1219 lines
29 KiB
C
1219 lines
29 KiB
C
/* $KAME: getaddrinfo.c,v 1.14 2001/01/06 09:41:15 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, 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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* 3. Neither the name of the project 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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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Issues to be discussed:
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* - Thread safe-ness must be checked.
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* - Return values. There are nonstandard return values defined and used
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* in the source code. This is because RFC2553 is silent about which error
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* code must be returned for which situation.
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* - IPv4 classful (shortened) form. RFC2553 is silent about it. XNET 5.2
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* says to use inet_aton() to convert IPv4 numeric to binary (allows
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* classful form as a result).
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* current code - disallow classful form for IPv4 (due to use of inet_pton).
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* - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is
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* invalid.
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* current code - SEGV on freeaddrinfo(NULL)
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* Note:
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* - We use getipnodebyname() just for thread-safeness. There's no intent
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* to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to
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* getipnodebyname().
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* - The code filters out AFs that are not supported by the kernel,
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* when globbing NULL hostname (to loopback, or wildcard). Is it the right
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* thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG
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* in ai_flags?
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* - (post-2553) semantics of AI_ADDRCONFIG itself is too vague.
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* (1) what should we do against numeric hostname (2) what should we do
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* against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready?
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* non-loopback address configured? global address configured?
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* - To avoid search order issue, we have a big amount of code duplicate
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* from gethnamaddr.c and some other places. The issues that there's no
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* lower layer function to lookup "IPv4 or IPv6" record. Calling
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* gethostbyname2 from getaddrinfo will end up in wrong search order, as
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* follows:
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* - The code makes use of following calls when asked to resolver with
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* ai_family = PF_UNSPEC:
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* getipnodebyname(host, AF_INET6);
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* getipnodebyname(host, AF_INET);
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* This will result in the following queries if the node is configure to
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* prefer /etc/hosts than DNS:
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* lookup /etc/hosts for IPv6 address
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* lookup DNS for IPv6 address
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* lookup /etc/hosts for IPv4 address
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* lookup DNS for IPv4 address
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* which may not meet people's requirement.
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* The right thing to happen is to have underlying layer which does
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* PF_UNSPEC lookup (lookup both) and return chain of addrinfos.
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* This would result in a bit of code duplicate with _dns_ghbyname() and
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* friends.
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*/
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <irs.h>
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#include "port_after.h"
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#include "irs_data.h"
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/*
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* if we enable it, we will see duplicated addrinfo entries on reply if both
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* AAAA and A6 records are found. disable it for default installation.
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*/
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#undef T_A6
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#define SUCCESS 0
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#define ANY 0
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#define YES 1
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#define NO 0
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static const char in_addrany[] = { 0, 0, 0, 0 };
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static const char in6_addrany[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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static const char in_loopback[] = { 127, 0, 0, 1 };
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static const char in6_loopback[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
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};
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static const struct afd {
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int a_af;
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int a_addrlen;
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int a_socklen;
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int a_off;
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const char *a_addrany;
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const char *a_loopback;
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int a_scoped;
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} afdl [] = {
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{PF_INET6, sizeof(struct in6_addr),
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sizeof(struct sockaddr_in6),
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offsetof(struct sockaddr_in6, sin6_addr),
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in6_addrany, in6_loopback, 1},
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{PF_INET, sizeof(struct in_addr),
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sizeof(struct sockaddr_in),
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offsetof(struct sockaddr_in, sin_addr),
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in_addrany, in_loopback, 0},
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{0, 0, 0, 0, NULL, NULL, 0},
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};
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struct explore {
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int e_af;
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int e_socktype;
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int e_protocol;
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const char *e_protostr;
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int e_wild;
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#define WILD_AF(ex) ((ex)->e_wild & 0x01)
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#define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02)
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#define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04)
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};
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static const struct explore explore[] = {
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#if 0
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{ PF_LOCAL, 0, ANY, ANY, NULL, 0x01 },
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#endif
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{ PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
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{ PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
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{ PF_INET6, SOCK_RAW, ANY, NULL, 0x05 },
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{ PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
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{ PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
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{ PF_INET, SOCK_RAW, ANY, NULL, 0x05 },
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{ -1, 0, 0, NULL, 0 },
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};
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#define PTON_MAX 16
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static int str_isnumber __P((const char *));
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static int explore_fqdn __P((const struct addrinfo *, const char *,
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const char *, struct addrinfo **));
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static int explore_copy __P((const struct addrinfo *, const struct addrinfo *,
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struct addrinfo **));
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static int explore_null __P((const struct addrinfo *,
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const char *, struct addrinfo **));
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static int explore_numeric __P((const struct addrinfo *, const char *,
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const char *, struct addrinfo **));
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static int explore_numeric_scope __P((const struct addrinfo *, const char *,
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const char *, struct addrinfo **));
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static int get_canonname __P((const struct addrinfo *,
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struct addrinfo *, const char *));
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static struct addrinfo *get_ai __P((const struct addrinfo *,
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const struct afd *, const char *));
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static struct addrinfo *copy_ai __P((const struct addrinfo *));
