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>
42 #define MAXMSGSIZE (2048 / sizeof(unsigned int))
44 static unsigned long xid = 0; /* RPC XID counter */
45 static int sockfd = -1; /* notify socket */
48 * Initialize callback socket
51 statd_get_socket(int port)
53 struct sockaddr_in sin;
58 if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
59 log(L_CRIT, "Can't create socket: %m");
63 FD_SET(sockfd, &SVC_FDSET);
65 memset(&sin, 0, sizeof(sin));
66 sin.sin_family = AF_INET;
68 if (bindresvport(sockfd, &sin) < 0) {
70 "process_hosts: can't bind to reserved port\n");
77 * Try to resolve host name for notify/callback request
79 * When compiled with RESTRICTED_STATD defined, we expect all
80 * host names to be dotted quads. See monitor.c for details. --okir
82 #ifdef RESTRICTED_STATD
84 try_to_resolve(notify_list *lp)
88 if (NL_TYPE(lp) == NOTIFY_REBOOT)
89 hname = NL_MON_NAME(lp);
91 hname = NL_MY_NAME(lp);
92 if (!inet_aton(hname, &(NL_ADDR(lp)))) {
93 log(L_ERROR, "%s is not an dotted-quad address", hname);
98 /* XXX: In order to handle multi-homed hosts, we could do
99 * a reverse lookup, a forward lookup, and cycle through
106 try_to_resolve(notify_list *lp)
111 if (NL_TYPE(lp) == NOTIFY_REBOOT)
112 hname = NL_MON_NAME(lp);
114 hname = NL_MY_NAME(lp);
116 dprintf(L_DEBUG, "Trying to resolve %s.", hname);
117 if (!(hp = gethostbyname(hname))) {
118 herror("gethostbyname");
123 if (hp->h_addrtype != AF_INET) {
124 log(L_ERROR, "%s is not an AF_INET address", hname);
129 /* FIXME: should try all addresses for multi-homed hosts in
130 * alternation because one interface might be down/unreachable. */
131 NL_ADDR(lp) = *(struct in_addr *) hp->h_addr;
133 dprintf(L_DEBUG, "address of %s is %s", hname, inet_ntoa(NL_ADDR(lp)));
139 xmit_call(int sockfd, struct sockaddr_in *sin,
140 u_int32_t prog, u_int32_t vers, u_int32_t proc,
141 xdrproc_t func, void *obj)
142 /* __u32 prog, __u32 vers, __u32 proc, xdrproc_t func, void *obj) */
144 unsigned int msgbuf[MAXMSGSIZE], msglen;
147 XDR xdr, *xdrs = &xdr;
151 xid = getpid() + time(NULL);
154 mesg.rm_direction = CALL;
155 mesg.rm_call.cb_rpcvers = 2;
156 if (sin->sin_port == 0) {
157 sin->sin_port = htons(PMAPPORT);
158 mesg.rm_call.cb_prog = PMAPPROG;
159 mesg.rm_call.cb_vers = PMAPVERS;
160 mesg.rm_call.cb_proc = PMAPPROC_GETPORT;
163 pmap.pm_prot = IPPROTO_UDP;
165 func = (xdrproc_t) xdr_pmap;
168 mesg.rm_call.cb_prog = prog;
169 mesg.rm_call.cb_vers = vers;
170 mesg.rm_call.cb_proc = proc;
172 mesg.rm_call.cb_cred.oa_flavor = AUTH_NULL;
173 mesg.rm_call.cb_cred.oa_base = (caddr_t) NULL;
174 mesg.rm_call.cb_cred.oa_length = 0;
175 mesg.rm_call.cb_verf.oa_flavor = AUTH_NULL;
176 mesg.rm_call.cb_verf.oa_base = (caddr_t) NULL;
177 mesg.rm_call.cb_verf.oa_length = 0;
179 /* Create XDR memory object for encoding */
180 xdrmem_create(xdrs, (caddr_t) msgbuf, sizeof(msgbuf), XDR_ENCODE);
182 /* Encode the RPC header part and payload */
183 if (!xdr_callmsg(xdrs, &mesg) || !func(xdrs, obj)) {
184 dprintf(L_WARNING, "xmit_mesg: can't encode RPC message!\n");
189 /* Get overall length of datagram */
190 msglen = xdr_getpos(xdrs);
192 if ((err = sendto(sockfd, msgbuf, msglen, 0,
193 (struct sockaddr *) sin, sizeof(*sin))) < 0) {
194 dprintf(L_WARNING, "xmit_mesg: sendto failed: %m");
195 } else if (err != msglen) {
196 dprintf(L_WARNING, "xmit_mesg: short write: %m\n");
201 return err == msglen? xid : 0;
205 recv_rply(int sockfd, struct sockaddr_in *sin, u_long *portp)
207 unsigned int msgbuf[MAXMSGSIZE], msglen;
209 notify_list *lp = NULL;
210 XDR xdr, *xdrs = &xdr;
211 int alen = sizeof(*sin);
213 /* Receive message */
214 if ((msglen = recvfrom(sockfd, msgbuf, sizeof(msgbuf), 0,
215 (struct sockaddr *) sin, &alen)) < 0) {
216 dprintf(L_WARNING, "recv_rply: recvfrom failed: %m");
220 /* Create XDR object for decoding buffer */
221 xdrmem_create(xdrs, (caddr_t) msgbuf, msglen, XDR_DECODE);
223 memset(&mesg, 0, sizeof(mesg));
