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wireshark/packet-sap.c

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/* packet-sap.c
* Routines for sap packet dissection
* RFC 2974
*
* Heikki Vatiainen <hessu@cs.tut.fi>
*
* $Id: packet-sap.c,v 1.31 2002/12/02 23:43:29 guy Exp $
*
* 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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