gweb/gweb.c

   1 /*
   2  *
   3  *  Web service library with GLib integration
   4  *
   5  *  Copyright (C) 2009-2010  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <sys/socket.h>
  33 #include <arpa/inet.h>
  34
  35 #include "giognutls.h"
  36 #include "gresolv.h"
  37 #include "gweb.h"
  38
  39 #define DEFAULT_BUFFER_SIZE  2048
  40
  41 #define SESSION_FLAG_USE_TLS    (1 << 0)
  42
  43 struct _GWebResult {
  44         guint16 status;
  45         const guint8 *buffer;
  46         gsize length;
  47 };
  48
  49 struct web_session {
  50         GWeb *web;
  51
  52         char *address;
  53         char *host;
  54         uint16_t port;
  55         unsigned long flags;
  56
  57         char *content_type;
  58         gsize content_length;
  59
  60         GIOChannel *transport_channel;
  61         guint transport_watch;
  62
  63         guint resolv_action;
  64         char *request;
  65
  66         guint8 *receive_buffer;
  67         gsize receive_space;
  68         GString *current_header;
  69         gboolean header_done;
  70
  71         GWebResult result;
  72
  73         GWebResultFunc result_func;
  74         gpointer result_data;
  75 };
  76
  77 struct _GWeb {
  78         gint ref_count;
  79
  80         guint next_query_id;
  81
  82         int index;
  83         GList *session_list;
  84
  85         GResolv *resolv;
  86         char *accept_option;
  87         char *user_agent;
  88         gboolean close_connection;
  89
  90         GWebDebugFunc debug_func;
  91         gpointer debug_data;
  92 };
  93
  94 static inline void debug(GWeb *web, const char *format, ...)
  95 {
  96         char str[256];
  97         va_list ap;
  98
  99         if (web->debug_func == NULL)
 100                 return;
 101
 102         va_start(ap, format);
 103
 104         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 105                 web->debug_func(str, web->debug_data);
 106
 107         va_end(ap);
 108 }
 109
 110 static void free_session(struct web_session *session)
 111 {
 112         GWeb *web = session->web;
 113
 114         if (session == NULL)
 115                 return;
 116
 117         g_free(session->request);
 118
 119         if (session->resolv_action > 0)
 120                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 121
 122         if (session->transport_watch > 0)
 123                 g_source_remove(session->transport_watch);
 124
 125         if (session->transport_channel != NULL)
 126                 g_io_channel_unref(session->transport_channel);
 127
 128         g_string_free(session->current_header, TRUE);
 129         g_free(session->receive_buffer);
 130
 131         g_free(session->content_type);
 132
 133         g_free(session->host);
 134         g_free(session->address);
 135         g_free(session);
 136 }
 137
 138 static void flush_sessions(GWeb *web)
 139 {
 140         GList *list;
 141
 142         for (list = g_list_first(web->session_list);
 143                                         list; list = g_list_next(list))
 144                 free_session(list->data);
 145
 146         g_list_free(web->session_list);
 147         web->session_list = NULL;
 148 }
 149
 150 GWeb *g_web_new(int index)
 151 {
 152         GWeb *web;
 153
 154         if (index < 0)
 155                 return NULL;
 156
 157         web = g_try_new0(GWeb, 1);
 158         if (web == NULL)
 159                 return NULL;
 160
 161         web->ref_count = 1;
 162
 163         web->next_query_id = 1;
 164
 165         web->index = index;
 166         web->session_list = NULL;
 167
 168         web->resolv = g_resolv_new(index);
 169         if (web->resolv == NULL) {
 170                 g_free(web);
 171                 return NULL;
 172         }
 173
 174         web->accept_option = g_strdup("*/*");
 175         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 176         web->close_connection = FALSE;
 177
 178         return web;
 179 }
 180
 181 GWeb *g_web_ref(GWeb *web)
 182 {
 183         if (web == NULL)
 184                 return NULL;
 185
 186         g_atomic_int_inc(&web->ref_count);
 187
 188         return web;
 189 }
 190
 191 void g_web_unref(GWeb *web)
 192 {
 193         if (web == NULL)
 194                 return;
 195
 196         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 197                 return;
 198
 199         flush_sessions(web);
 200
 201         g_resolv_unref(web->resolv);
 202
 203         g_free(web->accept_option);
 204         g_free(web->user_agent);
 205         g_free(web);
 206 }
 207
 208 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 209 {
 210         if (web == NULL)
 211                 return;
 212
 213         web->debug_func = func;
 214         web->debug_data = user_data;
 215
 216         g_resolv_set_debug(web->resolv, func, user_data);
 217 }
 218
 219 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 220 {
 221         if (web == NULL)
 222                 return FALSE;
 223
 224         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 225
 226         return TRUE;
 227 }
 228
 229 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 230 {
 231         g_free(web->accept_option);
 232
 233         if (format == NULL) {
 234                 web->accept_option = NULL;
