source: branches/3.2/mindi-busybox/archival/dpkg.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 59.0 KB
Line 
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 source tree.
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//usage:#define dpkg_trivial_usage
32//usage:       "[-ilCPru] [-F OPT] PACKAGE"
33//usage:#define dpkg_full_usage "\n\n"
34//usage:       "Install, remove and manage Debian packages\n"
35//usage:    IF_LONG_OPTS(
36//usage:     "\n    -i,--install    Install the package"
37//usage:     "\n    -l,--list   List of installed packages"
38//usage:     "\n    --configure Configure an unpackaged package"
39//usage:     "\n    -P,--purge  Purge all files of a package"
40//usage:     "\n    -r,--remove Remove all but the configuration files for a package"
41//usage:     "\n    --unpack    Unpack a package, but don't configure it"
42//usage:     "\n    --force-depends Ignore dependency problems"
43//usage:     "\n    --force-confnew Overwrite existing config files when installing"
44//usage:     "\n    --force-confold Keep old config files when installing"
45//usage:    )
46//usage:    IF_NOT_LONG_OPTS(
47//usage:     "\n    -i      Install the package"
48//usage:     "\n    -l      List of installed packages"
49//usage:     "\n    -C      Configure an unpackaged package"
50//usage:     "\n    -P      Purge all files of a package"
51//usage:     "\n    -r      Remove all but the configuration files for a package"
52//usage:     "\n    -u      Unpack a package, but don't configure it"
53//usage:     "\n    -F depends  Ignore dependency problems"
54//usage:     "\n    -F confnew  Overwrite existing config files when installing"
55//usage:     "\n    -F confold  Keep old config files when installing"
56//usage:    )
57
58#include "libbb.h"
59#include <fnmatch.h>
60#include "bb_archive.h"
61
62/* note: if you vary hash_prime sizes be aware,
63 * 1) tweaking these will have a big effect on how much memory this program uses.
64 * 2) for computational efficiency these hash tables should be at least 20%
65 *    larger than the maximum number of elements stored in it.
66 * 3) all _hash_prime's must be a prime number or chaos is assured, if your looking
67 *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
68 * 4) if you go bigger than 15 bits you may get into trouble (untested) as its
69 *    sometimes cast to an unsigned, if you go to 16 bit you will overlap
70 *    int's and chaos is assured, 16381 is the max prime for 14 bit field
71 */
72
73/* NAME_HASH_PRIME, Stores package names and versions,
74 * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
75 * as there a lot of duplicate version numbers */
76#define NAME_HASH_PRIME 16381
77
78/* PACKAGE_HASH_PRIME, Maximum number of unique packages,
79 * It must not be smaller than STATUS_HASH_PRIME,
80 * Currently only packages from status_hashtable are stored in here, but in
81 * future this may be used to store packages not only from a status file,
82 * but an available_hashtable, and even multiple packages files.
83 * Package can be stored more than once if they have different versions.
84 * e.g. The same package may have different versions in the status file
85 *      and available file */
86#define PACKAGE_HASH_PRIME 10007
87typedef struct edge_s {
88    unsigned operator:4; /* was:3 */
89    unsigned type:4;
90    unsigned name:16; /* was:14 */
91    unsigned version:16; /* was:14 */
92} edge_t;
93
94typedef struct common_node_s {
95    unsigned name:16; /* was:14 */
96    unsigned version:16; /* was:14 */
97    unsigned num_of_edges:16; /* was:14 */
98    edge_t **edge;
99} common_node_t;
100
101/* Currently it doesnt store packages that have state-status of not-installed
102 * So it only really has to be the size of the maximum number of packages
103 * likely to be installed at any one time, so there is a bit of leeway here */
104#define STATUS_HASH_PRIME 8191
105typedef struct status_node_s {
106    unsigned package:16; /* was:14 */       /* has to fit PACKAGE_HASH_PRIME */
107    unsigned status:16; /* was:14 */        /* has to fit STATUS_HASH_PRIME */
108} status_node_t;
109
110
111/* Globals */
112struct globals {
113    char          *name_hashtable[NAME_HASH_PRIME + 1];
114    common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
115    status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
116};
117#define G (*ptr_to_globals)
118#define name_hashtable    (G.name_hashtable   )
119#define package_hashtable (G.package_hashtable)
120#define status_hashtable  (G.status_hashtable )
121#define INIT_G() do { \
122    SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
123} while (0)
124
125
126/* Even numbers are for 'extras', like ored dependencies or null */
127enum edge_type_e {
128    EDGE_NULL = 0,
129    EDGE_PRE_DEPENDS = 1,
130    EDGE_OR_PRE_DEPENDS = 2,
131    EDGE_DEPENDS = 3,
132    EDGE_OR_DEPENDS = 4,
133    EDGE_REPLACES = 5,
134    EDGE_PROVIDES = 7,
135    EDGE_CONFLICTS = 9,
136    EDGE_SUGGESTS = 11,
137    EDGE_RECOMMENDS = 13,
138    EDGE_ENHANCES = 15
139};
140enum operator_e {
141    VER_NULL = 0,
142    VER_EQUAL = 1,
143    VER_LESS = 2,
144    VER_LESS_EQUAL = 3,
145    VER_MORE = 4,
146    VER_MORE_EQUAL = 5,
