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samba-mirror/ctdb/server/eventscript.c

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/*
event script handling
Copyright (C) Andrew Tridgell 2007
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 <time.h>
#include "system/filesys.h"
#include "system/wait.h"
#include "system/dir.h"
#include "system/locale.h"
#include "../include/ctdb_private.h"
#include "lib/events/events.h"
#include "../common/rb_tree.h"
static struct {
struct timeval start;
const char *script_running;
} child_state;
static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te, struct timeval t, void *p);
/*
ctdbd sends us a SIGTERM when we should time out the current script
*/
static void sigterm(int sig)
{
char tbuf[100], buf[200];
time_t t;
DEBUG(DEBUG_ERR,("Timed out running script '%s' after %.1f seconds pid :%d\n",
child_state.script_running, timeval_elapsed(&child_state.start), getpid()));
t = time(NULL);
strftime(tbuf, sizeof(tbuf)-1, "%Y%m%d%H%M%S", localtime(&t));
sprintf(buf, "pstree -p >/tmp/ctdb.event.%s.%d", tbuf, getpid());
system(buf);
DEBUG(DEBUG_ERR,("Logged timedout eventscript : %s\n", buf));
/* all the child processes will be running in the same process group */
kill(-getpgrp(), SIGKILL);
_exit(1);
}
struct ctdb_event_script_state {
struct ctdb_context *ctdb;
pid_t child;
/* Warning: this can free us! */
void (*callback)(struct ctdb_context *, int, void *);
int cb_status;
int fd[2];
void *private_data;
const char *options;
struct timeval timeout;
};
struct ctdb_monitor_script_status {
struct ctdb_monitor_script_status *next;
const char *name;
struct timeval start;
struct timeval finished;
int32_t disabled;
int32_t status;
int32_t timedout;
char *output;
};
struct ctdb_monitor_script_status_ctx {
struct ctdb_monitor_script_status *scripts;
};
/* called from ctdb_logging when we have received output on STDERR from
* one of the eventscripts
*/
int ctdb_log_event_script_output(struct ctdb_context *ctdb, char *str, uint16_t len)
{
struct ctdb_monitor_script_status *script;
if (ctdb->current_monitor_status_ctx == NULL) {
return -1;
}
script = ctdb->current_monitor_status_ctx->scripts;
if (script == NULL) {
return -1;
}
if (script->output == NULL) {
script->output = talloc_asprintf(script, "%*.*s", len, len, str);
} else {
script->output = talloc_asprintf_append(script->output, "%*.*s", len, len, str);
}
return 0;
}
/* called from the event script child process when we are starting a new
* monitor event
*/
int32_t ctdb_control_event_script_init(struct ctdb_context *ctdb)
{
DEBUG(DEBUG_INFO, ("event script init called\n"));
if (ctdb->current_monitor_status_ctx == NULL) {
DEBUG(DEBUG_ERR,(__location__ " current_monitor_status_ctx is NULL when initing script\n"));
return -1;
}
return 0;
}
/* called from the event script child process when we are star running
* an eventscript
*/
int32_t ctdb_control_event_script_start(struct ctdb_context *ctdb, TDB_DATA indata)
{
const char *name = (const char *)indata.dptr;
struct ctdb_monitor_script_status *script;
DEBUG(DEBUG_INFO, ("event script start called : %s\n", name));
if (ctdb->current_monitor_status_ctx == NULL) {
DEBUG(DEBUG_ERR,(__location__ " current_monitor_status_ctx is NULL when starting script\n"));
return -1;
}
script = talloc_zero(ctdb->current_monitor_status_ctx, struct ctdb_monitor_script_status);
