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d171d2010a
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Michael Adam <obnox@samba.org> Autobuild-User(master): Michael Adam <obnox@samba.org> Autobuild-Date(master): Fri Mar 13 19:14:20 CET 2015 on sn-devel-104
1107 lines
29 KiB
C
1107 lines
29 KiB
C
/*
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event script handling
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Copyright (C) Andrew Tridgell 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include <time.h>
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#include "system/filesys.h"
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#include "system/wait.h"
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#include "system/dir.h"
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#include "system/locale.h"
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#include "../include/ctdb_private.h"
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#include "../common/rb_tree.h"
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#include "lib/util/dlinklist.h"
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static void ctdb_event_script_timeout(struct event_context *ev, struct timed_event *te, struct timeval t, void *p);
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/* This is attached to the event script state. */
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struct event_script_callback {
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struct event_script_callback *next, *prev;
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struct ctdb_context *ctdb;
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/* Warning: this can free us! */
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void (*fn)(struct ctdb_context *, int, void *);
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void *private_data;
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};
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struct ctdb_event_script_state {
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struct ctdb_context *ctdb;
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struct event_script_callback *callback;
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pid_t child;
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int fd[2];
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enum ctdb_eventscript_call call;
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const char *options;
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struct timeval timeout;
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unsigned int current;
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struct ctdb_scripts_wire *scripts;
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};
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static struct ctdb_script_wire *get_current_script(struct ctdb_event_script_state *state)
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{
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return &state->scripts->scripts[state->current];
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}
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/* called from ctdb_logging when we have received output on STDERR from
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* one of the eventscripts
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*/
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static void log_event_script_output(const char *str, uint16_t len, void *p)
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{
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struct ctdb_event_script_state *state
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= talloc_get_type(p, struct ctdb_event_script_state);
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struct ctdb_script_wire *current;
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unsigned int slen, min;
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/* We may have been aborted to run something else. Discard */
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if (state->scripts == NULL) {
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return;
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}
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current = get_current_script(state);
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/* Append, but don't overfill buffer. It starts zero-filled. */
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slen = strlen(current->output);
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min = MIN(len, sizeof(current->output) - slen - 1);
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memcpy(current->output + slen, str, min);
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}
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int32_t ctdb_control_get_event_script_status(struct ctdb_context *ctdb,
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uint32_t call_type,
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TDB_DATA *outdata)
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{
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if (call_type >= CTDB_EVENT_MAX) {
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return -1;
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}
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if (ctdb->last_status[call_type] == NULL) {
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/* If it's never been run, return nothing so they can tell. */
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outdata->dsize = 0;
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} else {
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outdata->dsize = talloc_get_size(ctdb->last_status[call_type]);
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outdata->dptr = (uint8_t *)ctdb->last_status[call_type];
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}
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return 0;
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}
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/* To ignore directory entry return 0, else return non-zero */
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static int script_filter(const struct dirent *de)
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{
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int namelen = strlen(de->d_name);
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/* Ignore . and .. */
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if (namelen < 3) {
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return 0;
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}
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/* Skip temporary files left behind by emacs */
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if (de->d_name[namelen-1] == '~') {
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return 0;
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}
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/* Filename should start with [0-9][0-9]. */
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if (!isdigit(de->d_name[0]) || !isdigit(de->d_name[1]) ||
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de->d_name[2] != '.') {
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return 0;
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}
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if (namelen > MAX_SCRIPT_NAME) {
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return 0;
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}
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return 1;
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}
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/* Return true if OK, otherwise set errno. */
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static bool check_executable(const char *dir, const char *name)
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{
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char *full;
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struct stat st;
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full = talloc_asprintf(NULL, "%s/%s", dir, name);
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if (!full)
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return false;
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if (stat(full, &st) != 0) {
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DEBUG(DEBUG_ERR,("Could not stat event script %s: %s\n",
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full, strerror(errno)));
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talloc_free(full);
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return false;
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}
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if (!(st.st_mode & S_IXUSR)) {
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DEBUG(DEBUG_DEBUG,("Event script %s is not executable. Ignoring this event script\n", full));
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errno = ENOEXEC;
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talloc_free(full);
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return false;
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}
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talloc_free(full);
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return true;
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}
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static struct ctdb_scripts_wire *ctdb_get_script_list(struct ctdb_context *ctdb, TALLOC_CTX *mem_ctx)
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{
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struct dirent **namelist;
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struct ctdb_scripts_wire *scripts;
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int i, count;
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/* scan all directory entries and insert all valid scripts into the
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tree
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*/
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count = scandir(ctdb->event_script_dir, &namelist, script_filter, alphasort);
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if (count == -1) {
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DEBUG(DEBUG_CRIT, ("Failed to read event script directory '%s' - %s\n",
