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Firefox

IE. Firefox. Persistent connections. HTTP/1.1 傳完之後不會自動斷線。 HTTP/1.0 才會自動斷線。. TCP Client-Server Interaction. TCP Server. socket(). bind(). TCP Client. listen(). socket(). accept(). connection establishment. connect(). data request. read()/recv(). write()/send(). data reply.

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Firefox

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  1. IE

  2. Firefox

  3. Persistent connections • HTTP/1.1 傳完之後不會自動斷線。 • HTTP/1.0 才會自動斷線。

  4. TCP Client-Server Interaction TCP Server socket() bind() TCP Client listen() socket() accept() connection establishment connect() data request read()/recv() write()/send() data reply write()/send() read()/recv() end-of-file notification read() close() close() from UNIX Network Programming Volume 1, figure 4.1

  5. Include Headers • #include <sys/socket.h> • #include <netinet/in.h> • #include <unistd.h> • #include <netdb.h>

  6. Create a socket // declare a socket file descriptor int listenfd; listenfd = socket( AF_INET, SOCK_STREAM, 0 );

  7. Bind a socket to an address // declare a int for bind()’s result int bindres; // declare a structure for address struct sockaddr_in proxyaddr; // initialize the structure memset(&proxyaddr, 0, sizeof(proxyaddr)); proxyaddr.sin_family = AF_INET; proxyaddr.sin_addr.s_addr = htonl( INADDR_ANY ); proxyaddr.sin_port = htons( 3128 ); //bind listenfd to bindres = bind( listenfd, (struct sockaddr *)&proxyaddr, sizeof( proxyaddr ));

  8. Listen to the socket & Accept when someone connect listen( listenfd, 5000 ); while(1) { connfd = accept( listenfd, (struct sockaddr *)NULL, NULL ); // do things like read and write with connfd doit(); close(connfd); } close(listenfd);

  9. What we have to do doit() { // 1. read request from the client // 2. parse request // 3. build another connection to the server // 4. send request to the server // 5. read response from the server // 6. close connection with the server // 7. parse response // 8. send response to the client }

  10. How to read? • Use read() • read( fd, buf, strlen( buf ) ); • Use recv() • recv( fd, buf, strlen( buf ), 0 ); int fd = socket(…); char buf[1024]; or char *buf;

  11. How to write? • Use write() • write( fd, buf, strlen( buf ) ); • Use send() • send( fd, buf, strlen( buf ), 0 ); int fd = socket(…); char buf[1024]; or char *buf;

  12. How to connect to the server? int servfd = socket(…); connect( servfd, ( struct sockaddr * ) &servaddr, sizeof( servaddr ) );

  13. HTTP Request GEThttp://network2006.csie.org/index.htmlHTTP/1.0 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* Accept-Language: zh-tw User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; (R1 1.3); .NET CLR 1.1.4322) Host: network2006.csie.org Proxy-Connection: Keep-Alive

  14. HTTP Response HTTP/1.0200 OK Connection: close Content-Type: text/html ETag: "-376597886" Accept-Ranges: bytes Last-Modified: Fri, 17 Mar 2006 12:23:08 GMT Content-Length: 80 Date: Wed, 22 Mar 2006 16:42:47 GMT Server: lighttpd/1.4.10 Body …………………….

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