329 lines
8.2 KiB
C
329 lines
8.2 KiB
C
/* The Inner Net License, Version 2.00
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The author(s) grant permission for redistribution and use in source and
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binary forms, with or without modification, of the software and documentation
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provided that the following conditions are met:
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0. If you receive a version of the software that is specifically labelled
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as not being for redistribution (check the version message and/or README),
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you are not permitted to redistribute that version of the software in any
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way or form.
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1. All terms of the all other applicable copyrights and licenses must be
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followed.
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2. Redistributions of source code must retain the authors' copyright
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notice(s), this list of conditions, and the following disclaimer.
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3. Redistributions in binary form must reproduce the authors' copyright
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notice(s), 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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4. All advertising materials mentioning features or use of this software
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must display the following acknowledgement with the name(s) of the
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authors as specified in the copyright notice(s) substituted where
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indicated:
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This product includes software developed by <name(s)>, The Inner
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Net, and other contributors.
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5. Neither the name(s) of the author(s) 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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THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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If these license terms cause you a real problem, contact the author. */
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/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
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#define INET6 1
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#define LOCAL 1
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#define HOSTTABLE 0
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#define RESOLVER 1
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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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#if LOCAL
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#include <sys/un.h>
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#include <sys/utsname.h>
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#endif /* LOCAL */
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#include <netdb.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <alloca.h>
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#include <libc-lock.h>
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#include <arpa/inet.h>
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#ifndef AF_LOCAL
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#define AF_LOCAL AF_UNIX
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#endif /* AF_LOCAL */
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#if HOSTTABLE
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struct hostent *_addr2hostname_hosts(const char *, int, int);
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#endif /* HOSTTABLE */
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN 128
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#endif
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#ifndef min
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#define min(x,y) (((x) > (y)) ? (y) : (x))
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#endif /* min */
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static char *domain;
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static char domainbuffer[MAXHOSTNAMELEN];
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static char *nrl_domainname(void)
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{
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static int first = 1;
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if (first) {
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__libc_lock_define_initialized (static, lock);
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__libc_lock_lock (lock);
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if (first) {
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char *c;
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struct hostent *h, th;
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int tmpbuflen = 1024;
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char *tmpbuf = __alloca(tmpbuflen);
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int herror;
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first = 0;
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while (__gethostbyname_r("localhost", &th, tmpbuf, tmpbuflen, &h,
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&herror)) {
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if (herror == NETDB_INTERNAL) {
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if (errno == ERANGE) {
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tmpbuflen *= 2;
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tmpbuf = __alloca(tmpbuflen);
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}
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} else {
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break;
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}
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}
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if (h && (c = strchr(h->h_name, '.'))) {
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strcpy(domain = domainbuffer, ++c);
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goto ret;
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}
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if (!gethostname(domainbuffer, sizeof(domainbuffer))) {
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if (c = strchr(domainbuffer, '.')) {
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domain = ++c;
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goto ret;
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}
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while (__gethostbyname_r(domainbuffer, &th, tmpbuf, tmpbuflen, &h,
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&herror)) {
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if (herror == NETDB_INTERNAL) {
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if (errno == ERANGE) {
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tmpbuflen *= 2;
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tmpbuf = __alloca(tmpbuflen);
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}
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} else {
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break;
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}
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}
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if (h && (c = strchr(h->h_name, '.'))) {
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strcpy(domain = domainbuffer, ++c);
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goto ret;
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}
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}
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{
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struct in_addr in_addr;
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in_addr.s_addr = htonl(0x7f000001);
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while (__gethostbyaddr_r((const char *)&in_addr, sizeof(struct in_addr), AF_INET, &th, tmpbuf, tmpbuflen, &h, &herror)) {
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if (herror == NETDB_INTERNAL) {
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if (errno == ERANGE) {
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tmpbuflen *= 2;
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tmpbuf = __alloca(tmpbuflen);
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}
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} else {
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break;
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}
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}
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if (h && (c = strchr(h->h_name, '.'))) {
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domain = domainbuffer, ++c;
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goto ret;
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}
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}
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}
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ret:
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__libc_lock_unlock (lock);
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};
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return domain;
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};
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int getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
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{
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int serrno = errno;
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int tmpbuflen = 1024;
