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
 438         if (session->result_func == NULL)
 439                 return;
 440
 441         if (status != 0)
 442                 session->result.status = status;
 443
 444         session->result_func(&session->result, session->user_data);
 445
 446 }
 447
 448 static inline void call_route_func(struct web_session *session)
 449 {
 450         if (session->route_func != NULL)
 451                 session->route_func(session->address, session->addr->ai_family,
 452                                 session->web->index, session->user_data);
 453 }
 454
 455 static gboolean process_send_buffer(struct web_session *session)
 456 {
 457         GString *buf;
 458         gsize count, bytes_written;
 459         GIOStatus status;
 460
 461         if (session == NULL)
 462                 return FALSE;
 463
 464         buf = session->send_buffer;
 465         count = buf->len;
 466
 467         if (count == 0) {
 468                 if (session->request_started == TRUE &&
 469                                         session->more_data == FALSE &&
 470                                         session->fd == -1)
 471                         session->body_done = TRUE;
 472
 473                 return FALSE;
 474         }
 475
 476         status = g_io_channel_write_chars(session->transport_channel,
 477                                         buf->str, count, &bytes_written, NULL);
 478
 479         debug(session->web, "status %u bytes to write %zu bytes written %zu",
 480                                         status, count, bytes_written);
 481
 482         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN)
 483                 return FALSE;
 484
 485         g_string_erase(buf, 0, bytes_written);
 486
 487         return TRUE;
 488 }
 489
 490 static gboolean process_send_file(struct web_session *session)
 491 {
 492         int sk;
 493         off_t offset;
 494         ssize_t bytes_sent;
 495
 496         if (session->fd == -1)
 497                 return FALSE;
 498
 499         if (session->request_started == FALSE || session->more_data == TRUE)
 500                 return FALSE;
 501
 502         sk = g_io_channel_unix_get_fd(session->transport_channel);
 503         if (sk < 0)
 504                 return FALSE;
 505
 506         offset = session->offset;
 507
 508         bytes_sent = sendfile(sk, session->fd, &offset, session->length);
 509
 510         debug(session->web, "errno: %d, bytes to send %zu / bytes sent %zu",
 511                         errno, session->length, bytes_sent);
 512
 513         if (bytes_sent < 0 && errno != EAGAIN)
 514                 return FALSE;
 515
 516         session->offset = offset;
 517         session->length -= bytes_sent;
 518
 519         if (session->length == 0) {
 520                 session->body_done = TRUE;
 521                 return FALSE;
 522         }
 523
 524         return TRUE;
 525 }
 526
 527 static void process_next_chunk(struct web_session *session)
 528 {
 529         GString *buf = session->send_buffer;
 530         const guint8 *body;
 531         gsize length;
 532
 533         if (session->input_func == NULL) {
 534                 session->more_data = FALSE;
 535                 return;
 536         }
 537
 538         session->more_data = session->input_func(&body, &length,
 539                                                 session->user_data);
 540
 541         if (length > 0) {
 542                 g_string_append_printf(buf, "%zx\r\n", length);
 543                 g_string_append_len(buf, (char *) body, length);
 544                 g_string_append(buf, "\r\n");
 545         }
 546
 547         if (session->more_data == FALSE)
 548                 g_string_append(buf, "0\r\n\r\n");
 549 }
 550
 551 static void start_request(struct web_session *session)
 552 {
 553         GString *buf = session->send_buffer;
 554         const char *version;
 555         const guint8 *body;
 556         gsize length;
 557
 558         debug(session->web, "request %s from %s",
 559                                         session->request, session->host);
 560
 561         g_string_truncate(buf, 0);
 562
 563         if (session->web->http_version == NULL)
 564                 version = "1.1";
 565         else
 566                 version = session->web->http_version;
 567
 568         if (session->content_type == NULL)
 569                 g_string_append_printf(buf, "GET %s HTTP/%s\r\n",
 570                                                 session->request, version);
 571         else
 572                 g_string_append_printf(buf, "POST %s HTTP/%s\r\n",
 573                                                 session->request, version);
 574
 575         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 576
 577         if (session->web->user_agent != NULL)
 578                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 579                                                 session->web->user_agent);
 580
 581         if (session->web->user_agent_profile != NULL) {
 582                 g_string_append_printf(buf, "x-wap-profile: %s\r\n",
 583                                        session->web->user_agent_profile);
