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Test both the NFS and MOUNT protocols for v3 support before allowing a v3

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mount.  It is possible to have v3 MOUNT but only v2 NFS, for instance for
a custom user-mode server like CFS.

Reviewed by:	"Louis A. Mamakos" <louie@TransSys.COM>
This commit is contained in:
Doug Rabson 1997-05-01 12:30:02 +00:00
parent c190e1506b
commit 86dd941a5c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=25348
1 changed files with 61 additions and 1 deletions
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62
sbin/mount_nfs/mount_nfs.c
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@ -45,7 +45,7 @@ static char copyright[] =
static char sccsid[] = "@(#)mount_nfs.c 8.11 (Berkeley) 5/4/95";
*/
static const char rcsid[] =
"$Id: mount_nfs.c,v 1.20 1997/04/02 11:30:44 dfr Exp $";
"$Id: mount_nfs.c,v 1.21 1997/04/18 16:23:10 dfr Exp $";
#endif /* not lint */
#include <sys/param.h>
@ -568,6 +568,52 @@ main(argc, argv)
exit(0);
}
/*
* Return RPC_SUCCESS if server responds.
*/
enum clnt_stat
pingnfsserver(addr, version, sotype)
struct sockaddr_in *addr;
int version;
int sotype;
{
struct sockaddr_in sin;
int tport;
CLIENT *clp;
int so = RPC_ANYSOCK;
enum clnt_stat stat;
struct timeval pertry, try;
sin = *addr;
if ((tport = port_no ? port_no :
pmap_getport(&sin, RPCPROG_NFS, version, nfsproto)) == 0) {
return rpc_createerr.cf_stat;
}
sin.sin_port = htons(tport);
pertry.tv_sec = 10;
pertry.tv_usec = 0;
if (sotype == SOCK_STREAM)
clp = clnttcp_create(&sin, RPCPROG_NFS, version,
&so, 0, 0);
else
clp = clntudp_create(&sin, RPCPROG_NFS, version,
pertry, &so);
if (clp == NULL)
return rpc_createerr.cf_stat;
try.tv_sec = 10;
try.tv_usec = 0;
stat = clnt_call(clp, NFSPROC_NULL,
xdr_void, NULL, xdr_void, NULL, try);
clnt_destroy(clp);
return stat;
}
int
getnfsargs(spec, nfsargsp)
char *spec;
@ -685,6 +731,20 @@ getnfsargs(spec, nfsargsp)
if ((opflags & ISBGRND) == 0)
clnt_pcreateerror("NFS Portmap");
} else {
/*
* First ping the nfs server to see if it supports
* the version of the protocol we want to use.
*/
clnt_stat = pingnfsserver(&saddr, nfsvers,
nfsargsp->sotype);
if (clnt_stat == RPC_PROGVERSMISMATCH) {
if (mountmode == ANY) {
mountmode = V2;
goto tryagain;
} else {
errx(1, "Can't contact NFS server");
}
}
saddr.sin_port = 0;
pertry.tv_sec = 10;
pertry.tv_usec = 0;