1 /* 2 * Copyright (c) 1986 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1986 The Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)streamwrite.c 6.3 (Berkeley) 03/07/89"; 26 #endif /* not lint */ 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\n", 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