1977 lines
45 KiB
C
1977 lines
45 KiB
C
/* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun 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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* "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator.
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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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* - 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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/*
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* diffs with other KAME platforms:
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* - other KAME platforms already nuked FAITH ($GAI), but as FreeBSD
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* 4.0-RELEASE supplies it, we still have the code here.
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* - AI_ADDRCONFIG support is supplied
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* - some of FreeBSD style (#define tabify and others)
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* - classful IPv4 numeric (127.1) is allowed.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.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 <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.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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#ifdef DEBUG
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#include <syslog.h>
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#endif
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#include <stdarg.h>
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#include <nsswitch.h>
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#include "un-namespace.h"
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#if defined(__KAME__) && defined(INET6)
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# define FAITH
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#endif
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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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#ifdef INET6
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#define N_INET6 0
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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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#define N_INET 1
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#else
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#define N_INET 0
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#endif
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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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#ifdef INET6
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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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#endif
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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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{ PF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 },
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{ PF_UNSPEC, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 },
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{ PF_UNSPEC, SOCK_RAW, ANY, NULL, 0x05 },
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{ -1, 0, 0, NULL, 0 },
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};
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#ifdef INET6
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#define PTON_MAX 16
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#else
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#define PTON_MAX 4
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#endif
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static const ns_src default_dns_files[] = {
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{ NSSRC_FILES, NS_SUCCESS },
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{ NSSRC_DNS, NS_SUCCESS },
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{ 0 }
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};
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#if PACKETSZ > 1024
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#define MAXPACKET PACKETSZ
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#else
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#define MAXPACKET 1024
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#endif
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typedef union {
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HEADER hdr;
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u_char buf[MAXPACKET];
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} querybuf;
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struct res_target {
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struct res_target *next;
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const char *name; /* domain name */
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int qclass, qtype; /* class and type of query */
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u_char *answer; /* buffer to put answer */
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int anslen; /* size of answer buffer */
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int n; /* result length */
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};
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static int str_isnumber(const char *);
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static int explore_fqdn(const struct addrinfo *, const char *,
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const char *, struct addrinfo **);
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static int explore_null(const struct addrinfo *,
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const char *, struct addrinfo **);
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static int explore_numeric(const struct addrinfo *, const char *,
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const char *, struct addrinfo **);
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static int explore_numeric_scope(const struct addrinfo *, const char *,
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const char *, struct addrinfo **);
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static int get_canonname(const struct addrinfo *,
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struct addrinfo *, const char *);
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static struct addrinfo *get_ai(const struct addrinfo *,
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const struct afd *, const char *);
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static int get_portmatch(const struct addrinfo *, const char *);
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static int get_port(struct addrinfo *, const char *, int);
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static const struct afd *find_afd(int);
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static int addrconfig(struct addrinfo *);
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#ifdef INET6
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static int ip6_str2scopeid(char *, struct sockaddr_in6 *);
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#endif
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static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
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const struct addrinfo *);
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static int _dns_getaddrinfo(void *, void *, va_list);
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static void _sethtent(void);
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static void _endhtent(void);
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static struct addrinfo *_gethtent(const char *, const struct addrinfo *);
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static int _files_getaddrinfo(void *, void *, va_list);
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#ifdef YP
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static struct addrinfo *_yphostent(char *, const struct addrinfo *);
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static int _yp_getaddrinfo(void *, void *, va_list);
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extern int _yp_check(char **);
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#endif
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static int res_queryN(const char *, struct res_target *);
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static int res_searchN(const char *, struct res_target *);
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static int res_querydomainN(const char *, const char *,
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struct res_target *);
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static 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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/* 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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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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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;
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struct addrinfo ai0;
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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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#ifdef INET6
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case PF_INET6:
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#endif
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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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#endif
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break;
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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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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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/* PF_UNSPEC entries are prepared for DNS queries only */
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if (ex->e_af == PF_UNSPEC)
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continue;
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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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|
|
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 (hostname == NULL)
|
|
error = explore_null(pai, servname, &cur->ai_next);
|
|
else
|
|
error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next);
|
|
|
|
if (error)
|
|
goto free;
|
|
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
|
|
/*
|
|
* XXX
|
|
* If numreic representation of AF1 can be interpreted as FQDN
|
|
* representation of AF2, we need to think again about the code below.
|
|
*/
|
|
if (sentinel.ai_next)
|
|
goto good;
|
|
|
|
if (pai->ai_flags & AI_NUMERICHOST)
|
|
ERR(EAI_NONAME);
|
|
if (hostname == NULL)
|
|
ERR(EAI_NODATA);
|
|
|
|
if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && !addrconfig(&ai0))
|
|
ERR(EAI_FAIL);
|
|
|
|
/*
|
|
* hostname as alphabetical name.
|
|
* we would like to prefer AF_INET6 than AF_INET, so we'll make a
|
|
* outer loop by AFs.
