gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <sys/socket.h>
  33 #include <arpa/inet.h>
  34
  35 #include "giognutls.h"
  36 #include "gresolv.h"
  37 #include "gweb.h"
  38
  39 #define DEFAULT_BUFFER_SIZE  2048
  40
  41 #define SESSION_FLAG_USE_TLS    (1 << 0)
  42
  43 enum chunk_state {
  44         CHUNK_SIZE,
  45         CHUNK_R_BODY,
  46         CHUNK_N_BODY,
  47         CHUNK_DATA,
  48 };
  49
  50 struct _GWebResult {
  51         guint16 status;
  52         const guint8 *buffer;
  53         gsize length;
  54         gboolean use_chunk;
  55 };
  56
  57 struct web_session {
  58         GWeb *web;
  59
  60         char *address;
  61         char *host;
  62         uint16_t port;
  63         unsigned long flags;
  64
  65         char *content_type;
  66
  67         GIOChannel *transport_channel;
  68         guint transport_watch;
  69         guint send_watch;
  70
  71         guint resolv_action;
  72         char *request;
  73
  74         guint8 *receive_buffer;
  75         gsize receive_space;
  76         GString *send_buffer;
  77         GString *current_header;
  78         gboolean header_done;
  79         gboolean body_done;
  80         gboolean more_data;
  81         gboolean request_started;
  82
  83         enum chunk_state chunck_state;
  84         gsize chunk_size;
  85         gsize chunk_left;
  86         gsize total_len;
  87
  88         GWebResult result;
  89
  90         GWebResultFunc result_func;
  91         GWebInputFunc input_func;
  92         gpointer user_data;
  93 };
  94
  95 struct _GWeb {
  96         gint ref_count;
  97
  98         guint next_query_id;
  99
 100         int index;
 101         GList *session_list;
 102
 103         GResolv *resolv;
 104         char *proxy;
 105         char *accept_option;
 106         char *user_agent;
 107         char *http_version;
 108         gboolean close_connection;
 109
 110         GWebDebugFunc debug_func;
 111         gpointer debug_data;
 112 };
 113
 114 static inline void debug(GWeb *web, const char *format, ...)
 115 {
 116         char str[256];
 117         va_list ap;
 118
 119         if (web->debug_func == NULL)
 120                 return;
 121
 122         va_start(ap, format);
 123
 124         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 125                 web->debug_func(str, web->debug_data);
 126
 127         va_end(ap);
 128 }
 129
 130 static void free_session(struct web_session *session)
 131 {
 132         GWeb *web = session->web;
 133
 134         if (session == NULL)
 135                 return;
 136
 137         g_free(session->request);
 138
 139         if (session->resolv_action > 0)
 140                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 141
 142         if (session->transport_watch > 0)
 143                 g_source_remove(session->transport_watch);
 144
 145         if (session->send_watch > 0)
 146                 g_source_remove(session->send_watch);
 147
 148         if (session->transport_channel != NULL)
 149                 g_io_channel_unref(session->transport_channel);
 150
 151         g_string_free(session->send_buffer, TRUE);
 152         g_string_free(session->current_header, TRUE);
 153         g_free(session->receive_buffer);
 154
 155         g_free(session->content_type);
 156
 157         g_free(session->host);
 158         g_free(session->address);
 159         g_free(session);
 160 }
 161
 162 static void flush_sessions(GWeb *web)
 163 {
 164         GList *list;
 165
 166         for (list = g_list_first(web->session_list);
 167                                         list; list = g_list_next(list))
 168                 free_session(list->data);
 169
 170         g_list_free(web->session_list);
 171         web->session_list = NULL;
 172 }
 173
 174 GWeb *g_web_new(int index)
 175 {
 176         GWeb *web;
 177
 178         if (index < 0)
 179                 return NULL;
 180
 181         web = g_try_new0(GWeb, 1);
 182         if (web == NULL)
 183                 return NULL;
 184
 185         web->ref_count = 1;
 186
 187         web->next_query_id = 1;
 188
 189         web->index = index;
 190         web->session_list = NULL;
 191
 192         web->resolv = g_resolv_new(index);
 193         if (web->resolv == NULL) {
 194                 g_free(web);
 195                 return NULL;
 196         }
 197
 198         web->accept_option = g_strdup("*/*");
 199         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 200         web->close_connection = FALSE;
 201
 202         return web;
 203 }
 204
 205 GWeb *g_web_ref(GWeb *web)
 206 {
 207         if (web == NULL)
 208                 return NULL;
 209
 210         g_atomic_int_inc(&web->ref_count);
 211
