#include "collectd.h"
#include "common.h"
#include "plugin.h"
+#include "utils_cmd_putval.h"
#include <sys/types.h>
#include <pwd.h>
+#include <grp.h>
#include <signal.h>
#include <pthread.h>
+#define PL_NORMAL 0x01
+#define PL_NOTIF_ACTION 0x02
+#define PL_NAGIOS_PLUGIN 0x04
+
/*
* Private data types
*/
struct program_list_s
{
char *user;
+ char *group;
char *exec;
+ char **argv;
int pid;
+ int status;
+ int flags;
program_list_t *next;
};
/*
* Private variables
*/
-static const char *config_keys[] =
-{
- "Exec"
-};
-static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
-
static program_list_t *pl_head = NULL;
/*
* Functions
*/
-static int exec_config (const char *key, const char *value)
+static void sigchld_handler (int signal) /* {{{ */
{
- if (strcasecmp ("Exec", key) == 0)
+ pid_t pid;
+ int status;
+ while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
{
program_list_t *pl;
- pl = (program_list_t *) malloc (sizeof (program_list_t));
- if (pl == NULL)
- return (1);
- memset (pl, '\0', sizeof (program_list_t));
+ for (pl = pl_head; pl != NULL; pl = pl->next)
+ if (pl->pid == pid)
+ break;
+ if (pl != NULL)
+ pl->status = status;
+ } /* while (waitpid) */
+} /* void sigchld_handler }}} */
+
+static int exec_config_exec (oconfig_item_t *ci) /* {{{ */
+{
+ program_list_t *pl;
+ char buffer[128];
+ int i;
- pl->user = strdup (value);
- if (pl->user == NULL)
- {
- sfree (pl);
- return (1);
- }
+ if (ci->children_num != 0)
+ {
+ WARNING ("exec plugin: The config option `%s' may not be a block.",
+ ci->key);
+ return (-1);
+ }
+ if (ci->values_num < 2)
+ {
+ WARNING ("exec plugin: The config option `%s' needs at least two "
+ "arguments.", ci->key);
+ return (-1);
+ }
+ if ((ci->values[0].type != OCONFIG_TYPE_STRING)
+ || (ci->values[1].type != OCONFIG_TYPE_STRING))
+ {
+ WARNING ("exec plugin: The first two arguments to the `%s' option must "
+ "be string arguments.", ci->key);
+ return (-1);
+ }
+
+ pl = (program_list_t *) malloc (sizeof (program_list_t));
+ if (pl == NULL)
+ {
+ ERROR ("exec plugin: malloc failed.");
+ return (-1);
+ }
+ memset (pl, '\0', sizeof (program_list_t));
+
+ if (strcasecmp ("NagiosExec", ci->key) == 0)
+ pl->flags |= PL_NAGIOS_PLUGIN;
+ else if (strcasecmp ("NotificationExec", ci->key) == 0)
+ pl->flags |= PL_NOTIF_ACTION;
+ else
+ pl->flags |= PL_NORMAL;
+
+ pl->user = strdup (ci->values[0].value.string);
+ if (pl->user == NULL)
+ {
+ ERROR ("exec plugin: strdup failed.");
+ sfree (pl);
+ return (-1);
+ }
+
+ pl->group = strchr (pl->user, ':');
+ if (pl->group != NULL)
+ {
+ *pl->group = '\0';
+ pl->group++;
+ }
- pl->exec = strchr (pl->user, ' ');
- if (pl->exec == NULL)
+ pl->exec = strdup (ci->values[1].value.string);
+ if (pl->exec == NULL)
+ {
+ ERROR ("exec plugin: strdup failed.");
+ sfree (pl->user);
+ sfree (pl);
+ return (-1);
+ }
+
+ pl->argv = (char **) malloc (ci->values_num * sizeof (char *));
+ if (pl->argv == NULL)
+ {
+ ERROR ("exec plugin: malloc failed.");
+ sfree (pl->exec);
+ sfree (pl->user);
+ sfree (pl);
+ return (-1);
+ }
+ memset (pl->argv, '\0', ci->values_num * sizeof (char *));
+
+ {
+ char *tmp = strrchr (ci->values[1].value.string, '/');
