0ca229d64d
Sorry for the flapping, but no change will be done for 4.0 anymore. Official standard will be published around April or later. If different format would be adopted at that time, then support for the new format will be added to the succeeding FreeBSD 4.x. Approved by: jkh
236 lines
6.2 KiB
C
236 lines
6.2 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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* $FreeBSD$
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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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*/
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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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#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_NOSERVHOST 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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u_long 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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int noserv = 0;
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if (sa == NULL)
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return ENI_NOSOCKET;
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if (sa->sa_len != salen)
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return ENI_SALEN;
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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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noserv = 1;
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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) > 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) > 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 = 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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if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
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IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
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flags |= NI_NUMERICHOST;
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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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if (noserv == 1)
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return ENI_NOSERVHOST;
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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) > hostlen)
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return ENI_MEMORY;
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strcpy(host, numaddr);
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#ifdef INET6
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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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if (flags & NI_WITHSCOPEID) {
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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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char ifname[IF_NAMESIZE * 2 /* for safety */];
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int scopelen, numaddrlen;
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if ((if_indextoname(ifindex, ifname)) == NULL)
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return ENI_SYSTEM;
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scopelen = strlen(ifname);
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numaddrlen = strlen(host);
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if (numaddrlen + 1 /* SCOPE_DELIMITER */
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+ scopelen > hostlen)
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return ENI_MEMORY;
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/*
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* Construct <numeric-addr><delim><scopeid>
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*/
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memcpy(host + numaddrlen + 1, ifname, 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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}
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#endif /* INET6 */
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} else {
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hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error);
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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) > hostlen) {
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freehostent(hp);
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return ENI_MEMORY;
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}
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strcpy(host, hp->h_name);
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freehostent(hp);
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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) > 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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