static int getpwent_to_file(FILE *output) {
struct passwd result;
char *buffer;
size_t buflen = 1024;
int errnop;
enum nss_status ret;
_nss_cache_setpwent_path(PASSWD_FILE);
buffer = malloc(buflen);
do {
ret = _nss_cache_getpwent_r(&result, buffer, buflen, &errnop);
if (ret == NSS_STATUS_SUCCESS) {
fprintf(output, "%s:%s:%d:%d:%s:%s:%s\n", result.pw_name,
result.pw_passwd, result.pw_uid, result.pw_gid, result.pw_gecos,
result.pw_dir, result.pw_shell);
}
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 1;
}
} while (ret == NSS_STATUS_SUCCESS || ret == NSS_STATUS_TRYAGAIN);
free(buffer);
return 0;
}
static int getpwuid_wrapper(uid_t uid) {
struct passwd result;
char *buffer = NULL;
size_t buflen = 1024;
int found = 255;
int errnop;
int ret;
_nss_cache_setpwent_path(PASSWD_FILE);
buffer = malloc(buflen);
do {
ret = _nss_cache_getpwuid_r(uid, &result, buffer, buflen, &errnop);
if (ret == NSS_STATUS_SUCCESS) {
// printf("found %s, %d\n", result.pw_name, result.pw_uid);
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;
}
static int getspent_to_file(FILE *output) {
struct spwd result;
char *buffer;
size_t buflen = 1024;
int errnop;
enum nss_status ret;
_nss_cache_setpwent_path(SHADOW_FILE);
buffer = malloc(buflen);
do {
ret = _nss_cache_getspent_r(&result, buffer, buflen, &errnop);
if (ret == NSS_STATUS_SUCCESS) {
fprintf(output, "%s:%s:", result.sp_namp, result.sp_pwdp);
// sigh, empty numberical fields are -1 in the struct,
// so if necessary convert back to empty fields
if (result.sp_lstchg != -1) {
fprintf(output, "%ld:", result.sp_lstchg);
} else {
fprintf(output, ":");
}
if (result.sp_min != -1) {
fprintf(output, "%ld:", result.sp_min);
} else {
fprintf(output, ":");
}
if (result.sp_max != -1) {
fprintf(output, "%ld:", result.sp_max);
} else {
fprintf(output, ":");
}
if (result.sp_warn != -1) {
fprintf(output, "%ld:", result.sp_warn);
} else {
fprintf(output, ":");
}
if (result.sp_inact != -1) {
fprintf(output, "%ld:", result.sp_inact);
} else {
fprintf(output, ":");
}
if (result.sp_expire != -1) {
fprintf(output, "%ld:", result.sp_expire);
} else {
fprintf(output, ":");
}
if (result.sp_flag != -1) {
fprintf(output, "%ld", result.sp_flag);
}
fprintf(output, "\n");
}
if (ret == NSS_STATUS_TRYAGAIN) {
buflen = buflen * 2;
buffer = realloc(buffer, buflen);
}
if (ret == NSS_STATUS_UNAVAIL) {
perror("ERROR: failed to access shadow test data");
return 1;
}
} while (ret == NSS_STATUS_SUCCESS || ret == NSS_STATUS_TRYAGAIN);
free(buffer);
return 0;
}