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32c075e1 | 1 | /* Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
f7e7a396 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <assert.h> | |
21 | #include <errno.h> | |
22 | #include <grp.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <not-cancel.h> | |
27 | ||
28 | #include "nscd-client.h" | |
29 | #include "nscd_proto.h" | |
30 | ||
31 | ||
ed2ced8a | 32 | /* We use the same mapping as in nscd_getgr. */ |
6f8a7dff | 33 | libc_locked_map_ptr (extern, __gr_map_handle) attribute_hidden; |
f7e7a396 UD |
34 | |
35 | ||
36 | int | |
37 | __nscd_getgrouplist (const char *user, gid_t group, long int *size, | |
38 | gid_t **groupsp, long int limit) | |
39 | { | |
40 | size_t userlen = strlen (user) + 1; | |
0891f970 | 41 | int gc_cycle; |
32c075e1 | 42 | int nretries = 0; |
0891f970 UD |
43 | |
44 | /* If the mapping is available, try to search there instead of | |
45 | communicating with the nscd. */ | |
46 | struct mapped_database *mapped; | |
ed2ced8a | 47 | mapped = __nscd_get_map_ref (GETFDGR, "group", &__gr_map_handle, &gc_cycle); |
0891f970 UD |
48 | |
49 | retry:; | |
f7e7a396 UD |
50 | char *respdata = NULL; |
51 | int retval = -1; | |
52 | int sock = -1; | |
32c075e1 | 53 | initgr_response_header initgr_resp; |
f7e7a396 | 54 | |
f7e7a396 UD |
55 | if (mapped != NO_MAPPING) |
56 | { | |
32c075e1 JJ |
57 | struct datahead *found = __nscd_cache_search (INITGROUPS, user, |
58 | userlen, mapped); | |
f7e7a396 UD |
59 | if (found != NULL) |
60 | { | |
32c075e1 JJ |
61 | respdata = (char *) (&found->data[0].initgrdata + 1); |
62 | initgr_resp = found->data[0].initgrdata; | |
f7e7a396 UD |
63 | char *recend = (char *) found->data + found->recsize; |
64 | ||
32c075e1 JJ |
65 | /* Now check if we can trust initgr_resp fields. If GC is |
66 | in progress, it can contain anything. */ | |
67 | if (mapped->head->gc_cycle != gc_cycle) | |
68 | { | |
69 | retval = -2; | |
70 | goto out; | |
71 | } | |
72 | ||
73 | if (respdata + initgr_resp.ngrps * sizeof (int32_t) > recend) | |
f7e7a396 UD |
74 | goto out; |
75 | } | |
76 | } | |
77 | ||
78 | /* If we do not have the cache mapped, try to get the data over the | |
79 | socket. */ | |
32c075e1 | 80 | if (respdata == NULL) |
f7e7a396 | 81 | { |
32c075e1 JJ |
82 | sock = __nscd_open_socket (user, userlen, INITGROUPS, &initgr_resp, |
83 | sizeof (initgr_resp)); | |
f7e7a396 | 84 | if (sock == -1) |
48ad81fa | 85 | { |
6aa10807 | 86 | /* nscd not running or wrong version. */ |
48ad81fa UD |
87 | __nss_not_use_nscd_group = 1; |
88 | goto out; | |
89 | } | |
f7e7a396 UD |
90 | } |
91 | ||
32c075e1 | 92 | if (initgr_resp.found == 1) |
f7e7a396 UD |
93 | { |
94 | /* The following code assumes that gid_t and int32_t are the | |
95 | same size. This is the case for al existing implementation. | |
96 | If this should change some code needs to be added which | |
97 | doesn't use memcpy but instead copies each array element one | |
98 | by one. */ | |
99 | assert (sizeof (int32_t) == sizeof (gid_t)); | |
32c075e1 | 100 | assert (initgr_resp.ngrps >= 0); |
f7e7a396 UD |
101 | |
102 | /* Make sure we have enough room. We always count GROUP in even | |
103 | though we might not end up adding it. */ | |
32c075e1 | 104 | if (*size < initgr_resp.ngrps + 1) |
f7e7a396 UD |
105 | { |
106 | gid_t *newp = realloc (*groupsp, | |
32c075e1 | 107 | (initgr_resp.ngrps + 1) * sizeof (gid_t)); |
f7e7a396 UD |
108 | if (newp == NULL) |
109 | /* We cannot increase the buffer size. */ | |
6aa10807 | 110 | goto out_close; |
f7e7a396 UD |
111 | |
112 | *groupsp = newp; | |
32c075e1 | 113 | *size = initgr_resp.ngrps + 1; |
f7e7a396 UD |
114 | } |
115 | ||
116 | if (respdata == NULL) | |
117 | { | |
118 | /* Read the data from the socket. */ | |
32c075e1 | 119 | if ((size_t) __readall (sock, *groupsp, initgr_resp.ngrps |
d2dc7d84 | 120 | * sizeof (gid_t)) |
32c075e1 JJ |
121 | == initgr_resp.ngrps * sizeof (gid_t)) |
122 | retval = initgr_resp.ngrps; | |
f7e7a396 UD |
123 | } |
124 | else | |
125 | { | |
126 | /* Just copy the data. */ | |
32c075e1 | 127 | retval = initgr_resp.ngrps; |
f7e7a396 UD |
128 | memcpy (*groupsp, respdata, retval * sizeof (gid_t)); |
129 | } | |
f7e7a396 UD |
130 | } |
131 | else | |
f7fa2b19 | 132 | { |
32c075e1 | 133 | if (__builtin_expect (initgr_resp.found == -1, 0)) |
6aa10807 UD |
134 | { |
135 | /* The daemon does not cache this database. */ | |
136 | __nss_not_use_nscd_group = 1; | |
137 | goto out_close; | |
138 | } | |
139 | ||
f7fa2b19 UD |
140 | /* No group found yet. */ |
141 | retval = 0; | |
142 | ||
143 | assert (*size >= 1); | |
144 | } | |
927f0673 UD |
145 | |
146 | /* Check whether GROUP is part of the mix. If not, add it. */ | |
147 | if (retval >= 0) | |
f7e7a396 | 148 | { |
927f0673 UD |
149 | int cnt; |
150 | for (cnt = 0; cnt < retval; ++cnt) | |
151 | if ((*groupsp)[cnt] == group) | |
152 | break; | |
153 | ||
154 | if (cnt == retval) | |
155 | (*groupsp)[retval++] = group; | |
f7e7a396 UD |
156 | } |
157 | ||
6aa10807 | 158 | out_close: |
f7e7a396 UD |
159 | if (sock != -1) |
160 | close_not_cancel_no_status (sock); | |
161 | out: | |
32c075e1 | 162 | if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0) |
0891f970 UD |
163 | { |
164 | /* When we come here this means there has been a GC cycle while we | |
165 | were looking for the data. This means the data might have been | |
166 | inconsistent. Retry if possible. */ | |
32c075e1 | 167 | if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1) |
0891f970 UD |
168 | { |
169 | /* nscd is just running gc now. Disable using the mapping. */ | |
32c075e1 JJ |
170 | if (atomic_decrement_val (&mapped->counter) == 0) |
171 | __nscd_unmap (mapped); | |
0891f970 UD |
172 | mapped = NO_MAPPING; |
173 | } | |
174 | ||
32c075e1 JJ |
175 | if (retval != -1) |
176 | goto retry; | |
0891f970 | 177 | } |
f7e7a396 UD |
178 | |
179 | return retval; | |
180 | } |