791 lines
16 KiB
C
791 lines
16 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 1.5 1998/12/17 05:42:32 gram 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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#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 <stdlib.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 "ethereal.h"
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#include "packet.h"
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#include "resolv.h"
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#ifndef MAXNAMELEN
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#define MAXNAMELEN 64 /* max name length (hostname and port name) */
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#endif
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#define MAXMANUFLEN 9 /* max vendor name length with ending '\0' */
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#define HASHETHSIZE 1024
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#define HASHHOSTSIZE 1024
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#define HASHMANUFSIZE 256
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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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/* hash tables used for ethernet and manufacturer lookup */
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typedef struct hashmanuf {
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u_char addr[3];
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char name[MAXMANUFLEN];
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struct hashmanuf *next;
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} hashmanuf_t;
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typedef struct hashether {
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u_char addr[6];
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char name[MAXNAMELEN];
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struct hashether *next;
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} hashether_t;
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/* internal ethernet type */
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typedef struct _ether
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{
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u_char addr[6];
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char name[MAXNAMELEN];
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} ether_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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static hashether_t *eth_table[HASHETHSIZE];
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static hashmanuf_t *manuf_table[HASHMANUFSIZE];
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static int eth_resolution_initialized = 0;
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/*
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* Global variables (can be changed in GUI sections)
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*/
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int g_resolving_actif = 1; /* routines are active by default */
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gchar *g_ethers_path = EPATH_ETHERS;
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gchar *g_pethers_path = NULL; /* "$HOME"/EPATH_PERSONAL_ETHERS */
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gchar *g_manuf_path = EPATH_MANUF; /* may only be changed before the */
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/* first resolving call */
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/*
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* Local function definitions
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*/
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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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tp->name[MAXNAMELEN-1] = '\0';
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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 * volatile 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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tp->name[MAXNAMELEN-1] = '\0';
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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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/*
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* Miscellaneous functions
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*/
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static int fgetline(char **buf, int *size, FILE *fp)
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{
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int len;
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int c;
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if (fp == NULL)
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return -1;
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if (*buf == NULL) {
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if (*size == 0)
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*size = BUFSIZ;
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if ((*buf = g_malloc(*size)) == NULL)
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return -1;
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}
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if (feof(fp))
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return -1;
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len = 0;
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while ((c = getc(fp)) != EOF && c != '\n') {
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if (len+1 >= *size) {
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if ((*buf = g_realloc(*buf, *size += BUFSIZ)) == NULL)
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return -1;
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}
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(*buf)[len++] = c;
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}
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if (len == 0 && c == EOF)
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return -1;
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(*buf)[len] = '\0';
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return len;
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} /* fgetline */
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/*
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* Ethernet / manufacturer resolution
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*
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* The following functions implement ethernet address resolution and
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* ethers files parsing (see ethers(4)).
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*
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* /etc/manuf has the same format as ethers(4) except that names are
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* truncated to MAXMANUFLEN-1 characters and that an address contains
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* only 3 bytes (instead of 6).
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*
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* Notes:
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*
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* I decide to not use the existing functions (see ethers(3) on some
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* operating systems) for the following reasons:
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* - performance gains (use of hash tables and some other enhancements),
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* - use of two ethers files (system-wide and per user),
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* - avoid the use of NIS maps,
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* - lack of these functions on some systems.
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*
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* So the following functions do _not_ behave as the standard ones.
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*
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* -- Laurent.
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*/
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static int parse_ether_line(char *line, ether_t *eth, int six_bytes)
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{
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/*
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* See man ethers(4) for /etc/ethers file format
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* (not available on all systems).
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* We allow both ethernet address separators (':' and '-').
