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cbb0e3ea AK |
1 | /* |
2 | * walk_nss.h | |
3 | * NSS walking template for nss_nonlocal proxy | |
4 | * | |
5 | * Copyright © 2011 Anders Kaseorg <andersk@mit.edu> and Tim Abbott | |
6 | * <tabbott@mit.edu> | |
7 | * | |
8 | * This file is part of nss_nonlocal. | |
9 | * | |
10 | * nss_nonlocal is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU Lesser General Public License | |
12 | * as published by the Free Software Foundation; either version 2.1 of | |
13 | * the License, or (at your option) any later version. | |
14 | * | |
15 | * nss_nonlocal is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public | |
21 | * License along with nss_nonlocal; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
23 | * 02110-1301 USA | |
24 | */ | |
25 | ||
26 | { | |
48939704 AK |
27 | static bool initialized = false; |
28 | static service_user *startp; | |
29 | static void *fct_start; | |
cbb0e3ea AK |
30 | |
31 | service_user *nip; | |
32 | union { | |
33 | __typeof__(self) l; | |
34 | void *ptr; | |
35 | } fct; | |
36 | int old_errno = errno; | |
37 | ||
48939704 | 38 | if (!initialized) { |
d52c3f35 | 39 | if (w.lookup2(&startp, w.fct_name, NULL, &fct_start) != 0) { |
48939704 AK |
40 | *w.status = NSS_STATUS_UNAVAIL; |
41 | goto walk_nss_out; | |
42 | } | |
43 | __sync_synchronize(); | |
44 | initialized = true; | |
cbb0e3ea AK |
45 | } |
46 | ||
47 | nip = startp; | |
48 | fct.ptr = fct_start; | |
49 | ||
50 | if (w.buf != NULL) { | |
51 | *w.buf = malloc(*w.buflen); | |
52 | errno = old_errno; | |
53 | if (*w.buf == NULL) { | |
54 | *w.status = NSS_STATUS_TRYAGAIN; | |
55 | *w.errnop = ENOMEM; | |
56 | goto walk_nss_out; | |
57 | } | |
58 | } | |
59 | ||
60 | do { | |
61 | walk_nss_morebuf: | |
62 | if (fct.ptr == NULL) | |
63 | *w.status = NSS_STATUS_UNAVAIL; | |
64 | else if (self != NULL && fct.l == self) | |
65 | *w.status = NSS_STATUS_NOTFOUND; | |
66 | else | |
67 | *w.status = DL_CALL_FCT(fct.l, args); | |
68 | if (*w.status == NSS_STATUS_TRYAGAIN && | |
69 | w.errnop != NULL && *w.errnop == ERANGE) { | |
70 | if (w.buf == NULL) | |
71 | break; | |
72 | free(*w.buf); | |
73 | *w.buflen *= 2; | |
74 | *w.buf = malloc(*w.buflen); | |
75 | errno = old_errno; | |
76 | if (*w.buf == NULL) { | |
77 | *w.errnop = ENOMEM; | |
78 | goto walk_nss_out; | |
79 | } | |
80 | goto walk_nss_morebuf; | |
81 | } | |
d52c3f35 AK |
82 | } while (__nss_next2(&nip, w.fct_name, NULL, &fct.ptr, *w.status, |
83 | w.all_values) == 0); | |
cbb0e3ea AK |
84 | |
85 | if (w.buf != NULL && *w.status != NSS_STATUS_SUCCESS) { | |
86 | free(*w.buf); | |
87 | *w.buf = NULL; | |
88 | } | |
89 | ||
90 | walk_nss_out: | |
91 | ; | |
92 | } |