 584         }
 585
 586         if (session->web->accept_option != NULL)
 587                 g_string_append_printf(buf, "Accept: %s\r\n",
 588                                                 session->web->accept_option);
 589
 590         if (session->content_type != NULL) {
 591                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 592                                                         session->content_type);
 593                 if (session->input_func == NULL) {
 594                         session->more_data = FALSE;
 595                         length = session->length;
 596                 } else
 597                         session->more_data = session->input_func(&body, &length,
 598                                                         session->user_data);
 599                 if (session->more_data == FALSE)
 600                         g_string_append_printf(buf, "Content-Length: %zu\r\n",
 601                                                                         length);
 602                 else
 603                         g_string_append(buf, "Transfer-Encoding: chunked\r\n");
 604         }
 605
 606         if (session->web->close_connection == TRUE)
 607                 g_string_append(buf, "Connection: close\r\n");
 608
 609         g_string_append(buf, "\r\n");
 610
 611         if (session->content_type != NULL && length > 0) {
 612                 if (session->more_data == TRUE) {
 613                         g_string_append_printf(buf, "%zx\r\n", length);
 614                         g_string_append_len(buf, (char *) body, length);
 615                         g_string_append(buf, "\r\n");
 616                 } else if (session->fd == -1)
 617                         g_string_append_len(buf, (char *) body, length);
 618         }
 619 }
 620
 621 static gboolean send_data(GIOChannel *channel, GIOCondition cond,
 622                                                 gpointer user_data)
 623 {
 624         struct web_session *session = user_data;
 625
 626         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 627                 session->send_watch = 0;
 628                 return FALSE;
 629         }
 630
 631         if (process_send_buffer(session) == TRUE)
 632                 return TRUE;
 633
 634         if (process_send_file(session) == TRUE)
 635                 return TRUE;
 636
 637         if (session->request_started == FALSE) {
 638                 session->request_started = TRUE;
 639                 start_request(session);
 640         } else if (session->more_data == TRUE)
 641                 process_next_chunk(session);
 642
 643         process_send_buffer(session);
 644
 645         if (session->body_done == TRUE) {
 646                 session->send_watch = 0;
 647                 return FALSE;
 648         }
 649
 650         return TRUE;
 651 }
 652
 653 static int decode_chunked(struct web_session *session,
 654                                         const guint8 *buf, gsize len)
 655 {
 656         const guint8 *ptr = buf;
 657         gsize counter;
 658
 659         while (len > 0) {
 660                 guint8 *pos;
 661                 gsize count;
 662                 char *str;
 663
 664                 switch (session->chunck_state) {
 665                 case CHUNK_SIZE:
 666                         pos = memchr(ptr, '\n', len);
 667                         if (pos == NULL) {
 668                                 g_string_append_len(session->current_header,
 669                                                 (gchar *) ptr, len);
 670                                 return 0;
 671                         }
 672
 673                         count = pos - ptr;
 674                         if (count < 1 || ptr[count - 1] != '\r')
 675                                 return -EILSEQ;
 676
 677                         g_string_append_len(session->current_header,
 678                                                 (gchar *) ptr, count);
 679
 680                         len -= count + 1;
 681                         ptr = pos + 1;
 682
 683                         str = session->current_header->str;
 684
 685                         counter = strtoul(str, NULL, 16);
 686                         if ((counter == 0 && errno == EINVAL) ||
 687                                                 counter == ULONG_MAX)
 688                                 return -EILSEQ;
 689
 690                         session->chunk_size = counter;
 691                         session->chunk_left = counter;
 692
 693                         session->chunck_state = CHUNK_DATA;
 694                         break;
 695                 case CHUNK_R_BODY:
 696                         if (*ptr != '\r')
 697                                 return -EILSEQ;
 698                         ptr++;
 699                         len--;
 700                         session->chunck_state = CHUNK_N_BODY;
 701                         break;
 702                 case CHUNK_N_BODY:
 703                         if (*ptr != '\n')
 704                                 return -EILSEQ;
 705                         ptr++;
 706                         len--;
