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;
70 * If a local hostname is given (-n option to statd), bind to the address
71 * specified. This is required to support clients that ignore the mon_name in
72 * the statd protocol but use the source address from the request packet.
75 struct hostent *hp = gethostbyname(MY_NAME);
77 sin.sin_addr = *(struct in_addr *) hp->h_addr;
79 if (bindresvport(sockfd, &sin) < 0) {
81 "process_hosts: can't bind to reserved port\n");
88 * Try to resolve host name for notify/callback request
90 * When compiled with RESTRICTED_STATD defined, we expect all
91 * host names to be dotted quads. See monitor.c for details. --okir
93 #ifdef RESTRICTED_STATD
95 try_to_resolve(notify_list *lp)
99 if (NL_TYPE(lp) == NOTIFY_REBOOT)
100 hname = NL_MON_NAME(lp);
102 hname = NL_MY_NAME(lp);
103 if (!inet_aton(hname, &(NL_ADDR(lp)))) {
104 note(N_ERROR, "%s is not an dotted-quad address", hname);
109 /* XXX: In order to handle multi-homed hosts, we could do
110 * a reverse lookup, a forward lookup, and cycle through
117 try_to_resolve(notify_list *lp)
122 if (NL_TYPE(lp) == NOTIFY_REBOOT)
123 hname = NL_MON_NAME(lp);
125 hname = NL_MY_NAME(lp);
127 dprintf(N_DEBUG, "Trying to resolve %s.", hname);
128 if (!(hp = gethostbyname(hname))) {
129 herror("gethostbyname");
134 if (hp->h_addrtype != AF_INET) {
135 note(N_ERROR, "%s is not an AF_INET address", hname);
140 /* FIXME: should try all addresses for multi-homed hosts in
141 * alternation because one interface might be down/unreachable. */
142 NL_ADDR(lp) = *(struct in_addr *) hp->h_addr;
144 dprintf(N_DEBUG, "address of %s is %s", hname, inet_ntoa(NL_ADDR(lp)));
150 xmit_call(int sockfd, struct sockaddr_in *sin,
151 u_int32_t prog, u_int32_t vers, u_int32_t proc,
152 xdrproc_t func, void *obj)
153 /* __u32 prog, __u32 vers, __u32 proc, xdrproc_t func, void *obj) */
155 unsigned int msgbuf[MAXMSGSIZE], msglen;
158 XDR xdr, *xdrs = &xdr;
162 xid = getpid() + time(NULL);
165 mesg.rm_direction = CALL;
166 mesg.rm_call.cb_rpcvers = 2;
167 if (sin->sin_port == 0) {
168 sin->sin_port = htons(PMAPPORT);
169 mesg.rm_call.cb_prog = PMAPPROG;
170 mesg.rm_call.cb_vers = PMAPVERS;
171 mesg.rm_call.cb_proc = PMAPPROC_GETPORT;
174 pmap.pm_prot = IPPROTO_UDP;
176 func = (xdrproc_t) xdr_pmap;
179 mesg.rm_call.cb_prog = prog;
180 mesg.rm_call.cb_vers = vers;
181 mesg.rm_call.cb_proc = proc;
183 mesg.rm_call.cb_cred.oa_flavor = AUTH_NULL;
184 mesg.rm_call.cb_cred.oa_base = (caddr_t) NULL;
185 mesg.rm_call.cb_cred.oa_length = 0;
186 mesg.rm_call.cb_verf.oa_flavor = AUTH_NULL;
187 mesg.rm_call.cb_verf.oa_base = (caddr_t) NULL;
188 mesg.rm_call.cb_verf.oa_length = 0;
190 /* Create XDR memory object for encoding */
191 xdrmem_create(xdrs, (caddr_t) msgbuf, sizeof(msgbuf), XDR_ENCODE);
193 /* Encode the RPC header part and payload */
194 if (!xdr_callmsg(xdrs, &mesg) || !func(xdrs, obj)) {
195 dprintf(N_WARNING, "xmit_mesg: can't encode RPC message!\n");
200 /* Get overall length of datagram */
201 msglen = xdr_getpos(xdrs);
203 if ((err = sendto(sockfd, msgbuf, msglen, 0,
204 (struct sockaddr *) sin, sizeof(*sin))) < 0) {
205 dprintf(N_WARNING, "xmit_mesg: sendto failed: %m");
206 } else if (err != msglen) {
207 dprintf(N_WARNING, "xmit_mesg: short write: %m\n");
212 return err == msglen? xid : 0;
216 recv_rply(int sockfd, struct sockaddr_in *sin, u_long *portp)
218 unsigned int msgbuf[MAXMSGSIZE], msglen;
220 notify_list *lp = NULL;
221 XDR xdr, *xdrs = &xdr;
222 int alen = sizeof(*sin);
224 /* Receive message */
225 if ((msglen = recvfrom(sockfd, msgbuf, sizeof(msgbuf), 0,
226 (struct sockaddr *) sin, &alen)) < 0) {
227 dprintf(N_WARNING, "recv_rply: recvfrom failed: %m");
231 /* Create XDR object for decoding buffer */
232 xdrmem_create(xdrs, (caddr_t) msgbuf, msglen, XDR_DECODE);
234 memset(&mesg, 0, sizeof(mesg));
235 mesg.rm_reply.rp_acpt.ar_results.where = NULL;
236 mesg.rm_reply.rp_acpt.ar_results.proc = (xdrproc_t) xdr_void;
