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Annotation of 43BSDTahoe/ucb/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 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: static char sccsid[] = "@(#)get_names.c        5.5 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include "talk.h"
                     23: #include <sys/param.h>
                     24: #include <protocols/talkd.h>
                     25: #include <pwd.h>
                     26: 
                     27: char   *getlogin();
                     28: char   *ttyname();
                     29: char   *rindex();
                     30: extern CTL_MSG msg;
                     31: 
                     32: /*
                     33:  * Determine the local and remote user, tty, and machines
                     34:  */
                     35: get_names(argc, argv)
                     36:        int argc;
                     37:        char *argv[];
                     38: {
                     39:        char hostname[MAXHOSTNAMELEN];
                     40:        char *his_name, *my_name;
                     41:        char *my_machine_name, *his_machine_name;
                     42:        char *my_tty, *his_tty;
                     43:        register char *cp;
                     44: 
                     45:        if (argc < 2 ) {
                     46:                printf("Usage: talk user [ttyname]\n");
                     47:                exit(-1);
                     48:        }
                     49:        if (!isatty(0)) {
                     50:                printf("Standard input must be a tty, not a pipe or a file\n");
                     51:                exit(-1);
                     52:        }
                     53:        if ((my_name = getlogin()) == NULL) {
                     54:                struct passwd *pw;
                     55: 
                     56:                if ((pw = getpwuid(getuid())) == NULL) {
                     57:                        printf("You don't exist. Go away.\n");
                     58:                        exit(-1);
                     59:                }
                     60:                my_name = pw->pw_name;
                     61:        }
                     62:        gethostname(hostname, sizeof (hostname));
                     63:        my_machine_name = hostname;
                     64:        /* check for, and strip out, the machine name of the target */
                     65:        for (cp = argv[1]; *cp && !any(*cp, "@:!."); cp++)
                     66:                ;
                     67:        if (*cp == '\0') {
                     68:                /* this is a local to local talk */
                     69:                his_name = argv[1];
                     70:                his_machine_name = my_machine_name;
                     71:        } else {
                     72:                if (*cp++ == '@') {
                     73:                        /* user@host */
                     74:                        his_name = argv[1];
                     75:                        his_machine_name = cp;
                     76:                } else {
                     77:                        /* host.user or host!user or host:user */
                     78:                        his_name = cp;
                     79:                        his_machine_name = argv[1];
                     80:                }
                     81:                *--cp = '\0';
                     82:        }
                     83:        if (argc > 2)
                     84:                his_tty = argv[2];      /* tty name is arg 2 */
                     85:        else
                     86:                his_tty = "";
                     87:        get_addrs(my_machine_name, his_machine_name);
                     88:        /*
                     89:         * Initialize the message template.
                     90:         */
                     91:        msg.vers = TALK_VERSION;
                     92:        msg.addr.sa_family = htons(AF_INET);
                     93:        msg.ctl_addr.sa_family = htons(AF_INET);
                     94:        msg.id_num = htonl(0);
                     95:        strncpy(msg.l_name, my_name, NAME_SIZE);
                     96:        msg.l_name[NAME_SIZE - 1] = '\0';
                     97:        strncpy(msg.r_name, his_name, NAME_SIZE);
                     98:        msg.r_name[NAME_SIZE - 1] = '\0';
                     99:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
                    100:        msg.r_tty[TTY_SIZE - 1] = '\0';
                    101: }
                    102: 
                    103: static
                    104: any(c, cp)
                    105:        register char c, *cp;
                    106: {
                    107: 
                    108:        while (*cp)
                    109:                if (c == *cp++)
                    110:                        return (1);
                    111:        return (0);
                    112: }

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