/* packet-udp.c
* Routines for UDP packet disassembly
*
- * $Id: packet-udp.c,v 1.8 1998/11/17 05:04:04 gerald Exp $
+ * $Id: packet-udp.c,v 1.85 2001/01/11 16:27:23 gram 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 "packet.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <glib.h>
+#include "globals.h"
#include "resolv.h"
+#include "in_cksum.h"
+
+#include "plugins.h"
+#include "packet-udp.h"
+
+#include "packet-ip.h"
+#include "conversation.h"
+#include "packet-vines.h"
+
+static int proto_udp = -1;
+static int hf_udp_srcport = -1;
+static int hf_udp_dstport = -1;
+static int hf_udp_port = -1;
+static int hf_udp_length = -1;
+static int hf_udp_checksum = -1;
+
+static gint ett_udp = -1;
+
+/* UDP structs and definitions */
+
+typedef struct _e_udphdr {
+ guint16 uh_sport;
+ guint16 uh_dport;
+ guint16 uh_ulen;
+ guint16 uh_sum;
+} e_udphdr;
+
+static dissector_table_t udp_dissector_table;
+static heur_dissector_list_t heur_subdissector_list;
+static conv_dissector_list_t conv_subdissector_list;
+
+/* Determine if there is a sub-dissector and call it. This has been */
+/* separated into a stand alone routine to other protocol dissectors */
+/* can call to it, ie. socks */
void
-dissect_udp(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
+decode_udp_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,
+ proto_tree *tree, int uh_sport, int uh_dport)
+{
+ tvbuff_t *next_tvb;
+#ifdef HAVE_PLUGINS
+ const u_char *next_pd;
+ int next_offset;
+#endif
+
+ next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+
+/* determine if this packet is part of a conversation and call dissector */
+/* for the conversation if available */
+
+ if (try_conversation_dissector(&pinfo->src, &pinfo->dst, PT_UDP,
+ uh_sport, uh_dport, next_tvb, pinfo, tree))
+ return;
+
+ /* try to apply the plugins */
+#ifdef HAVE_PLUGINS
+ {
+ plugin *pt_plug = plugin_list;
+
+ if (enabled_plugins_number > 0) {
+ tvb_compat(next_tvb, &next_pd, &next_offset);
+ while (pt_plug) {
+ if (pt_plug->enabled && strstr(pt_plug->protocol, "udp") &&
+ tree && dfilter_apply(pt_plug->filter, tree, next_pd, pinfo->fd->cap_len)) {
+ pt_plug->dissector(next_pd, next_offset, pinfo->fd, tree);
+ return;
+ }
+ pt_plug = pt_plug->next;
+ }
+ }
+ }
+#endif
+
+ /* do lookup with the subdissector table */
+ if (dissector_try_port(udp_dissector_table, uh_sport, next_tvb, pinfo, tree) ||
+ dissector_try_port(udp_dissector_table, uh_dport, next_tvb, pinfo, tree))
+ return;
+
+ /* do lookup with the heuristic subdissector table */
+ if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo, tree))
+ return;
+
+ dissect_data(next_tvb, 0, pinfo, tree);
+}
+
+
+static void
+dissect_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
e_udphdr uh;
guint16 uh_sport, uh_dport, uh_ulen, uh_sum;
- GtkWidget *udp_tree, *ti;
+ proto_tree *udp_tree;
+ proto_item *ti;
+ guint len;
+ guint reported_len;
+ vec_t cksum_vec[4];
+ guint32 phdr[2];
+ guint16 computed_cksum;
+ int offset = 0;
+
+ CHECK_DISPLAY_AS_DATA(proto_udp, tvb, pinfo, tree);
+
+ pinfo->current_proto = "UDP";
- /* To do: Check for {cap len,pkt len} < struct len */
/* Avoids alignment problems on many architectures. */
- memcpy(&uh, &pd[offset], sizeof(e_udphdr));
+ tvb_memcpy(tvb, (guint8 *)&uh, offset, sizeof(e_udphdr));
uh_sport = ntohs(uh.uh_sport);
uh_dport = ntohs(uh.uh_dport);
uh_ulen = ntohs(uh.uh_ulen);
uh_sum = ntohs(uh.uh_sum);
- if (check_col(fd, COL_PROTOCOL))
- col_add_str(fd, COL_PROTOCOL, "UDP");
- if (check_col(fd, COL_INFO))
- col_add_fstr(fd, COL_INFO, "Source port: %s Destination port: %s",
+ if (check_col(pinfo->fd, COL_PROTOCOL))
+ col_set_str(pinfo->fd, COL_PROTOCOL, "UDP");
+ if (check_col(pinfo->fd, COL_INFO))
+ col_add_fstr(pinfo->fd, COL_INFO, "Source port: %s Destination port: %s",
get_udp_port(uh_sport), get_udp_port(uh_dport));
- if (check_col(fd, COL_RES_SRC_PORT))
- col_add_str(fd, COL_RES_SRC_PORT, get_udp_port(uh_sport));
- if (check_col(fd, COL_UNRES_SRC_PORT))
- col_add_fstr(fd, COL_UNRES_SRC_PORT, "%d", uh_sport);
- if (check_col(fd, COL_RES_DST_PORT))
- col_add_str(fd, COL_RES_DST_PORT, get_udp_port(uh_dport));
- if (check_col(fd, COL_UNRES_DST_PORT))
- col_add_fstr(fd, COL_UNRES_DST_PORT, "%d", 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", get_udp_port(uh_sport));
