![Guy Harris](/assets/img/avatar_default.png)
and never was - there's only an Ethereal-wide "enable name resolution" preference. Name it just "name_resolve". Replace all tests of "g_resolving_actif" with tests of "prefs.name_resolv", and replace all code that sets "g_resolving_actif" with code that sets "prefs.name_resolv", so that the setting of "prefs.name_resolv" actually affects whether names are resolved or not. svn path=/trunk/; revision=3300
1391 lines
29 KiB
C
1391 lines
29 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 1.9 2001/04/15 03:37:15 guy 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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef WIN32
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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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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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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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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#include <signal.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef AVOID_DNS_TIMEOUT
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# include <setjmp.h>
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#endif
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#ifdef NEED_INET_ATON_H
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# include "inet_aton.h"
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#endif
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#ifdef NEED_INET_V6DEFS_H
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# include "inet_v6defs.h"
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#endif
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#include "packet.h"
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#include "ipv6-utils.h"
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#include "resolv.h"
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#include "filesystem.h"
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#include "prefs.h"
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#define EPATH_ETHERS "/etc/ethers"
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#define EPATH_IPXNETS "/etc/ipxnets"
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#define EPATH_MANUF DATAFILE_DIR "/manuf"
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#define EPATH_PERSONAL_ETHERS ".ethereal/ethers" /* with "$HOME/" prefix */
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#define EPATH_PERSONAL_IPXNETS ".ethereal/ipxnets" /* with "$HOME/" prefix */
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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 HASHIPXNETSIZE 256
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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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guint addr;
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guchar name[MAXNAMELEN];
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gboolean is_dummy_entry; /* name is IP address in dot format */
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struct hashname *next;
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} hashname_t;
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/* hash table used for IPX network lookup */
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typedef struct hashname hashipxnet_t;
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/* hash tables used for ethernet and manufacturer lookup */
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typedef struct hashmanuf {
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guint8 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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guint8 addr[6];
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char name[MAXNAMELEN];
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gboolean is_dummy_entry; /* not a complete entry */
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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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guint8 addr[6];
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char name[MAXNAMELEN];
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} ether_t;
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/* internal ipxnet type */
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typedef struct _ipxnet
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{
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guint addr;
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char name[MAXNAMELEN];
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} ipxnet_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 hashname_t *sctp_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 hashipxnet_t *ipxnet_table[HASHIPXNETSIZE];
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static int eth_resolution_initialized = 0;
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static int ipxnet_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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gchar *g_ethers_path = EPATH_ETHERS;
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gchar *g_pethers_path = NULL; /* "$HOME"/EPATH_PERSONAL_ETHERS */
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gchar *g_ipxnets_path = EPATH_IPXNETS;
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gchar *g_pipxnets_path = NULL; /* "$HOME"/EPATH_PERSONAL_IPXNETS */
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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 guchar *serv_name_lookup(guint port, port_type 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 PT_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 PT_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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case PT_SCTP:
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table = sctp_port_table;
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serv_proto = "sctp";
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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 (!prefs.name_resolve ||
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(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 2 /* 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 guchar *host_name_lookup(guint addr, gboolean *found)
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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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*found = TRUE;
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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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if (tp->is_dummy_entry)
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*found = FALSE;
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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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if (prefs.name_resolve) {
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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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tp->is_dummy_entry = FALSE;
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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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}
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/* unknown host or DNS timeout */
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ip_to_str_buf((guint8 *)&addr, tp->name);
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tp->is_dummy_entry = TRUE;
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*found = FALSE;
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return (tp->name);
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} /* host_name_lookup */
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static guchar *host_name_lookup6(struct e_in6_addr *addr, gboolean *found)
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{
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static guchar name[MAXNAMELEN];
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#ifdef INET6
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struct hostent *hostp;
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if (prefs.name_resolve) {
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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 /* AVOID_DNS_TIMEOUT */
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hostp = gethostbyaddr((char *)addr, sizeof(*addr), AF_INET6);
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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(name, hostp->h_name, MAXNAMELEN);
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name[MAXNAMELEN-1] = '\0';
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*found = TRUE;
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return 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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}
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/* unknown host or DNS timeout */
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#endif /* INET6 */
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*found = FALSE;
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sprintf(name, "%s", ip6_to_str(addr));
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return (name);
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}
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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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* as well as Ethereal's '.' separator.
