1116 lines
25 KiB
C
1116 lines
25 KiB
C
/*
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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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* 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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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/missing/getaddrinfo.c,v 1.10 2000/10/24 00:56:53 fenner Exp $";
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#if 0
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#include <sys/sysctl.h>
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#endif
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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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#ifndef HAVE_U_INT32_T
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#include "bittypes.h"
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#endif
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#ifndef HAVE_SOCKADDR_STORAGE
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#include "sockstorage.h"
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#endif
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#ifdef NEED_ADDRINFO_H
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#include "addrinfo.h"
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#endif
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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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#ifdef FAITH
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static int translate = NO;
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static struct in6_addr faith_prefix = IN6ADDR_ANY_INIT;
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#endif
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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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struct sockinet {
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u_char si_len;
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u_char si_family;
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u_short si_port;
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u_int32_t si_scope_id;
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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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{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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#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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{ -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 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 *, const char *,
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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_name (const char *, const struct afd *, struct addrinfo **,
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char *, const struct addrinfo *, const char *);
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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 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 (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 (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 (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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} while (0)
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#define MATCH_FAMILY(x, y, w) \
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((x) == (y) || ((w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
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#define MATCH(x, y, w) \
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((x) == (y) || ((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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} while ((ai = next) != NULL);
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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 *q = (char *)p;
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while (*q) {
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if (! isdigit(*q))
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return NO;
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q++;
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}
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return YES;
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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 afd *afd;
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const struct explore *ex;
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#ifdef FAITH
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static int firsttime = 1;
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if (firsttime) {
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/* translator hack */
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char *q = getenv("GAI");
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if (q && inet_pton(AF_INET6, q, &faith_prefix) == 1)
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translate = YES;
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firsttime = 0;
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}
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#endif
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sentinel.ai_next = NULL;
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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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/*
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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;
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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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|
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*pai = ai0;
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}
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|
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ai0 = *pai;
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|
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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;
|
|
|
|
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;
|
|
if (pai->ai_protocol == ANY && ex->e_protocol != ANY)
|
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pai->ai_protocol = ex->e_protocol;
|
|
|
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if (hostname == NULL)
|
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error = explore_null(pai, hostname, servname, &cur->ai_next);
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else
|
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error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next);
|
|
|
|
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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* 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;
|
|
|
|
if (pai->ai_flags & AI_NUMERICHOST)
|
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ERR(EAI_NONAME);
|
|
if (hostname == NULL)
|
|
ERR(EAI_NONAME);
|
|
|
|
/*
|
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* hostname as alphabetical name.
|
|
* we would like to prefer AF_INET6 than AF_INET, so we'll make a
|
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* outer loop by AFs.
|
|
*/
|
|
for (afd = afdl; afd->a_af; afd++) {
|
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*pai = ai0;
|
|
|
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if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1))
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continue;
|
|
|
|
for (ex = explore; ex->e_af >= 0; ex++) {
|
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*pai = ai0;
|
|
|
|
if (pai->ai_family == PF_UNSPEC)
|
|
pai->ai_family = afd->a_af;
|
|
|
|
if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex)))
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|
continue;
|
|
if (!MATCH(pai->ai_socktype, ex->e_socktype,
|
|
WILD_SOCKTYPE(ex))) {
|
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continue;
|
|
}
|
|
if (!MATCH(pai->ai_protocol, ex->e_protocol,
|
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WILD_PROTOCOL(ex))) {
|
|
continue;
|
|
}
|
|
|
|
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;
|
|
|
|
error = explore_fqdn(pai, hostname, servname,
|
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&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 hostent *hp;
|
|
int h_error;
|
|
int af;
|
|
char **aplist = NULL, *apbuf = NULL;
|
|
char *ap;
|
|
struct addrinfo sentinel, *cur;
|
|
int i;
|
|
#ifndef USE_GETIPNODEBY
|
|
int naddrs;
|
|
#endif
|
|
const struct afd *afd;
|
|
int error;
|
|
|
|
*res = NULL;
|
|
sentinel.ai_next = NULL;
|
|
cur = &sentinel;
|
|
|
|
/*
|
|
* Do not filter unsupported AFs here. We need to honor content of
|
|
* databases (/etc/hosts, DNS and others). Otherwise we cannot
|
|
* replace gethostbyname() by getaddrinfo().
|
|
*/
|
|
|
|
/*
|
|
* if the servname does not match socktype/protocol, ignore it.
|
|
*/
|
|
if (get_portmatch(pai, servname) != 0)
|
|
return 0;
|
|
|
|
afd = find_afd(pai->ai_family);
|
|
|
|
/*
|
|
* post-RFC2553: should look at (pai->ai_flags & AI_ADDRCONFIG)
|
|
* rather than hardcoding it. we may need to add AI_ADDRCONFIG
|
|
* handling code by ourselves in case we don't have getipnodebyname().
