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Annotation of src/usr.bin/talk/get_names.c, Revision 1.4

1.4     ! jkatz       1: /*     $OpenBSD: get_names.c,v 1.3 1997/01/17 07:13:28 millert Exp $   */
1.1       deraadt     2: /*     $NetBSD: get_names.c,v 1.4 1994/12/09 02:14:16 jtc Exp $        */
                      3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * Redistribution and use in source and binary forms, with or without
                      9:  * modification, are permitted provided that the following conditions
                     10:  * are met:
                     11:  * 1. Redistributions of source code must retain the above copyright
                     12:  *    notice, this list of conditions and the following disclaimer.
                     13:  * 2. Redistributions in binary form must reproduce the above copyright
                     14:  *    notice, this list of conditions and the following disclaimer in the
                     15:  *    documentation and/or other materials provided with the distribution.
                     16:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
                     35:  */
                     36:
                     37: #ifndef lint
                     38: #if 0
                     39: static char sccsid[] = "@(#)get_names.c        8.1 (Berkeley) 6/6/93";
                     40: #endif
1.4     ! jkatz      41: static char rcsid[] = "$OpenBSD: get_names.c,v 1.3 1997/01/17 07:13:28 millert Exp $";
1.1       deraadt    42: #endif /* not lint */
                     43:
                     44: #include <sys/param.h>
                     45: #include <sys/socket.h>
                     46: #include <protocols/talkd.h>
                     47: #include <pwd.h>
                     48: #include <string.h>
                     49: #include "talk.h"
                     50:
                     51: char   *getlogin();
                     52: char   *ttyname();
                     53: extern CTL_MSG msg;
                     54:
                     55: /*
                     56:  * Determine the local and remote user, tty, and machines
                     57:  */
                     58: get_names(argc, argv)
                     59:        int argc;
                     60:        char *argv[];
                     61: {
                     62:        char hostname[MAXHOSTNAMELEN];
                     63:        char *his_name, *my_name;
                     64:        char *my_machine_name, *his_machine_name;
                     65:        char *my_tty, *his_tty;
                     66:        register char *cp;
                     67:        char *names;
                     68:
                     69:        if (argc < 2 ) {
                     70:                printf("Usage: talk user [ttyname]\n");
1.4     ! jkatz      71:                printf("       talk user@hostname [ttyname]\n");
1.1       deraadt    72:                exit(-1);
                     73:        }
                     74:        if (!isatty(0)) {
                     75:                printf("Standard input must be a tty, not a pipe or a file\n");
                     76:                exit(-1);
                     77:        }
1.4     ! jkatz      78:
        !            79:        if ('@' == argv[1][0]) {
        !            80:                printf("Usage: talk user [ttyname]\n");
        !            81:                printf("       talk user@hostname [ttyname]\n");
        !            82:                exit(-1);
        !            83:        }
        !            84:
1.1       deraadt    85:        if ((my_name = getlogin()) == NULL) {
                     86:                struct passwd *pw;
                     87:
                     88:                if ((pw = getpwuid(getuid())) == NULL) {
                     89:                        printf("You don't exist. Go away.\n");
                     90:                        exit(-1);
                     91:                }
                     92:                my_name = pw->pw_name;
                     93:        }
                     94:        gethostname(hostname, sizeof (hostname));
                     95:        my_machine_name = hostname;
                     96:        /* check for, and strip out, the machine name of the target */
                     97:        names = strdup(argv[1]);
1.3       millert    98:        for (cp = names; *cp && !strchr("@:!.", *cp); cp++)
1.1       deraadt    99:                ;
                    100:        if (*cp == '\0') {
                    101:                /* this is a local to local talk */
                    102:                his_name = names;
                    103:                his_machine_name = my_machine_name;
                    104:        } else {
                    105:                if (*cp++ == '@') {
                    106:                        /* user@host */
                    107:                        his_name = names;
                    108:                        his_machine_name = cp;
                    109:                } else {
                    110:                        /* host.user or host!user or host:user */
                    111:                        his_name = cp;
                    112:                        his_machine_name = names;
                    113:                }
                    114:                *--cp = '\0';
                    115:        }
                    116:        if (argc > 2)
                    117:                his_tty = argv[2];      /* tty name is arg 2 */
                    118:        else
                    119:                his_tty = "";
                    120:        get_addrs(my_machine_name, his_machine_name);
                    121:        /*
                    122:         * Initialize the message template.
                    123:         */
                    124:        msg.vers = TALK_VERSION;
                    125:        msg.addr.sa_family = htons(AF_INET);
                    126:        msg.ctl_addr.sa_family = htons(AF_INET);
                    127:        msg.id_num = htonl(0);
                    128:        strncpy(msg.l_name, my_name, NAME_SIZE);
                    129:        msg.l_name[NAME_SIZE - 1] = '\0';
                    130:        strncpy(msg.r_name, his_name, NAME_SIZE);
                    131:        msg.r_name[NAME_SIZE - 1] = '\0';
                    132:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
                    133:        msg.r_tty[TTY_SIZE - 1] = '\0';
                    134: }