 212         return web;
 213 }
 214
 215 void g_web_unref(GWeb *web)
 216 {
 217         if (web == NULL)
 218                 return;
 219
 220         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 221                 return;
 222
 223         flush_sessions(web);
 224
 225         g_resolv_unref(web->resolv);
 226
 227         g_free(web->proxy);
 228
 229         g_free(web->accept_option);
 230         g_free(web->user_agent);
 231         g_free(web->http_version);
 232
 233         g_free(web);
 234 }
 235
 236 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 237 {
 238         if (web == NULL)
 239                 return;
 240
 241         web->debug_func = func;
 242         web->debug_data = user_data;
 243
 244         g_resolv_set_debug(web->resolv, func, user_data);
 245 }
 246
 247 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 248 {
 249         if (web == NULL)
 250                 return FALSE;
 251
 252         g_free(web->proxy);
 253         web->proxy = g_strdup(proxy);
 254
 255         return TRUE;
 256 }
 257
 258 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 259 {
 260         if (web == NULL)
 261                 return FALSE;
 262
 263         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 264
 265         return TRUE;
 266 }
 267
 268 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 269 {
 270         g_free(web->accept_option);
 271
 272         if (format == NULL) {
 273                 web->accept_option = NULL;
 274                 debug(web, "clearing accept option");
 275         } else {
 276                 web->accept_option = g_strdup_vprintf(format, args);
 277                 debug(web, "setting accept %s", web->accept_option);
 278         }
 279
 280         return TRUE;
 281 }
 282
 283 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 284 {
 285         va_list args;
 286         gboolean result;
 287
 288         if (web == NULL)
 289                 return FALSE;
 290
 291         va_start(args, format);
 292         result = set_accept_option(web, format, args);
 293         va_end(args);
 294
 295         return result;
 296 }
 297
 298 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 299 {
 300         g_free(web->user_agent);
 301
 302         if (format == NULL) {
 303                 web->user_agent = NULL;
 304                 debug(web, "clearing user agent");
 305         } else {
 306                 web->user_agent = g_strdup_vprintf(format, args);
 307                 debug(web, "setting user agent %s", web->user_agent);
 308         }
 309
 310         return TRUE;
 311 }
 312
 313 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 314 {
 315         va_list args;
 316         gboolean result;
 317
 318         if (web == NULL)
 319                 return FALSE;
 320
 321         va_start(args, format);
 322         result = set_user_agent(web, format, args);
 323         va_end(args);
 324
 325         return result;
 326 }
 327
 328 gboolean g_web_set_http_version(GWeb *web, const char *version)
 329 {
 330         if (web == NULL)
 331                 return FALSE;
 332
 333         g_free(web->http_version);
 334
 335         if (version == NULL) {
 336                 web->http_version = NULL;
 337                 debug(web, "clearing HTTP version");
 338         } else {
 339                 web->http_version = g_strdup(version);
 340                 debug(web, "setting HTTP version %s", web->http_version);
 341         }
 342
 343         return TRUE;
 344 }
 345
 346 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 347 {
 348         if (web == NULL)
 349                 return;
 350
 351         web->close_connection = enabled;
 352 }
 353
 354 gboolean g_web_get_close_connection(GWeb *web)
 355 {
 356         if (web == NULL)
 357                 return FALSE;
 358
 359         return web->close_connection;
 360 }
 361
 362 static inline void call_result_func(struct web_session *session, guint16 status)
 363 {
 364         if (session->result_func == NULL)
 365                 return;
 366
 367         if (status != 0)
 368                 session->result.status = status;
 369
 370         session->result_func(&session->result, session->user_data);
 371 }
 372
 373 static gboolean process_send_buffer(struct web_session *session)
 374 {
 375         GString *buf = session->send_buffer;
 376         gsize count, bytes_written;
 377         GIOStatus status;
 378
 379         count = buf->len;
 380
 381         if (count == 0) {
 382                 if (session->more_data == FALSE)
 383                         session->body_done = TRUE;
 384
 385                 return FALSE;
 386         }
 387
 388         debug(session->web, "bytes to write %zu", count);
 389
