tests/fs/nfs/nfsservice/rpcbind/check_bound.c

   1 /*      $NetBSD: check_bound.c,v 1.1 2010/07/26 15:53:00 pooka Exp $    */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31 /*
  32  * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc.
  33  */
  34
  35 /* #ident       "@(#)check_bound.c      1.15    93/07/05 SMI" */
  36
  37 #if 0
  38 #ifndef lint
  39 static  char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro";
  40 #endif
  41 #endif
  42
  43 /*
  44  * check_bound.c
  45  * Checks to see whether the program is still bound to the
  46  * claimed address and returns the univeral merged address
  47  *
  48  */
  49
  50 #include <sys/types.h>
  51 #include <sys/socket.h>
  52 #include <rpc/rpc.h>
  53 #include <stdio.h>
  54 #include <netconfig.h>
  55 #include <syslog.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58 #include <stdlib.h>
  59
  60 #include <rump/rump.h>
  61 #include <rump/rump_syscalls.h>
  62
  63 #include "rpcbind.h"
  64
  65 struct fdlist {
  66         int fd;
  67         struct netconfig *nconf;
  68         struct fdlist *next;
  69         int check_binding;
  70 };
  71
  72 static struct fdlist *fdhead;   /* Link list of the check fd's */
  73 static struct fdlist *fdtail;
  74 static const char emptystring[] = "";
  75
  76 static bool_t check_bound(struct fdlist *, const char *uaddr);
  77
  78 /*
  79  * Returns 1 if the given address is bound for the given addr & transport
  80  * For all error cases, we assume that the address is bound
  81  * Returns 0 for success.
  82  */
  83 static bool_t
  84 check_bound(struct fdlist *fdl, const char *uaddr)
  85 {
  86         int fd;
  87         struct netbuf *na;
  88         int ans;
  89
  90         if (fdl->check_binding == FALSE)
  91                 return (TRUE);
  92
  93         na = uaddr2taddr(fdl->nconf, uaddr);
  94         if (!na)
  95                 return (TRUE); /* punt, should never happen */
  96
  97         fd = __rpc_nconf2fd(fdl->nconf);
  98         if (fd < 0) {
  99                 free(na);
 100                 return (TRUE);
 101         }
 102
 103         ans = bind(fd, (struct sockaddr *)na->buf, na->len);
 104
 105         rump_sys_close(fd);
 106         free(na);
 107
 108         return (ans == 0 ? FALSE : TRUE);
 109 }
 110
 111 int
 112 add_bndlist(struct netconfig *nconf, struct netbuf *baddr)
 113 {
 114         struct fdlist *fdl;
 115         struct netconfig *newnconf;
 116
 117         newnconf = getnetconfigent(nconf->nc_netid);
 118         if (newnconf == NULL)
 119                 return (-1);
 120         fdl = (struct fdlist *)malloc((u_int)sizeof (struct fdlist));
 121         if (fdl == NULL) {
 122                 freenetconfigent(newnconf);
 123                 syslog(LOG_ERR, "no memory!");
 124                 return (-1);
 125         }
 126         fdl->nconf = newnconf;
 127         fdl->next = NULL;
 128         if (fdhead == NULL) {
 129                 fdhead = fdl;
 130                 fdtail = fdl;
 131         } else {
 132                 fdtail->next = fdl;
 133                 fdtail = fdl;
 134         }
 135         /* XXX no bound checking for now */
 136         fdl->check_binding = FALSE;
 137
 138         return 0;
 139 }
 140
 141 bool_t
 142 is_bound(const char *netid, const char *uaddr)
 143 {
 144         struct fdlist *fdl;
 145
 146         for (fdl = fdhead; fdl; fdl = fdl->next)
 147                 if (strcmp(fdl->nconf->nc_netid, netid) == 0)
 148                         break;
 149         if (fdl == NULL)
 150                 return (TRUE);
 151         return (check_bound(fdl, uaddr));
 152 }
 153
 154 /*
 155  * Returns NULL if there was some system error.
 156  * Returns "" if the address was not bound, i.e the server crashed.
 157  * Returns the merged address otherwise.
 158  */
 159 char *
 160 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr)
 161 {
 162         struct fdlist *fdl;
 163         char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL;
 164
 165         for (fdl = fdhead; fdl; fdl = fdl->next)
 166                 if (strcmp(fdl->nconf->nc_netid, netid) == 0)
 167                         break;
 168         if (fdl == NULL)
 169                 return (NULL);
 170         if (check_bound(fdl, uaddr) == FALSE)
 171                 /* that server died */
 172                 return strdup(emptystring);
 173         /*
 174          * If saddr is not NULL, the remote client may have included the
 175          * address by which it contacted us.  Use that for the "client" uaddr,
 176          * otherwise use the info from the SVCXPRT.
 177          */
 178         if (saddr != NULL) {
 179                 c_uaddr = saddr;
 180         } else {
 181                 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt));
 182                 if (c_uaddr == NULL) {
 183                         syslog(LOG_ERR, "taddr2uaddr failed for %s",
 184                                 fdl->nconf->nc_netid);
 185                         return (NULL);
 186                 }
 187                 allocated_uaddr = c_uaddr;
 188         }
 189
 190 #ifdef RPCBIND_DEBUG
 191         if (debugging) {
 192                 if (saddr == NULL) {
 193                         fprintf(stderr, "mergeaddr: client uaddr = %s\n",
 194                             c_uaddr);
 195                 } else {
 196                         fprintf(stderr, "mergeaddr: contact uaddr = %s\n",
 197                             c_uaddr);
 198                 }
 199         }
 200 #endif
 201         s_uaddr = uaddr;
 202         /*
 203          * This is all we should need for IP 4 and 6
 204          */
 205         m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid);
 206 #ifdef RPCBIND_DEBUG
 207         if (debugging)
 208                 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n",
 209                                 uaddr, m_uaddr);
 210 #endif
 211         if (allocated_uaddr != NULL)
 212                 free(allocated_uaddr);
 213         return (m_uaddr);
 214 }
 215
 216 /*
 217  * Returns a netconf structure from its internal list.  This
 218  * structure should not be freed.
 219  */
 220 struct netconfig *
 221 rpcbind_get_conf(const char *netid)
 222 {
 223         struct fdlist *fdl;
 224
 225         for (fdl = fdhead; fdl; fdl = fdl->next)
 226                 if (strcmp(fdl->nconf->nc_netid, netid) == 0)
 227                         break;
 228         if (fdl == NULL)
 229                 return (NULL);
 230         return (fdl->nconf);
 231 }