nexmon – Rev 1
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/* packet-http.c
* Routines for HTTP packet disassembly
* RFC 1945 (HTTP/1.0)
* RFC 2616 (HTTP/1.1)
*
* Guy Harris <guy@alum.mit.edu>
*
* Copyright 2004, Jerry Talkington <jtalkington@users.sourceforge.net>
* Copyright 2002, Tim Potter <tpot@samba.org>
* Copyright 1999, Andrew Tridgell <tridge@samba.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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 <errno.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include <epan/follow.h>
#include <epan/addr_resolv.h>
#include <epan/uat.h>
#include <epan/strutil.h>
#include <epan/stats_tree.h>
#include <epan/to_str.h>
#include <epan/req_resp_hdrs.h>
#include <epan/proto_data.h>
#include <wsutil/base64.h>
#include "packet-http.h"
#include "packet-tcp.h"
#include "packet-ssl.h"
void proto_register_http(void);
void proto_reg_handoff_http(void);
void proto_register_message_http(void);
void proto_reg_handoff_message_http(void);
static int http_tap = -1;
static int http_eo_tap = -1;
static int http_follow_tap = -1;
static int proto_http = -1;
static int proto_http2 = -1;
static int proto_ssdp = -1;
static int hf_http_notification = -1;
static int hf_http_response = -1;
static int hf_http_request = -1;
static int hf_http_response_number = -1;
static int hf_http_request_number = -1;
static int hf_http_response_line = -1;
static int hf_http_request_line = -1;
static int hf_http_basic = -1;
static int hf_http_citrix = -1;
static int hf_http_citrix_user = -1;
static int hf_http_citrix_domain = -1;
static int hf_http_citrix_passwd = -1;
static int hf_http_citrix_session = -1;
static int hf_http_request_method = -1;
static int hf_http_request_uri = -1;
static int hf_http_request_full_uri = -1;
static int hf_http_request_path = -1;
static int hf_http_request_query = -1;
static int hf_http_request_query_parameter = -1;
static int hf_http_version = -1;
static int hf_http_response_code = -1;
static int hf_http_response_phrase = -1;
static int hf_http_authorization = -1;
static int hf_http_proxy_authenticate = -1;
static int hf_http_proxy_authorization = -1;
static int hf_http_proxy_connect_host = -1;
static int hf_http_proxy_connect_port = -1;
static int hf_http_www_authenticate = -1;
static int hf_http_content_type = -1;
static int hf_http_content_length_header = -1;
static int hf_http_content_length = -1;
static int hf_http_content_encoding = -1;
static int hf_http_transfer_encoding = -1;
static int hf_http_upgrade = -1;
static int hf_http_user_agent = -1;
static int hf_http_host = -1;
static int hf_http_connection = -1;
static int hf_http_cookie = -1;
static int hf_http_cookie_pair = -1;
static int hf_http_accept = -1;
static int hf_http_referer = -1;
static int hf_http_accept_language = -1;
static int hf_http_accept_encoding = -1;
static int hf_http_date = -1;
static int hf_http_cache_control = -1;
static int hf_http_server = -1;
static int hf_http_location = -1;
static int hf_http_sec_websocket_accept = -1;
static int hf_http_sec_websocket_extensions = -1;
static int hf_http_sec_websocket_key = -1;
static int hf_http_sec_websocket_protocol = -1;
static int hf_http_sec_websocket_version = -1;
static int hf_http_set_cookie = -1;
static int hf_http_last_modified = -1;
static int hf_http_x_forwarded_for = -1;
static int hf_http_request_in = -1;
static int hf_http_response_in = -1;
static int hf_http_next_request_in = -1;
static int hf_http_next_response_in = -1;
static int hf_http_prev_request_in = -1;
static int hf_http_prev_response_in = -1;
static int hf_http_time = -1;
static int hf_http_chunk_size = -1;
static int hf_http_chunk_boundary = -1;
static int hf_http_chunked_trailer_part = -1;
static int hf_http_file_data = -1;
static int hf_http_unknown_header = -1;
static gint ett_http = -1;
static gint ett_http_ntlmssp = -1;
static gint ett_http_kerberos = -1;
static gint ett_http_request = -1;
static gint ett_http_request_path = -1;
static gint ett_http_request_query = -1;
static gint ett_http_chunked_response = -1;
static gint ett_http_chunk_data = -1;
static gint ett_http_encoded_entity = -1;
static gint ett_http_header_item = -1;
static expert_field ei_http_chat = EI_INIT;
static expert_field ei_http_te_and_length = EI_INIT;
static expert_field ei_http_te_unknown = EI_INIT;
static expert_field ei_http_subdissector_failed = EI_INIT;
static expert_field ei_http_ssl_port = EI_INIT;
static expert_field ei_http_leading_crlf = EI_INIT;
static dissector_handle_t http_handle;
static dissector_handle_t http_tcp_handle;
static dissector_handle_t http_ssl_handle;
static dissector_handle_t http_sctp_handle;
static dissector_handle_t media_handle;
static dissector_handle_t websocket_handle;
static dissector_handle_t http2_handle;
static dissector_handle_t sstp_handle;
static dissector_handle_t ntlmssp_handle;
static dissector_handle_t gssapi_handle;
/* Stuff for generation/handling of fields for custom HTTP headers */
typedef struct _header_field_t {
gchar* header_name;
gchar* header_desc;
} header_field_t;
static header_field_t* header_fields = NULL;
static guint num_header_fields = 0;
static GHashTable* header_fields_hash = NULL;
static gboolean
header_fields_update_cb(void *r, char **err)
{
header_field_t *rec = (header_field_t *)r;
char c;
if (rec->header_name == NULL) {
*err = g_strdup("Header name can't be empty");
return FALSE;
}
g_strstrip(rec->header_name);
if (rec->header_name[0] == 0) {
*err = g_strdup("Header name can't be empty");
return FALSE;
}
/* Check for invalid characters (to avoid asserting out when
* registering the field).
*/
c = proto_check_field_name(rec->header_name);
if (c) {
*err = g_strdup_printf("Header name can't contain '%c'", c);
return FALSE;
}
*err = NULL;
return TRUE;
}
static void *
header_fields_copy_cb(void* n, const void* o, size_t siz _U_)
{
header_field_t* new_rec = (header_field_t*)n;
const header_field_t* old_rec = (const header_field_t*)o;
if (old_rec->header_name) {
new_rec->header_name = g_strdup(old_rec->header_name);
} else {
new_rec->header_name = NULL;
}
if (old_rec->header_desc) {
new_rec->header_desc = g_strdup(old_rec->header_desc);
} else {
new_rec->header_desc = NULL;
}
return new_rec;
}
static void
header_fields_free_cb(void*r)
{
header_field_t* rec = (header_field_t*)r;
if (rec->header_name)
g_free(rec->header_name);
if (rec->header_desc)
g_free(rec->header_desc);
}
UAT_CSTRING_CB_DEF(header_fields, header_name, header_field_t)
UAT_CSTRING_CB_DEF(header_fields, header_desc, header_field_t)
/*
* desegmentation of HTTP headers
* (when we are over TCP or another protocol providing the desegmentation API)
*/
static gboolean http_desegment_headers = TRUE;
/*
* desegmentation of HTTP bodies
* (when we are over TCP or another protocol providing the desegmentation API)
* TODO let the user filter on content-type the bodies he wants desegmented
*/
static gboolean http_desegment_body = TRUE;
/*
* De-chunking of content-encoding: chunk entity bodies.
*/
static gboolean http_dechunk_body = TRUE;
/*
* Decompression of zlib encoded entities.
*/
#ifdef HAVE_ZLIB
static gboolean http_decompress_body = TRUE;
#else
static gboolean http_decompress_body = FALSE;
#endif
/* Simple Service Discovery Protocol
* SSDP is implemented atop HTTP (yes, it really *does* run over UDP).
* SSDP is the discovery protocol of Universal Plug and Play
* UPnP http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.1.pdf
*/
#define TCP_PORT_SSDP 1900
#define UDP_PORT_SSDP 1900
/*
* tcp and ssl ports
*
* 2710 is the XBT BitTorrent tracker
*/
#define TCP_DEFAULT_RANGE "80,3128,3132,5985,8080,8088,11371,1900,2869,2710"
#define SCTP_DEFAULT_RANGE "80"
#define SSL_DEFAULT_RANGE "443"
#define UPGRADE_WEBSOCKET 1
#define UPGRADE_HTTP2 2
#define UPGRADE_SSTP 3
static range_t *global_http_tcp_range = NULL;
static range_t *global_http_sctp_range = NULL;
static range_t *global_http_ssl_range = NULL;
static range_t *http_tcp_range = NULL;
static range_t *http_sctp_range = NULL;
static range_t *http_ssl_range = NULL;
typedef void (*ReqRespDissector)(tvbuff_t*, proto_tree*, int, const guchar*,
const guchar*, http_conv_t *);
/**
* Transfer codings from
* https://www.iana.org/assignments/http-parameters/http-parameters.xhtml#transfer-coding
* Note: chunked encoding is handled separately.
*/
typedef enum _http_transfer_coding {
HTTP_TE_NONE, /* Dummy value for header which is not set */
/* HTTP_TE_CHUNKED, */
HTTP_TE_COMPRESS,
HTTP_TE_DEFLATE,
HTTP_TE_GZIP,
HTTP_TE_IDENTITY,
HTTP_TE_UNKNOWN, /* Header was set, but no valid name was found */
} http_transfer_coding;
/*
* Structure holding information from headers needed by main
* HTTP dissector code.
*/
typedef struct {
char *content_type;
char *content_type_parameters;
gboolean have_content_length;
gint64 content_length;
char *content_encoding;
gboolean transfer_encoding_chunked;
http_transfer_coding transfer_encoding;
guint8 upgrade;
} headers_t;
static int is_http_request_or_reply(const gchar *data, int linelen,
http_type_t *type, ReqRespDissector
*reqresp_dissector, http_conv_t *conv_data);
static guint chunked_encoding_dissector(tvbuff_t **tvb_ptr, packet_info *pinfo,
proto_tree *tree, int offset);
static void process_header(tvbuff_t *tvb, int offset, int next_offset,
const guchar *line, int linelen, int colon_offset,
packet_info *pinfo, proto_tree *tree,
headers_t *eh_ptr, http_conv_t *conv_data,
int http_type);
static gint find_header_hf_value(tvbuff_t *tvb, int offset, guint header_len);
static gboolean check_auth_ntlmssp(proto_item *hdr_item, tvbuff_t *tvb,
packet_info *pinfo, gchar *value);
static gboolean check_auth_basic(proto_item *hdr_item, tvbuff_t *tvb,
gchar *value);
static gboolean check_auth_citrixbasic(proto_item *hdr_item, tvbuff_t *tvb,
gchar *value, int offset);
static gboolean check_auth_kerberos(proto_item *hdr_item, tvbuff_t *tvb,
packet_info *pinfo, const gchar *value);
static dissector_table_t port_subdissector_table;
static dissector_table_t media_type_subdissector_table;
static heur_dissector_list_t heur_subdissector_list;
/* --- HTTP Status Codes */
/* Note: The reference for uncommented entries is RFC 2616 */
const value_string vals_http_status_code[] = {
{ 100, "Continue" },
{ 101, "Switching Protocols" },
{ 102, "Processing" }, /* RFC 2518 */
{ 199, "Informational - Others" },
{ 200, "OK"},
{ 201, "Created"},
{ 202, "Accepted"},
{ 203, "Non-authoritative Information"},
{ 204, "No Content"},
{ 205, "Reset Content"},
{ 206, "Partial Content"},
{ 207, "Multi-Status"}, /* RFC 4918 */
{ 226, "IM Used"}, /* RFC 3229 */
{ 299, "Success - Others"},
{ 300, "Multiple Choices"},
{ 301, "Moved Permanently"},
{ 302, "Found"},
{ 303, "See Other"},
{ 304, "Not Modified"},
{ 305, "Use Proxy"},
{ 307, "Temporary Redirect"},
{ 399, "Redirection - Others"},
{ 400, "Bad Request"},
{ 401, "Unauthorized"},
{ 402, "Payment Required"},
{ 403, "Forbidden"},
{ 404, "Not Found"},
{ 405, "Method Not Allowed"},
{ 406, "Not Acceptable"},
{ 407, "Proxy Authentication Required"},
{ 408, "Request Time-out"},
{ 409, "Conflict"},
{ 410, "Gone"},
{ 411, "Length Required"},
{ 412, "Precondition Failed"},
{ 413, "Request Entity Too Large"},
{ 414, "Request-URI Too Long"},
{ 415, "Unsupported Media Type"},
{ 416, "Requested Range Not Satisfiable"},
{ 417, "Expectation Failed"},
{ 418, "I'm a teapot"}, /* RFC 2324 */
{ 422, "Unprocessable Entity"}, /* RFC 4918 */
{ 423, "Locked"}, /* RFC 4918 */
{ 424, "Failed Dependency"}, /* RFC 4918 */
{ 426, "Upgrade Required"}, /* RFC 2817 */
{ 428, "Precondition Required"}, /* RFC 6585 */
{ 429, "Too Many Requests"}, /* RFC 6585 */
{ 431, "Request Header Fields Too Large"}, /* RFC 6585 */
{ 499, "Client Error - Others"},
{ 500, "Internal Server Error"},
{ 501, "Not Implemented"},
{ 502, "Bad Gateway"},
{ 503, "Service Unavailable"},
{ 504, "Gateway Time-out"},
{ 505, "HTTP Version not supported"},
{ 507, "Insufficient Storage"}, /* RFC 4918 */
{ 511, "Network Authentication Required"}, /* RFC 6585 */
{ 599, "Server Error - Others"},
{ 0, NULL}
};
static const gchar* st_str_reqs = "HTTP Requests by Server";
static const gchar* st_str_reqs_by_srv_addr = "HTTP Requests by Server Address";
static const gchar* st_str_reqs_by_http_host = "HTTP Requests by HTTP Host";
static const gchar* st_str_resps_by_srv_addr = "HTTP Responses by Server Address";
static int st_node_reqs = -1;
static int st_node_reqs_by_srv_addr = -1;
static int st_node_reqs_by_http_host = -1;
static int st_node_resps_by_srv_addr = -1;
/* HTTP/Load Distribution stats init function */
static void
http_reqs_stats_tree_init(stats_tree* st)
{
st_node_reqs = stats_tree_create_node(st, st_str_reqs, 0, TRUE);
st_node_reqs_by_srv_addr = stats_tree_create_node(st, st_str_reqs_by_srv_addr, st_node_reqs, TRUE);
st_node_reqs_by_http_host = stats_tree_create_node(st, st_str_reqs_by_http_host, st_node_reqs, TRUE);
st_node_resps_by_srv_addr = stats_tree_create_node(st, st_str_resps_by_srv_addr, 0, TRUE);
}
/* HTTP/Load Distribution stats packet function */
static int
http_reqs_stats_tree_packet(stats_tree* st, packet_info* pinfo, epan_dissect_t* edt _U_, const void* p)
{
const http_info_value_t* v = (const http_info_value_t*)p;
int reqs_by_this_host;
int reqs_by_this_addr;
int resps_by_this_addr;
int i = v->response_code;
gchar *ip_str;
if (v->request_method) {
ip_str = address_to_str(NULL, &pinfo->dst);
tick_stat_node(st, st_str_reqs, 0, FALSE);
tick_stat_node(st, st_str_reqs_by_srv_addr, st_node_reqs, TRUE);
tick_stat_node(st, st_str_reqs_by_http_host, st_node_reqs, TRUE);
reqs_by_this_addr = tick_stat_node(st, ip_str, st_node_reqs_by_srv_addr, TRUE);
