c9226c03da
Fix the subscript on air->family, which was accidentally set to COUNT when it should have remained as I. Resolves: BZ #29605 Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2624 lines
66 KiB
C
2624 lines
66 KiB
C
/* Host and service name lookups using Name Service Switch modules.
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Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* The Inner Net License, Version 2.00
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The author(s) grant permission for redistribution and use in source and
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binary forms, with or without modification, of the software and documentation
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provided that the following conditions are met:
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0. If you receive a version of the software that is specifically labelled
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as not being for redistribution (check the version message and/or README),
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you are not permitted to redistribute that version of the software in any
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way or form.
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1. All terms of the all other applicable copyrights and licenses must be
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followed.
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2. Redistributions of source code must retain the authors' copyright
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notice(s), this list of conditions, and the following disclaimer.
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3. Redistributions in binary form must reproduce the authors' copyright
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notice(s), this list of conditions, and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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4. [The copyright holder has authorized the removal of this clause.]
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5. Neither the name(s) of the author(s) nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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If these license terms cause you a real problem, contact the author. */
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/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <ifaddrs.h>
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#include <netdb.h>
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#include <nss.h>
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#include <resolv/resolv-internal.h>
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#include <resolv/resolv_context.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#include <nsswitch.h>
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#include <libc-lock.h>
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#include <not-cancel.h>
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#include <nscd/nscd-client.h>
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#include <nscd/nscd_proto.h>
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#include <scratch_buffer.h>
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#include <inet/net-internal.h>
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/* Former AI_IDN_ALLOW_UNASSIGNED and AI_IDN_USE_STD3_ASCII_RULES
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flags, now ignored. */
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#define DEPRECATED_AI_IDN 0x300
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#if IS_IN (libc)
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# define feof_unlocked(fp) __feof_unlocked (fp)
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#endif
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struct gaih_service
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{
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const char *name;
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int num;
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};
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struct gaih_servtuple
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{
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int socktype;
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int protocol;
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int port;
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bool set;
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};
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struct gaih_typeproto
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{
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int socktype;
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int protocol;
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uint8_t protoflag;
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bool defaultflag;
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char name[8];
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};
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struct gaih_result
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{
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struct gaih_addrtuple *at;
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char *canon;
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bool free_at;
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bool got_ipv6;
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};
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/* Values for `protoflag'. */
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#define GAI_PROTO_NOSERVICE 1
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#define GAI_PROTO_PROTOANY 2
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static const struct gaih_typeproto gaih_inet_typeproto[] =
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{
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{ 0, 0, 0, false, "" },
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{ SOCK_STREAM, IPPROTO_TCP, 0, true, "tcp" },
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{ SOCK_DGRAM, IPPROTO_UDP, 0, true, "udp" },
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#if defined SOCK_DCCP && defined IPPROTO_DCCP
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{ SOCK_DCCP, IPPROTO_DCCP, 0, false, "dccp" },
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#endif
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#ifdef IPPROTO_UDPLITE
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{ SOCK_DGRAM, IPPROTO_UDPLITE, 0, false, "udplite" },
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#endif
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#ifdef IPPROTO_SCTP
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{ SOCK_STREAM, IPPROTO_SCTP, 0, false, "sctp" },
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{ SOCK_SEQPACKET, IPPROTO_SCTP, 0, false, "sctp" },
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#endif
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{ SOCK_RAW, 0, GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE, true, "raw" },
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{ 0, 0, 0, false, "" }
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};
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static const struct addrinfo default_hints =
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{
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.ai_flags = AI_DEFAULT,
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.ai_family = PF_UNSPEC,
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.ai_socktype = 0,
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.ai_protocol = 0,
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.ai_addrlen = 0,
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.ai_addr = NULL,
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.ai_canonname = NULL,
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.ai_next = NULL
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};
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static void
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gaih_result_reset (struct gaih_result *res)
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{
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if (res->free_at)
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free (res->at);
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free (res->canon);
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memset (res, 0, sizeof (*res));
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}
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static int
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gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
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const struct addrinfo *req, struct gaih_servtuple *st,
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struct scratch_buffer *tmpbuf)
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{
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struct servent *s;
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struct servent ts;
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int r;
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do
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{
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r = __getservbyname_r (servicename, tp->name, &ts,
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tmpbuf->data, tmpbuf->length, &s);
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if (r != 0 || s == NULL)
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{
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if (r == ERANGE)
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{
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if (!scratch_buffer_grow (tmpbuf))
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return -EAI_MEMORY;
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}
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else
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return -EAI_SERVICE;
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}
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}
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while (r);
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st->socktype = tp->socktype;
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st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
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? req->ai_protocol : tp->protocol);
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st->port = s->s_port;
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st->set = true;
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return 0;
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}
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/* Convert struct hostent to a list of struct gaih_addrtuple objects. h_name
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is not copied, and the struct hostent object must not be deallocated
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prematurely. The new addresses are appended to the tuple array in RES. */
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static bool
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convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, int family,
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struct hostent *h, struct gaih_result *res)
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{
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/* Count the number of addresses in h->h_addr_list. */
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size_t count = 0;
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for (char **p = h->h_addr_list; *p != NULL; ++p)
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++count;
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/* Report no data if no addresses are available, or if the incoming
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address size is larger than what we can store. */
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if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr))
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return true;
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struct gaih_addrtuple *array = res->at;
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size_t old = 0;
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while (array != NULL)
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{
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old++;
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array = array->next;
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}
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array = realloc (res->at, (old + count) * sizeof (*array));
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if (array == NULL)
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return false;
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res->got_ipv6 = family == AF_INET6;
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res->at = array;
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res->free_at = true;
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/* Update the next pointers on reallocation. */
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for (size_t i = 0; i < old; i++)
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array[i].next = array + i + 1;
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array += old;
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memset (array, 0, count * sizeof (*array));
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for (size_t i = 0; i < count; ++i)
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{
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if (family == AF_INET && req->ai_family == AF_INET6)
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{
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/* Perform address mapping. */
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array[i].family = AF_INET6;
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memcpy(array[i].addr + 3, h->h_addr_list[i], sizeof (uint32_t));
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array[i].addr[2] = htonl (0xffff);
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}
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else
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{
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array[i].family = family;
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memcpy (array[i].addr, h->h_addr_list[i], h->h_length);
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}
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array[i].next = array + i + 1;
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}
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array[0].name = h->h_name;
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array[count - 1].next = NULL;
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return true;
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}
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static int
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gethosts (nss_gethostbyname3_r fct, int family, const char *name,
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const struct addrinfo *req, struct scratch_buffer *tmpbuf,
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struct gaih_result *res, enum nss_status *statusp, int *no_datap)
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{
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struct hostent th;
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char *localcanon = NULL;
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enum nss_status status;
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*no_datap = 0;
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while (1)
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{
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*statusp = status = DL_CALL_FCT (fct, (name, family, &th,
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tmpbuf->data, tmpbuf->length,
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&errno, &h_errno, NULL,
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&localcanon));
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if (status != NSS_STATUS_TRYAGAIN || h_errno != NETDB_INTERNAL
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|| errno != ERANGE)
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break;
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if (!scratch_buffer_grow (tmpbuf))
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return -EAI_MEMORY;
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}
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if (status == NSS_STATUS_NOTFOUND
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|| status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL)
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{
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if (h_errno == NETDB_INTERNAL)
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return -EAI_SYSTEM;
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if (h_errno == TRY_AGAIN)
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*no_datap = EAI_AGAIN;
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else
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*no_datap = h_errno == NO_DATA;
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}
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else if (status == NSS_STATUS_SUCCESS)
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{
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if (!convert_hostent_to_gaih_addrtuple (req, family, &th, res))
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return -EAI_MEMORY;
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if (localcanon != NULL && res->canon == NULL)
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{
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char *canonbuf = __strdup (localcanon);
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if (canonbuf == NULL)
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return -EAI_MEMORY;
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res->canon = canonbuf;
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}
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}
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return 0;
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}
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/* This function is called if a canonical name is requested, but if
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the service function did not provide it. It tries to obtain the
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name using getcanonname_r from the same service NIP. If the name
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cannot be canonicalized, return a copy of NAME. Return NULL on
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memory allocation failure. The returned string is allocated on the
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heap; the caller has to free it. */
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static char *
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getcanonname (nss_action_list nip, struct gaih_addrtuple *at, const char *name)
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{
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nss_getcanonname_r *cfct = __nss_lookup_function (nip, "getcanonname_r");
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char *s = (char *) name;
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if (cfct != NULL)
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{
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char buf[256];
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if (DL_CALL_FCT (cfct, (at->name ?: name, buf, sizeof (buf),
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&s, &errno, &h_errno)) != NSS_STATUS_SUCCESS)
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/* If the canonical name cannot be determined, use the passed
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string. */
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s = (char *) name;
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}
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return __strdup (name);
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}
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/* Process looked up canonical name and if necessary, decode to IDNA. Result
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is a new string written to CANONP and the earlier string is freed. */
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static int
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process_canonname (const struct addrinfo *req, const char *orig_name,
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struct gaih_result *res)
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{
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char *canon = res->canon;
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if ((req->ai_flags & AI_CANONNAME) != 0)
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{
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bool do_idn = req->ai_flags & AI_CANONIDN;
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if (do_idn)
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{
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char *out;
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int rc = __idna_from_dns_encoding (canon ?: orig_name, &out);
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if (rc == 0)
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{
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free (canon);
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canon = out;
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}
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else if (rc == EAI_IDN_ENCODE)
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/* Use the punycode name as a fallback. */
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do_idn = false;
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else
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return -rc;
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}
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if (!do_idn && canon == NULL && (canon = __strdup (orig_name)) == NULL)
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return -EAI_MEMORY;
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}
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res->canon = canon;
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return 0;
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}
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static int
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get_servtuples (const struct gaih_service *service, const struct addrinfo *req,
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struct gaih_servtuple *st, struct scratch_buffer *tmpbuf)
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{
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int i;
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const struct gaih_typeproto *tp = gaih_inet_typeproto;
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if (req->ai_protocol || req->ai_socktype)
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{
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++tp;
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while (tp->name[0]
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&& ((req->ai_socktype != 0 && req->ai_socktype != tp->socktype)
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|| (req->ai_protocol != 0
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&& !(tp->protoflag & GAI_PROTO_PROTOANY)
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&& req->ai_protocol != tp->protocol)))
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++tp;
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if (! tp->name[0])
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{
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if (req->ai_socktype)
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return -EAI_SOCKTYPE;
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else
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return -EAI_SERVICE;
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}
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}
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if (service != NULL && (tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
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return -EAI_SERVICE;
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if (service == NULL || service->num >= 0)
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{
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int port = service != NULL ? htons (service->num) : 0;
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if (req->ai_socktype || req->ai_protocol)
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{
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st[0].socktype = tp->socktype;
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st[0].protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
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? req->ai_protocol : tp->protocol);
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st[0].port = port;
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st[0].set = true;
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return 0;
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}
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/* Neither socket type nor protocol is set. Return all socket types
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we know about. */
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for (i = 0, ++tp; tp->name[0]; ++tp)
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if (tp->defaultflag)
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{
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st[i].socktype = tp->socktype;
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st[i].protocol = tp->protocol;
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st[i].port = port;
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st[i++].set = true;
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}
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return 0;
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}
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if (tp->name[0])
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return gaih_inet_serv (service->name, tp, req, st, tmpbuf);
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for (i = 0, tp++; tp->name[0]; tp++)
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{
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if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
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continue;
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if (req->ai_socktype != 0
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&& req->ai_socktype != tp->socktype)
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continue;
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if (req->ai_protocol != 0
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&& !(tp->protoflag & GAI_PROTO_PROTOANY)
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&& req->ai_protocol != tp->protocol)
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continue;
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if (gaih_inet_serv (service->name,
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tp, req, &st[i], tmpbuf) != 0)
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continue;
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i++;
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}
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if (!st[0].set)
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return -EAI_SERVICE;
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|
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return 0;
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}
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|
|
#ifdef USE_NSCD
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|
/* Query addresses from nscd cache, returning a non-zero value on error.
