uclient.c

   1 /*
   2  * uclient - ustream based protocol client library
   3  *
   4  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include <arpa/inet.h>
  19 #include <libubox/ustream-ssl.h>
  20 #include "uclient.h"
  21 #include "uclient-utils.h"
  22 #include "uclient-backend.h"
  23
  24 char *uclient_get_addr(char *dest, int *port, union uclient_addr *a)
  25 {
  26         int portval;
  27         void *ptr;
  28
  29         switch(a->sa.sa_family) {
  30         case AF_INET:
  31                 ptr = &a->sin.sin_addr;
  32                 portval = a->sin.sin_port;
  33                 break;
  34         case AF_INET6:
  35                 ptr = &a->sin6.sin6_addr;
  36                 portval = a->sin6.sin6_port;
  37                 break;
  38         default:
  39                 return strcpy(dest, "Unknown");
  40         }
  41
  42         inet_ntop(a->sa.sa_family, ptr, dest, INET6_ADDRSTRLEN);
  43         if (port)
  44                 *port = ntohs(portval);
  45
  46         return dest;
  47 }
  48
  49 static struct uclient_url *
  50 __uclient_get_url(const struct uclient_backend *backend,
  51                   const char *host, int host_len,
  52                   const char *location, const char *auth_str)
  53 {
  54         struct uclient_url *url;
  55         char *host_buf, *uri_buf, *auth_buf, *next;
  56
  57         url = calloc_a(sizeof(*url),
  58                 &host_buf, host_len + 1,
  59                 &uri_buf, strlen(location) + 1,
  60                 &auth_buf, auth_str ? strlen(auth_str) + 1 : 0);
  61
  62         url->backend = backend;
  63         url->location = strcpy(uri_buf, location);
  64         if (host)
  65                 url->host = strncpy(host_buf, host, host_len);
  66
  67         next = strchr(host_buf, '@');
  68         if (next) {
  69                 *next = 0;
  70                 url->host = next + 1;
  71
  72                 if (uclient_urldecode(host_buf, host_buf, false) < 0)
  73                         goto free;
  74
  75                 url->auth = host_buf;
  76         }
  77
  78         if (!url->auth && auth_str)
  79                 url->auth = strcpy(auth_buf, auth_str);
  80
  81         /* Literal IPv6 address */
  82         if (*url->host == '[') {
  83                 url->host++;
  84                 next = strrchr(url->host, ']');
  85                 if (!next)
  86                         goto free;
  87
  88                 *(next++) = 0;
  89                 if (*next == ':')
  90                         url->port = next + 1;
  91         } else {
  92                 next = strrchr(url->host, ':');
  93                 if (next) {
  94                         *next = 0;
  95                         url->port = next + 1;
  96                 }
  97         }
  98
  99         return url;
 100
 101 free:
 102         free(url);
 103         return NULL;
 104 }
 105
 106 static const char *
 107 uclient_split_host(const char *base, int *host_len)
 108 {
 109         char *next, *location;
 110
 111         next = strchr(base, '/');
 112         if (next) {
 113                 location = next;
 114                 *host_len = next - base;
 115         } else {
 116                 location = "/";
 117                 *host_len = strlen(base);
 118         }
 119
 120         return location;
 121 }
 122
 123 struct uclient_url __hidden *
 124 uclient_get_url(const char *url_str, const char *auth_str)
 125 {
 126         static const struct uclient_backend *backends[] = {
 127                 &uclient_backend_http,
 128         };
 129
 130         const struct uclient_backend *backend;
 131         const char * const *prefix = NULL;
 132         struct uclient_url *url;
 133         const char *location;
 134         int host_len;
 135         int i;
 136
 137         for (i = 0; i < ARRAY_SIZE(backends); i++) {
 138                 int prefix_len = 0;
 139
 140                 for (prefix = backends[i]->prefix; *prefix; prefix++) {
 141                         prefix_len = strlen(*prefix);
 142
 143                         if (!strncmp(url_str, *prefix, prefix_len))
 144                                 break;
 145                 }
 146
 147                 if (!*prefix)
 148                         continue;
 149
 150                 url_str += prefix_len;
 151                 backend = backends[i];
 152                 break;
 153         }
 154
 155         if (!*prefix)
 156                 return NULL;
 157
 158         location = uclient_split_host(url_str, &host_len);
 159         url = __uclient_get_url(backend, url_str, host_len, location, auth_str);
 160         if (!url)
 161                 return NULL;
 162
 163         url->prefix = prefix - backend->prefix;
 164         return url;
 165 }
 166
 167 static void uclient_connection_timeout(struct uloop_timeout *timeout)
 168 {
 169         struct uclient *cl = container_of(timeout, struct uclient, connection_timeout);
 170
 171         if (cl->backend->disconnect)
 172                 cl->backend->disconnect(cl);
 173
 174         uclient_backend_set_error(cl, UCLIENT_ERROR_TIMEDOUT);
 175 }
 176
 177 struct uclient *uclient_new(const char *url_str, const char *auth_str, const struct uclient_cb *cb)
