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/* @(#)tcp.c 1.4 99/02/11 Connectathon Testsuite */
/*
* client for simple tcp ping program.
* open connection with server, who will echo request back.
*/
#define TCP_PORT 3456
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
static void
xxit(s)
char *s;
{
perror(s);
exit(1);
}
int
main(argc, argv)
int argc;
char **argv;
{
int s, len, ret;
struct sockaddr_in addr; /* socket address */
size_t addrlen = sizeof(struct sockaddr_in);
struct hostent *hp;
char *peer;
char buf[BUFSIZ];
char *msg = "This is a test message!";
if (argc != 2) {
fprintf(stderr, "usage: %s hostname\n", argv[0]);
exit(1);
}
peer = argv[1];
if ((hp = gethostbyname(peer)) == NULL) {
fprintf(stderr, "Can't find host %s\n", peer);
exit(1);
}
if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
xxit("socket");
addr.sin_family = AF_INET;
addr.sin_port = htons(TCP_PORT);
addr.sin_addr = *(struct in_addr *)hp->h_addr;
fprintf(stderr, "Connecting to %s (%x)\n", peer,
addr.sin_addr.s_addr);
if (connect(s, (struct sockaddr *)&addr, addrlen) < 0)
xxit("connect");
strcpy(buf, msg);
len = strlen(buf);
ret = write(s, buf, len);
fprintf(stderr, " write ret %d (len %d)\n", ret, len);
ret = read(s, buf, BUFSIZ);
fprintf(stderr, " read ret %d\n", ret);
if (ret != len || *buf != *msg + 1 || strcmp(buf+1, msg+1))
fprintf(stderr, "Message error: sent '%s' recv '%s'\n",
msg, buf);
else
fprintf(stderr, "tcp ping to %s ok\n", peer);
}
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