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 <libubox/ustream-ssl.h>
  19 #include "uclient.h"
  20 #include "uclient-utils.h"
  21 #include "uclient-backend.h"
  22
  23 struct uclient_url __hidden *
  24 uclient_get_url(const char *url_str, const char *auth_str)
  25 {
  26         static const struct uclient_backend *backends[] = {
  27                 &uclient_backend_http,
  28         };
  29
  30         const struct uclient_backend *backend;
  31         const char * const *prefix = NULL;
  32         struct uclient_url *url;
  33         const char *location;
  34         char *host_buf, *uri_buf, *auth_buf, *next;
  35         int i, host_len;
  36
  37         for (i = 0; i < ARRAY_SIZE(backends); i++) {
  38                 int prefix_len = 0;
  39
  40                 for (prefix = backends[i]->prefix; *prefix; prefix++) {
  41                         prefix_len = strlen(*prefix);
  42
  43                         if (!strncmp(url_str, *prefix, prefix_len))
  44                                 break;
  45                 }
  46
  47                 if (!*prefix)
  48                         continue;
  49
  50                 url_str += prefix_len;
  51                 backend = backends[i];
  52                 break;
  53         }
  54
  55         if (!*prefix)
  56                 return NULL;
  57
  58         next = strchr(url_str, '/');
  59         if (next) {
  60                 location = next;
  61                 host_len = next - url_str;
  62         } else {
  63                 location = "/";
  64                 host_len = strlen(url_str);
  65         }
  66
  67         url = calloc_a(sizeof(*url),
  68                 &host_buf, host_len + 1,
  69                 &uri_buf, strlen(location) + 1,
  70                 &auth_buf, auth_str ? strlen(auth_str) + 1 : 0);
  71
  72         url->backend = backend;
  73         url->location = strcpy(uri_buf, location);
  74         url->prefix = prefix - backend->prefix;
  75
  76         url->host = strncpy(host_buf, url_str, host_len);
  77
  78         next = strchr(host_buf, '@');
  79         if (next) {
  80                 *next = 0;
  81                 url->host = next + 1;
  82
  83                 if (uclient_urldecode(host_buf, host_buf, false) < 0)
  84                         goto free;
  85
  86                 url->auth = host_buf;
  87         }
  88
  89         if (!url->auth && auth_str)
  90                 url->auth = strcpy(auth_buf, auth_str);
  91
  92         /* Literal IPv6 address */
  93         if (*url->host == '[') {
  94                 url->host++;
  95                 next = strrchr(url->host, ']');
  96                 if (!next)
  97                         goto free;
  98
  99                 *(next++) = 0;
 100                 if (*next == ':')
 101                         url->port = next + 1;
 102         } else {
 103                 next = strrchr(url->host, ':');
 104                 if (next)
 105                         url->port = next + 1;
 106         }
 107
 108         return url;
 109
 110 free:
 111         free(url);
 112         return NULL;
 113 }
 114
 115 struct uclient *uclient_new(const char *url_str, const struct uclient_cb *cb)
 116 {
 117         struct uclient *cl;
 118         struct uclient_url *url;
 119
 120         url = uclient_get_url(url_str, NULL);
 121         if (!url)
 122                 return NULL;
 123
 124         cl = url->backend->alloc();
 125         if (!cl)
 126                 return NULL;
 127
 128         cl->backend = url->backend;
 129         cl->cb = cb;
 130         cl->url = url;
 131
 132         return cl;
 133 }
 134
 135 int uclient_connect_url(struct uclient *cl, const char *url_str)
 136 {
 137         struct uclient_url *url = cl->url;
 138         const struct uclient_backend *backend = cl->backend;
 139
 140         if (url_str) {
 141                 url = uclient_get_url(url_str, NULL);
 142                 if (!url)
 143                         return -1;
 144
 145                 if (url->backend != cl->backend)
 146                         return -1;
 147
 148                 free(cl->url);
 149                 cl->url = url;
 150
 151                 if (backend->update_url)
 152                         backend->update_url(cl);
 153         }
 154
 155         return backend->connect(cl);
 156 }
 157
 158 void uclient_free(struct uclient *cl)
 159 {
 160         struct uclient_url *url = cl->url;
 161
 162         if (cl->backend->free)
 163                 cl->backend->free(cl);
 164         else
 165                 free(cl);
 166
 167         free(url);
 168 }
 169
 170 int uclient_write(struct uclient *cl, char *buf, int len)
 171 {
 172         if (!cl->backend->write)
 173                 return -1;
 174
 175         return cl->backend->write(cl, buf, len);
 176 }
 177
 178 int uclient_request(struct uclient *cl)
 179 {
 180         if (!cl->backend->request)
 181                 return -1;
 182
 183         return cl->backend->request(cl);
 184 }
 185
 186 int uclient_read(struct uclient *cl, char *buf, int len)
 187 {
 188         if (!cl->backend->read)
 189                 return -1;
 190
 191         return cl->backend->read(cl, buf, len);
 192 }
 193
 194 static void __uclient_backend_change_state(struct uloop_timeout *timeout)
 195 {
 196         struct uclient *cl = container_of(timeout, struct uclient, timeout);
 197
 198         if (cl->error_code && cl->cb->error)
 199                 cl->cb->error(cl, cl->error_code);
 200         else if (cl->eof && cl->cb->data_eof)
 201                 cl->cb->data_eof(cl);
 202 }
 203
 204 static void uclient_backend_change_state(struct uclient *cl)
 205 {
 206         cl->timeout.cb = __uclient_backend_change_state;
 207         uloop_timeout_set(&cl->timeout, 1);
 208 }
 209
 210 void __hidden uclient_backend_set_error(struct uclient *cl, int code)
 211 {
 212         if (cl->error_code)
 213                 return;
 214
 215         cl->error_code = code;
 216         uclient_backend_change_state(cl);
 217 }
 218
 219 void __hidden uclient_backend_set_eof(struct uclient *cl)
 220 {
 221         if (cl->eof || cl->error_code)
 222                 return;
 223
 224         cl->eof = true;
 225         uclient_backend_change_state(cl);
 226 }
 227
 228 void __hidden uclient_backend_reset_state(struct uclient *cl)
 229 {
 230         cl->eof = false;
 231         cl->error_code = 0;
 232         uloop_timeout_cancel(&cl->timeout);
 233 }