 707                         session->chunck_state = CHUNK_SIZE;
 708                         break;
 709                 case CHUNK_DATA:
 710                         if (session->chunk_size == 0) {
 711                                 debug(session->web, "Download Done in chunk");
 712                                 g_string_truncate(session->current_header, 0);
 713                                 return 0;
 714                         }
 715
 716                         if (session->chunk_left <= len) {
 717                                 session->result.buffer = ptr;
 718                                 session->result.length = session->chunk_left;
 719                                 call_result_func(session, 0);
 720
 721                                 len -= session->chunk_left;
 722                                 ptr += session->chunk_left;
 723
 724                                 session->total_len += session->chunk_left;
 725                                 session->chunk_left = 0;
 726
 727                                 g_string_truncate(session->current_header, 0);
 728                                 session->chunck_state = CHUNK_R_BODY;
 729                                 break;
 730                         }
 731                         /* more data */
 732                         session->result.buffer = ptr;
 733                         session->result.length = len;
 734                         call_result_func(session, 0);
 735
 736                         session->chunk_left -= len;
 737                         session->total_len += len;
 738
 739                         len -= len;
 740                         ptr += len;
 741                         break;
 742                 }
 743         }
 744
 745         return 0;
 746 }
 747
 748 static int handle_body(struct web_session *session,
 749                                 const guint8 *buf, gsize len)
 750 {
 751         int err;
 752
 753         debug(session->web, "[body] length %zu", len);
 754
 755         if (session->result.use_chunk == FALSE) {
 756                 if (len > 0) {
 757                         session->result.buffer = buf;
 758                         session->result.length = len;
 759                         call_result_func(session, 0);
 760                 }
 761                 return 0;
 762         }
 763
 764         err = decode_chunked(session, buf, len);
 765         if (err < 0) {
 766                 debug(session->web, "Error in chunk decode %d", err);
 767
 768                 session->result.buffer = NULL;
 769                 session->result.length = 0;
 770                 call_result_func(session, 400);
 771         }
 772
 773         return err;
 774 }
 775
 776 static void handle_multi_line(struct web_session *session)
 777 {
 778         gsize count;
 779         char *str;
 780         gchar *value;
 781
 782         str = session->current_header->str;
 783
 784         if (str[0] != ' ' && str[0] != '\t')
 785                 return;
 786
 787         while (str[0] == ' ' || str[0] == '\t')
 788                 str++;
 789
 790         count = str - session->current_header->str;
 791         if (count > 0) {
 792                 g_string_erase(session->current_header, 0, count);
 793                 g_string_insert_c(session->current_header, 0, ' ');
 794         }
 795
 796         value = g_hash_table_lookup(session->result.headers,
 797                                         session->result.last_key);
 798         if (value != NULL) {
 799                 g_string_insert(session->current_header, 0, value);
 800
 801                 str = session->current_header->str;
 802
 803                 g_hash_table_replace(session->result.headers,
 804                                         g_strdup(session->result.last_key),
 805                                         g_strdup(str));
 806         }
 807 }
 808
 809 static void add_header_field(struct web_session *session)
 810 {
 811         gsize count;
 812         guint8 *pos;
 813         char *str;
 814         gchar *value;
 815         gchar *key;
 816
 817         str = session->current_header->str;
 818
 819         pos = memchr(str, ':', session->current_header->len);
 820         if (pos != NULL) {
 821                 *pos = '\0';
 822                 pos++;
 823
 824                 key = g_strdup(str);
 825
 826                 /* remove preceding white spaces */
 827                 while (*pos == ' ')
 828                         pos++;
 829
 830                 count = (char *) pos - str;
 831
 832                 g_string_erase(session->current_header, 0, count);
 833
 834                 value = g_hash_table_lookup(session->result.headers, key);
 835                 if (value != NULL) {
 836                         g_string_insert_c(session->current_header, 0, ' ');
 837                         g_string_insert_c(session->current_header, 0, ';');
 838
 839                         g_string_insert(session->current_header, 0, value);
 840                 }
 841
 842                 str = session->current_header->str;
 843                 g_hash_table_replace(session->result.headers, key,
 844                                                         g_strdup(str));
 845