 390         status = g_io_channel_write_chars(session->transport_channel,
 391                                         buf->str, count, &bytes_written, NULL);
 392
 393         debug(session->web, "status %u bytes written %zu",
 394                                         status, bytes_written);
 395
 396         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 397                 return FALSE;
 398
 399         g_string_erase(buf, 0, bytes_written);
 400
 401         return TRUE;
 402 }
 403
 404 static void process_next_chunk(struct web_session *session)
 405 {
 406         GString *buf = session->send_buffer;
 407         const guint8 *body;
 408         gsize length;
 409
 410         if (session->input_func == NULL) {
 411                 session->more_data = FALSE;
 412                 return;
 413         }
 414
 415         session->more_data = session->input_func(&body, &length,
 416                                                 session->user_data);
 417
 418         if (length > 0) {
 419                 g_string_append_printf(buf, "%zx\r\n", length);
 420                 g_string_append_len(buf, (char *) body, length);
 421                 g_string_append(buf, "\r\n");
 422         }
 423
 424         if (session->more_data == FALSE)
 425                 g_string_append(buf, "0\r\n\r\n");
 426 }
 427
 428 static void start_request(struct web_session *session)
 429 {
 430         GString *buf = session->send_buffer;
 431         const char *version;
 432         const guint8 *body;
 433         gsize length;
 434
 435         debug(session->web, "request %s from %s",
 436                                         session->request, session->host);
 437
 438         g_string_truncate(buf, 0);
 439
 440         if (session->web->http_version == NULL)
 441                 version = "1.1";
 442         else
 443                 version = session->web->http_version;
 444
 445         if (session->content_type == NULL)
 446                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 447                                                 session->request, version);
 448         else
 449                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 450                                                 session->request, version);
 451
 452         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 453
 454         if (session->web->user_agent != NULL)
 455                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 456                                                 session->web->user_agent);
 457
 458         if (session->web->accept_option != NULL)
 459                 g_string_append_printf(buf, "Accept: %s\r\n",
 460                                                 session->web->accept_option);
 461
 462         if (session->content_type != NULL) {
 463                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 464                                                         session->content_type);
 465                 if (session->input_func == NULL) {
 466                         session->more_data = FALSE;
 467                         length = 0;
 468                 } else
 469                         session->more_data = session->input_func(&body, &length,
 470                                                         session->user_data);
 471                 if (session->more_data == FALSE)
 472                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 473                                                                         length);
 474                 else
 475                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 476         }
 477
 478         if (session->web->close_connection == TRUE)
 479                 g_string_append(buf, "Connection: close\r\n");
 480
 481         g_string_append(buf, "\r\n");
 482
 483         if (session->content_type != NULL && length > 0) {
 484                 if (session->more_data == TRUE) {
 485                         g_string_append_printf(buf, "%zx\r\n", length);
 486                         g_string_append_len(buf, (char *) body, length);
 487                         g_string_append(buf, "\r\n");
 488                 } else
 489                         g_string_append_len(buf, (char *) body, length);
 490         }
 491 }
 492
 493 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 494                                                 gpointer user_data)
 495 {
 496         struct web_session *session = user_data;
 497
 498         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 499                 session->send_watch = 0;
 500                 return FALSE;
 501         }
 502
 503         if (process_send_buffer(session) == TRUE)
 504                 return TRUE;