|
|
*/
|
|
for (ex = explore; ex->e_af >= 0; ex++) {
|
|
*pai = ai0;
|
|
|
|
/* require exact match for family field */
|
|
if (pai->ai_family != ex->e_af)
|
|
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;
|
|
}
|
|
|
|
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;
|
|
|
|
error = explore_fqdn(pai, hostname, servname,
|
|
&cur->ai_next);
|
|
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
|
|
/* XXX */
|
|
if (sentinel.ai_next)
|
|
error = 0;
|
|
|
|
if (error)
|
|
goto free;
|
|
if (error == 0) {
|
|
if (sentinel.ai_next) {
|
|
good:
|
|
*res = sentinel.ai_next;
|
|
return SUCCESS;
|
|
} else
|
|
error = EAI_FAIL;
|
|
}
|
|
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;
|
|
int error = 0;
|
|
static const ns_dtab dtab[] = {
|
|
NS_FILES_CB(_files_getaddrinfo, NULL)
|
|
{ NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
|
|
NS_NIS_CB(_yp_getaddrinfo, NULL)
|
|
{ 0 }
|
|
};
|
|
|
|
result = NULL;
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
return 0;
|
|
|
|
switch (nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
|
|
default_dns_files, hostname, pai)) {
|
|
case NS_TRYAGAIN:
|
|
error = EAI_AGAIN;
|
|
goto free;
|
|
case NS_UNAVAIL:
|
|
error = EAI_FAIL;
|
|
goto free;
|
|
case NS_NOTFOUND:
|
|
error = EAI_NODATA;
|
|
goto free;
|
|
case NS_SUCCESS:
|
|
error = 0;
|
|
for (cur = result; cur; cur = cur->ai_next) {
|
|
GET_PORT(cur, servname);
|
|
/* canonname should be filled already */
|
|
}
|
|
break;
|
|
}
|
|
|
|
*res = result;
|
|
|
|
return 0;
|
|
|
|
free:
|
|
if (result)
|
|
freeaddrinfo(result);
|
|
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;
|
|
{
|
|
int s;
|
|
const struct afd *afd;
|
|
struct addrinfo *cur;
|
|
struct addrinfo sentinel;
|
|
int error;
|
|
|
|
*res = NULL;
|
|
sentinel.ai_next = NULL;
|
|
cur = &sentinel;
|
|
|
|
/*
|
|
* filter out AFs that are not supported by the kernel
|
|
* XXX errno?
|
|
*/
|
|
s = _socket(pai->ai_family, SOCK_DGRAM, 0);
|
|
if (s < 0) {
|
|
if (errno != EMFILE)
|
|
return 0;
|
|
} else
|
|
_close(s);
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
return 0;
|
|
|
|
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;
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
return 0;
|
|
|
|
afd = find_afd(pai->ai_family);
|
|
if (afd == NULL)
|
|
return 0;
|
|
|
|
switch (afd->a_af) {
|
|
#if 1 /*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;
|
|
{
|
|
#if !defined(SCOPE_DELIMITER) || !defined(INET6)
|
|
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;
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
return 0;
|
|
|
|
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_NODATA); /* XXX: is return OK? */
|
|
}
|
|
sin6->sin6_scope_id = scopeid;
|
|
}
|
|
}
|
|
|
|
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;
|
|
#ifdef FAITH
|
|
struct in6_addr faith_prefix;
|
|
char *fp_str;
|
|
int translate = 0;
|
|
#endif
|
|
|
|
#ifdef FAITH
|
|
/*
|
|
* Transfrom an IPv4 addr into a special IPv6 addr format for
|
|
* IPv6->IPv4 translation gateway. (only TCP is supported now)
|
|
*
|
|
* +-----------------------------------+------------+
|
|
* | faith prefix part (12 bytes) | embedded |
|
|
* | | IPv4 addr part (4 bytes)
|
|
* +-----------------------------------+------------+
|
|
*
|
|
* faith prefix part is specified as ascii IPv6 addr format
|
|
* in environmental variable GAI.
|
|
* For FAITH to work correctly, routing to faith prefix must be
|
|
* setup toward a machine where a FAITH daemon operates.
|
|
* Also, the machine must enable some mechanizm
|
|
* (e.g. faith interface hack) to divert those packet with
|
|
* faith prefixed destination addr to user-land FAITH daemon.
