gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2012  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         gboolean 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         char *request;
  83
  84         guint8 *receive_buffer;
  85         gsize receive_space;
  86         GString *send_buffer;
  87         GString *current_header;
  88         gboolean header_done;
  89         gboolean body_done;
  90         gboolean more_data;
  91         gboolean request_started;
  92
  93         enum chunk_state chunck_state;
  94         gsize chunk_size;
  95         gsize chunk_left;
  96         gsize total_len;
  97
  98         GWebResult result;
  99
 100         GWebResultFunc result_func;
 101         GWebRouteFunc route_func;
 102         GWebInputFunc input_func;
 103         int fd;
 104         gsize length;
 105         gsize offset;
 106         gpointer user_data;
 107 };
 108
 109 struct _GWeb {
 110         int ref_count;
 111
 112         guint next_query_id;
 113
 114         int family;
 115
 116         int index;
 117         GList *session_list;
 118
 119         GResolv *resolv;
 120         char *proxy;
 121         char *accept_option;
 122         char *user_agent;
 123         char *user_agent_profile;
 124         char *http_version;
 125         gboolean close_connection;
 126
 127         GWebDebugFunc debug_func;
 128         gpointer debug_data;
 129 };
 130
 131 static inline void debug(GWeb *web, const char *format, ...)
 132 {
 133         char str[256];
 134         va_list ap;
 135
 136         if (web->debug_func == NULL)
 137                 return;
 138
 139         va_start(ap, format);
 140
 141         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 142                 web->debug_func(str, web->debug_data);
 143
 144         va_end(ap);
 145 }
 146
 147 static void free_session(struct web_session *session)
 148 {
 149         GWeb *web;
 150
 151         if (session == NULL)
 152                 return;
 153
 154         g_free(session->request);
 155
 156         web = session->web;
 157         if (session->resolv_action > 0)
 158                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 159
 160         if (session->transport_watch > 0)
 161                 g_source_remove(session->transport_watch);
 162
 163         if (session->send_watch > 0)
 164                 g_source_remove(session->send_watch);
 165
 166         if (session->transport_channel != NULL)
 167                 g_io_channel_unref(session->transport_channel);
 168
 169         g_free(session->result.last_key);
 170
 171         if (session->result.headers != NULL)
 172                 g_hash_table_destroy(session->result.headers);
 173
 174         if (session->send_buffer != NULL)
 175                 g_string_free(session->send_buffer, TRUE);
 176
 177         if (session->current_header != NULL)
 178                 g_string_free(session->current_header, TRUE);
 179
 180         g_free(session->receive_buffer);
 181
 182         g_free(session->content_type);
 183
 184         g_free(session->host);
 185         g_free(session->address);
 186         if (session->addr != NULL)
 187                 freeaddrinfo(session->addr);
 188
 189         g_free(session);
 190 }
 191
 192 static void flush_sessions(GWeb *web)
 193 {
 194         GList *list;
 195
 196         for (list = g_list_first(web->session_list);
 197                                         list; list = g_list_next(list))
 198                 free_session(list->data);
 199
 200         g_list_free(web->session_list);
 201         web->session_list = NULL;
 202 }
 203
 204 GWeb *g_web_new(int index)
 205 {
 206         GWeb *web;
 207
 208         if (index < 0)
 209                 return NULL;
 210
 211         web = g_try_new0(GWeb, 1);
 212         if (web == NULL)
 213                 return NULL;
 214
 215         web->ref_count = 1;
 216
 217         web->next_query_id = 1;
 218
 219         web->family = AF_UNSPEC;
 220
 221         web->index = index;
 222         web->session_list = NULL;
 223
 224         web->resolv = g_resolv_new(index);
 225         if (web->resolv == NULL) {
 226                 g_free(web);
 227                 return NULL;
 228         }
 229
 230         web->accept_option = g_strdup("*/*");
 231         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 232         web->close_connection = FALSE;
 233
 234         return web;
 235 }
 236
 237 GWeb *g_web_ref(GWeb *web)
 238 {
 239         if (web == NULL)
 240                 return NULL;
 241
 242         __sync_fetch_and_add(&web->ref_count, 1);
 243
 244         return web;
 245 }
 246
 247 void g_web_unref(GWeb *web)
 248 {
 249         if (web == NULL)
 250                 return;
 251
 252         if (__sync_fetch_and_sub(&web->ref_count, 1) != 1)
 253                 return;
 254
 255         flush_sessions(web);
 256
 257         g_resolv_unref(web->resolv);
 258
 259         g_free(web->proxy);
 260
 261         g_free(web->accept_option);
 262         g_free(web->user_agent);
 263         g_free(web->user_agent_profile);
 264         g_free(web->http_version);
 265
 266         g_free(web);
 267 }
 268
 269 gboolean g_web_supports_tls(void)
 270 {
 271         return g_io_channel_supports_tls();
 272 }
 273
 274 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 275 {
 276         if (web == NULL)
 277                 return;
 278
 279         web->debug_func = func;
 280         web->debug_data = user_data;
 281
 282         g_resolv_set_debug(web->resolv, func, user_data);
 283 }
 284
 285 gboolean g_web_set_proxy(GWeb *web, const char *proxy)
 286 {
 287         if (web == NULL)
 288                 return FALSE;
 289
 290         g_free(web->proxy);
 291
 292         if (proxy == NULL) {
 293                 web->proxy = NULL;
 294                 debug(web, "clearing proxy");
 295         } else {
 296                 web->proxy = g_strdup(proxy);
 297                 debug(web, "setting proxy %s", web->proxy);
 298         }
 299
 300         return TRUE;
 301 }
 302
 303 gboolean g_web_set_address_family(GWeb *web, int family)
 304 {
 305         if (web == NULL)
 306                 return FALSE;
 307
 308         if (family != AF_UNSPEC && family != AF_INET && family != AF_INET6)
 309                 return FALSE;
 310
 311         web->family = family;
 312
 313         g_resolv_set_address_family(web->resolv, family);
