games/hunt/huntd/get_names.c

   1 /*      $NetBSD: get_names.c,v 1.9 2009/07/04 02:37:20 dholland Exp $   */
   2 /*
   3  * Copyright (c) 1983-2003, Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  * + Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  * + Redistributions in binary form must reproduce the above copyright
  13  *   notice, this list of conditions and the following disclaimer in the
  14  *   documentation and/or other materials provided with the distribution.
  15  * + Neither the name of the University of California, San Francisco nor
  16  *   the names of its contributors may be used to endorse or promote
  17  *   products derived from this software without specific prior written
  18  *   permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  21  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  23  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 #ifndef lint
  35 __RCSID("$NetBSD: get_names.c,v 1.9 2009/07/04 02:37:20 dholland Exp $");
  36 #endif /* not lint */
  37
  38 #include "bsd.h"
  39
  40 #if defined(TALK_43) || defined(TALK_42)
  41
  42 #include <sys/param.h>
  43 #include <netdb.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48 #include "hunt.h"
  49 #include "talk_ctl.h"
  50
  51 static char hostname[MAXHOSTNAMELEN + 1];
  52 char *my_machine_name;
  53
  54 /*
  55  * Determine the local user and machine
  56  */
  57 void
  58 get_local_name(char *my_name)
  59 {
  60         struct hostent *hp;
  61         struct servent *sp;
  62
  63         /* Load these useful values into the standard message header */
  64         msg.id_num = 0;
  65         (void) strncpy(msg.l_name, my_name, NAME_SIZE);
  66         msg.l_name[NAME_SIZE - 1] = '\0';
  67         msg.r_tty[0] = '\0';
  68         msg.pid = getpid();
  69 #ifdef TALK_43
  70         msg.vers = TALK_VERSION;
  71         msg.addr.sa_family = htons(AF_INET);
  72         msg.ctl_addr.sa_family = htons(AF_INET);
  73 #else
  74         msg.addr.sin_family = htons(AF_INET);
  75         msg.ctl_addr.sin_family = htons(AF_INET);
  76 #endif
  77
  78         (void)gethostname(hostname, sizeof (hostname));
  79         hostname[sizeof(hostname) - 1] = '\0';
  80         my_machine_name = hostname;
  81         /* look up the address of the local host */
  82         hp = gethostbyname(my_machine_name);
  83         if (hp == (struct hostent *) 0) {
  84 #ifdef LOG
  85                 syslog(LOG_ERR,
  86                     "This machine doesn't exist. Boy, am I confused!");
  87 #else
  88                 perror("This machine doesn't exist. Boy, am I confused!");
  89 #endif
  90                 exit(1);
  91         }
  92         memcpy(&my_machine_addr, hp->h_addr, hp->h_length);
  93         /* find the daemon portal */
  94 #ifdef TALK_43
  95         sp = getservbyname("ntalk", "udp");
  96 #else
  97         sp = getservbyname("talk", "udp");
  98 #endif
  99         if (sp == 0) {
 100 #ifdef LOG
 101                 syslog(LOG_ERR, "This machine doesn't support talk");
 102 #else
 103                 perror("This machine doesn't support talk");
 104 #endif
 105                 exit(1);
 106         }
 107         daemon_port = sp->s_port;
 108 }
 109
 110 /*
 111  * Determine the remote user and machine
 112  */
 113 int
 114 get_remote_name(char *his_address)
 115 {
 116         char *his_name;
 117         char *his_machine_name;
 118         char *ptr;
 119         struct hostent *hp;
 120
 121         /* check for, and strip out, the machine name of the target */
 122         for (ptr = his_address; *ptr != '\0' && *ptr != '@' && *ptr != ':'
 123                                         && *ptr != '!' && *ptr != '.'; ptr++)
 124                 continue;
 125         if (*ptr == '\0') {
 126                 /* this is a local to local talk */
 127                 his_name = his_address;
 128                 his_machine_name = my_machine_name;
 129         } else {
 130                 if (*ptr == '@') {
 131                         /* user@host */
 132                         his_name = his_address;
 133                         his_machine_name = ptr + 1;
 134                 } else {
 135                         /* host.user or host!user or host:user */
 136                         his_name = ptr + 1;
 137                         his_machine_name = his_address;
 138                 }
 139                 *ptr = '\0';
 140         }
 141         /* Load these useful values into the standard message header */
 142         (void) strncpy(msg.r_name, his_name, NAME_SIZE);
 143         msg.r_name[NAME_SIZE - 1] = '\0';
 144
 145         /* if he is on the same machine, then simply copy */
 146         if (memcmp(&his_machine_name, &my_machine_name,
 147                                                 sizeof(his_machine_name)) == 0)
 148                 memcpy(&his_machine_addr, &my_machine_addr,
 149                                                 sizeof(his_machine_name));
 150         else {
 151                 /* look up the address of the recipient's machine */
 152                 hp = gethostbyname(his_machine_name);
 153                 if (hp == (struct hostent *) 0)
 154                         return 0;                       /* unknown host */
 155                 memcpy(&his_machine_addr, hp->h_addr, hp->h_length);
 156         }
 157         return 1;
 158 }
 159 #endif