summaryrefslogtreecommitdiffstats
path: root/journal-notify.c
blob: 73af0f53b1ac6633a1322ae64914c877aed67a54 (about) (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
/*
 * (C) 2014-2015 by Christian Hesse <mail@eworm.de>
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include "journal-notify.h"

const char * program = NULL;

const static char optstring[] = "aehi:m:nor:t:v";
const static struct option options_long[] = {
	/* name			has_arg			flag	val */
	{ "and",		no_argument,		NULL,	'a' },
	{ "extended-regex",	no_argument,		NULL,	'e' },
	{ "help",		no_argument,		NULL,	'h' },
	{ "icon",		required_argument,	NULL,	'i' },
	{ "match",		required_argument,	NULL,	'm' },
	{ "no-case",		no_argument,		NULL,	'n' },
	{ "or",			no_argument,		NULL,	'o' },
	{ "regex",		required_argument,	NULL,	'r' },
	{ "timeout",		required_argument,	NULL,	't' },
	{ "verbose",		no_argument,		NULL,	'v' },
	{ 0, 0, 0, 0 }
};

/*** notify ***/
int notify(const char * identifier, const char * message, uint8_t priority,
		const char * icon, int timeout) {
	NotifyNotification * notification;
	char * identifier_markup = NULL, * message_markup = NULL;
	uint8_t urgency;
	int rc = -1;

	if ((message_markup = g_markup_escape_text(message, -1)) == NULL)
		goto out10;
	if ((identifier_markup = g_markup_escape_text(identifier, -1)) == NULL)
		goto out10;

	switch(priority) {
		case 0:
		case 1:
		case 2:
			urgency = NOTIFY_URGENCY_CRITICAL;
			break;
		case 3:
		case 4:
			urgency = NOTIFY_URGENCY_NORMAL;
			break;
		default: /* this catches priority 5, 6 and 7 */
			urgency = NOTIFY_URGENCY_LOW;
			break;
	}

	notification =
#if NOTIFY_CHECK_VERSION(0, 7, 0)
		notify_notification_new(identifier, message, icon);
#else
		notify_notification_new(identifier, message, icon, NULL);
#endif

	if (notification == NULL)
		goto out10;

	/* NOTIFY_EXPIRES_NEVER == 0 */
	if (timeout >= 0)
		notify_notification_set_timeout(notification, timeout * 1000);

	notify_notification_set_urgency(notification, urgency);

	if (notify_notification_show(notification, NULL) == FALSE)
		goto out20;

	rc = 0;

out20:
	g_object_unref(G_OBJECT(notification));

out10:
	if (message_markup)
		free(message_markup);
	if (identifier_markup)
		free(identifier_markup);

	return rc;
}

/*** main ***/
int main(int argc, char **argv) {
	int i, rc = EXIT_FAILURE;
	uint8_t verbose = 0;

	uint8_t have_regex = 0;
	regex_t regex;
	int regex_flags = REG_NOSUB;

	sd_journal * journal;
	uint8_t old_entry = 1;
	const void * data;
	size_t length;

	char * identifier, * message;
	uint8_t priority;
	const char * icon = DEFAULTICON;
	int timeout = -1;

	program = argv[0];

	/* get command line options - part I
	 * just get -h (help), -e and -n (regex options) here */
	while ((i = getopt_long(argc, argv, optstring, options_long, NULL)) != -1) {
		switch (i) {
			case 'e':
				regex_flags |= REG_EXTENDED;
				break;
			case 'h':
				fprintf(stderr, "usage: %s [-e] [-h] [-i ICON] [-m MATCH] [-o -m MATCH] [-a -m MATCH] [-n] [-r REGEX] [-t SECONDS] [-vv]\n", program);
				return EXIT_SUCCESS;
			case 'n':
				regex_flags |= REG_ICASE;
				break;
			case 'v':
				verbose++;
				break;
		}
	}

	/* say hello */
	if (verbose > 0)
		printf("%s v%s (compiled: " __DATE__ ", " __TIME__ ")\n", program, VERSION);

	/* open journal */
	if ((rc = sd_journal_open(&journal, SD_JOURNAL_LOCAL_ONLY + SD_JOURNAL_SYSTEM)) < 0) {
		fprintf(stderr, "Failed to open journal: %s\n", strerror(-rc));
		goto out10;
	}

	/* seek to the end of the journal */
	if ((rc = sd_journal_seek_tail(journal)) < 0) {
		fprintf(stderr, "Failed to seek to the tail: %s\n", strerror(-rc));
		goto out20;
	}

	/* we are behind the last entry, so use previous one */
	if ((rc = sd_journal_previous(journal)) < 0) {
		fprintf(stderr, "Failed to iterate to previous entry: %s\n", strerror(-rc));
		goto out20;
	}

	/* reinitialize getopt() by resetting optind to 0 */
	optind = 0;