 235                 debug(web, "clearing accept option");
 236         } else {
 237                 web->accept_option = g_strdup_vprintf(format, args);
 238                 debug(web, "setting accept %s", web->accept_option);
 239         }
 240
 241         return TRUE;
 242 }
 243
 244 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 245 {
 246         va_list args;
 247         gboolean result;
 248
 249         if (web == NULL)
 250                 return FALSE;
 251
 252         va_start(args, format);
 253         result = set_accept_option(web, format, args);
 254         va_end(args);
 255
 256         return result;
 257 }
 258
 259 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 260 {
 261         g_free(web->user_agent);
 262
 263         if (format == NULL) {
 264                 web->user_agent = NULL;
 265                 debug(web, "clearing user agent");
 266         } else {
 267                 web->user_agent = g_strdup_vprintf(format, args);
 268                 debug(web, "setting user agent %s", web->user_agent);
 269         }
 270
 271         return TRUE;
 272 }
 273
 274 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 275 {
 276         va_list args;
 277         gboolean result;
 278
 279         if (web == NULL)
 280                 return FALSE;
 281
 282         va_start(args, format);
 283         result = set_user_agent(web, format, args);
 284         va_end(args);
 285
 286         return result;
 287 }
 288
 289 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 290 {
 291         if (web == NULL)
 292                 return;
 293
 294         web->close_connection = enabled;
 295 }
 296
 297 gboolean g_web_get_close_connection(GWeb *web)
 298 {
 299         if (web == NULL)
 300                 return FALSE;
 301
 302         return web->close_connection;
 303 }
 304
 305 static inline void call_result_func(struct web_session *session, guint16 status)
 306 {
 307         if (session->result_func == NULL)
 308                 return;
 309
 310         if (status != 0)
 311                 session->result.status = status;
 312
 313         session->result_func(&session->result, session->result_data);
 314 }
 315
 316 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 317                                                         gpointer user_data)
 318 {
 319         struct web_session *session = user_data;
 320         guint8 *ptr = session->receive_buffer;
 321         gsize bytes_read;
 322         GIOStatus status;
 323
 324         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 325                 session->transport_watch = 0;
 326                 session->result.buffer = NULL;
 327                 session->result.length = 0;
 328                 call_result_func(session, 400);
 329                 return FALSE;
 330         }
 331
 332         status = g_io_channel_read_chars(channel,
 333                                 (gchar *) session->receive_buffer,
 334                                 session->receive_space - 1, &bytes_read, NULL);
 335
 336         debug(session->web, "bytes read %zu", bytes_read);
 337
 338         if (status != G_IO_STATUS_NORMAL) {
 339                 session->transport_watch = 0;
 340                 session->result.buffer = NULL;
 341                 session->result.length = 0;
 342                 call_result_func(session, 0);
 343                 return FALSE;
 344         }
 345
 346         session->receive_buffer[bytes_read] = '\0';
 347
 348         if (session->header_done == TRUE) {
 349                 session->result.buffer = session->receive_buffer;
 350                 session->result.length = bytes_read;
 351                 call_result_func(session, 0);
 352                 return TRUE;
 353         }
 354
 355         while (bytes_read > 0) {
 356                 guint8 *pos;
 357                 gsize count;
 358                 char *str;
 359
 360                 pos = memchr(ptr, '\n', bytes_read);
 361                 if (pos == NULL) {
 362                         g_string_append_len(session->current_header,
 363                                                 (gchar *) ptr, bytes_read);
 364                         return TRUE;
 365                 }
 366
 367                 *pos = '\0';
 368                 count = strlen((char *) ptr);
 369                 if (count > 0 && ptr[count - 1] == '\r') {
 370                         ptr[--count] = '\0';
 371                         bytes_read--;
 372                 }
 373
 374                 g_string_append_len(session->current_header,
 375                                                 (gchar *) ptr, count);
 376
 377                 bytes_read -= count + 1;
 378                 ptr = pos + 1;
 379
 380                 if (session->current_header->len == 0) {
 381                         session->header_done = TRUE;
 382                         session->result.buffer = pos + 1;
 383                         session->result.length = bytes_read;
 384                         call_result_func(session, 0);
 385                         break;
 386                 }
 387
 388                 str = session->current_header->str;
 389
 390                 if (session->result.status == 0) {
 391                         unsigned int code;
 392
 393                         if (sscanf(str, "HTTP/%*s %u %*s", &code) == 1)
