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Diffstat (limited to 'usr.sbin/rpcbind/check_bound.c')
| -rw-r--r-- | usr.sbin/rpcbind/check_bound.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/usr.sbin/rpcbind/check_bound.c b/usr.sbin/rpcbind/check_bound.c new file mode 100644 index 000000000000..820f76d37346 --- /dev/null +++ b/usr.sbin/rpcbind/check_bound.c @@ -0,0 +1,235 @@ +/* $NetBSD: check_bound.c,v 1.2 2000/06/22 08:09:26 fvdl Exp $ */ + +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2009, Sun Microsystems, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * - Neither the name of Sun Microsystems, Inc. nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +/* + * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. + */ + +/* + * check_bound.c + * Checks to see whether the program is still bound to the + * claimed address and returns the universal merged address + * + */ + +#include <sys/types.h> +#include <sys/socket.h> + +#include <rpc/rpc.h> +#include <rpc/svc_dg.h> + +#include <netconfig.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#include "rpcbind.h" + +struct fdlist { + int fd; + struct netconfig *nconf; + struct fdlist *next; + int check_binding; +}; + +static struct fdlist *fdhead; /* Link list of the check fd's */ +static struct fdlist *fdtail; +static char nullstring[] = ""; + +static bool_t check_bound(struct fdlist *, const char *uaddr); + +/* + * Returns 1 if the given address is bound for the given addr & transport + * For all error cases, we assume that the address is bound + * Returns 0 for success. + */ +static bool_t +check_bound(struct fdlist *fdl, const char *uaddr) +{ + int fd; + struct netbuf *na; + int ans; + + if (fdl->check_binding == FALSE) + return (TRUE); + + na = uaddr2taddr(fdl->nconf, uaddr); + if (!na) + return (TRUE); /* punt, should never happen */ + + fd = __rpc_nconf2fd(fdl->nconf); + if (fd < 0) { + free(na->buf); + free(na); + return (TRUE); + } + + ans = bind(fd, (struct sockaddr *)na->buf, na->len); + + close(fd); + free(na->buf); + free(na); + + return (ans == 0 ? FALSE : TRUE); +} + +int +add_bndlist(const struct netconfig *nconf, struct netbuf *baddr __unused) +{ + struct fdlist *fdl; + struct netconfig *newnconf; + + newnconf = getnetconfigent(nconf->nc_netid); + if (newnconf == NULL) + return (-1); + fdl = malloc(sizeof(*fdl)); + if (fdl == NULL) { + freenetconfigent(newnconf); + syslog(LOG_ERR, "no memory!"); + return (-1); + } + fdl->nconf = newnconf; + fdl->next = NULL; + if (fdhead == NULL) { + fdhead = fdl; + fdtail = fdl; + } else { + fdtail->next = fdl; + fdtail = fdl; + } + /* XXX no bound checking for now */ + fdl->check_binding = FALSE; + + return 0; +} + +bool_t +is_bound(const char *netid, const char *uaddr) +{ + struct fdlist *fdl; + + for (fdl = fdhead; fdl; fdl = fdl->next) + if (strcmp(fdl->nconf->nc_netid, netid) == 0) + break; + if (fdl == NULL) + return (TRUE); + return (check_bound(fdl, uaddr)); +} + +/* + * Returns NULL if there was some system error. + * Returns "" if the address was not bound, i.e the server crashed. + * Returns the merged address otherwise. + */ +char * +mergeaddr(SVCXPRT *xprt, char *netid, char *uaddr, char *saddr) +{ + struct fdlist *fdl; + struct netbuf *callee; + char *c_uaddr, *s_uaddr, *m_uaddr, *allocated_uaddr = NULL; + + for (fdl = fdhead; fdl; fdl = fdl->next) + if (strcmp(fdl->nconf->nc_netid, netid) == 0) + break; + if (fdl == NULL) + return (NULL); + if (check_bound(fdl, uaddr) == FALSE) + /* that server died */ + return (nullstring); + /* + * Try to determine the local address on which the client contacted us, + * so we can send a reply from the same address. If it's unknown, then + * try to determine which address the client used, and pick a nearby + * local address. + * + * If saddr is not NULL, the remote client may have included the + * address by which it contacted us. Use that for the "client" uaddr, + * otherwise use the info from the SVCXPRT. + */ + callee = svc_getrpccallee(xprt); + if (callee != NULL && callee->buf != NULL) { + c_uaddr = taddr2uaddr(fdl->nconf, callee); + allocated_uaddr = c_uaddr; + } else if (saddr != NULL) { + c_uaddr = saddr; + } else { + c_uaddr = taddr2uaddr(fdl->nconf, svc_getrpccaller(xprt)); + allocated_uaddr = c_uaddr; + } + if (c_uaddr == NULL) { + syslog(LOG_ERR, "taddr2uaddr failed for %s", + fdl->nconf->nc_netid); + return (NULL); + } + +#ifdef RPCBIND_DEBUG + if (debugging) { + if (saddr == NULL) { + fprintf(stderr, "mergeaddr: client uaddr = %s\n", + c_uaddr); + } else { + fprintf(stderr, "mergeaddr: contact uaddr = %s\n", + c_uaddr); + } + } +#endif + s_uaddr = uaddr; + /* + * This is all we should need for IP 4 and 6 + */ + m_uaddr = addrmerge(svc_getrpccaller(xprt), s_uaddr, c_uaddr, netid); +#ifdef RPCBIND_DEBUG + if (debugging) + fprintf(stderr, "mergeaddr: uaddr = %s, merged uaddr = %s\n", + uaddr, m_uaddr); +#endif + free(allocated_uaddr); + return (m_uaddr); +} + +/* + * Returns a netconf structure from its internal list. This + * structure should not be freed. + */ +struct netconfig * +rpcbind_get_conf(const char *netid) +{ + struct fdlist *fdl; + + for (fdl = fdhead; fdl; fdl = fdl->next) + if (strcmp(fdl->nconf->nc_netid, netid) == 0) + break; + if (fdl == NULL) + return (NULL); + return (fdl->nconf); +} |