epan/dissectors/packet-http.c

   1 /* packet-http.c
   2  * Routines for HTTP packet disassembly
   3  * RFC 1945 (HTTP/1.0)
   4  * RFC 2616 (HTTP/1.1)
   5  *
   6  * Guy Harris <guy@alum.mit.edu>
   7  *
   8  * Copyright 2004, Jerry Talkington <jtalkington@users.sourceforge.net>
   9  * Copyright 2002, Tim Potter <tpot@samba.org>
  10  * Copyright 1999, Andrew Tridgell <tridge@samba.org>
  11  *
  12  * $Id$
  13  *
  14  * Wireshark - Network traffic analyzer
  15  * By Gerald Combs <gerald@wireshark.org>
  16  * Copyright 1998 Gerald Combs
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License
  20  * as published by the Free Software Foundation; either version 2
  21  * of the License, or (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  31  */
  32
  33 #ifdef HAVE_CONFIG_H
  34 #include "config.h"
  35 #endif
  36
  37 #include <string.h>
  38 #include <ctype.h>
  39
  40 #include <glib.h>
  41 #include <epan/conversation.h>
  42 #include <epan/packet.h>
  43 #include <epan/strutil.h>
  44 #include <epan/base64.h>
  45 #include <epan/emem.h>
  46 #include <epan/stats_tree.h>
  47 #include <epan/ws_strsplit.h>
  48
  49 #include <epan/req_resp_hdrs.h>
  50 #include "packet-http.h"
  51 #include "packet-tcp.h"
  52 #include <epan/prefs.h>
  53 #include <epan/expert.h>
  54
  55 typedef enum _http_type {
  56         HTTP_REQUEST,
  57         HTTP_RESPONSE,
  58         HTTP_NOTIFICATION,
  59         HTTP_OTHERS
  60 } http_type_t;
  61
  62 #include <epan/tap.h>
  63
  64 static int http_tap = -1;
  65
  66 static int proto_http = -1;
  67 static int hf_http_notification = -1;
  68 static int hf_http_response = -1;
  69 static int hf_http_request = -1;
  70 static int hf_http_basic = -1;
  71 static int hf_http_request_method = -1;
  72 static int hf_http_request_uri = -1;
  73 static int hf_http_version = -1;
  74 static int hf_http_response_code = -1;
  75 static int hf_http_authorization = -1;
  76 static int hf_http_proxy_authenticate = -1;
  77 static int hf_http_proxy_authorization = -1;
  78 static int hf_http_www_authenticate = -1;
  79 static int hf_http_content_type = -1;
  80 static int hf_http_content_length = -1;
  81 static int hf_http_content_encoding = -1;
  82 static int hf_http_transfer_encoding = -1;
  83 static int hf_http_user_agent = -1;
  84 static int hf_http_host = -1;
  85 static int hf_http_connection = -1;
  86 static int hf_http_cookie = -1;
  87 static int hf_http_accept = -1;
  88 static int hf_http_referer = -1;
  89 static int hf_http_accept_language = -1;
  90 static int hf_http_accept_encoding = -1;
  91 static int hf_http_date = -1;
  92 static int hf_http_cache_control = -1;
  93 static int hf_http_server = -1;
  94 static int hf_http_location = -1;
  95 static int hf_http_set_cookie = -1;
  96 static int hf_http_last_modified = -1;
  97 static int hf_http_x_forwarded_for = -1;
  98
  99 static gint ett_http = -1;
 100 static gint ett_http_ntlmssp = -1;
 101 static gint ett_http_request = -1;
 102 static gint ett_http_chunked_response = -1;
 103 static gint ett_http_chunk_data = -1;
 104 static gint ett_http_encoded_entity = -1;
 105
 106 static dissector_handle_t data_handle;
 107 static dissector_handle_t media_handle;
 108 static dissector_handle_t http_handle;
 109
 110 /*
 111  * desegmentation of HTTP headers
 112  * (when we are over TCP or another protocol providing the desegmentation API)
 113  */
 114 static gboolean http_desegment_headers = TRUE;
 115
 116 /*
 117  * desegmentation of HTTP bodies
 118  * (when we are over TCP or another protocol providing the desegmentation API)
 119  * TODO let the user filter on content-type the bodies he wants desegmented
 120  */
 121 static gboolean http_desegment_body = TRUE;
 122
 123 /*
 124  * De-chunking of content-encoding: chunk entity bodies.
 125  */
 126 static gboolean http_dechunk_body = TRUE;
 127
 128 /*
 129  * Decompression of zlib encoded entities.
 130  */
 131 #ifdef HAVE_LIBZ
 132 static gboolean http_decompress_body = TRUE;
 133 #else
 134 static gboolean http_decompress_body = FALSE;
 135 #endif
 136
 137
 138 #define TCP_PORT_HTTP                   80
 139 #define TCP_PORT_PROXY_HTTP             3128
 140 #define TCP_PORT_PROXY_ADMIN_HTTP       3132
 141 #define TCP_ALT_PORT_HTTP               8080
 142 #define TCP_RADAN_HTTP                  8088
 143 #define TCP_PORT_HKP                    11371
 144 #define TCP_PORT_DAAP                   3689
 145
 146 /*
 147  * SSDP is implemented atop HTTP (yes, it really *does* run over UDP).
 148  */
 149 #define TCP_PORT_SSDP                   1900
 150 #define UDP_PORT_SSDP                   1900
 151
 152 /*
 153  * tcp alternate port
 154  */
 155 static guint http_alternate_tcp_port = 0;
 156 static guint alternate_tcp_port = 0;
 157
 158 /*
 159  * Protocols implemented atop HTTP.
 160  */
 161 typedef enum {
 162         PROTO_HTTP,             /* just HTTP */
 163         PROTO_SSDP,             /* Simple Service Discovery Protocol */
 164         PROTO_DAAP              /* Digital Audio Access Protocol */
 165 } http_proto_t;
 166
 167 typedef void (*ReqRespDissector)(tvbuff_t*, proto_tree*, int, const guchar*,
 168     const guchar*);
 169
 170 /*
 171  * Structure holding information from headers needed by main
 172  * HTTP dissector code.
 173  */
 174 typedef struct {
 175         char    *content_type;
 176         char    *content_type_parameters;
 177         gboolean have_content_length;
 178         long    content_length; /* XXX - make it 64-bit? */
 179         char    *content_encoding;
 180         char    *transfer_encoding;
 181 } headers_t;
 182
 183 static int is_http_request_or_reply(const gchar *data, int linelen,
 184     http_type_t *type, ReqRespDissector *reqresp_dissector);
 185 static int chunked_encoding_dissector(tvbuff_t **tvb_ptr, packet_info *pinfo,
 186                 proto_tree *tree, int offset);
 187 static void http_payload_subdissector(tvbuff_t *next_tvb, proto_tree *tree, proto_tree *sub_tree, packet_info *pinfo);
 188 static void process_header(tvbuff_t *tvb, int offset, int next_offset,
 189     const guchar *line, int linelen, int colon_offset, packet_info *pinfo,
 190     proto_tree *tree, headers_t *eh_ptr);
 191 static gint find_header_hf_value(tvbuff_t *tvb, int offset, guint header_len);
 192 static gboolean check_auth_ntlmssp(proto_item *hdr_item, tvbuff_t *tvb,
 193     packet_info *pinfo, gchar *value);
 194 static gboolean check_auth_basic(proto_item *hdr_item, tvbuff_t *tvb,
 195     gchar *value);
 196
 197 static dissector_table_t port_subdissector_table;
 198 static dissector_table_t media_type_subdissector_table;
 199 static heur_dissector_list_t heur_subdissector_list;
 200
 201 static dissector_handle_t ntlmssp_handle=NULL;
 202 static dissector_handle_t gssapi_handle=NULL;
 203
 204 static const value_string vals_status_code[] = {
 205         { 100, "Continue" },
 206         { 101, "Switching Protocols" },
 207         { 102, "Processing" },
 208         { 199, "Informational - Others" },
 209
 210         { 200, "OK"},
 211         { 201, "Created"},
 212         { 202, "Accepted"},
 213         { 203, "Non-authoritative Information"},
 214         { 204, "No Content"},
 215         { 205, "Reset Content"},
 216         { 206, "Partial Content"},
 217         { 207, "Multi-Status"},
 218         { 299, "Success - Others"},
 219
 220         { 300, "Multiple Choices"},
 221         { 301, "Moved Permanently"},
 222         { 302, "Found"},
 223         { 303, "See Other"},
 224         { 304, "Not Modified"},
 225         { 305, "Use Proxy"},
 226         { 307, "Temporary Redirect"},
 227         { 399, "Redirection - Others"},
 228
 229         { 400, "Bad Request"},
 230         { 401, "Unauthorized"},
 231         { 402, "Payment Required"},
 232         { 403, "Forbidden"},
 233         { 404, "Not Found"},
 234         { 405, "Method Not Allowed"},
 235         { 406, "Not Acceptable"},
 236         { 407, "Proxy Authentication Required"},
 237         { 408, "Request Time-out"},
 238         { 409, "Conflict"},
 239         { 410, "Gone"},
 240         { 411, "Length Required"},
 241         { 412, "Precondition Failed"},
 242         { 413, "Request Entity Too Large"},
 243         { 414, "Request-URI Too Long"},
 244         { 415, "Unsupported Media Type"},
 245         { 416, "Requested Range Not Satisfiable"},
 246         { 417, "Expectation Failed"},
 247         { 422, "Unprocessable Entity"},
 248         { 423, "Locked"},
 249         { 424, "Failed Dependency"},
 250         { 499, "Client Error - Others"},
 251
 252         { 500, "Internal Server Error"},
 253         { 501, "Not Implemented"},
 254         { 502, "Bad Gateway"},
 255         { 503, "Service Unavailable"},
 256         { 504, "Gateway Time-out"},
 257         { 505, "HTTP Version not supported"},
 258         { 507, "Insufficient Storage"},
 259         { 599, "Server Error - Others"},
 260
 261         { 0,    NULL}
 262 };
 263
 264 static const gchar* st_str_reqs = "HTTP Requests by Server";
 265 static const gchar* st_str_reqs_by_srv_addr = "HTTP Requests by Server Address";
 266 static const gchar* st_str_reqs_by_http_host = "HTTP Requests by HTTP Host";
 267 static const gchar* st_str_resps_by_srv_addr = "HTTP Responses by Server Address";
 268
 269 static int st_node_reqs = -1;
 270 static int st_node_reqs_by_srv_addr = -1;
 271 static int st_node_reqs_by_http_host = -1;
 272 static int st_node_resps_by_srv_addr = -1;
 273
 274 /* HTTP/Load Distribution stats init function */
 275 static void http_reqs_stats_tree_init(stats_tree* st) {
 276         st_node_reqs = stats_tree_create_node(st, st_str_reqs, 0, TRUE);
 277         st_node_reqs_by_srv_addr = stats_tree_create_node(st, st_str_reqs_by_srv_addr, st_node_reqs, TRUE);
 278         st_node_reqs_by_http_host = stats_tree_create_node(st, st_str_reqs_by_http_host, st_node_reqs, TRUE);
 279         st_node_resps_by_srv_addr = stats_tree_create_node(st, st_str_resps_by_srv_addr, 0, TRUE);
 280 }
 281
 282 /* HTTP/Load Distribution stats packet function */
 283 static int http_reqs_stats_tree_packet(stats_tree* st, packet_info* pinfo, epan_dissect_t* edt _U_, const void* p) {
 284         const http_info_value_t* v = p;
 285         int reqs_by_this_host;
 286         int reqs_by_this_addr;
 287         int resps_by_this_addr;
 288         int i = v->response_code;
 289         static gchar ip_str[256];
 290
 291
 292         if (v->request_method) {
 293                 g_snprintf(ip_str,sizeof(ip_str),"%s",address_to_str(&pinfo->dst));
 294
 295                 tick_stat_node(st, st_str_reqs, 0, FALSE);