 394                                 session->result.status = code;
 395                 }
 396
 397                 debug(session->web, "[header] %s", str);
 398
 399                 g_string_truncate(session->current_header, 0);
 400         }
 401
 402         return TRUE;
 403 }
 404
 405 static int connect_session_transport(struct web_session *session)
 406 {
 407         struct sockaddr_in sin;
 408         int sk;
 409
 410         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 411         if (sk < 0)
 412                 return -EIO;
 413
 414         memset(&sin, 0, sizeof(sin));
 415         sin.sin_family = AF_INET;
 416         sin.sin_port = htons(session->port);
 417         sin.sin_addr.s_addr = inet_addr(session->address);
 418
 419         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 420                 close(sk);
 421                 return -EIO;
 422         }
 423
 424         if (session->flags & SESSION_FLAG_USE_TLS)
 425                 session->transport_channel = g_io_channel_gnutls_new(sk);
 426         else
 427                 session->transport_channel = g_io_channel_unix_new(sk);
 428
 429         if (session->transport_channel == NULL) {
 430                 close(sk);
 431                 return -ENOMEM;
 432         }
 433
 434         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 435         g_io_channel_set_buffered(session->transport_channel, FALSE);
 436
 437         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 438
 439         session->transport_watch = g_io_add_watch(session->transport_channel,
 440                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 441                                                 received_data, session);
 442
 443         return 0;
 444 }
 445
 446 static int create_transport(struct web_session *session)
 447 {
 448         int err;
 449
 450         err = connect_session_transport(session);
 451         if (err < 0)
 452                 return err;
 453
 454         debug(session->web, "creating session %s:%u",
 455                                         session->address, session->port);
 456
 457         return 0;
 458 }
 459
 460 static void start_request(struct web_session *session)
 461 {
 462         GString *buf;
 463         gchar *str;
 464         gsize count, bytes_written;
 465         GIOStatus status;
 466
 467         debug(session->web, "request %s from %s",
 468                                         session->request, session->host);
 469
 470         buf = g_string_new(NULL);
 471         if (session->content_type == NULL)
 472                 g_string_append_printf(buf, "GET %s HTTP/1.1\r\n",
 473                                                         session->request);
 474         else
 475                 g_string_append_printf(buf, "POST %s HTTP/1.1\r\n",
 476                                                         session->request);
 477         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 478         if (session->web->user_agent != NULL)
 479                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 480                                                 session->web->user_agent);
 481         if (session->web->accept_option != NULL)
 482                 g_string_append_printf(buf, "Accept: %s\r\n",
 483                                                 session->web->accept_option);
 484         if (session->content_type != NULL) {
 485                 g_string_append_printf(buf, "Content-Length: %zu\r\n",
 486                                                 session->content_length);
 487                 g_string_append_printf(buf, "Content-Type: %s\r\n",
 488                                                 session->content_type);
 489         }
 490         if (session->web->close_connection == TRUE)
 491                 g_string_append(buf, "Connection: close\r\n");
 492         g_string_append(buf, "\r\n");
 493         str = g_string_free(buf, FALSE);
 494
 495         count = strlen(str);
 496
 497         debug(session->web, "bytes to write %zu", count);
 498
 499         status = g_io_channel_write_chars(session->transport_channel,
 500                                         str, count, &bytes_written, NULL);
 501
 502         debug(session->web, "status %u bytes written %zu",
 503                                                 status, bytes_written);
 504
 505         //printf("%s", str);
 506
 507         g_free(str);
 508 }
 509
 510 static int parse_url(struct web_session *session, const char *url)
 511 {
 512         char *scheme, *host, *port, *path;
 513
 514         scheme = g_strdup(url);
 515         if (scheme == NULL)
 516                 return -EINVAL;
 517
 518         host = strstr(scheme, "://");
 519         if (host != NULL) {
 520                 *host = '\0';
 521                 host += 3;
 522
 523                 if (strcasecmp(scheme, "https") == 0) {
 524                         session->port = 443;
 525                         session->flags |= SESSION_FLAG_USE_TLS;
 526                 } else if (strcasecmp(scheme, "http") == 0) {
 527                         session->port = 80;
 528                 } else {
 529                         g_free(scheme);
 530                         return -EINVAL;
 531                 }
 532         } else {