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static int get_portmatch __P((const struct addrinfo *, const char *));
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static int get_port __P((const struct addrinfo *, const char *, int));
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static const struct afd *find_afd __P((int));
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static int addrconfig __P((int));
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static int ip6_str2scopeid __P((char *, struct sockaddr_in6 *));
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static struct net_data *init __P((void));
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struct addrinfo *hostent2addrinfo __P((struct hostent *,
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const struct addrinfo *));
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struct addrinfo *addr2addrinfo __P((const struct addrinfo *,
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const char *));
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#if 0
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static const char *ai_errlist[] = {
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"Success",
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"Address family for hostname not supported", /* EAI_ADDRFAMILY */
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"Temporary failure in name resolution", /* EAI_AGAIN */
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"Invalid value for ai_flags", /* EAI_BADFLAGS */
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"Non-recoverable failure in name resolution", /* EAI_FAIL */
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"ai_family not supported", /* EAI_FAMILY */
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"Memory allocation failure", /* EAI_MEMORY */
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"No address associated with hostname", /* EAI_NODATA */
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"hostname nor servname provided, or not known", /* EAI_NONAME */
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"servname not supported for ai_socktype", /* EAI_SERVICE */
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"ai_socktype not supported", /* EAI_SOCKTYPE */
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"System error returned in errno", /* EAI_SYSTEM */
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"Invalid value for hints", /* EAI_BADHINTS */
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"Resolved protocol is unknown", /* EAI_PROTOCOL */
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"Unknown error", /* EAI_MAX */
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};
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#endif
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/* XXX macros that make external reference is BAD. */
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#define GET_AI(ai, afd, addr) \
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do { \
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/* external reference: pai, error, and label free */ \
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(ai) = get_ai(pai, (afd), (addr)); \
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if ((ai) == NULL) { \
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error = EAI_MEMORY; \
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goto free; \
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} \
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} while (/*CONSTCOND*/0)
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#define GET_PORT(ai, serv) \
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do { \
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/* external reference: error and label free */ \
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error = get_port((ai), (serv), 0); \
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if (error != 0) \
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goto free; \
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} while (/*CONSTCOND*/0)
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#define GET_CANONNAME(ai, str) \
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do { \
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/* external reference: pai, error and label free */ \
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error = get_canonname(pai, (ai), (str)); \
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if (error != 0) \
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goto free; \
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} while (/*CONSTCOND*/0)
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#define ERR(err) \
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do { \
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/* external reference: error, and label bad */ \
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error = (err); \
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goto bad; \
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/*NOTREACHED*/ \
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} while (/*CONSTCOND*/0)
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#define MATCH_FAMILY(x, y, w) \
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((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
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#define MATCH(x, y, w) \
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((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
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#if 0 /* bind8 has its own version */
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char *
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gai_strerror(ecode)
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int ecode;
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{
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if (ecode < 0 || ecode > EAI_MAX)
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ecode = EAI_MAX;
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return ai_errlist[ecode];
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}
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#endif
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void
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freeaddrinfo(ai)
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struct addrinfo *ai;
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{
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struct addrinfo *next;
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do {
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next = ai->ai_next;
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if (ai->ai_canonname)
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free(ai->ai_canonname);
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/* no need to free(ai->ai_addr) */
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free(ai);
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ai = next;
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} while (ai);
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}
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static int
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str_isnumber(p)
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const char *p;
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{
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char *ep;
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if (*p == '\0')
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return NO;
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ep = NULL;
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(void)strtoul(p, &ep, 10);
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if (ep && *ep == '\0')
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return YES;
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else
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return NO;
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}
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int
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getaddrinfo(hostname, servname, hints, res)
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const char *hostname, *servname;
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const struct addrinfo *hints;
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struct addrinfo **res;
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{
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struct addrinfo sentinel;
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struct addrinfo *cur;
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int error = 0;
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struct addrinfo ai, ai0, *afai = NULL;
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struct addrinfo *pai;
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const struct explore *ex;
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memset(&sentinel, 0, sizeof(sentinel));
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cur = &sentinel;
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pai = &ai;
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pai->ai_flags = 0;
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pai->ai_family = PF_UNSPEC;
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pai->ai_socktype = ANY;
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pai->ai_protocol = ANY;
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pai->ai_addrlen = 0;
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pai->ai_canonname = NULL;
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pai->ai_addr = NULL;
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pai->ai_next = NULL;
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if (hostname == NULL && servname == NULL)
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return EAI_NONAME;
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if (hints) {
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/* error check for hints */
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if (hints->ai_addrlen || hints->ai_canonname ||
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hints->ai_addr || hints->ai_next)
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ERR(EAI_BADHINTS); /* xxx */
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if (hints->ai_flags & ~AI_MASK)
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ERR(EAI_BADFLAGS);
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switch (hints->ai_family) {
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case PF_UNSPEC:
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case PF_INET:
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case PF_INET6:
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break;
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default:
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ERR(EAI_FAMILY);
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}
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memcpy(pai, hints, sizeof(*pai));
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/*
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* if both socktype/protocol are specified, check if they
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* are meaningful combination.
