Added Heikki Vatiainen's <hessu@cs.tut.fi> VRRP dissector.

svn path=/trunk/; revision=1083

1 files changed, 213 insertions, 0 deletions

diff --git a/packet-vrrp.c b/packet-vrrp.c
new file mode 100644
index 0000000000..83354285f8
--- /dev/null
+++ b/packet-vrrp.c
@@ -0,0 +1,213 @@
+/* packet-vrrp.c
+ * Routines for the Virtual Router Redundancy Protocol (VRRP)
+ * RFC2338
+ *
+ * Heikki Vatiainen <hessu@cs.tut.fi>
+ *
+ * $Id: packet-vrrp.c,v 1.1 1999/11/21 14:43:53 gram Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@unicom.net>
+ * Copyright 1998 Gerald Combs
+ *
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#include <string.h>
+#include <glib.h>
+#include "packet.h"
+
+static gint proto_vrrp = -1;
+static gint ett_vrrp = -1;
+static gint ett_vrrp_ver_type = -1;
+
+static gint hf_vrrp_ver_type = -1;
+static gint hf_vrrp_version = -1;
+static gint hf_vrrp_type = -1;
+
+struct vrrp_header {
+#define VRRP_VERSION_MASK 0xf0
+#define VRRP_TYPE_MASK 0x0f
+        guint8  ver_type;
+        guint8  vrouter_id;
+        guint8  priority;
+        guint8  count_ip_addrs;
+        guint8  auth_type;
+        guint8  adver_int;
+        guint16 checksum;
+        /* One or more IP addresses */
+        /* 8 octets of authentication data */
+#define VRRP_AUTH_DATA_LEN 8
+};
+
+
+#define VRRP_TYPE_ADVERTISEMENT 1
+static const value_string vrrp_type_vals[] = {
+        {VRRP_TYPE_ADVERTISEMENT, "Advertisement"}
+};
+
+#define VRRP_AUTH_TYPE_NONE 0
+#define VRRP_AUTH_TYPE_SIMPLE_TEXT 1
+#define VRRP_AUTH_TYPE_IP_AUTH_HDR 2
+static const value_string vrrp_auth_vals[] = {
+        {VRRP_AUTH_TYPE_NONE,        "No Authentication"},
+        {VRRP_AUTH_TYPE_SIMPLE_TEXT, "Simple Text Authentication"},
+        {VRRP_AUTH_TYPE_IP_AUTH_HDR, "IP Authentication Header"}
+};
+
+#define VRRP_PRIORITY_MASTER_STOPPING 0
+/* Values between 1 and 254 inclusive are for backup VRRP routers */
+#define VRRP_PRIORITY_DEFAULT 100
+#define VRRP_PRIORITY_OWNER 255
+static const value_string vrrp_prio_vals[] = {
+        {VRRP_PRIORITY_MASTER_STOPPING,  "Current Master has stopped participating in VRRP"},
+        {VRRP_PRIORITY_DEFAULT,          "Default priority for a backup VRRP router"},
+        {VRRP_PRIORITY_OWNER,            "This VRRP router owns the virtual router's IP address(es)"}
+};
+
+
+void dissect_vrrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+{
+        struct vrrp_header vrh;
+        gboolean short_hdr = FALSE;
+        gboolean short_packet = FALSE;
+        guint calculated_len = -1; /* initialize to silence false warning from gcc */
+
+        if (sizeof(struct vrrp_header) > END_OF_FRAME)
+                short_hdr = short_packet = TRUE;
+        else {
+                memcpy(&vrh, pd + offset, sizeof(struct vrrp_header));
+                calculated_len = sizeof(struct vrrp_header) + vrh.count_ip_addrs*4 + VRRP_AUTH_DATA_LEN;
+                if (calculated_len > END_OF_FRAME)
+                        short_packet = TRUE;
+        }
+
+        if (check_col(fd, COL_PROTOCOL))
+                col_add_str(fd, COL_PROTOCOL, "VRRP");
+        
+        if (check_col(fd, COL_INFO)) {
+                if (short_hdr)
+                        col_add_fstr(fd, COL_INFO, "Short packet header, length %u", END_OF_FRAME);
+                else if (short_packet)
+                        col_add_fstr(fd, COL_INFO, "Packet length mismatch, calculated %u, real %u",
+                                     calculated_len, END_OF_FRAME);
+                else
+                        col_add_fstr(fd, COL_INFO, "%s (v%u)", "Announcement", hi_nibble(vrh.ver_type));
+        }
+
+        if (tree) {
+                proto_item *ti, *tv;
+                proto_tree *vrrp_tree, *ver_type_tree;
+                guint8 ip_count, auth_len, auth_buf[VRRP_AUTH_DATA_LEN+1];
+
+                if (short_hdr) {
+                        dissect_data(pd, offset, fd, tree);
+                        return;
