funcs/func_curl.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C)  2004 - 2006, Tilghman Lesher
   5  *
   6  * Tilghman Lesher <curl-20050919@the-tilghman.com>
   7  * and Brian Wilkins <bwilkins@cfl.rr.com> (Added POST option)
   8  *
   9  * app_curl.c is distributed with no restrictions on usage or
  10  * redistribution.
  11  *
  12  * See http://www.asterisk.org for more information about
  13  * the Asterisk project. Please do not directly contact
  14  * any of the maintainers of this project for assistance;
  15  * the project provides a web site, mailing lists and IRC
  16  * channels for your use.
  17  *
  18  */
  19
  20 /*! \file
  21  *
  22  * \brief Curl - Load a URL
  23  *
  24  * \author Tilghman Lesher <curl-20050919@the-tilghman.com>
  25  *
  26  * \note Brian Wilkins <bwilkins@cfl.rr.com> (Added POST option)
  27  *
  28  * \ingroup functions
  29  */
  30
  31 /*** MODULEINFO
  32         <depend>curl</depend>
  33  ***/
  34
  35 #include "asterisk.h"
  36
  37 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <curl/curl.h>
  43
  44 #include "asterisk/lock.h"
  45 #include "asterisk/file.h"
  46 #include "asterisk/logger.h"
  47 #include "asterisk/channel.h"
  48 #include "asterisk/pbx.h"
  49 #include "asterisk/cli.h"
  50 #include "asterisk/options.h"
  51 #include "asterisk/module.h"
  52 #include "asterisk/app.h"
  53 #include "asterisk/utils.h"
  54
  55 struct MemoryStruct {
  56         char *memory;
  57         size_t size;
  58 };
  59
  60
  61 static void *myrealloc(void *ptr, size_t size)
  62 {
  63         /* There might be a realloc() out there that doesn't like reallocing
  64            NULL pointers, so we take care of it here */
  65         if (ptr)
  66                 return ast_realloc(ptr, size);
  67         else
  68                 return ast_malloc(size);
  69 }
  70
  71 static size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
  72 {
  73         register int realsize = size * nmemb;
  74         struct MemoryStruct *mem = (struct MemoryStruct *)data;
  75
  76         mem->memory = (char *)myrealloc(mem->memory, mem->size + realsize + 1);
  77         if (mem->memory) {
  78                 memcpy(&(mem->memory[mem->size]), ptr, realsize);
  79                 mem->size += realsize;
  80                 mem->memory[mem->size] = 0;
  81         }
  82         return realsize;
  83 }
  84
  85 static int curl_internal(struct MemoryStruct *chunk, char *url, char *post)
  86 {
  87         CURL *curl;
  88
  89         curl = curl_easy_init();
  90
  91         if (!curl) {
  92                 return -1;
  93         }
  94
  95         curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);
  96         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 180);
  97         curl_easy_setopt(curl, CURLOPT_FRESH_CONNECT, 1);
  98         curl_easy_setopt(curl, CURLOPT_FORBID_REUSE, 1);
  99         curl_easy_setopt(curl, CURLOPT_URL, url);
 100         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
 101         curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)chunk);
 102         curl_easy_setopt(curl, CURLOPT_USERAGENT, "asterisk-libcurl-agent/1.0");
 103
 104         if (post) {
 105                 curl_easy_setopt(curl, CURLOPT_POST, 1);
 106                 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post);
 107         }
 108
 109         curl_easy_perform(curl);
 110         curl_easy_cleanup(curl);
 111         return 0;
 112 }
 113
 114 static int acf_curl_exec(struct ast_channel *chan, char *cmd, char *info, char *buf, size_t len)
 115 {
 116         struct ast_module_user *u;
 117         struct MemoryStruct chunk = { NULL, 0 };
 118         AST_DECLARE_APP_ARGS(args,
 119                 AST_APP_ARG(url);
 120                 AST_APP_ARG(postdata);
 121         );
 122
 123         *buf = '\0';
 124
 125         if (ast_strlen_zero(info)) {
 126                 ast_log(LOG_WARNING, "CURL requires an argument (URL)\n");
 127                 return -1;
 128         }
 129
 130         u = ast_module_user_add(chan);
 131
 132         AST_STANDARD_APP_ARGS(args, info);
 133
 134         if (!curl_internal(&chunk, args.url, args.postdata)) {
 135                 if (chunk.memory) {
 136                         chunk.memory[chunk.size] = '\0';
 137                         if (chunk.memory[chunk.size - 1] == 10)
 138                                 chunk.memory[chunk.size - 1] = '\0';
 139
 140                         ast_copy_string(buf, chunk.memory, len);
 141                         free(chunk.memory);
 142                 }
 143         } else {
 144                 ast_log(LOG_ERROR, "Cannot allocate curl structure\n");
 145         }
 146
 147         ast_module_user_remove(u);
 148
 149         return 0;
 150 }
 151
 152 struct ast_custom_function acf_curl = {
 153         .name = "CURL",
 154         .synopsis = "Retrieves the contents of a URL",
 155         .syntax = "CURL(url[|post-data])",
 156         .desc =
 157         "  url       - URL to retrieve\n"
 158         "  post-data - Optional data to send as a POST (GET is default action)\n",
 159         .read = acf_curl_exec,
 160 };
 161
 162 static int unload_module(void)
 163 {
 164         int res;
 165
 166         res = ast_custom_function_unregister(&acf_curl);
 167
 168         ast_module_user_hangup_all();
 169
 170         curl_global_cleanup();
 171
 172         return res;
 173 }
 174
 175 static int load_module(void)
 176 {
 177         int res;
 178
 179         if (curl_global_init(CURL_GLOBAL_ALL)) {
 180                 ast_log(LOG_ERROR, "Unable to initialize the CURL library. Cannot load func_curl\n");
 181                 return AST_MODULE_LOAD_DECLINE;
 182         }
 183
 184         res = ast_custom_function_register(&acf_curl);
 185
 186         return res;
 187 }
 188
 189 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Load external URL");
 190