socket 代理问题

antsmoving 2009-04-13 04:17:08

根据书上的代码写了个 TCP 的 client 代码可以和server简单通信
代码如下

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#define SERVERPORT 8888
#define MAXBUF 1024

int main(int argc, char* argv[])
{
int sockd;
int counter;
int fd;
struct sockaddr_in xferServer;
char buf[MAXBUF];
int returnStatus;

if (argc < 3)
{
fprintf(stderr, "Usage: %s <ip address> <filename> [dest filename]\n",
argv[0]);
exit(1);
}
/* create a socket */
sockd = socket(AF_INET, SOCK_STREAM, 0);
if (sockd == -1)
{
fprintf(stderr, "Could not create socket!\n");
exit(1);
}
/* set up the server information */
xferServer.sin_family = AF_INET;
xferServer.sin_addr.s_addr = inet_addr(argv[1]);
xferServer.sin_port = htons(SERVERPORT);
/* connect to the server */
returnStatus = connect(sockd,
(struct sockaddr*)&xferServer,
sizeof(xferServer));
if (returnStatus == -1)
{
fprintf(stderr, "Could not connect to server!\n");
exit(1);
}

/* send the name of the file we want to the server */
returnStatus = write(sockd, argv[2], strlen(argv[2])+1);
if (returnStatus == -1)
{
fprintf(stderr, "Could not send filename to server!\n");
exit(1);
}

/* call shutdown to set our socket to read-only */
shutdown(sockd, SHUT_WR);

/* open up a handle to our destination file to receive the contents */
/* from the server */
fd = open(argv[3], O_WRONLY | O_CREAT | O_APPEND);
if (fd == -1)
{
fprintf(stderr, "Could not open destination file, using stdout.\n");
fd = 1;
}

/* read the file from the socket as long as there is data */
int i = 0;
while ((counter = read(sockd, buf, MAXBUF)) > 0)
{
/* send the contents to stdout */
fprintf(stdout, "write for the %d time \n", ++i);
write(fd, buf, counter);
}
if (counter == -1)
{
fprintf(stderr, "Could not read file from socket!\n");
exit(1);
}
close(sockd);
return 0;
}

客户端给出服务器地址和端口以及服务器段的一个文件名发出后服务器返回文件内容

现在我想添加代理功能，改成客户端通过代理发送网页请求读取指定网页的页面内容

代码应该如何修改，查了网上的说法，要添加 http协议内容，请具体指点谢谢

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