mailsrvr.c

			lprintf("%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("%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 */
	mail_close_socket(socket);

	if(mail!=NULL)
		freemail(mail);

	smb_freemsgmem(&msg);
	smb_close(&smb);

	if(startup->options&MAIL_OPT_DEBUG_POP3)
		lprintf("%04d POP3 session thread terminated", socket);

	active_clients--;
	update_clients();
	client_off(socket);

	thread_down();
}

BOOL rblchk(DWORD mail_addr_n, char* rbl_addr)
{
	char		name[256];
	DWORD		mail_addr;

	mail_addr=ntohl(mail_addr_n);
	sprintf(name,"%ld.%ld.%ld.%ld.%s"
		,mail_addr&0xff
		,(mail_addr>>8)&0xff
		,(mail_addr>>16)&0xff
		,(mail_addr>>24)&0xff
		,rbl_addr
		);

	if(gethostbyname(name)==NULL)
		return(FALSE);

	return(TRUE);
}


static void smtp_thread(void* arg)
{
	int			i,j,x;
	int			rd;
	char		str[512];
	char		buf[1024],*p,*tp;
	char		hdrfield[512];
	char		alias_buf[128];
	char		reverse_path[128];
	char		date[64];
	char		month[16];
	char		rcpt_name[128];
	char		rcpt_addr[128];
	char		sender[128];
	char		sender_addr[128];
	char		hello_name[128];
	char		relay_list[MAX_PATH+1];
	char		domain_list[MAX_PATH+1];
	char		host_name[128];
	char		host_ip[64];
	char*		telegram_buf;
	int			addr_len;
	ushort		xlat;
	ushort		nettype=NET_NONE;
	uint		usernum;
	ulong		crc;
	ulong		length;
	ulong		offset;
	BOOL		esmtp=FALSE;
	BOOL		telegram=FALSE;
	FILE*		msgtxt=NULL;
	char		msgtxt_fname[MAX_PATH+1];
	FILE*		rcptlst;
	char		rcptlst_fname[MAX_PATH+1];
	FILE*		spy=NULL;
	SOCKET		socket;
	HOSTENT*	host;
	smb_t		smb;
	smbmsg_t	msg;
	smbmsg_t	newmsg;
	user_t		user;
	node_t		node;
	client_t	client;
	struct tm	tm;
	smtp_t		smtp=*(smtp_t*)arg;
	SOCKADDR_IN server_addr;
	enum {
			 SMTP_STATE_INITIAL
			,SMTP_STATE_HELO
			,SMTP_STATE_MAIL
			,SMTP_STATE_SEND
			,SMTP_STATE_SOML
			,SMTP_STATE_SAML
			,SMTP_STATE_RCPT
			,SMTP_STATE_DATA_HEADER
			,SMTP_STATE_DATA_BODY

	} state = SMTP_STATE_INITIAL;

	thread_up();

	free(arg);

	socket=smtp.socket;

	lprintf("%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("%04d !SMTP ERROR %d (%d) getting address/port"
			,socket, i, ERROR_VALUE);
		sockprintf(socket,"421 System error");
		mail_close_socket(socket);
		thread_down();
		return;
	} 

	memset(&msg,0,sizeof(msg));
	memset(&user,0,sizeof(user));

	strcpy(host_ip,inet_ntoa(smtp.client_addr.sin_addr));

	lprintf("%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)
		sprintf(host_name,"%.*s",(int)sizeof(host_name)-1,host->h_name);
	else
		strcpy(host_name,"<no name>");

	lprintf("%04d SMTP host name: %s", socket, host_name);

	strcpy(hello_name,host_name);

	if(trashcan(&scfg,host_ip,"ip")) {
		lprintf("%04d !SMTP SERVER BLOCKED in ip.can: %s"
			,socket, host_ip);
		sockprintf(socket,"550 Access denied.");
		mail_close_socket(socket);
		thread_down();
		return;
	}

	if(trashcan(&scfg,host_name,"host")) {
		lprintf("%04d !SMTP SERVER BLOCKED in host.can: %s"
			,socket, host_name);
		sockprintf(socket,"550 Access denied.");
		mail_close_socket(socket);
		thread_down();
		return;
	}