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int herrno;
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char *tmpbuf = __alloca(tmpbuflen);
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struct hostent th;
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if (!sa)
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return -1;
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if (host && (hostlen > 0))
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switch(sa->sa_family) {
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case AF_INET:
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#if INET6
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case AF_INET6:
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#endif /* INET6 */
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if (!(flags & NI_NUMERICHOST)) {
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struct hostent *h = NULL;
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#if HOSTTABLE
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#if INET6
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if (sa->sa_family == AF_INET6)
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h = _addr2hostname_hosts((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6);
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else
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#endif /* INET6 */
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h = _addr2hostname_hosts((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET);
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#endif /* HOSTTABLE */
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#if RESOLVER
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if (!h) {
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#if INET6
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if (sa->sa_family == AF_INET6) {
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while (__gethostbyaddr_r((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6, &th, tmpbuf, tmpbuflen, &h, &herrno)) {
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if (herrno == NETDB_INTERNAL) {
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if (errno == ERANGE) {
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tmpbuflen *= 2;
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tmpbuf = __alloca(tmpbuflen);
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} else {
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__set_h_errno(herrno);
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goto fail;
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}
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} else {
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break;
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}
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}
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} else {
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#endif /* INET6 */
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while (__gethostbyaddr_r((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET, &th, tmpbuf, tmpbuflen, &h, &herrno)) {
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if (errno == ERANGE) {
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tmpbuflen *= 2;
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tmpbuf = __alloca(tmpbuflen);
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} else {
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break;
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}
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}
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}
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}
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#endif /* RESOLVER */
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if (h) {
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if (flags & NI_NOFQDN) {
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char *c;
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if ((c = nrl_domainname()) && (c = strstr(h->h_name, c)) && (c != h->h_name) && (*(--c) == '.')) {
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strncpy(host, h->h_name, min(hostlen, (size_t) (c - h->h_name)));
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break;
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};
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};
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strncpy(host, h->h_name, hostlen);
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break;
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};
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};
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if (flags & NI_NAMEREQD)
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goto fail;
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{
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const char *c;
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#if INET6
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if (sa->sa_family == AF_INET6)
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c = inet_ntop(AF_INET6, (void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), host, hostlen);
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else
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#endif /* INET6 */
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c = inet_ntop(AF_INET, (void *)&(((struct sockaddr_in *)sa)->sin_addr), host, hostlen);
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if (!c)
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goto fail;
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};
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break;
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#if LOCAL
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case AF_LOCAL:
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if (!(flags & NI_NUMERICHOST)) {
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struct utsname utsname;
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if (!uname(&utsname)) {
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strncpy(host, utsname.nodename, hostlen);
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break;
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};
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};
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if (flags & NI_NAMEREQD)
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goto fail;
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strncpy(host, "localhost", hostlen);
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break;
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#endif /* LOCAL */
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default:
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return -1;
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};
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if (serv && (servlen > 0))
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switch(sa->sa_family) {
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case AF_INET:
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#if INET6
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case AF_INET6:
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#endif /* INET6 */
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if (!(flags & NI_NUMERICSERV)) {
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struct servent *s, ts;
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while (__getservbyport_r(((struct sockaddr_in *)sa)->sin_port, ((flags & NI_DGRAM) ? "udp" : "tcp"), &ts, tmpbuf, tmpbuflen, &s)) {
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if (herrno == NETDB_INTERNAL) {
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if (errno == ERANGE) {
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tmpbuflen *= 2;
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tmpbuf = __alloca(tmpbuflen);
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} else {
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goto fail;
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}
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} else {
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break;
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}
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}
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if (s) {
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strncpy(serv, s->s_name, servlen);
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break;
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};
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};
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snprintf(serv, servlen, "%d", ntohs(((struct sockaddr_in *)sa)->sin_port));
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break;
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#if LOCAL
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case AF_LOCAL:
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strncpy(serv, ((struct sockaddr_un *)sa)->sun_path, servlen);
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break;
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#endif /* LOCAL */
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};
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if (host && (hostlen > 0))
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host[hostlen-1] = 0;
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if (serv && (servlen > 0))
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serv[servlen-1] = 0;
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errno = serrno;
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return 0;
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fail:
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errno = serrno;
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return -1;
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};
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