 296                 tick_stat_node(st, st_str_reqs_by_srv_addr, st_node_reqs, TRUE);
 297                 tick_stat_node(st, st_str_reqs_by_http_host, st_node_reqs, TRUE);
 298                 reqs_by_this_addr = tick_stat_node(st, ip_str, st_node_reqs_by_srv_addr, TRUE);
 299
 300                 if (v->http_host) {
 301                         reqs_by_this_host = tick_stat_node(st, v->http_host, st_node_reqs_by_http_host, TRUE);
 302                         tick_stat_node(st, ip_str, reqs_by_this_host, FALSE);
 303
 304                         tick_stat_node(st, v->http_host, reqs_by_this_addr, FALSE);
 305                 }
 306
 307                 return 1;
 308
 309         } else if (i != 0) {
 310                 g_snprintf(ip_str,sizeof(ip_str),"%s",address_to_str(&pinfo->src));
 311
 312                 tick_stat_node(st, st_str_resps_by_srv_addr, 0, FALSE);
 313                 resps_by_this_addr = tick_stat_node(st, ip_str, st_node_resps_by_srv_addr, TRUE);
 314
 315                 if ( (i>100)&&(i<400) ) {
 316                         tick_stat_node(st, "OK", resps_by_this_addr, FALSE);
 317                 } else {
 318                         tick_stat_node(st, "KO", resps_by_this_addr, FALSE);
 319                 }
 320
 321                 return 1;
 322         }
 323
 324         return 0;
 325 }
 326
 327
 328 static int st_node_requests_by_host = -1;
 329 static const guint8* st_str_requests_by_host = "HTTP Requests by HTTP Host";
 330
 331 /* HTTP/Requests stats init function */
 332 static void http_req_stats_tree_init(stats_tree* st) {
 333         st_node_requests_by_host = stats_tree_create_node(st, st_str_requests_by_host, 0, TRUE);
 334 }
 335
 336 /* HTTP/Requests stats packet function */
 337 static int http_req_stats_tree_packet(stats_tree* st, packet_info* pinfo _U_, epan_dissect_t* edt _U_, const void* p) {
 338         const http_info_value_t* v = p;
 339         int reqs_by_this_host;
 340
 341         if (v->request_method) {
 342                 tick_stat_node(st, st_str_requests_by_host, 0, FALSE);
 343
 344                 if (v->http_host) {
 345                         reqs_by_this_host = tick_stat_node(st, v->http_host, st_node_requests_by_host, TRUE);
 346
 347                         if (v->request_uri) {
 348                                 tick_stat_node(st, v->request_uri, reqs_by_this_host, TRUE);
 349                         }
 350                 }
 351
 352                 return 1;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static const guint8* st_str_packets = "Total HTTP Packets";
 359 static const guint8* st_str_requests = "HTTP Request Packets";
 360 static const guint8* st_str_responses = "HTTP Response Packets";
 361 static const guint8* st_str_resp_broken = "???: broken";
 362 static const guint8* st_str_resp_100 = "1xx: Informational";
 363 static const guint8* st_str_resp_200 = "2xx: Success";
 364 static const guint8* st_str_resp_300 = "3xx: Redirection";
 365 static const guint8* st_str_resp_400 = "4xx: Client Error";
 366 static const guint8* st_str_resp_500 = "5xx: Server Error";
 367 static const guint8* st_str_other = "Other HTTP Packets";
 368
 369 static int st_node_packets = -1;
 370 static int st_node_requests = -1;
 371 static int st_node_responses = -1;
 372 static int st_node_resp_broken = -1;
 373 static int st_node_resp_100 = -1;
 374 static int st_node_resp_200 = -1;
 375 static int st_node_resp_300 = -1;
 376 static int st_node_resp_400 = -1;
 377 static int st_node_resp_500 = -1;
 378 static int st_node_other = -1;
 379
 380
 381 /* HTTP/Packet Counter stats init function */
 382 static void http_stats_tree_init(stats_tree* st) {
 383         st_node_packets = stats_tree_create_node(st, st_str_packets, 0, TRUE);
 384         st_node_requests = stats_tree_create_pivot(st, st_str_requests, st_node_packets);
 385         st_node_responses = stats_tree_create_node(st, st_str_responses, st_node_packets, TRUE);
 386         st_node_resp_broken = stats_tree_create_node(st, st_str_resp_broken, st_node_responses, TRUE);
 387         st_node_resp_100    = stats_tree_create_node(st, st_str_resp_100,    st_node_responses, TRUE);
 388         st_node_resp_200    = stats_tree_create_node(st, st_str_resp_200,    st_node_responses, TRUE);
 389         st_node_resp_300    = stats_tree_create_node(st, st_str_resp_300,    st_node_responses, TRUE);
 390         st_node_resp_400    = stats_tree_create_node(st, st_str_resp_400,    st_node_responses, TRUE);
 391         st_node_resp_500    = stats_tree_create_node(st, st_str_resp_500,    st_node_responses, TRUE);
 392         st_node_other = stats_tree_create_node(st, st_str_other, st_node_packets,FALSE);
 393 }
 394
 395 /* HTTP/Packet Counter stats packet function */
 396 static int http_stats_tree_packet(stats_tree* st, packet_info* pinfo _U_, epan_dissect_t* edt _U_, const void* p) {
 397         const http_info_value_t* v = p;
 398         guint i = v->response_code;
 399         int resp_grp;
 400         const guint8* resp_str;
 401         static gchar str[64];
 402
 403         tick_stat_node(st, st_str_packets, 0, FALSE);
 404
 405         if (i) {
 406                 tick_stat_node(st, st_str_responses, st_node_packets, FALSE);
 407
 408                 if ( (i<100)||(i>=600) ) {
 409                         resp_grp = st_node_resp_broken;
 410                         resp_str = st_str_resp_broken;
 411                 } else if (i<200) {
 412                         resp_grp = st_node_resp_100;
 413                         resp_str = st_str_resp_100;
 414                 } else if (i<300) {
 415                         resp_grp = st_node_resp_200;
 416                         resp_str = st_str_resp_200;
 417                 } else if (i<400) {
 418                         resp_grp = st_node_resp_300;
 419                         resp_str = st_str_resp_300;
 420                 } else if (i<500) {
 421                         resp_grp = st_node_resp_400;
 422                         resp_str = st_str_resp_400;
 423                 } else {
 424                         resp_grp = st_node_resp_500;
 425                         resp_str = st_str_resp_500;
 426                 }
 427
 428                 tick_stat_node(st, resp_str, st_node_responses, FALSE);
 429
 430                 g_snprintf(str, sizeof(str),"%u %s",i,match_strval(i,vals_status_code));
 431                 tick_stat_node(st, str, resp_grp, FALSE);
 432         } else if (v->request_method) {
 433                 stats_tree_tick_pivot(st,st_node_requests,v->request_method);
 434         } else {
 435                 tick_stat_node(st, st_str_other, st_node_packets, FALSE);
 436         }
 437
 438         return 1;
 439 }
 440
 441 /* Return a tvb that contains the binary representation of a base64
 442    string */
 443
 444 static tvbuff_t *
 445 base64_to_tvb(const char *base64)
 446 {
 447         tvbuff_t *tvb;
 448         char *data = g_strdup(base64);
 449         size_t len;
 450
 451         len = epan_base64_decode(data);
 452         tvb = tvb_new_real_data((const guint8 *)data, len, len);
 453
 454         tvb_set_free_cb(tvb, g_free);
 455
 456         return tvb;
 457 }
 458
 459 static void
 460 dissect_http_ntlmssp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
 461     const char *line)
 462 {
 463         tvbuff_t *ntlmssp_tvb;
 464
 465         ntlmssp_tvb = base64_to_tvb(line);
 466         tvb_set_child_real_data_tvbuff(tvb, ntlmssp_tvb);
 467         add_new_data_source(pinfo, ntlmssp_tvb, "NTLMSSP / GSSAPI Data");
 468         if (tvb_strneql(ntlmssp_tvb, 0, "NTLMSSP", 7) == 0)
 469                 call_dissector(ntlmssp_handle, ntlmssp_tvb, pinfo, tree);
 470         else
 471                 call_dissector(gssapi_handle, ntlmssp_tvb, pinfo, tree);
 472 }
 473
 474 /*
 475  * TODO: remove this ugly global variable.
 476  * XXX: do we really want to have to pass this from one function to another?
 477  */
 478 static http_info_value_t        *stat_info;
 479
 480 static int
 481 dissect_http_message(tvbuff_t *tvb, int offset, packet_info *pinfo,
 482     proto_tree *tree)
 483 {
 484         http_proto_t    proto;
 485         const char      *proto_tag;
 486         proto_tree      *http_tree = NULL;
 487         proto_item      *ti = NULL;
 488         const guchar    *line;
 489         gint            next_offset;
 490         const guchar    *linep, *lineend;
 491         int             orig_offset;
 492         int             first_linelen, linelen;
 493         gboolean        is_request_or_reply;
 494         gboolean        saw_req_resp_or_header;
 495         guchar          c;
 496         http_type_t     http_type;
 497         proto_item      *hdr_item = NULL;
 498         ReqRespDissector reqresp_dissector;
 499         proto_tree      *req_tree;
 500         int             colon_offset;
 501         headers_t       headers;
 502         int             datalen;
 503         int             reported_datalen = -1;
 504         dissector_handle_t handle;
 505         gboolean        dissected;
 506         /*guint         i;*/
 507         /*http_info_value_t *si;*/
 508         conversation_t  *conversation;
 509
 510         /*
 511          * Is this a request or response?
 512          *
 513          * Note that "tvb_find_line_end()" will return a value that
 514          * is not longer than what's in the buffer, so the
 515          * "tvb_get_ptr()" call won't throw an exception.
 516          */
 517         first_linelen = tvb_find_line_end(tvb, offset,
 518             tvb_ensure_length_remaining(tvb, offset), &next_offset,
 519             FALSE);
 520         /*
 521          * Is the first line a request or response?
 522          */
 523         line = tvb_get_ptr(tvb, offset, first_linelen);
 524         http_type = HTTP_OTHERS;        /* type not known yet */
 525         is_request_or_reply = is_http_request_or_reply((const gchar *)line,
 526             first_linelen, &http_type, NULL);
 527         if (is_request_or_reply) {
 528                 /*
 529                  * Yes, it's a request or response.
 530                  * Do header desegmentation if we've been told to,
 531                  * and do body desegmentation if we've been told to and
 532                  * we find a Content-Length header.
 533                  */
 534                 if (!req_resp_hdrs_do_reassembly(tvb, offset, pinfo,
 535                     http_desegment_headers, http_desegment_body)) {
 536                         /*
 537                          * More data needed for desegmentation.