224 mesg.rm_reply.rp_acpt.ar_results.where = NULL;
225 mesg.rm_reply.rp_acpt.ar_results.proc = (xdrproc_t) xdr_void;
227 if (!xdr_replymsg(xdrs, &mesg)) {
228 log(L_WARNING, "recv_rply: can't decode RPC message!\n");
232 if (mesg.rm_reply.rp_stat != 0) {
233 log(L_WARNING, "recv_rply: [%s] RPC status %d\n",
234 inet_ntoa(sin->sin_addr),
235 mesg.rm_reply.rp_stat);
238 if (mesg.rm_reply.rp_acpt.ar_stat != 0) {
239 log(L_WARNING, "recv_rply: [%s] RPC status %d\n",
240 inet_ntoa(sin->sin_addr),
241 mesg.rm_reply.rp_acpt.ar_stat);
245 for (lp = notify; lp != NULL; lp = lp->next) {
246 /* LH - this was a bug... it should have been checking
247 * the xid from the response message from the client,
248 * not the static, internal xid */
249 if (lp->xid != mesg.rm_xid)
251 if (lp->addr.s_addr != sin->sin_addr.s_addr) {
253 strncpy (addr, inet_ntoa(lp->addr),
255 addr [sizeof (addr) - 1] = '\0';
256 dprintf(L_WARNING, "address mismatch: "
257 "expected %s, got %s\n",
258 addr, inet_ntoa(sin->sin_addr));
261 if (!xdr_u_long(xdrs, portp)) {
262 log(L_WARNING, "recv_rply: [%s] "
263 "can't decode reply body!\n",
264 inet_ntoa(sin->sin_addr));
278 * Notify operation for a single list entry
281 process_entry(int sockfd, notify_list *lp)
283 struct sockaddr_in sin;
284 struct status new_status;
287 u_int32_t proc, vers, prog;
288 /* __u32 proc, vers, prog; */
290 if (lp->addr.s_addr == INADDR_ANY && !try_to_resolve(lp))
292 if (NL_TIMES(lp) == 0) {
293 log(L_DEBUG, "Cannot notify %s, giving up.\n",
294 inet_ntoa(NL_ADDR(lp)));
298 memset(&sin, 0, sizeof(sin));
299 sin.sin_family = AF_INET;
300 sin.sin_port = lp->port;
301 /* LH - moved address into switch */
303 switch (NL_TYPE(lp)) {
309 /* Use source address for notify replies */
310 sin.sin_addr = lp->addr;
312 func = (xdrproc_t) xdr_stat_chge;
313 objp = &SM_stat_chge;
315 case NOTIFY_CALLBACK:
316 prog = NL_MY_PROG(lp);
317 vers = NL_MY_VERS(lp);
318 proc = NL_MY_PROC(lp);
320 /* __FORCE__ loopback for callbacks to lockd ... */
321 /* Just in case we somehow ignored it thus far */
322 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
324 func = (xdrproc_t) xdr_status;
326 new_status.mon_name = NL_MON_NAME(lp);
327 new_status.state = NL_STATE(lp);
328 memcpy(new_status.priv, NL_PRIV(lp), SM_PRIV_SIZE);
331 log(L_ERROR, "notify_host: unknown notify type %d",
336 lp->xid = xmit_call(sockfd, &sin, prog, vers, proc, func, objp);
338 log(L_WARNING, "notify_host: failed to notify %s\n",
339 inet_ntoa(lp->addr));
347 * Process a datagram received on the notify socket
350 process_reply(FD_SET_TYPE *rfds)
352 struct sockaddr_in sin;
356 if (sockfd == -1 || !FD_ISSET(sockfd, rfds))
359 if (!(lp = recv_rply(sockfd, &sin, &port)))
364 lp->port = htons((unsigned short) port);
365 process_entry(sockfd, lp);
366 NL_WHEN(lp) = time(NULL) + NOTIFY_TIMEOUT;
367 nlist_remove(¬ify, lp);
368 nlist_insert_timer(¬ify, lp);
371 log(L_WARNING, "recv_rply: [%s] service %d not registered",
373 NL_TYPE(lp) == NOTIFY_REBOOT? SM_PROG : NL_MY_PROG(lp));
374 } else if (NL_TYPE(lp) == NOTIFY_REBOOT) {
375 dprintf(L_DEBUG, "Notification of %s succeeded.",
377 xunlink(SM_BAK_DIR, NL_MON_NAME(lp), 0);
379 dprintf(L_DEBUG, "Callback to %s (for %d) succeeded.",
380 NL_MY_NAME(lp), NL_MON_NAME(lp));
382 nlist_free(¬ify, lp);
387 * Process a notify list, either for notifying remote hosts after reboot
388 * or for calling back (local) statd clients when the remote has notified
392 process_notify_list(void)
398 if ((fd = statd_get_socket(0)) < 0)
401 while ((entry = notify) != NULL && NL_WHEN(entry) < time(&now)) {
402 if (process_entry(fd, entry)) {
403 NL_WHEN(entry) = time(NULL) + NOTIFY_TIMEOUT;
404 nlist_remove(¬ify, entry);
405 nlist_insert_timer(¬ify, entry);
406 } else if (NL_TYPE(entry) == NOTIFY_CALLBACK) {
408 "Can't callback %s (%d,%d), giving up.",
412 nlist_free(¬ify, entry);
415 "Can't notify %s, giving up.",
417 xunlink(SM_BAK_DIR, NL_MON_NAME(entry), 0);
418 nlist_free(¬ify, entry);