 314
 315         return TRUE;
 316 }
 317
 318 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 319 {
 320         if (web == NULL)
 321                 return FALSE;
 322
 323         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 324
 325         return TRUE;
 326 }
 327
 328 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 329 {
 330         g_free(web->accept_option);
 331
 332         if (format == NULL) {
 333                 web->accept_option = NULL;
 334                 debug(web, "clearing accept option");
 335         } else {
 336                 web->accept_option = g_strdup_vprintf(format, args);
 337                 debug(web, "setting accept %s", web->accept_option);
 338         }
 339
 340         return TRUE;
 341 }
 342
 343 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 344 {
 345         va_list args;
 346         gboolean result;
 347
 348         if (web == NULL)
 349                 return FALSE;
 350
 351         va_start(args, format);
 352         result = set_accept_option(web, format, args);
 353         va_end(args);
 354
 355         return result;
 356 }
 357
 358 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 359 {
 360         g_free(web->user_agent);
 361
 362         if (format == NULL) {
 363                 web->user_agent = NULL;
 364                 debug(web, "clearing user agent");
 365         } else {
 366                 web->user_agent = g_strdup_vprintf(format, args);
 367                 debug(web, "setting user agent %s", web->user_agent);
 368         }
 369
 370         return TRUE;
 371 }
 372
 373 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 374 {
 375         va_list args;
 376         gboolean result;
 377
 378         if (web == NULL)
 379                 return FALSE;
 380
 381         va_start(args, format);
 382         result = set_user_agent(web, format, args);
 383         va_end(args);
 384
 385         return result;
 386 }
 387
 388 gboolean g_web_set_ua_profile(GWeb *web, const char *profile)
 389 {
 390         if (web == NULL)
 391                 return FALSE;
 392
 393         g_free(web->user_agent_profile);
 394
 395         web->user_agent_profile = g_strdup(profile);
 396         debug(web, "setting user agent profile %s", web->user_agent);
 397
 398         return TRUE;
 399 }
 400
 401 gboolean g_web_set_http_version(GWeb *web, const char *version)
 402 {
 403         if (web == NULL)
 404                 return FALSE;
 405
 406         g_free(web->http_version);
 407
 408         if (version == NULL) {
 409                 web->http_version = NULL;
 410                 debug(web, "clearing HTTP version");
 411         } else {
 412                 web->http_version = g_strdup(version);
 413                 debug(web, "setting HTTP version %s", web->http_version);
 414         }
 415
 416         return TRUE;
 417 }
 418
 419 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 420 {
 421         if (web == NULL)
 422                 return;
 423
 424         web->close_connection = enabled;
 425 }
 426
 427 gboolean g_web_get_close_connection(GWeb *web)
 428 {
 429         if (web == NULL)
 430                 return FALSE;
 431
 432         return web->close_connection;
 433 }
 434
 435 static inline void call_result_func(struct web_session *session, guint16 status)
 436 {
 437         gboolean result;
 438
 439         if (session->result_func == NULL)
 440                 return;
 441
 442         if (status != 0)
 443                 session->result.status = status;
 444
 445         result = session->result_func(&session->result, session->user_data);
 446
 447         debug(session->web, "[result function] %s",
 448                                         result == TRUE ? "continue" : "stop");
 449 }
 450
 451 static inline void call_route_func(struct web_session *session)
 452 {
 453         if (session->route_func != NULL)
 454                 session->route_func(session->address, session->addr->ai_family,
 455                                 session->web->index, session->user_data);
 456 }
 457
 458 static gboolean process_send_buffer(struct web_session *session)
 459 {
 460         GString *buf;
 461         gsize count, bytes_written;
 462         GIOStatus status;
 463
 464         if (session == NULL)
 465                 return FALSE;
 466
 467         buf = session->send_buffer;
 468         count = buf->len;
 469
 470         if (count == 0) {
 471                 if (session->request_started == TRUE &&
 472                                         session->more_data == FALSE &&
 473                                         session->fd == -1)
 474                         session->body_done = TRUE;
 475
 476                 return FALSE;
 477         }
 478
 479         status = g_io_channel_write_chars(session->transport_channel,
 480                                         buf->str, count, &bytes_written, NULL);
 481
 482         debug(session->web, "status %u bytes to write %zu bytes written %zu",
 483                                         status, count, bytes_written);
 484
 485         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 486                 return FALSE;
 487
 488         g_string_erase(buf, 0, bytes_written);
 489
 490         return TRUE;
 491 }
 492
 493 static gboolean process_send_file(struct web_session *session)
 494 {
 495         int sk;
 496         off_t offset;
 497         ssize_t bytes_sent;
 498
 499         if (session->fd == -1)
 500                 return FALSE;
 501
 502         if (session->request_started == FALSE || session->more_data == TRUE)
 503                 return FALSE;
 504
 505         sk = g_io_channel_unix_get_fd(session->transport_channel);
 506         if (sk < 0)
 507                 return FALSE;
 508
 509         offset = session->offset;
 510
 511         bytes_sent = sendfile(sk, session->fd, &offset, session->length);
 512
 513         debug(session->web, "errno: %d, bytes to send %zu / bytes sent %zu",
 514                         errno, session->length, bytes_sent);
 515
 516         if (bytes_sent < 0 && errno != EAGAIN)
 517                 return FALSE;
 518
 519         session->offset = offset;
 520         session->length -= bytes_sent;
 521
 522         if (session->length == 0) {
 523                 session->body_done = TRUE;
 524                 return FALSE;
 525         }
 526
 527         return TRUE;
 528 }
 529