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ctdb->event_script_dir, strerror(errno)));
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return NULL;
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}
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/* Overallocates by one, but that's OK */
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scripts = talloc_zero_size(mem_ctx,
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sizeof(*scripts)
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+ sizeof(scripts->scripts[0]) * count);
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if (scripts == NULL) {
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DEBUG(DEBUG_ERR, (__location__ " Failed to allocate scripts\n"));
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goto done;
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}
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scripts->num_scripts = count;
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for (i = 0; i < count; i++) {
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struct ctdb_script_wire *s = &scripts->scripts[i];
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if (strlcpy(s->name, namelist[i]->d_name, sizeof(s->name)) >=
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sizeof(s->name)) {
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s->status = -ENAMETOOLONG;
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continue;
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}
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s->status = 0;
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if (!check_executable(ctdb->event_script_dir,
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namelist[i]->d_name)) {
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s->status = -errno;
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}
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}
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done:
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for (i=0; i<count; i++) {
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free(namelist[i]);
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}
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free(namelist);
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return scripts;
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}
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/* There cannot be more than 10 arguments to command helper. */
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#define MAX_HELPER_ARGS (10)
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static bool child_helper_args(TALLOC_CTX *mem_ctx, struct ctdb_context *ctdb,
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enum ctdb_eventscript_call call,
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const char *options,
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struct ctdb_script_wire *current, int fd,
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int *argc, const char ***argv)
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{
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const char **tmp;
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int n, i;
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char *t, *saveptr, *opt;
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tmp = talloc_array(mem_ctx, const char *, 10+1);
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if (tmp == NULL) goto failed;
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tmp[0] = talloc_asprintf(tmp, "%d", fd);
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tmp[1] = talloc_asprintf(tmp, "%s/%s", ctdb->event_script_dir, current->name);
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tmp[2] = talloc_asprintf(tmp, "%s", ctdb_eventscript_call_names[call]);
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n = 3;
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/* Split options into individual arguments */
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opt = talloc_strdup(mem_ctx, options);
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if (opt == NULL) {
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goto failed;
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}
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t = strtok_r(opt, " ", &saveptr);
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while (t != NULL) {
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tmp[n++] = talloc_strdup(tmp, t);
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if (n > MAX_HELPER_ARGS) {
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goto args_failed;
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}
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t = strtok_r(NULL, " ", &saveptr);
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}
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for (i=0; i<n; i++) {
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if (tmp[i] == NULL) {
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goto failed;
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}
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}
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/* Last argument should be NULL */
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tmp[n++] = NULL;
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*argc = n;
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*argv = tmp;
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return true;
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args_failed:
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DEBUG(DEBUG_ERR, (__location__ " too many arguments '%s' to eventscript '%s'\n",
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options, ctdb_eventscript_call_names[call]));
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failed:
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if (tmp) {
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talloc_free(tmp);
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}
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return false;
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}
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static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *p);
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static char helper_prog[PATH_MAX+1] = "";
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static int fork_child_for_script(struct ctdb_context *ctdb,
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struct ctdb_event_script_state *state)
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{
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int r;
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struct tevent_fd *fde;
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struct ctdb_script_wire *current = get_current_script(state);
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int argc;
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const char **argv;
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if (!ctdb_set_helper("event helper", helper_prog, sizeof(helper_prog),
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"CTDB_EVENT_HELPER",
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CTDB_HELPER_BINDIR, "ctdb_event_helper")) {
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ctdb_die(ctdb, __location__
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" Unable to set event helper\n");
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}
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current->start = timeval_current();
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r = pipe(state->fd);
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if (r != 0) {
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DEBUG(DEBUG_ERR, (__location__ " pipe failed for child eventscript process\n"));
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return -errno;
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}
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/* Arguments for helper */
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if (!child_helper_args(state, ctdb, state->call, state->options, current,
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state->fd[1], &argc, &argv)) {
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DEBUG(DEBUG_ERR, (__location__ " failed to create arguments for eventscript helper\n"));
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r = -ENOMEM;
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close(state->fd[0]);
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close(state->fd[1]);
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return r;
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}
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if (!ctdb_vfork_with_logging(state, ctdb, current->name,
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helper_prog, argc, argv,
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log_event_script_output,
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state, &state->child)) {
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talloc_free(argv);
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r = -errno;
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close(state->fd[0]);
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close(state->fd[1]);
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return r;
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}
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talloc_free(argv);
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close(state->fd[1]);
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set_close_on_exec(state->fd[0]);
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/* Set ourselves up to be called when that's done. */
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fde = event_add_fd(ctdb->ev, state, state->fd[0], EVENT_FD_READ,
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ctdb_event_script_handler, state);
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tevent_fd_set_auto_close(fde);
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return 0;
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}
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/*
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Summarize status of this run of scripts.
