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Annotation of 43BSDTahoe/ucb/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 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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