2 * Copyright (C) 1996, 1999 Olaf Kirch
3 * Modified by Jeffrey A. Uphoff, 1997-1999.
4 * Modified by H.J. Lu, 1998.
5 * Modified by Lon Hohberger, Oct. 2000
6 * - Bugfix handling client responses.
7 * - Paranoia on NOTIFY_CALLBACK case
13 * After reboot, notify all hosts on our notify list. In order not to
14 * hang statd with delivery to dead hosts, we perform all RPC calls in
17 * It would have been nice to use the portmapper's rmtcall feature,
18 * but that's not possible for security reasons (the portmapper would
19 * have to forward the call with root privs for most statd's, which
20 * it won't if it's worth its money).
25 #include <sys/types.h>
26 #include <sys/socket.h>
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
31 #include <rpc/pmap_prot.h>
32 #include <rpc/pmap_rmt.h>
41 #include "ha-callout.h"
43 #define MAXMSGSIZE (2048 / sizeof(unsigned int))
45 static unsigned long xid = 0; /* RPC XID counter */
46 static int sockfd = -1; /* notify socket */
49 * Initialize callback socket
52 statd_get_socket(int port)
54 struct sockaddr_in sin;
59 if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
60 note(N_CRIT, "Can't create socket: %m");
64 FD_SET(sockfd, &SVC_FDSET);
66 memset(&sin, 0, sizeof(sin));
67 sin.sin_family = AF_INET;
69 if (bindresvport(sockfd, &sin) < 0) {
71 "process_hosts: can't bind to reserved port\n");
78 * Try to resolve host name for notify/callback request
80 * When compiled with RESTRICTED_STATD defined, we expect all
81 * host names to be dotted quads. See monitor.c for details. --okir
83 #ifdef RESTRICTED_STATD
85 try_to_resolve(notify_list *lp)
89 if (NL_TYPE(lp) == NOTIFY_REBOOT)
90 hname = NL_MON_NAME(lp);
92 hname = NL_MY_NAME(lp);
93 if (!inet_aton(hname, &(NL_ADDR(lp)))) {
94 note(N_ERROR, "%s is not an dotted-quad address", hname);
99 /* XXX: In order to handle multi-homed hosts, we could do
100 * a reverse lookup, a forward lookup, and cycle through
107 try_to_resolve(notify_list *lp)
112 if (NL_TYPE(lp) == NOTIFY_REBOOT)
113 hname = NL_MON_NAME(lp);
115 hname = NL_MY_NAME(lp);
117 dprintf(N_DEBUG, "Trying to resolve %s.", hname);
118 if (!(hp = gethostbyname(hname))) {
119 herror("gethostbyname");
124 if (hp->h_addrtype != AF_INET) {
125 note(N_ERROR, "%s is not an AF_INET address", hname);
130 /* FIXME: should try all addresses for multi-homed hosts in
131 * alternation because one interface might be down/unreachable. */
132 NL_ADDR(lp) = *(struct in_addr *) hp->h_addr;
134 dprintf(N_DEBUG, "address of %s is %s", hname, inet_ntoa(NL_ADDR(lp)));
140 xmit_call(int sockfd, struct sockaddr_in *sin,
141 u_int32_t prog, u_int32_t vers, u_int32_t proc,
142 xdrproc_t func, void *obj)
143 /* __u32 prog, __u32 vers, __u32 proc, xdrproc_t func, void *obj) */
145 unsigned int msgbuf[MAXMSGSIZE], msglen;
148 XDR xdr, *xdrs = &xdr;
152 xid = getpid() + time(NULL);
155 mesg.rm_direction = CALL;
156 mesg.rm_call.cb_rpcvers = 2;
157 if (sin->sin_port == 0) {
