summaryrefslogtreecommitdiff
path: root/lib/libalpm/be_package.c
blob: 7e90af719ebc76e35022ba61f88f086966edea89 (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
/*
 *  be_package.c : backend for packages
 *
 *  Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.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 <stdlib.h>
#include <string.h>
#include <errno.h>

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

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

/**
 * Open a package changelog for reading. Similar to fopen in functionality,
 * except that the returned 'file stream' is from an archive.
 * @param pkg the package (file) to read the changelog
 * @return a 'file stream' to the package changelog
 */
static void *_package_changelog_open(alpm_pkg_t *pkg)
{
	ASSERT(pkg != NULL, return NULL);

	struct archive *archive = NULL;
	struct archive_entry *entry;
	const char *pkgfile = pkg->origin_data.file;

	if((archive = archive_read_new()) == NULL) {
		RET_ERR(pkg->handle, ALPM_ERR_LIBARCHIVE, NULL);
	}

	archive_read_support_compression_all(archive);
	archive_read_support_format_all(archive);

	if(archive_read_open_filename(archive, pkgfile,
				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
		RET_ERR(pkg->handle, ALPM_ERR_PKG_OPEN, NULL);
	}

	while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
		const char *entry_name = archive_entry_pathname(entry);

		if(strcmp(entry_name, ".CHANGELOG") == 0) {
			return archive;
		}
	}
	/* we didn't find a changelog */
	archive_read_finish(archive);
	errno = ENOENT;

	return NULL;
}

/**
 * Read data from an open changelog 'file stream'. Similar to fread in
 * functionality, this function takes a buffer and amount of data to read.
 * @param ptr a buffer to fill with raw changelog data
 * @param size the size of the buffer
 * @param pkg the package that the changelog is being read from
 * @param fp a 'file stream' to the package changelog
 * @return the number of characters read, or 0 if there is no more data
 */
static size_t _package_changelog_read(void *ptr, size_t size,
		const alpm_pkg_t UNUSED *pkg, const void *fp)
{
	ssize_t sret = archive_read_data((struct archive *)fp, ptr, size);
	/* Report error (negative values) */
	if(sret < 0) {
		RET_ERR(pkg->handle, ALPM_ERR_LIBARCHIVE, 0);
	} else {
		return (size_t)sret;
	}
}

/**
 * Close a package changelog for reading. Similar to fclose in functionality,
 * except that the 'file stream' is from an archive.
 * @param pkg the package (file) that the changelog was read from
 * @param fp a 'file stream' to the package changelog
 * @return whether closing the package changelog stream was successful
 */
static int _package_changelog_close(const alpm_pkg_t UNUSED *pkg, void *fp)
{
	return archive_read_finish((struct archive *)fp);
}

/** Package file operations struct accessor. We implement this as a method
 * rather than a static struct as in be_files because we want to reuse the
 * majority of the default_pkg_ops struct and add only a few operations of
 * our own on top.
 */
static struct pkg_operations *get_file_pkg_ops(void)
{
	static struct pkg_operations file_pkg_ops;
	static int file_pkg_ops_initialized = 0;
	if(!file_pkg_ops_initialized) {
		file_pkg_ops = default_pkg_ops;
		file_pkg_ops.changelog_open  = _package_changelog_open;
		file_pkg_ops.changelog_read  = _package_changelog_read;
		file_pkg_ops.changelog_close = _package_changelog_close;
		file_pkg_ops_initialized = 1;
	}
	return &file_pkg_ops;
}

/**
 * Parses the package description file for a package into a alpm_pkg_t struct.
 * @param archive the archive to read from, pointed at the .PKGINFO entry
 * @param newpkg an empty alpm_pkg_t struct to fill with package info
 *
 * @return 0 on success, -1 on error
 */
static int parse_descfile(alpm_handle_t *handle, struct archive *a, alpm_pkg_t *newpkg)
{
	char *ptr = NULL;
	char *key = NULL;
	int ret, linenum = 0;
	struct archive_read_buffer buf;

	memset(&buf, 0, sizeof(buf));
	/* 512K for a line length seems reasonable */
	buf.max_line_size = 512 * 1024;