	/* get command line options - part II*/
	while ((i = getopt_long(argc, argv, optstring, options_long, NULL)) != -1) {
		switch (i) {
			case 'a':
				if (verbose > 1)
					printf("Adding logical AND to match...\n");

				if ((rc = sd_journal_add_conjunction(journal)) < 0) {
					fprintf(stderr, "Failed to add logical AND to match.\n");
					goto out30;
				}

				break;
			case 'i':
				icon = optarg;
				break;
			case 'm':
				if (verbose > 1)
					printf("Adding match '%s'...\n", optarg);

				if ((rc = sd_journal_add_match(journal, optarg, 0)) < 0) {
					fprintf(stderr, "Failed to add match '%s': %s\n", optarg, strerror(-rc));
					goto out30;
				}

				break;
			case 'o':
				if (verbose > 1)
					printf("Adding logical OR to match...\n");

				if ((rc = sd_journal_add_disjunction(journal)) < 0) {
					fprintf(stderr, "Failed to add logical OR to match.\n");
					goto out30;
				}

				break;
			case 'r':
				if (verbose > 1)
					printf("Adding regular expression '%s'...\n", optarg);

				if (have_regex > 0) {
					fprintf(stderr, "Only one regex allowed!\n");
					rc = EXIT_FAILURE;
					goto out30;
				}

				if ((rc = regcomp(&regex, optarg, regex_flags)) != 0) {
					fprintf(stderr, "Could not compile regex\n");
					goto out20;
				}
				have_regex++;

				break;
			case 't':
				timeout = atoi(optarg);
				if (verbose > 1)
					printf("Notifications will be displayed for %d seconds.\n", timeout);

				break;
		}
	}

	if (notify_init(program) == FALSE) {
		fprintf(stderr, "Failed to initialize notify.\n");
		rc = EXIT_FAILURE;
		goto out30;
	}

	while (1) {
		if ((rc = sd_journal_next(journal)) < 0) {
			fprintf(stderr, "Failed to iterate to next entry: %s\n", strerror(-rc));
			goto out40;
		} else if (rc == 0) {
			old_entry = 0;
			if (verbose > 2)
				printf("Waiting...\n");
			if ((rc = sd_journal_wait(journal, (uint64_t) -1)) < 0) {
				fprintf(stderr, "Failed to wait for changes: %s\n", strerror(-rc));
				goto out40;
			}
			continue;
		}

		/* Looks like there is a but in libsystemd journal handling
		 * that jumps to wrong entries. Just skip old entries until we
		 * have a recent ones. */
		if (old_entry > 0) {
			fprintf(stderr, "This is an old entry, ignoring.\n");
			continue;
		}

		/* get MESSAGE field */
		if ((rc = sd_journal_get_data(journal, "MESSAGE", &data, &length)) < 0) {
			fprintf(stderr, "Failed to read message field: %s\n", strerror(-rc));
			continue;
		}
		message = malloc(length - 8 + 1);
		memcpy(message, data + 8, length - 8);
		message[length - 8] = 0;

		/* get SYSLOG_IDENTIFIER field */
		if ((rc = sd_journal_get_data(journal, "SYSLOG_IDENTIFIER", &data, &length)) < 0) {
			fprintf(stderr, "Failed to read syslog identifier field: %s\n", strerror(-rc));
			continue;
		}
		identifier = malloc(length - 18 + 1);
		memcpy(identifier, data + 18, length - 18);
		identifier[length - 18] = 0;

		/* get PRIORITY field */
		if ((rc = sd_journal_get_data(journal, "PRIORITY", &data, &length)) < 0) {
			fprintf(stderr, "Failed to read syslog identifier field: %s\n", strerror(-rc));
			continue;
		}
		priority = atoi(data + 9);

		if (verbose > 2)
			printf("Received message from journal: %s\n", message);

		/* show notification */
		if (have_regex == 0 || regexec(&regex, message, 0, NULL, 0) == 0) {
			for (i = 0; i < 3; i++) {
				if (verbose > 0)
					printf("Showing notification: %s: %s\n", identifier, message);

				if ((rc = notify(identifier, message, priority, icon, timeout)) == 0)
					break;

				fprintf(stderr, "Failed to show notification, reinitializing libnotify.\n");
				notify_uninit();
				usleep(500 * 1000);
				if (notify_init(program) == FALSE) {
					fprintf(stderr, "Failed to initialize notify.\n");
					rc = EXIT_FAILURE;
				}
			}
			if (rc != 0)
				goto out40;
		}

		free(identifier);
		free(message);
	}

	rc = EXIT_SUCCESS;

out40:
	notify_uninit();

out30:
	if (have_regex > 0)
		regfree(&regex);

out20:
	sd_journal_close(journal);

out10:
	return rc;
}

// vim: set syntax=c: