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