 538                          */
 539                         return -1;
 540                 }
 541         }
 542
 543         conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
 544
 545         if(!conversation) {  /* Conversation does not exist yet - create it */
 546                 conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype, pinfo->srcport, pinfo->destport, 0);
 547         }
 548
 549         /* Retrieve information from conversation
 550          * or add it if it isn't there yet
 551          */
 552         stat_info = conversation_get_proto_data(conversation, proto_http);
 553         if(!stat_info) {
 554                 stat_info = se_alloc(sizeof(http_info_value_t));
 555                 stat_info->response_code = 0;
 556                 stat_info->request_method = NULL;
 557                 stat_info->request_uri = NULL;
 558                 stat_info->http_host = NULL;
 559
 560                 conversation_add_proto_data(conversation, proto_http, stat_info);
 561         }
 562
 563         switch (pinfo->match_port) {
 564
 565         case TCP_PORT_SSDP:     /* TCP_PORT_SSDP = UDP_PORT_SSDP */
 566                 proto = PROTO_SSDP;
 567                 proto_tag = "SSDP";
 568                 break;
 569
 570         case TCP_PORT_DAAP:
 571                 proto = PROTO_DAAP;
 572                 proto_tag = "DAAP";
 573                 break;
 574
 575         default:
 576                 proto = PROTO_HTTP;
 577                 proto_tag = "HTTP";
 578                 break;
 579         }
 580
 581         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 582                 col_set_str(pinfo->cinfo, COL_PROTOCOL, proto_tag);
 583         if (check_col(pinfo->cinfo, COL_INFO)) {
 584                 /*
 585                  * Put the first line from the buffer into the summary
 586                  * if it's an HTTP request or reply (but leave out the
 587                  * line terminator).
 588                  * Otherwise, just call it a continuation.
 589                  *
 590                  * Note that "tvb_find_line_end()" will return a value that
 591                  * is not longer than what's in the buffer, so the
 592                  * "tvb_get_ptr()" call won't throw an exception.
 593                  */
 594                 line = tvb_get_ptr(tvb, offset, first_linelen);
 595                 if (is_request_or_reply)
 596                         col_add_str(pinfo->cinfo, COL_INFO,
 597                             format_text(line, first_linelen));
 598                 else
 599                         col_set_str(pinfo->cinfo, COL_INFO, "Continuation or non-HTTP traffic");
 600         }
 601
 602         orig_offset = offset;
 603         if (tree) {
 604                 ti = proto_tree_add_item(tree, proto_http, tvb, offset, -1,
 605                     FALSE);
 606                 http_tree = proto_item_add_subtree(ti, ett_http);
 607         }
 608
 609         /*
 610          * Process the packet data, a line at a time.
 611          */
 612         http_type = HTTP_OTHERS;        /* type not known yet */
 613         headers.content_type = NULL;    /* content type not known yet */
 614         headers.content_type_parameters = NULL; /* content type parameters too */
 615         headers.have_content_length = FALSE;    /* content length not known yet */
 616         headers.content_encoding = NULL; /* content encoding not known yet */
 617         headers.transfer_encoding = NULL; /* transfer encoding not known yet */
 618         saw_req_resp_or_header = FALSE; /* haven't seen anything yet */
 619         while (tvb_reported_length_remaining(tvb, offset) != 0) {
 620                 /*
 621                  * Find the end of the line.
 622                  * XXX - what if we don't find it because the packet
 623                  * is cut short by a snapshot length or the header is
 624                  * split across TCP segments?  How much dissection should
 625                  * we do on it?
 626                  */
 627                 linelen = tvb_find_line_end(tvb, offset,
 628                     tvb_ensure_length_remaining(tvb, offset), &next_offset,
 629                     FALSE);
 630                 if (linelen < 0)
 631                         return -1;
 632
 633                 /*
 634                  * Get a buffer that refers to the line.
 635                  */
 636                 line = tvb_get_ptr(tvb, offset, linelen);
 637                 lineend = line + linelen;
 638                 colon_offset = -1;
 639
 640                 /*
 641                  * OK, does it look like an HTTP request or response?
 642                  */
 643                 reqresp_dissector = NULL;
 644                 is_request_or_reply =
 645                     is_http_request_or_reply((const gchar *)line,
 646                     linelen, &http_type, &reqresp_dissector);
 647                 if (is_request_or_reply)
 648                         goto is_http;
 649
 650                 /*
 651                  * No.  Does it look like a blank line (as would appear
 652                  * at the end of an HTTP request)?
 653                  */
 654                 if (linelen == 0)
 655                         goto is_http;   /* Yes. */
 656
 657                 /*
 658                  * No.  Does it look like a header?
 659                  */
 660                 linep = line;
 661                 colon_offset = offset;
 662                 while (linep < lineend) {
 663                         c = *linep++;
 664
 665                         /*
 666                          * This must be a CHAR to be part of a token; that
 667                          * means it must be ASCII.
 668                          */
 669                         if (!isascii(c))
 670                                 break;  /* not ASCII, thus not a CHAR */
 671
 672                         /*
 673                          * This mustn't be a CTL to be part of a token.
 674                          *
 675                          * XXX - what about leading LWS on continuation
 676                          * lines of a header?
 677                          */
 678                         if (iscntrl(c))
 679                                 break;  /* CTL, not part of a header */
 680
 681                         /*
 682                          * This mustn't be a SEP to be part of a token;
 683                          * a ':' ends the token, everything else is an
 684                          * indication that this isn't a header.
 685                          */
 686                         switch (c) {
 687
 688                         case '(':
 689                         case ')':
 690                         case '<':
 691                         case '>':
 692                         case '@':
 693                         case ',':
 694                         case ';':
 695                         case '\\':
 696                         case '"':
 697                         case '/':
 698                         case '[':
 699                         case ']':
 700                         case '?':
 701                         case '=':
 702                         case '{':
 703                         case '}':
 704                         case ' ':
 705                                 /*
 706                                  * It's a separator, so it's not part of a
 707                                  * token, so it's not a field name for the
 708                                  * beginning of a header.
 709                                  *
 710                                  * (We don't have to check for HT; that's
 711                                  * already been ruled out by "iscntrl()".)
 712                                  */
 713                                 goto not_http;
 714
 715                         case ':':
 716                                 /*
 717                                  * This ends the token; we consider this
 718                                  * to be a header.
 719                                  */
 720                                 goto is_http;
 721
 722                         default:
 723                                 colon_offset++;
 724                                 break;
 725                         }
 726                 }
 727
 728                 /*
 729                  * We haven't seen the colon, but everything else looks
 730                  * OK for a header line.
 731                  *
 732                  * If we've already seen an HTTP request or response
 733                  * line, or a header line, and we're at the end of
 734                  * the tvbuff, we assume this is an incomplete header
 735                  * line.  (We quit this loop after seeing a blank line,
 736                  * so if we've seen a request or response line, or a
 737                  * header line, this is probably more of the request
 738                  * or response we're presumably seeing.  There is some
 739                  * risk of false positives, but the same applies for
 740                  * full request or response lines or header lines,
 741                  * although that's less likely.)
 742                  *
 743                  * We throw an exception in that case, by checking for
 744                  * the existence of the next byte after the last one
 745                  * in the line.  If it exists, "tvb_ensure_bytes_exist()"
 746                  * throws no exception, and we fall through to the
 747                  * "not HTTP" case.  If it doesn't exist,
 748                  * "tvb_ensure_bytes_exist()" will throw the appropriate
 749                  * exception.
 750                  */
 751                 if (saw_req_resp_or_header)
 752                         tvb_ensure_bytes_exist(tvb, offset, linelen + 1);
 753
 754         not_http:
 755                 /*
 756                  * We don't consider this part of an HTTP request or
 757                  * reply, so we don't display it.
 758                  * (Yeah, that means we don't display, say, a text/http
 759                  * page, but you can get that from the data pane.)
 760                  */
 761                 break;
 762
 763         is_http:
 764                 /*
 765                  * Process this line.
 766                  */
 767                 if (linelen == 0) {
 768                         /*
 769                          * This is a blank line, which means that
 770                          * whatever follows it isn't part of this
 771                          * request or reply.
 772                          */
 773                         proto_tree_add_text(http_tree, tvb, offset,
 774                             next_offset - offset, "%s",
 775                             tvb_format_text(tvb, offset, next_offset - offset));
 776                         offset = next_offset;
 777                         break;
 778                 }
 779
 780                 /*
 781                  * Not a blank line - either a request, a reply, or a header
 782                  * line.
 783                  */
 784                 saw_req_resp_or_header = TRUE;
 785                 if (is_request_or_reply) {
 786                         if (tree) {
 787                                 hdr_item = proto_tree_add_text(http_tree, tvb,
 788                                     offset, next_offset - offset, "%s",
 789                                     tvb_format_text(tvb, offset,
 790                                       next_offset - offset));
 791                         }
 792                         expert_add_info_format(pinfo, hdr_item, PI_SEQUENCE, PI_CHAT,
 793                                 "%s",
 794                                 tvb_format_text(tvb, offset, next_offset - offset));
 795                         if (reqresp_dissector) {
 796                                 if (tree) req_tree = proto_item_add_subtree(hdr_item, ett_http_request);
 797                                 else req_tree = NULL;
 798
 799                                 reqresp_dissector(tvb, req_tree, offset, line, lineend);
 800                         }
 801                 } else {
 802                         /*
 803                          * Header.
 804                          */
 805                         process_header(tvb, offset, next_offset, line, linelen,
 806                             colon_offset, pinfo, http_tree, &headers);
 807                 }
 808                 offset = next_offset;
 809         }
 810
 811         if (tree) {
 812                 switch (http_type) {
 813
 814                 case HTTP_NOTIFICATION:
 815                         proto_tree_add_boolean_hidden(http_tree,
 816                             hf_http_notification, tvb, 0, 0, 1);
 817                         break;
 818
 819                 case HTTP_RESPONSE:
 820                         proto_tree_add_boolean_hidden(http_tree,
 821                             hf_http_response, tvb, 0, 0, 1);
 822                         break;
 823
 824                 case HTTP_REQUEST:
 825                         proto_tree_add_boolean_hidden(http_tree,
 826                             hf_http_request, tvb, 0, 0, 1);
 827                         break;
 828
 829                 case HTTP_OTHERS:
 830                 default:
 831                         break;
 832                 }
 833         }
 834
 835         /*
 836          * If a content length was supplied, the amount of data to be
 837          * processed as HTTP payload is the minimum of the content
 838          * length and the amount of data remaining in the frame.
 839          *
 840          * If no content length was supplied (or if a bad content length
 841          * was supplied), the amount of data to be processed is the amount
 842          * of data remaining in the frame.
 843          *
 844          * If there was no Content-Length entity header, we should
 845          * accumulate all data until the end of the connection.
 846          * That'd require that the TCP dissector call subdissectors
 847          * for all frames with FIN, even if they contain no data,
 848          * which would require subdissectors to deal intelligently
 849          * with empty segments.
 850          *
 851          * Acccording to RFC 2616, however, 1xx responses, 204 responses,
 852          * and 304 responses MUST NOT include a message body; if no
 853          * content length is specified for them, we don't attempt to
 854          * dissect the body.
 855          *
 856          * XXX - it says the same about responses to HEAD requests;
 857          * unless there's a way to determine from the response
 858          * whether it's a response to a HEAD request, we have to
 859          * keep information about the request and associate that with
 860          * the response in order to handle that.
 861          */
 862         datalen = tvb_length_remaining(tvb, offset);
 863         if (headers.have_content_length && headers.content_length != -1) {
 864                 if (datalen > headers.content_length)
 865                         datalen = headers.content_length;
 866
 867                 /*
 868                  * XXX - limit the reported length in the tvbuff we'll
 869                  * hand to a subdissector to be no greater than the
 870                  * content length.
 871                  *
 872                  * We really need both unreassembled and "how long it'd
 873                  * be if it were reassembled" lengths for tvbuffs, so
 874                  * that we throw the appropriate exceptions for
 875                  * "not enough data captured" (running past the length),
 876                  * "packet needed reassembly" (within the length but
 877                  * running past the unreassembled length), and
 878                  * "packet is malformed" (running past the reassembled
 879                  * length).