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|
RES members have the lookup result; RES->AT is NULL if there were no errors
|
|
but also no results. */
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|
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static int
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get_nscd_addresses (const char *name, const struct addrinfo *req,
|
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struct gaih_result *res)
|
|
{
|
|
if (__nss_not_use_nscd_hosts > 0
|
|
&& ++__nss_not_use_nscd_hosts > NSS_NSCD_RETRY)
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__nss_not_use_nscd_hosts = 0;
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res->at = NULL;
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if (__nss_not_use_nscd_hosts || __nss_database_custom[NSS_DBSIDX_hosts])
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return 0;
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|
|
/* Try to use nscd. */
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|
struct nscd_ai_result *air = NULL;
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int err = __nscd_getai (name, &air, &h_errno);
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|
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if (__glibc_unlikely (air == NULL))
|
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{
|
|
/* The database contains a negative entry. */
|
|
if (err == 0)
|
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return -EAI_NONAME;
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if (__nss_not_use_nscd_hosts == 0)
|
|
{
|
|
if (h_errno == NETDB_INTERNAL && errno == ENOMEM)
|
|
return -EAI_MEMORY;
|
|
if (h_errno == TRY_AGAIN)
|
|
return -EAI_AGAIN;
|
|
return -EAI_SYSTEM;
|
|
}
|
|
return 0;
|
|
}
|
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|
|
/* Transform into gaih_addrtuple list. */
|
|
int result = 0;
|
|
char *addrs = air->addrs;
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|
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struct gaih_addrtuple *addrfree = calloc (air->naddrs, sizeof (*addrfree));
|
|
struct gaih_addrtuple *at = calloc (air->naddrs, sizeof (*at));
|
|
if (at == NULL)
|
|
{
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
|
|
res->free_at = true;
|
|
|
|
int count = 0;
|
|
for (int i = 0; i < air->naddrs; ++i)
|
|
{
|
|
socklen_t size = (air->family[i] == AF_INET
|
|
? INADDRSZ : IN6ADDRSZ);
|
|
|
|
if (!((air->family[i] == AF_INET
|
|
&& req->ai_family == AF_INET6
|
|
&& (req->ai_flags & AI_V4MAPPED) != 0)
|
|
|| req->ai_family == AF_UNSPEC
|
|
|| air->family[i] == req->ai_family))
|
|
{
|
|
/* Skip over non-matching result. */
|
|
addrs += size;
|
|
continue;
|
|
}
|
|
|
|
if (air->family[i] == AF_INET && req->ai_family == AF_INET6
|
|
&& (req->ai_flags & AI_V4MAPPED))
|
|
{
|
|
at[count].family = AF_INET6;
|
|
at[count].addr[3] = *(uint32_t *) addrs;
|
|
at[count].addr[2] = htonl (0xffff);
|
|
}
|
|
else if (req->ai_family == AF_UNSPEC
|
|
|| air->family[i] == req->ai_family)
|
|
{
|
|
at[count].family = air->family[i];
|
|
memcpy (at[count].addr, addrs, size);
|
|
if (air->family[i] == AF_INET6)
|
|
res->got_ipv6 = true;
|
|
}
|
|
at[count].next = at + count + 1;
|
|
count++;
|
|
addrs += size;
|
|
}
|
|
|
|
if ((req->ai_flags & AI_CANONNAME) && air->canon != NULL)
|
|
{
|
|
char *canonbuf = __strdup (air->canon);
|
|
if (canonbuf == NULL)
|
|
{
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
res->canon = canonbuf;
|
|
}
|
|
|
|
if (count == 0)
|
|
{
|
|
result = -EAI_NONAME;
|
|
goto out;
|
|
}
|
|
|
|
at[count - 1].next = NULL;
|
|
|
|
res->at = at;
|
|
|
|
out:
|
|
free (air);
|
|
if (result != 0)
|
|
{
|
|
free (at);
|
|
res->free_at = false;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
get_nss_addresses (const char *name, const struct addrinfo *req,
|
|
struct scratch_buffer *tmpbuf, struct gaih_result *res)
|
|
{
|
|
int no_data = 0;
|
|
int no_inet6_data = 0;
|
|
nss_action_list nip;
|
|
enum nss_status inet6_status = NSS_STATUS_UNAVAIL;
|
|
enum nss_status status = NSS_STATUS_UNAVAIL;
|
|
int no_more;
|
|
struct resolv_context *res_ctx = NULL;
|
|
bool do_merge = false;
|
|
int result = 0;
|
|
|
|
no_more = !__nss_database_get (nss_database_hosts, &nip);
|
|
|
|
/* If we are looking for both IPv4 and IPv6 address we don't
|
|
want the lookup functions to automatically promote IPv4
|
|
addresses to IPv6 addresses, so we use the no_inet6
|
|
function variant. */
|
|
res_ctx = __resolv_context_get ();
|
|
if (res_ctx == NULL)
|
|
no_more = 1;
|
|
|
|
while (!no_more)
|
|
{
|
|
/* Always start afresh; continue should discard previous results
|
|
and the hosts database does not support merge. */
|
|
gaih_result_reset (res);
|
|
|
|
if (do_merge)
|
|
{
|
|
__set_h_errno (NETDB_INTERNAL);
|
|
__set_errno (EBUSY);
|
|
break;
|
|
}
|
|
|
|
no_data = 0;
|
|
nss_gethostbyname4_r *fct4 = NULL;
|
|
|
|
/* gethostbyname4_r sends out parallel A and AAAA queries and
|
|
is thus only suitable for PF_UNSPEC. */
|
|
if (req->ai_family == PF_UNSPEC)
|
|
fct4 = __nss_lookup_function (nip, "gethostbyname4_r");
|
|
|
|
if (fct4 != NULL)
|
|
{
|
|
while (1)
|
|
{
|
|
status = DL_CALL_FCT (fct4, (name, &res->at,
|
|
tmpbuf->data, tmpbuf->length,
|
|
&errno, &h_errno,
|
|
NULL));
|
|
if (status == NSS_STATUS_SUCCESS)
|
|
break;
|
|
/* gethostbyname4_r may write into AT, so reset it. */
|
|
res->at = NULL;
|
|
if (status != NSS_STATUS_TRYAGAIN
|
|
|| errno != ERANGE || h_errno != NETDB_INTERNAL)
|
|
{
|
|
if (h_errno == TRY_AGAIN)
|
|
no_data = EAI_AGAIN;
|
|
else
|
|
no_data = h_errno == NO_DATA;
|
|
break;
|
|
}
|
|
|
|
if (!scratch_buffer_grow (tmpbuf))
|
|
{
|
|
__resolv_context_put (res_ctx);
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (status == NSS_STATUS_SUCCESS)
|
|
{
|
|
assert (!no_data);
|
|
no_data = 1;
|
|
|
|
if ((req->ai_flags & AI_CANONNAME) != 0 && res->canon == NULL)
|
|
{
|
|
char *canonbuf = __strdup (res->at->name);
|
|
if (canonbuf == NULL)
|
|
{
|
|
__resolv_context_put (res_ctx);
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
res->canon = canonbuf;
|
|
}
|
|
|
|
struct gaih_addrtuple **pat = &res->at;
|
|
|
|
while (*pat != NULL)
|
|
{
|
|
if ((*pat)->family == AF_INET
|
|
&& req->ai_family == AF_INET6
|
|
&& (req->ai_flags & AI_V4MAPPED) != 0)
|
|
{
|
|
uint32_t *pataddr = (*pat)->addr;
|
|
(*pat)->family = AF_INET6;
|
|
pataddr[3] = pataddr[0];
|
|
pataddr[2] = htonl (0xffff);
|
|
pataddr[1] = 0;
|
|
pataddr[0] = 0;
|
|
pat = &((*pat)->next);
|
|
no_data = 0;
|
|
}
|
|
else if (req->ai_family == AF_UNSPEC
|
|
|| (*pat)->family == req->ai_family)
|
|
{
|
|
pat = &((*pat)->next);
|
|
|
|
no_data = 0;
|
|
if (req->ai_family == AF_INET6)
|
|
res->got_ipv6 = true;
|
|
}
|
|
else
|
|
*pat = ((*pat)->next);
|
|
}
|
|
}
|
|
|
|
no_inet6_data = no_data;
|
|
}
|
|
else
|
|
{
|
|
nss_gethostbyname3_r *fct = NULL;
|
|
if (req->ai_flags & AI_CANONNAME)
|
|
/* No need to use this function if we do not look for
|
|
the canonical name. The function does not exist in
|
|
all NSS modules and therefore the lookup would
|
|
often fail. */
|
|
fct = __nss_lookup_function (nip, "gethostbyname3_r");
|
|
if (fct == NULL)
|
|
/* We are cheating here. The gethostbyname2_r
|
|
function does not have the same interface as
|
|
gethostbyname3_r but the extra arguments the
|
|
latter takes are added at the end. So the
|
|
gethostbyname2_r code will just ignore them. */
|
|
fct = __nss_lookup_function (nip, "gethostbyname2_r");
|
|
|
|
if (fct != NULL)
|
|
{
|
|
if (req->ai_family == AF_INET6
|
|
|| req->ai_family == AF_UNSPEC)
|
|
{
|
|
if ((result = gethosts (fct, AF_INET6, name, req, tmpbuf,
|
|
res, &status, &no_data)) != 0)
|
|
{
|
|
__resolv_context_put (res_ctx);
|
|
goto out;
|
|
}
|
|
no_inet6_data = no_data;
|
|
inet6_status = status;
|
|
}
|
|
if (req->ai_family == AF_INET
|
|
|| req->ai_family == AF_UNSPEC
|
|
|| (req->ai_family == AF_INET6
|
|
&& (req->ai_flags & AI_V4MAPPED)
|
|
/* Avoid generating the mapped addresses if we
|
|
know we are not going to need them. */
|
|
&& ((req->ai_flags & AI_ALL) || !res->got_ipv6)))
|
|
{
|
|
if ((result = gethosts (fct, AF_INET, name, req, tmpbuf,
|
|
res, &status, &no_data)) != 0)
|
|
{
|
|
__resolv_context_put (res_ctx);
|
|
goto out;
|
|
}
|
|
|
|
if (req->ai_family == AF_INET)
|
|
{
|
|
no_inet6_data = no_data;
|
|
inet6_status = status;
|
|
}
|
|
}
|
|
|
|
/* If we found one address for AF_INET or AF_INET6,
|
|
don't continue the search. */
|
|
if (inet6_status == NSS_STATUS_SUCCESS
|
|
|| status == NSS_STATUS_SUCCESS)
|
|
{
|
|
if ((req->ai_flags & AI_CANONNAME) != 0
|
|
&& res->canon == NULL)
|
|
{
|
|
char *canonbuf = getcanonname (nip, res->at, name);
|
|
if (canonbuf == NULL)
|
|
{
|
|
__resolv_context_put (res_ctx);
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
res->canon = canonbuf;
|
|
}
|
|
status = NSS_STATUS_SUCCESS;
|
|
}
|
|
else
|
|
{
|
|
/* We can have different states for AF_INET and
|
|
AF_INET6. Try to find a useful one for both. */
|
|
if (inet6_status == NSS_STATUS_TRYAGAIN)
|
|
status = NSS_STATUS_TRYAGAIN;
|
|
else if (status == NSS_STATUS_UNAVAIL
|
|
&& inet6_status != NSS_STATUS_UNAVAIL)
|
|
status = inet6_status;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Could not locate any of the lookup functions.