	/*  SPAM Filters (mail-abuse.org) */
	if(startup->options&MAIL_OPT_USE_RBL
		&& rblchk(smtp.client_addr.sin_addr.s_addr
			,"blackholes.mail-abuse.org"
			)==TRUE) {
		lprintf("%04d !SMTP SPAM server filtered (RBL): %s [%s]"
			,socket, host_name, host_ip);
		spamlog(&scfg, "Listed on RBL (http://mail-abuse.org/rbl)"
			,host_name, host_ip);
		sockprintf(socket
			,"571 Mail from %s refused, see http://mail-abuse.org/rbl"
			,host_ip);
		mail_close_socket(socket);
		thread_down();
		return;
	}
	if(startup->options&MAIL_OPT_USE_DUL
		&& rblchk(smtp.client_addr.sin_addr.s_addr
			,"dialups.mail-abuse.org"
			)==TRUE) {
		lprintf("%04d !SMTP SPAM server filtered (DUL): %s [%s]"
			,socket, host_name, host_ip);
		spamlog(&scfg, "Listed on DUL (http://mail-abuse.org/dul)"
			,host_name, host_ip);
		sockprintf(socket
			,"571 Mail from %s refused, see http://mail-abuse.org/dul"
			,host_ip);
		mail_close_socket(socket);
		thread_down();
		return;
	}
	if(startup->options&MAIL_OPT_USE_RSS
		&& rblchk(smtp.client_addr.sin_addr.s_addr
			,"relays.mail-abuse.org"
			)==TRUE) {
		lprintf("%04d !SMTP SPAM server filtered (RSS): %s [%s]"
			,socket, host_name, host_ip);
		spamlog(&scfg, "Listed on RSS (http://mail-abuse.org/rss)"
			,host_name, host_ip);
		sockprintf(socket
			,"571 Mail from %s refused, see http://mail-abuse.org/rss"
			,host_ip);					
		mail_close_socket(socket);
		thread_down();
		return;
	}

	sprintf(rcptlst_fname,"%sSMTP%d.LST", scfg.data_dir, socket);
	rcptlst=fopen(rcptlst_fname,"w+");
	if(rcptlst==NULL) {
		lprintf("%04d !SMTP ERROR %d creating recipient list: %s"
			,socket, errno, rcptlst_fname);
		sockprintf(socket,"421 System error");
		mail_close_socket(socket);
		thread_down();
		return;
	}

	if(trashcan(&scfg,host_name,"smtpspy") 
		|| trashcan(&scfg,host_ip,"smtpspy")) {
		sprintf(str,"%sSMTPSPY.TXT", scfg.data_dir);
		spy=fopen(str,"a");
	}

	active_clients++;
	update_clients();

	/* Initialize client display */
	client.size=sizeof(client);
	client.time=time(NULL);
	sprintf(client.addr,"%.*s",(int)sizeof(client.addr)-1,host_ip);
	sprintf(client.host,"%.*s",(int)sizeof(client.host)-1,host_name);
	client.port=ntohs(smtp.client_addr.sin_port);
	client.protocol="SMTP";
	client.user="<unknown>";
	client_on(socket,&client);

	sprintf(str,"SMTP: %s",host_ip);
	status(str);

	sockprintf(socket,"220 %s Synchronet SMTP Server for %s v%s Ready"
		,scfg.sys_inetaddr,PLATFORM_DESC,MAIL_VERSION);
	while(1) {
		rd = sockreadline(socket, buf, sizeof(buf));
		if(rd<1) 
			break;
		truncsp(buf);
		if(spy!=NULL)
			fprintf(spy,"%s\n",buf);
		if(state>=SMTP_STATE_DATA_HEADER) {
			if(!strcmp(buf,".")) {

				state=SMTP_STATE_HELO;	/* RESET state machine here in case of error */

				if(msgtxt==NULL) {
					lprintf("%04d !SMTP NO MESSAGE TEXT FILE POINTER?", socket);
					sockprintf(socket,SMTP_OK);
					continue;
				}

				lprintf("%04d SMTP End of message (%lu bytes)", socket, ftell(msgtxt));

