2 * Copyright (c) 1997-2014 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * File: am-utils/conf/transp/transp_sockets.c
38 * Socket specific utilities.
39 * -Erez Zadok <ezk@cs.columbia.edu>
44 #endif /* HAVE_CONFIG_H */
50 * find the IP address that can be used to connect to the local host
53 amu_get_myaddress(struct in_addr *iap, const char *preferred_localhost)
59 #error this code is old and probably not useful any longer.
60 #error Erez, Jan 21, 2004.
61 struct sockaddr_in sin;
64 * Most modern systems should use 127.0.0.1 as the localhost address over
65 * which you can do NFS mounts. In the past we found that some NFS
66 * clients may not allow mounts from localhost. So we used
67 * get_myaddress() and that seemed to work. Alas, on some other systems,
68 * get_myaddress() may return one of the interface addresses at random,
69 * and thus use a less efficient IP address than 127.0.0.1. The solution
70 * is to hard-code 127.0.0.1, but still check if get_myaddress() returns a
71 * different value and warn about it.
73 memset((char *) &sin, 0, sizeof(sin));
75 if (sin.sin_addr.s_addr != htonl(INADDR_LOOPBACK))
76 dlog("amu_get_myaddress: myaddress conflict (0x%x vs. 0x%lx)",
77 sin.sin_addr.s_addr, (u_long) htonl(INADDR_LOOPBACK));
78 #endif /* DEBUG_off */
80 if (preferred_localhost == NULL)
83 /* if specified preferred locahost, then try to use it */
84 hp = gethostbyname(preferred_localhost);
86 /* XXX: if hstrerror()/h_errno aren't portable, then need to port the next statement */
87 plog(XLOG_ERROR, "Unable to resolve localhost_address \"%s\" (%s): using default",
88 preferred_localhost, hstrerror(h_errno));
91 if (hp->h_addr_list == NULL) {
92 plog(XLOG_ERROR, "localhost_address \"%s\" has no IP addresses: using default",
96 if (hp->h_addr_list[1] != NULL) {
97 plog(XLOG_ERROR, "localhost_address \"%s\" has more than one IP addresses: using first",
101 memmove((voidp) &iap->s_addr, (voidp) hp->h_addr_list[0], sizeof(iap->s_addr));
102 plog(XLOG_INFO, "localhost_address \"%s\" requested, using %s",
103 preferred_localhost, inet_dquad(dq, sizeof(dq), iap->s_addr));
107 iap->s_addr = htonl(INADDR_LOOPBACK);
112 * How to bind to reserved ports.
113 * Note: if *pp is non-null and is greater than 0, then *pp will not be modified.
116 bind_resv_port(int so, u_short *pp)
118 struct sockaddr_in sin;
122 memset((voidp) &sin, 0, sizeof(sin));
123 sin.sin_family = AF_INET;
126 sin.sin_port = htons(*pp);
127 rc = bind(so, (struct sockaddr *) &sin, sizeof(sin));
129 port = IPPORT_RESERVED;
133 sin.sin_port = htons(port);
134 rc = bind(so, (struct sockaddr *) &sin, sizeof(sin));
135 } while (rc < 0 && (int) port > IPPORT_RESERVED / 2);
146 * close a descriptor, Sockets style
156 * Create an rpc client attached to the mount daemon.
159 get_mount_client(char *unused_host, struct sockaddr_in *sin, struct timeval *tv, int *sock, u_long mnt_version)
164 * First try a TCP socket
166 if ((*sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) > 0) {
168 * Bind to a privileged port
170 if (bind_resv_port(*sock, (u_short *) NULL) < 0)
171 plog(XLOG_ERROR, "can't bind privileged port (socket)");
174 * Find mountd port to connect to.
176 * Create a tcp client.
178 if ((sin->sin_port = htons(pmap_getport(sin, MOUNTPROG, mnt_version, IPPROTO_TCP))) != 0) {
179 if (connect(*sock, (struct sockaddr *) sin, sizeof(*sin)) >= 0
180 && ((client = clnttcp_create(sin, MOUNTPROG, mnt_version, sock, 0, 0)) != NULL))
184 * Failed so close socket
187 } /* tcp socket opened */
188 /* TCP failed so try UDP */
189 if ((*sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
190 plog(XLOG_ERROR, "Can't create socket to connect to mountd: %m");
195 * Bind to a privileged port
197 if (bind_resv_port(*sock, (u_short *) NULL) < 0)
198 plog(XLOG_ERROR, "can't bind privileged port");
201 * Zero out the port - make sure we recompute
208 if ((client = clntudp_create(sin, MOUNTPROG, mnt_version, *tv, sock)) == NULL) {
213 dlog("get_mount_client: Using udp, port %d", sin->sin_port);
219 * find the address of the caller of an RPC procedure.