|
|
*/
|
|
fp_str = getenv("GAI");
|
|
if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 &&
|
|
afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) {
|
|
u_int32_t v4a;
|
|
u_int8_t v4a_top;
|
|
|
|
memcpy(&v4a, addr, sizeof v4a);
|
|
v4a_top = v4a >> IN_CLASSA_NSHIFT;
|
|
if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) &&
|
|
v4a_top != 0 && v4a != IN_LOOPBACKNET) {
|
|
afd = &afdl[N_INET6];
|
|
memcpy(&faith_prefix.s6_addr[12], addr,
|
|
sizeof(struct in_addr));
|
|
translate = 1;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
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);
|
|
ai->ai_addr->sa_len = afd->a_socklen;
|
|
ai->ai_addrlen = afd->a_socklen;
|
|
ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
|
|
p = (char *)(void *)(ai->ai_addr);
|
|
#ifdef FAITH
|
|
if (translate == 1)
|
|
memcpy(p + afd->a_off, &faith_prefix, (size_t)afd->a_addrlen);
|
|
else
|
|
#endif
|
|
memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
|
|
return ai;
|
|
}
|
|
|
|
static int
|
|
get_portmatch(ai, servname)
|
|
const struct addrinfo *ai;
|
|
const char *servname;
|
|
{
|
|
|
|
/* get_port does not touch first argument. when matchonly == 1. */
|
|
/* LINTED const cast */
|
|
return get_port((struct addrinfo *)ai, servname, 1);
|
|
}
|
|
|
|
static int
|
|
get_port(ai, servname, matchonly)
|
|
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;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)(void *)
|
|
ai->ai_addr)->sin6_port = port;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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.
|
|
*
|
|
* XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
|
|
* _dns_getaddrinfo.
|
|
*/
|
|
static int
|
|
addrconfig(pai)
|
|
struct addrinfo *pai;
|
|
{
|
|
int s, af;
|
|
|
|
/*
|
|
* TODO:
|
|
* Note that implementation dependent test for address
|
|
* configuration should be done everytime called
|
|
* (or apropriate interval),
|
|
* because addresses will be dynamically assigned or deleted.
|
|
*/
|
|
af = pai->ai_family;
|
|
if (af == AF_UNSPEC) {
|
|
if ((s = _socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
|
|
af = AF_INET;
|
|
else {
|
|
_close(s);
|
|
if ((s = _socket(AF_INET, SOCK_DGRAM, 0)) < 0)
|
|
af = AF_INET6;
|
|
else
|
|
_close(s);
|
|
}
|
|
}
|
|
if (af != AF_UNSPEC) {
|
|
if ((s = _socket(af, SOCK_DGRAM, 0)) < 0)
|
|
return 0;
|
|
_close(s);
|
|
}
|
|
pai->ai_family = af;
|
|
return 1;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* 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;
|
|
|
|
if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) {
|
|
/*
|
|
* We currently assume a one-to-one mapping between links
|
|
* and interfaces, so we simply use interface indices for
|
|
* like-local scopes.
|
|
*/
|
|
scopeid = if_nametoindex(scope);
|
|
if (scopeid == 0)
|
|
goto trynumeric;
|
|
return(scopeid);
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
static const char AskedForGot[] =
|
|
"gethostby*.getanswer: asked for \"%s\", got \"%s\"";
|
|
#endif
|
|
static FILE *hostf = NULL;
|
|
|
|
static struct addrinfo *
|
|
getanswer(answer, anslen, qname, qtype, pai)
|
|
const querybuf *answer;
|
|
int anslen;
|
|
const char *qname;
|
|
int qtype;
|
|
const struct addrinfo *pai;
|
|
{
|
|
struct addrinfo sentinel, *cur;
|
|
struct addrinfo ai;
|
|
const struct afd *afd;
|
|
char *canonname;
|
|
const HEADER *hp;
|
|
const u_char *cp;
|
|
int n;
|
|
const u_char *eom;
|
|
char *bp;
|
|
int type, class, buflen, ancount, qdcount;
|
|
int haveanswer, had_error;
|
|
char tbuf[MAXDNAME];
|
|
int (*name_ok)(const char *);
|
|
char hostbuf[8*1024];
|
|
|
|
memset(&sentinel, 0, sizeof(sentinel));
|
|
cur = &sentinel;
|
|
|
|
canonname = NULL;
|
|
eom = answer->buf + anslen;
|
|
switch (qtype) {
|
|
case T_A:
|
|
case T_AAAA:
|
|
case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
|
|
name_ok = res_hnok;
|
|
break;
|
|
default:
|
|
return (NULL); /* XXX should be abort(); */
|
|
}
|
|
/*
|
|
* find first satisfactory answer
|
|
*/
|
|
hp = &answer->hdr;
|
|
ancount = ntohs(hp->ancount);
|
|
qdcount = ntohs(hp->qdcount);
|
|
bp = hostbuf;
|
|
buflen = sizeof hostbuf;
|
|
cp = answer->buf + HFIXEDSZ;
|
|
if (qdcount != 1) {
|
|
h_errno = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
|
if ((n < 0) || !(*name_ok)(bp)) {
|
|
h_errno = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
cp += n + QFIXEDSZ;
|
|
if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
|
|
/* res_send() has already verified that the query name is the
|
|
* same as the one we sent; this just gets the expanded name
|
|
* (i.e., with the succeeding search-domain tacked on).