if (v->http_host) {
reqs_by_this_host = tick_stat_node(st, v->http_host, st_node_reqs_by_http_host, TRUE);
tick_stat_node(st, ip_str, reqs_by_this_host, FALSE);
tick_stat_node(st, v->http_host, reqs_by_this_addr, FALSE);
}
wmem_free(NULL, ip_str);
return 1;
} else if (i != 0) {
ip_str = address_to_str(NULL, &pinfo->src);
tick_stat_node(st, st_str_resps_by_srv_addr, 0, FALSE);
resps_by_this_addr = tick_stat_node(st, ip_str, st_node_resps_by_srv_addr, TRUE);
if ( (i>100)&&(i<400) ) {
tick_stat_node(st, "OK", resps_by_this_addr, FALSE);
} else {
tick_stat_node(st, "KO", resps_by_this_addr, FALSE);
}
wmem_free(NULL, ip_str);
return 1;
}
return 0;
}
static int st_node_requests_by_host = -1;
static const gchar *st_str_requests_by_host = "HTTP Requests by HTTP Host";
/* HTTP/Requests stats init function */
static void
http_req_stats_tree_init(stats_tree* st)
{
st_node_requests_by_host = stats_tree_create_node(st, st_str_requests_by_host, 0, TRUE);
}
/* HTTP/Requests stats packet function */
static int
http_req_stats_tree_packet(stats_tree* st, packet_info* pinfo _U_, epan_dissect_t* edt _U_, const void* p)
{
const http_info_value_t* v = (const http_info_value_t*)p;
int reqs_by_this_host;
if (v->request_method) {
tick_stat_node(st, st_str_requests_by_host, 0, FALSE);
if (v->http_host) {
reqs_by_this_host = tick_stat_node(st, v->http_host, st_node_requests_by_host, TRUE);
if (v->request_uri) {
tick_stat_node(st, v->request_uri, reqs_by_this_host, TRUE);
}
}
return 1;
}
return 0;
}
static const gchar *st_str_packets = "Total HTTP Packets";
static const gchar *st_str_requests = "HTTP Request Packets";
static const gchar *st_str_responses = "HTTP Response Packets";
static const gchar *st_str_resp_broken = "???: broken";
static const gchar *st_str_resp_100 = "1xx: Informational";
static const gchar *st_str_resp_200 = "2xx: Success";
static const gchar *st_str_resp_300 = "3xx: Redirection";
static const gchar *st_str_resp_400 = "4xx: Client Error";
static const gchar *st_str_resp_500 = "5xx: Server Error";
static const gchar *st_str_other = "Other HTTP Packets";
static int st_node_packets = -1;
static int st_node_requests = -1;
static int st_node_responses = -1;
static int st_node_resp_broken = -1;
static int st_node_resp_100 = -1;
static int st_node_resp_200 = -1;
static int st_node_resp_300 = -1;
static int st_node_resp_400 = -1;
static int st_node_resp_500 = -1;
static int st_node_other = -1;
/* HTTP/Packet Counter stats init function */
static void
http_stats_tree_init(stats_tree* st)
{
st_node_packets = stats_tree_create_node(st, st_str_packets, 0, TRUE);
st_node_requests = stats_tree_create_pivot(st, st_str_requests, st_node_packets);
st_node_responses = stats_tree_create_node(st, st_str_responses, st_node_packets, TRUE);
st_node_resp_broken = stats_tree_create_node(st, st_str_resp_broken, st_node_responses, TRUE);
st_node_resp_100 = stats_tree_create_node(st, st_str_resp_100, st_node_responses, TRUE);
st_node_resp_200 = stats_tree_create_node(st, st_str_resp_200, st_node_responses, TRUE);
st_node_resp_300 = stats_tree_create_node(st, st_str_resp_300, st_node_responses, TRUE);
st_node_resp_400 = stats_tree_create_node(st, st_str_resp_400, st_node_responses, TRUE);
st_node_resp_500 = stats_tree_create_node(st, st_str_resp_500, st_node_responses, TRUE);
st_node_other = stats_tree_create_node(st, st_str_other, st_node_packets,FALSE);
}
/* HTTP/Packet Counter stats packet function */
static int
http_stats_tree_packet(stats_tree* st, packet_info* pinfo _U_, epan_dissect_t* edt _U_, const void* p)
{
const http_info_value_t* v = (const http_info_value_t*)p;
guint i = v->response_code;
int resp_grp;
const gchar *resp_str;
gchar str[64];
tick_stat_node(st, st_str_packets, 0, FALSE);
if (i) {
tick_stat_node(st, st_str_responses, st_node_packets, FALSE);
if ( (i<100)||(i>=600) ) {
resp_grp = st_node_resp_broken;
resp_str = st_str_resp_broken;
} else if (i<200) {
resp_grp = st_node_resp_100;
resp_str = st_str_resp_100;
} else if (i<300) {
resp_grp = st_node_resp_200;
resp_str = st_str_resp_200;
} else if (i<400) {
resp_grp = st_node_resp_300;
resp_str = st_str_resp_300;
} else if (i<500) {
resp_grp = st_node_resp_400;
resp_str = st_str_resp_400;
} else {
resp_grp = st_node_resp_500;
resp_str = st_str_resp_500;
}
tick_stat_node(st, resp_str, st_node_responses, FALSE);
g_snprintf(str, sizeof(str), "%u %s", i,
val_to_str(i, vals_http_status_code, "Unknown (%d)"));
tick_stat_node(st, str, resp_grp, FALSE);
} else if (v->request_method) {
stats_tree_tick_pivot(st,st_node_requests,v->request_method);
} else {
tick_stat_node(st, st_str_other, st_node_packets, FALSE);
}
return 1;
}
static void
dissect_http_ntlmssp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
const char *line)
{
tvbuff_t *ntlmssp_tvb;
ntlmssp_tvb = base64_to_tvb(tvb, line);
add_new_data_source(pinfo, ntlmssp_tvb, "NTLMSSP / GSSAPI Data");
if (tvb_strneql(ntlmssp_tvb, 0, "NTLMSSP", 7) == 0)
call_dissector(ntlmssp_handle, ntlmssp_tvb, pinfo, tree);
else
call_dissector(gssapi_handle, ntlmssp_tvb, pinfo, tree);
}
static void
dissect_http_kerberos(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
const char *line)
{
tvbuff_t *kerberos_tvb;
kerberos_tvb = base64_to_tvb(tvb, line + 9); /* skip 'Kerberos ' which is 9 chars */
add_new_data_source(pinfo, kerberos_tvb, "Kerberos Data");
call_dissector(gssapi_handle, kerberos_tvb, pinfo, tree);
}
static http_conv_t *
get_http_conversation_data(packet_info *pinfo, conversation_t **conversation)
{
http_conv_t *conv_data;
*conversation = find_or_create_conversation(pinfo);
/* Retrieve information from conversation
* or add it if it isn't there yet
*/
conv_data = (http_conv_t *)conversation_get_proto_data(*conversation, proto_http);
if(!conv_data) {
/* Setup the conversation structure itself */
conv_data = (http_conv_t *)wmem_alloc0(wmem_file_scope(), sizeof(http_conv_t));
conversation_add_proto_data(*conversation, proto_http,
conv_data);
}
return conv_data;
}
/**
* create a new http_req_res_t and add it to the conversation.
* @return the new allocated object which is already added to the linked list
*/
static http_req_res_t* push_req_res(http_conv_t *conv_data)
{
http_req_res_t *req_res = (http_req_res_t *)wmem_alloc0(wmem_file_scope(), sizeof(http_req_res_t));
nstime_set_unset(&(req_res->req_ts));
req_res->number = ++conv_data->req_res_num;
if (! conv_data->req_res_tail) {
conv_data->req_res_tail = req_res;
} else {
req_res->prev = conv_data->req_res_tail;
conv_data->req_res_tail->next = req_res;
conv_data->req_res_tail = req_res;
}
return req_res;
}
/**
* push a request frame number and its time stamp to the conversation data.
*/
static void push_req(http_conv_t *conv_data, packet_info *pinfo)
{
/* a request will always create a new http_req_res_t object */
http_req_res_t *req_res = push_req_res(conv_data);
req_res->req_framenum = pinfo->num;
req_res->req_ts = pinfo->abs_ts;
p_add_proto_data(wmem_file_scope(), pinfo, proto_http, 0, req_res);
}
/**
* push a response frame number to the conversation data.
*/
static void push_res(http_conv_t *conv_data, packet_info *pinfo)
{
/* a response will create a new http_req_res_t object: if no
object exists, or if one exists for another response. In
both cases the corresponding request was not
detected/included in the conversation. In all other cases
the http_req_res_t object created by the request is
used. */
http_req_res_t *req_res = conv_data->req_res_tail;
if (!req_res || req_res->res_framenum > 0) {
req_res = push_req_res(conv_data);
}
req_res->res_framenum = pinfo->num;
p_add_proto_data(wmem_file_scope(), pinfo, proto_http, 0, req_res);
}
/*
* TODO: remove this ugly global variable.
* XXX: do we really want to have to pass this from one function to another?
*/
static http_info_value_t *stat_info;
static int
dissect_http_message(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, http_conv_t *conv_data,
const char* proto_tag, int proto, gboolean end_of_stream)
{
proto_tree *http_tree = NULL;
proto_item *ti = NULL;
proto_item *hidden_item;
const guchar *line, *firstline;
gint next_offset;
const guchar *linep, *lineend;
int orig_offset;
int first_linelen, linelen;
gboolean is_request_or_reply, is_ssl = FALSE;
gboolean saw_req_resp_or_header;
guchar c;
http_type_t http_type;
proto_item *hdr_item = NULL;
ReqRespDissector reqresp_dissector;
proto_tree *req_tree;
int colon_offset;
headers_t headers;
int datalen;
int reported_datalen = -1;
dissector_handle_t handle;
gboolean dissected = FALSE;
gboolean first_loop = TRUE;
gboolean have_seen_http = FALSE;
/*guint i;*/
/*http_info_value_t *si;*/
http_eo_t *eo_info;
heur_dtbl_entry_t *hdtbl_entry;
int reported_length;
guint16 word;
gboolean leading_crlf = FALSE;
http_message_info_t message_info;
reported_length = tvb_reported_length_remaining(tvb, offset);
if (reported_length < 1) {
return -1;
}
/* RFC 2616
* In the interest of robustness, servers SHOULD ignore any empty
* line(s) received where a Request-Line is expected. In other words, if
* the server is reading the protocol stream at the beginning of a
* message and receives a CRLF first, it should ignore the CRLF.
*/
if (reported_length > 3) {
word = tvb_get_ntohs(tvb,offset);
if (word == 0x0d0a) {
leading_crlf = TRUE;
offset += 2;
}
}
/*
* If we previously dissected an HTTP request in this conversation then
* we should be pretty sure that whatever we got in this TVB is
* actually HTTP (even if what we have here is part of a file being
* transferred over HTTP).
*/
if (conv_data->request_uri)
have_seen_http = TRUE;
/*
* If this is binary data then there's no point in doing all the string
* operations below: they'll just be slow on this data.
*/
if (!g_ascii_isprint(tvb_get_guint8(tvb, offset))) {
/*
* But, if we've seen some real HTTP then we're sure this is
* an HTTP conversation. Mark it as such.
*/
if (have_seen_http) {
col_set_str(pinfo->cinfo, COL_PROTOCOL, proto_tag);
col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
http_tree = proto_item_add_subtree(ti, ett_http);
call_data_dissector(tvb, pinfo, http_tree);
}
return -1;
}
/*
* Is this a request or response?
*
* Note that "tvb_find_line_end()" will return a value that
* is not longer than what's in the buffer, so the
* "tvb_get_ptr()" call won't throw an exception.
*/
first_linelen = tvb_find_line_end(tvb, offset,
tvb_ensure_captured_length_remaining(tvb, offset), &next_offset,
TRUE);
if (first_linelen == -1) {
/* No complete line was found in this segment, do
* desegmentation if we're told to.
*/
if (!req_resp_hdrs_do_reassembly(tvb, offset, pinfo,
http_desegment_headers, http_desegment_body)) {
/*
* More data needed for desegmentation.
*/
return -1;
}
}
/*
* Is the first line a request or response?
*
* Note that "tvb_find_line_end()" will return a value that
* is not longer than what's in the buffer, so the
* "tvb_get_ptr()" call won't throw an exception.
*/
firstline = tvb_get_ptr(tvb, offset, first_linelen);
http_type = HTTP_OTHERS; /* type not known yet */
is_request_or_reply = is_http_request_or_reply((const gchar *)firstline,
first_linelen, &http_type, NULL, conv_data);
if (is_request_or_reply) {
gboolean try_desegment_body;
/*
* Yes, it's a request or response.
* Put the first line from the buffer into the summary
* (but leave out the line terminator).
*/
col_add_fstr(pinfo->cinfo, COL_INFO, "%s ", format_text(firstline, first_linelen));
/*
* Do header desegmentation if we've been told to,
* and do body desegmentation if we've been told to and
* we find a Content-Length header. Responses to HEAD MUST NOT
* contain a message body, so ignore the Content-Length header
* which is done by disabling body desegmentation.
*/
try_desegment_body = (http_desegment_body &&
(!(conv_data->request_method && g_str_equal(conv_data->request_method, "HEAD"))) &&
!end_of_stream);
if (!req_resp_hdrs_do_reassembly(tvb, offset, pinfo,
http_desegment_headers, try_desegment_body)) {
/*
* More data needed for desegmentation.
*/
return -1;
}
} else if (have_seen_http) {
/*
* If we know this is HTTP then call it continuation.
*/
col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
}
if (is_request_or_reply || have_seen_http) {
/*
* Now set COL_PROTOCOL and create the http tree for the
* cases where we set COL_INFO above.
*/
col_set_str(pinfo->cinfo, COL_PROTOCOL, proto_tag);
ti = proto_tree_add_item(tree, proto, tvb, offset, -1, ENC_NA);
http_tree = proto_item_add_subtree(ti, ett_http);
if (leading_crlf) {
proto_tree_add_expert(http_tree, pinfo, &ei_http_leading_crlf, tvb, offset-2, 2);
}
}
is_ssl = proto_is_frame_protocol(pinfo->layers, "ssl");
stat_info = wmem_new(wmem_packet_scope(), http_info_value_t);
stat_info->framenum = pinfo->num;
stat_info->response_code = 0;
stat_info->request_method = NULL;
stat_info->request_uri = NULL;
stat_info->http_host = NULL;
orig_offset = offset;
/*
* Process the packet data, a line at a time.
*/
http_type = HTTP_OTHERS; /* type not known yet */
headers.content_type = NULL; /* content type not known yet */
headers.content_type_parameters = NULL; /* content type parameters too */
headers.have_content_length = FALSE; /* content length not known yet */
headers.content_length = 0; /* content length set to 0 (avoid a gcc warning) */
headers.content_encoding = NULL; /* content encoding not known yet */
headers.transfer_encoding_chunked = FALSE;
headers.transfer_encoding = HTTP_TE_NONE;
headers.upgrade = 0; /* assume we're not upgrading */
saw_req_resp_or_header = FALSE; /* haven't seen anything yet */
while (tvb_offset_exists(tvb, offset)) {
/*
* Find the end of the line.
