forked from osmocom/wireshark
224 lines
8.4 KiB
C
224 lines
8.4 KiB
C
/* packet-vrrp.c
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* Routines for the Virtual Router Redundancy Protocol (VRRP)
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* RFC2338
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*
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* Heikki Vatiainen <hessu@cs.tut.fi>
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*
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* $Id: packet-vrrp.c,v 1.8 2000/08/13 14:09:08 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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#ifdef HAVE_CONFIG_H
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# include "config.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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#include <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "packet-ip.h"
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static gint proto_vrrp = -1;
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static gint ett_vrrp = -1;
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static gint ett_vrrp_ver_type = -1;
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static gint hf_vrrp_ver_type = -1;
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static gint hf_vrrp_version = -1;
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static gint hf_vrrp_type = -1;
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struct vrrp_header {
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#define VRRP_VERSION_MASK 0xf0
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#define VRRP_TYPE_MASK 0x0f
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guint8 ver_type;
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guint8 vrouter_id;
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guint8 priority;
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guint8 count_ip_addrs;
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guint8 auth_type;
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guint8 adver_int;
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guint16 checksum;
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/* One or more IP addresses */
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/* 8 octets of authentication data */
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#define VRRP_AUTH_DATA_LEN 8
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};
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#define VRRP_TYPE_ADVERTISEMENT 1
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static const value_string vrrp_type_vals[] = {
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{VRRP_TYPE_ADVERTISEMENT, "Advertisement"}
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};
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#define VRRP_AUTH_TYPE_NONE 0
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#define VRRP_AUTH_TYPE_SIMPLE_TEXT 1
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#define VRRP_AUTH_TYPE_IP_AUTH_HDR 2
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static const value_string vrrp_auth_vals[] = {
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{VRRP_AUTH_TYPE_NONE, "No Authentication"},
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{VRRP_AUTH_TYPE_SIMPLE_TEXT, "Simple Text Authentication"},
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{VRRP_AUTH_TYPE_IP_AUTH_HDR, "IP Authentication Header"}
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};
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#define VRRP_PRIORITY_MASTER_STOPPING 0
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/* Values between 1 and 254 inclusive are for backup VRRP routers */
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#define VRRP_PRIORITY_DEFAULT 100
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#define VRRP_PRIORITY_OWNER 255
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static const value_string vrrp_prio_vals[] = {
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{VRRP_PRIORITY_MASTER_STOPPING, "Current Master has stopped participating in VRRP"},
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{VRRP_PRIORITY_DEFAULT, "Default priority for a backup VRRP router"},
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{VRRP_PRIORITY_OWNER, "This VRRP router owns the virtual router's IP address(es)"}
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};
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static void
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dissect_vrrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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struct vrrp_header vrh;
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gboolean short_hdr = FALSE;
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gboolean short_packet = FALSE;
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guint calculated_len = -1; /* initialize to silence false warning from gcc */
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OLD_CHECK_DISPLAY_AS_DATA(proto_vrrp, pd, offset, fd, tree);
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if (sizeof(struct vrrp_header) > END_OF_FRAME)
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short_hdr = short_packet = TRUE;
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else {
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memcpy(&vrh, pd + offset, sizeof(struct vrrp_header));
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calculated_len = sizeof(struct vrrp_header) + vrh.count_ip_addrs*4 + VRRP_AUTH_DATA_LEN;
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if (calculated_len > END_OF_FRAME)
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short_packet = TRUE;
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}
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "VRRP");
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if (check_col(fd, COL_INFO)) {
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if (short_hdr)
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col_add_fstr(fd, COL_INFO, "Short packet header, length %u", END_OF_FRAME);
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else if (short_packet)
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col_add_fstr(fd, COL_INFO, "Packet length mismatch, calculated %u, real %u",
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calculated_len, END_OF_FRAME);
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else
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col_add_fstr(fd, COL_INFO, "%s (v%u)", "Announcement", hi_nibble(vrh.ver_type));
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}
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if (tree) {
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proto_item *ti, *tv;
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proto_tree *vrrp_tree, *ver_type_tree;
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guint8 ip_count, auth_len, auth_buf[VRRP_AUTH_DATA_LEN+1];
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if (short_hdr) {
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old_dissect_data(pd, offset, fd, tree);
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return;
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}
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ti = proto_tree_add_item(tree, proto_vrrp, NullTVB, offset, END_OF_FRAME, FALSE);
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vrrp_tree = proto_item_add_subtree(ti, ett_vrrp);
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tv = proto_tree_add_uint_format(vrrp_tree, hf_vrrp_ver_type, NullTVB, offset, 1,
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vrh.ver_type, "Version %u, Packet type %u (%s)",
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hi_nibble(vrh.ver_type), lo_nibble(vrh.ver_type),
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val_to_str(lo_nibble(vrh.ver_type), vrrp_type_vals, "Unknown"));
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ver_type_tree = proto_item_add_subtree(tv, ett_vrrp_ver_type);
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proto_tree_add_uint(ver_type_tree, hf_vrrp_version, NullTVB, offset, 1, vrh.ver_type);
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proto_tree_add_uint(ver_type_tree, hf_vrrp_type, NullTVB, offset, 1, vrh.ver_type);
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offset++;
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proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Virtual Router ID: %u", vrh.vrouter_id);
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proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Priority: %u (%s)", vrh.priority,
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val_to_str(vrh.priority, vrrp_prio_vals, "Non-default backup priority"));
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proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Count IP Addrs: %u", vrh.count_ip_addrs);
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proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Authentication Type: %u (%s)", vrh.auth_type,
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val_to_str(vrh.auth_type, vrrp_auth_vals, "Unknown"));
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proto_tree_add_text(vrrp_tree, NullTVB, offset++, 1, "Advertisement Interval: %u second%s",
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vrh.adver_int, plurality(vrh.adver_int, "", "s"));
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proto_tree_add_text(vrrp_tree, NullTVB, offset, 2, "Checksum: 0x%x", htons(vrh.checksum));
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offset+=2;
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if (short_packet) {
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old_dissect_data(pd, offset, fd, vrrp_tree);
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return;
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}
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ip_count = vrh.count_ip_addrs;
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while (ip_count > 0) {
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proto_tree_add_text(vrrp_tree, NullTVB, offset, 4, "Virtual Router IP address: %s",
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ip_to_str(pd+offset));
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offset+=4;
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ip_count--;
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}
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if (vrh.auth_type != VRRP_AUTH_TYPE_SIMPLE_TEXT)
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return; /* Contents of the authentication data is undefined */
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strncpy(auth_buf, pd+offset, VRRP_AUTH_DATA_LEN);
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auth_buf[VRRP_AUTH_DATA_LEN] = '\0';
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auth_len = strlen(auth_buf);
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if (auth_len > 0)
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proto_tree_add_text(vrrp_tree, NullTVB, offset, auth_len, "Authentication string: `%s'", auth_buf);
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offset+=8;
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}
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return;
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}
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void proto_register_vrrp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_vrrp_ver_type,
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{"VRRP message version and type", "vrrp.typever",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"VRRP version and type"}},
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{ &hf_vrrp_version,
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{"VRRP protocol version", "vrrp.version",
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FT_UINT8, BASE_DEC, NULL, VRRP_VERSION_MASK,
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"VRRP version"}},
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{ &hf_vrrp_type,
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{"VRRP packet type", "vrrp.type",
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FT_UINT8, BASE_DEC, VALS(vrrp_type_vals), VRRP_TYPE_MASK,
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"VRRP type"}}
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};
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static gint *ett[] = {
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&ett_vrrp,
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&ett_vrrp_ver_type
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};
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proto_vrrp = proto_register_protocol("Virtual Router Redundancy Protocol", "vrrp");
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proto_register_field_array(proto_vrrp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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return;
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}
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void
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proto_reg_handoff_vrrp(void)
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{
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old_dissector_add("ip.proto", IP_PROTO_VRRP, dissect_vrrp);
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}
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