	/* loop until we reach EOF or other error */
	while((ret = _alpm_archive_fgets(a, &buf)) == ARCHIVE_OK) {
		size_t len = _alpm_strip_newline(buf.line);

		linenum++;
		if(len == 0 || buf.line[0] == '#') {
			continue;
		}
		ptr = buf.line;
		key = strsep(&ptr, "=");
		if(key == NULL || ptr == NULL) {
			_alpm_log(handle, ALPM_LOG_DEBUG, "%s: syntax error in description file line %d\n",
								newpkg->name ? newpkg->name : "error", linenum);
		} else {
			key = _alpm_strtrim(key);
			while(*ptr == ' ') ptr++;
			ptr = _alpm_strtrim(ptr);
			if(strcmp(key, "pkgname") == 0) {
				STRDUP(newpkg->name, ptr, return -1);
				newpkg->name_hash = _alpm_hash_sdbm(newpkg->name);
			} else if(strcmp(key, "pkgbase") == 0) {
				/* not used atm */
			} else if(strcmp(key, "pkgver") == 0) {
				STRDUP(newpkg->version, ptr, return -1);
			} else if(strcmp(key, "pkgdesc") == 0) {
				STRDUP(newpkg->desc, ptr, return -1);
			} else if(strcmp(key, "group") == 0) {
				newpkg->groups = alpm_list_add(newpkg->groups, strdup(ptr));
			} else if(strcmp(key, "url") == 0) {
				STRDUP(newpkg->url, ptr, return -1);
			} else if(strcmp(key, "license") == 0) {
				newpkg->licenses = alpm_list_add(newpkg->licenses, strdup(ptr));
			} else if(strcmp(key, "builddate") == 0) {
				newpkg->builddate = _alpm_parsedate(ptr);
			} else if(strcmp(key, "packager") == 0) {
				STRDUP(newpkg->packager, ptr, return -1);
			} else if(strcmp(key, "arch") == 0) {
				STRDUP(newpkg->arch, ptr, return -1);
			} else if(strcmp(key, "size") == 0) {
				/* size in the raw package is uncompressed (installed) size */
				newpkg->isize = atol(ptr);
			} else if(strcmp(key, "depend") == 0) {
				alpm_depend_t *dep = _alpm_splitdep(ptr);
				newpkg->depends = alpm_list_add(newpkg->depends, dep);
			} else if(strcmp(key, "optdepend") == 0) {
				newpkg->optdepends = alpm_list_add(newpkg->optdepends, strdup(ptr));
			} else if(strcmp(key, "conflict") == 0) {
				newpkg->conflicts = alpm_list_add(newpkg->conflicts, strdup(ptr));
			} else if(strcmp(key, "replaces") == 0) {
				newpkg->replaces = alpm_list_add(newpkg->replaces, strdup(ptr));
			} else if(strcmp(key, "provides") == 0) {
				newpkg->provides = alpm_list_add(newpkg->provides, strdup(ptr));
			} else if(strcmp(key, "backup") == 0) {
				alpm_backup_t *backup;
				CALLOC(backup, 1, sizeof(alpm_backup_t), return -1);
				STRDUP(backup->name, ptr, return -1);
				newpkg->backup = alpm_list_add(newpkg->backup, backup);
			} else if(strcmp(key, "force") == 0) {
				/* deprecated, skip it */
			} else if(strcmp(key, "makepkgopt") == 0) {
				/* not used atm */
			} else {
				_alpm_log(handle, ALPM_LOG_DEBUG, "%s: unknown key '%s' in description file line %d\n",
									newpkg->name ? newpkg->name : "error", key, linenum);
			}
		}
	}
	if(ret != ARCHIVE_EOF) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "error parsing package descfile\n");
		return -1;
	}

	return 0;
}

static void files_merge(alpm_file_t a[], alpm_file_t b[], alpm_file_t c[],
		size_t m, size_t n)
{
	size_t i = 0, j = 0, k = 0;
	while(i < m && j < n) {
		if(strcmp(a[i].name, b[j].name) < 0) {
			c[k++] = a[i++];
		} else {
			c[k++] = b[j++];
		}
	}
	while(i < m) {
		c[k++] = a[i++];
	}
	while(j < n) {
		c[k++] = b[j++];
	}
}

static alpm_file_t *files_msort(alpm_file_t *files, size_t n)
{
	alpm_file_t *work;
	size_t blocksize = 1;

