/*
* Copyright 2010-2020 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include <unistd.h>
#include <dirent.h>
#include <grp.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "crm/crm.h"
#include "crm/common/mainloop.h"
#include "crm/services.h"
#include "services_private.h"
static void close_pipe(int fildes[]);
/* We have two alternative ways of handling SIGCHLD when synchronously waiting
* for spawned processes to complete. Both rely on polling a file descriptor to
* discover SIGCHLD events.
*
* If sys/signalfd.h is available (e.g. on Linux), we call signalfd() to
* generate the file descriptor. Otherwise, we use the "self-pipe trick"
* (opening a pipe and writing a byte to it when SIGCHLD is received).
*/
#ifdef HAVE_SYS_SIGNALFD_H
// signalfd() implementation
#include <sys/signalfd.h>
// Everything needed to manage SIGCHLD handling
struct sigchld_data_s {
sigset_t mask; // Signals to block now (including SIGCHLD)
sigset_t old_mask; // Previous set of blocked signals
};
// Initialize SIGCHLD data and prepare for use
static bool
sigchld_setup(struct sigchld_data_s *data)
{
sigemptyset(&(data->mask));
sigaddset(&(data->mask), SIGCHLD);
sigemptyset(&(data->old_mask));
// Block SIGCHLD (saving previous set of blocked signals to restore later)
if (sigprocmask(SIG_BLOCK, &(data->mask), &(data->old_mask)) < 0) {
crm_err("Wait for child process completion failed: %s "
CRM_XS " source=sigprocmask", pcmk_strerror(errno));
return false;
}
return true;
}
// Get a file descriptor suitable for polling for SIGCHLD events
static int
sigchld_open(struct sigchld_data_s *data)
{
int fd;
CRM_CHECK(data != NULL, return -1);
fd = signalfd(-1, &(data->mask), SFD_NONBLOCK);
if (fd < 0) {
crm_err("Wait for child process completion failed: %s "
CRM_XS " source=signalfd", pcmk_strerror(errno));
}
return fd;
}
// Close a file descriptor returned by sigchld_open()
static void
sigchld_close(int fd)
{
if (fd > 0) {
close(fd);
}
}
// Return true if SIGCHLD was received from polled fd
static bool
sigchld_received(int fd)
{
struct signalfd_siginfo fdsi;
ssize_t s;
if (fd < 0) {
return false;
}
s = read(fd, &fdsi, sizeof(struct signalfd_siginfo));
if (s != sizeof(struct signalfd_siginfo)) {
crm_err("Wait for child process completion failed: %s "
CRM_XS " source=read", pcmk_strerror(errno));
} else if (fdsi.ssi_signo == SIGCHLD) {
return true;
}
return false;
}
// Do anything needed after done waiting for SIGCHLD
static void
sigchld_cleanup(struct sigchld_data_s *data)
{
// Restore the original set of blocked signals
if ((sigismember(&(data->old_mask), SIGCHLD) == 0)
&& (sigprocmask(SIG_UNBLOCK, &(data->mask), NULL) < 0)) {
crm_warn("Could not clean up after child process completion: %s",
pcmk_strerror(errno));
}
}
#else // HAVE_SYS_SIGNALFD_H not defined
// Self-pipe implementation (see above for function descriptions)
struct sigchld_data_s {
int pipe_fd[2]; // Pipe file descriptors
struct sigaction sa; // Signal handling info (with SIGCHLD)
struct sigaction old_sa; // Previous signal handling info
};
// We need a global to use in the signal handler
volatile struct sigchld_data_s *last_sigchld_data = NULL;
static void
sigchld_handler()
{
// We received a SIGCHLD, so trigger pipe polling
if ((last_sigchld_data != NULL)
&& (last_sigchld_data->pipe_fd[1] >= 0)
&& (write(last_sigchld_data->pipe_fd[1], "", 1) == -1)) {
crm_err("Wait for child process completion failed: %s "
CRM_XS " source=write", pcmk_strerror(errno));
}
}
static bool
sigchld_setup(struct sigchld_data_s *data)
{
int rc;
data->pipe_fd[0] = data->pipe_fd[1] = -1;
if (pipe(data->pipe_fd) == -1) {
crm_err("Wait for child process completion failed: %s "
