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
getgrouplist(const char * user,gid_t gid,gid_t * groups,int * ngroups)12 int 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
74 cleanup:
75 if (f) fclose(f);
76 free(nscdbuf);
77 free(buf);
78 free(mem);
79 return ret;
80 }
81