c++写一个代理服务器
时间: 2024-04-29 07:25:20 浏览: 23
好的,以下是一个简单的代理服务器代码示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#define BUF_SIZE 1024
void error_handling(char *message);
int main(int argc, char *argv[]) {
if (argc != 2) {
printf("Usage: %s <port>\n", argv[0]);
exit(1);
}
int serv_sock, clnt_sock;
struct sockaddr_in serv_addr, clnt_addr;
socklen_t clnt_addr_size;
char buffer[BUF_SIZE];
int read_cnt;
serv_sock = socket(PF_INET, SOCK_STREAM, 0);
if (serv_sock == -1) {
error_handling("socket() error");
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(atoi(argv[1]));
if (bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) == -1) {
error_handling("bind() error");
}
if (listen(serv_sock, 5) == -1) {
error_handling("listen() error");
}
clnt_addr_size = sizeof(clnt_addr);
while (1) {
clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
if (clnt_sock == -1) {
error_handling("accept() error");
}
while ((read_cnt = read(clnt_sock, buffer, BUF_SIZE)) != 0) {
printf("Received message from client: %s", buffer);
write(clnt_sock, buffer, read_cnt);
}
close(clnt_sock);
}
close(serv_sock);
return 0;
}
void error_handling(char *message) {
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
```
这段代码实现了一个简单的代理服务器,它会监听指定的端口,接收来自客户端的连接,然后将客户端发送过来的数据原封不动地转发给目标服务器,同时将目标服务器的响应原封不动地返回给客户端。