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/*
* Copyright (C) 2009 Red Hat <nfs@redhat.com>
*
* support/export/v4root.c
*
* Routines used to support NFSv4 pseudo roots
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include "xlog.h"
#include "exportfs.h"
#include "nfslib.h"
#include "misc.h"
#include "v4root.h"
int v4root_needed;
static nfs_export pseudo_root = {
.m_next = NULL,
.m_client = NULL,
.m_export = {
.e_hostname = "*",
.e_path = "/",
.e_flags = NFSEXP_READONLY | NFSEXP_ROOTSQUASH
| NFSEXP_NOSUBTREECHECK | NFSEXP_FSID
| NFSEXP_V4ROOT,
.e_anonuid = 65534,
.e_anongid = 65534,
.e_squids = NULL,
.e_nsquids = 0,
.e_sqgids = NULL,
.e_nsqgids = 0,
.e_fsid = 0,
.e_mountpoint = NULL,
.e_ttl = DEFAULT_TTL,
},
.m_exported = 0,
.m_xtabent = 1,
.m_mayexport = 1,
.m_changed = 0,
.m_warned = 0,
};
void set_pseudofs_security(struct exportent *pseudo, struct exportent *source)
{
struct sec_entry *se;
int i;
if (source->e_flags & NFSEXP_INSECURE_PORT)
pseudo->e_flags |= NFSEXP_INSECURE_PORT;
if ((source->e_flags & NFSEXP_ROOTSQUASH) == 0)
pseudo->e_flags &= ~NFSEXP_ROOTSQUASH;
for (se = source->e_secinfo; se->flav; se++) {
struct sec_entry *new;
i = secinfo_addflavor(se->flav, pseudo);
new = &pseudo->e_secinfo[i];
if (se->flags & NFSEXP_INSECURE_PORT)
new->flags |= NFSEXP_INSECURE_PORT;
}
}
/*
* Create a pseudo export
*/
static struct exportent *
v4root_create(char *path, nfs_export *export)
{
nfs_export *exp;
struct exportent eep;
struct exportent *curexp = &export->m_export;
dupexportent(&eep, &pseudo_root.m_export);
eep.e_hostname = curexp->e_hostname;
strncpy(eep.e_path, path, sizeof(eep.e_path));
if (strcmp(path, "/") != 0)
eep.e_flags &= ~NFSEXP_FSID;
set_pseudofs_security(&eep, curexp);
exp = export_create(&eep, 0);
if (exp == NULL)
return NULL;
xlog(D_CALL, "v4root_create: path '%s' flags 0x%x",
exp->m_export.e_path, exp->m_export.e_flags);
return &exp->m_export;
}
/*
* Make sure the kernel has pseudo root support.
*/
static int
v4root_support(void)
{
struct export_features *ef;
static int warned = 0;
ef = get_export_features();
if (ef->flags & NFSEXP_V4ROOT)
return 1;
if (!warned) {
xlog(L_WARNING, "Kernel does not have pseudo root support.");
xlog(L_WARNING, "NFS v4 mounts will be disabled unless fsid=0");
xlog(L_WARNING, "is specfied in /etc/exports file.");
warned++;
}
return 0;
}
int pseudofs_update(char *hostname, char *path, nfs_export *source)
{
nfs_export *exp;
exp = export_lookup(hostname, path, 0);
if (exp && !(exp->m_export.e_flags & NFSEXP_V4ROOT))
return 0;
if (!exp) {
if (v4root_create(path, source) == NULL) {
xlog(L_WARNING, "v4root_set: Unable to create "
"pseudo export for '%s'", path);
return -ENOMEM;
}
return 0;
}
/* Update an existing V4ROOT export: */
set_pseudofs_security(&exp->m_export, &source->m_export);
return 0;
}
static int v4root_add_parents(nfs_export *exp)
{
char *hostname = exp->m_export.e_hostname;
char *path;
char *ptr;
path = strdup(exp->m_export.e_path);
if (!path) {
xlog(L_WARNING, "v4root_add_parents: Unable to create "
"pseudo export for '%s'", exp->m_export.e_path);
return -ENOMEM;
}
for (ptr = path; ptr; ptr = strchr(ptr, '/')) {
int ret;
char saved;
saved = *ptr;
*ptr = '\0';
ret = pseudofs_update(hostname, *path ? path : "/", exp);
if (ret)
return ret;
*ptr = saved;
ptr++;
}
free(path);
return 0;
}
/*
* Create pseudo exports by running through the real export
* looking at the components of the path that make up the export.
* Those path components, if not exported, will become pseudo
* exports allowing them to be found when the kernel does an upcall
* looking for components of the v4 mount.
*/
void
v4root_set()
{
nfs_export *exp;
int i;
if (!v4root_needed)
return;
if (!v4root_support())
return;
for (i = 0; i < MCL_MAXTYPES; i++) {
for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
if (exp->m_export.e_flags & NFSEXP_V4ROOT)
/*
* We just added this one, so its
* parents are already dealt with!
*/
continue;
if (strcmp(exp->m_export.e_path, "/") == 0 &&
!(exp->m_export.e_flags & NFSEXP_FSID)) {
/* Force '/' to be exported as fsid == 0*/
exp->m_export.e_flags |= NFSEXP_FSID;
exp->m_export.e_fsid = 0;
}
v4root_add_parents(exp);
/* XXX: error handling! */
}
}
}
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