 846                 g_free(session->result.last_key);
 847                 session->result.last_key = g_strdup(key);
 848         }
 849 }
 850
 851 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 852                                                         gpointer user_data)
 853 {
 854         struct web_session *session = user_data;
 855         guint8 *ptr = session->receive_buffer;
 856         gsize bytes_read;
 857         GIOStatus status;
 858
 859         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 860                 session->transport_watch = 0;
 861                 session->result.buffer = NULL;
 862                 session->result.length = 0;
 863                 call_result_func(session, 400);
 864                 return FALSE;
 865         }
 866
 867         status = g_io_channel_read_chars(channel,
 868                                 (gchar *) session->receive_buffer,
 869                                 session->receive_space - 1, &bytes_read, NULL);
 870
 871         debug(session->web, "bytes read %zu", bytes_read);
 872
 873         if (status != G_IO_STATUS_NORMAL && status != G_IO_STATUS_AGAIN) {
 874                 session->transport_watch = 0;
 875                 session->result.buffer = NULL;
 876                 session->result.length = 0;
 877                 call_result_func(session, 0);
 878                 return FALSE;
 879         }
 880
 881         session->receive_buffer[bytes_read] = '\0';
 882
 883         if (session->header_done == TRUE) {
 884                 if (handle_body(session, session->receive_buffer,
 885                                                         bytes_read) < 0) {
 886                         session->transport_watch = 0;
 887                         return FALSE;
 888                 }
 889                 return TRUE;
 890         }
 891
 892         while (bytes_read > 0) {
 893                 guint8 *pos;
 894                 gsize count;
 895                 char *str;
 896
 897                 pos = memchr(ptr, '\n', bytes_read);
 898                 if (pos == NULL) {
 899                         g_string_append_len(session->current_header,
 900                                                 (gchar *) ptr, bytes_read);
 901                         return TRUE;
 902                 }
 903
 904                 *pos = '\0';
 905                 count = strlen((char *) ptr);
 906                 if (count > 0 && ptr[count - 1] == '\r') {
 907                         ptr[--count] = '\0';
 908                         bytes_read--;
 909                 }
 910
 911                 g_string_append_len(session->current_header,
 912                                                 (gchar *) ptr, count);
 913
 914                 bytes_read -= count + 1;
 915                 if (bytes_read > 0)
 916                         ptr = pos + 1;
 917                 else
 918                         ptr = NULL;
 919
 920                 if (session->current_header->len == 0) {
 921                         char *val;
 922
 923                         session->header_done = TRUE;
 924
 925                         val = g_hash_table_lookup(session->result.headers,
 926                                                         "Transfer-Encoding");
 927                         if (val != NULL) {
 928                                 val = g_strrstr(val, "chunked");
 929                                 if (val != NULL) {
 930                                         session->result.use_chunk = TRUE;
 931
 932                                         session->chunck_state = CHUNK_SIZE;
 933                                         session->chunk_left = 0;
 934                                         session->total_len = 0;
 935                                 }
 936                         }
 937
 938                         if (handle_body(session, ptr, bytes_read) < 0) {
 939                                 session->transport_watch = 0;
 940                                 return FALSE;
 941                         }
 942                         break;
 943                 }
 944
 945                 str = session->current_header->str;
 946
 947                 if (session->result.status == 0) {
 948                         unsigned int code;
 949
 950                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 951                                 session->result.status = code;
 952                 }
 953
 954                 debug(session->web, "[header] %s", str);
 955
 956                 /* handle multi-line header */
 957                 if (str[0] == ' ' || str[0] == '\t')
 958                         handle_multi_line(session);
 959                 else
 960                         add_header_field(session);
 961
 962                 g_string_truncate(session->current_header, 0);
 963         }
 964
 965         return TRUE;
 966 }
 967
 968 static int bind_to_address(int sk, const char *interface, int family)
 969 {
 970         struct ifaddrs *ifaddr_list, *ifaddr;
 971         int size, err = -1;
 972
 973         if (getifaddrs(&ifaddr_list) < 0)
 974                 return err;
 975
 976         for (ifaddr = ifaddr_list; ifaddr != NULL; ifaddr = ifaddr->ifa_next) {
