header #%lu"
,i, smb->last_error, msg->idx.number);
return(i);
}
msg->hdr.netattr&=~MSG_INTRANSIT;
i=smb_putmsghdr(smb,msg);
smb_unlockmsghdr(smb,msg);
if(i!=0)
lprintf(LOG_ERR,"0000 !SEND ERROR %d (%s) writing message header #%lu"
,i, smb->last_error, msg->idx.number);
return(i);
}
void get_dns_server(char* dns_server, size_t len)
{
str_list_t list;
size_t count;
sprintf(dns_server,"%.*s",len,startup->dns_server);
if(!isalnum(dns_server[0])) {
if((list=getNameServerList())!=NULL) {
if((count=strListCount(list))>0) {
sprintf(dns_server,"%.*s",len,list[xp_random(count)]);
lprintf(LOG_DEBUG,"0000 SEND using auto-detected DNS server address: %s"
,dns_server);
}
freeNameServerList(list);
}
}
}
#ifdef __BORLANDC__
#pragma argsused
#endif
static void sendmail_thread(void* arg)
{
int i,j;
char to[128];
char mx[128];
char mx2[128];
char err[1024];
char buf[512];
char str[128];
char resp[512];
char toaddr[256];
char fromaddr[256];
char challenge[256];
char secret[64];
char md5_data[384];
char digest[MD5_DIGEST_SIZE];
char numeric_ip[16];
char domain_list[MAX_PATH+1];
char dns_server[16];
char* server;
char* msgtxt=NULL;
char* p;
ushort port;
ulong last_msg=0;
ulong ip_addr;
ulong dns;
ulong lines;
BOOL success;
BOOL first_cycle=TRUE;
SOCKET sock=INVALID_SOCKET;
SOCKADDR_IN addr;
SOCKADDR_IN server_addr;
time_t last_scan=0;
smb_t smb;
smbmsg_t msg;
mail_t* mail;
long msgs;
long l;
thread_up(TRUE /* setuid */);
sendmail_running=TRUE;
terminate_sendmail=FALSE;
lprintf(LOG_DEBUG,"0000 SendMail thread started");
memset(&msg,0,sizeof(msg));
memset(&smb,0,sizeof(smb));
while(server_socket!=INVALID_SOCKET && !terminate_sendmail) {
if(startup->options&MAIL_OPT_NO_SENDMAIL) {
sem_trywait_block(&sendmail_wakeup_sem,1000);
continue;
}
if(active_sendmail!=0)
active_sendmail=0, update_clients();
smb_close(&smb);
if(sock!=INVALID_SOCKET) {
mail_close_socket(sock);
sock=INVALID_SOCKET;
}
if(msgtxt!=NULL) {
smb_freemsgtxt(msgtxt);
msgtxt=NULL;
}
smb_freemsgmem(&msg);
/* Don't delay on first loop */
if(first_cycle)
first_cycle=FALSE;
else
sem_trywait_block(&sendmail_wakeup_sem,startup->sem_chk_freq*1000);
sprintf(smb.file,"%smail",scfg.data_dir);
smb.retry_time=scfg.smb_retry_time;
smb.subnum=INVALID_SUB;
if((i=smb_open(&smb))!=SMB_SUCCESS)
continue;
if((i=smb_locksmbhdr(&smb))!=SMB_SUCCESS)
continue;
i=smb_getstatus(&smb);
smb_unlocksmbhdr(&smb);
if(i!=0)
continue;
if(smb.status.last_msg==last_msg && time(NULL)-last_scan<startup->rescan_frequency)
continue;
last_msg=smb.status.last_msg;
last_scan=time(NULL);
mail=loadmail(&smb,&msgs,/* to network */0,MAIL_YOUR,0);
for(l=0; l<msgs; l++) {
if(active_sendmail!=0)
active_sendmail=0, update_clients();
if(server_socket==INVALID_SOCKET || terminate_sendmail) /* server stopped */
break;
if(sock!=INVALID_SOCKET) {
mail_close_socket(sock);
sock=INVALID_SOCKET;
}
if(msgtxt!=NULL) {
smb_freemsgtxt(msgtxt);
msgtxt=NULL;
}
smb_freemsgmem(&msg);
msg.hdr.number=mail[l].number;
if((i=smb_getmsgidx(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_ERR,"0000 !SEND ERROR %d (%s) getting message index #%lu"
,i, smb.last_error, mail[l].number);
break;
}
if((i=smb_lockmsghdr(&smb,&msg))!=SMB_SUCCESS) {
lprintf(LOG_WARNING,"0000 !SEND ERROR %d (%s) locking message header #%lu"
,i, smb.last_error, msg.idx.number);
continue;
}
if((i=smb_getmsghdr(&smb,&msg))!=SMB_SUCCESS) {
smb_unlockmsghdr(&smb,&msg);
lprintf(LOG_ERR,"0000 !SEND ERROR %d (%s) reading message header #%lu"
,i, smb.last_error, msg.idx.number);
continue;
}
if(msg.to_net.type!=NET_INTERNET || msg.to_net.addr==NULL) {
smb_unlockmsghdr(&smb,&msg);