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*/
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static int script_status(struct ctdb_scripts_wire *scripts)
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{
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unsigned int i;
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for (i = 0; i < scripts->num_scripts; i++) {
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switch (scripts->scripts[i].status) {
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case -ENAMETOOLONG:
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case -ENOENT:
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case -ENOEXEC:
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/* Disabled or missing; that's OK. */
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break;
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case 0:
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/* No problem. */
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break;
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default:
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return scripts->scripts[i].status;
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}
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}
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/* All OK! */
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return 0;
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}
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/* called when child is finished */
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static void ctdb_event_script_handler(struct event_context *ev, struct fd_event *fde,
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uint16_t flags, void *p)
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{
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struct ctdb_event_script_state *state =
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talloc_get_type(p, struct ctdb_event_script_state);
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struct ctdb_script_wire *current = get_current_script(state);
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struct ctdb_context *ctdb = state->ctdb;
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int r, status;
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if (ctdb == NULL) {
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DEBUG(DEBUG_ERR,("Eventscript finished but ctdb is NULL\n"));
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return;
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}
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r = sys_read(state->fd[0], ¤t->status, sizeof(current->status));
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if (r < 0) {
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current->status = -errno;
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} else if (r == 0) {
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current->status = -EINTR;
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} else if (r != sizeof(current->status)) {
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current->status = -EIO;
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}
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current->finished = timeval_current();
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/* valgrind gets overloaded if we run next script as it's still doing
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* post-execution analysis, so kill finished child here. */
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if (ctdb->valgrinding) {
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ctdb_kill(ctdb, state->child, SIGKILL);
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}
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state->child = 0;
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status = script_status(state->scripts);
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/* Aborted or finished all scripts? We're done. */
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if (status != 0 || state->current+1 == state->scripts->num_scripts) {
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if (status != 0) {
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DEBUG(DEBUG_INFO,
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("Eventscript %s %s finished with state %d\n",
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ctdb_eventscript_call_names[state->call],
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state->options, status));
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}
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ctdb->event_script_timeouts = 0;
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talloc_free(state);
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return;
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}
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/* Forget about that old fd. */
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talloc_free(fde);
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/* Next script! */
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state->current++;
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current++;
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current->status = fork_child_for_script(ctdb, state);
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if (current->status != 0) {
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/* This calls the callback. */
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talloc_free(state);
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}
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}
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struct debug_hung_script_state {