+ if (tmp == NULL)
+ strncpy (buffer, ci->values[1].value.string, sizeof (buffer));
+ else
+ strncpy (buffer, tmp + 1, sizeof (buffer));
+ buffer[sizeof (buffer) - 1] = '\0';
+ }
+ pl->argv[0] = strdup (buffer);
+ if (pl->argv[0] == NULL)
+ {
+ ERROR ("exec plugin: malloc failed.");
+ sfree (pl->argv);
+ sfree (pl->exec);
+ sfree (pl->user);
+ sfree (pl);
+ return (-1);
+ }
+
+ for (i = 1; i < (ci->values_num - 1); i++)
+ {
+ if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
{
- sfree (pl->user);
- sfree (pl);
- return (1);
+ pl->argv[i] = strdup (ci->values[i + 1].value.string);
}
- while (*pl->exec == ' ')
+ else
{
- *pl->exec = '\0';
- pl->exec++;
+ if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
+ {
+ snprintf (buffer, sizeof (buffer), "%lf",
+ ci->values[i + 1].value.number);
+ }
+ else
+ {
+ if (ci->values[i + 1].value.boolean)
+ strncpy (buffer, "true", sizeof (buffer));
+ else
+ strncpy (buffer, "false", sizeof (buffer));
+ }
+ buffer[sizeof (buffer) - 1] = '\0';
+
+ pl->argv[i] = strdup (buffer);
}
- if (*pl->exec == '\0')
+ if (pl->argv[i] == NULL)
{
- sfree (pl->user);
- sfree (pl);
- return (1);
+ ERROR ("exec plugin: strdup failed.");
+ break;
}
+ } /* for (i) */
- pl->next = pl_head;
- pl_head = pl;
- }
- else
+ if (i < (ci->values_num - 1))
{
+ while ((--i) >= 0)
+ {
+ sfree (pl->argv[i]);
+ }
+ sfree (pl->argv);
+ sfree (pl->exec);
+ sfree (pl->user);
+ sfree (pl);
return (-1);
}
- return (0);
-} /* int exec_config */
-
-static void submit_counter (const char *type_instance, counter_t value)
-{
- value_t values[1];
- value_list_t vl = VALUE_LIST_INIT;
-
- DEBUG ("type_instance = %s; value = %llu;", type_instance, value);
-
- values[0].counter = value;
+ for (i = 0; pl->argv[i] != NULL; i++)
+ {
+ DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
+ }
- vl.values = values;
- vl.values_len = 1;
- vl.time = time (NULL);
- strcpy (vl.host, hostname_g);
- strcpy (vl.plugin, "exec");
- strcpy (vl.plugin_instance, "");
- strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
+ pl->next = pl_head;
+ pl_head = pl;
- plugin_dispatch_values ("counter", &vl);
-} /* void submit_counter */
+ return (0);
+} /* int exec_config_exec }}} */
-static void submit_gauge (const char *type_instance, gauge_t value)
+static int exec_config (oconfig_item_t *ci) /* {{{ */
{
- value_t values[1];
- value_list_t vl = VALUE_LIST_INIT;
-
- DEBUG ("type_instance = %s; value = %lf;", type_instance, value);
+ int i;
- values[0].gauge = value;
-
- vl.values = values;
- vl.values_len = 1;
- vl.time = time (NULL);
- strcpy (vl.host, hostname_g);
- strcpy (vl.plugin, "exec");
- strcpy (vl.plugin_instance, "");
- strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
+ for (i = 0; i < ci->children_num; i++)
+ {
+ oconfig_item_t *child = ci->children + i;
+ if ((strcasecmp ("Exec", child->key) == 0)
+ || (strcasecmp ("NagiosExec", child->key) == 0)
+ || (strcasecmp ("NotificationExec", child->key) == 0))
+ exec_config_exec (child);
+ else
+ {
+ WARNING ("exec plugin: Unknown config option `%s'.", child->key);
+ }
+ } /* for (i) */
- plugin_dispatch_values ("gauge", &vl);
