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