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struct ctdb_context *ctdb;
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pid_t child;
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enum ctdb_eventscript_call call;
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};
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static int debug_hung_script_state_destructor(struct debug_hung_script_state *state)
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{
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if (state->child) {
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ctdb_kill(state->ctdb, state->child, SIGKILL);
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}
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return 0;
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}
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static void debug_hung_script_timeout(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *p)
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{
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struct debug_hung_script_state *state =
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talloc_get_type(p, struct debug_hung_script_state);
|
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|
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talloc_free(state);
|
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}
|
|
|
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static void debug_hung_script_done(struct tevent_context *ev, struct tevent_fd *fde,
|
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uint16_t flags, void *p)
|
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{
|
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struct debug_hung_script_state *state =
|
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talloc_get_type(p, struct debug_hung_script_state);
|
|
|
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talloc_free(state);
|
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}
|
|
|
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static void ctdb_run_debug_hung_script(struct ctdb_context *ctdb, struct debug_hung_script_state *state)
|
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{
|
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pid_t pid;
|
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const char * debug_hung_script = CTDB_ETCDIR "/debug-hung-script.sh";
|
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int fd[2];
|
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struct tevent_timer *ttimer;
|
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struct tevent_fd *tfd;
|
|
const char **argv;
|
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int i;
|
|
|
|
if (pipe(fd) < 0) {
|
|
DEBUG(DEBUG_ERR,("Failed to create pipe fd for debug hung script\n"));
|
|
return;
|
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}
|
|
|
|
if (getenv("CTDB_DEBUG_HUNG_SCRIPT") != NULL) {
|
|
debug_hung_script = getenv("CTDB_DEBUG_HUNG_SCRIPT");
|
|
}
|
|
|
|
argv = talloc_array(state, const char *, 5);
|
|
|
|
argv[0] = talloc_asprintf(argv, "%d", fd[1]);
|
|
argv[1] = talloc_strdup(argv, debug_hung_script);
|
|
argv[2] = talloc_asprintf(argv, "%d", state->child);
|
|
argv[3] = talloc_strdup(argv, ctdb_eventscript_call_names[state->call]);
|
|
argv[4] = NULL;
|
|
|
|
for (i=0; i<4; i++) {
|
|
if (argv[i] == NULL) {
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
talloc_free(argv);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
if (!ctdb_vfork_with_logging(state, ctdb, "Hung-script",
|
|
helper_prog, 5, argv, NULL, NULL, &pid)) {
|
|
DEBUG(DEBUG_ERR,("Failed to fork a child to track hung event script\n"));
|
|
talloc_free(argv);
|
|
close(fd[0]);
|
|
close(fd[1]);
|
|
return;
|
|
}
|
|
|
|
talloc_free(argv);
|
|
close(fd[1]);
|
|
|
|
ttimer = tevent_add_timer(ctdb->ev, state,
|
|
timeval_current_ofs(ctdb->tunable.script_timeout, 0),
|
|
debug_hung_script_timeout, state);
|
|
if (ttimer == NULL) {
|
|
close(fd[0]);
|
|
return;
|
|
}
|
|
|
|
tfd = tevent_add_fd(ctdb->ev, state, fd[0], EVENT_FD_READ,
|
|
debug_hung_script_done, state);
|
|
if (tfd == NULL) {
|
|
talloc_free(ttimer);
|
|
close(fd[0]);
|
|
return;
|
|
}
|
|
tevent_fd_set_auto_close(tfd);
|
|
}
|
|
|
|
/* 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;
|
|
struct ctdb_script_wire *current = get_current_script(state);
|
|
struct debug_hung_script_state *debug_state;
|
|
|
|
DEBUG(DEBUG_ERR,("Event script '%s %s %s' timed out after %.1fs, count: %u, pid: %d\n",
|
|
current->name, ctdb_eventscript_call_names[state->call], state->options,
|
|
timeval_elapsed(¤t->start),
|
|
ctdb->event_script_timeouts, state->child));
|
|
|
|
/* ignore timeouts for these events */
|
|
switch (state->call) {
|
|
case CTDB_EVENT_START_RECOVERY:
|
|
case CTDB_EVENT_RECOVERED:
|
|
case CTDB_EVENT_TAKE_IP:
|
|
case CTDB_EVENT_RELEASE_IP:
|
|
state->scripts->scripts[state->current].status = 0;
|
|
DEBUG(DEBUG_ERR,("Ignoring hung script for %s call %d\n", state->options, state->call));
|
|
break;
|
|
default:
|
|
state->scripts->scripts[state->current].status = -ETIME;
|
|
}
|
|
|
|
debug_state = talloc_zero(ctdb, struct debug_hung_script_state);
|
|
if (debug_state == NULL) {
|
|
talloc_free(state);
|
|
return;
|
|
}
|
|
|
|
/* Save information useful for running debug hung script, so
|
|
* eventscript state can be freed.
|
|
*/
|
|
debug_state->ctdb = ctdb;
|
|
debug_state->child = state->child;
|
|
debug_state->call = state->call;
|
|
|
|
/* This destructor will actually kill the hung event script */
|
|
talloc_set_destructor(debug_state, debug_hung_script_state_destructor);
|
|
|
|
state->child = 0;
|
|
talloc_free(state);
|
|
|
|
ctdb_run_debug_hung_script(ctdb, debug_state);
|
|
}
|
|
|
|
/*
|
|
destroy an event script: kill it if ->child != 0.