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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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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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}
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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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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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}
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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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|
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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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|
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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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|
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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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|
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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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|
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} /* get_ethent */
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|
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static ether_t *get_ethbyname(const guchar *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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|
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} /* get_ethbyname */
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|
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static ether_t *get_ethbyaddr(const guint8 *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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|
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while ((eth = get_ethent(1)) && memcmp(addr, eth->addr, 6) != 0)
|
|
;
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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)
|
|
;
|
|
|
|
end_ethent();
|
|
}
|
|
|
|
return eth;
|
|
|
|
} /* get_ethbyaddr */
|
|
|
|
static void add_manuf_name(guint8 *addr, guchar *name)
|
|
{
|
|
|
|
hashmanuf_t *tp;
|
|
hashmanuf_t **table = manuf_table;
|
|
|
|
tp = table[ ((int)addr[2]) & (HASHMANUFSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
tp = table[ ((int)addr[2]) & (HASHMANUFSIZE - 1)] =
|
|
(hashmanuf_t *)g_malloc(sizeof(hashmanuf_t));
|
|
} else {
|
|
while(1) {
|
|
if (tp->next == NULL) {
|
|
tp->next = (hashmanuf_t *)g_malloc(sizeof(hashmanuf_t));
|
|
tp = tp->next;
|
|
break;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
memcpy(tp->addr, addr, sizeof(tp->addr));
|
|
strncpy(tp->name, name, MAXMANUFLEN);
|
|
tp->name[MAXMANUFLEN-1] = '\0';
|
|
tp->next = NULL;
|
|
|
|
} /* add_manuf_name */
|
|
|
|
static hashmanuf_t *manuf_name_lookup(const guint8 *addr)
|
|
{
|
|
|
|
hashmanuf_t *tp;
|
|
hashmanuf_t **table = manuf_table;
|
|
|
|
tp = table[ ((int)addr[2]) & (HASHMANUFSIZE - 1)];