|
|
The NSS lookup code does not consistently set
|
|
errno, so we need to supply our own error
|
|
code here. The root cause could either be a
|
|
resource allocation failure, or a missing
|
|
service function in the DSO (so it should not
|
|
be listed in /etc/nsswitch.conf). Assume the
|
|
former, and return EBUSY. */
|
|
status = NSS_STATUS_UNAVAIL;
|
|
__set_h_errno (NETDB_INTERNAL);
|
|
__set_errno (EBUSY);
|
|
}
|
|
}
|
|
|
|
if (nss_next_action (nip, status) == NSS_ACTION_RETURN)
|
|
break;
|
|
|
|
/* The hosts database does not support MERGE. */
|
|
if (nss_next_action (nip, status) == NSS_ACTION_MERGE)
|
|
do_merge = true;
|
|
|
|
nip++;
|
|
if (nip->module == NULL)
|
|
no_more = -1;
|
|
}
|
|
|
|
__resolv_context_put (res_ctx);
|
|
|
|
/* If we have a failure which sets errno, report it using
|
|
EAI_SYSTEM. */
|
|
if ((status == NSS_STATUS_TRYAGAIN || status == NSS_STATUS_UNAVAIL)
|
|
&& h_errno == NETDB_INTERNAL)
|
|
{
|
|
result = -EAI_SYSTEM;
|
|
goto out;
|
|
}
|
|
|
|
if (no_data != 0 && no_inet6_data != 0)
|
|
{
|
|
/* If both requests timed out report this. */
|
|
if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN)
|
|
result = -EAI_AGAIN;
|
|
else
|
|
/* We made requests but they turned out no data. The name
|
|
is known, though. */
|
|
result = -EAI_NODATA;
|
|
}
|
|
|
|
out:
|
|
if (result != 0)
|
|
gaih_result_reset (res);
|
|
return result;
|
|
}
|
|
|
|
/* Convert numeric addresses to binary into RES. On failure, RES->AT is set to
|
|
NULL and an error code is returned. If AI_NUMERIC_HOST is not requested and
|
|
the function cannot determine a result, RES->AT is set to NULL and 0
|
|
returned. */
|
|
|
|
static int
|
|
text_to_binary_address (const char *name, const struct addrinfo *req,
|
|
struct gaih_result *res)
|
|
{
|
|
struct gaih_addrtuple *at = res->at;
|
|
int result = 0;
|
|
|
|
assert (at != NULL);
|
|
|
|
memset (at->addr, 0, sizeof (at->addr));
|
|
if (__inet_aton_exact (name, (struct in_addr *) at->addr) != 0)
|
|
{
|
|
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
|
|
at->family = AF_INET;
|
|
else if (req->ai_family == AF_INET6 && (req->ai_flags & AI_V4MAPPED))
|
|
{
|
|
at->addr[3] = at->addr[0];
|
|
at->addr[2] = htonl (0xffff);
|
|
at->addr[1] = 0;
|
|
at->addr[0] = 0;
|
|
at->family = AF_INET6;
|
|
}
|
|
else
|
|
{
|
|
result = -EAI_ADDRFAMILY;
|
|
goto out;
|
|
}
|
|
|
|
if (req->ai_flags & AI_CANONNAME)
|
|
{
|
|
char *canonbuf = __strdup (name);
|
|
if (canonbuf == NULL)
|
|
{
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
res->canon = canonbuf;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
char *scope_delim = strchr (name, SCOPE_DELIMITER);
|
|
int e;
|
|
|
|
if (scope_delim == NULL)
|
|
e = inet_pton (AF_INET6, name, at->addr);
|
|
else
|
|
e = __inet_pton_length (AF_INET6, name, scope_delim - name, at->addr);
|
|
|
|
if (e > 0)
|
|
{
|
|
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
|
|
at->family = AF_INET6;
|
|
else if (req->ai_family == AF_INET
|
|
&& IN6_IS_ADDR_V4MAPPED (at->addr))
|
|
{
|
|
at->addr[0] = at->addr[3];
|
|
at->family = AF_INET;
|
|
}
|
|
else
|
|
{
|
|
result = -EAI_ADDRFAMILY;
|
|
goto out;
|
|
}
|
|
|
|
if (scope_delim != NULL
|
|
&& __inet6_scopeid_pton ((struct in6_addr *) at->addr,
|
|
scope_delim + 1, &at->scopeid) != 0)
|
|
{
|
|
result = -EAI_NONAME;
|
|
goto out;
|
|
}
|
|
|
|
if (req->ai_flags & AI_CANONNAME)
|
|
{
|
|
char *canonbuf = __strdup (name);
|
|
if (canonbuf == NULL)
|
|
{
|
|
result = -EAI_MEMORY;
|
|
goto out;
|
|
}
|
|
res->canon = canonbuf;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if ((req->ai_flags & AI_NUMERICHOST))
|
|
result = -EAI_NONAME;
|
|
|
|
out:
|
|
res->at = NULL;
|
|
return result;
|
|
}
|
|
|
|
/* If possible, call the simple, old functions, which do not support IPv6 scope
|
|
ids, nor retrieving the canonical name. */
|
|
|
|
static int
|
|
try_simple_gethostbyname (const char *name, const struct addrinfo *req,
|
|
struct scratch_buffer *tmpbuf,
|
|
struct gaih_result *res)
|
|
{
|
|
res->at = NULL;
|
|
|
|
if (req->ai_family != AF_INET || (req->ai_flags & AI_CANONNAME) != 0)
|
|
return 0;
|
|
|
|
int rc;
|
|
struct hostent th;
|
|
struct hostent *h;
|
|
|
|
while (1)
|
|
{
|
|
rc = __gethostbyname2_r (name, AF_INET, &th, tmpbuf->data,
|
|
tmpbuf->length, &h, &h_errno);
|
|
if (rc != ERANGE || h_errno != NETDB_INTERNAL)
|
|
break;
|
|
if (!scratch_buffer_grow (tmpbuf))
|
|
return -EAI_MEMORY;
|
|
}
|
|
|
|
if (rc == 0)
|
|
{
|
|
if (h != NULL)
|
|
{
|
|
/* We found data, convert it. RES->AT from the conversion will
|
|
either be an allocated block or NULL, both of which are safe to
|
|
pass to free (). */
|
|
if (!convert_hostent_to_gaih_addrtuple (req, AF_INET, h, res))
|
|
return -EAI_MEMORY;
|
|
|
|
res->free_at = true;
|
|
return 0;
|
|
}
|
|
if (h_errno == NO_DATA)
|
|
return -EAI_NODATA;
|
|
|
|
return -EAI_NONAME;
|
|
}
|
|
|
|
if (h_errno == NETDB_INTERNAL)
|
|
return -EAI_SYSTEM;
|
|
if (h_errno == TRY_AGAIN)
|
|
return -EAI_AGAIN;
|
|
|
|
/* We made requests but they turned out no data.