|
|
*/
|
|
static int event_script_destructor(struct ctdb_event_script_state *state)
|
|
{
|
|
int status;
|
|
struct event_script_callback *callback;
|
|
|
|
if (state->child) {
|
|
DEBUG(DEBUG_ERR,(__location__ " Sending SIGTERM to child pid:%d\n", state->child));
|
|
|
|
if (ctdb_kill(state->ctdb, state->child, SIGTERM) != 0) {
|
|
DEBUG(DEBUG_ERR,("Failed to kill child process for eventscript, errno %s(%d)\n", strerror(errno), errno));
|
|
}
|
|
}
|
|
|
|
/* If we were the current monitor, we no longer are. */
|
|
if (state->ctdb->current_monitor == state) {
|
|
state->ctdb->current_monitor = NULL;
|
|
}
|
|
|
|
/* Save our scripts as the last executed status, if we have them.
|
|
* See ctdb_event_script_callback_v where we abort monitor event. */
|
|
if (state->scripts) {
|
|
talloc_free(state->ctdb->last_status[state->call]);
|
|
state->ctdb->last_status[state->call] = state->scripts;
|
|
if (state->current < state->ctdb->last_status[state->call]->num_scripts) {
|
|
state->ctdb->last_status[state->call]->num_scripts = state->current+1;
|
|
}
|
|
}
|
|
|
|
/* Use last status as result, or "OK" if none. */
|
|
if (state->ctdb->last_status[state->call]) {
|
|
status = script_status(state->ctdb->last_status[state->call]);
|
|
} else {
|
|
status = 0;
|
|
}
|
|
|
|
state->ctdb->active_events--;
|
|
if (state->ctdb->active_events < 0) {
|
|
ctdb_fatal(state->ctdb, "Active events < 0");
|
|
}
|
|
|
|
/* This is allowed to free us; talloc will prevent double free anyway,
|
|
* but beware if you call this outside the destructor!
|
|
* the callback hangs off a different context so we walk the list
|
|
* of "active" callbacks until we find the one state points to.
|
|
* if we cant find it it means the callback has been removed.
|
|
*/
|
|
for (callback = state->ctdb->script_callbacks; callback != NULL; callback = callback->next) {
|
|
if (callback == state->callback) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
state->callback = NULL;
|
|
|
|
if (callback) {
|
|
/* Make sure destructor doesn't free itself! */
|
|
talloc_steal(NULL, callback);
|
|
callback->fn(state->ctdb, status, callback->private_data);
|
|
talloc_free(callback);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int count_words(const char *options)
|
|
{
|
|
unsigned int words = 0;
|
|
|
|
options += strspn(options, " \t");
|
|
while (*options) {
|
|
words++;
|
|
options += strcspn(options, " \t");
|
|
options += strspn(options, " \t");
|
|
}
|
|
return words;
|
|
}
|
|
|
|
static bool check_options(enum ctdb_eventscript_call call, const char *options)
|
|
{
|
|
switch (call) {
|
|
/* These all take no arguments. */
|
|
case CTDB_EVENT_INIT:
|
|
case CTDB_EVENT_SETUP:
|
|
case CTDB_EVENT_STARTUP:
|
|
case CTDB_EVENT_START_RECOVERY:
|
|
case CTDB_EVENT_RECOVERED:
|
|
case CTDB_EVENT_MONITOR:
|
|
case CTDB_EVENT_SHUTDOWN:
|
|
case CTDB_EVENT_IPREALLOCATED:
|
|
return count_words(options) == 0;
|
|
|
|
case CTDB_EVENT_TAKE_IP: /* interface, IP address, netmask bits. */
|
|
case CTDB_EVENT_RELEASE_IP:
|
|
return count_words(options) == 3;
|
|
|
|
case CTDB_EVENT_UPDATE_IP: /* old interface, new interface, IP address, netmask bits. */
|
|
return count_words(options) == 4;
|
|
|
|
default:
|
|
DEBUG(DEBUG_ERR,(__location__ "Unknown ctdb_eventscript_call %u\n", call));
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static int remove_callback(struct event_script_callback *callback)
|
|
{
|
|
DLIST_REMOVE(callback->ctdb->script_callbacks, callback);
|
|
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,
|
|
const void *mem_ctx,
|
|
void (*callback)(struct ctdb_context *, int, void *),
|
|
void *private_data,
|
|
enum ctdb_eventscript_call call,
|
|
const char *fmt, va_list ap)
|
|
{
|
|
struct ctdb_event_script_state *state;
|
|
|
|
if (ctdb->recovery_mode != CTDB_RECOVERY_NORMAL) {
|
|
/* we guarantee that only some specifically allowed event scripts are run
|
|
while in recovery */
|
|
