1 /* $NetBSD: check_bound.c,v 1.7 2017/08/16 08:44:40 christos Exp $ */ 2 /* $FreeBSD: head/usr.sbin/rpcbind/check_bound.c 300942 2016-05-29 06:01:18Z ngie $ */ 3 4 /*- 5 * Copyright (c) 2009, Sun Microsystems, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * - Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * - Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * - Neither the name of Sun Microsystems, Inc. nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 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 39 static 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 universal 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 #ifdef RPCBIND_RUMP 61 #include <rump/rump.h> 62 #include <rump/rump_syscalls.h> 63 #endif 64 65 #include "rpcbind.h" 66 67 struct fdlist { 68 int fd; 69 struct netconfig *nconf; 70 struct fdlist *next; 71 int check_binding; 72 }; 73 74 static struct fdlist *fdhead; /* Link list of the check fd's */ 75 static struct fdlist *fdtail; 76 static char nullstring[] = ""; 77 78 static bool_t check_bound(struct fdlist *, const char *uaddr); 79 80 /* 81 * Returns 1 if the given address is bound for the given addr & transport 82 * For all error cases, we assume that the address is bound 83 * Returns 0 for success. 84 */ 85 static bool_t 86 check_bound(struct fdlist *fdl, const char *uaddr) 87 { 88 int fd; 89 struct netbuf *na; 90 int ans; 91 92 if (fdl->check_binding == FALSE) 93 return (TRUE); 94 95 na = uaddr2taddr(fdl->nconf, uaddr); 96 if (!na) 97 return (TRUE); /* punt, should never happen */ 98 99 fd = __rpc_nconf2fd(fdl->nconf); 100 if (fd < 0) { 101 free(na->buf); 102 free(na); 103 return (TRUE); 104 } 105 106 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 107 108 #ifdef RPCBIND_RUMP 109 rump_sys_close(fd); 110 #else 111 close(fd); 112 #endif 113 free(na->buf); 114 free(na); 115 116 return (ans == 0 ? FALSE : TRUE); 117 } 118 119 int 120 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused) 121 { 122 struct fdlist *fdl; 123 struct netconfig *newnconf; 124 125 newnconf = getnetconfigent(nconf->nc_netid); 126 if (newnconf == NULL) 127 return (-1); 128 fdl = malloc(sizeof(struct fdlist)); 129 if (fdl == NULL) { 130 freenetconfigent(newnconf); 131 syslog(LOG_ERR, "no memory!"); 132 return (-1); 133 } 134 fdl->nconf = newnconf; 135 fdl->next = NULL; 136 if (fdhead == NULL) { 137 fdhead = fdl; 138 fdtail = fdl; 139 } else { 140 fdtail->next = fdl; 141 fdtail = fdl; 142 } 143 /* XXX no bound checking for now */ 144 fdl->check_binding = FALSE; 145 146 return 0; 147 } 148 149 bool_t 150 is_bound(const char *netid, const char *uaddr) 151 { 152 struct fdlist *fdl; 153 154 for (fdl = fdhead; fdl; fdl = fdl->next) 155 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 156 break; 157 if (fdl == NULL) 158 return (TRUE); 159 return (check_bound(fdl, uaddr)); 160 } 161 162 /* 163 * Returns NULL if there was some system error. 164 * Returns "" if the address was not bound, i.e the server crashed. 165 * Returns the merged address otherwise. 166 */ 167 char * 168 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 169 { 170 struct fdlist *fdl; 171 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 172 173 for (fdl = fdhead; fdl; fdl = fdl->next) 174 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 175 break; 176 if (fdl == NULL) 177 return (NULL); 178 if (check_bound(fdl, uaddr) == FALSE) 179 /* that server died */ 180 return nullstring; 181 /* 182 * Try to determine the local address on which the client contacted us, 183 * so we can send a reply from the same address. If it's unknown, then 184 * try to determine which address the client used, and pick a nearby 185 * local address. 186 * 187 * If saddr is not NULL, the remote client may have included the 188 * address by which it contacted us. Use that for the "client" uaddr, 189 * otherwise use the info from the SVCXPRT. 190 */ 191 if (xprt->xp_rtaddr.buf != NULL) { 192 c_uaddr = taddr2uaddr(fdl->nconf, &xprt->xp_rtaddr); 193 allocated_uaddr = c_uaddr; 194 } else if (saddr != NULL) { 195 c_uaddr = saddr; 196 } else { 197 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 198 allocated_uaddr = c_uaddr; 199 } 200 if (c_uaddr == NULL) { 201 syslog(LOG_ERR, "taddr2uaddr failed for %s", 202 fdl->nconf->nc_netid); 203 return (NULL); 204 } 205 206 #ifdef RPCBIND_DEBUG 207 if (debugging) { 208 if (saddr == NULL) { 209 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 210 c_uaddr); 211 } else { 212 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 213 c_uaddr); 214 } 215 } 216 #endif 217 s_uaddr = uaddr; 218 /* 219 * This is all we should need for IP 4 and 6 220 */ 221 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 222 #ifdef RPCBIND_DEBUG 223 if (debugging) 224 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 225 uaddr, m_uaddr); 226 #endif 227 free(allocated_uaddr); 228 return (m_uaddr); 229 } 230 231 /* 232 * Returns a netconf structure from its internal list. This 233 * structure should not be freed. 234 */ 235 struct netconfig * 236 rpcbind_get_conf(const char *netid) 237 { 238 struct fdlist *fdl; 239 240 for (fdl = fdhead; fdl; fdl = fdl->next) 241 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 242 break; 243 if (fdl == NULL) 244 return (NULL); 245 return (fdl->nconf); 246 } 247