gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2013  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 <fcntl.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <stdarg.h>
  32 #include <string.h>
  33 #include <sys/socket.h>
  34 #include <sys/sendfile.h>
  35 #include <sys/stat.h>
  36 #include <arpa/inet.h>
  37 #include <netdb.h>
  38 #include <net/if.h>
  39 #include <netinet/tcp.h>
  40 #include <ifaddrs.h>
  41
  42 #include <tpkp_gnutls.h>
  43
  44 #include "giognutls.h"
  45 #include "gresolv.h"
  46 #include "gweb.h"
  47
  48 #define DEFAULT_BUFFER_SIZE  2048
  49
  50 #define SESSION_FLAG_USE_TLS    (1 << 0)
  51
  52 enum chunk_state {
  53         CHUNK_SIZE,
  54         CHUNK_R_BODY,
  55         CHUNK_N_BODY,
  56         CHUNK_DATA,
  57 };
  58
  59 struct _GWebResult {
  60         guint16 status;
  61         const guint8 *buffer;
  62         gsize length;
  63         bool use_chunk;
  64         gchar *last_key;
  65         GHashTable *headers;
  66 };
  67
  68 struct web_session {
  69         GWeb *web;
  70
  71         char *address;
  72         char *host;
  73         uint16_t port;
  74         unsigned long flags;
  75         struct addrinfo *addr;
  76
  77         char *content_type;
  78
  79         GIOChannel *transport_channel;
  80         guint transport_watch;
  81         guint send_watch;
  82
  83         guint resolv_action;
  84         guint address_action;
  85         char *request;
  86
  87         guint8 *receive_buffer;
  88         gsize receive_space;
  89         GString *send_buffer;
  90         GString *current_header;
  91         bool header_done;
  92         bool body_done;
  93         bool more_data;
  94         bool request_started;
  95
  96         enum chunk_state chunck_state;
  97         gsize chunk_size;
  98         gsize chunk_left;
  99         gsize total_len;
 100
 101         GWebResult result;
 102
 103         GWebResultFunc result_func;
 104         GWebRouteFunc route_func;
 105         GWebInputFunc input_func;
 106         int fd;
 107         gsize length;
 108         gsize offset;
 109         gpointer user_data;
 110 };
 111
 112 struct _GWeb {
 113         int ref_count;
 114
 115         guint next_query_id;
 116
 117         int family;
 118
 119         int index;
 120         GList *session_list;
 121
 122         GResolv *resolv;
 123         char *proxy;
 124         char *accept_option;
 125         char *user_agent;
 126         char *user_agent_profile;
 127         char *http_version;
 128         bool close_connection;
 129
 130         GWebDebugFunc debug_func;
 131         gpointer debug_data;
 132 };
 133
 134 #define debug(web, format, arg...)                              \
 135         _debug(web, __FILE__, __func__, format, ## arg)
 136
 137 static void _debug(GWeb *web, const char *file, const char *caller,
 138                                                 const char *format, ...)
 139 {
 140         char str[256];
 141         va_list ap;
 142         int len;
 143
 144         if (!web->debug_func)
 145                 return;
 146
 147         va_start(ap, format);
 148
 149         if ((len = snprintf(str, sizeof(str), "%s:%s() web %p ",
 150                                                 file, caller, web)) > 0) {
 151                 if (vsnprintf(str + len, sizeof(str) - len, format, ap) > 0)
 152                         web->debug_func(str, web->debug_data);
 153         }
 154
 155         va_end(ap);
 156 }
 157
 158 static void free_session(struct web_session *session)
 159 {
 160         GWeb *web;
 161
 162         if (!session)
 163                 return;
 164
 165         g_free(session->request);
 166
 167         web = session->web;
 168
 169         if (session->address_action > 0)
 170                 g_source_remove(session->address_action);
 171
 172         if (session->resolv_action > 0)
 173                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 174
 175         if (session->transport_watch > 0)
 176                 g_source_remove(session->transport_watch);
 177
 178         if (session->send_watch > 0)
 179                 g_source_remove(session->send_watch);
 180
 181         if (session->transport_channel)
 182                 g_io_channel_unref(session->transport_channel);
 183
 184         g_free(session->result.last_key);
 185
 186         if (session->result.headers)
 187                 g_hash_table_destroy(session->result.headers);
 188
 189         if (session->send_buffer)
 190                 g_string_free(session->send_buffer, TRUE);
 191
 192         if (session->current_header)
 193                 g_string_free(session->current_header, TRUE);
 194
 195         g_free(session->receive_buffer);
 196
 197         g_free(session->content_type);
 198
 199         g_free(session->host);
 200         g_free(session->address);
 201         if (session->addr)
 202                 freeaddrinfo(session->addr);
 203
 204         g_free(session);
 205 }
 206
 207 static void flush_sessions(GWeb *web)
 208 {
 209         GList *list;
 210
 211         for (list = g_list_first(web->session_list);
 212                                         list; list = g_list_next(list))
 213                 free_session(list->data);
 214
 215         g_list_free(web->session_list);
 216         web->session_list = NULL;
 217 }
 218
 219 GWeb *g_web_new(int index)
 220 {
 221         GWeb *web;
 222
 223         if (index < 0)
 224                 return NULL;
 225
 226         web = g_try_new0(GWeb, 1);
 227         if (!web)
 228                 return NULL;
 229
 230         web->ref_count = 1;
 231
 232         web->next_query_id = 1;
 233
 234         web->family = AF_UNSPEC;
 235
 236         web->index = index;
 237         web->session_list = NULL;
 238
 239         web->resolv = g_resolv_new(index);
 240         if (!web->resolv) {
 241                 g_free(web);
 242                 return NULL;
 243         }
 244
 245         web->accept_option = g_strdup("*/*");
 246         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 247         web->close_connection = false;
 248
 249         return web;
 250 }
 251
 252 GWeb *g_web_ref(GWeb *web)
 253 {
 254         if (!web)
 255                 return NULL;
 256
 257         __sync_fetch_and_add(&web->ref_count, 1);
 258
 259         return web;
 260 }
 261
 262 void g_web_unref(GWeb *web)
 263 {
 264         if (!web)
 265                 return;
 266
 267         if (__sync_fetch_and_sub(&web->ref_count, 1) != 1)
 268                 return;
 269