continue;
}
if(!(startup->options&MAIL_OPT_SEND_INTRANSIT) && msg.hdr.netattr&MSG_INTRANSIT) {
smb_unlockmsghdr(&smb,&msg);
lprintf(LOG_ERR,"0000 SEND Message #%lu from %s to %s - in transit"
,msg.hdr.number, msg.from, msg.to_net.addr);
continue;
}
msg.hdr.netattr|=MSG_INTRANSIT; /* Prevent another sendmail thread from sending this msg */
smb_putmsghdr(&smb,&msg);
smb_unlockmsghdr(&smb,&msg);
active_sendmail=1, update_clients();
lprintf(LOG_INFO,"0000 SEND Message #%lu from %s to %s"
,msg.hdr.number, msg.from, msg.to_net.addr);
status("Sending");
#ifdef _WIN32
if(startup->outbound_sound[0] && !(startup->options&MAIL_OPT_MUTE))
PlaySound(startup->outbound_sound, NULL, SND_ASYNC|SND_FILENAME);
#endif
lprintf(LOG_DEBUG,"0000 SEND getting message text");
if((msgtxt=smb_getmsgtxt(&smb,&msg,GETMSGTXT_ALL))==NULL) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_ERR,"0000 !SEND ERROR (%s) retrieving message text",smb.last_error);
continue;
}
port=0;
/* Check if this is a local email ToDo */
SAFECOPY(to,(char*)msg.to_net.addr);
truncstr(to,"> ");
p=strrchr(to,'@');
if(p==NULL) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_WARNING,"0000 !SEND INVALID destination address: %s", to);
SAFEPRINTF(err,"Invalid destination address: %s", to);
bounce(&smb,&msg,err,TRUE);
continue;
}
p++;
sprintf(domain_list,"%sdomains.cfg",scfg.ctrl_dir);
if(stricmp(p,scfg.sys_inetaddr)==0
|| stricmp(p,startup->host_name)==0
|| findstr(p,domain_list)) {
/* This is a local message... no need to send to remote */
port = startup->smtp_port;
if(startup->interface_addr==0)
server="127.0.0.1";
else {
sprintf(numeric_ip, "%u.%u.%u.%u"
, startup->interface_addr >> 24
, (startup->interface_addr >> 16) & 0xff
, (startup->interface_addr >> 8) & 0xff
, startup->interface_addr & 0xff);
server = numeric_ip;
}
}
else {
if(startup->options&MAIL_OPT_RELAY_TX) {
server=startup->relay_server;
port=startup->relay_port;
} else {
p=strrchr((char*)msg.to_net.addr,':'); /* non-standard SMTP port */
if(p!=NULL) {
*p=0;
port=atoi(p+1);
}
#if 0 /* Already done */
SAFECOPY(to,(char*)msg.to_net.addr);
truncstr(to,"> ");
#endif
p=strrchr(to,'@');
#if 0 /* Already done */
if(p==NULL) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_WARNING,"0000 !SEND INVALID destination address: %s", to);
SAFEPRINTF(err,"Invalid destination address: %s", to);
bounce(&smb,&msg,err,TRUE);
continue;
}
#endif
get_dns_server(dns_server,sizeof(dns_server));
if((dns=resolve_ip(dns_server))==INADDR_NONE) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_WARNING,"0000 !SEND INVALID DNS server address: %s"
,dns_server);
continue;
}
p++;
lprintf(LOG_DEBUG,"0000 SEND getting MX records for %s from %s",p,dns_server);
if((i=dns_getmx(p, mx, mx2, startup->interface_addr, dns
,startup->options&MAIL_OPT_USE_TCP_DNS ? TRUE : FALSE
,TIMEOUT_THREAD_WAIT/2))!=0) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_WARNING,"0000 !SEND ERROR %d obtaining MX records for %s from %s"
,i,p,startup->dns_server);
SAFEPRINTF2(err,"Error %d obtaining MX record for %s",i,p);
bounce(&smb,&msg,err,FALSE);
continue;
}
server=mx;
}
}
if(!port)
port=IPPORT_SMTP;
if((sock=mail_open_socket(SOCK_STREAM))==INVALID_SOCKET) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_ERR,"0000 !SEND ERROR %d opening socket", ERROR_VALUE);
continue;
}
memset(&addr,0,sizeof(addr));
addr.sin_addr.s_addr = htonl(startup->interface_addr);
addr.sin_family = AF_INET;
if(startup->seteuid!=NULL)
startup->seteuid(FALSE);
i=bind(sock,(struct sockaddr *)&addr, sizeof(addr));
if(startup->seteuid!=NULL)
startup->seteuid(TRUE);