 880                  */
 881                 reported_datalen = tvb_reported_length_remaining(tvb, offset);
 882                 if (reported_datalen > headers.content_length)
 883                         reported_datalen = headers.content_length;
 884         } else {
 885                 switch (http_type) {
 886
 887                 case HTTP_REQUEST:
 888                         /*
 889                          * Requests have no content if there's no
 890                          * Content-Length header and no Transfer-Encoding
 891                          * header.
 892                          */
 893                         if (headers.transfer_encoding == NULL)
 894                                 datalen = 0;
 895                         else
 896                                 reported_datalen = -1;
 897                         break;
 898
 899                 case HTTP_RESPONSE:
 900                         if ((stat_info->response_code/100) == 1 ||
 901                             stat_info->response_code == 204 ||
 902                             stat_info->response_code == 304)
 903                                 datalen = 0;    /* no content! */
 904                         else {
 905                                 /*
 906                                  * XXX - responses to HEAD requests,
 907                                  * and possibly other responses,
 908                                  * "MUST NOT" include a
 909                                  * message-body.
 910                                  */
 911                                 reported_datalen = -1;
 912                         }
 913                         break;
 914
 915                 default:
 916                         /*
 917                          * XXX - what about HTTP_NOTIFICATION?
 918                          */
 919                         reported_datalen = -1;
 920                         break;
 921                 }
 922         }
 923
 924         if (datalen > 0) {
 925                 /*
 926                  * There's stuff left over; process it.
 927                  */
 928                 tvbuff_t *next_tvb;
 929                 void *save_private_data = NULL;
 930                 gint chunks_decoded = 0;
 931
 932                 /*
 933                  * Create a tvbuff for the payload.
 934                  *
 935                  * The amount of data to be processed that's
 936                  * available in the tvbuff is "datalen", which
 937                  * is the minimum of the amount of data left in
 938                  * the tvbuff and any specified content length.
 939                  *
 940                  * The amount of data to be processed that's in
 941                  * this frame, regardless of whether it was
 942                  * captured or not, is "reported_datalen",
 943                  * which, if no content length was specified,
 944                  * is -1, i.e. "to the end of the frame.
 945                  */
 946                 next_tvb = tvb_new_subset(tvb, offset, datalen,
 947                     reported_datalen);
 948                 /*
 949                  * BEWARE - next_tvb is a subset of another tvb,
 950                  * so we MUST NOT attempt tvb_free(next_tvb);
 951                  */
 952
 953                 /*
 954                  * Handle *transfer* encodings other than "identity".
 955                  */
 956                 if (headers.transfer_encoding != NULL &&
 957                     strcasecmp(headers.transfer_encoding, "identity") != 0) {
 958                         if (http_dechunk_body &&
 959                             (strncasecmp(headers.transfer_encoding, "chunked", 7)
 960                             == 0)) {
 961
 962                                 chunks_decoded = chunked_encoding_dissector(
 963                                     &next_tvb, pinfo, http_tree, 0);
 964
 965                                 if (chunks_decoded <= 0) {
 966                                         /*
 967                                          * The chunks weren't reassembled,
 968                                          * or there was a single zero
 969                                          * length chunk.
 970                                          */
 971                                         goto body_dissected;
 972                                 } else {
 973                                         /*
 974                                          * Add a new data source for the
 975                                          * de-chunked data.
 976                                          */
 977                                         tvb_set_child_real_data_tvbuff(tvb,
 978                                                 next_tvb);
 979                                         add_new_data_source(pinfo, next_tvb,
 980                                                 "De-chunked entity body");
 981                                 }
 982                         } else {
 983                                 /*
 984                                  * We currently can't handle, for example,
 985                                  * "gzip", "compress", or "deflate" as
 986                                  * *transfer* encodings; just handle them
 987                                  * as data for now.
 988                                  */
 989                                 call_dissector(data_handle, next_tvb, pinfo,
 990                                     http_tree);
 991                                 goto body_dissected;
 992                         }
 993                 }
 994                 /*
 995                  * At this point, any chunked *transfer* coding has been removed
 996                  * (the entity body has been dechunked) so it can be presented
 997                  * for the following operation (*content* encoding), or it has
 998                  * been been handed off to the data dissector.
 999                  *
1000                  * Handle *content* encodings other than "identity" (which
1001                  * shouldn't appear in a Content-Encoding header, but
1002                  * we handle it in any case).
1003                  */
1004                 if (headers.content_encoding != NULL &&
1005                     strcasecmp(headers.content_encoding, "identity") != 0) {
1006                         /*
1007                          * We currently can't handle, for example, "compress";
1008                          * just handle them as data for now.
1009                          *
1010                          * After July 7, 2004 the LZW patent expires, so support
1011                          * might be added then.  However, I don't think that
1012                          * anybody ever really implemented "compress", due to
1013                          * the aforementioned patent.
1014                          */
1015                         tvbuff_t *uncomp_tvb = NULL;
1016                         proto_item *e_ti = NULL;
1017                         proto_tree *e_tree = NULL;
1018
1019                         if (http_decompress_body &&
1020                             (strcasecmp(headers.content_encoding, "gzip") == 0 ||
1021                             strcasecmp(headers.content_encoding, "deflate")
1022                             == 0)) {
1023
1024                                 uncomp_tvb = tvb_uncompress(next_tvb, 0,
1025                                     tvb_length(next_tvb));
1026                         }
1027
1028                         /*
1029                          * Add the encoded entity to the protocol tree
1030                          */
1031                         e_ti = proto_tree_add_text(http_tree, next_tvb,
1032                                         0, tvb_length(next_tvb),
1033                                         "Content-encoded entity body (%s): %u bytes",
1034                                         headers.content_encoding,
1035                     tvb_length(next_tvb));
1036                         e_tree = proto_item_add_subtree(e_ti,
1037                                         ett_http_encoded_entity);
1038
1039                         if (uncomp_tvb != NULL) {
1040                                 /*
1041                                  * Decompression worked
1042                                  */
1043
1044                                 /* XXX - Don't free this, since it's possible
1045                                  * that the data was only partially
1046                                  * decompressed, such as when desegmentation
1047                                  * isn't enabled.
1048                                  *
1049                                 tvb_free(next_tvb);
1050                                 */
1051                 proto_item_append_text(e_ti, " -> %u bytes", tvb_length(uncomp_tvb));
1052                                 next_tvb = uncomp_tvb;
1053                                 tvb_set_child_real_data_tvbuff(tvb, next_tvb);
1054                                 add_new_data_source(pinfo, next_tvb,
1055                                     "Uncompressed entity body");
1056                         } else {
1057                                 if (chunks_decoded > 1) {
1058                                         tvb_set_child_real_data_tvbuff(tvb,
1059                                             next_tvb);
1060                                         add_new_data_source(pinfo, next_tvb,
1061                                             "Compressed entity body");
1062                                 }
1063                                 call_dissector(data_handle, next_tvb, pinfo,
1064                                     e_tree);
1065
1066                                 goto body_dissected;
1067                         }
1068                 }
1069                 /*
1070                  * Note that a new data source is added for the entity body
1071                  * only if it was content-encoded and/or transfer-encoded.
1072                  */
1073
1074                 /*
1075                  * Do subdissector checks.
1076                  *
1077                  * First, check whether some subdissector asked that they
1078                  * be called if something was on some particular port.
1079                  */
1080                 handle = dissector_get_port_handle(port_subdissector_table,
1081                     pinfo->match_port);
1082                 if (handle == NULL && headers.content_type != NULL) {
1083                         /*
1084                          * We didn't find any subdissector that
1085                          * registered for the port, and we have a
1086                          * Content-Type value.  Is there any subdissector
1087                          * for that content type?
1088                          */
1089                         save_private_data = pinfo->private_data;
1090
1091                         if (headers.content_type_parameters)
1092                                 pinfo->private_data = ep_strdup(headers.content_type_parameters);
1093                         else
1094                                 pinfo->private_data = NULL;
1095                         /*
1096                          * Calling the string handle for the media type
1097                          * dissector table will set pinfo->match_string
1098                          * to headers.content_type for us.
1099                          */
1100                         pinfo->match_string = headers.content_type;
1101                         handle = dissector_get_string_handle(
1102                             media_type_subdissector_table,
1103                             headers.content_type);
1104                 }
1105                 if (handle != NULL) {
1106                         /*
1107                          * We have a subdissector - call it.
1108                          */
1109                         dissected = call_dissector(handle, next_tvb, pinfo,
1110                             tree);
1111                 } else {
1112                         /*
1113                          * We don't have a subdissector - try the heuristic
1114                          * subdissectors.
1115                          */
1116                         dissected = dissector_try_heuristic(
1117                             heur_subdissector_list, next_tvb, pinfo, tree);
1118                 }
1119                 if (dissected) {
1120                         /*
1121                          * The subdissector dissected the body.
1122                          * Fix up the top-level item so that it doesn't
1123                          * include the stuff for that protocol.
1124                          */
1125                         if (ti != NULL)
1126                                 proto_item_set_len(ti, offset);
1127                 } else {
1128                         if (headers.content_type != NULL) {
1129                                 /*
1130                                  * Calling the default media handle if there is a content-type that
1131                                  * wasn't handled above.
1132                                  */
1133                                 call_dissector(media_handle, next_tvb, pinfo, tree);
1134                         } else {
1135                                 /* Call the subdissector (defaults to data), otherwise. */
1136                                 http_payload_subdissector(next_tvb, tree, http_tree, pinfo);
1137                         }
1138                 }
1139
1140         body_dissected:
1141                 /*
1142                  * Do *not* attempt at freeing the private data;
1143                  * it may be in use by subdissectors.
1144                  */
1145                 if (save_private_data)
1146                         pinfo->private_data = save_private_data;
1147                 /*
1148                  * We've processed "datalen" bytes worth of data
1149                  * (which may be no data at all); advance the
1150                  * offset past whatever data we've processed.
1151                  */
1152                 offset += datalen;
1153         }
1154
1155         tap_queue_packet(http_tap, pinfo, stat_info);
1156
1157         return offset - orig_offset;
1158 }
1159
1160 /* This can be used to dissect an HTTP request until such time
1161  * that a more complete dissector is written for that HTTP request.
1162  * This simple dissector only puts the request method, URI, and
1163  * protocol version into a sub-tree.