 533                 host = scheme;
 534                 session->port = 80;
 535         }
 536
 537         path = strchr(host, '/');
 538         if (path != NULL)
 539                 *(path++) = '\0';
 540
 541         session->request = g_strdup_printf("/%s", path ? path : "");
 542
 543         port = strrchr(host, ':');
 544         if (port != NULL) {
 545                 char *end;
 546                 int tmp = strtol(port + 1, &end, 10);
 547
 548                 if (*end == '\0') {
 549                         *port = '\0';
 550                         session->port = tmp;
 551                 }
 552         }
 553
 554         session->host = g_strdup(host);
 555
 556         g_free(scheme);
 557
 558         return 0;
 559 }
 560
 561 static void resolv_result(GResolvResultStatus status,
 562                                         char **results, gpointer user_data)
 563 {
 564         struct web_session *session = user_data;
 565
 566         if (results == NULL || results[0] == NULL) {
 567                 call_result_func(session, 404);
 568                 return;
 569         }
 570
 571         debug(session->web, "address %s", results[0]);
 572
 573         if (inet_aton(results[0], NULL) == 0) {
 574                 call_result_func(session, 400);
 575                 return;
 576         }
 577
 578         session->address = g_strdup(results[0]);
 579
 580         if (create_transport(session) < 0) {
 581                 call_result_func(session, 409);
 582                 return;
 583         }
 584
 585         start_request(session);
 586 }
 587
 588 static guint do_request(GWeb *web, const char *url,
 589                                 const char *type, guint8 *data, gsize length,
 590                                 GWebResultFunc func, gpointer user_data)
 591 {
 592         struct web_session *session;
 593
 594         if (web == NULL || url == NULL)
 595                 return 0;
 596
 597         debug(web, "request %s", url);
 598
 599         session = g_try_new0(struct web_session, 1);
 600         if (session == NULL)
 601                 return 0;
 602
 603         if (parse_url(session, url) < 0) {
 604                 free_session(session);
 605                 return 0;
 606         }
 607
 608         debug(web, "host %s:%u", session->host, session->port);
 609         debug(web, "flags %lu", session->flags);
 610
 611         if (type != NULL) {
 612                 session->content_type = g_strdup(type);
 613                 session->content_length = length;
 614
 615                 debug(web, "content-type %s", session->content_type);
 616                 debug(web, "content-length %zu", session->content_length);
 617         }
 618
 619         session->web = web;
 620
 621         session->result_func = func;
 622         session->result_data = user_data;
 623
 624         session->receive_buffer = g_try_malloc(DEFAULT_BUFFER_SIZE);
 625         if (session->receive_buffer == NULL) {
 626                 free_session(session);
 627                 return 0;
 628         }
 629
 630         session->receive_space = DEFAULT_BUFFER_SIZE;
 631         session->current_header = g_string_sized_new(0);
 632         session->header_done = FALSE;
 633
 634         if (inet_aton(session->host, NULL) == 0) {
 635                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 636                                         session->host, resolv_result, session);
 637                 if (session->resolv_action == 0) {
 638                         free_session(session);
 639                         return 0;
 640                 }
 641         } else {
 642                 session->address = g_strdup(session->host);
 643
 644                 if (create_transport(session) < 0) {
 645                         free_session(session);
 646                         return 0;
 647                 }
 648
 649                 start_request(session);
 650         }
 651
 652         web->session_list = g_list_append(web->session_list, session);
 653
 654         return web->next_query_id++;
 655 }
 656
 657 guint g_web_request_get(GWeb *web, const char *url,
 658                                 GWebResultFunc func, gpointer user_data)
 659 {
 660         return do_request(web, url, NULL, NULL, 0, func, user_data);
 661 }
 662
 663 guint g_web_request_post(GWeb *web, const char *url,
 664                                 const char *type, guint8 *data, gsize length,
 665                                 GWebResultFunc func, gpointer user_data)
 666 {
 667         return do_request(web, url, type, data, length, func, user_data);
 668 }
 669
 670 gboolean g_web_cancel_request(GWeb *web, guint id)
 671 {
 672         if (web == NULL)
 673                 return FALSE;
 674
 675         return TRUE;
 676 }
 677
 678 guint16 g_web_result_get_status(GWebResult *result)
 679 {
 680         if (result == NULL)
 681                 return 0;
 682
 683         return result->status;
 684 }
 685
 686 gboolean g_web_result_get_chunk(GWebResult *result,
 687                                 const guint8 **chunk, gsize *length)
 688 {
 689         if (result == NULL)
 690                 return FALSE;
 691
 692         if (chunk == NULL)
 693                 return FALSE;
 694
 695         *chunk = result->buffer;
 696
 697         if (length != NULL)