|
|
|
|
while(tp != NULL) {
|
|
if (memcmp(tp->addr, addr, sizeof(tp->addr)) == 0) {
|
|
return tp;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
|
|
return NULL;
|
|
|
|
} /* manuf_name_lookup */
|
|
|
|
static void initialize_ethers(void)
|
|
{
|
|
ether_t *eth;
|
|
|
|
/* Set g_pethers_path here, but don't actually do anything
|
|
* with it. It's used in get_ethbyname() and get_ethbyaddr()
|
|
*/
|
|
if (g_pethers_path == NULL) {
|
|
g_pethers_path = g_malloc(strlen(get_home_dir()) +
|
|
strlen(EPATH_PERSONAL_ETHERS) + 2);
|
|
sprintf(g_pethers_path, "%s/%s",
|
|
get_home_dir(), 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 */
|
|
|
|
static hashether_t *add_eth_name(const guint8 *addr, const guchar *name)
|
|
{
|
|
hashether_t *tp;
|
|
hashether_t **table = eth_table;
|
|
int i,j;
|
|
|
|
j = (addr[2] << 8) | addr[3];
|
|
i = (addr[4] << 8) | addr[5];
|
|
|
|
tp = table[ (i ^ j) & (HASHETHSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
tp = table[ (i ^ j) & (HASHETHSIZE - 1)] =
|
|
(hashether_t *)g_malloc(sizeof(hashether_t));
|
|
} else {
|
|
while(1) {
|
|
if (memcmp(tp->addr, addr, sizeof(tp->addr)) == 0) {
|
|
/* address already known */
|
|
if (!tp->is_dummy_entry) {
|
|
return tp;
|
|
} else {
|
|
/* replace this dummy (manuf) entry with a real name */
|
|
break;
|
|
}
|
|
}
|
|
if (tp->next == NULL) {
|
|
tp->next = (hashether_t *)g_malloc(sizeof(hashether_t));
|
|
tp = tp->next;
|
|
break;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
memcpy(tp->addr, addr, sizeof(tp->addr));
|
|
strncpy(tp->name, name, MAXNAMELEN);
|
|
tp->name[MAXNAMELEN-1] = '\0';
|
|
tp->next = NULL;
|
|
tp->is_dummy_entry = FALSE;
|
|
|
|
return tp;
|
|
|
|
} /* add_eth_name */
|
|
|
|
static guchar *eth_name_lookup(const guint8 *addr)
|
|
{
|
|
hashmanuf_t *manufp;
|
|
hashether_t *tp;
|
|
hashether_t **table = eth_table;
|
|
ether_t *eth;
|
|
int i,j;
|
|
|
|
j = (addr[2] << 8) | addr[3];
|
|
i = (addr[4] << 8) | addr[5];
|
|
|
|
tp = table[ (i ^ j) & (HASHETHSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
tp = table[ (i ^ j) & (HASHETHSIZE - 1)] =
|
|
(hashether_t *)g_malloc(sizeof(hashether_t));
|
|
} else {
|
|
while(1) {
|
|
if (memcmp(tp->addr, addr, sizeof(tp->addr)) == 0) {
|
|
return tp->name;
|
|
}
|
|
if (tp->next == NULL) {
|
|
tp->next = (hashether_t *)g_malloc(sizeof(hashether_t));
|
|
tp = tp->next;
|
|
break;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
/* 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]);
|
|
|
|
tp->is_dummy_entry = TRUE;
|
|
|
|
} else {
|
|
strncpy(tp->name, eth->name, MAXNAMELEN);
|
|
tp->name[MAXNAMELEN-1] = '\0';
|
|
tp->is_dummy_entry = FALSE;
|
|
}
|
|
|
|
return (tp->name);
|
|
|
|
} /* eth_name_lookup */
|
|
|
|
static guint8 *eth_addr_lookup(const guchar *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 */
|
|
|
|
|
|
/* IPXNETS */
|
|
static int parse_ipxnets_line(char *line, ipxnet_t *ipxnet)
|
|
{
|
|
/*
|
|
* We allow three address separators (':', '-', and '.'),
|
|
* as well as no separators
|
|
*/
|
|
|
|
gchar *cp;
|
|
guint32 a, a0, a1, a2, a3;
|
|
gboolean found_single_number = FALSE;
|
|
|
|
if ((cp = strchr(line, '#')))
|
|
*cp = '\0';
|
|
|
|
