1 /* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */ 2 /* $FreeBSD$ */ 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 #include "rpcbind.h" 61 62 struct fdlist { 63 int fd; 64 struct netconfig *nconf; 65 struct fdlist *next; 66 int check_binding; 67 }; 68 69 static struct fdlist *fdhead; /* Link list of the check fd's */ 70 static struct fdlist *fdtail; 71 static char *nullstring = ""; 72 73 static bool_t check_bound(struct fdlist *, char *uaddr); 74 75 /* 76 * Returns 1 if the given address is bound for the given addr & transport 77 * For all error cases, we assume that the address is bound 78 * Returns 0 for success. 79 */ 80 static bool_t 81 check_bound(struct fdlist *fdl, char *uaddr) 82 { 83 int fd; 84 struct netbuf *na; 85 int ans; 86 87 if (fdl->check_binding == FALSE) 88 return (TRUE); 89 90 na = uaddr2taddr(fdl->nconf, uaddr); 91 if (!na) 92 return (TRUE); /* punt, should never happen */ 93 94 fd = __rpc_nconf2fd(fdl->nconf); 95 if (fd < 0) { 96 free(na->buf); 97 free(na); 98 return (TRUE); 99 } 100 101 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 102 103 close(fd); 104 free(na->buf); 105 free(na); 106 107 return (ans == 0 ? FALSE : TRUE); 108 } 109 110 int 111 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused) 112 { 113 struct fdlist *fdl; 114 struct netconfig *newnconf; 115 116 newnconf = getnetconfigent(nconf->nc_netid); 117 if (newnconf == NULL) 118 return (-1); 119 fdl = malloc(sizeof (struct fdlist)); 120 if (fdl == NULL) { 121 freenetconfigent(newnconf); 122 syslog(LOG_ERR, "no memory!"); 123 return (-1); 124 } 125 fdl->nconf = newnconf; 126 fdl->next = NULL; 127 if (fdhead == NULL) { 128 fdhead = fdl; 129 fdtail = fdl; 130 } else { 131 fdtail->next = fdl; 132 fdtail = fdl; 133 } 134 /* XXX no bound checking for now */ 135 fdl->check_binding = FALSE; 136 137 return 0; 138 } 139 140 bool_t 141 is_bound(char *netid, char *uaddr) 142 { 143 struct fdlist *fdl; 144 145 for (fdl = fdhead; fdl; fdl = fdl->next) 146 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 147 break; 148 if (fdl == NULL) 149 return (TRUE); 150 return (check_bound(fdl, uaddr)); 151 } 152 153 /* 154 * Returns NULL if there was some system error. 155 * Returns "" if the address was not bound, i.e the server crashed. 156 * Returns the merged address otherwise. 157 */ 158 char * 159 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 160 { 161 struct fdlist *fdl; 162 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 163 164 for (fdl = fdhead; fdl; fdl = fdl->next) 165 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 166 break; 167 if (fdl == NULL) 168 return (NULL); 169 if (check_bound(fdl, uaddr) == FALSE) 170 /* that server died */ 171 return (nullstring); 172 /* 173 * If saddr is not NULL, the remote client may have included the 174 * address by which it contacted us. Use that for the "client" uaddr, 175 * otherwise use the info from the SVCXPRT. 176 */ 177 if (saddr != NULL) { 178 c_uaddr = saddr; 179 } else { 180 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 181 if (c_uaddr == NULL) { 182 syslog(LOG_ERR, "taddr2uaddr failed for %s", 183 fdl->nconf->nc_netid); 184 return (NULL); 185 } 186 allocated_uaddr = c_uaddr; 187 } 188 189 #ifdef ND_DEBUG 190 if (debugging) { 191 if (saddr == NULL) { 192 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 193 c_uaddr); 194 } else { 195 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 196 c_uaddr); 197 } 198 } 199 #endif 200 s_uaddr = uaddr; 201 /* 202 * This is all we should need for IP 4 and 6 203 */ 204 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 205 #ifdef ND_DEBUG 206 if (debugging) 207 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 208 uaddr, m_uaddr); 209 #endif 210 if (allocated_uaddr != NULL) 211 free(allocated_uaddr); 212 return (m_uaddr); 213 } 214 215 /* 216 * Returns a netconf structure from its internal list. This 217 * structure should not be freed. 218 */ 219 struct netconfig * 220 rpcbind_get_conf(char *netid) 221 { 222 struct fdlist *fdl; 223 224 for (fdl = fdhead; fdl; fdl = fdl->next) 225 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 226 break; 227 if (fdl == NULL) 228 return (NULL); 229 return (fdl->nconf); 230 } 231