238 if (!xdr_replymsg(xdrs, &mesg)) {
239 note(N_WARNING, "recv_rply: can't decode RPC message!\n");
243 if (mesg.rm_reply.rp_stat != 0) {
244 note(N_WARNING, "recv_rply: [%s] RPC status %d\n",
245 inet_ntoa(sin->sin_addr),
246 mesg.rm_reply.rp_stat);
249 if (mesg.rm_reply.rp_acpt.ar_stat != 0) {
250 note(N_WARNING, "recv_rply: [%s] RPC status %d\n",
251 inet_ntoa(sin->sin_addr),
252 mesg.rm_reply.rp_acpt.ar_stat);
256 for (lp = notify; lp != NULL; lp = lp->next) {
257 /* LH - this was a bug... it should have been checking
258 * the xid from the response message from the client,
259 * not the static, internal xid */
260 if (lp->xid != mesg.rm_xid)
262 if (lp->addr.s_addr != sin->sin_addr.s_addr) {
264 strncpy (addr, inet_ntoa(lp->addr),
266 addr [sizeof (addr) - 1] = '\0';
267 dprintf(N_WARNING, "address mismatch: "
268 "expected %s, got %s\n",
269 addr, inet_ntoa(sin->sin_addr));
272 if (!xdr_u_long(xdrs, portp)) {
273 note(N_WARNING, "recv_rply: [%s] "
274 "can't decode reply body!\n",
275 inet_ntoa(sin->sin_addr));
289 * Notify operation for a single list entry
292 process_entry(int sockfd, notify_list *lp)
294 struct sockaddr_in sin;
295 struct status new_status;
298 u_int32_t proc, vers, prog;
299 /* __u32 proc, vers, prog; */
301 if (lp->addr.s_addr == INADDR_ANY && !try_to_resolve(lp))
303 if (NL_TIMES(lp) == 0) {
304 note(N_DEBUG, "Cannot notify %s, giving up.\n",
305 inet_ntoa(NL_ADDR(lp)));
309 memset(&sin, 0, sizeof(sin));
310 sin.sin_family = AF_INET;
311 sin.sin_port = lp->port;
312 /* LH - moved address into switch */
314 switch (NL_TYPE(lp)) {
320 /* Use source address for notify replies */
321 sin.sin_addr = lp->addr;
323 func = (xdrproc_t) xdr_stat_chge;
324 objp = &SM_stat_chge;
326 case NOTIFY_CALLBACK:
327 prog = NL_MY_PROG(lp);
328 vers = NL_MY_VERS(lp);
329 proc = NL_MY_PROC(lp);
331 /* __FORCE__ loopback for callbacks to lockd ... */
332 /* Just in case we somehow ignored it thus far */
333 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
335 func = (xdrproc_t) xdr_status;
337 new_status.mon_name = NL_MON_NAME(lp);
338 new_status.state = NL_STATE(lp);
339 memcpy(new_status.priv, NL_PRIV(lp), SM_PRIV_SIZE);
342 note(N_ERROR, "notify_host: unknown notify type %d",
347 lp->xid = xmit_call(sockfd, &sin, prog, vers, proc, func, objp);
349 note(N_WARNING, "notify_host: failed to notify %s\n",
350 inet_ntoa(lp->addr));
358 * Process a datagram received on the notify socket
361 process_reply(FD_SET_TYPE *rfds)
363 struct sockaddr_in sin;
367 if (sockfd == -1 || !FD_ISSET(sockfd, rfds))
370 if (!(lp = recv_rply(sockfd, &sin, &port)))
375 lp->port = htons((unsigned short) port);
376 process_entry(sockfd, lp);
377 NL_WHEN(lp) = time(NULL) + NOTIFY_TIMEOUT;
378 nlist_remove(¬ify, lp);
379 nlist_insert_timer(¬ify, lp);
382 note(N_WARNING, "recv_rply: [%s] service %d not registered",
384 NL_TYPE(lp) == NOTIFY_REBOOT? SM_PROG : NL_MY_PROG(lp));
385 } else if (NL_TYPE(lp) == NOTIFY_REBOOT) {
386 dprintf(N_DEBUG, "Notification of %s succeeded.",
388 xunlink(SM_BAK_DIR, NL_MON_NAME(lp), 0);
390 dprintf(N_DEBUG, "Callback to %s (for %d) succeeded.",
391 NL_MY_NAME(lp), NL_MON_NAME(lp));
393 nlist_free(¬ify, lp);
398 * Process a notify list, either for notifying remote hosts after reboot
399 * or for calling back (local) statd clients when the remote has notified
403 process_notify_list(void)
409 if ((fd = statd_get_socket(0)) < 0)
412 while ((entry = notify) != NULL && NL_WHEN(entry) < time(&now)) {
413 if (process_entry(fd, entry)) {
414 NL_WHEN(entry) = time(NULL) + NOTIFY_TIMEOUT;
415 nlist_remove(¬ify, entry);
416 nlist_insert_timer(¬ify, entry);
417 } else if (NL_TYPE(entry) == NOTIFY_CALLBACK) {
419 "Can't callback %s (%d,%d), giving up.",
423 nlist_free(¬ify, entry);
426 "Can't notify %s, giving up.",
428 /* PRC: do the HA callout */
429 ha_callout("del-client", NL_MON_NAME(entry), NL_MY_NAME(entry), -1);
430 xunlink(SM_BAK_DIR, NL_MON_NAME(entry), 0);
431 nlist_free(¬ify, entry);