http服务器下载文件

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
//#include "tcp.h"

#define DEFAULT_PORT 80

int main( int argc, char ** argv )
{
char *p = NULL;
char path[1024];
char hostname[100];
char *purl = argv[1];
char request[200];
char recv_buf[1400];
int recv_count;
int sock_fd;
int ret;
int iLoop = 0;
struct hostent *host;
struct sockaddr_in server_addr;

if(argc != 2) {
printf("Usage: %s URL\n", argv[0]);
exit(1);
}

p = strchr(purl, ':');        /* http://www.baidu.com/filename.txt */
p = strchr(p + 3, '/');      /* https://www.baidu.com/filename.txt */
strcpy(path, p);
*p = '\0';
printf("---path: %s---\n", path);

p = strchr(purl, ':');      /* https://www.baidu.com/filename.txt */
strcpy(hostname, p + 3);
printf("---hostname: %s---\n", hostname);

printf("正在进行域名解析: %s...\n", hostname);
host = gethostbyname(hostname);
if(host == NULL) {
perror("gethostbyname");
exit(1);
}

sock_fd = socket(AF_INET, SOCK_STREAM, 0);
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(DEFAULT_PORT);
memcpy(&server_addr.sin_addr, host->h_addr, sizeof(int));

printf("正在连接服务器: %s...\n", hostname);
ret = connect(sock_fd, (struct sockaddr *)&server_addr, sizeof(struct sockaddr_in));
if(ret == -1) {
perror("connect");
exit(2);
}

sprintf(request, "GET %s HTTP/1.1\r\nHost: %s: %d\r\nRange: bytes=0-\r\n\r\n", path, hostname, DEFAULT_PORT);
//sprintf(request, "GET %s HTTP/1.1\r\nHost: %s: %d\r\nRange: bytes=1-\r\n\r\n", path, hostname, DEFAULT_PORT);
//sprintf(request, "GET %s HTTP/1.1\r\nHost: %s: %d\r\nRange: bytes=2-\r\n\r\n", path, hostname, DEFAULT_PORT);
//sprintf(request, "HEAD %s HTTP/1.1\r\nHost: %s: %d\r\nRange: bytes=1-\r\n\r\n", path, hostname, DEFAULT_PORT);

printf("正在发送下载请求...\n");
send(sock_fd, request, strlen(request)+1, 0);
printf("正在接受服务器数据...\n");

while(1) {
iLoop++;
bzero(recv_buf, sizeof(recv_buf));
recv_count = recv(sock_fd, recv_buf, sizeof(recv_buf) - 1, 0);
if((recv_count == 0) /* || (recv_count < sizeof(recv_buf) - 1) */) {
//printf("接受完毕(iLoop = %d).\n", iLoop);
printf("接受完毕(recv_count = %d).\n", iLoop);
break;
}
printf("%s", recv_buf);
//write(write_fd, recv_buf, recv_count);
}

close(sock_fd);
return 0;
}