CRM_XS " source=pipe", pcmk_strerror(errno));
return false;
}
rc = pcmk__set_nonblocking(data->pipe_fd[0]);
if (rc != pcmk_rc_ok) {
crm_warn("Could not set pipe input non-blocking: %s " CRM_XS " rc=%d",
pcmk_rc_str(rc), rc);
}
rc = pcmk__set_nonblocking(data->pipe_fd[1]);
if (rc != pcmk_rc_ok) {
crm_warn("Could not set pipe output non-blocking: %s " CRM_XS " rc=%d",
pcmk_rc_str(rc), rc);
}
// Set SIGCHLD handler
data->sa.sa_handler = sigchld_handler;
data->sa.sa_flags = 0;
sigemptyset(&(data->sa.sa_mask));
if (sigaction(SIGCHLD, &(data->sa), &(data->old_sa)) < 0) {
crm_err("Wait for child process completion failed: %s "
CRM_XS " source=sigaction", pcmk_strerror(errno));
}
// Remember data for use in signal handler
last_sigchld_data = data;
return true;
}
static int
sigchld_open(struct sigchld_data_s *data)
{
CRM_CHECK(data != NULL, return -1);
return data->pipe_fd[0];
}
static void
sigchld_close(int fd)
{
// Pipe will be closed in sigchld_cleanup()
return;
}
static bool
sigchld_received(int fd)
{
char ch;
if (fd < 0) {
return false;
}
// Clear out the self-pipe
while (read(fd, &ch, 1) == 1) /*omit*/;
return true;
}
static void
sigchld_cleanup(struct sigchld_data_s *data)
{
// Restore the previous SIGCHLD handler
if (sigaction(SIGCHLD, &(data->old_sa), NULL) < 0) {
crm_warn("Could not clean up after child process completion: %s",
pcmk_strerror(errno));
}
close_pipe(data->pipe_fd);
}
#endif
/*!
* \internal
* \brief Close the two file descriptors of a pipe
*
* \param[in] fildes Array of file descriptors opened by pipe()
*/
static void
close_pipe(int fildes[])
{
if (fildes[0] >= 0) {
close(fildes[0]);
fildes[0] = -1;
}
if (fildes[1] >= 0) {
close(fildes[1]);
fildes[1] = -1;
}
}
static gboolean
svc_read_output(int fd, svc_action_t * op, bool is_stderr)
{
char *data = NULL;
int rc = 0, len = 0;
char buf[500];
static const size_t buf_read_len = sizeof(buf) - 1;
if (fd < 0) {
crm_trace("No fd for %s", op->id);
return FALSE;
}
if (is_stderr && op->stderr_data) {
len = strlen(op->stderr_data);
data = op->stderr_data;
crm_trace("Reading %s stderr into offset %d", op->id, len);
} else if (is_stderr == FALSE && op->stdout_data) {
len = strlen(op->stdout_data);
data = op->stdout_data;
crm_trace("Reading %s stdout into offset %d", op->id, len);
} else {
crm_trace("Reading %s %s into offset %d", op->id, is_stderr?"stderr":"stdout", len);
}
do {
rc = read(fd, buf, buf_read_len);
if (rc > 0) {
buf[rc] = 0;
crm_trace("Got %d chars: %.80s", rc, buf);
data = pcmk__realloc(data, len + rc + 1);
len += sprintf(data + len, "%s", buf);
} else if (errno != EINTR) {
/* error or EOF
* Cleanup happens in pipe_done()
*/
rc = FALSE;
break;
}
} while (rc == buf_read_len || rc < 0);
if (is_stderr) {
op->stderr_data = data;
} else {
op->stdout_data = data;
}
return rc;
}
static int
dispatch_stdout(gpointer userdata)
{
svc_action_t *op = (svc_action_t *) userdata;
return svc_read_output(op->opaque->stdout_fd, op, FALSE);
}
static int
dispatch_stderr(gpointer userdata)
{
svc_action_t *op = (svc_action_t *) userdata;
return svc_read_output(op->opaque->stderr_fd, op, TRUE);
}
static void
pipe_out_done(gpointer user_data)
{
svc_action_t *op = (svc_action_t *) user_data;
crm_trace("%p", op);
op->opaque->stdout_gsource = NULL;
if (op->opaque->stdout_fd > STDOUT_FILENO) {
close(op->opaque->stdout_fd);
}
op->opaque->stdout_fd = -1;
}
static void
pipe_err_done(gpointer user_data)
{
svc_action_t *op = (svc_action_t *) user_data;
op->opaque->stderr_gsource = NULL;
if (op->opaque->stderr_fd > STDERR_FILENO) {
close(op->opaque->stderr_fd);
}
op->opaque->stderr_fd = -1;
}
static struct mainloop_fd_callbacks stdout_callbacks = {
