C language simulating web post data submission

# Include <pthread. h> <br/> # include <string. h> </P> <p> # include <sys/socket. h> <br/> # include <stdio. h> <br/> # include <errno. h> <br/> # include <stdlib. h> <br/> # include <unistd. h> <br/> # include <sys/types. h> <br/> # include <sys/socket. h> <br/> # include <netinet/in. h> <br/> # include <netdb. h> </P> <p> # define server "www.su.zju.edu.cn" <br/> # Define Port 80 <br/> # define thread_num 5 </P> <p> pthread_mutex_t sock_mu Tex; <br/> pthread_cond_t sock_cond; </P> <p> char * gen_request () <br/>{< br/> char * text = (char *) malloc (sizeof (char) * 2048); </P> <p> memset (text, 0, sizeof (char) * 2048 ); </P> <p>/* Text packet get from Wireshark */<br/> strcat (text, "post/hack/vote. PHP? Type = 2 HTTP/1.1/R/N "); <br/> strcat (text," Host: [url] www.su.zju.edu.cn [/url]/R/N "); <br/> strcat (text, "User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; RV: 1.8.1.3) gecko/20061201 Firefox/2.0.0.3 (Ubuntu-Feisty)/R/N "); <br/> strcat (text," accept: text/XML, application/XML, application/XHTML + XML, text/html; q = 0.9, text/plain; q = 0.8, image/PNG, */*; q = 0.5/R/N "); <br/> strcat (text, "Accept-language: ZH-CN, Zh; q = 0.5/R/N "); <br/> strcat (text," Accept-encoding: gzip, deflate/R/N "); <br/> strcat (text, "Accept-charset: gb2312, UTF-8; q = 0.7, *; q = 0.7/R/N "); <br/> strcat (text, "keep-alive: 300/R/N"); <br/> strcat (text, "connection: keep-alive/R/N "); <br/> strcat (text," Referer: [url] http://www.su.zju.edu.cn/#/url#/r/n "); <br/> strcat (text," Cookie: usrtime = 1178023651; lasturl = http % 3A % 2f % 2fwww.su.zju.edu.cn % 2fha CK % 2fvisit. PHP % 3 FTYPE % 3d1; loginurl = http % 3A % 2f % 2fwww.su.zju.edu.cn % 2 fhack % 2fvote. PHP % 3 FTYPE % 3d2; usrsid = random; usripfrom = unknow; usrtime = 1178023650; lasturl = http % 3A % 2f % 2fwww.su.zju.edu.cn % 2f/R/N "); <br/> strcat (text, "Content-Type: Application/X-WWW-form-urlencoded/R/N"); <br/> strcat (text, "Content-Length: 10/R/N"); <br/> strcat (text, "/R/N"); <br/> strcat (text, "voteid = 276 "); </P> <p> return text; <br/>}</P> <p> void * sock_thread (void * Data) <br/>{< br/> while (1) <br/>{< br/>/* wait to start vote */<br/> pthread_mutex_lock (& sock_mutex ); <br/> pthread_cond_wait (& sock_cond, & sock_mutex); <br/> pthread_mutex_unlock (& sock_mutex); </P> <p> struct hostent * hostinfo; <br/> struct sockaddr_in name; </P> <p> name. sin_family = af_inet; <br/> name. sin_port = htons (port); <br/> Hostinfo = gethostbyname (server); </P> <p> If (hostinfo = NULL) <br/> continue; <br/> name. sin_addr = * (struct in_addr *) hostinfo-> h_addr; <br/> int sock = socket (pf_inet, sock_stream, 0); <br/> If (sock <0) <br/> continue; </P> <p>/* connect to the server */<br/> If (connect (sock, (struct sockaddr *) & name, sizeof (name) <0) <br/> continue; <br/> char * text = gen_request (); </P> <p>/* Send it !!! */<Br/> write (sock, text, strlen (text) + 1); <br/> memset (text, 0, sizeof (char) * 2048 ); <br/> free (text); </P> <p>/* well... better receive it */<br/> text = (char *) malloc (sizeof (char) * 1024); <br/> while (1) <br/>{< br/> int nbyte = Recv (sock, text, 1024, 0); <br/> If (nbyte <1024) <br/> break; <br/>}< br/> free (text); </P> <p>/* close the connection */<br/> close (sock ); <br/>}</P> <p> int main (INT argc, char * argv []) <br/> {<br/>/* initialize */<br/> pthread_t * arr_pid = (pthread_t *) malloc (sizeof (pthread_t) * thread_num ); <br/> pthread_mutex_init (& sock_mutex, null); <br/> pthread_cond_init (& sock_cond, null ); </P> <p>/* create all the thread */<br/> int I; <br/> for (I = 0; I <thread_num; I ++) <br/> pthread_create (& arr_pid [I], null, sock_thread, null); <br/> while (1) <br/>{< br/>/* sleep for a while to let one of the thread to go */<br/> usleep (200 ); <br/> pthread_cond_signal (& sock_cond ); <br/>}</P> <p>/* clean up all the threads */<br/> for (I = 0; I <thread_num; I ++) <br/> pthread_join (arr_pid [I], null); </P> <p> return 0; <br/>}