1#define _GNU_SOURCE
2#include "pwf.h"
3#include <grp.h>
4#include <string.h>
5#include <limits.h>
6#include <stdio.h>
7#include <stdlib.h>
8#include <byteswap.h>
9#include <errno.h>
10#include "nscd.h"
11
12int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
13{
14	int rv, nlim, ret = -1;
15	ssize_t i, n = 1;
16	struct group gr;
17	struct group *res;
18	FILE *f;
19	int swap = 0;
20	int32_t resp[INITGR_LEN];
21	uint32_t *nscdbuf = 0;
22	char *buf = 0;
23	char **mem = 0;
24	size_t nmem = 0;
25	size_t size;
26	nlim = *ngroups;
27	if (nlim >= 1) *groups++ = gid;
28
29	f = __nscd_query(GETINITGR, user, resp, sizeof resp, &swap);
30	if (!f) goto cleanup;
31	if (resp[INITGRFOUND]) {
32		nscdbuf = calloc(resp[INITGRNGRPS], sizeof(uint32_t));
33		if (!nscdbuf) goto cleanup;
34		if (!fread(nscdbuf, sizeof(*nscdbuf)*resp[INITGRNGRPS], 1, f)) {
35			if (!ferror(f)) errno = EIO;
36			goto cleanup;
37		}
38		if (swap) {
39			for (i = 0; i < resp[INITGRNGRPS]; i++)
40				nscdbuf[i] = bswap_32(nscdbuf[i]);
41		}
42	}
43	fclose(f);
44
45	f = fopen("/etc/group", "rbe");
46	if (!f && errno != ENOENT && errno != ENOTDIR)
47		goto cleanup;
48
49	if (f) {
50		while (!(rv = __getgrent_a(f, &gr, &buf, &size, &mem, &nmem, &res)) && res) {
51			if (nscdbuf)
52				for (i=0; i < resp[INITGRNGRPS]; i++) {
53					if (nscdbuf[i] == gr.gr_gid) nscdbuf[i] = gid;
54				}
55			for (i=0; gr.gr_mem[i] && strcmp(user, gr.gr_mem[i]); i++);
56			if (!gr.gr_mem[i]) continue;
57			if (++n <= nlim) *groups++ = gr.gr_gid;
58		}
59		if (rv) {
60			errno = rv;
61			goto cleanup;
62		}
63	}
64	if (nscdbuf) {
65		for(i=0; i < resp[INITGRNGRPS]; i++) {
66			if (nscdbuf[i] != gid)
67				if(++n <= nlim) *groups++ = nscdbuf[i];
68		}
69	}
70
71	ret = n > nlim ? -1 : n;
72	*ngroups = n;
73
74cleanup:
75	if (f) fclose(f);
76	free(nscdbuf);
77	free(buf);
78	free(mem);
79	return ret;
80}
81