if (script == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to talloc ctdb_monitor_script_status for script %s\n", name));
return -1;
}
script->next = ctdb->current_monitor_status_ctx->scripts;
script->name = talloc_strdup(script, name);
CTDB_NO_MEMORY(ctdb, script->name);
script->start = timeval_current();
ctdb->current_monitor_status_ctx->scripts = script;
return 0;
}
/* called from the event script child process when we have finished running
* an eventscript
*/
int32_t ctdb_control_event_script_stop(struct ctdb_context *ctdb, TDB_DATA indata)
{
int32_t res = *((int32_t *)indata.dptr);
struct ctdb_monitor_script_status *script;
if (ctdb->current_monitor_status_ctx == NULL) {
DEBUG(DEBUG_ERR,(__location__ " current_monitor_status_ctx is NULL when script finished\n"));
return -1;
}
script = ctdb->current_monitor_status_ctx->scripts;
if (script == NULL) {
DEBUG(DEBUG_ERR,(__location__ " script is NULL when the script had finished\n"));
return -1;
}
script->finished = timeval_current();
script->status = res;
DEBUG(DEBUG_INFO, ("event script stop called for script:%s duration:%.1f status:%d\n", script->name, timeval_elapsed(&script->start), (int)res));
return 0;
}
/* called from the event script child process when we have a disabled script
*/
int32_t ctdb_control_event_script_disabled(struct ctdb_context *ctdb, TDB_DATA indata)
{
const char *name = (const char *)indata.dptr;
struct ctdb_monitor_script_status *script;
DEBUG(DEBUG_INFO, ("event script disabed called for script %s\n", name));
if (ctdb->current_monitor_status_ctx == NULL) {
DEBUG(DEBUG_ERR,(__location__ " current_monitor_status_ctx is NULL when script finished\n"));
return -1;
}
script = ctdb->current_monitor_status_ctx->scripts;
if (script == NULL) {
DEBUG(DEBUG_ERR,(__location__ " script is NULL when the script had finished\n"));
return -1;
}
script->finished = timeval_current();
script->status = 0;
script->disabled = 1;
return 0;
}
/* called from the event script child process when we have completed a
* monitor event
*/
int32_t ctdb_control_event_script_finished(struct ctdb_context *ctdb)
{
DEBUG(DEBUG_INFO, ("event script finished called\n"));
if (ctdb->current_monitor_status_ctx == NULL) {
DEBUG(DEBUG_ERR,(__location__ " script_status is NULL when monitoring event finished\n"));
return -1;
}
if (ctdb->last_monitor_status_ctx) {
talloc_free(ctdb->last_monitor_status_ctx);
ctdb->last_monitor_status_ctx = NULL;
}
ctdb->last_monitor_status_ctx = talloc_steal(ctdb, ctdb->current_monitor_status_ctx);
ctdb->current_monitor_status_ctx = NULL;
return 0;
}
static struct ctdb_monitoring_wire *marshall_monitoring_scripts(TALLOC_CTX *mem_ctx, struct ctdb_monitoring_wire *monitoring_scripts, struct ctdb_monitor_script_status *script)
{
struct ctdb_monitoring_script_wire script_wire;
size_t size;
if (script == NULL) {
return monitoring_scripts;
}
monitoring_scripts = marshall_monitoring_scripts(mem_ctx, monitoring_scripts, script->next);
if (monitoring_scripts == NULL) {
return NULL;
}
bzero(&script_wire, sizeof(struct ctdb_monitoring_script_wire));
strncpy(script_wire.name, script->name, MAX_SCRIPT_NAME);
script_wire.start = script->start;
script_wire.finished = script->finished;
script_wire.disabled = script->disabled;
script_wire.status = script->status;
script_wire.timedout = script->timedout;
if (script->output != NULL) {