if(i!=0) {
remove_msg_intransit(&smb,&msg);
lprintf(LOG_ERR,"%04d !SEND ERROR %d (%d) binding socket", sock, i, ERROR_VALUE);
continue;
}
strcpy(err,"UNKNOWN ERROR");
success=FALSE;
for(j=0;j<2 && !success;j++) {
if(j) {
if(startup->options&MAIL_OPT_RELAY_TX || !mx2[0])
break;
server=mx2; /* Give second mx record a try */
}
lprintf(LOG_DEBUG,"%04d SEND resolving SMTP hostname: %s", sock, server);
ip_addr=resolve_ip(server);
if(ip_addr==INADDR_NONE) {
SAFEPRINTF(err,"Failed to resolve SMTP hostname: %s",server);
continue;
}
memset(&server_addr,0,sizeof(server_addr));
server_addr.sin_addr.s_addr = ip_addr;
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
if((server==mx || server==mx2) && (ip_addr&0xff)==127) {
SAFEPRINTF2(err,"Bad IP address (%s) for MX server: %s"
,inet_ntoa(server_addr.sin_addr),server);
continue;
}
lprintf(LOG_INFO,"%04d SEND connecting to port %u on %s [%s]"
,sock
,ntohs(server_addr.sin_port)
,server,inet_ntoa(server_addr.sin_addr));
if((i=connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)))!=0) {
i=ERROR_VALUE;
lprintf(LOG_WARNING,"%04d !SEND ERROR %d connecting to SMTP server: %s"
,sock
,i, server);
SAFEPRINTF2(err,"Error %d connecting to SMTP server: %s"
,i, server);
continue;
}
success=TRUE;
}
if(!success) { /* Failed to send, so bounce */
remove_msg_intransit(&smb,&msg);
bounce(&smb,&msg,err,FALSE);
continue;
}
lprintf(LOG_DEBUG,"%04d SEND connected to %s",sock,server);
/* HELO */
if(!sockgetrsp(sock,"220",buf,sizeof(buf))) {
remove_msg_intransit(&smb,&msg);
SAFEPRINTF3(err,badrsp_err,server,buf,"220");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
if(startup->options&MAIL_OPT_RELAY_TX
&& (startup->options&MAIL_OPT_RELAY_AUTH_MASK)!=0) /* Requires ESMTP */
sockprintf(sock,"EHLO %s",startup->host_name);
else
sockprintf(sock,"HELO %s",startup->host_name);
if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
remove_msg_intransit(&smb,&msg);
SAFEPRINTF3(err,badrsp_err,server,buf,"250");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
/* AUTH */
if(startup->options&MAIL_OPT_RELAY_TX
&& (startup->options&MAIL_OPT_RELAY_AUTH_MASK)!=0) {
switch(startup->options&MAIL_OPT_RELAY_AUTH_MASK) {
case MAIL_OPT_RELAY_AUTH_PLAIN:
p="PLAIN";
break;
case MAIL_OPT_RELAY_AUTH_LOGIN:
p="LOGIN";
break;
case MAIL_OPT_RELAY_AUTH_CRAM_MD5:
p="CRAM-MD5";
break;
default:
p="<unknown>";
break;
}
sockprintf(sock,"AUTH %s",p);
if(!sockgetrsp(sock,"334",buf,sizeof(buf))) {
SAFEPRINTF3(err,badrsp_err,server,buf,"334 Username/Challenge");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
switch(startup->options&MAIL_OPT_RELAY_AUTH_MASK) {
case MAIL_OPT_RELAY_AUTH_PLAIN:
p=startup->relay_user;
break;
case MAIL_OPT_RELAY_AUTH_LOGIN:
b64_encode(p=resp,sizeof(resp),startup->relay_user,0);
break;
case MAIL_OPT_RELAY_AUTH_CRAM_MD5:
p=buf;
FIND_WHITESPACE(p);
SKIP_WHITESPACE(p);
b64_decode(challenge,sizeof(challenge),p,0);
/* Calculate response */
memset(secret,0,sizeof(secret));
SAFECOPY(secret,startup->relay_pass);
for(i=0;i<sizeof(secret);i++)
md5_data[i]=secret[i]^0x36; /* ipad */
strcpy(md5_data+i,challenge);
MD5_calc(digest,md5_data,sizeof(secret)+strlen(challenge));
for(i=0;i<sizeof(secret);i++)
md5_data[i]=secret[i]^0x5c; /* opad */
memcpy(md5_data+i,digest,sizeof(digest));
MD5_calc(digest,md5_data,sizeof(secret)+sizeof(digest));
safe_snprintf(buf,sizeof(buf),"%s %s",startup->relay_user,MD5_hex(str,digest));
b64_encode(p=resp,sizeof(resp),buf,0);
break;
default:
p="<unknown>";
break;
}
sockprintf(sock,"%s",p);
if((startup->options&MAIL_OPT_RELAY_AUTH_MASK)!=MAIL_OPT_RELAY_AUTH_CRAM_MD5) {
