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         gboolean result;
 365
 366         if (session->result_func == NULL)
 367                 return;
 368
 369         if (status != 0)
 370                 session->result.status = status;
 371
 372         result = session->result_func(&session->result, session->user_data);
 373
 374         debug(session->web, "[result function] %s",
 375                                         result == TRUE ? "continue" : "stop");
 376 }
 377
 378 static gboolean process_send_buffer(struct web_session *session)
 379 {
 380         GString *buf = session->send_buffer;
 381         gsize count, bytes_written;
 382         GIOStatus status;
 383
 384         count = buf->len;
 385
 386         if (count == 0) {
 387                 if (session->request_started == TRUE &&
 388                                         session->more_data == FALSE)
 389                         session->body_done = TRUE;
 390
 391                 return FALSE;
 392         }
 393
 394         debug(session->web, "bytes to write %zu", count);
 395
 396         status = g_io_channel_write_chars(session->transport_channel,
 397                                         buf->str, count, &bytes_written, NULL);
 398
 399         debug(session->web, "status %u bytes written %zu",
 400                                         status, bytes_written);
 401
 402         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 403                 return FALSE;
 404
 405         g_string_erase(buf, 0, bytes_written);
 406
 407         return TRUE;
 408 }
 409
 410 static void process_next_chunk(struct web_session *session)
 411 {
 412         GString *buf = session->send_buffer;
 413         const guint8 *body;
 414         gsize length;
 415
 416         if (session->input_func == NULL) {
 417                 session->more_data = FALSE;
 418                 return;
 419         }
 420
 421         session->more_data = session->input_func(&body, &length,
 422                                                 session->user_data);
 423
 424         if (length > 0) {
 425                 g_string_append_printf(buf, "%zx\r\n", length);
 426                 g_string_append_len(buf, (char *) body, length);
 427                 g_string_append(buf, "\r\n");
 428         }
 429
 430         if (session->more_data == FALSE)
 431                 g_string_append(buf, "0\r\n\r\n");
 432 }
 433
 434 static void start_request(struct web_session *session)
 435 {
 436         GString *buf = session->send_buffer;
 437         const char *version;
 438         const guint8 *body;
 439         gsize length;
 440
 441         debug(session->web, "request %s from %s",
 442                                         session->request, session->host);
 443
 444         g_string_truncate(buf, 0);
 445
 446         if (session->web->http_version == NULL)
 447                 version = "1.1";
 448         else
 449                 version = session->web->http_version;
 450
 451         if (session->content_type == NULL)
 452                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 453                                                 session->request, version);
 454         else
 455                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 456                                                 session->request, version);
 457
 458         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 459
 460         if (session->web->user_agent != NULL)
 461                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 462                                                 session->web->user_agent);
 463
 464         if (session->web->accept_option != NULL)
 465                 g_string_append_printf(buf, "Accept: %s\r\n",
 466                                                 session->web->accept_option);
 467
 468         if (session->content_type != NULL) {
 469                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 470                                                         session->content_type);
 471                 if (session->input_func == NULL) {
 472                         session->more_data = FALSE;
 473                         length = 0;
 474                 } else
 475                         session->more_data = session->input_func(&body, &length,
 476                                                         session->user_data);
 477                 if (session->more_data == FALSE)
 478                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 479                                                                         length);
 480                 else
 481                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 482         }
 483
 484         if (session->web->close_connection == TRUE)
 485                 g_string_append(buf, "Connection: close\r\n");
 486
 487         g_string_append(buf, "\r\n");
 488
 489         if (session->content_type != NULL && length > 0) {