strncpy(script_wire.output, script->output, MAX_SCRIPT_OUTPUT);
}
size = talloc_get_size(monitoring_scripts);
monitoring_scripts = talloc_realloc_size(mem_ctx, monitoring_scripts, size + sizeof(struct ctdb_monitoring_script_wire));
if (monitoring_scripts == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to talloc_resize monitoring_scripts blob\n"));
return NULL;
}
memcpy(&monitoring_scripts->scripts[monitoring_scripts->num_scripts], &script_wire, sizeof(script_wire));
monitoring_scripts->num_scripts++;
return monitoring_scripts;
}
int32_t ctdb_control_get_event_script_status(struct ctdb_context *ctdb, TDB_DATA *outdata)
{
struct ctdb_monitor_script_status_ctx *script_status = talloc_get_type(ctdb->last_monitor_status_ctx, struct ctdb_monitor_script_status_ctx);
struct ctdb_monitoring_wire *monitoring_scripts;
if (script_status == NULL) {
DEBUG(DEBUG_ERR,(__location__ " last_monitor_status_ctx is NULL when reading status\n"));
return -1;
}
monitoring_scripts = talloc_size(outdata, offsetof(struct ctdb_monitoring_wire, scripts));
if (monitoring_scripts == NULL) {
DEBUG(DEBUG_ERR,(__location__ " failed to talloc monitoring_scripts structure\n"));
return -1;
}
monitoring_scripts->num_scripts = 0;
monitoring_scripts = marshall_monitoring_scripts(outdata, monitoring_scripts, script_status->scripts);
if (monitoring_scripts == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Monitoring scritps is NULL. can not return data to client\n"));
return -1;
}
outdata->dsize = talloc_get_size(monitoring_scripts);
outdata->dptr = (uint8_t *)monitoring_scripts;
return 0;
}
struct ctdb_script_tree_item {
const char *name;
int32_t is_enabled;
};
struct ctdb_script_list {
struct ctdb_script_list *next;
const char *name;
int32_t is_enabled;
};
static struct ctdb_script_list *ctdb_get_script_list(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx)
{
DIR *dir;
struct dirent *de;
struct stat st;
trbt_tree_t *tree;
struct ctdb_script_list *head, *tail, *new_item;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
struct ctdb_script_tree_item *tree_item;
int count;
/*
the service specific event scripts
*/
if (stat(ctdb->event_script_dir, &st) != 0 &&
errno == ENOENT) {
DEBUG(DEBUG_CRIT,("No event script directory found at '%s'\n", ctdb->event_script_dir));
talloc_free(tmp_ctx);
return NULL;
}
/* create a tree to store all the script names in */
tree = trbt_create(tmp_ctx, 0);
/* scan all directory entries and insert all valid scripts into the
tree
*/
dir = opendir(ctdb->event_script_dir);
if (dir == NULL) {
DEBUG(DEBUG_CRIT,("Failed to open event script directory '%s'\n", ctdb->event_script_dir));
talloc_free(tmp_ctx);
return NULL;
}
count = 0;
while ((de=readdir(dir)) != NULL) {
int namlen;
unsigned num;
char *str;
namlen = strlen(de->d_name);
if (namlen < 3) {
continue;
}
if (de->d_name[namlen-1] == '~') {
/* skip files emacs left behind */
continue;
}
if (de->d_name[2] != '.') {
continue;
}
if (sscanf(de->d_name, "%02u.", &num) != 1) {
continue;
}
/* Make sure the event script is executable */
str = talloc_asprintf(tree, "%s/%s", ctdb->event_script_dir, de->d_name);
if (stat(str, &st) != 0) {
DEBUG(DEBUG_ERR,("Could not stat event script %s. Ignoring this event script\n", str));
continue;
}
tree_item = talloc(tree, struct ctdb_script_tree_item);
if (tree_item == NULL) {
DEBUG(DEBUG_ERR, (__location__ " Failed to allocate new tree item\n"));
