1 /* $NetBSD: check_bound.c,v 1.6 2015/11/08 16:36:28 christos 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 #ifdef RPCBIND_RUMP 61 #include <rump/rump.h> 62 #include <rump/rump_syscalls.h> 63 #endif 64 65 #include "rpcbind.h" 66 67 struct fdlist { 68 int fd; 69 struct netconfig *nconf; 70 struct fdlist *next; 71 int check_binding; 72 }; 73 74 static struct fdlist *fdhead; /* Link list of the check fd's */ 75 static struct fdlist *fdtail; 76 static const char emptystring[] = ""; 77 78 static bool_t check_bound(struct fdlist *, const char *uaddr); 79 80 /* 81 * Returns 1 if the given address is bound for the given addr & transport 82 * For all error cases, we assume that the address is bound 83 * Returns 0 for success. 84 */ 85 static bool_t 86 check_bound(struct fdlist *fdl, const char *uaddr) 87 { 88 int fd; 89 struct netbuf *na; 90 int ans; 91 92 if (fdl->check_binding == FALSE) 93 return (TRUE); 94 95 na = uaddr2taddr(fdl->nconf, uaddr); 96 if (!na) 97 return (TRUE); /* punt, should never happen */ 98 99 fd = __rpc_nconf2fd(fdl->nconf); 100 if (fd < 0) { 101 free(na); 102 return (TRUE); 103 } 104 105 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 106 107 #ifdef RPCBIND_RUMP 108 rump_sys_close(fd); 109 #else 110 close(fd); 111 #endif 112 free(na); 113 114 return (ans == 0 ? FALSE : TRUE); 115 } 116 117 int 118 add_bndlist(struct netconfig *nconf, struct netbuf *baddr) 119 { 120 struct fdlist *fdl; 121 struct netconfig *newnconf; 122 123 newnconf = getnetconfigent(nconf->nc_netid); 124 if (newnconf == NULL) 125 return (-1); 126 fdl = (struct fdlist *)malloc((u_int)sizeof (struct fdlist)); 127 if (fdl == NULL) { 128 freenetconfigent(newnconf); 129 syslog(LOG_ERR, "no memory!"); 130 return (-1); 131 } 132 fdl->nconf = newnconf; 133 fdl->next = NULL; 134 if (fdhead == NULL) { 135 fdhead = fdl; 136 fdtail = fdl; 137 } else { 138 fdtail->next = fdl; 139 fdtail = fdl; 140 } 141 /* XXX no bound checking for now */ 142 fdl->check_binding = FALSE; 143 144 return 0; 145 } 146 147 bool_t 148 is_bound(const char *netid, const char *uaddr) 149 { 150 struct fdlist *fdl; 151 152 for (fdl = fdhead; fdl; fdl = fdl->next) 153 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 154 break; 155 if (fdl == NULL) 156 return (TRUE); 157 return (check_bound(fdl, uaddr)); 158 } 159 160 /* 161 * Returns NULL if there was some system error. 162 * Returns "" if the address was not bound, i.e the server crashed. 163 * Returns the merged address otherwise. 164 */ 165 char * 166 mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) 167 { 168 struct fdlist *fdl; 169 char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; 170 171 for (fdl = fdhead; fdl; fdl = fdl->next) 172 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 173 break; 174 if (fdl == NULL) 175 return (NULL); 176 if (check_bound(fdl, uaddr) == FALSE) 177 /* that server died */ 178 return strdup(emptystring); 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 if (saddr != NULL) { 185 c_uaddr = saddr; 186 } else { 187 c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); 188 if (c_uaddr == NULL) { 189 syslog(LOG_ERR, "taddr2uaddr failed for %s", 190 fdl->nconf->nc_netid); 191 return (NULL); 192 } 193 allocated_uaddr = c_uaddr; 194 } 195 196 #ifdef RPCBIND_DEBUG 197 if (debugging) { 198 if (saddr == NULL) { 199 fprintf(stderr, "mergeaddr: client uaddr = %s\n", 200 c_uaddr); 201 } else { 202 fprintf(stderr, "mergeaddr: contact uaddr = %s\n", 203 c_uaddr); 204 } 205 } 206 #endif 207 s_uaddr = uaddr; 208 /* 209 * This is all we should need for IP 4 and 6 210 */ 211 m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); 212 #ifdef RPCBIND_DEBUG 213 if (debugging) 214 fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", 215 uaddr, m_uaddr); 216 #endif 217 if (allocated_uaddr != NULL) 218 free(allocated_uaddr); 219 return (m_uaddr); 220 } 221 222 /* 223 * Returns a netconf structure from its internal list. This 224 * structure should not be freed. 225 */ 226 struct netconfig * 227 rpcbind_get_conf(const char *netid) 228 { 229 struct fdlist *fdl; 230 231 for (fdl = fdhead; fdl; fdl = fdl->next) 232 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 233 break; 234 if (fdl == NULL) 235 return (NULL); 236 return (fdl->nconf); 237 } 238