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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Curl - App to load a URL
*
* Copyright (C) 2004, Tilghman Lesher
*
* Tilghman Lesher <curl-20041222@the-tilghman.com>
* and Brian Wilkins <bwilkins@cfl.rr.com> (Added POST option)
*
* app_curl.c is distributed with no restrictions on usage or
* redistribution.
*/
#include <asterisk/lock.h>
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/cli.h>
#include <asterisk/options.h>
#include <asterisk/module.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
static char *tdesc = "Load external URL";
static char *app = "Curl";
static char *synopsis = "Load an external URL";
static char *descrip =
" Curl(URL[|postdata]): Requests the URL. Mainly used for signalling\n"
"external applications of an event. Returns 0 or -1 on fatal error.\n"
"Argument specified treated as POST data. Also sets CURL variable with the\n"
"resulting page.\n";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
extern int errno;
struct MemoryStruct {
char *memory;
size_t size;
};
static void *myrealloc(void *ptr, size_t size)
{
/* There might be a realloc() out there that doesn't like reallocing
NULL pointers, so we take care of it here */
if (ptr)
return realloc(ptr, size);
else
return malloc(size);
}
static size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
register int realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)data;
mem->memory = (char *)myrealloc(mem->memory, mem->size + realsize + 1);
if (mem->memory) {
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
}
return realsize;
}
static int curl_exec(struct ast_channel *chan, void *data)
{
int res = 0;
struct localuser *u;
CURL *curl;
char *info, *post_data=NULL, *url;
if (!data || !strlen((char *)data)) {
ast_log(LOG_WARNING, "Curl requires an argument (URL)\n");
return -1;
}
if ((info = ast_strdupa((char *)data))) {
url = strsep(&info, "|");
post_data = info;
} else {
ast_log(LOG_ERROR, "Out of memory\n");
return -1;
}
LOCAL_USER_ADD(u);
curl_global_init(CURL_GLOBAL_ALL);
curl = curl_easy_init();
if (curl) {
struct MemoryStruct chunk;
chunk.memory=NULL; /* we expect realloc(NULL, size) to work */
chunk.size = 0; /* no data at this point */
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
curl_easy_setopt(curl, CURLOPT_USERAGENT, "asterisk-libcurl-agent/1.0");
if (post_data) {
curl_easy_setopt(curl, CURLOPT_POST, 1);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_data);
}
curl_easy_perform(curl);
curl_easy_cleanup(curl);
chunk.memory[chunk.size] = '\0';
if (chunk.memory[chunk.size - 1] == 10)
chunk.memory[chunk.size - 1] = '\0';
pbx_builtin_setvar_helper(chan, "CURL", chunk.memory);
free(chunk.memory);
} else {
ast_log(LOG_ERROR, "Cannot allocate curl structure\n");
res = -1;
}
LOCAL_USER_REMOVE(u);
return res;
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
return ast_unregister_application(app);
}
int load_module(void)
{
return ast_register_application(app, curl_exec, synopsis, descrip);
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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