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-rw-r--r--inet/getnameinfo.c238
1 files changed, 238 insertions, 0 deletions
diff --git a/inet/getnameinfo.c b/inet/getnameinfo.c
new file mode 100644
index 0000000000..b9454f6396
--- /dev/null
+++ b/inet/getnameinfo.c
@@ -0,0 +1,238 @@
+/* The Inner Net License, Version 2.00
+
+ The author(s) grant permission for redistribution and use in source and
+binary forms, with or without modification, of the software and documentation
+provided that the following conditions are met:
+
+0. If you receive a version of the software that is specifically labelled
+ as not being for redistribution (check the version message and/or README),
+ you are not permitted to redistribute that version of the software in any
+ way or form.
+1. All terms of the all other applicable copyrights and licenses must be
+ followed.
+2. Redistributions of source code must retain the authors' copyright
+ notice(s), this list of conditions, and the following disclaimer.
+3. Redistributions in binary form must reproduce the authors' copyright
+ notice(s), this list of conditions, and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+4. All advertising materials mentioning features or use of this software
+ must display the following acknowledgement with the name(s) of the
+ authors as specified in the copyright notice(s) substituted where
+ indicated:
+
+ This product includes software developed by <name(s)>, The Inner
+ Net, and other contributors.
+
+5. Neither the name(s) of the author(s) nor the names of its contributors
+ may be used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY ITS AUTHORS 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 AUTHORS 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.
+
+ If these license terms cause you a real problem, contact the author. */
+
+/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
+
+#define INET6 1
+#define LOCAL 1
+#define HOSTTABLE 0
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#if LOCAL
+#include <sys/un.h>
+#include <sys/utsname.h>
+#endif /* LOCAL */
+#include <netdb.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifndef AF_LOCAL
+#define AF_LOCAL AF_UNIX
+#endif /* AF_LOCAL */
+
+#if HOSTTABLE
+struct hostent *_addr2hostname_hosts(const char *, int, int);
+#endif /* HOSTTABLE */
+
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 128
+#endif
+
+#ifndef min
+#define min(x,y) (((x) > (y)) ? (y) : (x))
+#endif /* min */
+
+static char *domain;
+static char domainbuffer[MAXHOSTNAMELEN];
+
+
+static char *
+nrl_domainname (void)
+{
+ static int first = 1;
+
+ if (first) {
+ char *c;
+ struct hostent *h;
+
+ first = 0;
+
+ if ((h = gethostbyname("localhost")) && (c = strchr(h->h_name, '.')))
+ return strcpy(domain = domainbuffer, ++c);
+
+ if (!gethostname(domainbuffer, sizeof(domainbuffer))) {
+ if (c = strchr(domainbuffer, '.'))
+ return (domain = ++c);
+
+ if ((h = gethostbyname(domainbuffer)) && (c = strchr(h->h_name, '.')))
+ return strcpy(domain = domainbuffer, ++c);
+ }
+
+ {
+ struct in_addr in_addr;
+
+ in_addr.s_addr = htonl(0x7f000001);
+
+ if ((h = gethostbyaddr((const char *)&in_addr, sizeof(struct in_addr), AF_INET)) && (c = strchr(h->h_name, '.')))
+ return strcpy(domain = domainbuffer, ++c);
+ }
+
+ return NULL;
+ };
+
+ return domain;
+};
+
+int getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host, size_t hostlen, char *serv, size_t servlen, int flags)
+{
+ int serrno = errno;
+
+ if (!sa)
+ return -1;
+
+ if (host && (hostlen > 0))
+ switch(sa->sa_family) {
+ case AF_INET:
+#if INET6
+ case AF_INET6:
+#endif /* INET6 */
+ if (!(flags & NI_NUMERICHOST)) {
+ struct hostent *h = NULL;
+#if HOSTTABLE
+#if INET6
+ if (sa->sa_family == AF_INET6)
+ h = _addr2hostname_hosts((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6);
+ else
+#endif /* INET6 */
+ h = _addr2hostname_hosts((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET);
+#endif /* HOSTTABLE */
+
+#if RESOLVER
+ if (!h) {
+#if INET6
+ if (sa->sa_family == AF_INET6)
+ h = gethostbyaddr((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6);
+ else
+#endif /* INET6 */
+ h = gethostbyaddr((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET);
+ endhostent();
+ };
+#endif /* RESOLVER */
+
+ if (h) {
+ if (flags & NI_NOFQDN) {
+ char *c;
+ if ((c = nrl_domainname()) && (c = strstr(h->h_name, c)) && (c != h->h_name) && (*(--c) == '.')) {
+ strncpy(host, h->h_name, min(hostlen, (c - h->h_name)));
+ break;
+ };
+ };
+ strncpy(host, h->h_name, hostlen);
+ break;
+ };
+ };
+
+ if (flags & NI_NAMEREQD)
+ goto fail;
+
+ {
+ const char *c;
+#if INET6
+ if (sa->sa_family == AF_INET6)
+ c = inet_ntop(AF_INET6, (void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), host, hostlen);
+ else
+#endif /* INET6 */
+ c = inet_ntop(AF_INET, (void *)&(((struct sockaddr_in *)sa)->sin_addr), host, hostlen);
+
+ if (!c)
+ goto fail;
+ };
+ break;
+#if LOCAL
+ case AF_LOCAL:
+ if (!(flags & NI_NUMERICHOST)) {
+ struct utsname utsname;
+
+ if (!uname(&utsname)) {
+ strncpy(host, utsname.nodename, hostlen);
+ break;
+ };
+ };
+
+ if (flags & NI_NAMEREQD)
+ goto fail;
+
+ strncpy(host, "localhost", hostlen);
+ break;
+#endif /* LOCAL */
+ default:
+ return -1;
+ };
+
+ if (serv && (servlen > 0))
+ switch(sa->sa_family) {
+ case AF_INET:
+#if INET6
+ case AF_INET6:
+#endif /* INET6 */
+ if (!(flags & NI_NUMERICSERV)) {
+ struct servent *s;
+ if (s = getservbyport(((struct sockaddr_in *)sa)->sin_port, (flags & NI_DGRAM) ? "udp" : "tcp")) {
+ strncpy(serv, s->s_name, servlen);
+ break;
+ };
+ };
+ snprintf(serv, servlen, "%d", ntohs(((struct sockaddr_in *)sa)->sin_port));
+ break;
+#if LOCAL
+ case AF_LOCAL:
+ strncpy(serv, ((struct sockaddr_un *)sa)->sun_path, servlen);
+ break;
+#endif /* LOCAL */
+ };
+
+ if (host && (hostlen > 0))
+ host[hostlen-1] = 0;
+ if (serv && (servlen > 0))
+ serv[servlen-1] = 0;
+ errno = serrno;
+ return 0;
+
+fail:
+ errno = serrno;
+ return -1;
+};
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