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*/
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gchar *cp;
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int a0, a1, a2, a3, a4, a5;
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if ((cp = strchr(line, '#')))
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*cp = '\0';
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if ((cp = strtok(line, " \t\n")) == NULL)
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return -1;
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if (six_bytes) {
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if (sscanf(cp, "%x:%x:%x:%x:%x:%x", &a0, &a1, &a2, &a3, &a4, &a5) != 6) {
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if (sscanf(cp, "%x-%x-%x-%x-%x-%x", &a0, &a1, &a2, &a3, &a4, &a5) != 6)
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return -1;
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}
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} else {
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if (sscanf(cp, "%x:%x:%x", &a0, &a1, &a2) != 3) {
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if (sscanf(cp, "%x-%x-%x", &a0, &a1, &a2) != 3)
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return -1;
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}
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}
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if ((cp = strtok(NULL, " \t\n")) == NULL)
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return -1;
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eth->addr[0] = a0;
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eth->addr[1] = a1;
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eth->addr[2] = a2;
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if (six_bytes) {
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eth->addr[3] = a3;
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eth->addr[4] = a4;
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eth->addr[5] = a5;
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} else {
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eth->addr[3] = 0;
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eth->addr[4] = 0;
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eth->addr[5] = 0;
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}
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strncpy(eth->name, cp, MAXNAMELEN);
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eth->name[MAXNAMELEN-1] = '\0';
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return 0;
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} /* parse_ether_line */
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static FILE *eth_p = NULL;
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static void set_ethent(char *path)
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{
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if (eth_p)
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rewind(eth_p);
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else
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eth_p = fopen(path, "r");
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}
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static void end_ethent(void)
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{
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if (eth_p) {
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fclose(eth_p);
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eth_p = NULL;
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}
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}
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static ether_t *get_ethent(int six_bytes)
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{
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static ether_t eth;
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static int size = 0;
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static char *buf = NULL;
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if (eth_p == NULL)
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return NULL;
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while (fgetline(&buf, &size, eth_p) >= 0) {
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if (parse_ether_line(buf, ð, six_bytes) == 0) {
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return ð
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}
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}
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return NULL;
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} /* get_ethent */
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static ether_t *get_ethbyname(u_char *name)
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{
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ether_t *eth;
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set_ethent(g_ethers_path);
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while ((eth = get_ethent(1)) && strncmp(name, eth->name, MAXNAMELEN) != 0)
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;
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if (eth == NULL) {
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end_ethent();
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set_ethent(g_pethers_path);
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while ((eth = get_ethent(1)) && strncmp(name, eth->name, MAXNAMELEN) != 0)
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;
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end_ethent();
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}
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return eth;
