1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)check_bound.c 1.15 93/07/05 SMI; 1.11 89/04/21 Copyr 1989 Sun Micro 30 * $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ 31 * $FreeBSD: src/usr.sbin/rpcbind/check_bound.c,v 1.5 2007/11/07 10:53:39 kevlo Exp $ 32 */ 33 /* 34 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. 35 */ 36 37 /* 38 * check_bound.c 39 * Checks to see whether the program is still bound to the 40 * claimed address and returns the univeral merged address 41 * 42 */ 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <rpc/rpc.h> 47 #include <stdio.h> 48 #include <netconfig.h> 49 #include <syslog.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include <stdlib.h> 53 54 #include "rpcbind.h" 55 56 struct fdlist { 57 int fd; 58 struct netconfig *nconf; 59 struct fdlist *next; 60 int check_binding; 61 }; 62 63 static struct fdlist *fdhead; /* Link list of the check fd's */ 64 static struct fdlist *fdtail; 65 static char *nullstring = ""; 66 67 static bool_t check_bound(struct fdlist *, char *uaddr); 68 69 /* 70 * Returns 1 if the given address is bound for the given addr & transport 71 * For all error cases, we assume that the address is bound 72 * Returns 0 for success. 73 */ 74 static bool_t 75 check_bound(struct fdlist *fdl, char *uaddr) 76 { 77 int fd; 78 struct netbuf *na; 79 int ans; 80 81 if (fdl->check_binding == FALSE) 82 return (TRUE); 83 84 na = uaddr2taddr(fdl->nconf, uaddr); 85 if (!na) 86 return (TRUE); /* punt, should never happen */ 87 88 fd = __rpc_nconf2fd(fdl->nconf); 89 if (fd < 0) { 90 free(na->buf); 91 free(na); 92 return (TRUE); 93 } 94 95 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 96 97 close(fd); 98 free(na->buf); 99 free(na); 100 101 return (ans == 0 ? FALSE : TRUE); 102 } 103 104 int 105 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused) 106 { 107 struct fdlist *fdl; 108 struct netconfig *newnconf; 109 110 newnconf = getnetconfigent(nconf->nc_netid); 111 if (newnconf == NULL) 112 return (-1); 113 fdl = malloc(sizeof (struct fdlist)); 114 if (fdl == NULL) { 115 freenetconfigent(newnconf); 116 syslog(LOG_ERR, "no memory!"); 117 return (-1); 118 } 119 fdl->nconf = newnconf; 120 fdl->next = NULL; 121 if (fdhead == NULL) { 122 fdhead = fdl; 123 fdtail = fdl; 124 } else { 125 fdtail->next = fdl; 126 fdtail = fdl; 127 } 128 /* XXX no bound checking for now */ 129 fdl->check_binding = FALSE; 130 131 return 0; 132 } 133 134 bool_t 135 is_bound(char *netid, char *uaddr) 136 { 137 struct fdlist *fdl; 138 139 for (fdl = fdhead; fdl; fdl = fdl->next) 140 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 141 break; 142 if (fdl == NULL) 143 return (TRUE); 144 return (check_bound(fdl, uaddr)); 145 } 146 147 /* 148 * Returns NULL if there was some system error. 149 * Returns "" if the address was not bound, i.e the server crashed. 150 * Returns the merged address otherwise. 151 */ 152 char * 153 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 154 { 155 struct fdlist *fdl; 156 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 157 158 for (fdl = fdhead; fdl; fdl = fdl->next) 159 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 160 break; 161 if (fdl == NULL) 162 return (NULL); 163 if (check_bound(fdl, uaddr) == FALSE) 164 /* that server died */ 165 return (nullstring); 166 /* 167 * If saddr is not NULL, the remote client may have included the 168 * address by which it contacted us. Use that for the "client" uaddr, 169 * otherwise use the info from the SVCXPRT. 170 */ 171 if (saddr != NULL) { 172 c_uaddr = saddr; 173 } else { 174 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 175 if (c_uaddr == NULL) { 176 syslog(LOG_ERR, "taddr2uaddr failed for %s", 177 fdl->nconf->nc_netid); 178 return (NULL); 179 } 180 allocated_uaddr = c_uaddr; 181 } 182 183 #ifdef ND_DEBUG 184 if (debugging) { 185 if (saddr == NULL) { 186 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 187 c_uaddr); 188 } else { 189 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 190 c_uaddr); 191 } 192 } 193 #endif 194 s_uaddr = uaddr; 195 /* 196 * This is all we should need for IP 4 and 6 197 */ 198 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 199 #ifdef ND_DEBUG 200 if (debugging) 201 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 202 uaddr, m_uaddr); 203 #endif 204 if (allocated_uaddr != NULL) 205 free(allocated_uaddr); 206 return (m_uaddr); 207 } 208 209 /* 210 * Returns a netconf structure from its internal list. This 211 * structure should not be freed. 212 */ 213 struct netconfig * 214 rpcbind_get_conf(char *netid) 215 { 216 struct fdlist *fdl; 217 218 for (fdl = fdhead; fdl; fdl = fdl->next) 219 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 220 break; 221 if (fdl == NULL) 222 return (NULL); 223 return (fdl->nconf); 224 } 225