1 /* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */ 2 /* $FreeBSD$ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-3-Clause 6 * 7 * Copyright (c) 2009, Sun Microsystems, Inc. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions are met: 12 * - Redistributions of source code must retain the above copyright notice, 13 * this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above copyright notice, 15 * this list of conditions and the following disclaimer in the documentation 16 * and/or other materials provided with the distribution. 17 * - Neither the name of Sun Microsystems, Inc. nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 /* 34 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. 35 */ 36 37 /* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */ 38 39 #if 0 40 #ifndef lint 41 static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro"; 42 #endif 43 #endif 44 45 /* 46 * check_bound.c 47 * Checks to see whether the program is still bound to the 48 * claimed address and returns the universal merged address 49 * 50 */ 51 52 #include <sys/types.h> 53 #include <sys/socket.h> 54 #include <rpc/rpc.h> 55 #include <rpc/svc_dg.h> 56 #include <netconfig.h> 57 #include <syslog.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <stdlib.h> 61 62 #include "rpcbind.h" 63 64 struct fdlist { 65 int fd; 66 struct netconfig *nconf; 67 struct fdlist *next; 68 int check_binding; 69 }; 70 71 static struct fdlist *fdhead; /* Link list of the check fd's */ 72 static struct fdlist *fdtail; 73 static char *nullstring = ""; 74 75 static bool_t check_bound(struct fdlist *, char *uaddr); 76 77 /* 78 * Returns 1 if the given address is bound for the given addr & transport 79 * For all error cases, we assume that the address is bound 80 * Returns 0 for success. 81 */ 82 static bool_t 83 check_bound(struct fdlist *fdl, char *uaddr) 84 { 85 int fd; 86 struct netbuf *na; 87 int ans; 88 89 if (fdl->check_binding == FALSE) 90 return (TRUE); 91 92 na = uaddr2taddr(fdl->nconf, uaddr); 93 if (!na) 94 return (TRUE); /* punt, should never happen */ 95 96 fd = __rpc_nconf2fd(fdl->nconf); 97 if (fd < 0) { 98 free(na->buf); 99 free(na); 100 return (TRUE); 101 } 102 103 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 104 105 close(fd); 106 free(na->buf); 107 free(na); 108 109 return (ans == 0 ? FALSE : TRUE); 110 } 111 112 int 113 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused) 114 { 115 struct fdlist *fdl; 116 struct netconfig *newnconf; 117 118 newnconf = getnetconfigent(nconf->nc_netid); 119 if (newnconf == NULL) 120 return (-1); 121 fdl = malloc(sizeof (struct fdlist)); 122 if (fdl == NULL) { 123 freenetconfigent(newnconf); 124 syslog(LOG_ERR, "no memory!"); 125 return (-1); 126 } 127 fdl->nconf = newnconf; 128 fdl->next = NULL; 129 if (fdhead == NULL) { 130 fdhead = fdl; 131 fdtail = fdl; 132 } else { 133 fdtail->next = fdl; 134 fdtail = fdl; 135 } 136 /* XXX no bound checking for now */ 137 fdl->check_binding = FALSE; 138 139 return 0; 140 } 141 142 bool_t 143 is_bound(char *netid, char *uaddr) 144 { 145 struct fdlist *fdl; 146 147 for (fdl = fdhead; fdl; fdl = fdl->next) 148 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 149 break; 150 if (fdl == NULL) 151 return (TRUE); 152 return (check_bound(fdl, uaddr)); 153 } 154 155 /* 156 * Returns NULL if there was some system error. 157 * Returns "" if the address was not bound, i.e the server crashed. 158 * Returns the merged address otherwise. 159 */ 160 char * 161 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 162 { 163 struct fdlist *fdl; 164 struct netbuf *callee; 165 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 166 167 for (fdl = fdhead; fdl; fdl = fdl->next) 168 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 169 break; 170 if (fdl == NULL) 171 return (NULL); 172 if (check_bound(fdl, uaddr) == FALSE) 173 /* that server died */ 174 return (nullstring); 175 /* 176 * Try to determine the local address on which the client contacted us, 177 * so we can send a reply from the same address. If it's unknown, then 178 * try to determine which address the client used, and pick a nearby 179 * local address. 180 * 181 * If saddr is not NULL, the remote client may have included the 182 * address by which it contacted us. Use that for the "client" uaddr, 183 * otherwise use the info from the SVCXPRT. 184 */ 185 callee = svc_getrpccallee(xprt); 186 if (callee != NULL && callee->buf != NULL) { 187 c_uaddr = taddr2uaddr(fdl->nconf, callee); 188 allocated_uaddr = c_uaddr; 189 } else if (saddr != NULL) { 190 c_uaddr = saddr; 191 } else { 192 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 193 allocated_uaddr = c_uaddr; 194 } 195 if (c_uaddr == NULL) { 196 syslog(LOG_ERR, "taddr2uaddr failed for %s", 197 fdl->nconf->nc_netid); 198 return (NULL); 199 } 200 201 #ifdef ND_DEBUG 202 if (debugging) { 203 if (saddr == NULL) { 204 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 205 c_uaddr); 206 } else { 207 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 208 c_uaddr); 209 } 210 } 211 #endif 212 s_uaddr = uaddr; 213 /* 214 * This is all we should need for IP 4 and 6 215 */ 216 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 217 #ifdef ND_DEBUG 218 if (debugging) 219 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 220 uaddr, m_uaddr); 221 #endif 222 free(allocated_uaddr); 223 return (m_uaddr); 224 } 225 226 /* 227 * Returns a netconf structure from its internal list. This 228 * structure should not be freed. 229 */ 230 struct netconfig * 231 rpcbind_get_conf(const char *netid) 232 { 233 struct fdlist *fdl; 234 235 for (fdl = fdhead; fdl; fdl = fdl->next) 236 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 237 break; 238 if (fdl == NULL) 239 return (NULL); 240 return (fdl->nconf); 241 } 242