 270         flush_sessions(web);
 271
 272         g_resolv_unref(web->resolv);
 273
 274         g_free(web->proxy);
 275
 276         g_free(web->accept_option);
 277         g_free(web->user_agent);
 278         g_free(web->user_agent_profile);
 279         g_free(web->http_version);
 280
 281         g_free(web);
 282 }
 283
 284 bool g_web_supports_tls(void)
 285 {
 286         return g_io_channel_supports_tls();
 287 }
 288
 289 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 290 {
 291         if (!web)
 292                 return;
 293
 294         web->debug_func = func;
 295         web->debug_data = user_data;
 296
 297         g_resolv_set_debug(web->resolv, func, user_data);
 298 }
 299
 300 bool g_web_set_proxy(GWeb *web, const char *proxy)
 301 {
 302         if (!web)
 303                 return false;
 304
 305         g_free(web->proxy);
 306
 307         if (!proxy) {
 308                 web->proxy = NULL;
 309                 debug(web, "clearing proxy");
 310         } else {
 311                 web->proxy = g_strdup(proxy);
 312                 debug(web, "setting proxy %s", web->proxy);
 313         }
 314
 315         return true;
 316 }
 317
 318 bool g_web_set_address_family(GWeb *web, int family)
 319 {
 320         if (!web)
 321                 return false;
 322
 323         if (family != AF_UNSPEC && family != AF_INET && family != AF_INET6)
 324                 return false;
 325
 326         web->family = family;
 327
 328         g_resolv_set_address_family(web->resolv, family);
 329
 330         return true;
 331 }
 332
 333 bool g_web_add_nameserver(GWeb *web, const char *address)
 334 {
 335         if (!web)
 336                 return false;
 337
 338         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 339
 340         return true;
 341 }
 342
 343 static bool set_accept_option(GWeb *web, const char *format, va_list args)
 344 {
 345         g_free(web->accept_option);
 346
 347         if (!format) {
 348                 web->accept_option = NULL;
 349                 debug(web, "clearing accept option");
 350         } else {
 351                 web->accept_option = g_strdup_vprintf(format, args);
 352                 debug(web, "setting accept %s", web->accept_option);
 353         }
 354
 355         return true;
 356 }
 357
 358 bool g_web_set_accept(GWeb *web, const char *format, ...)
 359 {
 360         va_list args;
 361         bool result;
 362
 363         if (!web)
 364                 return false;
 365
 366         va_start(args, format);
 367         result = set_accept_option(web, format, args);
 368         va_end(args);
 369
 370         return result;
 371 }
 372
 373 static bool set_user_agent(GWeb *web, const char *format, va_list args)
 374 {
 375         g_free(web->user_agent);
 376
 377         if (!format) {
 378                 web->user_agent = NULL;
 379                 debug(web, "clearing user agent");
 380         } else {
 381                 web->user_agent = g_strdup_vprintf(format, args);
 382                 debug(web, "setting user agent %s", web->user_agent);
 383         }
 384
 385         return true;
 386 }
 387
 388 bool g_web_set_user_agent(GWeb *web, const char *format, ...)
 389 {
 390         va_list args;
 391         bool result;
 392
 393         if (!web)
 394                 return false;
 395
 396         va_start(args, format);
 397         result = set_user_agent(web, format, args);
 398         va_end(args);
 399
 400         return result;
 401 }
 402
 403 bool g_web_set_ua_profile(GWeb *web, const char *profile)
 404 {
 405         if (!web)
 406                 return false;
 407
 408         g_free(web->user_agent_profile);
 409
 410         web->user_agent_profile = g_strdup(profile);
 411         debug(web, "setting user agent profile %s", web->user_agent);
 412
 413         return true;
 414 }
 415
 416 bool g_web_set_http_version(GWeb *web, const char *version)
 417 {
 418         if (!web)
 419                 return false;
 420
 421         g_free(web->http_version);
 422
 423         if (!version) {
 424                 web->http_version = NULL;
 425                 debug(web, "clearing HTTP version");
 426         } else {
 427                 web->http_version = g_strdup(version);
 428                 debug(web, "setting HTTP version %s", web->http_version);
 429         }
 430
 431         return true;
 432 }
 433
 434 void g_web_set_close_connection(GWeb *web, bool enabled)
 435 {
 436         if (!web)
 437                 return;
 438
 439         web->close_connection = enabled;
 440 }
 441
 442 bool g_web_get_close_connection(GWeb *web)
 443 {
 444         if (!web)
 445                 return false;
 446
 447         return web->close_connection;
 448 }
 449
 450 static inline void call_result_func(struct web_session *session, guint16 status)
 451 {
 452
 453         if (!session->result_func)
 454                 return;
 455
 456         if (status != 0)
 457                 session->result.status = status;
 458
 459         session->result_func(&session->result, session->user_data);
 460
 461 }
 462
 463 static inline void call_route_func(struct web_session *session)
 464 {
 465         if (session->route_func)
 466                 session->route_func(session->address, session->addr->ai_family,
 467                                 session->web->index, session->user_data);
 468 }
 469
 470 static bool process_send_buffer(struct web_session *session)
 471 {
 472         GString *buf;
 473         gsize count, bytes_written;
 474         GIOStatus status;
 475
 476         if (!session)
 477                 return false;
 478
 479         buf = session->send_buffer;
 480         count = buf->len;
 481
 482         if (count == 0) {
 483                 if (session->request_started &&
 484                                         !session->more_data &&
 485                                         session->fd == -1)
 486                         session->body_done = true;
 487
 488                 return false;
 489         }
 490
 491         status = g_io_channel_write_chars(session->transport_channel,
 492                                         buf->str, count, &bytes_written, NULL);
 493
 494         debug(session->web, "status %u bytes to write %zu bytes written %zu",
 495                                         status, count, bytes_written);
 496
 497         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 498                 return false;
 499
 500         g_string_erase(buf, 0, bytes_written);
 501
 502         return true;
 503 }
 504
