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/*
* Samba Unix/Linux SMB client library
* Interface to the g_lock facility
* Copyright (C) Volker Lendecke 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "net.h"
#include "lib/util/server_id.h"
#include "g_lock.h"
#include "messages.h"
#include "lib/util/util_tdb.h"
static bool net_g_lock_init(TALLOC_CTX *mem_ctx,
struct tevent_context **pev,
struct messaging_context **pmsg,
struct g_lock_ctx **pg_ctx)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
ev = samba_tevent_context_init(mem_ctx);
if (ev == NULL) {
d_fprintf(stderr, "ERROR: could not init event context\n");
goto fail;
}
msg = messaging_init(mem_ctx, ev);
if (msg == NULL) {
d_fprintf(stderr, "ERROR: could not init messaging context\n");
goto fail;
}
g_ctx = g_lock_ctx_init(mem_ctx, msg);
if (g_ctx == NULL) {
d_fprintf(stderr, "ERROR: could not init g_lock context\n");
goto fail;
}
*pev = ev;
*pmsg = msg;
*pg_ctx = g_ctx;
return true;
fail:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return false;
}
static int net_g_lock_do(struct net_context *c, int argc, const char **argv)
{
struct g_lock_ctx *ctx = NULL;
TDB_DATA key = {0};
const char *cmd = NULL;
int timeout;
NTSTATUS status;
int result = -1;
if (argc != 3) {
d_printf("Usage: net g_lock do <lockname> <timeout> "
"<command>\n");
return -1;
}
key = string_term_tdb_data(argv[0]);
timeout = atoi(argv[1]);
cmd = argv[2];
ctx = g_lock_ctx_init(c, c->msg_ctx);
if (ctx == NULL) {
d_fprintf(stderr, _("g_lock_ctx_init failed\n"));
return -1;
}
status = g_lock_lock(
ctx,
key,
G_LOCK_WRITE,
timeval_set(timeout / 1000, timeout % 1000));
if (!NT_STATUS_IS_OK(status)) {
d_fprintf(stderr,
_("g_lock_lock failed: %s\n"),
nt_errstr(status));
goto done;
}
result = system(cmd);
g_lock_unlock(ctx, key);
if (result == -1) {
d_fprintf(stderr, "ERROR: system() returned %s\n",
strerror(errno));
goto done;
}
d_fprintf(stderr, "command returned %d\n", result);
done:
TALLOC_FREE(ctx);
return result;
}
static void net_g_lock_dump_fn(const struct g_lock_rec *locks,
size_t num_locks,
const uint8_t *data,
size_t datalen,
void *private_data)
{
size_t i;
for (i=0; i<num_locks; i++) {
const struct g_lock_rec *l = &locks[i];
struct server_id_buf idbuf;
d_printf("%s: %s\n", server_id_str_buf(l->pid, &idbuf),
(l->lock_type & 1) ? "WRITE" : "READ");
}
dump_data_file(data, datalen, true, stdout);
}
static int net_g_lock_dump(struct net_context *c, int argc, const char **argv)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
int ret = -1;
if (argc != 1) {
d_printf("Usage: net g_lock dump <lockname>\n");
return -1;
}
if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
goto done;
}
(void)g_lock_dump(g_ctx, string_term_tdb_data(argv[0]),
net_g_lock_dump_fn, NULL);
ret = 0;
done:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return ret;
}
static int net_g_lock_locks_fn(TDB_DATA key, void *private_data)
{
if ((key.dsize == 0) || (key.dptr[key.dsize-1] != 0)) {
DEBUG(1, ("invalid key in g_lock.tdb, ignoring\n"));
return 0;
}
d_printf("%s\n", (const char *)key.dptr);
return 0;
}
static int net_g_lock_locks(struct net_context *c, int argc, const char **argv)
{
struct tevent_context *ev = NULL;
struct messaging_context *msg = NULL;
struct g_lock_ctx *g_ctx = NULL;
int ret = -1;
if (argc != 0) {
d_printf("Usage: net g_lock locks\n");
return -1;
}
if (!net_g_lock_init(talloc_tos(), &ev, &msg, &g_ctx)) {
goto done;
}
ret = g_lock_locks(g_ctx, net_g_lock_locks_fn, NULL);
done:
TALLOC_FREE(g_ctx);
TALLOC_FREE(msg);
TALLOC_FREE(ev);
return ret < 0 ? -1 : ret;
}
int net_g_lock(struct net_context *c, int argc, const char **argv)
{
struct functable func[] = {
{
"do",
net_g_lock_do,
NET_TRANSPORT_LOCAL,
N_("Execute a shell command under a lock"),
N_("net g_lock do <lock name> <timeout> <command>\n")
},
{
"locks",
net_g_lock_locks,
NET_TRANSPORT_LOCAL,
N_("List all locknames"),
N_("net g_lock locks\n")
},
{
"dump",
net_g_lock_dump,
NET_TRANSPORT_LOCAL,
N_("Dump a g_lock locking table"),
N_("net g_lock dump <lock name>\n")
},
{NULL, NULL, 0, NULL, NULL}
};
return net_run_function(c, argc, argv, "net g_lock", func);
}
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