1164  */
1165 static void
1166 basic_request_dissector(tvbuff_t *tvb, proto_tree *tree, int offset,
1167     const guchar *line, const guchar *lineend)
1168 {
1169         const guchar *next_token;
1170         int tokenlen;
1171
1172         /* The first token is the method. */
1173         tokenlen = get_token_len(line, lineend, &next_token);
1174         if (tokenlen == 0)
1175                 return;
1176         proto_tree_add_item(tree, hf_http_request_method, tvb, offset, tokenlen,
1177             FALSE);
1178         offset += next_token - line;
1179         line = next_token;
1180
1181         /* The next token is the URI. */
1182         tokenlen = get_token_len(line, lineend, &next_token);
1183         if (tokenlen == 0)
1184                 return;
1185         stat_info->request_uri = se_strdup((gchar*) tvb_get_ephemeral_string(tvb, offset, tokenlen));
1186         proto_tree_add_string(tree, hf_http_request_uri, tvb, offset, tokenlen,
1187             stat_info->request_uri);
1188         offset += next_token - line;
1189         line = next_token;
1190
1191         /* Everything to the end of the line is the version. */
1192         tokenlen = lineend - line;
1193         if (tokenlen == 0)
1194                 return;
1195         proto_tree_add_item(tree, hf_http_version, tvb, offset, tokenlen,
1196             FALSE);
1197 }
1198
1199 static void
1200 basic_response_dissector(tvbuff_t *tvb, proto_tree *tree, int offset,
1201     const guchar *line, const guchar *lineend)
1202 {
1203         const guchar *next_token;
1204         int tokenlen;
1205         gchar response_chars[4];
1206
1207         /* The first token is the version. */
1208         tokenlen = get_token_len(line, lineend, &next_token);
1209         if (tokenlen == 0)
1210                 return;
1211         proto_tree_add_item(tree, hf_http_version, tvb, offset, tokenlen,
1212             FALSE);
1213         offset += next_token - line;
1214         line = next_token;
1215
1216         /* The next token is the status code. */
1217         tokenlen = get_token_len(line, lineend, &next_token);
1218         if (tokenlen < 3)
1219                 return;
1220         memcpy(response_chars, line, 3);
1221         response_chars[3] = '\0';
1222
1223         stat_info->response_code = strtoul(response_chars,NULL,10);
1224
1225         proto_tree_add_uint(tree, hf_http_response_code, tvb, offset, 3,
1226             stat_info->response_code);
1227 }
1228
1229 /*
1230  * Dissect the http data chunks and add them to the tree.
1231  */
1232 static int
1233 chunked_encoding_dissector(tvbuff_t **tvb_ptr, packet_info *pinfo,
1234     proto_tree *tree, int offset)
1235 {
1236         guint8 *chunk_string = NULL;
1237         guint32 chunk_size = 0;
1238         gint chunk_offset = 0;
1239         guint32 datalen = 0;
1240         gint linelen = 0;
1241         gint chunks_decoded = 0;
1242         tvbuff_t *tvb = NULL;
1243         tvbuff_t *new_tvb = NULL;
1244         gint chunked_data_size = 0;
1245         proto_tree *subtree = NULL;
1246         proto_item *ti = NULL;
1247
1248         if (tvb_ptr == NULL || *tvb_ptr == NULL) {
1249                 return 0;
1250         }
1251
1252         tvb = *tvb_ptr;
1253
1254         datalen = tvb_reported_length_remaining(tvb, offset);
1255
1256         if (tree) {
1257                 ti = proto_tree_add_text(tree, tvb, offset, datalen,
1258                     "HTTP chunked response");
1259                 subtree = proto_item_add_subtree(ti, ett_http_chunked_response);
1260         }
1261
1262
1263         while (datalen != 0) {
1264                 proto_item *chunk_ti = NULL;
1265                 proto_tree *chunk_subtree = NULL;
1266                 tvbuff_t *data_tvb = NULL;
1267                 gchar *c = NULL;
1268                 guint8 *raw_data;
1269                 gint raw_len = 0;
1270
1271                 linelen = tvb_find_line_end(tvb, offset, -1, &chunk_offset, TRUE);
1272
1273                 if (linelen <= 0) {
1274                         /* Can't get the chunk size line */
1275                         break;
1276                 }
1277
1278                 chunk_string = tvb_get_ephemeral_string(tvb, offset, linelen);
1279
1280                 if (chunk_string == NULL) {
1281                         /* Can't get the chunk size line */
1282                         break;
1283                 }
1284
1285                 c = (gchar*) chunk_string;
1286
1287                 /*
1288                  * We don't care about the extensions.
1289                  */
1290                 if ((c = strchr(c, ';'))) {
1291                         *c = '\0';
1292                 }
1293
1294                 chunk_size = strtol((gchar*)chunk_string, NULL, 16);
1295
1296                 if (chunk_size > datalen) {
1297                         /*
1298                          * The chunk size is more than what's in the tvbuff,
1299                          * so either the user hasn't enabled decoding, or all
1300                          * of the segments weren't captured.
1301                          */
1302                         chunk_size = datalen;
1303                 }
1304 #if 0
1305                   else if (new_tvb == NULL) {
1306                         new_tvb = tvb_new_composite();
1307                 }
1308
1309
1310
1311                 if (new_tvb != NULL && chunk_size != 0) {
1312                         tvbuff_t *chunk_tvb = NULL;
1313
1314                         chunk_tvb = tvb_new_subset(tvb, chunk_offset,
1315                             chunk_size, datalen);
1316
1317                         tvb_composite_append(new_tvb, chunk_tvb);
1318
1319                 }
1320 #endif
1321
1322                 chunked_data_size += chunk_size;
1323
1324                 raw_data = g_malloc(chunked_data_size);
1325                 raw_len = 0;
1326
1327                 if (new_tvb != NULL) {
1328                         raw_len = tvb_length_remaining(new_tvb, 0);
1329                         tvb_memcpy(new_tvb, raw_data, 0, raw_len);
1330
1331                         tvb_free(new_tvb);
1332                 }
1333
1334                 tvb_memcpy(tvb, (guint8 *)(raw_data + raw_len),
1335                             chunk_offset, chunk_size);
1336
1337                 new_tvb = tvb_new_real_data(raw_data,
1338                             chunked_data_size, chunked_data_size);
1339                 tvb_set_free_cb(new_tvb, g_free);
1340
1341
1342                 if (subtree) {
1343                         if(chunk_size == 0) {
1344                                 chunk_ti = proto_tree_add_text(subtree, tvb,
1345                                             offset,
1346                                             chunk_offset - offset + chunk_size + 2,
1347                                             "End of chunked encoding");
1348                         } else {
1349                                 chunk_ti = proto_tree_add_text(subtree, tvb,
1350                                             offset,
1351                                             chunk_offset - offset + chunk_size + 2,
1352                                             "Data chunk (%u octets)", chunk_size);
1353                         }
1354
1355                         chunk_subtree = proto_item_add_subtree(chunk_ti,
1356                             ett_http_chunk_data);
1357
1358                         proto_tree_add_text(chunk_subtree, tvb, offset,
1359                             chunk_offset - offset, "Chunk size: %u octets",
1360                             chunk_size);
1361
1362                         data_tvb = tvb_new_subset(tvb, chunk_offset, chunk_size,
1363                             datalen);
1364
1365
1366                         /*
1367                          * XXX - just use "proto_tree_add_text()"?
1368                          * This means that, in TShark, you get
1369                          * the entire chunk dumped out in hex,
1370                          * in addition to whatever dissection is
1371                          * done on the reassembled data.
1372                          */
1373                         call_dissector(data_handle, data_tvb, pinfo,
1374                                     chunk_subtree);
1375
1376                         proto_tree_add_text(chunk_subtree, tvb, chunk_offset +
1377                             chunk_size, 2, "Chunk boundary");
1378                 }
1379
1380                 chunks_decoded++;
1381                 offset = chunk_offset + chunk_size + 2;
1382                 datalen = tvb_reported_length_remaining(tvb, offset);
1383         }
1384
1385         if (new_tvb != NULL) {
1386
1387                 /* Placeholder for the day that composite tvbuffer's will work.
1388                 tvb_composite_finalize(new_tvb);
1389                 / * tvb_set_reported_length(new_tvb, chunked_data_size); * /
1390                 */
1391
1392                 /*
1393                  * XXX - Don't free this, since the tvbuffer that was passed
1394                  * may be used if the data spans multiple frames and reassembly
1395                  * isn't enabled.
1396                  *
1397                 tvb_free(*tvb_ptr);
1398                  */
1399                 *tvb_ptr = new_tvb;
1400
1401         } else {
1402                 /*
1403                  * We didn't create a new tvb, so don't allow sub dissectors
1404                  * try to decode the non-existant entity body.
1405                  */
1406                 chunks_decoded = -1;
1407         }
1408
1409         return chunks_decoded;
1410
1411 }
1412
1413 static void
1414 http_payload_subdissector(tvbuff_t *next_tvb, proto_tree *tree, proto_tree *sub_tree, packet_info *pinfo)
1415 {
1416         /* tree = the main protocol tree that the subdissector would be listed in
1417          * sub_tree = the http protocol tree
1418          */
1419         guint32 *ptr;
1420         struct tcpinfo *tcpinfo = pinfo->private_data;
1421         struct tcp_analysis *tcpd=NULL;
1422         gchar **strings; /* An array for splitting the request URI into hostname and port */
1423
1424         /* Response code 200 means "OK" and strncmp() == 0 means the strings match exactly */
1425         if(stat_info->request_uri && stat_info->response_code == 200 &&
1426            stat_info->request_method && strncmp(stat_info->request_method, "CONNECT", 7) == 0) {
1427
1428                 /* Call a subdissector to handle HTTP CONNECT's traffic */
1429                 tcpd=get_tcp_conversation_data(pinfo);
1430
1431                 /* Grab the destination port number from the request URI to find the right subdissector */
1432                 strings = g_strsplit(stat_info->request_uri, ":", 2);
1433
1434                 if(strings[0] != NULL && strings[1] != NULL) { /* The string was successfuly split in two */
1435                         proto_tree_add_text(sub_tree, next_tvb, 0, 0, "Proxy connect hostname: %s", strings[0]);
1436                         proto_tree_add_text(sub_tree, next_tvb, 0, 0, "Proxy connect port: %s", strings[1]);
1437
1438                         /* Replaces the pinfo->destport or srcport with the port the http connect was done to by
1439                          * checking to see which is the http port. */
1440                         if (pinfo->destport == TCP_PORT_HTTP             || pinfo->destport == TCP_PORT_PROXY_HTTP ||
1441                             pinfo->destport == TCP_PORT_PROXY_ADMIN_HTTP || pinfo->destport == TCP_ALT_PORT_HTTP   ||
1442                             pinfo->destport == TCP_RADAN_HTTP            || pinfo->destport == TCP_PORT_HKP        ||
1443                             pinfo->destport == TCP_PORT_DAAP             || pinfo->destport == http_alternate_tcp_port)
1444                                 ptr = &pinfo->destport;
1445                         else
1446                                 ptr = &pinfo->srcport;
1447
1448                         *ptr = (int)strtol(strings[1], NULL, 10); /* Convert string to a base-10 integer */
1449
1450                         /* We're going to get stuck in a loop if we call let dissect_tcp_payload call
1451                            us, so call the data dissector instead for proxy connections to http ports. */
1452                         if(*ptr == TCP_PORT_HTTP             || *ptr == TCP_PORT_PROXY_HTTP ||
1453                            *ptr == TCP_PORT_PROXY_ADMIN_HTTP || *ptr == TCP_ALT_PORT_HTTP   ||
1454                            *ptr == TCP_RADAN_HTTP            || *ptr == TCP_PORT_HKP        ||
1455                            *ptr == TCP_PORT_DAAP             || *ptr == http_alternate_tcp_port) {
1456                                 call_dissector(data_handle, next_tvb, pinfo, tree);
1457                         } else {
1458                                 dissect_tcp_payload(next_tvb, pinfo, 0, tcpinfo->seq, /* 0 = offset */
1459                                                     tcpinfo->nxtseq, pinfo->srcport, pinfo->destport,
1460                                                     tree, tree, tcpd);
1461                         }
1462                 }
1463
1464                 g_strfreev(strings); /* Free the result of g_strsplit() above */
1465
1466         } else {
1467                 /* Call the default data dissector */
1468                    call_dissector(data_handle, next_tvb, pinfo, sub_tree);
1469         }
1470 }
1471
1472
1473
1474 /*
1475  * XXX - this won't handle HTTP 0.9 replies, but they're all data
1476  * anyway.
