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 LINE_CHUNK_SIZE  2048
  40
  41 #define SESSION_FLAG_USE_TLS    (1 << 0)
  42
  43 struct _GWebResult {
  44         const guint8 *buffer;
  45         gsize length;
  46 };
  47
  48 struct web_session {
  49         GWeb *web;
  50
  51         char *address;
  52         char *host;
  53         uint16_t port;
  54         unsigned long flags;
  55
  56         GIOChannel *transport_channel;
  57         guint transport_watch;
  58
  59         guint resolv_action;
  60         char *request;
  61
  62         char *line_buffer;
  63         char *line_offset;
  64         unsigned int line_space;
  65         char *current_line;
  66         gboolean header_done;
  67
  68         GWebResult result;
  69
  70         GWebResultFunc result_func;
  71         gpointer result_data;
  72 };
  73
  74 struct _GWeb {
  75         gint ref_count;
  76
  77         guint next_query_id;
  78
  79         int index;
  80         GList *session_list;
  81
  82         GResolv *resolv;
  83         char *accept_option;
  84         char *user_agent;
  85         gboolean close_connection;
  86
  87         GWebDebugFunc debug_func;
  88         gpointer debug_data;
  89 };
  90
  91 static inline void debug(GWeb *web, const char *format, ...)
  92 {
  93         char str[256];
  94         va_list ap;
  95
  96         if (web->debug_func == NULL)
  97                 return;
  98
  99         va_start(ap, format);
 100
 101         if (vsnprintf(str, sizeof(str), format, ap) > 0)
 102                 web->debug_func(str, web->debug_data);
 103
 104         va_end(ap);
 105 }
 106
 107 static void free_session(struct web_session *session)
 108 {
 109         GWeb *web = session->web;
 110
 111         if (session == NULL)
 112                 return;
 113
 114         g_free(session->request);
 115
 116         if (session->resolv_action > 0)
 117                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 118
 119         if (session->transport_watch > 0)
 120                 g_source_remove(session->transport_watch);
 121
 122         if (session->transport_channel != NULL)
 123                 g_io_channel_unref(session->transport_channel);
 124
 125         g_free(session->line_buffer);
 126
 127         g_free(session->host);
 128         g_free(session->address);
 129         g_free(session);
 130 }
 131
 132 static void flush_sessions(GWeb *web)
 133 {
 134         GList *list;
 135
 136         for (list = g_list_first(web->session_list);
 137                                         list; list = g_list_next(list))
 138                 free_session(list->data);
 139
 140         g_list_free(web->session_list);
 141         web->session_list = NULL;
 142 }
 143
 144 GWeb *g_web_new(int index)
 145 {
 146         GWeb *web;
 147
 148         if (index < 0)
 149                 return NULL;
 150
 151         web = g_try_new0(GWeb, 1);
 152         if (web == NULL)
 153                 return NULL;
 154
 155         web->ref_count = 1;
 156
 157         web->next_query_id = 1;
 158
 159         web->index = index;
 160         web->session_list = NULL;
 161
 162         web->resolv = g_resolv_new(index);
 163         if (web->resolv == NULL) {
 164                 g_free(web);
 165                 return NULL;
 166         }
 167
 168         web->accept_option = g_strdup("*/*");
 169         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 170         web->close_connection = FALSE;
 171
 172         return web;
 173 }
 174
 175 GWeb *g_web_ref(GWeb *web)
 176 {
 177         if (web == NULL)
 178                 return NULL;
 179
 180         g_atomic_int_inc(&web->ref_count);
 181
 182         return web;
 183 }
 184
 185 void g_web_unref(GWeb *web)
 186 {
 187         if (web == NULL)
 188                 return;
 189
 190         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 191                 return;
 192
 193         flush_sessions(web);
 194
 195         g_resolv_unref(web->resolv);
 196
 197         g_free(web->accept_option);
 198         g_free(web->user_agent);
 199         g_free(web);
 200 }
 201
 202 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 203 {
 204         if (web == NULL)
 205                 return;
 206
 207         web->debug_func = func;
 208         web->debug_data = user_data;
 209
 210         g_resolv_set_debug(web->resolv, func, user_data);
 211 }
 212
 213 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 214 {
 215         if (web == NULL)
 216                 return FALSE;
 217
 218         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 219
 220         return TRUE;
 221 }
 222
 223 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 224 {
 225         g_free(web->accept_option);
 226