158 sin->sin_port = htons(PMAPPORT);
159 mesg.rm_call.cb_prog = PMAPPROG;
160 mesg.rm_call.cb_vers = PMAPVERS;
161 mesg.rm_call.cb_proc = PMAPPROC_GETPORT;
164 pmap.pm_prot = IPPROTO_UDP;
166 func = (xdrproc_t) xdr_pmap;
169 mesg.rm_call.cb_prog = prog;
170 mesg.rm_call.cb_vers = vers;
171 mesg.rm_call.cb_proc = proc;
173 mesg.rm_call.cb_cred.oa_flavor = AUTH_NULL;
174 mesg.rm_call.cb_cred.oa_base = (caddr_t) NULL;
175 mesg.rm_call.cb_cred.oa_length = 0;
176 mesg.rm_call.cb_verf.oa_flavor = AUTH_NULL;
177 mesg.rm_call.cb_verf.oa_base = (caddr_t) NULL;
178 mesg.rm_call.cb_verf.oa_length = 0;
180 /* Create XDR memory object for encoding */
181 xdrmem_create(xdrs, (caddr_t) msgbuf, sizeof(msgbuf), XDR_ENCODE);
183 /* Encode the RPC header part and payload */
184 if (!xdr_callmsg(xdrs, &mesg) || !func(xdrs, obj)) {
185 dprintf(N_WARNING, "xmit_mesg: can't encode RPC message!\n");
190 /* Get overall length of datagram */
191 msglen = xdr_getpos(xdrs);
193 if ((err = sendto(sockfd, msgbuf, msglen, 0,
194 (struct sockaddr *) sin, sizeof(*sin))) < 0) {
195 dprintf(N_WARNING, "xmit_mesg: sendto failed: %m");
196 } else if (err != msglen) {
197 dprintf(N_WARNING, "xmit_mesg: short write: %m\n");
202 return err == msglen? xid : 0;
206 recv_rply(int sockfd, struct sockaddr_in *sin, u_long *portp)
208 unsigned int msgbuf[MAXMSGSIZE], msglen;
210 notify_list *lp = NULL;
211 XDR xdr, *xdrs = &xdr;
212 int alen = sizeof(*sin);
214 /* Receive message */
215 if ((msglen = recvfrom(sockfd, msgbuf, sizeof(msgbuf), 0,
216 (struct sockaddr *) sin, &alen)) < 0) {
217 dprintf(N_WARNING, "recv_rply: recvfrom failed: %m");
221 /* Create XDR object for decoding buffer */
222 xdrmem_create(xdrs, (caddr_t) msgbuf, msglen, XDR_DECODE);
224 memset(&mesg, 0, sizeof(mesg));
225 mesg.rm_reply.rp_acpt.ar_results.where = NULL;
226 mesg.rm_reply.rp_acpt.ar_results.proc = (xdrproc_t) xdr_void;
228 if (!xdr_replymsg(xdrs, &mesg)) {
229 note(N_WARNING, "recv_rply: can't decode RPC message!\n");
233 if (mesg.rm_reply.rp_stat != 0) {
234 note(N_WARNING, "recv_rply: [%s] RPC status %d\n",
235 inet_ntoa(sin->sin_addr),
236 mesg.rm_reply.rp_stat);
239 if (mesg.rm_reply.rp_acpt.ar_stat != 0) {
240 note(N_WARNING, "recv_rply: [%s] RPC status %d\n",
241 inet_ntoa(sin->sin_addr),
242 mesg.rm_reply.rp_acpt.ar_stat);
246 for (lp = notify; lp != NULL; lp = lp->next) {
247 /* LH - this was a bug... it should have been checking
248 * the xid from the response message from the client,
249 * not the static, internal xid */
250 if (lp->xid != mesg.rm_xid)
252 if (lp->addr.s_addr != sin->sin_addr.s_addr) {
254 strncpy (addr, inet_ntoa(lp->addr),
256 addr [sizeof (addr) - 1] = '\0';
257 dprintf(N_WARNING, "address mismatch: "
258 "expected %s, got %s\n",
259 addr, inet_ntoa(sin->sin_addr));
262 if (!xdr_u_long(xdrs, portp)) {
263 note(N_WARNING, "recv_rply: [%s] "
264 "can't decode reply body!\n",
265 inet_ntoa(sin->sin_addr));
