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 * $DragonFly$ 33 */ 34 /* 35 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. 36 */ 37 38 /* 39 * check_bound.c 40 * Checks to see whether the program is still bound to the 41 * claimed address and returns the univeral merged address 42 * 43 */ 44 45 #include <sys/types.h> 46 #include <sys/socket.h> 47 #include <rpc/rpc.h> 48 #include <stdio.h> 49 #include <netconfig.h> 50 #include <syslog.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include <stdlib.h> 54 55 #include "rpcbind.h" 56 57 struct fdlist { 58 int fd; 59 struct netconfig *nconf; 60 struct fdlist *next; 61 int check_binding; 62 }; 63 64 static struct fdlist *fdhead; /* Link list of the check fd's */ 65 static struct fdlist *fdtail; 66 static char *nullstring = ""; 67 68 static bool_t check_bound(struct fdlist *, char *uaddr); 69 70 /* 71 * Returns 1 if the given address is bound for the given addr & transport 72 * For all error cases, we assume that the address is bound 73 * Returns 0 for success. 74 */ 75 static bool_t 76 check_bound(struct fdlist *fdl, char *uaddr) 77 { 78 int fd; 79 struct netbuf *na; 80 int ans; 81 82 if (fdl->check_binding == FALSE) 83 return (TRUE); 84 85 na = uaddr2taddr(fdl->nconf, uaddr); 86 if (!na) 87 return (TRUE); /* punt, should never happen */ 88 89 fd = __rpc_nconf2fd(fdl->nconf); 90 if (fd < 0) { 91 free(na->buf); 92 free(na); 93 return (TRUE); 94 } 95 96 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 97 98 close(fd); 99 free(na->buf); 100 free(na); 101 102 return (ans == 0 ? FALSE : TRUE); 103 } 104 105 int 106 add_bndlist(struct netconfig *nconf, struct netbuf *baddr __unused) 107 { 108 struct fdlist *fdl; 109 struct netconfig *newnconf; 110 111 newnconf = getnetconfigent(nconf->nc_netid); 112 if (newnconf == NULL) 113 return (-1); 114 fdl = malloc(sizeof (struct fdlist)); 115 if (fdl == NULL) { 116 freenetconfigent(newnconf); 117 syslog(LOG_ERR, "no memory!"); 118 return (-1); 119 } 120 fdl->nconf = newnconf; 121 fdl->next = NULL; 122 if (fdhead == NULL) { 123 fdhead = fdl; 124 fdtail = fdl; 125 } else { 126 fdtail->next = fdl; 127 fdtail = fdl; 128 } 129 /* XXX no bound checking for now */ 130 fdl->check_binding = FALSE; 131 132 return 0; 133 } 134 135 bool_t 136 is_bound(char *netid, char *uaddr) 137 { 138 struct fdlist *fdl; 139 140 for (fdl = fdhead; fdl; fdl = fdl->next) 141 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 142 break; 143 if (fdl == NULL) 144 return (TRUE); 145 return (check_bound(fdl, uaddr)); 146 } 147 148 /* 149 * Returns NULL if there was some system error. 150 * Returns "" if the address was not bound, i.e the server crashed. 151 * Returns the merged address otherwise. 152 */ 153 char * 154 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 155 { 156 struct fdlist *fdl; 157 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 158 159 for (fdl = fdhead; fdl; fdl = fdl->next) 160 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 161 break; 162 if (fdl == NULL) 163 return (NULL); 164 if (check_bound(fdl, uaddr) == FALSE) 165 /* that server died */ 166 return (nullstring); 167 /* 168 * If saddr is not NULL, the remote client may have included the 169 * address by which it contacted us. Use that for the "client" uaddr, 170 * otherwise use the info from the SVCXPRT. 171 */ 172 if (saddr != NULL) { 173 c_uaddr = saddr; 174 } else { 175 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 176 if (c_uaddr == NULL) { 177 syslog(LOG_ERR, "taddr2uaddr failed for %s", 178 fdl->nconf->nc_netid); 179 return (NULL); 180 } 181 allocated_uaddr = c_uaddr; 182 } 183 184 #ifdef ND_DEBUG 185 if (debugging) { 186 if (saddr == NULL) { 187 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 188 c_uaddr); 189 } else { 190 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 191 c_uaddr); 192 } 193 } 194 #endif 195 s_uaddr = uaddr; 196 /* 197 * This is all we should need for IP 4 and 6 198 */ 199 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 200 #ifdef ND_DEBUG 201 if (debugging) 202 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 203 uaddr, m_uaddr); 204 #endif 205 if (allocated_uaddr != NULL) 206 free(allocated_uaddr); 207 return (m_uaddr); 208 } 209 210 /* 211 * Returns a netconf structure from its internal list. This 212 * structure should not be freed. 213 */ 214 struct netconfig * 215 rpcbind_get_conf(char *netid) 216 { 217 struct fdlist *fdl; 218 219 for (fdl = fdhead; fdl; fdl = fdl->next) 220 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 221 break; 222 if (fdl == NULL) 223 return (NULL); 224 return (fdl->nconf); 225 } 226