|
|
*/
|
|
n = strlen(bp) + 1; /* for the \0 */
|
|
if (n >= MAXHOSTNAMELEN) {
|
|
h_errno = NO_RECOVERY;
|
|
return (NULL);
|
|
}
|
|
canonname = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
/* The qname can be abbreviated, but h_name is now absolute. */
|
|
qname = canonname;
|
|
}
|
|
haveanswer = 0;
|
|
had_error = 0;
|
|
while (ancount-- > 0 && cp < eom && !had_error) {
|
|
n = dn_expand(answer->buf, eom, cp, bp, buflen);
|
|
if ((n < 0) || !(*name_ok)(bp)) {
|
|
had_error++;
|
|
continue;
|
|
}
|
|
cp += n; /* name */
|
|
type = _getshort(cp);
|
|
cp += INT16SZ; /* type */
|
|
class = _getshort(cp);
|
|
cp += INT16SZ + INT32SZ; /* class, TTL */
|
|
n = _getshort(cp);
|
|
cp += INT16SZ; /* len */
|
|
if (class != C_IN) {
|
|
/* XXX - debug? syslog? */
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
|
|
type == T_CNAME) {
|
|
n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
|
|
if ((n < 0) || !(*name_ok)(tbuf)) {
|
|
had_error++;
|
|
continue;
|
|
}
|
|
cp += n;
|
|
/* Get canonical name. */
|
|
n = strlen(tbuf) + 1; /* for the \0 */
|
|
if (n > buflen || n >= MAXHOSTNAMELEN) {
|
|
had_error++;
|
|
continue;
|
|
}
|
|
strcpy(bp, tbuf);
|
|
canonname = bp;
|
|
bp += n;
|
|
buflen -= n;
|
|
continue;
|
|
}
|
|
if (qtype == T_ANY) {
|
|
if (!(type == T_A || type == T_AAAA)) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
} else if (type != qtype) {
|
|
#ifdef DEBUG
|
|
if (type != T_KEY && type != T_SIG)
|
|
syslog(LOG_NOTICE|LOG_AUTH,
|
|
"gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
|
|
qname, p_class(C_IN), p_type(qtype),
|
|
p_type(type));
|
|
#endif
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
switch (type) {
|
|
case T_A:
|
|
case T_AAAA:
|
|
if (strcasecmp(canonname, bp) != 0) {
|
|
#ifdef DEBUG
|
|
syslog(LOG_NOTICE|LOG_AUTH,
|
|
AskedForGot, canonname, bp);
|
|
#endif
|
|
cp += n;
|
|
continue; /* XXX - had_error++ ? */
|
|
}
|
|
if (type == T_A && n != INADDRSZ) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
if (type == T_AAAA && n != IN6ADDRSZ) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
#ifdef FILTER_V4MAPPED
|
|
if (type == T_AAAA) {
|
|
struct in6_addr in6;
|
|
memcpy(&in6, cp, sizeof(in6));
|
|
if (IN6_IS_ADDR_V4MAPPED(&in6)) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
}
|
|
#endif
|
|
if (!haveanswer) {
|
|
int nn;
|
|
|
|
canonname = bp;
|
|
nn = strlen(bp) + 1; /* for the \0 */
|
|
bp += nn;
|
|
buflen -= nn;
|
|
}
|
|
|
|
/* don't overwrite pai */
|
|
ai = *pai;
|
|
ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
|
|
afd = find_afd(ai.ai_family);
|
|
if (afd == NULL) {
|
|
cp += n;
|
|
continue;
|
|
}
|
|
cur->ai_next = get_ai(&ai, afd, (const char *)cp);
|
|
if (cur->ai_next == NULL)
|
|
had_error++;
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
cp += n;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
if (!had_error)
|
|
haveanswer++;
|
|
}
|
|
if (haveanswer) {
|
|
if (!canonname)
|
|
(void)get_canonname(pai, sentinel.ai_next, qname);
|
|
else
|
|
(void)get_canonname(pai, sentinel.ai_next, canonname);
|
|
h_errno = NETDB_SUCCESS;
|
|
return sentinel.ai_next;
|
|
}
|
|
|
|
h_errno = NO_RECOVERY;
|
|
return NULL;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_dns_getaddrinfo(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
struct addrinfo *ai;
|
|
querybuf buf, buf2;
|
|
const char *name;
|
|
const struct addrinfo *pai;
|
|
struct addrinfo sentinel, *cur;
|
|
struct res_target q, q2;
|
|
|
|
name = va_arg(ap, char *);
|
|
pai = va_arg(ap, const struct addrinfo *);
|
|
|
|
memset(&q, 0, sizeof(q2));