				if(telegram==TRUE) {
					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 */
						sprintf(str,"\1n\1h%s [\1n%s\1h] (\1n%s\1h)\1n: "
							,sender_addr,host_ip,host_name);
					else
						sprintf(str,"\1n\1h%s\1n: ",sender_addr);
					
					if((telegram_buf=(char*)malloc(length+strlen(str)+1))==NULL) {
						lprintf("%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);
					if(fread(telegram_buf+strlen(str),1,length,msgtxt)!=length) {
						lprintf("%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 */
					rewind(rcptlst);
					while(!feof(rcptlst)) {
						if(fgets(str,sizeof(str)-1,rcptlst)==NULL)
							break;
						usernum=atoi(str);
						if(fgets(rcpt_name,sizeof(rcpt_name)-1,rcptlst)==NULL)
							break;
						truncsp(rcpt_name);
						if(fgets(rcpt_addr,sizeof(rcpt_addr)-1,rcptlst)==NULL)
							break;
						truncsp(rcpt_addr);
						putsmsg(&scfg,usernum,telegram_buf);
						lprintf("%04d SMTP Created telegram from %s to %s <%s>"
							,socket, sender_addr, rcpt_name, rcpt_addr);
					}
					free(telegram_buf);
					sockprintf(socket,SMTP_OK);
					telegram=FALSE;
					continue;
				}
				telegram=FALSE;

				if(sender[0]==0) {
					lprintf("%04d !SMTP MISSING mail header 'FROM' field", socket);
					sockprintf(socket, "554 Mail header missing 'FROM' field");
					continue;
				}
				nettype=NET_INTERNET;
				smb_hfield(&msg, SENDER, (ushort)strlen(sender), sender);
				smb_hfield(&msg, SENDERNETTYPE, sizeof(nettype), &nettype);
				smb_hfield(&msg, SENDERNETADDR, (ushort)strlen(sender_addr), sender_addr);

				rewind(msgtxt);
				sprintf(smb.file,"%smail", scfg.data_dir);
				smb.retry_time=scfg.smb_retry_time;
				if((i=smb_open(&smb))!=0) {
					lprintf("%04d !SMTP ERROR %d (%s) opening %s"
						,socket, i, smb.last_error, smb.file);
					sockprintf(socket, "452 Insufficient system storage");
					continue;
				}

				if(smb_fgetlength(smb.shd_fp)<1) {	 /* Create it if it doesn't exist */
					smb.status.max_crcs=scfg.mail_maxcrcs;
					smb.status.max_age=scfg.mail_maxage;
					smb.status.max_msgs=MAX_SYSMAIL;
					smb.status.attr=SMB_EMAIL;
					if((i=smb_create(&smb))!=0) {
						smb_close(&smb);
						lprintf("%04d !SMTP ERROR %d creating %s"
							,socket, i, smb.file);
						sockprintf(socket, "452 Insufficient system storage");
						continue;
					} 
				}

				if((i=smb_locksmbhdr(&smb))!=0) {
					smb_close(&smb);
					lprintf("%04d !SMTP ERROR %d locking %s"
						,socket, i, smb.file);
					sockprintf(socket, "452 Insufficient system storage");
					continue; 
				}

				length=filelength(fileno(msgtxt))+2;	 /* +2 for translation string */

				if((i=smb_open_da(&smb))!=0) {
					smb_unlocksmbhdr(&smb);
					smb_close(&smb);
					lprintf("%04d !SMTP ERROR %d (%s) opening %s.sda"
						,socket, i, smb.last_error, smb.file);
					sockprintf(socket, "452 Insufficient system storage");
					continue; 
				}

				if(scfg.sys_misc&SM_FASTMAIL)
					offset=smb_fallocdat(&smb,length,1);
				else
					offset=smb_allocdat(&smb,length,1);
				smb_close_da(&smb);