if(!sockgetrsp(sock,"334",buf,sizeof(buf))) {
SAFEPRINTF3(err,badrsp_err,server,buf,"334 Password");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
switch(startup->options&MAIL_OPT_RELAY_AUTH_MASK) {
case MAIL_OPT_RELAY_AUTH_PLAIN:
p=startup->relay_pass;
break;
case MAIL_OPT_RELAY_AUTH_LOGIN:
b64_encode(p=buf,sizeof(buf),startup->relay_pass,0);
break;
default:
p="<unknown>";
break;
}
sockprintf(sock,"%s",p);
}
if(!sockgetrsp(sock,"235",buf,sizeof(buf))) {
SAFEPRINTF3(err,badrsp_err,server,buf,"235");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
}
/* MAIL */
if(msg.from_net.type==NET_INTERNET && msg.reverse_path!=NULL)
SAFECOPY(fromaddr,msg.reverse_path);
else
usermailaddr(&scfg,fromaddr,msg.from);
truncstr(fromaddr," ");
if(fromaddr[0]=='<')
sockprintf(sock,"MAIL FROM: %s",fromaddr);
else
sockprintf(sock,"MAIL FROM: <%s>",fromaddr);
if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
remove_msg_intransit(&smb,&msg);
SAFEPRINTF3(err,badrsp_err,server,buf,"250");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
/* RCPT */
if((p=strrchr((char*)msg.to_net.addr,'<'))!=NULL)
p++;
else
p=(char*)msg.to_net.addr;
SAFECOPY(toaddr,p);
truncstr(toaddr,"> ");
sockprintf(sock,"RCPT TO: <%s>", toaddr);
if(!sockgetrsp(sock,"25", buf, sizeof(buf))) {
remove_msg_intransit(&smb,&msg);
SAFEPRINTF3(err,badrsp_err,server,buf,"25*");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
/* DATA */
sockprintf(sock,"DATA");
if(!sockgetrsp(sock,"354", buf, sizeof(buf))) {
remove_msg_intransit(&smb,&msg);
SAFEPRINTF3(err,badrsp_err,server,buf,"354");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
lprintf(LOG_DEBUG,"%04d SEND sending message text (%u bytes)"
,sock, strlen(msgtxt));
lines=sockmsgtxt(sock,&msg,msgtxt,-1);
if(!sockgetrsp(sock,"250", buf, sizeof(buf))) {
remove_msg_intransit(&smb,&msg);
SAFEPRINTF3(err,badrsp_err,server,buf,"250");
bounce(&smb,&msg,err,buf[0]=='5');
continue;
}
lprintf(LOG_DEBUG,"%04d SEND message transfer complete (%lu lines)", sock, lines);
/* Now lets mark this message for deletion without corrupting the index */
msg.hdr.attr|=MSG_DELETE;
msg.hdr.netattr&=~MSG_INTRANSIT;
if((i=smb_updatemsg(&smb,&msg))!=SMB_SUCCESS)
lprintf(LOG_ERR,"%04d !SEND ERROR %d (%s) deleting message #%lu"
,sock, i, smb.last_error, msg.hdr.number);
if(msg.hdr.auxattr&MSG_FILEATTACH)
delfattach(&scfg,&msg);
/* QUIT */
sockprintf(sock,"QUIT");
sockgetrsp(sock,"221", buf, sizeof(buf));
mail_close_socket(sock);
sock=INVALID_SOCKET;
}
status(STATUS_WFC);
/* Free up resources here */
if(mail!=NULL)
freemail(mail);
}
if(sock!=INVALID_SOCKET)
mail_close_socket(sock);
smb_freemsgtxt(msgtxt);
smb_freemsgmem(&msg);
smb_close(&smb);
if(active_sendmail!=0)
active_sendmail=0, update_clients();
thread_down();
lprintf(LOG_DEBUG,"0000 SendMail thread terminated (%u threads remain)", thread_count);
sendmail_running=FALSE;
}
void DLLCALL mail_terminate(void)
{
lprintf(LOG_DEBUG,"%04d Mail Server terminate",server_socket);
terminate_server=TRUE;
}
static void cleanup(int code)
{
int i;
free_cfg(&scfg);
semfile_list_free(&recycle_semfiles);
semfile_list_free(&shutdown_semfiles);
if(mailproc_list!=NULL) {
for(i=0;i<mailproc_count;i++)
strListFree(&mailproc_list[i].to);
FREE_AND_NULL(mailproc_list);
}
if(server_socket!=INVALID_SOCKET) {
mail_close_socket(server_socket);
server_socket=INVALID_SOCKET;
}
if(pop3_socket!=INVALID_SOCKET) {
mail_close_socket(pop3_socket);
pop3_socket=INVALID_SOCKET;
}
update_clients();
#ifdef _WINSOCKAPI_
if(WSAInitialized && WSACleanup()!=0)
lprintf(LOG_ERR,"0000 !WSACleanup ERROR %d",ERROR_VALUE);
