forked from osmocom/wireshark
![Evan Huus](/assets/img/avatar_default.png)
Change-Id: I9362e0fdc4519ba5f3d656152966e7030f478839 Reviewed-on: https://code.wireshark.org/review/9022 Petri-Dish: Evan Huus <eapache@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Evan Huus <eapache@gmail.com>
405 lines
15 KiB
C
405 lines
15 KiB
C
/* packet-sap.c
|
|
* Routines for sap packet dissection
|
|
* RFC 2974
|
|
*
|
|
* Heikki Vatiainen <hessu@cs.tut.fi>
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/expert.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 */
|
|
|
|
void proto_register_sap(void);
|
|
void proto_reg_handoff_sap(void);
|
|
|
|
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;
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
static int hf_sap_auth_len = -1;
|
|
static int hf_sap_originating_source_ipv4 = -1;
|
|
static int hf_sap_auth_data_padding = -1;
|
|
static int hf_sap_auth_subheader = -1;
|
|
static int hf_sap_originating_source_ipv6 = -1;
|
|
static int hf_sap_message_identifier_hash = -1;
|
|
static int hf_sap_auth_data_padding_len = -1;
|
|
static int hf_sap_payload_type = -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 expert_field ei_sap_compressed_and_encrypted = EI_INIT;
|
|
static expert_field ei_sap_encrypted = EI_INIT;
|
|
static expert_field ei_sap_compressed = EI_INIT;
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
static expert_field ei_sap_bogus_authentication_or_pad_length = EI_INIT;
|
|
|
|
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;
|
|
guint8 auth_flags;
|
|
tvbuff_t *next_tvb;
|
|
|
|
proto_item *si, *sif;
|
|
proto_tree *sap_tree = NULL, *sap_flags_tree;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SAP");
|
|
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) ? (int)sizeof(struct e_in6_addr) : 4;
|
|
|
|
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, ENC_NA);
|
|
sap_tree = proto_item_add_subtree(si, ett_sap);
|
|
|
|
sif = proto_tree_add_item(sap_tree, hf_sap_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
sap_flags_tree = proto_item_add_subtree(sif, ett_sap_flags);
|
|
proto_tree_add_item(sap_flags_tree, hf_sap_flags_v, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(sap_flags_tree, hf_sap_flags_a, tvb, offset, 1, ENC_NA);
|
|
proto_tree_add_item(sap_flags_tree, hf_sap_flags_r, tvb, offset, 1, ENC_NA);
|
|
proto_tree_add_item(sap_flags_tree, hf_sap_flags_t, tvb, offset, 1, ENC_NA);
|
|
proto_tree_add_item(sap_flags_tree, hf_sap_flags_e, tvb, offset, 1, ENC_NA);
|
|
proto_tree_add_item(sap_flags_tree, hf_sap_flags_c, tvb, offset, 1, ENC_NA);
|
|
}
|
|
|
|
offset++;
|
|
|
|
auth_len = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_item(sap_tree, hf_sap_auth_len, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset++;
|
|
|
|
proto_tree_add_item(sap_tree, hf_sap_message_identifier_hash, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset +=2;
|
|
|
|
if (is_ipv6)
|
|
proto_tree_add_item(sap_tree, hf_sap_originating_source_ipv6, tvb, offset, addr_len, ENC_NA);
|
|
else
|
|
proto_tree_add_item(sap_tree, hf_sap_originating_source_ipv4, tvb, offset, addr_len, ENC_BIG_ENDIAN);
|
|
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 = (guint32)(auth_len * sizeof(guint32));
|
|
|
|
sdi = proto_tree_add_item(sap_tree, hf_auth_data, tvb, offset, auth_data_len, ENC_NA);
|
|
sa_tree = proto_item_add_subtree(sdi, ett_sap_auth);
|
|
|
|
auth_flags = tvb_get_guint8(tvb, offset);
|
|
sai = proto_tree_add_item(sa_tree, hf_auth_flags, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
saf_tree = proto_item_add_subtree(sai, ett_sap_authf);
|
|
proto_tree_add_item(saf_tree, hf_auth_flags_v, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(saf_tree, hf_auth_flags_p, tvb, offset, 1, ENC_NA);
|
|
proto_tree_add_item(saf_tree, hf_auth_flags_t, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
has_pad = auth_flags&MCAST_SAP_AUTH_BIT_P;
|
|
if (has_pad) {
|
|
pad_len = tvb_get_guint8(tvb, offset+auth_data_len-1);
|
|
}
|
|
|
|
if ((int) auth_data_len - pad_len - 1 < 0) {
|
|
expert_add_info_format(pinfo, sai, &ei_sap_bogus_authentication_or_pad_length,
|
|
"Bogus authentication length (%d) or pad length (%d)", auth_len, pad_len);
|
|
return;
|
|
}
|
|
|
|
|
|
proto_tree_add_item(sa_tree, hf_sap_auth_subheader, tvb, offset+1, auth_data_len-pad_len-1, ENC_NA);
|
|
if (has_pad) {
|
|
