email plugin: Made socket settings configurable.

Added config file support to the email plugin.

The following options are available:
* "SocketGroup <group name>"
  Set the group the UNIX socket belongs to to <group name>.
* "SocketPerms <perms>"
  Set the permissions of the UNIX socket to <perms>. No validation is done.
  The user has to make sure reasonable values are given.
* "MaxConns <conns>"
  The maximum number of concurrent connections is set to <conns>.

<perms> and <conns> may be given as decimal (no prefix), octal (prefix "0") or
sedecimal (a.k.a. hexadecimal, prefix "0x") values.

Signed-off-by: Sebastian Harl <sh@tokkee.org>

diff --git a/src/email.c b/src/email.c
index 8d2c891..6838ead 100644 (file)
--- a/src/email.c
+++ b/src/email.c
@@ -38,6 +38,8 @@
 #include "common.h"
 #include "plugin.h"
 
+#include "configfile.h"
+
 #if HAVE_LIBPTHREAD
 # include <pthread.h>
 # define EMAIL_HAVE_READ 1
@@ -112,6 +114,21 @@ typedef struct {
  * Private variables
  */
 #if EMAIL_HAVE_READ
+/* valid configuration file keys */
+static char *config_keys[] =
+{
+       "SocketGroup",
+       "SocketPerms",
+       "MaxConns",
+       NULL
+};
+static int config_keys_num = 3;
+
+/* socket configuration */
+static char *sock_group = COLLECTD_GRP_NAME;
+static int  sock_perms  = S_IRWXU | S_IRWXG;
+static int  max_conns   = MAX_CONNS;
+
 /* state of the plugin */
 static int disabled = 0;
 
@@ -176,6 +193,31 @@ static char *check_ds_def[] =
 static int check_ds_num = 1;
 
 #if EMAIL_HAVE_READ
+static int email_config (char *key, char *value)
+{
+       if (0 == strcasecmp (key, "SocketGroup")) {
+               sock_group = sstrdup (value);
+       }
+       else if (0 == strcasecmp (key, "SocketPerms")) {
+               /* the user is responsible for providing reasonable values */
+               sock_perms = (int)strtol (value, NULL, 0);
+       }
+       else if (0 == strcasecmp (key, "MaxConns")) {
+               long int tmp = strtol (value, NULL, 0);
+
+               if (INT_MAX < tmp) {
+                       max_conns = INT_MAX;
+               }
+               else {
+                       max_conns = (int)tmp;
+               }
+       }
+       else {
+               return -1;
+       }
+       return 0;
+} /* static int email_config (char *, char *) */
+
 /* Increment the value of the given name in the given list by incr. */
 static void type_list_incr (type_list_t *list, char *name, int incr)
 {
@@ -510,7 +552,7 @@ static void *open_connection (void *arg)
                struct group *grp;
 
                errno = 0;
-               if (NULL != (grp = getgrnam (COLLECTD_GRP_NAME))) {
+               if (NULL != (grp = getgrnam (sock_group))) {
                        errno = 0;
                        if (0 != chown (SOCK_PATH, (uid_t)-1, grp->gr_gid)) {
                                syslog (LOG_WARNING, "chown() failed: %s", strerror (errno));
@@ -525,7 +567,7 @@ static void *open_connection (void *arg)
        }
 
        errno = 0;
-       if (0 != chmod (SOCK_PATH, S_IRWXU | S_IRWXG)) {
+       if (0 != chmod (SOCK_PATH, sock_perms)) {
                syslog (LOG_WARNING, "chmod() failed: %s", strerror (errno));
        }
 
@@ -543,7 +585,7 @@ static void *open_connection (void *arg)
 
                last = available.head;
 
-               for (i = 1; i < MAX_CONNS; ++i) {
+               for (i = 1; i < max_conns; ++i) {
                        last->next = (collector_t *)smalloc (sizeof (collector_t));
                        last = last->next;
                        available.tail = last;
@@ -784,6 +826,9 @@ void module_register (void)
        plugin_register ("email_size", NULL, NULL, size_write);
        plugin_register ("email_spam_score", NULL, NULL, score_write);
        plugin_register ("email_spam_check", NULL, NULL, check_write);
+#if EMAIL_HAVE_READ
+       cf_register (MODULE_NAME, email_config, config_keys, config_keys_num);
+#endif /* EMAIL_HAVE_READ */
        return;
 } /* void module_register (void) */