1 /**
2 * collectd - src/notify_email.c
3 * Copyright (C) 2008 Oleg King
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Oleg King <king2 at kaluga.ru>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
27 #include <auth-client.h>
28 #include <libesmtp.h>
30 #define MAXSTRING 256
32 static const char *config_keys[] =
33 {
34 "SMTPServer",
35 "SMTPPort",
36 "SMTPUser",
37 "SMTPPassword",
38 "From",
39 "Recipient",
40 "Subject"
41 };
42 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
44 static char **recipients;
45 static int recipients_len = 0;
47 static smtp_session_t session;
48 static smtp_message_t message;
49 static auth_context_t authctx = NULL;
51 static int smtp_port = 25;
52 static char *smtp_host = NULL;
53 static char *smtp_user = NULL;
54 static char *smtp_password = NULL;
55 static char *email_from = NULL;
56 static char *email_subject = NULL;
58 #define DEFAULT_SMTP_HOST "localhost"
59 #define DEFAULT_SMTP_FROM "root@localhost"
60 #define DEFAULT_SMTP_SUBJECT "Collectd notify: %s@%s"
62 /* Callback to get username and password */
63 static int authinteract (auth_client_request_t request, char **result,
64 int fields, void __attribute__((unused)) *arg)
65 {
66 int i;
67 for (i = 0; i < fields; i++)
68 {
69 if (request[i].flags & AUTH_USER)
70 result[i] = smtp_user;
71 else if (request[i].flags & AUTH_PASS)
72 result[i] = smtp_password;
73 else
74 return 0;
75 }
76 return 1;
77 } /* int authinteract */
79 /* Callback to print the recipient status */
80 static void print_recipient_status (smtp_recipient_t recipient,
81 const char *mailbox, void __attribute__((unused)) *arg)
82 {
83 const smtp_status_t *status;
85 status = smtp_recipient_status (recipient);
86 if (status->text[strlen(status->text) - 2] == '\r')
87 status->text[strlen(status->text) - 2] = 0;
88 INFO ("notify_email: notify sent to %s: %d %s", mailbox, status->code,
89 status->text);
90 } /* void print_recipient_status */
92 /* Callback to monitor SMTP activity */
93 static void monitor_cb (const char *buf, int buflen, int writing,
94 void __attribute__((unused)) *arg)
95 {
96 char log_str[MAXSTRING];
98 sstrncpy (log_str, buf, sizeof (log_str));
99 if (buflen > 2)
100 log_str[buflen - 2] = 0; /* replace \n with \0 */
102 if (writing == SMTP_CB_HEADERS) {
103 DEBUG ("notify_email plugin: SMTP --- H: %s", log_str);
104 return;
105 }
106 DEBUG (writing
107 ? "notify_email plugin: SMTP >>> C: %s"
108 : "notify_email plugin: SMTP <<< S: %s",
109 log_str);
110 } /* void monitor_cb */
112 static int notify_email_init (void)
113 {
114 char server[MAXSTRING];
116 auth_client_init();
117 if (!(session = smtp_create_session ())) {
118 ERROR ("notify_email plugin: cannot create SMTP session");
119 return (-1);
120 }
122 smtp_set_monitorcb (session, monitor_cb, NULL, 1);
123 smtp_set_hostname (session, hostname_g);
124 ssnprintf(server, sizeof (server), "%s:%i",
125 (smtp_host == NULL) ? DEFAULT_SMTP_HOST : smtp_host,
126 smtp_port);
127 smtp_set_server (session, server);
129 if (smtp_user && smtp_password) {
130 authctx = auth_create_context ();
131 auth_set_mechanism_flags (authctx, AUTH_PLUGIN_PLAIN, 0);
132 auth_set_interact_cb (authctx, authinteract, NULL);
133 }
135 if ( !smtp_auth_set_context (session, authctx)) {
136 ERROR ("notify_email plugin: cannot set SMTP auth context");
137 return (-1);
138 }
140 return (0);
141 } /* int notify_email_init */
143 static int notify_email_shutdown (void)
144 {
145 smtp_destroy_session (session);
146 auth_destroy_context (authctx);
147 auth_client_exit();
148 return (0);
149 } /* int notify_email_shutdown */
151 static int notify_email_config (const char *key, const char *value)
152 {
153 if (strcasecmp (key, "Recipient") == 0)
154 {
155 char **tmp;
157 tmp = (char **) realloc ((void *) recipients, (recipients_len + 1) * sizeof (char *));
158 if (tmp == NULL) {
159 ERROR ("notify_email: realloc failed.");