+                }
+
+                ti = proto_tree_add_item(tree, proto_vrrp, offset, END_OF_FRAME, NULL);
+                vrrp_tree = proto_item_add_subtree(ti, ett_vrrp);
+
+                tv = proto_tree_add_item_format(vrrp_tree, hf_vrrp_ver_type, offset, 1,
+                                                vrh.ver_type, "Version %u, Packet type %u (%s)",
+                                                hi_nibble(vrh.ver_type), lo_nibble(vrh.ver_type),
+                                                val_to_str(lo_nibble(vrh.ver_type), vrrp_type_vals, "Unknown"));
+                ver_type_tree = proto_item_add_subtree(tv, ett_vrrp_ver_type);
+                proto_tree_add_item(ver_type_tree, hf_vrrp_version, offset, 1, vrh.ver_type);
+                proto_tree_add_item(ver_type_tree, hf_vrrp_type, offset, 1, vrh.ver_type);
+                offset++;
+                
+                proto_tree_add_text(vrrp_tree, offset++, 1, "Virtual Router ID: %u", vrh.vrouter_id);
+                proto_tree_add_text(vrrp_tree, offset++, 1, "Priority: %u (%s)", vrh.priority,
+                                    val_to_str(vrh.priority, vrrp_prio_vals, "Non-default backup priority"));
+                proto_tree_add_text(vrrp_tree, offset++, 1, "Count IP Addrs: %u", vrh.count_ip_addrs);
+                proto_tree_add_text(vrrp_tree, offset++, 1, "Authentication Type: %u (%s)", vrh.auth_type,
+                                    val_to_str(vrh.auth_type, vrrp_auth_vals, "Unknown"));
+                proto_tree_add_text(vrrp_tree, offset++, 1, "Advertisement Interval: %u second%s",
+                                    vrh.adver_int, plurality(vrh.adver_int, "", "s"));
+                proto_tree_add_text(vrrp_tree, offset, 2, "Checksum: 0x%x", htons(vrh.checksum));
+                offset+=2;
+
+                if (short_packet) {
+                        dissect_data(pd, offset, fd, vrrp_tree);
+                        return;
+                }
+                
+                ip_count = vrh.count_ip_addrs;
+                while (ip_count > 0) {
+                        proto_tree_add_text(vrrp_tree, offset, 4, "Virtual Router IP address: %s",
+                                            ip_to_str(pd+offset));
+                        offset+=4;
+                        ip_count--;
+                }
+
+                if (vrh.auth_type != VRRP_AUTH_TYPE_SIMPLE_TEXT)
+                        return; /* Contents of the authentication data is undefined */
+
+                strncpy(auth_buf, pd+offset, VRRP_AUTH_DATA_LEN);
+                auth_buf[VRRP_AUTH_DATA_LEN] = '\0';
+                auth_len = strlen(auth_buf);
+                if (auth_len > 0)
+                        proto_tree_add_text(vrrp_tree, offset, auth_len, "Authentication string: `%s'", auth_buf);
+                offset+=8;
+
+        }
+
+        return;
+}
+
+void proto_register_vrrp(void)
+{
+        static hf_register_info hf[] = {
+                { &hf_vrrp_ver_type,
+                  {"VRRP message version and type", "vrrp.typever",
+                   FT_UINT8, BASE_DEC, NULL, 0x0,
+                   "VRRP version and type"}},
+
+                { &hf_vrrp_version,
+                  {"VRRP protocol version", "vrrp.version",
+                   FT_UINT8, BASE_DEC, NULL, VRRP_VERSION_MASK,
+                   "VRRP version"}},
+
+                { &hf_vrrp_type,
+                  {"VRRP packet type", "vrrp.type",
+                   FT_UINT8, BASE_DEC, VALS(vrrp_type_vals), VRRP_TYPE_MASK,
+                   "VRRP type"}}
+        };
+
+        static gint *ett[] = {
+                &ett_vrrp,
+                &ett_vrrp_ver_type
+        };
+
+        proto_vrrp = proto_register_protocol("Virtual Router Redundancy Protocol", "vrrp");
+        proto_register_field_array(proto_vrrp, hf, array_length(hf));
+        proto_register_subtree_array(ett, array_length(ett));
+
+        return;
+}