#endif
thread_down();
status("Down");
if(terminate_server || code)
lprintf(LOG_INFO,"#### Mail Server thread terminated (%u threads remain, %lu clients served)"
,thread_count, served);
if(startup!=NULL && startup->terminated!=NULL)
startup->terminated(startup->cbdata,code);
}
const char* DLLCALL mail_ver(void)
{
static char ver[256];
char compiler[32];
DESCRIBE_COMPILER(compiler);
sscanf("$Revision$", "%*s %s", revision);
sprintf(ver,"Synchronet Mail Server %s%s SMBLIB %s "
"Compiled %s %s with %s"
,revision
#ifdef _DEBUG
," Debug"
#else
,""
#endif
,smb_lib_ver()
,__DATE__, __TIME__, compiler
);
return(ver);
}
void DLLCALL mail_server(void* arg)
{
char* p;
char path[MAX_PATH+1];
char str[256];
char error[256];
char compiler[32];
SOCKADDR_IN server_addr;
SOCKADDR_IN client_addr;
socklen_t client_addr_len;
SOCKET client_socket;
int i;
int result;
ulong l;
time_t t;
time_t start;
time_t initialized=0;
fd_set socket_set;
SOCKET high_socket_set;
pop3_t* pop3;
smtp_t* smtp;
struct timeval tv;
FILE* fp;
str_list_t sec_list;
mail_ver();
startup=(mail_startup_t*)arg;
#ifdef _THREAD_SUID_BROKEN
startup->seteuid(TRUE);
#endif
if(startup==NULL) {
sbbs_beep(100,500);
fprintf(stderr, "No startup structure passed!\n");
return;
}
if(startup->size!=sizeof(mail_startup_t)) { /* verify size */
sbbs_beep(100,500);
sbbs_beep(300,500);
sbbs_beep(100,500);
fprintf(stderr, "Invalid startup structure!\n");
return;
}
/* Setup intelligent defaults */
if(startup->relay_port==0) startup->relay_port=IPPORT_SMTP;
if(startup->smtp_port==0) startup->smtp_port=IPPORT_SMTP;
if(startup->pop3_port==0) startup->pop3_port=IPPORT_POP3;
if(startup->rescan_frequency==0) startup->rescan_frequency=3600; /* 60 minutes */
if(startup->max_delivery_attempts==0) startup->max_delivery_attempts=50;
if(startup->max_inactivity==0) startup->max_inactivity=120; /* seconds */
if(startup->max_recipients==0) startup->max_recipients=100;
if(startup->sem_chk_freq==0) startup->sem_chk_freq=2;
#ifdef JAVASCRIPT
if(startup->js.max_bytes==0) startup->js.max_bytes=JAVASCRIPT_MAX_BYTES;
if(startup->js.cx_stack==0) startup->js.cx_stack=JAVASCRIPT_CONTEXT_STACK;
#endif
uptime=0;
served=0;
startup->recycle_now=FALSE;
startup->shutdown_now=FALSE;
terminate_server=FALSE;
do {
thread_up(FALSE /* setuid */);
status("Initializing");
memset(&scfg, 0, sizeof(scfg));
lprintf(LOG_INFO,"Synchronet Mail Server Revision %s%s"
,revision
#ifdef _DEBUG
," Debug"
#else
,""
#endif
);
DESCRIBE_COMPILER(compiler);
lprintf(LOG_INFO,"Compiled %s %s with %s", __DATE__, __TIME__, compiler);
lprintf(LOG_INFO,"SMBLIB %s (format %x.%02x)",smb_lib_ver(),smb_ver()>>8,smb_ver()&0xff);
sbbs_srand();
if(!winsock_startup()) {
cleanup(1);
return;
}
t=time(NULL);
lprintf(LOG_INFO,"Initializing on %.24s with options: %lx"
,CTIME_R(&t,str),startup->options);
/* Initial configuration and load from CNF files */
SAFECOPY(scfg.ctrl_dir,startup->ctrl_dir);
lprintf(LOG_INFO,"Loading configuration files from %s", scfg.ctrl_dir);
scfg.size=sizeof(scfg);
SAFECOPY(error,UNKNOWN_LOAD_ERROR);
if(!load_cfg(&scfg, NULL, TRUE, error)) {
lprintf(LOG_ERR,"!ERROR %s",error);
lprintf(LOG_ERR,"!Failed to load configuration files");
cleanup(1);
return;
}
if(startup->temp_dir[0])
SAFECOPY(scfg.temp_dir,startup->temp_dir);
else
SAFECOPY(scfg.temp_dir,"../temp");
prep_dir(scfg.ctrl_dir, scfg.temp_dir, sizeof(scfg.temp_dir));
MKDIR(scfg.temp_dir);
lprintf(LOG_DEBUG,"Temporary file directory: %s", scfg.temp_dir);
if(!isdir(scfg.temp_dir)) {
lprintf(LOG_ERR,"!Invalid temp directory: %s", scfg.temp_dir);
cleanup(1);
return;
}
