usr.sbin/rpcbind/warmstart.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  * warmstart.c
  31  * Allows for gathering of registrations from an earlier dumped file.
  32  *
  33  * Copyright (c) 1990 by Sun Microsystems, Inc.
  34  */
  35
  36 /*
  37  * @(#)warmstart.c      1.7     93/07/05 SMI
  38  * $FreeBSD: src/usr.sbin/rpcbind/warmstart.c,v 1.4 2007/11/07 10:53:39 kevlo Exp $
  39  * $DragonFly$
  40  */
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <stdio.h>
  44 #include <rpc/rpc.h>
  45 #include <rpc/rpcb_prot.h>
  46 #include <rpc/xdr.h>
  47 #ifdef PORTMAP
  48 #include <netinet/in.h>
  49 #include <rpc/pmap_prot.h>
  50 #endif
  51 #include <syslog.h>
  52 #include <unistd.h>
  53
  54 #include "rpcbind.h"
  55
  56 /*
  57  * XXX this code is unsafe and is not used. It should be made safe.
  58  */
  59
  60
  61 /* These files keep the pmap_list and rpcb_list in XDR format */
  62 #define RPCBFILE        "/tmp/rpcbind.file"
  63 #ifdef PORTMAP
  64 #define PMAPFILE        "/tmp/portmap.file"
  65 #endif
  66
  67 static bool_t write_struct(char *, xdrproc_t, void *);
  68 static bool_t read_struct(char *, xdrproc_t, void *);
  69
  70 static bool_t
  71 write_struct(char *filename, xdrproc_t structproc, void *list)
  72 {
  73         FILE *fp;
  74         XDR xdrs;
  75         mode_t omask;
  76
  77         omask = umask(077);
  78         fp = fopen(filename, "w");
  79         if (fp == NULL) {
  80                 int i;
  81
  82                 for (i = 0; i < 10; i++)
  83                         close(i);
  84                 fp = fopen(filename, "w");
  85                 if (fp == NULL) {
  86                         syslog(LOG_ERR,
  87                                 "cannot open file = %s for writing", filename);
  88                         syslog(LOG_ERR, "cannot save any registration");
  89                         return (FALSE);
  90                 }
  91         }
  92         umask(omask);
  93         xdrstdio_create(&xdrs, fp, XDR_ENCODE);
  94
  95         if (structproc(&xdrs, list) == FALSE) {
  96                 syslog(LOG_ERR, "rpcbind: xdr_%s: failed", filename);
  97                 fclose(fp);
  98                 return (FALSE);
  99         }
 100         XDR_DESTROY(&xdrs);
 101         fclose(fp);
 102         return (TRUE);
 103 }
 104
 105 static bool_t
 106 read_struct(char *filename, xdrproc_t structproc, void *list)
 107 {
 108         FILE *fp;
 109         XDR xdrs;
 110         struct stat sbuf;
 111
 112         if (stat(filename, &sbuf) != 0) {
 113                 fprintf(stderr,
 114                 "rpcbind: cannot stat file = %s for reading\n", filename);
 115                 goto error;
 116         }
 117         if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
 118             (sbuf.st_mode & S_IRWXO)) {
 119                 fprintf(stderr,
 120                 "rpcbind: invalid permissions on file = %s for reading\n",
 121                         filename);
 122                 goto error;
 123         }
 124         fp = fopen(filename, "r");
 125         if (fp == NULL) {
 126                 fprintf(stderr,
 127                 "rpcbind: cannot open file = %s for reading\n", filename);
 128                 goto error;
 129         }
 130         xdrstdio_create(&xdrs, fp, XDR_DECODE);
 131
 132         if (structproc(&xdrs, list) == FALSE) {
 133                 fprintf(stderr, "rpcbind: xdr_%s: failed\n", filename);
 134                 fclose(fp);
 135                 goto error;
 136         }
 137         XDR_DESTROY(&xdrs);
 138         fclose(fp);
 139         return (TRUE);
 140
 141 error:  fprintf(stderr, "rpcbind: will start from scratch\n");
 142         return (FALSE);
 143 }
 144
 145 void
 146 write_warmstart(void)
 147 {
 148         write_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &list_rbl);
 149 #ifdef PORTMAP
 150         write_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &list_pml);
 151 #endif
 152
 153 }
 154
 155 void
 156 read_warmstart(void)
 157 {
 158         rpcblist_ptr tmp_rpcbl = NULL;
 159 #ifdef PORTMAP
 160         struct pmaplist *tmp_pmapl = NULL;
 161 #endif
 162         int ok1, ok2 = TRUE;
 163
 164         ok1 = read_struct(RPCBFILE, (xdrproc_t)xdr_rpcblist_ptr, &tmp_rpcbl);
 165         if (ok1 == FALSE)
 166                 return;
 167 #ifdef PORTMAP
 168         ok2 = read_struct(PMAPFILE, (xdrproc_t)xdr_pmaplist_ptr, &tmp_pmapl);
 169 #endif
 170         if (ok2 == FALSE) {
 171                 xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
 172                 return;
 173         }
 174         xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
 175         list_rbl = tmp_rpcbl;
 176 #ifdef PORTMAP
 177         xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
 178         list_pml = tmp_pmapl;
 179 #endif
 180 }