1477  */
1478 static int
1479 is_http_request_or_reply(const gchar *data, int linelen, http_type_t *type,
1480                 ReqRespDissector *reqresp_dissector)
1481 {
1482         int isHttpRequestOrReply = FALSE;
1483         int prefix_len = 0;
1484
1485         /*
1486          * From RFC 2774 - An HTTP Extension Framework
1487          *
1488          * Support the command prefix that identifies the presence of
1489          * a "mandatory" header.
1490          */
1491         if (linelen >= 2 && strncmp(data, "M-", 2) == 0) {
1492                 data += 2;
1493                 linelen -= 2;
1494                 prefix_len = 2;
1495         }
1496
1497         /*
1498          * From draft-cohen-gena-client-01.txt, available from the uPnP forum:
1499          *      NOTIFY, SUBSCRIBE, UNSUBSCRIBE
1500          *
1501          * From draft-ietf-dasl-protocol-00.txt, a now vanished Microsoft draft:
1502          *      SEARCH
1503          */
1504         if (linelen >= 5 && strncmp(data, "HTTP/", 5) == 0) {
1505                 *type = HTTP_RESPONSE;
1506                 isHttpRequestOrReply = TRUE;    /* response */
1507                 if (reqresp_dissector)
1508                         *reqresp_dissector = basic_response_dissector;
1509         } else {
1510                 const guchar * ptr = (const guchar *)data;
1511                 int              index = 0;
1512
1513                 /* Look for the space following the Method */
1514                 while (index < linelen) {
1515                         if (*ptr == ' ')
1516                                 break;
1517                         else {
1518                                 ptr++;
1519                                 index++;
1520                         }
1521                 }
1522
1523                 /* Check the methods that have same length */
1524                 switch (index) {
1525
1526                 case 3:
1527                         if (strncmp(data, "GET", index) == 0 ||
1528                             strncmp(data, "PUT", index) == 0) {
1529                                 *type = HTTP_REQUEST;
1530                                 isHttpRequestOrReply = TRUE;
1531                         }
1532                         else if (strncmp(data, "ICY", index) == 0) {
1533                                 *type = HTTP_RESPONSE;
1534                                 isHttpRequestOrReply = TRUE;
1535                         }
1536                         break;
1537
1538                 case 4:
1539                         if (strncmp(data, "COPY", index) == 0 ||
1540                             strncmp(data, "HEAD", index) == 0 ||
1541                             strncmp(data, "LOCK", index) == 0 ||
1542                             strncmp(data, "MOVE", index) == 0 ||
1543                             strncmp(data, "POLL", index) == 0 ||
1544                             strncmp(data, "POST", index) == 0) {
1545                                 *type = HTTP_REQUEST;
1546                                 isHttpRequestOrReply = TRUE;
1547                         }
1548                         break;
1549
1550                 case 5:
1551                         if (strncmp(data, "BCOPY", index) == 0 ||
1552                                 strncmp(data, "BMOVE", index) == 0 ||
1553                                 strncmp(data, "MKCOL", index) == 0 ||
1554                                 strncmp(data, "TRACE", index) == 0 ||
1555                                 strncmp(data, "LABEL", index) == 0 ||  /* RFC 3253 8.2 */
1556                                 strncmp(data, "MERGE", index) == 0) {  /* RFC 3253 11.2 */
1557                                 *type = HTTP_REQUEST;
1558                                 isHttpRequestOrReply = TRUE;
1559                         }
1560                         break;
1561
1562                 case 6:
1563                         if (strncmp(data, "DELETE", index) == 0 ||
1564                                 strncmp(data, "SEARCH", index) == 0 ||
1565                                 strncmp(data, "UNLOCK", index) == 0 ||
1566                                 strncmp(data, "REPORT", index) == 0 ||  /* RFC 3253 3.6 */
1567                                 strncmp(data, "UPDATE", index) == 0) {  /* RFC 3253 7.1 */
1568                                 *type = HTTP_REQUEST;
1569                                 isHttpRequestOrReply = TRUE;
1570                         }
1571                         else if (strncmp(data, "NOTIFY", index) == 0) {
1572                                 *type = HTTP_NOTIFICATION;
1573                                 isHttpRequestOrReply = TRUE;
1574                         }
1575                         break;
1576
1577                 case 7:
1578                         if (strncmp(data, "BDELETE", index) == 0 ||
1579                             strncmp(data, "CONNECT", index) == 0 ||
1580                             strncmp(data, "OPTIONS", index) == 0 ||
1581                             strncmp(data, "CHECKIN", index) == 0) {  /* RFC 3253 4.4, 9.4 */
1582                                 *type = HTTP_REQUEST;
1583                                 isHttpRequestOrReply = TRUE;
1584                         }
1585                         break;
1586
1587                 case 8:
1588                         if (strncmp(data, "PROPFIND", index) == 0 ||
1589                             strncmp(data, "CHECKOUT", index) == 0 || /* RFC 3253 4.3, 9.3 */
1590                             strncmp(data, "CCM_POST", index) == 0) {
1591                                 *type = HTTP_REQUEST;
1592                                 isHttpRequestOrReply = TRUE;
1593                         }
1594                         break;
1595
1596                 case 9:
1597                         if (strncmp(data, "SUBSCRIBE", index) == 0) {
1598                                 *type = HTTP_NOTIFICATION;
1599                                 isHttpRequestOrReply = TRUE;
1600                         } else if (strncmp(data, "PROPPATCH", index) == 0 ||
1601                             strncmp(data, "BPROPFIND", index) == 0) {
1602                                 *type = HTTP_REQUEST;
1603                                 isHttpRequestOrReply = TRUE;
1604                         }
1605                         break;
1606
1607                 case 10:
1608                         if (strncmp(data, "BPROPPATCH", index) == 0 ||
1609                                 strncmp(data, "UNCHECKOUT", index) == 0 ||  /* RFC 3253 4.5 */
1610                                 strncmp(data, "MKACTIVITY", index) == 0) {  /* RFC 3253 13.5 */
1611                                 *type = HTTP_REQUEST;
1612                                 isHttpRequestOrReply = TRUE;
1613                         }
1614                         break;
1615
1616                 case 11:
1617                         if (strncmp(data, "MKWORKSPACE", index) == 0) {  /* RFC 3253 6.3 */
1618                                 *type = HTTP_REQUEST;
1619                                 isHttpRequestOrReply = TRUE;
1620                         } else if (strncmp(data, "UNSUBSCRIBE", index) == 0) {
1621                                 *type = HTTP_NOTIFICATION;
1622                                 isHttpRequestOrReply = TRUE;
1623                         } else if (strncmp(data, "RPC_CONNECT", index) == 0) {
1624                                 *type = HTTP_REQUEST;
1625                                 isHttpRequestOrReply = TRUE;
1626                         }
1627                         break;
1628
1629                 case 15:
1630                         if (strncmp(data, "VERSION-CONTROL", index) == 0) {  /* RFC 3253 3.5 */
1631                                 *type = HTTP_REQUEST;
1632                                 isHttpRequestOrReply = TRUE;
1633                         }
1634                         break;
1635
1636                 case 16:
1637                         if (strncmp(data, "BASELINE-CONTROL", index) == 0) {  /* RFC 3253 12.6 */
1638                                 *type = HTTP_REQUEST;
1639                                 isHttpRequestOrReply = TRUE;
1640                         }
1641                         break;
1642
1643                 default:
1644                         break;
1645                 }
1646
1647                 if (isHttpRequestOrReply && reqresp_dissector) {
1648                         *reqresp_dissector = basic_request_dissector;
1649                         if (!stat_info->request_method)
1650                                 stat_info->request_method = se_strndup(data, index+1);
1651                 }
1652         }
1653
1654         return isHttpRequestOrReply;
1655 }
1656
1657 /*
1658  * Process headers.
1659  */
1660 typedef struct {
1661         const char      *name;
1662         gint            *hf;
1663         int             special;
1664 } header_info;
1665
1666 #define HDR_NO_SPECIAL          0
1667 #define HDR_AUTHORIZATION       1
1668 #define HDR_AUTHENTICATE        2
1669 #define HDR_CONTENT_TYPE        3
1670 #define HDR_CONTENT_LENGTH      4
1671 #define HDR_CONTENT_ENCODING    5
1672 #define HDR_TRANSFER_ENCODING   6
1673 #define HDR_HOST  7
1674
1675 static const header_info headers[] = {
1676         { "Authorization", &hf_http_authorization, HDR_AUTHORIZATION },
1677         { "Proxy-Authorization", &hf_http_proxy_authorization, HDR_AUTHORIZATION },
1678         { "Proxy-Authenticate", &hf_http_proxy_authenticate, HDR_AUTHENTICATE },
1679         { "WWW-Authenticate", &hf_http_www_authenticate, HDR_AUTHENTICATE },
1680         { "Content-Type", &hf_http_content_type, HDR_CONTENT_TYPE },
1681         { "Content-Length", &hf_http_content_length, HDR_CONTENT_LENGTH },
1682         { "Content-Encoding", &hf_http_content_encoding, HDR_CONTENT_ENCODING },
1683         { "Transfer-Encoding", &hf_http_transfer_encoding, HDR_TRANSFER_ENCODING },
1684         { "User-Agent", &hf_http_user_agent, HDR_NO_SPECIAL },
1685         { "Host", &hf_http_host, HDR_HOST },
1686         { "Connection", &hf_http_connection, HDR_NO_SPECIAL },
1687         { "Cookie", &hf_http_cookie, HDR_NO_SPECIAL },
1688         { "Accept", &hf_http_accept, HDR_NO_SPECIAL },
1689         { "Referer", &hf_http_referer, HDR_NO_SPECIAL },
1690         { "Accept-Language", &hf_http_accept_language, HDR_NO_SPECIAL },
1691         { "Accept-Encoding", &hf_http_accept_encoding, HDR_NO_SPECIAL },
1692         { "Date", &hf_http_date, HDR_NO_SPECIAL },
1693         { "Cache-Control", &hf_http_cache_control, HDR_NO_SPECIAL },
1694         { "Server", &hf_http_server, HDR_NO_SPECIAL },
1695         { "Location", &hf_http_location, HDR_NO_SPECIAL },
1696         { "Set-Cookie", &hf_http_set_cookie, HDR_NO_SPECIAL },
1697         { "Last-Modified", &hf_http_last_modified, HDR_NO_SPECIAL },
1698         { "X-Forwarded-For", &hf_http_x_forwarded_for, HDR_NO_SPECIAL },
1699 };
1700
1701 static void
1702 process_header(tvbuff_t *tvb, int offset, int next_offset,
1703     const guchar *line, int linelen, int colon_offset,
1704     packet_info *pinfo, proto_tree *tree, headers_t *eh_ptr)
1705 {
1706         int len;
1707         int line_end_offset;
1708         int header_len;
1709         gint hf_index;
1710         guchar c;
1711         int value_offset;
1712         int value_len;
1713         char *value;
1714         char *p;
1715         guchar *up;
1716         proto_item *hdr_item;
1717         int i;
1718
1719         len = next_offset - offset;
1720         line_end_offset = offset + linelen;
1721         header_len = colon_offset - offset;
1722         hf_index = find_header_hf_value(tvb, offset, header_len);
1723
1724         if (hf_index == -1) {
1725                 /*
1726                  * Not a header we know anything about.  Just put it into
1727                  * the tree as text.
1728                  */
1729                 if (tree) {
1730                         proto_tree_add_text(tree, tvb, offset, len,
1731                             "%s", format_text(line, len));
1732                 }
1733         } else {
1734                 /*
1735                  * Skip whitespace after the colon.