				smb_fseek(smb.sdt_fp,offset,SEEK_SET);
				xlat=XLAT_NONE;
				smb_fwrite(&xlat,2,smb.sdt_fp);
				x=SDT_BLOCK_LEN-2;				/* Don't read/write more than 255 */
				while(!feof(msgtxt)) {
					memset(buf,0,x);
					j=fread(buf,1,x,msgtxt);
					if(j<1)
						break;
					if((j!=x || feof(msgtxt)) && buf[j-1]=='\n' && buf[j-2]=='\r')
						buf[j-1]=buf[j-2]=0;
					if(scfg.mail_maxcrcs) {
						for(i=0;i<j;i++)
							crc=ucrc32(buf[i],crc); 
					}
					smb_fwrite(buf,j,smb.sdt_fp);
					x=SDT_BLOCK_LEN; 
				}
				smb_fflush(smb.sdt_fp);
				crc=~crc;

				if(scfg.mail_maxcrcs) {
					i=smb_addcrc(&smb,crc);
					if(i) {
						smb_freemsgdat(&smb,offset,length,1);
						smb_unlocksmbhdr(&smb);
						smb_close(&smb);
						lprintf("%04d !SMTP DUPLICATE MESSAGE", socket);
						sockprintf(socket, "554 Duplicate Message");
						continue; 
					} 
				}

				msg.hdr.offset=offset;

				smb_dfield(&msg,TEXT_BODY,length);

				smb_unlocksmbhdr(&smb);
				if(msg.idx.subj==0) {
					p="";
					smb_hfield(&msg, SUBJECT, 0, p);
					msg.idx.subj=crc16(p);
				}
				rewind(rcptlst);
				while(!feof(rcptlst)) {
					if((i=smb_copymsgmem(&newmsg,&msg))!=0) {
						lprintf("%04d !SMTP ERROR %d copying message"
							,socket, i);
						break;
					}
					if(fgets(str,sizeof(str)-1,rcptlst)==NULL)
						break;
					usernum=atoi(str);
					fgets(rcpt_name,sizeof(rcpt_name)-1,rcptlst);
					if(fgets(rcpt_addr,sizeof(rcpt_addr)-1,rcptlst)==NULL)
						break;
					truncsp(rcpt_name);
					truncsp(rcpt_addr);

					snprintf(hdrfield,sizeof(hdrfield),
						"Received: from %s (%s [%s])\r\n"
						"          by %s [%s] (Synchronet Mail Server for %s v%s) with %s\r\n"
						"          for %s; %s"
						,host_name,hello_name,host_ip
						,scfg.sys_inetaddr,inet_ntoa(server_addr.sin_addr)
						,PLATFORM_DESC,MAIL_VERSION
						,esmtp ? "ESMTP" : "SMTP"
						,rcpt_addr,msgdate(msg.hdr.when_imported,date));
					smb_hfield(&newmsg, RFC822HEADER, (ushort)strlen(hdrfield), hdrfield);

					smb_hfield(&newmsg, RECIPIENT, (ushort)strlen(rcpt_name), rcpt_name);

					if(rcpt_addr[0]=='#') {	/* Local destination */
						newmsg.idx.to=atoi(rcpt_addr+1);
						smb_hfield(&newmsg, RECIPIENTEXT
							,(ushort)strlen(rcpt_addr+1), rcpt_addr+1);
					} else {
						newmsg.idx.to=0;
						nettype=NET_INTERNET;
						smb_hfield(&newmsg, RECIPIENTNETTYPE, nettype, &nettype);
						smb_hfield(&newmsg, RECIPIENTNETADDR
							,(ushort)strlen(rcpt_addr), rcpt_addr);
					}

					i=smb_addmsghdr(&smb,&newmsg,SMB_SELFPACK);
					smb_freemsgmem(&newmsg);
					if(i!=0) {
						lprintf("%04d !SMTP ERROR %d adding message header"
							,socket, i);
						break;
					}
					lprintf("%04d SMTP Created message #%ld from %s to %s <%s>"
						,socket, newmsg.hdr.number, sender, rcpt_name, rcpt_addr);
					if(usernum) {
						sprintf(str,"\7\1n\1hOn %.24s\r\n\1m%s \1n\1msent you e-mail from: "
							"\1h%s\1n\r\n"
							,ctime((const time_t*)&newmsg.hdr.when_imported.time)
							,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);
					}
				}
				smb_close(&smb);
				if(i) {
					smb_freemsgdat(&smb,offset,length,1);
					sockprintf(socket, "452 Insufficient system storage");
					continue;
				}
				sockprintf(socket,SMTP_OK);
				continue;
			}
			if(buf[0]==0 && state==SMTP_STATE_DATA_HEADER) {	
				state=SMTP_STATE_DATA_BODY;	/* Null line separates header and body */
				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);
				continue;
			}
			/* RFC822 Header parsing */
			if(startup->options&MAIL_OPT_DEBUG_RX_HEADER)
				lprintf("%04d SMTP %s",socket, buf);

