Tunneling in C (VPN)

/* all rights reserved */

#include <stdio.h>

#include <stdlib.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>

#include <string.h>

#include <arpa/inet.h>

#include <termios.h>

#include <termios.h>

#include <fcntl.h>

#include<iostream>

#include<stdio.h> // printf

#include<string.h> // strlen

#include<string> // string

#include<sys/socket.h> // socket

#include<arpa/inet.h> // inet_addr

#include<netdb.h> // hostenta

#include <unistd.h>

#include<iostream>

#include<sys/socket.h> // socket

#include<arpa/inet.h> // inet_addr

using namespace std;

struct sockaddr_in server;

#define BUFLEN 20

int len;

char str[80];

char buff[512];

int numBytesRecv;

unsigned char buf[BUFLEN + 1];

static struct termios tin;

struct con

{

char rec[512];

char c[512];

} conect;

int hostname_to_ip(char *hostname, char *ip)

{

struct hostent *he;

struct in_addr **addr_list;

int i;

if ((he = gethostbyname(hostname)) == NULL)

{

// get the host info

herror("gethostbyname");

return 1;

}

addr_list = (struct in_addr **)he->h_addr_list;

for (i = 0; addr_list[i] != NULL; i++)

{

// Return the first one;

strcpy(ip, inet_ntoa(*addr_list[i]));

return 0;

}

return 1;

}

int main(int argc, char *argv[])

{

char *hostname = argv[1];

char ip[100];

hostname_to_ip(hostname, ip);

printf("%s resolved to %s", hostname, ip);

int sock = socket(AF_INET, SOCK_STREAM, 0);

server.sin_family = AF_INET;

if (argc < 2)

{

printf("\nenter name host\r\nexemple wp.pl, o2.pl, facebook.pl");

scanf("%s", ip);

server.sin_addr.s_addr = inet_addr(ip);

}

else

{

server.sin_addr.s_addr = inet_addr(ip);

}

int port = 80;

if (argc == 3)

{

port = atoi(argv[2]);

}

printf("%s resolved to %s", hostname, ip);

server.sin_port = htons(port);

// conect true/false

connect(sock, (struct sockaddr *)&server, sizeof(server));

FILE *fp;

if ((fp = fopen("test2.html", "w")) == NULL)

{

printf("can't open file to write\n");

exit(1);

};

printf("port is: %d\n", port);

printf("host ip is %s\n", argv[1]);

printf("enter the , exemple:/index.aspx\n");

// get from keyboard page name

scanf("%s", str);

/* tunnelning in c */

sprintf(conect.c,

"CONNECT %s HTTP/1.1 \r\nHost: %s \r\nProxy-Connection: keep-alive \r\nUser-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36\r\n\r\n",

str, ip);

send(sock, conect.c, sizeof(conect.c) + 255, 0);

printf("sending request: %s\n", conect.c);

do

{

numBytesRecv = recv(sock, conect.rec, sizeof(conect.rec) + 255, 0);

printf("%s\n", conect.rec);

fprintf(fp, "%s\n", conect.rec);

fprintf(fp, "%s\n", conect.rec);

memset(&conect.rec, 0, sizeof(conect.rec));

printf("CONNECTED!!\r\n");

}

while (numBytesRecv > 0);

printf("save in test2.html file\n");

fclose(fp);

}