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/**
* collectd - src/notify_email.c
* Copyright (C) 2008 Oleg King
* Copyright (C) 2010 Florian Forster
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Oleg King <king2 at kaluga.ru>
* Florian Forster <octo at collectd.org>
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#include <auth-client.h>
#include <libesmtp.h>
#include <pthread.h>
#define MAXSTRING 256
static const char *config_keys[] =
{
"SMTPServer",
"SMTPPort",
"SMTPUser",
"SMTPPassword",
"From",
"Recipient",
"Subject"
};
static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
static char **recipients;
static int recipients_len = 0;
static smtp_session_t session;
static pthread_mutex_t session_lock = PTHREAD_MUTEX_INITIALIZER;
static smtp_message_t message;
static auth_context_t authctx = NULL;
static int smtp_port = 25;
static char *smtp_host = NULL;
static char *smtp_user = NULL;
static char *smtp_password = NULL;
static char *email_from = NULL;
static char *email_subject = NULL;
#define DEFAULT_SMTP_HOST "localhost"
#define DEFAULT_SMTP_FROM "root@localhost"
#define DEFAULT_SMTP_SUBJECT "Collectd notify: %s@%s"
/* Callback to get username and password */
static int authinteract (auth_client_request_t request, char **result,
int fields, void __attribute__((unused)) *arg)
{
int i;
for (i = 0; i < fields; i++)
{
if (request[i].flags & AUTH_USER)
result[i] = smtp_user;
else if (request[i].flags & AUTH_PASS)
result[i] = smtp_password;
else
return 0;
}
return 1;
} /* int authinteract */
/* Callback to print the recipient status */
static void print_recipient_status (smtp_recipient_t recipient,
const char *mailbox, void __attribute__((unused)) *arg)
{
const smtp_status_t *status;
status = smtp_recipient_status (recipient);
if (status->text[strlen(status->text) - 2] == '\r')
status->text[strlen(status->text) - 2] = 0;
INFO ("notify_email: notify sent to %s: %d %s", mailbox, status->code,
status->text);
} /* void print_recipient_status */
/* Callback to monitor SMTP activity */
static void monitor_cb (const char *buf, int buflen, int writing,
void __attribute__((unused)) *arg)
{
char log_str[MAXSTRING];
sstrncpy (log_str, buf, sizeof (log_str));
if (buflen > 2)
log_str[buflen - 2] = 0; /* replace \n with \0 */
if (writing == SMTP_CB_HEADERS) {
DEBUG ("notify_email plugin: SMTP --- H: %s", log_str);
return;
}
DEBUG (writing
? "notify_email plugin: SMTP >>> C: %s"
: "notify_email plugin: SMTP <<< S: %s",
log_str);
} /* void monitor_cb */
static int notify_email_init (void)
{
char server[MAXSTRING];
ssnprintf(server, sizeof (server), "%s:%i",
(smtp_host == NULL) ? DEFAULT_SMTP_HOST : smtp_host,
smtp_port);
pthread_mutex_lock (&session_lock);
auth_client_init();
session = smtp_create_session ();
if (session == NULL) {
pthread_mutex_unlock (&session_lock);
ERROR ("notify_email plugin: cannot create SMTP session");
return (-1);
}
smtp_set_monitorcb (session, monitor_cb, NULL, 1);
smtp_set_hostname (session, hostname_g);
smtp_set_server (session, server);
if (smtp_user && smtp_password) {
authctx = auth_create_context ();
auth_set_mechanism_flags (authctx, AUTH_PLUGIN_PLAIN, 0);
auth_set_interact_cb (authctx, authinteract, NULL);
}
if ( !smtp_auth_set_context (session, authctx)) {
pthread_mutex_unlock (&session_lock);
ERROR ("notify_email plugin: cannot set SMTP auth context");
return (-1);
}
pthread_mutex_unlock (&session_lock);
return (0);
} /* int notify_email_init */
static int notify_email_shutdown (void)
{
pthread_mutex_lock (&session_lock);
if (session != NULL)
smtp_destroy_session (session);
session = NULL;
if (authctx != NULL)
auth_destroy_context (authctx);
authctx = NULL;
auth_client_exit();
pthread_mutex_unlock (&session_lock);
return (0);
} /* int notify_email_shutdown */
static int notify_email_config (const char *key, const char *value)
{
if (strcasecmp (key, "Recipient") == 0)
{
char **tmp;
tmp = (char **) realloc ((void *) recipients, (recipients_len + 1) * sizeof (char *));