 505 static bool process_send_file(struct web_session *session)
 506 {
 507         int sk;
 508         off_t offset;
 509         ssize_t bytes_sent;
 510
 511         if (session->fd == -1)
 512                 return false;
 513
 514         if (!session->request_started || session->more_data)
 515                 return false;
 516
 517         sk = g_io_channel_unix_get_fd(session->transport_channel);
 518         if (sk < 0)
 519                 return false;
 520
 521         offset = session->offset;
 522
 523         bytes_sent = sendfile(sk, session->fd, &offset, session->length);
 524
 525         debug(session->web, "errno: %d, bytes to send %zu / bytes sent %zu",
 526                         errno, session->length, bytes_sent);
 527
 528         if (bytes_sent < 0 && errno != EAGAIN)
 529                 return false;
 530
 531         session->offset = offset;
 532         session->length -= bytes_sent;
 533
 534         if (session->length == 0) {
 535                 session->body_done = true;
 536                 return false;
 537         }
 538
 539         return true;
 540 }
 541
 542 static void process_next_chunk(struct web_session *session)
 543 {
 544         GString *buf = session->send_buffer;
 545         const guint8 *body;
 546         gsize length;
 547
 548         if (!session->input_func) {
 549                 session->more_data = false;
 550                 return;
 551         }
 552
 553         session->more_data = session->input_func(&body, &length,
 554                                                 session->user_data);
 555
 556         if (length > 0) {
 557                 g_string_append_printf(buf, "%zx\r\n", length);
 558                 g_string_append_len(buf, (char *) body, length);
 559                 g_string_append(buf, "\r\n");
 560         }
 561
 562         if (!session->more_data)
 563                 g_string_append(buf, "0\r\n\r\n");
 564 }
 565
 566 static void start_request(struct web_session *session)
 567 {
 568         GString *buf = session->send_buffer;
 569         const char *version;
 570         const guint8 *body;
 571         gsize length;
 572
 573         debug(session->web, "request %s from %s",
 574                                         session->request, session->host);
 575
 576         g_string_truncate(buf, 0);
 577
 578         if (!session->web->http_version)
 579                 version = "1.1";
 580         else
 581                 version = session->web->http_version;
 582
 583         if (!session->content_type)
 584                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 585                                                 session->request, version);
 586         else
 587                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 588                                                 session->request, version);
 589
 590         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 591
 592         if (session->web->user_agent)
 593                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 594                                                 session->web->user_agent);
 595
 596         if (session->web->user_agent_profile) {
 597                 g_string_append_printf(buf, "x-wap-profile: %s\r\n",
 598                                        session->web->user_agent_profile);
 599         }
 600
 601         if (session->web->accept_option)
 602                 g_string_append_printf(buf, "Accept: %s\r\n",
 603                                                 session->web->accept_option);
 604
 605         if (session->content_type) {
 606                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 607                                                         session->content_type);
 608                 if (!session->input_func) {
 609                         session->more_data = false;
 610                         length = session->length;
 611                 } else
 612                         session->more_data = session->input_func(&body, &length,
 613                                                         session->user_data);
 614                 if (!session->more_data)
 615                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 616                                                                         length);
 617                 else
 618                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 619         }
 620
 621         if (session->web->close_connection)
 622                 g_string_append(buf, "Connection: close\r\n");
 623
 624         g_string_append(buf, "\r\n");
 625
 626         if (session->content_type && length > 0) {
 627                 if (session->more_data) {
 628                         g_string_append_printf(buf, "%zx\r\n", length);
 629                         g_string_append_len(buf, (char *) body, length);
 630                         g_string_append(buf, "\r\n");
 631                 } else if (session->fd == -1)
 632                         g_string_append_len(buf, (char *) body, length);
 633         }
 634 }
 635
 636 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 637                                                 gpointer user_data)
 638 {
 639         struct web_session *session = user_data;
 640
 641         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 642                 session->send_watch = 0;
 643                 return FALSE;
 644         }
 645
 646         if (process_send_buffer(session))
 647                 return TRUE;
 648
 649         if (process_send_file(session))
 650                 return TRUE;
 651
 652         if (!session->request_started) {
 653                 session->request_started = true;
 654                 start_request(session);
 655         } else if (session->more_data)
 656                 process_next_chunk(session);
 657
 658         process_send_buffer(session);
 659
 660         if (session->body_done) {
 661                 session->send_watch = 0;
 662                 return FALSE;
 663         }
 664
 665         return TRUE;
 666 }
 667
 668 static int decode_chunked(struct web_session *session,
 669                                         const guint8 *buf, gsize len)
 670 {
 671         const guint8 *ptr = buf;
 672         gsize counter;
 673
 674         while (len > 0) {
 675                 guint8 *pos;
 676                 gsize count;
 677                 char *str;
 678
 679                 switch (session->chunck_state) {
 680                 case CHUNK_SIZE:
 681                         pos = memchr(ptr, '\n', len);