			if(!strnicmp(buf, "SUBJECT:",8)) {
				p=buf+8;
				while(*p && *p<=' ') p++;
				smb_hfield(&msg, SUBJECT, (ushort)strlen(p), p);
				strlwr(p);
				msg.idx.subj=crc16(p);
				continue;
			}
			if(!strnicmp(buf, "TO:",3)) {
				p=buf+3;
				while(*p && *p<=' ') p++;
				if(*p=='<')  {
					p++;
					tp=strrchr(p,'>');
					if(tp) *tp=0;
				}
				continue;
			}
			if(!strnicmp(buf, "REPLY-TO:",9)) {
				p=buf+9;
				while(*p && *p<=' ') p++;
				if(*p=='<')  {
					p++;
					tp=strchr(p,'>');
					if(tp) *tp=0;
				}
				nettype=NET_INTERNET;
				smb_hfield(&msg, REPLYTONETTYPE, nettype, &nettype);
				smb_hfield(&msg, REPLYTONETADDR, (ushort)strlen(p), p);
				continue;
			}
			if(!strnicmp(buf, "FROM:",5)) {
				p=strchr(buf+5,'<');
				if(p) {
					p++;
					tp=strchr(p,'>');
					if(tp) *tp=0;
					sprintf(sender_addr,"%.*s",(int)sizeof(sender_addr)-1,p);
				} else {
					p=buf+5;
					while(*p && *p<=' ') p++;
					sprintf(sender_addr,"%.*s",(int)sizeof(sender_addr)-1,p);
				}
			