222 amu_svc_getcaller(SVCXPRT *xprt)
224 /* glibc 2.2 returns a sockaddr_storage ??? */
225 return (struct sockaddr_in *) svc_getcaller(xprt);
230 * Register an RPC server:
231 * return 1 on success, 0 otherwise.
234 amu_svc_register(SVCXPRT *xprt, u_long prognum, u_long versnum,
235 void (*dispatch)(struct svc_req *rqstp, SVCXPRT *transp),
236 u_long protocol, struct netconfig *dummy)
238 /* on Sockets: svc_register returns 1 on success, 0 otherwise */
239 return svc_register(xprt, prognum, versnum, dispatch, protocol);
244 * Create the nfs service for amd
247 create_nfs_service(int *soNFSp, u_short *nfs_portp, SVCXPRT **nfs_xprtp, void (*dispatch_fxn)(struct svc_req *rqstp, SVCXPRT *transp), u_long nfs_version)
249 *soNFSp = socket(AF_INET, SOCK_DGRAM, 0);
251 if (*soNFSp < 0 || bind_resv_port(*soNFSp, nfs_portp) < 0) {
252 plog(XLOG_FATAL, "Can't create privileged nfs port (socket)");
257 if ((*nfs_xprtp = svcudp_create(*soNFSp)) == NULL) {
258 plog(XLOG_FATAL, "cannot create rpc/udp service");
262 if ((*nfs_portp = (*nfs_xprtp)->xp_port) >= IPPORT_RESERVED) {
263 plog(XLOG_FATAL, "Can't create privileged nfs port");
264 svc_destroy(*nfs_xprtp);
268 if (!svc_register(*nfs_xprtp, NFS_PROGRAM, nfs_version, dispatch_fxn, 0)) {
269 plog(XLOG_FATAL, "unable to register (%lu, %lu, 0)",
270 (u_long) NFS_PROGRAM, nfs_version);
271 svc_destroy(*nfs_xprtp);
276 return 0; /* all is well */
281 * Create the amq service for amd (both TCP and UDP)
284 create_amq_service(int *udp_soAMQp,
286 struct netconfig **dummy1,
289 struct netconfig **dummy2,
290 u_short preferred_amq_port)
292 /* first create TCP service */
294 *tcp_soAMQp = socket(AF_INET, SOCK_STREAM, 0);
295 if (*tcp_soAMQp < 0) {
296 plog(XLOG_FATAL, "cannot create tcp socket for amq service: %m");
300 /* next, bind to a specific (TCP) port if asked for */
301 if (preferred_amq_port > 0) {
303 * Note: if &preferred_amq_port is non-null and is greater than 0,
304 * then the pointer will not be modified. We don't want it to be
305 * modified because it was passed down to create_amq_service as a
306 * non-pointer (a variable on the stack, not to be modified!)
308 if (bind_resv_port(*tcp_soAMQp, &preferred_amq_port) < 0) {
309 plog(XLOG_FATAL, "can't bind amq service to requested TCP port %d: %m)", preferred_amq_port);
314 /* now create RPC service handle for amq */
316 (*tcp_amqpp = svctcp_create(*tcp_soAMQp, AMQ_SIZE, AMQ_SIZE)) == NULL) {
317 plog(XLOG_FATAL, "cannot create tcp service for amq: soAMQp=%d", *tcp_soAMQp);
321 #ifdef SVCSET_CONNMAXREC
323 * This is *BSD at its best.
324 * They just had to do things differently than everyone else
325 * so they fixed a library DoS issue by forcing client-side changes...
