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