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/*
* utils/mountd/rmtab.c
*
* Manage the rmtab file for mountd.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include "xmalloc.h"
#include "misc.h"
#include "exportfs.h"
#include "xio.h"
#include "mountd.h"
#include "ha-callout.h"
#include <limits.h> /* PATH_MAX */
/* If new path is a link do not destroy it but place the
* file where the link points.
*/
static int
slink_safe_rename(const char * oldpath, const char * newpath)
{
int r;
struct stat s;
char slink_path[PATH_MAX];
const char *real_newpath = newpath;
if ((lstat(newpath, &s) == 0) && S_ISLNK(s.st_mode)) {
/* New path is a symbolic link, do not destroy but follow */
if ((r = readlink(newpath, slink_path, PATH_MAX - 1)) == -1)
return -1;
slink_path[r] = '\0';
real_newpath = slink_path;
}
return rename(oldpath, real_newpath);
}
void
mountlist_add(char *host, const char *path)
{
struct rmtabent xe;
struct rmtabent *rep;
int lockid;
long pos;
if ((lockid = xflock(_PATH_RMTAB, "a")) < 0)
return;
setrmtabent("r+");
while ((rep = getrmtabent(1, &pos)) != NULL) {
if (strcmp (rep->r_client,
host) == 0
&& strcmp(rep->r_path, path) == 0) {
rep->r_count++;
/* PRC: do the HA callout: */
ha_callout("mount", rep->r_client, rep->r_path, rep->r_count);
putrmtabent(rep, &pos);
endrmtabent();
xfunlock(lockid);
return;
}
}
endrmtabent();
strncpy(xe.r_client, host,
sizeof (xe.r_client) - 1);
xe.r_client [sizeof (xe.r_client) - 1] = '\0';
strncpy(xe.r_path, path, sizeof (xe.r_path) - 1);
xe.r_path [sizeof (xe.r_path) - 1] = '\0';
xe.r_count = 1;
if (setrmtabent("a")) {
/* PRC: do the HA callout: */
ha_callout("mount", xe.r_client, xe.r_path, xe.r_count);
putrmtabent(&xe, NULL);
endrmtabent();
}
xfunlock(lockid);
}
void
mountlist_del(char *hname, const char *path)
{
struct rmtabent *rep;
FILE *fp;
int lockid;
int match;
if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
return;
if (!setrmtabent("r")) {
xfunlock(lockid);
return;
}
if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
endrmtabent();
xfunlock(lockid);
return;
}
while ((rep = getrmtabent(1, NULL)) != NULL) {
match = !strcmp (rep->r_client, hname)
&& !strcmp(rep->r_path, path);
if (match) {
rep->r_count--;
/* PRC: do the HA callout: */
ha_callout("unmount", rep->r_client, rep->r_path, rep->r_count);
}
if (!match || rep->r_count)
fputrmtabent(fp, rep, NULL);
}
if (slink_safe_rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
xlog(L_ERROR, "couldn't rename %s to %s",
_PATH_RMTABTMP, _PATH_RMTAB);
}
endrmtabent(); /* close & unlink */
fendrmtabent(fp);
xfunlock(lockid);
}
void
mountlist_del_all(struct sockaddr_in *sin)
{
struct in_addr addr = sin->sin_addr;
struct hostent *hp;
struct rmtabent *rep;
nfs_export *exp;
FILE *fp;
int lockid;
if ((lockid = xflock(_PATH_RMTAB, "w")) < 0)
return;
if (!(hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
xlog(L_ERROR, "can't get hostname of %s", inet_ntoa(addr));
xfunlock(lockid);
return;
}
else
hp = hostent_dup (hp);
if (!setrmtabent("r")) {
xfunlock(lockid);
free (hp);
return;
}
if (!(fp = fsetrmtabent(_PATH_RMTABTMP, "w"))) {
endrmtabent();
xfunlock(lockid);
free (hp);
return;
}
while ((rep = getrmtabent(1, NULL)) != NULL) {
if (strcmp(rep->r_client, hp->h_name) == 0 &&
(exp = auth_authenticate("umountall", sin, rep->r_path))) {
export_reset(exp);
continue;
}
fputrmtabent(fp, rep, NULL);
}
if (slink_safe_rename(_PATH_RMTABTMP, _PATH_RMTAB) < 0) {
xlog(L_ERROR, "couldn't rename %s to %s",
_PATH_RMTABTMP, _PATH_RMTAB);
}
endrmtabent(); /* close & unlink */
fendrmtabent(fp);
xfunlock(lockid);
free (hp);
}
mountlist
mountlist_list(void)
{
static mountlist mlist = NULL;
static time_t last_mtime = 0;
mountlist m;
struct rmtabent *rep;
struct stat stb;
int lockid;
if ((lockid = xflock(_PATH_RMTAB, "r")) < 0)
return NULL;
if (stat(_PATH_RMTAB, &stb) < 0) {
xlog(L_ERROR, "can't stat %s", _PATH_RMTAB);
return NULL;
}
if (stb.st_mtime != last_mtime) {
while (mlist) {
mlist = (m = mlist)->ml_next;
xfree(m->ml_hostname);
xfree(m->ml_directory);
xfree(m);
}
last_mtime = stb.st_mtime;
setrmtabent("r");
while ((rep = getrmtabent(1, NULL)) != NULL) {
m = (mountlist) xmalloc(sizeof(*m));
m->ml_hostname = xstrdup(rep->r_client);
m->ml_directory = xstrdup(rep->r_path);
m->ml_next = mlist;
mlist = m;
}
endrmtabent();
}
xfunlock(lockid);
return mlist;
}
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