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 SESSION_FLAG_USE_TLS    (1 << 0)
  40
  41 struct _GWebResult {
  42 };
  43
  44 struct web_session {
  45         GWeb *web;
  46
  47         char *address;
  48         char *host;
  49         uint16_t port;
  50         unsigned long flags;
  51
  52         GIOChannel *transport_channel;
  53         guint transport_watch;
  54
  55         guint resolv_action;
  56         char *request;
  57
  58         GWebResult *result;
  59
  60         GWebResultFunc result_func;
  61         gpointer result_data;
  62 };
  63
  64 struct _GWeb {
  65         gint ref_count;
  66
  67         guint next_query_id;
  68
  69         int index;
  70         GList *session_list;
  71
  72         GResolv *resolv;
  73         char *accept_option;
  74         char *user_agent;
  75         gboolean close_connection;
  76
  77         GWebDebugFunc debug_func;
  78         gpointer debug_data;
  79 };
  80
  81 static inline void debug(GWeb *web, const char *format, ...)
  82 {
  83         char str[256];
  84         va_list ap;
  85
  86         if (web->debug_func == NULL)
  87                 return;
  88
  89         va_start(ap, format);
  90
  91         if (vsnprintf(str, sizeof(str), format, ap) > 0)
  92                 web->debug_func(str, web->debug_data);
  93
  94         va_end(ap);
  95 }
  96
  97 static void free_session(struct web_session *session)
  98 {
  99         GWeb *web = session->web;
 100
 101         if (session == NULL)
 102                 return;
 103
 104         g_free(session->request);
 105
 106         if (session->resolv_action > 0)
 107                 g_resolv_cancel_lookup(web->resolv, session->resolv_action);
 108
 109         if (session->transport_watch > 0)
 110                 g_source_remove(session->transport_watch);
 111
 112         if (session->transport_channel != NULL)
 113                 g_io_channel_unref(session->transport_channel);
 114
 115         g_free(session->host);
 116         g_free(session->address);
 117         g_free(session);
 118 }
 119
 120 static void flush_sessions(GWeb *web)
 121 {
 122         GList *list;
 123
 124         for (list = g_list_first(web->session_list);
 125                                         list; list = g_list_next(list))
 126                 free_session(list->data);
 127
 128         g_list_free(web->session_list);
 129         web->session_list = NULL;
 130 }
 131
 132 GWeb *g_web_new(int index)
 133 {
 134         GWeb *web;
 135
 136         if (index < 0)
 137                 return NULL;
 138
 139         web = g_try_new0(GWeb, 1);
 140         if (web == NULL)
 141                 return NULL;
 142
 143         web->ref_count = 1;
 144
 145         web->next_query_id = 1;
 146
 147         web->index = index;
 148         web->session_list = NULL;
 149
 150         web->resolv = g_resolv_new(index);
 151         if (web->resolv == NULL) {
 152                 g_free(web);
 153                 return NULL;
 154         }
 155
 156         web->accept_option = g_strdup("*/*");
 157         web->user_agent = g_strdup_printf("GWeb/%s", VERSION);
 158         web->close_connection = FALSE;
 159
 160         return web;
 161 }
 162
 163 GWeb *g_web_ref(GWeb *web)
 164 {
 165         if (web == NULL)
 166                 return NULL;
 167
 168         g_atomic_int_inc(&web->ref_count);
 169
 170         return web;
 171 }
 172
 173 void g_web_unref(GWeb *web)
 174 {
 175         if (web == NULL)
 176                 return;
 177
 178         if (g_atomic_int_dec_and_test(&web->ref_count) == FALSE)
 179                 return;
 180
 181         flush_sessions(web);
 182
 183         g_resolv_unref(web->resolv);
 184
 185         g_free(web->accept_option);
 186         g_free(web->user_agent);
 187         g_free(web);
 188 }
 189
 190 void g_web_set_debug(GWeb *web, GWebDebugFunc func, gpointer user_data)
 191 {
 192         if (web == NULL)
 193                 return;
 194
 195         web->debug_func = func;
 196         web->debug_data = user_data;
 197
 198         g_resolv_set_debug(web->resolv, func, user_data);
 199 }
 200
 201 gboolean g_web_add_nameserver(GWeb *web, const char *address)
 202 {
 203         if (web == NULL)
 204                 return FALSE;
 205
 206         g_resolv_add_nameserver(web->resolv, address, 53, 0);
 207
 208         return TRUE;
 209 }
 210
 211 static gboolean set_accept_option(GWeb *web, const char *format, va_list args)
 212 {
 213         g_free(web->accept_option);
 214
 215         if (format == NULL) {
 216                 web->accept_option = NULL;
 217                 debug(web, "clearing accept option");
 218         } else {
 219                 web->accept_option = g_strdup_vprintf(format, args);
 220                 debug(web, "setting accept %s", web->accept_option);
 221         }
 222
 223         return TRUE;
 224 }
 225
 226 gboolean g_web_set_accept(GWeb *web, const char *format, ...)