if ((cp = strtok(line, " \t\n")) == NULL)
|
|
return -1;
|
|
|
|
/* Either fill a0,a1,a2,a3 and found_single_number is FALSE,
|
|
* fill a and found_single_number is TRUE,
|
|
* or return -1
|
|
*/
|
|
if (sscanf(cp, "%x:%x:%x:%x", &a0, &a1, &a2, &a3) != 4) {
|
|
if (sscanf(cp, "%x-%x-%x-%x", &a0, &a1, &a2, &a3) != 4) {
|
|
if (sscanf(cp, "%x.%x.%x.%x", &a0, &a1, &a2, &a3) != 4) {
|
|
if (sscanf(cp, "%x", &a) == 1) {
|
|
found_single_number = TRUE;
|
|
}
|
|
else {
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((cp = strtok(NULL, " \t\n")) == NULL)
|
|
return -1;
|
|
|
|
if (found_single_number) {
|
|
ipxnet->addr = a;
|
|
}
|
|
else {
|
|
ipxnet->addr = (a0 << 24) | (a1 << 16) | (a2 << 8) | a3;
|
|
}
|
|
|
|
strncpy(ipxnet->name, cp, MAXNAMELEN);
|
|
ipxnet->name[MAXNAMELEN-1] = '\0';
|
|
|
|
return 0;
|
|
|
|
} /* parse_ipxnets_line */
|
|
|
|
static FILE *ipxnet_p = NULL;
|
|
|
|
static void set_ipxnetent(char *path)
|
|
{
|
|
if (ipxnet_p)
|
|
rewind(ipxnet_p);
|
|
else
|
|
ipxnet_p = fopen(path, "r");
|
|
}
|
|
|
|
static void end_ipxnetent(void)
|
|
{
|
|
if (ipxnet_p) {
|
|
fclose(ipxnet_p);
|
|
ipxnet_p = NULL;
|
|
}
|
|
}
|
|
|
|
static ipxnet_t *get_ipxnetent(void)
|
|
{
|
|
|
|
static ipxnet_t ipxnet;
|
|
static int size = 0;
|
|
static char *buf = NULL;
|
|
|
|
if (ipxnet_p == NULL)
|
|
return NULL;
|
|
|
|
while (fgetline(&buf, &size, ipxnet_p) >= 0) {
|
|
if (parse_ipxnets_line(buf, &ipxnet) == 0) {
|
|
return &ipxnet;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
|
|
} /* get_ipxnetent */
|
|
|
|
static ipxnet_t *get_ipxnetbyname(const guchar *name)
|
|
{
|
|
ipxnet_t *ipxnet;
|
|
|
|
set_ipxnetent(g_ipxnets_path);
|
|
|
|
while ((ipxnet = get_ipxnetent()) && strncmp(name, ipxnet->name, MAXNAMELEN) != 0)
|
|
;
|
|
|
|
if (ipxnet == NULL) {
|
|
end_ipxnetent();
|
|
|
|
set_ipxnetent(g_pipxnets_path);
|
|
|
|
while ((ipxnet = get_ipxnetent()) && strncmp(name, ipxnet->name, MAXNAMELEN) != 0)
|
|
;
|
|
|
|
end_ipxnetent();
|
|
}
|
|
|
|
return ipxnet;
|
|
|
|
} /* get_ipxnetbyname */
|
|
|
|
static ipxnet_t *get_ipxnetbyaddr(guint32 addr)
|
|
{
|
|
|
|
ipxnet_t *ipxnet;
|
|
|
|
set_ipxnetent(g_ipxnets_path);
|
|
|
|
while ((ipxnet = get_ipxnetent()) && (addr != ipxnet->addr) ) ;
|
|
|
|
if (ipxnet == NULL) {
|
|
end_ipxnetent();
|
|
|
|
set_ipxnetent(g_pipxnets_path);
|
|
|
|
while ((ipxnet = get_ipxnetent()) && (addr != ipxnet->addr) )
|
|
;
|
|
|
|
end_ipxnetent();
|
|
}
|
|
|
|
return ipxnet;
|
|
|
|
} /* get_ipxnetbyaddr */
|
|
|
|
static void initialize_ipxnets(void)
|
|
{
|
|
|
|
/* Set g_pipxnets_path here, but don't actually do anything
|
|
* with it. It's used in get_ipxnetbyname() and get_ipxnetbyaddr()
|
|
*/
|
|
if (g_pipxnets_path == NULL) {
|
|
g_pipxnets_path = g_malloc(strlen(get_home_dir()) +
|
|
strlen(EPATH_PERSONAL_IPXNETS) + 2);
|
|
sprintf(g_pipxnets_path, "%s/%s",
|
|
get_home_dir(), EPATH_PERSONAL_IPXNETS);
|
|
}
|
|
|
|
} /* initialize_ipxnets */
|
|
|
|
static hashipxnet_t *add_ipxnet_name(guint addr, const guchar *name)
|
|
{
|
|
hashipxnet_t *tp;
|
|
hashipxnet_t **table = ipxnet_table;
|
|
|
|
/* XXX - check goodness of hash function */
|
|
|
|
tp = table[ addr & (HASHIPXNETSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