 698                 *length = result->length;
 699
 700         return TRUE;
 701 }
 702
 703 struct _GWebParser {
 704         gint ref_count;
 705         char *begin_token;
 706         char *end_token;
 707         const char *token_str;
 708         size_t token_len;
 709         size_t token_pos;
 710         gboolean intoken;
 711         GString *content;
 712         GWebParserFunc func;
 713         gpointer user_data;
 714 };
 715
 716 GWebParser *g_web_parser_new(const char *begin, const char *end,
 717                                 GWebParserFunc func, gpointer user_data)
 718 {
 719         GWebParser *parser;
 720
 721         parser = g_try_new0(GWebParser, 1);
 722         if (parser == NULL)
 723                 return NULL;
 724
 725         parser->ref_count = 1;
 726
 727         parser->begin_token = g_strdup(begin);
 728         parser->end_token = g_strdup(end);
 729
 730         if (parser->begin_token == NULL) {
 731                 g_free(parser);
 732                 return NULL;
 733         }
 734
 735         parser->func = func;
 736         parser->user_data = user_data;
 737
 738         parser->token_str = parser->begin_token;
 739         parser->token_len = strlen(parser->token_str);
 740         parser->token_pos = 0;
 741
 742         parser->intoken = FALSE;
 743         parser->content = g_string_sized_new(0);
 744
 745         return parser;
 746 }
 747
 748 GWebParser *g_web_parser_ref(GWebParser *parser)
 749 {
 750         if (parser == NULL)
 751                 return NULL;
 752
 753         g_atomic_int_inc(&parser->ref_count);
 754
 755         return parser;
 756 }
 757
 758 void g_web_parser_unref(GWebParser *parser)
 759 {
 760         if (parser == NULL)
 761                 return;
 762
 763         if (g_atomic_int_dec_and_test(&parser->ref_count) == FALSE)
 764                 return;
 765
 766         g_string_free(parser->content, TRUE);
 767
 768         g_free(parser->begin_token);
 769         g_free(parser->end_token);
 770         g_free(parser);
 771 }
 772
 773 void g_web_parser_feed_data(GWebParser *parser,
 774                                 const guint8 *data, gsize length)
 775 {
 776         const guint8 *ptr = data;
 777
 778         if (parser == NULL)
 779                 return;
 780
 781         while (length > 0) {
 782                 guint8 chr = parser->token_str[parser->token_pos];
 783
 784                 if (parser->token_pos == 0) {
 785                         guint8 *pos;
 786
 787                         pos = memchr(ptr, chr, length);
 788                         if (pos == NULL) {
 789                                 if (parser->intoken == TRUE)
 790                                         g_string_append_len(parser->content,
 791                                                         (gchar *) ptr, length);
 792                                 break;
 793                         }
 794
 795                         if (parser->intoken == TRUE)
 796                                 g_string_append_len(parser->content,
 797                                                 (gchar *) ptr, (pos - ptr) + 1);
 798
 799                         length -= (pos - ptr) + 1;
 800                         ptr = pos + 1;
 801
 802                         parser->token_pos++;
 803                         continue;
 804                 }
 805
 806                 if (parser->intoken == TRUE)
 807                         g_string_append_c(parser->content, ptr[0]);
 808
 809                 if (ptr[0] != chr) {
 810                         length--;
 811                         ptr++;
 812
 813                         parser->token_pos = 0;
 814                         continue;
 815                 }
 816
 817                 length--;
 818                 ptr++;
 819
 820                 parser->token_pos++;
 821
 822                 if (parser->token_pos == parser->token_len) {
 823                         if (parser->intoken == FALSE) {
 824                                 g_string_append(parser->content,
 825                                                         parser->token_str);
 826
 827                                 parser->intoken = TRUE;
 828                                 parser->token_str = parser->end_token;
 829                                 parser->token_len = strlen(parser->end_token);
 830                                 parser->token_pos = 0;
 831                         } else {
 832                                 char *str;
 833                                 str = g_string_free(parser->content, FALSE);
 834                                 parser->content = g_string_sized_new(0);
 835                                 if (parser->func)
 836                                         parser->func(str, parser->user_data);
 837                                 g_free(str);
 838
 839                                 parser->intoken = FALSE;
 840                                 parser->token_str = parser->begin_token;
 841                                 parser->token_len = strlen(parser->begin_token);
 842                                 parser->token_pos = 0;
 843                         }
 844                 }
 845         }
 846 }
 847
 848 void g_web_parser_end_data(GWebParser *parser)
 849 {
 850         if (parser == NULL)
 851                 return;
 852 }