|
|
*/
|
|
#ifdef USE_GETIPNODEBY
|
|
hp = getipnodebyname(hostname, pai->ai_family, AI_ADDRCONFIG, &h_error);
|
|
#else
|
|
#ifdef HAVE_GETHOSTBYNAME2
|
|
hp = gethostbyname2(hostname, pai->ai_family);
|
|
#else
|
|
if (pai->ai_family != AF_INET)
|
|
return 0;
|
|
hp = gethostbyname(hostname);
|
|
#ifdef HAVE_H_ERRNO
|
|
h_error = h_errno;
|
|
#else
|
|
h_error = EINVAL;
|
|
#endif
|
|
#endif /*HAVE_GETHOSTBYNAME2*/
|
|
#endif /*USE_GETIPNODEBY*/
|
|
|
|
if (hp == NULL) {
|
|
switch (h_error) {
|
|
case HOST_NOT_FOUND:
|
|
case NO_DATA:
|
|
error = EAI_NODATA;
|
|
break;
|
|
case TRY_AGAIN:
|
|
error = EAI_AGAIN;
|
|
break;
|
|
case NO_RECOVERY:
|
|
case NETDB_INTERNAL:
|
|
default:
|
|
error = EAI_FAIL;
|
|
break;
|
|
}
|
|
} else if ((hp->h_name == NULL) || (hp->h_name[0] == 0)
|
|
|| (hp->h_addr_list[0] == NULL)) {
|
|
#ifdef USE_GETIPNODEBY
|
|
freehostent(hp);
|
|
#endif
|
|
hp = NULL;
|
|
error = EAI_FAIL;
|
|
}
|
|
|
|
if (hp == NULL)
|
|
goto free;
|
|
|
|
#ifdef USE_GETIPNODEBY
|
|
aplist = hp->h_addr_list;
|
|
#else
|
|
/*
|
|
* hp will be overwritten if we use gethostbyname2().
|
|
* always deep copy for simplification.
|
|
*/
|
|
for (naddrs = 0; hp->h_addr_list[naddrs] != NULL; naddrs++)
|
|
;
|
|
naddrs++;
|
|
aplist = (char **)malloc(sizeof(aplist[0]) * naddrs);
|
|
apbuf = (char *)malloc(hp->h_length * naddrs);
|
|
if (aplist == NULL || apbuf == NULL) {
|
|
error = EAI_MEMORY;
|
|
goto free;
|
|
}
|
|
memset(aplist, 0, sizeof(aplist[0]) * naddrs);
|
|
for (i = 0; i < naddrs; i++) {
|
|
if (hp->h_addr_list[i] == NULL) {
|
|
aplist[i] = NULL;
|
|
continue;
|
|
}
|
|
memcpy(&apbuf[i * hp->h_length], hp->h_addr_list[i],
|
|
hp->h_length);
|
|
aplist[i] = &apbuf[i * hp->h_length];
|
|
}
|
|
#endif
|
|
|
|
for (i = 0; aplist[i] != NULL; i++) {
|
|
af = hp->h_addrtype;
|
|
ap = aplist[i];
|
|
#ifdef AF_INET6
|
|
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);
|
|
}
|
|
#endif
|
|
|
|
if (af != pai->ai_family)
|
|
continue;
|
|
|
|
if ((pai->ai_flags & AI_CANONNAME) == 0) {
|
|
GET_AI(cur->ai_next, afd, ap);
|
|
GET_PORT(cur->ai_next, servname);
|
|
} else {
|
|
/*
|
|
* if AI_CANONNAME and if reverse lookup
|
|
* fail, return ai anyway to pacify
|
|
* calling application.
|
|
*
|
|
* XXX getaddrinfo() is a name->address
|
|
* translation function, and it looks
|
|
* strange that we do addr->name
|
|
* translation here.
|
|
*/
|
|
get_name(ap, afd, &cur->ai_next,
|
|
ap, pai, servname);
|
|
}
|
|
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
}
|
|
|
|
*res = sentinel.ai_next;
|
|
return 0;
|
|
|
|
free:
|
|
#ifdef USE_GETIPNODEBY
|
|
if (hp)
|
|
freehostent(hp);
|
|
#endif
|
|
if (aplist)
|
|
free(aplist);
|
|
if (apbuf)
|
|
free(apbuf);
|
|
if (sentinel.ai_next)
|
|
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, hostname, servname, res)
|
|
const struct addrinfo *pai;
|
|
const char *hostname;
|
|
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 (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];
|
|
int flags;
|
|
|
|
*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);
|
|
flags = pai->ai_flags;
|
|
|
|
if (inet_pton(afd->a_af, hostname, pton) == 1) {
|
|
u_int32_t v4a;
|
|
#ifdef INET6
|
|
u_char pfx;
|
|
#endif
|
|
|
|
switch (afd->a_af) {
|
|
case AF_INET:
|
|
v4a = (u_int32_t)ntohl(((struct in_addr *)pton)->s_addr);
|
|
if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
|
|
flags &= ~AI_CANONNAME;
|
|
v4a >>= IN_CLASSA_NSHIFT;
|
|
if (v4a == 0 || v4a == IN_LOOPBACKNET)
|
|
flags &= ~AI_CANONNAME;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pfx = ((struct in6_addr *)pton)->s6_addr[0];
|
|
if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
|
|
flags &= ~AI_CANONNAME;
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
if (pai->ai_family == afd->a_af ||
|
|
pai->ai_family == PF_UNSPEC /*?*/) {
|
|
if ((flags & AI_CANONNAME) == 0) {
|
|
GET_AI(cur->ai_next, afd, pton);
|
|
GET_PORT(cur->ai_next, servname);
|
|
} else {
|
|
/*
|
|
* if AI_CANONNAME and if reverse lookup
|
|
* fail, return ai anyway to pacify
|
|
* calling application.
