A Tiny (Windows) Sockets Client

© Copyright 1997 University of New Haven

 
#ifndef unix
#define WIN32
#include <windows.h>
#include <winsock.h>
#else
#define closesocket close
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#endif
 
#include <stdio.h>
#include <string.h>
 
main()
{
#ifdef _MSC_VER
#define MSVCFAR far
#else
#define MSVCFAR
#endif
 
 struct hostent MSVCFAR *serverip; /* pointer to a host table entry */
 struct sockaddr_in server; /* structure to hold an IP address */
 int sd; /* socket descriptor */
 char buf[1000]; /* buffer for data from the server */
 int n;
 
#ifdef WIN32
 WSADATA wsaData;
 WSAStartup(0x0101, &wsaData);
#endif
 
 
 memset((char *)&server,0,sizeof(server)); /* clear sockaddr structure */
 server.sin_family = AF_INET; /* set family to Internet */
 
 /* Convert host name to equivalent IP address and copy to sockaddr. */
 
 serverip = gethostbyname("charger.newhaven.edu");
 
 /* or when connecting to a computer identified by IP number: */
 /* {  */
 /* long ipaddr = inet_addr("204.60.72.11"); */
 /* serverip = gethostbyaddr(&ipaddr, 4, PF_INET); */
 /* } */
 
 if ( !serverip ) {
  fprintf(stderr,"invalid host\n");
 exit(1);
 }
 
#ifdef _MSC_VER
 _fmemcpy(&server.sin_addr, serverip->h_addr, serverip->h_length);
#else
 memcpy(&server.sin_addr, serverip->h_addr, serverip->h_length);
#endif 
 
#define DAYTIMEPORT 13
 server.sin_port= htons(DAYTIMEPORT);
 
 /* Create a socket. */
 
 sd = socket(PF_INET, SOCK_STREAM, 0);
 if (sd < 0) {
 fprintf(stderr, "socket creation failed\n");
  exit(1);
 }
 
 
 /* Connect the socket to the specified server. */
 
 if (connect(sd, (struct sockaddr *)&server, sizeof(server)) < 0) {
 fprintf(stderr,"connect failed\n");
 exit(1);
 }
 
  /* Repeatedly read data from socket and write to user's screen. */
 
 n = recv(sd, buf, sizeof(buf), 0);
 while (n > 0) {
 write(1,buf,n);
 n = recv(sd, buf, sizeof(buf), 0);
 }
 
 /* Close the socket. */
 
 closesocket(sd);
 
 /* Terminate the client program gracefully. */
 
#ifdef WIN32
 WSACleanup();
#endif
 exit(0);
}

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