 977                 if (g_strcmp0(ifaddr->ifa_name, interface) != 0)
 978                         continue;
 979
 980                 if (ifaddr->ifa_addr == NULL ||
 981                                 ifaddr->ifa_addr->sa_family != family)
 982                         continue;
 983
 984                 switch (family) {
 985                 case AF_INET:
 986                         size = sizeof(struct sockaddr_in);
 987                         break;
 988                 case AF_INET6:
 989                         size = sizeof(struct sockaddr_in6);
 990                         break;
 991                 default:
 992                         continue;
 993                 }
 994
 995                 err = bind(sk, (struct sockaddr *) ifaddr->ifa_addr, size);
 996                 break;
 997         }
 998
 999         freeifaddrs(ifaddr_list);
1000         return err;
1001 }
1002
1003 static inline int bind_socket(int sk, int index, int family)
1004 {
1005         char interface[IF_NAMESIZE];
1006         int err;
1007
1008         if (if_indextoname(index, interface) == NULL)
1009                 return -1;
1010
1011         err = setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1012                                         interface, IF_NAMESIZE);
1013         if (err < 0)
1014                 err = bind_to_address(sk, interface, family);
1015
1016         return err;
1017 }
1018
1019 static int connect_session_transport(struct web_session *session)
1020 {
1021         GIOFlags flags;
1022         int sk;
1023
1024         sk = socket(session->addr->ai_family, SOCK_STREAM | SOCK_CLOEXEC,
1025                         IPPROTO_TCP);
1026         if (sk < 0)
1027                 return -EIO;
1028
1029         if (session->web->index > 0) {
1030                 if (bind_socket(sk, session->web->index,
1031                                         session->addr->ai_family) < 0) {
1032                         debug(session->web, "bind() %s", strerror(errno));
1033                         close(sk);
1034                         return -EIO;
1035                 }
1036         }
1037
1038         if (session->flags & SESSION_FLAG_USE_TLS) {
1039                 debug(session->web, "using TLS encryption");
1040                 session->transport_channel = g_io_channel_gnutls_new(sk);
1041         } else {
1042                 debug(session->web, "no encryption");
1043                 session->transport_channel = g_io_channel_unix_new(sk);
1044         }
1045
1046         if (session->transport_channel == NULL) {
1047                 debug(session->web, "channel missing");
1048                 close(sk);
1049                 return -ENOMEM;
1050         }
1051
1052         flags = g_io_channel_get_flags(session->transport_channel);
1053         g_io_channel_set_flags(session->transport_channel,
1054                                         flags | G_IO_FLAG_NONBLOCK, NULL);
1055
1056         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
1057         g_io_channel_set_buffered(session->transport_channel, FALSE);
1058
1059         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
1060
1061         if (connect(sk, session->addr->ai_addr,
1062                         session->addr->ai_addrlen) < 0) {
1063                 if (errno != EINPROGRESS) {
1064                         debug(session->web, "connect() %s", strerror(errno));
1065                         close(sk);
1066                         return -EIO;
1067                 }
1068         }
1069
1070         session->transport_watch = g_io_add_watch(session->transport_channel,
1071                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
1072                                                 received_data, session);
1073
1074         session->send_watch = g_io_add_watch(session->transport_channel,
1075                                 G_IO_OUT | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
1076                                                 send_data, session);
1077
1078         return 0;
1079 }
1080
1081 static int create_transport(struct web_session *session)
1082 {
1083         int err;
1084
1085         err = connect_session_transport(session);
1086         if (err < 0)
1087                 return err;
1088
1089         debug(session->web, "creating session %s:%u",
1090                                         session->address, session->port);
1091
1092         return 0;
1093 }
1094
1095 static int parse_url(struct web_session *session,
1096                                 const char *url, const char *proxy)
1097 {
1098         char *scheme, *host, *port, *path;
1099
1100         scheme = g_strdup(url);
1101         if (scheme == NULL)
1102                 return -EINVAL;
1103
1104         host = strstr(scheme, "://");
1105         if (host != NULL) {
1106                 *host = '\0';
1107                 host += 3;
1108
1109                 if (strcasecmp(scheme, "https") == 0) {
1110                         session->port = 443;
1111                         session->flags |= SESSION_FLAG_USE_TLS;
1112                 } else if (strcasecmp(scheme, "http") == 0) {
1113                         session->port = 80;
1114                 } else {