- add_item_to_tree(udp_tree, offset + 2, 2, "Destination port: %s", get_udp_port(uh_dport));
- add_item_to_tree(udp_tree, offset + 4, 2, "Length: %d", uh_ulen);
- add_item_to_tree(udp_tree, offset + 6, 2, "Checksum: 0x%04x", uh_sum);
+ ti = proto_tree_add_item(tree, proto_udp, tvb, offset, 8, FALSE);
+ udp_tree = proto_item_add_subtree(ti, ett_udp);
+
+ proto_tree_add_uint_format(udp_tree, hf_udp_srcport, tvb, offset, 2, uh_sport,
+ "Source port: %s (%u)", get_udp_port(uh_sport), uh_sport);
+ proto_tree_add_uint_format(udp_tree, hf_udp_dstport, tvb, offset + 2, 2, uh_dport,
+ "Destination port: %s (%u)", get_udp_port(uh_dport), uh_dport);
+
+ proto_tree_add_uint_hidden(udp_tree, hf_udp_port, tvb, offset, 2, uh_sport);
+ proto_tree_add_uint_hidden(udp_tree, hf_udp_port, tvb, offset+2, 2, uh_dport);
+
+ proto_tree_add_uint(udp_tree, hf_udp_length, tvb, offset + 4, 2, uh_ulen);
+ reported_len = tvb_reported_length(tvb);
+ len = tvb_length(tvb);
+ if (uh_sum == 0) {
+ /* No checksum supplied in the packet. */
+ proto_tree_add_uint_format(udp_tree, hf_udp_checksum, tvb,
+ offset + 6, 2, uh_sum, "Checksum: 0x%04x (none)", uh_sum);
+ } else if (!pinfo->fragmented && len >= reported_len) {
+ /* The packet isn't part of a fragmented datagram and isn't
+ truncated, so we can checksum it.
+ XXX - make a bigger scatter-gather list once we do fragment
+ reassembly? */
+
+ /* Set up the fields of the pseudo-header. */
+ cksum_vec[0].ptr = pinfo->src.data;
+ cksum_vec[0].len = pinfo->src.len;
+ cksum_vec[1].ptr = pinfo->dst.data;
+ cksum_vec[1].len = pinfo->dst.len;
+ cksum_vec[2].ptr = (const guint8 *)&phdr;
+ switch (pinfo->src.type) {
+
+ case AT_IPv4:
+ phdr[0] = htonl((IP_PROTO_UDP<<16) + reported_len);
+ cksum_vec[2].len = 4;
+ break;
+
+ case AT_IPv6:
+ phdr[0] = htonl(reported_len);
+ phdr[1] = htonl(IP_PROTO_UDP);
+ cksum_vec[2].len = 8;
+ break;
+
+ default:
+ /* TCP runs only atop IPv4 and IPv6.... */
+ g_assert_not_reached();
+ break;
+ }
+ cksum_vec[3].ptr = tvb_get_ptr(tvb, offset, len);
+ cksum_vec[3].len = reported_len;
+ computed_cksum = in_cksum(&cksum_vec[0], 4);
+ if (computed_cksum == 0) {
+ proto_tree_add_uint_format(udp_tree, hf_udp_checksum, tvb,
+ offset + 6, 2, uh_sum, "Checksum: 0x%04x (correct)", uh_sum);
+ } else {
+ proto_tree_add_uint_format(udp_tree, hf_udp_checksum, tvb,
+ offset + 6, 2, uh_sum,
+ "Checksum: 0x%04x (incorrect, should be 0x%04x)", uh_sum,
+ in_cksum_shouldbe(uh_sum, computed_cksum));
+ }
+ } else {
+ proto_tree_add_uint_format(udp_tree, hf_udp_checksum, tvb,
+ 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:
- dissect_bootp(pd, offset, fd, tree);
- break;
- case UDP_PORT_DNS:
- dissect_dns(pd, offset, fd, tree);
- break;
- case 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_IPX: /* RFC 1234 */
- dissect_ipx(pd, offset, fd, tree);
- break;
- default:
- dissect_data(pd, offset, fd, tree);
- }
+ pinfo->ptype = PT_UDP;
+ pinfo->srcport = uh_sport;
+ pinfo->destport = uh_dport;
+
+/* call sub-dissectors */
+ decode_udp_ports( tvb, offset, pinfo, tree, uh_sport, uh_dport);
+
+}
+
+void
+proto_register_udp(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_udp_srcport,
+ { "Source Port", "udp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "" }},
+
+ { &hf_udp_dstport,
+ { "Destination Port", "udp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "" }},
+
+ { &hf_udp_port,
+ { "Source or Destination Port", "udp.port", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "" }},
+
+ { &hf_udp_length,
+ { "Length", "udp.length", FT_UINT16, BASE_DEC, NULL, 0x0,
+ "" }},
+
+ { &hf_udp_checksum,
+ { "Checksum", "udp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0,
+ "" }},
+ };
+ static gint *ett[] = {
+ &ett_udp,
+ };
+
+ proto_udp = proto_register_protocol("User Datagram Protocol",
+ "UDP", "udp");
+ proto_register_field_array(proto_udp, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+/* subdissector code */
+ udp_dissector_table = register_dissector_table("udp.port");
+ register_heur_dissector_list("udp", &heur_subdissector_list);
+ register_conv_dissector_list("udp", &conv_subdissector_list);
+}
+
+void
+proto_reg_handoff_udp(void)
+{
+ dissector_add("ip.proto", IP_PROTO_UDP, dissect_udp, proto_udp);
}
git.samba.org / obnox / wireshark / wip.git / blobdiff