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proxy.cc
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proxy.cc
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/******************************************
* HTTP Proxy
*
* File: proxy.cc
* Date: 29 Dec 2011
* Author: Xiaomou Wang
* Email: [email protected]
* Description: Description: This File contains the main funchtions of a HTTP Proxy.
*****************************************/
#include <string>
#include <pthread.h>
#include <iostream>
#include "header.h"
#include "create_server.h"
#include "Http_Request.h"
#include "LogUtils.h"
using namespace std;
void *handle_request(void *arg);
int send_request_to_remote(char *str, char* transfer) throw (int);
void read_and_send_back(int connfd, int transfer_sock, char *buffer);
char *get_ip(char *url, int connfd);
inline void check_method(status req_return, int connfd) throw (int);
// main function to receive request
// then create teh thread to deal
// with the reuqest.
int main(int argc, char *argv[]) {
if (argc < 2)
error("Invalid input");
int sockfd, n;
socklen_t len;
struct sockaddr_in server_addr;
sockfd = create_server(server_addr, argv[1], argc);
pthread_t tmp;
//wait for client requests.
while (true) {
try {
int *connfd = new int;
char * begin;
unsigned int name_length = 0;
struct sockaddr_in client_addr;
len = sizeof(client_addr);
//to get the next completed connection
//from the front of the completed connection queue.
*connfd = accept(sockfd, (struct sockaddr*) &client_addr, &len);
if (*connfd < 0)
error("Error in accept");
//create a thread to handle the request.
pthread_create(&tmp, NULL, &handle_request, (void *) connfd);
} catch (bad_alloc) {
printf("mem allocate fail\n");
}
}
return 0;
}
// This function will receive the request,
// analysis the request fix the request,
// transfer the request and receive the
// response.
// arg here will be the socket if between
// browser and proxy.
void *handle_request(void *arg) {
pthread_t threadNo = pthread_self();
pthread_detach(pthread_self());
log_d("wxiaomou", string("thead created No.") + to_string(threadNo)
+ string("\n"));
int connfd = *((int*) arg);
char* transfer, *url;
Http_Request req;
char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
try {
//read the message sent by the client.
read(connfd, buffer, BUFFER_SIZE);
//deal with the request.
status req_return = req.handle_request(buffer, url, transfer);
check_method(req_return, connfd);
char *str;
str = get_ip(url, connfd);
// transfer the request to remote server.
int transfer_sock = send_request_to_remote(str, transfer);
// Read data from server and send back to browser.
read_and_send_back(connfd, transfer_sock, buffer);
delete[] str;
delete[] url;
log_d("wxiaomou", string("Thread No ") + to_string(threadNo) + string(
" end"));
} catch (int value) {
log_d("wxiaomou", string("Thread No ") + to_string(threadNo) + string(
" terminated ") + to_string(value));
} catch (bad_alloc) {
log_d("wxiaomou", string("Thread No ") + to_string(threadNo) + string(
" terminated by bad_alloc"));
}
close(connfd);
}
// This function will transfer the requet
// from the browser to the server.
// Return the socket that connect the proxy
// and the remotw server.
// str is the ip address for the server.
// transfer the the http request.
int send_request_to_remote(char *str, char* transfer) throw (int) {
struct sockaddr_in orgin_addr;
int n = 0;
int portNo = 80;
//Build a socket.
int transfer_sock = socket(AF_INET, SOCK_STREAM, 0);
if (transfer_sock < 0)
error("Error opening socket");
//Initialize server_address.
bzero((char *) &orgin_addr, sizeof(orgin_addr));
orgin_addr.sin_family = AF_INET;
orgin_addr.sin_port = htons(portNo);
//Connect the client to the server.
if (inet_pton(AF_INET, str, &orgin_addr.sin_addr) != 1)
error("error in pton\n");
if (connect(transfer_sock, (sockaddr *) &orgin_addr, sizeof(orgin_addr))
< 0) {
log_d("wxiaomou", string("Error in connect"));
throw 1;
}
//send the text message to the server.
n = write1(transfer_sock, transfer, strlen(transfer));
if (n < 0)
throw 2;
return transfer_sock;
}
// read data from remote service and send back to browser.
// connfd is the socket id between proxy and browser.
// transfer_sock is the socket the connect to the remote
// server.
void read_and_send_back(int connfd, int transfer_sock, char *buffer) {
int n = 0;
bzero(buffer, BUFFER_SIZE);
while ((n = read1(transfer_sock, buffer, BUFFER_SIZE)) > 0) {
write1(connfd, buffer, n);
bzero(buffer, BUFFER_SIZE);
}
}
// Get the ip address.
// connfd is the socket id.
char *get_ip(char *url, int connfd) {
char *name = new char[strlen(url) + 1];
char *str = new char[INET_ADDRSTRLEN];
strcpy(name, url);
//printf("url is %s thread No %d\n", name, threadNo);
struct hostent *host_addr = get_ipaddr(name, connfd);
if (host_addr == NULL)
throw 0;
inet_ntop(host_addr->h_addrtype, host_addr->h_addr, str, INET_ADDRSTRLEN);
printf("ip is %s\n", str);
delete[] name;
return str;
}
// check if method other than 'GET'.
// req_return is the status that given from http_handle_request.
// connfd is the socket id.
inline void check_method(status req_return, int connfd) throw (int) {
if (req_return == method_not_found) {
char invalid[] = "HTTP/1.0 501 Not Implemented\r\n";
//send error message back.
if (write1(connfd, invalid, strlen(invalid)) < 0)
error("ERROR sending 501 response");
throw 3;
}
}