 530 static void process_next_chunk(struct web_session *session)
 531 {
 532         GString *buf = session->send_buffer;
 533         const guint8 *body;
 534         gsize length;
 535
 536         if (session->input_func == NULL) {
 537                 session->more_data = FALSE;
 538                 return;
 539         }
 540
 541         session->more_data = session->input_func(&body, &length,
 542                                                 session->user_data);
 543
 544         if (length > 0) {
 545                 g_string_append_printf(buf, "%zx\r\n", length);
 546                 g_string_append_len(buf, (char *) body, length);
 547                 g_string_append(buf, "\r\n");
 548         }
 549
 550         if (session->more_data == FALSE)
 551                 g_string_append(buf, "0\r\n\r\n");
 552 }
 553
 554 static void start_request(struct web_session *session)
 555 {
 556         GString *buf = session->send_buffer;
 557         const char *version;
 558         const guint8 *body;
 559         gsize length;
 560
 561         debug(session->web, "request %s from %s",
 562                                         session->request, session->host);
 563
 564         g_string_truncate(buf, 0);
 565
 566         if (session->web->http_version == NULL)
 567                 version = "1.1";
 568         else
 569                 version = session->web->http_version;
 570
 571         if (session->content_type == NULL)
 572                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 573                                                 session->request, version);
 574         else
 575                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 576                                                 session->request, version);
 577
 578         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 579
 580         if (session->web->user_agent != NULL)
 581                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 582                                                 session->web->user_agent);
 583
 584         if (session->web->user_agent_profile != NULL) {
 585                 g_string_append_printf(buf, "x-wap-profile: %s\r\n",
 586                                        session->web->user_agent_profile);
 587         }
 588
 589         if (session->web->accept_option != NULL)
 590                 g_string_append_printf(buf, "Accept: %s\r\n",
 591                                                 session->web->accept_option);
 592
 593         if (session->content_type != NULL) {
 594                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 595                                                         session->content_type);
 596                 if (session->input_func == NULL) {
 597                         session->more_data = FALSE;
 598                         length = session->length;
 599                 } else
 600                         session->more_data = session->input_func(&body, &length,
 601                                                         session->user_data);
 602                 if (session->more_data == FALSE)
 603                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 604                                                                         length);
 605                 else
 606                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 607         }
 608
 609         if (session->web->close_connection == TRUE)
 610                 g_string_append(buf, "Connection: close\r\n");
 611
 612         g_string_append(buf, "\r\n");
 613
 614         if (session->content_type != NULL && length > 0) {
 615                 if (session->more_data == TRUE) {
 616                         g_string_append_printf(buf, "%zx\r\n", length);
 617                         g_string_append_len(buf, (char *) body, length);
 618                         g_string_append(buf, "\r\n");
 619                 } else if (session->fd == -1)
 620                         g_string_append_len(buf, (char *) body, length);
 621         }
 622 }
 623
 624 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 625                                                 gpointer user_data)
 626 {
 627         struct web_session *session = user_data;
 628
 629         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 630                 session->send_watch = 0;
 631                 return FALSE;
 632         }
 633
 634         if (process_send_buffer(session) == TRUE)
 635                 return TRUE;
 636
 637         if (process_send_file(session) == TRUE)
 638                 return TRUE;
 639
 640         if (session->request_started == FALSE) {
 641                 session->request_started = TRUE;
 642                 start_request(session);
 643         } else if (session->more_data == TRUE)
 644                 process_next_chunk(session);
 645
 646         process_send_buffer(session);
 647
 648         if (session->body_done == TRUE) {
 649                 session->send_watch = 0;
 650                 return FALSE;
 651         }
 652
 653         return TRUE;
 654 }
 655
 656 static int decode_chunked(struct web_session *session,
 657                                         const guint8 *buf, gsize len)
 658 {
 659         const guint8 *ptr = buf;
 660         gsize counter;
 661
 662         while (len > 0) {
 663                 guint8 *pos;
 664                 gsize count;
 665                 char *str;
 666
 667                 switch (session->chunck_state) {
 668                 case CHUNK_SIZE:
 669                         pos = memchr(ptr, '\n', len);
 670                         if (pos == NULL) {
 671                                 g_string_append_len(session->current_header,
 672                                                 (gchar *) ptr, len);
 673                                 return 0;
 674                         }
 675
 676                         count = pos - ptr;
 677                         if (count < 1 || ptr[count - 1] != '\r')
 678                                 return -EILSEQ;
 679
 680                         g_string_append_len(session->current_header,
 681                                                 (gchar *) ptr, count);
 682
 683                         len -= count + 1;
 684                         ptr = pos + 1;
 685
 686                         str = session->current_header->str;
 687
 688                         counter = strtoul(str, NULL, 16);