 505
 506         if (session->request_started == FALSE) {
 507                 session->request_started = TRUE;
 508                 start_request(session);
 509         } else if (session->more_data == TRUE)
 510                 process_next_chunk(session);
 511
 512         process_send_buffer(session);
 513
 514         if (session->body_done == TRUE) {
 515                 session->send_watch = 0;
 516                 return FALSE;
 517         }
 518
 519         return TRUE;
 520 }
 521
 522 static int decode_chunked(struct web_session *session,
 523                                         const guint8 *buf, gsize len)
 524 {
 525         const guint8 *ptr = buf;
 526         gsize counter;
 527
 528         while (len > 0) {
 529                 guint8 *pos;
 530                 gsize count;
 531                 char *str;
 532
 533                 switch (session->chunck_state) {
 534                 case CHUNK_SIZE:
 535                         pos = memchr(ptr, '\n', len);
 536                         if (pos == NULL) {
 537                                 g_string_append_len(session->current_header,
 538                                                 (gchar *) ptr, len);
 539                                 return 0;
 540                         }
 541
 542                         count = pos - ptr;
 543                         if (count < 1 || ptr[count - 1] != '\r')
 544                                 return -EILSEQ;
 545
 546                         g_string_append_len(session->current_header,
 547                                                 (gchar *) ptr, count);
 548
 549                         len -= count + 1;
 550                         ptr = pos + 1;
 551
 552                         str = session->current_header->str;
 553
 554                         counter = strtoul(str, NULL, 16);
 555                         if ((counter == 0 && errno == EINVAL) ||
 556                                                 counter == ULONG_MAX)
 557                                 return -EILSEQ;
 558
 559                         session->chunk_size = counter;
 560                         session->chunk_left = counter;
 561
 562                         session->chunck_state = CHUNK_DATA;
 563                         break;
 564                 case CHUNK_R_BODY:
 565                         if (*ptr != '\r')
 566                                 return -EILSEQ;
 567                         ptr++;
 568                         len--;
 569                         session->chunck_state = CHUNK_N_BODY;
 570                         break;
 571                 case CHUNK_N_BODY:
 572                         if (*ptr != '\n')
 573                                 return -EILSEQ;
 574                         ptr++;
 575                         len--;
 576                         session->chunck_state = CHUNK_SIZE;
 577                         break;
 578                 case CHUNK_DATA:
 579                         if (session->chunk_size == 0) {
 580                                 debug(session->web, "Download Done in chunk");
 581                                 g_string_truncate(session->current_header, 0);
 582                                 return 0;
 583                         }
 584
 585                         if (session->chunk_left <= len) {
 586                                 session->result.buffer = ptr;
 587                                 session->result.length = session->chunk_left;
 588                                 call_result_func(session, 0);
 589
 590                                 len -= session->chunk_left;
 591                                 ptr += session->chunk_left;
 592
 593                                 session->total_len += session->chunk_left;
 594                                 session->chunk_left = 0;
 595
 596                                 g_string_truncate(session->current_header, 0);
 597                                 session->chunck_state = CHUNK_R_BODY;
 598                                 break;
 599                         }
 600                         /* more data */
 601                         session->result.buffer = ptr;
 602                         session->result.length = len;
 603                         call_result_func(session, 0);
 604
 605                         session->chunk_left -= len;
 606                         session->total_len += len;
 607
 608                         len -= len;
 609                         ptr += len;
 610                         break;
 611                 }
 612         }
 613
 614         return 0;
 615 }
 616
 617 static int handle_body(struct web_session *session,
 618                                 const guint8 *buf, gsize len)
 619 {
 620         int err;
 621
