check_bound.c revision 1.1
1 /* $NetBSD: check_bound.c,v 1.1 2000/06/02 23:15:41 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 return (TRUE); 97 98 ans = bind(fd, (struct sockaddr *)na->buf, na->len); 99 100 close(fd); 101 102 return (ans == 0 ? FALSE : TRUE); 103 } 104 105 int 106 add_bndlist(struct netconfig *nconf, struct netbuf *baddr) 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 = (struct fdlist *)malloc((u_int)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; 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 } 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 return (m_uaddr); 205 } 206 207 /* 208 * Returns a netconf structure from its internal list. This 209 * structure should not be freed. 210 */ 211 struct netconfig * 212 rpcbind_get_conf(char *netid) 213 { 214 struct fdlist *fdl; 215 216 for (fdl = fdhead; fdl; fdl = fdl->next) 217 if (strcmp(fdl->nconf->nc_netid, netid) == 0) 218 break; 219 if (fdl == NULL) 220 return (NULL); 221 return (fdl->nconf); 222 } 223
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