 178 {
 179         struct uclient *cl;
 180         struct uclient_url *url;
 181
 182         url = uclient_get_url(url_str, auth_str);
 183         if (!url)
 184                 return NULL;
 185
 186         cl = url->backend->alloc();
 187         if (!cl)
 188                 return NULL;
 189
 190         cl->backend = url->backend;
 191         cl->cb = cb;
 192         cl->url = url;
 193         cl->timeout_msecs = UCLIENT_DEFAULT_TIMEOUT_MS;
 194         cl->connection_timeout.cb = uclient_connection_timeout;
 195
 196         return cl;
 197 }
 198
 199 int uclient_set_proxy_url(struct uclient *cl, const char *url_str, const char *auth_str)
 200 {
 201         const struct uclient_backend *backend = cl->backend;
 202         struct uclient_url *url;
 203         const char *location;
 204         int host_len;
 205         char *next, *host;
 206
 207         if (!backend->update_proxy_url)
 208                 return -1;
 209
 210         next = strstr(url_str, "://");
 211         if (!next)
 212                 return -1;
 213
 214         host = next + 3;
 215         location = uclient_split_host(host, &host_len);
 216
 217         url = __uclient_get_url(NULL, host, host_len, url_str, auth_str);
 218         if (!url)
 219                 return -1;
 220
 221         free(cl->proxy_url);
 222         cl->proxy_url = url;
 223
 224         if (backend->update_proxy_url)
 225                 backend->update_proxy_url(cl);
 226
 227         return 0;
 228 }
 229
 230 int uclient_set_url(struct uclient *cl, const char *url_str, const char *auth_str)
 231 {
 232         const struct uclient_backend *backend = cl->backend;
 233         struct uclient_url *url = cl->url;
 234
 235         url = uclient_get_url(url_str, auth_str);
 236         if (!url)
 237                 return -1;
 238
 239         if (url->backend != cl->backend) {
 240                 free(url);
 241                 return -1;
 242         }
 243
 244         free(cl->proxy_url);
 245         cl->proxy_url = NULL;
 246
 247         free(cl->url);
 248         cl->url = url;
 249
 250         if (backend->update_url)
 251                 backend->update_url(cl);
 252
 253         return 0;
 254 }
 255
 256 int uclient_set_timeout(struct uclient *cl, int msecs)
 257 {
 258         if (msecs <= 0)
 259                 return -EINVAL;
 260
 261         cl->timeout_msecs = msecs;
 262
 263         return 0;
 264 }
 265
 266 int uclient_connect(struct uclient *cl)
 267 {
 268         return cl->backend->connect(cl);
 269 }
 270
 271 void uclient_free(struct uclient *cl)
 272 {
 273         struct uclient_url *url = cl->url;
 274
 275         if (cl->backend->free)
 276                 cl->backend->free(cl);
 277         else
 278                 free(cl);
 279
 280         free(url);
 281 }
 282
 283 int uclient_write(struct uclient *cl, const char *buf, int len)
 284 {
 285         if (!cl->backend->write)
 286                 return -1;
 287
 288         return cl->backend->write(cl, buf, len);
 289 }
 290
 291 int uclient_request(struct uclient *cl)
 292 {
 293         int err;
 294
 295         if (!cl->backend->request)
 296                 return -1;
 297
 298         err = cl->backend->request(cl);
 299         if (err)
 300                 return err;
 301
 302         uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
 303
 304         return 0;
 305 }
 306
 307 int uclient_read(struct uclient *cl, char *buf, int len)
 308 {
 309         if (!cl->backend->read)
 310                 return -1;
 311
 312         return cl->backend->read(cl, buf, len);
 313 }
 314
 315 void uclient_disconnect(struct uclient *cl)
 316 {
 317         uloop_timeout_cancel(&cl->connection_timeout);
 318
 319         if (!cl->backend->disconnect)
 320                 return;
 321
 322         cl->backend->disconnect(cl);
 323 }
 324
 325 static void __uclient_backend_change_state(struct uloop_timeout *timeout)
 326 {
 327         struct uclient *cl = container_of(timeout, struct uclient, timeout);
 328
 329         if (cl->error_code && cl->cb->error)
 330                 cl->cb->error(cl, cl->error_code);
 331         else if (cl->eof && cl->cb->data_eof)
 332                 cl->cb->data_eof(cl);
 333 }
 334
 335 static void uclient_backend_change_state(struct uclient *cl)
 336 {
 337         cl->timeout.cb = __uclient_backend_change_state;
 338         uloop_timeout_set(&cl->timeout, 1);
 339 }
 340
 341 void __hidden uclient_backend_set_error(struct uclient *cl, int code)
 342 {
 343         if (cl->error_code)
 344                 return;
 345
 346         uloop_timeout_cancel(&cl->connection_timeout);
 347         cl->error_code = code;
 348         uclient_backend_change_state(cl);
 349 }
 350
 351 void __hidden uclient_backend_set_eof(struct uclient *cl)
 352 {
 353         if (cl->eof || cl->error_code)
 354                 return;
 355
 356         uloop_timeout_cancel(&cl->connection_timeout);
 357         cl->eof = true;
 358         uclient_backend_change_state(cl);
 359 }
 360
 361 void __hidden uclient_backend_reset_state(struct uclient *cl)
 362 {
 363         cl->data_eof = false;
 364         cl->eof = false;
 365         cl->error_code = 0;
 366         uloop_timeout_cancel(&cl->timeout);
 367 }