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/* (C) Copyright 1993,1994 by Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without
* fee, provided that the above copyright notice appear in all copies
* and that both that copyright notice and this permission notice
* appear in supporting documentation, and that the name of Carnegie
* Mellon University not be used in advertising or publicity
* pertaining to distribution of the software without specific,
* written prior permission. Carnegie Mellon University makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "mpack.h"
#include "md5.h"
static char basis_64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static void output64chunk (int c1, int c2, int c3, int pads, FILE *outfile)
{
putc(basis_64[c1>>2], outfile);
putc(basis_64[((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4)], outfile);
if (pads == 2) {
putc('=', outfile);
putc('=', outfile);
} else if (pads) {
putc(basis_64[((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)], outfile);
putc('=', outfile);
} else {
putc(basis_64[((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6)], outfile);
putc(basis_64[c3 & 0x3F], outfile);
}
}
static int to64 (FILE *infile, FILE *outfile)
{
int c1, c2, c3, ct=0, written=0;
while ((c1 = getc(infile)) != EOF) {
c2 = getc(infile);
if (c2 == EOF) {
output64chunk(c1, 0, 0, 2, outfile);
} else {
c3 = getc(infile);
if (c3 == EOF) {
output64chunk(c1, c2, 0, 1, outfile);
} else {
output64chunk(c1, c2, c3, 0, outfile);
}
}
ct += 4;
if (ct > 71) {
putc('\n', outfile);
written += 73;
ct = 0;
}
}
if (ct) {
putc('\n', outfile);
ct++;
}
return written + ct;
}
static void md5contextTo64 (MD5_CTX *context, char *encodedDigest)
{
unsigned char digest[18];
int i;
char *p;
MD5Final(digest, context);
digest[sizeof(digest)-1] = digest[sizeof(digest)-2] = 0;
p = encodedDigest;
for (i=0; i < sizeof(digest); i+=3) {
*p++ = basis_64[digest[i]>>2];
*p++ = basis_64[((digest[i] & 0x3)<<4) | ((digest[i+1] & 0xF0)>>4)];
*p++ = basis_64[((digest[i+1] & 0xF)<<2) | ((digest[i+2] & 0xC0)>>6)];
*p++ = basis_64[digest[i+2] & 0x3F];
}
*p-- = '\0';
*p-- = '=';
*p-- = '=';
}
static void md5digest (FILE *infile, char *digest)
{
MD5_CTX context;
unsigned char buf[1000];
int nbytes;
MD5Init(&context);
while ((nbytes = fread(buf, 1, sizeof(buf), infile))) {
MD5Update(&context, buf, nbytes);
}
rewind(infile);
md5contextTo64(&context, digest);
}
/* Encode a file into a MIME message */
int mpack_encode (FILE *fpin, const char *fname, const char *note,
const char *subject, const char *recipient,
const char *reply_to, const char *type,
FILE *fpout)
{
const char *cleanfname, *p;
char digest[25];
/* Clean up fname for printing */
cleanfname = fname;
if ((p = strrchr(cleanfname, '/')) != NULL) cleanfname = p+1;
if ((p = strrchr(cleanfname, '\\')) != NULL) cleanfname = p+1;
if ((p = strrchr(cleanfname, ':')) != NULL) cleanfname = p+1;
/* Compute MD5 digests */
md5digest(fpin, digest);
fprintf(fpout, "Mime-Version: 1.0\n");
fprintf(fpout, "From: %s\n", reply_to);
fprintf(fpout, "To: %s\n", recipient);
fprintf(fpout, "Subject: %s\n", subject);
fputs("Content-Type: multipart/mixed; boundary=\"-\"\n", fpout);
fputs("\nThis is a MIME encoded message.\n\n", fpout);
/* description section */
if (note != NULL) {
fputs("---\n\n", fpout);
fputs(note, fpout);
fputc('\n', fpout);
}
fputs("---\n", fpout);
fprintf(fpout, "Content-Type: %s; name=\"%s\"\n", type,
cleanfname);
fputs("Content-Transfer-Encoding: base64\n", fpout);
fprintf(fpout, "Content-Disposition: inline; filename=\"%s\"\n",
cleanfname);
fprintf(fpout, "Content-MD5: %s\n\n", digest);
to64(fpin, fpout);
fputs("\n-----\n", fpout);
return 0;
}
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