1 /* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 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 univeral 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 __P((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); 97 return (TRUE); 98 } 99 100 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 101 102 close(fd); 103 free(na); 104 105 return (ans == 0 ? FALSE : TRUE); 106 } 107 108 int 109 add_bndlist(struct netconfig *nconf, struct netbuf *baddr) 110 { 111 struct fdlist *fdl; 112 struct netconfig *newnconf; 113 114 newnconf = getnetconfigent(nconf->nc_netid); 115 if (newnconf == NULL) 116 return (-1); 117 fdl = (struct fdlist *)malloc((u_int)sizeof (struct fdlist)); 118 if (fdl == NULL) { 119 freenetconfigent(newnconf); 120 syslog(LOG_ERR, "no memory!"); 121 return (-1); 122 } 123 fdl->nconf = newnconf; 124 fdl->next = NULL; 125 if (fdhead == NULL) { 126 fdhead = fdl; 127 fdtail = fdl; 128 } else { 129 fdtail->next = fdl; 130 fdtail = fdl; 131 } 132 /* XXX no bound checking for now */ 133 fdl->check_binding = FALSE; 134 135 return 0; 136 } 137 138 bool_t 139 is_bound(char *netid, char *uaddr) 140 { 141 struct fdlist *fdl; 142 143 for (fdl = fdhead; fdl; fdl = fdl->next) 144 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 145 break; 146 if (fdl == NULL) 147 return (TRUE); 148 return (check_bound(fdl, uaddr)); 149 } 150 151 /* 152 * Returns NULL if there was some system error. 153 * Returns "" if the address was not bound, i.e the server crashed. 154 * Returns the merged address otherwise. 155 */ 156 char * 157 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 158 { 159 struct fdlist *fdl; 160 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 161 162 for (fdl = fdhead; fdl; fdl = fdl->next) 163 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 164 break; 165 if (fdl == NULL) 166 return (NULL); 167 if (check_bound(fdl, uaddr) == FALSE) 168 /* that server died */ 169 return (nullstring); 170 /* 171 * If saddr is not NULL, the remote client may have included the 172 * address by which it contacted us. Use that for the "client" uaddr, 173 * otherwise use the info from the SVCXPRT. 174 */ 175 if (saddr != NULL) { 176 c_uaddr = saddr; 177 } else { 178 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 179 if (c_uaddr == NULL) { 180 syslog(LOG_ERR, "taddr2uaddr failed for %s", 181 fdl->nconf->nc_netid); 182 return (NULL); 183 } 184 allocated_uaddr = c_uaddr; 185 } 186 187 #ifdef ND_DEBUG 188 if (debugging) { 189 if (saddr == NULL) { 190 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 191 c_uaddr); 192 } else { 193 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 194 c_uaddr); 195 } 196 } 197 #endif 198 s_uaddr = uaddr; 199 /* 200 * This is all we should need for IP 4 and 6 201 */ 202 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 203 #ifdef ND_DEBUG 204 if (debugging) 205 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 206 uaddr, m_uaddr); 207 #endif 208 if (allocated_uaddr != NULL) 209 free(allocated_uaddr); 210 return (m_uaddr); 211 } 212 213 /* 214 * Returns a netconf structure from its internal list. This 215 * structure should not be freed. 216 */ 217 struct netconfig * 218 rpcbind_get_conf(char *netid) 219 { 220 struct fdlist *fdl; 221 222 for (fdl = fdhead; fdl; fdl = fdl->next) 223 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 224 break; 225 if (fdl == NULL) 226 return (NULL); 227 return (fdl->nconf); 228 } 229