450 lines
14 KiB
C
450 lines
14 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2008-2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <limits.h>
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#include <nss.h>
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#include <sys/types.h>
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#include <netdb.h>
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#include <errno.h>
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#include <string.h>
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#include <assert.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include "ifconf.h"
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#include "macro.h"
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#include "util.h"
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/* We use 127.0.0.2 as IPv4 address. This has the advantage over
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* 127.0.0.1 that it can be translated back to the local hostname. For
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* IPv6 we use ::1 which unfortunately will not translate back to the
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* hostname but instead something like "localhost6" or so. */
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#define LOCALADDRESS_IPV4 (htonl(0x7F000002))
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#define LOCALADDRESS_IPV6 &in6addr_loopback
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#define LOOPBACK_INTERFACE "lo"
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enum nss_status _nss_myhostname_gethostbyname4_r(
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const char *name,
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struct gaih_addrtuple **pat,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp) _public_;
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enum nss_status _nss_myhostname_gethostbyname3_r(
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const char *name,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp,
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char **canonp) _public_;
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enum nss_status _nss_myhostname_gethostbyname2_r(
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const char *name,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop) _public_;
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enum nss_status _nss_myhostname_gethostbyname_r(
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const char *name,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop) _public_;
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enum nss_status _nss_myhostname_gethostbyaddr2_r(
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const void* addr, socklen_t len,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp) _public_;
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enum nss_status _nss_myhostname_gethostbyaddr_r(
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const void* addr, socklen_t len,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop) _public_;
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enum nss_status _nss_myhostname_gethostbyname4_r(
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const char *name,
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struct gaih_addrtuple **pat,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp) {
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unsigned lo_ifi;
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char hn[HOST_NAME_MAX+1] = {};
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size_t l, idx, ms;
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char *r_name;
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struct gaih_addrtuple *r_tuple, *r_tuple_prev = NULL;
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struct address *addresses = NULL, *a;
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unsigned n_addresses = 0, n;
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if (gethostname(hn, sizeof(hn)-1) < 0) {
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*errnop = errno;
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*h_errnop = NO_RECOVERY;
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return NSS_STATUS_UNAVAIL;
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}
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if (strcasecmp(name, hn) != 0) {
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*errnop = ENOENT;
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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}
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/* If this fails, n_addresses is 0. Which is fine */
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ifconf_acquire_addresses(&addresses, &n_addresses);
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/* If this call fails we fill in 0 as scope. Which is fine */
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lo_ifi = if_nametoindex(LOOPBACK_INTERFACE);
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l = strlen(hn);
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ms = ALIGN(l+1)+ALIGN(sizeof(struct gaih_addrtuple))*(n_addresses > 0 ? n_addresses : 2);
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if (buflen < ms) {
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*errnop = ENOMEM;
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*h_errnop = NO_RECOVERY;
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free(addresses);
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return NSS_STATUS_TRYAGAIN;
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}
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/* First, fill in hostname */
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r_name = buffer;
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memcpy(r_name, hn, l+1);
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idx = ALIGN(l+1);
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if (n_addresses <= 0) {
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/* Second, fill in IPv6 tuple */
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r_tuple = (struct gaih_addrtuple*) (buffer + idx);
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r_tuple->next = r_tuple_prev;
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r_tuple->name = r_name;
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r_tuple->family = AF_INET6;
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memcpy(r_tuple->addr, LOCALADDRESS_IPV6, 16);
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r_tuple->scopeid = (uint32_t) lo_ifi;
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idx += ALIGN(sizeof(struct gaih_addrtuple));
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r_tuple_prev = r_tuple;
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/* Third, fill in IPv4 tuple */
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r_tuple = (struct gaih_addrtuple*) (buffer + idx);
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r_tuple->next = r_tuple_prev;
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r_tuple->name = r_name;
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r_tuple->family = AF_INET;
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*(uint32_t*) r_tuple->addr = LOCALADDRESS_IPV4;
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r_tuple->scopeid = (uint32_t) lo_ifi;
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idx += ALIGN(sizeof(struct gaih_addrtuple));
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r_tuple_prev = r_tuple;
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}
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/* Fourth, fill actual addresses in, but in backwards order */
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for (a = addresses + n_addresses - 1, n = 0; n < n_addresses; n++, a--) {
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r_tuple = (struct gaih_addrtuple*) (buffer + idx);
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r_tuple->next = r_tuple_prev;
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r_tuple->name = r_name;
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r_tuple->family = a->family;
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r_tuple->scopeid = a->ifindex;
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memcpy(r_tuple->addr, a->address, 16);
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idx += ALIGN(sizeof(struct gaih_addrtuple));
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r_tuple_prev = r_tuple;
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}
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/* Verify the size matches */
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assert(idx == ms);
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/* Nscd expects us to store the first record in **pat. */
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if (*pat)
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**pat = *r_tuple_prev;
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else
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*pat = r_tuple_prev;
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if (ttlp)
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*ttlp = 0;
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free(addresses);
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status fill_in_hostent(
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const char *hn,
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int af,
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struct hostent *result,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp,
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char **canonp) {
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size_t l, idx, ms;
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char *r_addr, *r_name, *r_aliases, *r_addr_list;
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size_t alen;
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struct address *addresses = NULL, *a;
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unsigned n_addresses = 0, n, c;
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alen = PROTO_ADDRESS_SIZE(af);
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ifconf_acquire_addresses(&addresses, &n_addresses);
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for (a = addresses, n = 0, c = 0; n < n_addresses; a++, n++)
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if (af == a->family)
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c++;
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l = strlen(hn);
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ms = ALIGN(l+1)+
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sizeof(char*)+
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(c > 0 ? c : 1)*ALIGN(alen)+
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(c > 0 ? c+1 : 2)*sizeof(char*);
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if (buflen < ms) {
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*errnop = ENOMEM;
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*h_errnop = NO_RECOVERY;
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free(addresses);
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return NSS_STATUS_TRYAGAIN;
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}
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/* First, fill in hostname */