 622         debug(session->web, "[body] length %zu", len);
 623
 624         if (session->result.use_chunk == FALSE) {
 625                 session->result.buffer = buf;
 626                 session->result.length = len;
 627                 call_result_func(session, 0);
 628                 return 0;
 629         }
 630
 631         err = decode_chunked(session, buf, len);
 632         if (err < 0) {
 633                 debug(session->web, "Error in chunk decode %d", err);
 634
 635                 session->result.buffer = NULL;
 636                 session->result.length = 0;
 637                 call_result_func(session, 400);
 638         }
 639
 640         return err;
 641 }
 642
 643 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 644                                                         gpointer user_data)
 645 {
 646         struct web_session *session = user_data;
 647         guint8 *ptr = session->receive_buffer;
 648         gsize bytes_read;
 649         GIOStatus status;
 650
 651         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 652                 session->transport_watch = 0;
 653                 session->result.buffer = NULL;
 654                 session->result.length = 0;
 655                 call_result_func(session, 400);
 656                 return FALSE;
 657         }
 658
 659         status = g_io_channel_read_chars(channel,
 660                                 (gchar *) session->receive_buffer,
 661                                 session->receive_space - 1, &bytes_read, NULL);
 662
 663         debug(session->web, "bytes read %zu", bytes_read);
 664
 665         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 666                 session->transport_watch = 0;
 667                 session->result.buffer = NULL;
 668                 session->result.length = 0;
 669                 call_result_func(session, 0);
 670                 return FALSE;
 671         }
 672
 673         session->receive_buffer[bytes_read] = '\0';
 674
 675         if (session->header_done == TRUE) {
 676                 if (handle_body(session, session->receive_buffer,
 677                                                         bytes_read) < 0) {
 678                         session->transport_watch = 0;
 679                         return FALSE;
 680                 }
 681                 return TRUE;
 682         }
 683
 684         while (bytes_read > 0) {
 685                 guint8 *pos;
 686                 gsize count;
 687                 char *str;
 688
 689                 pos = memchr(ptr, '\n', bytes_read);
 690                 if (pos == NULL) {
 691                         g_string_append_len(session->current_header,
 692                                                 (gchar *) ptr, bytes_read);
 693                         return TRUE;
 694                 }
 695
 696                 *pos = '\0';
 697                 count = strlen((char *) ptr);
 698                 if (count > 0 && ptr[count - 1] == '\r') {
 699                         ptr[--count] = '\0';
 700                         bytes_read--;
 701                 }
 702
 703                 g_string_append_len(session->current_header,
 704                                                 (gchar *) ptr, count);
 705
 706                 bytes_read -= count + 1;
 707                 if (bytes_read > 0)
 708                         ptr = pos + 1;
 709                 else
 710                         ptr = NULL;
 711
 712                 if (session->current_header->len == 0) {
 713                         session->header_done = TRUE;
 714                         if (handle_body(session, ptr, bytes_read) < 0) {
 715                                 session->transport_watch = 0;
 716                                 return FALSE;
 717                         }
 718                         break;
 719                 }
 720
 721                 str = session->current_header->str;
 722
 723                 if (session->result.status == 0) {
 724                         unsigned int code;
 725
 726                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 727                                 session->result.status = code;
 728                 } else if (session->result.use_chunk == FALSE &&
 729                                 g_ascii_strncasecmp("Transfer-Encoding:",
 730                                                                 str, 18) == 0) {
 731                         char *val;
 732
 733                         val = g_strrstr(str + 18, "chunked");
 734                         if (val != NULL) {
 735                                 session->result.use_chunk = TRUE;
 736
 737                                 session->chunck_state = CHUNK_SIZE;
 738                                 session->chunk_left = 0;