|
|
*
|
|
* XXX getaddrinfo() is a name->address
|
|
* translation function, and it looks
|
|
* strange that we do addr->name
|
|
* translation here.
|
|
*/
|
|
get_name(pton, afd, &cur->ai_next,
|
|
pton, pai, servname);
|
|
}
|
|
while (cur && cur->ai_next)
|
|
cur = cur->ai_next;
|
|
} else
|
|
ERR(EAI_FAMILY); /*xxx*/
|
|
}
|
|
|
|
*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;
|
|
int scope;
|
|
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->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';
|
|
|
|
cp++;
|
|
switch (pai->ai_family) {
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
scope = if_nametoindex(cp);
|
|
if (scope == 0) {
|
|
free(hostname2);
|
|
return (EAI_NONAME);
|
|
}
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
error = explore_numeric(pai, hostname2, servname, res);
|
|
if (error == 0) {
|
|
for (cur = *res; cur; cur = cur->ai_next) {
|
|
if (cur->ai_family != AF_INET6)
|
|
continue;
|
|
sin6 = (struct sockaddr_in6 *)cur->ai_addr;
|
|
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
|
|
IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr))
|
|
sin6->sin6_scope_id = scope;
|
|
}
|
|
}
|
|
|
|
free(hostname2);
|
|
|
|
return error;
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
get_name(addr, afd, res, numaddr, pai, servname)
|
|
const char *addr;
|
|
const struct afd *afd;
|
|
struct addrinfo **res;
|
|
char *numaddr;
|
|
const struct addrinfo *pai;
|
|
const char *servname;
|
|
{
|
|
struct hostent *hp = NULL;
|
|
struct addrinfo *cur = NULL;
|
|
int error = 0;
|
|
char *ap = NULL, *cn = NULL;
|
|
#ifdef USE_GETIPNODEBY
|
|
int h_error;
|
|
|
|
hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
|
|
#else
|
|
hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
|
|
#endif
|
|
if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
|
|
#ifdef USE_GETIPNODEBY
|
|
GET_AI(cur, afd, hp->h_addr_list[0]);
|
|
GET_PORT(cur, servname);
|
|
GET_CANONNAME(cur, hp->h_name);
|
|
#else
|
|
/* hp will be damaged if we use gethostbyaddr() */
|
|
if ((ap = (char *)malloc(hp->h_length)) == NULL) {
|
|
error = EAI_MEMORY;
|
|
goto free;
|
|
}
|
|
memcpy(ap, hp->h_addr_list[0], hp->h_length);
|
|
if ((cn = strdup(hp->h_name)) == NULL) {
|
|
error = EAI_MEMORY;
|
|
goto free;
|
|
}
|
|
|
|
GET_AI(cur, afd, ap);
|
|
GET_PORT(cur, servname);
|
|
GET_CANONNAME(cur, cn);
|
|
free(ap); ap = NULL;
|
|
free(cn); cn = NULL;
|
|
#endif
|
|
} else {
|
|
GET_AI(cur, afd, numaddr);
|
|
GET_PORT(cur, servname);
|
|
}
|
|
|
|
#ifdef USE_GETIPNODEBY
|
|
if (hp)
|
|
freehostent(hp);
|
|
#endif
|
|
*res = cur;
|
|
return SUCCESS;
|
|
free:
|
|
if (cur)
|
|
freeaddrinfo(cur);
|
|
if (ap)
|
|
free(ap);
|
|
if (cn)
|
|
free(cn);
|
|
#ifdef USE_GETIPNODEBY
|
|
if (hp)
|
|
freehostent(hp);
|
|
#endif
|
|
*res = NULL;
|
|
return error;
|
|
}
|
|
|
|
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 *)(ai + 1);
|
|
memset(ai->ai_addr, 0, afd->a_socklen);
|
|
#ifdef HAVE_SOCKADDR_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 *)(ai->ai_addr);
|
|
memcpy(p + afd->a_off, addr, 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. */
|
|
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 *)ai->ai_addr)->sin_port = port;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)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;
|
|
}
|