 490                 if (session->more_data == TRUE) {
 491                         g_string_append_printf(buf, "%zx\r\n", length);
 492                         g_string_append_len(buf, (char *) body, length);
 493                         g_string_append(buf, "\r\n");
 494                 } else
 495                         g_string_append_len(buf, (char *) body, length);
 496         }
 497 }
 498
 499 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 500                                                 gpointer user_data)
 501 {
 502         struct web_session *session = user_data;
 503
 504         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 505                 session->send_watch = 0;
 506                 return FALSE;
 507         }
 508
 509         if (process_send_buffer(session) == TRUE)
 510                 return TRUE;
 511
 512         if (session->request_started == FALSE) {
 513                 session->request_started = TRUE;
 514                 start_request(session);
 515         } else if (session->more_data == TRUE)
 516                 process_next_chunk(session);
 517
 518         process_send_buffer(session);
 519
 520         if (session->body_done == TRUE) {
 521                 session->send_watch = 0;
 522                 return FALSE;
 523         }
 524
 525         return TRUE;
 526 }
 527
 528 static int decode_chunked(struct web_session *session,
 529                                         const guint8 *buf, gsize len)
 530 {
 531         const guint8 *ptr = buf;
 532         gsize counter;
 533
 534         while (len > 0) {
 535                 guint8 *pos;
 536                 gsize count;
 537                 char *str;
 538
 539                 switch (session->chunck_state) {
 540                 case CHUNK_SIZE:
 541                         pos = memchr(ptr, '\n', len);
 542                         if (pos == NULL) {
 543                                 g_string_append_len(session->current_header,
 544                                                 (gchar *) ptr, len);
 545                                 return 0;
 546                         }
 547
 548                         count = pos - ptr;
 549                         if (count < 1 || ptr[count - 1] != '\r')
 550                                 return -EILSEQ;
 551
 552                         g_string_append_len(session->current_header,
 553                                                 (gchar *) ptr, count);
 554
 555                         len -= count + 1;
 556                         ptr = pos + 1;
 557
 558                         str = session->current_header->str;
 559
 560                         counter = strtoul(str, NULL, 16);
 561                         if ((counter == 0 && errno == EINVAL) ||
 562                                                 counter == ULONG_MAX)
 563                                 return -EILSEQ;
 564
 565                         session->chunk_size = counter;
 566                         session->chunk_left = counter;
 567
 568                         session->chunck_state = CHUNK_DATA;
 569                         break;
 570                 case CHUNK_R_BODY:
 571                         if (*ptr != '\r')
 572                                 return -EILSEQ;
 573                         ptr++;
 574                         len--;
 575                         session->chunck_state = CHUNK_N_BODY;
 576                         break;
 577                 case CHUNK_N_BODY:
 578                         if (*ptr != '\n')
 579                                 return -EILSEQ;
 580                         ptr++;
 581                         len--;
 582                         session->chunck_state = CHUNK_SIZE;
 583                         break;
 584                 case CHUNK_DATA:
 585                         if (session->chunk_size == 0) {
 586                                 debug(session->web, "Download Done in chunk");
 587                                 g_string_truncate(session->current_header, 0);
 588                                 return 0;
 589                         }
 590
 591                         if (session->chunk_left <= len) {
 592                                 session->result.buffer = ptr;
 593                                 session->result.length = session->chunk_left;
 594                                 call_result_func(session, 0);
 595
 596                                 len -= session->chunk_left;
 597                                 ptr += session->chunk_left;
 598
 599                                 session->total_len += session->chunk_left;
 600                                 session->chunk_left = 0;
 601
 602                                 g_string_truncate(session->current_header, 0);
 603                                 session->chunck_state = CHUNK_R_BODY;
 604                                 break;
 605                         }
 606                         /* more data */