				p=buf+5;
				while(*p && *p<=' ') p++;
				if(*p=='"') { 
					p++;
					tp=strchr(p,'"');
				} else if(*p=='<') {
					p++;
					tp=strchr(p,'>');
				} else
					tp=strchr(p,'<');
				if(tp) *tp=0;
				truncsp(p);
				sprintf(sender,"%.*s",(int)sizeof(sender)-1,p);
				continue;
			}
			if(!strnicmp(buf, "DATE:",5)) {
				p=buf+5;
				while(*p && *p<=' ') p++;
/*				lprintf("Sent: %s",p); */
				memset(&tm,0,sizeof(tm));
				while(*p && !isdigit(*p)) p++;
				/* DAY */
				tm.tm_mday=atoi(p);
				while(*p && isdigit(*p)) p++;
				/* MONTH */
				while(*p && *p<=' ') p++;
				sprintf(month,"%3.3s",p);
				if(!stricmp(month,"jan"))
					tm.tm_mon=0;
				else if(!stricmp(month,"feb"))
					tm.tm_mon=1;
				else if(!stricmp(month,"mar"))
					tm.tm_mon=2;
				else if(!stricmp(month,"apr"))
					tm.tm_mon=3;
				else if(!stricmp(month,"may"))
					tm.tm_mon=4;
				else if(!stricmp(month,"jun"))
					tm.tm_mon=5;
				else if(!stricmp(month,"jul"))
					tm.tm_mon=6;
				else if(!stricmp(month,"aug"))
					tm.tm_mon=7;
				else if(!stricmp(month,"sep"))
					tm.tm_mon=8;
				else if(!stricmp(month,"oct"))
					tm.tm_mon=9;
				else if(!stricmp(month,"nov"))
					tm.tm_mon=10;
				else
					tm.tm_mon=11;
				p+=4;
				/* YEAR */
				tm.tm_year=atoi(p);
				if(tm.tm_year>1900)
					tm.tm_year-=1900;
				while(*p && isdigit(*p)) p++;
				/* HOUR */
				while(*p && *p<=' ') p++;
				tm.tm_hour=atoi(p);
				while(*p && isdigit(*p)) p++;
				/* MINUTE */
				if(*p) p++;
				tm.tm_min=atoi(p);
				while(*p && isdigit(*p)) p++;
				/* SECONDS */
				if(*p) p++;
				tm.tm_sec=atoi(p);
				while(*p && isdigit(*p)) p++;
				/* TIME ZONE */
				while(*p && *p<=' ') p++;
				if(*p && (isdigit(*p) || *p=='-')) { /* HHMM or -HHMM format */
					sprintf(str,"%.*s",*p=='-'? 3:2,p);
					msg.hdr.when_written.zone=atoi(str)*60;
					p+=(*p=='-') ? 3:2;
					msg.hdr.when_written.zone+=atoi(p);
				}
				else if(!strnicmp(p,"PDT",3))
					msg.hdr.when_written.zone=(short)PDT;
				else if(!strnicmp(p,"MDT",3))
					msg.hdr.when_written.zone=(short)MDT;
				else if(!strnicmp(p,"CDT",3))
					msg.hdr.when_written.zone=(short)CDT;
				else if(!strnicmp(p,"EDT",3))
					msg.hdr.when_written.zone=(short)EDT;
				else if(!strnicmp(p,"PST",3))
					msg.hdr.when_written.zone=(short)PST;
				else if(!strnicmp(p,"MST",3))
					msg.hdr.when_written.zone=(short)MST;
				else if(!strnicmp(p,"CST",3))
					msg.hdr.when_written.zone=(short)CST;
				else if(!strnicmp(p,"EST",3))
					msg.hdr.when_written.zone=(short)EST;
				msg.hdr.when_written.time=mktime(&tm);
				continue;
			}
			if(!strnicmp(buf, "MESSAGE-ID:",11)) {
				p=buf+11;
				while(*p && *p<=' ') p++;
				smb_hfield(&msg, RFC822MSGID, (ushort)strlen(p), p);
				continue;
			}
			if(!strnicmp(buf, "IN-REPLY-TO:",12)) {
				p=buf+12;
				while(*p && *p<=' ') p++;
				smb_hfield(&msg, RFC822REPLYID, (ushort)strlen(p), p);
				continue;
			}
			/* Fall-through */
			smb_hfield(&msg, RFC822HEADER, (ushort)strlen(buf), buf);
			continue;
		}
		lprintf("%04d SMTP RX: %s", socket, buf);
		if(!strnicmp(buf,"HELO",4)) {
			p=buf+4;
			while(*p && *p<=' ') p++;
			sprintf(hello_name,"%.*s",(int)sizeof(hello_name)-1,p);
			sockprintf(socket,"250 %s",scfg.sys_inetaddr);
			esmtp=FALSE;
			state=SMTP_STATE_HELO;
			telegram=FALSE;
			continue;
		}
		if(!strnicmp(buf,"EHLO",4)) {
			p=buf+4;
			while(*p && *p<=' ') p++;
			sprintf(hello_name,"%.*s",(int)sizeof(hello_name)-1,p);
			sockprintf(socket,"250 %s",scfg.sys_inetaddr);
			esmtp=TRUE;
			state=SMTP_STATE_HELO;
			telegram=FALSE;
			continue;
		}
		if(!stricmp(buf,"QUIT")) {
			sockprintf(socket,"221 %s Service closing transmission channel",scfg.sys_inetaddr);
			break;
		} 
		if(!stricmp(buf,"NOOP")) {
			sockprintf(socket, SMTP_OK);
			continue;
		}
		if(state<SMTP_STATE_HELO) {
			/* RFC 821 4.1.1 "The first command in a session must be the HELO command." */
			lprintf("%04d !SMTP MISSING 'HELO' command",socket);
			sockprintf(socket, SMTP_BADSEQ);
			continue;
		}
		if(!stricmp(buf,"TURN")) {
			sockprintf(socket,"502 command not supported");
			continue;
		}
		if(!stricmp(buf,"RSET")) {
			smb_freemsgmem(&msg);
			memset(&msg,0,sizeof(smbmsg_t));		/* Initialize message header */
			reverse_path[0]=0;
			sockprintf(socket,SMTP_OK);
			rewind(rcptlst);
			chsize(fileno(rcptlst),0);
			state=SMTP_STATE_HELO;
			telegram=FALSE;
			continue;
		}
		if(!strnicmp(buf,"MAIL FROM:",10)) {
			smb_freemsgmem(&msg);
			memset(&msg,0,sizeof(smbmsg_t));		/* Initialize message header */
			memcpy(msg.hdr.id,"SHD\x1a",4);
			msg.hdr.version=smb_ver();
			msg.hdr.when_imported.time=time(NULL);
			msg.hdr.when_imported.zone=scfg.sys_timezone;
			p=buf+10;
			while(*p && *p<=' ') p++;
			sprintf(reverse_path,"%.*s",(int)sizeof(reverse_path)-1,p);
			sockprintf(socket,SMTP_OK);
			state=SMTP_STATE_MAIL;
			continue;
		}