147    VER_ANY = 6
148};
149
150typedef struct deb_file_s {
151    char *control_file;
152    char *filename;
153    unsigned package:16; /* was:14 */
154} deb_file_t;
155
156
157static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
158{
159    unsigned long hash_num = key[0];
160    int len = strlen(key);
161    int i;
162
163    /* Maybe i should have uses a "proper" hashing algorithm here instead
164     * of making one up myself, seems to be working ok though. */
165    for (i = 1; i < len; i++) {
166        /* shifts the ascii based value and adds it to previous value
167         * shift amount is mod 24 because long int is 32 bit and data
168         * to be shifted is 8, don't want to shift data to where it has
169         * no effect */
170        hash_num += (key[i] + key[i-1]) << ((key[i] * i) % 24);
171    }
172    *start = (unsigned) hash_num % hash_prime;
173    *decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
174}
175
176/* this adds the key to the hash table */
177static int search_name_hashtable(const char *key)
178{
179    unsigned probe_address;
180    unsigned probe_decrement;
181
182    make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
183    while (name_hashtable[probe_address] != NULL) {
184        if (strcmp(name_hashtable[probe_address], key) == 0) {
185            return probe_address;
186        }
187        probe_address -= probe_decrement;
188        if ((int)probe_address < 0) {
189            probe_address += NAME_HASH_PRIME;
190        }
191    }
192    name_hashtable[probe_address] = xstrdup(key);
193    return probe_address;
194}
195
196/* this DOESNT add the key to the hashtable
197 * TODO make it consistent with search_name_hashtable
198 */
199static unsigned search_status_hashtable(const char *key)
200{
201    unsigned probe_address;
202    unsigned probe_decrement;
203
204    make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
205    while (status_hashtable[probe_address] != NULL) {
206        if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
207            break;
208        }
209        probe_address -= probe_decrement;
210        if ((int)probe_address < 0) {
211            probe_address += STATUS_HASH_PRIME;
212        }
213    }
214    return probe_address;
215}
216
217static int order(char x)
218{
219    return (x == '~' ? -1
220        : x == '\0' ? 0
221        : isdigit(x) ? 0
222        : isalpha(x) ? x
223        : (unsigned char)x + 256
224    );
225}
226
227/* This code is taken from dpkg and modified slightly to work with busybox */
228static int version_compare_part(const char *val, const char *ref)
229{
230    if (!val) val = "";
231    if (!ref) ref = "";
232
233    while (*val || *ref) {
234        int first_diff;
235
236        while ((*val && !isdigit(*val)) || (*ref && !isdigit(*ref))) {
237            int vc = order(*val);
238            int rc = order(*ref);
239            if (vc != rc)
240                return vc - rc;
241            val++;
242            ref++;
243        }
244
245        while (*val == '0')
246            val++;
247        while (*ref == '0')
248            ref++;
249
250        first_diff = 0;
251        while (isdigit(*val) && isdigit(*ref)) {
252            if (first_diff == 0)
253                first_diff = *val - *ref;
254            val++;
255            ref++;
256        }
257        if (isdigit(*val))
258            return 1;
259        if (isdigit(*ref))
260            return -1;
261        if (first_diff)
262            return first_diff;
263    }
264    return 0;
265}
266
267/* if ver1 < ver2 return -1,
268 * if ver1 = ver2 return 0,
269 * if ver1 > ver2 return 1,
270 */
271static int version_compare(const unsigned ver1, const unsigned ver2)
272{
273    char *ch_ver1 = name_hashtable[ver1];
274    char *ch_ver2 = name_hashtable[ver2];
275    unsigned epoch1 = 0, epoch2 = 0;
276    char *colon;
277    char *deb_ver1, *deb_ver2;
278    char *upstream_ver1;
279    char *upstream_ver2;
280    int result;
281
282    /* Compare epoch */
283    colon = strchr(ch_ver1, ':');
284    if (colon) {
285        epoch1 = atoi(ch_ver1);
286        ch_ver1 = colon + 1;
287    }
288    colon = strchr(ch_ver2, ':');
289    if (colon) {
290        epoch2 = atoi(ch_ver2);
291        ch_ver2 = colon + 1;
292    }
293    if (epoch1 < epoch2) {
294        return -1;
295    }
296    if (epoch1 > epoch2) {
297        return 1;
298    }
299
300    /* Compare upstream version */
301    upstream_ver1 = xstrdup(ch_ver1);
302    upstream_ver2 = xstrdup(ch_ver2);
303
304    /* Chop off debian version, and store for later use */
305    deb_ver1 = strrchr(upstream_ver1, '-');
306    deb_ver2 = strrchr(upstream_ver2, '-');
307    if (deb_ver1) {
308        *deb_ver1++ = '\0';
309    }
310    if (deb_ver2) {
311        *deb_ver2++ = '\0';
312    }
313    result = version_compare_part(upstream_ver1, upstream_ver2);
314    if (result == 0) {
315        /* Compare debian versions */
316        result = version_compare_part(deb_ver1, deb_ver2);
317    }
318
319    free(upstream_ver1);
320    free(upstream_ver2);
321    return result;
322}
323
324static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
325{
326    const int version_result = version_compare(version1, version2);
