summaryrefslogtreecommitdiff
path: root/lib/libalpm/util.c
blob: c5485925e603af838a63fc14c50a5ac501d55b80 (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
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
/*
 *  util.c
 *
 *  Copyright (c) 2006-2009 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
 *  Copyright (c) 2005 by Aurelien Foret <orelien@chez.com>
 *  Copyright (c) 2005 by Christian Hamar <krics@linuxforum.hu>
 *  Copyright (c) 2006 by David Kimpe <dnaku@frugalware.org>
 *  Copyright (c) 2005, 2006 by Miklos Vajna <vmiklos@frugalware.org>
 *
 *  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, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <dirent.h>
#include <time.h>
#include <syslog.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>

/* libarchive */
#include <archive.h>
#include <archive_entry.h>

/* libalpm */
#include "util.h"
#include "log.h"
#include "package.h"
#include "alpm.h"
#include "alpm_list.h"
#include "md5.h"
#include "handle.h"

#ifndef HAVE_STRSEP
/* This is a replacement for strsep which is not portable (missing on Solaris).
 * Copyright (c) 2001 by François Gouget <fgouget_at_codeweavers.com> */
char* strsep(char** str, const char* delims)
{
	char* token;

	if (*str==NULL) {
		/* No more tokens */
		return NULL;
	}

	token=*str;
	while (**str!='\0') {
		if (strchr(delims,**str)!=NULL) {
			**str='\0';
			(*str)++;
			return token;
		}
		(*str)++;
	}
	/* There is no other token */
	*str=NULL;
	return token;
}
#endif

int _alpm_makepath(const char *path)
{
	return(_alpm_makepath_mode(path, 0755));
}

/* does the same thing as 'mkdir -p' */
int _alpm_makepath_mode(const char *path, mode_t mode)
{
	/* A bit of pointer hell here. Descriptions:
	 * orig - a copy of path so we can safely butcher it with strsep
	 * str - the current position in the path string (after the delimiter)
	 * ptr - the original position of str after calling strsep
	 * incr - incrementally generated path for use in stat/mkdir call
	 */
	char *orig, *str, *ptr, *incr;
	mode_t oldmask = umask(0000);
	int ret = 0;

	orig = strdup(path);
	incr = calloc(strlen(orig) + 1, sizeof(char));
	str = orig;
	while((ptr = strsep(&str, "/"))) {
		if(strlen(ptr)) {
			/* we have another path component- append the newest component to
			 * existing string and create one more level of dir structure */
			strcat(incr, "/");
			strcat(incr, ptr);
			if(access(incr, F_OK)) {
				if(mkdir(incr, mode)) {
					ret = 1;
					break;
				}
			}
		}
	}
	free(orig);
	free(incr);
	umask(oldmask);
	return(ret);
}

#define CPBUFSIZE 8 * 1024

int _alpm_copyfile(const char *src, const char *dest)
{
	FILE *in, *out;
	size_t len;
	char *buf;
	int ret = 0;

	in = fopen(src, "rb");
	if(in == NULL) {
		return(1);
	}
	out = fopen(dest, "wb");
	if(out == NULL) {
		fclose(in);
		return(1);
	}

	CALLOC(buf, (size_t)CPBUFSIZE, (size_t)1, ret = 1; goto cleanup;);

	/* do the actual file copy */
	while((len = fread(buf, 1, CPBUFSIZE, in))) {
		fwrite(buf, 1, len, out);
	}

	/* chmod dest to permissions of src, as long as it is not a symlink */
	struct stat statbuf;
	if(!stat(src, &statbuf)) {
		if(! S_ISLNK(statbuf.st_mode)) {
			fchmod(fileno(out), statbuf.st_mode);
		}
	} else {
		/* stat was unsuccessful */
		ret = 1;
	}

cleanup:
	fclose(in);
	fclose(out);
	FREE(buf);
	return(ret);
}

/* Trim whitespace and newlines from a string
*/
char *_alpm_strtrim(char *str)
{
	char *pch = str;

	if(*str == '\0') {
		/* string is empty, so we're done. */
		return(str);
	}

	while(isspace((int)*pch)) {
		pch++;
	}
	if(pch != str) {
		memmove(str, pch, (strlen(pch) + 1));
	}