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*/
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if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) {
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for (ex = explore; ex->e_af >= 0; ex++) {
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if (pai->ai_family != ex->e_af)
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continue;
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if (ex->e_socktype == ANY)
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continue;
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if (ex->e_protocol == ANY)
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continue;
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if (pai->ai_socktype == ex->e_socktype &&
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pai->ai_protocol != ex->e_protocol) {
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ERR(EAI_BADHINTS);
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}
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}
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}
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}
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/*
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* post-2553: AI_ALL and AI_V4MAPPED are effective only against
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* AF_INET6 query. They needs to be ignored if specified in other
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* occassions.
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*/
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switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) {
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case AI_V4MAPPED:
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case AI_ALL | AI_V4MAPPED:
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if (pai->ai_family != AF_INET6)
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pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
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break;
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case AI_ALL:
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#if 1
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/* illegal */
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ERR(EAI_BADFLAGS);
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#else
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pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED);
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break;
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#endif
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}
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/*
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* check for special cases. (1) numeric servname is disallowed if
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* socktype/protocol are left unspecified. (2) servname is disallowed
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* for raw and other inet{,6} sockets.
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*/
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if (MATCH_FAMILY(pai->ai_family, PF_INET, 1)
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#ifdef PF_INET6
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|| MATCH_FAMILY(pai->ai_family, PF_INET6, 1)
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#endif
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) {
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ai0 = *pai; /* backup *pai */
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|
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if (pai->ai_family == PF_UNSPEC) {
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#ifdef PF_INET6
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pai->ai_family = PF_INET6;
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#else
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pai->ai_family = PF_INET;
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#endif
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}
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error = get_portmatch(pai, servname);
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if (error)
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ERR(error);
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*pai = ai0;
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}
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ai0 = *pai;
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/* NULL hostname, or numeric hostname */
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for (ex = explore; ex->e_af >= 0; ex++) {
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*pai = ai0;
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if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
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continue;
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if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex)))
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continue;
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if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex)))
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continue;
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|
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if (pai->ai_family == PF_UNSPEC)
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pai->ai_family = ex->e_af;
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if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
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pai->ai_socktype = ex->e_socktype;
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if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
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pai->ai_protocol = ex->e_protocol;
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|
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/*
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* if the servname does not match socktype/protocol, ignore it.
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*/
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if (get_portmatch(pai, servname) != 0)
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continue;
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|
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if (hostname == NULL) {
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/*
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* filter out AFs that are not supported by the kernel
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* XXX errno?
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*/
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if (!addrconfig(pai->ai_family))
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continue;
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error = explore_null(pai, servname, &cur->ai_next);
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} else
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error = explore_numeric_scope(pai, hostname, servname,
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&cur->ai_next);
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if (error)
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goto free;
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while (cur && cur->ai_next)
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cur = cur->ai_next;
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}
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|
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/*
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* XXX
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* If numreic representation of AF1 can be interpreted as FQDN
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* representation of AF2, we need to think again about the code below.
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*/
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if (sentinel.ai_next)
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goto good;
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if (pai->ai_flags & AI_NUMERICHOST)
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ERR(EAI_NONAME);
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if (hostname == NULL)
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ERR(EAI_NONAME);
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/*
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* hostname as alphabetical name.
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* We'll make sure that
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* - if returning addrinfo list is empty, return non-zero error
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* value (already known one or EAI_NONAME).
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* - otherwise,
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* + if we haven't had any errors, return 0 (i.e. success).
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* + if we've had an error, free the list and return the error.
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* without any assumption on the behavior of explore_fqdn().
