1/* vi: set sw=4 ts=4: */
2/*
3 *  mini dpkg implementation for busybox.
4 *  this is not meant as a replacement for dpkg
5 *
6 *  written by glenn mcgrath with the help of others
7 *  copyright (c) 2001 by glenn mcgrath
8 *
9 *  parts of the version comparison code is plucked from the real dpkg
10 *  application which is licensed GPLv2 and
11 *  copyright (c) 1995 Ian Jackson <ian@chiark.greenend.org.uk>
12 *
13 *  started life as a busybox implementation of udpkg
14 *
15 * licensed under gplv2 or later, see file license in this tarball for details.
16 */
17
18/*
19 * known difference between busybox dpkg and the official dpkg that i don't
20 * consider important, its worth keeping a note of differences anyway, just to
21 * make it easier to maintain.
22 *  - the first value for the confflile: field isnt placed on a new line.
23 *  - when installing a package the status: field is placed at the end of the
24 *      section, rather than just after the package: field.
25 *
26 * bugs that need to be fixed
27 *  - (unknown, please let me know when you find any)
28 *
29 */
30
31#include "libbb.h"
32#include <fnmatch.h>
33#include "unarchive.h"
34
35/* note: if you vary hash_prime sizes be aware,
36 * 1) tweaking these will have a big effect on how much memory this program uses.
37 * 2) for computational efficiency these hash tables should be at least 20%
38 *    larger than the maximum number of elements stored in it.
39 * 3) all _hash_prime's must be a prime number or chaos is assured, if your looking
40 *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
41 * 4) if you go bigger than 15 bits you may get into trouble (untested) as its
42 *    sometimes cast to an unsigned, if you go to 16 bit you will overlap
43 *    int's and chaos is assured, 16381 is the max prime for 14 bit field
44 */
45
46/* NAME_HASH_PRIME, Stores package names and versions,
47 * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
48 * as there a lot of duplicate version numbers */
49#define NAME_HASH_PRIME 16381
50
51/* PACKAGE_HASH_PRIME, Maximum number of unique packages,
52 * It must not be smaller than STATUS_HASH_PRIME,
53 * Currently only packages from status_hashtable are stored in here, but in
54 * future this may be used to store packages not only from a status file,
55 * but an available_hashtable, and even multiple packages files.
56 * Package can be stored more than once if they have different versions.
57 * e.g. The same package may have different versions in the status file
58 *      and available file */
59#define PACKAGE_HASH_PRIME 10007
60typedef struct edge_s {
61	unsigned operator:4; /* was:3 */
62	unsigned type:4;
63	unsigned name:16; /* was:14 */
64	unsigned version:16; /* was:14 */
65} edge_t;
66
67typedef struct common_node_s {
68	unsigned name:16; /* was:14 */
69	unsigned version:16; /* was:14 */
70	unsigned num_of_edges:16; /* was:14 */
71	edge_t **edge;
72} common_node_t;
73
74/* Currently it doesnt store packages that have state-status of not-installed
75 * So it only really has to be the size of the maximum number of packages
76 * likely to be installed at any one time, so there is a bit of leeway here */
77#define STATUS_HASH_PRIME 8191
78typedef struct status_node_s {
79	unsigned package:16; /* was:14 */       /* has to fit PACKAGE_HASH_PRIME */
80	unsigned status:16; /* was:14 */        /* has to fit STATUS_HASH_PRIME */
81} status_node_t;
82
83
84/* Globals */
85struct globals {
86	char          *name_hashtable[NAME_HASH_PRIME + 1];
87	common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
88	status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
89};
90#define G (*ptr_to_globals)
91#define name_hashtable    (G.name_hashtable   )
92#define package_hashtable (G.package_hashtable)
93#define status_hashtable  (G.status_hashtable )
94#define INIT_G() do { \
95	SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
96} while (0)
97
98
99/* Even numbers are for 'extras', like ored dependencies or null */
100enum edge_type_e {
101	EDGE_NULL = 0,
102	EDGE_PRE_DEPENDS = 1,
103	EDGE_OR_PRE_DEPENDS = 2,
104	EDGE_DEPENDS = 3,
105	EDGE_OR_DEPENDS = 4,
106	EDGE_REPLACES = 5,
107	EDGE_PROVIDES = 7,
108	EDGE_CONFLICTS = 9,
109	EDGE_SUGGESTS = 11,
110	EDGE_RECOMMENDS = 13,
111	EDGE_ENHANCES = 15
112};
113enum operator_e {
114	VER_NULL = 0,
115	VER_EQUAL = 1,
116	VER_LESS = 2,
117	VER_LESS_EQUAL = 3,
118	VER_MORE = 4,
119	VER_MORE_EQUAL = 5,
120	VER_ANY = 6
121};
122
123typedef struct deb_file_s {
124	char *control_file;
125	char *filename;
126	unsigned package:16; /* was:14 */
127} deb_file_t;
128
129
130static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
131{
132	unsigned long hash_num = key[0];
133	int len = strlen(key);
134	int i;
135
136	/* Maybe i should have uses a "proper" hashing algorithm here instead
137	 * of making one up myself, seems to be working ok though. */
138	for (i = 1; i < len; i++) {
139		/* shifts the ascii based value and adds it to previous value
140		 * shift amount is mod 24 because long int is 32 bit and data
141		 * to be shifted is 8, don't want to shift data to where it has
142		 * no effect */
143		hash_num += (key[i] + key[i-1]) << ((key[i] * i) % 24);
144	}
145	*start = (unsigned) hash_num % hash_prime;
146	*decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
147}
148
149/* this adds the key to the hash table */
150static int search_name_hashtable(const char *key)
151{
152	unsigned probe_address;
153	unsigned probe_decrement;
154
155	make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
156	while (name_hashtable[probe_address] != NULL) {
157		if (strcmp(name_hashtable[probe_address], key) == 0) {
158			return probe_address;
159		}
160		probe_address -= probe_decrement;
161		if ((int)probe_address < 0) {
162			probe_address += NAME_HASH_PRIME;
163		}
164	}
165	name_hashtable[probe_address] = xstrdup(key);
166	return probe_address;
167}
168
169/* this DOESNT add the key to the hashtable
170 * TODO make it consistent with search_name_hashtable
171 */
172static unsigned search_status_hashtable(const char *key)
173{
174	unsigned probe_address;
175	unsigned probe_decrement;
176
177	make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
178	while (status_hashtable[probe_address] != NULL) {
179		if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
180			break;
181		}
182		probe_address -= probe_decrement;
183		if ((int)probe_address < 0) {
184			probe_address += STATUS_HASH_PRIME;
185		}
186	}
187	return probe_address;
188}
189
190static int order(char x)
191{
192	return (x == '~' ? -1
193		: x == '\0' ? 0
194		: isdigit(x) ? 0
195		: isalpha(x) ? x
196		: (unsigned char)x + 256
197	);
198}
199
200/* This code is taken from dpkg and modified slightly to work with busybox */
201static int version_compare_part(const char *val, const char *ref)
202{
203	if (!val) val = "";
204	if (!ref) ref = "";
205
206	while (*val || *ref) {
207		int first_diff;
208
209		while ((*val && !isdigit(*val)) || (*ref && !isdigit(*ref))) {
210			int vc = order(*val);
211			int rc = order(*ref);
212			if (vc != rc)
213				return vc - rc;
214			val++;
215			ref++;
216		}
217
218		while (*val == '0')
219			val++;
220		while (*ref == '0')
221			ref++;
222
223		first_diff = 0;
224		while (isdigit(*val) && isdigit(*ref)) {
225			if (first_diff == 0)
226				first_diff = *val - *ref;
227			val++;
228			ref++;
229		}
230		if (isdigit(*val))
231			return 1;
232		if (isdigit(*ref))
233			return -1;
234		if (first_diff)
235			return first_diff;
236	}
237	return 0;
238}
239
240/* if ver1 < ver2 return -1,
241 * if ver1 = ver2 return 0,
242 * if ver1 > ver2 return 1,
243 */
244static int version_compare(const unsigned ver1, const unsigned ver2)
245{
246	char *ch_ver1 = name_hashtable[ver1];
247	char *ch_ver2 = name_hashtable[ver2];
248	unsigned epoch1 = 0, epoch2 = 0;
249	char *colon;
250	char *deb_ver1, *deb_ver2;
251	char *upstream_ver1;
252	char *upstream_ver2;
253	int result;
254
255	/* Compare epoch */
256	colon = strchr(ch_ver1, ':');
257	if (colon) {
258		epoch1 = atoi(ch_ver1);
259		ch_ver1 = colon + 1;
260	}
261	colon = strchr(ch_ver2, ':');
262	if (colon) {
263		epoch2 = atoi(ch_ver2);
264		ch_ver2 = colon + 1;
265	}
266	if (epoch1 < epoch2) {
267		return -1;
268	}
269	if (epoch1 > epoch2) {
270		return 1;
271	}
272
273	/* Compare upstream version */
274	upstream_ver1 = xstrdup(ch_ver1);
275	upstream_ver2 = xstrdup(ch_ver2);