 227 {
 228         va_list args;
 229         gboolean result;
 230
 231         if (web == NULL)
 232                 return FALSE;
 233
 234         va_start(args, format);
 235         result = set_accept_option(web, format, args);
 236         va_end(args);
 237
 238         return result;
 239 }
 240
 241 static gboolean set_user_agent(GWeb *web, const char *format, va_list args)
 242 {
 243         g_free(web->user_agent);
 244
 245         if (format == NULL) {
 246                 web->user_agent = NULL;
 247                 debug(web, "clearing user agent");
 248         } else {
 249                 web->user_agent = g_strdup_vprintf(format, args);
 250                 debug(web, "setting user agent %s", web->user_agent);
 251         }
 252
 253         return TRUE;
 254 }
 255
 256 gboolean g_web_set_user_agent(GWeb *web, const char *format, ...)
 257 {
 258         va_list args;
 259         gboolean result;
 260
 261         if (web == NULL)
 262                 return FALSE;
 263
 264         va_start(args, format);
 265         result = set_user_agent(web, format, args);
 266         va_end(args);
 267
 268         return result;
 269 }
 270
 271 void g_web_set_close_connection(GWeb *web, gboolean enabled)
 272 {
 273         if (web == NULL)
 274                 return;
 275
 276         web->close_connection = enabled;
 277 }
 278
 279 gboolean g_web_get_close_connection(GWeb *web)
 280 {
 281         if (web == NULL)
 282                 return FALSE;
 283
 284         return web->close_connection;
 285 }
 286
 287 static gboolean received_data(GIOChannel *channel, GIOCondition cond,
 288                                                         gpointer user_data)
 289 {
 290         struct web_session *session = user_data;
 291         gchar buf[4096];
 292         gsize bytes_read;
 293         GIOStatus status;
 294
 295         if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
 296                 session->transport_watch = 0;
 297                 if (session->result_func != NULL)
 298                         session->result_func(400, NULL, session->result_data);
 299                 return FALSE;
 300         }
 301
 302         memset(buf, 0, sizeof(buf));
 303         status = g_io_channel_read_chars(channel, buf, sizeof(buf) - 1,
 304                                                 &bytes_read, NULL);
 305
 306         debug(session->web, "status %u bytes read %zu", status, bytes_read);
 307
 308         if (status != G_IO_STATUS_NORMAL) {
 309                 session->transport_watch = 0;
 310                 if (session->result_func != NULL)
 311                         session->result_func(200, NULL, session->result_data);
 312                 return FALSE;
 313         }
 314
 315         printf("%s", buf);
 316
 317         return TRUE;
 318 }
 319
 320 static int connect_session_transport(struct web_session *session)
 321 {
 322         struct sockaddr_in sin;
 323         int sk;
 324
 325         sk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 326         if (sk < 0)
 327                 return -EIO;
 328
 329         memset(&sin, 0, sizeof(sin));
 330         sin.sin_family = AF_INET;
 331         sin.sin_port = htons(session->port);
 332         sin.sin_addr.s_addr = inet_addr(session->address);
 333
 334         if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 335                 close(sk);
 336                 return -EIO;
 337         }
 338
 339         debug(session->web, "flags %lu", session->flags);
 340
 341         if (session->flags & SESSION_FLAG_USE_TLS)
 342                 session->transport_channel = g_io_channel_gnutls_new(sk);
 343         else
 344                 session->transport_channel = g_io_channel_unix_new(sk);
 345
 346         if (session->transport_channel == NULL) {
 347                 close(sk);
 348                 return -ENOMEM;
 349         }
 350
 351         g_io_channel_set_encoding(session->transport_channel, NULL, NULL);
 352         g_io_channel_set_buffered(session->transport_channel, FALSE);
 353
 354         g_io_channel_set_close_on_unref(session->transport_channel, TRUE);
 355
 356         session->transport_watch = g_io_add_watch(session->transport_channel,
 357                                 G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
 358                                                 received_data, session);
 359
 360         return 0;
 361 }
 362
 363 static int create_transport(struct web_session *session)
 364 {
 365         int err;
 366
 367         err = connect_session_transport(session);
 368         if (err < 0)
 369                 return err;
 370
 371         debug(session->web, "creating session %s:%u",
 372                                         session->address, session->port);
 373
 374         return 0;
 375 }
 376
 377 static void start_request(struct web_session *session)
 378 {
 379         GString *buf;
 380         gchar *str;
 381         gsize count, bytes_written;
 382         GIOStatus status;
 383
 384         debug(session->web, "request %s from %s",
 385                                         session->request, session->host);
 386
 387         buf = g_string_new(NULL);
 388         g_string_append_printf(buf, "GET %s HTTP/1.1\r\n", session->request);
 389         g_string_append_printf(buf, "Host: %s\r\n", session->host);
 390         if (session->web->user_agent != NULL)
 391                 g_string_append_printf(buf, "User-Agent: %s\r\n",