160 return (-1);
161 }
163 recipients = tmp;
164 recipients[recipients_len] = strdup (value);
165 if (recipients[recipients_len] == NULL) {
166 ERROR ("notify_email: strdup failed.");
167 return (-1);
168 }
169 recipients_len++;
170 }
171 else if (0 == strcasecmp (key, "SMTPServer")) {
172 sfree (smtp_host);
173 smtp_host = strdup (value);
174 }
175 else if (0 == strcasecmp (key, "SMTPPort")) {
176 int port_tmp = atoi (value);
177 if (port_tmp < 1 || port_tmp > 65535)
178 {
179 WARNING ("notify_email plugin: Invalid SMTP port: %i", port_tmp);
180 return (1);
181 }
182 smtp_port = port_tmp;
183 }
184 else if (0 == strcasecmp (key, "SMTPUser")) {
185 sfree (smtp_user);
186 smtp_user = strdup (value);
187 }
188 else if (0 == strcasecmp (key, "SMTPPassword")) {
189 sfree (smtp_password);
190 smtp_password = strdup (value);
191 }
192 else if (0 == strcasecmp (key, "From")) {
193 sfree (email_from);
194 email_from = strdup (value);
195 }
196 else if (0 == strcasecmp (key, "Subject")) {
197 sfree (email_subject);
198 email_subject = strdup (value);
199 }
200 else {
201 return -1;
202 }
203 return 0;
204 } /* int notify_email_config (const char *, const char *) */
206 static int notify_email_notification (const notification_t *n,
207 user_data_t __attribute__((unused)) *user_data)
208 {
209 smtp_recipient_t recipient;
211 struct tm timestamp_tm;
212 char timestamp_str[64];
214 char severity[32];
215 char subject[MAXSTRING];
217 char buf[4096] = "";
218 int buf_len = sizeof (buf);
219 int i;
221 ssnprintf (severity, sizeof (severity), "%s",
222 (n->severity == NOTIF_FAILURE) ? "FAILURE"
223 : ((n->severity == NOTIF_WARNING) ? "WARNING"
224 : ((n->severity == NOTIF_OKAY) ? "OKAY" : "UNKNOWN")));
226 ssnprintf (subject, sizeof (subject),
227 (email_subject == NULL) ? DEFAULT_SMTP_SUBJECT : email_subject,
228 severity, n->host);
230 localtime_r (&n->time, ×tamp_tm);
231 strftime (timestamp_str, sizeof (timestamp_str), "%Y-%m-%d %H:%M:%S",
232 ×tamp_tm);
233 timestamp_str[sizeof (timestamp_str) - 1] = '\0';
235 /* Let's make RFC822 message text with \r\n EOLs */
236 ssnprintf (buf, buf_len,
237 "MIME-Version: 1.0\r\n"
238 "Content-Type: text/plain;\r\n"
239 "Content-Transfer-Encoding: 8bit\r\n"
240 "Subject: %s\r\n"
241 "\r\n"
242 "%s - %s@%s\r\n"
243 "\r\n"
244 "Message: %s",
245 subject,
246 timestamp_str,
247 severity,
248 n->host,
249 n->message);
251 if (!(message = smtp_add_message (session))) {
252 ERROR ("notify_email plugin: cannot set SMTP message");
253 return (-1);
254 }
255 smtp_set_reverse_path (message, email_from);
256 smtp_set_header (message, "To", NULL, NULL);
257 smtp_set_message_str (message, buf);
259 for (i = 0; i < recipients_len; i++)
260 recipient = smtp_add_recipient (message, recipients[i]);
262 /* Initiate a connection to the SMTP server and transfer the message. */
263 if (!smtp_start_session (session)) {
264 char buf[MAXSTRING];
265 ERROR ("notify_email plugin: SMTP server problem: %s",
266 smtp_strerror (smtp_errno (), buf, sizeof buf));
267 return (-1);
268 } else {
269 const smtp_status_t *status;
270 /* Report on the success or otherwise of the mail transfer. */
271 status = smtp_message_transfer_status (message);
272 DEBUG ("notify_email plugin: SMTP server report: %d %s",
273 status->code, (status->text != NULL) ? status->text : "\n");
274 smtp_enumerate_recipients (message, print_recipient_status, NULL);
275 }
277 return (0);
278 } /* int notify_email_notification */
280 void module_register (void)
281 {
282 plugin_register_init ("notify_email", notify_email_init);
283 plugin_register_shutdown ("notify_email", notify_email_shutdown);
284 plugin_register_config ("notify_email", notify_email_config,
285 config_keys, config_keys_num);
286 plugin_register_notification ("notify_email", notify_email_notification,
287 /* user_data = */ NULL);
288 } /* void module_register (void) */
290 /* vim: set sw=2 sts=2 ts=8 et : */