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         int host_len;
 204         char *next, *host;
 205
 206         if (!backend->update_proxy_url)
 207                 return -1;
 208
 209         next = strstr(url_str, "://");
 210         if (!next)
 211                 return -1;
 212
 213         host = next + 3;
 214         uclient_split_host(host, &host_len);
 215
 216         url = __uclient_get_url(NULL, host, host_len, url_str, auth_str);
 217         if (!url)
 218                 return -1;
 219
 220         free(cl->proxy_url);
 221         cl->proxy_url = url;
 222
 223         if (backend->update_proxy_url)
 224                 backend->update_proxy_url(cl);
 225
 226         return 0;
 227 }
 228
 229 int uclient_set_url(struct uclient *cl, const char *url_str, const char *auth_str)
 230 {
 231         const struct uclient_backend *backend = cl->backend;
 232         struct uclient_url *url = cl->url;
 233
 234         url = uclient_get_url(url_str, auth_str);
 235         if (!url)
 236                 return -1;
 237
 238         if (url->backend != cl->backend) {
 239                 free(url);
 240                 return -1;
 241         }
 242
 243         free(cl->proxy_url);
 244         cl->proxy_url = NULL;
 245
 246         free(cl->url);
 247         cl->url = url;
 248
 249         if (backend->update_url)
 250                 backend->update_url(cl);
 251
 252         return 0;
 253 }
 254
 255 int uclient_set_timeout(struct uclient *cl, int msecs)
 256 {
 257         if (msecs <= 0)
 258                 return -EINVAL;
 259
 260         cl->timeout_msecs = msecs;
 261
 262         return 0;
 263 }
 264
 265 int uclient_connect(struct uclient *cl)
 266 {
 267         return cl->backend->connect(cl);
 268 }
 269
 270 void uclient_free(struct uclient *cl)
 271 {
 272         struct uclient_url *url = cl->url;
 273
 274         if (cl->backend->free)
 275                 cl->backend->free(cl);
 276         else
 277                 free(cl);
 278
 279         free(url);
 280 }
 281
 282 int uclient_write(struct uclient *cl, const char *buf, int len)
 283 {
 284         if (!cl->backend->write)
 285                 return -1;
 286
 287         return cl->backend->write(cl, buf, len);
 288 }
 289
 290 int uclient_request(struct uclient *cl)
 291 {
 292         int err;
 293
 294         if (!cl->backend->request)
 295                 return -1;
 296
 297         err = cl->backend->request(cl);
 298         if (err)
 299                 return err;
 300
 301         uloop_timeout_set(&cl->connection_timeout, cl->timeout_msecs);
 302
 303         return 0;
 304 }
 305
 306 int uclient_read(struct uclient *cl, char *buf, int len)
 307 {
 308         if (!cl->backend->read)
 309                 return -1;
 310
 311         return cl->backend->read(cl, buf, len);
 312 }
 313
 314 void uclient_disconnect(struct uclient *cl)
 315 {
 316         uloop_timeout_cancel(&cl->connection_timeout);
 317
 318         if (!cl->backend->disconnect)
 319                 return;
 320
 321         cl->backend->disconnect(cl);
 322 }
 323
 324 static void __uclient_backend_change_state(struct uloop_timeout *timeout)
 325 {
 326         struct uclient *cl = container_of(timeout, struct uclient, timeout);
 327
 328         if (cl->error_code && cl->cb->error)
 329                 cl->cb->error(cl, cl->error_code);
 330         else if (cl->eof && cl->cb->data_eof)
 331                 cl->cb->data_eof(cl);
 332 }
 333
 334 static void uclient_backend_change_state(struct uclient *cl)
 335 {
 336         cl->timeout.cb = __uclient_backend_change_state;
 337         uloop_timeout_set(&cl->timeout, 1);
 338 }
 339
 340 void __hidden uclient_backend_set_error(struct uclient *cl, int code)
 341 {
 342         if (cl->error_code)
 343                 return;
 344
 345         uloop_timeout_cancel(&cl->connection_timeout);
 346         cl->error_code = code;
 347         uclient_backend_change_state(cl);
 348 }
 349
 350 void __hidden uclient_backend_set_eof(struct uclient *cl)
 351 {
 352         if (cl->eof || cl->error_code)
 353                 return;
 354
 355         uloop_timeout_cancel(&cl->connection_timeout);
 356         cl->eof = true;
 357         uclient_backend_change_state(cl);
 358 }
 359
 360 void __hidden uclient_backend_reset_state(struct uclient *cl)
 361 {
 362         cl->data_eof = false;
 363         cl->eof = false;
 364         cl->error_code = 0;
 365         uloop_timeout_cancel(&cl->timeout);
 366 }