* XXX - what if we don't find it because the packet
* is cut short by a snapshot length or the header is
* split across TCP segments? How much dissection should
* we do on it?
*/
linelen = tvb_find_line_end(tvb, offset,
tvb_ensure_captured_length_remaining(tvb, offset), &next_offset,
FALSE);
if (linelen < 0)
return -1;
/*
* Get a buffer that refers to the line.
*
* Note that "tvb_find_line_end()" will return a value that
* is not longer than what's in the buffer, so the
* "tvb_get_ptr()" call won't throw an exception.
*/
line = tvb_get_ptr(tvb, offset, linelen);
lineend = line + linelen;
colon_offset = -1;
/*
* OK, does it look like an HTTP request or response?
*/
reqresp_dissector = NULL;
is_request_or_reply =
is_http_request_or_reply((const gchar *)line,
linelen, &http_type, &reqresp_dissector, conv_data);
if (is_request_or_reply)
goto is_http;
/*
* No. Does it look like a blank line (as would appear
* at the end of an HTTP request)?
*/
if (linelen == 0)
goto is_http; /* Yes. */
/*
* No. Does it look like a header?
*/
linep = line;
colon_offset = offset;
while (linep < lineend) {
c = *linep++;
/*
* This must be a CHAR, and must not be a CTL,
* to be part of a token; that means it must
* be printable ASCII.
*
* XXX - what about leading LWS on continuation
* lines of a header?
*/
if (!g_ascii_isprint(c))
break;
/*
* This mustn't be a SEP to be part of a token;
* a ':' ends the token, everything else is an
* indication that this isn't a header.
*/
switch (c) {
case '(':
case ')':
case '<':
case '>':
case '@':
case ',':
case ';':
case '\\':
case '"':
case '/':
case '[':
case ']':
case '?':
case '=':
case '{':
case '}':
case ' ':
/*
* It's a separator, so it's not part of a
* token, so it's not a field name for the
* beginning of a header.
*
* (We don't have to check for HT; that's
* already been ruled out by "iscntrl()".)
*/
goto not_http;
case ':':
/*
* This ends the token; we consider this
* to be a header.
*/
goto is_http;
default:
colon_offset++;
break;
}
}
/*
* We haven't seen the colon, but everything else looks
* OK for a header line.
*
* If we've already seen an HTTP request or response
* line, or a header line, and we're at the end of
* the tvbuff, we assume this is an incomplete header
* line. (We quit this loop after seeing a blank line,
* so if we've seen a request or response line, or a
* header line, this is probably more of the request
* or response we're presumably seeing. There is some
* risk of false positives, but the same applies for
* full request or response lines or header lines,
* although that's less likely.)
*
* We throw an exception in that case, by checking for
* the existence of the next byte after the last one
* in the line. If it exists, "tvb_ensure_bytes_exist()"
* throws no exception, and we fall through to the
* "not HTTP" case. If it doesn't exist,
* "tvb_ensure_bytes_exist()" will throw the appropriate
* exception.
*/
if (saw_req_resp_or_header)
tvb_ensure_bytes_exist(tvb, offset, linelen + 1);
not_http:
/*
* We don't consider this part of an HTTP request or
* reply, so we don't display it.
* (Yeah, that means we don't display, say, a text/http
* page, but you can get that from the data pane.)
*/
break;
is_http:
if ((tree) && (http_tree == NULL)) {
ti = proto_tree_add_item(tree, proto, tvb, orig_offset, -1, ENC_NA);
http_tree = proto_item_add_subtree(ti, ett_http);
if (leading_crlf) {
proto_tree_add_expert(http_tree, pinfo, &ei_http_leading_crlf, tvb, orig_offset-2, 2);
}
}
if (first_loop && !is_ssl && pinfo->ptype == PT_TCP &&
(pinfo->srcport == 443 || pinfo->destport == 443)) {
expert_add_info(pinfo, ti, &ei_http_ssl_port);
}
first_loop = FALSE;
/*
* Process this line.
*/
if (linelen == 0) {
/*
* This is a blank line, which means that
* whatever follows it isn't part of this
* request or reply.
*/
proto_tree_add_format_text(http_tree, tvb, offset, next_offset - offset);
offset = next_offset;
break;
}
/*
* Not a blank line - either a request, a reply, or a header
* line.
*/
saw_req_resp_or_header = TRUE;
if (is_request_or_reply) {
char *text = tvb_format_text(tvb, offset, next_offset - offset);
req_tree = proto_tree_add_subtree(http_tree, tvb,
offset, next_offset - offset, ett_http_request, &hdr_item, text);
expert_add_info_format(pinfo, hdr_item, &ei_http_chat, "%s", text);
if (reqresp_dissector) {
reqresp_dissector(tvb, req_tree, offset, line,
lineend, conv_data);
}
} else {
/*
* Header.
*/
process_header(tvb, offset, next_offset, line, linelen,
colon_offset, pinfo, http_tree, &headers, conv_data,
http_type);
}
offset = next_offset;
}
if (tree && stat_info->http_host && stat_info->request_uri) {
proto_item *e_ti;
gchar *uri;
if ((g_ascii_strncasecmp(stat_info->request_uri, "http://", 7) == 0) ||
(g_ascii_strncasecmp(stat_info->request_uri, "https://", 8) == 0) ||
(g_ascii_strncasecmp(conv_data->request_method, "CONNECT", 7) == 0)) {
uri = wmem_strdup(wmem_packet_scope(), stat_info->request_uri);
}
else {
uri = wmem_strdup_printf(wmem_packet_scope(), "%s://%s%s",
is_ssl ? "https" : "http",
g_strstrip(wmem_strdup(wmem_packet_scope(), stat_info->http_host)), stat_info->request_uri);
}
e_ti = proto_tree_add_string(http_tree,
hf_http_request_full_uri, tvb, 0,
0, uri);
PROTO_ITEM_SET_URL(e_ti);
PROTO_ITEM_SET_GENERATED(e_ti);
}
if (!PINFO_FD_VISITED(pinfo)) {
if (http_type == HTTP_REQUEST) {
push_req(conv_data, pinfo);
} else if (http_type == HTTP_RESPONSE) {
push_res(conv_data, pinfo);
}
}
if (tree) {
proto_item *pi;
http_req_res_t *curr = (http_req_res_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_http, 0);
http_req_res_t *prev = curr ? curr->prev : NULL;
http_req_res_t *next = curr ? curr->next : NULL;
switch (http_type) {
case HTTP_NOTIFICATION:
hidden_item = proto_tree_add_boolean(http_tree,
hf_http_notification, tvb, 0, 0, 1);
PROTO_ITEM_SET_HIDDEN(hidden_item);
break;
case HTTP_RESPONSE:
hidden_item = proto_tree_add_boolean(http_tree,
hf_http_response, tvb, 0, 0, 1);
PROTO_ITEM_SET_HIDDEN(hidden_item);
if (curr) {
nstime_t delta;
pi = proto_tree_add_uint_format(http_tree, hf_http_response_number, tvb, 0, 0, curr->number, "HTTP response %u/%u", curr->number, conv_data->req_res_num);
PROTO_ITEM_SET_GENERATED(pi);
if (! nstime_is_unset(&(curr->req_ts))) {
nstime_delta(&delta, &pinfo->abs_ts, &(curr->req_ts));
pi = proto_tree_add_time(http_tree, hf_http_time, tvb, 0, 0, &delta);
PROTO_ITEM_SET_GENERATED(pi);
}
}
if (prev && prev->req_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_prev_request_in, tvb, 0, 0, prev->req_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
if (prev && prev->res_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_prev_response_in, tvb, 0, 0, prev->res_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
if (curr && curr->req_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_request_in, tvb, 0, 0, curr->req_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
if (next && next->req_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_next_request_in, tvb, 0, 0, next->req_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
if (next && next->res_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_next_response_in, tvb, 0, 0, next->res_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
break;
case HTTP_REQUEST:
hidden_item = proto_tree_add_boolean(http_tree,
hf_http_request, tvb, 0, 0, 1);
PROTO_ITEM_SET_HIDDEN(hidden_item);
if (curr) {
pi = proto_tree_add_uint_format(http_tree, hf_http_request_number, tvb, 0, 0, curr->number, "HTTP request %u/%u", curr->number, conv_data->req_res_num);
PROTO_ITEM_SET_GENERATED(pi);
}
if (prev && prev->req_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_prev_request_in, tvb, 0, 0, prev->req_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
if (curr && curr->res_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_response_in, tvb, 0, 0, curr->res_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
if (next && next->req_framenum) {
pi = proto_tree_add_uint(http_tree, hf_http_next_request_in, tvb, 0, 0, next->req_framenum);
PROTO_ITEM_SET_GENERATED(pi);
}
break;
case HTTP_OTHERS:
default:
break;
}
}
/* Give the follw tap what we've currently dissected */
if(have_tap_listener(http_follow_tap)) {
tap_queue_packet(http_follow_tap, pinfo, tvb_new_subset_length(tvb, 0, offset));
}
reported_datalen = tvb_reported_length_remaining(tvb, offset);
datalen = tvb_captured_length_remaining(tvb, offset);
/*
* If a content length was supplied, the amount of data to be
* processed as HTTP payload is the minimum of the content
* length and the amount of data remaining in the frame.
*
* If a message is received with both a Transfer-Encoding
* header field and a Content-Length header field, the latter
* MUST be ignored.
*
* If no content length was supplied (or if a bad content length
* was supplied), the amount of data to be processed is the amount
* of data remaining in the frame.
*
* If there was no Content-Length entity header, we should
* accumulate all data until the end of the connection.
* That'd require that the TCP dissector call subdissectors
* for all frames with FIN, even if they contain no data,
* which would require subdissectors to deal intelligently
* with empty segments.
*
* According to RFC 2616, however, 1xx responses, 204 responses,
* and 304 responses MUST NOT include a message body; if no
* content length is specified for them, we don't attempt to
* dissect the body.
*
* XXX - it says the same about responses to HEAD requests;
* unless there's a way to determine from the response
* whether it's a response to a HEAD request, we have to
* keep information about the request and associate that with
* the response in order to handle that.
*/
if (headers.have_content_length &&
headers.transfer_encoding == HTTP_TE_NONE) {
if (datalen > headers.content_length)
datalen = (int)headers.content_length;
/*
* XXX - limit the reported length in the tvbuff we'll
* hand to a subdissector to be no greater than the
* content length.
*
* We really need both unreassembled and "how long it'd
* be if it were reassembled" lengths for tvbuffs, so
* that we throw the appropriate exceptions for
* "not enough data captured" (running past the length),
* "packet needed reassembly" (within the length but
* running past the unreassembled length), and
* "packet is malformed" (running past the reassembled
* length).
*/
if (reported_datalen > headers.content_length)
reported_datalen = (int)headers.content_length;
} else {
switch (http_type) {
case HTTP_REQUEST:
/*
* Requests have no content if there's no
* Content-Length header and no Transfer-Encoding
* header.
*/
if (headers.transfer_encoding == HTTP_TE_NONE)
datalen = 0;
else
reported_datalen = -1;
break;
case HTTP_RESPONSE:
if ((stat_info->response_code/100) == 1 ||
stat_info->response_code == 204 ||
stat_info->response_code == 304)
datalen = 0; /* no content! */
else {
/*
* XXX - responses to HEAD requests,
* and possibly other responses,
* "MUST NOT" include a
* message-body.
*/
reported_datalen = -1;
}
break;
default:
/*
* XXX - what about HTTP_NOTIFICATION?
*/
reported_datalen = -1;
break;
}
}
if (datalen > 0) {
/*
* There's stuff left over; process it.
*/
tvbuff_t *next_tvb;
guint chunked_datalen = 0;
char *media_str = NULL;
const gchar *file_data;
/*
* Create a tvbuff for the payload.
*
* The amount of data to be processed that's
* available in the tvbuff is "datalen", which
* is the minimum of the amount of data left in
* the tvbuff and any specified content length.
*
* The amount of data to be processed that's in
* this frame, regardless of whether it was
* captured or not, is "reported_datalen",
* which, if no content length was specified,
* is -1, i.e. "to the end of the frame.
*/
next_tvb = tvb_new_subset(tvb, offset, datalen,
reported_datalen);
/*
* Handle *transfer* encodings.
*/
if (headers.transfer_encoding_chunked) {
if (!http_dechunk_body) {
/* Chunking disabled, cannot dissect further. */
call_data_dissector(next_tvb, pinfo, http_tree);
goto body_dissected;
}
chunked_datalen = chunked_encoding_dissector(
&next_tvb, pinfo, http_tree, 0);
if (chunked_datalen == 0) {
/*
* The chunks weren't reassembled,
* or there was a single zero
* length chunk.
*/
goto body_dissected;
} else {
/*
* Add a new data source for the
* de-chunked data.
*/
#if 0 /* Handled in chunked_encoding_dissector() */
tvb_set_child_real_data_tvbuff(tvb,
next_tvb);
#endif
add_new_data_source(pinfo, next_tvb,
"De-chunked entity body");
/* chunked-body might be smaller than
* datalen. */
datalen = chunked_datalen;
}
}
/* Handle other transfer codings after de-chunking. */
switch (headers.transfer_encoding) {
case HTTP_TE_COMPRESS:
case HTTP_TE_DEFLATE:
case HTTP_TE_GZIP:
/*
* We currently can't handle, for example, "gzip",
* "compress", or "deflate" as *transfer* encodings;
* just handle them as data for now.
*/
call_data_dissector(next_tvb, pinfo, http_tree);
goto body_dissected;
default:
/* Nothing to do for "identity" or when header is
* missing or invalid. */
break;
}
/*
* At this point, any chunked *transfer* coding has been removed
* (the entity body has been dechunked) so it can be presented
* for the following operation (*content* encoding), or it has
* been been handed off to the data dissector.
*
* Handle *content* encodings other than "identity" (which
* shouldn't appear in a Content-Encoding header, but
* we handle it in any case).
*/
if (headers.content_encoding != NULL &&
g_ascii_strcasecmp(headers.content_encoding, "identity") != 0) {
/*
* We currently don't handle, for example, "compress";
* just handle them as data for now.
*
* After July 7, 2004 the LZW patent expired, so
* support could be added. However, I don't think
* that anybody ever really implemented "compress",
* due to the aforementioned patent.
*/
tvbuff_t *uncomp_tvb = NULL;
proto_item *e_ti = NULL;
proto_tree *e_tree = NULL;
if (http_decompress_body &&
(g_ascii_strcasecmp(headers.content_encoding, "gzip") == 0 ||
g_ascii_strcasecmp(headers.content_encoding, "deflate") == 0 ||
g_ascii_strcasecmp(headers.content_encoding, "x-gzip") == 0 ||
g_ascii_strcasecmp(headers.content_encoding, "x-deflate") == 0))
{
uncomp_tvb = tvb_child_uncompress(tvb, next_tvb, 0,
tvb_captured_length(next_tvb));
}
/*
* Add the encoded entity to the protocol tree
*/
e_tree = proto_tree_add_subtree_format(http_tree, next_tvb,
0, tvb_captured_length(next_tvb), ett_http_encoded_entity, &e_ti,
"Content-encoded entity body (%s): %u bytes",
headers.content_encoding,
tvb_captured_length(next_tvb));
if (uncomp_tvb != NULL) {
/*
* Decompression worked
*/
/* XXX - Don't free this, since it's possible
* that the data was only partially
* decompressed, such as when desegmentation
* isn't enabled.