 607                         session->result.buffer = ptr;
 608                         session->result.length = len;
 609                         call_result_func(session, 0);
 610
 611                         session->chunk_left -= len;
 612                         session->total_len += len;
 613
 614                         len -= len;
 615                         ptr += len;
 616                         break;
 617                 }
 618         }
 619
 620         return 0;
 621 }
 622
 623 static int handle_body(struct web_session *session,
 624                                 const guint8 *buf, gsize len)
 625 {
 626         int err;
 627
 628         debug(session->web, "[body] length %zu", len);
 629
 630         if (session->result.use_chunk == FALSE) {
 631                 session->result.buffer = buf;
 632                 session->result.length = len;
 633                 call_result_func(session, 0);
 634                 return 0;
 635         }
 636
 637         err = decode_chunked(session, buf, len);
 638         if (err < 0) {
 639                 debug(session->web, "Error in chunk decode %d", err);
 640
 641                 session->result.buffer = NULL;
 642                 session->result.length = 0;
 643                 call_result_func(session, 400);
 644         }
 645
 646         return err;
 647 }
 648
 649 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 650                                                         gpointer user_data)
 651 {
 652         struct web_session *session = user_data;
 653         guint8 *ptr = session->receive_buffer;
 654         gsize bytes_read;
 655         GIOStatus status;
 656
 657         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 658                 session->transport_watch = 0;
 659                 session->result.buffer = NULL;
 660                 session->result.length = 0;
 661                 call_result_func(session, 400);
 662                 return FALSE;
 663         }
 664
 665         status = g_io_channel_read_chars(channel,
 666                                 (gchar *) session->receive_buffer,
 667                                 session->receive_space - 1, &bytes_read, NULL);
 668
 669         debug(session->web, "bytes read %zu", bytes_read);
 670
 671         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 672                 session->transport_watch = 0;
 673                 session->result.buffer = NULL;
 674                 session->result.length = 0;
 675                 call_result_func(session, 0);
 676                 return FALSE;
 677         }
 678
 679         session->receive_buffer[bytes_read] = '\0';
 680
 681         if (session->header_done == TRUE) {
 682                 if (handle_body(session, session->receive_buffer,
 683                                                         bytes_read) < 0) {
 684                         session->transport_watch = 0;
 685                         return FALSE;
 686                 }
 687                 return TRUE;
 688         }
 689
 690         while (bytes_read > 0) {
 691                 guint8 *pos;
 692                 gsize count;
 693                 char *str;
 694
 695                 pos = memchr(ptr, '\n', bytes_read);
 696                 if (pos == NULL) {
 697                         g_string_append_len(session->current_header,
 698                                                 (gchar *) ptr, bytes_read);
 699                         return TRUE;
 700                 }
 701
 702                 *pos = '\0';
 703                 count = strlen((char *) ptr);
 704                 if (count > 0 && ptr[count - 1] == '\r') {
 705                         ptr[--count] = '\0';
 706                         bytes_read--;
 707                 }
 708
 709                 g_string_append_len(session->current_header,
 710                                                 (gchar *) ptr, count);
 711
 712                 bytes_read -= count + 1;
 713                 if (bytes_read > 0)
 714                         ptr = pos + 1;
 715                 else
 716                         ptr = NULL;
 717
 718                 if (session->current_header->len == 0) {
 719                         session->header_done = TRUE;
 720                         if (handle_body(session, ptr, bytes_read) < 0) {
 721                                 session->transport_watch = 0;
 722                                 return FALSE;
 723                         }
 724                         break;
 725                 }
 726
 727                 str = session->current_header->str;
 728
 729                 if (session->result.status == 0) {
 730                         unsigned int code;
 731
 732                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 733                                 session->result.status = code;
 734                 } else if (session->result.use_chunk == FALSE &&
 735                                 g_ascii_strncasecmp("Transfer-Encoding:",
