source: trunk/debathena/debathena/libnss-nonlocal/walk_nss.h @ 25083

Revision 25083, 2.2 KB checked in by andersk, 13 years ago (diff)
In nss_nonlocal: * New upstream release. - Fix errno saving and restoring. - Document nss-nonlocal-users and nss-local-users groups in README. - Allow local whitelisting of nonlocal user and group memberships, using the magic local ‘nss-nonlocal-users’ user and group. * Create magic ‘nss-nonlocal-users’ user. * Remove obsolete exclusion of glibc-private dependency. * Use automake 1.10 and autoconf 2.61. * Add multiarch support for distros from the future. * Disable dh_buildinfo, which currently fails at multiarch. Full history: git://andersk.mit.edu/nss_nonlocal.git debian/2.0-0debathena1
RevLine 
[25083]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{
27    static service_user *startp = NULL;
28    static void *fct_start = NULL;
29
30    service_user *nip;
31    union {
32        __typeof__(self) l;
33        void *ptr;
34    } fct;
35    int old_errno = errno;
36
37    if (fct_start == NULL &&
38        w.lookup(&startp, w.fct_name, &fct_start) != 0) {
39        *w.status = NSS_STATUS_UNAVAIL;
40        goto walk_nss_out;
41    }
42
43    nip = startp;
44    fct.ptr = fct_start;
45
46    if (w.buf != NULL) {
47        *w.buf = malloc(*w.buflen);
48        errno = old_errno;
49        if (*w.buf == NULL) {
50            *w.status = NSS_STATUS_TRYAGAIN;
51            *w.errnop = ENOMEM;
52            goto walk_nss_out;
53        }
54    }
55
56    do {
57    walk_nss_morebuf:
58        if (fct.ptr == NULL)
59            *w.status = NSS_STATUS_UNAVAIL;
60        else if (self != NULL && fct.l == self)
61            *w.status = NSS_STATUS_NOTFOUND;
62        else
63            *w.status = DL_CALL_FCT(fct.l, args);
64        if (*w.status == NSS_STATUS_TRYAGAIN &&
65            w.errnop != NULL && *w.errnop == ERANGE) {
66            if (w.buf == NULL)
67                break;
68            free(*w.buf);
69            *w.buflen *= 2;
70            *w.buf = malloc(*w.buflen);
71            errno = old_errno;
72            if (*w.buf == NULL) {
73                *w.errnop = ENOMEM;
74                goto walk_nss_out;
75            }
76            goto walk_nss_morebuf;
77        }
78    } while (__nss_next(&nip, w.fct_name, &fct.ptr, *w.status, 0) == 0);
79
80    if (w.buf != NULL && *w.status != NSS_STATUS_SUCCESS) {
81        free(*w.buf);
82        *w.buf = NULL;
83    }
84
85 walk_nss_out:
86    ;
87}
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