1736                  */
1737                 value_offset = colon_offset + 1;
1738                 while (value_offset < line_end_offset
1739                     && ((c = line[value_offset - offset]) == ' ' || c == '\t'))
1740                         value_offset++;
1741
1742                 /*
1743                  * Fetch the value.
1744                  */
1745                 value_len = line_end_offset - value_offset;
1746                 value = ep_strndup(&line[value_offset - offset], value_len);
1747
1748                 /*
1749                  * Add it to the protocol tree as a particular field,
1750                  * but display the line as is.
1751                  */
1752                 if (tree) {
1753                         header_field_info *hfinfo;
1754                         guint32 tmp;
1755
1756                         hfinfo = proto_registrar_get_nth(*headers[hf_index].hf);
1757                         switch(hfinfo->type){
1758                         case FT_UINT8:
1759                         case FT_UINT16:
1760                         case FT_UINT24:
1761                         case FT_UINT32:
1762                         case FT_INT8:
1763                         case FT_INT16:
1764                         case FT_INT24:
1765                         case FT_INT32:
1766                                 tmp=strtol(value, NULL, 10);
1767                                 hdr_item = proto_tree_add_uint(tree, *headers[hf_index].hf, tvb, offset, len, tmp);
1768                                 break;
1769                         default:
1770                                 hdr_item = proto_tree_add_string_format(tree,
1771                                     *headers[hf_index].hf, tvb, offset, len,
1772                                     value, "%s", format_text(line, len));
1773                         }
1774                 } else
1775                         hdr_item = NULL;
1776
1777                 /*
1778                  * Do any special processing that particular headers
1779                  * require.
1780                  */
1781                 switch (headers[hf_index].special) {
1782
1783                 case HDR_AUTHORIZATION:
1784                         if (check_auth_ntlmssp(hdr_item, tvb, pinfo, value))
1785                                 break;  /* dissected NTLMSSP */
1786                         check_auth_basic(hdr_item, tvb, value);
1787                         break;
1788
1789                 case HDR_AUTHENTICATE:
1790                         check_auth_ntlmssp(hdr_item, tvb, pinfo, value);
1791                         break;
1792
1793                 case HDR_CONTENT_TYPE:
1794                         eh_ptr->content_type = (gchar*) ep_memdup((guint8*)value,value_len + 1);
1795
1796                         for (i = 0; i < value_len; i++) {
1797                                 c = value[i];
1798                                 if (c == ';' || isspace(c)) {
1799                                         /*
1800                                          * End of subtype - either
1801                                          * white space or a ";"
1802                                          * separating the subtype from
1803                                          * a parameter.
1804                                          */
1805                                         break;
1806                                 }
1807
1808                                 /*
1809                                  * Map the character to lower case;
1810                                  * content types are case-insensitive.
1811                                  */
1812                                 eh_ptr->content_type[i] = tolower(eh_ptr->content_type[i]);
1813                         }
1814                         eh_ptr->content_type[i] = '\0';
1815                         /*
1816                          * Now find the start of the optional parameters;
1817                          * skip the optional white space and the semicolon
1818                          * if this has not been done before.
1819                          */
1820                         i++;
1821                         while (i < value_len) {
1822                                 c = eh_ptr->content_type[i];
1823                                 if (c == ';' || isspace(c))
1824                                         /* Skip till start of parameters */
1825                                         i++;
1826                                 else
1827                                         break;
1828                         }
1829                         if (i < value_len)
1830                                 eh_ptr->content_type_parameters = eh_ptr->content_type + i;
1831                         else
1832                                 eh_ptr->content_type_parameters = NULL;
1833                         break;
1834
1835                 case HDR_CONTENT_LENGTH:
1836                         eh_ptr->content_length = strtol(value, &p, 10);
1837                         up = (guchar *)p;
1838                         if (eh_ptr->content_length < 0 || p == value ||
1839                             (*up != '\0' && !isspace(*up))) {
1840                                 /*
1841                                  * Content length not valid; pretend
1842                                  * we don't have it.
1843                                  */
1844                                 eh_ptr->have_content_length = FALSE;
1845                         } else {
1846                                 /*
1847                                  * We do have a valid content length.
1848                                  */
1849                                 eh_ptr->have_content_length = TRUE;
1850                         }
1851                         break;
1852
1853                 case HDR_CONTENT_ENCODING:
1854                         eh_ptr->content_encoding = ep_strndup(value, value_len);
1855                         break;
1856
1857                 case HDR_TRANSFER_ENCODING:
1858                         eh_ptr->transfer_encoding = ep_strndup(value, value_len);
1859                         break;
1860
1861                 case HDR_HOST:
1862                         stat_info->http_host = se_strndup(value, value_len);
1863                         break;
1864
1865                 }
1866         }
1867 }
1868
1869 /* Returns index of header tag in headers */
1870 static gint
1871 find_header_hf_value(tvbuff_t *tvb, int offset, guint header_len)
1872 {
1873         guint i;
1874
1875         for (i = 0; i < array_length(headers); i++) {
1876                 if (header_len == strlen(headers[i].name) &&
1877                     tvb_strncaseeql(tvb, offset,
1878                                                 headers[i].name, header_len) == 0)
1879                         return i;
1880         }
1881
1882         return -1;
1883 }
1884
1885 /*
1886  * Dissect Microsoft's abomination called NTLMSSP over HTTP.
1887  */
1888 static gboolean
1889 check_auth_ntlmssp(proto_item *hdr_item, tvbuff_t *tvb, packet_info *pinfo,
1890     gchar *value)
1891 {
1892         static const char *ntlm_headers[] = {
1893                 "NTLM ",
1894                 "Negotiate ",
1895                 NULL
1896         };
1897         const char **header;
1898         size_t hdrlen;
1899         proto_tree *hdr_tree;
1900
1901         /*
1902          * Check for NTLM credentials and challenge; those can
1903          * occur with WWW-Authenticate.
1904          */
1905         for (header = &ntlm_headers[0]; *header != NULL; header++) {
1906                 hdrlen = strlen(*header);
1907                 if (strncmp(value, *header, hdrlen) == 0) {
1908                         if (hdr_item != NULL) {
1909                                 hdr_tree = proto_item_add_subtree(hdr_item,
1910                                     ett_http_ntlmssp);
1911                         } else
1912                                 hdr_tree = NULL;
1913                         value += hdrlen;
1914                         dissect_http_ntlmssp(tvb, pinfo, hdr_tree, value);
1915                         return TRUE;
1916                 }
1917         }
1918         return FALSE;
1919 }
1920
1921 /*
1922  * Dissect HTTP Basic authorization.
1923  */
1924 static gboolean
1925 check_auth_basic(proto_item *hdr_item, tvbuff_t *tvb, gchar *value)
1926 {
1927         static const char *basic_headers[] = {
1928                 "Basic ",
1929                 NULL
1930         };
1931         const char **header;
1932         size_t hdrlen;
1933         proto_tree *hdr_tree;
1934         size_t len;
1935
1936         for (header = &basic_headers[0]; *header != NULL; header++) {
1937                 hdrlen = strlen(*header);
1938                 if (strncmp(value, *header, hdrlen) == 0) {
1939                         if (hdr_item != NULL) {
1940                                 hdr_tree = proto_item_add_subtree(hdr_item,
1941                                     ett_http_ntlmssp);
1942                         } else
1943                                 hdr_tree = NULL;
1944                         value += hdrlen;
1945
1946                         len = epan_base64_decode(value);
1947                         value[len] = '\0';
1948                         proto_tree_add_string(hdr_tree, hf_http_basic, tvb,
1949                             0, 0, value);
1950
1951                         return TRUE;
1952                 }
1953         }
1954         return FALSE;
1955 }
1956
1957 static void
1958 dissect_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1959 {
1960         int             offset = 0;
1961         int             len;
1962
1963         while (tvb_reported_length_remaining(tvb, offset) != 0) {
1964                 len = dissect_http_message(tvb, offset, pinfo, tree);
1965                 if (len == -1)
1966                         break;
1967                 offset += len;
1968
1969                 /*
1970                  * OK, we've set the Protocol and Info columns for the
1971                  * first HTTP message; make the columns non-writable,
1972                  * so that we don't change it for subsequent HTTP messages.
1973                  */
1974                 col_set_writable(pinfo->cinfo, FALSE);
1975         }
1976 }
1977
1978 static void
1979 dissect_http_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
1980 {
1981         dissect_http_message(tvb, 0, pinfo, tree);
1982 }
1983
1984 static void reinit_http(void) {
1985         if ( http_alternate_tcp_port != alternate_tcp_port ) {
1986
1987                 if (alternate_tcp_port)
1988                         dissector_delete("tcp.port", alternate_tcp_port, http_handle );
1989
1990                 if (http_alternate_tcp_port)
1991                         dissector_add("tcp.port", http_alternate_tcp_port, http_handle);
1992
1993                 alternate_tcp_port = http_alternate_tcp_port;
1994         }
1995 }
1996
1997 void
1998 proto_register_http(void)
1999 {
2000         static hf_register_info hf[] = {
2001             { &hf_http_notification,
2002               { "Notification",         "http.notification",
2003                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
2004                 "TRUE if HTTP notification", HFILL }},
2005             { &hf_http_response,
2006               { "Response",             "http.response",
2007                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
2008                 "TRUE if HTTP response", HFILL }},
2009             { &hf_http_request,
2010               { "Request",              "http.request",
2011                 FT_BOOLEAN, BASE_NONE, NULL, 0x0,
2012                 "TRUE if HTTP request", HFILL }},
2013             { &hf_http_basic,
2014               { "Credentials",          "http.authbasic",
2015                 FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }},
2016             { &hf_http_request_method,
2017               { "Request Method",       "http.request.method",
2018                 FT_STRING, BASE_NONE, NULL, 0x0,
2019                 "HTTP Request Method", HFILL }},
2020             { &hf_http_request_uri,
2021               { "Request URI",  "http.request.uri",
2022                 FT_STRING, BASE_NONE, NULL, 0x0,
2023                 "HTTP Request-URI", HFILL }},
2024             { &hf_http_version,
2025               { "Request Version",      "http.request.version",
2026                 FT_STRING, BASE_NONE, NULL, 0x0,
2027                 "HTTP Request HTTP-Version", HFILL }},
2028             { &hf_http_response_code,
2029               { "Response Code",        "http.response.code",
2030                 FT_UINT16, BASE_DEC, NULL, 0x0,
2031                 "HTTP Response Code", HFILL }},
2032             { &hf_http_authorization,
2033               { "Authorization",        "http.authorization",
2034                 FT_STRING, BASE_NONE, NULL, 0x0,
2035                 "HTTP Authorization header", HFILL }},
2036             { &hf_http_proxy_authenticate,
2037               { "Proxy-Authenticate",   "http.proxy_authenticate",
2038                 FT_STRING, BASE_NONE, NULL, 0x0,