 227         if (format == NULL) {
 228                 web->accept_option = NULL;
 229                 debug(web, "clearing accept option");
 230         } else {
 231                 web->accept_option = g_strdup_vprintf(format, args);
 232                 debug(web, "setting accept %s", web->accept_option);
 233         }
 234
 235         return TRUE;
 236 }
 237
 238 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 239 {
 240         va_list args;
 241         gboolean result;
 242
 243         if (web == NULL)
 244                 return FALSE;
 245
 246         va_start(args, format);
 247         result = set_accept_option(web, format, args);
 248         va_end(args);
 249
 250         return result;
 251 }
 252
 253 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 254 {
 255         g_free(web->user_agent);
 256
 257         if (format == NULL) {
 258                 web->user_agent = NULL;
 259                 debug(web, "clearing user agent");
 260         } else {
 261                 web->user_agent = g_strdup_vprintf(format, args);
 262                 debug(web, "setting user agent %s", web->user_agent);
 263         }
 264
 265         return TRUE;
 266 }
 267
 268 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 269 {
 270         va_list args;
 271         gboolean result;
 272
 273         if (web == NULL)
 274                 return FALSE;
 275
 276         va_start(args, format);
 277         result = set_user_agent(web, format, args);
 278         va_end(args);
 279
 280         return result;
 281 }
 282
 283 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 284 {
 285         if (web == NULL)
 286                 return;
 287
 288         web->close_connection = enabled;
 289 }
 290
 291 gboolean g_web_get_close_connection(GWeb *web)
 292 {
 293         if (web == NULL)
 294                 return FALSE;
 295
 296         return web->close_connection;
 297 }
 298
 299 static inline void call_result_func(struct web_session *session, guint status)
 300 {
 301         if (session->result_func == NULL)
 302                 return;
 303
 304         session->result_func(status, &session->result, session->result_data);
 305 }
 306
 307 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 308                                                         gpointer user_data)
 309 {
 310         struct web_session *session = user_data;
 311         gsize bytes_read, consumed = 0;
 312         GIOStatus status;
 313         size_t count;
 314         char *str;
 315
 316         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 317                 session->transport_watch = 0;
 318                 call_result_func(session, 400);
 319                 return FALSE;
 320         }
 321
 322         status = g_io_channel_read_chars(channel, session->line_offset,
 323                                 session->line_space, &bytes_read, NULL);
 324
 325         debug(session->web, "status %u bytes read %zu", status, bytes_read);
 326
 327         if (status != G_IO_STATUS_NORMAL) {
 328                 session->transport_watch = 0;
 329                 call_result_func(session, 200);
 330                 return FALSE;
 331         }
 332
 333         if (session->header_done == TRUE) {
 334                 session->result.length = bytes_read;
 335                 call_result_func(session, 100);
 336                 return TRUE;
 337         }
 338
 339         str = memchr(session->line_offset, '\n', bytes_read);
 340
 341         while (str != NULL) {
 342                 char *start = session->current_line;
 343
 344                 *str = '\0';
 345                 count = strlen(start);
 346                 if (count > 0 && start[count - 1] == '\r') {
 347                         start[--count] = '\0';
 348                         consumed++;
 349                 }
 350
 351                 session->current_line = str + 1;
 352                 consumed += count + 1;
 353
 354                 if (count == 0) {
 355                         const void *ptr = session->current_line;
 356                         session->header_done = TRUE;
 357                         session->result.buffer = ptr;
 358                         session->result.length = bytes_read - consumed;
 359                         call_result_func(session, 100);
 360                         break;
 361                 }
 362
 363                 //printf("[ %s ]\n", start);
 364
 365                 str = memchr(session->current_line, '\n',
 366                                         bytes_read - consumed);
 367         }
 368
 369         if (session->header_done == TRUE) {
 370                 gsize size = session->line_offset - session->line_buffer;
 371
 372                 session->line_offset = session->line_buffer;
