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