|
|
The name is known, though. */
|
|
return -EAI_NODATA;
|
|
}
|
|
|
|
/* Add local address information into RES. RES->AT is assumed to have enough
|
|
space for two tuples and is zeroed out. */
|
|
|
|
static void
|
|
get_local_addresses (const struct addrinfo *req, struct gaih_result *res)
|
|
{
|
|
struct gaih_addrtuple *atr = res->at;
|
|
if (req->ai_family == AF_UNSPEC)
|
|
res->at->next = res->at + 1;
|
|
|
|
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
|
|
{
|
|
res->at->family = AF_INET6;
|
|
if ((req->ai_flags & AI_PASSIVE) == 0)
|
|
memcpy (res->at->addr, &in6addr_loopback, sizeof (struct in6_addr));
|
|
atr = res->at->next;
|
|
}
|
|
|
|
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
|
|
{
|
|
atr->family = AF_INET;
|
|
if ((req->ai_flags & AI_PASSIVE) == 0)
|
|
atr->addr[0] = htonl (INADDR_LOOPBACK);
|
|
}
|
|
}
|
|
|
|
/* Generate results in PAI and its count in NADDRS. Return 0 on success or an
|
|
error code on failure. */
|
|
|
|
static int
|
|
generate_addrinfo (const struct addrinfo *req, struct gaih_result *res,
|
|
const struct gaih_servtuple *st, struct addrinfo **pai,
|
|
unsigned int *naddrs)
|
|
{
|
|
size_t socklen;
|
|
sa_family_t family;
|
|
|
|
/* Buffer is the size of an unformatted IPv6 address in printable format. */
|
|
for (struct gaih_addrtuple *at = res->at; at != NULL; at = at->next)
|
|
{
|
|
family = at->family;
|
|
if (family == AF_INET6)
|
|
{
|
|
socklen = sizeof (struct sockaddr_in6);
|
|
|
|
/* If we looked up IPv4 mapped address discard them here if
|
|
the caller isn't interested in all address and we have
|
|
found at least one IPv6 address. */
|
|
if (res->got_ipv6
|
|
&& (req->ai_flags & (AI_V4MAPPED|AI_ALL)) == AI_V4MAPPED
|
|
&& IN6_IS_ADDR_V4MAPPED (at->addr))
|
|
continue;
|
|
}
|
|
else
|
|
socklen = sizeof (struct sockaddr_in);
|
|
|
|
for (int i = 0; st[i].set; i++)
|
|
{
|
|
struct addrinfo *ai;
|
|
ai = *pai = malloc (sizeof (struct addrinfo) + socklen);
|
|
if (ai == NULL)
|
|
return -EAI_MEMORY;
|
|
|
|
ai->ai_flags = req->ai_flags;
|
|
ai->ai_family = family;
|
|
ai->ai_socktype = st[i].socktype;
|
|
ai->ai_protocol = st[i].protocol;
|
|
ai->ai_addrlen = socklen;
|
|
ai->ai_addr = (void *) (ai + 1);
|
|
|
|
/* We only add the canonical name once. */
|
|
ai->ai_canonname = res->canon;
|
|
res->canon = NULL;
|
|
|
|
#ifdef _HAVE_SA_LEN
|
|
ai->ai_addr->sa_len = socklen;
|
|
#endif /* _HAVE_SA_LEN */
|
|
ai->ai_addr->sa_family = family;
|
|
|
|
/* In case of an allocation error the list must be NULL
|
|
terminated. */
|
|
ai->ai_next = NULL;
|
|
|
|
if (family == AF_INET6)
|
|
{
|
|
struct sockaddr_in6 *sin6p = (struct sockaddr_in6 *) ai->ai_addr;
|
|
sin6p->sin6_port = st[i].port;
|
|
sin6p->sin6_flowinfo = 0;
|
|
memcpy (&sin6p->sin6_addr, at->addr, sizeof (struct in6_addr));
|
|
sin6p->sin6_scope_id = at->scopeid;
|
|
}
|
|
else
|
|
{
|
|
struct sockaddr_in *sinp = (struct sockaddr_in *) ai->ai_addr;
|
|
sinp->sin_port = st[i].port;
|
|
memcpy (&sinp->sin_addr, at->addr, sizeof (struct in_addr));
|
|
memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
|
|
}
|
|
|
|
pai = &(ai->ai_next);
|
|
}
|
|
|
|
++*naddrs;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
gaih_inet (const char *name, const struct gaih_service *service,
|
|
const struct addrinfo *req, struct addrinfo **pai,
|
|
unsigned int *naddrs, struct scratch_buffer *tmpbuf)
|
|
{
|
|
struct gaih_servtuple st[sizeof (gaih_inet_typeproto)
|
|
/ sizeof (struct gaih_typeproto)] = {0};
|
|
|
|
const char *orig_name = name;
|
|
|
|
int rc;
|
|
if ((rc = get_servtuples (service, req, st, tmpbuf)) != 0)
|
|
return rc;
|
|
|
|
bool malloc_name = false;
|
|
struct gaih_addrtuple *addrmem = NULL;
|
|
int result = 0;
|
|
|
|
struct gaih_result res = {0};
|
|
struct gaih_addrtuple local_at[2] = {0};
|
|
|
|
res.at = local_at;
|
|
|
|
if (__glibc_unlikely (name == NULL))
|
|
{
|
|
get_local_addresses (req, &res);
|
|
goto process_list;
|
|
}
|
|
|
|
if (req->ai_flags & AI_IDN)
|
|
{
|
|
char *out;
|
|
result = __idna_to_dns_encoding (name, &out);
|
|
if (result != 0)
|
|
return -result;
|
|
name = out;
|
|
malloc_name = true;
|
|
}
|
|
|
|
if ((result = text_to_binary_address (name, req, &res)) != 0)
|
|
goto free_and_return;
|
|
else if (res.at != NULL)
|
|
goto process_list;
|
|
|
|
if ((result = try_simple_gethostbyname (name, req, tmpbuf, &res)) != 0)
|
|
goto free_and_return;
|
|
else if (res.at != NULL)
|
|
goto process_list;
|
|
|
|
#ifdef USE_NSCD
|
|
if ((result = get_nscd_addresses (name, req, &res)) != 0)
|
|
goto free_and_return;
|
|
else if (res.at != NULL)
|
|
goto process_list;
|
|
#endif
|
|
|
|
if ((result = get_nss_addresses (name, req, tmpbuf, &res)) != 0)
|
|
goto free_and_return;
|
|
else if (res.at != NULL)
|
|
goto process_list;
|
|
|
|
/* None of the lookups worked, so name not found. */
|
|
result = -EAI_NONAME;
|
|
goto free_and_return;
|
|
|
|
process_list:
|
|
/* Set up the canonical name if we need it. */
|
|
if ((result = process_canonname (req, orig_name, &res)) != 0)
|
|
goto free_and_return;
|
|
|
|
result = generate_addrinfo (req, &res, st, pai, naddrs);
|
|
|
|
free_and_return:
|
|
if (malloc_name)
|
|
free ((char *) name);
|
|
free (addrmem);
|
|
if (res.free_at)
|
|
free (res.at);
|
|
free (res.canon);
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
struct sort_result
|
|
{
|
|
struct addrinfo *dest_addr;
|
|
/* Using sockaddr_storage is for now overkill. We only support IPv4
|
|
and IPv6 so far. If this changes at some point we can adjust the
|
|
type here. */
|
|
struct sockaddr_in6 source_addr;
|
|
uint8_t source_addr_len;
|
|
bool got_source_addr;
|
|
uint8_t source_addr_flags;
|
|
uint8_t prefixlen;
|
|
uint32_t index;
|
|
int32_t native;
|
|
};
|
|
|
|
struct sort_result_combo
|
|
{
|
|
struct sort_result *results;
|
|
int nresults;
|
|
};
|
|
|
|
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
# define htonl_c(n) n
|
|
#else
|
|
# define htonl_c(n) __bswap_constant_32 (n)
|
|
#endif
|
|
|
|
static const struct scopeentry
|
|
{
|
|
union
|
|
{
|
|
char addr[4];
|
|
uint32_t addr32;
|
|
};
|
|
uint32_t netmask;
|
|
int32_t scope;
|
|
} default_scopes[] =
|
|
{
|
|
/* Link-local addresses: scope 2. */
|
|
{ { { 169, 254, 0, 0 } }, htonl_c (0xffff0000), 2 },
|
|
{ { { 127, 0, 0, 0 } }, htonl_c (0xff000000), 2 },
|
|
/* Default: scope 14. */
|
|
{ { { 0, 0, 0, 0 } }, htonl_c (0x00000000), 14 }
|
|
};
|
|
|
|
/* The label table. */
|
|
static const struct scopeentry *scopes;
|
|
|
|
|
|
static int
|
|
get_scope (const struct sockaddr_in6 *in6)
|
|
{
|
|
int scope;
|
|
if (in6->sin6_family == PF_INET6)
|
|
{
|
|
if (! IN6_IS_ADDR_MULTICAST (&in6->sin6_addr))
|
|
{
|
|
if (IN6_IS_ADDR_LINKLOCAL (&in6->sin6_addr)
|
|
/* RFC 4291 2.5.3 says that the loopback address is to be
|
|
treated like a link-local address. */
|
|
|| IN6_IS_ADDR_LOOPBACK (&in6->sin6_addr))
|
|
scope = 2;
|
|
else if (IN6_IS_ADDR_SITELOCAL (&in6->sin6_addr))
|
|
scope = 5;
|
|
else
|
|
/* XXX Is this the correct default behavior? */
|
|
scope = 14;
|
|
}
|
|
else
|
|
scope = in6->sin6_addr.s6_addr[1] & 0xf;
|
|
}
|
|
else if (in6->sin6_family == PF_INET)
|
|
{
|
|
const struct sockaddr_in *in = (const struct sockaddr_in *) in6;
|
|
|
|
size_t cnt = 0;
|
|
while (1)
|
|
{
|
|
if ((in->sin_addr.s_addr & scopes[cnt].netmask)
|
|
== scopes[cnt].addr32)
|
|
return scopes[cnt].scope;
|
|
|
|
++cnt;
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
else
|
|
/* XXX What is a good default? */
|
|
scope = 15;
|
|
|
|
return scope;
|
|
}
|
|
|
|
|
|
struct prefixentry
|
|
{
|
|
struct in6_addr prefix;
|
|
unsigned int bits;
|
|
int val;
|
|
};
|
|
|
|
|
|
/* The label table. */
|
|
static const struct prefixentry *labels;
|
|
|
|
/* Default labels. */
|
|
static const struct prefixentry default_labels[] =
|
|
{
|
|
/* See RFC 3484 for the details. */
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } }
|
|
}, 128, 0 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 16, 2 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 96, 3 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 96, 4 },
|
|
/* The next two entries differ from RFC 3484. We need to treat
|
|
IPv6 site-local addresses special because they are never NATed,
|
|
unlike site-locale IPv4 addresses. If this would not happen, on
|
|
machines which have only IPv4 and IPv6 site-local addresses, the
|
|
sorting would prefer the IPv6 site-local addresses, causing
|
|
unnecessary delays when trying to connect to a global IPv6 address
|
|
through a site-local IPv6 address. */
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0xfe, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 10, 5 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0xfc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 7, 6 },
|
|
/* Additional rule for Teredo tunnels. */
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x20, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 32, 7 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 0, 1 }
|
|
};
|
|
|
|
|
|
/* The precedence table. */
|
|
static const struct prefixentry *precedence;
|
|
|
|
/* The default precedences. */
|
|
static const struct prefixentry default_precedence[] =
|
|
{
|
|
/* See RFC 3484 for the details. */
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 } }
|
|
}, 128, 50 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x20, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 16, 30 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 96, 20 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 96, 10 },
|
|
{ { .__in6_u
|
|
= { .__u6_addr8 = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } }
|
|
}, 0, 40 }
|
|
};
|
|
|
|
|
|
static int
|
|
match_prefix (const struct sockaddr_in6 *in6,
|
|
const struct prefixentry *list, int default_val)
|
|
{
|
|
int idx;
|
|
struct sockaddr_in6 in6_mem;
|
|
|
|
if (in6->sin6_family == PF_INET)
|
|
{
|
|
const struct sockaddr_in *in = (const struct sockaddr_in *) in6;
|
|
|
|
/* Construct a V4-to-6 mapped address. */
|
|
in6_mem.sin6_family = PF_INET6;
|
|
in6_mem.sin6_port = in->sin_port;
|
|
in6_mem.sin6_flowinfo = 0;
|
|
memset (&in6_mem.sin6_addr, '\0', sizeof (in6_mem.sin6_addr));
|
|
in6_mem.sin6_addr.s6_addr16[5] = 0xffff;
|
|
in6_mem.sin6_addr.s6_addr32[3] = in->sin_addr.s_addr;
|
|
in6_mem.sin6_scope_id = 0;
|
|
|
|
in6 = &in6_mem;
|
|
}
|
|
else if (in6->sin6_family != PF_INET6)
|
|
return default_val;
|
|
|
|
for (idx = 0; ; ++idx)
|
|
{
|
|
unsigned int bits = list[idx].bits;
|
|
const uint8_t *mask = list[idx].prefix.s6_addr;
|
|
const uint8_t *val = in6->sin6_addr.s6_addr;
|
|
|
|
while (bits >= 8)
|
|
{
|
|
if (*mask != *val)
|
|
break;
|
|
|
|
++mask;
|
|
++val;
|
|
bits -= 8;
|
|
}
|
|
|
|
if (bits < 8)
|
|
{
|
|
if ((*mask & (0xff00 >> bits)) == (*val & (0xff00 >> bits)))
|
|
/* Match! */
|
|
break;
|
|
}
|
|
}
|
|
|
|
return list[idx].val;
|
|
}
|
|
|
|
|
|
static int
|
|
get_label (const struct sockaddr_in6 *in6)
|
|
{
|
|
/* XXX What is a good default value? */
|
|
return match_prefix (in6, labels, INT_MAX);
|
|
}
|
|
|
|
|
|
static int
|
|
get_precedence (const struct sockaddr_in6 *in6)
|
|
{
|
|
/* XXX What is a good default value? */
|
|
return match_prefix (in6, precedence, 0);
|
|
}
|
|
|
|
|
|
/* Find last bit set in a word. */
|
|
static int
|
|
fls (uint32_t a)
|
|
{
|
|
uint32_t mask;
|
|
int n;
|
|
for (n = 0, mask = 1 << 31; n < 32; mask >>= 1, ++n)
|
|
if ((a & mask) != 0)
|
|
break;
|
|
return n;
|
|
}
|
|
|
|
|
|
static int
|
|
rfc3484_sort (const void *p1, const void *p2, void *arg)
|
|
{
|
|
const size_t idx1 = *(const size_t *) p1;
|
|
const size_t idx2 = *(const size_t *) p2;
|
|
struct sort_result_combo *src = (struct sort_result_combo *) arg;
|
|
struct sort_result *a1 = &src->results[idx1];
|
|
struct sort_result *a2 = &src->results[idx2];
|
|
|
|
/* Rule 1: Avoid unusable destinations.