 373                 session->line_space += size;
 374
 375                 session->result.buffer = (const guint8 *) session->line_offset;
 376                 return TRUE;
 377         }
 378
 379         session->line_offset += bytes_read;
 380         session->line_space -= bytes_read;
 381
 382         if (session->line_space < 32) {
 383                 gsize size = session->line_offset - session->line_buffer;
 384                 gsize pos = session->current_line - session->line_buffer;
 385                 char *buf;
 386
 387                 printf("realloc, space %u size %zu\n",
 388                                         session->line_space, size);
 389
 390                 buf = g_try_realloc(session->line_buffer,
 391                                                 size + LINE_CHUNK_SIZE);
 392                 if (buf != NULL) {
 393                         session->line_buffer = buf;
 394                         session->line_offset = buf + size;
 395                         session->line_space = LINE_CHUNK_SIZE;
 396                         session->current_line = buf + pos;
 397                 }
 398         }
 399
 400         return TRUE;
 401 }
 402
 403 static int connect_session_transport(struct web_session *session)
 404 {
 405         struct sockaddr_in sin;
 406         int sk;
 407
 408         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 409         if (sk < 0)
 410                 return -EIO;
 411
 412         memset(&sin, 0, sizeof(sin));
 413         sin.sin_family = AF_INET;
 414         sin.sin_port = htons(session->port);
 415         sin.sin_addr.s_addr = inet_addr(session->address);
 416
 417         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 418                 close(sk);
 419                 return -EIO;
 420         }
 421
 422         if (session->flags & SESSION_FLAG_USE_TLS)
 423                 session->transport_channel = g_io_channel_gnutls_new(sk);
 424         else
 425                 session->transport_channel = g_io_channel_unix_new(sk);
 426
 427         if (session->transport_channel == NULL) {
 428                 close(sk);
 429                 return -ENOMEM;
 430         }
 431
 432         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 433         g_io_channel_set_buffered(session->transport_channel, FALSE);
 434
 435         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 436
 437         session->transport_watch = g_io_add_watch(session->transport_channel,
 438                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 439                                                 received_data, session);
 440
 441         return 0;
 442 }
 443
 444 static int create_transport(struct web_session *session)
 445 {
 446         int err;
 447
 448         err = connect_session_transport(session);
 449         if (err < 0)
 450                 return err;
 451
 452         debug(session->web, "creating session %s:%u",
 453                                         session->address, session->port);
 454
 455         return 0;
 456 }
 457
 458 static void start_request(struct web_session *session)
 459 {
 460         GString *buf;
 461         gchar *str;
 462         gsize count, bytes_written;
 463         GIOStatus status;
 464
 465         debug(session->web, "request %s from %s",
 466                                         session->request, session->host);
 467
 468         buf = g_string_new(NULL);
 469         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 470         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 471         if (session->web->user_agent != NULL)
 472                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 473                                                 session->web->user_agent);
 474         if (session->web->accept_option != NULL)
 475                 g_string_append_printf(buf, "Accept: %s\r\n",
 476                                                 session->web->accept_option);
 477         if (session->web->close_connection == TRUE)
 478                 g_string_append(buf, "Connection: close\r\n");
 479         g_string_append(buf, "\r\n");
 480         str = g_string_free(buf, FALSE);
 481
 482         count = strlen(str);
 483
 484         debug(session->web, "bytes to write %zu", count);
 485
 486         status = g_io_channel_write_chars(session->transport_channel,
 487                                         str, count, &bytes_written, NULL);
 488
 489         debug(session->web, "status %u bytes written %zu",
 490                                                 status, bytes_written);
 491
 492         //printf("%s", str);
 493
 494         g_free(str);
 495 }
 496
 497 static int parse_url(struct web_session *session, const char *url)
 498 {
