277 lines
7.1 KiB
C
277 lines
7.1 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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* Issues to be discussed:
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* - Thread safe-ness must be checked
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* - Return values. There seems to be no standard for return value (RFC2553)
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* but INRIA implementation returns EAI_xxx defined for getaddrinfo().
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* - RFC2553 says that we should raise error on short buffer. X/Open says
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* we need to truncate the result. We obey RFC2553 (and X/Open should be
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* modified).
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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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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <string.h>
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#include <stddef.h>
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#include <errno.h>
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#ifdef NEED_ADDRINFO_H
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#include "addrinfo.h"
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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 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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} afdl [] = {
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#ifdef INET6
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{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
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offsetof(struct sockaddr_in6, sin6_addr)},
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#endif
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{PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
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offsetof(struct sockaddr_in, sin_addr)},
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{0, 0, 0},
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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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};
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#define ENI_NOSOCKET 0
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#define ENI_NOSERVNAME 1
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#define ENI_NOHOSTNAME 2
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#define ENI_MEMORY 3
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#define ENI_SYSTEM 4
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#define ENI_FAMILY 5
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#define ENI_SALEN 6
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int
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getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
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const struct sockaddr *sa;
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size_t salen;
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char *host;
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size_t hostlen;
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char *serv;
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size_t servlen;
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int flags;
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{
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struct afd *afd;
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struct servent *sp;
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struct hostent *hp;
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u_short port;
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int family, i;
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char *addr, *p;
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uint32_t v4a;
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int h_error;
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char numserv[512];
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char numaddr[512];
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if (sa == NULL)
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return ENI_NOSOCKET;
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#ifdef HAVE_SA_LEN /*XXX*/
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if (sa->sa_len != salen)
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return ENI_SALEN;
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#endif
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family = sa->sa_family;
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for (i = 0; afdl[i].a_af; i++)
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if (afdl[i].a_af == family) {
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afd = &afdl[i];
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goto found;
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}
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return ENI_FAMILY;
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found:
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if (salen != afd->a_socklen)
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return ENI_SALEN;
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port = ((struct sockinet *)sa)->si_port; /* network byte order */
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addr = (char *)sa + afd->a_off;
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if (serv == NULL || servlen == 0) {
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/*
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* do nothing in this case.
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* in case you are wondering if "&&" is more correct than
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* "||" here: RFC2553 says that serv == NULL OR servlen == 0
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* means that the caller does not want the result.
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*/
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} else {
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if (flags & NI_NUMERICSERV)
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sp = NULL;
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else {
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sp = getservbyport(port,
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(flags & NI_DGRAM) ? "udp" : "tcp");
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}
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if (sp) {
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if (strlen(sp->s_name) + 1 > servlen)
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return ENI_MEMORY;
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strcpy(serv, sp->s_name);
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} else {
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snprintf(numserv, sizeof(numserv), "%d", ntohs(port));
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if (strlen(numserv) + 1 > servlen)
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return ENI_MEMORY;
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strcpy(serv, numserv);
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}
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}
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switch (sa->sa_family) {
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case AF_INET:
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v4a = (uint32_t)
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ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr);
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if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
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flags |= NI_NUMERICHOST;
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v4a >>= IN_CLASSA_NSHIFT;
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if (v4a == 0)
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flags |= NI_NUMERICHOST;
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break;
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#ifdef INET6
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case AF_INET6:
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{
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struct sockaddr_in6 *sin6;
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sin6 = (struct sockaddr_in6 *)sa;
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switch (sin6->sin6_addr.s6_addr[0]) {
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case 0x00:
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if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
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;
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else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
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;
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else
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flags |= NI_NUMERICHOST;
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break;
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default:
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if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
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flags |= NI_NUMERICHOST;
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}
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else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
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flags |= NI_NUMERICHOST;
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break;
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}
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}
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break;
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#endif
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}
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if (host == NULL || hostlen == 0) {
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/*
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* do nothing in this case.
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* in case you are wondering if "&&" is more correct than
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* "||" here: RFC2553 says that host == NULL OR hostlen == 0
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* means that the caller does not want the result.
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*/
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} else if (flags & NI_NUMERICHOST) {
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/* NUMERICHOST and NAMEREQD conflicts with each other */
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if (flags & NI_NAMEREQD)
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return ENI_NOHOSTNAME;
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if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
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== NULL)
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return ENI_SYSTEM;
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if (strlen(numaddr) + 1 > hostlen)
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return ENI_MEMORY;
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strcpy(host, numaddr);
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#if defined(INET6) && defined(NI_WITHSCOPEID)
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if (afd->a_af == AF_INET6 &&
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(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr) ||
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IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr)) &&
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((struct sockaddr_in6 *)sa)->sin6_scope_id) {
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#ifndef ALWAYS_WITHSCOPE
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if (flags & NI_WITHSCOPEID)
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#endif /* !ALWAYS_WITHSCOPE */
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{
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char *ep = strchr(host, '\0');
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unsigned int ifindex =
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((struct sockaddr_in6 *)sa)->sin6_scope_id;
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*ep = SCOPE_DELIMITER;
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if ((if_indextoname(ifindex, ep + 1)) == NULL)
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/* XXX what should we do? */
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strncpy(ep + 1, "???", 3);
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}
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}
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#endif /* INET6 */
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} else {
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#ifdef USE_GETIPNODEBY
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hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
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#else
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hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
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#ifdef HAVE_H_ERRNO
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h_error = h_errno;
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#else
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h_error = EINVAL;
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#endif
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#endif
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if (hp) {
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if (flags & NI_NOFQDN) {
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p = strchr(hp->h_name, '.');
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if (p) *p = '\0';
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}
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if (strlen(hp->h_name) + 1 > hostlen) {
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#ifdef USE_GETIPNODEBY
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freehostent(hp);
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#endif
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return ENI_MEMORY;
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}
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strcpy(host, hp->h_name);
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#ifdef USE_GETIPNODEBY
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freehostent(hp);
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#endif
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} else {
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if (flags & NI_NAMEREQD)
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return ENI_NOHOSTNAME;
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if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
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== NULL)
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return ENI_NOHOSTNAME;
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if (strlen(numaddr) + 1 > hostlen)
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return ENI_MEMORY;
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strcpy(host, numaddr);
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}
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}
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return SUCCESS;
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}
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