276
277	/* Chop off debian version, and store for later use */
278	deb_ver1 = strrchr(upstream_ver1, '-');
279	deb_ver2 = strrchr(upstream_ver2, '-');
280	if (deb_ver1) {
281		*deb_ver1++ = '\0';
282	}
283	if (deb_ver2) {
284		*deb_ver2++ = '\0';
285	}
286	result = version_compare_part(upstream_ver1, upstream_ver2);
287	if (result == 0) {
288		/* Compare debian versions */
289		result = version_compare_part(deb_ver1, deb_ver2);
290	}
291
292	free(upstream_ver1);
293	free(upstream_ver2);
294	return result;
295}
296
297static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
298{
299	const int version_result = version_compare(version1, version2);
300	switch (operator) {
301	case VER_ANY:
302		return TRUE;
303	case VER_EQUAL:
304		return (version_result == 0);
305	case VER_LESS:
306		return (version_result < 0);
307	case VER_LESS_EQUAL:
308		return (version_result <= 0);
309	case VER_MORE:
310		return (version_result > 0);
311	case VER_MORE_EQUAL:
312		return (version_result >= 0);
313	}
314	return FALSE;
315}
316
317static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
318{
319	unsigned probe_address;
320	unsigned probe_decrement;
321
322	make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
323	while (package_hashtable[probe_address] != NULL) {
324		if (package_hashtable[probe_address]->name == name) {
325			if (operator == VER_ANY) {
326				return probe_address;
327			}
328			if (test_version(package_hashtable[probe_address]->version, version, operator)) {
329				return probe_address;
330			}
331		}
332		probe_address -= probe_decrement;
333		if ((int)probe_address < 0) {
334			probe_address += PACKAGE_HASH_PRIME;
335		}
336	}
337	return probe_address;
338}
339
340/*
341 * This function searches through the entire package_hashtable looking
342 * for a package which provides "needle". It returns the index into
343 * the package_hashtable for the providing package.
344 *
345 * needle is the index into name_hashtable of the package we are
346 * looking for.
347 *
348 * start_at is the index in the package_hashtable to start looking
349 * at. If start_at is -1 then start at the beginning. This is to allow
350 * for repeated searches since more than one package might provide
351 * needle.
352 *
353 * FIXME: I don't think this is very efficient, but I thought I'd keep
354 * it simple for now until it proves to be a problem.
355 */
356static int search_for_provides(int needle, int start_at)
357{
358	int i, j;
359	common_node_t *p;
360	for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
361		p = package_hashtable[i];
362		if (p == NULL)
363			continue;
364		for (j = 0; j < p->num_of_edges; j++)
365			if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
366				return i;
367	}
368	return -1;
369}
370
371/*
372 * Add an edge to a node
373 */
374static void add_edge_to_node(common_node_t *node, edge_t *edge)
375{
376	node->edge = xrealloc_vector(node->edge, 2, node->num_of_edges);
377	node->edge[node->num_of_edges++] = edge;
378}
379
380/*
381 * Create one new node and one new edge for every dependency.
382 *
383 * Dependencies which contain multiple alternatives are represented as
384 * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
385 * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
386 * the OR edge contains the full dependency string while the version
387 * field contains the number of EDGE nodes which follow as part of
388 * this alternative.
389 */
390static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
391{
392	char *line = xstrdup(whole_line);
393	char *line2;
394	char *line_ptr1 = NULL;
395	char *line_ptr2 = NULL;
396	char *field;
397	char *field2;
398	char *version;
399	edge_t *edge;
400	edge_t *or_edge;
401	int offset_ch;
402
403	field = strtok_r(line, ",", &line_ptr1);
404	do {
405		/* skip leading spaces */
406		field += strspn(field, " ");
407		line2 = xstrdup(field);
408		field2 = strtok_r(line2, "|", &line_ptr2);
409		or_edge = NULL;
410		if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
411		 && (strcmp(field, field2) != 0)
412		) {
413			or_edge = xzalloc(sizeof(edge_t));
414			or_edge->type = edge_type + 1;
415			or_edge->name = search_name_hashtable(field);
416			//or_edge->version = 0; // tracks the number of alternatives
417			add_edge_to_node(parent_node, or_edge);
418		}
419
420		do {
421			edge = xmalloc(sizeof(edge_t));
422			edge->type = edge_type;
423
424			/* Skip any extra leading spaces */
425			field2 += strspn(field2, " ");
426
427			/* Get dependency version info */
428			version = strchr(field2, '(');
429			if (version == NULL) {
430				edge->operator = VER_ANY;
431				/* Get the versions hash number, adding it if the number isnt already in there */
432				edge->version = search_name_hashtable("ANY");
433			} else {
434				/* Skip leading ' ' or '(' */
435				version += strspn(version, " (");
436				/* Calculate length of any operator characters */
437				offset_ch = strspn(version, "<=>");
438				/* Determine operator */
439				if (offset_ch > 0) {
440					if (strncmp(version, "=", offset_ch) == 0) {
441						edge->operator = VER_EQUAL;
442					} else if (strncmp(version, "<<", offset_ch) == 0) {
443						edge->operator = VER_LESS;
444					} else if (strncmp(version, "<=", offset_ch) == 0) {
445						edge->operator = VER_LESS_EQUAL;
446					} else if (strncmp(version, ">>", offset_ch) == 0) {
447						edge->operator = VER_MORE;
448					} else if (strncmp(version, ">=", offset_ch) == 0) {
449						edge->operator = VER_MORE_EQUAL;
450					} else {
451						bb_error_msg_and_die("illegal operator");
452					}
453				}
454				/* skip to start of version numbers */
455				version += offset_ch;
456				version += strspn(version, " ");
457
458				/* Truncate version at trailing ' ' or ')' */
459				version[strcspn(version, " )")] = '\0';
460				/* Get the versions hash number, adding it if the number isnt already in there */
461				edge->version = search_name_hashtable(version);
462			}
463
464			/* Get the dependency name */
465			field2[strcspn(field2, " (")] = '\0';
466			edge->name = search_name_hashtable(field2);
467
468			if (or_edge)
469				or_edge->version++;
470
471			add_edge_to_node(parent_node, edge);
472			field2 = strtok_r(NULL, "|", &line_ptr2);
473		} while (field2 != NULL);
474
475		free(line2);
476		field = strtok_r(NULL, ",", &line_ptr1);
477	} while (field != NULL);
478
479	free(line);
480}
481
482static void free_package(common_node_t *node)
483{
484	unsigned i;
485	if (node) {
486		for (i = 0; i < node->num_of_edges; i++) {
487			free(node->edge[i]);
488		}
489		free(node->edge);
490		free(node);
491	}
492}
493
494/*
495 * Gets the next package field from package_buffer, separated into the field name
496 * and field value, it returns the int offset to the first character of the next field
497 */
498static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
499{
500	int offset_name_start = 0;
501	int offset_name_end = 0;
502	int offset_value_start = 0;
503	int offset_value_end = 0;
504	int offset = 0;
505	int next_offset;
506	int name_length;
507	int value_length;
508	int exit_flag = FALSE;
509
510	if (package_buffer == NULL) {
511		*field_name = NULL;
512		*field_value = NULL;
513		return -1;
514	}
515	while (1) {
516		next_offset = offset + 1;
517		switch (package_buffer[offset]) {
518			case '\0':
519				exit_flag = TRUE;
520				break;
521			case ':':
522				if (offset_name_end == 0) {
523					offset_name_end = offset;
524					offset_value_start = next_offset;
525				}
526				/* TODO: Name might still have trailing spaces if ':' isnt
527				 * immediately after name */
528				break;
529			case '\n':
530				/* TODO: The char next_offset may be out of bounds */
531				if (package_buffer[next_offset] != ' ') {
532					exit_flag = TRUE;
533					break;
534				}
535			case '\t':
536			case ' ':
537				/* increment the value start point if its a just filler */
538				if (offset_name_start == offset) {
539					offset_name_start++;
540				}
541				if (offset_value_start == offset) {
542					offset_value_start++;
543				}
544				break;
545		}
546		if (exit_flag) {
547			/* Check that the names are valid */
548			offset_value_end = offset;
549			name_length = offset_name_end - offset_name_start;
550			value_length = offset_value_end - offset_value_start;
551			if (name_length == 0) {
552				break;
553			}
554			if ((name_length > 0) && (value_length > 0)) {
