#
include
#include
#include
<
string
.h>
#include
#include
socket
.h>
#include
<
errno
.h>
#include
#include
#include
#include
#include
#include
<
ctype
.h>
int main(
int argc,
char
*argv)
portnumber=80;
strcpy
(host_addr,argv[1]);
if((host=
gethostbyname
(argv[1]))
==null
)/*取得主機ip位址*/if(
(sockfd=
socket
(af_inet
,sock_stream
,0))==
-1)/*建立socket連線*/
/* 客戶程式填充服務端的資料 */
bzero(
&server_addr,
sizeof
(server_addr));
server_addr.sin_family=
af_inet
;server_addr.sin_port=
htons
(portnumber)
;server_addr.sin_addr=*(
(struct
in_addr
*)host-
>h_addr)
;/* 客戶程式發起連線請求 */if(
connect
(sockfd,
(struct
sockaddr*)
(&server_addr)
,sizeof
(struct
sockaddr))
==-1)/*連線***/
;/*準備request，將要傳送給主機*/
/*取得真實的檔名*/
strcpy
(local_file,
"index.html");
/*傳送http請求request*/
send
= 0;totalsend = 0;
nbytes=
strlen
(request)
;while
(totalsend < nbytes)
totalsend+
=send
;printf
("%d bytes send ok!\n"
, totalsend);}
fp =
fopen
(local_file,
"a");if
(!fp)
printf
("\nthe following is the response header:\n");
i=0;
/* 連線成功了，接收http響應，response */
while
((nbytes=
read
(sockfd,buffer,1))=
=1)else
}fclose
(fp)
;/* 結束通訊 */
close
(sockfd)
;exit
(0);}
1 struct hostent *gethostbyname(const char *name);
struct hostent ;
#define h_addr h_addr_list[0] /*在h-addr-list中的第乙個位址*/
我們一般用的也就第乙個位址
struct sockaddr_in ;
這裡也提下 struct sockaddr
這個是描述sock 位址資訊的，和上面的結構大小一樣，可以相互轉換
struct sockaddr
3 我們和伺服器連上之後，就可以向伺服器傳送請求了
write(sockfd, char *, size);
內容就是：get /%s http/1.1\r\naccept: */*\r\naccept-language: zh-cn\r\n\user-agent: mozilla/4.0 (compatible; msie 5.01; windows nt 5.0)\r\n\
host: %s:%d\r\nconnection: close\r\n\r\n
具體是由其協議定的，我也還不是很清楚
4 伺服器響應，就會發來資訊頭+ 實際頁面的資訊， 這個中間是有4個（"\r"或"\n"）進行分開的。
Linux下http協議實現
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