.dispatch = dispatch_stdout,
.destroy = pipe_out_done,
};
static struct mainloop_fd_callbacks stderr_callbacks = {
.dispatch = dispatch_stderr,
.destroy = pipe_err_done,
};
static void
set_ocf_env(const char *key, const char *value, gpointer user_data)
{
if (setenv(key, value, 1) != 0) {
crm_perror(LOG_ERR, "setenv failed for key:%s and value:%s", key, value);
}
}
static void
set_ocf_env_with_prefix(gpointer key, gpointer value, gpointer user_data)
{
char buffer[500];
snprintf(buffer, sizeof(buffer), strcmp(key, "OCF_CHECK_LEVEL") != 0 ? "OCF_RESKEY_%s" : "%s", (char *)key);
set_ocf_env(buffer, value, user_data);
}
static void
set_alert_env(gpointer key, gpointer value, gpointer user_data)
{
int rc;
if (value != NULL) {
rc = setenv(key, value, 1);
} else {
rc = unsetenv(key);
}
if (rc < 0) {
crm_perror(LOG_ERR, "setenv %s=%s",
(char*)key, (value? (char*)value : ""));
} else {
crm_trace("setenv %s=%s", (char*)key, (value? (char*)value : ""));
}
}
/*!
* \internal
* \brief Add environment variables suitable for an action
*
* \param[in] op Action to use
*/
static void
add_action_env_vars(const svc_action_t *op)
{
void (*env_setter)(gpointer, gpointer, gpointer) = NULL;
if (op->agent == NULL) {
env_setter = set_alert_env; /* we deal with alert handler */
} else if (pcmk__str_eq(op->standard, PCMK_RESOURCE_CLASS_OCF, pcmk__str_casei)) {
env_setter = set_ocf_env_with_prefix;
}
if (env_setter != NULL && op->params != NULL) {
g_hash_table_foreach(op->params, env_setter, NULL);
}
if (env_setter == NULL || env_setter == set_alert_env) {
return;
}
set_ocf_env("OCF_RA_VERSION_MAJOR", "1", NULL);
set_ocf_env("OCF_RA_VERSION_MINOR", "0", NULL);
set_ocf_env("OCF_ROOT", OCF_ROOT_DIR, NULL);
set_ocf_env("OCF_EXIT_REASON_PREFIX", PCMK_OCF_REASON_PREFIX, NULL);
if (op->rsc) {
set_ocf_env("OCF_RESOURCE_INSTANCE", op->rsc, NULL);
}
if (op->agent != NULL) {
set_ocf_env("OCF_RESOURCE_TYPE", op->agent, NULL);
}
/* Notes: this is not added to specification yet. Sept 10,2004 */
if (op->provider != NULL) {
set_ocf_env("OCF_RESOURCE_PROVIDER", op->provider, NULL);
}
}
static void
pipe_in_single_parameter(gpointer key, gpointer value, gpointer user_data)
{
svc_action_t *op = user_data;
char *buffer = crm_strdup_printf("%s=%s\n", (char *)key, (char *) value);
int ret, total = 0, len = strlen(buffer);
do {
errno = 0;
ret = write(op->opaque->stdin_fd, buffer + total, len - total);
if (ret > 0) {
total += ret;
}
} while ((errno == EINTR) && (total < len));
free(buffer);
}
/*!
* \internal
* \brief Pipe parameters in via stdin for action
*
* \param[in] op Action to use
*/
static void
pipe_in_action_stdin_parameters(const svc_action_t *op)
{
crm_debug("sending args");
if (op->params) {
g_hash_table_foreach(op->params, pipe_in_single_parameter, (gpointer) op);
}
}
gboolean
recurring_action_timer(gpointer data)
{
svc_action_t *op = data;
crm_debug("Scheduling another invocation of %s", op->id);
/* Clean out the old result */
free(op->stdout_data);
op->stdout_data = NULL;
free(op->stderr_data);
op->stderr_data = NULL;
op->opaque->repeat_timer = 0;
services_action_async(op, NULL);
return FALSE;
}
/* Returns FALSE if 'op' should be free'd by the caller */
gboolean
operation_finalize(svc_action_t * op)
{
int recurring = 0;
if (op->interval_ms) {
if (op->cancel) {
op->status = PCMK_LRM_OP_CANCELLED;
cancel_recurring_action(op);
} else {
recurring = 1;
op->opaque->repeat_timer = g_timeout_add(op->interval_ms,
recurring_action_timer, (void *)op);
}
}
if (op->opaque->callback) {
op->opaque->callback(op);
}
op->pid = 0;
services_untrack_op(op);
if (!recurring && op->synchronous == FALSE) {
/*
* If this is a recurring action, do not free explicitly.