*
tvb_free(next_tvb);
*/
proto_item_append_text(e_ti, " -> %u bytes", tvb_captured_length(uncomp_tvb));
next_tvb = uncomp_tvb;
add_new_data_source(pinfo, next_tvb,
"Uncompressed entity body");
} else {
proto_item_append_text(e_ti, " [Error: Decompression failed]");
call_data_dissector(next_tvb, pinfo, e_tree);
goto body_dissected;
}
}
/*
* Note that a new data source is added for the entity body
* only if it was content-encoded and/or transfer-encoded.
*/
/* Save values for the Export Object GUI feature if we have
* an active listener to process it (which happens when
* the export object window is open). */
if(have_tap_listener(http_eo_tap)) {
eo_info = wmem_new(wmem_packet_scope(), http_eo_t);
eo_info->hostname = conv_data->http_host;
eo_info->filename = conv_data->request_uri;
eo_info->content_type = headers.content_type;
eo_info->payload_len = tvb_captured_length(next_tvb);
eo_info->payload_data = tvb_get_ptr(next_tvb, 0, eo_info->payload_len);
tap_queue_packet(http_eo_tap, pinfo, eo_info);
}
/* Save values for the Export Object GUI feature if we have
* an active listener to process it (which happens when
* the export object window is open). */
if(have_tap_listener(http_follow_tap)) {
tap_queue_packet(http_follow_tap, pinfo, next_tvb);
}
file_data = tvb_get_string_enc(wmem_packet_scope(), next_tvb, 0, tvb_reported_length(next_tvb), ENC_ASCII);
proto_tree_add_string_format_value(http_tree, hf_http_file_data,
next_tvb, 0, tvb_reported_length(next_tvb), file_data, "%u bytes", tvb_reported_length(next_tvb));
/*
* Do subdissector checks.
*
* First, if we have a Content-Type value, check whether
* there's a subdissector for that media type.
*/
handle = NULL;
if (headers.content_type != NULL) {
/*
* We didn't find any subdissector that
* registered for the port, and we have a
* Content-Type value. Is there any subdissector
* for that content type?
*/
if (headers.content_type_parameters)
media_str = wmem_strdup(wmem_packet_scope(), headers.content_type_parameters);
/*
* Calling the string handle for the media type
* dissector table will set pinfo->match_string
* to headers.content_type for us.
*/
pinfo->match_string = headers.content_type;
handle = dissector_get_string_handle(
media_type_subdissector_table,
headers.content_type);
if (handle == NULL &&
strncmp(headers.content_type, "multipart/", sizeof("multipart/")-1) == 0) {
/* Try to decode the unknown multipart subtype anyway */
handle = dissector_get_string_handle(
media_type_subdissector_table,
"multipart/");
}
}
/*
* Now, if we didn't find such a subdissector, check
* whether some subdissector asked that they be called
* if HTTP traffic was on some particular port. This
* handles protocols that use HTTP syntax but don't have
* a media type and instead use a specified port.
*/
if (handle == NULL) {
handle = dissector_get_uint_handle(port_subdissector_table,
pinfo->match_uint);
}
message_info.type = http_type;
message_info.media_str = media_str;
if (handle != NULL) {
/*
* We have a subdissector - call it.
*/
dissected = call_dissector_only(handle, next_tvb, pinfo, tree, &message_info);
if (!dissected)
expert_add_info(pinfo, http_tree, &ei_http_subdissector_failed);
}
if (!dissected) {
/*
* We don't have a subdissector or we have one and it did not
* dissect the payload - try the heuristic subdissectors.
*/
dissected = dissector_try_heuristic(heur_subdissector_list,
next_tvb, pinfo, tree, &hdtbl_entry, NULL);
}
if (dissected) {
/*
* The subdissector dissected the body.
* Fix up the top-level item so that it doesn't
* include the stuff for that protocol.
*/
if (ti != NULL)
proto_item_set_len(ti, offset);
} else {
if (headers.content_type != NULL) {
/*
* Calling the default media handle if there is a content-type that
* wasn't handled above.
*/
call_dissector_with_data(media_handle, next_tvb, pinfo, tree, &message_info);
} else {
/* Call the default data dissector */
call_data_dissector(next_tvb, pinfo, http_tree);
}
}
body_dissected:
/*
* We've processed "datalen" bytes worth of data
* (which may be no data at all); advance the
* offset past whatever data we've processed.
*/
offset += datalen;
}
if (http_type == HTTP_RESPONSE && conv_data->upgrade == UPGRADE_SSTP) {
conv_data->startframe = pinfo->num + 1;
headers.upgrade = conv_data->upgrade;
}
if (http_type == HTTP_RESPONSE && pinfo->desegment_offset<=0 && pinfo->desegment_len<=0) {
conv_data->upgrade = headers.upgrade;
conv_data->startframe = pinfo->num + 1;
copy_address_wmem(wmem_file_scope(), &conv_data->server_addr, &pinfo->src);
conv_data->server_port = pinfo->srcport;
}
tap_queue_packet(http_tap, pinfo, stat_info);
return offset - orig_offset;
}
/* This can be used to dissect an HTTP request until such time
* that a more complete dissector is written for that HTTP request.
* This simple dissector only puts the request method, URI, and
* protocol version into a sub-tree.
*/
static void
basic_request_dissector(tvbuff_t *tvb, proto_tree *tree, int offset,
const guchar *line, const guchar *lineend,
http_conv_t *conv_data)
{
const guchar *next_token;
const gchar *request_uri;
gchar *query_str, *parameter_str, *path_str;
int request_uri_len, query_str_len, parameter_str_len;
int tokenlen, query_offset, path_len;
proto_item *ti, *tj;
proto_tree *query_tree, *path_tree;
/* The first token is the method. */
tokenlen = get_token_len(line, lineend, &next_token);
if (tokenlen == 0)
return;
proto_tree_add_item(tree, hf_http_request_method, tvb, offset, tokenlen,
ENC_ASCII|ENC_NA);
if ((next_token - line) > 2 && next_token[-1] == ' ' && next_token[-2] == ' ') {
/* Two spaces in a now indicates empty URI, so roll back one here */
next_token--;
}
offset += (int) (next_token - line);
line = next_token;
/* The next token is the URI. */
tokenlen = get_token_len(line, lineend, &next_token);
/* Save the request URI for various later uses */
request_uri = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, tokenlen, ENC_ASCII);
stat_info->request_uri = wmem_strdup(wmem_packet_scope(), request_uri);
conv_data->request_uri = wmem_strdup(wmem_file_scope(), request_uri);
tj = proto_tree_add_string(tree, hf_http_request_uri, tvb, offset, tokenlen, request_uri);
if (( query_str = strchr(request_uri, '?')) != NULL) {
if (strlen(query_str) > 1) {
query_str++;
query_str_len = (int)strlen(query_str);
request_uri_len = (int)strlen(request_uri);
path_len = request_uri_len - query_str_len;
query_offset = offset + path_len;
path_tree = proto_item_add_subtree(tj, ett_http_request_path);
path_str = wmem_strndup(wmem_packet_scope(), request_uri, path_len-1);
proto_tree_add_string(path_tree, hf_http_request_path, tvb, offset, path_len-1, path_str);
ti = proto_tree_add_string(path_tree, hf_http_request_query, tvb, query_offset, query_str_len, query_str);
query_tree = proto_item_add_subtree(ti, ett_http_request_query);
for ( parameter_str = strtok(query_str, "&"); parameter_str; parameter_str = strtok(NULL, "&") ) {
parameter_str_len = (int) strlen(parameter_str);
proto_tree_add_string(query_tree, hf_http_request_query_parameter, tvb, query_offset, parameter_str_len, parameter_str);
query_offset += parameter_str_len + 1;
}
}
}
offset += (int) (next_token - line);
line = next_token;
/* Everything to the end of the line is the version. */
tokenlen = (int) (lineend - line);
proto_tree_add_item(tree, hf_http_version, tvb, offset, tokenlen,
ENC_ASCII|ENC_NA);
}
static void
basic_response_dissector(tvbuff_t *tvb, proto_tree *tree, int offset,
const guchar *line, const guchar *lineend,
http_conv_t *conv_data _U_)
{
const guchar *next_token;
int tokenlen;
gchar response_code_chars[4];
/*
* The first token is the HTTP Version.
*/
tokenlen = get_token_len(line, lineend, &next_token);
if (tokenlen == 0)
return;
proto_tree_add_item(tree, hf_http_version, tvb, offset, tokenlen,
ENC_ASCII|ENC_NA);
/* Advance to the start of the next token. */
offset += (int) (next_token - line);
line = next_token;
/*
* The second token is the Status Code.
*/
tokenlen = get_token_len(line, lineend, &next_token);
if (tokenlen < 3)
return;
/* The Status Code characters must be copied into a null-terminated
* buffer for strtoul() to parse them into an unsigned integer value.
*/
memcpy(response_code_chars, line, 3);
response_code_chars[3] = '\0';
stat_info->response_code = conv_data->response_code =
(guint)strtoul(response_code_chars, NULL, 10);
proto_tree_add_uint(tree, hf_http_response_code, tvb, offset, 3,
stat_info->response_code);
/* Advance to the start of the next token. */
offset += (int) (next_token - line);
line = next_token;
/*
* The remaining tokens in the line comprise the Reason Phrase.
*/
tokenlen = (int) (lineend - line);
if (tokenlen < 1)
return;
proto_tree_add_item(tree, hf_http_response_phrase, tvb, offset,
tokenlen, ENC_ASCII|ENC_NA);
}
#if 0 /* XXX: Replaced by code creating the "Dechunked" tvb O(N) rather than O(N^2) */
/*
* Dissect the http data chunks and add them to the tree.
*/
static int
chunked_encoding_dissector(tvbuff_t **tvb_ptr, packet_info *pinfo,
proto_tree *tree, int offset)
{
guint8 *chunk_string = NULL;
guint32 chunk_size = 0;
gint chunk_offset = 0;
guint32 datalen = 0;
gint linelen = 0;
gint chunks_decoded = 0;
tvbuff_t *tvb = NULL;
tvbuff_t *new_tvb = NULL;
gint chunked_data_size = 0;
proto_tree *subtree;
proto_item *ti;
if (tvb_ptr == NULL || *tvb_ptr == NULL) {
return 0;
}
tvb = *tvb_ptr;
datalen = tvb_reported_length_remaining(tvb, offset);
subtree = proto_tree_add_subtree(tree, tvb, offset, datalen,
ett_http_chunked_response, NULL, "HTTP chunked response");
while (datalen > 0) {
proto_item *chunk_ti = NULL, *chuck_size_item;
proto_tree *chunk_subtree = NULL;
tvbuff_t *data_tvb = NULL; /* */
gchar *c = NULL;
guint8 *raw_data;
gint raw_len = 0;
linelen = tvb_find_line_end(tvb, offset, -1, &chunk_offset, TRUE);
if (linelen <= 0) {
/* Can't get the chunk size line */
break;
}
chunk_string = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, linelen, ENC_ASCII);
if (chunk_string == NULL) {
/* Can't get the chunk size line */
break;
}
c = (gchar*) chunk_string;
/*
* We don't care about the extensions.
*/
if ((c = strchr(c, ';'))) {
*c = '\0';
}
chunk_size = (guint32)strtol((gchar*)chunk_string, NULL, 16);
if (chunk_size > datalen) {
/*
* The chunk size is more than what's in the tvbuff,
* so either the user hasn't enabled decoding, or all
* of the segments weren't captured.
*/
chunk_size = datalen;
}
#if 0
else if (new_tvb == NULL) {
new_tvb = tvb_new_composite();
}
if (new_tvb != NULL && chunk_size != 0) {
tvbuff_t *chunk_tvb = NULL;
chunk_tvb = tvb_new_subset(tvb, chunk_offset,
chunk_size, datalen);
tvb_composite_append(new_tvb, chunk_tvb);
}
#endif
chunked_data_size += chunk_size;
raw_data = g_malloc(chunked_data_size);
raw_len = 0;
if (new_tvb != NULL) {
raw_len = tvb_captured_length_remaining(new_tvb, 0);
tvb_memcpy(new_tvb, raw_data, 0, raw_len);
tvb_free(new_tvb);
}
tvb_memcpy(tvb, (guint8 *)(raw_data + raw_len),
chunk_offset, chunk_size);
/* Don't create a new tvb if we have a single chunk with
* a size of zero (meaning it is the end of the chunks). */
if(chunked_data_size > 0) {
new_tvb = tvb_new_real_data(raw_data,
chunked_data_size, chunked_data_size);
tvb_set_free_cb(new_tvb, g_free);
}
if (subtree) {
if(chunk_size == 0) {
chunk_subtree = proto_tree_add_subtree(subtree, tvb,
offset, chunk_offset - offset + chunk_size + 2,
ett_http_chunk_data, NULL, "End of chunked encoding");
} else {
chunk_subtree = proto_tree_add_subtree_format(subtree, tvb,
offset,
chunk_offset - offset + chunk_size + 2,
ett_http_chunk_data, NULL, "Data chunk (%u octets)", chunk_size);
}
chuck_size_item = proto_tree_add_uint_format_value(chunk_subtree, hf_http_chunk_size, tvb, offset,
1, chunk_size, "%u octets", chunk_size);
proto_item_set_len(chuck_size_item, chunk_offset - offset);
/*
* XXX - just add the chunk's data as an item?
*
* Using the data dissector means that, in
* TShark, you get the entire chunk dumped
* out in hex, in addition to whatever
* dissection is done on the reassembled data.
*/
data_tvb = tvb_new_subset_length(tvb, chunk_offset, chunk_size);
call_data_dissector(data_tvb, pinfo, chunk_subtree);
proto_tree_add_item(chunk_subtree, hf_http_chunked_boundary, tvb,
chunk_offset + chunk_size, 2, ENC_NA);
}
chunks_decoded++;
offset = chunk_offset + chunk_size + 2;
datalen = tvb_reported_length_remaining(tvb, offset);
}
if (new_tvb != NULL) {
/* Placeholder for the day that composite tvbuffer's will work.
tvb_composite_finalize(new_tvb);
/ * tvb_set_reported_length(new_tvb, chunked_data_size); * /
*/
/*
* XXX - Don't free this, since the tvbuffer that was passed
* may be used if the data spans multiple frames and reassembly
* isn't enabled.
*
tvb_free(*tvb_ptr);
*/
*tvb_ptr = new_tvb;
} else {
/*
* We didn't create a new tvb, so don't allow sub dissectors
* try to decode the non-existent entity body.
*/
chunks_decoded = -1;
}
return chunks_decoded;
}
#else
/*
* Dissect the http data chunks and add them to the tree.