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*/
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/* first, try to query DNS for all possible address families. */
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*pai = ai0;
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error = explore_fqdn(pai, hostname, servname, &afai);
|
|
if (error) {
|
|
if (afai != NULL)
|
|
freeaddrinfo(afai);
|
|
goto free;
|
|
}
|
|
if (afai == NULL) {
|
|
error = EAI_NONAME; /* we've had no errors. */
|
|
goto free;
|
|
}
|
|
|
|
/*
|
|
* we would like to prefer AF_INET6 than AF_INET, so we'll make an
|
|
* outer loop by AFs.
|
|
*/
|
|
for (ex = explore; ex->e_af >= 0; ex++) {
|
|
*pai = ai0;
|
|
|
|
if (pai->ai_family == PF_UNSPEC)
|
|
pai->ai_family = ex->e_af;
|
|
|
|
if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
|
|
continue;
|
|
if (!MATCH(pai->ai_socktype, ex->e_socktype,
|
|
WILD_SOCKTYPE(ex))) {
|
|
continue;
|
|
}
|
|
if (!MATCH(pai->ai_protocol, ex->e_protocol,
|
|
WILD_PROTOCOL(ex))) {
|
|
continue;
|
|
}
|
|
|
|
#ifdef AI_ADDRCONFIG
|
|
/*
|
|
* If AI_ADDRCONFIG is specified, check if we are
|
|
* expected to return the address family or not.
|
|
*/
|
|
if ((pai->ai_flags & AI_ADDRCONFIG) != 0 &&
|
|
!addrconfig(pai->ai_family))
|
|
continue;
|
|
#endif
|
|
|
|
if (pai->ai_family == PF_UNSPEC)
|
|
pai->ai_family = ex->e_af;
|
|
if (pai->ai_socktype == ANY && ex->e_socktype != ANY)
|
|
pai->ai_socktype = ex->e_socktype;
|
|
if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
|
|
pai->ai_protocol = ex->e_protocol;
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
continue;
|
|
|
|
if ((error = explore_copy(pai, afai, &cur->ai_next)) != 0) {
|
|
freeaddrinfo(afai);
|
|
goto free;
|
|
}
|
|
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
|
|
freeaddrinfo(afai); /* afai must not be NULL at this point. */
|
|
|
|
/* we must not have got any errors. */
|
|
if (error != 0) /* just for diagnosis */
|
|
abort();
|
|
|
|
if (sentinel.ai_next) {
|
|
good:
|
|
*res = sentinel.ai_next;
|
|
return(SUCCESS);
|
|
} else {
|
|
/*
|
|
* All the process succeeded, but we've had an empty list.
|
|
* This can happen if the given hints do not match our
|
|
* candidates.
|
|
*/
|
|
error = EAI_NONAME;
|
|
}
|
|
|
|
free:
|
|
bad:
|
|
if (sentinel.ai_next)
|
|
freeaddrinfo(sentinel.ai_next);
|
|
*res = NULL;
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* FQDN hostname, DNS lookup
|
|
*/
|
|
static int
|
|
explore_fqdn(pai, hostname, servname, res)
|
|
const struct addrinfo *pai;
|
|
const char *hostname;
|
|
const char *servname;
|
|
struct addrinfo **res;
|
|
{
|
|
struct addrinfo *result;
|
|
struct addrinfo *cur;
|
|
struct net_data *net_data = init();
|
|
struct irs_ho *ho;
|
|
int error = 0;
|
|
char tmp[NS_MAXDNAME];
|
|
const char *cp;
|
|
|
|
result = NULL;
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
return(0);
|
|
|
|
if (!net_data || !(ho = net_data->ho))
|
|
return(0);
|
|