-} /* void submit_counter */
+ return (0);
+} /* int exec_config }}} */
-static void exec_child (program_list_t *pl)
+static void exec_child (program_list_t *pl) /* {{{ */
{
int status;
int uid;
- char *arg0;
+ int gid;
+ int egid;
struct passwd *sp_ptr;
struct passwd sp;
- char pwnambuf[2048];
+ char nambuf[2048];
char errbuf[1024];
sp_ptr = NULL;
- status = getpwnam_r (pl->user, &sp, pwnambuf, sizeof (pwnambuf), &sp_ptr);
+ status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
if (status != 0)
{
ERROR ("exec plugin: getpwnam_r failed: %s",
}
uid = sp.pw_uid;
+ gid = sp.pw_gid;
if (uid == 0)
{
ERROR ("exec plugin: Cowardly refusing to exec program as root.");
exit (-1);
}
- status = setuid (uid);
+ /* The group configured in the configfile is set as effective group, because
+ * this way the forked process can (re-)gain the user's primary group. */
+ egid = -1;
+ if (NULL != pl->group)
+ {
+ if ('\0' != *pl->group) {
+ struct group *gr_ptr = NULL;
+ struct group gr;
+
+ status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
+ if (0 != status)
+ {
+ ERROR ("exec plugin: getgrnam_r failed: %s",
+ sstrerror (errno, errbuf, sizeof (errbuf)));
+ exit (-1);
+ }
+ if (NULL == gr_ptr)
+ {
+ ERROR ("exec plugin: No such group: `%s'", pl->group);
+ exit (-1);
+ }
+
+ egid = gr.gr_gid;
+ }
+ else
+ {
+ egid = gid;
+ }
+ } /* if (pl->group == NULL) */
+
+ status = setgid (gid);
if (status != 0)
{
- ERROR ("exec plugin: setuid failed: %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
+ ERROR ("exec plugin: setgid (%i) failed: %s",
+ gid, sstrerror (errno, errbuf, sizeof (errbuf)));
exit (-1);
}
- arg0 = strrchr (pl->exec, '/');
- if (arg0 != NULL)
- arg0++;
- if ((arg0 == NULL) || (*arg0 == '\0'))
- arg0 = pl->exec;
+ if (egid != -1)
+ {
+ status = setegid (egid);
+ if (status != 0)
+ {
+ ERROR ("exec plugin: setegid (%i) failed: %s",
+ egid, sstrerror (errno, errbuf, sizeof (errbuf)));
+ exit (-1);
+ }
+ }
+
+ status = setuid (uid);
+ if (status != 0)
+ {
+ ERROR ("exec plugin: setuid (%i) failed: %s",
+ uid, sstrerror (errno, errbuf, sizeof (errbuf)));
+ exit (-1);
+ }
- status = execlp (pl->exec, arg0, (char *) 0);
+ status = execvp (pl->exec, pl->argv);
ERROR ("exec plugin: exec failed: %s",
sstrerror (errno, errbuf, sizeof (errbuf)));
exit (-1);
-} /* void exec_child */
+} /* void exec_child }}} */
-static int fork_child (program_list_t *pl)
+static int fork_child (program_list_t *pl) /* {{{ */
{
int fd_pipe[2];
int status;
close (fd_pipe[1]);
return (fd_pipe[0]);
-} /* int fork_child */
+} /* int fork_child }}} */
-static void *exec_read_one (void *arg)
+static int parse_line (char *buffer) /* {{{ */
+{
+ char *fields[256];
+ int fields_num;
+
+ fields[0] = "PUTVAL";
+ fields_num = strsplit (buffer, &fields[1], STATIC_ARRAY_SIZE(fields) - 1);
+
+ handle_putval (stdout, fields, fields_num + 1);
+ return (0);
+} /* int parse_line }}} */
+
+static void *exec_read_one (void *arg) /* {{{ */
{
program_list_t *pl = (program_list_t *) arg;
int fd;
FILE *fh;
char buffer[1024];
+ int status;
fd = fork_child (pl);
if (fd < 0)
ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