talloc_free(tmp_ctx);
return NULL;
}
tree_item->is_enabled = 1;
if (!(st.st_mode & S_IXUSR)) {
DEBUG(DEBUG_INFO,("Event script %s is not executable. Ignoring this event script\n", str));
tree_item->is_enabled = 0;
}
tree_item->name = talloc_strdup(tree_item, de->d_name);
if (tree_item->name == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to allocate script name.\n"));
talloc_free(tmp_ctx);
return NULL;
}
/* store the event script in the tree */
trbt_insert32(tree, (num<<16)|count++, tree_item);
}
closedir(dir);
head = NULL;
tail = NULL;
/* fetch the scripts from the tree one by one and add them to the linked
list
*/
while ((tree_item=trbt_findfirstarray32(tree, 1)) != NULL) {
new_item = talloc(tmp_ctx, struct ctdb_script_list);
if (new_item == NULL) {
DEBUG(DEBUG_ERR, (__location__ " Failed to allocate new list item\n"));
talloc_free(tmp_ctx);
return NULL;
}
new_item->next = NULL;
new_item->name = talloc_steal(new_item, tree_item->name);
new_item->is_enabled = tree_item->is_enabled;
if (head == NULL) {
head = new_item;
tail = new_item;
} else {
tail->next = new_item;
tail = new_item;
}
talloc_steal(mem_ctx, new_item);
/* remove this script from the tree */
talloc_free(tree_item);
}
talloc_free(tmp_ctx);
return head;
}
/*
Actually run the event script
this function is called and run in the context of a forked child
which allows it to do blocking calls such as system()
*/
static int ctdb_run_event_script(struct ctdb_context *ctdb, const char *options)
{
char *cmdstr;
int ret;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
struct ctdb_script_list *scripts, *current;
int is_monitor = 0;
if (!strcmp(options, "monitor")) {
is_monitor = 1;
}
if (is_monitor == 1) {
/* This is running in the forked child process. At this stage
* we want to switch from being a ctdb daemon into being a
* client and connect to the real local daemon.
*/
if (switch_from_server_to_client(ctdb) != 0) {
DEBUG(DEBUG_CRIT, (__location__ "ERROR: failed to switch eventscript child into client mode. shutting down.\n"));
_exit(1);
}
if (ctdb_ctrl_event_script_init(ctdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to init event script monitoring\n"));
talloc_free(tmp_ctx);
return -1;
}
}
if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
/* we guarantee that only some specifically allowed event scripts are run
while in recovery */
const char *allowed_scripts[] = {"startrecovery", "shutdown", "releaseip", "stopped" };
int i;
for (i=0;i<ARRAY_SIZE(allowed_scripts);i++) {
if (strncmp(options, allowed_scripts[i], strlen(allowed_scripts[i])) == 0) break;
}
if (i == ARRAY_SIZE(allowed_scripts)) {
DEBUG(DEBUG_ERR,("Refusing to run event scripts with option '%s' while in recovery\n",
options));
talloc_free(tmp_ctx);
return -1;
}
}
if (setpgid(0,0) != 0) {
DEBUG(DEBUG_ERR,("Failed to create process group for event scripts - %s\n",
strerror(errno)));
talloc_free(tmp_ctx);
return -1;
}
signal(SIGTERM, sigterm);
child_state.start = timeval_current();
child_state.script_running = "startup";
scripts = ctdb_get_script_list(ctdb, tmp_ctx);
/* fetch the scripts from the tree one by one and execute
them
*/
for (current=scripts; current; current=current->next) {
/* Allow a setting where we run the actual monitor event
from an external source and replace it with
a "status" event that just picks up the actual
status of the event asynchronously.