* It will get freed whenever the action gets cancelled.
*/
services_action_free(op);
return TRUE;
}
services_action_cleanup(op);
return FALSE;
}
static void
close_op_input(svc_action_t *op)
{
if (op->opaque->stdin_fd >= 0) {
close(op->opaque->stdin_fd);
}
}
static void
finish_op_output(svc_action_t *op, bool is_stderr)
{
mainloop_io_t **source;
int fd;
if (is_stderr) {
source = &(op->opaque->stderr_gsource);
fd = op->opaque->stderr_fd;
} else {
source = &(op->opaque->stdout_gsource);
fd = op->opaque->stdout_fd;
}
if (op->synchronous || *source) {
crm_trace("Finish reading %s[%d] %s",
op->id, op->pid, (is_stderr? "stdout" : "stderr"));
svc_read_output(fd, op, is_stderr);
if (op->synchronous) {
close(fd);
} else {
mainloop_del_fd(*source);
*source = NULL;
}
}
}
// Log an operation's stdout and stderr
static void
log_op_output(svc_action_t *op)
{
char *prefix = crm_strdup_printf("%s[%d] error output", op->id, op->pid);
crm_log_output(LOG_NOTICE, prefix, op->stderr_data);
strcpy(prefix + strlen(prefix) - strlen("error output"), "output");
crm_log_output(LOG_DEBUG, prefix, op->stdout_data);
free(prefix);
}
static void
operation_finished(mainloop_child_t * p, pid_t pid, int core, int signo, int exitcode)
{
svc_action_t *op = mainloop_child_userdata(p);
mainloop_clear_child_userdata(p);
CRM_ASSERT(op->pid == pid);
/* Depending on the priority the mainloop gives the stdout and stderr
* file descriptors, this function could be called before everything has
* been read from them, so force a final read now.
*/
finish_op_output(op, true);
finish_op_output(op, false);
close_op_input(op);
if (signo == 0) {
crm_debug("%s[%d] exited with status %d", op->id, op->pid, exitcode);
op->status = PCMK_LRM_OP_DONE;
op->rc = exitcode;
} else if (mainloop_child_timeout(p)) {
crm_warn("%s[%d] timed out after %dms", op->id, op->pid, op->timeout);
op->status = PCMK_LRM_OP_TIMEOUT;
op->rc = PCMK_OCF_TIMEOUT;
} else if (op->cancel) {
/* If an in-flight recurring operation was killed because it was
* cancelled, don't treat that as a failure.
*/
crm_info("%s[%d] terminated with signal: %s " CRM_XS " (%d)",
op->id, op->pid, strsignal(signo), signo);
op->status = PCMK_LRM_OP_CANCELLED;
op->rc = PCMK_OCF_OK;
} else {
crm_warn("%s[%d] terminated with signal: %s " CRM_XS " (%d)",
op->id, op->pid, strsignal(signo), signo);
op->status = PCMK_LRM_OP_ERROR;
op->rc = PCMK_OCF_SIGNAL;
}
log_op_output(op);
operation_finalize(op);
}
/*!
