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