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warmstart.c revision 1.2 
      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 
     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(const char *, xdrproc_t, void *);
     67 static bool_t read_struct(const char *, xdrproc_t, void *);
     68 
     69 static bool_t
     70 write_struct(const char *filename, xdrproc_t structproc, void *list)
     71 {
     72 	FILE *fp;
     73 	int fd;
     74 	XDR xdrs;
     75 
     76 	fd = open(filename, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
     77 	if (fd == -1 || (fp = fdopen(fd, "r+")) == NULL) {
     78 		syslog(LOG_ERR, "Cannot open `%s' (%m)", filename);
     79 		syslog(LOG_ERR, "Cannot save any registration");
     80 		return FALSE;
     81 	}
     82 
     83 	xdrstdio_create(&xdrs, fp, XDR_ENCODE);
     84 
     85 	if (structproc(&xdrs, list) == FALSE) {
     86 		syslog(LOG_ERR, "xdr_%s: failed", filename);
     87 		(void)fclose(fp);
     88 		return (FALSE);
     89 	}
     90 	XDR_DESTROY(&xdrs);
     91 	(void)fclose(fp);
     92 	return TRUE;
     93 }
     94 
     95 static bool_t
     96 read_struct(const char *filename, xdrproc_t structproc, void *list)
     97 {
     98 	FILE *fp;
     99 	XDR xdrs;
    100 	struct stat sbuf;
    101 
    102 	if (stat(filename, &sbuf) != 0) {
    103 		warn("Cannot stat `%s'", filename);
    104 		goto error;
    105 	}
    106 	if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
    107 	    (sbuf.st_mode & S_IRWXO)) {
    108 		warnx("Invalid permissions on `%s'", filename);
    109 		goto error;
    110 	}
    111 	fp = fopen(filename, "r");
    112 	if (fp == NULL) {
    113 		warn("cannot open `%s'", filename);
    114 		goto error;
    115 	}
    116 	xdrstdio_create(&xdrs, fp, XDR_DECODE);
    117 
    118 	if (structproc(&xdrs, list) == FALSE) {
    119 		warnx("xdr_%s failed", filename);
    120 		(void)fclose(fp);
    121 		goto error;
    122 	}
    123 	XDR_DESTROY(&xdrs);
    124 	(void)fclose(fp);
    125 	return TRUE;
    126 
    127 error:	warnx("Will start from scratch");
    128 	return FALSE;
    129 }
    130 
    131 void
    132 write_warmstart(void)
    133 {
    134 	(void)write_struct(RPCBFILE, xdr_rpcblist_ptr, &list_rbl);
    135 #ifdef PORTMAP
    136 	(void)write_struct(PMAPFILE, xdr_pmaplist_ptr, &list_pml);
    137 #endif
    138 
    139 }
    140 
    141 void
    142 read_warmstart(void)
    143 {
    144 	rpcblist_ptr tmp_rpcbl = NULL;
    145 #ifdef PORTMAP
    146 	struct pmaplist *tmp_pmapl = NULL;
    147 #endif
    148 	int ok1, ok2 = TRUE;
    149 
    150 	ok1 = read_struct(RPCBFILE, xdr_rpcblist_ptr, &tmp_rpcbl);
    151 	if (ok1 == FALSE)
    152 		return;
    153 #ifdef PORTMAP
    154 	ok2 = read_struct(PMAPFILE, xdr_pmaplist_ptr, &tmp_pmapl);
    155 #endif
    156 	if (ok2 == FALSE) {
    157 		xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
    158 		return;
    159 	}
    160 	xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
    161 	list_rbl = tmp_rpcbl;
    162 #ifdef PORTMAP
    163 	xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
    164 	list_pml = tmp_pmapl;
    165 #endif
    166 }
    167