 392                                                 session->web->user_agent);
 393         if (session->web->accept_option != NULL)
 394                 g_string_append_printf(buf, "Accept: %s\r\n",
 395                                                 session->web->accept_option);
 396         if (session->web->close_connection == TRUE)
 397                 g_string_append(buf, "Connection: close\r\n");
 398         g_string_append(buf, "\r\n");
 399         str = g_string_free(buf, FALSE);
 400
 401         count = strlen(str);
 402
 403         debug(session->web, "bytes to write %zu", count);
 404
 405         status = g_io_channel_write_chars(session->transport_channel,
 406                                         str, count, &bytes_written, NULL);
 407
 408         debug(session->web, "status %u bytes written %zu",
 409                                                 status, bytes_written);
 410
 411         printf("%s", str);
 412
 413         g_free(str);
 414 }
 415
 416 static int parse_url(struct web_session *session, const char *url)
 417 {
 418         char *scheme, *host, *port, *path;
 419
 420         scheme = g_strdup(url);
 421         if (scheme == NULL)
 422                 return -EINVAL;
 423
 424         host = strstr(scheme, "://");
 425         if (host != NULL) {
 426                 *host = '\0';
 427                 host += 3;
 428
 429                 if (strcasecmp(scheme, "https") == 0) {
 430                         session->port = 443;
 431                         session->flags |= SESSION_FLAG_USE_TLS;
 432                 } else if (strcasecmp(scheme, "http") == 0) {
 433                         session->port = 80;
 434                 } else {
 435                         g_free(scheme);
 436                         return -EINVAL;
 437                 }
 438         } else {
 439                 host = scheme;
 440                 session->port = 80;
 441         }
 442
 443         path = strchr(host, '/');
 444         if (path != NULL)
 445                 *(path++) = '\0';
 446
 447         session->request = g_strdup_printf("/%s", path ? path : "");
 448
 449         port = strrchr(host, ':');
 450         if (port != NULL) {
 451                 char *end;
 452                 int tmp = strtol(port + 1, &end, 10);
 453
 454                 if (*end == '\0') {
 455                         *port = '\0';
 456                         session->port = tmp;
 457                 }
 458         }
 459
 460         session->host = g_strdup(host);
 461
 462         g_free(scheme);
 463
 464         return 0;
 465 }
 466
 467 static void resolv_result(GResolvResultStatus status,
 468                                         char **results, gpointer user_data)
 469 {
 470         struct web_session *session = user_data;
 471
 472         if (results == NULL || results[0] == NULL) {
 473                 if (session->result_func != NULL)
 474                         session->result_func(404, NULL, session->result_data);
 475                 return;
 476         }
 477
 478         debug(session->web, "address %s", results[0]);
 479
 480         if (inet_aton(results[0], NULL) == 0) {
 481                 if (session->result_func != NULL)
 482                         session->result_func(400, NULL, session->result_data);
 483                 return;
 484         }
 485
 486         session->address = g_strdup(results[0]);
 487
 488         if (create_transport(session) < 0) {
 489                 if (session->result_func != NULL)
 490                         session->result_func(409, NULL, session->result_data);
 491                 return;
 492         }
 493
 494         start_request(session);
 495 }
 496
 497 guint g_web_request(GWeb *web, GWebMethod method, const char *url,
 498                                 GWebResultFunc func, gpointer user_data)
 499 {
 500         struct web_session *session;
 501
 502         if (web == NULL || url == NULL)
 503                 return 0;
 504
 505         debug(web, "request %s", url);
 506
 507         session = g_try_new0(struct web_session, 1);
 508         if (session == NULL)
 509                 return 0;
 510
 511         if (parse_url(session, url) < 0) {
 512                 free_session(session);
 513                 return 0;
 514         }
 515
 516         debug(web, "host %s:%u", session->host, session->port);
 517         debug(web, "flags %lu", session->flags);
 518
 519         session->web = web;
 520
 521         session->result_func = func;
 522         session->result_data = user_data;
 523
 524         if (inet_aton(session->host, NULL) == 0) {
 525                 session->resolv_action = g_resolv_lookup_hostname(web->resolv,
 526                                         session->host, resolv_result, session);
 527                 if (session->resolv_action == 0) {
 528                         free_session(session);
 529                         return 0;
 530                 }
 531         } else {
 532                 session->address = g_strdup(session->host);
 533
 534                 if (create_transport(session) < 0) {
 535                         free_session(session);
 536                         return 0;
 537                 }
 538
 539                 start_request(session);
 540         }
 541
 542         web->session_list = g_list_append(web->session_list, session);
 543
 544         return web->next_query_id++;
 545 }