1 /* 2 * Copyright (c) 2009, Sun Microsystems, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 * 28 * @(#)check_bound.c 1.15 93/07/05 SMI; 1.11 89/04/21 Copyr 1989 Sun Micro 29 * $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ 30 * $FreeBSD: src/usr.sbin/rpcbind/check_bound.c,v 1.5 2007/11/07 10:53:39 kevlo Exp $ 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 univeral merged address 40 * 41 */ 42 43 #include <sys/types.h> 44 #include <sys/socket.h> 45 #include <rpc/rpc.h> 46 #include <stdio.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 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 156 157 for (fdl = fdhead; fdl; fdl = fdl->next) 158 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 159 break; 160 if (fdl == NULL) 161 return (NULL); 162 if (check_bound(fdl, uaddr) == FALSE) 163 /* that server died */ 164 return (nullstring); 165 /* 166 * If saddr is not NULL, the remote client may have included the 167 * address by which it contacted us. Use that for the "client" uaddr, 168 * otherwise use the info from the SVCXPRT. 169 */ 170 if (saddr != NULL) { 171 c_uaddr = saddr; 172 } else { 173 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 174 if (c_uaddr == NULL) { 175 syslog(LOG_ERR, "taddr2uaddr failed for %s", 176 fdl->nconf->nc_netid); 177 return (NULL); 178 } 179 allocated_uaddr = c_uaddr; 180 } 181 182 #ifdef ND_DEBUG 183 if (debugging) { 184 if (saddr == NULL) { 185 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 186 c_uaddr); 187 } else { 188 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 189 c_uaddr); 190 } 191 } 192 #endif 193 s_uaddr = uaddr; 194 /* 195 * This is all we should need for IP 4 and 6 196 */ 197 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 198 #ifdef ND_DEBUG 199 if (debugging) 200 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 201 uaddr, m_uaddr); 202 #endif 203 if (allocated_uaddr != NULL) 204 free(allocated_uaddr); 205 return (m_uaddr); 206 } 207 208 /* 209 * Returns a netconf structure from its internal list. This 210 * structure should not be freed. 211 */ 212 struct netconfig * 213 rpcbind_get_conf(char *netid) 214 { 215 struct fdlist *fdl; 216 217 for (fdl = fdhead; fdl; fdl = fdl->next) 218 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 219 break; 220 if (fdl == NULL) 221 return (NULL); 222 return (fdl->nconf); 223 } 224