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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license from the top-level
* OPENSOLARIS.LICENSE or <http://opensource.org/licenses/CDDL-1.0>.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each file
* and include the License file from the top-level OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
* Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
*/
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include "zed_file.h"
#include "zed_log.h"
#include "zed_strings.h"
#define ZEVENT_FILENO 3
/*
* Create an environment string array for passing to execve() using the
* NAME=VALUE strings in container [zsp].
* Return a newly-allocated environment, or NULL on error.
*/
static char **
_zed_exec_create_env(zed_strings_t *zsp)
{
int num_ptrs;
int buflen;
char *buf;
char **pp;
char *p;
const char *q;
int i;
int len;
num_ptrs = zed_strings_count(zsp) + 1;
buflen = num_ptrs * sizeof (char *);
for (q = zed_strings_first(zsp); q; q = zed_strings_next(zsp))
buflen += strlen(q) + 1;
buf = malloc(buflen);
if (!buf)
return (NULL);
pp = (char **) buf;
p = buf + (num_ptrs * sizeof (char *));
i = 0;
for (q = zed_strings_first(zsp); q; q = zed_strings_next(zsp)) {
pp[i] = p;
len = strlen(q) + 1;
memcpy(p, q, len);
p += len;
i++;
}
pp[i] = NULL;
assert(buf + buflen == p);
return ((char **) buf);
}
/*
* Fork a child process to handle event [eid]. The program [prog]
* in directory [dir] is executed with the envionment [env].
* The file descriptor [zfd] is the zevent_fd used to track the
* current cursor location within the zevent nvlist.
*/
static void
_zed_exec_fork_child(uint64_t eid, const char *dir, const char *prog,
char *env[], int zfd)
{
char path[PATH_MAX];
int n;
pid_t pid;
int fd;
pid_t wpid;
int status;
assert(dir != NULL);
assert(prog != NULL);
assert(env != NULL);
assert(zfd >= 0);
n = snprintf(path, sizeof (path), "%s/%s", dir, prog);
if ((n < 0) || (n >= sizeof (path))) {
zed_log_msg(LOG_WARNING,
"Failed to fork \"%s\" for eid=%llu: %s",
prog, eid, strerror(ENAMETOOLONG));
return;
}
pid = fork();
if (pid < 0) {
zed_log_msg(LOG_WARNING,
"Failed to fork \"%s\" for eid=%llu: %s",
prog, eid, strerror(errno));
return;
} else if (pid == 0) {
(void) umask(022);
fd = open("/dev/null", O_RDWR);
(void) dup2(fd, STDIN_FILENO);
(void) dup2(fd, STDOUT_FILENO);
(void) dup2(fd, STDERR_FILENO);
(void) dup2(zfd, ZEVENT_FILENO);
zed_file_close_from(ZEVENT_FILENO + 1);
execle(path, prog, NULL, env);
_exit(127);
} else {
zed_log_msg(LOG_INFO, "Invoking \"%s\" eid=%llu pid=%d",
prog, eid, pid);
/* FIXME: Timeout rogue child processes with sigalarm? */
restart:
wpid = waitpid(pid, &status, 0);
if (wpid == (pid_t) -1) {
if (errno == EINTR)
goto restart;
zed_log_msg(LOG_WARNING,
"Failed to wait for \"%s\" eid=%llu pid=%d",
prog, eid, pid);
} else if (WIFEXITED(status)) {
zed_log_msg(LOG_INFO,
"Finished \"%s\" eid=%llu pid=%d exit=%d",
prog, eid, pid, WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
zed_log_msg(LOG_INFO,
"Finished \"%s\" eid=%llu pid=%d sig=%d/%s",
prog, eid, pid, WTERMSIG(status),
strsignal(WTERMSIG(status)));
} else {
zed_log_msg(LOG_INFO,
"Finished \"%s\" eid=%llu pid=%d status=0x%X",
prog, eid, (unsigned int) status);
}
}
}
/*
* Process the event [eid] by synchronously invoking all scripts with a
* matching class prefix.
* Each executable in [scripts] from the directory [dir] is matched against
* the event's [class], [subclass], and the "all" class (which matches
* all events). Every script with a matching class prefix is invoked.
* The NAME=VALUE strings in [envs] will be passed to the script as
* environment variables.
* The file descriptor [zfd] is the zevent_fd used to track the
* current cursor location within the zevent nvlist.
* Return 0 on success, -1 on error.
*/
int
zed_exec_process(uint64_t eid, const char *class, const char *subclass,
const char *dir, zed_strings_t *scripts, zed_strings_t *envs, int zfd)
{
const char *class_strings[4];
const char *allclass = "all";
const char **csp;
const char *s;
char **e;
int n;
if (!dir || !scripts || !envs || zfd < 0)
return (-1);
csp = class_strings;
if (class)
*csp++ = class;
if (subclass)
*csp++ = subclass;
if (allclass)
*csp++ = allclass;
*csp = NULL;
e = _zed_exec_create_env(envs);
for (s = zed_strings_first(scripts); s; s = zed_strings_next(scripts)) {
for (csp = class_strings; *csp; csp++) {
n = strlen(*csp);
if ((strncmp(s, *csp, n) == 0) && !isalpha(s[n]))
_zed_exec_fork_child(eid, dir, s, e, zfd);
}
}
free(e);
return (0);
}
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