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