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Annotation of 43BSD/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.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  */
                      6: 
                      7: #ifndef lint
                      8: static char sccsid[] = "@(#)get_names.c        5.2 (Berkeley) 3/13/86";
                      9: #endif not lint
                     10: 
                     11: #include "talk.h"
                     12: #include <sys/param.h>
                     13: #include <protocols/talkd.h>
                     14: 
                     15: char   *getlogin();
                     16: char   *ttyname();
                     17: char   *rindex();
                     18: static any();
                     19: extern CTL_MSG msg;
                     20: 
                     21: /*
                     22:  * Determine the local and remote user, tty, and machines
                     23:  */
                     24: get_names(argc, argv)
                     25:        int argc;
                     26:        char *argv[];
                     27: {
                     28:        char hostname[MAXHOSTNAMELEN];
                     29:        char *his_name, *my_name;
                     30:        char *my_machine_name, *his_machine_name;
                     31:        char *my_tty, *his_tty;
                     32:        register char *cp;
                     33: 
                     34:        if (argc < 2 ) {
                     35:                printf("Usage: talk user [ttyname]\n");
                     36:                exit(-1);
                     37:        }
                     38:        if (!isatty(0)) {
                     39:                printf("Standard input must be a tty, not a pipe or a file\n");
                     40:                exit(-1);
                     41:        }
                     42:        my_name = getlogin();
                     43:        if (my_name == NULL) {
                     44:                printf("You don't exist. Go away.\n");
                     45:                exit(-1);
                     46:        }
                     47:        gethostname(hostname, sizeof (hostname));
                     48:        my_machine_name = hostname;
                     49:        my_tty = rindex(ttyname(0), '/') + 1;
                     50:        /* check for, and strip out, the machine name of the target */
                     51:        for (cp = argv[1]; *cp && !any(*cp, "@:!."); cp++)
                     52:                ;
                     53:        if (*cp == '\0') {
                     54:                /* this is a local to local talk */
                     55:                his_name = argv[1];
                     56:                his_machine_name = my_machine_name;
                     57:        } else {
                     58:                if (*cp++ == '@') {
                     59:                        /* user@host */
                     60:                        his_name = argv[1];
                     61:                        his_machine_name = cp;
                     62:                } else {
                     63:                        /* host.user or host!user or host:user */
                     64:                        his_name = cp;
                     65:                        his_machine_name = argv[1];
                     66:                }
                     67:                *--cp = '\0';
                     68:        }
                     69:        if (argc > 2)
                     70:                his_tty = argv[2];      /* tty name is arg 2 */
                     71:        else
                     72:                his_tty = "";
                     73:        get_addrs(my_machine_name, his_machine_name);
                     74:        /*
                     75:         * Initialize the message template.
                     76:         */
                     77:        msg.vers = TALK_VERSION;
                     78:        msg.addr.sa_family = htons(AF_INET);
                     79:        msg.ctl_addr.sa_family = htons(AF_INET);
                     80:        msg.id_num = htonl(0);
                     81:        strncpy(msg.l_name, my_name, NAME_SIZE);
                     82:        msg.l_name[NAME_SIZE - 1] = '\0';
                     83:        strncpy(msg.r_name, his_name, NAME_SIZE);
                     84:        msg.r_name[NAME_SIZE - 1] = '\0';
                     85:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
                     86:        msg.r_tty[TTY_SIZE - 1] = '\0';
                     87: }
                     88: 
                     89: static
                     90: any(c, cp)
                     91:        register char c, *cp;
                     92: {
                     93: 
                     94:        while (*cp)
                     95:                if (c == *cp++)
                     96:                        return (1);
                     97:        return (0);
                     98: }

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