aboutsummaryrefslogtreecommitdiffhomepage
path: root/notmuch-insert.c
blob: 6752fc8de25531a161cd6d119518c2d9cc338cf5 (plain)
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
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/* notmuch - Not much of an email program, (just index and search)
 *
 * Copyright © 2013 Peter Wang
 *
 * Based in part on notmuch-deliver
 * Copyright © 2010 Ali Polatel
 *
 * 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 3 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, see http://www.gnu.org/licenses/ .
 *
 * Author: Peter Wang <novalazy@gmail.com>
 */

#include "notmuch-client.h"
#include "tag-util.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

static volatile sig_atomic_t interrupted;

static void
handle_sigint (unused (int sig))
{
    static char msg[] = "Stopping...         \n";

    /* This write is "opportunistic", so it's okay to ignore the
     * result.  It is not required for correctness, and if it does
     * fail or produce a short write, we want to get out of the signal
     * handler as quickly as possible, not retry it. */
    IGNORE_RESULT (write (2, msg, sizeof (msg) - 1));
    interrupted = 1;
}

/* Like gethostname but guarantees that a null-terminated hostname is
 * returned, even if it has to make one up. Invalid characters are
 * substituted such that the hostname can be used within a filename.
 */
static void
safe_gethostname (char *hostname, size_t len)
{
    char *p;

    if (gethostname (hostname, len) == -1) {
	strncpy (hostname, "unknown", len);
    }
    hostname[len - 1] = '\0';

    for (p = hostname; *p != '\0'; p++) {
	if (*p == '/' || *p == ':')
	    *p = '_';
    }
}

/* Call fsync() on a directory path. */
static notmuch_bool_t
sync_dir (const char *dir)
{
    notmuch_bool_t ret;
    int fd;

    fd = open (dir, O_RDONLY);
    if (fd == -1) {
	fprintf (stderr, "Error: open() dir failed: %s\n", strerror (errno));
	return FALSE;
    }
    ret = (fsync (fd) == 0);
    if (! ret) {
	fprintf (stderr, "Error: fsync() dir failed: %s\n", strerror (errno));
    }
    close (fd);
    return ret;
}

/* Check the specified folder name does not contain a directory
 * component ".." to prevent writes outside of the Maildir hierarchy. */
static notmuch_bool_t
check_folder_name (const char *folder)
{
    const char *p = folder;

    for (;;) {
	if ((p[0] == '.') && (p[1] == '.') && (p[2] == '\0' || p[2] == '/'))
	    return FALSE;
	p = strchr (p, '/');
	if (!p)
	    return TRUE;
	p++;
    }
}

/* Make the given directory, succeeding if it already exists. */
static notmuch_bool_t
make_directory (char *path, int mode)
{
    notmuch_bool_t ret;
    char *slash;

    if (mkdir (path, mode) != 0)
	return (errno == EEXIST);

    /* Sync the parent directory for durability. */
    ret = TRUE;
    slash = strrchr (path, '/');
    if (slash) {
	*slash = '\0';
	ret = sync_dir (path);
	*slash = '/';
    }
    return ret;
}

/* Make the given directory including its parent directories as necessary.
 * Return TRUE on success, FALSE on error. */
static notmuch_bool_t
make_directory_and_parents (char *path, int mode)
{
    struct stat st;
    char *start;
    char *end;
    notmuch_bool_t ret;

    /* First check the common case: directory already exists. */
    if (stat (path, &st) == 0)
	return S_ISDIR (st.st_mode) ? TRUE : FALSE;

    for (start = path; *start != '\0'; start = end + 1) {
	/* start points to the first unprocessed character.
	 * Find the next slash from start onwards. */
	end = strchr (start, '/');

	/* If there are no more slashes then all the parent directories
	 * have been made.  Now attempt to make the whole path. */
	if (end == NULL)
	    return make_directory (path, mode);

	/* Make the path up to the next slash, unless the current
	 * directory component is actually empty. */
	if (end > start) {
	    *end = '\0';
	    ret = make_directory (path, mode);
	    *end = '/';
	    if (! ret)
		return FALSE;
	}
    }

    return TRUE;
}

/* Create the given maildir folder, i.e. dir and its subdirectories
 * 'cur', 'new', 'tmp'. */
static notmuch_bool_t
maildir_create_folder (void *ctx, const char *dir)
{
    const int mode = 0700;
    char *subdir;
    char *tail;

    /* Create 'cur' directory, including parent directories. */
    subdir = talloc_asprintf (ctx, "%s/cur", dir);
    if (! subdir) {
	fprintf (stderr, "Out of memory.\n");
	return FALSE;
    }
    if (! make_directory_and_parents (subdir, mode))
	return FALSE;

    tail = subdir + strlen (subdir) - 3;

    /* Create 'new' directory. */
    strcpy (tail, "new");
    if (! make_directory (subdir, mode))
	return FALSE;