|
|
We have the got_source_addr flag set if the destination is reachable. */
|
|
if (a1->got_source_addr && ! a2->got_source_addr)
|
|
return -1;
|
|
if (! a1->got_source_addr && a2->got_source_addr)
|
|
return 1;
|
|
|
|
|
|
/* Rule 2: Prefer matching scope. Only interesting if both
|
|
destination addresses are IPv6. */
|
|
int a1_dst_scope
|
|
= get_scope ((struct sockaddr_in6 *) a1->dest_addr->ai_addr);
|
|
|
|
int a2_dst_scope
|
|
= get_scope ((struct sockaddr_in6 *) a2->dest_addr->ai_addr);
|
|
|
|
if (a1->got_source_addr)
|
|
{
|
|
int a1_src_scope = get_scope (&a1->source_addr);
|
|
int a2_src_scope = get_scope (&a2->source_addr);
|
|
|
|
if (a1_dst_scope == a1_src_scope && a2_dst_scope != a2_src_scope)
|
|
return -1;
|
|
if (a1_dst_scope != a1_src_scope && a2_dst_scope == a2_src_scope)
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Rule 3: Avoid deprecated addresses. */
|
|
if (a1->got_source_addr)
|
|
{
|
|
if (!(a1->source_addr_flags & in6ai_deprecated)
|
|
&& (a2->source_addr_flags & in6ai_deprecated))
|
|
return -1;
|
|
if ((a1->source_addr_flags & in6ai_deprecated)
|
|
&& !(a2->source_addr_flags & in6ai_deprecated))
|
|
return 1;
|
|
}
|
|
|
|
/* Rule 4: Prefer home addresses. */
|
|
if (a1->got_source_addr)
|
|
{
|
|
if (!(a1->source_addr_flags & in6ai_homeaddress)
|
|
&& (a2->source_addr_flags & in6ai_homeaddress))
|
|
return 1;
|
|
if ((a1->source_addr_flags & in6ai_homeaddress)
|
|
&& !(a2->source_addr_flags & in6ai_homeaddress))
|
|
return -1;
|
|
}
|
|
|
|
/* Rule 5: Prefer matching label. */
|
|
if (a1->got_source_addr)
|
|
{
|
|
int a1_dst_label
|
|
= get_label ((struct sockaddr_in6 *) a1->dest_addr->ai_addr);
|
|
int a1_src_label = get_label (&a1->source_addr);
|
|
|
|
int a2_dst_label
|
|
= get_label ((struct sockaddr_in6 *) a2->dest_addr->ai_addr);
|
|
int a2_src_label = get_label (&a2->source_addr);
|
|
|
|
if (a1_dst_label == a1_src_label && a2_dst_label != a2_src_label)
|
|
return -1;
|
|
if (a1_dst_label != a1_src_label && a2_dst_label == a2_src_label)
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Rule 6: Prefer higher precedence. */
|
|
int a1_prec
|
|
= get_precedence ((struct sockaddr_in6 *) a1->dest_addr->ai_addr);
|
|
int a2_prec
|
|
= get_precedence ((struct sockaddr_in6 *) a2->dest_addr->ai_addr);
|
|
|
|
if (a1_prec > a2_prec)
|
|
return -1;
|
|
if (a1_prec < a2_prec)
|
|
return 1;
|
|
|
|
|
|
/* Rule 7: Prefer native transport. */
|
|
if (a1->got_source_addr)
|
|
{
|
|
/* The same interface index means the same interface which means
|
|
there is no difference in transport. This should catch many
|
|
(most?) cases. */
|
|
if (a1->index != a2->index)
|
|
{
|
|
int a1_native = a1->native;
|
|
int a2_native = a2->native;
|
|
|
|
if (a1_native == -1 || a2_native == -1)
|
|
{
|
|
uint32_t a1_index;
|
|
if (a1_native == -1)
|
|
{
|
|
/* If we do not have the information use 'native' as
|
|
the default. */
|
|
a1_native = 0;
|
|
a1_index = a1->index;
|
|
}
|
|
else
|
|
a1_index = 0xffffffffu;
|
|
|
|
uint32_t a2_index;
|
|
if (a2_native == -1)
|
|
{
|
|
/* If we do not have the information use 'native' as
|
|
the default. */
|
|
a2_native = 0;
|
|
a2_index = a2->index;
|
|
}
|
|
else
|
|
a2_index = 0xffffffffu;
|
|
|
|
__check_native (a1_index, &a1_native, a2_index, &a2_native);
|
|
|
|
/* Fill in the results in all the records. */
|
|
for (int i = 0; i < src->nresults; ++i)
|
|
if (a1_index != -1 && src->results[i].index == a1_index)
|
|
{
|
|
assert (src->results[i].native == -1
|
|
|| src->results[i].native == a1_native);
|
|
src->results[i].native = a1_native;
|
|
}
|
|
else if (a2_index != -1 && src->results[i].index == a2_index)
|
|
{
|
|
assert (src->results[i].native == -1
|
|
|| src->results[i].native == a2_native);
|
|
src->results[i].native = a2_native;
|
|
}
|
|
}
|
|
|
|
if (a1_native && !a2_native)
|
|
return -1;
|
|
if (!a1_native && a2_native)
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
/* Rule 8: Prefer smaller scope. */
|
|
if (a1_dst_scope < a2_dst_scope)
|
|
return -1;
|
|
if (a1_dst_scope > a2_dst_scope)
|
|
return 1;
|
|
|
|
|
|
/* Rule 9: Use longest matching prefix. */
|
|
if (a1->got_source_addr
|
|
&& a1->dest_addr->ai_family == a2->dest_addr->ai_family)
|
|
{
|
|
int bit1 = 0;
|
|
int bit2 = 0;
|
|
|
|
if (a1->dest_addr->ai_family == PF_INET)
|
|
{
|
|
assert (a1->source_addr.sin6_family == PF_INET);
|
|
assert (a2->source_addr.sin6_family == PF_INET);
|
|
|
|
/* Outside of subnets, as defined by the network masks,
|
|
common address prefixes for IPv4 addresses make no sense.
