329 lines
8.2 KiB
C
329 lines
8.2 KiB
C
/* $NetBSD: getnameinfo.c,v 1.5 2003/06/03 07:33:58 itojun Exp $ */
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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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*/
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by WIDE Project and
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* its contributors.
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* 4. 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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#include <port_before.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <net/if.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 <port_after.h>
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#ifdef USE_IFNAMELINKID
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#include <net/if.h>
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#endif
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/*
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* Note that a_off will be dynamically adjusted so that to be consistent
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* with the definition of sockaddr_in{,6}.
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* The value presented below is just a guess.
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*/
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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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size_t a_socklen;
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int a_off;
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} afdl [] = {
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/* first entry is linked last... */
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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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{PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
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offsetof(struct sockaddr_in6, sin6_addr)},
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{0, 0, 0, 0},
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};
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struct sockinet {
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#ifdef HAVE_SA_LEN
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u_char si_len;
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#endif
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u_char si_family;
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u_short si_port;
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};
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static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
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size_t, int));
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#ifdef HAVE_SIN6_SCOPE_ID
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static int ip6_sa2str __P((const struct sockaddr_in6 *, char *, size_t, int));
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#endif
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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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#ifdef HAVE_SA_LEN
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size_t len;
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#endif
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int family, i;
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const char *addr;
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char *p;
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char numserv[512];
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char numaddr[512];
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const struct sockaddr_in6 *sin6;
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if (sa == NULL)
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return EAI_FAIL;
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#ifdef HAVE_SA_LEN
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len = sa->sa_len;
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if (len != salen) return EAI_FAIL;
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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 EAI_FAMILY;
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found:
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if (salen != afd->a_socklen) return EAI_FAIL;
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port = ((const struct sockinet *)sa)->si_port; /* network byte order */
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addr = (const char *)sa + afd->a_off;
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if (serv == NULL || servlen == 0) {
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/*
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* rfc2553bis says that serv == NULL or servlen == 0 means that
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* the caller does not want the result.
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*/
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} else if (flags & NI_NUMERICSERV) {
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sprintf(numserv, "%d", ntohs(port));
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if (strlen(numserv) > servlen)
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return EAI_MEMORY;
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strcpy(serv, numserv);
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} else {
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sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
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if (sp) {
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if (strlen(sp->s_name) + 1 > servlen)
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return EAI_MEMORY;
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strcpy(serv, sp->s_name);
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} else
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return EAI_NONAME;
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}
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switch (sa->sa_family) {
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case AF_INET:
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if (ntohl(*(const u_long *)addr) >> IN_CLASSA_NSHIFT == 0)
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flags |= NI_NUMERICHOST;
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break;
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case AF_INET6:
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sin6 = (const 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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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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break;
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}
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if (host == NULL || hostlen == 0) {
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/*
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* rfc2553bis says that host == NULL or hostlen == 0 means that
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* the caller does not want the result.
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*/
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} else if (flags & NI_NUMERICHOST) {
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goto numeric;
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} else {
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hp = gethostbyaddr(addr, afd->a_addrlen, afd->a_af);
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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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return EAI_MEMORY;
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strcpy(host, hp->h_name);
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} else {
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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numeric:
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switch(afd->a_af) {
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case AF_INET6:
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{
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int error;
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if ((error = ip6_parsenumeric(sa, addr, host,
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hostlen,
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flags)) != 0)
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return(error);
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break;
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}
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default:
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if (inet_ntop(afd->a_af, addr, numaddr,
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sizeof(numaddr)) == NULL)
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return EAI_NONAME;
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if (strlen(numaddr) + 1 > hostlen)
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return EAI_MEMORY;
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strcpy(host, numaddr);
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}
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}
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}
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return(0);
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}
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static int
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ip6_parsenumeric(const struct sockaddr *sa, const char *addr, char *host,
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size_t hostlen, int flags)
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{
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size_t numaddrlen;
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char numaddr[512];
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#ifndef HAVE_SIN6_SCOPE_ID
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UNUSED(sa);
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UNUSED(flags);
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#endif
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if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr))
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== NULL)
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return EAI_SYSTEM;
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numaddrlen = strlen(numaddr);
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if (numaddrlen + 1 > hostlen) /* don't forget terminator */
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return EAI_MEMORY;
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strcpy(host, numaddr);
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#ifdef HAVE_SIN6_SCOPE_ID
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if (((const struct sockaddr_in6 *)sa)->sin6_scope_id) {
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char scopebuf[MAXHOSTNAMELEN]; /* XXX */
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int scopelen;
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/* ip6_sa2str never fails */
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scopelen = ip6_sa2str((const struct sockaddr_in6 *)sa,
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scopebuf, sizeof(scopebuf), flags);
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if (scopelen + 1 + numaddrlen + 1 > hostlen)
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return EAI_MEMORY;
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/* construct <numeric-addr><delim><scopeid> */
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memcpy(host + numaddrlen + 1, scopebuf,
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scopelen);
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host[numaddrlen] = SCOPE_DELIMITER;
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host[numaddrlen + 1 + scopelen] = '\0';
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}
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#endif
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return 0;
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}
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#ifdef HAVE_SIN6_SCOPE_ID
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/* ARGSUSED */
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static int
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ip6_sa2str(const struct sockaddr_in6 *sa6, char *buf,
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size_t bufsiz, int flags)
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{
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#ifdef USE_IFNAMELINKID
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unsigned int ifindex = (unsigned int)sa6->sin6_scope_id;
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const struct in6_addr *a6 = &sa6->sin6_addr;
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#endif
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char tmp[64];
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#ifdef NI_NUMERICSCOPE
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if (flags & NI_NUMERICSCOPE) {
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sprintf(tmp, "%u", sa6->sin6_scope_id);
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if (bufsiz != 0) {
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strncpy(buf, tmp, bufsiz - 1);
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buf[bufsiz - 1] = '\0';
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}
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return(strlen(tmp));
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}
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#endif
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#ifdef USE_IFNAMELINKID
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/*
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* For a link-local address, convert the index to an interface
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* name, assuming a one-to-one mapping between links and interfaces.
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* Note, however, that this assumption is stronger than the
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* specification of the scoped address architecture; the
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* specficication says that more than one interfaces can belong to
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* a single link.
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*/
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/* if_indextoname() does not take buffer size. not a good api... */
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if ((IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) &&
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bufsiz >= IF_NAMESIZE) {
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char *p = if_indextoname(ifindex, buf);
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if (p) {
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return(strlen(p));
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}
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}
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#endif
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/* last resort */
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sprintf(tmp, "%u", sa6->sin6_scope_id);
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if (bufsiz != 0) {
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strncpy(buf, tmp, bufsiz - 1);
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buf[bufsiz - 1] = '\0';
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}
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return(strlen(tmp));
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}
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#endif
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