/** Calculates a file's MD5 or SHA2 digest and compares it to an expected value.
* @param filepath path of the file to check
* @param expected hash value to compare against
* @param type digest type to use
* @return 0 if file matches the expected hash, 1 if they do not match, -1 on
* error
*/
int _alpm_test_checksum(const char *filepath, const char *expected,
alpm_pkgvalidation_t type)
{
char *computed;
int ret;
if(type == ALPM_PKG_VALIDATION_MD5SUM) {
computed = alpm_compute_md5sum(filepath);
} else if(type == ALPM_PKG_VALIDATION_SHA256SUM) {
computed = alpm_compute_sha256sum(filepath);
} else {
return -1;
}
if(expected == NULL || computed == NULL) {
ret = -1;
} else if(strcmp(expected, computed) != 0) {
ret = 1;
} else {
ret = 0;
}
FREE(computed);
return ret;
}
static int check_sha256sum(alpm_pkg_t *pkg)
{
int ret = 0;
char path[PATH_MAX], *rel;
pu_mtree_reader_t *reader;
pu_mtree_t *m;
if((reader = pu_mtree_reader_open_package(handle, pkg)) == NULL) {
pu_ui_warn("%s: mtree data not available (%s)",
alpm_pkg_get_name(pkg), strerror(errno));
return require_mtree;
}
strcpy(path, alpm_option_get_root(handle));
rel = path + strlen(alpm_option_get_root(handle));
if((m = pu_mtree_new()) == NULL) {
pu_ui_warn("%s: error reading mtree data (%s)",
alpm_pkg_get_name(pkg), strerror(errno));
pu_mtree_reader_free(reader);
return require_mtree;
}
while(pu_mtree_reader_next(reader, m)) {
char *sha;
if(m->sha256digest[0] == '\0') { continue; }
if(m->path[0] == '.') { continue; }
if(skip_backups && match_backup(pkg, m->path)) { continue; }
if(skip_noextract && match_noextract(handle, m->path)) { continue; }
if(skip_noupgrade && match_noupgrade(handle, m->path)) { continue; }
strcpy(rel, m->path);
if((sha = alpm_compute_sha256sum(path)) == NULL) {
pu_ui_warn("%s: '%s' read error (%s)",
alpm_pkg_get_name(pkg), path, strerror(errno));
} else if(memcmp(m->sha256digest, sha, 32) != 0) {
eprintf("%s: '%s' sha256sum mismatch (expected %s)\n",
alpm_pkg_get_name(pkg), path, m->sha256digest);
ret = 1;
}
free(sha);
}
pu_mtree_free(m);
if(!reader->eof) {
pu_ui_warn("%s: error reading mtree data (%s)",
alpm_pkg_get_name(pkg), strerror(errno));
pu_mtree_reader_free(reader);
return ret || require_mtree;
}
pu_mtree_reader_free(reader);
if(!quiet && !ret) {
eprintf("%s: all files match mtree sha256sums\n", alpm_pkg_get_name(pkg));
}
return ret;
}