|
|
So, define a non-zero value only if source and
|
|
destination address are on the same subnet. */
|
|
struct sockaddr_in *in1_dst
|
|
= (struct sockaddr_in *) a1->dest_addr->ai_addr;
|
|
in_addr_t in1_dst_addr = ntohl (in1_dst->sin_addr.s_addr);
|
|
struct sockaddr_in *in1_src
|
|
= (struct sockaddr_in *) &a1->source_addr;
|
|
in_addr_t in1_src_addr = ntohl (in1_src->sin_addr.s_addr);
|
|
in_addr_t netmask1 = 0xffffffffu << (32 - a1->prefixlen);
|
|
|
|
if ((in1_src_addr & netmask1) == (in1_dst_addr & netmask1))
|
|
bit1 = fls (in1_dst_addr ^ in1_src_addr);
|
|
|
|
struct sockaddr_in *in2_dst
|
|
= (struct sockaddr_in *) a2->dest_addr->ai_addr;
|
|
in_addr_t in2_dst_addr = ntohl (in2_dst->sin_addr.s_addr);
|
|
struct sockaddr_in *in2_src
|
|
= (struct sockaddr_in *) &a2->source_addr;
|
|
in_addr_t in2_src_addr = ntohl (in2_src->sin_addr.s_addr);
|
|
in_addr_t netmask2 = 0xffffffffu << (32 - a2->prefixlen);
|
|
|
|
if ((in2_src_addr & netmask2) == (in2_dst_addr & netmask2))
|
|
bit2 = fls (in2_dst_addr ^ in2_src_addr);
|
|
}
|
|
else if (a1->dest_addr->ai_family == PF_INET6)
|
|
{
|
|
assert (a1->source_addr.sin6_family == PF_INET6);
|
|
assert (a2->source_addr.sin6_family == PF_INET6);
|
|
|
|
struct sockaddr_in6 *in1_dst;
|
|
struct sockaddr_in6 *in1_src;
|
|
struct sockaddr_in6 *in2_dst;
|
|
struct sockaddr_in6 *in2_src;
|
|
|
|
in1_dst = (struct sockaddr_in6 *) a1->dest_addr->ai_addr;
|
|
in1_src = (struct sockaddr_in6 *) &a1->source_addr;
|
|
in2_dst = (struct sockaddr_in6 *) a2->dest_addr->ai_addr;
|
|
in2_src = (struct sockaddr_in6 *) &a2->source_addr;
|
|
|
|
int i;
|
|
for (i = 0; i < 4; ++i)
|
|
if (in1_dst->sin6_addr.s6_addr32[i]
|
|
!= in1_src->sin6_addr.s6_addr32[i]
|
|
|| (in2_dst->sin6_addr.s6_addr32[i]
|
|
!= in2_src->sin6_addr.s6_addr32[i]))
|
|
break;
|
|
|
|
if (i < 4)
|
|
{
|
|
bit1 = fls (ntohl (in1_dst->sin6_addr.s6_addr32[i]
|
|
^ in1_src->sin6_addr.s6_addr32[i]));
|
|
bit2 = fls (ntohl (in2_dst->sin6_addr.s6_addr32[i]
|
|
^ in2_src->sin6_addr.s6_addr32[i]));
|
|
}
|
|
}
|
|
|
|
if (bit1 > bit2)
|
|
return -1;
|
|
if (bit1 < bit2)
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* Rule 10: Otherwise, leave the order unchanged. To ensure this
|
|
compare with the value indicating the order in which the entries
|
|
have been received from the services. NB: no two entries can have
|
|
the same order so the test will never return zero. */
|
|
return idx1 < idx2 ? -1 : 1;
|
|
}
|
|
|
|
|
|
static int
|
|
in6aicmp (const void *p1, const void *p2)
|
|
{
|
|
struct in6addrinfo *a1 = (struct in6addrinfo *) p1;
|
|
struct in6addrinfo *a2 = (struct in6addrinfo *) p2;
|
|
|
|
return memcmp (a1->addr, a2->addr, sizeof (a1->addr));
|
|
}
|
|
|
|
|
|
/* Name of the config file for RFC 3484 sorting (for now). */
|
|
#define GAICONF_FNAME "/etc/gai.conf"
|
|
|
|
|
|
/* Non-zero if we are supposed to reload the config file automatically
|
|
whenever it changed. */
|
|
static int gaiconf_reload_flag;
|
|
|
|
/* Non-zero if gaiconf_reload_flag was ever set to true. */
|
|
static int gaiconf_reload_flag_ever_set;
|
|
|
|
/* Last modification time. */
|
|
#ifdef _STATBUF_ST_NSEC
|
|
|
|
static struct __timespec64 gaiconf_mtime;
|
|
|
|
static inline void
|
|
save_gaiconf_mtime (const struct __stat64_t64 *st)
|
|
{
|
|
gaiconf_mtime = (struct __timespec64) { st->st_mtim.tv_sec,
|
|
st->st_mtim.tv_nsec };
|
|
}
|
|
|
|
static inline bool
|
|
check_gaiconf_mtime (const struct __stat64_t64 *st)
|
|
{
|
|
return (st->st_mtim.tv_sec == gaiconf_mtime.tv_sec
|
|
&& st->st_mtim.tv_nsec == gaiconf_mtime.tv_nsec);
|
|
}
|
|
|
|
#else
|
|
|
|
static time_t gaiconf_mtime;
|
|
|
|
static inline void
|
|
save_gaiconf_mtime (const struct __stat64_t64 *st)
|
|
{
|
|
gaiconf_mtime = st->st_mtime;
|
|
}
|
|
|
|
static inline bool
|
|
check_gaiconf_mtime (const struct __stat64_t64 *st)
|
|
{
|
|
return st->st_mtime == gaiconf_mtime;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
libc_freeres_fn(fini)
|
|
{
|
|
if (labels != default_labels)
|
|
{
|
|
const struct prefixentry *old = labels;
|
|
labels = default_labels;
|
|
free ((void *) old);
|
|
}
|
|
|
|
if (precedence != default_precedence)
|
|
{
|
|
const struct prefixentry *old = precedence;
|
|
precedence = default_precedence;
|
|
free ((void *) old);
|
|
}
|
|
|
|
if (scopes != default_scopes)
|
|
{
|
|
const struct scopeentry *old = scopes;
|
|
scopes = default_scopes;
|
|
free ((void *) old);
|
|
}
|
|
}
|
|
|
|
|
|
struct prefixlist
|
|
{
|
|
struct prefixentry entry;
|
|
struct prefixlist *next;
|
|
};
|
|
|
|
|
|
struct scopelist
|
|
{
|
|
struct scopeentry entry;
|
|
struct scopelist *next;
|
|
};
|
|
|
|
|
|
static void
|
|
free_prefixlist (struct prefixlist *list)
|
|
{
|
|
while (list != NULL)
|
|
{
|
|
struct prefixlist *oldp = list;
|
|
list = list->next;
|
|
free (oldp);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
free_scopelist (struct scopelist *list)
|
|
{
|
|
while (list != NULL)
|
|
{
|
|
struct scopelist *oldp = list;
|
|
list = list->next;
|
|
free (oldp);
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
prefixcmp (const void *p1, const void *p2)
|
|
{
|
|
const struct prefixentry *e1 = (const struct prefixentry *) p1;
|
|
const struct prefixentry *e2 = (const struct prefixentry *) p2;
|
|
|
|
if (e1->bits < e2->bits)
|
|
return 1;
|
|
if (e1->bits == e2->bits)
|
|
return 0;
|
|
return -1;
|
|
}
|
|
|
|
|
|
static int
|
|
scopecmp (const void *p1, const void *p2)
|
|
{
|
|
const struct scopeentry *e1 = (const struct scopeentry *) p1;
|
|
const struct scopeentry *e2 = (const struct scopeentry *) p2;
|
|
|
|
if (e1->netmask > e2->netmask)
|
|
return -1;
|
|
if (e1->netmask == e2->netmask)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static bool
|
|
add_prefixlist (struct prefixlist **listp, size_t *lenp, bool *nullbitsp,
|
|
char *val1, char *val2, char **pos)
|
|
{
|
|
struct in6_addr prefix;
|
|
unsigned long int bits;
|
|
unsigned long int val;
|
|
char *endp;
|
|
|
|
bits = 128;
|
|
__set_errno (0);
|
|
char *cp = strchr (val1, '/');
|
|
if (cp != NULL)
|
|
*cp++ = '\0';
|
|
*pos = cp;
|
|
if (inet_pton (AF_INET6, val1, &prefix)
|
|
&& (cp == NULL
|
|
|| (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
|
|
|| errno != ERANGE)
|
|
&& *endp == '\0'
|
|
&& bits <= 128
|
|
&& ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
|
|
|| errno != ERANGE)
|
|
&& *endp == '\0'
|
|
&& val <= INT_MAX)
|
|
{
|
|
struct prefixlist *newp = malloc (sizeof (*newp));
|
|
if (newp == NULL)
|
|
return false;
|
|
|
|
memcpy (&newp->entry.prefix, &prefix, sizeof (prefix));
|
|
newp->entry.bits = bits;
|
|
newp->entry.val = val;
|
|
newp->next = *listp;
|
|
*listp = newp;
|
|
++*lenp;
|
|
*nullbitsp |= bits == 0;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
add_scopelist (struct scopelist **listp, size_t *lenp, bool *nullbitsp,
|
|
const struct in6_addr *prefixp, unsigned long int bits,
|
|
unsigned long int val)
|
|
{
|
|
struct scopelist *newp = malloc (sizeof (*newp));
|
|
if (newp == NULL)
|
|
return false;
|
|
|
|
newp->entry.netmask = htonl (bits != 96 ? (0xffffffff << (128 - bits)) : 0);
|
|
newp->entry.addr32 = (prefixp->s6_addr32[3] & newp->entry.netmask);
|
|
newp->entry.scope = val;
|
|
newp->next = *listp;
|
|
*listp = newp;
|
|
++*lenp;
|
|
*nullbitsp |= bits == 96;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void
|
|
gaiconf_init (void)
|
|
{
|
|
struct prefixlist *labellist = NULL;
|
|
size_t nlabellist = 0;
|
|
bool labellist_nullbits = false;
|
|
struct prefixlist *precedencelist = NULL;
|
|
size_t nprecedencelist = 0;
|
|
bool precedencelist_nullbits = false;
|
|
struct scopelist *scopelist = NULL;
|
|
size_t nscopelist = 0;
|
|
bool scopelist_nullbits = false;
|
|
|
|
FILE *fp = fopen (GAICONF_FNAME, "rce");
|
|
if (fp == NULL)
|
|
goto no_file;
|
|
|
|
struct __stat64_t64 st;
|
|
if (__fstat64_time64 (fileno (fp), &st) != 0)
|
|
{
|
|
fclose (fp);
|
|
goto no_file;
|
|
}
|
|
|
|
char *line = NULL;
|
|
size_t linelen = 0;
|
|
|
|
__fsetlocking (fp, FSETLOCKING_BYCALLER);
|
|
|
|
while (!feof_unlocked (fp))
|
|
{
|
|
ssize_t n = __getline (&line, &linelen, fp);
|
|
if (n <= 0)
|
|
break;
|
|
|
|
/* Handle comments. No escaping possible so this is easy. */
|
|
char *cp = strchr (line, '#');
|
|
if (cp != NULL)
|
|
*cp = '\0';
|
|
|
|
cp = line;
|
|
while (isspace (*cp))
|
|
++cp;
|
|
|
|
char *cmd = cp;
|
|
while (*cp != '\0' && !isspace (*cp))
|
|
++cp;
|
|
size_t cmdlen = cp - cmd;
|
|
|
|
if (*cp != '\0')
|
|
*cp++ = '\0';