*/
static guint
chunked_encoding_dissector(tvbuff_t **tvb_ptr, packet_info *pinfo,
proto_tree *tree, int offset)
{
tvbuff_t *tvb;
guint32 datalen;
guint32 orig_datalen;
gint chunked_data_size;
proto_tree *subtree;
proto_item *pi_chunked = NULL;
guint8 *raw_data;
gint raw_len;
if ((tvb_ptr == NULL) || (*tvb_ptr == NULL)) {
return 0;
}
tvb = *tvb_ptr;
datalen = tvb_reported_length_remaining(tvb, offset);
subtree = proto_tree_add_subtree(tree, tvb, offset, datalen,
ett_http_chunked_response, &pi_chunked,
"HTTP chunked response");
/* Dechunk the "chunked response" to a new memory buffer */
orig_datalen = datalen;
raw_data = (guint8 *)wmem_alloc(pinfo->pool, datalen);
raw_len = 0;
chunked_data_size = 0;
while (datalen > 0) {
tvbuff_t *data_tvb;
guint32 chunk_size;
gint chunk_offset;
guint8 *chunk_string;
gint linelen;
gchar *c;
linelen = tvb_find_line_end(tvb, offset, -1, &chunk_offset, TRUE);
if (linelen <= 0) {
/* Can't get the chunk size line */
break;
}
chunk_string = tvb_get_string_enc(wmem_packet_scope(), tvb, offset, linelen, ENC_ASCII);
if (chunk_string == NULL) {
/* Can't get the chunk size line */
break;
}
c = (gchar*)chunk_string;
/*
* We don't care about the extensions.
*/
if ((c = strchr(c, ';'))) {
*c = '\0';
}
chunk_size = (guint32)strtol((gchar*)chunk_string, NULL, 16);
if (chunk_size > datalen) {
/*
* The chunk size is more than what's in the tvbuff,
* so either the user hasn't enabled decoding, or all
* of the segments weren't captured.
*/
chunk_size = datalen;
}
chunked_data_size += chunk_size;
DISSECTOR_ASSERT((raw_len+chunk_size) <= orig_datalen);
tvb_memcpy(tvb, (guint8 *)(raw_data + raw_len), chunk_offset, chunk_size);
raw_len += chunk_size;
if (subtree) {
proto_tree *chunk_subtree;
proto_item *chunk_size_item;
if(chunk_size == 0) {
chunk_subtree = proto_tree_add_subtree(subtree, tvb,
offset,
chunk_offset - offset + chunk_size + 2,
ett_http_chunk_data, NULL,
"End of chunked encoding");
} else {
chunk_subtree = proto_tree_add_subtree_format(subtree, tvb,
offset,
chunk_offset - offset + chunk_size + 2,
ett_http_chunk_data, NULL,
"Data chunk (%u octets)", chunk_size);
}
chunk_size_item = proto_tree_add_uint_format_value(chunk_subtree, hf_http_chunk_size, tvb, offset,
1, chunk_size, "%u octets", chunk_size);
proto_item_set_len(chunk_size_item, chunk_offset - offset);
/* last-chunk does not have chunk-data CRLF. */
if (chunk_size > 0) {
/*
* XXX - just add the chunk's data as an item?
*
* Using the data dissector means that, in
* TShark, you get the entire chunk dumped
* out in hex, in addition to whatever
* dissection is done on the reassembled data.
*/
data_tvb = tvb_new_subset_length(tvb, chunk_offset, chunk_size);
call_data_dissector(data_tvb, pinfo, chunk_subtree);
proto_tree_add_item(chunk_subtree, hf_http_chunk_boundary, tvb,
chunk_offset + chunk_size, 2, ENC_NA);
}
}
offset = chunk_offset + chunk_size; /* beginning of next chunk */
if (chunk_size > 0) offset += 2; /* CRLF of chunk */
datalen = tvb_reported_length_remaining(tvb, offset);
/* This is the last chunk */
if (chunk_size == 0) {
/* Check for: trailer-part CRLF.
* trailer-part = *( header-field CRLF ) */
gint trailer_offset = offset, trailer_len;
gint header_field_len;
/* Skip all header-fields. */
do {
trailer_len = trailer_offset - offset;
header_field_len = tvb_find_line_end(tvb,
trailer_offset,
datalen - trailer_len,
&trailer_offset, TRUE);
} while (header_field_len > 0);
if (trailer_len > 0) {
proto_tree_add_item(subtree,
hf_http_chunked_trailer_part,
tvb, offset, trailer_len, ENC_ASCII|ENC_NA);
offset += trailer_len;
datalen -= trailer_len;
}
/* last CRLF of chunked-body is found. */
if (header_field_len == 0) {
proto_tree_add_format_text(subtree, tvb, offset,
trailer_offset - offset);
datalen -= trailer_offset - offset;
}
break;
}
}
/* datalen is the remaining bytes that are available for consumption. If
* smaller than orig_datalen, then bytes were consumed. */
if (datalen < orig_datalen) {
tvbuff_t *new_tvb;
proto_item_set_len(pi_chunked, orig_datalen - datalen);
new_tvb = tvb_new_child_real_data(tvb, raw_data, chunked_data_size, chunked_data_size);
*tvb_ptr = new_tvb;
}
/* Size of chunked-body or 0 if none was found. */
return orig_datalen - datalen;
}
#endif
static gboolean
conversation_dissector_is_http(conversation_t *conv, guint32 frame_num)
{
dissector_handle_t conv_handle;
if (conv == NULL)
return FALSE;
conv_handle = conversation_get_dissector(conv, frame_num);
return conv_handle == http_handle ||
conv_handle == http_tcp_handle ||
conv_handle == http_sctp_handle;
}
/* Call a subdissector to handle HTTP CONNECT's traffic */
static void
http_payload_subdissector(tvbuff_t *tvb, proto_tree *tree,
packet_info *pinfo, http_conv_t *conv_data, void* data)
{
guint32 *ptr = NULL;
guint32 uri_port, saved_port, srcport, destport;
gchar **strings; /* An array for splitting the request URI into hostname and port */
proto_item *item;
proto_tree *proxy_tree;
conversation_t *conv;
gboolean from_server = pinfo->srcport == conv_data->server_port &&
addresses_equal(&conv_data->server_addr, &pinfo->src);
/* Grab the destination port number from the request URI to find the right subdissector */
strings = g_strsplit(conv_data->request_uri, ":", 2);
if(strings[0] != NULL && strings[1] != NULL) {
/*
* The string was successfully split in two
* Create a proxy-connect subtree
*/
if(tree) {
item = proto_tree_add_item(tree, proto_http, tvb, 0, -1, ENC_NA);
proxy_tree = proto_item_add_subtree(item, ett_http);
item = proto_tree_add_string(proxy_tree, hf_http_proxy_connect_host,
tvb, 0, 0, strings[0]);
PROTO_ITEM_SET_GENERATED(item);
item = proto_tree_add_uint(proxy_tree, hf_http_proxy_connect_port,
tvb, 0, 0, (guint32)strtol(strings[1], NULL, 10) );
PROTO_ITEM_SET_GENERATED(item);
}
uri_port = (int)strtol(strings[1], NULL, 10); /* Convert string to a base-10 integer */
if (!from_server) {
srcport = pinfo->srcport;
destport = uri_port;
} else {
srcport = uri_port;
destport = pinfo->destport;
}
conv = find_conversation(pinfo->num, &pinfo->src, &pinfo->dst, PT_TCP, srcport, destport, 0);
/* We may get stuck in a recursion loop if we let process_tcp_payload() call us.
* So, if the port in the URI is one we're registered for or we have set up a
* conversation (e.g., one we detected heuristically or via Decode-As) call the data
* dissector directly.
*/
if (value_is_in_range(http_tcp_range, uri_port) ||
conversation_dissector_is_http(conv, pinfo->num)) {
call_data_dissector(tvb, pinfo, tree);
} else {
/* set pinfo->{src/dst port} and call the TCP sub-dissector lookup */
if (!from_server)
ptr = &pinfo->destport;
else
ptr = &pinfo->srcport;
/* Increase pinfo->can_desegment because we are traversing
* http and want to preserve desegmentation functionality for
* the proxied protocol
*/
if( pinfo->can_desegment>0 )
pinfo->can_desegment++;
saved_port = *ptr;
*ptr = uri_port;
decode_tcp_ports(tvb, 0, pinfo, tree,
pinfo->srcport, pinfo->destport, NULL,
(struct tcpinfo *)data);
*ptr = saved_port;
}
}
g_strfreev(strings); /* Free the result of g_strsplit() above */
}
/*
* XXX - this won't handle HTTP 0.9 replies, but they're all data
* anyway.
*/
static int
is_http_request_or_reply(const gchar *data, int linelen, http_type_t *type,
ReqRespDissector *reqresp_dissector,
http_conv_t *conv_data)
{
int isHttpRequestOrReply = FALSE;
/*
* From RFC 2774 - An HTTP Extension Framework
*
* Support the command prefix that identifies the presence of
* a "mandatory" header.
*/
if (linelen >= 2 && strncmp(data, "M-", 2) == 0) {
data += 2;
linelen -= 2;
}
/*
* From draft-cohen-gena-client-01.txt, available from the uPnP forum:
* NOTIFY, SUBSCRIBE, UNSUBSCRIBE
*
* From draft-ietf-dasl-protocol-00.txt, a now vanished Microsoft draft:
* SEARCH
*/
if (linelen >= 5 && strncmp(data, "HTTP/", 5) == 0) {
*type = HTTP_RESPONSE;
isHttpRequestOrReply = TRUE; /* response */
if (reqresp_dissector)
*reqresp_dissector = basic_response_dissector;
} else {
const guchar * ptr = (const guchar *)data;
int indx = 0;
/* Look for the space following the Method */
while (indx < linelen) {
if (*ptr == ' ')
break;
else {
ptr++;
indx++;
}
}
/* Check the methods that have same length */
switch (indx) {
case 3:
if (strncmp(data, "GET", indx) == 0 ||
strncmp(data, "PUT", indx) == 0) {
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
else if (strncmp(data, "ICY", indx) == 0) {
*type = HTTP_RESPONSE;
isHttpRequestOrReply = TRUE;
}
break;
case 4:
if (strncmp(data, "COPY", indx) == 0 ||
strncmp(data, "HEAD", indx) == 0 ||
strncmp(data, "LOCK", indx) == 0 ||
strncmp(data, "MOVE", indx) == 0 ||
strncmp(data, "POLL", indx) == 0 ||
strncmp(data, "POST", indx) == 0) {
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 5:
if (strncmp(data, "BCOPY", indx) == 0 ||
strncmp(data, "BMOVE", indx) == 0 ||
strncmp(data, "MKCOL", indx) == 0 ||
strncmp(data, "TRACE", indx) == 0 ||
strncmp(data, "PATCH", indx) == 0 || /* RFC 5789 */
strncmp(data, "LABEL", indx) == 0 || /* RFC 3253 8.2 */
strncmp(data, "MERGE", indx) == 0) { /* RFC 3253 11.2 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 6:
if (strncmp(data, "DELETE", indx) == 0 ||
strncmp(data, "SEARCH", indx) == 0 ||
strncmp(data, "UNLOCK", indx) == 0 ||
strncmp(data, "REPORT", indx) == 0 || /* RFC 3253 3.6 */
strncmp(data, "UPDATE", indx) == 0) { /* RFC 3253 7.1 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
else if (strncmp(data, "NOTIFY", indx) == 0) {
*type = HTTP_NOTIFICATION;
isHttpRequestOrReply = TRUE;
}
break;
case 7:
if (strncmp(data, "BDELETE", indx) == 0 ||
strncmp(data, "CONNECT", indx) == 0 ||
strncmp(data, "OPTIONS", indx) == 0 ||
strncmp(data, "CHECKIN", indx) == 0) { /* RFC 3253 4.4, 9.4 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 8:
if (strncmp(data, "PROPFIND", indx) == 0 ||
strncmp(data, "CHECKOUT", indx) == 0 || /* RFC 3253 4.3, 9.3 */
strncmp(data, "CCM_POST", indx) == 0) {
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 9:
if (strncmp(data, "SUBSCRIBE", indx) == 0) {
*type = HTTP_NOTIFICATION;
isHttpRequestOrReply = TRUE;
} else if (strncmp(data, "PROPPATCH", indx) == 0 ||
strncmp(data, "BPROPFIND", indx) == 0) {
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 10:
if (strncmp(data, "BPROPPATCH", indx) == 0 ||
strncmp(data, "UNCHECKOUT", indx) == 0 || /* RFC 3253 4.5 */
strncmp(data, "MKACTIVITY", indx) == 0) { /* RFC 3253 13.5 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 11:
if (strncmp(data, "MKWORKSPACE", indx) == 0 || /* RFC 3253 6.3 */
strncmp(data, "RPC_CONNECT", indx) == 0 || /* [MS-RPCH] 2.1.1.1.1 */
strncmp(data, "RPC_IN_DATA", indx) == 0) { /* [MS-RPCH] 2.1.2.1.1 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
} else if (strncmp(data, "UNSUBSCRIBE", indx) == 0) {
*type = HTTP_NOTIFICATION;
isHttpRequestOrReply = TRUE;
}
break;
case 12:
if (strncmp(data, "RPC_OUT_DATA", indx) == 0) { /* [MS-RPCH] 2.1.2.1.2 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 15:
if (strncmp(data, "VERSION-CONTROL", indx) == 0) { /* RFC 3253 3.5 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
}
break;
case 16:
if (strncmp(data, "BASELINE-CONTROL", indx) == 0) { /* RFC 3253 12.6 */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
} else if (strncmp(data, "SSTP_DUPLEX_POST", indx) == 0) { /* MS SSTP */
*type = HTTP_REQUEST;
isHttpRequestOrReply = TRUE;
conv_data->upgrade = UPGRADE_SSTP;
}
break;
default:
break;
}
if (isHttpRequestOrReply && reqresp_dissector) {
*reqresp_dissector = basic_request_dissector;
stat_info->request_method = wmem_strndup(wmem_packet_scope(), data, indx);
conv_data->request_method = wmem_strndup(wmem_file_scope(), data, indx);
}
}
return isHttpRequestOrReply;
}
/*
* Process headers.
*/
typedef struct {
const char *name;
gint *hf;
int special;
} header_info;
#define HDR_NO_SPECIAL 0
#define HDR_AUTHORIZATION 1
#define HDR_AUTHENTICATE 2
#define HDR_CONTENT_TYPE 3
#define HDR_CONTENT_LENGTH 4
#define HDR_CONTENT_ENCODING 5
#define HDR_TRANSFER_ENCODING 6
#define HDR_HOST 7
#define HDR_UPGRADE 8
#define HDR_COOKIE 9
#define HDR_WEBSOCKET_PROTOCOL 10
static const header_info headers[] = {
{ "Authorization", &hf_http_authorization, HDR_AUTHORIZATION },
{ "Proxy-Authorization", &hf_http_proxy_authorization, HDR_AUTHORIZATION },
{ "Proxy-Authenticate", &hf_http_proxy_authenticate, HDR_AUTHENTICATE },
{ "WWW-Authenticate", &hf_http_www_authenticate, HDR_AUTHENTICATE },
{ "Content-Type", &hf_http_content_type, HDR_CONTENT_TYPE },
{ "Content-Length", &hf_http_content_length_header, HDR_CONTENT_LENGTH },
{ "Content-Encoding", &hf_http_content_encoding, HDR_CONTENT_ENCODING },
{ "Transfer-Encoding", &hf_http_transfer_encoding, HDR_TRANSFER_ENCODING },
{ "Upgrade", &hf_http_upgrade, HDR_UPGRADE },
{ "User-Agent", &hf_http_user_agent, HDR_NO_SPECIAL },
{ "Host", &hf_http_host, HDR_HOST },
{ "Connection", &hf_http_connection, HDR_NO_SPECIAL },
{ "Cookie", &hf_http_cookie, HDR_COOKIE },
{ "Accept", &hf_http_accept, HDR_NO_SPECIAL },
{ "Referer", &hf_http_referer, HDR_NO_SPECIAL },
{ "Accept-Language", &hf_http_accept_language, HDR_NO_SPECIAL },
{ "Accept-Encoding", &hf_http_accept_encoding, HDR_NO_SPECIAL },
{ "Date", &hf_http_date, HDR_NO_SPECIAL },
{ "Cache-Control", &hf_http_cache_control, HDR_NO_SPECIAL },
{ "Server", &hf_http_server, HDR_NO_SPECIAL },
{ "Location", &hf_http_location, HDR_NO_SPECIAL },
{ "Sec-WebSocket-Accept", &hf_http_sec_websocket_accept, HDR_NO_SPECIAL },
{ "Sec-WebSocket-Extensions", &hf_http_sec_websocket_extensions, HDR_NO_SPECIAL },
{ "Sec-WebSocket-Key", &hf_http_sec_websocket_key, HDR_NO_SPECIAL },
{ "Sec-WebSocket-Protocol", &hf_http_sec_websocket_protocol, HDR_WEBSOCKET_PROTOCOL },
{ "Sec-WebSocket-Version", &hf_http_sec_websocket_version, HDR_NO_SPECIAL },
{ "Set-Cookie", &hf_http_set_cookie, HDR_NO_SPECIAL },
{ "Last-Modified", &hf_http_last_modified, HDR_NO_SPECIAL },
{ "X-Forwarded-For", &hf_http_x_forwarded_for, HDR_NO_SPECIAL },
};
/*
* Look up a header name (assume lower-case header_name).
