#include <config.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#if defined(HAVE_STDINT_H)
# include <stdint.h>
#elif defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#endif
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "sudoers.h"
#include "sudo_digest.h"
unsigned char *
sudo_filedigest(int fd, const char *file, int digest_type, size_t *digest_len)
{
unsigned char *file_digest = NULL;
unsigned char buf[32 * 1024];
struct sudo_digest *dig = NULL;
FILE *fp = NULL;
size_t nread;
int fd2;
debug_decl(sudo_filedigest, SUDOERS_DEBUG_UTIL)
*digest_len = sudo_digest_getlen(digest_type);
if (*digest_len == (size_t)-1) {
sudo_warnx(U_("unsupported digest type %d for %s"), digest_type, file);
goto bad;
}
if ((dig = sudo_digest_alloc(digest_type)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
if ((fd2 = dup(fd)) == -1) {
sudo_debug_printf(SUDO_DEBUG_INFO, "unable to dup %s: %s",
file, strerror(errno));
goto bad;
}
if ((fp = fdopen(fd2, "r")) == NULL) {
sudo_debug_printf(SUDO_DEBUG_INFO, "unable to fdopen %s: %s",
file, strerror(errno));
close(fd2);
goto bad;
}
if ((file_digest = malloc(*digest_len)) == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
goto bad;
}
while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
sudo_digest_update(dig, buf, nread);
}
if (ferror(fp)) {
sudo_warnx(U_("%s: read error"), file);
goto bad;
}
sudo_digest_final(dig, file_digest);
sudo_digest_free(dig);
fclose(fp);
debug_return_ptr(file_digest);
bad:
sudo_digest_free(dig);
free(file_digest);
if (fp != NULL)
fclose(fp);
debug_return_ptr(NULL);
}