1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)get_names.c 8.1 (Berkeley) 06/06/93"; 10 #endif /* not lint */ 11 12 #include <sys/param.h> 13 #include <sys/socket.h> 14 #include <protocols/talkd.h> 15 #include <pwd.h> 16 #include "talk.h" 17 18 char *getlogin(); 19 char *ttyname(); 20 char *rindex(); 21 extern CTL_MSG msg; 22 23 /* 24 * Determine the local and remote user, tty, and machines 25 */ 26 get_names(argc, argv) 27 int argc; 28 char *argv[]; 29 { 30 char hostname[MAXHOSTNAMELEN]; 31 char *his_name, *my_name; 32 char *my_machine_name, *his_machine_name; 33 char *my_tty, *his_tty; 34 register char *cp; 35 36 if (argc < 2 ) { 37 printf("Usage: talk user [ttyname]\n"); 38 exit(-1); 39 } 40 if (!isatty(0)) { 41 printf("Standard input must be a tty, not a pipe or a file\n"); 42 exit(-1); 43 } 44 if ((my_name = getlogin()) == NULL) { 45 struct passwd *pw; 46 47 if ((pw = getpwuid(getuid())) == NULL) { 48 printf("You don't exist. Go away.\n"); 49 exit(-1); 50 } 51 my_name = pw->pw_name; 52 } 53 gethostname(hostname, sizeof (hostname)); 54 my_machine_name = hostname; 55 /* check for, and strip out, the machine name of the target */ 56 for (cp = argv[1]; *cp && !index("@:!.", *cp); cp++) 57 ; 58 if (*cp == '\0') { 59 /* this is a local to local talk */ 60 his_name = argv[1]; 61 his_machine_name = my_machine_name; 62 } else { 63 if (*cp++ == '@') { 64 /* user@host */ 65 his_name = argv[1]; 66 his_machine_name = cp; 67 } else { 68 /* host.user or host!user or host:user */ 69 his_name = cp; 70 his_machine_name = argv[1]; 71 } 72 *--cp = '\0'; 73 } 74 if (argc > 2) 75 his_tty = argv[2]; /* tty name is arg 2 */ 76 else 77 his_tty = ""; 78 get_addrs(my_machine_name, his_machine_name); 79 /* 80 * Initialize the message template. 81 */ 82 msg.vers = TALK_VERSION; 83 msg.addr.sa_family = htons(AF_INET); 84 msg.ctl_addr.sa_family = htons(AF_INET); 85 msg.id_num = htonl(0); 86 strncpy(msg.l_name, my_name, NAME_SIZE); 87 msg.l_name[NAME_SIZE - 1] = '\0'; 88 strncpy(msg.r_name, his_name, NAME_SIZE); 89 msg.r_name[NAME_SIZE - 1] = '\0'; 90 strncpy(msg.r_tty, his_tty, TTY_SIZE); 91 msg.r_tty[TTY_SIZE - 1] = '\0'; 92 } 93