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/*
* %%% copyright-cmetz-96-bsd
* Copyright (c) 1996-1999, Craig Metz, All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Craig Metz and
* by other contributors.
* 4. Neither the name of the author nor the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/* getnameinfo() v1.38 */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <resolv.h>
#ifndef min
#define min(x,y) (((x) > (y)) ? (y) : (x))
#endif /* min */
static int
netdb_lookup_name(int family, void *addr, int addrlen, char *name,
int namelen, int flags)
{
struct hostent *hostent;
char *c, *c2;
int i;
if (!(hostent = gethostbyaddr(addr, addrlen, family))) {
switch (h_errno) {
case NETDB_INTERNAL:
return(EAI_SYSTEM);
case HOST_NOT_FOUND:
return(1);
case TRY_AGAIN:
return(EAI_AGAIN);
case NO_RECOVERY:
return(EAI_FAIL);
case NO_DATA:
return(1);
default:
return(EAI_FAIL);
}
}
endhostent();
c = hostent->h_name;
if ((flags & NI_NOFQDN) && (_res.options & RES_INIT) && _res.defdname[0] &&
(c2 = strstr(c + 1, _res.defdname)) && (*(--c2) == '.')) {
*c2 = 0;
i = min(c2 - c, namelen);
strlcpy(name, c, i);
} else
strlcpy(name, c, namelen);
return 0;
}
int
getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host,
size_t hostlen, char *serv, size_t servlen, int flags)
{
int rval;
int saved_errno;
if (sa == NULL || addrlen != sa->sa_len)
return EAI_FAIL;
saved_errno = errno;
if (host && hostlen > 0) {
switch (sa->sa_family) {
case AF_INET6:
{
struct sockaddr_in6 *sin6 = (void *)sa;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
if (flags & NI_NUMERICHOST)
goto inet6_noname;
strlcpy(host, "*", hostlen);
break;
}
if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
struct sockaddr_in sin;
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_family = AF_INET;
sin.sin_port = sin6->sin6_port;
sin.sin_addr.s_addr =
((u_int32_t *)&sin6->sin6_addr)[3];
if (!(rval = getnameinfo((struct sockaddr *)&sin,
sizeof(struct sockaddr_in), host, hostlen,
serv, servlen, flags | NI_NAMEREQD)))
goto ret;
if (rval != EAI_NONAME)
goto ret;
goto inet6_noname;
}
if (flags & NI_NUMERICHOST)
goto inet6_noname;
if ((rval = netdb_lookup_name(AF_INET6,
&sin6->sin6_addr, sizeof(struct in6_addr),
host, hostlen, flags)) < 0)
goto ret;
if (!rval)
break;
inet6_noname:
if (flags & NI_NAMEREQD) {
rval = EAI_NONAME;
goto ret;
}
if (!inet_ntop(AF_INET6, &sin6->sin6_addr, host, hostlen)) {
rval = EAI_NONAME;
goto ret;
}
break;
}
case AF_INET:
{
struct sockaddr_in *sin = (void *)sa;
if (flags & NI_NUMERICHOST)
goto inet_noname;
if (sin->sin_addr.s_addr == 0) {
strlcpy(host, "*", hostlen);
break;
}
if ((rval = netdb_lookup_name(AF_INET,
&sin->sin_addr, sizeof(struct in_addr),
host, hostlen, flags)) < 0)
goto ret;
if (!rval)
break;
inet_noname:
if (flags & NI_NAMEREQD) {
rval = EAI_NONAME;
goto ret;
}
if (!inet_ntop(AF_INET, &sin->sin_addr, host, hostlen)) {
rval = EAI_NONAME;
goto ret;
}
break;
}
case AF_LOCAL:
if (!(flags & NI_NUMERICHOST)) {
struct utsname utsname;
if (!uname(&utsname)) {
strlcpy(host, utsname.nodename, hostlen);
break;
}
}
if (flags & NI_NAMEREQD) {
rval = EAI_NONAME;
goto ret;
}
strlcpy(host, "localhost", hostlen);
break;
default:
rval = EAI_FAMILY;
goto ret;
}
}
if (serv && servlen > 0) {
switch (sa->sa_family) {
case AF_INET:
{
struct sockaddr_in *sin = (void *)sa;
struct servent *s;
if ((flags & NI_NUMERICSERV) == 0) {
s = getservbyport(sin->sin_port,
(flags & NI_DGRAM) ? "udp" : "tcp");
if (s) {
strlcpy(serv, s->s_name, servlen);
break;
}
if (sin->sin_port == 0) {
strlcpy(serv, "*", servlen);
break;
}
}
snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
break;
}
case AF_INET6:
{
struct sockaddr_in6 *sin6 = (void *)sa;
struct servent *s;
if ((flags & NI_NUMERICSERV) == 0) {
s = getservbyport(sin6->sin6_port,
(flags & NI_DGRAM) ? "udp" : "tcp");
if (s) {
strlcpy(serv, s->s_name, servlen);
break;
}
if (sin6->sin6_port == 0) {
strlcpy(serv, "*", servlen);
break;
}
}
snprintf(serv, servlen, "%d", ntohs(sin6->sin6_port));
break;
}
case AF_LOCAL:
{
struct sockaddr_un *sun = (void *)sa;
strlcpy(serv, sun->sun_path, servlen);
break;
}
}
}
rval = 0;
ret:
if (rval == 1)
rval = EAI_FAIL;
errno = saved_errno;
return (rval);
}
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