1 .\" Copyright (c) 1986, 1993 2 .\" The Regents of the University of California. All rights reserved. 3 .\" 4 .\" Redistribution and use in source and binary forms, with or without 5 .\" modification, are permitted provided that the following conditions 6 .\" are met: 7 .\" 1. Redistributions of source code must retain the above copyright 8 .\" notice, this list of conditions and the following disclaimer. 9 .\" 2. Redistributions in binary form must reproduce the above copyright 10 .\" notice, this list of conditions and the following disclaimer in the 11 .\" documentation and/or other materials provided with the distribution. 12 .\" 3. Neither the name of the University nor the names of its contributors 13 .\" may be used to endorse or promote products derived from this software 14 .\" without specific prior written permission. 15 .\" 16 .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 .\" SUCH DAMAGE. 27 .\" 28 #include <sys/types.h> 29 #include <sys/socket.h> 30 #include <netinet/in.h> 31 #include <netdb.h> 32 #include <stdio.h> 33 34 #define DATA "Half a league, half a league . . ." 35 36 /* 37 * This program creates a socket and initiates a connection with the socket 38 * given in the command line. One message is sent over the connection and 39 * then the socket is closed, ending the connection. The form of the command 40 * line is streamwrite hostname portnumber 41 */ 42 43 main(argc, argv) 44 int argc; 45 char *argv[]; 46 { 47 int sock; 48 struct sockaddr_in server; 49 struct hostent *hp, *gethostbyname(); 50 char buf[1024]; 51 52 /* Create socket */ 53 sock = socket(AF_INET, SOCK_STREAM, 0); 54 if (sock < 0) { 55 perror("opening stream socket"); 56 exit(1); 57 } 58 /* Connect socket using name specified by command line. */ 59 server.sin_family = AF_INET; 60 hp = gethostbyname(argv[1]); 61 if (hp == 0) { 62 fprintf(stderr, "%s: unknown host\en", argv[1]); 63 exit(2); 64 } 65 bcopy(hp->h_addr, &server.sin_addr, hp->h_length); 66 server.sin_port = htons(atoi(argv[2])); 67 68 if (connect(sock, &server, sizeof(server)) < 0) { 69 perror("connecting stream socket"); 70 exit(1); 71 } 72 if (write(sock, DATA, sizeof(DATA)) < 0) 73 perror("writing on stream socket"); 74 close(sock); 75 } 76