67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* @(#)tcp.c 1.1 97/01/03 Connectathon Testsuite */
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/*
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* client for simple tcp ping program.
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* open connection with server, who will echo request back.
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*/
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#define TCP_PORT 3456
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netdb.h>
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main(argc, argv)
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char **argv;
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{
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int s, len, ret;
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struct sockaddr_in addr; /* socket address */
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int addrlen = sizeof(struct sockaddr_in);
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struct hostent *hp;
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char *peer;
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char buf[BUFSIZ];
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char *msg = "This is a test message!";
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if (argc != 2) {
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fprintf(stderr, "usage: %s hostname\n", argv[0]);
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exit(1);
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}
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peer = argv[1];
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if ((hp = gethostbyname(peer)) == NULL) {
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fprintf(stderr, "Can't find host %s\n", peer);
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exit(1);
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}
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if ((s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
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xxit("socket");
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addr.sin_family = AF_INET;
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addr.sin_port = htons(TCP_PORT);
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addr.sin_addr = *(struct in_addr *)hp->h_addr;
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fprintf(stderr, "Connecting to %s (%x)\n", peer,
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addr.sin_addr.s_addr);
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if (connect(s, (struct sockaddr *)&addr, addrlen) < 0)
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xxit("connect");
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strcpy(buf, msg);
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len = strlen(buf);
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ret = write(s, buf, len);
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fprintf(stderr, " write ret %d (len %d)\n", ret, len);
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ret = read(s, buf, BUFSIZ);
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fprintf(stderr, " read ret %d\n", ret);
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if (ret != len || *buf != *msg + 1 || strcmp(buf+1, msg+1))
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fprintf(stderr, "Message error: sent '%s' recv '%s'\n",
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msg, buf);
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else
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fprintf(stderr, "tcp ping to %s ok\n", peer);
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}
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xxit(s)
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char *s;
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{
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perror(s);
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exit(1);
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}
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