 689                         if ((counter == 0 && errno == EINVAL) ||
 690                                                 counter == ULONG_MAX)
 691                                 return -EILSEQ;
 692
 693                         session->chunk_size = counter;
 694                         session->chunk_left = counter;
 695
 696                         session->chunck_state = CHUNK_DATA;
 697                         break;
 698                 case CHUNK_R_BODY:
 699                         if (*ptr != '\r')
 700                                 return -EILSEQ;
 701                         ptr++;
 702                         len--;
 703                         session->chunck_state = CHUNK_N_BODY;
 704                         break;
 705                 case CHUNK_N_BODY:
 706                         if (*ptr != '\n')
 707                                 return -EILSEQ;
 708                         ptr++;
 709                         len--;
 710                         session->chunck_state = CHUNK_SIZE;
 711                         break;
 712                 case CHUNK_DATA:
 713                         if (session->chunk_size == 0) {
 714                                 debug(session->web, "Download Done in chunk");
 715                                 g_string_truncate(session->current_header, 0);
 716                                 return 0;
 717                         }
 718
 719                         if (session->chunk_left <= len) {
 720                                 session->result.buffer = ptr;
 721                                 session->result.length = session->chunk_left;
 722                                 call_result_func(session, 0);
 723
 724                                 len -= session->chunk_left;
 725                                 ptr += session->chunk_left;
 726
 727                                 session->total_len += session->chunk_left;
 728                                 session->chunk_left = 0;
 729
 730                                 g_string_truncate(session->current_header, 0);
 731                                 session->chunck_state = CHUNK_R_BODY;
 732                                 break;
 733                         }
 734                         /* more data */
 735                         session->result.buffer = ptr;
 736                         session->result.length = len;
 737                         call_result_func(session, 0);
 738
 739                         session->chunk_left -= len;
 740                         session->total_len += len;
 741
 742                         len -= len;
 743                         ptr += len;
 744                         break;
 745                 }
 746         }
 747
 748         return 0;
 749 }
 750
 751 static int handle_body(struct web_session *session,
 752                                 const guint8 *buf, gsize len)
 753 {
 754         int err;
 755
 756         debug(session->web, "[body] length %zu", len);
 757
 758         if (session->result.use_chunk == FALSE) {
 759                 if (len > 0) {
 760                         session->result.buffer = buf;
 761                         session->result.length = len;
 762                         call_result_func(session, 0);
 763                 }
 764                 return 0;
 765         }
 766
 767         err = decode_chunked(session, buf, len);
 768         if (err < 0) {
 769                 debug(session->web, "Error in chunk decode %d", err);
 770
 771                 session->result.buffer = NULL;
 772                 session->result.length = 0;
 773                 call_result_func(session, 400);
 774         }
 775
 776         return err;
 777 }
 778
 779 static void handle_multi_line(struct web_session *session)
 780 {
 781         gsize count;
 782         char *str;
 783         gchar *value;
 784
 785         str = session->current_header->str;
 786
 787         if (str[0] != ' ' && str[0] != '\t')
 788                 return;
 789
 790         while (str[0] == ' ' || str[0] == '\t')
 791                 str++;
 792
 793         count = str - session->current_header->str;
 794         if (count > 0) {
 795                 g_string_erase(session->current_header, 0, count);
 796                 g_string_insert_c(session->current_header, 0, ' ');
 797         }
 798
 799         value = g_hash_table_lookup(session->result.headers,
 800                                         session->result.last_key);
 801         if (value != NULL) {
 802                 g_string_insert(session->current_header, 0, value);
 803
 804                 str = session->current_header->str;
 805
 806                 g_hash_table_replace(session->result.headers,
 807                                         g_strdup(session->result.last_key),
 808                                         g_strdup(str));
 809         }
 810 }
 811
 812 static void add_header_field(struct web_session *session)
 813 {
 814         gsize count;
 815         guint8 *pos;
 816         char *str;
 817         gchar *value;
 818         gchar *key;
 819
 820         str = session->current_header->str;
 821
 822         pos = memchr(str, ':', session->current_header->len);
 823         if (pos != NULL) {
 824                 *pos = '\0';
 825                 pos++;
 826
 827                 key = g_strdup(str);
 828
 829                 /* remove preceding white spaces */
 830                 while (*pos == ' ')
 831                         pos++;
 832
 833                 count = (char *) pos - str;
 834
 835                 g_string_erase(session->current_header, 0, count);
 836
 837                 value = g_hash_table_lookup(session->result.headers, key);
 838                 if (value != NULL) {
 839                         g_string_insert_c(session->current_header, 0, ' ');
 840                         g_string_insert_c(session->current_header, 0, ';');
 841
 842                         g_string_insert(session->current_header, 0, value);
 843                 }
 844
 845                 str = session->current_header->str;
 846                 g_hash_table_replace(session->result.headers, key,
 847                                                         g_strdup(str));
 848
 849                 g_free(session->result.last_key);
 850                 session->result.last_key = g_strdup(key);
 851         }
 852 }
 853
 854 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 855                                                         gpointer user_data)