* \internal
* \brief Set operation rc and status per errno from stat(), fork() or execvp()
*
* \param[in,out] op Operation to set rc and status for
* \param[in] error Value of errno after system call
*
* \return void
*/
static void
services_handle_exec_error(svc_action_t * op, int error)
{
int rc_not_installed, rc_insufficient_priv, rc_exec_error;
/* Mimic the return codes for each standard as that's what we'll convert back from in get_uniform_rc() */
if (pcmk__str_eq(op->standard, PCMK_RESOURCE_CLASS_LSB, pcmk__str_casei)
&& pcmk__str_eq(op->action, "status", pcmk__str_casei)) {
rc_not_installed = PCMK_LSB_STATUS_NOT_INSTALLED;
rc_insufficient_priv = PCMK_LSB_STATUS_INSUFFICIENT_PRIV;
rc_exec_error = PCMK_LSB_STATUS_UNKNOWN;
#if SUPPORT_NAGIOS
} else if (pcmk__str_eq(op->standard, PCMK_RESOURCE_CLASS_NAGIOS, pcmk__str_casei)) {
rc_not_installed = NAGIOS_NOT_INSTALLED;
rc_insufficient_priv = NAGIOS_INSUFFICIENT_PRIV;
rc_exec_error = PCMK_OCF_EXEC_ERROR;
#endif
} else {
rc_not_installed = PCMK_OCF_NOT_INSTALLED;
rc_insufficient_priv = PCMK_OCF_INSUFFICIENT_PRIV;
rc_exec_error = PCMK_OCF_EXEC_ERROR;
}
switch (error) { /* see execve(2), stat(2) and fork(2) */
case ENOENT: /* No such file or directory */
case EISDIR: /* Is a directory */
case ENOTDIR: /* Path component is not a directory */
case EINVAL: /* Invalid executable format */
case ENOEXEC: /* Invalid executable format */
op->rc = rc_not_installed;
op->status = PCMK_LRM_OP_NOT_INSTALLED;
break;
case EACCES: /* permission denied (various errors) */
case EPERM: /* permission denied (various errors) */
op->rc = rc_insufficient_priv;
op->status = PCMK_LRM_OP_ERROR;
break;
default:
op->rc = rc_exec_error;
op->status = PCMK_LRM_OP_ERROR;
}
}
static void
action_launch_child(svc_action_t *op)
{
/* SIGPIPE is ignored (which is different from signal blocking) by the gnutls library.
* Depending on the libqb version in use, libqb may set SIGPIPE to be ignored as well.
* We do not want this to be inherited by the child process. By resetting this the signal
* to the default behavior, we avoid some potential odd problems that occur during OCF
* scripts when SIGPIPE is ignored by the environment. */
signal(SIGPIPE, SIG_DFL);
#if defined(HAVE_SCHED_SETSCHEDULER)
if (sched_getscheduler(0) != SCHED_OTHER) {
struct sched_param sp;
memset(&sp, 0, sizeof(sp));
sp.sched_priority = 0;
if (sched_setscheduler(0, SCHED_OTHER, &sp) == -1) {
crm_perror(LOG_ERR, "Could not reset scheduling policy to SCHED_OTHER for %s", op->id);
}
}
#endif
if (setpriority(PRIO_PROCESS, 0, 0) == -1) {
crm_perror(LOG_ERR, "Could not reset process priority to 0 for %s", op->id);
}
/* Man: The call setpgrp() is equivalent to setpgid(0,0)
* _and_ compiles on BSD variants too
* need to investigate if it works the same too.
*/
setpgid(0, 0);
pcmk__close_fds_in_child(false);
#if SUPPORT_CIBSECRETS
if (pcmk__substitute_secrets(op->rsc, op->params) != pcmk_rc_ok) {
/* replacing secrets failed! */
if (pcmk__str_eq(op->action, "stop", pcmk__str_casei)) {
/* don't fail on stop! */
crm_info("proceeding with the stop operation for %s", op->rsc);
} else {
crm_err("failed to get secrets for %s, "
"considering resource not configured", op->rsc);
_exit(PCMK_OCF_NOT_CONFIGURED);
}
}
#endif
add_action_env_vars(op);
/* Become the desired user */
if (op->opaque->uid && (geteuid() == 0)) {
// If requested, set effective group
if (op->opaque->gid && (setgid(op->opaque->gid) < 0)) {
