Client

int sock_connect(char *domain,int port)

{

int white_sock;

struct hostent * site;

struct sockaddr_in me;

site = gethostbyname(domain);

if (site==NULL) return -2;

white_sock = socket(AF_INET,SOCK_STREAM,0);

if (white_sock<0) return -1;

memset(&me,0,sizeof(struct sockaddr_in));

memcpy(&me.sin_addr,site->h_addr_list[0],site->h_length);

me.sin_family = AF_INET;

me.sin_port = htons(port);

return (connect(white_sock,(struct sockaddr *)&me,sizeof(struct

sockaddr))<0) ? -1 : white_sock;

}

gethostbyname()

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netdb.h>

int htconnect(char *domain,int port)

{

int white_sock;

struct hostent * site;

struct sockaddr_in me;

site = gethostbyname(domain);

if (site==NULL) return -2;

white_sock = socket(AF_INET,SOCK_STREAM,0);

if (white_sock<0) return -1;

memset(&me,0,sizeof(struct sockaddr_in));

memcpy(&me.sin_addr,site->h_addr_list[0],site->h_length);

me.sin_family = AF_INET;

me.sin_port = htons(port);

return (connect(white_sock,(struct sockaddr *)&me,sizeof(struct

sockaddr))<0) ? -1 : white_sock;

}

int htsend(int sock,char *fmt,...)

{

char BUF[1024];

va_list argptr;

va_start(argptr,fmt);

vsprintf(BUF,fmt,argptr);

va_end(argptr);

return send(sock,BUF,strlen(BUF),0);

}

void main(int argc,char **argv)

{

int black_sock;

char bugs_bunny[3];

if (argc<2) return;

black_sock = htconnect(argv[1],80);

if (black_sock<0) return;

htsend(black_sock,"GET / HTTP/1.0%c",10);

htsend(black_sock,"Host: %s%c",argv[1],10);

htsend(black_sock,"%c",10);

while (read(black_sock,bugs_bunny,1)>0)

printf("%c",bugs_bunny[0]); }

close(black_sock);

}

gcc -o ex1 client.c

./ex1 www.linux.org.tw

Server

Listen to a port

int DaemonSocket;

struct sockaddr_in DaemonAddr;

int BindSocket(void)

{

DaemonSocket = socket(AF_INET,SOCK_STREAM,0);

if (DaemonSocket==-1) return 0;

DaemonAddr.sin_family = AF_INET;

DaemonAddr.sin_port = htons(DAEMON_PORT);

if (bind(DaemonSocket,&DaemonAddr,sizeof(DaemonAddr))<0) {

printf("Can not bind!\n");

return 0;

}

if (listen(DaemonSocket,1024)!=0) {

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