		/* Send a Message (Telegram) to a local ONLINE user */
		if(!strnicmp(buf,"SEND FROM:",10)) {
			p=buf+10;
			while(*p && *p<=' ') p++;
			sprintf(reverse_path,"%.*s",(int)sizeof(reverse_path)-1,p);
			sockprintf(socket,SMTP_OK);
			state=SMTP_STATE_SEND;
			continue;
		}
		/* Send OR Mail a Message to a local user */
		if(!strnicmp(buf,"SOML FROM:",10)) {
			p=buf+10;
			while(*p && *p<=' ') p++;
			sprintf(reverse_path,"%.*s",(int)sizeof(reverse_path)-1,p);
			sockprintf(socket,SMTP_OK);
			state=SMTP_STATE_SOML;
			continue;
		}
		/* Send AND Mail a Message to a local user */
		if(!strnicmp(buf,"SAML FROM:",10)) {
			p=buf+10;
			while(*p && *p<=' ') p++;
			sprintf(reverse_path,"%.*s",(int)sizeof(reverse_path)-1,p);
			sockprintf(socket,SMTP_OK);
			state=SMTP_STATE_SAML;
			continue;
		}

#if 0	/* No one uses this command */
		if(!strnicmp(buf,"VRFY",4)) {
			p=buf+4;
			while(*p && *p<=' ') p++;
			if(*p==0) {
				sockprintf(socket,"550 No user specified.");
				continue;
			}
#endif



		if(!strnicmp(buf,"RCPT TO:",8)) {

			if(state<SMTP_STATE_MAIL) {
				lprintf("%04d !SMTP MISSING 'MAIL' command",socket);
				sockprintf(socket, SMTP_BADSEQ);
				continue;
			}

			if(spy==NULL && trashcan(&scfg,reverse_path,"smtpspy")) {
				sprintf(str,"%sSMTPSPY.TXT", scfg.data_dir);
				spy=fopen(str,"a");
			}

			sprintf(str,"%.*s",(int)sizeof(str)-1,buf+8);
			p=str;
			while(*p && *p<=' ') p++;

			if(*p=='<') p++;				/* Skip '<' */
			tp=strchr(str,'>');				/* Truncate '>' */
			if(tp!=NULL) *tp=0;

			tp=strrchr(str,'@');
			if(state==SMTP_STATE_MAIL && tp!=NULL) {
				
				/* RELAY */
				sprintf(domain_list,"%sdomains.cfg",scfg.ctrl_dir);
				sprintf(relay_list,"%srelay.cfg",scfg.ctrl_dir);
				if(stricmp(tp+1,scfg.sys_inetaddr)!=0
					&& resolve_ip(tp+1)!=server_addr.sin_addr.s_addr
					&& findstr(&scfg,tp+1,domain_list)==FALSE) {

					if(!findstr(&scfg,host_name,relay_list) && 
						!findstr(&scfg,host_ip,relay_list)) {
						lprintf("%04d !SMTP ILLEGAL RELAY ATTEMPT from %s [%s] to %s"
							,socket, host_name, host_ip, tp+1);
						sockprintf(socket, "550 Relay not allowed.");
						continue;
					}

					lprintf("%04d SMTP Relaying to external mail service: %s"
						,socket, tp+1);

					fprintf(rcptlst,"0\n%.*s\n%.*s\n"
						,(int)sizeof(rcpt_name)-1,p
						,(int)sizeof(rcpt_addr)-1,p);
					
					sockprintf(socket,SMTP_OK);
					state=SMTP_STATE_RCPT;
					continue;
				}
			}
			*tp=0;	/* truncate at '@' */

			while(*p && !isalnum(*p)) p++;	/* Skip '<' or '"' */
			tp=strrchr(p,'"');	
			if(tp!=NULL) *tp=0;	/* truncate at '"' */

			p=alias(p,alias_buf);