#if 0 /* XXX (notyet) */
|
|
if (net_data->ho_stayopen && net_data->ho_last &&
|
|
net_data->ho_last->h_addrtype == af) {
|
|
if (ns_samename(name, net_data->ho_last->h_name) == 1)
|
|
return (net_data->ho_last);
|
|
for (hap = net_data->ho_last->h_aliases; hap && *hap; hap++)
|
|
if (ns_samename(name, *hap) == 1)
|
|
return (net_data->ho_last);
|
|
}
|
|
#endif
|
|
if (!strchr(hostname, '.') &&
|
|
(cp = res_hostalias(net_data->res, hostname,
|
|
tmp, sizeof(tmp))))
|
|
hostname = cp;
|
|
result = (*ho->addrinfo)(ho, hostname, pai);
|
|
if (!net_data->ho_stayopen) {
|
|
(*ho->minimize)(ho);
|
|
}
|
|
if (result == NULL) {
|
|
int e = h_errno;
|
|
|
|
switch(e) {
|
|
case NETDB_INTERNAL:
|
|
error = EAI_SYSTEM;
|
|
break;
|
|
case TRY_AGAIN:
|
|
error = EAI_AGAIN;
|
|
break;
|
|
case NO_RECOVERY:
|
|
error = EAI_FAIL;
|
|
break;
|
|
case HOST_NOT_FOUND:
|
|
case NO_DATA:
|
|
error = EAI_NONAME;
|
|
break;
|
|
default:
|
|
case NETDB_SUCCESS: /* should be impossible... */
|
|
error = EAI_NONAME;
|
|
break;
|
|
}
|
|
goto free;
|
|
}
|
|
|
|
for (cur = result; cur; cur = cur->ai_next) {
|
|
GET_PORT(cur, servname); /* XXX: redundant lookups... */
|
|
/* canonname should already be filled. */
|
|
}
|
|
|
|
*res = result;
|
|
|
|
return(0);
|
|
|
|
free:
|
|
if (result)
|
|
freeaddrinfo(result);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
explore_copy(pai, src0, res)
|
|
const struct addrinfo *pai; /* seed */
|
|
const struct addrinfo *src0; /* source */
|
|
struct addrinfo **res;
|
|
{
|
|
int error;
|
|
struct addrinfo sentinel, *cur;
|
|
const struct addrinfo *src;
|
|
|
|
error = 0;
|
|
sentinel.ai_next = NULL;
|
|
cur = &sentinel;
|
|
|
|
for (src = src0; src != NULL; src = src->ai_next) {
|
|
if (src->ai_family != pai->ai_family)
|
|
continue;
|
|
|
|
cur->ai_next = copy_ai(src);
|
|
if (!cur->ai_next) {
|
|
error = EAI_MEMORY;
|
|
goto fail;
|
|
}
|
|
|
|
cur->ai_next->ai_socktype = pai->ai_socktype;
|
|
cur->ai_next->ai_protocol = pai->ai_protocol;
|
|
cur = cur->ai_next;
|
|
}
|
|
|
|
*res = sentinel.ai_next;
|
|
return 0;
|
|
|
|
fail:
|
|
freeaddrinfo(sentinel.ai_next);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* hostname == NULL.
|
|
* passive socket -> anyaddr (0.0.0.0 or ::)
|
|
* non-passive socket -> localhost (127.0.0.1 or ::1)
|
|
*/
|
|
static int
|
|
explore_null(pai, servname, res)
|
|
const struct addrinfo *pai;
|
|
const char *servname;
|
|
struct addrinfo **res;
|
|
{
|
|
const struct afd *afd;
|
|
struct addrinfo *cur;
|
|
struct addrinfo sentinel;
|
|
int error;
|
|
|
|
*res = NULL;
|
|
sentinel.ai_next = NULL;
|
|
cur = &sentinel;
|
|
|
|
afd = find_afd(pai->ai_family);
|
|
if (afd == NULL)
|
|
return 0;
|
|
|
|
if (pai->ai_flags & AI_PASSIVE) {
|
|
GET_AI(cur->ai_next, afd, afd->a_addrany);
|
|
/* xxx meaningless?
|
|
* GET_CANONNAME(cur->ai_next, "anyaddr");
|
|
*/
|
|
GET_PORT(cur->ai_next, servname);
|
|
} else {
|
|
GET_AI(cur->ai_next, afd, afd->a_loopback);
|
|
/* xxx meaningless?