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} /* get_ethbyname */
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static ether_t *get_ethbyaddr(u_char *addr)
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{
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ether_t *eth;
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set_ethent(g_ethers_path);
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while ((eth = get_ethent(1)) && memcmp(addr, eth->addr, 6) != 0)
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;
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if (eth == NULL) {
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end_ethent();
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set_ethent(g_pethers_path);
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while ((eth = get_ethent(1)) && memcmp(addr, eth->addr, 6) != 0)
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;
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end_ethent();
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}
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return eth;
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} /* get_ethbyaddr */
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static void add_manuf_name(u_char *addr, u_char *name)
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{
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hashmanuf_t *tp;
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hashmanuf_t **table = manuf_table;
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tp = table[ ((int)addr[2]) & (HASHMANUFSIZE - 1)];
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if( tp == NULL ) {
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tp = table[ ((int)addr[2]) & (HASHMANUFSIZE - 1)] =
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(hashmanuf_t *)g_malloc(sizeof(hashmanuf_t));
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} else {
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while(1) {
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if (tp->next == NULL) {
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tp->next = (hashmanuf_t *)g_malloc(sizeof(hashmanuf_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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memcpy(tp->addr, addr, sizeof(tp->addr));
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strncpy(tp->name, name, MAXMANUFLEN);
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tp->name[MAXMANUFLEN-1] = '\0';
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tp->next = NULL;
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} /* add_manuf_name */
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static hashmanuf_t *manuf_name_lookup(u_char *addr)
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{
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hashmanuf_t *tp;
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hashmanuf_t **table = manuf_table;
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tp = table[ ((int)addr[2]) & (HASHMANUFSIZE - 1)];
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while(tp != NULL) {
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if (memcmp(tp->addr, addr, sizeof(tp->addr)) == 0) {
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return tp;
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}
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tp = tp->next;
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}
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return NULL;
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} /* manuf_name_lookup */
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static hashether_t *add_eth_name(u_char *addr, u_char *name)
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{
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hashether_t *tp;
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hashether_t **table = eth_table;
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int i,j;
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j = (addr[2] << 8) | addr[3];
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i = (addr[4] << 8) | addr[5];
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tp = table[ (i ^ j) & (HASHETHSIZE - 1)];
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if( tp == NULL ) {
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tp = table[ (i ^ j) & (HASHETHSIZE - 1)] =
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(hashether_t *)g_malloc(sizeof(hashether_t));
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} else {
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while(1) {
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if (tp->next == NULL) {
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tp->next = (hashether_t *)g_malloc(sizeof(hashether_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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memcpy(tp->addr, addr, sizeof(tp->addr));
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strncpy(tp->name, name, MAXNAMELEN);
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tp->name[MAXNAMELEN-1] = '\0';
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tp->next = NULL;
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return tp;
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} /* add_eth_name */
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static u_char *eth_name_lookup(u_char *addr)
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{
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hashmanuf_t *manufp;
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hashether_t *tp;
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hashether_t **table = eth_table;