 739                                 session->chunk_left = 0;
 740                                 session->total_len = 0;
 741                         }
 742                 }
 743
 744                 debug(session->web, "[header] %s", str);
 745
 746                 g_string_truncate(session->current_header, 0);
 747         }
 748
 749         return TRUE;
 750 }
 751
 752 static int connect_session_transport(struct web_session *session)
 753 {
 754         GIOFlags flags;
 755         struct sockaddr_in sin;
 756         int sk;
 757
 758         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 759         if (sk < 0)
 760                 return -EIO;
 761
 762         if (session->flags & SESSION_FLAG_USE_TLS)
 763                 session->transport_channel = g_io_channel_gnutls_new(sk);
 764         else
 765                 session->transport_channel = g_io_channel_unix_new(sk);
 766
 767         if (session->transport_channel == NULL) {
 768                 close(sk);
 769                 return -ENOMEM;
 770         }
 771
 772         flags = g_io_channel_get_flags(session->transport_channel);
 773         g_io_channel_set_flags(session->transport_channel,
 774                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 775
 776         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 777         g_io_channel_set_buffered(session->transport_channel, FALSE);
 778
 779         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 780
 781         memset(&sin, 0, sizeof(sin));
 782         sin.sin_family = AF_INET;
 783         sin.sin_port = htons(session->port);
 784         sin.sin_addr.s_addr = inet_addr(session->address);
 785
 786         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 787                 if (errno != EINPROGRESS) {
 788                         close(sk);
 789                         return -EIO;
 790                 }
 791         }
 792
 793         session->transport_watch = g_io_add_watch(session->transport_channel,
 794                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 795                                                 received_data, session);
 796
 797         session->send_watch = g_io_add_watch(session->transport_channel,
 798                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 799                                                 send_data, session);
 800
 801         return 0;
 802 }
 803
 804 static int create_transport(struct web_session *session)
 805 {
 806         int err;
 807
 808         err = connect_session_transport(session);
 809         if (err < 0)
 810                 return err;
 811
 812         debug(session->web, "creating session %s:%u",
 813                                         session->address, session->port);
 814
 815         return 0;
 816 }
 817
 818 static int parse_url(struct web_session *session, const char *url)
 819 {
 820         char *scheme, *host, *port, *path;
 821
 822         scheme = g_strdup(url);
 823         if (scheme == NULL)
 824                 return -EINVAL;
 825
 826         host = strstr(scheme, "://");
 827         if (host != NULL) {
 828                 *host = '\0';
 829                 host += 3;
 830
 831                 if (strcasecmp(scheme, "https") == 0) {
 832                         session->port = 443;
 833                         session->flags |= SESSION_FLAG_USE_TLS;
 834                 } else if (strcasecmp(scheme, "http") == 0) {
 835                         session->port = 80;
 836                 } else {
 837                         g_free(scheme);
 838                         return -EINVAL;
 839                 }
 840         } else {
 841                 host = scheme;
 842                 session->port = 80;
 843         }
 844
 845         path = strchr(host, '/');
 846         if (path != NULL)
 847                 *(path++) = '\0';
 848
 849         session->request = g_strdup_printf("/%s", path ? path : "");
 850
 851         port = strrchr(host, ':');
 852         if (port != NULL) {
 853                 char *end;
 854                 int tmp = strtol(port + 1, &end, 10);
 855
 856                 if (*end == '\0') {
 857                         *port = '\0';
 858                         session->port = tmp;
 859                 }
 860         }
 861
 862         session->host = g_strdup(host);
 863
 864         g_free(scheme);
 865
 866         return 0;
 867 }
 868
 869 static void resolv_result(GResolvResultStatus status,
 870                                         char **results, gpointer user_data)
 871 {
 872         struct web_session *session = user_data;
 873
 874         if (results == NULL || results[0] == NULL) {
 875                 call_result_func(session, 404);
