static int getgrent_to_file(FILE *output) {
struct group result;
char *buffer;
size_t buflen = 1024;
int errnop;
enum nss_status ret;
int idx;
_nss_cache_setgrent_path(GROUP_FILE);
buffer = malloc(buflen);
do {
ret = _nss_cache_getgrent_r(&result, buffer, buflen, &errnop);
if (ret == NSS_STATUS_SUCCESS) {
fprintf(output, "%s:%s:%d:",
result.gr_name,
result.gr_passwd,
result.gr_gid
);
// unroll **gr_mem
for (idx = 0; result.gr_mem[idx] != NULL; idx++) {
fprintf(output, "%s", result.gr_mem[idx]);
if (result.gr_mem[idx+1] != NULL) {
fprintf(output, ",");
}
}
fprintf(output, "\n");
}
if (ret == NSS_STATUS_TRYAGAIN) {
buflen = buflen * 2;
buffer = realloc(buffer, buflen);
}
if (ret == NSS_STATUS_UNAVAIL) {
fprintf(stderr, "ERROR: failed to access group test data\n");
return 1;
}
} while (ret == NSS_STATUS_SUCCESS || ret == NSS_STATUS_TRYAGAIN);
free(buffer);
return 0;
}
static int getgrgid_wrapper(gid_t gid) {
struct group result;
char *buffer = NULL;
size_t buflen = 1024;
int found = 255;
int errnop;
int ret;
_nss_cache_setgrent_path(GROUP_FILE);
buffer = malloc(buflen);
do {
ret = _nss_cache_getgrgid_r(gid, &result, buffer, buflen, &errnop);
if (ret == NSS_STATUS_SUCCESS) {
// printf("found %s, %d\n", result.gr_name, result.gr_gid);
found = 0;
}
if (ret == NSS_STATUS_NOTFOUND) {
found = 1;
}
if (ret == NSS_STATUS_TRYAGAIN) {
buflen = buflen * 2;
buffer = realloc(buffer, buflen);
}
if (ret == NSS_STATUS_UNAVAIL) {
fprintf(stderr, "ERROR: failed to access passwd test data\n");
return 2;
}
} while (ret == NSS_STATUS_TRYAGAIN);
free(buffer);
return found;
}
