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-rw-r--r--epan/dissectors/packet-sap.c362
1 files changed, 362 insertions, 0 deletions
diff --git a/epan/dissectors/packet-sap.c b/epan/dissectors/packet-sap.c
new file mode 100644
index 0000000000..c54ad1ecd8
--- /dev/null
+++ b/epan/dissectors/packet-sap.c
@@ -0,0 +1,362 @@
+/* packet-sap.c
+ * Routines for sap packet dissection
+ * RFC 2974
+ *
+ * Heikki Vatiainen <hessu@cs.tut.fi>
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * Copied from packet-tftp.c
+ *
+ * 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
+
+#include <string.h>
+#include <glib.h>
+#include <epan/packet.h>
+#include "packet-ipv6.h"
+
+#define UDP_PORT_SAP 9875
+
+#define MCAST_SAP_VERSION_MASK 0xE0 /* 3 bits for SAP version*/
+#define MCAST_SAP_VERSION_SHIFT 5 /* Right shift 5 bits to get the version */
+#define MCAST_SAP_VER0 0 /* Version 0 */
+#define MCAST_SAP_VER1PLUS 1 /* Version 1 or later */
+static const value_string mcast_sap_ver[] = {
+ { MCAST_SAP_VER0, "SAPv0"},
+ { MCAST_SAP_VER1PLUS, "SAPv1 or later"},
+ { 0, NULL} };
+
+static const true_false_string mcast_sap_address_type = {
+ "IPv6",
+ "IPv4"
+};
+
+static const true_false_string mcast_sap_message_type = {
+ "Deletion",
+ "Announcement"
+};
+
+static const true_false_string mcast_sap_crypt_type = {
+ "Payload encrypted",
+ "Payload not encrypted "
+};
+
+static const true_false_string mcast_sap_comp_type = {
+ "Payload compressed",
+ "Payload not compressed"
+};
+
+static const value_string mcast_sap_auth_ver[] = {
+ { 1, "SAP authentication header v1"},
+ { 0, NULL} };
+
+static const true_false_string mcast_sap_auth_pad = {
+ "Authentication subheader padded to 32 bits",
+ "No padding required for the authentication subheader"
+};
+
+#define MCAST_SAP_AUTH_TYPE_MASK 0x0F /* 4 bits for the type of the authentication header */
+#define MCAST_SAP_AUTH_TYPE_PGP 0
+#define MCAST_SAP_AUTH_TYPE_CMS 1
+static const value_string mcast_sap_auth_type[] = {
+ { MCAST_SAP_AUTH_TYPE_PGP, "PGP"},
+ { MCAST_SAP_AUTH_TYPE_CMS, "CMS"},
+ { 0, NULL} };
+
+#define MCAST_SAP_BIT_A 0x10 /* Address type: 0 IPv4, 1 IPv6 */
+#define MCAST_SAP_BIT_R 0x08 /* Reserved: Must be 0 */
+#define MCAST_SAP_BIT_T 0x04 /* Message Type: 0 announcement, 1 deletion */
+#define MCAST_SAP_BIT_E 0x02 /* Encryption Bit: 1 payload encrypted */
+#define MCAST_SAP_BIT_C 0x01 /* Compressed Bit: 1 payload zlib compressed */
+
+#define MCAST_SAP_AUTH_BIT_P 0x10 /* Padding required for the authentication header */
+
+
+static int proto_sap = -1;
+static int hf_sap_flags = -1;
+static int hf_sap_flags_v = -1;
+static int hf_sap_flags_a = -1;
+static int hf_sap_flags_r = -1;
+static int hf_sap_flags_t = -1;
+static int hf_sap_flags_e = -1;
+static int hf_sap_flags_c = -1;
+static int hf_auth_data = -1;
+static int hf_auth_flags = -1;
+static int hf_auth_flags_v = -1;
+static int hf_auth_flags_p = -1;
+static int hf_auth_flags_t = -1;
+
+static gint ett_sap = -1;
+static gint ett_sap_flags = -1;
+static gint ett_sap_auth = -1;
+static gint ett_sap_authf = -1;
+
+static dissector_handle_t sdp_handle;
+
+static void
+dissect_sap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ int offset = 0;
+ int sap_version, is_ipv6, is_del, is_enc, is_comp, addr_len;
+ guint8 vers_flags;
+ guint8 auth_len;
+ guint16 tmp1;
+ const guint8 *addr;
+ guint8 auth_flags;
+ tvbuff_t *next_tvb;
+
+ proto_item *si, *sif;
+ proto_tree *sap_tree, *sap_flags_tree;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "SAP");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ vers_flags = tvb_get_guint8(tvb, offset);
+ is_ipv6 = vers_flags&MCAST_SAP_BIT_A;
+ is_del = vers_flags&MCAST_SAP_BIT_T;
+ is_enc = vers_flags&MCAST_SAP_BIT_E;