 736                                                                 str, 18) == 0) {
 737                         char *val;
 738
 739                         val = g_strrstr(str + 18, "chunked");
 740                         if (val != NULL) {
 741                                 session->result.use_chunk = TRUE;
 742
 743                                 session->chunck_state = CHUNK_SIZE;
 744                                 session->chunk_left = 0;
 745                                 session->chunk_left = 0;
 746                                 session->total_len = 0;
 747                         }
 748                 }
 749
 750                 debug(session->web, "[header] %s", str);
 751
 752                 g_string_truncate(session->current_header, 0);
 753         }
 754
 755         return TRUE;
 756 }
 757
 758 static int connect_session_transport(struct web_session *session)
 759 {
 760         GIOFlags flags;
 761         struct sockaddr_in sin;
 762         int sk;
 763
 764         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 765         if (sk < 0)
 766                 return -EIO;
 767
 768         if (session->flags & SESSION_FLAG_USE_TLS) {
 769                 debug(session->web, "using TLS encryption");
 770                 session->transport_channel = g_io_channel_gnutls_new(sk);
 771         } else {
 772                 debug(session->web, "no encryption");
 773                 session->transport_channel = g_io_channel_unix_new(sk);
 774         }
 775
 776         if (session->transport_channel == NULL) {
 777                 close(sk);
 778                 return -ENOMEM;
 779         }
 780
 781         flags = g_io_channel_get_flags(session->transport_channel);
 782         g_io_channel_set_flags(session->transport_channel,
 783                                         flags | G_IO_FLAG_NONBLOCK, NULL);
 784
 785         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 786         g_io_channel_set_buffered(session->transport_channel, FALSE);
 787
 788         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 789
 790         memset(&sin, 0, sizeof(sin));
 791         sin.sin_family = AF_INET;
 792         sin.sin_port = htons(session->port);
 793         sin.sin_addr.s_addr = inet_addr(session->address);
 794
 795         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 796                 if (errno != EINPROGRESS) {
 797                         close(sk);
 798                         return -EIO;
 799                 }
 800         }
 801
 802         session->transport_watch = g_io_add_watch(session->transport_channel,
 803                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 804                                                 received_data, session);
 805
 806         session->send_watch = g_io_add_watch(session->transport_channel,
 807                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 808                                                 send_data, session);
 809
 810         return 0;
 811 }
 812
 813 static int create_transport(struct web_session *session)
 814 {
 815         int err;
 816
 817         err = connect_session_transport(session);
 818         if (err < 0)
 819                 return err;
 820
 821         debug(session->web, "creating session %s:%u",
 822                                         session->address, session->port);
 823
 824         return 0;
 825 }
 826
 827 static int parse_url(struct web_session *session, const char *url)
 828 {
 829         char *scheme, *host, *port, *path;
 830
 831         scheme = g_strdup(url);
 832         if (scheme == NULL)
 833                 return -EINVAL;
 834
 835         host = strstr(scheme, "://");
 836         if (host != NULL) {
 837                 *host = '\0';
 838                 host += 3;
 839
 840                 if (strcasecmp(scheme, "https") == 0) {
 841                         session->port = 443;
 842                         session->flags |= SESSION_FLAG_USE_TLS;
 843                 } else if (strcasecmp(scheme, "http") == 0) {
 844                         session->port = 80;
 845                 } else {
 846                         g_free(scheme);
 847                         return -EINVAL;
 848                 }
 849         } else {
 850                 host = scheme;
 851                 session->port = 80;
 852         }
 853
 854         path = strchr(host, '/');
 855         if (path != NULL)
 856                 *(path++) = '\0';
 857
 858         session->request = g_strdup_printf("/%s", path ? path : "");
 859
 860         port = strrchr(host, ':');
 861         if (port != NULL) {
 862                 char *end;
 863                 int tmp = strtol(port + 1, &end, 10);
 864
 865                 if (*end == '\0') {
 866                         *port = '\0';
 867                         session->port = tmp;
 868                 }
 869         }
 870
