/* packet-hsrp.c
* Routines for the Cisco Hot Standby Router Protocol (HSRP)
- * RFC2281
+ * RFC 2281
*
* Heikki Vatiainen <hessu@cs.tut.fi>
*
- * $Id: packet-hsrp.c,v 1.7 2000/08/13 14:08:12 deniel Exp $
+ * $Id: packet-hsrp.c,v 1.14 2001/01/03 16:41:06 gram Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
#include <netinet/in.h>
#endif
+#include <string.h>
#include <glib.h>
#include "packet.h"
static gint proto_hsrp = -1;
+
+static gint hf_hsrp_version = -1;
+static gint hf_hsrp_opcode = -1;
+static gint hf_hsrp_state = -1;
+static gint hf_hsrp_hellotime = -1;
+static gint hf_hsrp_holdtime = -1;
+static gint hf_hsrp_priority = -1;
+static gint hf_hsrp_group = -1;
+static gint hf_hsrp_reserved = -1;
+static gint hf_hsrp_auth_data = -1;
+static gint hf_hsrp_virt_ip_addr = -1;
+
static gint ett_hsrp = -1;
#define UDP_PORT_HSRP 1985
static const value_string hsrp_opcode_vals[] = {
{HSRP_OPCODE_HELLO, "Hello"},
{HSRP_OPCODE_COUP, "Coup"},
- {HSRP_OPCODE_RESIGN, "Resign"}
+ {HSRP_OPCODE_RESIGN, "Resign"},
+ {0, NULL},
};
#define HSRP_STATE_INITIAL 0
{HSRP_STATE_LISTEN, "Listen"},
{HSRP_STATE_SPEAK, "Speak"},
{HSRP_STATE_STANDBY, "Standby"},
- {HSRP_STATE_ACTIVE, "Active"}
+ {HSRP_STATE_ACTIVE, "Active"},
+ {0, NULL},
};
static void
-dissect_hsrp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
+dissect_hsrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
- struct hsrp_packet hsrp;
- gboolean short_packet = FALSE;
+ guint8 opcode, state;
- OLD_CHECK_DISPLAY_AS_DATA(proto_hsrp, pd, offset, fd, tree);
+ CHECK_DISPLAY_AS_DATA(proto_hsrp, tvb, pinfo, tree);
- if (sizeof(struct hsrp_packet) > END_OF_FRAME)
- short_packet = TRUE;
- else
- memcpy(&hsrp, pd + offset, sizeof(struct hsrp_packet));
+ pinfo->current_proto = "HSRP";
- if (check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "HSRP");
+ if (check_col(pinfo->fd, COL_PROTOCOL))
+ col_set_str(pinfo->fd, COL_PROTOCOL, "HSRP");
- if (check_col(fd, COL_INFO)) {
- if (short_packet)
- col_add_fstr(fd, COL_INFO, "Short packet, length %u", END_OF_FRAME);
- else
- col_add_fstr(fd, COL_INFO, "%s (state %s)",
- val_to_str(hsrp.opcode, hsrp_opcode_vals, "Unknown"),
- val_to_str(hsrp.state, hsrp_state_vals, "Unknown"));
+ opcode = tvb_get_guint8(tvb, 1);
+ state = tvb_get_guint8(tvb, 2);
+ if (check_col(pinfo->fd, COL_INFO)) {
+ col_add_fstr(pinfo->fd, COL_INFO, "%s (state %s)",
+ val_to_str(opcode, hsrp_opcode_vals, "Unknown"),
+ val_to_str(state, hsrp_state_vals, "Unknown"));
}
if (tree) {
proto_item *ti;
proto_tree *hsrp_tree;
- guint8 auth_buf[sizeof(hsrp.auth_data) + 1];
+ int offset;
+ guint8 hellotime, holdtime;
+ guint8 auth_buf[8 + 1];
+ guint32 virt_ip_addr;
- if (short_packet) {
- old_dissect_data(pd, offset, fd, tree);
- return;
- }
-
- ti = proto_tree_add_item(tree, proto_hsrp, NullTVB, offset, END_OF_FRAME, FALSE);
+ offset = 0;
+ ti = proto_tree_add_item(tree, proto_hsrp, tvb, offset, tvb_length(tvb), FALSE);
hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Version: %u", hsrp.version);
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Opcode: %u (%s)", hsrp.opcode,
- val_to_str(hsrp.opcode, hsrp_opcode_vals, "Unknown"));
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "State: %u (%s)", hsrp.state,
- val_to_str(hsrp.state, hsrp_state_vals, "Unknown"));
-
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Hellotime: %u second%s (%sdefault)",
- hsrp.hellotime, plurality(hsrp.hellotime, "", "s"),
- (hsrp.hellotime == HSRP_DEFAULT_HELLOTIME) ? "" : "non-");
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Holdtime: %u second%s (%sdefault)",
- hsrp.holdtime, plurality(hsrp.holdtime, "", "s"),
- (hsrp.holdtime == HSRP_DEFAULT_HOLDTIME) ? "" : "non-");
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Priority: %u", hsrp.priority);
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Group: %u", hsrp.group);
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 1, "Reserved: 0x%x", hsrp.reserved);
-
- memcpy(auth_buf, hsrp.auth_data, sizeof(hsrp.auth_data));
- auth_buf[sizeof(auth_buf)] = '\0';
