src/curl/resolve.c

   1 /* libquvi
   2  * Copyright (C) 2012  Toni Gundogdu <legatvs@gmail.com>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301  USA
  18  */
  19
  20 #include "config.h"
  21
  22 #include <curl/curl.h>
  23 #include <glib.h>
  24
  25 #include "quvi.h"
  26 /* -- */
  27 #include "_quvi_s.h"
  28 #include "_quvi_net_resolve_s.h"
  29 /* -- */
  30 #include "curl/autoproxy.h"
  31
  32 /* Set cURL options. */
  33 static void _set_opts(_quvi_net_resolve_t r, CURL *c)
  34 {
  35   curl_easy_setopt(c, CURLOPT_URL, r->url.addr->str);
  36   /* Use HEAD request: we're only interested in the header metadata. */
  37   curl_easy_setopt(c, CURLOPT_NOBODY, 1L); /* GET -> HEAD. */
  38
  39   c_autoproxy(r->handle.quvi, r->url.addr->str);
  40 }
  41
  42 static void _reset_opts(CURL *c)
  43 {
  44   curl_easy_setopt(c, CURLOPT_HTTPGET, 1L); /* HEAD -> GET. */
  45 }
  46
  47 /* Check whether the server returned a redirection URL. */
  48 static QuviError _chk_redir(_quvi_net_resolve_t r, CURL *c)
  49 {
  50   CURLcode curlcode;
  51   QuviError rc;
  52
  53   curlcode = curl_easy_perform(c);
  54   curl_easy_getinfo(c, CURLINFO_RESPONSE_CODE, &r->status.resp_code);
  55
  56   rc = QUVI_OK;
  57
  58   if (curlcode == CURLE_OK && r->status.resp_code == 200)
  59     {
  60       gchar *u = NULL;
  61       curl_easy_getinfo(c, CURLINFO_EFFECTIVE_URL, &u);
  62       /* Leave comparison for resolve_redirections.lua */
  63       g_string_assign(r->url.dst, u);
  64     }
  65   else
  66     {
  67       if (curlcode == CURLE_OK)
  68         {
  69 #define _EOK "server responded with code %03ld"
  70           g_string_printf(r->status.errmsg, _EOK, r->status.resp_code);
  71 #undef _EOK
  72         }
  73       else
  74         {
  75           const gchar *s = curl_easy_strerror(curlcode);
  76           const glong c = r->status.resp_code;
  77           const gint cc = curlcode;
  78 #define _ENO "%s (HTTP/%03ld, cURL=0x%03x)"
  79           g_string_printf(r->status.errmsg, _ENO, s, c, cc);
  80 #undef _ENO
  81         }
  82       rc = QUVI_ERROR_CALLBACK;
  83     }
  84   return (rc);
  85 }
  86
  87 /* Resolve an URL redirection if needed. */
  88 QuviError c_resolve(_quvi_t q, _quvi_net_resolve_t r)
  89 {
  90   QuviError rc;
  91   CURL *c;
  92
  93   c = q->handle.curl;
  94
  95   _set_opts(r, c);
  96   rc = _chk_redir(r, c);
  97   _reset_opts(c);
  98
  99   return (rc);
 100 }
 101
 102 /* vim: set ts=2 sw=2 tw=72 expandtab: */