bootparams/bpwhoami.tproj/bpwhoami.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved
  26  *
  27  * bpwhoami.c
  28  * - do a bootparams whoami call and echo the results to stdout
  29  *
  30  * The output is of the form:
  31  * host_name=<hostname>
  32  * nis_domain=<nis domain name>
  33  * router=<router ip address>
  34  * server_name=<server host name>
  35  * server_ip_address=<server ip address>
  36  *
  37  * The program will exit with the following codes:
  38  * 0    Successfully retrieved info
  39  * 1    RPC timed out while attempting to retrieve info
  40  * 2    Unrecoverable error ie. don't bother trying to call again
  41  *
  42  * Modification History:
  43  * Aug  5, 1997         Dieter Siegund (dieter@apple.com)
  44  * - lifted code from the old hostname -AUTOMATIC- source
  45  */
  46
  47
  48 #include <sys/param.h>
  49
  50 #include <err.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 void usage __P((void));
  57
  58 #include <netdb.h>
  59 #include <signal.h>
  60 #include <mach/boolean.h>
  61 #include <sys/types.h>
  62 #include <sys/file.h>
  63 #include <sys/fcntl.h>
  64 #include <sys/ioctl_compat.h>
  65 #include <sys/ioctl.h>
  66 #include <sys/socket.h>
  67 #include <sys/time.h>
  68 #include <net/if.h>
  69 #include <ifaddrs.h>
  70 #include <rpc/rpc.h>
  71 #include <arpa/inet.h>
  72 #include "bootparam_prot.h"
  73
  74 struct in_addr          ip_address;
  75 struct in_addr          net_mask;
  76
  77 static __inline__
  78 u_long iptohl(struct in_addr ip)
  79 {
  80     return (ntohl(ip.s_addr));
  81 }
  82
  83 static __inline__ boolean_t
  84 in_subnet(struct in_addr netaddr, struct in_addr netmask, struct in_addr ip)
  85 {
  86     if ((iptohl(ip) & iptohl(netmask))
  87         != (iptohl(netaddr) & iptohl(netmask))) {
  88         return (FALSE);
  89     }
  90     return (TRUE);
  91 }
  92
  93 bool_t
  94 each_whoresult(result, from)
  95      bp_whoami_res              *result;
  96      struct sockaddr_in *from;
  97 {
  98         if (result) {
  99             struct hostent *    host;
 100             struct in_addr *    router;
 101
 102             /*
 103              * guard against bogus router replies by making sure
 104              * that the default router is on the same subnet
 105              */
 106             router = (struct in_addr *)
 107                 &result->router_address.bp_address_u.ip_addr;
 108             if (in_subnet(*router, net_mask, ip_address)) {
 109                 if (result->client_name && result->client_name[0])
 110                     printf("host_name=%s\n", result->client_name);
 111                 if (result->domain_name && result->domain_name[0])
 112                     printf("nis_domain=%s\n", result->domain_name);
 113                 printf("router=%s\n", inet_ntoa(*router));
 114                 host = gethostbyaddr((char *) &from->sin_addr,
 115                                      sizeof (from->sin_addr), AF_INET);
 116                 if (host) {
 117                     printf("server_name=%s\n", host->h_name);
 118                 }
 119                 printf("server_ip_address=%s\n", inet_ntoa(from->sin_addr));
 120                 return(TRUE);
 121             }
 122         }
 123         return(FALSE);
 124 }
 125
 126
 127 static boolean_t
 128 getFirstInterface(struct sockaddr_in *ret_p)
 129 {
 130     struct ifaddrs *ifap;
 131     struct ifaddrs *ifcurrent;
 132     getifaddrs(&ifap);
 133
 134     for (ifcurrent = ifap; ifcurrent; ifcurrent = ifcurrent->ifa_next) {
 135         if (ifcurrent->ifa_addr->sa_family == AF_INET) {
 136             if ((ifcurrent->ifa_flags & IFF_LOOPBACK)
 137                      || !(ifcurrent->ifa_flags & IFF_UP))
 138                 continue;
 139             net_mask = ((struct sockaddr_in*)(ifcurrent->ifa_netmask))->sin_addr;
 140             *ret_p = *((struct sockaddr_in*)(ifcurrent->ifa_addr));
 141             freeifaddrs(ifap);
 142             return (TRUE);
 143         }
 144     }
 145     if (ifap)
 146         freeifaddrs(ifap);
 147     return (FALSE);
 148 }
 149
 150
 151 /*
 152  * Routine: bp_whoami
 153  * Function:
 154  *      Do a BOOTPARAMS WHOAMI RPC to find out hostname, domain,
 155  *      bootparams server, default router.
 156  */
 157 int
 158 bp_whoami()
 159 {
 160         extern enum clnt_stat   clnt_broadcast();
 161         struct sockaddr_in      sockin;
 162         enum clnt_stat          stat;
 163         struct bp_whoami_arg    who_arg;
 164         struct bp_whoami_res    who_res;
 165
 166         if (getFirstInterface(&sockin) == FALSE)
 167             return (2);
 168
 169         ip_address = sockin.sin_addr;
 170         who_arg.client_address.bp_address_u.ip_addr =
 171             *((ip_addr_t *)&sockin.sin_addr);
 172         who_arg.client_address.address_type = IP_ADDR_TYPE;
 173         bzero(&who_res, sizeof (who_res));
 174
 175         /*
 176          * Broadcast the whoami.
 177          */
 178         stat = clnt_broadcast(BOOTPARAMPROG, BOOTPARAMVERS,
 179                               BOOTPARAMPROC_WHOAMI, xdr_bp_whoami_arg,
 180                               &who_arg, xdr_bp_whoami_res, &who_res,
 181                               each_whoresult);
 182
 183         if (stat == RPC_SUCCESS) {
 184             return (0);
 185         }
 186         if (stat == RPC_TIMEDOUT)
 187             return (1);
 188         fprintf(stderr, "bpwhoami: ");
 189         clnt_perrno(stat);
 190         return (2);
 191 }
 192
 193 int
 194 main(argc,argv)
 195      int argc;
 196      char *argv[];
 197 {
 198     exit(bp_whoami());
 199 }