1115                         g_free(scheme);
1116                         return -EINVAL;
1117                 }
1118         } else {
1119                 host = scheme;
1120                 session->port = 80;
1121         }
1122
1123         path = strchr(host, '/');
1124         if (path != NULL)
1125                 *(path++) = '\0';
1126
1127         if (proxy == NULL)
1128                 session->request = g_strdup_printf("/%s", path ? path : "");
1129         else
1130                 session->request = g_strdup(url);
1131
1132         port = strrchr(host, ':');
1133         if (port != NULL) {
1134                 char *end;
1135                 int tmp = strtol(port + 1, &end, 10);
1136
1137                 if (*end == '\0') {
1138                         *port = '\0';
1139                         session->port = tmp;
1140                 }
1141
1142                 if (proxy == NULL)
1143                         session->host = g_strdup(host);
1144                 else
1145                         session->host = g_strdup_printf("%s:%u", host, tmp);
1146         } else
1147                 session->host = g_strdup(host);
1148
1149         g_free(scheme);
1150
1151         if (proxy == NULL)
1152                 return 0;
1153
1154         scheme = g_strdup(proxy);
1155         if (scheme == NULL)
1156                 return -EINVAL;
1157
1158         host = strstr(proxy, "://");
1159         if (host != NULL) {
1160                 *host = '\0';
1161                 host += 3;
1162
1163                 if (strcasecmp(scheme, "http") != 0) {
1164                         g_free(scheme);
1165                         return -EINVAL;
1166                 }
1167         } else
1168                 host = scheme;
1169
1170         path = strchr(host, '/');
1171         if (path != NULL)
1172                 *(path++) = '\0';
1173
1174         port = strrchr(host, ':');
1175         if (port != NULL) {
1176                 char *end;
1177                 int tmp = strtol(port + 1, &end, 10);
1178
1179                 if (*end == '\0') {
1180                         *port = '\0';
1181                         session->port = tmp;
1182                 }
1183         }
1184
1185         session->address = g_strdup(host);
1186
1187         g_free(scheme);
1188
1189         return 0;
1190 }
1191
1192 static void resolv_result(GResolvResultStatus status,
1193                                         char **results, gpointer user_data)
1194 {
1195         struct web_session *session = user_data;
1196         struct addrinfo hints;
1197         char *port;
1198         int ret;
1199
1200         if (results == NULL || results[0] == NULL) {
1201                 call_result_func(session, 404);
1202                 return;
1203         }
1204
1205         debug(session->web, "address %s", results[0]);
1206
1207         memset(&hints, 0, sizeof(struct addrinfo));
1208         hints.ai_flags = AI_NUMERICHOST;
1209         hints.ai_family = session->web->family;
1210
1211         if (session->addr != NULL) {
1212                 freeaddrinfo(session->addr);
1213                 session->addr = NULL;
1214         }
1215
1216         port = g_strdup_printf("%u", session->port);
1217         ret = getaddrinfo(results[0], port, &hints, &session->addr);
1218         g_free(port);
1219         if (ret != 0 || session->addr == NULL) {
1220                 call_result_func(session, 400);
1221                 return;
1222         }
1223
1224         session->address = g_strdup(results[0]);
1225         call_route_func(session);
1226
1227         if (create_transport(session) < 0) {
1228                 call_result_func(session, 409);
1229                 return;
1230         }
1231 }
1232
1233 static guint do_request(GWeb *web, const char *url,
1234                                 const char *type, GWebInputFunc input,
1235                                 int fd, gsize length, GWebResultFunc func,
1236                                 GWebRouteFunc route, gpointer user_data)
1237 {
1238         struct web_session *session;
1239
1240         if (web == NULL || url == NULL)
1241                 return 0;
1242
1243         debug(web, "request %s", url);
1244
1245         session = g_try_new0(struct web_session, 1);
1246         if (session == NULL)
1247                 return 0;
1248
1249         if (parse_url(session, url, web->proxy) < 0) {
1250                 free_session(session);
1251                 return 0;
1252         }
1253
1254         debug(web, "address %s", session->address);
1255         debug(web, "port %u", session->port);
1256         debug(web, "host %s", session->host);
1257         debug(web, "flags %lu", session->flags);
1258         debug(web, "request %s", session->request);
1259
1260         if (type != NULL) {
1261                 session->content_type = g_strdup(type);
1262
1263                 debug(web, "content-type %s", session->content_type);
1264         }
1265
1266         session->web = web;
1267
1268         session->result_func = func;
1269         session->route_func = route;
1270         session->input_func = input;
1271         session->fd = fd;
1272         session->length = length;
1273         session->offset = 0;