|
|
memset(&q2, 0, sizeof(q2));
|
|
memset(&sentinel, 0, sizeof(sentinel));
|
|
cur = &sentinel;
|
|
|
|
switch (pai->ai_family) {
|
|
case AF_UNSPEC:
|
|
/* prefer IPv6 */
|
|
q.qclass = C_IN;
|
|
q.qtype = T_AAAA;
|
|
q.answer = buf.buf;
|
|
q.anslen = sizeof(buf);
|
|
q.next = &q2;
|
|
q2.qclass = C_IN;
|
|
q2.qtype = T_A;
|
|
q2.answer = buf2.buf;
|
|
q2.anslen = sizeof(buf2);
|
|
break;
|
|
case AF_INET:
|
|
q.qclass = C_IN;
|
|
q.qtype = T_A;
|
|
q.answer = buf.buf;
|
|
q.anslen = sizeof(buf);
|
|
break;
|
|
case AF_INET6:
|
|
q.qclass = C_IN;
|
|
q.qtype = T_AAAA;
|
|
q.answer = buf.buf;
|
|
q.anslen = sizeof(buf);
|
|
break;
|
|
default:
|
|
return NS_UNAVAIL;
|
|
}
|
|
if (res_searchN(name, &q) < 0)
|
|
return NS_NOTFOUND;
|
|
ai = getanswer(&buf, q.n, q.name, q.qtype, pai);
|
|
if (ai) {
|
|
cur->ai_next = ai;
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
if (q.next) {
|
|
ai = getanswer(&buf2, q2.n, q2.name, q2.qtype, pai);
|
|
if (ai)
|
|
cur->ai_next = ai;
|
|
}
|
|
if (sentinel.ai_next == NULL)
|
|
switch (h_errno) {
|
|
case HOST_NOT_FOUND:
|
|
return NS_NOTFOUND;
|
|
case TRY_AGAIN:
|
|
return NS_TRYAGAIN;
|
|
default:
|
|
return NS_UNAVAIL;
|
|
}
|
|
*((struct addrinfo **)rv) = sentinel.ai_next;
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
static void
|
|
_sethtent()
|
|
{
|
|
if (!hostf)
|
|
hostf = fopen(_PATH_HOSTS, "r" );
|
|
else
|
|
rewind(hostf);
|
|
}
|
|
|
|
static void
|
|
_endhtent()
|
|
{
|
|
if (hostf) {
|
|
(void) fclose(hostf);
|
|
hostf = NULL;
|
|
}
|
|
}
|
|
|
|
static struct addrinfo *
|
|
_gethtent(name, pai)
|
|
const char *name;
|
|
const struct addrinfo *pai;
|
|
{
|
|
char *p;
|
|
char *cp, *tname, *cname;
|
|
struct addrinfo hints, *res0, *res;
|
|
int error;
|
|
const char *addr;
|
|
char hostbuf[8*1024];
|
|
|
|
if (!hostf && !(hostf = fopen(_PATH_HOSTS, "r" )))
|
|
return (NULL);
|
|
again:
|
|
if (!(p = fgets(hostbuf, sizeof hostbuf, hostf)))
|
|
return (NULL);
|
|
if (*p == '#')
|
|
goto again;
|
|
if (!(cp = strpbrk(p, "#\n")))
|
|
goto again;
|
|
*cp = '\0';
|
|
if (!(cp = strpbrk(p, " \t")))
|
|
goto again;
|
|
*cp++ = '\0';
|
|
addr = p;
|
|
cname = NULL;
|
|
/* if this is not something we're looking for, skip it. */
|
|
while (cp && *cp) {
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
tname = cp;
|
|
if (cname == NULL)
|
|
cname = cp;
|
|
if ((cp = strpbrk(cp, " \t")) != NULL)
|
|
*cp++ = '\0';
|
|
if (strcasecmp(name, tname) == 0)
|
|
goto found;
|
|
}
|
|
goto again;
|
|
|
|
found:
|
|
hints = *pai;
|
|
hints.ai_flags = AI_NUMERICHOST;
|
|
error = getaddrinfo(addr, NULL, &hints, &res0);
|
|
if (error)
|
|
goto again;
|
|
#ifdef FILTER_V4MAPPED
|
|
/* XXX should check all items in the chain */
|
|
if (res0->ai_family == AF_INET6 &&
|
|
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
|
|
freeaddrinfo(res0);
|
|
goto again;
|
|
}
|
|
#endif
|
|
for (res = res0; res; res = res->ai_next) {
|
|
/* cover it up */
|
|
res->ai_flags = pai->ai_flags;
|
|
|
|
if (pai->ai_flags & AI_CANONNAME) {
|
|
if (get_canonname(pai, res, cname) != 0) {
|
|
freeaddrinfo(res0);
|
|
goto again;
|
|
}
|
|
}
|
|
}
|
|
return res0;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_files_getaddrinfo(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
const char *name;
|
|
const struct addrinfo *pai;
|
|
struct addrinfo sentinel, *cur;
|
|
struct addrinfo *p;
|
|
|
|
name = va_arg(ap, char *);
|
|
pai = va_arg(ap, struct addrinfo *);
|
|
|
|
memset(&sentinel, 0, sizeof(sentinel));
|
|
cur = &sentinel;
|
|
|
|
_sethtent();
|
|