const enum ctdb_eventscript_call allowed_calls[] = {
|
|
CTDB_EVENT_INIT,
|
|
CTDB_EVENT_SETUP,
|
|
CTDB_EVENT_START_RECOVERY,
|
|
CTDB_EVENT_SHUTDOWN,
|
|
CTDB_EVENT_RELEASE_IP,
|
|
CTDB_EVENT_IPREALLOCATED,
|
|
};
|
|
int i;
|
|
for (i=0;i<ARRAY_SIZE(allowed_calls);i++) {
|
|
if (call == allowed_calls[i]) break;
|
|
}
|
|
if (i == ARRAY_SIZE(allowed_calls)) {
|
|
DEBUG(DEBUG_ERR,("Refusing to run event scripts call '%s' while in recovery\n",
|
|
ctdb_eventscript_call_names[call]));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Do not run new monitor events if some event is already running */
|
|
if (call == CTDB_EVENT_MONITOR && ctdb->active_events > 0) {
|
|
if (callback != NULL) {
|
|
callback(ctdb, -ECANCELED, private_data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Kill off any running monitor events to run this event. */
|
|
if (ctdb->current_monitor) {
|
|
struct ctdb_event_script_state *ms = talloc_get_type(ctdb->current_monitor, struct ctdb_event_script_state);
|
|
|
|
/* Cancel current monitor callback state only if monitoring
|
|
* context ctdb->monitor->monitor_context has not been freed */
|
|
if (ms->callback != NULL && !ctdb_stopped_monitoring(ctdb)) {
|
|
ms->callback->fn(ctdb, -ECANCELED, ms->callback->private_data);
|
|
talloc_free(ms->callback);
|
|
}
|
|
|
|
/* Discard script status so we don't save to last_status */
|
|
talloc_free(ctdb->current_monitor->scripts);
|
|
ctdb->current_monitor->scripts = NULL;
|
|
talloc_free(ctdb->current_monitor);
|
|
ctdb->current_monitor = NULL;
|
|
}
|
|
|
|
state = talloc(ctdb->event_script_ctx, struct ctdb_event_script_state);
|
|
CTDB_NO_MEMORY(ctdb, state);
|
|
|
|
/* The callback isn't done if the context is freed. */
|
|
state->callback = talloc(mem_ctx, struct event_script_callback);
|
|
CTDB_NO_MEMORY(ctdb, state->callback);
|
|
DLIST_ADD(ctdb->script_callbacks, state->callback);
|
|
talloc_set_destructor(state->callback, remove_callback);
|
|
state->callback->ctdb = ctdb;
|
|
state->callback->fn = callback;
|
|
state->callback->private_data = private_data;
|
|
|
|
state->ctdb = ctdb;
|
|
state->call = call;
|
|
state->options = talloc_vasprintf(state, fmt, ap);
|
|
state->timeout = timeval_set(ctdb->tunable.script_timeout, 0);
|
|
state->scripts = NULL;
|
|
if (state->options == NULL) {
|
|
DEBUG(DEBUG_ERR, (__location__ " could not allocate state->options\n"));
|
|
talloc_free(state);
|
|
return -1;
|
|
}
|
|
if (!check_options(state->call, state->options)) {
|
|
DEBUG(DEBUG_ERR, ("Bad eventscript options '%s' for '%s'\n",
|
|
state->options,
|
|
ctdb_eventscript_call_names[state->call]));
|
|
talloc_free(state);
|
|
return -1;
|
|
}
|
|
|
|
DEBUG(DEBUG_INFO,(__location__ " Starting eventscript %s %s\n",
|
|
ctdb_eventscript_call_names[state->call],
|
|
state->options));
|
|
|
|
/* This is not a child of state, since we save it in destructor. */
|
|
state->scripts = ctdb_get_script_list(ctdb, ctdb);
|
|
if (state->scripts == NULL) {
|
|
talloc_free(state);
|
|
return -1;
|
|
}
|
|
state->current = 0;
|
|
state->child = 0;
|
|
|
|
if (call == CTDB_EVENT_MONITOR) {
|
|
ctdb->current_monitor = state;
|
|
}
|
|
|
|
talloc_set_destructor(state, event_script_destructor);
|
|
|
|
ctdb->active_events++;
|
|
|
|
/* Nothing to do? */
|
|
if (state->scripts->num_scripts == 0) {
|
|
talloc_free(state);
|
|
return 0;
|
|
}
|
|
|
|
state->scripts->scripts[0].status = fork_child_for_script(ctdb, state);
|
|
if (state->scripts->scripts[0].status != 0) {
|
|
/* Callback is called from destructor, with fail result. */
|
|
talloc_free(state);
|
|
return 0;
|
|
}
|
|
|
|
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 %s called with no timeout\n",
|
|
ctdb_eventscript_call_names[state->call],
|
|
state->options));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
run the event script in the background, calling the callback when
|
|
finished. If mem_ctx is freed, callback will never be called.