*/
if ((ctdb->tunable.use_status_events_for_monitoring != 0)
&& (!strcmp(options, "monitor"))) {
cmdstr = talloc_asprintf(tmp_ctx, "%s/%s %s",
ctdb->event_script_dir,
current->name, "status");
} else {
cmdstr = talloc_asprintf(tmp_ctx, "%s/%s %s",
ctdb->event_script_dir,
current->name, options);
}
CTDB_NO_MEMORY(ctdb, cmdstr);
DEBUG(DEBUG_INFO,("Executing event script %s\n",cmdstr));
child_state.start = timeval_current();
child_state.script_running = cmdstr;
if (is_monitor == 1) {
if (ctdb_ctrl_event_script_start(ctdb, current->name) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to start event script monitoring\n"));
talloc_free(tmp_ctx);
return -1;
}
if (!current->is_enabled) {
if (ctdb_ctrl_event_script_disabled(ctdb, current->name) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to report disabled eventscript\n"));
talloc_free(tmp_ctx);
return -1;
}
}
}
if (!current->is_enabled) {
continue;
}
ret = system(cmdstr);
/* if the system() call was successful, translate ret into the
return code from the command
*/
if (ret != -1) {
ret = WEXITSTATUS(ret);
}
if (ret == 127) {
ret = 0;
DEBUG(DEBUG_ERR,("Script %s returned status 127. Someone just deleted it?\n", cmdstr));
}
if (is_monitor == 1) {
if (ctdb_ctrl_event_script_stop(ctdb, ret) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to stop event script monitoring\n"));
talloc_free(tmp_ctx);
return -1;
}
}
/* return an error if the script failed */
if (ret != 0) {
DEBUG(DEBUG_ERR,("Event script %s failed with error %d\n", cmdstr, ret));
if (is_monitor == 1) {
if (ctdb_ctrl_event_script_finished(ctdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to finish event script monitoring\n"));
talloc_free(tmp_ctx);
return -1;
}
}
talloc_free(tmp_ctx);
return ret;
}
}
child_state.start = timeval_current();
child_state.script_running = "finished";
if (is_monitor == 1) {
if (ctdb_ctrl_event_script_finished(ctdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to finish event script monitoring\n"));
talloc_free(tmp_ctx);
return -1;
}
}
talloc_free(tmp_ctx);
return 0;
}
/* called when child is finished */
static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
uint16_t flags, void *p)
{
struct ctdb_event_script_state *state =
talloc_get_type(p, struct ctdb_event_script_state);
struct ctdb_context *ctdb = state->ctdb;
if (read(state->fd[0], &state->cb_status, sizeof(state->cb_status)) !=
sizeof(state->cb_status)) {
state->cb_status = -2;
}
DEBUG(DEBUG_INFO,(__location__ " Eventscript %s finished with state %d\n", state->options, state->cb_status));
state->child = 0;
ctdb->event_script_timeouts = 0;
talloc_free(state);
}
static void ctdb_ban_self(struct ctdb_context *ctdb, uint32_t ban_period)
{
TDB_DATA data;
struct ctdb_ban_time bantime;
bantime.pnn = ctdb->pnn;
bantime.time = ban_period;
data.dsize = sizeof(bantime);
data.dptr = (uint8_t *)&bantime;
ctdb_control_set_ban_state(ctdb, data);
}
/* called when child times out */
static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te,
struct timeval t, void *p)
{
struct ctdb_event_script_state *state = talloc_get_type(p, struct ctdb_event_script_state);
struct ctdb_context *ctdb = state->ctdb;
DEBUG(DEBUG_ERR,("Event script timed out : %s count : %u pid : %d\n", state->options, ctdb->event_script_timeouts, state->child));
if (kill(state->child, 0) != 0) {
DEBUG(DEBUG_ERR,("Event script child process already dead, errno %s(%d)\n", strerror(errno), errno));
state->child = 0;
talloc_free(state);
return;
}
if (!strcmp(state->options, "monitor")) {
/* if it is a monitor event, we allow it to "hang" a few times
before we declare it a failure and ban ourself (and make
ourself unhealthy)
*/
DEBUG(DEBUG_ERR, (__location__ " eventscript for monitor event timedout.\n"));
ctdb->event_script_timeouts++;
if (ctdb->event_script_timeouts > ctdb->tunable.script_ban_count) {
DEBUG(DEBUG_ERR, ("Maximum timeout count %u reached for eventscript. Making node unhealthy\n", ctdb->tunable.script_ban_count));
state->cb_status = -ETIME;
} else {
state->cb_status = 0;
}
} else if (!strcmp(state->options, "startup")) {
DEBUG(DEBUG_ERR, (__location__ " eventscript for startup event timedout.\n"));
state->cb_status = -1;
} else {
/* if it is not a monitor or a startup event we ban ourself
immediately
*/
DEBUG(DEBUG_ERR, (__location__ " eventscript for NON-monitor/NON-startup event timedout. Immediately banning ourself for %d seconds\n", ctdb->tunable.recovery_ban_period));
ctdb_ban_self(ctdb, ctdb->tunable.recovery_ban_period);
state->cb_status = -1;
}
if (!strcmp(state->options, "monitor") || !strcmp(state->options, "status")) {
struct ctdb_monitor_script_status *script;
if (ctdb->current_monitor_status_ctx == NULL) {
talloc_free(state);
return;
}
script = ctdb->current_monitor_status_ctx->scripts;
if (script != NULL) {
script->timedout = 1;
}
if (ctdb->last_monitor_status_ctx) {
talloc_free(ctdb->last_monitor_status_ctx);
ctdb->last_monitor_status_ctx = NULL;
}
ctdb->last_monitor_status_ctx = talloc_steal(ctdb, ctdb->current_monitor_status_ctx);
ctdb->current_monitor_status_ctx = NULL;
}
talloc_free(state);
}
/*
destroy an event script: kill it if ->child != 0.