crm_perror(LOG_ERR, "Could not set child group to %d", op->opaque->gid);
_exit(PCMK_OCF_NOT_CONFIGURED);
}
// Erase supplementary group list
// (We could do initgroups() if we kept a copy of the username)
if (setgroups(0, NULL) < 0) {
crm_perror(LOG_ERR, "Could not set child groups");
_exit(PCMK_OCF_NOT_CONFIGURED);
}
// Set effective user
if (setuid(op->opaque->uid) < 0) {
crm_perror(LOG_ERR, "setting user to %d", op->opaque->uid);
_exit(PCMK_OCF_NOT_CONFIGURED);
}
}
/* execute the RA */
execvp(op->opaque->exec, op->opaque->args);
/* Most cases should have been already handled by stat() */
services_handle_exec_error(op, errno);
_exit(op->rc);
}
static void
action_synced_wait(svc_action_t *op, struct sigchld_data_s *data)
{
int status = 0;
int timeout = op->timeout;
time_t start = -1;
struct pollfd fds[3];
int wait_rc = 0;
fds[0].fd = op->opaque->stdout_fd;
fds[0].events = POLLIN;
fds[0].revents = 0;
fds[1].fd = op->opaque->stderr_fd;
fds[1].events = POLLIN;
fds[1].revents = 0;
fds[2].fd = sigchld_open(data);
fds[2].events = POLLIN;
fds[2].revents = 0;
crm_trace("Waiting for %s[%d]", op->id, op->pid);
start = time(NULL);
do {
int poll_rc = poll(fds, 3, timeout);
if (poll_rc > 0) {
if (fds[0].revents & POLLIN) {
svc_read_output(op->opaque->stdout_fd, op, FALSE);
}
if (fds[1].revents & POLLIN) {
svc_read_output(op->opaque->stderr_fd, op, TRUE);
}
if ((fds[2].revents & POLLIN) && sigchld_received(fds[2].fd)) {
wait_rc = waitpid(op->pid, &status, WNOHANG);
if ((wait_rc > 0) || ((wait_rc < 0) && (errno == ECHILD))) {
// Child process exited or doesn't exist
break;
} else if (wait_rc < 0) {
crm_warn("Wait for completion of %s[%d] failed: %s "
CRM_XS " source=waitpid",
op->id, op->pid, pcmk_strerror(errno));
wait_rc = 0; // Act as if process is still running
}
}
} else if (poll_rc == 0) {
// Poll timed out with no descriptors ready
timeout = 0;
break;
} else if ((poll_rc < 0) && (errno != EINTR)) {
crm_err("Wait for completion of %s[%d] failed: %s "
CRM_XS " source=poll",
op->id, op->pid, pcmk_strerror(errno));
break;
}
timeout = op->timeout - (time(NULL) - start) * 1000;
} while ((op->timeout < 0 || timeout > 0));
crm_trace("Stopped waiting for %s[%d]", op->id, op->pid);
if (wait_rc <= 0) {
op->rc = PCMK_OCF_UNKNOWN_ERROR;
if (op->timeout > 0 && timeout <= 0) {
op->status = PCMK_LRM_OP_TIMEOUT;
crm_warn("%s[%d] timed out after %dms",
op->id, op->pid, op->timeout);
} else {
op->status = PCMK_LRM_OP_ERROR;
}
/* If only child hasn't been successfully waited for, yet.
This is to limit killing wrong target a bit more. */
if (wait_rc == 0 && waitpid(op->pid, &status, WNOHANG) == 0) {
if (kill(op->pid, SIGKILL)) {
crm_warn("Could not kill rogue child %s[%d]: %s",
op->id, op->pid, pcmk_strerror(errno));
}
/* Safe to skip WNOHANG here as we sent non-ignorable signal. */
while (waitpid(op->pid, &status, 0) == (pid_t) -1 && errno == EINTR) /*omit*/;
}
} else if (WIFEXITED(status)) {
op->status = PCMK_LRM_OP_DONE;
op->rc = WEXITSTATUS(status);
crm_info("%s[%d] exited with status %d", op->id, op->pid, op->rc);
} else if (WIFSIGNALED(status)) {
int signo = WTERMSIG(status);
op->status = PCMK_LRM_OP_ERROR;
crm_err("%s[%d] terminated with signal: %s " CRM_XS " (%d)",
op->id, op->pid, strsignal(signo), signo);
}
#ifdef WCOREDUMP
if (WCOREDUMP(status)) {
crm_err("%s[%d] dumped core", op->id, op->pid);
}
#endif
finish_op_output(op, true);
finish_op_output(op, false);
close_op_input(op);