|
|
*/
|
|
int ctdb_event_script_callback(struct ctdb_context *ctdb,
|
|
TALLOC_CTX *mem_ctx,
|
|
void (*callback)(struct ctdb_context *, int, void *),
|
|
void *private_data,
|
|
enum ctdb_eventscript_call call,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = ctdb_event_script_callback_v(ctdb, mem_ctx, callback, private_data, call, 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_args(struct ctdb_context *ctdb, enum ctdb_eventscript_call call,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
struct callback_status status;
|
|
|
|
va_start(ap, fmt);
|
|
ret = ctdb_event_script_callback_v(ctdb, ctdb,
|
|
event_script_callback, &status, call, 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 */;
|
|
|
|
if (status.status == -ETIME) {
|
|
DEBUG(DEBUG_ERR, (__location__ " eventscript for '%s' timedout."
|
|
" Immediately banning ourself for %d seconds\n",
|
|
ctdb_eventscript_call_names[call],
|
|
ctdb->tunable.recovery_ban_period));
|
|
|
|
/* Don't ban self if CTDB is starting up or shutting down */
|
|
if (call != CTDB_EVENT_INIT && call != CTDB_EVENT_SHUTDOWN) {
|
|
ctdb_ban_self(ctdb);
|
|
}
|
|
}
|
|
|
|
return status.status;
|
|
}
|
|
|
|
int ctdb_event_script(struct ctdb_context *ctdb, enum ctdb_eventscript_call call)
|
|
{
|
|
/* GCC complains about empty format string, so use %s and "". */
|
|
return ctdb_event_script_args(ctdb, call, "%s", "");
|
|
}
|
|
|
|
struct eventscript_callback_state {
|
|
struct ctdb_req_control *c;
|
|
};
|
|
|
|
/*
|
|
called when a forced eventscript run has finished
|
|
*/
|
|
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);
|
|
|
|
if (status != 0) {
|
|
DEBUG(DEBUG_ERR,(__location__ " Failed to 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;
|
|
}
|
|
|
|
|
|
/* Returns rest of string, or NULL if no match. */
|
|
static const char *get_call(const char *p, enum ctdb_eventscript_call *call)
|
|
{
|
|
unsigned int len;
|
|
|
|
/* Skip any initial whitespace. */
|
|
p += strspn(p, " \t");
|
|
|
|
/* See if we match any. */
|
|
for (*call = 0; *call < CTDB_EVENT_MAX; (*call)++) {
|
|
len = strlen(ctdb_eventscript_call_names[*call]);
|
|
if (strncmp(p, ctdb_eventscript_call_names[*call], len) == 0) {
|
|
/* If end of string or whitespace, we're done. */
|
|
if (strcspn(p + len, " \t") == 0) {
|
|
return p + len;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
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;
|
|
const char *options;
|
|
enum ctdb_eventscript_call call;
|
|
|
|
/* Figure out what call they want. */
|
|
options = get_call((const char *)indata.dptr, &call);
|
|
if (!options) {
|
|
DEBUG(DEBUG_ERR, (__location__ " Invalid event name \"%s\"\n", (const char *)indata.dptr));
|
|
return -1;
|
|
}
|
|
|
|
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->event_script_ctx, struct eventscript_callback_state);
|
|
CTDB_NO_MEMORY(ctdb, state);
|
|
|
|
state->c = talloc_steal(state, c);
|
|
|
|
DEBUG(DEBUG_NOTICE,("Running eventscripts with arguments %s\n", indata.dptr));
|
|
|
|
ret = ctdb_event_script_callback(ctdb,
|
|
state, run_eventscripts_callback, state,
|
|
call, "%s", options);
|
|
|
|
if (ret != 0) {
|
|
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;
|
|
}
|