|
|
* GET_CANONNAME(cur->ai_next, "localhost");
|
|
*/
|
|
GET_PORT(cur->ai_next, servname);
|
|
}
|
|
cur = cur->ai_next;
|
|
|
|
*res = sentinel.ai_next;
|
|
return 0;
|
|
|
|
free:
|
|
if (sentinel.ai_next)
|
|
freeaddrinfo(sentinel.ai_next);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* numeric hostname
|
|
*/
|
|
static int
|
|
explore_numeric(pai, hostname, servname, res)
|
|
const struct addrinfo *pai;
|
|
const char *hostname;
|
|
const char *servname;
|
|
struct addrinfo **res;
|
|
{
|
|
const struct afd *afd;
|
|
struct addrinfo *cur;
|
|
struct addrinfo sentinel;
|
|
int error;
|
|
char pton[PTON_MAX];
|
|
|
|
*res = NULL;
|
|
sentinel.ai_next = NULL;
|
|
cur = &sentinel;
|
|
|
|
afd = find_afd(pai->ai_family);
|
|
if (afd == NULL)
|
|
return 0;
|
|
|
|
switch (afd->a_af) {
|
|
#if 0 /*X/Open spec*/
|
|
case AF_INET:
|
|
if (inet_aton(hostname, (struct in_addr *)pton) == 1) {
|
|
if (pai->ai_family == afd->a_af ||
|
|
pai->ai_family == PF_UNSPEC /*?*/) {
|
|
GET_AI(cur->ai_next, afd, pton);
|
|
GET_PORT(cur->ai_next, servname);
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
} else
|
|
ERR(EAI_FAMILY); /*xxx*/
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
if (inet_pton(afd->a_af, hostname, pton) == 1) {
|
|
if (pai->ai_family == afd->a_af ||
|
|
pai->ai_family == PF_UNSPEC /*?*/) {
|
|
GET_AI(cur->ai_next, afd, pton);
|
|
GET_PORT(cur->ai_next, servname);
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
} else
|
|
ERR(EAI_FAMILY); /*xxx*/
|
|
}
|
|
break;
|
|
}
|
|
|
|
*res = sentinel.ai_next;
|
|
return 0;
|
|
|
|
free:
|
|
bad:
|
|
if (sentinel.ai_next)
|
|
freeaddrinfo(sentinel.ai_next);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* numeric hostname with scope
|
|
*/
|
|
static int
|
|
explore_numeric_scope(pai, hostname, servname, res)
|
|
const struct addrinfo *pai;
|
|
const char *hostname;
|
|
const char *servname;
|
|
struct addrinfo **res;
|
|
{
|
|
#ifndef SCOPE_DELIMITER
|
|
return explore_numeric(pai, hostname, servname, res);
|
|
#else
|
|
const struct afd *afd;
|
|
struct addrinfo *cur;
|
|
int error;
|
|
char *cp, *hostname2 = NULL, *scope, *addr;
|
|
struct sockaddr_in6 *sin6;
|
|
|
|
afd = find_afd(pai->ai_family);
|
|
if (afd == NULL)
|
|
return 0;
|
|
|
|
if (!afd->a_scoped)
|
|
return explore_numeric(pai, hostname, servname, res);
|
|
|
|
cp = strchr(hostname, SCOPE_DELIMITER);
|
|
if (cp == NULL)
|
|
return explore_numeric(pai, hostname, servname, res);
|
|
|
|
/*
|
|
* Handle special case of <scoped_address><delimiter><scope id>
|
|
*/
|
|
hostname2 = strdup(hostname);
|
|
if (hostname2 == NULL)
|
|
return EAI_MEMORY;
|
|
/* terminate at the delimiter */
|
|
hostname2[cp - hostname] = '\0';
|
|
addr = hostname2;
|
|
scope = cp + 1;
|
|
|
|
error = explore_numeric(pai, addr, servname, res);
|
|
if (error == 0) {
|
|
int scopeid;
|
|
|
|
for (cur = *res; cur; cur = cur->ai_next) {
|
|
if (cur->ai_family != AF_INET6)
|
|
continue;
|
|
sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
|
|
if ((scopeid = ip6_str2scopeid(scope, sin6)) == -1) {
|
|
free(hostname2);
|
|
return(EAI_NONAME); /* XXX: is return OK? */
|
|
}
|
|
#ifdef HAVE_SIN6_SCOPE_ID
|
|
sin6->sin6_scope_id = scopeid;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
free(hostname2);
|
|
|
|
return error;
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
get_canonname(pai, ai, str)
|
|
const struct addrinfo *pai;
|
|
struct addrinfo *ai;
|
|
const char *str;
|
|
{
|
|
if ((pai->ai_flags & AI_CANONNAME) != 0) {
|
|
ai->ai_canonname = (char *)malloc(strlen(str) + 1);
|
|
if (ai->ai_canonname == NULL)
|
|
return EAI_MEMORY;
|
|
strcpy(ai->ai_canonname, str);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct addrinfo *
|
|
get_ai(pai, afd, addr)
|
|
const struct addrinfo *pai;
|
|
const struct afd *afd;
|
|
const char *addr;
|
|
{
|
|
char *p;
|
|
struct addrinfo *ai;
|
|
|
|
ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
|
|
+ (afd->a_socklen));
|
|
if (ai == NULL)
|
|
return NULL;
|
|
|
|
memcpy(ai, pai, sizeof(struct addrinfo));
|
|
ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
|
|
memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