279 * Notify operation for a single list entry
282 process_entry(int sockfd, notify_list *lp)
284 struct sockaddr_in sin;
285 struct status new_status;
288 u_int32_t proc, vers, prog;
289 /* __u32 proc, vers, prog; */
291 if (lp->addr.s_addr == INADDR_ANY && !try_to_resolve(lp))
293 if (NL_TIMES(lp) == 0) {
294 note(N_DEBUG, "Cannot notify %s, giving up.\n",
295 inet_ntoa(NL_ADDR(lp)));
299 memset(&sin, 0, sizeof(sin));
300 sin.sin_family = AF_INET;
301 sin.sin_port = lp->port;
302 /* LH - moved address into switch */
304 switch (NL_TYPE(lp)) {
310 /* Use source address for notify replies */
311 sin.sin_addr = lp->addr;
313 func = (xdrproc_t) xdr_stat_chge;
314 objp = &SM_stat_chge;
316 case NOTIFY_CALLBACK:
317 prog = NL_MY_PROG(lp);
318 vers = NL_MY_VERS(lp);
319 proc = NL_MY_PROC(lp);
321 /* __FORCE__ loopback for callbacks to lockd ... */
322 /* Just in case we somehow ignored it thus far */
323 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
325 func = (xdrproc_t) xdr_status;
327 new_status.mon_name = NL_MON_NAME(lp);
328 new_status.state = NL_STATE(lp);
329 memcpy(new_status.priv, NL_PRIV(lp), SM_PRIV_SIZE);
332 note(N_ERROR, "notify_host: unknown notify type %d",
337 lp->xid = xmit_call(sockfd, &sin, prog, vers, proc, func, objp);
339 note(N_WARNING, "notify_host: failed to notify %s\n",
340 inet_ntoa(lp->addr));
348 * Process a datagram received on the notify socket
351 process_reply(FD_SET_TYPE *rfds)
353 struct sockaddr_in sin;
357 if (sockfd == -1 || !FD_ISSET(sockfd, rfds))
360 if (!(lp = recv_rply(sockfd, &sin, &port)))
365 lp->port = htons((unsigned short) port);
366 process_entry(sockfd, lp);
367 NL_WHEN(lp) = time(NULL) + NOTIFY_TIMEOUT;
368 nlist_remove(¬ify, lp);
369 nlist_insert_timer(¬ify, lp);
372 note(N_WARNING, "recv_rply: [%s] service %d not registered",
374 NL_TYPE(lp) == NOTIFY_REBOOT? SM_PROG : NL_MY_PROG(lp));
375 } else if (NL_TYPE(lp) == NOTIFY_REBOOT) {
376 dprintf(N_DEBUG, "Notification of %s succeeded.",
378 xunlink(SM_BAK_DIR, NL_MON_NAME(lp), 0);
380 dprintf(N_DEBUG, "Callback to %s (for %d) succeeded.",
381 NL_MY_NAME(lp), NL_MON_NAME(lp));
383 nlist_free(¬ify, lp);
388 * Process a notify list, either for notifying remote hosts after reboot
389 * or for calling back (local) statd clients when the remote has notified
393 process_notify_list(void)
399 if ((fd = statd_get_socket(0)) < 0)
402 while ((entry = notify) != NULL && NL_WHEN(entry) < time(&now)) {
403 if (process_entry(fd, entry)) {
404 NL_WHEN(entry) = time(NULL) + NOTIFY_TIMEOUT;
405 nlist_remove(¬ify, entry);
406 nlist_insert_timer(¬ify, entry);
407 } else if (NL_TYPE(entry) == NOTIFY_CALLBACK) {
409 "Can't callback %s (%d,%d), giving up.",
413 nlist_free(¬ify, entry);
416 "Can't notify %s, giving up.",
418 /* PRC: do the HA callout */
419 ha_callout("del-client", NL_MON_NAME(entry), NL_MY_NAME(entry), -1);
420 xunlink(SM_BAK_DIR, NL_MON_NAME(entry), 0);
421 nlist_free(¬ify, entry);