/* Parse the mailproc[.host].ini */
mailproc_list=NULL;
mailproc_count=0;
iniFileName(path,sizeof(path),scfg.ctrl_dir,"mailproc.ini");
if((fp=iniOpenFile(path, /* create? */FALSE))!=NULL) {
lprintf(LOG_DEBUG,"Reading %s",path);
sec_list = iniReadSectionList(fp,/* prefix */NULL);
if((mailproc_count=strListCount(sec_list))!=0
&& (mailproc_list=malloc(mailproc_count*sizeof(struct mailproc)))!=NULL) {
for(i=0;i<mailproc_count;i++) {
memset(&mailproc_list[i],0,sizeof(struct mailproc));
SAFECOPY(mailproc_list[i].cmdline,sec_list[i]);
mailproc_list[i].to =
iniReadStringList(fp,sec_list[i],"to",",",NULL);
mailproc_list[i].passthru =
iniReadBool(fp,sec_list[i],"passthru",TRUE);
mailproc_list[i].native =
iniReadBool(fp,sec_list[i],"native",FALSE);
}
}
iniCloseFile(fp);
}
if(startup->host_name[0]==0)
SAFECOPY(startup->host_name,scfg.sys_inetaddr);
if(!(scfg.sys_misc&SM_LOCAL_TZ) && !(startup->options&MAIL_OPT_LOCAL_TIMEZONE)) {
if(putenv("TZ=UTC0"))
lprintf(LOG_ERR,"!putenv() FAILED");
tzset();
if((t=checktime())!=0) { /* Check binary time */
lprintf(LOG_ERR,"!TIME PROBLEM (%ld)",t);
cleanup(1);
return;
}
}
if(uptime==0)
uptime=time(NULL); /* this must be done *after* setting the timezone */
if(startup->max_clients==0) {
startup->max_clients=scfg.sys_nodes;
if(startup->max_clients<10)
startup->max_clients=10;
}
lprintf(LOG_DEBUG,"Maximum clients: %u",startup->max_clients);
lprintf(LOG_DEBUG,"Maximum inactivity: %u seconds",startup->max_inactivity);
active_clients=0,update_clients();
/* open a socket and wait for a client */
server_socket = mail_open_socket(SOCK_STREAM);
if(server_socket == INVALID_SOCKET) {
lprintf(LOG_ERR,"!ERROR %d opening socket", ERROR_VALUE);
cleanup(1);
return;
}
lprintf(LOG_DEBUG,"%04d SMTP socket opened",server_socket);
/*****************************/
/* Listen for incoming calls */
/*****************************/
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_addr.s_addr = htonl(startup->interface_addr);
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(startup->smtp_port);
if(startup->seteuid!=NULL)
startup->seteuid(FALSE);
result = retry_bind(server_socket,(struct sockaddr *)&server_addr,sizeof(server_addr)
,startup->bind_retry_count,startup->bind_retry_delay,"SMTP Server",lprintf);
if(startup->seteuid!=NULL)
startup->seteuid(TRUE);
if(result != 0) {
lprintf(LOG_ERR,"%04d %s",server_socket, BIND_FAILURE_HELP);
cleanup(1);
return;
}
lprintf(LOG_DEBUG,"%04d SMTP socket bound to port %u"
,server_socket, startup->smtp_port);
result = listen (server_socket, 1);
if(result != 0) {
lprintf(LOG_ERR,"%04d !ERROR %d (%d) listening on socket"
,server_socket, result, ERROR_VALUE);
cleanup(1);
return;
}
if(startup->options&MAIL_OPT_ALLOW_POP3) {
/* open a socket and wait for a client */
pop3_socket = mail_open_socket(SOCK_STREAM);
if(pop3_socket == INVALID_SOCKET) {
lprintf(LOG_ERR,"!ERROR %d opening POP3 socket", ERROR_VALUE);
cleanup(1);
return;
}
lprintf(LOG_DEBUG,"%04d POP3 socket opened",pop3_socket);
/*****************************/
/* Listen for incoming calls */
/*****************************/
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_addr.s_addr = htonl(startup->interface_addr);
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(startup->pop3_port);
if(startup->seteuid!=NULL)
startup->seteuid(FALSE);
result = retry_bind(pop3_socket,(struct sockaddr *)&server_addr,sizeof(server_addr)
,startup->bind_retry_count,startup->bind_retry_delay,"POP3 Server",lprintf);
if(startup->seteuid!=NULL)
startup->seteuid(TRUE);
if(result != 0) {
lprintf(LOG_ERR,"%04d %s",pop3_socket,BIND_FAILURE_HELP);