    /* Create 'tmp' directory. */
    strcpy (tail, "tmp");
    if (! make_directory (subdir, mode))
	return FALSE;

    talloc_free (subdir);
    return TRUE;
}

/* Open a unique file in the 'tmp' sub-directory of dir.
 * Returns the file descriptor on success, or -1 on failure.
 * On success, file paths for the message in the 'tmp' and 'new'
 * directories are returned via tmppath and newpath,
 * and the path of the 'new' directory itself in newdir. */
static int
maildir_open_tmp_file (void *ctx, const char *dir,
		       char **tmppath, char **newpath, char **newdir)
{
    pid_t pid;
    char hostname[256];
    struct timeval tv;
    char *filename;
    int fd = -1;

    /* We follow the Dovecot file name generation algorithm. */
    pid = getpid ();
    safe_gethostname (hostname, sizeof (hostname));
    do {
	gettimeofday (&tv, NULL);
	filename = talloc_asprintf (ctx, "%ld.M%ldP%d.%s",
				    tv.tv_sec, tv.tv_usec, pid, hostname);
	if (! filename) {
	    fprintf (stderr, "Out of memory\n");
	    return -1;
	}

	*tmppath = talloc_asprintf (ctx, "%s/tmp/%s", dir, filename);
	if (! *tmppath) {
	    fprintf (stderr, "Out of memory\n");
	    return -1;
	}

	fd = open (*tmppath, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0600);
    } while (fd == -1 && errno == EEXIST);

    if (fd == -1) {
	fprintf (stderr, "Error: opening %s: %s\n", *tmppath, strerror (errno));
	return -1;
    }

    *newdir = talloc_asprintf (ctx, "%s/new", dir);
    *newpath = talloc_asprintf (ctx, "%s/new/%s", dir, filename);
    if (! *newdir || ! *newpath) {
	fprintf (stderr, "Out of memory\n");
	close (fd);
	unlink (*tmppath);
	return -1;
    }

    talloc_free (filename);

    return fd;
}

/* Copy the contents of standard input (fdin) into fdout.
 * Returns TRUE if a non-empty file was written successfully.
 * Otherwise, return FALSE. */
static notmuch_bool_t
copy_stdin (int fdin, int fdout)
{
    notmuch_bool_t empty = TRUE;

    while (! interrupted) {
	ssize_t remain;
	char buf[4096];
	char *p;

	remain = read (fdin, buf, sizeof (buf));
	if (remain == 0)
	    break;
	if (remain < 0) {
	    if (errno == EINTR)
		continue;
	    fprintf (stderr, "Error: reading from standard input: %s\n",
		     strerror (errno));
	    return FALSE;
	}

	p = buf;
	do {
	    ssize_t written = write (fdout, p, remain);
	    if (written < 0 && errno == EINTR)
		continue;
	    if (written <= 0) {
		fprintf (stderr, "Error: writing to temporary file: %s",
			 strerror (errno));
		return FALSE;
	    }
	    p += written;
	    remain -= written;
	    empty = FALSE;
	} while (remain > 0);
    }

    return (!interrupted && !empty);
}

/* Add the specified message file to the notmuch database, applying tags.
 * The file is renamed to encode notmuch tags as maildir flags. */
static void
add_file_to_database (notmuch_database_t *notmuch, const char *path,
		      tag_op_list_t *tag_ops, notmuch_bool_t synchronize_flags)
{
    notmuch_message_t *message;
    notmuch_status_t status;

    status = notmuch_database_add_message (notmuch, path, &message);
    switch (status) {
    case NOTMUCH_STATUS_SUCCESS:
    case NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID:
	break;
    default:
    case NOTMUCH_STATUS_FILE_NOT_EMAIL:
    case NOTMUCH_STATUS_READ_ONLY_DATABASE:
    case NOTMUCH_STATUS_XAPIAN_EXCEPTION:
    case NOTMUCH_STATUS_OUT_OF_MEMORY:
    case NOTMUCH_STATUS_FILE_ERROR:
    case NOTMUCH_STATUS_NULL_POINTER:
    case NOTMUCH_STATUS_TAG_TOO_LONG:
    case NOTMUCH_STATUS_UNBALANCED_FREEZE_THAW:
    case NOTMUCH_STATUS_UNBALANCED_ATOMIC:
    case NOTMUCH_STATUS_LAST_STATUS:
	fprintf (stderr, "Error: failed to add `%s' to notmuch database: %s\n",
		 path, notmuch_status_to_string (status));
	return;
    }

    if (status == NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID) {
	/* Don't change tags of an existing message. */
	if (synchronize_flags) {
	    status = notmuch_message_tags_to_maildir_flags (message);
	    if (status != NOTMUCH_STATUS_SUCCESS)
		fprintf (stderr, "Error: failed to sync tags to maildir flags\n");
	}
    } else {
	tag_op_flag_t flags = synchronize_flags ? TAG_FLAG_MAILDIR_SYNC : 0;

	tag_op_list_apply (message, tag_ops, flags);
    }

    notmuch_message_destroy (message);
}

static notmuch_bool_t
insert_message (void *ctx, notmuch_database_t *notmuch, int fdin,
		const char *dir, tag_op_list_t *tag_ops,
		notmuch_bool_t synchronize_flags)
{
    char *tmppath;
    char *newpath;
    char *newdir;
    int fdout;
    char *cleanup_path;

    fdout = maildir_open_tmp_file (ctx, dir, &tmppath, &newpath, &newdir);
    if (fdout < 0)
	return FALSE;

    cleanup_path = tmppath;

    if (! copy_stdin (fdin, fdout))
	goto FAIL;

    if (fsync (fdout) != 0) {
	fprintf (stderr, "Error: fsync failed: %s\n", strerror (errno));
	goto FAIL;
    }

    close (fdout);
    fdout = -1;

