--- /dev/null
+/*
+ * Copyright (c) 1995
+ * A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed for the FreeBSD project
+ * 4. Neither the name of the author nor the names of any co-contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ANDREW GORDON 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 AUTHOR 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.
+ *
+ */
+
+#ifndef lint
+static const char rcsid[] =
+ "$FreeBSD$";
+#endif /* not lint */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <rpc/rpc.h>
+#include <syslog.h>
+#include <vis.h>
+#include <netdb.h> /* for getaddrinfo() */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "statd.h"
+
+/* sm_check_hostname -------------------------------------------------------- */
+/*
+ * Purpose: Check `mon_name' member of sm_name struct to ensure that the array
+ * consists only of printable characters.
+ *
+ * Returns: TRUE if hostname is good. FALSE if hostname contains binary or
+ * otherwise non-printable characters.
+ *
+ * Notes: Will syslog(3) to warn of corrupt hostname.
+ */
+
+int sm_check_hostname(struct svc_req *req, char *arg)
+{
+ int len, dstlen, ret;
+ struct sockaddr_in *claddr;
+ char *dst;
+
+ len = strlen(arg);
+ dstlen = (4 * len) + 1;
+ dst = malloc(dstlen);
+ claddr = svc_getcaller(req->rq_xprt);
+ ret = 1;
+
+ if (claddr == NULL || dst == NULL)
+ {
+ ret = 0;
+ }
+ else if (strvis(dst, arg, VIS_WHITE) != len)
+ {
+ syslog(LOG_ERR,
+ "sm_stat: client %s hostname %s contained invalid characters.",
+ inet_ntoa(claddr->sin_addr),
+ dst);
+ ret = 0;
+ }
+ free(dst);
+ return (ret);
+}
+
+/* sm_stat_1 --------------------------------------------------------------- */
+/*
+ Purpose: RPC call to enquire if a host can be monitored
+ Returns: TRUE for any hostname that can be looked up to give
+ an address.
+*/
+
+struct sm_stat_res *sm_stat_1_svc(sm_name *arg, struct svc_req *req)
+{
+ static sm_stat_res res;
+ struct addrinfo *ai;
+ struct sockaddr_in *claddr;
+ static int err;
+
+ err = 1;
+ if ((err = sm_check_hostname(req, arg->mon_name)) == 0)
+ {
+ res.res_stat = stat_fail;
+ }
+ if (err != 0)
+ {
+ if (debug)
+ syslog(LOG_DEBUG, "stat called for host %s", arg->mon_name);
+ if (getaddrinfo(arg->mon_name, NULL, NULL, &ai) == 0) {
+ res.res_stat = stat_succ;
+ freeaddrinfo(ai);
+ }
+ else
+ {
+ claddr = svc_getcaller(req->rq_xprt);
+ syslog(LOG_ERR, "invalid hostname to sm_stat from %s: %s",
+ inet_ntoa(claddr->sin_addr), arg->mon_name);
+ res.res_stat = stat_fail;
+ }
+ }
+ res.state = status_info->ourState;
+ return (&res);
+}
+
+/* sm_mon_1 ---------------------------------------------------------------- */
+/*
+ Purpose: RPC procedure to establish a monitor request
+ Returns: Success, unless lack of resources prevents
+ the necessary structures from being set up
+ to record the request, or if the hostname is not
+ valid (as judged by getaddrinfo())
+*/
+
+struct sm_stat_res *sm_mon_1_svc(mon *arg, struct svc_req *req)
+{
+ static sm_stat_res res;
+ HostInfo *hp;
+ static int err;
+ MonList *lp;
+ struct addrinfo *ai;
+
+ if ((err = sm_check_hostname(req, arg->mon_id.mon_name)) == 0)
+ {
+ res.res_stat = stat_fail;
+ }
+
+ if (err != 0)
+ {
+ if (debug)
+ {
+ syslog(LOG_DEBUG, "monitor request for host %s", arg->mon_id.mon_name);
+ syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
+ arg->mon_id.mon_name,
+ arg->mon_id.my_id.my_prog, arg->mon_id.my_id.my_vers,
+ arg->mon_id.my_id.my_proc);
+ }
+ res.res_stat = stat_fail; /* Assume fail until set otherwise */
+ res.state = status_info->ourState;
+
+ /* Find existing host entry, or create one if not found */
+ /* If find_host() fails, it will have logged the error already. */
+ if (getaddrinfo(arg->mon_id.mon_name, NULL, NULL, &ai) != 0)
+ {
+ syslog(LOG_ERR, "Invalid hostname to sm_mon: %s", arg->mon_id.mon_name);
+ return (&res);
+ }
+ freeaddrinfo(ai);
+ if ((hp = find_host(arg->mon_id.mon_name, TRUE)))
+ {
+ lp = (MonList *)malloc(sizeof(MonList));
+ if (!lp)
+ {
+ syslog(LOG_ERR, "Out of memory");
+ }
+ else
+ {
+ strncpy(lp->notifyHost, arg->mon_id.my_id.my_name, SM_MAXSTRLEN);
+ lp->notifyProg = arg->mon_id.my_id.my_prog;
+ lp->notifyVers = arg->mon_id.my_id.my_vers;
+ lp->notifyProc = arg->mon_id.my_id.my_proc;
+ memcpy(lp->notifyData, arg->priv, sizeof(lp->notifyData));
+
+ lp->next = hp->monList;
+ hp->monList = lp;
+ sync_file();
+
+ res.res_stat = stat_succ; /* Report success */
+ }
+ }
+ }
+ return (&res);
+}
+
+/* do_unmon ---------------------------------------------------------------- */
+/*
+ Purpose: Remove a monitor request from a host
+ Returns: TRUE if found, FALSE if not found.