while ((p = _gethtent(name, pai)) != NULL) {
|
|
cur->ai_next = p;
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
_endhtent();
|
|
|
|
*((struct addrinfo **)rv) = sentinel.ai_next;
|
|
if (sentinel.ai_next == NULL)
|
|
return NS_NOTFOUND;
|
|
return NS_SUCCESS;
|
|
}
|
|
|
|
#ifdef YP
|
|
static char *__ypdomain;
|
|
|
|
/*ARGSUSED*/
|
|
static struct addrinfo *
|
|
_yphostent(line, pai)
|
|
char *line;
|
|
const struct addrinfo *pai;
|
|
{
|
|
struct addrinfo sentinel, *cur;
|
|
struct addrinfo hints, *res, *res0;
|
|
int error;
|
|
char *p = line;
|
|
const char *addr, *canonname;
|
|
char *nextline;
|
|
char *cp;
|
|
|
|
addr = canonname = NULL;
|
|
|
|
memset(&sentinel, 0, sizeof(sentinel));
|
|
cur = &sentinel;
|
|
|
|
nextline:
|
|
/* terminate line */
|
|
cp = strchr(p, '\n');
|
|
if (cp) {
|
|
*cp++ = '\0';
|
|
nextline = cp;
|
|
} else
|
|
nextline = NULL;
|
|
|
|
cp = strpbrk(p, " \t");
|
|
if (cp == NULL) {
|
|
if (canonname == NULL)
|
|
return (NULL);
|
|
else
|
|
goto done;
|
|
}
|
|
*cp++ = '\0';
|
|
|
|
addr = p;
|
|
|
|
while (cp && *cp) {
|
|
if (*cp == ' ' || *cp == '\t') {
|
|
cp++;
|
|
continue;
|
|
}
|
|
if (!canonname)
|
|
canonname = cp;
|
|
if ((cp = strpbrk(cp, " \t")) != NULL)
|
|
*cp++ = '\0';
|
|
}
|
|
|
|
hints = *pai;
|
|
hints.ai_flags = AI_NUMERICHOST;
|
|
error = getaddrinfo(addr, NULL, &hints, &res0);
|
|
if (error == 0) {
|
|
for (res = res0; res; res = res->ai_next) {
|
|
/* cover it up */
|
|
res->ai_flags = pai->ai_flags;
|
|
|
|
if (pai->ai_flags & AI_CANONNAME)
|
|
(void)get_canonname(pai, res, canonname);
|
|
}
|
|
} else
|
|
res0 = NULL;
|
|
if (res0) {
|
|
cur->ai_next = res0;
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
|
|
if (nextline) {
|
|
p = nextline;
|
|
goto nextline;
|
|
}
|
|
|
|
done:
|
|
return sentinel.ai_next;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
_yp_getaddrinfo(rv, cb_data, ap)
|
|
void *rv;
|
|
void *cb_data;
|
|
va_list ap;
|
|
{
|
|
struct addrinfo sentinel, *cur;
|
|
struct addrinfo *ai = NULL;
|
|
static char *__ypcurrent;
|
|
int __ypcurrentlen, r;
|
|
const char *name;
|
|
const struct addrinfo *pai;
|
|
|
|
name = va_arg(ap, char *);
|
|
pai = va_arg(ap, const struct addrinfo *);
|
|
|
|
memset(&sentinel, 0, sizeof(sentinel));
|
|
cur = &sentinel;
|
|
|
|
if (!__ypdomain) {
|
|
if (_yp_check(&__ypdomain) == 0)
|
|
return NS_UNAVAIL;
|
|
}
|
|
if (__ypcurrent)
|
|
free(__ypcurrent);
|
|
__ypcurrent = NULL;
|
|
|
|
/* hosts.byname is only for IPv4 (Solaris8) */
|
|
if (pai->ai_family == PF_UNSPEC || pai->ai_family == PF_INET) {
|
|
r = yp_match(__ypdomain, "hosts.byname", name,
|
|
(int)strlen(name), &__ypcurrent, &__ypcurrentlen);
|
|
if (r == 0) {
|
|
struct addrinfo ai4;
|
|
|
|
ai4 = *pai;
|
|
ai4.ai_family = AF_INET;
|
|
ai = _yphostent(__ypcurrent, &ai4);
|
|
if (ai) {
|
|
cur->ai_next = ai;
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ipnodes.byname can hold both IPv4/v6 */
|
|
r = yp_match(__ypdomain, "ipnodes.byname", name,
|
|
(int)strlen(name), &__ypcurrent, &__ypcurrentlen);
|
|
if (r == 0) {
|
|
ai = _yphostent(__ypcurrent, pai);
|
|
if (ai) {
|
|
cur->ai_next = ai;
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
}
|
|
|
|
if (sentinel.ai_next == NULL) {
|
|
h_errno = HOST_NOT_FOUND;
|
|
return NS_NOTFOUND;
|
|
}
|
|
*((struct addrinfo **)rv) = sentinel.ai_next;
|
|
return NS_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
/* resolver logic */
|
|
|
|
extern const char *__hostalias(const char *);
|
|
extern int h_errno;
|
|
|
|
/*
|
|
* Formulate a normal query, send, and await answer.