 682                         if (!pos) {
 683                                 g_string_append_len(session->current_header,
 684                                                 (gchar *) ptr, len);
 685                                 return 0;
 686                         }
 687
 688                         count = pos - ptr;
 689                         if (count < 1 || ptr[count - 1] != '\r')
 690                                 return -EILSEQ;
 691
 692                         g_string_append_len(session->current_header,
 693                                                 (gchar *) ptr, count);
 694
 695                         len -= count + 1;
 696                         ptr = pos + 1;
 697
 698                         str = session->current_header->str;
 699
 700                         counter = strtoul(str, NULL, 16);
 701                         if ((counter == 0 && errno == EINVAL) ||
 702                                                 counter == ULONG_MAX)
 703                                 return -EILSEQ;
 704
 705                         session->chunk_size = counter;
 706                         session->chunk_left = counter;
 707
 708                         session->chunck_state = CHUNK_DATA;
 709                         break;
 710                 case CHUNK_R_BODY:
 711                         if (*ptr != '\r')
 712                                 return -EILSEQ;
 713                         ptr++;
 714                         len--;
 715                         session->chunck_state = CHUNK_N_BODY;
 716                         break;
 717                 case CHUNK_N_BODY:
 718                         if (*ptr != '\n')
 719                                 return -EILSEQ;
 720                         ptr++;
 721                         len--;
 722                         session->chunck_state = CHUNK_SIZE;
 723                         break;
 724                 case CHUNK_DATA:
 725                         if (session->chunk_size == 0) {
 726                                 debug(session->web, "Download Done in chunk");
 727                                 g_string_truncate(session->current_header, 0);
 728                                 return 0;
 729                         }
 730
 731                         if (session->chunk_left <= len) {
 732                                 session->result.buffer = ptr;
 733                                 session->result.length = session->chunk_left;
 734                                 call_result_func(session, 0);
 735
 736                                 len -= session->chunk_left;
 737                                 ptr += session->chunk_left;
 738
 739                                 session->total_len += session->chunk_left;
 740                                 session->chunk_left = 0;
 741
 742                                 g_string_truncate(session->current_header, 0);
 743                                 session->chunck_state = CHUNK_R_BODY;
 744                                 break;
 745                         }
 746                         /* more data */
 747                         session->result.buffer = ptr;
 748                         session->result.length = len;
 749                         call_result_func(session, 0);
 750
 751                         session->chunk_left -= len;
 752                         session->total_len += len;
 753
 754                         len -= len;
 755                         ptr += len;
 756                         break;
 757                 }
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int handle_body(struct web_session *session,
 764                                 const guint8 *buf, gsize len)
 765 {
 766         int err;
 767
 768         debug(session->web, "[body] length %zu", len);
 769
 770         if (!session->result.use_chunk) {
 771                 if (len > 0) {
 772                         session->result.buffer = buf;
 773                         session->result.length = len;
 774                         call_result_func(session, 0);
 775                 }
 776                 return 0;
 777         }
 778
 779         err = decode_chunked(session, buf, len);
 780         if (err < 0) {
 781                 debug(session->web, "Error in chunk decode %d", err);
 782
 783                 session->result.buffer = NULL;
 784                 session->result.length = 0;
 785                 call_result_func(session, 400);
 786         }
 787
 788         return err;
 789 }
 790
 791 static void handle_multi_line(struct web_session *session)
 792 {
 793         gsize count;
 794         char *str;
 795         gchar *value;
 796
 797         str = session->current_header->str;
 798
 799         if (str[0] != ' ' && str[0] != '\t')
 800                 return;
 801
 802         while (str[0] == ' ' || str[0] == '\t')
 803                 str++;
 804
 805         count = str - session->current_header->str;
 806         if (count > 0) {
 807                 g_string_erase(session->current_header, 0, count);
 808                 g_string_insert_c(session->current_header, 0, ' ');
 809         }
 810
 811 #if defined TIZEN_EXT
 812         if (session->result.last_key == NULL)
 813                 return;
 814 #endif
 815         value = g_hash_table_lookup(session->result.headers,
 816                                         session->result.last_key);
 817         if (value) {
 818                 g_string_insert(session->current_header, 0, value);
 819
 820                 str = session->current_header->str;
 821
 822                 g_hash_table_replace(session->result.headers,
 823                                         g_strdup(session->result.last_key),
 824                                         g_strdup(str));
 825         }
 826 }
 827
 828 static void add_header_field(struct web_session *session)
 829 {
 830         gsize count;
 831         guint8 *pos;
 832         char *str;
 833         gchar *value;
 834         gchar *key;
 835
 836         str = session->current_header->str;
 837
 838         pos = memchr(str, ':', session->current_header->len);
 839         if (pos) {
 840                 *pos = '\0';
 841                 pos++;
 842
 843                 key = g_strdup(str);
 844
 845                 /* remove preceding white spaces */
 846                 while (*pos == ' ')
 847                         pos++;
 848
 849                 count = (char *) pos - str;
 850
 851                 g_string_erase(session->current_header, 0, count);
 852
 853                 value = g_hash_table_lookup(session->result.headers, key);
