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/* $Id$ */
/****************************************************************************
* @format.tab-size 4 (Plain Text/Source Code File Header) *
* @format.use-tabs true (see http://www.synchro.net/ptsc_hdr.html) *
* *
* Copyright 2000 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. *
****************************************************************************/
/* See RFCs 1521,2045,2046,2047,2048,2049,1590 */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "sbbs.h"
#include "mailsrvr.h"
#define SIZEOF_MIMEBOUNDARY 36
#define BASE64_BITMASK 0x0000003F
static const char * base64alphabet =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
static void tobase64(char * in, char * out, int bytesread);
char * mimegetboundary()
{
int i, num;
char * boundaryString = (char *)malloc(SIZEOF_MIMEBOUNDARY + 1);
srand(time(NULL));
if (boundaryString == NULL)
return NULL;
for (i=0;i<SIZEOF_MIMEBOUNDARY;i++) {
num=(rand()%62);
if(num<10)
num+=48;
else if(num>=10 && num<36)
num+=55;
else
num+=61;
boundaryString[i]=(char)num;
}
boundaryString[i]='\0';
return boundaryString;
}
void mimeheaders(SOCKET socket, char * boundary)
{
char bndline[50];
sockprintf(socket,"MIME-Version: 1.0");
sockprintf(socket,"Content-Type: multipart/mixed;");
strcpy(bndline," boundary=\"");
strcat(bndline,boundary);
strcat(bndline,"\"");
sockprintf(socket,bndline);
}
void mimeblurb(SOCKET socket, char * boundary)
{
sockprintf(socket,"This is a MIME blurb. You shouldn't be seeing this!");
sockprintf(socket,"");
}
void mimetextpartheader(SOCKET socket, char * boundary)
{
char bndline[50];
strcpy(bndline,"--");
strcat(bndline,boundary);
sockprintf(socket,bndline);
sockprintf(socket,"Content-Type: text/plain;");
sockprintf(socket," charset=\"iso-8859-1\"");
sockprintf(socket,"Content-Transfer-Encoding: 7bit");
}
BOOL base64out(SOCKET socket, char * pathfile)
{
FILE * fp;
char in[3]={0};
char out[5]; /* one for the '\0' */
char line[77]; /* one for the '\0' */
int bytesread;
int i = 0;
if((fp=fopen(pathfile,"rb"))==NULL)
return(FALSE);
while(1) {
bytesread=fread(in,1,3,fp);
tobase64(in,out,bytesread);
if(i==0)
strcpy(line,out);
else
strcat(line,out);
if(i==18) {
sockprintf(socket,line);
i=-1;
}
if(bytesread!=3 || feof(fp))
break;
i++;
memset(in,0,3);
}
if(i!=-1) /* already printed the last line */
sockprintf(socket,line);
sockprintf(socket,"");
fclose(fp);
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return(TRUE);
}
BOOL mimeattach(SOCKET socket, char * boundary, char * pathfile)
{
char bndline[41];
char * fname = getfname(pathfile);
char * line = (char*)MALLOC(strlen(fname) + 20);
if(line==NULL)
return(FALSE);
strcpy(bndline,"--");
strcat(bndline,boundary);
sockprintf(socket,bndline);
sockprintf(socket,"Content-Type: application/octet-stream;");
strcpy(line," name=\"");
strcat(line,fname);
strcat(line,"\"");
sockprintf(socket,line);
sockprintf(socket,"Content-Transfer-Encoding: base64");
sockprintf(socket,"Content-Disposition: attachment;");
strcpy(line," filename=\"");
strcat(line,fname);
strcat(line,"\"");
sockprintf(socket,line);
sockprintf(socket,"");
if(!base64out(socket,pathfile))
return(FALSE);
sockprintf(socket,"");
FREE(line);
return(TRUE);
}
void endmime(SOCKET socket, char * boundary)
{
char bndline[41];
strcpy(bndline,"--");
strcat(bndline,boundary);
strcat(bndline,"--"); /* last boundary */
sockprintf(socket,bndline);
sockprintf(socket,"");
}
static void tobase64(char * in, char * out, int bytesread)
{
#define BITCAST_MASK 0x000000FF
unsigned int tmpnum0 = ((unsigned int)in[0])&BITCAST_MASK;
unsigned int tmpnum1 = ((unsigned int)in[1])&BITCAST_MASK;
unsigned int data = ((unsigned int)in[2])&BITCAST_MASK;
data|=(tmpnum1<<8);
data|=(tmpnum0<<16);
if(bytesread==0) {
out[0]='\0';
return;
}
out[4]='\0';
out[3]=base64alphabet[(data&BASE64_BITMASK)];
out[2]=base64alphabet[((data>>6)&BASE64_BITMASK)];
out[1]=base64alphabet[((data>>12)&BASE64_BITMASK)];
out[0]=base64alphabet[((data>>18)&BASE64_BITMASK)];
if(bytesread==1) {
/* pad last bytes */
out[3]=base64alphabet[64];
out[2]=base64alphabet[64];
}
else if(bytesread==2)
out[3]=base64alphabet[64];
#undef BITCAST_MASK
}