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/*
* support/nfs/export.c
*
* Add or delete an NFS export in knfsd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <sys/types.h>
#include <asm/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "nfslib.h"
#include "misc.h"
#include "xcommon.h"
/* if /proc/net/rpc/... exists, then
* write to it, as that interface is more stable.
* Write:
* client fsidtype fsid path
* to /proc/net/rpc/nfsd.fh/channel
* and
* client path expiry flags anonuid anongid fsid
* to /proc/net/rpc/nfsd.export/channel
*/
static int
exp_unexp(struct nfsctl_export *exp, int export)
{
char buf[RPC_CHAN_BUF_SIZE], *bp;
struct stat stb;
__u32 fsid;
char fsidstr[8];
__u16 dev;
__u32 inode;
int err = 0, f, blen;
f = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
if (f < 0) return -1;
bp = buf; blen = sizeof(buf);
qword_add(&bp, &blen, exp->ex_client);
qword_add(&bp, &blen, exp->ex_path);
if (export) {
qword_addint(&bp, &blen, 0x7fffffff);
qword_addint(&bp, &blen, exp->ex_flags);
qword_addint(&bp, &blen, exp->ex_anon_uid);
qword_addint(&bp, &blen, exp->ex_anon_gid);
qword_addint(&bp, &blen, exp->ex_dev);
} else
qword_addint(&bp, &blen, 1);
qword_addeol(&bp, &blen);
if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
err = -1;
close(f);
if (stat(exp->ex_path, &stb) != 0)
return -1;
f = open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY);
if (f < 0) return -1;
if (exp->ex_flags & NFSEXP_FSID) {
bp = buf; blen = sizeof(buf);
qword_add(&bp, &blen, exp->ex_client);
qword_addint(&bp, &blen, 1);
fsid = exp->ex_dev;
qword_addhex(&bp, &blen, (char*)&fsid, 4);
if (export) {
qword_addint(&bp, &blen, 0x7fffffff);
qword_add(&bp, &blen, exp->ex_path);
} else
qword_addint(&bp, &blen, 1);
qword_addeol(&bp, &blen);
if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
err = -1;
}
bp = buf; blen = sizeof(buf);
qword_add(&bp, &blen, exp->ex_client);
qword_addint(&bp, &blen, 0);
dev = htons(major(stb.st_dev)); memcpy(fsidstr, &dev, 2);
dev = htons(minor(stb.st_dev)); memcpy(fsidstr+2, &dev, 2);
inode = stb.st_ino; memcpy(fsidstr+4, &inode, 4);
qword_addhex(&bp, &blen, fsidstr, 8);
if (export) {
qword_addint(&bp, &blen, 0x7fffffff);
qword_add(&bp, &blen, exp->ex_path);
} else
qword_addint(&bp, &blen, 1);
qword_addeol(&bp, &blen);
if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
err = -1;
close(f);
return err;
}
int
nfsexport(struct nfsctl_export *exp)
{
struct nfsctl_arg arg;
int fd;
if ((fd=open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY))>= 0) {
close(fd);
return exp_unexp(exp, 1);
}
arg.ca_version = NFSCTL_VERSION;
memcpy(&arg.ca_export, exp, sizeof(arg.ca_export));
return nfsctl(NFSCTL_EXPORT, &arg, NULL);
}
int
nfsunexport(struct nfsctl_export *exp)
{
struct nfsctl_arg arg;
int fd;
if ((fd=open("/proc/net/rpc/nfsd.fh/channel", O_WRONLY))>= 0) {
close(fd);
return exp_unexp(exp, 0);
}
arg.ca_version = NFSCTL_VERSION;
memcpy(&arg.ca_export, exp, sizeof(arg.ca_export));
return nfsctl(NFSCTL_UNEXPORT, &arg, NULL);
}
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