summaryrefslogtreecommitdiff
path: root/lib/libalpm/util.c
blob: 1e94190ae7ff3069fb62b6371bb27c31cc646d46 (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
696
697
698
699
700
701
702
703
704
705
/*
 *  util.c
 *
 *  Copyright (c) 2002-2007 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 <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>

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

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

#ifndef HAVE_STRVERSCMP
/* GNU's strverscmp() function, taken from glibc 2.3.2 sources
 */

/* Compare strings while treating digits characters numerically.
   Copyright (C) 1997, 2002 Free Software Foundation, Inc.
   Contributed by Jean-François Bignolles <bignolle@ecoledoc.ibp.fr>, 1997.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
*/

/* states: S_N: normal, S_I: comparing integral part, S_F: comparing
           fractionnal parts, S_Z: idem but with leading Zeroes only */
#define  S_N    0x0
#define  S_I    0x4
#define  S_F    0x8
#define  S_Z    0xC

/* result_type: CMP: return diff; LEN: compare using len_diff/diff */
#define  CMP    2
#define  LEN    3

/* Compare S1 and S2 as strings holding indices/version numbers,
   returning less than, equal to or greater than zero if S1 is less than,
   equal to or greater than S2 (for more info, see the texinfo doc).
*/

int strverscmp (s1, s2)
     const char *s1;
     const char *s2;
{
  const unsigned char *p1 = (const unsigned char *) s1;
  const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;
  int state;
  int diff;

  /* Symbol(s)    0       [1-9]   others  (padding)
     Transition   (10) 0  (01) d  (00) x  (11) -   */
  static const unsigned int next_state[] =
  {
      /* state    x    d    0    - */
      /* S_N */  S_N, S_I, S_Z, S_N,
      /* S_I */  S_N, S_I, S_I, S_I,
      /* S_F */  S_N, S_F, S_F, S_F,
      /* S_Z */  S_N, S_F, S_Z, S_Z
  };

  static const int result_type[] =
  {
      /* state   x/x  x/d  x/0  x/-  d/x  d/d  d/0  d/-
                 0/x  0/d  0/0  0/-  -/x  -/d  -/0  -/- */

      /* S_N */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
      /* S_I */  CMP, -1,  -1,  CMP, +1,  LEN, LEN, CMP,
                 +1,  LEN, LEN, CMP, CMP, CMP, CMP, CMP,
      /* S_F */  CMP, CMP, CMP, CMP, CMP, LEN, CMP, CMP,
                 CMP, CMP, CMP, CMP, CMP, CMP, CMP, CMP,
      /* S_Z */  CMP, +1,  +1,  CMP, -1,  CMP, CMP, CMP,
                 -1,  CMP, CMP, CMP
  };

  if (p1 == p2)
    return 0;

  c1 = *p1++;
  c2 = *p2++;
  /* Hint: '0' is a digit too.  */
  state = S_N | ((c1 == '0') + (isdigit (c1) != 0));

  while ((diff = c1 - c2) == 0 && c1 != '\0')
    {
      state = next_state[state];
      c1 = *p1++;
      c2 = *p2++;
      state |= (c1 == '0') + (isdigit (c1) != 0);
    }

  state = result_type[state << 2 | (((c2 == '0') + (isdigit (c2) != 0)))];

  switch (state)
  {
    case CMP:
      return diff;

    case LEN:
      while (isdigit (*p1++))
	if (!isdigit (*p2++))
	  return 1;

      return isdigit (*p2) ? -1 : diff;

    default:
      return state;
  }
}
#endif

#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)
{
	char *orig, *str, *ptr;
	char full[PATH_MAX] = "";
	mode_t oldmask;

	oldmask = umask(0000);

	orig = strdup(path);
	str = orig;
	while((ptr = strsep(&str, "/"))) {
		if(strlen(ptr)) {
			struct stat buf;

			strcat(full, "/");
			strcat(full, ptr);
			if(stat(full, &buf)) {
				if(mkdir(full, mode)) {
					FREE(orig);
					umask(oldmask);
					_alpm_log(PM_LOG_ERROR, _("failed to make path '%s' : %s\n"),
										path, strerror(errno));
					return(1);
				}
			}
		}
	}
	FREE(orig);
	umask(oldmask);
	return(0);
}

int _alpm_copyfile(const char *src, const char *dest)
{
	FILE *in, *out;
	size_t len;
	char buf[4097];

