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/*
* md5sum.c - Generate/check MD5 Message Digests
*
* Compile and link with md5.c. If you don't have getopt() in your library
* also include getopt.c. For MSDOS you can also link with the wildcard
* initialization function (wildargs.obj for Turbo C and setargv.obj for MSC)
* so that you can use wildcards on the commandline.
*
* Written March 1993 by Branko Lankester
* Modified June 1993 by Colin Plumb for altered md5.c.
*/
#include <stdio.h>
#include <string.h>
#include "md5.h"
#ifdef UNIX
#define FOPRTXT "r"
#define FOPRBIN "r"
#else
#ifdef VMS
#define FOPRTXT "r","ctx=stm"
#define FOPRBIN "rb","ctx=stm"
#else
#define FOPRTXT "r"
#define FOPRBIN "rb"
#endif
#endif
extern char *optarg;
extern int optind;
void usage();
void print_digest();
int mdfile(FILE *fp, unsigned char *digest);
int do_check(FILE *chkf);
char *progname;
int verbose = 0;
int bin_mode = 0;
void
main(int argc, char **argv)
{
int opt, rc = 0;
int check = 0;
FILE *fp;
unsigned char digest[16];
progname = *argv;
while ((opt = getopt(argc, argv, "cbvp:h")) != EOF) {
switch (opt) {
case 'c': check = 1; break;
case 'v': verbose = 1; break;
case 'b': bin_mode = 1; break;
default: usage();
}
}
argc -= optind;
argv += optind;
if (check) {
switch (argc) {
case 0: fp = stdin; break;
case 1: if ((fp = fopen(*argv, FOPRTXT)) == NULL) {
perror(*argv);
exit(2);
}
break;
default: usage();
}
exit(do_check(fp));
}
if (argc == 0) {
if (mdfile(stdin, digest)) {
fprintf(stderr, "%s: read error on stdin\n", progname);
exit(2);
}
print_digest(digest);
printf("\n");
exit(0);
}
for ( ; argc > 0; --argc, ++argv) {
if (bin_mode)
fp = fopen(*argv, FOPRBIN);
else
fp = fopen(*argv, FOPRTXT);
if (fp == NULL) {
perror(*argv);
rc = 2;
continue;
}
if (mdfile(fp, digest)) {
fprintf(stderr, "%s: error reading %s\n", progname, *argv);
rc = 2;
} else {
print_digest(digest);
printf(" %c%s\n", bin_mode ? '*' : ' ', *argv);
}
fclose(fp);
}
exit(rc);
}
void
usage()
{
fprintf(stderr, "usage: md5sum [-bv] [-c [file]] | [file...]\n");
fprintf(stderr, "Generates or checks MD5 Message Digests\n");
fprintf(stderr, " -c check message digests (default is generate)\n");
fprintf(stderr, " -v verbose, print file names when checking\n");
fprintf(stderr, " -b read files in binary mode\n");
fprintf(stderr, "The input for -c should be the list of message digests and file names\n");
fprintf(stderr, "that is printed on stdout by this program when it generates digests.\n");
exit(2);
}
int
mdfile(FILE *fp, unsigned char *digest)
{
unsigned char buf[1024];
MD5_CTX ctx;
int n;
MD5Init(&ctx);
while ((n = fread(buf, 1, sizeof(buf), fp)) > 0)
MD5Update(&ctx, buf, n);
MD5Final(digest, &ctx);
if (ferror(fp))
return -1;
return 0;
}
void
print_digest(unsigned char *p)
{
int i;
for (i = 0; i < 16; ++i)
printf("%02x", *p++);
}
int
hex_digit(int c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
return -1;
}
int
get_md5_line(FILE *fp, unsigned char *digest, char *file)
{
char buf[1024];
int i, d1, d2, rc;
char *p = buf;
if (fgets(buf, sizeof(buf), fp) == NULL)
return -1;
for (i = 0; i < 16; ++i) {
if ((d1 = hex_digit(*p++)) == -1)
return 0;
if ((d2 = hex_digit(*p++)) == -1)
return 0;
*digest++ = d1*16 + d2;
}
if (*p++ != ' ')
return 0;
/*
* next char is an attribute char, space means text file
* if it's a '*' the file should be checked in binary mode.
*/
if (*p == ' ')
rc = 1;
else if (*p == '*')
rc = 2;
else {
fprintf(stderr, "%s: unrecognized line: %s", progname, buf);
return 0;
}
++p;
i = strlen(p);
if (i < 2 || i > 255)
return 0;
p[i-1] = '\0';
strcpy(file, p);
return rc;
}
int
do_check(FILE *chkf)
{
int rc, ex = 0, failed = 0, checked = 0;
unsigned char chk_digest[16], file_digest[16];
char filename[256];
FILE *fp;
int flen = 14;
while ((rc = get_md5_line(chkf, chk_digest, filename)) >= 0) {
if (rc == 0) /* not an md5 line */
continue;
if (verbose) {
if (strlen(filename) > flen)
flen = strlen(filename);
fprintf(stderr, "%-*s ", flen, filename);
}
if (bin_mode || rc == 2)
fp = fopen(filename, FOPRBIN);
else
fp = fopen(filename, FOPRTXT);
if (fp == NULL) {
fprintf(stderr, "%s: can't open %s\n", progname, filename);
ex = 2;
continue;
}
if (mdfile(fp, file_digest)) {
fprintf(stderr, "%s: error reading %s\n", progname, filename);
ex = 2;
fclose(fp);
continue;
}
fclose(fp);
if (memcmp(chk_digest, file_digest, 16) != 0) {
if (verbose)
fprintf(stderr, "FAILED\n");
else
fprintf(stderr, "%s: MD5 check failed for '%s'\n", progname, filename);
++failed;
} else if (verbose)
fprintf(stderr, "OK\n");
++checked;
}
if (verbose && failed)
fprintf(stderr, "%s: %d of %d file(s) failed MD5 check\n", progname, failed, checked);
if (!checked) {
fprintf(stderr, "%s: no files checked\n", progname);
return 3;
}
if (!ex && failed)
ex = 1;
return ex;
}
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