[英]C linux proxy server
我正在尝试构建客户端->代理服务器->服务器应用程序。
我需要代理服务器的帮助,我如何使它现在只能将数据发送到server
所以它只能与客户端通信。
这是我的编解码器或proxy server
,我通过示例对其进行了修改。 我是新来的。
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, pid;
socklen_t clilen;
struct sockaddr_in serv_addr, cli_addr;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
while (1) {
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error("ERROR on accept");
pid = fork();
if (pid < 0)
error("ERROR on fork");
if (pid == 0) {
close(sockfd);
dostuff(newsockfd);
exit(0);
}
else close(newsockfd);
} /* end of while */
close(sockfd);
return 0; /* we never get here */
}
/******** DOSTUFF() *********************
There is a separate instance of this function
for each connection. It handles all communication
once a connnection has been established.
*****************************************/
void dostuff (int sock)
{
int n, p;
char buffer[256];
char request;
FILE *file;
file = fopen("process.log","a+");
do
{
//here the proxy server receives data from the client
bzero(buffer,256);
p = read(sock,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("num: %s\n",buffer);
//here the proxy servers replies to the client.
n = write(sock,buffer,sizeof(buffer));
//here the process should send data to the server
//...codes i need help with...
if (n < 0) error("ERROR writing to socket");
fprintf(file,"%s\n",buffer); /*writes*/
}while(p != 0); //this runs the process +1 more than it should. wonder why?
fclose(file);
}
DoStuff()....您还可以检查我添加的注释。 另外,如何在客户端连接到服务器后立即向客户端发送消息,例如欢迎客户端消息? :)
注意:代理服务器将GET请求发送到HTTP 1.1服务器。
我真的很感激。 谢谢 :)
要连接到服务器,您将必须先调用socket
,然后再进行connect
以使该套接字从代理连接到您的真实服务器。 请参阅此处的第5节:
http://beej.us/guide/bgnet/output/html/singlepage/bgnet.html
另外,在DoStuff()
do-while循环中检查p
而不是n
4行。
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