555				break;
556			}
557
558			/* If not valid, start fresh with next field */
559			exit_flag = FALSE;
560			offset_name_start = offset + 1;
561			offset_name_end = 0;
562			offset_value_start = offset + 1;
563			offset_value_end = offset + 1;
564			offset++;
565		}
566		offset++;
567	}
568	*field_name = NULL;
569	if (name_length) {
570		*field_name = xstrndup(&package_buffer[offset_name_start], name_length);
571	}
572	*field_value = NULL;
573	if (value_length > 0) {
574		*field_value = xstrndup(&package_buffer[offset_value_start], value_length);
575	}
576	return next_offset;
577}
578
579static unsigned fill_package_struct(char *control_buffer)
580{
581	static const char field_names[] ALIGN1 =
582		"Package\0""Version\0"
583		"Pre-Depends\0""Depends\0""Replaces\0""Provides\0"
584		"Conflicts\0""Suggests\0""Recommends\0""Enhances\0";
585
586	common_node_t *new_node = xzalloc(sizeof(common_node_t));
587	char *field_name;
588	char *field_value;
589	int field_start = 0;
590	int num = -1;
591	int buffer_length = strlen(control_buffer);
592
593	new_node->version = search_name_hashtable("unknown");
594	while (field_start < buffer_length) {
595		unsigned field_num;
596
597		field_start += read_package_field(&control_buffer[field_start],
598				&field_name, &field_value);
599
600		if (field_name == NULL) {
601			goto fill_package_struct_cleanup;
602		}
603
604		field_num = index_in_strings(field_names, field_name);
605		switch (field_num) {
606		case 0: /* Package */
607			new_node->name = search_name_hashtable(field_value);
608			break;
609		case 1: /* Version */
610			new_node->version = search_name_hashtable(field_value);
611			break;
612		case 2: /* Pre-Depends */
613			add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
614			break;
615		case 3: /* Depends */
616			add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
617			break;
618		case 4: /* Replaces */
619			add_split_dependencies(new_node, field_value, EDGE_REPLACES);
620			break;
621		case 5: /* Provides */
622			add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
623			break;
624		case 6: /* Conflicts */
625			add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
626			break;
627		case 7: /* Suggests */
628			add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
629			break;
630		case 8: /* Recommends */
631			add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
632			break;
633		case 9: /* Enhances */
634			add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
635			break;
636		}
637 fill_package_struct_cleanup:
638		free(field_name);
639		free(field_value);
640	}
641
642	if (new_node->version == search_name_hashtable("unknown")) {
643		free_package(new_node);
644		return -1;
645	}
646	num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
647	free_package(package_hashtable[num]);
648	package_hashtable[num] = new_node;
649	return num;
650}
651
652/* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
653static unsigned get_status(const unsigned status_node, const int num)
654{
655	char *status_string = name_hashtable[status_hashtable[status_node]->status];
656	char *state_sub_string;
657	unsigned state_sub_num;
658	int len;
659	int i;
660
661	/* set tmp_string to point to the start of the word number */
662	for (i = 1; i < num; i++) {
663		/* skip past a word */
664		status_string += strcspn(status_string, " ");
665		/* skip past the separating spaces */
666		status_string += strspn(status_string, " ");
667	}
668	len = strcspn(status_string, " \n");
669	state_sub_string = xstrndup(status_string, len);
670	state_sub_num = search_name_hashtable(state_sub_string);
671	free(state_sub_string);
672	return state_sub_num;
673}
674
675static void set_status(const unsigned status_node_num, const char *new_value, const int position)
676{
677	const unsigned new_value_len = strlen(new_value);
678	const unsigned new_value_num = search_name_hashtable(new_value);
679	unsigned want = get_status(status_node_num, 1);
680	unsigned flag = get_status(status_node_num, 2);
681	unsigned status = get_status(status_node_num, 3);
682	int want_len = strlen(name_hashtable[want]);
683	int flag_len = strlen(name_hashtable[flag]);
684	int status_len = strlen(name_hashtable[status]);
685	char *new_status;
686
687	switch (position) {
688		case 1:
689			want = new_value_num;
690			want_len = new_value_len;
691			break;
692		case 2:
693			flag = new_value_num;
694			flag_len = new_value_len;
695			break;
696		case 3:
697			status = new_value_num;
698			status_len = new_value_len;
699			break;
700		default:
701			bb_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
702	}
703
704	new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
705	status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
706	free(new_status);
707}
708
709static const char *describe_status(int status_num)
710{
711	int status_want, status_state;
712	if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
713		return "is not installed or flagged to be installed";
714
715	status_want = get_status(status_num, 1);
716	status_state = get_status(status_num, 3);
717
718	if (status_state == search_name_hashtable("installed")) {
719		if (status_want == search_name_hashtable("install"))
720			return "is installed";
721		if (status_want == search_name_hashtable("deinstall"))
722			return "is marked to be removed";
723		if (status_want == search_name_hashtable("purge"))
724			return "is marked to be purged";
725	}
726	if (status_want == search_name_hashtable("unknown"))
727		return "is in an indeterminate state";
728	if (status_want == search_name_hashtable("install"))
729		return "is marked to be installed";
730
731	return "is not installed or flagged to be installed";
732}
733
734static void index_status_file(const char *filename)
735{
736	FILE *status_file;
737	char *control_buffer;
738	char *status_line;
739	status_node_t *status_node = NULL;
740	unsigned status_num;
741
742	status_file = xfopen_for_read(filename);
743	while ((control_buffer = xmalloc_fgetline_str(status_file, "\n\n")) != NULL) {
744		const unsigned package_num = fill_package_struct(control_buffer);
745		if (package_num != -1) {
746			status_node = xmalloc(sizeof(status_node_t));
747			/* fill_package_struct doesnt handle the status field */
748			status_line = strstr(control_buffer, "Status:");
749			if (status_line != NULL) {
750				status_line += 7;
751				status_line += strspn(status_line, " \n\t");
752				status_line = xstrndup(status_line, strcspn(status_line, "\n"));
753				status_node->status = search_name_hashtable(status_line);
754				free(status_line);
755			}
756			status_node->package = package_num;
757			status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
758			status_hashtable[status_num] = status_node;
759		}
760		free(control_buffer);
761	}
762	fclose(status_file);
763}
764
765static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
766{
767	char *name;
768	char *value;
769	int start = 0;
770	while (1) {
771		start += read_package_field(&control_buffer[start], &name, &value);
772		if (name == NULL) {
773			break;
774		}
775		if (strcmp(name, "Status") != 0) {
776			fprintf(new_status_file, "%s: %s\n", name, value);
777		}
778	}
779}
780
781/* This could do with a cleanup */
782static void write_status_file(deb_file_t **deb_file)
783{
784	FILE *old_status_file = xfopen_for_read("/var/lib/dpkg/status");
785	FILE *new_status_file = xfopen_for_write("/var/lib/dpkg/status.udeb");
786	char *package_name;
787	char *status_from_file;
788	char *control_buffer = NULL;
789	char *tmp_string;
790	int status_num;
791	int field_start = 0;
792	int write_flag;
793	int i = 0;
794
795	/* Update previously known packages */
796	while ((control_buffer = xmalloc_fgetline_str(old_status_file, "\n\n")) != NULL) {
797		tmp_string = strstr(control_buffer, "Package:");
798		if (tmp_string == NULL) {
799			continue;
800		}
801
802		tmp_string += 8;
803		tmp_string += strspn(tmp_string, " \n\t");
804		package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
805		write_flag = FALSE;
806		tmp_string = strstr(control_buffer, "Status:");
807		if (tmp_string != NULL) {
808			/* Separate the status value from the control buffer */
809			tmp_string += 7;
810			tmp_string += strspn(tmp_string, " \n\t");
811			status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
812		} else {
813			status_from_file = NULL;
814		}
815