|
|
* Returned answer is placed in supplied buffer "answer".
|
|
* Perform preliminary check of answer, returning success only
|
|
* if no error is indicated and the answer count is nonzero.
|
|
* Return the size of the response on success, -1 on error.
|
|
* Error number is left in h_errno.
|
|
*
|
|
* Caller must parse answer and determine whether it answers the question.
|
|
*/
|
|
static int
|
|
res_queryN(name, target)
|
|
const char *name; /* domain name */
|
|
struct res_target *target;
|
|
{
|
|
u_char buf[MAXPACKET];
|
|
HEADER *hp;
|
|
int n;
|
|
struct res_target *t;
|
|
int rcode;
|
|
int ancount;
|
|
|
|
rcode = NOERROR;
|
|
ancount = 0;
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return (-1);
|
|
}
|
|
|
|
for (t = target; t; t = t->next) {
|
|
int class, type;
|
|
u_char *answer;
|
|
int anslen;
|
|
|
|
hp = (HEADER *)(void *)t->answer;
|
|
hp->rcode = NOERROR; /* default */
|
|
|
|
/* make it easier... */
|
|
class = t->qclass;
|
|
type = t->qtype;
|
|
answer = t->answer;
|
|
anslen = t->anslen;
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf(";; res_query(%s, %d, %d)\n", name, class, type);
|
|
#endif
|
|
|
|
n = res_mkquery(QUERY, name, class, type, NULL, 0, NULL,
|
|
buf, sizeof(buf));
|
|
if (n > 0 && (_res.options & RES_USE_EDNS0) != 0)
|
|
n = res_opt(n, buf, sizeof(buf), anslen);
|
|
if (n <= 0) {
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf(";; res_query: mkquery failed\n");
|
|
#endif
|
|
h_errno = NO_RECOVERY;
|
|
return (n);
|
|
}
|
|
n = res_send(buf, n, answer, anslen);
|
|
#if 0
|
|
if (n < 0) {
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf(";; res_query: send error\n");
|
|
#endif
|
|
h_errno = TRY_AGAIN;
|
|
return (n);
|
|
}
|
|
#endif
|
|
|
|
if (n < 0 || hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
|
|
rcode = hp->rcode; /* record most recent error */
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf(";; rcode = %d, ancount=%d\n", hp->rcode,
|
|
ntohs(hp->ancount));
|
|
#endif
|
|
continue;
|
|
}
|
|
|
|
ancount += ntohs(hp->ancount);
|
|
|
|
t->n = n;
|
|
}
|
|
|
|
if (ancount == 0) {
|
|
switch (rcode) {
|
|
case NXDOMAIN:
|
|
h_errno = HOST_NOT_FOUND;
|
|
break;
|
|
case SERVFAIL:
|
|
h_errno = TRY_AGAIN;
|
|
break;
|
|
case NOERROR:
|
|
h_errno = NO_DATA;
|
|
break;
|
|
case FORMERR:
|
|
case NOTIMP:
|
|
case REFUSED:
|
|
default:
|
|
h_errno = NO_RECOVERY;
|
|
break;
|
|
}
|
|
return (-1);
|
|
}
|
|
return (ancount);
|
|
}
|
|
|
|
/*
|
|
* Formulate a normal query, send, and retrieve answer in supplied buffer.
|
|
* Return the size of the response on success, -1 on error.
|
|
* If enabled, implement search rules until answer or unrecoverable failure
|
|
* is detected. Error code, if any, is left in h_errno.
|
|
*/
|
|
static int
|
|
res_searchN(name, target)
|
|
const char *name; /* domain name */
|
|
struct res_target *target;
|
|
{
|
|
const char *cp, * const *domain;
|
|
HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
|
|
u_int dots;
|
|
int trailing_dot, ret, saved_herrno;
|
|
int got_nodata = 0, got_servfail = 0, tried_as_is = 0;
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return (-1);
|
|
}
|
|
|
|
errno = 0;
|
|
h_errno = HOST_NOT_FOUND; /* default, if we never query */
|
|
dots = 0;
|
|
for (cp = name; *cp; cp++)
|
|
dots += (*cp == '.');
|
|
trailing_dot = 0;
|
|
if (cp > name && *--cp == '.')
|
|
trailing_dot++;
|
|
|
|
/*
|
|
* if there aren't any dots, it could be a user-level alias
|
|
*/
|
|
if (!dots && (cp = __hostalias(name)) != NULL)
|
|
return (res_queryN(cp, target));
|
|
|
|
/*
|
|
* If there are dots in the name already, let's just give it a try
|
|
* 'as is'. The threshold can be set with the "ndots" option.
