/*
* Copyright (c) 1997-2004 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* 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 acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* %W% (Berkeley) %G%
*
* $Id: transp_sockets.c,v 1.6.2.11 2004/01/06 03:15:20 ezk Exp $
*
* Socket specific utilities.
* -Erez Zadok <ezk@cs.columbia.edu>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amu.h>
/*
* find the IP address that can be used to connect to the local host
*/
void
amu_get_myaddress(struct in_addr *iap)
{
struct sockaddr_in sin;
memset((char *) &sin, 0, sizeof(sin));
get_myaddress(&sin);
iap->s_addr = sin.sin_addr.s_addr;
}
/*
* How to bind to reserved ports.
*/
int
bind_resv_port(int so, u_short *pp)
{
struct sockaddr_in sin;
int rc;
u_short port;
memset((voidp) &sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
port = IPPORT_RESERVED;
do {
--port;
sin.sin_port = htons(port);
rc = bind(so, (struct sockaddr *) &sin, sizeof(sin));
} while (rc < 0 && (int) port > IPPORT_RESERVED / 2);
if (pp && rc == 0)
*pp = port;
return rc;
}
/*
* close a descriptor, Sockets style
*/
int
amu_close(int fd)
{
return close(fd);
}
/*
* Create an rpc client attached to the mount daemon.
*/
CLIENT *
get_mount_client(char *unused_host, struct sockaddr_in *sin, struct timeval *tv, int *sock, u_long mnt_version)
{
CLIENT *client;
/*
* First try a TCP socket
*/
if ((*sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) > 0) {
/*
* Bind to a privileged port
*/
if (bind_resv_port(*sock, (u_short *) 0) < 0)
plog(XLOG_ERROR, "can't bind privileged port (socket)");
/*
* Find mountd port to connect to.
* Connect to mountd.
* Create a tcp client.
*/
if ((sin->sin_port = htons(pmap_getport(sin, MOUNTPROG, mnt_version, IPPROTO_TCP))) != 0) {
if (connect(*sock, (struct sockaddr *) sin, sizeof(*sin)) >= 0
&& ((client = clnttcp_create(sin, MOUNTPROG, mnt_version, sock, 0, 0)) != NULL))
return client;
}
/*
* Failed so close socket
*/
(void) close(*sock);
} /* tcp socket opened */
/* TCP failed so try UDP */
if ((*sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
plog(XLOG_ERROR, "Can't create socket to connect to mountd: %m");
*sock = RPC_ANYSOCK;
return NULL;
}
/*
* Bind to a privileged port
*/
if (bind_resv_port(*sock, (u_short *) 0) < 0)
plog(XLOG_ERROR, "can't bind privileged port");
/*
* Zero out the port - make sure we recompute
*/
sin->sin_port = 0;
/*
* Make a UDP client
*/
if ((client = clntudp_create(sin, MOUNTPROG, mnt_version, *tv, sock)) == NULL) {
(void) close(*sock);
*sock = RPC_ANYSOCK;
return NULL;
}
#ifdef DEBUG
dlog("get_mount_client: Using udp, port %d", sin->sin_port);
#endif /* DEBUG */
return client;
}
/*
* find the address of the caller of an RPC procedure.
*/
struct sockaddr_in *
amu_svc_getcaller(SVCXPRT *xprt)
{
/* glibc 2.2 returns a sockaddr_storage ??? */
return (struct sockaddr_in *)svc_getcaller(xprt);
}
/*
* Create the nfs service for amd
*/
int
create_nfs_service(int *soNFSp, u_short *nfs_portp, SVCXPRT **nfs_xprtp, void (*dispatch_fxn)(struct svc_req *rqstp, SVCXPRT *transp))
{
*soNFSp = socket(AF_INET, SOCK_DGRAM, 0);
if (*soNFSp < 0 || bind_resv_port(*soNFSp, NULL) < 0) {
plog(XLOG_FATAL, "Can't create privileged nfs port (socket)");
return 1;
}
if ((*nfs_xprtp = svcudp_create(*soNFSp)) == NULL) {
plog(XLOG_FATAL, "cannot create rpc/udp service");
return 2;
}
if ((*nfs_portp = (*nfs_xprtp)->xp_port) >= IPPORT_RESERVED) {
plog(XLOG_FATAL, "Can't create privileged nfs port");
return 1;
}
if (!svc_register(*nfs_xprtp, NFS_PROGRAM, NFS_VERSION, dispatch_fxn, 0)) {
plog(XLOG_FATAL, "unable to register (%ld, %ld, 0)",
(u_long) NFS_PROGRAM, (u_long) NFS_VERSION);
return 3;
}
return 0; /* all is well */
}
/*
* Create the amq service for amd (both TCP and UDP)
*/
int
create_amq_service(int *udp_soAMQp, SVCXPRT **udp_amqpp, int *tcp_soAMQp, SVCXPRT **tcp_amqpp)
{
/* first create TCP service */
if (tcp_soAMQp) {
*tcp_soAMQp = socket(AF_INET, SOCK_STREAM, 0);
if (*tcp_soAMQp < 0) {
plog(XLOG_FATAL, "cannot create tcp socket for amq service: %m");
return 1;
}
/* now create RPC service handle for amq */
if (tcp_amqpp &&
(*tcp_amqpp = svctcp_create(*tcp_soAMQp, AMQ_SIZE, AMQ_SIZE)) == NULL) {
plog(XLOG_FATAL, "cannot create tcp service for amq: soAMQp=%d", *tcp_soAMQp);
return 2;
}
#ifdef SVCSET_CONNMAXREC
/*
* This is *BSD at its best.
