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/**
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Author: Nikki VonHollen <vonhollen@gmail.com>
*/
#include <grp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#define GROUP_CONFIG_KEY "MOCK_GROUP"
static FILE *global_stream = NULL;
void setgrent(void) {
if (global_stream)
endgrent();
const char *path = getenv(GROUP_CONFIG_KEY);
if (!path)
return;
global_stream = fopen(path, "r");
}
struct group *getgrent(void) {
if (!global_stream)
setgrent();
if (!global_stream)
return NULL;
return fgetgrent(global_stream);
}
void endgrent(void) {
if (!global_stream)
return;
fclose(global_stream);
global_stream = NULL;
}
struct group *getgrnam(const char *name) {
const char *path = getenv(GROUP_CONFIG_KEY);
if (!path)
return NULL;
FILE *stream = fopen(path, "r");
if (!stream)
return NULL;
struct group *entry;
while ((entry = fgetgrent(stream))) {
if (strcmp(entry->gr_name, name) == 0) {
fclose(stream);
return entry;
}
}
fclose(stream);
return NULL;
}
struct group *getgrgid(gid_t gid) {
const char *path = getenv(GROUP_CONFIG_KEY);
if (!path)
return NULL;
FILE *stream = fopen(path, "r");
if (!stream)
return NULL;
struct group *entry;
while ((entry = fgetgrent(stream))) {
if (entry->gr_gid == gid) {
fclose(stream);
return entry;
}
}
fclose(stream);
return NULL;
}
int getgrouplist(const char *user, gid_t group, gid_t *groups, int *ngroups) {
const char *path = getenv(GROUP_CONFIG_KEY);
if (!path) {
*ngroups = 0;
return -1;
}
FILE *stream = fopen(path, "r");
if (!stream) {
*ngroups = 0;
return -1;
}
int default_group_found = 0;
int groups_found = 0;
// Loop through all groups
struct group *entry;
while ((entry = fgetgrent(stream))) {
// Loop through all users in group
char **cur_user;
for (cur_user = entry->gr_mem; *cur_user; cur_user++) {
// Skip users who don't match arg 'user'
if (strcmp(*cur_user, user))
continue;
// Is this the default group? if so, flag it
if (entry->gr_gid == group)
default_group_found = 1;
// Only insert new entries if we have room
if (groups_found < *ngroups) {
groups[groups_found] = entry->gr_gid;
}
groups_found++;
}
}
// Include the default group if it wasn't found
if (!default_group_found) {
if (groups_found < *ngroups) {
groups[groups_found] = group;
}
groups_found++;
}
// Did we have to leave out some groups? If not, tell how many we found.
int retval = (groups_found > *ngroups) ? -1 : groups_found;
// Always tell the user how many groups we found via *ngroups
*ngroups = groups_found;
fclose(stream);
return retval;
}
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