	/* check if there wasn't anything but whitespace in the string. */
	if(*str == '\0') {
		return(str);
	}

	pch = (str + (strlen(str) - 1));
	while(isspace((int)*pch)) {
		pch--;
	}
	*++pch = '\0';

	return(str);
}

/* Create a lock file */
int _alpm_lckmk()
{
	int fd;
	char *dir, *ptr;
	const char *file = alpm_option_get_lockfile();

	/* create the dir of the lockfile first */
	dir = strdup(file);
	ptr = strrchr(dir, '/');
	if(ptr) {
		*ptr = '\0';
	}
	_alpm_makepath(dir);
	FREE(dir);

	while((fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0000)) == -1
			&& errno == EINTR);
	if(fd > 0) {
		FILE *f = fdopen(fd, "w");
		fprintf(f, "%ld\n", (long)getpid());
		fflush(f);
		fsync(fd);
		fclose(f);
		return(fd);
	}
	return(-1);
}

/* Remove a lock file */
int _alpm_lckrm()
{
	const char *file = alpm_option_get_lockfile();
	if(unlink(file) == -1 && errno != ENOENT) {
		return(-1);
	}
	return(0);
}

/* Compression functions */

/**
 * @brief Unpack a specific file or all files in an archive.
 *
 * @param archive  the archive to unpack
 * @param prefix   where to extract the files
 * @param fn       a file within the archive to unpack or NULL for all
 * @return 0 on success, 1 on failure
 */
int _alpm_unpack(const char *archive, const char *prefix, const char *fn)
{
	int ret = 0;
	mode_t oldmask;
	struct archive *_archive;
	struct archive_entry *entry;
	char cwd[PATH_MAX];
	int restore_cwd = 0;

	ALPM_LOG_FUNC;

	if((_archive = archive_read_new()) == NULL)
		RET_ERR(PM_ERR_LIBARCHIVE, 1);

	archive_read_support_compression_all(_archive);
	archive_read_support_format_all(_archive);

	if(archive_read_open_filename(_archive, archive,
				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
		_alpm_log(PM_LOG_ERROR, _("could not open %s: %s\n"), archive,
				archive_error_string(_archive));
		RET_ERR(PM_ERR_PKG_OPEN, 1);
	}

	oldmask = umask(0022);

	/* save the cwd so we can restore it later */
	if(getcwd(cwd, PATH_MAX) == NULL) {
		_alpm_log(PM_LOG_ERROR, _("could not get current working directory\n"));
	} else {
		restore_cwd = 1;
	}

	/* just in case our cwd was removed in the upgrade operation */
	if(chdir(prefix) != 0) {
		_alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), prefix, strerror(errno));
		ret = 1;
		goto cleanup;
	}

	while(archive_read_next_header(_archive, &entry) == ARCHIVE_OK) {
		const struct stat *st;
		const char *entryname; /* the name of the file in the archive */

		st = archive_entry_stat(entry);
		entryname = archive_entry_pathname(entry);
		
		if(S_ISREG(st->st_mode)) {
			archive_entry_set_perm(entry, 0644);
		} else if(S_ISDIR(st->st_mode)) {
			archive_entry_set_perm(entry, 0755);
		}

		/* If a specific file was requested skip entries that don't match. */
		if (fn && strcmp(fn, entryname)) {
			_alpm_log(PM_LOG_DEBUG, "skipping: %s\n", entryname);
			if (archive_read_data_skip(_archive) != ARCHIVE_OK) {
				ret = 1;
				goto cleanup;
			}
			continue;
		}