cleanup(1);
return;
}
lprintf(LOG_DEBUG,"%04d POP3 socket bound to port %u"
,pop3_socket, startup->pop3_port);
result = listen (pop3_socket, 1);
if(result != 0) {
lprintf(LOG_ERR,"%04d !ERROR %d (%d) listening on POP3 socket"
,pop3_socket, result, ERROR_VALUE);
cleanup(1);
return;
}
}
sem_init(&sendmail_wakeup_sem,0,0);
if(!(startup->options&MAIL_OPT_NO_SENDMAIL))
_beginthread(sendmail_thread, 0, NULL);
lprintf(LOG_NOTICE,"%04d Mail Server thread started",server_socket);
status(STATUS_WFC);
/* Setup recycle/shutdown semaphore file lists */
shutdown_semfiles=semfile_list_init(scfg.ctrl_dir,"shutdown","mail");
recycle_semfiles=semfile_list_init(scfg.ctrl_dir,"recycle","mail");
SAFEPRINTF(path,"%smailsrvr.rec",scfg.ctrl_dir); /* legacy */
semfile_list_add(&recycle_semfiles,path);
if(!initialized) {
initialized=time(NULL);
semfile_list_check(&initialized,recycle_semfiles);
semfile_list_check(&initialized,shutdown_semfiles);
}
/* signal caller that we've started up successfully */
if(startup->started!=NULL)
startup->started(startup->cbdata);
while(server_socket!=INVALID_SOCKET && !terminate_server) {
if(active_clients==0) {
if(!(startup->options&MAIL_OPT_NO_RECYCLE)) {
if((p=semfile_list_check(&initialized,recycle_semfiles))!=NULL) {
lprintf(LOG_INFO,"%04d Recycle semaphore file (%s) detected"
,server_socket,p);
break;
}
#if 0 /* unused */
if(startup->recycle_sem!=NULL && sem_trywait(&startup->recycle_sem)==0)
startup->recycle_now=TRUE;
#endif
if(startup->recycle_now==TRUE) {
lprintf(LOG_NOTICE,"%04d Recycle semaphore signaled", server_socket);
startup->recycle_now=FALSE;
break;
}
}
if(((p=semfile_list_check(&initialized,shutdown_semfiles))!=NULL
&& lprintf(LOG_INFO,"%04d Shutdown semaphore file (%s) detected"
,server_socket,p))
|| (startup->shutdown_now==TRUE
&& lprintf(LOG_INFO,"%04d Shutdown semaphore signaled",server_socket))) {
startup->shutdown_now=FALSE;
terminate_server=TRUE;
break;
}
}
/* now wait for connection */
FD_ZERO(&socket_set);
FD_SET(server_socket,&socket_set);
high_socket_set=server_socket+1;
if(startup->options&MAIL_OPT_ALLOW_POP3
&& pop3_socket!=INVALID_SOCKET) {
FD_SET(pop3_socket,&socket_set);
if(pop3_socket+1>high_socket_set)
high_socket_set=pop3_socket+1;
}
tv.tv_sec=startup->sem_chk_freq;
tv.tv_usec=0;
if((i=select(high_socket_set,&socket_set,NULL,NULL,&tv))<1) {
if(i==0)
continue;
if(ERROR_VALUE==EINTR)
lprintf(LOG_NOTICE,"%04d Mail Server listening interrupted",server_socket);
else if(ERROR_VALUE == ENOTSOCK)
lprintf(LOG_NOTICE,"%04d Mail Server sockets closed",server_socket);
else
lprintf(LOG_WARNING,"%04d !ERROR %d selecting sockets",server_socket,ERROR_VALUE);
continue;
}
if(server_socket!=INVALID_SOCKET && !terminate_server
&& FD_ISSET(server_socket,&socket_set)) {
client_addr_len = sizeof(client_addr);
client_socket = accept(server_socket, (struct sockaddr *)&client_addr
,&client_addr_len);
if(client_socket == INVALID_SOCKET)
{
#if 0 /* is this necessary still? */
if(ERROR_VALUE == ENOTSOCK || ERROR_VALUE == EINVAL) {
lprintf(LOG_NOTICE,"%04d SMTP socket closed while listening"
,server_socket);
break;
}
#endif
lprintf(LOG_WARNING,"%04d SMTP !ERROR %d accepting connection"
,server_socket, ERROR_VALUE);
#ifdef _WIN32
if(WSAGetLastError()==WSAENOBUFS) /* recycle (re-init WinSock) on this error */
break;
#endif
continue;
}
if(startup->socket_open!=NULL)
startup->socket_open(startup->cbdata,TRUE);
sockets++;
if(trashcan(&scfg,inet_ntoa(client_addr.sin_addr),"ip-silent")) {
mail_close_socket(client_socket);
continue;
}
if(active_clients>=startup->max_clients) {
