1 /* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */ 2 /* $FreeBSD$ */ 3 4 /* 5 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 6 * unrestricted use provided that this legend is included on all tape 7 * media and as a part of the software program in whole or part. Users 8 * may copy or modify Sun RPC without charge, but are not authorized 9 * to license or distribute it to anyone else except as part of a product or 10 * program developed by the user. 11 * 12 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 13 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 14 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 15 * 16 * Sun RPC is provided with no support and without any obligation on the 17 * part of Sun Microsystems, Inc. to assist in its use, correction, 18 * modification or enhancement. 19 * 20 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 21 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 22 * OR ANY PART THEREOF. 23 * 24 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 25 * or profits or other special, indirect and consequential damages, even if 26 * Sun has been advised of the possibility of such damages. 27 * 28 * Sun Microsystems, Inc. 29 * 2550 Garcia Avenue 30 * Mountain View, California 94043 31 */ 32 /* 33 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. 34 */ 35 36 /* #ident "@(#)check_bound.c 1.15 93/07/05 SMI" */ 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)check_bound.c 1.11 89/04/21 Copyr 1989 Sun Micro"; 41 #endif 42 #endif 43 44 /* 45 * check_bound.c 46 * Checks to see whether the program is still bound to the 47 * claimed address and returns the universal merged address 48 * 49 */ 50 51 #include <sys/types.h> 52 #include <sys/socket.h> 53 #include <rpc/rpc.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 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 164 165 for (fdl = fdhead; fdl; fdl = fdl->next) 166 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 167 break; 168 if (fdl == NULL) 169 return (NULL); 170 if (check_bound(fdl, uaddr) == FALSE) 171 /* that server died */ 172 return (nullstring); 173 /* 174 * If saddr is not NULL, the remote client may have included the 175 * address by which it contacted us. Use that for the "client" uaddr, 176 * otherwise use the info from the SVCXPRT. 177 */ 178 if (saddr != NULL) { 179 c_uaddr = saddr; 180 } else { 181 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 182 if (c_uaddr == NULL) { 183 syslog(LOG_ERR, "taddr2uaddr failed for %s", 184 fdl->nconf->nc_netid); 185 return (NULL); 186 } 187 allocated_uaddr = c_uaddr; 188 } 189 190 #ifdef ND_DEBUG 191 if (debugging) { 192 if (saddr == NULL) { 193 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 194 c_uaddr); 195 } else { 196 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 197 c_uaddr); 198 } 199 } 200 #endif 201 s_uaddr = uaddr; 202 /* 203 * This is all we should need for IP 4 and 6 204 */ 205 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 206 #ifdef ND_DEBUG 207 if (debugging) 208 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 209 uaddr, m_uaddr); 210 #endif 211 if (allocated_uaddr != NULL) 212 free(allocated_uaddr); 213 return (m_uaddr); 214 } 215 216 /* 217 * Returns a netconf structure from its internal list. This 218 * structure should not be freed. 219 */ 220 struct netconfig * 221 rpcbind_get_conf(char *netid) 222 { 223 struct fdlist *fdl; 224 225 for (fdl = fdhead; fdl; fdl = fdl->next) 226 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 227 break; 228 if (fdl == NULL) 229 return (NULL); 230 return (fdl->nconf); 231 } 232