		/* Extract the archive entry. */
		int readret = archive_read_extract(_archive, entry, 0);
		if(readret == ARCHIVE_WARN) {
			/* operation succeeded but a non-critical error was encountered */
			_alpm_log(PM_LOG_DEBUG, "warning extracting %s (%s)\n",
					entryname, archive_error_string(_archive));
		} else if(readret != ARCHIVE_OK) {
			_alpm_log(PM_LOG_ERROR, _("could not extract %s (%s)\n"),
					entryname, archive_error_string(_archive));
			ret = 1;
			goto cleanup;
		}

		if(fn) {
			break;
		}
	}

cleanup:
	umask(oldmask);
	archive_read_finish(_archive);
	if(restore_cwd) {
		chdir(cwd);
	}
	return(ret);
}

/* does the same thing as 'rm -rf' */
int _alpm_rmrf(const char *path)
{
	int errflag = 0;
	struct dirent *dp;
	DIR *dirp;
	char name[PATH_MAX];
	struct stat st;

	if(_alpm_lstat(path, &st) == 0) {
		if(!S_ISDIR(st.st_mode)) {
			if(!unlink(path)) {
				return(0);
			} else {
				if(errno == ENOENT) {
					return(0);
				} else {
					return(1);
				}
			}
		} else {
			if((dirp = opendir(path)) == (DIR *)-1) {
				return(1);
			}
			for(dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
				if(dp->d_ino) {
					sprintf(name, "%s/%s", path, dp->d_name);
					if(strcmp(dp->d_name, "..") && strcmp(dp->d_name, ".")) {
						errflag += _alpm_rmrf(name);
					}
				}
			}
			closedir(dirp);
			if(rmdir(path)) {
				errflag++;
			}
		}
		return(errflag);
	}
	return(0);
}

int _alpm_logaction(int usesyslog, FILE *f, const char *fmt, va_list args)
{
	int ret = 0;

	if(usesyslog) {
		/* we can't use a va_list more than once, so we need to copy it
		 * so we can use the original when calling vfprintf below. */
		va_list args_syslog;
		va_copy(args_syslog, args);
		vsyslog(LOG_WARNING, fmt, args_syslog);
		va_end(args_syslog);
	}

	if(f) {
		time_t t;
		struct tm *tm;

		t = time(NULL);
		tm = localtime(&t);

		/* Use ISO-8601 date format */
		fprintf(f, "[%04d-%02d-%02d %02d:%02d] ",
						tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
						tm->tm_hour, tm->tm_min);
		ret = vfprintf(f, fmt, args);
		fflush(f);
	}

	return(ret);
}

int _alpm_run_chroot(const char *root, const char *cmd)
{
	char cwd[PATH_MAX];
	pid_t pid;
	int restore_cwd = 0;
	int retval = 0;

	ALPM_LOG_FUNC;

	/* save the cwd so we can restore it later */
	if(getcwd(cwd, PATH_MAX) == NULL) {
		_alpm_log(PM_LOG_ERROR, _("could not get current working directory\n"));
	} else {
		restore_cwd = 1;
	}

	/* just in case our cwd was removed in the upgrade operation */
	if(chdir(root) != 0) {
		_alpm_log(PM_LOG_ERROR, _("could not change directory to %s (%s)\n"), root, strerror(errno));
		goto cleanup;
	}

	_alpm_log(PM_LOG_DEBUG, "executing \"%s\" under chroot \"%s\"\n", cmd, root);

	/* Flush open fds before fork() to avoid cloning buffers */
	fflush(NULL);