proto_tree_add_item(sa_tree, hf_sap_auth_data_padding_len, tvb, offset+auth_data_len-1, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(sa_tree, hf_sap_auth_data_padding, tvb, offset+auth_data_len-pad_len, pad_len, ENC_NA);
|
|
}
|
|
|
|
offset += auth_data_len;
|
|
}
|
|
|
|
if (is_enc || is_comp) {
|
|
expert_field *mangle;
|
|
if (is_enc && is_comp)
|
|
mangle = &ei_sap_compressed_and_encrypted;
|
|
else if (is_enc)
|
|
mangle = &ei_sap_encrypted;
|
|
else
|
|
mangle = &ei_sap_compressed;
|
|
|
|
proto_tree_add_expert(sap_tree, pinfo, mangle, tvb, offset, -1);
|
|
return;
|
|
}
|
|
|
|
if (tree) {
|
|
/* 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;
|
|
guint8* pt_str;
|
|
|
|
remaining_len = tvb_captured_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;
|
|
}
|
|
|
|
pt_str = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, pt_string_len, ENC_ASCII);
|
|
proto_tree_add_string_format_value(sap_tree, hf_sap_payload_type, tvb, offset, pt_len,
|
|
pt_str, "%.*s", pt_string_len, pt_str);
|
|
offset += pt_len;
|
|
}
|
|
}
|
|
|
|
/* Done with SAP */
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_dissector(sdp_handle, next_tvb, pinfo, tree);
|
|
}
|
|
|
|
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(&tfs_set_notset), MCAST_SAP_BIT_R,
|
|
NULL, 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,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_sap_flags_c,
|
|
{ "Compression Bit", "sap.flags.c",
|
|
FT_BOOLEAN, 8, TFS(&mcast_sap_comp_type), MCAST_SAP_BIT_C,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_auth_data,
|
|
{ "Authentication data", "sap.auth",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_auth_flags,
|
|
{ "Authentication data flags", "sap.auth.flags",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_auth_flags_v,
|
|
{ "Version Number", "sap.auth.flags.v",
|
|
FT_UINT8, BASE_DEC, VALS(mcast_sap_auth_ver), MCAST_SAP_VERSION_MASK,
|
|
NULL, HFILL }},
|
|
|
|
{ &hf_auth_flags_p,
|
|
{ "Padding Bit", "sap.auth.flags.p",
|
|
FT_BOOLEAN, 8, TFS(&mcast_sap_auth_pad), MCAST_SAP_AUTH_BIT_P,
|
|
NULL, 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,
|
|
NULL, HFILL }},
|
|
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
{ &hf_sap_auth_len, { "Authentication Length", "sap.auth.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_message_identifier_hash, { "Message Identifier Hash", "sap.message_identifier_hash", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_originating_source_ipv4, { "Originating Source", "sap.originating_source", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_originating_source_ipv6, { "Originating Source", "sap.originating_source", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_auth_subheader, { "Authentication subheader", "sap.auth.subheader", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_auth_data_padding, { "Authentication data padding", "sap.auth.data_padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_auth_data_padding_len, { "Authentication data pad count (bytes)", "sap.auth.data_padding.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_sap_payload_type, { "Payload type", "sap.payload_type", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_sap,
|
|
&ett_sap_flags,
|
|
&ett_sap_auth,
|
|
&ett_sap_authf,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_sap_compressed_and_encrypted, { "sap.compressed_and_encrypted", PI_UNDECODED, PI_WARN, "The rest of the packet is compressed and encrypted", EXPFILL }},
|
|
{ &ei_sap_encrypted, { "sap.encrypted", PI_UNDECODED, PI_WARN, "The rest of the packet is encrypted", EXPFILL }},
|
|
{ &ei_sap_compressed, { "sap.compressed", PI_UNDECODED, PI_WARN, "The rest of the packet is compressed", EXPFILL }},
|
|
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
{ &ei_sap_bogus_authentication_or_pad_length, { "sap.bogus_authentication_or_pad_length", PI_PROTOCOL, PI_WARN, "Bogus authentication length", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_sap;
|
|
|
|
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));
|
|
expert_sap = expert_register_protocol(proto_sap);
|
|
expert_register_field_array(expert_sap, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_sap(void)
|
|
{
|
|
dissector_handle_t sap_handle;
|
|
|
|
sap_handle = create_dissector_handle(dissect_sap, proto_sap);
|
|
dissector_add_uint("udp.port", UDP_PORT_SAP, sap_handle);
|
|
|
|
/*
|
|
* Get a handle for the SDP dissector.
|
|
*/
|
|
sdp_handle = find_dissector("sdp");
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|