forked from osmocom/wireshark
272 lines
5.6 KiB
C
272 lines
5.6 KiB
C
/* resolv.c
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* Routines for network object lookup
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*
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* $Id: resolv.c,v 1.2 1998/09/16 03:22:18 gerald Exp $
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*
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* Laurent Deniel <deniel@worldnet.fr>
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*
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* To do:
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*
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* - Add ethernet address resolution
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* - In a future live capture and decode mode,
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* add hostname entries in hash table from DNS packet decoding.
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*
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifndef AVOID_DNS_TIMEOUT
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#define AVOID_DNS_TIMEOUT
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#endif
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#include <gtk/gtk.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <netdb.h>
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#include <signal.h>
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#include <sys/socket.h>
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#ifdef AVOID_DNS_TIMEOUT
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# include <setjmp.h>
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#endif
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#include "packet.h"
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#include "resolv.h"
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#define MAXNAMELEN 64 /* max name length (hostname and port name) */
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#define HASHHOSTSIZE 1024
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#define HASHPORTSIZE 256
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/* hash table used for host and port lookup */
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typedef struct hashname {
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u_int addr;
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u_char name[MAXNAMELEN];
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struct hashname *next;
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} hashname_t;
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static hashname_t *host_table[HASHHOSTSIZE];
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static hashname_t *udp_port_table[HASHPORTSIZE];
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static hashname_t *tcp_port_table[HASHPORTSIZE];
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/* global variable that indicates if name resolving is actif */
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int g_resolving_actif = 1; /* routines are active by default */
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/* local function definitions */
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static u_char *serv_name_lookup(u_int port, u_int proto)
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{
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hashname_t *tp;
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hashname_t **table;
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char *serv_proto = NULL;
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struct servent *servp;
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int i;
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switch(proto) {
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case IPPROTO_UDP:
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table = udp_port_table;
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serv_proto = "udp";
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break;
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case IPPROTO_TCP:
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table = tcp_port_table;
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serv_proto = "tcp";
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break;
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default:
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/* not yet implemented */
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return NULL;
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/*NOTREACHED*/
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break;
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} /* proto */
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i = port & (HASHPORTSIZE - 1);
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tp = table[ i & (HASHPORTSIZE - 1)];
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if( tp == NULL ) {
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tp = table[ i & (HASHPORTSIZE - 1)] =
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(hashname_t *)g_malloc(sizeof(hashname_t));
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} else {
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while(1) {
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if( tp->addr == port ) {
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return tp->name;
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}
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if (tp->next == NULL) {
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tp->next = (hashname_t *)g_malloc(sizeof(hashname_t));
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tp = tp->next;
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break;
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}
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tp = tp->next;
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}
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}
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/* fill in a new entry */
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tp->addr = port;
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tp->next = NULL;
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if ((servp = getservbyport(htons(port), serv_proto)) == NULL) {
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/* unknown port */
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sprintf(tp->name, "%d", port);
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} else {
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strncpy(tp->name, servp->s_name, MAXNAMELEN);
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}
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return (tp->name);
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} /* serv_name_lookup */
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#ifdef AVOID_DNS_TIMEOUT
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#define DNS_TIMEOUT 5 /* max sec per call */
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jmp_buf hostname_env;
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static void abort_network_query(int sig)
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{
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longjmp(hostname_env, 1);
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}
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#endif /* AVOID_DNS_TIMEOUT */
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static u_char *host_name_lookup(u_int addr)
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{
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hashname_t *tp;
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hashname_t **table = host_table;
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struct hostent *hostp;
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tp = table[ addr & (HASHHOSTSIZE - 1)];
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if( tp == NULL ) {
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tp = table[ addr & (HASHHOSTSIZE - 1)] =
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(hashname_t *)g_malloc(sizeof(hashname_t));
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} else {
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while(1) {
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if( tp->addr == addr ) {
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return tp->name;
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}
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if (tp->next == NULL) {
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tp->next = (hashname_t *)g_malloc(sizeof(hashname_t));
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tp = tp->next;
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break;
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}
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tp = tp->next;
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}
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}
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/* fill in a new entry */
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tp->addr = addr;
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tp->next = NULL;
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#ifdef AVOID_DNS_TIMEOUT
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/* Quick hack to avoid DNS/YP timeout */
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if (!setjmp(hostname_env)) {
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signal(SIGALRM, abort_network_query);
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alarm(DNS_TIMEOUT);
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#endif
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hostp = gethostbyaddr((char *)&addr, 4, AF_INET);
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#ifdef AVOID_DNS_TIMEOUT
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alarm(0);
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#endif
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if (hostp != NULL) {
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strncpy(tp->name, hostp->h_name, MAXNAMELEN);
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return tp->name;
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}
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#ifdef AVOID_DNS_TIMEOUT
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}
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#endif
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/* unknown host or DNS timeout */
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sprintf(tp->name, "%s", ip_to_str((guint8 *)&addr));
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return (tp->name);
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} /* host_name_lookup */
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/* external functions */
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extern u_char *get_hostname(u_int addr)
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{
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if (!g_resolving_actif)
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return ip_to_str((guint8 *)&addr);
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return host_name_lookup(addr);
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}
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extern u_char *get_udp_port(u_int port)
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{
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static gchar str[3][MAXNAMELEN];
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static gchar *cur;
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if (!g_resolving_actif) {
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if (cur == &str[0][0]) {
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cur = &str[1][0];
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} else if (cur == &str[1][0]) {
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cur = &str[2][0];
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} else {
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cur = &str[0][0];
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}
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sprintf(cur, "%d", port);
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return cur;
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}
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return serv_name_lookup(port, IPPROTO_UDP);
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} /* get_udp_port */
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extern u_char *get_tcp_port(u_int port)
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{
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static gchar str[3][MAXNAMELEN];
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static gchar *cur;
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if (!g_resolving_actif) {
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if (cur == &str[0][0]) {
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cur = &str[1][0];
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} else if (cur == &str[1][0]) {
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cur = &str[2][0];
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} else {
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cur = &str[0][0];
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}
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sprintf(cur, "%d", port);
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return cur;
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}
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return serv_name_lookup(port, IPPROTO_TCP);
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} /* get_tcp_port */
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