101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
/* This file is part of the sample code and exercises
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* used by the class "Advanced Programming in the UNIX
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* Environment" taught by Jan Schaumann
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* <jschauma@netmeister.org> at Stevens Institute of
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* Technology.
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*
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* https://stevens.netmeister.org/631/
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*/
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/* $NetBSD: streamwrite.c,v 1.3 2003/08/07 10:30:50 agc Exp $
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*
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* Copyright (c) 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)streamwrite.c 8.1 (Berkeley) 6/8/93
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*/
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* http://poetry.eserver.org/light-brigade.html */
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#define DATA "Half a league, half a league . . ."
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/*
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* This program creates a socket and initiates a connection with the socket
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* given in the command line. One message is sent over the connection and
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* then the socket is closed, ending the connection. The form of the command
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* line is streamwrite hostname portnumber
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*/
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int main(int argc, char **argv)
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{
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int sock, port;
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struct sockaddr_in6 server;
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struct hostent *hp;
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memset(&server, 0, sizeof(server));
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if (argc != 3) {
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(void)printf("Usage: %s hostname port\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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port = atoi(argv[2]);
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if ((port < 1) || (port > 65536)) {
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(void)fprintf(stderr, "Invalid port: %s\n", argv[2]);
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exit(EXIT_FAILURE);
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}
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if ((sock = socket(PF_INET6, SOCK_STREAM, 0)) < 0) {
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perror("opening stream socket");
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exit(EXIT_FAILURE);
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}
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server.sin6_family = PF_INET6;
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if ((hp = gethostbyname2(argv[1], PF_INET6)) == NULL) {
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(void)fprintf(stderr, "%s: unknown host\n", argv[1]);
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exit(EXIT_FAILURE);
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}
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bcopy(hp->h_addr, &server.sin6_addr, hp->h_length);
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server.sin6_port = htons(port);
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if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0) {
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perror("connecting stream socket");
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exit(EXIT_FAILURE);
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}
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if (write(sock, DATA, sizeof(DATA)) < 0)
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perror("writing on stream socket");
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(void)close(sock);
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return EXIT_FAILURE;
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}
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