816		/* Find this package in the status hashtable */
817		status_num = search_status_hashtable(package_name);
818		if (status_hashtable[status_num] != NULL) {
819			const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
820			if (strcmp(status_from_file, status_from_hashtable) != 0) {
821				/* New status isnt exactly the same as old status */
822				const int state_status = get_status(status_num, 3);
823				if ((strcmp("installed", name_hashtable[state_status]) == 0)
824				 || (strcmp("unpacked", name_hashtable[state_status]) == 0)
825				) {
826					/* We need to add the control file from the package */
827					i = 0;
828					while (deb_file[i] != NULL) {
829						if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
830							/* Write a status file entry with a modified status */
831							/* remove trailing \n's */
832							write_buffer_no_status(new_status_file, deb_file[i]->control_file);
833							set_status(status_num, "ok", 2);
834							fprintf(new_status_file, "Status: %s\n\n",
835									name_hashtable[status_hashtable[status_num]->status]);
836							write_flag = TRUE;
837							break;
838						}
839						i++;
840					}
841					/* This is temperary, debugging only */
842					if (deb_file[i] == NULL) {
843						bb_error_msg_and_die("ALERT: cannot find a control file, "
844							"your status file may be broken, status may be "
845							"incorrect for %s", package_name);
846					}
847				}
848				else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
849					/* Only write the Package, Status, Priority and Section lines */
850					fprintf(new_status_file, "Package: %s\n", package_name);
851					fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
852
853					while (1) {
854						char *field_name;
855						char *field_value;
856						field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
857						if (field_name == NULL) {
858							break;
859						}
860						if ((strcmp(field_name, "Priority") == 0)
861						 || (strcmp(field_name, "Section") == 0)
862						) {
863							fprintf(new_status_file, "%s: %s\n", field_name, field_value);
864						}
865					}
866					write_flag = TRUE;
867					fputs("\n", new_status_file);
868				}
869				else if	(strcmp("config-files", name_hashtable[state_status]) == 0) {
870					/* only change the status line */
871					while (1) {
872						char *field_name;
873						char *field_value;
874						field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
875						if (field_name == NULL) {
876							break;
877						}
878						/* Setup start point for next field */
879						if (strcmp(field_name, "Status") == 0) {
880							fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
881						} else {
882							fprintf(new_status_file, "%s: %s\n", field_name, field_value);
883						}
884					}
885					write_flag = TRUE;
886					fputs("\n", new_status_file);
887				}
888			}
889		}
890		/* If the package from the status file wasnt handle above, do it now*/
891		if (!write_flag) {
892			fprintf(new_status_file, "%s\n\n", control_buffer);
893		}
894
895		free(status_from_file);
896		free(package_name);
897		free(control_buffer);
898	}
899
900	/* Write any new packages */
901	for (i = 0; deb_file[i] != NULL; i++) {
902		status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
903		if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
904			write_buffer_no_status(new_status_file, deb_file[i]->control_file);
905			set_status(status_num, "ok", 2);
906			fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
907		}
908	}
909	fclose(old_status_file);
910	fclose(new_status_file);
911
912	/* Create a separate backfile to dpkg */
913	if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
914		if (errno != ENOENT)
915			bb_error_msg_and_die("can't create backup status file");
916		/* Its ok if renaming the status file fails because status
917		 * file doesnt exist, maybe we are starting from scratch */
918		bb_error_msg("no status file found, creating new one");
919	}
920
921	xrename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status");
922}
923
924/* This function returns TRUE if the given package can satisfy a
925 * dependency of type depend_type.
926 *
927 * A pre-depends is satisfied only if a package is already installed,
928 * which a regular depends can be satisfied by a package which we want
929 * to install.
930 */
931static int package_satisfies_dependency(int package, int depend_type)
932{
933	int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
934
935	/* status could be unknown if package is a pure virtual
936	 * provides which cannot satisfy any dependency by itself.
937	 */
938	if (status_hashtable[status_num] == NULL)
939		return 0;
940
941	switch (depend_type) {
942	case EDGE_PRE_DEPENDS:	return get_status(status_num, 3) == search_name_hashtable("installed");
943	case EDGE_DEPENDS:	return get_status(status_num, 1) == search_name_hashtable("install");
944	}
945	return 0;
946}
947
948static int check_deps(deb_file_t **deb_file, int deb_start /*, int dep_max_count - ?? */)
949{
950	int *conflicts = NULL;
951	int conflicts_num = 0;
952	int i = deb_start;
953	int j;
954
955	/* Check for conflicts
956	 * TODO: TEST if conflicts with other packages to be installed
957	 *
958	 * Add install packages and the packages they provide
959	 * to the list of files to check conflicts for
960	 */
961
962	/* Create array of package numbers to check against
963	 * installed package for conflicts*/
964	while (deb_file[i] != NULL) {
965		const unsigned package_num = deb_file[i]->package;
966		conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
967		conflicts[conflicts_num] = package_num;
968		conflicts_num++;
969		/* add provides to conflicts list */
970		for (j = 0; j <	package_hashtable[package_num]->num_of_edges; j++) {
971			if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
972				const int conflicts_package_num = search_package_hashtable(
973					package_hashtable[package_num]->edge[j]->name,
974					package_hashtable[package_num]->edge[j]->version,
975					package_hashtable[package_num]->edge[j]->operator);
976				if (package_hashtable[conflicts_package_num] == NULL) {
977					/* create a new package */
978					common_node_t *new_node = xzalloc(sizeof(common_node_t));
979					new_node->name = package_hashtable[package_num]->edge[j]->name;
980					new_node->version = package_hashtable[package_num]->edge[j]->version;
981					package_hashtable[conflicts_package_num] = new_node;
982				}
983				conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
984				conflicts[conflicts_num] = conflicts_package_num;
985				conflicts_num++;
986			}
987		}
988		i++;
989	}
990
991	/* Check conflicts */
992	i = 0;
993	while (deb_file[i] != NULL) {
994		const common_node_t *package_node = package_hashtable[deb_file[i]->package];
995		int status_num = 0;
996		status_num = search_status_hashtable(name_hashtable[package_node->name]);
997
998		if (get_status(status_num, 3) == search_name_hashtable("installed")) {
999			i++;
1000			continue;
1001		}
1002
1003		for (j = 0; j < package_node->num_of_edges; j++) {
1004			const edge_t *package_edge = package_node->edge[j];
1005
1006			if (package_edge->type == EDGE_CONFLICTS) {
1007				const unsigned package_num =
1008					search_package_hashtable(package_edge->name,
1009								 package_edge->version,
1010								 package_edge->operator);
1011				int result = 0;
1012				if (package_hashtable[package_num] != NULL) {
1013					status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1014
1015					if (get_status(status_num, 1) == search_name_hashtable("install")) {
1016						result = test_version(package_hashtable[deb_file[i]->package]->version,
1017							package_edge->version, package_edge->operator);
1018					}
1019				}
1020
1021				if (result) {
1022					bb_error_msg_and_die("package %s conflicts with %s",
1023						name_hashtable[package_node->name],
1024						name_hashtable[package_edge->name]);
1025				}
1026			}
1027		}
1028		i++;
1029	}
1030
1031
1032	/* Check dependendcies */
1033	for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1034		int status_num = 0;
1035		int number_of_alternatives = 0;
1036		const edge_t * root_of_alternatives = NULL;
1037		const common_node_t *package_node = package_hashtable[i];
1038
1039		/* If the package node does not exist then this
1040		 * package is a virtual one. In which case there are
1041		 * no dependencies to check.
