forked from osmocom/wireshark
![Laurent Deniel](/assets/img/avatar_default.png)
the following: It is now possible to enable/disable a particular protocol decoding (i.e. the protocol dissector is void or not). When a protocol is disabled, it is displayed as Data and of course, all linked sub-protocols are disabled as well. Disabling a protocol could be interesting: - in case of buggy dissectors - in case of wrong heuristics - for performance reasons - to decode the data as another protocol (TODO) Currently (if I am not wrong), all dissectors but NFS can be disabled (and dissectors that do not register protocols :-) I do not like the way the RPC sub-dissectors are disabled (in the sub-dissectors) since this could be done in the RPC dissector itself, knowing the sub-protocol hfinfo entry (this is why, I've not modified the NFS one yet). Two functions are added in proto.c : gboolean proto_is_protocol_enabled(int n); void proto_set_decoding(int n, gboolean enabled); and two MACROs which can be used in dissectors: OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree) CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree) See also the XXX in proto_dlg.c and proto.c around the new functions. svn path=/trunk/; revision=2267
209 lines
6.8 KiB
C
209 lines
6.8 KiB
C
/* packet-rip.c
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* Routines for RIPv1 and RIPv2 packet disassembly
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* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
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*
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* $Id: packet-rip.c,v 1.18 2000/08/13 14:08:42 deniel Exp $
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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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#include "config.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 <glib.h>
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#include "packet.h"
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#include "packet-rip.h"
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#define UDP_PORT_RIP 520
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static int proto_rip = -1;
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static gint ett_rip = -1;
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static gint ett_rip_vec = -1;
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static void dissect_ip_rip_vektor(guint8 version,
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const e_rip_vektor *rip_vektor, int offset, proto_tree *tree);
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static void dissect_rip_authentication(const e_rip_authentication *rip_authentication,
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int offset, proto_tree *tree);
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static void
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dissect_rip(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
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e_riphdr rip_header;
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e_rip_entry rip_entry;
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guint16 family;
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proto_tree *rip_tree = NULL;
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proto_item *ti;
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/* we do the range checking of the index when checking wether or not this is a RIP packet */
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static char *packet_type[8] = { "never used", "Request", "Response",
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"Traceon", "Traceoff", "Vendor specific (Sun)" };
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static char *version[3] = { "RIP", "RIPv1", "RIPv2" };
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OLD_CHECK_DISPLAY_AS_DATA(proto_rip, pd, offset, fd, tree);
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/* avoid alignment problem */
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memcpy(&rip_header, &pd[offset], sizeof(rip_header));
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/* Check if we 've realy got a RIP packet */
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switch(rip_header.version) {
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case RIPv1:
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/* the domain field has to be set to zero for RIPv1 */
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if(!(rip_header.domain == 0)){
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old_dissect_data(pd, offset, fd, tree);
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return;
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}
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/* the RIPv2 checks are also made for v1 packets */
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case RIPv2:
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/* check wether or not command nr. is between 1-7
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* (range checking for index of char* packet_type is done at the same time)
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*/
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if( !( (rip_header.command > 0) && (rip_header.command <= 7) )){
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old_dissect_data(pd, offset, fd, tree);
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return;
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}
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break;
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default:
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/* we only know RIPv1 and RIPv2 */
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old_dissect_data(pd, offset, fd, tree);
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return;
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}
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, version[rip_header.version] );
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if (check_col(fd, COL_INFO))
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col_add_str(fd, COL_INFO, packet_type[rip_header.command]);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_rip, NullTVB, offset, END_OF_FRAME, FALSE);
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rip_tree = proto_item_add_subtree(ti, ett_rip);
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proto_tree_add_text(rip_tree, NullTVB, offset, 1, "Command: %d (%s)", rip_header.command, packet_type[rip_header.command]);
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proto_tree_add_text(rip_tree, NullTVB, offset + 1, 1, "Version: %d", rip_header.version);
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if(rip_header.version == RIPv2)
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proto_tree_add_text(rip_tree, NullTVB, offset + 2 , 2, "Routing Domain: %d", ntohs(rip_header.domain));
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/* skip header */