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ether_t *eth;
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int i,j;
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j = (addr[2] << 8) | addr[3];
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i = (addr[4] << 8) | addr[5];
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tp = table[ (i ^ j) & (HASHETHSIZE - 1)];
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if( tp == NULL ) {
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tp = table[ (i ^ j) & (HASHETHSIZE - 1)] =
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(hashether_t *)g_malloc(sizeof(hashether_t));
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} else {
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while(1) {
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if (memcmp(tp->addr, addr, sizeof(tp->addr)) == 0) {
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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 = (hashether_t *)g_malloc(sizeof(hashether_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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|
}
|
|
}
|
|
|
|
/* fill in a new entry */
|
|
|
|
memcpy(tp->addr, addr, sizeof(tp->addr));
|
|
tp->next = NULL;
|
|
|
|
if ( (eth = get_ethbyaddr(addr)) == NULL) {
|
|
/* unknown name */
|
|
|
|
if ((manufp = manuf_name_lookup(addr)) == NULL)
|
|
sprintf(tp->name, "%s", ether_to_str((guint8 *)addr));
|
|
else
|
|
sprintf(tp->name, "%s_%02x:%02x:%02x",
|
|
manufp->name, addr[3], addr[4], addr[5]);
|
|
|
|
} else {
|
|
strncpy(tp->name, eth->name, MAXNAMELEN);
|
|
tp->name[MAXNAMELEN-1] = '\0';
|
|
}
|
|
|
|
return (tp->name);
|
|
|
|
} /* eth_name_lookup */
|
|
|
|
static u_char *eth_addr_lookup(u_char *name)
|
|
{
|
|
ether_t *eth;
|
|
hashether_t *tp;
|
|
hashether_t **table = eth_table;
|
|
int i;
|
|
|
|
/* to be optimized (hash table from name to addr) */
|
|
for (i = 0; i < HASHETHSIZE; i++) {
|
|
tp = table[i];
|
|
while (tp) {
|
|
if (strcmp(tp->name, name) == 0)
|
|
return tp->addr;
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
/* not in hash table : performs a file lookup */
|
|
|
|
if ((eth = get_ethbyname(name)) == NULL)
|
|
return NULL;
|
|
|
|
/* add new entry in hash table */
|
|
|
|
tp = add_eth_name(eth->addr, name);
|
|
|
|
return tp->addr;
|
|
|
|
} /* eth_addr_lookup */
|
|
|
|
static void initialize_ethers(void)
|
|
{
|
|
ether_t *eth;
|
|
|
|
#ifdef DEBUG_RESOLV
|
|
signal(SIGSEGV, SIG_IGN);
|
|
#endif
|
|
|
|
if (g_pethers_path == NULL) {
|
|
g_pethers_path = g_malloc(strlen(getenv("HOME")) +
|
|
strlen(EPATH_PERSONAL_ETHERS) + 2);
|
|
sprintf(g_pethers_path, "%s/%s",
|
|
(char *)getenv("HOME"), EPATH_PERSONAL_ETHERS);
|
|
}
|
|
|
|
/* manuf hash table initialization */
|
|
|
|
set_ethent(g_manuf_path);
|
|
|
|
while ((eth = get_ethent(0))) {
|
|
add_manuf_name(eth->addr, eth->name);
|
|
}
|
|
|
|
end_ethent();
|
|
|
|
} /* initialize_ethers */
|
|
|
|
/*
|
|
* External Functions
|
|
*/
|
|
|
|
extern u_char *get_hostname(u_int addr)
|
|
{
|
|
if (!g_resolving_actif)
|
|
return ip_to_str((guint8 *)&addr);
|
|
|
|
return host_name_lookup(addr);
|
|
}
|
|
|
|
extern void add_host_name(u_int addr, u_char *name)
|
|
{
|
|
|
|
hashname_t *tp;
|
|
hashname_t **table = host_table;
|
|
|
|
tp = table[ addr & (HASHHOSTSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
tp = table[ addr & (HASHHOSTSIZE - 1)] =
|
|
(hashname_t *)g_malloc(sizeof(hashname_t));
|
|
} else {
|
|
while(1) {
|
|
if (tp->next == NULL) {
|
|
tp->next = (hashname_t *)g_malloc(sizeof(hashname_t));
|
|
tp = tp->next;
|
|
break;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
strncpy(tp->name, name, MAXNAMELEN);
|
|
tp->name[MAXNAMELEN-1] = '\0';
|
|
tp->addr = addr;
|
|
tp->next = NULL;
|
|
|
|
} /* add_host_name */
|
|
|
|
extern u_char *get_udp_port(u_int port)
|
|
{
|
|
static gchar str[3][MAXNAMELEN];
|
|
static gchar *cur;
|
|
|
|
if (!g_resolving_actif) {
|
|
if (cur == &str[0][0]) {
|
|
cur = &str[1][0];
|
|
} else if (cur == &str[1][0]) {
|
|
cur = &str[2][0];
|
|
} else {
|
|
cur = &str[0][0];
|
|
}
|
|
sprintf(cur, "%d", port);
|
|
return cur;
|
|
}
|
|
|
|
return serv_name_lookup(port, IPPROTO_UDP);
|
|
|
|
} /* get_udp_port */
|
|
|
|
extern u_char *get_tcp_port(u_int port)
|
|
{
|
|
static gchar str[3][MAXNAMELEN];
|
|
static gchar *cur;
|
|
|
|
if (!g_resolving_actif) {
|
|
if (cur == &str[0][0]) {
|
|
cur = &str[1][0];
|
|
} else if (cur == &str[1][0]) {
|
|
cur = &str[2][0];
|
|
} else {
|
|
cur = &str[0][0];
|
|
}
|
|
sprintf(cur, "%d", port);
|
|
return cur;
|
|
}
|
|
|
|
return serv_name_lookup(port, IPPROTO_TCP);
|
|
|
|
} /* get_tcp_port */
|
|
|
|
extern u_char *get_ether_name(u_char *addr)
|
|
{
|
|
if (!g_resolving_actif)
|
|
return ether_to_str((guint8 *)addr);
|
|
|
|
if (!eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
return eth_name_lookup(addr);
|
|
|
|
} /* get_ether_name */
|
|
|
|
extern u_char *get_ether_addr(u_char *name)
|
|
{
|
|
|
|
/* force resolution (do not check g_resolving_actif) */
|
|
|
|
if (!eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
return eth_addr_lookup(name);
|
|
|
|
} /* get_ether_addr */
|
|
|
|
extern u_char *get_manuf_name(u_char *addr)
|
|
{
|
|
static gchar str[3][MAXMANUFLEN];
|
|
static gchar *cur;
|
|
hashmanuf_t *manufp;
|
|
|
|
if (g_resolving_actif && !eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
if (!g_resolving_actif || ((manufp = manuf_name_lookup(addr)) == NULL)) {
|
|
if (cur == &str[0][0]) {
|
|
cur = &str[1][0];
|
|
} else if (cur == &str[1][0]) {
|
|
cur = &str[2][0];
|
|
} else {
|
|
cur = &str[0][0];
|
|
}
|
|
sprintf(cur, "%02x:%02x:%02x", addr[0], addr[1], addr[2]);
|
|
return cur;
|
|
}
|
|
|
|
return manufp->name;
|
|
|
|
} /* get_manuf_name */
|