1042		 */
1043		if (package_node == NULL) continue;
1044
1045		status_num = search_status_hashtable(name_hashtable[package_node->name]);
1046
1047		/* If there is no status then this package is a
1048		 * virtual one provided by something else. In which
1049		 * case there are no dependencies to check.
1050		 */
1051		if (status_hashtable[status_num] == NULL) continue;
1052
1053		/* If we don't want this package installed then we may
1054		 * as well ignore it's dependencies.
1055		 */
1056		if (get_status(status_num, 1) != search_name_hashtable("install")) {
1057			continue;
1058		}
1059
1060		/* This code is tested only for EDGE_DEPENDS, since I
1061		 * have no suitable pre-depends available. There is no
1062		 * reason that it shouldn't work though :-)
1063		 */
1064		for (j = 0; j < package_node->num_of_edges; j++) {
1065			const edge_t *package_edge = package_node->edge[j];
1066			unsigned package_num;
1067
1068			if (package_edge->type == EDGE_OR_PRE_DEPENDS
1069			 || package_edge->type == EDGE_OR_DEPENDS
1070			) {	/* start an EDGE_OR_ list */
1071				number_of_alternatives = package_edge->version;
1072				root_of_alternatives = package_edge;
1073				continue;
1074			}
1075			if (number_of_alternatives == 0) {	/* not in the middle of an EDGE_OR_ list */
1076				number_of_alternatives = 1;
1077				root_of_alternatives = NULL;
1078			}
1079
1080			package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1081
1082			if (package_edge->type == EDGE_PRE_DEPENDS
1083			 || package_edge->type == EDGE_DEPENDS
1084			) {
1085				int result=1;
1086				status_num = 0;
1087
1088				/* If we are inside an alternative then check
1089				 * this edge is the right type.
1090				 *
1091				 * EDGE_DEPENDS == OR_DEPENDS -1
1092				 * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1093				 */
1094				if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1095					bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1096							     package_edge->type, root_of_alternatives->type);
1097
1098				if (package_hashtable[package_num] != NULL)
1099					result = !package_satisfies_dependency(package_num, package_edge->type);
1100
1101				if (result) { /* check for other package which provide what we are looking for */
1102					int provider = -1;
1103
1104					while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1105						if (package_hashtable[provider] == NULL) {
1106							puts("Have a provider but no package information for it");
1107							continue;
1108						}
1109						result = !package_satisfies_dependency(provider, package_edge->type);
1110
1111						if (result == 0)
1112							break;
1113					}
1114				}
1115
1116				/* It must be already installed, or to be installed */
1117				number_of_alternatives--;
1118				if (result && number_of_alternatives == 0) {
1119					if (root_of_alternatives)
1120						bb_error_msg_and_die(
1121							"package %s %sdepends on %s, "
1122							"which cannot be satisfied",
1123							name_hashtable[package_node->name],
1124							package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1125							name_hashtable[root_of_alternatives->name]);
1126					bb_error_msg_and_die(
1127						"package %s %sdepends on %s, which %s\n",
1128						name_hashtable[package_node->name],
1129						package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1130						name_hashtable[package_edge->name],
1131						describe_status(status_num));
1132				}
1133				if (result == 0 && number_of_alternatives) {
1134					/* we've found a package which
1135					 * satisfies the dependency,
1136					 * so skip over the rest of
1137					 * the alternatives.
1138					 */
1139					j += number_of_alternatives;
1140					number_of_alternatives = 0;
1141				}
1142			}
1143		}
1144	}
1145	free(conflicts);
1146	return TRUE;
1147}
1148
1149static char **create_list(const char *filename)
1150{
1151	FILE *list_stream;
1152	char **file_list;
1153	char *line;
1154	int count;
1155
1156	/* don't use [xw]fopen here, handle error ourself */
1157	list_stream = fopen_for_read(filename);
1158	if (list_stream == NULL) {
1159		return NULL;
1160	}
1161
1162	file_list = NULL;
1163	count = 0;
1164	while ((line = xmalloc_fgetline(list_stream)) != NULL) {
1165		file_list = xrealloc_vector(file_list, 2, count);
1166		file_list[count++] = line;
1167		/*file_list[count] = NULL; - xrealloc_vector did it */
1168	}
1169	fclose(list_stream);
1170
1171	return file_list;
1172}
1173
1174/* maybe i should try and hook this into remove_file.c somehow */
1175static int remove_file_array(char **remove_names, char **exclude_names)
1176{
1177	struct stat path_stat;
1178	int remove_flag = 1; /* not removed anything yet */
1179	int i, j;
1180
1181	if (remove_names == NULL) {
1182		return 0;
1183	}
1184	for (i = 0; remove_names[i] != NULL; i++) {
1185		if (exclude_names != NULL) {
1186			for (j = 0; exclude_names[j] != NULL; j++) {
1187				if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1188					goto skip;
1189				}
1190			}
1191		}
1192		/* TODO: why we are checking lstat? we can just try rm/rmdir */
1193		if (lstat(remove_names[i], &path_stat) < 0) {
1194			continue;
1195		}
1196		if (S_ISDIR(path_stat.st_mode)) {
1197			remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
1198		} else {
1199			remove_flag &= unlink(remove_names[i]); /* 0 if no error */
1200		}
1201 skip:
1202		continue;
1203	}
1204	return (remove_flag == 0);
1205}
1206
1207static void run_package_script_or_die(const char *package_name, const char *script_type)
1208{
1209	char *script_path;
1210	int result;
1211
1212	script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1213
1214	/* If the file doesnt exist is isnt fatal */
1215	result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
1216	free(script_path);
1217	if (result)
1218		bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
1219}
1220
1221/*
1222The policy manual defines what scripts get called when and with
1223what arguments. I realize that busybox does not support all of
1224these scenarios, but it does support some of them; it does not,
1225however, run them with any parameters in run_package_script_or_die().
