/* packet-udp.c
* Routines for UDP packet disassembly
*
- * $Id: packet-udp.c,v 1.11 1998/12/29 04:05:36 gerald Exp $
+ * $Id: packet-udp.c,v 1.23 1999/08/18 00:57:54 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
+ * Richard Sharpe, 13-Feb-1999, added dispatch table support and
+ * support for tftp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
# include "config.h"
#endif
-#include <gtk/gtk.h>
-
-#include <stdio.h>
-
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
# include <netinet/in.h>
#endif
-#include "ethereal.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <glib.h>
#include "packet.h"
#include "resolv.h"
+int proto_udp = -1;
+int hf_udp_srcport = -1;
+int hf_udp_dstport = -1;
+int hf_udp_port = -1;
+int hf_udp_length = -1;
+int hf_udp_checksum = -1;
+
+/* UDP structs and definitions */
+
+typedef struct _e_udphdr {
+ guint16 uh_sport;
+ guint16 uh_dport;
+ guint16 uh_ulen;
+ guint16 uh_sum;
+} e_udphdr;
+
+/* UDP Ports -> should go in packet-udp.h */
+
+#define UDP_PORT_DNS 53
+#define UDP_PORT_BOOTPS 67
+#define UDP_PORT_TFTP 69
+#define UDP_PORT_IPX 213
+#define UDP_PORT_NBNS 137
+#define UDP_PORT_NBDGM 138
+#define UDP_PORT_SNMP 161
+#define UDP_PORT_ISAKMP 500
+#define UDP_PORT_RIP 520
+#define UDP_PORT_VINES 573
+#define UDP_PORT_RADIUS 1645
+#define UDP_PORT_RADIUS_NEW 1812
+#define UDP_PORT_RADACCT 1646
+#define UDP_PORT_RADACCT_NEW 1813
+
+
+struct hash_struct {
+ guint16 proto;
+ void (*dissect)(const u_char *, int, frame_data *, proto_tree *);
+ struct hash_struct *next;
+};
+
+static struct hash_struct *hash_table[256];
+
+/*
+ * These routines are for UDP, will be generalized soon: RJS
+ *
+ * XXX - note that they should probably check the IP address as well as
+ * the port number, so that we don't mistakenly identify packets as, say,
+ * TFTP, merely because they have a source or destination port number
+ * equal to the port being used by a TFTP daemon on some machine other
+ * than the one they're going to or from.
+ */
+
+struct hash_struct *udp_find_hash_ent(guint16 proto) {
+
+ int idx = proto % 256;
+ struct hash_struct *hash_ent = hash_table[idx];
+
+ while (hash_ent != NULL) {
+
+ if (hash_ent -> proto == proto)
+ return hash_ent;
+
+ hash_ent = hash_ent -> next;
+
+ }
+
+ return NULL;
+
+}
+
+void udp_hash_add(guint16 proto,
+ void (*dissect)(const u_char *, int, frame_data *, proto_tree *)) {
+
+ int idx = proto % 256; /* Simply take the remainder, hope for no collisions */
+ struct hash_struct *hash_ent = (struct hash_struct *)malloc(sizeof(struct hash_struct));
+ struct hash_struct *hash_ent2;
+
+ hash_ent -> proto = proto;
+ hash_ent -> dissect = dissect;
+ hash_ent -> next = NULL;
+
+ if (hash_ent == NULL) {
+
+ fprintf(stderr, "Could not allocate space for hash structure in dissect_udp\n");
+ exit(1);
+ }
+
+ if (hash_table[idx]) { /* Something, add on end */
+
+ hash_ent2 = hash_table[idx];
+
+ while (hash_ent2 -> next != NULL)
+ hash_ent2 = hash_ent2 -> next;
+
+ hash_ent2 -> next = hash_ent; /* Bad in pathalogical cases */
+
+ }
+ else {
+
+ hash_table[idx] = hash_ent;
+
+ }
+
+}
+
+void init_dissect_udp(void) {
+
+ int i;
+
+ for (i = 0; i < 256; i++) {
+
+ hash_table[i] = NULL;
+
+ }
+
+ /* Now add the protocols we know about */
+
+ udp_hash_add(UDP_PORT_BOOTPS, dissect_bootp);
+ udp_hash_add(UDP_PORT_TFTP, dissect_tftp);
+
+}
+
void
-dissect_udp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
+dissect_udp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
e_udphdr uh;
guint16 uh_sport, uh_dport, uh_ulen, uh_sum;
- GtkWidget *udp_tree, *ti;
+ struct hash_struct *dissect_routine = NULL;
+ proto_tree *udp_tree;
+ proto_item *ti;
/* To do: Check for {cap len,pkt len} < struct len */
/* Avoids alignment problems on many architectures. */
col_add_fstr(fd, COL_UNRES_DST_PORT, "%u", uh_dport);
if (tree) {
- ti = add_item_to_tree(GTK_WIDGET(tree), offset, 8,
- "User Datagram Protocol");
- udp_tree = gtk_tree_new();
- add_subtree(ti, udp_tree, ETT_UDP);
- add_item_to_tree(udp_tree, offset, 2, "Source port: %s (%u)",
- get_udp_port(uh_sport), uh_sport);
