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/*
* Unix SMB/CIFS implementation.
* Wait for process death
* Copyright (C) Volker Lendecke 2016
*
* 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 "serverid.h"
#include "server_id_watch.h"
#include "lib/util/server_id.h"
#include "lib/util/tevent_unix.h"
#include "lib/util/util_file.h"
struct server_id_watch_state {
struct tevent_context *ev;
struct server_id pid;
struct timeval start;
struct timeval warn;
bool debug;
};
static void server_id_watch_waited(struct tevent_req *subreq);
struct tevent_req *server_id_watch_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct server_id pid)
{
struct tevent_req *req, *subreq;
struct server_id_watch_state *state;
struct timeval next;
req = tevent_req_create(mem_ctx, &state, struct server_id_watch_state);
if (req == NULL) {
return NULL;
}
state->ev = ev;
state->pid = pid;
state->start = tevent_timeval_current();
state->warn = tevent_timeval_add(&state->start, 10, 0);
state->debug = lp_parm_bool(GLOBAL_SECTION_SNUM,
"serverid watch",
"debug",
CHECK_DEBUGLVL(DBGLVL_DEBUG));
if (!serverid_exists(&state->pid)) {
tevent_req_done(req);
return tevent_req_post(req, ev);
}
next = tevent_timeval_add(&state->start, 0, 500000);
subreq = tevent_wakeup_send(state, ev, next);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, server_id_watch_waited, req);
return req;
}
static void server_id_watch_waited(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct server_id_watch_state *state = tevent_req_data(
req, struct server_id_watch_state);
struct timeval now;
struct timeval next;
bool ok;
ok = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
if (!ok) {
tevent_req_oom(req);
return;
}
if (!serverid_exists(&state->pid)) {
tevent_req_done(req);
return;
}
now = tevent_timeval_current();
if (!state->debug) {
goto next;
}
if (timeval_compare(&state->warn, &now) == -1) {
double duration = timeval_elapsed2(&state->start, &now);
const char *cmd = NULL;
char proc_path[64] = { 0, };
char *kstack = NULL;
struct server_id_buf buf;
const char *pid = server_id_str_buf(state->pid, &buf);
int ret;
state->warn = tevent_timeval_add(&now, 10, 0);
cmd = lp_parm_const_string(GLOBAL_SECTION_SNUM,
"serverid watch",
"debug script",
NULL);
if (cmd != NULL) {
char *cmdstr = NULL;
char *output = NULL;
int fd;
/*
* Note in a cluster setup pid will be
* a NOTE:PID like '1:3978365'
*
* Without clustering it is just '3978365'
*/
cmdstr = talloc_asprintf(state, "%s %s", cmd, pid);
if (cmdstr == NULL) {
DBG_ERR("Process %s hanging for %f seconds?\n"
"talloc_asprintf failed\n",
pid, duration);
goto next;
}
become_root();
ret = smbrun(cmdstr, &fd, NULL);
unbecome_root();
if (ret != 0) {
DBG_ERR("Process %s hanging for %f seconds?\n"
"smbrun('%s') failed\n",
pid, duration, cmdstr);
TALLOC_FREE(cmdstr);
goto next;
}
output = fd_load(fd, NULL, 0, state);
close(fd);
if (output == NULL) {
DBG_ERR("Process %s hanging for %f seconds?\n"
"fd_load() of smbrun('%s') failed\n",
pid, duration, cmdstr);
TALLOC_FREE(cmdstr);
goto next;
}
DBG_ERR("Process %s hanging for %f seconds?\n"
"%s returned:\n%s",
pid, duration, cmdstr, output);
TALLOC_FREE(cmdstr);
TALLOC_FREE(output);
goto next;
}
if (!procid_is_local(&state->pid) || !sys_have_proc_fds()) {
DBG_ERR("Process %s hanging for %f seconds?\n",
pid, duration);
goto next;
}
ret = snprintf(proc_path,
ARRAY_SIZE(proc_path),
"/proc/%" PRIu64 "/stack",
state->pid.pid);
if (ret < 0) {
DBG_ERR("Process %s hanging for %f seconds?\n"
"snprintf failed\n",
pid, duration);
goto next;
}
become_root();
kstack = file_load(proc_path, NULL, 0, state);
unbecome_root();
if (kstack == NULL) {
DBG_ERR("Process %s hanging for %f seconds?\n"
"file_load [%s] failed\n",
pid, duration, proc_path);
goto next;
}
DBG_ERR("Process %s hanging for %f seconds?\n"
"%s:\n%s",
pid, duration, proc_path, kstack);
TALLOC_FREE(kstack);
}
next:
next = tevent_timeval_add(&now, 0, 500000);
subreq = tevent_wakeup_send(state, state->ev, next);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, server_id_watch_waited, req);
}
int server_id_watch_recv(struct tevent_req *req, struct server_id *pid)
{
struct server_id_watch_state *state = tevent_req_data(
req, struct server_id_watch_state);
int err;
if (tevent_req_is_unix_error(req, &err)) {
return err;
}
if (pid) {
*pid = state->pid;
}
return 0;
}
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