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warmstart.c revision 1.1.4.2 
      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 <rpc/rpc.h>
     42 #include <rpc/rpcb_prot.h>
     43 #include <rpc/xdr.h>
     44 #ifdef PORTMAP
     45 #include <netinet/in.h>
     46 #include <rpc/pmap_prot.h>
     47 #endif
     48 #include <syslog.h>
     49 #include <unistd.h>
     50 
     51 #include "rpcbind.h"
     52 
     53 /*
     54  * XXX this code is unsafe and is not used. It should be made safe.
     55  */
     56 
     57 
     58 /* These files keep the pmap_list and rpcb_list in XDR format */
     59 #define	RPCBFILE	"/tmp/rpcbind.file"
     60 #ifdef PORTMAP
     61 #define	PMAPFILE	"/tmp/portmap.file"
     62 #endif
     63 
     64 static bool_t write_struct __P((char *, xdrproc_t, void *));
     65 static bool_t read_struct __P((char *, xdrproc_t, void *));
     66 
     67 static bool_t
     68 write_struct(char *filename, xdrproc_t structproc, void *list)
     69 {
     70 	FILE *fp;
     71 	XDR xdrs;
     72 	mode_t omask;
     73 
     74 	omask = umask(077);
     75 	fp = fopen(filename, "w");
     76 	if (fp == NULL) {
     77 		int i;
     78 
     79 		for (i = 0; i < 10; i++)
     80 			close(i);
     81 		fp = fopen(filename, "w");
     82 		if (fp == NULL) {
     83 			syslog(LOG_ERR,
     84 				"cannot open file = %s for writing", filename);
     85 			syslog(LOG_ERR, "cannot save any registration");
     86 			return (FALSE);
     87 		}
     88 	}
     89 	(void) umask(omask);
     90 	xdrstdio_create(&xdrs, fp, XDR_ENCODE);
     91 
     92 	if (structproc(&xdrs, list) == FALSE) {
     93 		syslog(LOG_ERR, "rpcbind: xdr_%s: failed", filename);
     94 		fclose(fp);
     95 		return (FALSE);
     96 	}
     97 	XDR_DESTROY(&xdrs);
     98 	fclose(fp);
     99 	return (TRUE);
    100 }
    101 
    102 static bool_t
    103 read_struct(char *filename, xdrproc_t structproc, void *list)
    104 {
    105 	FILE *fp;
    106 	XDR xdrs;
    107 	struct stat sbuf;
    108 
    109 	if (stat(filename, &sbuf) != 0) {
    110 		fprintf(stderr,
    111 		"rpcbind: cannot stat file = %s for reading\n", filename);
    112 		goto error;
    113 	}
    114 	if ((sbuf.st_uid != 0) || (sbuf.st_mode & S_IRWXG) ||
    115 	    (sbuf.st_mode & S_IRWXO)) {
    116 		fprintf(stderr,
    117 		"rpcbind: invalid permissions on file = %s for reading\n",
    118 			filename);
    119 		goto error;
    120 	}
    121 	fp = fopen(filename, "r");
    122 	if (fp == NULL) {
    123 		fprintf(stderr,
    124 		"rpcbind: cannot open file = %s for reading\n", filename);
    125 		goto error;
    126 	}
    127 	xdrstdio_create(&xdrs, fp, XDR_DECODE);
    128 
    129 	if (structproc(&xdrs, list) == FALSE) {
    130 		fprintf(stderr, "rpcbind: xdr_%s: failed\n", filename);
    131 		fclose(fp);
    132 		goto error;
    133 	}
    134 	XDR_DESTROY(&xdrs);
    135 	fclose(fp);
    136 	return (TRUE);
    137 
    138 error:	fprintf(stderr, "rpcbind: will start from scratch\n");
    139 	return (FALSE);
    140 }
    141 
    142 void
    143 write_warmstart()
    144 {
    145 	(void) write_struct(RPCBFILE, xdr_rpcblist_ptr, &list_rbl);
    146 #ifdef PORTMAP
    147 	(void) write_struct(PMAPFILE, xdr_pmaplist_ptr, &list_pml);
    148 #endif
    149 
    150 }
    151 
    152 void
    153 read_warmstart()
    154 {
    155 	rpcblist_ptr tmp_rpcbl = NULL;
    156 #ifdef PORTMAP
    157 	struct pmaplist *tmp_pmapl = NULL;
    158 #endif
    159 	int ok1, ok2 = TRUE;
    160 
    161 	ok1 = read_struct(RPCBFILE, xdr_rpcblist_ptr, &tmp_rpcbl);
    162 	if (ok1 == FALSE)
    163 		return;
    164 #ifdef PORTMAP
    165 	ok2 = read_struct(PMAPFILE, xdr_pmaplist_ptr, &tmp_pmapl);
    166 #endif
    167 	if (ok2 == FALSE) {
    168 		xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&tmp_rpcbl);
    169 		return;
    170 	}
    171 	xdr_free((xdrproc_t) xdr_rpcblist_ptr, (char *)&list_rbl);
    172 	list_rbl = tmp_rpcbl;
    173 #ifdef PORTMAP
    174 	xdr_free((xdrproc_t) xdr_pmaplist_ptr, (char *)&list_pml);
    175 	list_pml = tmp_pmapl;
    176 #endif
    177 }
    178