|
|
#ifdef HAVE_SA_LEN
|
|
ai->ai_addr->sa_len = afd->a_socklen;
|
|
#endif
|
|
ai->ai_addrlen = afd->a_socklen;
|
|
ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
|
|
p = (char *)(void *)(ai->ai_addr);
|
|
memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
|
|
return ai;
|
|
}
|
|
|
|
/* XXX need to malloc() the same way we do from other functions! */
|
|
static struct addrinfo *
|
|
copy_ai(pai)
|
|
const struct addrinfo *pai;
|
|
{
|
|
struct addrinfo *ai;
|
|
size_t l;
|
|
|
|
l = sizeof(*ai) + pai->ai_addrlen;
|
|
if ((ai = (struct addrinfo *)malloc(l)) == NULL)
|
|
return NULL;
|
|
memset(ai, 0, l);
|
|
memcpy(ai, pai, sizeof(*ai));
|
|
ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
|
|
memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
|
|
|
|
if (pai->ai_canonname) {
|
|
l = strlen(pai->ai_canonname) + 1;
|
|
if ((ai->ai_canonname = malloc(l)) == NULL) {
|
|
free(ai);
|
|
return NULL;
|
|
}
|
|
#ifdef HAVE_STRLCPY
|
|
strlcpy(ai->ai_canonname, pai->ai_canonname, l);
|
|
#else
|
|
strncpy(ai->ai_canonname, pai->ai_canonname, l);
|
|
#endif
|
|
} else {
|
|
/* just to make sure */
|
|
ai->ai_canonname = NULL;
|
|
}
|
|
|
|
ai->ai_next = NULL;
|
|
|
|
return ai;
|
|
}
|
|
|
|
static int
|
|
get_portmatch(const struct addrinfo *ai, const char *servname) {
|
|
|
|
/* get_port does not touch first argument. when matchonly == 1. */
|
|
/* LINTED const cast */
|
|
return get_port((const struct addrinfo *)ai, servname, 1);
|
|
}
|
|
|
|
static int
|
|
get_port(const struct addrinfo *ai, const char *servname, int matchonly) {
|
|
const char *proto;
|
|
struct servent *sp;
|
|
int port;
|
|
int allownumeric;
|
|
|
|
if (servname == NULL)
|
|
return 0;
|
|
switch (ai->ai_family) {
|
|
case AF_INET:
|
|
#ifdef AF_INET6
|
|
case AF_INET6:
|
|
#endif
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
switch (ai->ai_socktype) {
|
|
case SOCK_RAW:
|
|
return EAI_SERVICE;
|
|
case SOCK_DGRAM:
|
|
case SOCK_STREAM:
|
|
allownumeric = 1;
|
|
break;
|
|
case ANY:
|
|
allownumeric = 0;
|
|
break;
|
|
default:
|
|
return EAI_SOCKTYPE;
|
|
}
|
|
|
|
if (str_isnumber(servname)) {
|
|
if (!allownumeric)
|
|
return EAI_SERVICE;
|
|
port = htons(atoi(servname));
|
|
if (port < 0 || port > 65535)
|
|
return EAI_SERVICE;
|
|
} else {
|
|
switch (ai->ai_socktype) {
|
|
case SOCK_DGRAM:
|
|
proto = "udp";
|
|
break;
|
|
case SOCK_STREAM:
|
|
proto = "tcp";
|
|
break;
|
|
default:
|
|
proto = NULL;
|
|
break;
|
|
}
|
|
|
|
if ((sp = getservbyname(servname, proto)) == NULL)
|
|
return EAI_SERVICE;
|
|
port = sp->s_port;
|
|
}
|
|
|
|
if (!matchonly) {
|
|
switch (ai->ai_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)(void *)
|
|
ai->ai_addr)->sin_port = port;
|
|
break;
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)(void *)
|
|
ai->ai_addr)->sin6_port = port;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct afd *
|
|
find_afd(af)
|
|
int af;
|
|
{
|
|
const struct afd *afd;
|
|
|
|
if (af == PF_UNSPEC)
|
|
return NULL;
|
|
for (afd = afdl; afd->a_af; afd++) {
|
|
if (afd->a_af == af)
|
|
return afd;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend
|
|
* will take care of it.
|
|
* the semantics of AI_ADDRCONFIG is not defined well. we are not sure
|
|
* if the code is right or not.
|
|
*/
|
|
static int
|
|
addrconfig(af)
|
|
int af;
|
|
{
|
|
int s;
|
|
|
|
/* XXX errno */
|
|
s = socket(af, SOCK_DGRAM, 0);
|
|
if (s < 0) {
|
|
if (errno != EMFILE)
|
|
return 0;
|
|
} else
|
|
close(s);
|
|
return 1;
|
|
}
|
|
|
|
/* convert a string to a scope identifier. XXX: IPv6 specific */
|
|
static int
|
|
ip6_str2scopeid(scope, sin6)
|
|
char *scope;
|
|
struct sockaddr_in6 *sin6;
|
|
{
|
|
int scopeid;
|
|
struct in6_addr *a6 = &sin6->sin6_addr;
|
|
char *ep;
|
|
|
|
/* empty scopeid portion is invalid */
|
|
if (*scope == '\0')
|
|
return -1;
|
|
|
|
#ifdef USE_IFNAMELINKID
|
|
if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {
|
|
/*
|
|
* Using interface names as link indices can be allowed
|
|
* only when we can assume a one-to-one mappings between
|
|
* links and interfaces. See comments in getnameinfo.c.