tp = table[ addr & (HASHIPXNETSIZE - 1)] =
|
|
(hashipxnet_t *)g_malloc(sizeof(hashipxnet_t));
|
|
} else {
|
|
while(1) {
|
|
if (tp->next == NULL) {
|
|
tp->next = (hashipxnet_t *)g_malloc(sizeof(hashipxnet_t));
|
|
tp = tp->next;
|
|
break;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
tp->addr = addr;
|
|
strncpy(tp->name, name, MAXNAMELEN);
|
|
tp->name[MAXNAMELEN-1] = '\0';
|
|
tp->next = NULL;
|
|
|
|
return tp;
|
|
|
|
} /* add_ipxnet_name */
|
|
|
|
static guchar *ipxnet_name_lookup(const guint addr)
|
|
{
|
|
hashipxnet_t *tp;
|
|
hashipxnet_t **table = ipxnet_table;
|
|
ipxnet_t *ipxnet;
|
|
|
|
tp = table[ addr & (HASHIPXNETSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
tp = table[ addr & (HASHIPXNETSIZE - 1)] =
|
|
(hashipxnet_t *)g_malloc(sizeof(hashipxnet_t));
|
|
} else {
|
|
while(1) {
|
|
if (tp->addr == addr) {
|
|
return tp->name;
|
|
}
|
|
if (tp->next == NULL) {
|
|
tp->next = (hashipxnet_t *)g_malloc(sizeof(hashipxnet_t));
|
|
tp = tp->next;
|
|
break;
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
/* fill in a new entry */
|
|
|
|
tp->addr = addr;
|
|
tp->next = NULL;
|
|
|
|
if ( (ipxnet = get_ipxnetbyaddr(addr)) == NULL) {
|
|
/* unknown name */
|
|
sprintf(tp->name, "%X", addr);
|
|
|
|
} else {
|
|
strncpy(tp->name, ipxnet->name, MAXNAMELEN);
|
|
tp->name[MAXNAMELEN-1] = '\0';
|
|
}
|
|
|
|
return (tp->name);
|
|
|
|
} /* ipxnet_name_lookup */
|
|
|
|
static guint ipxnet_addr_lookup(const guchar *name, gboolean *success)
|
|
{
|
|
ipxnet_t *ipxnet;
|
|
hashipxnet_t *tp;
|
|
hashipxnet_t **table = ipxnet_table;
|
|
int i;
|
|
|
|
/* to be optimized (hash table from name to addr) */
|
|
for (i = 0; i < HASHIPXNETSIZE; 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 ((ipxnet = get_ipxnetbyname(name)) == NULL) {
|
|
*success = FALSE;
|
|
return 0;
|
|
}
|
|
|
|
/* add new entry in hash table */
|
|
|
|
tp = add_ipxnet_name(ipxnet->addr, name);
|
|
|
|
*success = TRUE;
|
|
return tp->addr;
|
|
|
|
} /* ipxnet_addr_lookup */
|
|
|
|
|
|
/*
|
|
* External Functions
|
|
*/
|
|
|
|
extern guchar *get_hostname(guint addr)
|
|
{
|
|
gboolean found;
|
|
|
|
if (!prefs.name_resolve)
|
|
return ip_to_str((guint8 *)&addr);
|
|
|
|
return host_name_lookup(addr, &found);
|
|
}
|
|
|
|
extern const guchar *get_hostname6(struct e_in6_addr *addr)
|
|
{
|
|
gboolean found;
|
|
|
|
#ifdef INET6
|
|
if (!prefs.name_resolve)
|
|
return ip6_to_str(addr);
|
|
if (IN6_IS_ADDR_LINKLOCAL(addr) || IN6_IS_ADDR_MULTICAST(addr))
|
|
return ip6_to_str(addr);
|
|
#endif
|
|
|
|
return host_name_lookup6(addr, &found);
|
|
}
|
|
|
|
extern void add_host_name(guint addr, const guchar *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->addr == addr) {
|
|
/* address already known */
|
|
if (!tp->is_dummy_entry) {
|
|
return;
|
|
} else {
|
|
/* replace this dummy entry with the new one */
|
|
break;
|
|
}
|
|
}
|
|
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;
|
|
tp->is_dummy_entry = FALSE;
|
|
|
|
} /* add_host_name */
|
|
|
|
extern guchar *get_udp_port(guint port)
|
|
{
|
|
static gchar str[3][MAXNAMELEN];
|
|
static gchar *cur;
|
|
|
|
if (!prefs.name_resolve) {
|
|
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, "%u", port);
