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