1274         session->user_data = user_data;
1275
1276         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
1277         if (session->receive_buffer == NULL) {
1278                 free_session(session);
1279                 return 0;
1280         }
1281
1282         session->result.headers = g_hash_table_new_full(g_str_hash, g_str_equal,
1283                                                         g_free, g_free);
1284         if (session->result.headers == NULL) {
1285                 free_session(session);
1286                 return 0;
1287         }
1288
1289         session->receive_space = DEFAULT_BUFFER_SIZE;
1290         session->send_buffer = g_string_sized_new(0);
1291         session->current_header = g_string_sized_new(0);
1292         session->header_done = FALSE;
1293         session->body_done = FALSE;
1294
1295         if (session->address == NULL && inet_aton(session->host, NULL) == 0) {
1296                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
1297                                         session->host, resolv_result, session);
1298                 if (session->resolv_action == 0) {
1299                         free_session(session);
1300                         return 0;
1301                 }
1302         } else {
1303                 struct addrinfo hints;
1304                 char *port;
1305                 int ret;
1306
1307                 if (session->address == NULL)
1308                         session->address = g_strdup(session->host);
1309
1310                 memset(&hints, 0, sizeof(struct addrinfo));
1311                 hints.ai_flags = AI_NUMERICHOST;
1312                 hints.ai_family = session->web->family;
1313
1314                 if (session->addr != NULL) {
1315                         freeaddrinfo(session->addr);
1316                         session->addr = NULL;
1317                 }
1318
1319                 port = g_strdup_printf("%u", session->port);
1320                 ret = getaddrinfo(session->address, port, &hints,
1321                                                         &session->addr);
1322                 g_free(port);
1323                 if (ret != 0 || session->addr == NULL) {
1324                         free_session(session);
1325                         return 0;
1326                 }
1327
1328                 if (create_transport(session) < 0) {
1329                         free_session(session);
1330                         return 0;
1331                 }
1332         }
1333
1334         web->session_list = g_list_append(web->session_list, session);
1335
1336         return web->next_query_id++;
1337 }
1338
1339 guint g_web_request_get(GWeb *web, const char *url, GWebResultFunc func,
1340                 GWebRouteFunc route, gpointer user_data)
1341 {
1342         return do_request(web, url, NULL, NULL, -1, 0, func, route, user_data);
1343 }
1344
1345 guint g_web_request_post(GWeb *web, const char *url,
1346                                 const char *type, GWebInputFunc input,
1347                                 GWebResultFunc func, gpointer user_data)
1348 {
1349         return do_request(web, url, type, input, -1, 0, func, NULL, user_data);
1350 }
1351
1352 guint g_web_request_post_file(GWeb *web, const char *url,
1353                                 const char *type, const char *file,
1354                                 GWebResultFunc func, gpointer user_data)
1355 {
1356         struct stat st;
1357         int fd;
1358         guint ret;
1359
1360         if (stat(file, &st) < 0)
1361                 return 0;
1362
1363         fd = open(file, O_RDONLY);
1364         if (fd < 0)
1365                 return 0;
1366
1367         ret = do_request(web, url, type, NULL, fd, st.st_size, func, NULL,
1368                         user_data);
1369         if (ret == 0)
1370                 close(fd);
1371
1372         return ret;
1373 }
1374
1375 gboolean g_web_cancel_request(GWeb *web, guint id)
1376 {
1377         if (web == NULL)
1378                 return FALSE;
1379
1380         return TRUE;
1381 }
1382
1383 guint16 g_web_result_get_status(GWebResult *result)
1384 {
1385         if (result == NULL)
1386                 return 0;
1387
1388         return result->status;
1389 }
1390
1391 gboolean g_web_result_get_chunk(GWebResult *result,
1392                                 const guint8 **chunk, gsize *length)
1393 {
1394         if (result == NULL)
1395                 return FALSE;
1396
1397         if (chunk == NULL)
1398                 return FALSE;
1399
1400         *chunk = result->buffer;
1401
1402         if (length != NULL)
1403                 *length = result->length;
1404
1405         return TRUE;
1406 }
1407
1408 gboolean g_web_result_get_header(GWebResult *result,
1409                                 const char *header, const char **value)
1410 {
1411         if (result == NULL)
1412                 return FALSE;
1413
1414         if (value == NULL)
1415                 return FALSE;
1416
1417         *value = g_hash_table_lookup(result->headers, header);
1418
1419         if (*value == NULL)
1420                 return FALSE;
1421
1422         return TRUE;
1423 }
1424
1425 struct _GWebParser {
