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Annotation of 43BSDReno/usr.bin/talk/get_names.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 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: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: static char sccsid[] = "@(#)get_names.c        5.8 (Berkeley) 6/1/90";
                     22: #endif /* not lint */
                     23: 
                     24: #include "talk.h"
                     25: #include <sys/param.h>
                     26: #include <protocols/talkd.h>
                     27: #include <pwd.h>
                     28: 
                     29: char   *getlogin();
                     30: char   *ttyname();
                     31: char   *rindex();
                     32: extern CTL_MSG msg;
                     33: 
                     34: /*
                     35:  * Determine the local and remote user, tty, and machines
                     36:  */
                     37: get_names(argc, argv)
                     38:        int argc;
                     39:        char *argv[];
                     40: {
                     41:        char hostname[MAXHOSTNAMELEN];
                     42:        char *his_name, *my_name;
                     43:        char *my_machine_name, *his_machine_name;
                     44:        char *my_tty, *his_tty;
                     45:        register char *cp;
                     46: 
                     47:        if (argc < 2 ) {
                     48:                printf("Usage: talk user [ttyname]\n");
                     49:                exit(-1);
                     50:        }
                     51:        if (!isatty(0)) {
                     52:                printf("Standard input must be a tty, not a pipe or a file\n");
                     53:                exit(-1);
                     54:        }
                     55:        if ((my_name = getlogin()) == NULL) {
                     56:                struct passwd *pw;
                     57: 
                     58:                if ((pw = getpwuid(getuid())) == NULL) {
                     59:                        printf("You don't exist. Go away.\n");
                     60:                        exit(-1);
                     61:                }
                     62:                my_name = pw->pw_name;
                     63:        }
                     64:        gethostname(hostname, sizeof (hostname));
                     65:        my_machine_name = hostname;
                     66:        /* check for, and strip out, the machine name of the target */
                     67:        for (cp = argv[1]; *cp && !any(*cp, "@:!."); cp++)
                     68:                ;
                     69:        if (*cp == '\0') {
                     70:                /* this is a local to local talk */
                     71:                his_name = argv[1];
                     72:                his_machine_name = my_machine_name;
                     73:        } else {
                     74:                if (*cp++ == '@') {
                     75:                        /* user@host */
                     76:                        his_name = argv[1];
                     77:                        his_machine_name = cp;
                     78:                } else {
                     79:                        /* host.user or host!user or host:user */
                     80:                        his_name = cp;
                     81:                        his_machine_name = argv[1];
                     82:                }
                     83:                *--cp = '\0';
                     84:        }
                     85:        if (argc > 2)
                     86:                his_tty = argv[2];      /* tty name is arg 2 */
                     87:        else
                     88:                his_tty = "";
                     89:        get_addrs(my_machine_name, his_machine_name);
                     90:        /*
                     91:         * Initialize the message template.
                     92:         */
                     93:        msg.vers = TALK_VERSION;
                     94:        msg.addr.sa_family = htons(AF_INET);
                     95:        msg.ctl_addr.sa_family = htons(AF_INET);
                     96:        msg.id_num = htonl(0);
                     97:        strncpy(msg.l_name, my_name, NAME_SIZE);
                     98:        msg.l_name[NAME_SIZE - 1] = '\0';
                     99:        strncpy(msg.r_name, his_name, NAME_SIZE);
                    100:        msg.r_name[NAME_SIZE - 1] = '\0';
                    101:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
                    102:        msg.r_tty[TTY_SIZE - 1] = '\0';
                    103: }
                    104: 
                    105: static
                    106: any(c, cp)
                    107:        register char c, *cp;
                    108: {
                    109: 
                    110:        while (*cp)
                    111:                if (c == *cp++)
                    112:                        return (1);
                    113:        return (0);
                    114: }

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