 856 {
 857         struct web_session *session = user_data;
 858         guint8 *ptr = session->receive_buffer;
 859         gsize bytes_read;
 860         GIOStatus status;
 861
 862         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 863                 session->transport_watch = 0;
 864                 session->result.buffer = NULL;
 865                 session->result.length = 0;
 866                 call_result_func(session, 400);
 867                 return FALSE;
 868         }
 869
 870         status = g_io_channel_read_chars(channel,
 871                                 (gchar *) session->receive_buffer,
 872                                 session->receive_space - 1, &bytes_read, NULL);
 873
 874         debug(session->web, "bytes read %zu", bytes_read);
 875
 876         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 877                 session->transport_watch = 0;
 878                 session->result.buffer = NULL;
 879                 session->result.length = 0;
 880                 call_result_func(session, 0);
 881                 return FALSE;
 882         }
 883
 884         session->receive_buffer[bytes_read] = '\0';
 885
 886         if (session->header_done == TRUE) {
 887                 if (handle_body(session, session->receive_buffer,
 888                                                         bytes_read) < 0) {
 889                         session->transport_watch = 0;
 890                         return FALSE;
 891                 }
 892                 return TRUE;
 893         }
 894
 895         while (bytes_read > 0) {
 896                 guint8 *pos;
 897                 gsize count;
 898                 char *str;
 899
 900                 pos = memchr(ptr, '\n', bytes_read);
 901                 if (pos == NULL) {
 902                         g_string_append_len(session->current_header,
 903                                                 (gchar *) ptr, bytes_read);
 904                         return TRUE;
 905                 }
 906
 907                 *pos = '\0';
 908                 count = strlen((char *) ptr);
 909                 if (count > 0 && ptr[count - 1] == '\r') {
 910                         ptr[--count] = '\0';
 911                         bytes_read--;
 912                 }
 913
 914                 g_string_append_len(session->current_header,
 915                                                 (gchar *) ptr, count);
 916
 917                 bytes_read -= count + 1;
 918                 if (bytes_read > 0)
 919                         ptr = pos + 1;
 920                 else
 921                         ptr = NULL;
 922
 923                 if (session->current_header->len == 0) {
 924                         char *val;
 925
 926                         session->header_done = TRUE;
 927
 928                         val = g_hash_table_lookup(session->result.headers,
 929                                                         "Transfer-Encoding");
 930                         if (val != NULL) {
 931                                 val = g_strrstr(val, "chunked");
 932                                 if (val != NULL) {
 933                                         session->result.use_chunk = TRUE;
 934
 935                                         session->chunck_state = CHUNK_SIZE;
 936                                         session->chunk_left = 0;
 937                                         session->total_len = 0;
 938                                 }
 939                         }
 940
 941                         if (handle_body(session, ptr, bytes_read) < 0) {
 942                                 session->transport_watch = 0;
 943                                 return FALSE;
 944                         }
 945                         break;
 946                 }
 947
 948                 str = session->current_header->str;
 949
 950                 if (session->result.status == 0) {
 951                         unsigned int code;
 952
 953                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 954                                 session->result.status = code;
 955                 }
 956
 957                 debug(session->web, "[header] %s", str);
 958
 959                 /* handle multi-line header */
 960                 if (str[0] == ' ' || str[0] == '\t')
 961                         handle_multi_line(session);
 962                 else
 963                         add_header_field(session);
 964
 965                 g_string_truncate(session->current_header, 0);
 966         }
 967
 968         return TRUE;
 969 }
 970
 971 static int bind_to_address(int sk, const char *interface, int family)
 972 {
 973         struct ifaddrs *ifaddr_list, *ifaddr;
 974         int size, err = -1;
 975
 976         if (getifaddrs(&ifaddr_list) < 0)
 977                 return err;
 978
 979         for (ifaddr = ifaddr_list; ifaddr != NULL; ifaddr = ifaddr->ifa_next) {
 980                 if (g_strcmp0(ifaddr->ifa_name, interface) != 0)
 981                         continue;
 982
 983                 if (ifaddr->ifa_addr == NULL ||
 984                                 ifaddr->ifa_addr->sa_family != family)
 985                         continue;
 986
 987                 switch (family) {
 988                 case AF_INET:
 989                         size = sizeof(struct sockaddr_in);
 990                         break;
 991                 case AF_INET6:
 992                         size = sizeof(struct sockaddr_in6);
 993                         break;
 994                 default:
 995                         continue;
 996                 }
 997
 998                 err = bind(sk, (struct sockaddr *) ifaddr->ifa_addr, size);
 999                 break;
1000         }
1001
1002         freeifaddrs(ifaddr_list);
1003         return err;
1004 }
1005
1006 static inline int bind_socket(int sk, int index, int family)
1007 {
1008         char interface[IF_NAMESIZE];
1009         int err;
1010
1011         if (if_indextoname(index, interface) == NULL)
1012                 return -1;
1013
1014         err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1015                                         interface, IF_NAMESIZE);
1016         if (err < 0)
1017                 err = bind_to_address(sk, interface, family);
1018
1019         return err;
1020 }
1021
1022 static int connect_session_transport(struct web_session *session)
