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checksum tools: implement -c 

Signed-off-by: Hiltjo Posthuma <hiltjo@codemadness.org>
This commit is contained in:
Hiltjo Posthuma 2014-03-23 12:18:38 +01:00 committed by sin
parent 18b6e40161
commit 04f32f4d9a
6 changed files with 105 additions and 4 deletions
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1
crypt.h
View File

@ -6,6 +6,7 @@ struct crypt_ops {
void *s;
};
int cryptcheck(char *, int, char **, struct crypt_ops *, uint8_t *, size_t);
int cryptmain(int, char **, struct crypt_ops *, uint8_t *, size_t);
int cryptsum(struct crypt_ops *, FILE *, const char *, uint8_t *);
void mdprint(const uint8_t *, const char *, size_t);

6
md5sum.c
View File

@ -24,13 +24,17 @@ int
main(int argc, char *argv[])
{
uint8_t md[MD5_DIGEST_LENGTH];
char *checkfile = NULL;
ARGBEGIN {
case 'c':
eprintf("not implemented\n");
checkfile = EARGF(usage());
break;
default:
usage();
} ARGEND;
if(checkfile)
return cryptcheck(checkfile, argc, argv, &md5_ops, md, sizeof(md));
return cryptmain(argc, argv, &md5_ops, md, sizeof(md));
}

5
sha1sum.c
View File

@ -24,13 +24,16 @@ int
main(int argc, char *argv[])
{
uint8_t md[SHA1_DIGEST_LENGTH];
char *checkfile = NULL;
ARGBEGIN {
case 'c':
eprintf("not implemented\n");
checkfile = EARGF(usage());
default:
usage();
} ARGEND;
if(checkfile)
return cryptcheck(checkfile, argc, argv, &sha1_ops, md, sizeof(md));
return cryptmain(argc, argv, &sha1_ops, md, sizeof(md));
}

5
sha256sum.c
View File

@ -24,13 +24,16 @@ int
main(int argc, char *argv[])
{
uint8_t md[SHA256_DIGEST_LENGTH];
char *checkfile = NULL;
ARGBEGIN {
case 'c':
eprintf("not implemented\n");
checkfile = EARGF(usage());
default:
usage();
} ARGEND;
if(checkfile)
return cryptcheck(checkfile, argc, argv, &sha256_ops, md, sizeof(md));
return cryptmain(argc, argv, &sha256_ops, md, sizeof(md));
}

5
sha512sum.c
View File

@ -24,13 +24,16 @@ int
main(int argc, char *argv[])
{
uint8_t md[SHA512_DIGEST_LENGTH];
char *checkfile = NULL;
ARGBEGIN {
case 'c':
eprintf("not implemented\n");
checkfile = EARGF(usage());
default:
usage();
} ARGEND;
if(checkfile)
return cryptcheck(checkfile, argc, argv, &sha512_ops, md, sizeof(md));
return cryptmain(argc, argv, &sha512_ops, md, sizeof(md));
}

87
util/crypt.c
View File

@ -2,9 +2,96 @@
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "../util.h"
#include "../text.h"
#include "../crypt.h"
static int
hexdec(int c) {
if(c >= '0' && c <= '9')
return c - '0';
else if(c >= 'A' && c <= 'F')
return c - 'A' + 10;
else if(c >= 'a' && c <= 'f')
return c - 'a' + 10;
return -1; /* unknown character */
}
static int
mdcheckline(const char *s, uint8_t *md, size_t sz) {
size_t i;
int b1, b2;
for(i = 0; i < sz; i++) {
if(!*s || (b1 = hexdec(*s++)) < 0)
return -1; /* invalid format */
if(!*s || (b2 = hexdec(*s++)) < 0)
return -1; /* invalid format */
if((uint8_t)((b1 << 4) | b2) != md[i])
return 0; /* value mismatch */
}
return (i == sz) ? 1 : 0;
}
int
cryptcheck(char *sumfile, int argc, char *argv[],
struct crypt_ops *ops, uint8_t *md, size_t sz)
{
FILE *cfp, *fp;
char *buf = NULL, *line, *file, *p;
int r, nonmatch = 0, formatsucks = 0, noread = 0, ret = EXIT_SUCCESS;
size_t bufsiz = 0;
if(!(cfp = fopen(sumfile, "r")))
eprintf("fopen %s:", sumfile);
while((line = afgets(&buf, &bufsiz, cfp))) {
if(!(file = strstr(line, " "))) {
formatsucks++;
continue;
}
if((file - line) / 2 != sz) {
formatsucks++; /* checksum length mismatch */
continue;
}
*file = '\0';
file += 2;
for(p = file; *p && *p != '\n' && *p != '\r'; p++); /* strip newline */
*p = '\0';
if(!(fp = fopen(file, "r"))) {
weprintf("fopen %s:", file);
noread++;
continue;
}
cryptsum(ops, fp, file, md);
r = mdcheckline(line, md, sz);
if(r == 1) {
printf("%s: OK\n", file);
} else if(r == 0) {
printf("%s: FAILED\n", file);
nonmatch++;
} else {
formatsucks++;
}
fclose(fp);
}
fclose(cfp);
if(formatsucks > 0) {
weprintf("WARNING: %d lines are improperly formatted\n", formatsucks);
ret = EXIT_FAILURE;
}
if(noread > 0) {
weprintf("WARNING: %d listed file could not be read\n", noread);
ret = EXIT_FAILURE;
}
if(nonmatch > 0) {
weprintf("WARNING: %d computed checksums did NOT match\n", nonmatch);
ret = EXIT_FAILURE;
}
return ret;
}
int
cryptmain(int argc, char *argv[],
struct crypt_ops *ops, uint8_t *md, size_t sz)