|
|
*/
|
|
saved_herrno = -1;
|
|
if (dots >= _res.ndots) {
|
|
ret = res_querydomainN(name, NULL, target);
|
|
if (ret > 0)
|
|
return (ret);
|
|
saved_herrno = h_errno;
|
|
tried_as_is++;
|
|
}
|
|
|
|
/*
|
|
* We do at least one level of search if
|
|
* - there is no dot and RES_DEFNAME is set, or
|
|
* - there is at least one dot, there is no trailing dot,
|
|
* and RES_DNSRCH is set.
|
|
*/
|
|
if ((!dots && (_res.options & RES_DEFNAMES)) ||
|
|
(dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
|
|
int done = 0;
|
|
|
|
for (domain = (const char * const *)_res.dnsrch;
|
|
*domain && !done;
|
|
domain++) {
|
|
|
|
ret = res_querydomainN(name, *domain, target);
|
|
if (ret > 0)
|
|
return (ret);
|
|
|
|
/*
|
|
* If no server present, give up.
|
|
* If name isn't found in this domain,
|
|
* keep trying higher domains in the search list
|
|
* (if that's enabled).
|
|
* On a NO_DATA error, keep trying, otherwise
|
|
* a wildcard entry of another type could keep us
|
|
* from finding this entry higher in the domain.
|
|
* If we get some other error (negative answer or
|
|
* server failure), then stop searching up,
|
|
* but try the input name below in case it's
|
|
* fully-qualified.
|
|
*/
|
|
if (errno == ECONNREFUSED) {
|
|
h_errno = TRY_AGAIN;
|
|
return (-1);
|
|
}
|
|
|
|
switch (h_errno) {
|
|
case NO_DATA:
|
|
got_nodata++;
|
|
/* FALLTHROUGH */
|
|
case HOST_NOT_FOUND:
|
|
/* keep trying */
|
|
break;
|
|
case TRY_AGAIN:
|
|
if (hp->rcode == SERVFAIL) {
|
|
/* try next search element, if any */
|
|
got_servfail++;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
default:
|
|
/* anything else implies that we're done */
|
|
done++;
|
|
}
|
|
/*
|
|
* if we got here for some reason other than DNSRCH,
|
|
* we only wanted one iteration of the loop, so stop.
|
|
*/
|
|
if (!(_res.options & RES_DNSRCH))
|
|
done++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* if we have not already tried the name "as is", do that now.
|
|
* note that we do this regardless of how many dots were in the
|
|
* name or whether it ends with a dot.
|
|
*/
|
|
if (!tried_as_is && (dots || !(_res.options & RES_NOTLDQUERY))) {
|
|
ret = res_querydomainN(name, NULL, target);
|
|
if (ret > 0)
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* if we got here, we didn't satisfy the search.
|
|
* if we did an initial full query, return that query's h_errno
|
|
* (note that we wouldn't be here if that query had succeeded).
|
|
* else if we ever got a nodata, send that back as the reason.
|
|
* else send back meaningless h_errno, that being the one from
|
|
* the last DNSRCH we did.
|
|
*/
|
|
if (saved_herrno != -1)
|
|
h_errno = saved_herrno;
|
|
else if (got_nodata)
|
|
h_errno = NO_DATA;
|
|
else if (got_servfail)
|
|
h_errno = TRY_AGAIN;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Perform a call on res_query on the concatenation of name and domain,
|
|
* removing a trailing dot from name if domain is NULL.
|
|
*/
|
|
static int
|
|
res_querydomainN(name, domain, target)
|
|
const char *name, *domain;
|
|
struct res_target *target;
|
|
{
|
|
char nbuf[MAXDNAME];
|
|
const char *longname = nbuf;
|
|
size_t n, d;
|
|
|
|
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
|
|
h_errno = NETDB_INTERNAL;
|
|
return (-1);
|
|
}
|
|
#ifdef DEBUG
|
|
if (_res.options & RES_DEBUG)
|
|
printf(";; res_querydomain(%s, %s)\n",
|
|
name, domain?domain:"<Nil>");
|
|
#endif
|
|
if (domain == NULL) {
|
|
/*
|
|
* Check for trailing '.';
|
|
* copy without '.' if present.
|
|
*/
|
|
n = strlen(name);
|
|
if (n >= MAXDNAME) {
|
|
h_errno = NO_RECOVERY;
|
|
return (-1);
|
|
}
|
|
if (n > 0 && name[--n] == '.') {
|
|
strncpy(nbuf, name, n);
|
|
nbuf[n] = '\0';
|
|
} else
|
|
longname = name;
|
|
} else {
|
|
n = strlen(name);
|
|
d = strlen(domain);
|
|
if (n + d + 1 >= MAXDNAME) {
|
|
h_errno = NO_RECOVERY;
|
|
return (-1);
|
|
}
|
|
sprintf(nbuf, "%s.%s", name, domain);
|
|
}
|
|
return (res_queryN(longname, target));
|
|
}
|