+ is_comp = vers_flags&MCAST_SAP_BIT_C;
+
+ sap_version = (vers_flags&MCAST_SAP_VERSION_MASK)>>MCAST_SAP_VERSION_SHIFT;
+ addr_len = (is_ipv6) ? sizeof(struct e_in6_addr) : 4;
+
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s (v%u)",
+ (is_del) ? "Deletion" : "Announcement", sap_version);
+ }
+
+ if (tree) {
+ si = proto_tree_add_item(tree, proto_sap, tvb, offset, -1, FALSE);
+ sap_tree = proto_item_add_subtree(si, ett_sap);
+
+ sif = proto_tree_add_uint(sap_tree, hf_sap_flags, tvb, offset, 1, vers_flags);
+ sap_flags_tree = proto_item_add_subtree(sif, ett_sap_flags);
+ proto_tree_add_uint(sap_flags_tree, hf_sap_flags_v, tvb, offset, 1, vers_flags);
+ proto_tree_add_boolean(sap_flags_tree, hf_sap_flags_a, tvb, offset, 1, vers_flags);
+ proto_tree_add_boolean(sap_flags_tree, hf_sap_flags_r, tvb, offset, 1, vers_flags);
+ proto_tree_add_boolean(sap_flags_tree, hf_sap_flags_t, tvb, offset, 1, vers_flags);
+ proto_tree_add_boolean(sap_flags_tree, hf_sap_flags_e, tvb, offset, 1, vers_flags);
+ proto_tree_add_boolean(sap_flags_tree, hf_sap_flags_c, tvb, offset, 1, vers_flags);
+ offset++;
+
+ auth_len = tvb_get_guint8(tvb, offset);
+ proto_tree_add_text(sap_tree, tvb, offset, 1, "Authentication Length: %u", auth_len);
+ offset++;
+
+ tmp1 = tvb_get_ntohs(tvb, offset);
+ proto_tree_add_text(sap_tree, tvb, offset, 2, "Message Identifier Hash: 0x%x", tmp1);
+ offset +=2;
+
+ addr = tvb_get_ptr(tvb, offset, addr_len);
+ proto_tree_add_text(sap_tree, tvb, offset, addr_len, "Originating Source: %s",
+ (is_ipv6) ? ip6_to_str((const struct e_in6_addr*)addr) : ip_to_str(addr));
+ offset += addr_len;
+
+ /* Authentication data lives in its own subtree */
+ if (auth_len > 0) {
+ guint32 auth_data_len;
+ proto_item *sdi, *sai;
+ proto_tree *sa_tree, *saf_tree;
+ int has_pad;
+ guint8 pad_len = 0;
+
+ auth_data_len = auth_len * sizeof(guint32);
+
+ sdi = proto_tree_add_item(sap_tree, hf_auth_data, tvb, offset, auth_data_len, FALSE);
+ sa_tree = proto_item_add_subtree(sdi, ett_sap_auth);
+
+ auth_flags = tvb_get_guint8(tvb, offset);
+ sai = proto_tree_add_uint(sa_tree, hf_auth_flags, tvb, offset, 1, auth_flags);
+ saf_tree = proto_item_add_subtree(sai, ett_sap_authf);
+ proto_tree_add_uint(saf_tree, hf_auth_flags_v, tvb, offset, 1, auth_flags);
+ proto_tree_add_boolean(saf_tree, hf_auth_flags_p, tvb, offset, 1, auth_flags);
+ proto_tree_add_uint(saf_tree, hf_auth_flags_t, tvb, offset, 1, auth_flags);
+
+ has_pad = auth_flags&MCAST_SAP_AUTH_BIT_P;
+ if (has_pad)
+ pad_len = tvb_get_guint8(tvb, offset+auth_data_len-1);
+
+ proto_tree_add_text(sa_tree, tvb, offset+1, auth_data_len-pad_len-1,
+ "Authentication subheader: (%u byte%s)",
+ auth_data_len-1, plurality(auth_data_len-1, "", "s"));
+ if (has_pad) {
+ proto_tree_add_text(sa_tree, tvb, offset+auth_data_len-pad_len, pad_len,
+ "Authentication data padding: (%u byte%s)",
+ pad_len, plurality(pad_len, "", "s"));
+ proto_tree_add_text(sa_tree, tvb, offset+auth_data_len-1, 1,
+ "Authentication data pad count: %u byte%s",
+ pad_len, plurality(pad_len, "", "s"));
+ }
+
+ offset += auth_data_len;
+ }
+ if (is_enc || is_comp) {
+ char *mangle;
+ if (is_enc && is_comp) mangle = "compressed and encrypted";
+ else if (is_enc) mangle = "encrypted";
+ else mangle = "compressed";
+ proto_tree_add_text(sap_tree, tvb, offset, -1,
+ "The rest of the packet is %s", mangle);
+ return;
+ }
+
+ /* Do we have the optional payload type aka. MIME content specifier */
+ if (tvb_strneql(tvb, offset, "v=", strlen("v="))) {
+ gint remaining_len;
+ guint32 pt_len;
+ int pt_string_len;
+
+ remaining_len = tvb_length_remaining(tvb, offset);
+ if (remaining_len == 0) {
+ /*
+ * "tvb_strneql()" failed because there was no
+ * data left in the packet.