|
|
return cur;
|
|
}
|
|
|
|
return serv_name_lookup(port, PT_UDP);
|
|
|
|
} /* get_udp_port */
|
|
|
|
extern guchar *get_tcp_port(guint port)
|
|
{
|
|
static gchar str[3][MAXNAMELEN];
|
|
static gchar *cur;
|
|
|
|
if (!prefs.name_resolve) {
|
|
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, "%u", port);
|
|
return cur;
|
|
}
|
|
|
|
return serv_name_lookup(port, PT_TCP);
|
|
|
|
} /* get_tcp_port */
|
|
|
|
extern guchar *get_sctp_port(guint port)
|
|
{
|
|
static gchar str[3][MAXNAMELEN];
|
|
static gchar *cur;
|
|
|
|
if (!prefs.name_resolve) {
|
|
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, "%u", port);
|
|
return cur;
|
|
}
|
|
|
|
return serv_name_lookup(port, PT_SCTP);
|
|
|
|
} /* get_sctp_port */
|
|
|
|
extern guchar *get_ether_name(const guint8 *addr)
|
|
{
|
|
if (!prefs.name_resolve)
|
|
return ether_to_str((guint8 *)addr);
|
|
|
|
if (!eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
return eth_name_lookup(addr);
|
|
|
|
} /* get_ether_name */
|
|
|
|
/* Look for an ether name in the hash, and return it if found.
|
|
* If it's not found, simply return NULL. We DO NOT make a new
|
|
* hash entry for it with the hex digits turned into a string.
|
|
*/
|
|
guchar *get_ether_name_if_known(const guint8 *addr)
|
|
{
|
|
hashether_t *tp;
|
|
hashether_t **table = eth_table;
|
|
int i,j;
|
|
|
|
/* Initialize ether structs if we're the first
|
|
* ether-related function called */
|
|
if (!prefs.name_resolve)
|
|
return NULL;
|
|
|
|
if (!eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
j = (addr[2] << 8) | addr[3];
|
|
i = (addr[4] << 8) | addr[5];
|
|
|
|
tp = table[ (i ^ j) & (HASHETHSIZE - 1)];
|
|
|
|
if( tp == NULL ) {
|
|
/* Hash key not found in table.
|
|
* Force a lookup (and a hash entry) for addr, then call
|
|
* myself. I plan on not getting into an infinite loop because
|
|
* eth_name_lookup() is guaranteed to make a hashtable entry,
|
|
* so when I call myself again, I can never get into this
|
|
* block of code again. Knock on wood...
|
|
*/
|
|
(void) eth_name_lookup(addr);
|
|
return get_ether_name_if_known(addr); /* a well-placed goto would suffice */
|
|
}
|
|
else {
|
|
while(1) {
|
|
if (memcmp(tp->addr, addr, sizeof(tp->addr)) == 0) {
|
|
if (!tp->is_dummy_entry) {
|
|
/* A name was found, and its origin is an ethers file */
|
|
return tp->name;
|
|
}
|
|
else {
|
|
/* A name was found, but it was created, not found in a file */
|
|
return NULL;
|
|
}
|
|
}
|
|
if (tp->next == NULL) {
|
|
/* Read my reason above for why I'm sure I can't get into an infinite loop */
|
|
(void) eth_name_lookup(addr);
|
|
return get_ether_name_if_known(addr); /* a well-placed goto would suffice */
|
|
}
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
g_assert_not_reached();
|
|
return NULL;
|
|
}
|
|
|
|
|
|
extern guint8 *get_ether_addr(const guchar *name)
|
|
{
|
|
|
|
/* force resolution (do not check prefs.name_resolve) */
|
|
|
|
if (!eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
return eth_addr_lookup(name);
|
|
|
|
} /* get_ether_addr */
|
|
|
|
extern void add_ether_byip(guint ip, const guint8 *eth)
|
|
{
|
|
|
|
guchar *host;
|
|
gboolean found;
|
|
|
|