    /* Atomically move the new message file from the Maildir 'tmp' directory
     * to the 'new' directory.  We follow the Dovecot recommendation to
     * simply use rename() instead of link() and unlink().
     * See also: http://wiki.dovecot.org/MailboxFormat/Maildir#Mail_delivery
     */
    if (rename (tmppath, newpath) != 0) {
	fprintf (stderr, "Error: rename() failed: %s\n", strerror (errno));
	goto FAIL;
    }

    cleanup_path = newpath;

    if (! sync_dir (newdir))
	goto FAIL;

    /* Even if adding the message to the notmuch database fails,
     * the message is on disk and we consider the delivery completed. */
    add_file_to_database (notmuch, newpath, tag_ops, synchronize_flags);

    return TRUE;

  FAIL:
    if (fdout >= 0)
	close (fdout);
    unlink (cleanup_path);
    return FALSE;
}

int
notmuch_insert_command (notmuch_config_t *config, int argc, char *argv[])
{
    notmuch_database_t *notmuch;
    struct sigaction action;
    const char *db_path;
    const char **new_tags;
    size_t new_tags_length;
    tag_op_list_t *tag_ops;
    char *query_string = NULL;
    const char *folder = NULL;
    notmuch_bool_t create_folder = FALSE;
    notmuch_bool_t synchronize_flags;
    const char *maildir;
    int opt_index;
    unsigned int i;
    notmuch_bool_t ret;

    notmuch_opt_desc_t options[] = {
	{ NOTMUCH_OPT_STRING, &folder, "folder", 0, 0 },
	{ NOTMUCH_OPT_BOOLEAN, &create_folder, "create-folder", 0, 0 },
	{ NOTMUCH_OPT_END, 0, 0, 0, 0 }
    };

    opt_index = parse_arguments (argc, argv, options, 1);
    if (opt_index < 0)
	return EXIT_FAILURE;

    db_path = notmuch_config_get_database_path (config);
    new_tags = notmuch_config_get_new_tags (config, &new_tags_length);
    synchronize_flags = notmuch_config_get_maildir_synchronize_flags (config);

    tag_ops = tag_op_list_create (config);
    if (tag_ops == NULL) {
	fprintf (stderr, "Out of memory.\n");
	return EXIT_FAILURE;
    }
    for (i = 0; i < new_tags_length; i++) {
	const char *error_msg;

	error_msg = illegal_tag (new_tags[i], FALSE);
	if (error_msg) {
	    fprintf (stderr, "Error: tag '%s' in new.tags: %s\n",
		     new_tags[i],  error_msg);
	    return EXIT_FAILURE;
	}

	if (tag_op_list_append (tag_ops, new_tags[i], FALSE))
	    return EXIT_FAILURE;
    }

    if (parse_tag_command_line (config, argc - opt_index, argv + opt_index,
				&query_string, tag_ops))
	return EXIT_FAILURE;

    if (*query_string != '\0') {
	fprintf (stderr, "Error: unexpected query string: %s\n", query_string);
	return EXIT_FAILURE;
    }

    if (folder == NULL) {
	maildir = db_path;
    } else {
	if (! check_folder_name (folder)) {
	    fprintf (stderr, "Error: bad folder name: %s\n", folder);
	    return EXIT_FAILURE;
	}
	maildir = talloc_asprintf (config, "%s/%s", db_path, folder);
	if (! maildir) {
	    fprintf (stderr, "Out of memory\n");
	    return EXIT_FAILURE;
	}
	if (create_folder && ! maildir_create_folder (config, maildir)) {
	    fprintf (stderr, "Error: creating maildir %s: %s\n",
		     maildir, strerror (errno));
	    return EXIT_FAILURE;
	}
    }

    /* Setup our handler for SIGINT. We do not set SA_RESTART so that copying
     * from standard input may be interrupted. */
    memset (&action, 0, sizeof (struct sigaction));
    action.sa_handler = handle_sigint;
    sigemptyset (&action.sa_mask);
    action.sa_flags = 0;
    sigaction (SIGINT, &action, NULL);

    if (notmuch_database_open (notmuch_config_get_database_path (config),
			       NOTMUCH_DATABASE_MODE_READ_WRITE, &notmuch))
	return EXIT_FAILURE;

    ret = insert_message (config, notmuch, STDIN_FILENO, maildir, tag_ops,
			  synchronize_flags);

    notmuch_database_destroy (notmuch);

    return ret ? EXIT_SUCCESS : EXIT_FAILURE;
}