+ Notes: Common code from sm_unmon_1_svc and sm_unmon_all_1_svc
+ In the unlikely event of more than one identical monitor
+ request, all are removed.
+*/
+
+static int do_unmon(HostInfo *hp, my_id *idp)
+{
+ MonList *lp, *next;
+ MonList *last = NULL;
+ int result = FALSE;
+
+ lp = hp->monList;
+ while (lp)
+ {
+ if (!strncasecmp(idp->my_name, lp->notifyHost, SM_MAXSTRLEN)
+ && (idp->my_prog == lp->notifyProg) && (idp->my_proc == lp->notifyProc)
+ && (idp->my_vers == lp->notifyVers))
+ {
+ /* found one. Unhook from chain and free. */
+ next = lp->next;
+ if (last) last->next = next;
+ else hp->monList = next;
+ free(lp);
+ lp = next;
+ result = TRUE;
+ }
+ else
+ {
+ last = lp;
+ lp = lp->next;
+ }
+ }
+ return (result);
+}
+
+/* sm_unmon_1 -------------------------------------------------------------- */
+/*
+ Purpose: RPC procedure to release a monitor request.
+ Returns: Local machine's status number
+ Notes: The supplied mon_id should match the value passed in an
+ earlier call to sm_mon_1
+*/
+
+struct sm_stat *sm_unmon_1_svc(mon_id *arg, struct svc_req *req __unused)
+{
+ static sm_stat res;
+ HostInfo *hp;
+
+ if (debug)
+ {
+ syslog(LOG_DEBUG, "un-monitor request for host %s", arg->mon_name);
+ syslog(LOG_DEBUG, "recall host: %s prog: %d ver: %d proc: %d",
+ arg->mon_name,
+ arg->my_id.my_prog, arg->my_id.my_vers, arg->my_id.my_proc);
+ }
+
+ if ((hp = find_host(arg->mon_name, FALSE)))
+ {
+ if (do_unmon(hp, &arg->my_id)) sync_file();
+ else
+ {
+ syslog(LOG_ERR, "unmon request from %s, no matching monitor",
+ arg->my_id.my_name);
+ }
+ }
+ else syslog(LOG_ERR, "unmon request from %s for unknown host %s",
+ arg->my_id.my_name, arg->mon_name);
+
+ res.state = status_info->ourState;
+
+ return (&res);
+}
+
+/* sm_unmon_all_1 ---------------------------------------------------------- */
+/*
+ Purpose: RPC procedure to release monitor requests.
+ Returns: Local machine's status number
+ Notes: Releases all monitor requests (if any) from the specified
+ host and program number.
