sunrpc/pmap_clnt.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  */
  29 /*
  30  * Copyright (C) 1984, Sun Microsystems, Inc.
  31  */
  32 /*
  33  * pmap_clnt.c
  34  * Client interface to pmap rpc service.
  35  */
  36
  37 #include <stdio.h>
  38 #include <unistd.h>
  39 #include <net/if.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <arpa/inet.h>
  44 #include <rpc/rpc.h>
  45 #include <rpc/pmap_prot.h>
  46 #include <rpc/pmap_clnt.h>
  47
  48 /*
  49  * Same as get_myaddress, but we try to use the loopback
  50  * interface. portmap caches interfaces, and on DHCP clients,
  51  * it could be that only loopback is started at this time.
  52  */
  53 static void
  54 __get_myaddress (struct sockaddr_in *addr)
  55 {
  56   int s;
  57   char buf[BUFSIZ];
  58   struct ifconf ifc;
  59   struct ifreq ifreq, *ifr;
  60   int len, loopback = 1;
  61
  62   if ((s = __socket (AF_INET, SOCK_DGRAM, 0)) < 0)
  63     {
  64       perror ("__get_myaddress: socket");
  65       exit (1);
  66     }
  67   ifc.ifc_len = sizeof (buf);
  68   ifc.ifc_buf = buf;
  69   if (__ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)
  70     {
  71       perror (_("__get_myaddress: ioctl (get interface configuration)"));
  72       exit (1);
  73     }
  74
  75  again:
  76   ifr = ifc.ifc_req;
  77   for (len = ifc.ifc_len; len; len -= sizeof ifreq)
  78     {
  79       ifreq = *ifr;
  80       if (__ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)
  81         {
  82           perror ("__get_myaddress: ioctl");
  83           exit (1);
  84         }
  85       if ((ifreq.ifr_flags & IFF_UP) && (ifr->ifr_addr.sa_family == AF_INET)
  86           && ((ifreq.ifr_flags & IFF_LOOPBACK) || (loopback == 0)))
  87         {
  88           *addr = *((struct sockaddr_in *) &ifr->ifr_addr);
  89           addr->sin_port = htons (PMAPPORT);
  90           __close (s);
  91           return;
  92         }
  93       ifr++;
  94     }
  95   if (loopback == 1)
  96     {
  97       loopback = 0;
  98       goto again;
  99     }
 100   __close (s);
 101 }
 102
 103
 104 static const struct timeval timeout = {5, 0};
 105 static const struct timeval tottimeout = {60, 0};
 106
 107 /*
 108  * Set a mapping between program,version and port.
 109  * Calls the pmap service remotely to do the mapping.
 110  */
 111 bool_t
 112 pmap_set (u_long program, u_long version, int protocol, u_short port)
 113 {
 114   struct sockaddr_in myaddress;
 115   int socket = -1;
 116   CLIENT *client;
 117   struct pmap parms;
 118   bool_t rslt;
 119
 120   __get_myaddress (&myaddress);
 121   client = clntudp_bufcreate (&myaddress, PMAPPROG, PMAPVERS,
 122                         timeout, &socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
 123   if (client == (CLIENT *) NULL)
 124     return (FALSE);
 125   parms.pm_prog = program;
 126   parms.pm_vers = version;
 127   parms.pm_prot = protocol;
 128   parms.pm_port = port;
 129   if (CLNT_CALL (client, PMAPPROC_SET, (xdrproc_t)xdr_pmap, (caddr_t)&parms,
 130                  (xdrproc_t)xdr_bool, (caddr_t)&rslt,
 131                  tottimeout) != RPC_SUCCESS)
 132     {
 133       clnt_perror (client, _("Cannot register service"));
 134       return FALSE;
 135     }
 136   CLNT_DESTROY (client);
 137   /* (void)close(socket); CLNT_DESTROY closes it */
 138   return rslt;
 139 }
 140
 141 /*
 142  * Remove the mapping between program,version and port.
 143  * Calls the pmap service remotely to do the un-mapping.
 144  */
 145 bool_t
 146 pmap_unset (u_long program, u_long version)
 147 {
 148   struct sockaddr_in myaddress;
 149   int socket = -1;
 150   CLIENT *client;
 151   struct pmap parms;
 152   bool_t rslt;
 153
 154   __get_myaddress (&myaddress);
 155   client = clntudp_bufcreate (&myaddress, PMAPPROG, PMAPVERS,
 156                         timeout, &socket, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
 157   if (client == (CLIENT *) NULL)
 158     return FALSE;
 159   parms.pm_prog = program;
 160   parms.pm_vers = version;
 161   parms.pm_port = parms.pm_prot = 0;
 162   CLNT_CALL (client, PMAPPROC_UNSET, (xdrproc_t)xdr_pmap, (caddr_t)&parms,
 163              (xdrproc_t)xdr_bool, (caddr_t)&rslt, tottimeout);
 164   CLNT_DESTROY (client);
 165   /* (void)close(socket); CLNT_DESTROY already closed it */
 166   return rslt;
 167 }