	/* fork- parent and child each have seperate code blocks below */
	pid = fork();
	if(pid == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not fork a new process (%s)\n"), strerror(errno));
		retval = 1;
		goto cleanup;
	}

	if(pid == 0) {
		FILE *pipe;
		/* this code runs for the child only (the actual chroot/exec) */
		_alpm_log(PM_LOG_DEBUG, "chrooting in %s\n", root);
		if(chroot(root) != 0) {
			_alpm_log(PM_LOG_ERROR, _("could not change the root directory (%s)\n"),
					strerror(errno));
			exit(1);
		}
		if(chdir("/") != 0) {
			_alpm_log(PM_LOG_ERROR, _("could not change directory to / (%s)\n"),
					strerror(errno));
			exit(1);
		}
		umask(0022);
		pipe = popen(cmd, "r");
		if(!pipe) {
			_alpm_log(PM_LOG_ERROR, _("call to popen failed (%s)\n"),
					strerror(errno));
			exit(1);
		}
		while(!feof(pipe)) {
			char line[PATH_MAX];
			if(fgets(line, PATH_MAX, pipe) == NULL)
				break;
			alpm_logaction("%s", line);
			EVENT(handle->trans, PM_TRANS_EVT_SCRIPTLET_INFO, line, NULL);
		}
		retval = pclose(pipe);
		exit(WEXITSTATUS(retval));
	} else {
		/* this code runs for the parent only (wait on the child) */
		pid_t retpid;
		int status;
		while((retpid = waitpid(pid, &status, 0)) == -1 && errno == EINTR);
		if(retpid == -1) {
			_alpm_log(PM_LOG_ERROR, _("call to waitpid failed (%s)\n"),
			          strerror(errno));
			retval = 1;
			goto cleanup;
		} else {
			/* check the return status, make sure it is 0 (success) */
			if(WIFEXITED(status)) {
				_alpm_log(PM_LOG_DEBUG, "call to waitpid succeeded\n");
				if(WEXITSTATUS(status) != 0) {
					_alpm_log(PM_LOG_ERROR, _("command failed to execute correctly\n"));
					retval = 1;
				}
			}
		}
	}

cleanup:
	if(restore_cwd) {
		chdir(cwd);
	}

	return(retval);
}

int _alpm_ldconfig(const char *root)
{
	char line[PATH_MAX];

	_alpm_log(PM_LOG_DEBUG, "running ldconfig\n");

	snprintf(line, PATH_MAX, "%setc/ld.so.conf", root);
	if(access(line, F_OK) == 0) {
		snprintf(line, PATH_MAX, "%ssbin/ldconfig", root);
		if(access(line, X_OK) == 0) {
			_alpm_run_chroot(root, "/sbin/ldconfig");
		}
	}

	return(0);
}

/* Helper function for comparing strings using the
 * alpm "compare func" signature */
int _alpm_str_cmp(const void *s1, const void *s2)
{
	return(strcmp(s1, s2));
}

/** Find a filename in a registered alpm cachedir.
 * @param filename name of file to find
 * @return malloced path of file, NULL if not found
 */
char *_alpm_filecache_find(const char* filename)
{
	char path[PATH_MAX];
	char *retpath;
	alpm_list_t *i;

	/* Loop through the cache dirs until we find a matching file */
	for(i = alpm_option_get_cachedirs(); i; i = alpm_list_next(i)) {
		snprintf(path, PATH_MAX, "%s%s", (char*)alpm_list_getdata(i),
				filename);
		if(access(path, R_OK) == 0) {
			retpath = strdup(path);
			_alpm_log(PM_LOG_DEBUG, "found cached pkg: %s\n", retpath);
			return(retpath);
		}
	}
	/* package wasn't found in any cachedir */
	return(NULL);
}

/** Check the alpm cachedirs for existance and find a writable one.
 * If no valid cache directory can be found, use /tmp.
 * @return pointer to a writable cache directory.
 */
const char *_alpm_filecache_setup(void)
{
	struct stat buf;
	alpm_list_t *i, *tmp;
	char *cachedir;