1023 {
1024         GIOFlags flags;
1025         int sk;
1026
1027         sk = socket(session->addr->ai_family, SOCK_STREAM | SOCK_CLOEXEC,
1028                         IPPROTO_TCP);
1029         if (sk < 0)
1030                 return -EIO;
1031
1032         if (session->web->index > 0) {
1033                 if (bind_socket(sk, session->web->index,
1034                                         session->addr->ai_family) < 0) {
1035                         debug(session->web, "bind() %s", strerror(errno));
1036                         close(sk);
1037                         return -EIO;
1038                 }
1039         }
1040
1041         if (session->flags & SESSION_FLAG_USE_TLS) {
1042                 debug(session->web, "using TLS encryption");
1043                 session->transport_channel = g_io_channel_gnutls_new(sk);
1044         } else {
1045                 debug(session->web, "no encryption");
1046                 session->transport_channel = g_io_channel_unix_new(sk);
1047         }
1048
1049         if (session->transport_channel == NULL) {
1050                 debug(session->web, "channel missing");
1051                 close(sk);
1052                 return -ENOMEM;
1053         }
1054
1055         flags = g_io_channel_get_flags(session->transport_channel);
1056         g_io_channel_set_flags(session->transport_channel,
1057                                         flags | G_IO_FLAG_NONBLOCK, NULL);
1058
1059         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
1060         g_io_channel_set_buffered(session->transport_channel, FALSE);
1061
1062         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
1063
1064         if (connect(sk, session->addr->ai_addr,
1065                         session->addr->ai_addrlen) < 0) {
1066                 if (errno != EINPROGRESS) {
1067                         debug(session->web, "connect() %s", strerror(errno));
1068                         close(sk);
1069                         return -EIO;
1070                 }
1071         }
1072
1073         session->transport_watch = g_io_add_watch(session->transport_channel,
1074                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
1075                                                 received_data, session);
1076
1077         session->send_watch = g_io_add_watch(session->transport_channel,
1078                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
1079                                                 send_data, session);
1080
1081         return 0;
1082 }
1083
1084 static int create_transport(struct web_session *session)
1085 {
1086         int err;
1087
1088         err = connect_session_transport(session);
1089         if (err < 0)
1090                 return err;
1091
1092         debug(session->web, "creating session %s:%u",
1093                                         session->address, session->port);
1094
1095         return 0;
1096 }
1097
1098 static int parse_url(struct web_session *session,
1099                                 const char *url, const char *proxy)
1100 {
1101         char *scheme, *host, *port, *path;
1102
1103         scheme = g_strdup(url);
1104         if (scheme == NULL)
1105                 return -EINVAL;
1106
1107         host = strstr(scheme, "://");
1108         if (host != NULL) {
1109                 *host = '\0';
1110                 host += 3;
1111
1112                 if (strcasecmp(scheme, "https") == 0) {
1113                         session->port = 443;
1114                         session->flags |= SESSION_FLAG_USE_TLS;
1115                 } else if (strcasecmp(scheme, "http") == 0) {
1116                         session->port = 80;
1117                 } else {
1118                         g_free(scheme);
1119                         return -EINVAL;
1120                 }
1121         } else {
1122                 host = scheme;
1123                 session->port = 80;
1124         }
1125
1126         path = strchr(host, '/');
1127         if (path != NULL)
1128                 *(path++) = '\0';
1129
1130         if (proxy == NULL)
1131                 session->request = g_strdup_printf("/%s", path ? path : "");
1132         else
1133                 session->request = g_strdup(url);
1134
1135         port = strrchr(host, ':');
1136         if (port != NULL) {
1137                 char *end;
1138                 int tmp = strtol(port + 1, &end, 10);
1139
1140                 if (*end == '\0') {
1141                         *port = '\0';
1142                         session->port = tmp;
1143                 }
1144
1145                 if (proxy == NULL)
1146                         session->host = g_strdup(host);
1147                 else
1148                         session->host = g_strdup_printf("%s:%u", host, tmp);
1149         } else
1150                 session->host = g_strdup(host);
1151
1152         g_free(scheme);
1153
1154         if (proxy == NULL)
1155                 return 0;
1156
1157         scheme = g_strdup(proxy);
1158         if (scheme == NULL)
1159                 return -EINVAL;
1160
1161         host = strstr(proxy, "://");
1162         if (host != NULL) {
1163                 *host = '\0';
1164                 host += 3;
1165
1166                 if (strcasecmp(scheme, "http") != 0) {
1167                         g_free(scheme);
1168                         return -EINVAL;
1169                 }
1170         } else
1171                 host = scheme;
1172
1173         path = strchr(host, '/');
1174         if (path != NULL)
1175                 *(path++) = '\0';
1176
1177         port = strrchr(host, ':');
1178         if (port != NULL) {
1179                 char *end;
1180                 int tmp = strtol(port + 1, &end, 10);
1181
1182                 if (*end == '\0') {
1183                         *port = '\0';
1184                         session->port = tmp;
1185                 }
1186         }
1187
1188         session->address = g_strdup(host);
1189
1190         g_free(scheme);
1191
1192         return 0;
1193 }
1194
1195 static void resolv_result(GResolvResultStatus status,
1196                                         char **results, gpointer user_data)
1197 {
1198         struct web_session *session = user_data;
1199         struct addrinfo hints;
1200         char *port;
1201         int ret;
1202
1203         if (results == NULL || results[0] == NULL) {
1204                 call_result_func(session, 404);
1205                 return;
