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| #include <netinet/in.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
int main(int argc, char **argv)
{
/* 构造查询包 */
const char quary[] =
"GET / HTTP/1.0\r\n"
"Host: blog.csdn.net\r\n"
"\r\n";
const char hostname[] = "blog.csdn.net";
struct sockaddr_in sin;
struct hostent *h;
const char *cp;
int fd;
ssize_t n_written, remaining;
char buf[1024];
/* 查找该域名的地址 */
h = gethostbyname(hostname);
if(h == NULL)
{
fprintf(stderr, "Couldn't lookup %s:%s\n", hostname, hstrerror(h_errno));
return 1;
}
if (h->h_addrtype != AF_INET)
{
fprintf(stderr, "No ipv6 support, sorry.\n");
return 1;
}
/* 创建一个套接字用来连接服务器 */
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0)
{
perror("socket");
return 1;
}
/* 连接到服务器 */
sin.sin_family = AF_INET;
sin.sin_port = htons(80);
sin.sin_addr = *(struct in_addr*)h->h_addr;
if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)))
{
perror("connect");
close(fd);
return 1;
}
/* 发送请求 */
cp = quary;
remaining = strlen(quary);
while(remaining)
{
n_written = send(fd,cp, remaining, 0);
if (n_written <= 0)
{
perror("send");
return 1;
}
remaining -= n_written;
cp += n_written;
}
/* 获取响应 */
while(1)
{
ssize_t result = recv(fd, buf, sizeof(buf), 0);
if (result == 0)
{
break;
}
else if (result < 0)
{
perror("recv\n");
close(fd);
return 1;
}
fwrite(buf, 1, result, stdout);
}
close(fd);
return 0;
}
|