- proto_tree_add_text(hsrp_tree, NullTVB, offset, 8, "Authentication Data: `%s'", auth_buf);
- offset+=8;
-
- proto_tree_add_text(hsrp_tree, NullTVB, offset++, 4, "Virtual IP address: %s",
- ip_to_str((guint8 *)&hsrp.virt_ip_addr));
+ proto_tree_add_uint(hsrp_tree, hf_hsrp_version, tvb, offset, 1, tvb_get_guint8(tvb, offset));
+ offset++;
+ proto_tree_add_uint(hsrp_tree, hf_hsrp_opcode, tvb, offset, 1, opcode);
+ offset++;
+ proto_tree_add_uint(hsrp_tree, hf_hsrp_state, tvb, offset, 1, state);
+ offset++;
+ hellotime = tvb_get_guint8(tvb, offset);
+ proto_tree_add_uint_format(hsrp_tree, hf_hsrp_hellotime, tvb, offset, 1, hellotime,
+ "Hellotime: %sDefault (%u)",
+ (hellotime == HSRP_DEFAULT_HELLOTIME) ? "" : "Non-",
+ hellotime);
+ offset++;
+ holdtime = tvb_get_guint8(tvb, offset);
+ proto_tree_add_uint_format(hsrp_tree, hf_hsrp_holdtime, tvb, offset, 1, holdtime,
+ "Holdtime: %sDefault (%u)",
+ (holdtime == HSRP_DEFAULT_HOLDTIME) ? "" : "Non-",
+ holdtime);
+ offset++;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_priority, tvb, offset, 1, tvb_get_guint8(tvb, offset));
+ offset++;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_group, tvb, offset, 1, tvb_get_guint8(tvb, offset));
+ offset++;
+ proto_tree_add_item(hsrp_tree, hf_hsrp_reserved, tvb, offset, 1, tvb_get_guint8(tvb, offset));
+ offset++;
+ tvb_memcpy(tvb, auth_buf, offset, 8);
+ auth_buf[sizeof auth_buf - 1] = '\0';
+ proto_tree_add_string_format(hsrp_tree, hf_hsrp_auth_data, tvb, offset, 8, auth_buf,
+ "Authentication Data: %sDefault (%s)",
+ (tvb_strneql(tvb, offset, "cisco", strlen("cisco"))) == 0 ? "" : "Non-",
+ auth_buf);
+ offset += 8;
+ tvb_memcpy(tvb, (guint8 *)&virt_ip_addr, offset, 4);
+ proto_tree_add_ipv4(hsrp_tree, hf_hsrp_virt_ip_addr, tvb, offset, 4, virt_ip_addr);
+ offset += 4;
}
void proto_register_hsrp(void)
{
+ static hf_register_info hf[] = {
+ { &hf_hsrp_version,
+ { "Version", "hsrp.version",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "The version of the HSRP messages"}},
+
+ { &hf_hsrp_opcode,
+ { "Op Code", "hsrp.opcode",
+ FT_UINT8, BASE_DEC, VALS(hsrp_opcode_vals), 0x0,
+ "The type of message contained in this packet" }},
+
+ { &hf_hsrp_state,
+ { "State", "hsrp.state",
+ FT_UINT8, BASE_DEC, VALS(hsrp_state_vals), 0x0,
+ "The current state of the router sending the message" }},
+
+ { &hf_hsrp_hellotime,
+ { "Hellotime", "hsrp.hellotime",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "The approximate period between the Hello messages that the router sends" }},
+
+ { &hf_hsrp_holdtime,
+ { "Holdtime", "hsrp.holdtime",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "Time that the current Hello message should be considered valid" }},
+
+ { &hf_hsrp_priority,
+ { "Priority", "hsrp.priority",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "Used to elect the active and standby routers. Numerically higher priority wins vote" }},
+
+ { &hf_hsrp_group,
+ { "Group", "hsrp.group",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "This field identifies the standby group" }},
+
+ { &hf_hsrp_reserved,
+ { "Reserved", "hsrp.reserved",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ "Reserved" }},
+
+ { &hf_hsrp_auth_data,
+ { "Authentication Data", "hsrp.auth_data",
+ FT_STRING, 0, NULL, 0x0,
+ "Contains a clear-text 8 character reused password" }},
+
+ { &hf_hsrp_virt_ip_addr,
+ { "Virtual IP Address", "hsrp.virt_ip",
+ FT_IPv4, 0, NULL, 0x0,
+ "The virtual IP address used by this group" }},
+
+ };
+
static gint *ett[] = {
&ett_hsrp,
};
- proto_hsrp = proto_register_protocol("Cisco Hot Standby Router Protocol", "hsrp");
+ proto_hsrp = proto_register_protocol("Cisco Hot Standby Router Protocol",
+ "HSRP", "hsrp");
+ proto_register_field_array(proto_hsrp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
return;
void
proto_reg_handoff_hsrp(void)
{
- old_dissector_add("udp.port", UDP_PORT_HSRP, dissect_hsrp);
+ dissector_add("udp.port", UDP_PORT_HSRP, dissect_hsrp);
}
git.samba.org / obnox / wireshark / wip.git / blobdiff