1226Here are the scripts:
1227
1228preinst install
1229preinst install <old_version>
1230preinst upgrade <old_version>
1231preinst abort_upgrade <new_version>
1232postinst configure <most_recent_version>
1233postinst abort-upgade <new_version>
1234postinst abort-remove
1235postinst abort-remove in-favour <package> <version>
1236postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
1237prerm remove
1238prerm upgrade <new_version>
1239prerm failed-upgrade <old_version>
1240prerm remove in-favor <package> <new_version>
1241prerm deconfigure in-favour <package> <version> removing <package> <version>
1242postrm remove
1243postrm purge
1244postrm upgrade <new_version>
1245postrm failed-upgrade <old_version>
1246postrm abort-install
1247postrm abort-install <old_version>
1248postrm abort-upgrade <old_version>
1249postrm disappear <overwriter> <version>
1250*/
1251static const char *const all_control_files[] = {
1252	"preinst", "postinst", "prerm", "postrm",
1253	"list", "md5sums", "shlibs", "conffiles",
1254	"config", "templates"
1255};
1256
1257static char **all_control_list(const char *package_name)
1258{
1259	unsigned i = 0;
1260	char **remove_files;
1261
1262	/* Create a list of all /var/lib/dpkg/info/<package> files */
1263	remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
1264	while (i < ARRAY_SIZE(all_control_files)) {
1265		remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
1266				package_name, all_control_files[i]);
1267		i++;
1268	}
1269
1270	return remove_files;
1271}
1272
1273static void free_array(char **array)
1274{
1275	if (array) {
1276		unsigned i = 0;
1277		while (array[i]) {
1278			free(array[i]);
1279			i++;
1280		}
1281		free(array);
1282	}
1283}
1284
1285/* This function lists information on the installed packages. It loops through
1286 * the status_hashtable to retrieve the info. This results in smaller code than
1287 * scanning the status file. The resulting list, however, is unsorted.
1288 */
1289static void list_packages(const char *pattern)
1290{
1291	int i;
1292
1293	puts("    Name           Version");
1294	puts("+++-==============-==============");
1295
1296	/* go through status hash, dereference package hash and finally strings */
1297	for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
1298		if (status_hashtable[i]) {
1299			const char *stat_str;  /* status string */
1300			const char *name_str;  /* package name */
1301			const char *vers_str;  /* version */
1302			char  s1, s2;          /* status abbreviations */
1303			int   spccnt;          /* space count */
1304			int   j;
1305
1306			stat_str = name_hashtable[status_hashtable[i]->status];
1307			name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1308			vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1309
1310			if (pattern && fnmatch(pattern, name_str, 0) != 0)
1311				continue;
1312
1313			/* get abbreviation for status field 1 */
1314			s1 = stat_str[0] == 'i' ? 'i' : 'r';
1315
1316			/* get abbreviation for status field 2 */
1317			for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
1318				if (stat_str[j] == ' ') spccnt++;
1319			}
1320			s2 = stat_str[j];
1321
1322			/* print out the line formatted like Debian dpkg */
1323			printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1324		}
1325	}
1326}
1327
1328static void remove_package(const unsigned package_num, int noisy)
1329{
1330	const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1331	const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1332	const unsigned status_num = search_status_hashtable(package_name);
1333	const int package_name_length = strlen(package_name);
1334	char **remove_files;
1335	char **exclude_files;
1336	char list_name[package_name_length + 25];
1337	char conffile_name[package_name_length + 30];
1338
1339	if (noisy)
1340		printf("Removing %s (%s)...\n", package_name, package_version);
1341
1342	/* Run prerm script */
1343	run_package_script_or_die(package_name, "prerm");
1344
1345	/* Create a list of files to remove, and a separate list of those to keep */
1346	sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1347	remove_files = create_list(list_name);
1348
1349	sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
1350	exclude_files = create_list(conffile_name);
1351
1352	/* Some directories can't be removed straight away, so do multiple passes */
1353	while (remove_file_array(remove_files, exclude_files))
1354		continue;
1355	free_array(exclude_files);
1356	free_array(remove_files);
1357
1358	/* Create a list of files in /var/lib/dpkg/info/<package>.* to keep */
1359	exclude_files = xzalloc(sizeof(exclude_files[0]) * 3);
1360	exclude_files[0] = xstrdup(conffile_name);
1361	exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1362
1363	/* Create a list of all /var/lib/dpkg/info/<package> files */
1364	remove_files = all_control_list(package_name);
1365
1366	remove_file_array(remove_files, exclude_files);
1367	free_array(remove_files);
1368	free_array(exclude_files);
1369
1370	/* rename <package>.conffiles to <package>.list
1371	 * The conffiles control file isn't required in Debian packages, so don't
1372	 * error out if it's missing.  */
1373	rename(conffile_name, list_name);
1374
1375	/* Change package status */
1376	set_status(status_num, "config-files", 3);
1377}
1378
1379static void purge_package(const unsigned package_num)
1380{
1381	const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1382	const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1383	const unsigned status_num = search_status_hashtable(package_name);
1384	char **remove_files;
1385	char **exclude_files;
1386	char list_name[strlen(package_name) + 25];
1387
1388	printf("Purging %s (%s)...\n", package_name, package_version);
1389
1390	/* Run prerm script */
1391	run_package_script_or_die(package_name, "prerm");
1392
1393	/* Create a list of files to remove */
1394	sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1395	remove_files = create_list(list_name);
1396
1397	/* Some directories cant be removed straight away, so do multiple passes */
1398	while (remove_file_array(remove_files, NULL))
1399		continue;
1400	free_array(remove_files);
1401
1402	/* Create a list of all /var/lib/dpkg/info/<package> files */
1403	remove_files = all_control_list(package_name);
1404
1405	/* Delete all of them except the postrm script */
1406	exclude_files = xzalloc(sizeof(exclude_files[0]) * 2);
1407	exclude_files[0] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1408	remove_file_array(remove_files, exclude_files);
1409	free_array(exclude_files);
1410
1411	/* Run and remove postrm script */
1412	run_package_script_or_die(package_name, "postrm");
1413	remove_file_array(remove_files, NULL);
1414
1415	free_array(remove_files);
1416
1417	/* Change package status */
1418	set_status(status_num, "not-installed", 3);
1419}
1420
1421static archive_handle_t *init_archive_deb_ar(const char *filename)
1422{
1423	archive_handle_t *ar_handle;
1424
1425	/* Setup an ar archive handle that refers to the gzip sub archive */
1426	ar_handle = init_handle();
1427	ar_handle->filter = filter_accept_list_reassign;
1428	ar_handle->src_fd = xopen(filename, O_RDONLY);
1429
1430	return ar_handle;
1431}
1432
1433static void init_archive_deb_control(archive_handle_t *ar_handle)
1434{
1435	archive_handle_t *tar_handle;
1436
1437	/* Setup the tar archive handle */
1438	tar_handle = init_handle();
1439	tar_handle->src_fd = ar_handle->src_fd;
1440
1441	/* We don't care about data.tar.* or debian-binary, just control.tar.* */
1442#if ENABLE_FEATURE_SEAMLESS_GZ
1443	llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1444#endif
1445#if ENABLE_FEATURE_SEAMLESS_BZ2
1446	llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1447#endif
1448
1449	/* Assign the tar handle as a subarchive of the ar handle */
1450	ar_handle->dpkg__sub_archive = tar_handle;
1451}
1452
1453static void init_archive_deb_data(archive_handle_t *ar_handle)
1454{