	CALLOC(work, n, sizeof(alpm_file_t), return NULL);

	for(blocksize = 1; blocksize < n; blocksize *= 2) {
		size_t i, max_extent = 0;
		for(i = 0; i < n - blocksize; i += 2 * blocksize) {
			/* this limits our actual merge to the length of the array, since we will
			 * not likely be a perfect power of two. */
			size_t right_blocksize = blocksize;
			if(i + blocksize * 2 > n) {
				right_blocksize = n - i - blocksize;
			}
			files_merge(files + i, files + i + blocksize, work + i,
					blocksize, right_blocksize);
			max_extent = i + blocksize + right_blocksize;
		}
		/* ensure we only copy what we actually touched on this merge pass,
		 * no more, no less */
		memcpy(files, work, max_extent * sizeof(alpm_file_t));
	}
	free(work);
	return files;
}

/**
 * Load a package and create the corresponding alpm_pkg_t struct.
 * @param handle the context handle
 * @param pkgfile path to the package file
 * @param full whether to stop the load after metadata is read or continue
 *             through the full archive
 * @return An information filled alpm_pkg_t struct
 */
alpm_pkg_t *_alpm_pkg_load_internal(alpm_handle_t *handle, const char *pkgfile,
		int full, const char *md5sum, const char *base64_sig,
		alpm_siglevel_t level)
{
	int ret;
	int config = 0;
	struct archive *archive;
	struct archive_entry *entry;
	alpm_pkg_t *newpkg = NULL;
	struct stat st;
	size_t files_count = 0, files_size = 0;
	alpm_file_t *files = NULL;

	if(pkgfile == NULL || strlen(pkgfile) == 0) {
		RET_ERR(handle, ALPM_ERR_WRONG_ARGS, NULL);
	}

	/* attempt to stat the package file, ensure it exists */
	if(stat(pkgfile, &st) == 0) {
		newpkg = _alpm_pkg_new();
		if(newpkg == NULL) {
			RET_ERR(handle, ALPM_ERR_MEMORY, NULL);
		}
		newpkg->filename = strdup(pkgfile);
		newpkg->size = st.st_size;
	} else {
		/* couldn't stat the pkgfile, return an error */
		RET_ERR(handle, ALPM_ERR_PKG_OPEN, NULL);
	}

	/* first steps- validate the package file */
	_alpm_log(handle, ALPM_LOG_DEBUG, "md5sum: %s\n", md5sum);
	if(md5sum) {
		_alpm_log(handle, ALPM_LOG_DEBUG, "checking md5sum for %s\n", pkgfile);
		if(_alpm_test_md5sum(pkgfile, md5sum) != 0) {
			alpm_pkg_free(newpkg);
			RET_ERR(handle, ALPM_ERR_PKG_INVALID, NULL);
		}
	}

	_alpm_log(handle, ALPM_LOG_DEBUG, "base64_sig: %s\n", base64_sig);
	if(level & ALPM_SIG_PACKAGE &&
			_alpm_check_pgp_helper(handle, pkgfile, base64_sig,
				level & ALPM_SIG_PACKAGE_OPTIONAL, level & ALPM_SIG_PACKAGE_MARGINAL_OK,
				level & ALPM_SIG_PACKAGE_UNKNOWN_OK, ALPM_ERR_PKG_INVALID_SIG)) {
		_alpm_pkg_free(newpkg);
		return NULL;
	}

	/* next- try to create an archive object to read in the package */
	if((archive = archive_read_new()) == NULL) {
		alpm_pkg_free(newpkg);
		RET_ERR(handle, ALPM_ERR_LIBARCHIVE, NULL);
	}

	archive_read_support_compression_all(archive);
	archive_read_support_format_all(archive);

	if(archive_read_open_filename(archive, pkgfile,
				ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
		alpm_pkg_free(newpkg);
		RET_ERR(handle, ALPM_ERR_PKG_OPEN, NULL);
	}

	_alpm_log(handle, ALPM_LOG_DEBUG, "starting package load for %s\n", pkgfile);