|
|
while (isspace (*cp))
|
|
++cp;
|
|
|
|
char *val1 = cp;
|
|
while (*cp != '\0' && !isspace (*cp))
|
|
++cp;
|
|
size_t val1len = cp - cmd;
|
|
|
|
/* We always need at least two values. */
|
|
if (val1len == 0)
|
|
continue;
|
|
|
|
if (*cp != '\0')
|
|
*cp++ = '\0';
|
|
while (isspace (*cp))
|
|
++cp;
|
|
|
|
char *val2 = cp;
|
|
while (*cp != '\0' && !isspace (*cp))
|
|
++cp;
|
|
|
|
/* Ignore the rest of the line. */
|
|
*cp = '\0';
|
|
|
|
switch (cmdlen)
|
|
{
|
|
case 5:
|
|
if (strcmp (cmd, "label") == 0)
|
|
{
|
|
if (!add_prefixlist (&labellist, &nlabellist,
|
|
&labellist_nullbits, val1, val2, &cp))
|
|
{
|
|
free (line);
|
|
fclose (fp);
|
|
goto no_file;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 6:
|
|
if (strcmp (cmd, "reload") == 0)
|
|
{
|
|
gaiconf_reload_flag = strcmp (val1, "yes") == 0;
|
|
if (gaiconf_reload_flag)
|
|
gaiconf_reload_flag_ever_set = 1;
|
|
}
|
|
break;
|
|
|
|
case 7:
|
|
if (strcmp (cmd, "scopev4") == 0)
|
|
{
|
|
struct in6_addr prefix;
|
|
unsigned long int bits;
|
|
unsigned long int val;
|
|
char *endp;
|
|
|
|
bits = 32;
|
|
__set_errno (0);
|
|
cp = strchr (val1, '/');
|
|
if (cp != NULL)
|
|
*cp++ = '\0';
|
|
if (inet_pton (AF_INET6, val1, &prefix))
|
|
{
|
|
bits = 128;
|
|
if (IN6_IS_ADDR_V4MAPPED (&prefix)
|
|
&& (cp == NULL
|
|
|| (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
|
|
|| errno != ERANGE)
|
|
&& *endp == '\0'
|
|
&& bits >= 96
|
|
&& bits <= 128
|
|
&& ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
|
|
|| errno != ERANGE)
|
|
&& *endp == '\0'
|
|
&& val <= INT_MAX)
|
|
{
|
|
if (!add_scopelist (&scopelist, &nscopelist,
|
|
&scopelist_nullbits, &prefix,
|
|
bits, val))
|
|
{
|
|
free (line);
|
|
fclose (fp);
|
|
goto no_file;
|
|
}
|
|
}
|
|
}
|
|
else if (inet_pton (AF_INET, val1, &prefix.s6_addr32[3])
|
|
&& (cp == NULL
|
|
|| (bits = strtoul (cp, &endp, 10)) != ULONG_MAX
|
|
|| errno != ERANGE)
|
|
&& *endp == '\0'
|
|
&& bits <= 32
|
|
&& ((val = strtoul (val2, &endp, 10)) != ULONG_MAX
|
|
|| errno != ERANGE)
|
|
&& *endp == '\0'
|
|
&& val <= INT_MAX)
|
|
{
|
|
if (!add_scopelist (&scopelist, &nscopelist,
|
|
&scopelist_nullbits, &prefix,
|
|
bits + 96, val))
|
|
{
|
|
free (line);
|
|
fclose (fp);
|
|
goto no_file;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 10:
|
|
if (strcmp (cmd, "precedence") == 0)
|
|
{
|
|
if (!add_prefixlist (&precedencelist, &nprecedencelist,
|
|
&precedencelist_nullbits, val1, val2,
|
|
&cp))
|
|
{
|
|
free (line);
|
|
fclose (fp);
|
|
goto no_file;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
free (line);
|
|
|
|
fclose (fp);
|
|
|
|
/* Create the array for the labels. */
|
|
struct prefixentry *new_labels;
|
|
if (nlabellist > 0)
|
|
{
|
|
if (!labellist_nullbits)
|
|
++nlabellist;
|
|
new_labels = malloc (nlabellist * sizeof (*new_labels));
|
|
if (new_labels == NULL)
|
|
goto no_file;
|
|
|
|
int i = nlabellist;
|
|
if (!labellist_nullbits)
|
|
{
|
|
--i;
|
|
memset (&new_labels[i].prefix, '\0', sizeof (struct in6_addr));
|
|
new_labels[i].bits = 0;
|
|
new_labels[i].val = 1;
|
|
}
|
|
|
|
struct prefixlist *l = labellist;
|
|
while (i-- > 0)
|
|
{
|
|
new_labels[i] = l->entry;
|
|
l = l->next;
|
|
}
|
|
free_prefixlist (labellist);
|
|
labellist = NULL;
|
|
|
|
/* Sort the entries so that the most specific ones are at
|
|
the beginning. */
|
|
qsort (new_labels, nlabellist, sizeof (*new_labels), prefixcmp);
|
|
}
|
|
else
|
|
new_labels = (struct prefixentry *) default_labels;
|
|
|
|
struct prefixentry *new_precedence;
|
|
if (nprecedencelist > 0)
|
|
{
|
|
if (!precedencelist_nullbits)
|
|
++nprecedencelist;
|
|
new_precedence = malloc (nprecedencelist * sizeof (*new_precedence));
|
|
if (new_precedence == NULL)
|
|
{
|
|
if (new_labels != default_labels)
|
|
free (new_labels);
|
|
goto no_file;
|
|
}
|
|
|
|
int i = nprecedencelist;
|
|
if (!precedencelist_nullbits)
|
|
{
|
|
--i;
|
|
memset (&new_precedence[i].prefix, '\0',
|
|
sizeof (struct in6_addr));
|
|
new_precedence[i].bits = 0;
|
|
new_precedence[i].val = 40;
|
|
}
|
|
|
|
struct prefixlist *l = precedencelist;
|
|
while (i-- > 0)
|
|
{
|
|
new_precedence[i] = l->entry;
|
|
l = l->next;
|
|
}
|
|
free_prefixlist (precedencelist);
|
|
precedencelist = NULL;
|
|
|
|
/* Sort the entries so that the most specific ones are at
|
|
the beginning. */
|
|
qsort (new_precedence, nprecedencelist, sizeof (*new_precedence),
|
|
prefixcmp);
|
|
}
|
|
else
|
|
new_precedence = (struct prefixentry *) default_precedence;
|
|
|
|
struct scopeentry *new_scopes;
|
|
if (nscopelist > 0)
|
|
{
|
|
if (!scopelist_nullbits)
|
|
++nscopelist;
|
|
new_scopes = malloc (nscopelist * sizeof (*new_scopes));
|
|
if (new_scopes == NULL)
|
|
{
|
|
if (new_labels != default_labels)
|
|
free (new_labels);
|
|
if (new_precedence != default_precedence)
|
|
free (new_precedence);
|
|
goto no_file;
|
|
}
|
|
|
|
int i = nscopelist;
|
|
if (!scopelist_nullbits)
|
|
{
|
|
--i;
|
|
new_scopes[i].addr32 = 0;
|
|
new_scopes[i].netmask = 0;
|
|
new_scopes[i].scope = 14;
|
|
}
|
|
|
|
struct scopelist *l = scopelist;
|
|
while (i-- > 0)
|
|
{
|
|
new_scopes[i] = l->entry;
|
|
l = l->next;
|
|
}
|
|
free_scopelist (scopelist);
|
|
|
|
/* Sort the entries so that the most specific ones are at
|
|
the beginning. */
|
|
qsort (new_scopes, nscopelist, sizeof (*new_scopes),
|
|
scopecmp);
|
|
}
|
|
else
|
|
new_scopes = (struct scopeentry *) default_scopes;
|
|
|
|
/* Now we are ready to replace the values. */
|
|
const struct prefixentry *old = labels;
|
|
labels = new_labels;
|
|
if (old != default_labels)
|
|
free ((void *) old);
|
|
|
|
old = precedence;
|
|
precedence = new_precedence;
|
|
if (old != default_precedence)
|
|
free ((void *) old);
|
|
|
|
const struct scopeentry *oldscope = scopes;
|
|
scopes = new_scopes;
|
|
if (oldscope != default_scopes)
|
|
free ((void *) oldscope);
|
|
|
|
save_gaiconf_mtime (&st);
|
|
return;
|
|
|
|
no_file:
|
|
free_prefixlist (labellist);
|
|
free_prefixlist (precedencelist);
|
|
free_scopelist (scopelist);
|
|
|
|
/* If we previously read the file but it is gone now, free the old data and
|
|
use the builtin one. Leave the reload flag alone. */
|
|
fini ();
|
|
}
|
|
|
|
|
|
static void
|
|
gaiconf_reload (void)
|
|
{
|
|
struct __stat64_t64 st;
|
|
if (__stat64_time64 (GAICONF_FNAME, &st) != 0
|
|
|| !check_gaiconf_mtime (&st))
|
|
gaiconf_init ();
|
|
}
|
|
|
|
static bool
|
|
try_connect (int *fdp, int *afp, struct sockaddr_in6 *source_addrp,
|
|
const struct sockaddr *addr, socklen_t addrlen, int family)
|
|
{
|
|
int fd = *fdp;
|
|
int af = *afp;
|
|
socklen_t sl = sizeof (*source_addrp);
|
|
|
|
while (true)
|
|
{
|
|
if (fd != -1 && __connect (fd, addr, addrlen) == 0
|
|
&& __getsockname (fd, (struct sockaddr *) source_addrp, &sl) == 0)
|
|
return true;
|
|
|
|
if (errno == EAFNOSUPPORT && af == AF_INET6 && family == AF_INET)
|
|
{
|
|
/* This could mean IPv6 sockets are IPv6-only. */
|
|
if (fd != -1)
|
|
__close_nocancel_nostatus (fd);
|
|
*afp = af = AF_INET;
|
|
*fdp = fd = __socket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC,
|
|
IPPROTO_IP);
|
|
continue;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
__builtin_unreachable ();
|
|
}
|
|
|
|
int
|
|
getaddrinfo (const char *name, const char *service,
|
|
const struct addrinfo *hints, struct addrinfo **pai)
|
|
{
|
|
int i = 0, last_i = 0;
|
|
int nresults = 0;
|
|
struct addrinfo *p = NULL;
|
|
struct gaih_service gaih_service, *pservice;
|
|
struct addrinfo local_hints;
|
|
|
|
if (name != NULL && name[0] == '*' && name[1] == 0)
|
|
name = NULL;
|
|
|
|
if (service != NULL && service[0] == '*' && service[1] == 0)
|
|
service = NULL;
|
|
|
|
if (name == NULL && service == NULL)
|
|
return EAI_NONAME;
|
|
|
|
if (hints == NULL)
|
|
hints = &default_hints;
|
|
|
|
if (hints->ai_flags
|
|
& ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST|AI_ADDRCONFIG|AI_V4MAPPED
|
|
|AI_IDN|AI_CANONIDN|DEPRECATED_AI_IDN
|
|
|AI_NUMERICSERV|AI_ALL))
|
|
return EAI_BADFLAGS;
|
|
|
|
if ((hints->ai_flags & AI_CANONNAME) && name == NULL)
|
|
return EAI_BADFLAGS;
|
|
|
|
if (hints->ai_family != AF_UNSPEC && hints->ai_family != AF_INET
|
|
&& hints->ai_family != AF_INET6)
|
|
return EAI_FAMILY;
|
|
|
|
struct in6addrinfo *in6ai = NULL;
|
|
size_t in6ailen = 0;
|
|
bool seen_ipv4 = false;
|
|
bool seen_ipv6 = false;
|
|
bool check_pf_called = false;
|
|
|
|
if (hints->ai_flags & AI_ADDRCONFIG)
|
|
{
|
|
/* We might need information about what interfaces are available.
