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/*
* conn.c -- NFS client mount / umount connection code support functions
*
* 2006-06-06 Amit Gud <agud@redhat.com>
* - Moved code snippets to nfs-utils/support/nfs from util-linux/mount/nfsmount.c
*
*/
#include "config.h"
#include <errno.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "conn.h"
#if SIZEOF_SOCKLEN_T - 0 == 0
#define socklen_t int
#endif
extern int verbose;
/* Map an NFS version into the corresponding Mountd version */
u_long nfsvers_to_mnt(const u_long vers)
{
static const u_long nfs_to_mnt[] = { 0, 0, 1, 3 };
if (vers <= 3)
return nfs_to_mnt[vers];
return 0;
}
/* Map a Mountd version into the corresponding NFS version */
u_long mntvers_to_nfs(const u_long vers)
{
static const u_long mnt_to_nfs[] = { 0, 2, 2, 3 };
if (vers <= 3)
return mnt_to_nfs[vers];
return 0;
}
/*
* Create a socket that is locally bound to a
* reserve or non-reserve port. For any failures,
* RPC_ANYSOCK is returned which will cause
* the RPC code to create the socket instead.
*/
int get_socket(struct sockaddr_in *saddr, u_int p_prot, int resvp)
{
int so, cc, type;
struct sockaddr_in laddr;
socklen_t namelen = sizeof(laddr);
type = (p_prot == IPPROTO_UDP ? SOCK_DGRAM : SOCK_STREAM);
if ((so = socket (AF_INET, type, p_prot)) < 0) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
if (verbose) {
fprintf(stderr,
"mount: Unable to create %s socket: errno %d (%s)\n",
p_prot == IPPROTO_UDP ? "UDP" : "TCP",
errno, strerror(errno));
}
return RPC_ANYSOCK;
}
laddr.sin_family = AF_INET;
laddr.sin_port = 0;
laddr.sin_addr.s_addr = htonl(INADDR_ANY);
if (resvp) {
if (bindresvport(so, &laddr) < 0) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
if (verbose) {
fprintf(stderr,
"mount: Unable to bindresvport %s socket: errno %d (%s)\n",
p_prot == IPPROTO_UDP ? "UDP" : "TCP",
errno, strerror(errno));
}
close(so);
return RPC_ANYSOCK;
}
} else {
cc = bind(so, (struct sockaddr *)&laddr, namelen);
if (cc < 0) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
if (verbose) {
fprintf(stderr,
"mount: Unable to bind to %s socket: errno %d (%s)\n",
p_prot == IPPROTO_UDP ? "UDP" : "TCP",
errno, strerror(errno));
}
close(so);
return RPC_ANYSOCK;
}
}
if (type == SOCK_STREAM || type == SOCK_DGRAM) {
cc = connect(so, (struct sockaddr *)saddr, namelen);
if (cc < 0) {
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
if (verbose) {
fprintf(stderr,
"mount: Unable to connect to %s:%d, errno %d (%s)\n",
inet_ntoa(saddr->sin_addr), ntohs(saddr->sin_port),
errno, strerror(errno));
}
close(so);
return RPC_ANYSOCK;
}
}
return so;
}
/*
* Sigh... getport() doesn't actually check the version number.
* In order to make sure that the server actually supports the service
* we're requesting, we open and RPC client, and fire off a NULL
* RPC call.
*/
int
clnt_ping(struct sockaddr_in *saddr, const u_long prog, const u_long vers,
const u_int prot, struct sockaddr_in *caddr)
{
CLIENT *clnt=NULL;
int sock, stat;
static char clnt_res;
rpc_createerr.cf_stat = stat = errno = 0;
sock = get_socket(saddr, prot, FALSE);
if (sock == RPC_ANYSOCK && errno == ETIMEDOUT) {
/*
* TCP timeout. Bubble up the error to see
* how it should be handled.
*/
rpc_createerr.cf_stat = RPC_TIMEDOUT;
goto out_bad;
}
switch(prot) {
case IPPROTO_UDP:
clnt = clntudp_bufcreate(saddr, prog, vers,
RETRY_TIMEOUT, &sock,
RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
break;
case IPPROTO_TCP:
clnt = clnttcp_create(saddr, prog, vers, &sock,
RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
break;
default:
goto out_bad;
}
if (!clnt)
goto out_bad;
memset(&clnt_res, 0, sizeof(clnt_res));
stat = clnt_call(clnt, NULLPROC,
(xdrproc_t)xdr_void, (caddr_t)NULL,
(xdrproc_t)xdr_void, (caddr_t)&clnt_res,
TIMEOUT);
if (stat) {
clnt_geterr(clnt, &rpc_createerr.cf_error);
rpc_createerr.cf_stat = stat;
}
clnt_destroy(clnt);
if (sock != -1) {
if (caddr) {
/* Get the address of our end of this connection */
socklen_t len = sizeof(*caddr);
if (getsockname(sock, caddr, &len) != 0)
caddr->sin_family = 0;
}
close(sock);
}
if (stat == RPC_SUCCESS)
return 1;
out_bad:
return 0;
}
CLIENT *mnt_openclnt(clnt_addr_t *mnt_server, int *msock)
{
struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
struct pmap *mnt_pmap = &mnt_server->pmap;
CLIENT *clnt = NULL;
/* contact the mount daemon via TCP */
mnt_saddr->sin_port = htons((u_short)mnt_pmap->pm_port);
*msock = get_socket(mnt_saddr, mnt_pmap->pm_prot, TRUE);
switch (mnt_pmap->pm_prot) {
case IPPROTO_UDP:
clnt = clntudp_bufcreate(mnt_saddr,
mnt_pmap->pm_prog, mnt_pmap->pm_vers,
RETRY_TIMEOUT, msock,
MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
break;
case IPPROTO_TCP:
clnt = clnttcp_create(mnt_saddr,
mnt_pmap->pm_prog, mnt_pmap->pm_vers,
msock,
MNT_SENDBUFSIZE, MNT_RECVBUFSIZE);
break;
}
if (clnt) {
/* try to mount hostname:dirname */
clnt->cl_auth = authunix_create_default();
return clnt;
}
return NULL;
}
void mnt_closeclnt(CLIENT *clnt, int msock)
{
auth_destroy(clnt->cl_auth);
clnt_destroy(clnt);
close(msock);
}
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