1206         }
1207
1208         debug(session->web, "address %s", results[0]);
1209
1210         memset(&hints, 0, sizeof(struct addrinfo));
1211         hints.ai_flags = AI_NUMERICHOST;
1212         hints.ai_family = session->web->family;
1213
1214         if (session->addr != NULL) {
1215                 freeaddrinfo(session->addr);
1216                 session->addr = NULL;
1217         }
1218
1219         port = g_strdup_printf("%u", session->port);
1220         ret = getaddrinfo(results[0], port, &hints, &session->addr);
1221         g_free(port);
1222         if (ret != 0 || session->addr == NULL) {
1223                 call_result_func(session, 400);
1224                 return;
1225         }
1226
1227         session->address = g_strdup(results[0]);
1228         call_route_func(session);
1229
1230         if (create_transport(session) < 0) {
1231                 call_result_func(session, 409);
1232                 return;
1233         }
1234 }
1235
1236 static guint do_request(GWeb *web, const char *url,
1237                                 const char *type, GWebInputFunc input,
1238                                 int fd, gsize length, GWebResultFunc func,
1239                                 GWebRouteFunc route, gpointer user_data)
1240 {
1241         struct web_session *session;
1242
1243         if (web == NULL || url == NULL)
1244                 return 0;
1245
1246         debug(web, "request %s", url);
1247
1248         session = g_try_new0(struct web_session, 1);
1249         if (session == NULL)
1250                 return 0;
1251
1252         if (parse_url(session, url, web->proxy) < 0) {
1253                 free_session(session);
1254                 return 0;
1255         }
1256
1257         debug(web, "address %s", session->address);
1258         debug(web, "port %u", session->port);
1259         debug(web, "host %s", session->host);
1260         debug(web, "flags %lu", session->flags);
1261         debug(web, "request %s", session->request);
1262
1263         if (type != NULL) {
1264                 session->content_type = g_strdup(type);
1265
1266                 debug(web, "content-type %s", session->content_type);
1267         }
1268
1269         session->web = web;
1270
1271         session->result_func = func;
1272         session->route_func = route;
1273         session->input_func = input;
1274         session->fd = fd;
1275         session->length = length;
1276         session->offset = 0;
1277         session->user_data = user_data;
1278
1279         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
1280         if (session->receive_buffer == NULL) {
1281                 free_session(session);
1282                 return 0;
1283         }
1284
1285         session->result.headers = g_hash_table_new_full(g_str_hash, g_str_equal,
1286                                                         g_free, g_free);
1287         if (session->result.headers == NULL) {
1288                 free_session(session);
1289                 return 0;
1290         }
1291
1292         session->receive_space = DEFAULT_BUFFER_SIZE;
1293         session->send_buffer = g_string_sized_new(0);
1294         session->current_header = g_string_sized_new(0);
1295         session->header_done = FALSE;
1296         session->body_done = FALSE;
1297
1298         if (session->address == NULL && inet_aton(session->host, NULL) == 0) {
1299                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
1300                                         session->host, resolv_result, session);
1301                 if (session->resolv_action == 0) {
1302                         free_session(session);
1303                         return 0;
1304                 }
1305         } else {
1306                 struct addrinfo hints;
1307                 char *port;
1308                 int ret;
1309
1310                 if (session->address == NULL)
1311                         session->address = g_strdup(session->host);
1312
1313                 memset(&hints, 0, sizeof(struct addrinfo));
1314                 hints.ai_flags = AI_NUMERICHOST;
1315                 hints.ai_family = session->web->family;
1316
1317                 if (session->addr != NULL) {
1318                         freeaddrinfo(session->addr);
1319                         session->addr = NULL;
1320                 }
1321
1322                 port = g_strdup_printf("%u", session->port);
1323                 ret = getaddrinfo(session->address, port, &hints,
1324                                                         &session->addr);
1325                 g_free(port);
1326                 if (ret != 0 || session->addr == NULL) {
1327                         free_session(session);
1328                         return 0;
1329                 }
1330
1331                 if (create_transport(session) < 0) {
1332                         free_session(session);
1333                         return 0;
1334                 }
1335         }
1336
1337         web->session_list = g_list_append(web->session_list, session);
1338
1339         return web->next_query_id++;
1340 }
1341
1342 guint g_web_request_get(GWeb *web, const char *url, GWebResultFunc func,
1343                 GWebRouteFunc route, gpointer user_data)
1344 {
1345         return do_request(web, url, NULL, NULL, -1, 0, func, route, user_data);
1346 }
1347
1348 guint g_web_request_post(GWeb *web, const char *url,
1349                                 const char *type, GWebInputFunc input,
1350                                 GWebResultFunc func, gpointer user_data)
1351 {
1352         return do_request(web, url, type, input, -1, 0, func, NULL, user_data);
1353 }
1354
1355 guint g_web_request_post_file(GWeb *web, const char *url,
1356                                 const char *type, const char *file,
1357                                 GWebResultFunc func, gpointer user_data)
1358 {
1359         struct stat st;
1360         int fd;
1361         guint ret;
1362
1363         if (stat(file, &st) < 0)
1364                 return 0;
1365
1366         fd = open(file, O_RDONLY);
1367         if (fd < 0)
1368                 return 0;
1369
1370         ret = do_request(web, url, type, NULL, fd, st.st_size, func, NULL,
1371                         user_data);
1372         if (ret == 0)
1373                 close(fd);
1374
1375         return ret;
1376 }
1377
1378 gboolean g_web_cancel_request(GWeb *web, guint id)
1379 {