+*/
+
+struct sm_stat *sm_unmon_all_1_svc(my_id *arg, struct svc_req *req __unused)
+{
+ static sm_stat res;
+ HostInfo *hp;
+ int i;
+
+ if (debug)
+ {
+ syslog(LOG_DEBUG, "unmon_all for host: %s prog: %d ver: %d proc: %d",
+ arg->my_name, arg->my_prog, arg->my_vers, arg->my_proc);
+ }
+
+ for (i = status_info->noOfHosts, hp = status_info->hosts; i; i--, hp++)
+ {
+ do_unmon(hp, arg);
+ }
+ sync_file();
+
+ res.state = status_info->ourState;
+
+ return (&res);
+}
+
+/* sm_simu_crash_1 --------------------------------------------------------- */
+/*
+ Purpose: RPC procedure to simulate a crash
+ Returns: Nothing
+ Notes: Standardised mechanism for debug purposes
+ The specification says that we should drop all of our
+ status information (apart from the list of monitored hosts
+ on disc). However, this would confuse the rpc.lockd
+ which would be unaware that all of its monitor requests
+ had been silently junked. Hence we in fact retain all
+ current requests and simply increment the status counter
+ and inform all hosts on the monitor list.
+*/
+
+void *sm_simu_crash_1_svc(void *v __unused, struct svc_req *req __unused)
+{
+ static char dummy;
+ int work_to_do = FALSE;
+ HostInfo *hp;
+ int i;
+
+ if (debug) syslog(LOG_DEBUG, "simu_crash called!!");
+
+ /* Simulate crash by setting notify-required flag on all monitored */
+ /* hosts, and incrementing our status number. notify_hosts() is */
+ /* then called to fork a process to do the notifications. */
+
+ for (i = status_info->noOfHosts, hp = status_info->hosts; i ; i--, hp++)
+ {
+ if (hp->monList)
+ {
+ work_to_do = TRUE;
+ hp->notifyReqd = TRUE;
+ }
+ }
+ status_info->ourState += 2; /* always even numbers if not crashed */
+
+ if (work_to_do) notify_hosts();
+
+ return (&dummy);
+}
+
+/* sm_notify_1 ------------------------------------------------------------- */
+/*
+ Purpose: RPC procedure notifying local statd of the crash of another
+ Returns: Nothing
+ Notes: There is danger of deadlock, since it is quite likely that
+ the client procedure that we call will in turn call us
+ to remove or adjust the monitor request.
+ We therefore fork() a process to do the notifications.
+ Note that the main HostInfo structure is in a mmap()
+ region and so will be shared with the child, but the
+ monList pointed to by the HostInfo is in normal memory.
+ Hence if we read the monList before forking, we are
+ protected from the parent servicing other requests
+ that modify the list.
+*/
+
+void *sm_notify_1_svc(stat_chge *arg, struct svc_req *req __unused)
+{
+ struct timeval timeout = { 20, 0 }; /* 20 secs timeout */
+ CLIENT *cli;
+ static char dummy;
+ sm_status tx_arg; /* arg sent to callback procedure */
+ MonList *lp;
+ HostInfo *hp;
+ pid_t pid;
+
+ if (debug) syslog(LOG_DEBUG, "notify from host %s, new state %d",
+ arg->mon_name, arg->state);
+
+ hp = find_host(arg->mon_name, FALSE);
+ if (!hp)
+ {
+ /* Never heard of this host - why is it notifying us? */
+ syslog(LOG_ERR, "Unsolicited notification from host %s", arg->mon_name);
+ return (&dummy);
+ }
+ lp = hp->monList;
+ if (!lp) return (&dummy); /* We know this host, but have no */
+ /* outstanding requests. */
+ pid = fork();
+ if (pid == -1)
+ {
+ syslog(LOG_ERR, "Unable to fork notify process - %s", strerror(errno));
+ return (NULL); /* no answer, the client will retry */
+ }
+ if (pid) return (&dummy); /* Parent returns */
+
+ while (lp)
+ {
+ tx_arg.mon_name = arg->mon_name;
+ tx_arg.state = arg->state;
+ memcpy(tx_arg.priv, lp->notifyData, sizeof(tx_arg.priv));
+ cli = clnt_create(lp->notifyHost, lp->notifyProg, lp->notifyVers, "udp");
+ if (!cli)
+ {
+ syslog(LOG_ERR, "Failed to contact host %s%s", lp->notifyHost,
+ clnt_spcreateerror(""));
+ }
+ else
+ {
+ if (clnt_call(cli, lp->notifyProc, xdr_sm_status, &tx_arg, xdr_void,
+ &dummy, timeout) != RPC_SUCCESS)
+ {
+ syslog(LOG_ERR, "Failed to call rpc.statd client at host %s",
+ lp->notifyHost);
+ }
+ clnt_destroy(cli);
+ }
+ lp = lp->next;
+ }
+
+ exit (0); /* Child quits */
+}
projects / apple / network_cmds.git / blobdiff