 854                 if (value) {
 855                         g_string_insert_c(session->current_header, 0, ' ');
 856                         g_string_insert_c(session->current_header, 0, ';');
 857
 858                         g_string_insert(session->current_header, 0, value);
 859                 }
 860
 861                 str = session->current_header->str;
 862                 g_hash_table_replace(session->result.headers, key,
 863                                                         g_strdup(str));
 864
 865                 g_free(session->result.last_key);
 866                 session->result.last_key = g_strdup(key);
 867         }
 868 }
 869
 870 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 871                                                         gpointer user_data)
 872 {
 873         struct web_session *session = user_data;
 874         guint8 *ptr = session->receive_buffer;
 875         gsize bytes_read;
 876         GIOStatus status;
 877
 878         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 879                 session->transport_watch = 0;
 880                 session->result.buffer = NULL;
 881                 session->result.length = 0;
 882                 call_result_func(session, 400);
 883                 return FALSE;
 884         }
 885
 886         status = g_io_channel_read_chars(channel,
 887                                 (gchar *) session->receive_buffer,
 888                                 session->receive_space - 1, &bytes_read, NULL);
 889
 890         debug(session->web, "bytes read %zu", bytes_read);
 891
 892         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 893                 session->transport_watch = 0;
 894                 session->result.buffer = NULL;
 895                 session->result.length = 0;
 896                 call_result_func(session, 0);
 897                 return FALSE;
 898         }
 899
 900         session->receive_buffer[bytes_read] = '\0';
 901
 902         if (session->header_done) {
 903                 if (handle_body(session, session->receive_buffer,
 904                                                         bytes_read) < 0) {
 905                         session->transport_watch = 0;
 906                         return FALSE;
 907                 }
 908                 return TRUE;
 909         }
 910
 911         while (bytes_read > 0) {
 912                 guint8 *pos;
 913                 gsize count;
 914                 char *str;
 915
 916                 pos = memchr(ptr, '\n', bytes_read);
 917                 if (!pos) {
 918                         g_string_append_len(session->current_header,
 919                                                 (gchar *) ptr, bytes_read);
 920                         return TRUE;
 921                 }
 922
 923                 *pos = '\0';
 924                 count = strlen((char *) ptr);
 925                 if (count > 0 && ptr[count - 1] == '\r') {
 926                         ptr[--count] = '\0';
 927                         bytes_read--;
 928                 }
 929
 930                 g_string_append_len(session->current_header,
 931                                                 (gchar *) ptr, count);
 932
 933                 bytes_read -= count + 1;
 934                 if (bytes_read > 0)
 935                         ptr = pos + 1;
 936                 else
 937                         ptr = NULL;
 938
 939                 if (session->current_header->len == 0) {
 940                         char *val;
 941
 942                         session->header_done = true;
 943
 944                         val = g_hash_table_lookup(session->result.headers,
 945                                                         "Transfer-Encoding");
 946                         if (val) {
 947                                 val = g_strrstr(val, "chunked");
 948                                 if (val) {
 949                                         session->result.use_chunk = true;
 950
 951                                         session->chunck_state = CHUNK_SIZE;
 952                                         session->chunk_left = 0;
 953                                         session->total_len = 0;
 954                                 }
 955                         }
 956
 957                         if (handle_body(session, ptr, bytes_read) < 0) {
 958                                 session->transport_watch = 0;
 959                                 return FALSE;
 960                         }
 961                         break;
 962                 }
 963
 964                 str = session->current_header->str;
 965
 966                 if (session->result.status == 0) {
 967                         unsigned int code;
 968
 969                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 970                                 session->result.status = code;
 971                 }
 972
 973                 debug(session->web, "[header] %s", str);
 974
 975                 /* handle multi-line header */
 976                 if (str[0] == ' ' || str[0] == '\t')
 977                         handle_multi_line(session);
 978                 else
 979                         add_header_field(session);
 980
 981                 g_string_truncate(session->current_header, 0);
 982         }
 983
 984         return TRUE;
 985 }
 986
 987 static int bind_to_address(int sk, const char *interface, int family)
 988 {
 989         struct ifaddrs *ifaddr_list, *ifaddr;
 990         int size, err = -1;
 991
 992         if (getifaddrs(&ifaddr_list) < 0)
 993                 return err;
 994
 995         for (ifaddr = ifaddr_list; ifaddr; ifaddr = ifaddr->ifa_next) {
 996                 if (g_strcmp0(ifaddr->ifa_name, interface) != 0)
 997                         continue;
 998
 999                 if (!ifaddr->ifa_addr ||
1000                                 ifaddr->ifa_addr->sa_family != family)
1001                         continue;
1002
1003                 switch (family) {
1004                 case AF_INET:
1005                         size = sizeof(struct sockaddr_in);
1006                         break;
1007                 case AF_INET6:
1008                         size = sizeof(struct sockaddr_in6);
1009                         break;
1010                 default:
1011                         continue;
1012                 }
1013
1014                 err = bind(sk, (struct sockaddr *) ifaddr->ifa_addr, size);
1015                 break;
1016         }
1017
1018         freeifaddrs(ifaddr_list);
1019         return err;