sigchld_close(fds[2].fd);
}
/* For an asynchronous 'op', returns FALSE if 'op' should be free'd by the caller */
/* For a synchronous 'op', returns FALSE if 'op' fails */
gboolean
services_os_action_execute(svc_action_t * op)
{
int stdout_fd[2];
int stderr_fd[2];
int stdin_fd[2] = {-1, -1};
int rc;
struct stat st;
struct sigchld_data_s data;
/* Fail fast */
if(stat(op->opaque->exec, &st) != 0) {
rc = errno;
crm_warn("Cannot execute '%s': %s " CRM_XS " stat rc=%d",
op->opaque->exec, pcmk_strerror(rc), rc);
services_handle_exec_error(op, rc);
if (!op->synchronous) {
return operation_finalize(op);
}
return FALSE;
}
if (pipe(stdout_fd) < 0) {
rc = errno;
crm_err("Cannot execute '%s': %s " CRM_XS " pipe(stdout) rc=%d",
op->opaque->exec, pcmk_strerror(rc), rc);
services_handle_exec_error(op, rc);
if (!op->synchronous) {
return operation_finalize(op);
}
return FALSE;
}
if (pipe(stderr_fd) < 0) {
rc = errno;
close_pipe(stdout_fd);
crm_err("Cannot execute '%s': %s " CRM_XS " pipe(stderr) rc=%d",
op->opaque->exec, pcmk_strerror(rc), rc);
services_handle_exec_error(op, rc);
if (!op->synchronous) {
return operation_finalize(op);
}
return FALSE;
}
if (pcmk_is_set(pcmk_get_ra_caps(op->standard), pcmk_ra_cap_stdin)) {
if (pipe(stdin_fd) < 0) {
rc = errno;
close_pipe(stdout_fd);
close_pipe(stderr_fd);
crm_err("Cannot execute '%s': %s " CRM_XS " pipe(stdin) rc=%d",
op->opaque->exec, pcmk_strerror(rc), rc);
services_handle_exec_error(op, rc);
if (!op->synchronous) {
return operation_finalize(op);
}
return FALSE;
}
}
if (op->synchronous && !sigchld_setup(&data)) {
close_pipe(stdin_fd);
close_pipe(stdout_fd);
close_pipe(stderr_fd);
sigchld_cleanup(&data);
return FALSE;
}
op->pid = fork();
switch (op->pid) {
case -1:
rc = errno;
close_pipe(stdin_fd);
close_pipe(stdout_fd);
close_pipe(stderr_fd);
crm_err("Cannot execute '%s': %s " CRM_XS " fork rc=%d",
op->opaque->exec, pcmk_strerror(rc), rc);
services_handle_exec_error(op, rc);
if (!op->synchronous) {
return operation_finalize(op);
}
sigchld_cleanup(&data);
return FALSE;
case 0: /* Child */
close(stdout_fd[0]);
close(stderr_fd[0]);
if (stdin_fd[1] >= 0) {
close(stdin_fd[1]);
}
if (STDOUT_FILENO != stdout_fd[1]) {
if (dup2(stdout_fd[1], STDOUT_FILENO) != STDOUT_FILENO) {
crm_warn("Can't redirect output from '%s': %s "
CRM_XS " errno=%d",
op->opaque->exec, pcmk_strerror(errno), errno);
}
close(stdout_fd[1]);
}
if (STDERR_FILENO != stderr_fd[1]) {
if (dup2(stderr_fd[1], STDERR_FILENO) != STDERR_FILENO) {
crm_warn("Can't redirect error output from '%s': %s "
CRM_XS " errno=%d",
op->opaque->exec, pcmk_strerror(errno), errno);
}
close(stderr_fd[1]);
}
if ((stdin_fd[0] >= 0) &&
(STDIN_FILENO != stdin_fd[0])) {
if (dup2(stdin_fd[0], STDIN_FILENO) != STDIN_FILENO) {
crm_warn("Can't redirect input to '%s': %s "
CRM_XS " errno=%d",
op->opaque->exec, pcmk_strerror(errno), errno);
}
close(stdin_fd[0]);
}
if (op->synchronous) {
sigchld_cleanup(&data);
}
action_launch_child(op);
CRM_ASSERT(0); /* action_launch_child is effectively noreturn */
}
/* Only the parent reaches here */
close(stdout_fd[1]);
close(stderr_fd[1]);
if (stdin_fd[0] >= 0) {
close(stdin_fd[0]);
}
op->opaque->stdout_fd = stdout_fd[0];
rc = pcmk__set_nonblocking(op->opaque->stdout_fd);
if (rc != pcmk_rc_ok) {
crm_warn("Could not set '%s' output non-blocking: %s "
CRM_XS " rc=%d",
op->opaque->exec, pcmk_rc_str(rc), rc);
}
op->opaque->stderr_fd = stderr_fd[0];
rc = pcmk__set_nonblocking(op->opaque->stderr_fd);
