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 <rpc/svc_dg.h> 54 #include <stdio.h> 55 #include <netconfig.h> 56 #include <syslog.h> 57 #include <string.h> 58 #include <unistd.h> 59 #include <stdlib.h> 60 61 #include "rpcbind.h" 62 63 struct fdlist { 64 int fd; 65 struct netconfig *nconf; 66 struct fdlist *next; 67 int check_binding; 68 }; 69 70 static struct fdlist *fdhead; /* Link list of the check fd's */ 71 static struct fdlist *fdtail; 72 static char *nullstring = ""; 73 74 static bool_t check_bound(struct fdlist *, char *uaddr); 75 76 /* 77 * Returns 1 if the given address is bound for the given addr & transport 78 * For all error cases, we assume that the address is bound 79 * Returns 0 for success. 80 */ 81 static bool_t 82 check_bound(struct fdlist *fdl, char *uaddr) 83 { 84 int fd; 85 struct netbuf *na; 86 int ans; 87 88 if (fdl->check_binding == FALSE) 89 return (TRUE); 90 91 na = uaddr2taddr(fdl->nconf, uaddr); 92 if (!na) 93 return (TRUE); /* punt, should never happen */ 94 95 fd = __rpc_nconf2fd(fdl->nconf); 96 if (fd < 0) { 97 free(na->buf); 98 free(na); 99 return (TRUE); 100 } 101 102 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 103 104 close(fd); 105 free(na->buf); 106 free(na); 107 108 return (ans == 0 ? FALSE : TRUE); 109 } 110 111 int 112 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused) 113 { 114 struct fdlist *fdl; 115 struct netconfig *newnconf; 116 117 newnconf = getnetconfigent(nconf->nc_netid); 118 if (newnconf == NULL) 119 return (-1); 120 fdl = malloc(sizeof (struct fdlist)); 121 if (fdl == NULL) { 122 freenetconfigent(newnconf); 123 syslog(LOG_ERR, "no memory!"); 124 return (-1); 125 } 126 fdl->nconf = newnconf; 127 fdl->next = NULL; 128 if (fdhead == NULL) { 129 fdhead = fdl; 130 fdtail = fdl; 131 } else { 132 fdtail->next = fdl; 133 fdtail = fdl; 134 } 135 /* XXX no bound checking for now */ 136 fdl->check_binding = FALSE; 137 138 return 0; 139 } 140 141 bool_t 142 is_bound(char *netid, char *uaddr) 143 { 144 struct fdlist *fdl; 145 146 for (fdl = fdhead; fdl; fdl = fdl->next) 147 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 148 break; 149 if (fdl == NULL) 150 return (TRUE); 151 return (check_bound(fdl, uaddr)); 152 } 153 154 /* 155 * Returns NULL if there was some system error. 156 * Returns "" if the address was not bound, i.e the server crashed. 157 * Returns the merged address otherwise. 158 */ 159 char * 160 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 161 { 162 struct fdlist *fdl; 163 struct svc_dg_data *dg_data; 164 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 165 166 for (fdl = fdhead; fdl; fdl = fdl->next) 167 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 168 break; 169 if (fdl == NULL) 170 return (NULL); 171 if (check_bound(fdl, uaddr) == FALSE) 172 /* that server died */ 173 return (nullstring); 174 /* 175 * Try to determine the local address on which the client contacted us, 176 * so we can send a reply from the same address. If it's unknown, then 177 * try to determine which address the client used, and pick a nearby 178 * local address. 179 * 180 * If saddr is not NULL, the remote client may have included the 181 * address by which it contacted us. Use that for the "client" uaddr, 182 * otherwise use the info from the SVCXPRT. 183 */ 184 dg_data = (struct svc_dg_data*)xprt->xp_p2; 185 if (dg_data != NULL && dg_data->su_srcaddr.buf != NULL) { 186 c_uaddr = taddr2uaddr(fdl->nconf, &dg_data->su_srcaddr); 187 allocated_uaddr = c_uaddr; 188 } 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