* They just had to do things differently than everyone else
* so they fixed a library DoS issue by forcing client-side changes...
*/
# ifndef RPC_MAXDATASIZE
# define RPC_MAXDATASIZE 9000
# endif /* not RPC_MAXDATASIZE */
{
int maxrec = RPC_MAXDATASIZE;
SVC_CONTROL(*tcp_amqpp, SVCSET_CONNMAXREC, &maxrec);
}
#endif /* not SVCSET_CONNMAXREC */
}
/* next create UDP service */
if (udp_soAMQp) {
*udp_soAMQp = socket(AF_INET, SOCK_DGRAM, 0);
if (*udp_soAMQp < 0) {
plog(XLOG_FATAL, "cannot create udp socket for amq service: %m");
return 3;
}
/* now create RPC service handle for amq */
if (udp_amqpp &&
(*udp_amqpp = svcudp_bufcreate(*udp_soAMQp, AMQ_SIZE, AMQ_SIZE)) == NULL) {
plog(XLOG_FATAL, "cannot create udp service for amq: soAMQp=%d", *udp_soAMQp);
return 4;
}
}
return 0; /* all is well */
}
/*
* Ping the portmapper on a remote system by calling the nullproc
*/
enum clnt_stat
pmap_ping(struct sockaddr_in *address)
{
CLIENT *client;
enum clnt_stat clnt_stat = RPC_TIMEDOUT; /* assume failure */
int socket = RPC_ANYSOCK;
struct timeval timeout;
timeout.tv_sec = 3;
timeout.tv_usec = 0;
address->sin_port = htons(PMAPPORT);
client = clntudp_create(address, PMAPPROG, PMAPVERS, timeout, &socket);
if (client != (CLIENT *) NULL) {
clnt_stat = clnt_call(client,
PMAPPROC_NULL,
(XDRPROC_T_TYPE) xdr_void,
NULL,
(XDRPROC_T_TYPE) xdr_void,
NULL,
timeout);
clnt_destroy(client);
}
close(socket);
address->sin_port = 0;
return clnt_stat;
}
/*
* Find the best NFS version for a host and protocol.
*/
u_long
get_nfs_version(char *host, struct sockaddr_in *sin, u_long nfs_version, const char *proto)
{
CLIENT *clnt;
int again = 0;
enum clnt_stat clnt_stat;
struct timeval tv;
int sock;
/*
* If not set or set wrong, then try from NFS_VERS_MAX on down. If
* set, then try from nfs_version on down.
*/
if (nfs_version <= 0 || nfs_version > NFS_VERS_MAX) {
nfs_version = NFS_VERS_MAX;
again = 1;
}
tv.tv_sec = 3; /* retry every 3 seconds, but also timeout */
tv.tv_usec = 0;
/*
* First check if remote portmapper is up (verify if remote host is up).
*/
clnt_stat = pmap_ping(sin);
if (clnt_stat == RPC_TIMEDOUT) {
plog(XLOG_ERROR, "get_nfs_version: failed to contact portmapper on host \"%s\": %s", host, clnt_sperrno(clnt_stat));
return 0;
}
#ifdef HAVE_FS_NFS3
try_again:
#endif /* HAVE_FS_NFS3 */
sock = RPC_ANYSOCK;
if (STREQ(proto, "tcp"))
clnt = clnttcp_create(sin, NFS_PROGRAM, nfs_version, &sock, 0, 0);
else if (STREQ(proto, "udp"))
clnt = clntudp_create(sin, NFS_PROGRAM, nfs_version, tv, &sock);
else
clnt = NULL;
if (clnt == NULL) {
#ifdef HAVE_CLNT_SPCREATEERROR
plog(XLOG_INFO, "get_nfs_version NFS(%d,%s) failed for %s: %s",
(int) nfs_version, proto, host, clnt_spcreateerror(""));
#else /* not HAVE_CLNT_SPCREATEERROR */
plog(XLOG_INFO, "get_nfs_version NFS(%d,%s) failed for %s",
(int) nfs_version, proto, host);
#endif /* not HAVE_CLNT_SPCREATEERROR */
return 0;
}
/* Try a couple times to verify the CLIENT handle. */
tv.tv_sec = 6;
clnt_stat = clnt_call(clnt,
NFSPROC_NULL,
(XDRPROC_T_TYPE) xdr_void,
0,
(XDRPROC_T_TYPE) xdr_void,
0,
tv);
close(sock);
clnt_destroy(clnt);
if (clnt_stat != RPC_SUCCESS) {
if (again) {
#ifdef HAVE_FS_NFS3
if (nfs_version == NFS_VERSION3) {
plog(XLOG_INFO, "get_nfs_version trying a lower version");
nfs_version = NFS_VERSION;
again = 0;
}
goto try_again;
#endif /* HAVE_FS_NFS3 */
}
plog(XLOG_INFO, "get_nfs_version NFS(%d,%s) failed for %s",
(int) nfs_version, proto, host);
return 0;
}
plog(XLOG_INFO, "get_nfs_version: returning (%d,%s) on host %s",
(int) nfs_version, proto, host);
return nfs_version;
}
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