	/* Loop through the cache dirs until we find a writeable dir */
	for(i = alpm_option_get_cachedirs(); i; i = alpm_list_next(i)) {
		cachedir = alpm_list_getdata(i);
		if(stat(cachedir, &buf) != 0) {
			/* cache directory does not exist.... try creating it */
			_alpm_log(PM_LOG_WARNING, _("no %s cache exists, creating...\n"),
					cachedir);
			if(_alpm_makepath(cachedir) == 0) {
				_alpm_log(PM_LOG_DEBUG, "using cachedir: %s\n", cachedir);
				return(cachedir);
			}
		} else if(S_ISDIR(buf.st_mode) && (buf.st_mode & S_IWUSR)) {
			_alpm_log(PM_LOG_DEBUG, "using cachedir: %s\n", cachedir);
			return(cachedir);
		}
	}

	/* we didn't find a valid cache directory. use /tmp. */
	tmp = alpm_list_add(NULL, strdup("/tmp/"));
	alpm_option_set_cachedirs(tmp);
	_alpm_log(PM_LOG_DEBUG, "using cachedir: %s", "/tmp/\n");
	_alpm_log(PM_LOG_WARNING, _("couldn't create package cache, using /tmp instead\n"));
	return(alpm_list_getdata(tmp));
}

/** lstat wrapper that treats /path/dirsymlink/ the same as /path/dirsymlink.
 * Linux lstat follows POSIX semantics and still performs a dereference on
 * the first, and for uses of lstat in libalpm this is not what we want.
 * @param path path to file to lstat
 * @param buf structure to fill with stat information
 * @return the return code from lstat
 */
int _alpm_lstat(const char *path, struct stat *buf)
{
	int ret;
	char *newpath = strdup(path);
	int len = strlen(newpath);

	/* strip the trailing slash if one exists */
	if(len != 0 && newpath[len - 1] == '/') {
			newpath[len - 1] = '\0';
	}

	ret = lstat(newpath, buf);

	FREE(newpath);
	return(ret);
}

/** Get the md5 sum of file.
 * @param filename name of the file
 * @return the checksum on success, NULL on error
 * @addtogroup alpm_misc
 */
char SYMEXPORT *alpm_compute_md5sum(const char *filename)
{
	unsigned char output[16];
	char *md5sum;
	int ret, i;

	ALPM_LOG_FUNC;

	ASSERT(filename != NULL, return(NULL));

	/* allocate 32 chars plus 1 for null */
	md5sum = calloc(33, sizeof(char));
	ret = md5_file(filename, output);

	if (ret > 0) {
		RET_ERR(PM_ERR_NOT_A_FILE, NULL);
	}

	/* Convert the result to something readable */
	for (i = 0; i < 16; i++) {
		/* sprintf is acceptable here because we know our output */
		sprintf(md5sum +(i * 2), "%02x", output[i]);
	}
	md5sum[32] = '\0';

	_alpm_log(PM_LOG_DEBUG, "md5(%s) = %s\n", filename, md5sum);
	return(md5sum);
}

int _alpm_test_md5sum(const char *filepath, const char *md5sum)
{
	char *md5sum2;
	int ret;

	md5sum2 = alpm_compute_md5sum(filepath);

	if(md5sum == NULL || md5sum2 == NULL) {
		ret = -1;
	} else if(strcmp(md5sum, md5sum2) != 0) {
		ret = 1;
	} else {
		ret = 0;
	}

	FREE(md5sum2);
	return(ret);
}

char *_alpm_archive_fgets(char *line, size_t size, struct archive *a)
{
	/* for now, just read one char at a time until we get to a
	 * '\n' char. we can optimize this later with an internal
	 * buffer. */
	/* leave room for zero terminator */
	char *last = line + size - 1;
	char *i;

	for(i = line; i < last; i++) {
		int ret = archive_read_data(a, i, 1);
		/* special check for first read- if null, return null,
		 * this indicates EOF */
		if(i == line && (ret <= 0 || *i == '\0')) {
			return(NULL);
		}
		/* check if read value was null or newline */
		if(ret <= 0 || *i == '\0' || *i == '\n') {
			last = i + 1;
			break;
		}
	}

	/* always null terminate the buffer */
	*last = '\0';

	return(line);
}

/* vim: set ts=2 sw=2 noet: */