1455	archive_handle_t *tar_handle;
1456
1457	/* Setup the tar archive handle */
1458	tar_handle = init_handle();
1459	tar_handle->src_fd = ar_handle->src_fd;
1460
1461	/* We don't care about control.tar.* or debian-binary, just data.tar.* */
1462#if ENABLE_FEATURE_SEAMLESS_GZ
1463	llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1464#endif
1465#if ENABLE_FEATURE_SEAMLESS_BZ2
1466	llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
1467#endif
1468
1469	/* Assign the tar handle as a subarchive of the ar handle */
1470	ar_handle->dpkg__sub_archive = tar_handle;
1471}
1472
1473static void FAST_FUNC data_extract_to_buffer(archive_handle_t *archive_handle)
1474{
1475	unsigned size = archive_handle->file_header->size;
1476
1477	archive_handle->dpkg__buffer = xzalloc(size + 1);
1478	xread(archive_handle->src_fd, archive_handle->dpkg__buffer, size);
1479}
1480
1481static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1482{
1483	ar_handle->dpkg__sub_archive->action_data = data_extract_to_buffer;
1484	ar_handle->dpkg__sub_archive->accept = myaccept;
1485	ar_handle->dpkg__sub_archive->filter = filter_accept_list;
1486
1487	unpack_ar_archive(ar_handle);
1488	close(ar_handle->src_fd);
1489
1490	return ar_handle->dpkg__sub_archive->dpkg__buffer;
1491}
1492
1493static void append_control_file_to_llist(const char *package_name, const char *control_name, llist_t **ll)
1494{
1495	FILE *fp;
1496	char *filename, *line;
1497
1498	filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, control_name);
1499	fp = fopen_for_read(filename);
1500	free(filename);
1501	if (fp != NULL) {
1502		while ((line = xmalloc_fgetline(fp)) != NULL)
1503			llist_add_to(ll, line);
1504		fclose(fp);
1505	}
1506}
1507
1508static char FAST_FUNC filter_rename_config(archive_handle_t *archive_handle)
1509{
1510	int fd;
1511	char *name_ptr = archive_handle->file_header->name + 1;
1512
1513	/* Is this file marked as config file? */
1514	if (!find_list_entry(archive_handle->accept, name_ptr))
1515		return EXIT_SUCCESS; /* no */
1516
1517	fd = open(name_ptr, O_RDONLY);
1518	if (fd >= 0) {
1519		md5_ctx_t md5;
1520		char *md5line, *buf;
1521		int count;
1522
1523		/* Calculate MD5 of existing file */
1524		buf = xmalloc(4096);
1525		md5_begin(&md5);
1526		while ((count = safe_read(fd, buf, 4096)) > 0)
1527			md5_hash(buf, count, &md5);
1528		md5_end(buf, &md5); /* using buf as result storage */
1529		close(fd);
1530
1531		md5line = xmalloc(16 * 2 + 2 + strlen(name_ptr) + 1);
1532		sprintf(bin2hex(md5line, buf, 16), "  %s", name_ptr);
1533		free(buf);
1534
1535		/* Is it changed after install? */
1536		if (find_list_entry(archive_handle->accept, md5line) == NULL) {
1537			printf("Warning: Creating %s as %s.dpkg-new\n", name_ptr, name_ptr);
1538			archive_handle->file_header->name = xasprintf("%s.dpkg-new", archive_handle->file_header->name);
1539		}
1540		free(md5line);
1541	}
1542	return EXIT_SUCCESS;
1543}
1544
1545static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
1546{
1547	char *name_ptr = archive_handle->file_header->name;
1548
1549	/* Skip all leading "/" */
1550	while (*name_ptr == '/')
1551		name_ptr++;
1552	/* Skip all leading "./" and "../" */
1553	while (name_ptr[0] == '.') {
1554		if (name_ptr[1] == '.')
1555			name_ptr++;
1556		if (name_ptr[1] != '/')
1557			break;
1558		name_ptr += 2;
1559	}
1560
1561	if (name_ptr[0] != '\0') {
1562		archive_handle->file_header->name = xasprintf("%s%s", archive_handle->dpkg__buffer, name_ptr);
1563		data_extract_all(archive_handle);
1564		if (fnmatch("*.dpkg-new", archive_handle->file_header->name, 0) == 0) {
1565			/* remove .dpkg-new suffix */
1566			archive_handle->file_header->name[strlen(archive_handle->file_header->name) - 9] = '\0';
1567		}
1568	}
1569}
1570
1571enum {
1572	/* Commands */
1573	OPT_configure            = (1 << 0),
1574	OPT_install              = (1 << 1),
1575	OPT_list_installed       = (1 << 2),
1576	OPT_purge                = (1 << 3),
1577	OPT_remove               = (1 << 4),
1578	OPT_unpack               = (1 << 5),
1579	OPTMASK_cmd              = (1 << 6) - 1,
1580	/* Options */
1581	OPT_force                = (1 << 6),
1582	OPT_force_ignore_depends = (1 << 7),
1583	OPT_force_confnew        = (1 << 8),
1584	OPT_force_confold        = (1 << 9),
1585};
1586
1587static void unpack_package(deb_file_t *deb_file)
1588{
1589	const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1590	const unsigned status_num = search_status_hashtable(package_name);
1591	const unsigned status_package_num = status_hashtable[status_num]->package;
1592	char *info_prefix;
1593	char *list_filename;
1594	archive_handle_t *archive_handle;
1595	FILE *out_stream;
1596	llist_t *accept_list;
1597	llist_t *conffile_list;
1598	int i;
1599
1600	/* If existing version, remove it first */
1601	conffile_list = NULL;
1602	if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1603		/* Package is already installed, remove old version first */
1604		printf("Preparing to replace %s %s (using %s)...\n", package_name,
1605			name_hashtable[package_hashtable[status_package_num]->version],
1606			deb_file->filename);
1607
1608		/* Read md5sums from old package */
1609		if (!(option_mask32 & OPT_force_confold))
1610			append_control_file_to_llist(package_name, "md5sums", &conffile_list);
1611
1612		remove_package(status_package_num, 0);
1613	} else {
1614		printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1615	}
1616
1617	/* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1618	info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
1619	archive_handle = init_archive_deb_ar(deb_file->filename);
1620	init_archive_deb_control(archive_handle);
1621
1622	accept_list = NULL;
1623	i = 0;
1624	while (i < ARRAY_SIZE(all_control_files)) {
1625		char *c = xasprintf("./%s", all_control_files[i]);
1626		llist_add_to(&accept_list, c);
1627		i++;
1628	}
1629	archive_handle->dpkg__sub_archive->accept = accept_list;
1630	archive_handle->dpkg__sub_archive->filter = filter_accept_list;
1631	archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1632	archive_handle->dpkg__sub_archive->dpkg__buffer = info_prefix;
1633	archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1634	unpack_ar_archive(archive_handle);
1635
1636	/* Run the preinst prior to extracting */
1637	run_package_script_or_die(package_name, "preinst");
1638
1639	/* Don't overwrite existing config files */
1640	if (!(option_mask32 & OPT_force_confnew))
1641		append_control_file_to_llist(package_name, "conffiles", &conffile_list);
1642
1643	/* Extract data.tar.gz to the root directory */
1644	archive_handle = init_archive_deb_ar(deb_file->filename);
1645	init_archive_deb_data(archive_handle);
1646	archive_handle->dpkg__sub_archive->accept = conffile_list;
1647	archive_handle->dpkg__sub_archive->filter = filter_rename_config;
1648	archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1649	archive_handle->dpkg__sub_archive->dpkg__buffer = (char*)"/"; /* huh? */
1650	archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1651	unpack_ar_archive(archive_handle);
1652
1653	/* Create the list file */
1654	list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
1655	out_stream = xfopen_for_write(list_filename);
1656	while (archive_handle->dpkg__sub_archive->passed) {
1657		/* the leading . has been stripped by data_extract_all_prefix already */
1658		fputs(archive_handle->dpkg__sub_archive->passed->data, out_stream);
1659		fputc('\n', out_stream);
1660		archive_handle->dpkg__sub_archive->passed = archive_handle->dpkg__sub_archive->passed->link;
1661	}
1662	fclose(out_stream);
1663
1664	/* change status */
1665	set_status(status_num, "install", 1);
1666	set_status(status_num, "unpacked", 3);
1667
1668	free(info_prefix);
1669	free(list_filename);
1670}
1671
1672static void configure_package(deb_file_t *deb_file)
1673{
1674	const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1675	const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1676	const int status_num = search_status_hashtable(package_name);