 876                 return;
 877         }
 878
 879         debug(session->web, "address %s", results[0]);
 880
 881         if (inet_aton(results[0], NULL) == 0) {
 882                 call_result_func(session, 400);
 883                 return;
 884         }
 885
 886         session->address = g_strdup(results[0]);
 887
 888         if (create_transport(session) < 0) {
 889                 call_result_func(session, 409);
 890                 return;
 891         }
 892 }
 893
 894 static guint do_request(GWeb *web, const char *url,
 895                                 const char *type, GWebInputFunc input,
 896                                 GWebResultFunc func, gpointer user_data)
 897 {
 898         struct web_session *session;
 899
 900         if (web == NULL || url == NULL)
 901                 return 0;
 902
 903         debug(web, "request %s", url);
 904
 905         session = g_try_new0(struct web_session, 1);
 906         if (session == NULL)
 907                 return 0;
 908
 909         if (parse_url(session, url) < 0) {
 910                 free_session(session);
 911                 return 0;
 912         }
 913
 914         debug(web, "host %s:%u", session->host, session->port);
 915         debug(web, "flags %lu", session->flags);
 916
 917         if (type != NULL) {
 918                 session->content_type = g_strdup(type);
 919
 920                 debug(web, "content-type %s", session->content_type);
 921         }
 922
 923         session->web = web;
 924
 925         session->result_func = func;
 926         session->input_func = input;
 927         session->user_data = user_data;
 928
 929         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 930         if (session->receive_buffer == NULL) {
 931                 free_session(session);
 932                 return 0;
 933         }
 934
 935         session->receive_space = DEFAULT_BUFFER_SIZE;
 936         session->send_buffer = g_string_sized_new(0);
 937         session->current_header = g_string_sized_new(0);
 938         session->header_done = FALSE;
 939         session->body_done = FALSE;
 940
 941         if (inet_aton(session->host, NULL) == 0) {
 942                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 943                                         session->host, resolv_result, session);
 944                 if (session->resolv_action == 0) {
 945                         free_session(session);
 946                         return 0;
 947                 }
 948         } else {
 949                 session->address = g_strdup(session->host);
 950
 951                 if (create_transport(session) < 0) {
 952                         free_session(session);
 953                         return 0;
 954                 }
 955         }
 956
 957         web->session_list = g_list_append(web->session_list, session);
 958
 959         return web->next_query_id++;
 960 }
 961
 962 guint g_web_request_get(GWeb *web, const char *url,
 963                                 GWebResultFunc func, gpointer user_data)
 964 {
 965         return do_request(web, url, NULL, NULL, func, user_data);
 966 }
 967
 968 guint g_web_request_post(GWeb *web, const char *url,
 969                                 const char *type, GWebInputFunc input,
 970                                 GWebResultFunc func, gpointer user_data)
 971 {
 972         return do_request(web, url, type, input, func, user_data);
 973 }
 974
 975 gboolean g_web_cancel_request(GWeb *web, guint id)
 976 {
 977         if (web == NULL)
 978                 return FALSE;
 979
 980         return TRUE;
 981 }
 982
 983 guint16 g_web_result_get_status(GWebResult *result)
 984 {
 985         if (result == NULL)
 986                 return 0;
 987
 988         return result->status;
 989 }
 990
 991 gboolean g_web_result_get_chunk(GWebResult *result,
 992                                 const guint8 **chunk, gsize *length)
 993 {
 994         if (result == NULL)
 995                 return FALSE;
 996
 997         if (chunk == NULL)
 998                 return FALSE;
 999
1000         *chunk = result->buffer;
1001
1002         if (length != NULL)
1003                 *length = result->length;
1004
1005         return TRUE;
1006 }
1007
1008 struct _GWebParser {
1009         gint ref_count;
1010         char *begin_token;
1011         char *end_token;
1012         const char *token_str;
1013         size_t token_len;
1014         size_t token_pos;
1015         gboolean intoken;
1016         GString *content;
1017         GWebParserFunc func;
1018         gpointer user_data;
1019 };
1020
1021 GWebParser *g_web_parser_new(const char *begin, const char *end,
1022                                 GWebParserFunc func, gpointer user_data)