lprintf(LOG_WARNING,"%04d SMTP !MAXIMUM CLIENTS (%u) reached, access denied"
,client_socket, startup->max_clients);
sockprintf(client_socket,"421 Maximum active clients reached, please try again later.");
mswait(3000);
mail_close_socket(client_socket);
continue;
}
l=1;
if((i=ioctlsocket(client_socket, FIONBIO, &l))!=0) {
lprintf(LOG_ERR,"%04d SMTP !ERROR %d (%d) disabling blocking on socket"
,client_socket, i, ERROR_VALUE);
mail_close_socket(client_socket);
continue;
}
if((smtp=malloc(sizeof(smtp_t)))==NULL) {
lprintf(LOG_CRIT,"%04d SMTP !ERROR allocating %u bytes of memory for smtp_t"
,client_socket, sizeof(smtp_t));
mail_close_socket(client_socket);
continue;
}
smtp->socket=client_socket;
smtp->client_addr=client_addr;
_beginthread (smtp_thread, 0, smtp);
served++;
}
if(pop3_socket!=INVALID_SOCKET
&& FD_ISSET(pop3_socket,&socket_set)) {
client_addr_len = sizeof(client_addr);
client_socket = accept(pop3_socket, (struct sockaddr *)&client_addr
,&client_addr_len);
if(client_socket == INVALID_SOCKET)
{
#if 0 /* is this necessary still? */
if(ERROR_VALUE == ENOTSOCK || ERROR_VALUE == EINVAL) {
lprintf(LOG_NOTICE,"%04d POP3 socket closed while listening",pop3_socket);
break;
}
#endif
lprintf(LOG_WARNING,"%04d POP3 !ERROR %d accepting connection"
,pop3_socket, ERROR_VALUE);
#ifdef _WIN32
if(WSAGetLastError()==WSAENOBUFS) /* recycle (re-init WinSock) on this error */
break;
#endif
continue;
}
if(startup->socket_open!=NULL)
startup->socket_open(startup->cbdata,TRUE);
sockets++;
if(trashcan(&scfg,inet_ntoa(client_addr.sin_addr),"ip-silent")) {
mail_close_socket(client_socket);
continue;
}
if(active_clients>=startup->max_clients) {
lprintf(LOG_WARNING,"%04d POP3 !MAXIMUM CLIENTS (%u) reached, access denied"
,client_socket, startup->max_clients);
sockprintf(client_socket,"-ERR Maximum active clients reached, please try again later.");
mswait(3000);
mail_close_socket(client_socket);
continue;
}
l=1;
if((i=ioctlsocket(client_socket, FIONBIO, &l))!=0) {
lprintf(LOG_ERR,"%04d POP3 !ERROR %d (%d) disabling blocking on socket"
,client_socket, i, ERROR_VALUE);
sockprintf(client_socket,"-ERR System error, please try again later.");
mswait(3000);
mail_close_socket(client_socket);
continue;
}
if((pop3=malloc(sizeof(pop3_t)))==NULL) {
lprintf(LOG_CRIT,"%04d POP3 !ERROR allocating %u bytes of memory for pop3_t"
,client_socket,sizeof(pop3_t));
sockprintf(client_socket,"-ERR System error, please try again later.");
mswait(3000);
mail_close_socket(client_socket);
continue;
}
pop3->socket=client_socket;
pop3->client_addr=client_addr;
_beginthread (pop3_thread, 0, pop3);
served++;
}
}
if(active_clients) {
lprintf(LOG_DEBUG,"%04d Waiting for %d active clients to disconnect..."
,server_socket, active_clients);
start=time(NULL);
while(active_clients) {
if(time(NULL)-start>startup->max_inactivity) {
lprintf(LOG_WARNING,"%04d !TIMEOUT waiting for %d active clients"
,server_socket, active_clients);
break;
}
mswait(100);
}
}
if(sendmail_running) {
terminate_sendmail=TRUE;
sem_post(&sendmail_wakeup_sem);
mswait(100);
}
if(sendmail_running) {
lprintf(LOG_DEBUG,"%04d Waiting for SendMail thread to terminate..."
,server_socket);
start=time(NULL);
while(sendmail_running) {
if(time(NULL)-start>TIMEOUT_THREAD_WAIT) {
lprintf(LOG_WARNING,"%04d !TIMEOUT waiting for sendmail thread to terminate"
,server_socket);
break;
}
mswait(500);
}
}
if(!sendmail_running)
sem_destroy(&sendmail_wakeup_sem);
cleanup(0);
if(!terminate_server) {
lprintf(LOG_INFO,"Recycling server...");
mswait(2000);
if(startup->recycle!=NULL)
startup->recycle(startup->cbdata);
}
} while(!terminate_server);
}