1020 }
1021
1022 static inline int bind_socket(int sk, int index, int family)
1023 {
1024         char interface[IF_NAMESIZE];
1025         int err;
1026
1027         if (!if_indextoname(index, interface))
1028                 return -1;
1029
1030         err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1031                                         interface, IF_NAMESIZE);
1032         if (err < 0)
1033                 err = bind_to_address(sk, interface, family);
1034
1035         return err;
1036 }
1037
1038 static int connect_session_transport(struct web_session *session)
1039 {
1040         GIOFlags flags;
1041         int sk;
1042
1043         sk = socket(session->addr->ai_family, SOCK_STREAM | SOCK_CLOEXEC,
1044                         IPPROTO_TCP);
1045         if (sk < 0)
1046                 return -EIO;
1047
1048         if (session->web->index > 0) {
1049                 if (bind_socket(sk, session->web->index,
1050                                         session->addr->ai_family) < 0) {
1051                         debug(session->web, "bind() %s", strerror(errno));
1052                         close(sk);
1053                         return -EIO;
1054                 }
1055         }
1056
1057         if (session->flags & SESSION_FLAG_USE_TLS) {
1058                 debug(session->web, "using TLS encryption");
1059                 tpkp_gnutls_set_url_data(session->host);
1060                 session->transport_channel = g_io_channel_gnutls_new(sk);
1061         } else {
1062                 debug(session->web, "no encryption");
1063                 session->transport_channel = g_io_channel_unix_new(sk);
1064         }
1065
1066         if (!session->transport_channel) {
1067                 debug(session->web, "channel missing");
1068                 close(sk);
1069                 return -ENOMEM;
1070         }
1071
1072         flags = g_io_channel_get_flags(session->transport_channel);
1073         g_io_channel_set_flags(session->transport_channel,
1074                                         flags | G_IO_FLAG_NONBLOCK, NULL);
1075
1076         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
1077         g_io_channel_set_buffered(session->transport_channel, FALSE);
1078
1079         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
1080
1081         if (connect(sk, session->addr->ai_addr,
1082                         session->addr->ai_addrlen) < 0) {
1083                 if (errno != EINPROGRESS) {
1084                         debug(session->web, "connect() %s", strerror(errno));
1085                         close(sk);
1086                         return -EIO;
1087                 }
1088         }
1089
1090         session->transport_watch = g_io_add_watch(session->transport_channel,
1091                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
1092                                                 received_data, session);
1093
1094         session->send_watch = g_io_add_watch(session->transport_channel,
1095                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
1096                                                 send_data, session);
1097
1098         return 0;
1099 }
1100
1101 static int create_transport(struct web_session *session)
1102 {
1103         int err;
1104
1105         err = connect_session_transport(session);
1106         if (err < 0)
1107                 return err;
1108
1109         debug(session->web, "creating session %s:%u",
1110                                         session->address, session->port);
1111
1112         return 0;
1113 }
1114
1115 static int parse_url(struct web_session *session,
1116                                 const char *url, const char *proxy)
1117 {
1118         char *scheme, *host, *port, *path;
1119
1120         scheme = g_strdup(url);
1121         if (!scheme)
1122                 return -EINVAL;
1123
1124         host = strstr(scheme, "://");
1125         if (host) {
1126                 *host = '\0';
1127                 host += 3;
1128
1129                 if (strcasecmp(scheme, "https") == 0) {
1130                         session->port = 443;
1131                         session->flags |= SESSION_FLAG_USE_TLS;
1132                 } else if (strcasecmp(scheme, "http") == 0) {
1133                         session->port = 80;
1134                 } else {
1135                         g_free(scheme);
1136                         return -EINVAL;
1137                 }
1138         } else {
1139                 host = scheme;
1140                 session->port = 80;
1141         }
1142
1143         path = strchr(host, '/');
1144         if (path)
1145                 *(path++) = '\0';
1146
1147         if (!proxy)
1148                 session->request = g_strdup_printf("/%s", path ? path : "");
1149         else
1150                 session->request = g_strdup(url);
1151
1152         port = strrchr(host, ':');
1153         if (port) {
1154                 char *end;
1155                 int tmp = strtol(port + 1, &end, 10);
1156
1157                 if (*end == '\0') {
1158                         *port = '\0';
1159                         session->port = tmp;
1160                 }
1161
1162                 if (!proxy)
1163                         session->host = g_strdup(host);
1164                 else
1165                         session->host = g_strdup_printf("%s:%u", host, tmp);
1166         } else
1167                 session->host = g_strdup(host);
1168
1169         g_free(scheme);
1170
1171         if (!proxy)
1172                 return 0;
1173
1174         scheme = g_strdup(proxy);
1175         if (!scheme)
1176                 return -EINVAL;
1177
1178         host = strstr(proxy, "://");
1179         if (host) {
1180                 *host = '\0';
1181                 host += 3;
1182
1183                 if (strcasecmp(scheme, "http") != 0) {
1184                         g_free(scheme);
1185                         return -EINVAL;
1186                 }
1187         } else
1188                 host = scheme;
1189
1190         path = strchr(host, '/');
1191         if (path)
1192                 *(path++) = '\0';
1193
1194         port = strrchr(host, ':');
1195         if (port) {
1196                 char *end;
1197                 int tmp = strtol(port + 1, &end, 10);
1198
1199                 if (*end == '\0') {
1200                         *port = '\0';
1201                         session->port = tmp;
1202                 }
1203         }
1204
1205         session->address = g_strdup(host);
1206
1207         g_free(scheme);
1208
1209         return 0;