2039                 "HTTP Proxy-Authenticate header", HFILL }},
2040             { &hf_http_proxy_authorization,
2041               { "Proxy-Authorization",  "http.proxy_authorization",
2042                 FT_STRING, BASE_NONE, NULL, 0x0,
2043                 "HTTP Proxy-Authorization header", HFILL }},
2044             { &hf_http_www_authenticate,
2045               { "WWW-Authenticate",     "http.www_authenticate",
2046                 FT_STRING, BASE_NONE, NULL, 0x0,
2047                 "HTTP WWW-Authenticate header", HFILL }},
2048             { &hf_http_content_type,
2049               { "Content-Type", "http.content_type",
2050                 FT_STRING, BASE_NONE, NULL, 0x0,
2051                 "HTTP Content-Type header", HFILL }},
2052             { &hf_http_content_length,
2053               { "Content-Length",       "http.content_length",
2054                 FT_UINT32, BASE_DEC, NULL, 0x0,
2055                 "HTTP Content-Length header", HFILL }},
2056             { &hf_http_content_encoding,
2057               { "Content-Encoding",     "http.content_encoding",
2058                 FT_STRING, BASE_NONE, NULL, 0x0,
2059                 "HTTP Content-Encoding header", HFILL }},
2060             { &hf_http_transfer_encoding,
2061               { "Transfer-Encoding",    "http.transfer_encoding",
2062                 FT_STRING, BASE_NONE, NULL, 0x0,
2063                 "HTTP Transfer-Encoding header", HFILL }},
2064             { &hf_http_user_agent,
2065               { "User-Agent",   "http.user_agent",
2066                 FT_STRING, BASE_NONE, NULL, 0x0,
2067                 "HTTP User-Agent header", HFILL }},
2068             { &hf_http_host,
2069               { "Host", "http.host",
2070                 FT_STRING, BASE_NONE, NULL, 0x0,
2071                 "HTTP Host", HFILL }},
2072             { &hf_http_connection,
2073               { "Connection",   "http.connection",
2074                 FT_STRING, BASE_NONE, NULL, 0x0,
2075                 "HTTP Connection", HFILL }},
2076             { &hf_http_cookie,
2077               { "Cookie",       "http.cookie",
2078                 FT_STRING, BASE_NONE, NULL, 0x0,
2079                 "HTTP Cookie", HFILL }},
2080             { &hf_http_accept,
2081               { "Accept",       "http.accept",
2082                 FT_STRING, BASE_NONE, NULL, 0x0,
2083                 "HTTP Accept", HFILL }},
2084             { &hf_http_referer,
2085               { "Referer",      "http.referer",
2086                 FT_STRING, BASE_NONE, NULL, 0x0,
2087                 "HTTP Referer", HFILL }},
2088             { &hf_http_accept_language,
2089               { "Accept-Language",      "http.accept_language",
2090                 FT_STRING, BASE_NONE, NULL, 0x0,
2091             "HTTP Accept Language", HFILL }},
2092             { &hf_http_accept_encoding,
2093               { "Accept Encoding",      "http.accept_encoding",
2094                 FT_STRING, BASE_NONE, NULL, 0x0,
2095                 "HTTP Accept Encoding", HFILL }},
2096             { &hf_http_date,
2097               { "Date", "http.date",
2098                 FT_STRING, BASE_NONE, NULL, 0x0,
2099                 "HTTP Date", HFILL }},
2100             { &hf_http_cache_control,
2101               { "Cache-Control",        "http.cache_control",
2102                 FT_STRING, BASE_NONE, NULL, 0x0,
2103                 "HTTP Cache Control", HFILL }},
2104             { &hf_http_server,
2105               { "Server",       "http.server",
2106                 FT_STRING, BASE_NONE, NULL, 0x0,
2107                 "HTTP Server", HFILL }},
2108             { &hf_http_location,
2109               { "Location",     "http.location",
2110                 FT_STRING, BASE_NONE, NULL, 0x0,
2111                 "HTTP Location", HFILL }},
2112             { &hf_http_set_cookie,
2113               { "Set-Cookie",   "http.set_cookie",
2114                 FT_STRING, BASE_NONE, NULL, 0x0,
2115                 "HTTP Set Cookie", HFILL }},
2116             { &hf_http_last_modified,
2117               { "Last-Modified",        "http.last_modified",
2118                 FT_STRING, BASE_NONE, NULL, 0x0,
2119                 "HTTP Last Modified", HFILL }},
2120             { &hf_http_x_forwarded_for,
2121               { "X-Forwarded-For",      "http.x_forwarded_for",
2122                 FT_STRING, BASE_NONE, NULL, 0x0,
2123                 "HTTP X-Forwarded-For", HFILL }},
2124         };
2125         static gint *ett[] = {
2126                 &ett_http,
2127                 &ett_http_ntlmssp,
2128                 &ett_http_request,
2129                 &ett_http_chunked_response,
2130                 &ett_http_chunk_data,
2131                 &ett_http_encoded_entity,
2132         };
2133         module_t *http_module;
2134
2135         proto_http = proto_register_protocol("Hypertext Transfer Protocol",
2136             "HTTP", "http");
2137         proto_register_field_array(proto_http, hf, array_length(hf));
2138         proto_register_subtree_array(ett, array_length(ett));
2139         register_dissector("http", dissect_http, proto_http);
2140         http_module = prefs_register_protocol(proto_http, reinit_http);
2141         prefs_register_bool_preference(http_module, "desegment_headers",
2142             "Reassemble HTTP headers spanning multiple TCP segments",
2143             "Whether the HTTP dissector should reassemble headers "
2144             "of a request spanning multiple TCP segments. "
2145                 "To use this option, you must also enable "
2146         "\"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
2147             &http_desegment_headers);
2148         prefs_register_bool_preference(http_module, "desegment_body",
2149             "Reassemble HTTP bodies spanning multiple TCP segments",
2150             "Whether the HTTP dissector should use the "
2151             "\"Content-length:\" value, if present, to reassemble "
2152             "the body of a request spanning multiple TCP segments, "
2153             "and reassemble chunked data spanning multiple TCP segments. "
2154                 "To use this option, you must also enable "
2155         "\"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
2156             &http_desegment_body);
2157         prefs_register_bool_preference(http_module, "dechunk_body",
2158             "Reassemble chunked transfer-coded bodies",
2159             "Whether to reassemble bodies of entities that are transfered "
2160             "using the \"Transfer-Encoding: chunked\" method",
2161             &http_dechunk_body);
2162 #ifdef HAVE_LIBZ
2163         prefs_register_bool_preference(http_module, "decompress_body",
2164             "Uncompress entity bodies",
2165             "Whether to uncompress entity bodies that are compressed "
2166             "using \"Content-Encoding: \"",
2167             &http_decompress_body);
2168 #endif
2169         prefs_register_uint_preference(http_module, "tcp_alternate_port",
2170                                                                    "Alternate TCP port",
2171                                                                    "Decode packets on this TCP port as HTTP",
2172                                                                    10,&http_alternate_tcp_port);
2173
2174         http_handle = create_dissector_handle(dissect_http, proto_http);
2175
2176         /*
2177          * Dissectors shouldn't register themselves in this table;
2178          * instead, they should call "http_dissector_add()", and
2179          * we'll register the port number they specify as a port
2180          * for HTTP, and register them in our subdissector table.
2181          *
2182          * This only works for protocols such as IPP that run over
2183          * HTTP on a specific non-HTTP port.
2184          */
2185         port_subdissector_table = register_dissector_table("http.port",
2186             "TCP port for protocols using HTTP", FT_UINT16, BASE_DEC);
2187
2188         /*
2189          * Dissectors can register themselves in this table.
2190          * It's just "media_type", not "http.content_type", because
2191          * it's an Internet media type, usable by other protocols as well.
2192          */
2193         media_type_subdissector_table =
2194             register_dissector_table("media_type",
2195                 "Internet media type", FT_STRING, BASE_NONE);
2196
2197         /*
2198          * Heuristic dissectors SHOULD register themselves in
2199          * this table using the standard heur_dissector_add()
2200          * function.
2201          */
2202         register_heur_dissector_list("http", &heur_subdissector_list);
2203
2204         /*
2205          * Register for tapping
2206          */
2207         http_tap = register_tap("http");
2208 }
2209
2210 /*
2211  * Called by dissectors for protocols that run atop HTTP/TCP.
2212  */
2213 void
2214 http_dissector_add(guint32 port, dissector_handle_t handle)
2215 {
2216         /*
2217          * Register ourselves as the handler for that port number
2218          * over TCP.
2219          */
2220         dissector_add("tcp.port", port, http_handle);
2221
2222         /*
2223          * And register them in *our* table for that port.
2224          */
2225         dissector_add("http.port", port, handle);
2226 }
2227
2228 void
2229 proto_reg_handoff_http(void)
2230 {
2231         dissector_handle_t http_udp_handle;
2232
2233         data_handle = find_dissector("data");
2234         media_handle = find_dissector("media");
2235
2236         dissector_add("tcp.port", TCP_PORT_HTTP, http_handle);
2237         dissector_add("tcp.port", TCP_PORT_PROXY_HTTP, http_handle);
2238         dissector_add("tcp.port", TCP_ALT_PORT_HTTP, http_handle);
2239         dissector_add("tcp.port", TCP_RADAN_HTTP, http_handle);
2240         dissector_add("tcp.port", TCP_PORT_PROXY_ADMIN_HTTP, http_handle);
2241         dissector_add("tcp.port", TCP_PORT_HKP, http_handle);
2242
2243         /*
2244          * XXX - is there anything to dissect in the body of an SSDP
2245          * request or reply?  I.e., should there be an SSDP dissector?
2246          */
2247         dissector_add("tcp.port", TCP_PORT_SSDP, http_handle);
2248         http_udp_handle = create_dissector_handle(dissect_http_udp, proto_http);
2249         dissector_add("udp.port", UDP_PORT_SSDP, http_udp_handle);
2250
2251         ntlmssp_handle = find_dissector("ntlmssp");
2252         gssapi_handle = find_dissector("gssapi");
2253
2254         stats_tree_register("http","http","HTTP/Packet Counter", http_stats_tree_packet, http_stats_tree_init, NULL );
2255         stats_tree_register("http","http_req","HTTP/Requests", http_req_stats_tree_packet, http_req_stats_tree_init, NULL );
2256         stats_tree_register("http","http_srv","HTTP/Load Distribution",http_reqs_stats_tree_packet,http_reqs_stats_tree_init, NULL );
2257
2258 }
2259
2260 /*
2261  * Content-Type: message/http
2262  */
2263
2264 static gint proto_message_http = -1;
2265 static gint ett_message_http = -1;
2266 static dissector_handle_t message_http_handle;
2267
2268 static void
2269 dissect_message_http(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
2270 {
2271         proto_tree      *subtree;
2272         proto_item      *ti;
2273         gint            offset = 0, next_offset;
2274         gint            len;
2275
2276         if (check_col(pinfo->cinfo, COL_INFO))
2277                 col_append_str(pinfo->cinfo, COL_INFO, " (message/http)");
2278         if (tree) {
2279                 ti = proto_tree_add_item(tree, proto_message_http,
2280                                 tvb, 0, -1, FALSE);
2281                 subtree = proto_item_add_subtree(ti, ett_message_http);
2282                 while (tvb_reported_length_remaining(tvb, offset) != 0) {
2283                         len = tvb_find_line_end(tvb, offset,
2284                                         tvb_ensure_length_remaining(tvb, offset),
2285                                         &next_offset, FALSE);
2286                         if (len == -1)
2287                                 break;
2288                         proto_tree_add_text(subtree, tvb, offset, next_offset - offset,
2289                                         "%s", tvb_format_text(tvb, offset, len));
2290                         offset = next_offset;
2291                 }
2292         }
2293 }
2294
2295 void
2296 proto_register_message_http(void)
2297 {
2298         static gint *ett[] = {
2299                 &ett_message_http,
2300         };
2301
2302         proto_message_http = proto_register_protocol(
2303                         "Media Type: message/http",
2304                         "message/http",
2305                         "message-http"
2306         );
2307         proto_register_subtree_array(ett, array_length(ett));
2308 }
2309
2310 void
2311 proto_reg_handoff_message_http(void)
2312 {
2313         message_http_handle = create_dissector_handle(dissect_message_http,
2314                         proto_message_http);
2315
2316         dissector_add_string("media_type", "message/http", message_http_handle);
2317 }