|
|
*/
|
|
scopeid = if_nametoindex(scope);
|
|
if (scopeid == 0)
|
|
goto trynumeric;
|
|
return(scopeid);
|
|
}
|
|
#endif
|
|
|
|
/* still unclear about literal, allow numeric only - placeholder */
|
|
if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
|
|
goto trynumeric;
|
|
if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
|
|
goto trynumeric;
|
|
else
|
|
goto trynumeric; /* global */
|
|
|
|
/* try to convert to a numeric id as a last resort */
|
|
trynumeric:
|
|
scopeid = (int)strtoul(scope, &ep, 10);
|
|
if (*ep == '\0')
|
|
return scopeid;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
struct addrinfo *
|
|
hostent2addrinfo(hp, pai)
|
|
struct hostent *hp;
|
|
const struct addrinfo *pai;
|
|
{
|
|
int i, af, error = 0;
|
|
char **aplist = NULL, *ap;
|
|
struct addrinfo sentinel, *cur;
|
|
const struct afd *afd;
|
|
|
|
af = hp->h_addrtype;
|
|
if (pai->ai_family != AF_UNSPEC && af != pai->ai_family)
|
|
return(NULL);
|
|
|
|
afd = find_afd(af);
|
|
if (afd == NULL)
|
|
return(NULL);
|
|
|
|
aplist = hp->h_addr_list;
|
|
|
|
memset(&sentinel, 0, sizeof(sentinel));
|
|
cur = &sentinel;
|
|
|
|
for (i = 0; (ap = aplist[i]) != NULL; i++) {
|
|
#if 0 /* the trick seems too much */
|
|
af = hp->h_addr_list;
|
|
if (af == AF_INET6 &&
|
|
IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) {
|
|
af = AF_INET;
|
|
ap = ap + sizeof(struct in6_addr)
|
|
- sizeof(struct in_addr);
|
|
}
|
|
afd = find_afd(af);
|
|
if (afd == NULL)
|
|
continue;
|
|
#endif /* 0 */
|
|
|
|
GET_AI(cur->ai_next, afd, ap);
|
|
|
|
/* GET_PORT(cur->ai_next, servname); */
|
|
if ((pai->ai_flags & AI_CANONNAME) != 0) {
|
|
/*
|
|
* RFC2553 says that ai_canonname will be set only for
|
|
* the first element. we do it for all the elements,
|
|
* just for convenience.
|
|
*/
|
|
GET_CANONNAME(cur->ai_next, hp->h_name);
|
|
}
|
|
while (cur && cur->ai_next) /* no need to loop, actually. */
|
|
cur = cur->ai_next;
|
|
continue;
|
|
|
|
free:
|
|
if (cur->ai_next)
|
|
freeaddrinfo(cur->ai_next);
|
|
cur->ai_next = NULL;
|
|
/* continue, without tht pointer CUR advanced. */
|
|
}
|
|
|
|
return(sentinel.ai_next);
|
|
}
|
|
|
|
struct addrinfo *
|
|
addr2addrinfo(pai, cp)
|
|
const struct addrinfo *pai;
|
|
const char *cp;
|
|
{
|
|
const struct afd *afd;
|
|
|
|
afd = find_afd(pai->ai_family);
|
|
if (afd == NULL)
|
|
return(NULL);
|
|
|
|
return(get_ai(pai, afd, cp));
|
|
}
|
|
|
|
static struct net_data *
|
|
init()
|
|
{
|
|
struct net_data *net_data;
|
|
|
|
if (!(net_data = net_data_init(NULL)))
|
|
goto error;
|
|
if (!net_data->ho) {
|
|
net_data->ho = (*net_data->irs->ho_map)(net_data->irs);
|
|
if (!net_data->ho || !net_data->res) {
|
|
error:
|
|
errno = EIO;
|
|
if (net_data && net_data->res)
|
|
RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL);
|
|
return (NULL);
|
|
}
|
|
|
|
(*net_data->ho->res_set)(net_data->ho, net_data->res, NULL);
|
|
}
|
|
|
|
return (net_data);
|
|
}
|