/* first check that IP address can be resolved */
|
|
|
|
if ((host = host_name_lookup(ip, &found)) == NULL)
|
|
return;
|
|
|
|
/* ok, we can add this entry in the ethers hashtable */
|
|
|
|
if (found)
|
|
add_eth_name(eth, host);
|
|
|
|
} /* add_ether_byip */
|
|
|
|
extern const guchar *get_ipxnet_name(const guint32 addr)
|
|
{
|
|
|
|
if (!prefs.name_resolve) {
|
|
return ipxnet_to_str_punct(addr, '\0');
|
|
}
|
|
|
|
if (!ipxnet_resolution_initialized) {
|
|
initialize_ipxnets();
|
|
ipxnet_resolution_initialized = 1;
|
|
}
|
|
|
|
return ipxnet_name_lookup(addr);
|
|
|
|
} /* get_ipxnet_name */
|
|
|
|
extern guint32 get_ipxnet_addr(const guchar *name, gboolean *known)
|
|
{
|
|
guint32 addr;
|
|
gboolean success;
|
|
|
|
/* force resolution (do not check prefs.name_resolve) */
|
|
|
|
if (!ipxnet_resolution_initialized) {
|
|
initialize_ipxnets();
|
|
ipxnet_resolution_initialized = 1;
|
|
}
|
|
|
|
addr = ipxnet_addr_lookup(name, &success);
|
|
|
|
*known = success;
|
|
return addr;
|
|
|
|
} /* get_ipxnet_addr */
|
|
|
|
extern const guchar *get_manuf_name(const guint8 *addr)
|
|
{
|
|
static gchar str[3][MAXMANUFLEN];
|
|
static gchar *cur;
|
|
hashmanuf_t *manufp;
|
|
|
|
if (prefs.name_resolve && !eth_resolution_initialized) {
|
|
initialize_ethers();
|
|
eth_resolution_initialized = 1;
|
|
}
|
|
|
|
if (!prefs.name_resolve || ((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 */
|
|
|
|
|
|
|
|
/* Translate a string, assumed either to be a dotted-quad IP address or
|
|
* a host name, to a numeric IP address. Return TRUE if we succeed and
|
|
* set "*addrp" to that numeric IP address; return FALSE if we fail.
|
|
* Used more in the dfilter parser rather than in packet dissectors */
|
|
gboolean get_host_ipaddr(const char *host, guint32 *addrp)
|
|
{
|
|
struct in_addr ipaddr;
|
|
struct hostent *hp;
|
|
|
|
/*
|
|
* don't change it to inet_pton(AF_INET), they are not 100% compatible.
|
|
* inet_pton(AF_INET) does not support hexadecimal notation nor
|
|
* less-than-4 octet notation.
|
|
*/
|
|
if (!inet_aton(host, &ipaddr)) {
|
|
/* It's not a valid dotted-quad IP address; is it a valid
|
|
* host name? */
|
|
hp = gethostbyname(host);
|
|
if (hp == NULL) {
|
|
/* No. */
|
|
return FALSE;
|
|
/* Apparently, some versions of gethostbyaddr can
|
|
* return IPv6 addresses. */
|
|
} else if (hp->h_length <= sizeof (struct in_addr)) {
|
|
memcpy(&ipaddr, hp->h_addr, hp->h_length);
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
*addrp = ntohl(ipaddr.s_addr);
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Translate IPv6 numeric address or FQDN hostname, into binary IPv6 address.
|
|
* Return TRUE if we succeed and set "*addrp" to that numeric IP address;
|
|
* return FALSE if we fail.
|
|
*/
|
|
gboolean get_host_ipaddr6(const char *host, struct e_in6_addr *addrp)
|
|
{
|
|
struct hostent *hp;
|
|
|
|
if (inet_pton(AF_INET6, host, addrp) == 1)
|
|
return TRUE;
|
|
|
|
/* try FQDN */
|
|
#ifdef HAVE_GETHOSTBYNAME2
|
|
hp = gethostbyname2(host, AF_INET6);
|
|
#else
|
|
hp = NULL;
|
|
#endif
|
|
if (hp != NULL && hp->h_length == sizeof(struct e_in6_addr)) {
|
|
memcpy(addrp, hp->h_addr, hp->h_length);
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|