|
|
Also determine whether we have IPv4 or IPv6 interfaces or both. We
|
|
cannot cache the results since new interfaces could be added at
|
|
any time. */
|
|
__check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
|
|
check_pf_called = true;
|
|
|
|
/* Now make a decision on what we return, if anything. */
|
|
if (hints->ai_family == PF_UNSPEC && (seen_ipv4 || seen_ipv6))
|
|
{
|
|
/* If we haven't seen both IPv4 and IPv6 interfaces we can
|
|
narrow down the search. */
|
|
if (seen_ipv4 != seen_ipv6)
|
|
{
|
|
local_hints = *hints;
|
|
local_hints.ai_family = seen_ipv4 ? PF_INET : PF_INET6;
|
|
hints = &local_hints;
|
|
}
|
|
}
|
|
else if ((hints->ai_family == PF_INET && ! seen_ipv4)
|
|
|| (hints->ai_family == PF_INET6 && ! seen_ipv6))
|
|
{
|
|
/* We cannot possibly return a valid answer. */
|
|
__free_in6ai (in6ai);
|
|
return EAI_NONAME;
|
|
}
|
|
}
|
|
|
|
if (service && service[0])
|
|
{
|
|
char *c;
|
|
gaih_service.name = service;
|
|
gaih_service.num = strtoul (gaih_service.name, &c, 10);
|
|
if (*c != '\0')
|
|
{
|
|
if (hints->ai_flags & AI_NUMERICSERV)
|
|
{
|
|
__free_in6ai (in6ai);
|
|
return EAI_NONAME;
|
|
}
|
|
|
|
gaih_service.num = -1;
|
|
}
|
|
|
|
pservice = &gaih_service;
|
|
}
|
|
else
|
|
pservice = NULL;
|
|
|
|
struct addrinfo **end = &p;
|
|
unsigned int naddrs = 0;
|
|
struct scratch_buffer tmpbuf;
|
|
|
|
scratch_buffer_init (&tmpbuf);
|
|
last_i = gaih_inet (name, pservice, hints, end, &naddrs, &tmpbuf);
|
|
scratch_buffer_free (&tmpbuf);
|
|
|
|
if (last_i != 0)
|
|
{
|
|
freeaddrinfo (p);
|
|
__free_in6ai (in6ai);
|
|
|
|
return -last_i;
|
|
}
|
|
|
|
while (*end)
|
|
{
|
|
end = &((*end)->ai_next);
|
|
++nresults;
|
|
}
|
|
|
|
if (naddrs > 1)
|
|
{
|
|
/* Read the config file. */
|
|
__libc_once_define (static, once);
|
|
__typeof (once) old_once = once;
|
|
__libc_once (once, gaiconf_init);
|
|
/* Sort results according to RFC 3484. */
|
|
struct sort_result *results;
|
|
size_t *order;
|
|
struct addrinfo *q;
|
|
struct addrinfo *last = NULL;
|
|
char *canonname = NULL;
|
|
bool malloc_results;
|
|
size_t alloc_size = nresults * (sizeof (*results) + sizeof (size_t));
|
|
|
|
malloc_results
|
|
= !__libc_use_alloca (alloc_size);
|
|
if (malloc_results)
|
|
{
|
|
results = malloc (alloc_size);
|
|
if (results == NULL)
|
|
{
|
|
__free_in6ai (in6ai);
|
|
return EAI_MEMORY;
|
|
}
|
|
}
|
|
else
|
|
results = alloca (alloc_size);
|
|
order = (size_t *) (results + nresults);
|
|
|
|
/* Now we definitely need the interface information. */
|
|
if (! check_pf_called)
|
|
__check_pf (&seen_ipv4, &seen_ipv6, &in6ai, &in6ailen);
|
|
|
|
/* If we have information about deprecated and temporary addresses
|
|
sort the array now. */
|
|
if (in6ai != NULL)
|
|
qsort (in6ai, in6ailen, sizeof (*in6ai), in6aicmp);
|
|
|
|
int fd = -1;
|
|
int af = AF_UNSPEC;
|
|
|
|
for (i = 0, q = p; q != NULL; ++i, last = q, q = q->ai_next)
|
|
{
|
|
results[i].dest_addr = q;
|
|
results[i].native = -1;
|
|
order[i] = i;
|
|
|
|
/* If we just looked up the address for a different
|
|
protocol, reuse the result. */
|
|
if (last != NULL && last->ai_addrlen == q->ai_addrlen
|
|
&& memcmp (last->ai_addr, q->ai_addr, q->ai_addrlen) == 0)
|
|
{
|
|
memcpy (&results[i].source_addr, &results[i - 1].source_addr,
|
|
results[i - 1].source_addr_len);
|
|
results[i].source_addr_len = results[i - 1].source_addr_len;
|
|
results[i].got_source_addr = results[i - 1].got_source_addr;
|
|
results[i].source_addr_flags = results[i - 1].source_addr_flags;
|
|
results[i].prefixlen = results[i - 1].prefixlen;
|
|
results[i].index = results[i - 1].index;
|
|
}
|
|
else
|
|
{
|
|
results[i].got_source_addr = false;
|
|
results[i].source_addr_flags = 0;
|
|
results[i].prefixlen = 0;
|
|
results[i].index = 0xffffffffu;
|
|
|
|
/* We overwrite the type with SOCK_DGRAM since we do not
|
|
want connect() to connect to the other side. If we
|
|
cannot determine the source address remember this
|
|
fact. */
|
|
if (fd == -1 || (af == AF_INET && q->ai_family == AF_INET6))
|
|
{
|
|
if (fd != -1)
|
|
__close_nocancel_nostatus (fd);
|
|
af = q->ai_family;
|
|
fd = __socket (af, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_IP);
|
|
}
|
|
else
|
|
{
|
|
/* Reset the connection. */
|
|
struct sockaddr sa = { .sa_family = AF_UNSPEC };
|
|
__connect (fd, &sa, sizeof (sa));
|
|
}
|
|
|
|
if (try_connect (&fd, &af, &results[i].source_addr, q->ai_addr,
|
|
q->ai_addrlen, q->ai_family))
|
|
{
|
|
results[i].source_addr_len = sizeof (results[i].source_addr);
|
|
results[i].got_source_addr = true;
|
|
|
|
if (in6ai != NULL)
|
|
{
|
|
/* See whether the source address is on the list of
|
|
deprecated or temporary addresses. */
|
|
struct in6addrinfo tmp;
|
|
|
|
if (q->ai_family == AF_INET && af == AF_INET)
|
|
{
|
|
struct sockaddr_in *sinp
|
|
= (struct sockaddr_in *) &results[i].source_addr;
|
|
tmp.addr[0] = 0;
|
|
tmp.addr[1] = 0;
|
|
tmp.addr[2] = htonl (0xffff);
|
|
/* Special case for lo interface, the source address
|
|
being possibly different than the interface
|
|
address. */
|
|
if ((ntohl(sinp->sin_addr.s_addr) & 0xff000000)
|
|
== 0x7f000000)
|
|
tmp.addr[3] = htonl(0x7f000001);
|
|
else
|
|
tmp.addr[3] = sinp->sin_addr.s_addr;
|
|
}
|
|
else
|
|
{
|
|
struct sockaddr_in6 *sin6p
|
|
= (struct sockaddr_in6 *) &results[i].source_addr;
|
|
memcpy (tmp.addr, &sin6p->sin6_addr, IN6ADDRSZ);
|
|
}
|
|
|
|
struct in6addrinfo *found
|
|
= bsearch (&tmp, in6ai, in6ailen, sizeof (*in6ai),
|
|
in6aicmp);
|
|
if (found != NULL)
|
|
{
|
|
results[i].source_addr_flags = found->flags;
|
|
results[i].prefixlen = found->prefixlen;
|
|
results[i].index = found->index;
|
|
}
|
|
}
|
|
|
|
if (q->ai_family == AF_INET && af == AF_INET6)
|
|
{
|
|
/* We have to convert the address. The socket is
|
|
IPv6 and the request is for IPv4. */
|
|
struct sockaddr_in6 *sin6
|
|
= (struct sockaddr_in6 *) &results[i].source_addr;
|
|
struct sockaddr_in *sin
|
|
= (struct sockaddr_in *) &results[i].source_addr;
|
|
assert (IN6_IS_ADDR_V4MAPPED (sin6->sin6_addr.s6_addr32));
|
|
sin->sin_family = AF_INET;
|
|
/* We do not have to initialize sin_port since this
|
|
fields has the same position and size in the IPv6
|
|
structure. */
|
|
assert (offsetof (struct sockaddr_in, sin_port)
|
|
== offsetof (struct sockaddr_in6, sin6_port));
|
|
assert (sizeof (sin->sin_port)
|
|
== sizeof (sin6->sin6_port));
|
|
memcpy (&sin->sin_addr,
|
|
&sin6->sin6_addr.s6_addr32[3], INADDRSZ);
|
|
results[i].source_addr_len = sizeof (struct sockaddr_in);
|
|
}
|
|
}
|
|
else
|
|
/* Just make sure that if we have to process the same
|
|
address again we do not copy any memory. */
|
|
results[i].source_addr_len = 0;
|
|
}
|
|
|
|
/* Remember the canonical name. */
|
|
if (q->ai_canonname != NULL)
|
|
{
|
|
assert (canonname == NULL);
|
|
canonname = q->ai_canonname;
|
|
q->ai_canonname = NULL;
|
|
}
|
|
}
|
|
|
|
if (fd != -1)
|
|
__close_nocancel_nostatus (fd);
|
|
|
|
/* We got all the source addresses we can get, now sort using
|
|
the information. */
|
|
struct sort_result_combo src
|
|
= { .results = results, .nresults = nresults };
|
|
if (__glibc_unlikely (gaiconf_reload_flag_ever_set))
|
|
{
|
|
__libc_lock_define_initialized (static, lock);
|
|
|
|
__libc_lock_lock (lock);
|
|
if (__libc_once_get (old_once) && gaiconf_reload_flag)
|
|
gaiconf_reload ();
|
|
__qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src);
|
|
__libc_lock_unlock (lock);
|
|
}
|
|
else
|
|
__qsort_r (order, nresults, sizeof (order[0]), rfc3484_sort, &src);
|
|
|
|
/* Queue the results up as they come out of sorting. */
|
|
q = p = results[order[0]].dest_addr;
|
|
for (i = 1; i < nresults; ++i)
|
|
q = q->ai_next = results[order[i]].dest_addr;
|
|
q->ai_next = NULL;
|
|
|
|
/* Fill in the canonical name into the new first entry. */
|
|
p->ai_canonname = canonname;
|
|
|
|
if (malloc_results)
|
|
free (results);
|
|
}
|
|
|
|
__free_in6ai (in6ai);
|
|
|
|
if (p)
|
|
{
|
|
*pai = p;
|
|
return 0;
|
|
}
|
|
|
|
return last_i ? -last_i : EAI_NONAME;
|
|
}
|
|
libc_hidden_def (getaddrinfo)
|
|
|
|
nss_interface_function (getaddrinfo)
|
|
|
|
void
|
|
freeaddrinfo (struct addrinfo *ai)
|
|
{
|
|
struct addrinfo *p;
|
|
|
|
while (ai != NULL)
|
|
{
|
|
p = ai;
|
|
ai = ai->ai_next;
|
|
free (p->ai_canonname);
|
|
free (p);
|
|
}
|
|
}
|
|
libc_hidden_def (freeaddrinfo)
|