1210 }
1211
1212 static void handle_resolved_address(struct web_session *session)
1213 {
1214         struct addrinfo hints;
1215         char *port;
1216         int ret;
1217
1218         debug(session->web, "address %s", session->address);
1219
1220         memset(&hints, 0, sizeof(struct addrinfo));
1221         hints.ai_flags = AI_NUMERICHOST;
1222         hints.ai_family = session->web->family;
1223
1224         if (session->addr) {
1225                 freeaddrinfo(session->addr);
1226                 session->addr = NULL;
1227         }
1228
1229         port = g_strdup_printf("%u", session->port);
1230         ret = getaddrinfo(session->address, port, &hints, &session->addr);
1231         g_free(port);
1232         if (ret != 0 || !session->addr) {
1233                 call_result_func(session, 400);
1234                 return;
1235         }
1236
1237         call_route_func(session);
1238
1239         if (create_transport(session) < 0) {
1240                 call_result_func(session, 409);
1241                 return;
1242         }
1243 }
1244
1245 static gboolean already_resolved(gpointer data)
1246 {
1247         struct web_session *session = data;
1248
1249         session->address_action = 0;
1250         handle_resolved_address(session);
1251
1252         return FALSE;
1253 }
1254
1255 static void resolv_result(GResolvResultStatus status,
1256                                         char **results, gpointer user_data)
1257 {
1258         struct web_session *session = user_data;
1259
1260         if (!results || !results[0]) {
1261                 call_result_func(session, 404);
1262                 return;
1263         }
1264
1265         g_free(session->address);
1266         session->address = g_strdup(results[0]);
1267
1268         handle_resolved_address(session);
1269 }
1270
1271 static bool is_ip_address(const char *host)
1272 {
1273         struct addrinfo hints;
1274         struct addrinfo *addr;
1275         int result;
1276
1277         memset(&hints, 0, sizeof(struct addrinfo));
1278         hints.ai_flags = AI_NUMERICHOST;
1279         addr = NULL;
1280
1281         result = getaddrinfo(host, NULL, &hints, &addr);
1282         freeaddrinfo(addr);
1283
1284         return result == 0;
1285 }
1286
1287 static guint do_request(GWeb *web, const char *url,
1288                                 const char *type, GWebInputFunc input,
1289                                 int fd, gsize length, GWebResultFunc func,
1290                                 GWebRouteFunc route, gpointer user_data)
1291 {
1292         struct web_session *session;
1293         const gchar *host;
1294
1295         if (!web || !url)
1296                 return 0;
1297
1298         debug(web, "request %s", url);
1299
1300         session = g_try_new0(struct web_session, 1);
1301         if (!session)
1302                 return 0;
1303
1304         if (parse_url(session, url, web->proxy) < 0) {
1305                 free_session(session);
1306                 return 0;
1307         }
1308
1309         debug(web, "proxy host %s", session->address);
1310         debug(web, "port %u", session->port);
1311         debug(web, "host %s", session->host);
1312         debug(web, "flags %lu", session->flags);
1313         debug(web, "request %s", session->request);
1314
1315         if (type) {
1316                 session->content_type = g_strdup(type);
1317
1318                 debug(web, "content-type %s", session->content_type);
1319         }
1320
1321         session->web = web;
1322
1323         session->result_func = func;
1324         session->route_func = route;
1325         session->input_func = input;
1326         session->fd = fd;
1327         session->length = length;
1328         session->offset = 0;
1329         session->user_data = user_data;
1330
1331         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
1332         if (!session->receive_buffer) {
1333                 free_session(session);
1334                 return 0;
1335         }
1336
1337         session->result.headers = g_hash_table_new_full(g_str_hash, g_str_equal,
1338                                                         g_free, g_free);
1339         if (!session->result.headers) {
1340                 free_session(session);
1341                 return 0;
1342         }
1343
1344         session->receive_space = DEFAULT_BUFFER_SIZE;
1345         session->send_buffer = g_string_sized_new(0);
1346         session->current_header = g_string_sized_new(0);
1347         session->header_done = false;
1348         session->body_done = false;
1349
1350         host = session->address ? session->address : session->host;
1351         if (is_ip_address(host)) {
1352                 if (session->address != host) {
1353                         g_free(session->address);
1354                         session->address = g_strdup(host);
1355                 }
1356                 session->address_action = g_timeout_add(0, already_resolved,
1357                                                         session);
1358         } else {
1359                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
1360                                         host, resolv_result, session);
1361                 if (session->resolv_action == 0) {
1362                         free_session(session);
1363                         return 0;
1364                 }
1365         }
1366
1367         web->session_list = g_list_append(web->session_list, session);
1368
1369         return web->next_query_id++;
1370 }
1371
1372 guint g_web_request_get(GWeb *web, const char *url, GWebResultFunc func,
1373                 GWebRouteFunc route, gpointer user_data)
1374 {
1375         return do_request(web, url, NULL, NULL, -1, 0, func, route, user_data);
1376 }
1377
1378 guint g_web_request_post(GWeb *web, const char *url,
1379                                 const char *type, GWebInputFunc input,
1380                                 GWebResultFunc func, gpointer user_data)
1381 {
1382         return do_request(web, url, type, input, -1, 0, func, NULL, user_data);
1383 }
1384
1385 guint g_web_request_post_file(GWeb *web, const char *url,
1386                                 const char *type, const char *file,
1387                                 GWebResultFunc func, gpointer user_data)
1388 {
1389         struct stat st;
1390         int fd;
1391         guint ret;
1392
1393         if (stat(file, &st) < 0)
1394                 return 0;
1395
1396         fd = open(file, O_RDONLY);
1397         if (fd < 0)
1398                 return 0;
1399
