find a random webserver using libcurl
Migrated from linuxjunk…
Compile with g++ code.cpp -lcurl -o randpages. Creates random IP addresses, then attempts to grab a page from http://IP using libcurl. Reports those that reply.
#include
#include
#include “stringify.h”
#include
#include
#include
using namespace std;
struct MemoryStruct {
char *memory;
size_t size;
};
static size_t
WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)data;
mem->memory = (char *) realloc(mem->memory, mem->size + realsize + 1);
if (mem->memory == NULL) {
/* out of memory! */
printf(“not enough memory (realloc returned NULL)\n”);
exit(EXIT_FAILURE);
}
memcpy(&(mem->memory[mem->size]), ptr, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
string fetch_url(string url,bool &fail) {
CURL *curl_handle;
struct MemoryStruct chunk;
chunk.memory =(char*) malloc(1); /* will be grown as needed by the realloc above */
chunk.size = 0; /* no data at this point */
curl_global_init(CURL_GLOBAL_ALL);
/* init the curl session */
curl_handle = curl_easy_init();
curl_easy_setopt(curl_handle, CURLOPT_CONNECTTIMEOUT, 3);
curl_easy_setopt(curl_handle, CURLOPT_TIMEOUT, 3);
/* specify URL to get */
curl_easy_setopt(curl_handle, CURLOPT_URL, url.c_str());
/* send all data to this function */
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
/* we pass our ‘chunk’ struct to the callback function */
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
/* some servers don’t like requests that are made without a user-agent
field, so we provide one */
curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, “libcurl-agent/1.0”);
/* get it! */
CURLcode res = curl_easy_perform(curl_handle);
fail = false;
if(res != 0) fail = true;
// if(doc.size() == 0) fail = true;
/* cleanup curl stuff */
curl_easy_cleanup(curl_handle);
/*
* Now, our chunk.memory points to a memory block that is chunk.size
* bytes big and contains the remote file.
*
* Do something nice with it!
*
* You should be aware of the fact that at this point we might have an
* allocated data block, and nothing has yet deallocated that data. So when
* you’re done with it, you should free() it as a nice application.
*/
//printf(“%lu bytes retrieved\n”, (long)chunk.size);
string s = chunk.memory;
if(chunk.memory)
free(chunk.memory);
/* we’re done with libcurl, so clean it up */
curl_global_cleanup();
return s;
}
string rand_ip() {
// anything but localhost please!
int top = 127;
for(;top==127;) top = rand()%256;
string s = stringify(top) + “.” + stringify(rand()%256) + “.” + stringify(rand()%256) + “.” + stringify(rand()%256);
return s;
}
string rand_url(bool &fail) {
string current_address;
bool no_address = true;
string ip = rand_ip();
current_address = “http://” + ip;
string doc = fetch_url(current_address,fail);
return ip;
}
int main(int argc,char **argv) {
size_t failed_connections = 0;
size_t valid_connections = 0;
if(argc < 1) cout << "randpages
for(;;) {
bool fail = true;
string url = rand_url(fail);
if(fail) { failed_connections++; } else { valid_connections++; }
if(!fail) cout << url << " " << valid_connections << " " << failed_connections << endl; } } [/sourcecode]
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