andersk / nss_nonlocal.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | { | |
| 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 | } |