327 # ifndef RPC_MAXDATASIZE
328 # define RPC_MAXDATASIZE 9000
329 # endif /* not RPC_MAXDATASIZE */
331 int maxrec = RPC_MAXDATASIZE;
332 SVC_CONTROL(*tcp_amqpp, SVCSET_CONNMAXREC, &maxrec);
334 #endif /* not SVCSET_CONNMAXREC */
337 /* next create UDP service */
339 *udp_soAMQp = socket(AF_INET, SOCK_DGRAM, 0);
340 if (*udp_soAMQp < 0) {
341 plog(XLOG_FATAL, "cannot create udp socket for amq service: %m");
345 /* next, bind to a specific (UDP) port if asked for */
346 if (preferred_amq_port > 0) {
348 * Note: see comment about using &preferred_amq_port above in this
351 if (bind_resv_port(*udp_soAMQp, &preferred_amq_port) < 0) {
352 plog(XLOG_FATAL, "can't bind amq service to requested UDP port %d: %m)", preferred_amq_port);
357 /* now create RPC service handle for amq */
359 (*udp_amqpp = svcudp_bufcreate(*udp_soAMQp, AMQ_SIZE, AMQ_SIZE)) == NULL) {
360 plog(XLOG_FATAL, "cannot create udp service for amq: soAMQp=%d", *udp_soAMQp);
365 return 0; /* all is well */
370 * Check if the portmapper is running and reachable: 0==down, 1==up
372 int check_pmap_up(char *host, struct sockaddr_in* sin)
375 enum clnt_stat clnt_stat = RPC_TIMEDOUT; /* assume failure */
376 int socket = RPC_ANYSOCK;
377 struct timeval timeout;
381 sin->sin_port = htons(PMAPPORT);
382 client = clntudp_create(sin, PMAPPROG, PMAPVERS, timeout, &socket);
384 if (client == (CLIENT *) NULL) {
386 "%s: cannot create connection to contact portmapper on host \"%s\"%s",
387 __func__, host, clnt_spcreateerror(""));
392 /* Ping the portmapper on a remote system by calling the nullproc */
393 clnt_stat = clnt_call(client,
395 (XDRPROC_T_TYPE) xdr_void,
397 (XDRPROC_T_TYPE) xdr_void,
400 clnt_destroy(client);
404 if (clnt_stat == RPC_TIMEDOUT) {
406 "%s: failed to contact portmapper on host \"%s\": %s",
407 __func__, host, clnt_sperrno(clnt_stat));
415 * Find the best NFS version for a host and protocol.
418 get_nfs_version(char *host, struct sockaddr_in *sin, u_long nfs_version, const char *proto, u_long def)
422 enum clnt_stat clnt_stat;
428 * If not set or set wrong, then try from NFS_VERS_MAX on down. If
429 * set, then try from nfs_version on down.
431 if (!nfs_valid_version(nfs_version)) {
432 if (nfs_valid_version(def))
435 nfs_version = NFS_VERS_MAX;
438 tv.tv_sec = 2; /* retry every 2 seconds, but also timeout */
441 for (; nfs_version >= NFS_VERS_MIN; nfs_version--) {
445 if (STREQ(proto, "tcp"))
446 clnt = clnttcp_create(sin, NFS_PROGRAM, nfs_version, &sock, 0, 0);
447 else if (STREQ(proto, "udp"))
448 clnt = clntudp_create(sin, NFS_PROGRAM, nfs_version, tv, &sock);
453 /* Try three times (6/2=3) to verify the CLIENT handle. */
455 clnt_stat = clnt_call(clnt,
457 (XDRPROC_T_TYPE) xdr_void,
459 (XDRPROC_T_TYPE) xdr_void,
463 if (clnt_stat != RPC_SUCCESS)
464 errstr = clnt_sperrno(clnt_stat);
468 if (clnt_stat == RPC_SUCCESS)
471 #ifdef HAVE_CLNT_SPCREATEERROR
472 errstr = clnt_spcreateerror("");
473 #else /* not HAVE_CLNT_SPCREATEERROR */
475 #endif /* not HAVE_CLNT_SPCREATEERROR */
479 plog(XLOG_INFO, "%s: NFS(%lu,%s) failed for %s: %s", __func__,
480 nfs_version, proto, host, errstr);
484 if (nfs_version < NFS_VERS_MIN)
487 plog(XLOG_INFO, "%s: returning NFS(%lu,%s) on host %s", __func__,
488 nfs_version, proto, host);
493 #if defined(HAVE_FS_AUTOFS) && defined(AUTOFS_PROG)
495 * Register the autofs service for amd
498 register_autofs_service(char *autofs_conftype, void (*autofs_dispatch)(struct svc_req *rqstp, SVCXPRT *transp))
501 SVCXPRT *autofs_xprt = NULL;
503 autofs_socket = socket(AF_INET, SOCK_DGRAM, 0);
505 if (autofs_socket < 0 || bind_resv_port(autofs_socket, NULL) < 0) {
506 plog(XLOG_FATAL, "Can't create privileged autofs port (socket)");
509 if ((autofs_xprt = svcudp_create(autofs_socket)) == NULL) {
510 plog(XLOG_FATAL, "Can't create autofs rpc/udp service");
513 if (autofs_xprt->xp_port >= IPPORT_RESERVED) {
514 plog(XLOG_FATAL, "Can't create privileged autofs port");
517 if (!svc_register(autofs_xprt, AUTOFS_PROG, AUTOFS_VERS, autofs_dispatch, 0)) {
518 plog(XLOG_FATAL, "unable to register (%ld, %ld, 0)",
519 (u_long) AUTOFS_PROG, (u_long) AUTOFS_VERS);
523 return 0; /* all is well */
528 unregister_autofs_service(char *autofs_conftype)
530 svc_unregister(AUTOFS_PROG, AUTOFS_VERS);
533 #endif /* HAVE_FS_AUTOFS && AUTOFS_PROG */