 871         session->host = g_strdup(host);
 872
 873         g_free(scheme);
 874
 875         return 0;
 876 }
 877
 878 static void resolv_result(GResolvResultStatus status,
 879                                         char **results, gpointer user_data)
 880 {
 881         struct web_session *session = user_data;
 882
 883         if (results == NULL || results[0] == NULL) {
 884                 call_result_func(session, 404);
 885                 return;
 886         }
 887
 888         debug(session->web, "address %s", results[0]);
 889
 890         if (inet_aton(results[0], NULL) == 0) {
 891                 call_result_func(session, 400);
 892                 return;
 893         }
 894
 895         session->address = g_strdup(results[0]);
 896
 897         if (create_transport(session) < 0) {
 898                 call_result_func(session, 409);
 899                 return;
 900         }
 901 }
 902
 903 static guint do_request(GWeb *web, const char *url,
 904                                 const char *type, GWebInputFunc input,
 905                                 GWebResultFunc func, gpointer user_data)
 906 {
 907         struct web_session *session;
 908
 909         if (web == NULL || url == NULL)
 910                 return 0;
 911
 912         debug(web, "request %s", url);
 913
 914         session = g_try_new0(struct web_session, 1);
 915         if (session == NULL)
 916                 return 0;
 917
 918         if (parse_url(session, url) < 0) {
 919                 free_session(session);
 920                 return 0;
 921         }
 922
 923         debug(web, "host %s:%u", session->host, session->port);
 924         debug(web, "flags %lu", session->flags);
 925
 926         if (type != NULL) {
 927                 session->content_type = g_strdup(type);
 928
 929                 debug(web, "content-type %s", session->content_type);
 930         }
 931
 932         session->web = web;
 933
 934         session->result_func = func;
 935         session->input_func = input;
 936         session->user_data = user_data;
 937
 938         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 939         if (session->receive_buffer == NULL) {
 940                 free_session(session);
 941                 return 0;
 942         }
 943
 944         session->receive_space = DEFAULT_BUFFER_SIZE;
 945         session->send_buffer = g_string_sized_new(0);
 946         session->current_header = g_string_sized_new(0);
 947         session->header_done = FALSE;
 948         session->body_done = FALSE;
 949
 950         if (inet_aton(session->host, NULL) == 0) {
 951                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 952                                         session->host, resolv_result, session);
 953                 if (session->resolv_action == 0) {
 954                         free_session(session);
 955                         return 0;
 956                 }
 957         } else {
 958                 session->address = g_strdup(session->host);
 959
 960                 if (create_transport(session) < 0) {
 961                         free_session(session);
 962                         return 0;
 963                 }
 964         }
 965
 966         web->session_list = g_list_append(web->session_list, session);
 967
 968         return web->next_query_id++;
 969 }
 970
 971 guint g_web_request_get(GWeb *web, const char *url,
 972                                 GWebResultFunc func, gpointer user_data)
 973 {
 974         return do_request(web, url, NULL, NULL, func, user_data);
 975 }
 976
 977 guint g_web_request_post(GWeb *web, const char *url,
 978                                 const char *type, GWebInputFunc input,
 979                                 GWebResultFunc func, gpointer user_data)
 980 {
 981         return do_request(web, url, type, input, func, user_data);
 982 }
 983
 984 gboolean g_web_cancel_request(GWeb *web, guint id)
 985 {
 986         if (web == NULL)
 987                 return FALSE;
 988
 989         return TRUE;
 990 }
 991
 992 guint16 g_web_result_get_status(GWebResult *result)
 993 {
 994         if (result == NULL)
 995                 return 0;
 996
 997         return result->status;
 998 }
 999
1000 gboolean g_web_result_get_chunk(GWebResult *result,
1001                                 const guint8 **chunk, gsize *length)
1002 {
1003         if (result == NULL)
1004                 return FALSE;
1005
1006         if (chunk == NULL)
1007                 return FALSE;
1008
1009         *chunk = result->buffer;
1010
1011         if (length != NULL)
1012                 *length = result->length;
1013
1014         return TRUE;
1015 }
1016
1017 struct _GWebParser {
1018         gint ref_count;
1019         char *begin_token;
1020         char *end_token;
1021         const char *token_str;
1022         size_t token_len;
1023         size_t token_pos;
1024         gboolean intoken;
1025         GString *content;