											/* RX by sysop alias */
			if(!stricmp(p,"SYSOP") || !stricmp(p,scfg.sys_id) 
				|| !stricmp(p,"POSTMASTER") || !stricmp(p,scfg.sys_op))
				usernum=1;
			else 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 {
				usernum=matchuser(&scfg,p);	/* RX by "user alias", "user.alias" or "user_alias" */

				if(!usernum) { /* RX by "real name", "real.name", or "sysop.alias" */
					
					/* convert "user.name" to "user name" */
					sprintf(rcpt_name,"%.*s",sizeof(rcpt_name)-1,p);
					for(tp=rcpt_name;*tp;tp++)	
						if(*tp=='.') *tp=' ';

					if(!stricmp(rcpt_name,scfg.sys_op))
						usernum=1;			/* RX by "sysop.alias" */

					if(!usernum)			/* RX by "real name" */
						usernum=userdatdupe(&scfg, 0, U_NAME, LEN_NAME, p, FALSE);

					if(!usernum)			/* RX by "real.name" */
						usernum=userdatdupe(&scfg, 0, U_NAME, LEN_NAME, rcpt_name, FALSE);
				}
			}
			if(!usernum) {
				lprintf("%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("%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("%04d !SMTP DELETED or INACTIVE user #%u (%s)"
					,socket, usernum, p);
				sockprintf(socket, "550 Unknown User:%s", buf+8);
				continue;
			}
			if(state==SMTP_STATE_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("%04d !Attempt to send telegram to unavailable user #%u (%s)"
						,socket, user.number, user.alias);
					sockprintf(socket,"450 User unavailable");
					continue;
				}
			}
			if(state==SMTP_STATE_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%.*s\n",user.number,(int)sizeof(rcpt_name)-1,p);

			/* Forward to Internet */
			tp=strrchr(user.netmail,'@');
			if(!telegram
				&& scfg.sys_misc&SM_FWDTONET 
				&& user.misc&NETMAIL 
				&& tp && strchr(tp,'.') && !strchr(tp,'/') 
				&& !strstr(tp,scfg.sys_inetaddr)) {
				lprintf("%04d SMTP Forwarding to: %s"
					,socket, user.netmail);
				fprintf(rcptlst,"%s\n",user.netmail);
				sockprintf(socket,"251 User not local; will forward to %s", user.netmail);
			} else { /* Local (no-forward) */
				fprintf(rcptlst,"#%u\n",usernum);
				sockprintf(socket,SMTP_OK);
			}
			state=SMTP_STATE_RCPT;
			continue;
		}
		if(!strnicmp(buf,"DATA",4)) {
			if(state<SMTP_STATE_RCPT) {
				lprintf("%04d !SMTP MISSING 'RCPT TO' command", socket);
				sockprintf(socket, SMTP_BADSEQ);
				continue;
			}
			if(msgtxt!=NULL)
				fclose(msgtxt);
			sprintf(msgtxt_fname,"%sSMTP%d.RX", scfg.data_dir, socket);
			if((msgtxt=fopen(msgtxt_fname,"w+b"))==NULL) {
				lprintf("%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++;
			strcpy(sender_addr,p);
			p=strchr(sender_addr,'>');
			if(p!=NULL)
				*p=0;
			/* get sender */
			strcpy(sender,sender_addr);
			p=strchr(sender,'@');
			if(p!=NULL)
				*p=0;
			else
				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;
			continue;
		}
		sockprintf(socket,"500 Syntax error");
		lprintf("%04d !SMTP UNSUPPORTED COMMAND: '%s'", socket, buf);
	}

	/* Free up resources here */
	mail_close_socket(socket);

	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);

	lprintf("%04d SMTP RX Session thread terminated", socket);