*/
static gint*
get_hf_for_header(char* header_name)
{
gint* hf_id = NULL;
if (header_fields_hash) {
hf_id = (gint*) g_hash_table_lookup(header_fields_hash, header_name);
} else {
hf_id = NULL;
}
return hf_id;
}
/*
*
*/
static void
header_fields_initialize_cb(void)
{
static hf_register_info* hf;
gint* hf_id;
guint i;
gchar* header_name;
gchar* header_name_key;
if (header_fields_hash && hf) {
guint hf_size = g_hash_table_size (header_fields_hash);
/* Deregister all fields */
for (i = 0; i < hf_size; i++) {
proto_deregister_field (proto_http, *(hf[i].p_id));
g_free (hf[i].p_id);
}
g_hash_table_destroy (header_fields_hash);
proto_add_deregistered_data (hf);
header_fields_hash = NULL;
}
if (num_header_fields) {
header_fields_hash = g_hash_table_new_full(g_str_hash, g_str_equal,
g_free, NULL);
hf = g_new0(hf_register_info, num_header_fields);
for (i = 0; i < num_header_fields; i++) {
hf_id = g_new(gint,1);
*hf_id = -1;
header_name = g_strdup(header_fields[i].header_name);
header_name_key = g_ascii_strdown(header_name, -1);
hf[i].p_id = hf_id;
hf[i].hfinfo.name = header_name;
hf[i].hfinfo.abbrev = g_strdup_printf("http.header.%s", header_name);
hf[i].hfinfo.type = FT_STRING;
hf[i].hfinfo.display = BASE_NONE;
hf[i].hfinfo.strings = NULL;
hf[i].hfinfo.bitmask = 0;
hf[i].hfinfo.blurb = g_strdup(header_fields[i].header_desc);
HFILL_INIT(hf[i]);
g_hash_table_insert(header_fields_hash, header_name_key, hf_id);
}
proto_register_field_array(proto_http, hf, num_header_fields);
}
}
/**
* Parses the transfer-coding, returning TRUE if everything was fully understood
* or FALSE when unknown names were encountered.
*/
static gboolean
http_parse_transfer_coding(const char *value, headers_t *eh_ptr)
{
gboolean is_fully_parsed = TRUE;
/* Mark header as set, but with unknown encoding. */
eh_ptr->transfer_encoding = HTTP_TE_UNKNOWN;
while (*value) {
/* skip OWS (SP / HTAB) and commas; stop at the end. */
while (*value == ' ' || *value == '\t' || *value == ',')
value++;
if (!*value)
break;
if (g_str_has_prefix(value, "chunked")) {
eh_ptr->transfer_encoding_chunked = TRUE;
value += sizeof("chunked") - 1;
continue;
}
/* For now assume that chunked can only combined with exactly
* one other (compression) encoding. Anything else is
* unsupported. */
if (eh_ptr->transfer_encoding != HTTP_TE_UNKNOWN) {
/* No more transfer codings are expected. */
is_fully_parsed = FALSE;
break;
}
if (g_str_has_prefix(value, "compress")) {
eh_ptr->transfer_encoding = HTTP_TE_COMPRESS;
value += sizeof("compress") - 1;
} else if (g_str_has_prefix(value, "deflate")) {
eh_ptr->transfer_encoding = HTTP_TE_DEFLATE;
value += sizeof("deflate") - 1;
} else if (g_str_has_prefix(value, "gzip")) {
eh_ptr->transfer_encoding = HTTP_TE_GZIP;
value += sizeof("gzip") - 1;
} else if (g_str_has_prefix(value, "identity")) {
eh_ptr->transfer_encoding = HTTP_TE_IDENTITY;
value += sizeof("identity") - 1;
} else if (g_str_has_prefix(value, "x-compress")) {
eh_ptr->transfer_encoding = HTTP_TE_COMPRESS;
value += sizeof("x-compress") - 1;
} else if (g_str_has_prefix(value, "x-gzip")) {
eh_ptr->transfer_encoding = HTTP_TE_GZIP;
value += sizeof("x-gzip") - 1;
} else {
/* Unknown transfer encoding, skip until next comma.
* Stop when no more names are found. */
is_fully_parsed = FALSE;
value = strchr(value, ',');
if (!value)
break;
}
}
return is_fully_parsed;
}
static void
process_header(tvbuff_t *tvb, int offset, int next_offset,
const guchar *line, int linelen, int colon_offset,
packet_info *pinfo, proto_tree *tree, headers_t *eh_ptr,
http_conv_t *conv_data, int http_type)
{
int len;
int line_end_offset;
int header_len;
gint hf_index;
guchar c;
int value_offset;
int value_len;
char *value;
char *header_name;
char *p;
guchar *up;
proto_item *hdr_item, *it;
int i;
int* hf_id;
len = next_offset - offset;
line_end_offset = offset + linelen;
header_len = colon_offset - offset;
header_name = wmem_ascii_strdown(wmem_packet_scope(), &line[0], header_len);
hf_index = find_header_hf_value(tvb, offset, header_len);
/*
* Skip whitespace after the colon.
*/
value_offset = colon_offset + 1;
while (value_offset < line_end_offset
&& ((c = line[value_offset - offset]) == ' ' || c == '\t'))
value_offset++;
/*
* Fetch the value.
*
* XXX - the line may well have a NUL in it. Wireshark should
* really treat strings extracted from packets as counted
* strings, so that NUL isn't any different from any other
* character. For now, we just allocate a buffer that's
* value_len+1 bytes long, copy value_len bytes, and stick
* in a NUL terminator, so that the buffer for value actually
* has value_len bytes in it.
*/
value_len = line_end_offset - value_offset;
value = (char *)wmem_alloc(wmem_packet_scope(), value_len+1);
memcpy(value, &line[value_offset - offset], value_len);
value[value_len] = '\0';
if (hf_index == -1) {
/*
* Not a header we know anything about.
* Check if a HF generated from UAT information exists.
*/
hf_id = get_hf_for_header(header_name);
if (tree) {
if (!hf_id) {
if (http_type == HTTP_REQUEST ||
http_type == HTTP_RESPONSE) {
it = proto_tree_add_item(tree,
http_type == HTTP_RESPONSE ?
hf_http_response_line :
hf_http_request_line,
tvb, offset, len,
ENC_NA|ENC_ASCII);
proto_item_set_text(it, "%s",
format_text(line, len));
} else {
gchar* str = format_text(line, len);
proto_tree_add_string_format(tree, hf_http_unknown_header, tvb, offset,
len, str, "%s", str);
}
} else {
proto_tree_add_string_format(tree,
*hf_id, tvb, offset, len,
value, "%s", format_text(line, len));
if (http_type == HTTP_REQUEST ||
http_type == HTTP_RESPONSE) {
it = proto_tree_add_item(tree,
http_type == HTTP_RESPONSE ?
hf_http_response_line :
hf_http_request_line,
tvb, offset, len,
ENC_NA|ENC_ASCII);
proto_item_set_text(it, "%s",
format_text(line, len));
PROTO_ITEM_SET_HIDDEN(it);
}
}
}
} else {
/*
* Add it to the protocol tree as a particular field,
* but display the line as is.
*/
if (tree) {
header_field_info *hfinfo;
guint32 tmp;
hfinfo = proto_registrar_get_nth(*headers[hf_index].hf);
switch(hfinfo->type){
case FT_UINT8:
case FT_UINT16:
case FT_UINT24:
case FT_UINT32:
case FT_INT8:
case FT_INT16:
case FT_INT24:
case FT_INT32:
tmp=(guint32)strtol(value, NULL, 10);
hdr_item = proto_tree_add_uint(tree, *headers[hf_index].hf, tvb, offset, len, tmp);
if (http_type == HTTP_REQUEST ||
http_type == HTTP_RESPONSE) {
it = proto_tree_add_item(tree,
http_type == HTTP_RESPONSE ?
hf_http_response_line :
hf_http_request_line,
tvb, offset, len,
ENC_NA|ENC_ASCII);
proto_item_set_text(it, "%d", tmp);
PROTO_ITEM_SET_HIDDEN(it);
}
break;
default:
hdr_item = proto_tree_add_string_format(tree,
*headers[hf_index].hf, tvb, offset, len,
value, "%s", format_text(line, len));
if (http_type == HTTP_REQUEST ||
http_type == HTTP_RESPONSE) {
it = proto_tree_add_item(tree,
http_type == HTTP_RESPONSE ?
hf_http_response_line :
hf_http_request_line,
tvb, offset, len,
ENC_NA|ENC_ASCII);
proto_item_set_text(it, "%s",
format_text(line, len));
PROTO_ITEM_SET_HIDDEN(it);
}
}
} else
hdr_item = NULL;
/*
* Do any special processing that particular headers
* require.
*/
switch (headers[hf_index].special) {
case HDR_AUTHORIZATION:
if (check_auth_ntlmssp(hdr_item, tvb, pinfo, value))
break; /* dissected NTLMSSP */
if (check_auth_basic(hdr_item, tvb, value))
break; /* dissected basic auth */
if (check_auth_citrixbasic(hdr_item, tvb, value, offset))
break; /* dissected citrix basic auth */
check_auth_kerberos(hdr_item, tvb, pinfo, value);
break;
case HDR_AUTHENTICATE:
if (check_auth_ntlmssp(hdr_item, tvb, pinfo, value))
break; /* dissected NTLMSSP */
check_auth_kerberos(hdr_item, tvb, pinfo, value);
break;
case HDR_CONTENT_TYPE:
eh_ptr->content_type = (gchar*) wmem_memdup(wmem_packet_scope(), (guint8*)value,value_len + 1);
for (i = 0; i < value_len; i++) {
c = value[i];
if (c == ';' || g_ascii_isspace(c)) {
/*
* End of subtype - either
* white space or a ";"
* separating the subtype from
* a parameter.
*/
break;
}
/*
* Map the character to lower case;
* content types are case-insensitive.
*/
eh_ptr->content_type[i] = g_ascii_tolower(eh_ptr->content_type[i]);
}
eh_ptr->content_type[i] = '\0';
/*
* Now find the start of the optional parameters;
* skip the optional white space and the semicolon
* if this has not been done before.
*/
i++;
while (i < value_len) {
c = eh_ptr->content_type[i];
if (c == ';' || g_ascii_isspace(c))
/* Skip till start of parameters */
i++;
else
break;
}
if (i < value_len)
eh_ptr->content_type_parameters = eh_ptr->content_type + i;
else
eh_ptr->content_type_parameters = NULL;
break;
case HDR_CONTENT_LENGTH:
errno = 0;
eh_ptr->content_length = g_ascii_strtoll(value, &p, 10);
up = (guchar *)p;
if (eh_ptr->content_length < 0 ||
p == value ||
errno == ERANGE ||
(*up != '\0' && !g_ascii_isspace(*up))) {
/*
* Content length not valid; pretend
* we don't have it.
*/
eh_ptr->have_content_length = FALSE;
} else {
proto_tree *header_tree;
proto_item *tree_item;
/*
* We do have a valid content length.
*/
eh_ptr->have_content_length = TRUE;
header_tree = proto_item_add_subtree(hdr_item, ett_http_header_item);
tree_item = proto_tree_add_uint64(header_tree, hf_http_content_length,
tvb, offset, len, eh_ptr->content_length);
PROTO_ITEM_SET_GENERATED(tree_item);
if (eh_ptr->transfer_encoding != HTTP_TE_NONE) {
expert_add_info(pinfo, hdr_item, &ei_http_te_and_length);
}
}
break;
case HDR_CONTENT_ENCODING:
eh_ptr->content_encoding = wmem_strndup(wmem_packet_scope(), value, value_len);
break;
case HDR_TRANSFER_ENCODING:
if (eh_ptr->have_content_length) {
expert_add_info(pinfo, hdr_item, &ei_http_te_and_length);
}
if (!http_parse_transfer_coding(value, eh_ptr)) {
expert_add_info(pinfo, hdr_item, &ei_http_te_unknown);
}
break;
case HDR_HOST:
stat_info->http_host = wmem_strndup(wmem_packet_scope(), value, value_len);
conv_data->http_host = wmem_strndup(wmem_file_scope(), value, value_len);
break;
case HDR_UPGRADE:
if (g_ascii_strncasecmp(value, "WebSocket", value_len) == 0) {
eh_ptr->upgrade = UPGRADE_WEBSOCKET;
}
/* Check if upgrade is HTTP 2.0 (Start with h2...) */
if ( (g_str_has_prefix(value, "h2")) == 1){
eh_ptr->upgrade = UPGRADE_HTTP2;
}
break;
case HDR_COOKIE:
if (hdr_item) {
proto_tree *cookie_tree;
char *part, *part_end;
int part_len;
cookie_tree = proto_item_add_subtree(hdr_item, ett_http_header_item);
for (i = 0; i < value_len; ) {
/* skip whitespace and ';' (terminates at '\0' or earlier) */
c = value[i];
while (c == ';' || g_ascii_isspace(c))
c = value[++i];
if (i >= value_len)
break;
/* find "cookie=foo " in "cookie=foo ; bar" */
part = value + i;
part_end = (char *)memchr(part, ';', value_len - i);
if (part_end)
part_len =(int)(part_end - part);
else
part_len = value_len - i;
/* finally add cookie to tree */
proto_tree_add_item(cookie_tree, hf_http_cookie_pair,
tvb, value_offset + i, part_len, ENC_NA|ENC_ASCII);
i += part_len;
}
}
break;
case HDR_WEBSOCKET_PROTOCOL:
if (http_type == HTTP_RESPONSE) {
conv_data->websocket_protocol = wmem_strndup(wmem_file_scope(), value, value_len);
}
break;
}
}
}
/* Returns index of header tag in headers */
static gint
find_header_hf_value(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 0; i < array_length(headers); i++) {
if (header_len == strlen(headers[i].name) &&
tvb_strncaseeql(tvb, offset,
headers[i].name, header_len) == 0)
return i;
}
return -1;
}
/*
* Dissect Microsoft's abomination called NTLMSSP over HTTP.