1426         gint ref_count;
1427         char *begin_token;
1428         char *end_token;
1429         const char *token_str;
1430         size_t token_len;
1431         size_t token_pos;
1432         gboolean intoken;
1433         GString *content;
1434         GWebParserFunc func;
1435         gpointer user_data;
1436 };
1437
1438 GWebParser *g_web_parser_new(const char *begin, const char *end,
1439                                 GWebParserFunc func, gpointer user_data)
1440 {
1441         GWebParser *parser;
1442
1443         parser = g_try_new0(GWebParser, 1);
1444         if (parser == NULL)
1445                 return NULL;
1446
1447         parser->ref_count = 1;
1448
1449         parser->begin_token = g_strdup(begin);
1450         parser->end_token = g_strdup(end);
1451
1452         if (parser->begin_token == NULL) {
1453                 g_free(parser);
1454                 return NULL;
1455         }
1456
1457         parser->func = func;
1458         parser->user_data = user_data;
1459
1460         parser->token_str = parser->begin_token;
1461         parser->token_len = strlen(parser->token_str);
1462         parser->token_pos = 0;
1463
1464         parser->intoken = FALSE;
1465         parser->content = g_string_sized_new(0);
1466
1467         return parser;
1468 }
1469
1470 GWebParser *g_web_parser_ref(GWebParser *parser)
1471 {
1472         if (parser == NULL)
1473                 return NULL;
1474
1475         __sync_fetch_and_add(&parser->ref_count, 1);
1476
1477         return parser;
1478 }
1479
1480 void g_web_parser_unref(GWebParser *parser)
1481 {
1482         if (parser == NULL)
1483                 return;
1484
1485         if (__sync_fetch_and_sub(&parser->ref_count, 1) != 1)
1486                 return;
1487
1488         g_string_free(parser->content, TRUE);
1489
1490         g_free(parser->begin_token);
1491         g_free(parser->end_token);
1492         g_free(parser);
1493 }
1494
1495 void g_web_parser_feed_data(GWebParser *parser,
1496                                 const guint8 *data, gsize length)
1497 {
1498         const guint8 *ptr = data;
1499
1500         if (parser == NULL)
1501                 return;
1502
1503         while (length > 0) {
1504                 guint8 chr = parser->token_str[parser->token_pos];
1505
1506                 if (parser->token_pos == 0) {
1507                         guint8 *pos;
1508
1509                         pos = memchr(ptr, chr, length);
1510                         if (pos == NULL) {
1511                                 if (parser->intoken == TRUE)
1512                                         g_string_append_len(parser->content,
1513                                                         (gchar *) ptr, length);
1514                                 break;
1515                         }
1516
1517                         if (parser->intoken == TRUE)
1518                                 g_string_append_len(parser->content,
1519                                                 (gchar *) ptr, (pos - ptr) + 1);
1520
1521                         length -= (pos - ptr) + 1;
1522                         ptr = pos + 1;
1523
1524                         parser->token_pos++;
1525                         continue;
1526                 }
1527
1528                 if (parser->intoken == TRUE)
1529                         g_string_append_c(parser->content, ptr[0]);
1530
1531                 if (ptr[0] != chr) {
1532                         length--;
1533                         ptr++;
1534
1535                         parser->token_pos = 0;
1536                         continue;
1537                 }
1538
1539                 length--;
1540                 ptr++;
1541
1542                 parser->token_pos++;
1543
1544                 if (parser->token_pos == parser->token_len) {
1545                         if (parser->intoken == FALSE) {
1546                                 g_string_append(parser->content,
1547                                                         parser->token_str);
1548
1549                                 parser->intoken = TRUE;
1550                                 parser->token_str = parser->end_token;
1551                                 parser->token_len = strlen(parser->end_token);
1552                                 parser->token_pos = 0;
1553                         } else {
1554                                 char *str;
1555                                 str = g_string_free(parser->content, FALSE);
1556                                 parser->content = g_string_sized_new(0);
1557                                 if (parser->func)
1558                                         parser->func(str, parser->user_data);
1559                                 g_free(str);
1560
1561                                 parser->intoken = FALSE;
1562                                 parser->token_str = parser->begin_token;
1563                                 parser->token_len = strlen(parser->begin_token);
1564                                 parser->token_pos = 0;
1565                         }
1566                 }
1567         }
1568 }
1569
1570 void g_web_parser_end_data(GWebParser *parser)
1571 {
1572         if (parser == NULL)
1573                 return;
1574 }