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

	/* do the actual file copy */
	while((len = fread(buf, 1, 4096, in))) {
		fwrite(buf, 1, len, out);
	}
	fclose(in);

	/* 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 */
		fclose(out);
		return(1);
	}

	fclose(out);
	return(0);
}

/* 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);
}

/* Helper function for _alpm_strreplace */
static void _strnadd(char **str, const char *append, unsigned int count)
{
	if(*str) {
		*str = realloc(*str, strlen(*str) + count + 1);
	} else {
		*str = calloc(count + 1, sizeof(char));
	}

	strncat(*str, append, count);
}

/* Replace all occurances of 'needle' with 'replace' in 'str', returning
 * a new string (must be free'd) */
char *_alpm_strreplace(const char *str, const char *needle, const char *replace)
{
	const char *p, *q;
	p = q = str;

	char *newstr = NULL;
	unsigned int needlesz = strlen(needle),
							 replacesz = strlen(replace);

	while (1) {
		q = strstr(p, needle);
		if(!q) { /* not found */
			if(*p) {
				/* add the rest of 'p' */
				_strnadd(&newstr, p, strlen(p));
			}
			break;
		} else { /* found match */
			if(q > p){
				/* add chars between this occurance and last occurance, if any */
				_strnadd(&newstr, p, q - p);
			}
			_strnadd(&newstr, replace, replacesz);
			p = q + needlesz;
		}
	}

	return newstr;
}


/* Create a lock file */
int _alpm_lckmk()
{
	int fd, count = 0;
	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);

	while((fd = open(file, O_WRONLY | O_CREAT | O_EXCL, 0000)) == -1 && errno == EACCES) {
		if(++count < 1) {
			sleep(1);
		}	else {
			return(-1);
		}
	}

	FREE(dir);

	return(fd > 0 ? fd : -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 */

int _alpm_unpack(const char *archive, const char *prefix, const char *fn)
{
	int ret = 1;
	mode_t oldmask;
	struct archive *_archive;
	struct archive_entry *entry;
	char expath[PATH_MAX];

	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);
	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_mode(entry, 0644);
		} else if(S_ISDIR(st->st_mode)) {
			archive_entry_set_mode(entry, 0755);
		}

		if (fn && strcmp(fn, entryname)) {
			if (archive_read_data_skip(_archive) != ARCHIVE_OK) {
				ret = 1;
				goto cleanup;
			}
			continue;
		}
		ret = 0;
		snprintf(expath, PATH_MAX, "%s/%s", prefix, entryname);
		archive_entry_set_pathname(entry, expath);

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

	if(usesyslog) {
		vsyslog(LOG_WARNING, fmt, args);
	}

	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_ldconfig(const char *root)
{
	char line[PATH_MAX];
	struct stat buf;

	snprintf(line, PATH_MAX, "%setc/ld.so.conf", root);
	if(stat(line, &buf) == 0) {
		snprintf(line, PATH_MAX, "%ssbin/ldconfig", root);
		if(stat(line, &buf) == 0) {
			char cmd[PATH_MAX];
			snprintf(cmd, PATH_MAX, "%s -r %s", line, root);
			system(cmd);
		}
	}

	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 package file in an alpm cachedir.
 * @param filename name of package file to find
 * @return malloced path of file, NULL if not found
 */
char *_alpm_filecache_find(const char* filename)
{
	struct stat buf;
	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(stat(path, &buf) == 0) {
			/* TODO maybe check to make sure it is readable? */
			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_get_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_get_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: */