1/* $NetBSD: check_bound.c,v 1.1 2010/07/26 15:53:00 pooka Exp $ */ 2 3/* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31/* 32 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. 33 */ 34 35/* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */ 36 37#if 0 38#ifndef lint 39static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro"; 40#endif 41#endif 42 43/* 44 * check_bound.c 45 * Checks to see whether the program is still bound to the 46 * claimed address and returns the univeral merged address 47 * 48 */ 49 50#include <sys/types.h> 51#include <sys/socket.h> 52#include <rpc/rpc.h> 53#include <stdio.h> 54#include <netconfig.h> 55#include <syslog.h> 56#include <string.h> 57#include <unistd.h> 58#include <stdlib.h> 59 60#include <rump/rump.h> 61#include <rump/rump_syscalls.h> 62 63#include "rpcbind.h" 64 65struct fdlist { 66 int fd; 67 struct netconfig *nconf; 68 struct fdlist *next; 69 int check_binding; 70}; 71 72static struct fdlist *fdhead; /* Link list of the check fd's */ 73static struct fdlist *fdtail; 74static const char emptystring[] = ""; 75 76static bool_t check_bound(struct fdlist *, const char *uaddr); 77 78/* 79 * Returns 1 if the given address is bound for the given addr & transport 80 * For all error cases, we assume that the address is bound 81 * Returns 0 for success. 82 */ 83static bool_t 84check_bound(struct fdlist *fdl, const char *uaddr) 85{ 86 int fd; 87 struct netbuf *na; 88 int ans; 89 90 if (fdl->check_binding == FALSE) 91 return (TRUE); 92 93 na = uaddr2taddr(fdl->nconf, uaddr); 94 if (!na) 95 return (TRUE); /* punt, should never happen */ 96 97 fd = __rpc_nconf2fd(fdl->nconf); 98 if (fd < 0) { 99 free(na); 100 return (TRUE); 101 } 102 103 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 104 105 rump_sys_close(fd); 106 free(na); 107 108 return (ans == 0 ? FALSE : TRUE); 109} 110 111int 112add_bndlist(struct netconfig *nconf, struct netbuf *baddr) 113{ 114 struct fdlist *fdl; 115 struct netconfig *newnconf; 116 117 newnconf = getnetconfigent(nconf->nc_netid); 118 if (newnconf == NULL) 119 return (-1); 120 fdl = (struct fdlist *)malloc((u_int)sizeof (struct fdlist)); 121 if (fdl == NULL) { 122 freenetconfigent(newnconf); 123 syslog(LOG_ERR, "no memory!"); 124 return (-1); 125 } 126 fdl->nconf = newnconf; 127 fdl->next = NULL; 128 if (fdhead == NULL) { 129 fdhead = fdl; 130 fdtail = fdl; 131 } else { 132 fdtail->next = fdl; 133 fdtail = fdl; 134 } 135 /* XXX no bound checking for now */ 136 fdl->check_binding = FALSE; 137 138 return 0; 139} 140 141bool_t 142is_bound(const char *netid, const char *uaddr) 143{ 144 struct fdlist *fdl; 145 146 for (fdl = fdhead; fdl; fdl = fdl->next) 147 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 148 break; 149 if (fdl == NULL) 150 return (TRUE); 151 return (check_bound(fdl, uaddr)); 152} 153 154/* 155 * Returns NULL if there was some system error. 156 * Returns "" if the address was not bound, i.e the server crashed. 157 * Returns the merged address otherwise. 158 */ 159char * 160mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 161{ 162 struct fdlist *fdl; 163 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 164 165 for (fdl = fdhead; fdl; fdl = fdl->next) 166 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 167 break; 168 if (fdl == NULL) 169 return (NULL); 170 if (check_bound(fdl, uaddr) == FALSE) 171 /* that server died */ 172 return strdup(emptystring); 173 /* 174 * If saddr is not NULL, the remote client may have included the 175 * address by which it contacted us. Use that for the "client" uaddr, 176 * otherwise use the info from the SVCXPRT. 177 */ 178 if (saddr != NULL) { 179 c_uaddr = saddr; 180 } else { 181 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 182 if (c_uaddr == NULL) { 183 syslog(LOG_ERR, "taddr2uaddr failed for %s", 184 fdl->nconf->nc_netid); 185 return (NULL); 186 } 187 allocated_uaddr = c_uaddr; 188 } 189 190#ifdef RPCBIND_DEBUG 191 if (debugging) { 192 if (saddr == NULL) { 193 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 194 c_uaddr); 195 } else { 196 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 197 c_uaddr); 198 } 199 } 200#endif 201 s_uaddr = uaddr; 202 /* 203 * This is all we should need for IP 4 and 6 204 */ 205 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 206#ifdef RPCBIND_DEBUG 207 if (debugging) 208 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 209 uaddr, m_uaddr); 210#endif 211 if (allocated_uaddr != NULL) 212 free(allocated_uaddr); 213 return (m_uaddr); 214} 215 216/* 217 * Returns a netconf structure from its internal list. This 218 * structure should not be freed. 219 */ 220struct netconfig * 221rpcbind_get_conf(const char *netid) 222{ 223 struct fdlist *fdl; 224 225 for (fdl = fdhead; fdl; fdl = fdl->next) 226 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 227 break; 228 if (fdl == NULL) 229 return (NULL); 230 return (fdl->nconf); 231} 232