*/
static int event_script_destructor(struct ctdb_event_script_state *state)
{
if (state->child) {
DEBUG(DEBUG_ERR,(__location__ " Sending SIGTERM to child pid:%d\n", state->child));
if (kill(state->child, SIGTERM) != 0) {
DEBUG(DEBUG_ERR,("Failed to kill child process for eventscript, errno %s(%d)\n", strerror(errno), errno));
}
}
/* This is allowed to free us; talloc will prevent double free anyway,
* but beware if you call this outside the destructor! */
if (state->callback) {
state->callback(state->ctdb, state->cb_status, state->private_data);
}
return 0;
}
/*
run the event script in the background, calling the callback when
finished
*/
static int ctdb_event_script_callback_v(struct ctdb_context *ctdb,
void (*callback)(struct ctdb_context *, int, void *),
void *private_data,
const char *fmt, va_list ap)
{
TALLOC_CTX *mem_ctx;
struct ctdb_event_script_state *state;
int ret;
if (!strcmp(fmt, "monitor") || !strcmp(fmt, "status")) {
/* if this was a "monitor" or a status event, we recycle the
context to start a new monitor event
*/
if (ctdb->monitor_event_script_ctx != NULL) {
talloc_free(ctdb->monitor_event_script_ctx);
ctdb->monitor_event_script_ctx = NULL;
}
ctdb->monitor_event_script_ctx = talloc_new(ctdb);
mem_ctx = ctdb->monitor_event_script_ctx;
if (ctdb->current_monitor_status_ctx != NULL) {
talloc_free(ctdb->current_monitor_status_ctx);
ctdb->current_monitor_status_ctx = NULL;
}
ctdb->current_monitor_status_ctx = talloc(ctdb->monitor_event_script_ctx, struct ctdb_monitor_script_status_ctx);
ctdb->current_monitor_status_ctx->scripts = NULL;
} else {
/* any other script will first terminate any monitor event */
if (ctdb->monitor_event_script_ctx != NULL) {
talloc_free(ctdb->monitor_event_script_ctx);
ctdb->monitor_event_script_ctx = NULL;
}
/* and then use a context common for all non-monitor events */
if (ctdb->other_event_script_ctx != NULL) {
talloc_free(ctdb->other_event_script_ctx);
ctdb->other_event_script_ctx = NULL;
}
ctdb->other_event_script_ctx = talloc_new(ctdb);
mem_ctx = ctdb->other_event_script_ctx;
}
state = talloc(mem_ctx, struct ctdb_event_script_state);
CTDB_NO_MEMORY(ctdb, state);
state->ctdb = ctdb;
state->callback = callback;
state->private_data = private_data;
state->options = talloc_vasprintf(state, fmt, ap);
state->timeout = timeval_set(ctdb->tunable.script_timeout, 0);
if (state->options == NULL) {
DEBUG(DEBUG_ERR, (__location__ " could not allocate state->options\n"));
talloc_free(state);
return -1;
}
DEBUG(DEBUG_INFO,(__location__ " Starting eventscript %s\n", state->options));
ret = pipe(state->fd);
if (ret != 0) {
talloc_free(state);
return -1;
}
state->child = fork();
if (state->child == (pid_t)-1) {
close(state->fd[0]);
close(state->fd[1]);
talloc_free(state);
return -1;
}
if (state->child == 0) {
int rt;
close(state->fd[0]);
set_close_on_exec(state->fd[1]);
rt = ctdb_run_event_script(ctdb, state->options);
/* We must be able to write PIPEBUF bytes at least; if this
somehow fails, the read above will be short. */
write(state->fd[1], &rt, sizeof(rt));
close(state->fd[1]);
_exit(rt);
}
close(state->fd[1]);
set_close_on_exec(state->fd[0]);
talloc_set_destructor(state, event_script_destructor);
DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d to child eventscript process\n", state->fd[0]));
event_add_fd(ctdb->ev, state, state->fd[0], EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
ctdb_event_script_handler, state);
if (!timeval_is_zero(&state->timeout)) {
event_add_timed(ctdb->ev, state, timeval_current_ofs(state->timeout.tv_sec, state->timeout.tv_usec), ctdb_event_script_timeout, state);
} else {
DEBUG(DEBUG_ERR, (__location__ " eventscript %s called with no timeout\n", state->options));
}
return 0;
}
/*
run the event script in the background, calling the callback when
finished
*/
int ctdb_event_script_callback(struct ctdb_context *ctdb,
TALLOC_CTX *mem_ctx,
void (*callback)(struct ctdb_context *, int, void *),
void *private_data,
const char *fmt, ...)
{
va_list ap;
int ret;
va_start(ap, fmt);
ret = ctdb_event_script_callback_v(ctdb, callback, private_data, fmt, ap);
va_end(ap);
return ret;
}
struct callback_status {
bool done;
int status;
};
/*
called when ctdb_event_script() finishes
*/
static void event_script_callback(struct ctdb_context *ctdb, int status, void *private_data)
{
struct callback_status *s = (struct callback_status *)private_data;
s->done = true;
s->status = status;
}
/*
run the event script, waiting for it to complete. Used when the caller
doesn't want to continue till the event script has finished.
*/
int ctdb_event_script(struct ctdb_context *ctdb, const char *fmt, ...)
{
va_list ap;
int ret;
struct callback_status status;
va_start(ap, fmt);
ret = ctdb_event_script_callback_v(ctdb,
event_script_callback, &status, fmt, ap);
va_end(ap);
if (ret != 0) {
return ret;
}
status.status = -1;
status.done = false;
while (status.done == false && event_loop_once(ctdb->ev) == 0) /* noop */;
return status.status;
}
struct eventscript_callback_state {
struct ctdb_req_control *c;
};
/*
called when a forced eventscript finishes
*/
static void run_eventscripts_callback(struct ctdb_context *ctdb, int status,
void *private_data)
{
struct eventscript_callback_state *state =
talloc_get_type(private_data, struct eventscript_callback_state);
ctdb_enable_monitoring(ctdb);
if (status != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to forcibly run eventscripts\n"));
}
ctdb_request_control_reply(ctdb, state->c, NULL, status, NULL);
/* This will free the struct ctdb_event_script_state we are in! */
talloc_free(state);
return;
}
/*
A control to force running of the eventscripts from the ctdb client tool
*/
int32_t ctdb_run_eventscripts(struct ctdb_context *ctdb,
struct ctdb_req_control *c,
TDB_DATA indata, bool *async_reply)
{
int ret;
struct eventscript_callback_state *state;
if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
DEBUG(DEBUG_ERR, (__location__ " Aborted running eventscript \"%s\" while in RECOVERY mode\n", indata.dptr));
return -1;
}
state = talloc(ctdb->other_event_script_ctx, struct eventscript_callback_state);
CTDB_NO_MEMORY(ctdb, state);
state->c = talloc_steal(state, c);
DEBUG(DEBUG_NOTICE,("Forced running of eventscripts with arguments %s\n", indata.dptr));
ctdb_disable_monitoring(ctdb);
ret = ctdb_event_script_callback(ctdb,