1026         GWebParserFunc func;
1027         gpointer user_data;
1028 };
1029
1030 GWebParser *g_web_parser_new(const char *begin, const char *end,
1031                                 GWebParserFunc func, gpointer user_data)
1032 {
1033         GWebParser *parser;
1034
1035         parser = g_try_new0(GWebParser, 1);
1036         if (parser == NULL)
1037                 return NULL;
1038
1039         parser->ref_count = 1;
1040
1041         parser->begin_token = g_strdup(begin);
1042         parser->end_token = g_strdup(end);
1043
1044         if (parser->begin_token == NULL) {
1045                 g_free(parser);
1046                 return NULL;
1047         }
1048
1049         parser->func = func;
1050         parser->user_data = user_data;
1051
1052         parser->token_str = parser->begin_token;
1053         parser->token_len = strlen(parser->token_str);
1054         parser->token_pos = 0;
1055
1056         parser->intoken = FALSE;
1057         parser->content = g_string_sized_new(0);
1058
1059         return parser;
1060 }
1061
1062 GWebParser *g_web_parser_ref(GWebParser *parser)
1063 {
1064         if (parser == NULL)
1065                 return NULL;
1066
1067         g_atomic_int_inc(&parser->ref_count);
1068
1069         return parser;
1070 }
1071
1072 void g_web_parser_unref(GWebParser *parser)
1073 {
1074         if (parser == NULL)
1075                 return;
1076
1077         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
1078                 return;
1079
1080         g_string_free(parser->content, TRUE);
1081
1082         g_free(parser->begin_token);
1083         g_free(parser->end_token);
1084         g_free(parser);
1085 }
1086
1087 void g_web_parser_feed_data(GWebParser *parser,
1088                                 const guint8 *data, gsize length)
1089 {
1090         const guint8 *ptr = data;
1091
1092         if (parser == NULL)
1093                 return;
1094
1095         while (length > 0) {
1096                 guint8 chr = parser->token_str[parser->token_pos];
1097
1098                 if (parser->token_pos == 0) {
1099                         guint8 *pos;
1100
1101                         pos = memchr(ptr, chr, length);
1102                         if (pos == NULL) {
1103                                 if (parser->intoken == TRUE)
1104                                         g_string_append_len(parser->content,
1105                                                         (gchar *) ptr, length);
1106                                 break;
1107                         }
1108
1109                         if (parser->intoken == TRUE)
1110                                 g_string_append_len(parser->content,
1111                                                 (gchar *) ptr, (pos - ptr) + 1);
1112
1113                         length -= (pos - ptr) + 1;
1114                         ptr = pos + 1;
1115
1116                         parser->token_pos++;
1117                         continue;
1118                 }
1119
1120                 if (parser->intoken == TRUE)
1121                         g_string_append_c(parser->content, ptr[0]);
1122
1123                 if (ptr[0] != chr) {
1124                         length--;
1125                         ptr++;
1126
1127                         parser->token_pos = 0;
1128                         continue;
1129                 }
1130
1131                 length--;
1132                 ptr++;
1133
1134                 parser->token_pos++;
1135
1136                 if (parser->token_pos == parser->token_len) {
1137                         if (parser->intoken == FALSE) {
1138                                 g_string_append(parser->content,
1139                                                         parser->token_str);
1140
1141                                 parser->intoken = TRUE;
1142                                 parser->token_str = parser->end_token;
1143                                 parser->token_len = strlen(parser->end_token);
1144                                 parser->token_pos = 0;
1145                         } else {
1146                                 char *str;
1147                                 str = g_string_free(parser->content, FALSE);
1148                                 parser->content = g_string_sized_new(0);
1149                                 if (parser->func)
1150                                         parser->func(str, parser->user_data);
1151                                 g_free(str);
1152
1153                                 parser->intoken = FALSE;
1154                                 parser->token_str = parser->begin_token;
1155                                 parser->token_len = strlen(parser->begin_token);
1156                                 parser->token_pos = 0;
1157                         }
1158                 }
1159         }
1160 }
1161
1162 void g_web_parser_end_data(GWebParser *parser)
1163 {
1164         if (parser == NULL)
1165                 return;
1166 }