sstrerror (errno, errbuf, sizeof (errbuf)));
kill (pl->pid, SIGTERM);
+ pl->pid = 0;
close (fd);
pthread_exit ((void *) 1);
}
+ buffer[0] = '\0';
while (fgets (buffer, sizeof (buffer), fh) != NULL)
{
int len;
- char *type;
- char *type_instance;
- char *value;
-
- DEBUG ("buffer = %s", buffer);
len = strlen (buffer);
- if (len < 5)
- continue;
- if (buffer[0] == '#')
- continue;
+ /* Remove newline from end. */
+ while ((len > 0) && ((buffer[len - 1] == '\n')
+ || (buffer[len - 1] == '\r')))
+ buffer[--len] = '\0';
- type = buffer;
+ DEBUG ("exec plugin: exec_read_one: buffer = %s", buffer);
- type_instance = strchr (type, ',');
- if (type_instance == NULL)
- continue;
- *type_instance = '\0';
- type_instance++;
+ if (pl->flags & PL_NAGIOS_PLUGIN)
+ break;
- if ((strcasecmp ("counter", type) != 0)
- && (strcasecmp ("gauge", type) != 0))
- {
- WARNING ("exec plugin: Received invalid type: %s", type);
- continue;
- }
+ parse_line (buffer);
+ } /* while (fgets) */
- value = strchr (type_instance, ',');
- if (value == NULL)
- continue;
- *value = '\0';
- value++;
+ fclose (fh);
- DEBUG ("value = %s", value);
+ if (waitpid (pl->pid, &status, 0) > 0)
+ pl->status = status;
- if (strcasecmp ("counter", type) == 0)
- submit_counter (type_instance, atoll (value));
- else
- submit_gauge (type_instance, atof (value));
- } /* while (fgets) */
+ DEBUG ("exec plugin: Child %i exited with status %i.",
+ (int) pl->pid, pl->status);
- fclose (fh);
- pl->pid = 0;
+ if (pl->flags & PL_NAGIOS_PLUGIN)
+ {
+ notification_t n;
+
+ memset (&n, '\0', sizeof (n));
+
+ n.severity = NOTIF_FAILURE;
+ if (pl->status == 0)
+ n.severity = NOTIF_OKAY;
+ else if (pl->status == 1)
+ n.severity = NOTIF_WARNING;
+ strncpy (n.message, buffer, sizeof (n.message));
+ n.message[sizeof (n.message) - 1] = '\0';
+
+ n.time = time (NULL);
+
+ strncpy (n.host, hostname_g, sizeof (n.host));
+ n.host[sizeof (n.host) - 1] = '\0';
+
+ plugin_dispatch_notification (&n);
+ }
+
+ pl->pid = 0;
pthread_exit ((void *) 0);
return (NULL);
-} /* void *exec_read_one */
+} /* void *exec_read_one }}} */
+
+static int exec_init (void) /* {{{ */
+{
+ struct sigaction sa;
+
+ memset (&sa, '\0', sizeof (sa));
+ sa.sa_handler = sigchld_handler;
+ sigaction (SIGCHLD, &sa, NULL);
+
+ return (0);
+} /* int exec_init }}} */
-static int exec_read (void)
+static int exec_read (void) /* {{{ */
{
program_list_t *pl;
} /* for (pl) */
return (0);
-} /* int exec_read */
+} /* int exec_read }}} */
-static int exec_shutdown (void)
+static int exec_shutdown (void) /* {{{ */
{
program_list_t *pl;
program_list_t *next;
pl_head = NULL;
return (0);
-} /* int exec_shutdown */
+} /* int exec_shutdown }}} */
void module_register (void)
{
- plugin_register_config ("exec", exec_config, config_keys, config_keys_num);
+ plugin_register_complex_config ("exec", exec_config);
+ plugin_register_init ("exec", exec_init);
plugin_register_read ("exec", exec_read);
plugin_register_shutdown ("exec", exec_shutdown);
} /* void module_register */
/*
- * vim:shiftwidth=2:softtabstop=2:tabstop=8
+ * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
*/
projects / collectd.git / blobdiff