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/*
* jigsum-sha256
*
* Tool to calculate and print SHA256 checksums in jigdo's awkward
* base64-ish encoding.
*
* Copyright (c) 2019 Steve McIntyre <steve@einval.com>
*
* GPL v2 - see COPYING
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include "jig-base64.h"
#include "sha256.h"
#define BUF_SIZE 65536
/* SHA256 is 256-bit! */
#define CKSUM_BITS 256
#define CKSUM_BYTES (CKSUM_BITS / 8)
#define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
#define BASE64_CKSUM_BYTES ((ROUND_UP (CKSUM_BITS, 6)) / 6)
#ifndef MIN
#define MIN(x,y) ( ((x) < (y)) ? (x) : (y))
#endif
enum mode_e
{
MODE_CHECK,
MODE_CALC
};
static int sha256_file(char *filename, char *sha256, int verbose)
{
FILE *file = NULL;
char buf[BUF_SIZE];
unsigned char file_sha256[CKSUM_BYTES] = {0};
char *base64_sha256 = NULL;
struct sha256_ctx file_context;
int done = 0;
int bytes_read = 0;
int error = 0;
off_t file_size = -1;
sha256_init_ctx(&file_context);
/* Check if we're reading from stdin */
if (!strcmp("-", filename))
file = stdin;
else
{
file = fopen(filename, "rb");
if (!file)
{
switch (errno)
{
case EACCES:
case EISDIR:
break;
default:
fprintf(stderr, "Unable to open file %s; error %d\n", filename, errno);
break;
}
return errno;
}
}
if (verbose == 3)
{
fprintf(stderr, "Checking %s:\r", filename);
fflush(stdout);
}
if (verbose == 4)
{
struct stat st;
if (file != stdin)
{
stat(filename, &st);
file_size = st.st_size;
fprintf(stderr, "Checking %s: 0 / %lld bytes\r", filename, (long long)file_size);
}
else
{
fprintf(stderr, "Checking stdin: 0 bytes\r");
}
fflush(stdout);
}
while (!done)
{
int used = 0;
memset(buf, 0, BUF_SIZE);
used = fread(buf, 1, BUF_SIZE, file);
bytes_read += used;
if (used)
sha256_process_bytes((unsigned char *)buf, used, &file_context);
else
{
if (ferror(file) && (EISDIR != errno))
{
fprintf(stderr, "Unable to read from file %s; error %d\n",
filename, errno);
error = errno;
}
break;
}
if (verbose == 4)
{
if (file != stdin)
fprintf(stderr, "Checking %s: %lld / %lld bytes\r",
filename, (long long) bytes_read, (long long)file_size);
else
fprintf(stderr, "Checking stdin: %lld bytes\r", (long long) bytes_read);
fflush(stdout);
}
}
if (verbose == 4)
fprintf(stderr, "\n");
sha256_finish_ctx(&file_context, file_sha256);
base64_sha256 = base64_dump(file_sha256, CKSUM_BYTES);
memcpy(sha256, base64_sha256, BASE64_CKSUM_BYTES + 1);
fflush(stdout);
free(base64_sha256);
if (file != stdin)
fclose(file);
return error;
}
static int sha256_check(char *filename, int verbose)
{
FILE *file = NULL;
char *line = NULL;
size_t len = 0;
ssize_t read;
char base64_sha256[BASE64_CKSUM_BYTES + 1] = {0};
int error = 0;
/* Check if we're reading from stdin */
if (!strcmp("-", filename))
file = stdin;
else
{
file = fopen(filename, "rb");
if (!file)
{
switch (errno)
{
case EACCES:
case EISDIR:
break;
default:
fprintf(stderr, "Unable to open file %s; error %d\n", filename, errno);
break;
}
return errno;
}
}
while ((read = getline(&line, &len, file)) != -1) {
/* Check the format of the line we've read. Should be:
<N chars of sum><SPACE><SPACE><filename>
where N == BASE64_CKSUM_BYTES
Look for the spaces and length at least. Use the strings
directly in the buffer, add pointers to them in place.
*/
char *this_sha256;
char *this_filename;
int this_error = 0;
if (read > (BASE64_CKSUM_BYTES + 2)
&& line[BASE64_CKSUM_BYTES] == ' '
&& line[BASE64_CKSUM_BYTES + 1] == ' ')
{
line[BASE64_CKSUM_BYTES] = 0;
this_sha256 = line;
this_filename = &line[BASE64_CKSUM_BYTES + 2];
if (line[read - 1] == '\n')
line[--read] = '\0';
this_error = sha256_file(this_filename, base64_sha256, verbose);
if (this_error)
{
fprintf(stderr, "Failed to read %s, error %d (%s)\n",
this_filename, this_error, strerror(errno));
}
else
{
if (strcmp(base64_sha256, this_sha256))
{
if (verbose > 0)
fprintf(stderr, "FAILED: %s\n", this_filename);
this_error++;
}
else
{
if (verbose > 1)
fprintf(stderr, "OK: %s\n", this_filename);
}
}
}
else
{
printf("ignoring malformed line %s\n", line);
}
error += this_error;
}
if (file != stdin)
fclose(file);
return error;
}
int main(int argc, char **argv)
{
int i = 0;
char base64_sha256[BASE64_CKSUM_BYTES];
enum mode_e mode = MODE_CALC;
int verbose = 1;
int c = -1;
int error = 0;
while(1)
{
c = getopt(argc, argv, "cv");
if (-1 == c)
break;
switch(c)
{
case 'v':
verbose++;
break;
case 'c':
mode = MODE_CHECK;
break;
}
}
if (mode == MODE_CALC)
{
if (argc == optind)
{
if (!sha256_file("-", base64_sha256, verbose))
printf("%s %s\n", base64_sha256, "-");
}
else
{
for (i = optind; i < argc; i++)
{
if (!sha256_file(argv[i], base64_sha256, verbose))
printf("%s %s\n", base64_sha256, argv[i]);
fflush(stdout);
}
}
}
else
{
if (argc == optind)
{
error += sha256_check("-", verbose);
}
else
{
for (i = optind; i < argc; i++)
error += sha256_check(argv[i], verbose);
}
}
return error;
}
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