if (tmp == NULL) {
ERROR ("notify_email: realloc failed.");
return (-1);
}
recipients = tmp;
recipients[recipients_len] = strdup (value);
if (recipients[recipients_len] == NULL) {
ERROR ("notify_email: strdup failed.");
return (-1);
}
recipients_len++;
}
else if (0 == strcasecmp (key, "SMTPServer")) {
sfree (smtp_host);
smtp_host = strdup (value);
}
else if (0 == strcasecmp (key, "SMTPPort")) {
int port_tmp = atoi (value);
if (port_tmp < 1 || port_tmp > 65535)
{
WARNING ("notify_email plugin: Invalid SMTP port: %i", port_tmp);
return (1);
}
smtp_port = port_tmp;
}
else if (0 == strcasecmp (key, "SMTPUser")) {
sfree (smtp_user);
smtp_user = strdup (value);
}
else if (0 == strcasecmp (key, "SMTPPassword")) {
sfree (smtp_password);
smtp_password = strdup (value);
}
else if (0 == strcasecmp (key, "From")) {
sfree (email_from);
email_from = strdup (value);
}
else if (0 == strcasecmp (key, "Subject")) {
sfree (email_subject);
email_subject = strdup (value);
}
else {
return -1;
}
return 0;
} /* int notify_email_config (const char *, const char *) */
static int notify_email_notification (const notification_t *n,
user_data_t __attribute__((unused)) *user_data)
{
time_t tt;
struct tm timestamp_tm;
char timestamp_str[64];
char severity[32];
char subject[MAXSTRING];
char buf[4096] = "";
int buf_len = sizeof (buf);
int i;
ssnprintf (severity, sizeof (severity), "%s",
(n->severity == NOTIF_FAILURE) ? "FAILURE"
: ((n->severity == NOTIF_WARNING) ? "WARNING"
: ((n->severity == NOTIF_OKAY) ? "OKAY" : "UNKNOWN")));
ssnprintf (subject, sizeof (subject),
(email_subject == NULL) ? DEFAULT_SMTP_SUBJECT : email_subject,
severity, n->host);
tt = CDTIME_T_TO_TIME_T (n->time);
localtime_r (&tt, &timestamp_tm);
strftime (timestamp_str, sizeof (timestamp_str), "%Y-%m-%d %H:%M:%S",
&timestamp_tm);
timestamp_str[sizeof (timestamp_str) - 1] = '\0';
/* Let's make RFC822 message text with \r\n EOLs */
ssnprintf (buf, buf_len,
"MIME-Version: 1.0\r\n"
"Content-Type: text/plain;\r\n"
"Content-Transfer-Encoding: 8bit\r\n"
"Subject: %s\r\n"
"\r\n"
"%s - %s@%s\r\n"
"\r\n"
"Message: %s",
subject,
timestamp_str,
severity,
n->host,
n->message);
pthread_mutex_lock (&session_lock);
if (session == NULL) {
/* Initialization failed or we're in the process of shutting down. */
pthread_mutex_unlock (&session_lock);
return (-1);
}
if (!(message = smtp_add_message (session))) {
pthread_mutex_unlock (&session_lock);
ERROR ("notify_email plugin: cannot set SMTP message");
return (-1);
}
smtp_set_reverse_path (message, email_from);
smtp_set_header (message, "To", NULL, NULL);
smtp_set_message_str (message, buf);
for (i = 0; i < recipients_len; i++)
smtp_add_recipient (message, recipients[i]);
/* Initiate a connection to the SMTP server and transfer the message. */
if (!smtp_start_session (session)) {
char buf[MAXSTRING];
ERROR ("notify_email plugin: SMTP server problem: %s",
smtp_strerror (smtp_errno (), buf, sizeof buf));
pthread_mutex_unlock (&session_lock);
return (-1);
} else {
#if COLLECT_DEBUG
const smtp_status_t *status;
/* Report on the success or otherwise of the mail transfer. */
status = smtp_message_transfer_status (message);
DEBUG ("notify_email plugin: SMTP server report: %d %s",
status->code, (status->text != NULL) ? status->text : "\n");
#endif
smtp_enumerate_recipients (message, print_recipient_status, NULL);
}
pthread_mutex_unlock (&session_lock);
return (0);
} /* int notify_email_notification */
void module_register (void)
{
plugin_register_init ("notify_email", notify_email_init);
plugin_register_shutdown ("notify_email", notify_email_shutdown);
plugin_register_config ("notify_email", notify_email_config,
config_keys, config_keys_num);
plugin_register_notification ("notify_email", notify_email_notification,
/* user_data = */ NULL);
} /* void module_register (void) */
/* vim: set sw=2 sts=2 ts=8 et : */
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