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r_name = buffer;
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memcpy(r_name, hn, l+1);
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idx = ALIGN(l+1);
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/* Second, create (empty) aliases array */
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r_aliases = buffer + idx;
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*(char**) r_aliases = NULL;
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idx += sizeof(char*);
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/* Third, add addresses */
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r_addr = buffer + idx;
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if (c > 0) {
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unsigned i = 0;
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for (a = addresses, n = 0; n < n_addresses; a++, n++) {
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if (af != a->family)
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continue;
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memcpy(r_addr + i*ALIGN(alen), a->address, alen);
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i++;
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}
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assert(i == c);
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idx += c*ALIGN(alen);
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} else {
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if (af == AF_INET)
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*(uint32_t*) r_addr = LOCALADDRESS_IPV4;
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else
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memcpy(r_addr, LOCALADDRESS_IPV6, 16);
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idx += ALIGN(alen);
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}
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/* Fourth, add address pointer array */
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r_addr_list = buffer + idx;
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if (c > 0) {
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unsigned i = 0;
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for (a = addresses, n = 0; n < n_addresses; a++, n++) {
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if (af != a->family)
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continue;
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((char**) r_addr_list)[i] = (r_addr + i*ALIGN(alen));
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i++;
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}
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assert(i == c);
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((char**) r_addr_list)[c] = NULL;
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idx += (c+1)*sizeof(char*);
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} else {
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((char**) r_addr_list)[0] = r_addr;
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((char**) r_addr_list)[1] = NULL;
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idx += 2*sizeof(char*);
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}
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/* Verify the size matches */
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assert(idx == ms);
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result->h_name = r_name;
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result->h_aliases = (char**) r_aliases;
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result->h_addrtype = af;
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result->h_length = alen;
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result->h_addr_list = (char**) r_addr_list;
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if (ttlp)
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*ttlp = 0;
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if (canonp)
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*canonp = r_name;
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free(addresses);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status _nss_myhostname_gethostbyname3_r(
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const char *name,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp,
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char **canonp) {
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char hn[HOST_NAME_MAX+1] = {};
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if (af == AF_UNSPEC)
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af = AF_INET;
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if (af != AF_INET && af != AF_INET6) {
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*errnop = EAFNOSUPPORT;
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*h_errnop = NO_DATA;
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return NSS_STATUS_UNAVAIL;
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}
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if (gethostname(hn, sizeof(hn)-1) < 0) {
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*errnop = errno;
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*h_errnop = NO_RECOVERY;
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return NSS_STATUS_UNAVAIL;
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}
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if (strcasecmp(name, hn) != 0) {
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*errnop = ENOENT;
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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}
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return fill_in_hostent(hn, af, host, buffer, buflen, errnop, h_errnop, ttlp, canonp);
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}
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enum nss_status _nss_myhostname_gethostbyname2_r(
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const char *name,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop) {
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return _nss_myhostname_gethostbyname3_r(
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name,
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af,
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host,
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buffer, buflen,
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errnop, h_errnop,
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NULL,
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NULL);
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}
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enum nss_status _nss_myhostname_gethostbyname_r(
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const char *name,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop) {
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return _nss_myhostname_gethostbyname3_r(
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name,
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AF_UNSPEC,
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host,
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buffer, buflen,
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errnop, h_errnop,
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NULL,
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NULL);
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}
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enum nss_status _nss_myhostname_gethostbyaddr2_r(
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const void* addr, socklen_t len,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp) {
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char hn[HOST_NAME_MAX+1] = {};
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_cleanup_free_ struct address *addresses = NULL;
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struct address *a;
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unsigned n_addresses = 0, n;
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if (len != PROTO_ADDRESS_SIZE(af)) {
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*errnop = EINVAL;
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*h_errnop = NO_RECOVERY;
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return NSS_STATUS_UNAVAIL;
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}
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if (af == AF_INET) {
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if ((*(uint32_t*) addr) == LOCALADDRESS_IPV4)
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goto found;
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} else if (af == AF_INET6) {
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if (memcmp(addr, LOCALADDRESS_IPV6, 16) == 0)
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goto found;
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} else {
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*errnop = EAFNOSUPPORT;
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*h_errnop = NO_DATA;
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return NSS_STATUS_UNAVAIL;
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}
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ifconf_acquire_addresses(&addresses, &n_addresses);
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for (a = addresses, n = 0; n < n_addresses; n++, a++) {
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if (af != a->family)
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continue;
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if (memcmp(addr, a->address, PROTO_ADDRESS_SIZE(af)) == 0)
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goto found;
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}
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*errnop = ENOENT;
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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found:
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if (gethostname(hn, sizeof(hn)-1) < 0) {
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*errnop = errno;
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*h_errnop = NO_RECOVERY;
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return NSS_STATUS_UNAVAIL;
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}
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return fill_in_hostent(hn, af, host, buffer, buflen, errnop, h_errnop, ttlp, NULL);
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}
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enum nss_status _nss_myhostname_gethostbyaddr_r(
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const void* addr, socklen_t len,
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int af,
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struct hostent *host,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop) {
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return _nss_myhostname_gethostbyaddr2_r(
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addr, len,
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af,
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host,
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buffer, buflen,
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errnop, h_errnop,
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NULL);
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}
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