osmith/wireshark
1
0
Fork 0
forked from osmocom/wireshark
Code Pull requests Releases Wiki Activity
wireshark/epan/dissectors/packet-sap.c
Guy Harris 8ed7a73e22 Fix a bunch of warnings. 
Cast away some implicit 64-bit-to-32-bit conversion errors due to use of
sizeof.

Cast away some implicit 64-bit-to-32-bit conversion errors due to use of
strtol() and strtoul().

Change some data types to avoid those implicit conversion warnings.

When assigning a constant to a float, make sure the constant isn't a
double, by appending "f" to the constant.

Constify a bunch of variables, parameters, and return values to
eliminate warnings due to strings being given const qualifiers.  Cast
away those warnings in some cases where an API we don't control forces
us to do so.

Enable a bunch of additional warnings by default.  Note why at least
some of the other warnings aren't enabled.

randpkt.c and text2pcap.c are used to build programs, so they don't need
to be in EXTRA_DIST.

If the user specifies --enable-warnings-as-errors, add -Werror *even if
the user specified --enable-extra-gcc-flags; assume they know what
they're doing and are willing to have the compile fail due to the extra
GCC warnings being treated as errors.

svn path=/trunk/; revision=46748
2012-12-26 05:57:06 +00:00

364 lines
13 KiB
C
Raw Blame History

/* packet-sap.c
* Routines for sap packet dissection
* RFC 2974
*
* Heikki Vatiainen <hessu@cs.tut.fi>
*
* $Id$
*
* 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 <string.h>
#include <glib.h>
#include <epan/packet.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;
guint8 auth_flags;
tvbuff_t *next_tvb;
proto_item *si, *sif;
proto_tree *sap_tree, *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;
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, ENC_NA);
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;
proto_tree_add_text(sap_tree, tvb, offset, addr_len, "Originating Source: %s",
(is_ipv6) ? tvb_ip6_to_str(tvb, offset) : tvb_ip_to_str(tvb, offset));
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_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);
if ((int) auth_data_len - pad_len - 1 < 0) {
proto_tree_add_text(sa_tree, tvb, 0, 0,
"Bogus authentication length (%d) or pad length (%d)",
auth_len, pad_len);
return;
}
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) {
const 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_ephemeral_string(tvb, offset, pt_string_len));
offset += pt_len;
}
}
/* Done with SAP */
next_tvb = tvb_new_subset_remaining(tvb, offset);
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(&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,
"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_uint("udp.port", UDP_PORT_SAP, sap_handle);
/*
* Get a handle for the SDP dissector.
*/
sdp_handle = find_dissector("sdp");
}
View git blame Copy permalink