tcp46www.c

LinuxNetProgramming Linux网络编程基础实例

  #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); 
}