if (rc != pcmk_rc_ok) {
crm_warn("Could not set '%s' error output non-blocking: %s "
CRM_XS " rc=%d",
op->opaque->exec, pcmk_rc_str(rc), rc);
}
op->opaque->stdin_fd = stdin_fd[1];
if (op->opaque->stdin_fd >= 0) {
// using buffer behind non-blocking-fd here - that could be improved
// as long as no other standard uses stdin_fd assume stonith
rc = pcmk__set_nonblocking(op->opaque->stdin_fd);
if (rc != pcmk_rc_ok) {
crm_warn("Could not set '%s' input non-blocking: %s "
CRM_XS " fd=%d,rc=%d", op->opaque->exec,
pcmk_rc_str(rc), op->opaque->stdin_fd, rc);
}
pipe_in_action_stdin_parameters(op);
// as long as we are handling parameters directly in here just close
close(op->opaque->stdin_fd);
op->opaque->stdin_fd = -1;
}
// after fds are setup properly and before we plug anything into mainloop
if (op->opaque->fork_callback) {
op->opaque->fork_callback(op);
}
if (op->synchronous) {
action_synced_wait(op, &data);
sigchld_cleanup(&data);
} else {
crm_trace("Waiting async for '%s'[%d]", op->opaque->exec, op->pid);
mainloop_child_add_with_flags(op->pid,
op->timeout,
op->id,
op,
(op->flags & SVC_ACTION_LEAVE_GROUP) ? mainloop_leave_pid_group : 0,
operation_finished);
op->opaque->stdout_gsource = mainloop_add_fd(op->id,
G_PRIORITY_LOW,
op->opaque->stdout_fd, op, &stdout_callbacks);
op->opaque->stderr_gsource = mainloop_add_fd(op->id,
G_PRIORITY_LOW,
op->opaque->stderr_fd, op, &stderr_callbacks);
services_add_inflight_op(op);
}
return TRUE;
}
GList *
services_os_get_directory_list(const char *root, gboolean files, gboolean executable)
{
GList *list = NULL;
struct dirent **namelist;
int entries = 0, lpc = 0;
char buffer[PATH_MAX];
entries = scandir(root, &namelist, NULL, alphasort);
if (entries <= 0) {
return list;
}
for (lpc = 0; lpc < entries; lpc++) {
struct stat sb;
if ('.' == namelist[lpc]->d_name[0]) {
free(namelist[lpc]);
continue;
}
snprintf(buffer, sizeof(buffer), "%s/%s", root, namelist[lpc]->d_name);
if (stat(buffer, &sb)) {
continue;
}
if (S_ISDIR(sb.st_mode)) {
if (files) {
free(namelist[lpc]);
continue;
}
} else if (S_ISREG(sb.st_mode)) {
if (files == FALSE) {
free(namelist[lpc]);
continue;
} else if (executable
&& (sb.st_mode & S_IXUSR) == 0
&& (sb.st_mode & S_IXGRP) == 0 && (sb.st_mode & S_IXOTH) == 0) {
free(namelist[lpc]);
continue;
}
}
list = g_list_append(list, strdup(namelist[lpc]->d_name));
free(namelist[lpc]);
}
free(namelist);
return list;
}
GList *
resources_os_list_ocf_providers(void)
{
return get_directory_list(OCF_ROOT_DIR "/resource.d", FALSE, TRUE);
}
GList *
resources_os_list_ocf_agents(const char *provider)
{
GList *gIter = NULL;
GList *result = NULL;
GList *providers = NULL;
if (provider) {
char buffer[500];
snprintf(buffer, sizeof(buffer), "%s/resource.d/%s", OCF_ROOT_DIR, provider);
return get_directory_list(buffer, TRUE, TRUE);
}
providers = resources_os_list_ocf_providers();
for (gIter = providers; gIter != NULL; gIter = gIter->next) {
GList *tmp1 = result;
GList *tmp2 = resources_os_list_ocf_agents(gIter->data);
if (tmp2) {
result = g_list_concat(tmp1, tmp2);
}
}
g_list_free_full(providers, free);
return result;
}
gboolean
services__ocf_agent_exists(const char *provider, const char *agent)
{
char *buf = NULL;
gboolean rc = FALSE;
struct stat st;
if (provider == NULL || agent == NULL) {
return rc;
}
buf = crm_strdup_printf(OCF_ROOT_DIR "/resource.d/%s/%s", provider, agent);
if (stat(buf, &st) == 0) {
rc = TRUE;
}
free(buf);
return rc;
}