1380         if (web == NULL)
1381                 return FALSE;
1382
1383         return TRUE;
1384 }
1385
1386 guint16 g_web_result_get_status(GWebResult *result)
1387 {
1388         if (result == NULL)
1389                 return 0;
1390
1391         return result->status;
1392 }
1393
1394 gboolean g_web_result_get_chunk(GWebResult *result,
1395                                 const guint8 **chunk, gsize *length)
1396 {
1397         if (result == NULL)
1398                 return FALSE;
1399
1400         if (chunk == NULL)
1401                 return FALSE;
1402
1403         *chunk = result->buffer;
1404
1405         if (length != NULL)
1406                 *length = result->length;
1407
1408         return TRUE;
1409 }
1410
1411 gboolean g_web_result_get_header(GWebResult *result,
1412                                 const char *header, const char **value)
1413 {
1414         if (result == NULL)
1415                 return FALSE;
1416
1417         if (value == NULL)
1418                 return FALSE;
1419
1420         *value = g_hash_table_lookup(result->headers, header);
1421
1422         if (*value == NULL)
1423                 return FALSE;
1424
1425         return TRUE;
1426 }
1427
1428 struct _GWebParser {
1429         gint ref_count;
1430         char *begin_token;
1431         char *end_token;
1432         const char *token_str;
1433         size_t token_len;
1434         size_t token_pos;
1435         gboolean intoken;
1436         GString *content;
1437         GWebParserFunc func;
1438         gpointer user_data;
1439 };
1440
1441 GWebParser *g_web_parser_new(const char *begin, const char *end,
1442                                 GWebParserFunc func, gpointer user_data)
1443 {
1444         GWebParser *parser;
1445
1446         parser = g_try_new0(GWebParser, 1);
1447         if (parser == NULL)
1448                 return NULL;
1449
1450         parser->ref_count = 1;
1451
1452         parser->begin_token = g_strdup(begin);
1453         parser->end_token = g_strdup(end);
1454
1455         if (parser->begin_token == NULL) {
1456                 g_free(parser);
1457                 return NULL;
1458         }
1459
1460         parser->func = func;
1461         parser->user_data = user_data;
1462
1463         parser->token_str = parser->begin_token;
1464         parser->token_len = strlen(parser->token_str);
1465         parser->token_pos = 0;
1466
1467         parser->intoken = FALSE;
1468         parser->content = g_string_sized_new(0);
1469
1470         return parser;
1471 }
1472
1473 GWebParser *g_web_parser_ref(GWebParser *parser)
1474 {
1475         if (parser == NULL)
1476                 return NULL;
1477
1478         __sync_fetch_and_add(&parser->ref_count, 1);
1479
1480         return parser;
1481 }
1482
1483 void g_web_parser_unref(GWebParser *parser)
1484 {
1485         if (parser == NULL)
1486                 return;
1487
1488         if (__sync_fetch_and_sub(&parser->ref_count, 1) != 1)
1489                 return;
1490
1491         g_string_free(parser->content, TRUE);
1492
1493         g_free(parser->begin_token);
1494         g_free(parser->end_token);
1495         g_free(parser);
1496 }
1497
1498 void g_web_parser_feed_data(GWebParser *parser,
1499                                 const guint8 *data, gsize length)
1500 {
1501         const guint8 *ptr = data;
1502
1503         if (parser == NULL)
1504                 return;
1505
1506         while (length > 0) {
1507                 guint8 chr = parser->token_str[parser->token_pos];
1508
1509                 if (parser->token_pos == 0) {
1510                         guint8 *pos;
1511
1512                         pos = memchr(ptr, chr, length);
1513                         if (pos == NULL) {
1514                                 if (parser->intoken == TRUE)
1515                                         g_string_append_len(parser->content,
1516                                                         (gchar *) ptr, length);
1517                                 break;
1518                         }
1519
1520                         if (parser->intoken == TRUE)
1521                                 g_string_append_len(parser->content,
1522                                                 (gchar *) ptr, (pos - ptr) + 1);
1523
1524                         length -= (pos - ptr) + 1;
1525                         ptr = pos + 1;
1526
1527                         parser->token_pos++;
1528                         continue;
1529                 }
1530
1531                 if (parser->intoken == TRUE)
1532                         g_string_append_c(parser->content, ptr[0]);
1533
1534                 if (ptr[0] != chr) {
1535                         length--;
1536                         ptr++;
1537
1538                         parser->token_pos = 0;
1539                         continue;
1540                 }
1541
1542                 length--;
1543                 ptr++;
1544
1545                 parser->token_pos++;
1546
1547                 if (parser->token_pos == parser->token_len) {
1548                         if (parser->intoken == FALSE) {
1549                                 g_string_append(parser->content,
1550                                                         parser->token_str);
1551
1552                                 parser->intoken = TRUE;
1553                                 parser->token_str = parser->end_token;
1554                                 parser->token_len = strlen(parser->end_token);
1555                                 parser->token_pos = 0;
1556                         } else {
1557                                 char *str;
1558                                 str = g_string_free(parser->content, FALSE);
1559                                 parser->content = g_string_sized_new(0);
1560                                 if (parser->func)
1561                                         parser->func(str, parser->user_data);
1562                                 g_free(str);
1563
1564                                 parser->intoken = FALSE;
1565                                 parser->token_str = parser->begin_token;
1566                                 parser->token_len = strlen(parser->begin_token);
1567                                 parser->token_pos = 0;
1568                         }
1569                 }
1570         }
1571 }
1572
1573 void g_web_parser_end_data(GWebParser *parser)
1574 {
1575         if (parser == NULL)
1576                 return;
1577 }