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offset += RIP_HEADER_LENGTH;
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/* zero or more entries */
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while((pi.captured_len - offset) >= RIP_ENTRY_LENGTH){
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memcpy(&rip_entry, &pd[offset], sizeof(rip_entry)); /* avoid alignment problem */
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family = ntohs(rip_entry.vektor.family);
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switch (family) {
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case 2: /* IP */
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ti = proto_tree_add_text(rip_tree, NullTVB, offset,
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RIP_ENTRY_LENGTH, "IP Address: %s, Metric: %ld",
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ip_to_str((guint8 *) &(rip_entry.vektor.ip)),
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(long)ntohl(rip_entry.vektor.metric));
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dissect_ip_rip_vektor(rip_header.version, &rip_entry.vektor,
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offset, ti);
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break;
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case 0xFFFF:
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proto_tree_add_text(rip_tree, NullTVB, offset,
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RIP_ENTRY_LENGTH, "Authentication");
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dissect_rip_authentication(&rip_entry.authentication,
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offset, ti);
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break;
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default:
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proto_tree_add_text(rip_tree, NullTVB, offset,
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RIP_ENTRY_LENGTH, "Unknown address family %u",
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family);
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break;
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}
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offset += RIP_ENTRY_LENGTH;
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}
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}
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}
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static void
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dissect_ip_rip_vektor(guint8 version, const e_rip_vektor *rip_vektor,
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int offset, proto_tree *tree)
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{
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proto_tree *rip_vektor_tree;
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rip_vektor_tree = proto_item_add_subtree(tree, ett_rip_vec);
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proto_tree_add_text(rip_vektor_tree, NullTVB, offset, 2, "Address Family ID: IP");
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if(version == RIPv2)
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proto_tree_add_text(rip_vektor_tree, NullTVB, offset + 2 , 2, "Route Tag: %d",
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ntohs(rip_vektor->tag));
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proto_tree_add_text(rip_vektor_tree, NullTVB, offset + 4, 4, "IP Address: %s",
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ip_to_str((guint8 *) &(rip_vektor->ip)));
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if(version == RIPv2) {
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proto_tree_add_text(rip_vektor_tree, NullTVB, offset + 8 , 4, "Netmask: %s",
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ip_to_str((guint8 *) &(rip_vektor->mask)));
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proto_tree_add_text(rip_vektor_tree, NullTVB, offset + 12, 4, "Next Hop: %s",
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ip_to_str((guint8 *) &(rip_vektor->next_hop)));
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}
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proto_tree_add_text(rip_vektor_tree, NullTVB, offset + 16, 4, "Metric: %ld",
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(long)ntohl(rip_vektor->metric));
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}
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static void
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dissect_rip_authentication(const e_rip_authentication *rip_authentication,
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int offset, proto_tree *tree)
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{
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proto_tree *rip_authentication_tree;
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guint16 authtype;
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rip_authentication_tree = proto_item_add_subtree(tree, ett_rip_vec);
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authtype = ntohs(rip_authentication->authtype);
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proto_tree_add_text(rip_authentication_tree, NullTVB, offset + 2, 2,
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"Authentication type: %u", authtype);
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if (authtype == 2)
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proto_tree_add_text(rip_authentication_tree, NullTVB, offset + 4 , 16,
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"Password: %.16s",
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rip_authentication->authentication);
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}
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void
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proto_register_rip(void)
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{
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/* static hf_register_info hf[] = {
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{ &variable,
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{ "Name", "rip.abbreviation", TYPE, VALS_POINTER }},
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};*/
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static gint *ett[] = {
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&ett_rip,
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&ett_rip_vec,
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};
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proto_rip = proto_register_protocol("Routing Information Protocol", "rip");
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/* proto_register_field_array(proto_rip, hf, array_length(hf));*/
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_rip(void)
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{
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old_dissector_add("udp.port", UDP_PORT_RIP, dissect_rip);
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}
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