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/************************************************************************\
* INET_WSTREAM.C *
* Test of TCP/IP. Invoke as *
* inet_wstream hostname portnumber *
* in order to send a fragment of an obnoxious Dijkstra quote to a *
* process assumed to be reading from a stream at the specified *
* address. *
* *
* Phil Kearns *
* April 11, 1987 *
* *
* Modified February 2009 to use getaddrinfo() *
\************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
char msg[] = { "false pearls before real swine" };
int main(argc, argv)
int argc;
char **argv;
{
int sock, left, num, put, ecode;
struct sockaddr_in *server;
struct addrinfo hints, *addrlist;
if (argc != 3) {
fprintf(stderr,"inet_wstream:usage is inet_wstream host port\n");
exit(1);
}
/*
Want a sockaddr_in containing the ip address for the system
specified in argv[1] and the port specified in argv[2].
*/
memset( &hints, 0, sizeof(hints));
hints.ai_family = AF_INET; hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICSERV; hints.ai_protocol = 0;
hints.ai_canonname = NULL; hints.ai_addr = NULL;
hints.ai_next = NULL;
ecode = getaddrinfo(argv[1], argv[2], &hints, &addrlist);
if (ecode != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ecode));
exit(1);
}
server = (struct sockaddr_in *) addrlist->ai_addr;
/*
Create the socket.
*/
if ( (sock = socket( addrlist->ai_family, addrlist->ai_socktype, 0 )) < 0 ) {
perror("inet_wstream:socket");
exit(1);
}
/*
Connect to data socket on the peer at the specified Internet
address.
*/
if ( connect(sock, (struct sockaddr *)server, sizeof(struct sockaddr_in)) < 0) {
perror("inet_wstream:connect");
exit(1);
}
/*
Write the quote and terminate. This will close the connection on
this end, so eventually an "EOF" will be detected remotely.
*/
left = sizeof(msg); put=0;
while (left > 0){
if((num = write(sock, msg+put, left)) < 0) {
perror("inet_wstream:write");
exit(1);
}
else left -= num;
put += num;
}
exit(0);
}
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