 499         char *scheme, *host, *port, *path;
 500
 501         scheme = g_strdup(url);
 502         if (scheme == NULL)
 503                 return -EINVAL;
 504
 505         host = strstr(scheme, "://");
 506         if (host != NULL) {
 507                 *host = '\0';
 508                 host += 3;
 509
 510                 if (strcasecmp(scheme, "https") == 0) {
 511                         session->port = 443;
 512                         session->flags |= SESSION_FLAG_USE_TLS;
 513                 } else if (strcasecmp(scheme, "http") == 0) {
 514                         session->port = 80;
 515                 } else {
 516                         g_free(scheme);
 517                         return -EINVAL;
 518                 }
 519         } else {
 520                 host = scheme;
 521                 session->port = 80;
 522         }
 523
 524         path = strchr(host, '/');
 525         if (path != NULL)
 526                 *(path++) = '\0';
 527
 528         session->request = g_strdup_printf("/%s", path ? path : "");
 529
 530         port = strrchr(host, ':');
 531         if (port != NULL) {
 532                 char *end;
 533                 int tmp = strtol(port + 1, &end, 10);
 534
 535                 if (*end == '\0') {
 536                         *port = '\0';
 537                         session->port = tmp;
 538                 }
 539         }
 540
 541         session->host = g_strdup(host);
 542
 543         g_free(scheme);
 544
 545         return 0;
 546 }
 547
 548 static void resolv_result(GResolvResultStatus status,
 549                                         char **results, gpointer user_data)
 550 {
 551         struct web_session *session = user_data;
 552
 553         if (results == NULL || results[0] == NULL) {
 554                 call_result_func(session, 404);
 555                 return;
 556         }
 557
 558         debug(session->web, "address %s", results[0]);
 559
 560         if (inet_aton(results[0], NULL) == 0) {
 561                 call_result_func(session, 400);
 562                 return;
 563         }
 564
 565         session->address = g_strdup(results[0]);
 566
 567         if (create_transport(session) < 0) {
 568                 call_result_func(session, 409);
 569                 return;
 570         }
 571
 572         start_request(session);
 573 }
 574
 575 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 576                                 GWebResultFunc func, gpointer user_data)
 577 {
 578         struct web_session *session;
 579
 580         if (web == NULL || url == NULL)
 581                 return 0;
 582
 583         debug(web, "request %s", url);
 584
 585         session = g_try_new0(struct web_session, 1);
 586         if (session == NULL)
 587                 return 0;
 588
 589         if (parse_url(session, url) < 0) {
 590                 free_session(session);
 591                 return 0;
 592         }
 593
 594         debug(web, "host %s:%u", session->host, session->port);
 595         debug(web, "flags %lu", session->flags);
 596
 597         session->web = web;
 598
 599         session->result_func = func;
 600         session->result_data = user_data;
 601
 602         session->line_buffer = g_try_malloc(LINE_CHUNK_SIZE);
 603         session->line_offset = session->line_buffer;
 604         session->line_space = LINE_CHUNK_SIZE;
 605         session->current_line = session->line_buffer;
 606         session->header_done = FALSE;
 607
 608         if (inet_aton(session->host, NULL) == 0) {
 609                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 610                                         session->host, resolv_result, session);
 611                 if (session->resolv_action == 0) {
 612                         free_session(session);
 613                         return 0;
 614                 }
 615         } else {
 616                 session->address = g_strdup(session->host);
 617
 618                 if (create_transport(session) < 0) {
 619                         free_session(session);
 620                         return 0;
 621                 }
 622
 623                 start_request(session);
 624         }
 625
 626         web->session_list = g_list_append(web->session_list, session);
 627
 628         return web->next_query_id++;
 629 }
 630
 631 gboolean g_web_result_get_chunk(GWebResult *result,
 632                                 const guint8 **chunk, gsize *length)
 633 {
 634         if (result == NULL)
 635                 return FALSE;
 636
 637         if (chunk == NULL)
 638                 return FALSE;
 639
 640         *chunk = result->buffer;
 641
 642         if (length != NULL)
 643                 *length = result->length;
 644
 645         return TRUE;
 646 }