128 lines
3.6 KiB
C
128 lines
3.6 KiB
C
/*
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* Copyright (c) 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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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*
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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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*
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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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*
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* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: getnameinfo.c,v 1.2 1999/12/03 04:10:07 assar Exp $");
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#endif
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#include "roken.h"
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static int
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doit (int af,
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const void *addr,
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size_t addrlen,
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int port,
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char *host, size_t hostlen,
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char *serv, size_t servlen,
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int flags)
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{
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if (host != NULL) {
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if (flags & NI_NUMERICHOST) {
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if (inet_ntop (af, addr, host, hostlen) == NULL)
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return EAI_SYSTEM;
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} else {
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struct hostent *he = gethostbyaddr (addr,
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addrlen,
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af);
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if (he != NULL) {
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strlcpy (host, he->h_name, hostlen);
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if (flags & NI_NOFQDN) {
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char *dot = strchr (host, '.');
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if (dot != NULL)
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*dot = '\0';
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}
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} else if (flags & NI_NAMEREQD) {
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return EAI_NONAME;
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} else if (inet_ntop (AF_INET, addr, host, hostlen) == NULL)
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return EAI_SYSTEM;
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}
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}
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if (serv != NULL) {
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if (flags & NI_NUMERICSERV) {
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snprintf (serv, servlen, "%u", ntohs(port));
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} else {
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const char *proto = "tcp";
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struct servent *se;
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if (flags & NI_DGRAM)
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proto = "udp";
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se = getservbyport (port, proto);
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if (se == NULL) {
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snprintf (serv, servlen, "%u", ntohs(port));
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} else {
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strlcpy (serv, se->s_name, servlen);
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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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/*
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*
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*/
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int
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getnameinfo(const struct sockaddr *sa, socklen_t salen,
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char *host, size_t hostlen,
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char *serv, size_t servlen,
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int flags)
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{
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switch (sa->sa_family) {
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#ifdef HAVE_IPV6
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case AF_INET6 : {
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const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
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return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
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sin6->sin6_port,
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host, hostlen,
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serv, servlen,
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flags);
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}
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#endif
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case AF_INET : {
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const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
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return doit (AF_INET, &sin->sin_addr, sizeof(sin->sin_addr),
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sin->sin_port,
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host, hostlen,
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serv, servlen,
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flags);
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}
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default :
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return EAI_FAMILY;
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}
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}
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