bootparams/bpwhoami.tproj/bpwhoami.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved
  25  *
  26  * bpwhoami.c
  27  * - do a bootparams whoami call and echo the results to stdout
  28  *
  29  * The output is of the form:
  30  * host_name=<hostname>
  31  * nis_domain=<nis domain name>
  32  * router=<router ip address>
  33  * server_name=<server host name>
  34  * server_ip_address=<server ip address>
  35  *
  36  * The program will exit with the following codes:
  37  * 0    Successfully retrieved info
  38  * 1    RPC timed out while attempting to retrieve info
  39  * 2    Unrecoverable error ie. don't bother trying to call again
  40  *
  41  * Modification History:
  42  * Aug  5, 1997         Dieter Siegund (dieter@apple.com)
  43  * - lifted code from the old hostname -AUTOMATIC- source
  44  */
  45
  46
  47 #include <sys/param.h>
  48
  49 #include <err.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 void usage __P((void));
  56
  57 #include <netdb.h>
  58 #include <signal.h>
  59 #include <mach/boolean.h>
  60 #include <sys/types.h>
  61 #include <sys/file.h>
  62 #include <sys/fcntl.h>
  63 #include <sys/ioctl_compat.h>
  64 #include <sys/ioctl.h>
  65 #include <sys/socket.h>
  66 #include <sys/time.h>
  67 #include <net/if.h>
  68 #include <ifaddrs.h>
  69 #include <rpc/rpc.h>
  70 #include <arpa/inet.h>
  71 #include "bootparam_prot.h"
  72
  73 struct in_addr          ip_address;
  74 struct in_addr          net_mask;
  75
  76 static __inline__
  77 u_long iptohl(struct in_addr ip)
  78 {
  79     return (ntohl(ip.s_addr));
  80 }
  81
  82 static __inline__ boolean_t
  83 in_subnet(struct in_addr netaddr, struct in_addr netmask, struct in_addr ip)
  84 {
  85     if ((iptohl(ip) & iptohl(netmask))
  86         != (iptohl(netaddr) & iptohl(netmask))) {
  87         return (FALSE);
  88     }
  89     return (TRUE);
  90 }
  91
  92 bool_t
  93 each_whoresult(result, from)
  94      bp_whoami_res              *result;
  95      struct sockaddr_in *from;
  96 {
  97         if (result) {
  98             struct hostent *    host;
  99             struct in_addr *    router;
 100
 101             /*
 102              * guard against bogus router replies by making sure
 103              * that the default router is on the same subnet
 104              */
 105             router = (struct in_addr *)
 106                 &result->router_address.bp_address_u.ip_addr;
 107             if (in_subnet(*router, net_mask, ip_address)) {
 108                 if (result->client_name && result->client_name[0])
 109                     printf("host_name=%s\n", result->client_name);
 110                 if (result->domain_name && result->domain_name[0])
 111                     printf("nis_domain=%s\n", result->domain_name);
 112                 printf("router=%s\n", inet_ntoa(*router));
 113                 host = gethostbyaddr((char *) &from->sin_addr,
 114                                      sizeof (from->sin_addr), AF_INET);
 115                 if (host) {
 116                     printf("server_name=%s\n", host->h_name);
 117                 }
 118                 printf("server_ip_address=%s\n", inet_ntoa(from->sin_addr));
 119                 return(TRUE);
 120             }
 121         }
 122         return(FALSE);
 123 }
 124
 125
 126 static boolean_t
 127 getFirstInterface(struct sockaddr_in *ret_p)
 128 {
 129     struct ifaddrs *ifap;
 130     struct ifaddrs *ifcurrent;
 131     getifaddrs(&ifap);
 132
 133     for (ifcurrent = ifap; ifcurrent; ifcurrent = ifcurrent->ifa_next) {
 134         if (ifcurrent->ifa_addr->sa_family == AF_INET) {
 135             if ((ifcurrent->ifa_flags & IFF_LOOPBACK)
 136                      || !(ifcurrent->ifa_flags & IFF_UP))
 137                 continue;
 138             net_mask = ((struct sockaddr_in*)(ifcurrent->ifa_netmask))->sin_addr;
 139             *ret_p = *((struct sockaddr_in*)(ifcurrent->ifa_addr));
 140             freeifaddrs(ifap);
 141             return (TRUE);
 142         }
 143     }
 144     if (ifap)
 145         freeifaddrs(ifap);
 146     return (FALSE);
 147 }
 148
 149
 150 /*
 151  * Routine: bp_whoami
 152  * Function:
 153  *      Do a BOOTPARAMS WHOAMI RPC to find out hostname, domain,
 154  *      bootparams server, default router.
 155  */
 156 int
 157 bp_whoami()
 158 {
 159         extern enum clnt_stat   clnt_broadcast();
 160         struct sockaddr_in      sockin;
 161         enum clnt_stat          stat;
 162         struct bp_whoami_arg    who_arg;
 163         struct bp_whoami_res    who_res;
 164
 165         if (getFirstInterface(&sockin) == FALSE)
 166             return (2);
 167
 168         ip_address = sockin.sin_addr;
 169         who_arg.client_address.bp_address_u.ip_addr =
 170             *((ip_addr_t *)&sockin.sin_addr);
 171         who_arg.client_address.address_type = IP_ADDR_TYPE;
 172         bzero(&who_res, sizeof (who_res));
 173
 174         /*
 175          * Broadcast the whoami.
 176          */
 177         stat = clnt_broadcast(BOOTPARAMPROG, BOOTPARAMVERS,
 178                               BOOTPARAMPROC_WHOAMI, xdr_bp_whoami_arg,
 179                               &who_arg, xdr_bp_whoami_res, &who_res,
 180                               each_whoresult);
 181
 182         if (stat == RPC_SUCCESS) {
 183             return (0);
 184         }
 185         if (stat == RPC_TIMEDOUT)
 186             return (1);
 187         fprintf(stderr, "bpwhoami: ");
 188         clnt_perrno(stat);
 189         return (2);
 190 }
 191
 192 int
 193 main(argc,argv)
 194      int argc;
 195      char *argv[];
 196 {
 197     exit(bp_whoami());
 198 }