*/
static gboolean
check_auth_ntlmssp(proto_item *hdr_item, tvbuff_t *tvb, packet_info *pinfo, gchar *value)
{
static const char *ntlm_headers[] = {
"NTLM ",
"Negotiate ",
NULL
};
const char **header;
size_t hdrlen;
proto_tree *hdr_tree;
/*
* Check for NTLM credentials and challenge; those can
* occur with WWW-Authenticate.
*/
for (header = &ntlm_headers[0]; *header != NULL; header++) {
hdrlen = strlen(*header);
if (strncmp(value, *header, hdrlen) == 0) {
if (hdr_item != NULL) {
hdr_tree = proto_item_add_subtree(hdr_item,
ett_http_ntlmssp);
} else
hdr_tree = NULL;
value += hdrlen;
dissect_http_ntlmssp(tvb, pinfo, hdr_tree, value);
return TRUE;
}
}
return FALSE;
}
/*
* Dissect HTTP Basic authorization.
*/
static gboolean
check_auth_basic(proto_item *hdr_item, tvbuff_t *tvb, gchar *value)
{
static const char *basic_headers[] = {
"Basic ",
NULL
};
const char **header;
size_t hdrlen;
proto_tree *hdr_tree;
for (header = &basic_headers[0]; *header != NULL; header++) {
hdrlen = strlen(*header);
if (strncmp(value, *header, hdrlen) == 0) {
if (hdr_item != NULL) {
hdr_tree = proto_item_add_subtree(hdr_item,
ett_http_ntlmssp);
} else
hdr_tree = NULL;
value += hdrlen;
ws_base64_decode_inplace(value);
proto_tree_add_string(hdr_tree, hf_http_basic, tvb,
0, 0, value);
return TRUE;
}
}
return FALSE;
}
/*
* Dissect HTTP CitrixAGBasic authorization.
*/
static gboolean
check_auth_citrixbasic(proto_item *hdr_item, tvbuff_t *tvb, gchar *value, int offset)
{
static const char *basic_headers[] = {
"CitrixAGBasic ",
NULL
};
const char **header;
size_t hdrlen;
proto_tree *hdr_tree;
char *ch_ptr;
int data_len;
char *data_val;
proto_item *hidden_item;
proto_item *pi;
for (header = &basic_headers[0]; *header != NULL; header++) {
hdrlen = strlen(*header);
if (strncmp(value, *header, hdrlen) == 0) {
if (hdr_item != NULL) {
hdr_tree = proto_item_add_subtree(hdr_item,
ett_http_ntlmssp);
} else
hdr_tree = NULL;
value += hdrlen;
offset += (int)hdrlen + 15;
hidden_item = proto_tree_add_boolean(hdr_tree,
hf_http_citrix, tvb, 0, 0, 1);
PROTO_ITEM_SET_HIDDEN(hidden_item);
if(strncmp(value, "username=\"", 10) == 0) {
value += 10;
offset += 10;
ch_ptr = strchr(value, '"');
if ( ch_ptr != NULL ) {
data_len = (int)(ch_ptr - value + 1);
data_val = wmem_strndup(wmem_packet_scope(), value, data_len);
ws_base64_decode_inplace(data_val);
pi = proto_tree_add_string(hdr_tree, hf_http_citrix_user, tvb,
offset , data_len - 1, data_val);
PROTO_ITEM_SET_GENERATED(pi);
value += data_len;
offset += data_len;
}
}
if(strncmp(value, "; domain=\"", 10) == 0) {
value += 10;
offset += 10;
ch_ptr = strchr(value, '"');
if ( ch_ptr != NULL ) {
data_len = (int)(ch_ptr - value + 1);
data_val = wmem_strndup(wmem_packet_scope(), value, data_len);
ws_base64_decode_inplace(data_val);
pi = proto_tree_add_string(hdr_tree, hf_http_citrix_domain, tvb,
offset, data_len - 1, data_val);
PROTO_ITEM_SET_GENERATED(pi);
value += data_len;
offset += data_len;
}
}
if(strncmp(value, "; password=\"", 12) == 0) {
value += 12;
offset += 12;
ch_ptr = strchr(value, '"');
if ( ch_ptr != NULL ) {
data_len = (int)(ch_ptr - value + 1);
data_val = wmem_strndup(wmem_packet_scope(), value, data_len);
ws_base64_decode_inplace(data_val);
pi = proto_tree_add_string(hdr_tree, hf_http_citrix_passwd, tvb,
offset, data_len - 1, data_val);
PROTO_ITEM_SET_GENERATED(pi);
value += data_len;
offset += data_len;
}
}
if(strncmp(value, "; AGESessionId=\"", 16) == 0) {
value += 16;
offset += 16;
ch_ptr = strchr(value, '"');
if ( ch_ptr != NULL ) {
data_len = (int)(ch_ptr - value + 1);
data_val = wmem_strndup(wmem_packet_scope(), value, data_len);
ws_base64_decode_inplace(data_val);
pi = proto_tree_add_string(hdr_tree, hf_http_citrix_session, tvb,
offset, data_len - 1, data_val);
PROTO_ITEM_SET_GENERATED(pi);
}
}
return TRUE;
}
}
return FALSE;
}
static gboolean
check_auth_kerberos(proto_item *hdr_item, tvbuff_t *tvb, packet_info *pinfo, const gchar *value)
{
proto_tree *hdr_tree;
if (strncmp(value, "Kerberos ", 9) == 0) {
if (hdr_item != NULL) {
hdr_tree = proto_item_add_subtree(hdr_item, ett_http_kerberos);
} else
hdr_tree = NULL;
dissect_http_kerberos(tvb, pinfo, hdr_tree, value);
return TRUE;
}
return FALSE;
}
static void
dissect_http_on_stream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
http_conv_t *conv_data, gboolean end_of_stream)
{
int offset = 0;
int len;
dissector_handle_t next_handle = NULL;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
if (conv_data->upgrade == UPGRADE_WEBSOCKET && pinfo->num >= conv_data->startframe) {
next_handle = websocket_handle;
}
if (conv_data->upgrade == UPGRADE_HTTP2 && pinfo->num >= conv_data->startframe) {
next_handle = http2_handle;
}
if (conv_data->upgrade == UPGRADE_SSTP && conv_data->response_code == 200 && pinfo->num >= conv_data->startframe) {
next_handle = sstp_handle;
}
if (next_handle) {
/* Increase pinfo->can_desegment because we are traversing
* http and want to preserve desegmentation functionality for
* the proxied protocol
*/
if (pinfo->can_desegment > 0)
pinfo->can_desegment++;
call_dissector_only(next_handle, tvb_new_subset_remaining(tvb, offset), pinfo, tree, NULL);
break;
}
len = dissect_http_message(tvb, offset, pinfo, tree, conv_data, "HTTP", proto_http, end_of_stream);
if (len == -1)
break;
offset += len;
/*
* OK, we've set the Protocol and Info columns for the
* first HTTP message; set a fence so that subsequent
* HTTP messages don't overwrite the Info column.
*/
col_set_fence(pinfo->cinfo, COL_INFO);
}
}
static int
dissect_http_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
struct tcpinfo *tcpinfo = (struct tcpinfo *)data;
conversation_t *conversation;
http_conv_t *conv_data;
gboolean end_of_stream;
conv_data = get_http_conversation_data(pinfo, &conversation);
/* Call HTTP2 dissector directly when detected via heuristics, but not
* when it was upgraded (the conversation started with HTTP). */
if (conversation_get_proto_data(conversation, proto_http2) &&
conv_data->upgrade != UPGRADE_HTTP2) {
if (pinfo->can_desegment > 0)
pinfo->can_desegment++;
return call_dissector_only(http2_handle, tvb, pinfo, tree, data);
}
/*
* Check if this is proxied connection and if so, hand of dissection to the
* payload-dissector.
* Response code 200 means "OK" and strncmp() == 0 means the strings match exactly */
if(pinfo->num >= conv_data->startframe &&
conv_data->response_code == 200 &&
conv_data->request_method &&
strncmp(conv_data->request_method, "CONNECT", 7) == 0 &&
conv_data->request_uri) {
if(conv_data->startframe == 0 && !pinfo->fd->flags.visited)
conv_data->startframe = pinfo->num;
http_payload_subdissector(tvb, tree, pinfo, conv_data, data);
return tvb_captured_length(tvb);
}
end_of_stream = IS_TH_FIN(tcpinfo->flags);
dissect_http_on_stream(tvb, pinfo, tree, conv_data, end_of_stream);
return tvb_captured_length(tvb);
}
static gboolean
dissect_http_heur_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
gint offset = 0, next_offset, linelen;
conversation_t *conversation;
/* Check if we have a line terminated by CRLF
* Return the length of the line (not counting the line terminator at
* the end), or, if we don't find a line terminator:
*
* if "deseg" is true, return -1;
*/
linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, TRUE);
if((linelen == -1)||(linelen == 8)){
return FALSE;
}
/* Check if the line start or ends with the HTTP token */
if((tvb_strncaseeql(tvb, linelen-8, "HTTP/1.1", 8) == 0)||(tvb_strncaseeql(tvb, 0, "HTTP/1.1", 8) == 0)){
conversation = find_or_create_conversation(pinfo);
conversation_set_dissector_from_frame_number(conversation, pinfo->num, http_tcp_handle);
dissect_http_tcp(tvb, pinfo, tree, data);
return TRUE;
}
return FALSE;
}
static int
dissect_http_ssl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
conversation_t *conversation;
http_conv_t *conv_data;
conv_data = get_http_conversation_data(pinfo, &conversation);
/*
* XXX - we need to provide an end-of-stream indication.
*/
dissect_http_on_stream(tvb, pinfo, tree, conv_data, FALSE);
return tvb_captured_length(tvb);
}
static int
dissect_http_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
conversation_t *conversation;
http_conv_t *conv_data;
conv_data = get_http_conversation_data(pinfo, &conversation);
/*
* XXX - we need to provide an end-of-stream indication.
*/
dissect_http_on_stream(tvb, pinfo, tree, conv_data, FALSE);
return tvb_captured_length(tvb);
}
static int
dissect_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
conversation_t *conversation;
http_conv_t *conv_data;
conv_data = get_http_conversation_data(pinfo, &conversation);
/*
* XXX - what should be done about reassembly, pipelining, etc.
* here?
*/
dissect_http_on_stream(tvb, pinfo, tree, conv_data, FALSE);
return tvb_captured_length(tvb);
}
static int
dissect_ssdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
conversation_t *conversation;
http_conv_t *conv_data;
conv_data = get_http_conversation_data(pinfo, &conversation);
dissect_http_message(tvb, 0, pinfo, tree, conv_data, "SSDP", proto_ssdp, FALSE);
return tvb_captured_length(tvb);
}
static void
range_delete_http_ssl_callback(guint32 port) {
ssl_dissector_delete(port, http_ssl_handle);
}
static void
range_add_http_ssl_callback(guint32 port) {
ssl_dissector_add(port, http_ssl_handle);
}
static void reinit_http(void) {
dissector_delete_uint_range("tcp.port", http_tcp_range, http_tcp_handle);
g_free(http_tcp_range);
http_tcp_range = range_copy(global_http_tcp_range);
dissector_add_uint_range("tcp.port", http_tcp_range, http_tcp_handle);
dissector_delete_uint_range("sctp.port", http_sctp_range, http_sctp_handle);
g_free(http_sctp_range);
http_sctp_range = range_copy(global_http_sctp_range);
dissector_add_uint_range("sctp.port", http_sctp_range, http_sctp_handle);
range_foreach(http_ssl_range, range_delete_http_ssl_callback);
g_free(http_ssl_range);
http_ssl_range = range_copy(global_http_ssl_range);
range_foreach(http_ssl_range, range_add_http_ssl_callback);
}
void
proto_register_http(void)
{
static hf_register_info hf[] = {
{ &hf_http_notification,
{ "Notification", "http.notification",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"TRUE if HTTP notification", HFILL }},
{ &hf_http_response,
{ "Response", "http.response",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"TRUE if HTTP response", HFILL }},
{ &hf_http_request,
{ "Request", "http.request",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"TRUE if HTTP request", HFILL }},
{ &hf_http_response_number,
{ "Response number", "http.response_number",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_request_number,
{ "Request number", "http.request_number",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_basic,
{ "Credentials", "http.authbasic",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_citrix,
{ "Citrix AG Auth", "http.authcitrix",
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
"TRUE if CitrixAGBasic Auth", HFILL }},
{ &hf_http_citrix_user,
{ "Citrix AG Username", "http.authcitrix.user",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_citrix_domain,
{ "Citrix AG Domain", "http.authcitrix.domain",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_citrix_passwd,
{ "Citrix AG Password", "http.authcitrix.password",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_citrix_session,
{ "Citrix AG Session ID", "http.authcitrix.session",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_response_line,
{ "Response line", "http.response.line",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_request_line,
{ "Request line", "http.request.line",
FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_http_request_method,
{ "Request Method", "http.request.method",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Request Method", HFILL }},
{ &hf_http_request_uri,
{ "Request URI", "http.request.uri",
FT_STRING, STR_UNICODE, NULL, 0x0,
"HTTP Request-URI", HFILL }},
{ &hf_http_request_path,
{ "Request URI Path", "http.request.uri.path",
FT_STRING, STR_UNICODE, NULL, 0x0,
"HTTP Request-URI Path", HFILL }},
{ &hf_http_request_query,
{ "Request URI Query", "http.request.uri.query",
FT_STRING, STR_UNICODE, NULL, 0x0,
"HTTP Request-URI Query", HFILL }},
{ &hf_http_request_query_parameter,
{ "Request URI Query Parameter", "http.request.uri.query.parameter",
FT_STRING, STR_UNICODE, NULL, 0x0,
"HTTP Request-URI Query Parameter", HFILL }},
{ &hf_http_version,
{ "Request Version", "http.request.version",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Request HTTP-Version", HFILL }},
{ &hf_http_request_full_uri,
{ "Full request URI", "http.request.full_uri",
FT_STRING, BASE_NONE, NULL, 0x0,
"The full requested URI (including host name)", HFILL }},
{ &hf_http_response_code,
{ "Status Code", "http.response.code",
FT_UINT16, BASE_DEC, NULL, 0x0,
"HTTP Response Status Code", HFILL }},
{ &hf_http_response_phrase,
{ "Response Phrase", "http.response.phrase",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Response Reason Phrase", HFILL }},
{ &hf_http_authorization,
{ "Authorization", "http.authorization",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Authorization header", HFILL }},
{ &hf_http_proxy_authenticate,
{ "Proxy-Authenticate", "http.proxy_authenticate",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Proxy-Authenticate header", HFILL }},
{ &hf_http_proxy_authorization,
{ "Proxy-Authorization", "http.proxy_authorization",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Proxy-Authorization header", HFILL }},
{ &hf_http_proxy_connect_host,
{ "Proxy-Connect-Hostname", "http.proxy_connect_host",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Proxy Connect Hostname", HFILL }},
{ &hf_http_proxy_connect_port,
{ "Proxy-Connect-Port", "http.proxy_connect_port",
FT_UINT16, BASE_DEC, NULL, 0x0,
"HTTP Proxy Connect Port", HFILL }},
{ &hf_http_www_authenticate,
{ "WWW-Authenticate", "http.www_authenticate",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP WWW-Authenticate header", HFILL }},
{ &hf_http_content_type,
{ "Content-Type", "http.content_type",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Content-Type header", HFILL }},
{ &hf_http_content_length_header,
{ "Content-Length", "http.content_length_header",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Content-Length header", HFILL }},
{ &hf_http_content_length,
{ "Content length", "http.content_length",
FT_UINT64, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_content_encoding,