+ *
+ * Set the remaining length to 1, so that
+ * we throw the appropriate exception in
+ * "tvb_get_ptr()", rather than displaying
+ * the payload type.
+ */
+ remaining_len = 1;
+ }
+ pt_string_len = tvb_strnlen(tvb, offset, remaining_len);
+ if (pt_string_len == -1) {
+ /*
+ * We didn't find a terminating '\0'; run to the
+ * end of the buffer.
+ */
+ pt_string_len = remaining_len;
+ pt_len = pt_string_len;
+ } else {
+ /*
+ * Include the '\0' in the total item length.
+ */
+ pt_len = pt_string_len + 1;
+ }
+ proto_tree_add_text(sap_tree, tvb, offset, pt_len,
+ "Payload type: %.*s", pt_string_len,
+ tvb_get_ptr(tvb, offset, pt_string_len));
+ offset += pt_len;
+ }
+ }
+
+ /* Done with SAP */
+ next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+ call_dissector(sdp_handle, next_tvb, pinfo, tree);
+
+ return;
+}
+
+void proto_register_sap(void)
+{
+
+ static hf_register_info hf[] = {
+ { &hf_sap_flags,
+ { "Flags", "sap.flags",
+ FT_UINT8, BASE_HEX, NULL, 0x0,
+ "Bits in the beginning of the SAP header", HFILL }},
+
+ { &hf_sap_flags_v,
+ { "Version Number", "sap.flags.v",
+ FT_UINT8, BASE_DEC, VALS(mcast_sap_ver), MCAST_SAP_VERSION_MASK,
+ "3 bit version field in the SAP header", HFILL }},
+
+ { &hf_sap_flags_a,
+ { "Address Type", "sap.flags.a",
+ FT_BOOLEAN, 8, TFS(&mcast_sap_address_type), MCAST_SAP_BIT_A,
+ "Originating source address type", HFILL }},
+
+ { &hf_sap_flags_r,
+ { "Reserved", "sap.flags.r",
+ FT_BOOLEAN, 8, TFS(&flags_set_truth), MCAST_SAP_BIT_R,
+ "Reserved", HFILL }},
+
+ { &hf_sap_flags_t,
+ { "Message Type", "sap.flags.t",
+ FT_BOOLEAN, 8, TFS(&mcast_sap_message_type), MCAST_SAP_BIT_T,
+ "Announcement type", HFILL }},
+
+ { &hf_sap_flags_e,
+ { "Encryption Bit", "sap.flags.e",
+ FT_BOOLEAN, 8, TFS(&mcast_sap_crypt_type), MCAST_SAP_BIT_E,
+ "Encryption", HFILL }},
+
+ { &hf_sap_flags_c,
+ { "Compression Bit", "sap.flags.c",
+ FT_BOOLEAN, 8, TFS(&mcast_sap_comp_type), MCAST_SAP_BIT_C,
+ "Compression", HFILL }},
+
+ { &hf_auth_data,
+ { "Authentication data", "sap.auth",
+ FT_NONE, BASE_NONE, NULL, 0x0,
+ "Auth data", HFILL }},
+
+ { &hf_auth_flags,
+ { "Authentication data flags", "sap.auth.flags",
+ FT_UINT8, BASE_HEX, NULL, 0x0,
+ "Auth flags", HFILL }},
+
+ { &hf_auth_flags_v,
+ { "Version Number", "sap.auth.flags.v",
+ FT_UINT8, BASE_DEC, VALS(&mcast_sap_auth_ver), MCAST_SAP_VERSION_MASK,
+ "Version", HFILL }},
+
+ { &hf_auth_flags_p,
+ { "Padding Bit", "sap.auth.flags.p",
+ FT_BOOLEAN, 8, TFS(&mcast_sap_auth_pad), MCAST_SAP_AUTH_BIT_P,
+ "Compression", HFILL }},
+
+ { &hf_auth_flags_t,
+ { "Authentication Type", "sap.auth.flags.t",
+ FT_UINT8, BASE_DEC, VALS(&mcast_sap_auth_type), MCAST_SAP_AUTH_TYPE_MASK,
+ "Auth type", HFILL }}
+ };
+ static gint *ett[] = {
+ &ett_sap,
+ &ett_sap_flags,
+ &ett_sap_auth,
+ &ett_sap_authf,
+ };
+
+ proto_sap = proto_register_protocol("Session Announcement Protocol", "SAP",
+ "sap");
+ proto_register_field_array(proto_sap, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+}
+
+void
+proto_reg_handoff_sap(void)
+{
+ dissector_handle_t sap_handle;
+
+ sap_handle = create_dissector_handle(dissect_sap, proto_sap);
+ dissector_add("udp.port", UDP_PORT_SAP, sap_handle);
+
+ /*
+ * Get a handle for the SDP dissector.
+ */
+ sdp_handle = find_dissector("sdp");
+}
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