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864天前/* timeclnt.c - a client for timeserv.c |
* usage: timeclnt hostname portnumber |
*/ |
#include <stdio.h> |
#include <sys/types.h> |
#include <sys/socket.h> |
#include <netinet/in.h> |
#include <netdb.h> |
#define oops(msg) { perror(msg); exit(1); } |
main(int ac, char *av[]) |
{ |
struct sockaddr_in servadd; /* the number to call */ |
struct hostent *hp; /* used to get number */ |
int sock_id, sock_fd; /* the socket and fd */ |
char message[BUFSIZ]; /* to receive message */ |
int messlen; /* for message length */ |
/* |
* Step 1: Get a socket |
*/ |
sock_id = socket( AF_INET, SOCK_STREAM, 0 ); /* get a line */ |
if ( sock_id == -1 ) |
oops( "socket" ); /* or fail */ |
/* |
* Step 2: connect to server |
* need to build address (host,port) of server first |
*/ |
bzero( &servadd, sizeof( servadd ) ); /* zero the address */ |
hp = gethostbyname( av[1] ); /* lookup host's ip # */ |
if (hp == NULL) |
oops(av[1]); /* or die */ |
bcopy(hp->h_addr, (struct sockaddr *)&servadd.sin_addr, hp->h_length); |
servadd.sin_port = htons(atoi(av[2])); /* fill in port number */ |
servadd.sin_family = AF_INET ; /* fill in socket type */ |
/* now dial */ |
if ( connect(sock_id,(struct sockaddr *)&servadd, sizeof(servadd)) !=0) |
oops( "connect" ); |
/* |
* Step 3: transfer data from server, then hangup |
*/ |
messlen = read(sock_id, message, BUFSIZ); /* read stuff */ |
if ( messlen == - 1 ) |
oops("read") ; |
if ( write( 1, message, messlen ) != messlen ) /* and write to */ |
oops( "write" ); /* stdout */ |
close( sock_id ); |
} |