1023 {
1024         GWebParser *parser;
1025
1026         parser = g_try_new0(GWebParser, 1);
1027         if (parser == NULL)
1028                 return NULL;
1029
1030         parser->ref_count = 1;
1031
1032         parser->begin_token = g_strdup(begin);
1033         parser->end_token = g_strdup(end);
1034
1035         if (parser->begin_token == NULL) {
1036                 g_free(parser);
1037                 return NULL;
1038         }
1039
1040         parser->func = func;
1041         parser->user_data = user_data;
1042
1043         parser->token_str = parser->begin_token;
1044         parser->token_len = strlen(parser->token_str);
1045         parser->token_pos = 0;
1046
1047         parser->intoken = FALSE;
1048         parser->content = g_string_sized_new(0);
1049
1050         return parser;
1051 }
1052
1053 GWebParser *g_web_parser_ref(GWebParser *parser)
1054 {
1055         if (parser == NULL)
1056                 return NULL;
1057
1058         g_atomic_int_inc(&parser->ref_count);
1059
1060         return parser;
1061 }
1062
1063 void g_web_parser_unref(GWebParser *parser)
1064 {
1065         if (parser == NULL)
1066                 return;
1067
1068         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1069                 return;
1070
1071         g_string_free(parser->content, TRUE);
1072
1073         g_free(parser->begin_token);
1074         g_free(parser->end_token);
1075         g_free(parser);
1076 }
1077
1078 void g_web_parser_feed_data(GWebParser *parser,
1079                                 const guint8 *data, gsize length)
1080 {
1081         const guint8 *ptr = data;
1082
1083         if (parser == NULL)
1084                 return;
1085
1086         while (length > 0) {
1087                 guint8 chr = parser->token_str[parser->token_pos];
1088
1089                 if (parser->token_pos == 0) {
1090                         guint8 *pos;
1091
1092                         pos = memchr(ptr, chr, length);
1093                         if (pos == NULL) {
1094                                 if (parser->intoken == TRUE)
1095                                         g_string_append_len(parser->content,
1096                                                         (gchar *) ptr, length);
1097                                 break;
1098                         }
1099
1100                         if (parser->intoken == TRUE)
1101                                 g_string_append_len(parser->content,
1102                                                 (gchar *) ptr, (pos - ptr) + 1);
1103
1104                         length -= (pos - ptr) + 1;
1105                         ptr = pos + 1;
1106
1107                         parser->token_pos++;
1108                         continue;
1109                 }
1110
1111                 if (parser->intoken == TRUE)
1112                         g_string_append_c(parser->content, ptr[0]);
1113
1114                 if (ptr[0] != chr) {
1115                         length--;
1116                         ptr++;
1117
1118                         parser->token_pos = 0;
1119                         continue;
1120                 }
1121
1122                 length--;
1123                 ptr++;
1124
1125                 parser->token_pos++;
1126
1127                 if (parser->token_pos == parser->token_len) {
1128                         if (parser->intoken == FALSE) {
1129                                 g_string_append(parser->content,
1130                                                         parser->token_str);
1131
1132                                 parser->intoken = TRUE;
1133                                 parser->token_str = parser->end_token;
1134                                 parser->token_len = strlen(parser->end_token);
1135                                 parser->token_pos = 0;
1136                         } else {
1137                                 char *str;
1138                                 str = g_string_free(parser->content, FALSE);
1139                                 parser->content = g_string_sized_new(0);
1140                                 if (parser->func)
1141                                         parser->func(str, parser->user_data);
1142                                 g_free(str);
1143
1144                                 parser->intoken = FALSE;
1145                                 parser->token_str = parser->begin_token;
1146                                 parser->token_len = strlen(parser->begin_token);
1147                                 parser->token_pos = 0;
1148                         }
1149                 }
1150         }
1151 }
1152
1153 void g_web_parser_end_data(GWebParser *parser)
1154 {
1155         if (parser == NULL)
1156                 return;
1157 }