{ "Content-Encoding", "http.content_encoding",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Content-Encoding header", HFILL }},
{ &hf_http_transfer_encoding,
{ "Transfer-Encoding", "http.transfer_encoding",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Transfer-Encoding header", HFILL }},
{ &hf_http_upgrade,
{ "Upgrade", "http.upgrade",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Upgrade header", HFILL }},
{ &hf_http_user_agent,
{ "User-Agent", "http.user_agent",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP User-Agent header", HFILL }},
{ &hf_http_host,
{ "Host", "http.host",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Host", HFILL }},
{ &hf_http_connection,
{ "Connection", "http.connection",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Connection", HFILL }},
{ &hf_http_cookie,
{ "Cookie", "http.cookie",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Cookie", HFILL }},
{ &hf_http_cookie_pair,
{ "Cookie pair", "http.cookie_pair",
FT_STRING, BASE_NONE, NULL, 0x0,
"A name/value HTTP cookie pair", HFILL }},
{ &hf_http_accept,
{ "Accept", "http.accept",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Accept", HFILL }},
{ &hf_http_referer,
{ "Referer", "http.referer",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Referer", HFILL }},
{ &hf_http_accept_language,
{ "Accept-Language", "http.accept_language",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Accept Language", HFILL }},
{ &hf_http_accept_encoding,
{ "Accept Encoding", "http.accept_encoding",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Accept Encoding", HFILL }},
{ &hf_http_date,
{ "Date", "http.date",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Date", HFILL }},
{ &hf_http_cache_control,
{ "Cache-Control", "http.cache_control",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Cache Control", HFILL }},
{ &hf_http_server,
{ "Server", "http.server",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Server", HFILL }},
{ &hf_http_location,
{ "Location", "http.location",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Location", HFILL }},
{ &hf_http_sec_websocket_accept,
{ "Sec-WebSocket-Accept", "http.sec_websocket_accept",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_sec_websocket_extensions,
{ "Sec-WebSocket-Extensions", "http.sec_websocket_extensions",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_sec_websocket_key,
{ "Sec-WebSocket-Key", "http.sec_websocket_key",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_sec_websocket_protocol,
{ "Sec-WebSocket-Protocol", "http.sec_websocket_protocol",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_sec_websocket_version,
{ "Sec-WebSocket-Version", "http.sec_websocket_version",
FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_http_set_cookie,
{ "Set-Cookie", "http.set_cookie",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Set Cookie", HFILL }},
{ &hf_http_last_modified,
{ "Last-Modified", "http.last_modified",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP Last Modified", HFILL }},
{ &hf_http_x_forwarded_for,
{ "X-Forwarded-For", "http.x_forwarded_for",
FT_STRING, BASE_NONE, NULL, 0x0,
"HTTP X-Forwarded-For", HFILL }},
{ &hf_http_request_in,
{ "Request in frame", "http.request_in",
FT_FRAMENUM, BASE_NONE, FRAMENUM_TYPE(FT_FRAMENUM_REQUEST), 0,
"This packet is a response to the packet with this number", HFILL }},
{ &hf_http_response_in,
{ "Response in frame","http.response_in",
FT_FRAMENUM, BASE_NONE, FRAMENUM_TYPE(FT_FRAMENUM_RESPONSE), 0,
"This packet will be responded in the packet with this number", HFILL }},
{ &hf_http_next_request_in,
{ "Next request in frame", "http.next_request_in",
FT_FRAMENUM, BASE_NONE, NULL, 0,
"The next HTTP request starts in packet number", HFILL }},
{ &hf_http_next_response_in,
{ "Next response in frame","http.next_response_in",
FT_FRAMENUM, BASE_NONE, NULL, 0,
"The next HTTP response starts in packet number", HFILL }},
{ &hf_http_prev_request_in,
{ "Prev request in frame", "http.prev_request_in",
FT_FRAMENUM, BASE_NONE, NULL, 0,
"The previous HTTP request starts in packet number", HFILL }},
{ &hf_http_prev_response_in,
{ "Prev response in frame","http.prev_response_in",
FT_FRAMENUM, BASE_NONE, NULL, 0,
"The previous HTTP response starts in packet number", HFILL }},
{ &hf_http_time,
{ "Time since request", "http.time",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0,
"Time since the request was sent", HFILL }},
{ &hf_http_chunked_trailer_part,
{ "trailer-part", "http.chunked_trailer_part",
FT_STRING, BASE_NONE, NULL, 0,
"Optional trailer in a chunked body", HFILL }},
{ &hf_http_chunk_boundary,
{ "Chunk boundary", "http.chunk_boundary",
FT_BYTES, BASE_NONE, NULL, 0,
NULL, HFILL }},
{ &hf_http_chunk_size,
{ "Chunk size", "http.chunk_size",
FT_UINT32, BASE_DEC, NULL, 0,
NULL, HFILL }},
{ &hf_http_file_data,
{ "File Data", "http.file_data",
FT_STRING, STR_UNICODE, NULL, 0,
NULL, HFILL }},
{ &hf_http_unknown_header,
{ "Unknown header", "http.unknown_header",
FT_STRING, BASE_NONE, NULL, 0,
NULL, HFILL }},
};
static gint *ett[] = {
&ett_http,
&ett_http_ntlmssp,
&ett_http_kerberos,
&ett_http_request,
&ett_http_request_path,
&ett_http_request_query,
&ett_http_chunked_response,
&ett_http_chunk_data,
&ett_http_encoded_entity,
&ett_http_header_item
};
static ei_register_info ei[] = {
{ &ei_http_chat, { "http.chat", PI_SEQUENCE, PI_CHAT, "Formatted text", EXPFILL }},
{ &ei_http_te_and_length, { "http.te_and_length", PI_MALFORMED, PI_WARN, "The Content-Length and Transfer-Encoding header must not be set together", EXPFILL }},
{ &ei_http_te_unknown, { "http.te_unknown", PI_UNDECODED, PI_WARN, "Unknown transfer coding name in Transfer-Encoding header", EXPFILL }},
{ &ei_http_subdissector_failed, { "http.subdissector_failed", PI_MALFORMED, PI_NOTE, "HTTP body subdissector failed, trying heuristic subdissector", EXPFILL }},
{ &ei_http_ssl_port, { "http.ssl_port", PI_SECURITY, PI_WARN, "Unencrypted HTTP protocol detected over encrypted port, could indicate a dangerous misconfiguration.", EXPFILL }},
{ &ei_http_leading_crlf, { "http.leading_crlf", PI_MALFORMED, PI_ERROR, "Leading CRLF previous message in the stream may have extra CRLF", EXPFILL }},
};
/* UAT for header fields */
static uat_field_t custom_header_uat_fields[] = {
UAT_FLD_CSTRING(header_fields, header_name, "Header name", "HTTP header name"),
UAT_FLD_CSTRING(header_fields, header_desc, "Field desc", "Description of the value contained in the header"),
UAT_END_FIELDS
};
module_t *http_module;
expert_module_t* expert_http;
uat_t* headers_uat;
proto_http = proto_register_protocol("Hypertext Transfer Protocol", "HTTP", "http");
proto_ssdp = proto_register_protocol("Simple Service Discovery Protocol", "SSDP", "ssdp");
proto_register_field_array(proto_http, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_http = expert_register_protocol(proto_http);
expert_register_field_array(expert_http, ei, array_length(ei));
http_handle = register_dissector("http", dissect_http, proto_http);
http_tcp_handle = register_dissector("http-over-tcp", dissect_http_tcp, proto_http);
http_ssl_handle = register_dissector("http-over-tls", dissect_http_ssl, proto_http); /* RFC 2818 */
http_sctp_handle = register_dissector("http-over-sctp", dissect_http_sctp, proto_http);
http_module = prefs_register_protocol(proto_http, reinit_http);
prefs_register_bool_preference(http_module, "desegment_headers",
"Reassemble HTTP headers spanning multiple TCP segments",
"Whether the HTTP dissector should reassemble headers "
"of a request spanning multiple TCP segments. "
"To use this option, you must also enable "
"\"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
&http_desegment_headers);
prefs_register_bool_preference(http_module, "desegment_body",
"Reassemble HTTP bodies spanning multiple TCP segments",
"Whether the HTTP dissector should use the "
"\"Content-length:\" value, if present, to reassemble "
"the body of a request spanning multiple TCP segments, "
"and reassemble chunked data spanning multiple TCP segments. "
"To use this option, you must also enable "
"\"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
&http_desegment_body);
prefs_register_bool_preference(http_module, "dechunk_body",
"Reassemble chunked transfer-coded bodies",
"Whether to reassemble bodies of entities that are transferred "
"using the \"Transfer-Encoding: chunked\" method",
&http_dechunk_body);
#ifdef HAVE_ZLIB
prefs_register_bool_preference(http_module, "decompress_body",
"Uncompress entity bodies",
"Whether to uncompress entity bodies that are compressed "
"using \"Content-Encoding: \"",
&http_decompress_body);
#endif
prefs_register_obsolete_preference(http_module, "tcp_alternate_port");
range_convert_str(&global_http_tcp_range, TCP_DEFAULT_RANGE, 65535);
http_tcp_range = range_empty();
prefs_register_range_preference(http_module, "tcp.port", "TCP Ports",
"TCP Ports range",
&global_http_tcp_range, 65535);
range_convert_str(&global_http_sctp_range, SCTP_DEFAULT_RANGE, 65535);
http_sctp_range = range_empty();
prefs_register_range_preference(http_module, "sctp.port", "SCTP Ports",
"SCTP Ports range",
&global_http_sctp_range, 65535);
range_convert_str(&global_http_ssl_range, SSL_DEFAULT_RANGE, 65535);
http_ssl_range = range_empty();
prefs_register_range_preference(http_module, "ssl.port", "SSL/TLS Ports",
"SSL/TLS Ports range",
&global_http_ssl_range, 65535);
/* UAT */
headers_uat = uat_new("Custom HTTP Header Fields",
sizeof(header_field_t),
"custom_http_header_fields",
TRUE,
&header_fields,
&num_header_fields,
/* specifies named fields, so affects dissection
and the set of named fields */
UAT_AFFECTS_DISSECTION|UAT_AFFECTS_FIELDS,
NULL,
header_fields_copy_cb,
header_fields_update_cb,
header_fields_free_cb,
header_fields_initialize_cb,
custom_header_uat_fields
);
prefs_register_uat_preference(http_module, "custom_http_header_fields", "Custom HTTP header fields",
"A table to define custom HTTP header for which fields can be setup and used for filtering/data extraction etc.",
headers_uat);
/*
* Dissectors shouldn't register themselves in this table;
* instead, they should call "http_tcp_dissector_add()", and
* we'll register the port number they specify as a port
* for HTTP, and register them in our subdissector table.
*
* This only works for protocols such as IPP that run over
* HTTP on a specific non-HTTP port.
*/
port_subdissector_table = register_dissector_table("http.port",
"TCP port for protocols using HTTP", proto_http, FT_UINT16, BASE_DEC);
/*
* Dissectors can register themselves in this table.
* It's just "media_type", not "http.content_type", because
* it's an Internet media type, usable by other protocols as well.
*/
media_type_subdissector_table =
register_dissector_table("media_type",
"Internet media type", proto_http, FT_STRING, BASE_NONE);
/*
* Heuristic dissectors SHOULD register themselves in
* this table using the standard heur_dissector_add()
* function.
*/
heur_subdissector_list = register_heur_dissector_list("http", proto_http);
/*
* Register for tapping
*/
http_tap = register_tap("http"); /* HTTP statistics tap */
http_eo_tap = register_tap("http_eo"); /* HTTP Export Object tap */
http_follow_tap = register_tap("http_follow"); /* HTTP Follow tap */
register_follow_stream(proto_http, "http_follow", tcp_follow_conv_filter, tcp_follow_index_filter, tcp_follow_address_filter,
tcp_port_to_display, follow_tvb_tap_listener);
}
/*
* Called by dissectors for protocols that run atop HTTP/TCP.
*/
void
http_tcp_dissector_add(guint32 port, dissector_handle_t handle)
{
/*
* Register ourselves as the handler for that port number
* over TCP.
*/
dissector_add_uint("tcp.port", port, http_tcp_handle);
/*
* And register them in *our* table for that port.
*/
dissector_add_uint("http.port", port, handle);
}
void
http_tcp_port_add(guint32 port)
{
/*
* Register ourselves as the handler for that port number
* over TCP. We rely on our caller having registered
* themselves for the appropriate media type.
*/
dissector_add_uint("tcp.port", port, http_tcp_handle);
}
void
proto_reg_handoff_http(void)
{
dissector_handle_t ssdp_handle;
media_handle = find_dissector_add_dependency("media", proto_http);
websocket_handle = find_dissector_add_dependency("websocket", proto_http);
http2_handle = find_dissector("http2");
/*
* XXX - is there anything to dissect in the body of an SSDP
* request or reply? I.e., should there be an SSDP dissector?
*/
ssdp_handle = create_dissector_handle(dissect_ssdp, proto_ssdp);
dissector_add_uint("udp.port", UDP_PORT_SSDP, ssdp_handle);
ntlmssp_handle = find_dissector_add_dependency("ntlmssp", proto_http);
gssapi_handle = find_dissector_add_dependency("gssapi", proto_http);
sstp_handle = find_dissector_add_dependency("sstp", proto_http);
stats_tree_register("http", "http", "HTTP/Packet Counter", 0, http_stats_tree_packet, http_stats_tree_init, NULL );
stats_tree_register("http", "http_req", "HTTP/Requests", 0, http_req_stats_tree_packet, http_req_stats_tree_init, NULL );
stats_tree_register("http", "http_srv", "HTTP/Load Distribution",0, http_reqs_stats_tree_packet, http_reqs_stats_tree_init, NULL );
}
/*
* Content-Type: message/http
*/
static gint proto_message_http = -1;
static gint ett_message_http = -1;
static int
dissect_message_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *subtree;
proto_item *ti;
gint offset = 0, next_offset;
gint len;
col_append_str(pinfo->cinfo, COL_INFO, " (message/http)");
if (tree) {
ti = proto_tree_add_item(tree, proto_message_http,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_message_http);
while (tvb_offset_exists(tvb, offset)) {
len = tvb_find_line_end(tvb, offset,
tvb_ensure_captured_length_remaining(tvb, offset),
&next_offset, FALSE);
if (len == -1)
break;
proto_tree_add_format_text(subtree, tvb, offset, len);
offset = next_offset;
}
}
return tvb_captured_length(tvb);
}
void
proto_register_message_http(void)
{
static gint *ett[] = {
&ett_message_http,
};
proto_message_http = proto_register_protocol(
"Media Type: message/http",
"message/http",
"message-http"
);
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_message_http(void)
{
dissector_handle_t message_http_handle;
message_http_handle = create_dissector_handle(dissect_message_http,
proto_message_http);
dissector_add_string("media_type", "message/http", message_http_handle);
heur_dissector_add("tcp", dissect_http_heur_tcp, "HTTP over TCP", "http_tcp", proto_http, HEURISTIC_ENABLE);
proto_http2 = proto_get_id_by_filter_name("http2");
reinit_http();
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/