1400         ret = do_request(web, url, type, NULL, fd, st.st_size, func, NULL,
1401                         user_data);
1402         if (ret == 0)
1403                 close(fd);
1404
1405         return ret;
1406 }
1407
1408 bool g_web_cancel_request(GWeb *web, guint id)
1409 {
1410         if (!web)
1411                 return false;
1412
1413         return true;
1414 }
1415
1416 guint16 g_web_result_get_status(GWebResult *result)
1417 {
1418         if (!result)
1419                 return 0;
1420
1421         return result->status;
1422 }
1423
1424 bool g_web_result_get_chunk(GWebResult *result,
1425                                 const guint8 **chunk, gsize *length)
1426 {
1427         if (!result)
1428                 return false;
1429
1430         if (!chunk)
1431                 return false;
1432
1433         *chunk = result->buffer;
1434
1435         if (length)
1436                 *length = result->length;
1437
1438         return true;
1439 }
1440
1441 bool g_web_result_get_header(GWebResult *result,
1442                                 const char *header, const char **value)
1443 {
1444         if (!result)
1445                 return false;
1446
1447         if (!value)
1448                 return false;
1449
1450         *value = g_hash_table_lookup(result->headers, header);
1451
1452         if (!*value)
1453                 return false;
1454
1455         return true;
1456 }
1457
1458 struct _GWebParser {
1459         gint ref_count;
1460         char *begin_token;
1461         char *end_token;
1462         const char *token_str;
1463         size_t token_len;
1464         size_t token_pos;
1465         bool intoken;
1466         GString *content;
1467         GWebParserFunc func;
1468         gpointer user_data;
1469 };
1470
1471 GWebParser *g_web_parser_new(const char *begin, const char *end,
1472                                 GWebParserFunc func, gpointer user_data)
1473 {
1474         GWebParser *parser;
1475
1476         parser = g_try_new0(GWebParser, 1);
1477         if (!parser)
1478                 return NULL;
1479
1480         parser->ref_count = 1;
1481
1482         parser->begin_token = g_strdup(begin);
1483         parser->end_token = g_strdup(end);
1484
1485         if (!parser->begin_token) {
1486                 g_free(parser);
1487                 return NULL;
1488         }
1489
1490         parser->func = func;
1491         parser->user_data = user_data;
1492
1493         parser->token_str = parser->begin_token;
1494         parser->token_len = strlen(parser->token_str);
1495         parser->token_pos = 0;
1496
1497         parser->intoken = false;
1498         parser->content = g_string_sized_new(0);
1499
1500         return parser;
1501 }
1502
1503 GWebParser *g_web_parser_ref(GWebParser *parser)
1504 {
1505         if (!parser)
1506                 return NULL;
1507
1508         __sync_fetch_and_add(&parser->ref_count, 1);
1509
1510         return parser;
1511 }
1512
1513 void g_web_parser_unref(GWebParser *parser)
1514 {
1515         if (!parser)
1516                 return;
1517
1518         if (__sync_fetch_and_sub(&parser->ref_count, 1) != 1)
1519                 return;
1520
1521         g_string_free(parser->content, TRUE);
1522
1523         g_free(parser->begin_token);
1524         g_free(parser->end_token);
1525         g_free(parser);
1526 }
1527
1528 void g_web_parser_feed_data(GWebParser *parser,
1529                                 const guint8 *data, gsize length)
1530 {
1531         const guint8 *ptr = data;
1532
1533         if (!parser)
1534                 return;
1535
1536         while (length > 0) {
1537                 guint8 chr = parser->token_str[parser->token_pos];
1538
1539                 if (parser->token_pos == 0) {
1540                         guint8 *pos;
1541
1542                         pos = memchr(ptr, chr, length);
1543                         if (!pos) {
1544                                 if (parser->intoken)
1545                                         g_string_append_len(parser->content,
1546                                                         (gchar *) ptr, length);
1547                                 break;
1548                         }
1549
1550                         if (parser->intoken)
1551                                 g_string_append_len(parser->content,
1552                                                 (gchar *) ptr, (pos - ptr) + 1);
1553
1554                         length -= (pos - ptr) + 1;
1555                         ptr = pos + 1;
1556
1557                         parser->token_pos++;
1558                         continue;
1559                 }
1560
1561                 if (parser->intoken)
1562                         g_string_append_c(parser->content, ptr[0]);
1563
1564                 if (ptr[0] != chr) {
1565                         length--;
1566                         ptr++;
1567
1568                         parser->token_pos = 0;
1569                         continue;
1570                 }
1571
1572                 length--;
1573                 ptr++;
1574
1575                 parser->token_pos++;
1576
1577                 if (parser->token_pos == parser->token_len) {
1578                         if (!parser->intoken) {
1579                                 g_string_append(parser->content,
1580                                                         parser->token_str);
1581
1582                                 parser->intoken = true;
1583                                 parser->token_str = parser->end_token;
1584                                 parser->token_len = strlen(parser->end_token);
1585                                 parser->token_pos = 0;
1586                         } else {
1587                                 char *str;
1588                                 str = g_string_free(parser->content, FALSE);
1589                                 parser->content = g_string_sized_new(0);
1590                                 if (parser->func)
1591                                         parser->func(str, parser->user_data);
1592                                 g_free(str);
1593
1594                                 parser->intoken = false;
1595                                 parser->token_str = parser->begin_token;
1596                                 parser->token_len = strlen(parser->begin_token);
1597                                 parser->token_pos = 0;
1598                         }
1599                 }
1600         }
1601 }
1602
1603 void g_web_parser_end_data(GWebParser *parser)
1604 {
1605         if (!parser)
1606                 return;
1607 }