	/* If full is false, only read through the archive until we find our needed
	 * metadata. If it is true, read through the entire archive, which serves
	 * as a verfication of integrity and allows us to create the filelist. */
	while((ret = archive_read_next_header(archive, &entry)) == ARCHIVE_OK) {
		const char *entry_name = archive_entry_pathname(entry);

		if(strcmp(entry_name, ".PKGINFO") == 0) {
			/* parse the info file */
			if(parse_descfile(handle, archive, newpkg) != 0) {
				_alpm_log(handle, ALPM_LOG_ERROR, _("could not parse package description file in %s\n"),
						pkgfile);
				goto pkg_invalid;
			}
			if(newpkg->name == NULL || strlen(newpkg->name) == 0) {
				_alpm_log(handle, ALPM_LOG_ERROR, _("missing package name in %s\n"), pkgfile);
				goto pkg_invalid;
			}
			if(newpkg->version == NULL || strlen(newpkg->version) == 0) {
				_alpm_log(handle, ALPM_LOG_ERROR, _("missing package version in %s\n"), pkgfile);
				goto pkg_invalid;
			}
			config = 1;
			continue;
		} else if(strcmp(entry_name,  ".INSTALL") == 0) {
			newpkg->scriptlet = 1;
		} else if(*entry_name == '.') {
			/* for now, ignore all files starting with '.' that haven't
			 * already been handled (for future possibilities) */
		} else if(full) {
			/* Keep track of all files for filelist generation */
			if(files_count >= files_size) {
				size_t old_size = files_size;
				if(files_size == 0) {
					files_size = 4;
				} else {
					files_size *= 2;
				}
				files = realloc(files, sizeof(alpm_file_t) * files_size);
				if(!files) {
					ALLOC_FAIL(sizeof(alpm_file_t) * files_size);
					goto error;
				}
				/* ensure all new memory is zeroed out, in both the initial
				 * allocation and later reallocs */
				memset(files + old_size, 0,
						sizeof(alpm_file_t) * (files_size - old_size));
			}
			STRDUP(files[files_count].name, entry_name, goto error);
			files[files_count].size = archive_entry_size(entry);
			files[files_count].mode = archive_entry_mode(entry);
			files_count++;
		}

		if(archive_read_data_skip(archive)) {
			_alpm_log(handle, ALPM_LOG_ERROR, _("error while reading package %s: %s\n"),
					pkgfile, archive_error_string(archive));
			handle->pm_errno = ALPM_ERR_LIBARCHIVE;
			goto error;
		}

		/* if we are not doing a full read, see if we have all we need */
		if(!full && config) {
			break;
		}
	}

	if(ret != ARCHIVE_EOF && ret != ARCHIVE_OK) { /* An error occured */
		_alpm_log(handle, ALPM_LOG_ERROR, _("error while reading package %s: %s\n"),
				pkgfile, archive_error_string(archive));
		handle->pm_errno = ALPM_ERR_LIBARCHIVE;
		goto error;
	}

	if(!config) {
		_alpm_log(handle, ALPM_LOG_ERROR, _("missing package metadata in %s\n"), pkgfile);
		goto pkg_invalid;
	}

	archive_read_finish(archive);

	/* internal fields for package struct */
	newpkg->origin = PKG_FROM_FILE;
	newpkg->origin_data.file = strdup(pkgfile);
	newpkg->ops = get_file_pkg_ops();
	newpkg->handle = handle;

	if(full) {
		/* attempt to hand back any memory we don't need */
		files = realloc(files, sizeof(alpm_file_t) * files_count);
		/* "checking for conflicts" requires a sorted list, ensure that here */
		_alpm_log(handle, ALPM_LOG_DEBUG, "sorting package filelist for %s\n", pkgfile);
		newpkg->files.files = files_msort(files, files_count);
		newpkg->files.count = files_count;
		newpkg->infolevel = INFRQ_ALL;
	} else {
		newpkg->infolevel = INFRQ_BASE | INFRQ_DESC;
	}

	return newpkg;

pkg_invalid:
	handle->pm_errno = ALPM_ERR_PKG_INVALID;
error:
	_alpm_pkg_free(newpkg);
	archive_read_finish(archive);

	return NULL;
}

int SYMEXPORT alpm_pkg_load(alpm_handle_t *handle, const char *filename, int full,
		alpm_siglevel_t level, alpm_pkg_t **pkg)
{
	CHECK_HANDLE(handle, return -1);
	ASSERT(pkg != NULL, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1));

	*pkg = _alpm_pkg_load_internal(handle, filename, full, NULL, NULL, level);
	if(*pkg == NULL) {
		/* pm_errno is set by pkg_load */
		return -1;
	}

	return 0;
}

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