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/*
* support/export/xtab.c
*
* Interface to the xtab file.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include "config.h"
#include <sys/fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "xmalloc.h"
#include "nfslib.h"
#include "exportfs.h"
#include "xio.h"
#include "xlog.h"
static int
xtab_read(char *xtab, int is_export)
{
struct exportent *xp;
nfs_export *exp;
int lockid;
if ((lockid = xflock(xtab, "r")) < 0)
return 0;
setexportent(xtab, "r");
while ((xp = getexportent()) != NULL) {
if (!(exp = export_lookup(xp->e_hostname, xp->e_path)) &&
!(exp = export_create(xp))) {
continue;
}
if (is_export) {
exp->m_xtabent = 1;
exp->m_mayexport = 1;
} else
exp->m_exported = 1;
}
endexportent();
xfunlock(lockid);
return 0;
}
int
xtab_mount_read(void)
{
int fd;
if ((fd=open(_PATH_PROC_EXPORTS, O_RDONLY))>=0) {
close(fd);
return xtab_read(_PATH_PROC_EXPORTS, 0);
} else
return xtab_read(_PATH_XTAB, 1);
}
int
xtab_export_read(void)
{
return xtab_read(_PATH_ETAB, 1);
}
static int
xtab_write(char *xtab, char *xtabtmp, int is_export)
{
struct exportent xe;
nfs_export *exp;
int lockid, i;
if ((lockid = xflock(xtab, "w")) < 0) {
xlog(L_ERROR, "can't lock %s for writing", xtab);
return 0;
}
setexportent(xtabtmp, "w");
for (i = 0; i < MCL_MAXTYPES; i++) {
for (exp = exportlist[i]; exp; exp = exp->m_next) {
if (is_export && !exp->m_xtabent)
continue;
if (!is_export && ! exp->m_exported)
continue;
/* write out the export entry using the FQDN */
xe = exp->m_export;
strncpy(xe.e_hostname,
exp->m_client->m_hostname,
sizeof (xe.e_hostname) - 1);
xe.e_hostname[sizeof (xe.e_hostname) - 1] = '\0';
putexportent(&xe);
}
}
endexportent();
rename(xtabtmp, xtab);
xfunlock(lockid);
return 1;
}
int
xtab_export_write()
{
return xtab_write(_PATH_ETAB, _PATH_ETABTMP, 1);
}
int
xtab_mount_write()
{
return xtab_write(_PATH_XTAB, _PATH_XTABTMP, 0);
}
void
xtab_append(nfs_export *exp)
{
struct exportent xe;
int lockid;
if ((lockid = xflock(_PATH_XTAB, "w")) < 0)
return;
setexportent(_PATH_XTAB, "a");
xe = exp->m_export;
strncpy(xe.e_hostname, exp->m_client->m_hostname,
sizeof (xe.e_hostname) - 1);
xe.e_hostname[sizeof (xe.e_hostname) - 1] = '\0';
putexportent(&xe);
endexportent();
xfunlock(lockid);
exp->m_xtabent = 1;
}
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