- add_item_to_tree(udp_tree, offset + 2, 2, "Destination port: %s (%u)",
- get_udp_port(uh_dport), uh_dport);
- add_item_to_tree(udp_tree, offset + 4, 2, "Length: %u", uh_ulen);
- add_item_to_tree(udp_tree, offset + 6, 2, "Checksum: 0x%04x", uh_sum);
+ ti = proto_tree_add_item(tree, proto_udp, offset, 8);
+ udp_tree = proto_item_add_subtree(ti, ETT_UDP);
+
+ proto_tree_add_item_format(udp_tree, hf_udp_srcport, offset, 2, uh_sport,
+ "Source port: %s (%u)", get_udp_port(uh_sport), uh_sport);
+ proto_tree_add_item_format(udp_tree, hf_udp_dstport, offset + 2, 2, uh_dport,
+ "Destination port: %s (%u)", get_udp_port(uh_dport), uh_dport);
+
+ proto_tree_add_item_hidden(udp_tree, hf_udp_port, offset, 2, uh_sport);
+ proto_tree_add_item_hidden(udp_tree, hf_udp_port, offset+2, 2, uh_dport);
+
+ proto_tree_add_item(udp_tree, hf_udp_length, offset + 4, 2, uh_ulen);
+ proto_tree_add_item_format(udp_tree, hf_udp_checksum, offset + 6, 2, uh_sum,
+ "Checksum: 0x%04x", uh_sum);
}
/* Skip over header */
offset += 8;
- /* To do: make sure we aren't screwing ourselves with the MIN call. */
- switch (MIN(uh_sport, uh_dport)) {
- case UDP_PORT_BOOTPS:
+ /* XXX - we should do all of this through the table of ports. */
+#define PORT_IS(port) (uh_sport == port || uh_dport == port)
+ if (PORT_IS(UDP_PORT_BOOTPS))
dissect_bootp(pd, offset, fd, tree);
- break;
- case UDP_PORT_DNS:
+ else if (PORT_IS(UDP_PORT_DNS))
dissect_dns(pd, offset, fd, tree);
- break;
- case UDP_PORT_RIP:
+ else if (PORT_IS(UDP_PORT_ISAKMP))
+ dissect_isakmp(pd, offset, fd, tree);
+ else if (PORT_IS(UDP_PORT_RIP)) {
/* we should check the source port too (RIP: UDP src and dst port 520) */
dissect_rip(pd, offset, fd, tree);
- break;
- case UDP_PORT_NBNS:
- dissect_nbns(pd, offset, fd, tree);
- break;
- case UDP_PORT_NBDGM:
- dissect_nbdgm(pd, offset, fd, tree);
- break;
- case UDP_PORT_IPX: /* RFC 1234 */
+ } else if (PORT_IS(UDP_PORT_NBNS))
+ dissect_nbns(pd, offset, fd, tree);
+ else if (PORT_IS(UDP_PORT_NBDGM))
+ dissect_nbdgm(pd, offset, fd, tree);
+ else if (PORT_IS(UDP_PORT_IPX)) /* RFC 1234 */
dissect_ipx(pd, offset, fd, tree);
- break;
- case UDP_PORT_VINES:
+#if defined(HAVE_UCD_SNMP_SNMP_H) || defined(HAVE_SNMP_SNMP_H)
+ else if (PORT_IS(UDP_PORT_SNMP))
+ dissect_snmp(pd, offset, fd, tree);
+#endif
+ else if (PORT_IS(UDP_PORT_VINES)) {
/* FIXME: AFAIK, src and dst port must be the same */
dissect_vines_frp(pd, offset, fd, tree);
- break;
- default:
- dissect_data(pd, offset, fd, tree);
+ } else if (PORT_IS(UDP_PORT_TFTP)) {
+ /* This is the first point of call, but it adds a dynamic call */
+ udp_hash_add(MAX(uh_sport, uh_dport), dissect_tftp); /* Add to table */
+ dissect_tftp(pd, offset, fd, tree);
+ } else if (PORT_IS(UDP_PORT_RADIUS) ||
+ PORT_IS(UDP_PORT_RADACCT) ||
+ PORT_IS(UDP_PORT_RADIUS_NEW) ||
+ PORT_IS(UDP_PORT_RADACCT_NEW) ) {
+ dissect_radius(pd, offset, fd, tree);
+ } else {
+ /* OK, find a routine in the table, else use the default */
+
+ if ((dissect_routine = udp_find_hash_ent(uh_sport))) {
+
+ struct hash_struct *dr2 = udp_find_hash_ent(uh_dport);
+
+ if (dr2 == NULL) { /* Not in the table, add */
+
+ udp_hash_add(uh_dport, dissect_tftp);
+
+ }
+
+ dissect_routine -> dissect(pd, offset, fd, tree);
+ }
+ else if ((dissect_routine = udp_find_hash_ent(uh_dport))) {
+
+ dissect_routine -> dissect(pd, offset, fd, tree);
+
+ }
+ else {
+
+ dissect_data(pd, offset, fd, tree);
+ }
}
}
+
+void
+proto_register_udp(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_udp_srcport,
+ { "Source Port", "udp.srcport", FT_UINT16, NULL }},
+
+ { &hf_udp_dstport,
+ { "Destination Port", "udp.dstport", FT_UINT16, NULL }},
+
+ { &hf_udp_port,
+ { "Source or Destination Port", "udp.port", FT_UINT16, NULL }},
+
+ { &hf_udp_length,
+ { "Length", "udp.length", FT_UINT16, NULL }},
+
+ { &hf_udp_checksum,
+ { "Checksum", "udp.checksum", FT_UINT16, NULL }}
+ };
+
+ proto_udp = proto_register_protocol("User Datagram Protocol", "udp");
+ proto_register_field_array(proto_udp, hf, array_length(hf));
+}
+
git.samba.org / obnox / wireshark / wip.git / blobdiff