1677
1678	printf("Setting up %s (%s)...\n", package_name, package_version);
1679
1680	/* Run the postinst script */
1681	/* TODO: handle failure gracefully */
1682	run_package_script_or_die(package_name, "postinst");
1683
1684	/* Change status to reflect success */
1685	set_status(status_num, "install", 1);
1686	set_status(status_num, "installed", 3);
1687}
1688
1689int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1690int dpkg_main(int argc UNUSED_PARAM, char **argv)
1691{
1692	deb_file_t **deb_file = NULL;
1693	status_node_t *status_node;
1694	char *str_f;
1695	int opt;
1696	int package_num;
1697	int deb_count = 0;
1698	int state_status;
1699	int status_num;
1700	int i;
1701#if ENABLE_LONG_OPTS
1702	static const char dpkg_longopts[] ALIGN1 =
1703// FIXME: we use -C non-compatibly, should be:
1704// "-C|--audit Check for broken package(s)"
1705		"configure\0"      No_argument        "C"
1706		"force\0"          Required_argument  "F"
1707		"install\0"        No_argument        "i"
1708		"list\0"           No_argument        "l"
1709		"purge\0"          No_argument        "P"
1710		"remove\0"         No_argument        "r"
1711		"unpack\0"         No_argument        "u"
1712		"force-depends\0"  No_argument        "\xff"
1713		"force-confnew\0"  No_argument        "\xfe"
1714		"force-confold\0"  No_argument        "\xfd"
1715		;
1716#endif
1717
1718	INIT_G();
1719
1720	IF_LONG_OPTS(applet_long_options = dpkg_longopts);
1721	opt = getopt32(argv, "CilPruF:", &str_f);
1722	argv += optind;
1723	//if (opt & OPT_configure) ... // -C
1724	if (opt & OPT_force) { // -F (--force in official dpkg)
1725		if (strcmp(str_f, "depends") == 0)
1726			opt |= OPT_force_ignore_depends;
1727		else if (strcmp(str_f, "confnew") == 0)
1728			opt |= OPT_force_confnew;
1729		else if (strcmp(str_f, "confold") == 0)
1730			opt |= OPT_force_confold;
1731		else
1732			bb_show_usage();
1733		option_mask32 = opt;
1734	}
1735	//if (opt & OPT_install) ... // -i
1736	//if (opt & OPT_list_installed) ... // -l
1737	//if (opt & OPT_purge) ... // -P
1738	//if (opt & OPT_remove) ... // -r
1739	//if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1740	if (!(opt & OPTMASK_cmd) /* no cmd */
1741	 || ((opt & OPTMASK_cmd) & ((opt & OPTMASK_cmd)-1)) /* more than one cmd */
1742	) {
1743		bb_show_usage();
1744	}
1745
1746/*	puts("(Reading database ... xxxxx files and directories installed.)"); */
1747	index_status_file("/var/lib/dpkg/status");
1748
1749	/* if the list action was given print the installed packages and exit */
1750	if (opt & OPT_list_installed) {
1751		list_packages(argv[0]); /* param can be NULL */
1752		return EXIT_SUCCESS;
1753	}
1754
1755	/* Read arguments and store relevant info in structs */
1756	while (*argv) {
1757		/* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1758		deb_file = xrealloc_vector(deb_file, 2, deb_count);
1759		deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1760		if (opt & (OPT_install | OPT_unpack)) {
1761			/* -i/-u: require filename */
1762			archive_handle_t *archive_handle;
1763			llist_t *control_list = NULL;
1764
1765			/* Extract the control file */
1766			llist_add_to(&control_list, (char*)"./control");
1767			archive_handle = init_archive_deb_ar(argv[0]);
1768			init_archive_deb_control(archive_handle);
1769			deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1770			if (deb_file[deb_count]->control_file == NULL) {
1771				bb_error_msg_and_die("can't extract control file");
1772			}
1773			deb_file[deb_count]->filename = xstrdup(argv[0]);
1774			package_num = fill_package_struct(deb_file[deb_count]->control_file);
1775
1776			if (package_num == -1) {
1777				bb_error_msg("invalid control file in %s", argv[0]);
1778				argv++;
1779				continue;
1780			}
1781			deb_file[deb_count]->package = (unsigned) package_num;
1782
1783			/* Add the package to the status hashtable */
1784			if (opt & (OPT_unpack | OPT_install)) {
1785				/* Try and find a currently installed version of this package */
1786				status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1787				/* If no previous entry was found initialise a new entry */
1788				if (status_hashtable[status_num] == NULL
1789				 || status_hashtable[status_num]->status == 0
1790				) {
1791					status_node = xmalloc(sizeof(status_node_t));
1792					status_node->package = deb_file[deb_count]->package;
1793					/* reinstreq isnt changed to "ok" until the package control info
1794					 * is written to the status file*/
1795					status_node->status = search_name_hashtable("install reinstreq not-installed");
1796					status_hashtable[status_num] = status_node;
1797				} else {
1798					set_status(status_num, "install", 1);
1799					set_status(status_num, "reinstreq", 2);
1800				}
1801			}
1802		} else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1803			/* -C/-p/-r: require package name */
1804			deb_file[deb_count]->package = search_package_hashtable(
1805					search_name_hashtable(argv[0]),
1806					search_name_hashtable("ANY"), VER_ANY);
1807			if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1808				bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1809			}
1810			package_num = deb_file[deb_count]->package;
1811			status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1812			state_status = get_status(status_num, 3);
1813
1814			/* check package status is "installed" */
1815			if (opt & OPT_remove) {
1816				if (strcmp(name_hashtable[state_status], "not-installed") == 0
1817				 || strcmp(name_hashtable[state_status], "config-files") == 0
1818				) {
1819					bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1820				}
1821				set_status(status_num, "deinstall", 1);
1822			} else if (opt & OPT_purge) {
1823				/* if package status is "conf-files" then its ok */
1824				if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1825					bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1826				}
1827				set_status(status_num, "purge", 1);
1828			}
1829		}
1830		deb_count++;
1831		argv++;
1832	}
1833	if (!deb_count)
1834		bb_error_msg_and_die("no package files specified");
1835	deb_file[deb_count] = NULL;
1836
1837	/* Check that the deb file arguments are installable */
1838	if (!(opt & OPT_force_ignore_depends)) {
1839		if (!check_deps(deb_file, 0 /*, deb_count*/)) {
1840			bb_error_msg_and_die("dependency check failed");
1841		}
1842	}
1843
1844	/* TODO: install or remove packages in the correct dependency order */
1845	for (i = 0; i < deb_count; i++) {
1846		/* Remove or purge packages */
1847		if (opt & OPT_remove) {
1848			remove_package(deb_file[i]->package, 1);
1849		}
1850		else if (opt & OPT_purge) {
1851			purge_package(deb_file[i]->package);
1852		}
1853		else if (opt & OPT_unpack) {
1854			unpack_package(deb_file[i]);
1855		}
1856		else if (opt & OPT_install) {
1857			unpack_package(deb_file[i]);
1858			/* package is configured in second pass below */
1859		}
1860		else if (opt & OPT_configure) {
1861			configure_package(deb_file[i]);
1862		}
1863	}
1864	/* configure installed packages */
1865	if (opt & OPT_install) {
1866		for (i = 0; i < deb_count; i++)
1867			configure_package(deb_file[i]);
1868	}
1869
1870	write_status_file(deb_file);
1871
1872	if (ENABLE_FEATURE_CLEAN_UP) {
1873		for (i = 0; i < deb_count; i++) {
1874			free(deb_file[i]->control_file);
1875			free(deb_file[i]->filename);
1876			free(deb_file[i]);
1877		}
1878
1879		free(deb_file);
1880
1881		for (i = 0; i < NAME_HASH_PRIME; i++) {
1882			free(name_hashtable[i]);
1883		}
1884
1885		for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1886			free_package(package_hashtable[i]);
1887		}
1888
1889		for (i = 0; i < STATUS_HASH_PRIME; i++) {
1890			free(status_hashtable[i]);
1891		}
1892
1893		free(status_hashtable);
1894		free(package_hashtable);
1895		free(name_hashtable);
1896	}
1897
1898	return EXIT_SUCCESS;
1899}
1900