state, run_eventscripts_callback, state,
"%s", (const char *)indata.dptr);
if (ret != 0) {
ctdb_enable_monitoring(ctdb);
DEBUG(DEBUG_ERR,(__location__ " Failed to run eventscripts with arguments %s\n", indata.dptr));
talloc_free(state);
return -1;
}
/* tell ctdb_control.c that we will be replying asynchronously */
*async_reply = true;
return 0;
}
int32_t ctdb_control_enable_script(struct ctdb_context *ctdb, TDB_DATA indata)
{
const char *script;
struct stat st;
char *filename;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
script = (char *)indata.dptr;
if (indata.dsize == 0) {
DEBUG(DEBUG_ERR,(__location__ " No script specified.\n"));
talloc_free(tmp_ctx);
return -1;
}
if (indata.dptr[indata.dsize - 1] != '\0') {
DEBUG(DEBUG_ERR,(__location__ " String is not null terminated.\n"));
talloc_free(tmp_ctx);
return -1;
}
if (index(script,'/') != NULL) {
DEBUG(DEBUG_ERR,(__location__ " Script name contains '/'. Failed to enable script %s\n", script));
talloc_free(tmp_ctx);
return -1;
}
if (stat(ctdb->event_script_dir, &st) != 0 &&
errno == ENOENT) {
DEBUG(DEBUG_CRIT,("No event script directory found at '%s'\n", ctdb->event_script_dir));
talloc_free(tmp_ctx);
return -1;
}
filename = talloc_asprintf(tmp_ctx, "%s/%s", ctdb->event_script_dir, script);
if (filename == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to create script path\n"));
talloc_free(tmp_ctx);
return -1;
}
if (stat(filename, &st) != 0) {
DEBUG(DEBUG_ERR,("Could not stat event script %s. Failed to enable script.\n", filename));
talloc_free(tmp_ctx);
return -1;
}
if (chmod(filename, st.st_mode | S_IXUSR) == -1) {
DEBUG(DEBUG_ERR,("Could not chmod %s. Failed to enable script.\n", filename));
talloc_free(tmp_ctx);
return -1;
}
talloc_free(tmp_ctx);
return 0;
}
int32_t ctdb_control_disable_script(struct ctdb_context *ctdb, TDB_DATA indata)
{
const char *script;
struct stat st;
char *filename;
TALLOC_CTX *tmp_ctx = talloc_new(ctdb);
script = (char *)indata.dptr;
if (indata.dsize == 0) {
DEBUG(DEBUG_ERR,(__location__ " No script specified.\n"));
talloc_free(tmp_ctx);
return -1;
}
if (indata.dptr[indata.dsize - 1] != '\0') {
DEBUG(DEBUG_ERR,(__location__ " String is not null terminated.\n"));
talloc_free(tmp_ctx);
return -1;
}
if (index(script,'/') != NULL) {
DEBUG(DEBUG_ERR,(__location__ " Script name contains '/'. Failed to disable script %s\n", script));
talloc_free(tmp_ctx);
return -1;
}
if (stat(ctdb->event_script_dir, &st) != 0 &&
errno == ENOENT) {
DEBUG(DEBUG_CRIT,("No event script directory found at '%s'\n", ctdb->event_script_dir));
talloc_free(tmp_ctx);
return -1;
}
filename = talloc_asprintf(tmp_ctx, "%s/%s", ctdb->event_script_dir, script);
if (filename == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to create script path\n"));
talloc_free(tmp_ctx);
return -1;
}
if (stat(filename, &st) != 0) {
DEBUG(DEBUG_ERR,("Could not stat event script %s. Failed to disable script.\n", filename));
talloc_free(tmp_ctx);
return -1;
}
if (chmod(filename, st.st_mode & ~(S_IXUSR|S_IXGRP|S_IXOTH)) == -1) {
DEBUG(DEBUG_ERR,("Could not chmod %s. Failed to disable script.\n", filename));
talloc_free(tmp_ctx);
return -1;
}
talloc_free(tmp_ctx);
return 0;
}