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 a earlier dumped file.
  32  *
  33  * Copyright (c) 1990 by Sun Microsystems, Inc.
  34  */
  35
  36 #ident  "@(#)warmstart.c        1.7     93/07/05 SMI"
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <stdio.h>
  41 #include <fcntl.h>
  42 #include <err.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 #ifdef WARMSTART
  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(const char *, xdrproc_t, void *);
  68 static bool_t read_struct(const char *, xdrproc_t, void *);
  69
  70 static bool_t
  71 write_struct(const char *filename, xdrproc_t structproc, void *list)
  72 {
  73         FILE *fp;
  74         int fd;
  75         XDR xdrs;
  76
  77         (void)unlink(filename);
  78         fd = open(filename, O_WRONLY|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
  79         if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) {
  80                 syslog(LOG_ERR, "Cannot open `%s' (%m)", filename);
  81                 syslog(LOG_ERR, "Cannot save any registration");
  82                 return FALSE;
  83         }
  84
  85         xdrstdio_create(&xdrs, fp, XDR_ENCODE);
  86
  87         if (structproc(&xdrs, list) == FALSE) {
  88                 syslog(LOG_ERR, "xdr_%s: failed", filename);
  89                 (void)fclose(fp);
  90                 return (FALSE);
  91         }
  92         XDR_DESTROY(&xdrs);
  93         (void)fclose(fp);
  94         return TRUE;
  95 }
  96
  97 static bool_t
  98 read_struct(const char *filename, xdrproc_t structproc, void *list)
  99 {
 100         FILE *fp;
 101         XDR xdrs;
 102         struct stat sbuf;
 103
 104         if (stat(filename, &sbuf) != 0) {
 105                 warn("Cannot stat `%s'", filename);
 106                 goto error;
 107         }
 108         if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
 109             (sbuf.st_mode & S_IRWXO)) {
 110                 warnx("Invalid permissions on `%s'", filename);
 111                 goto error;
 112         }
 113         fp = fopen(filename, "r");
 114         if (fp == NULL) {
 115                 warn("cannot open `%s'", filename);
 116                 goto error;
 117         }
 118         xdrstdio_create(&xdrs, fp, XDR_DECODE);
 119
 120         if (structproc(&xdrs, list) == FALSE) {
 121                 warnx("xdr_%s failed", filename);
 122                 (void)fclose(fp);
 123                 goto error;
 124         }
 125         XDR_DESTROY(&xdrs);
 126         (void)fclose(fp);
 127         return TRUE;
 128
 129 error:  warnx("Will start from scratch");
 130         return FALSE;
 131 }
 132
 133 void
 134 write_warmstart(void)
 135 {
 136         (void)write_struct(RPCBFILE, xdr_rpcblist_ptr, &list_rbl);
 137 #ifdef PORTMAP
 138         (void)write_struct(PMAPFILE, xdr_pmaplist_ptr, &list_pml);
 139 #endif
 140
 141 }
 142
 143 void
 144 read_warmstart(void)
 145 {
 146         rpcblist_ptr tmp_rpcbl = NULL;
 147 #ifdef PORTMAP
 148         struct pmaplist *tmp_pmapl = NULL;
 149 #endif
 150         int ok1, ok2 = TRUE;
 151
 152         ok1 = read_struct(RPCBFILE, xdr_rpcblist_ptr, &tmp_rpcbl);
 153         if (ok1 == FALSE)
 154                 return;
 155 #ifdef PORTMAP
 156         ok2 = read_struct(PMAPFILE, xdr_pmaplist_ptr, &tmp_pmapl);
 157 #endif
 158         if (ok2 == FALSE) {
 159                 xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
 160                 return;
 161         }
 162         xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
 163         list_rbl = tmp_rpcbl;
 164 #ifdef PORTMAP
 165         xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
 166         list_pml = tmp_pmapl;
 167 #endif
 168 }
 169 #endif