327    switch (operator) {
328    case VER_ANY:
329        return TRUE;
330    case VER_EQUAL:
331        return (version_result == 0);
332    case VER_LESS:
333        return (version_result < 0);
334    case VER_LESS_EQUAL:
335        return (version_result <= 0);
336    case VER_MORE:
337        return (version_result > 0);
338    case VER_MORE_EQUAL:
339        return (version_result >= 0);
340    }
341    return FALSE;
342}
343
344static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
345{
346    unsigned probe_address;
347    unsigned probe_decrement;
348
349    make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
350    while (package_hashtable[probe_address] != NULL) {
351        if (package_hashtable[probe_address]->name == name) {
352            if (operator == VER_ANY) {
353                return probe_address;
354            }
355            if (test_version(package_hashtable[probe_address]->version, version, operator)) {
356                return probe_address;
357            }
358        }
359        probe_address -= probe_decrement;
360        if ((int)probe_address < 0) {
361            probe_address += PACKAGE_HASH_PRIME;
362        }
363    }
364    return probe_address;
365}
366
367/*
368 * This function searches through the entire package_hashtable looking
369 * for a package which provides "needle". It returns the index into
370 * the package_hashtable for the providing package.
371 *
372 * needle is the index into name_hashtable of the package we are
373 * looking for.
374 *
375 * start_at is the index in the package_hashtable to start looking
376 * at. If start_at is -1 then start at the beginning. This is to allow
377 * for repeated searches since more than one package might provide
378 * needle.
379 *
380 * FIXME: I don't think this is very efficient, but I thought I'd keep
381 * it simple for now until it proves to be a problem.
382 */
383static int search_for_provides(int needle, int start_at)
384{
385    int i, j;
386    common_node_t *p;
387    for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
388        p = package_hashtable[i];
389        if (p == NULL)
390            continue;
391        for (j = 0; j < p->num_of_edges; j++)
392            if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
393                return i;
394    }
395    return -1;
396}
397
398/*
399 * Add an edge to a node
400 */
401static void add_edge_to_node(common_node_t *node, edge_t *edge)
402{
403    node->edge = xrealloc_vector(node->edge, 2, node->num_of_edges);
404    node->edge[node->num_of_edges++] = edge;
405}
406
407/*
408 * Create one new node and one new edge for every dependency.
409 *
410 * Dependencies which contain multiple alternatives are represented as
411 * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
412 * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
413 * the OR edge contains the full dependency string while the version
414 * field contains the number of EDGE nodes which follow as part of
415 * this alternative.
416 */
417static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
418{
419    char *line = xstrdup(whole_line);
420    char *line2;
421    char *line_ptr1 = NULL;
422    char *line_ptr2 = NULL;
423    char *field;
424    char *field2;
425    char *version;
426    edge_t *edge;
427    edge_t *or_edge;
428    int offset_ch;
429
430    field = strtok_r(line, ",", &line_ptr1);
431    do {
432        /* skip leading spaces */
433        field += strspn(field, " ");
434        line2 = xstrdup(field);
435        field2 = strtok_r(line2, "|", &line_ptr2);
436        or_edge = NULL;
437        if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
438         && (strcmp(field, field2) != 0)
439        ) {
440            or_edge = xzalloc(sizeof(edge_t));
441            or_edge->type = edge_type + 1;
442            or_edge->name = search_name_hashtable(field);
443            //or_edge->version = 0; // tracks the number of alternatives
444            add_edge_to_node(parent_node, or_edge);
445        }
446
447        do {
448            edge = xmalloc(sizeof(edge_t));
449            edge->type = edge_type;
450
451            /* Skip any extra leading spaces */
452            field2 += strspn(field2, " ");
453
454            /* Get dependency version info */
455            version = strchr(field2, '(');
456            if (version == NULL) {
457                edge->operator = VER_ANY;
458                /* Get the versions hash number, adding it if the number isnt already in there */
459                edge->version = search_name_hashtable("ANY");
460            } else {
461                /* Skip leading ' ' or '(' */
462                version += strspn(version, " (");
463                /* Calculate length of any operator characters */
464                offset_ch = strspn(version, "<=>");
465                /* Determine operator */
466                if (offset_ch > 0) {
467                    if (strncmp(version, "=", offset_ch) == 0) {
468                        edge->operator = VER_EQUAL;
469                    } else if (strncmp(version, "<<", offset_ch) == 0) {
470                        edge->operator = VER_LESS;
471                    } else if (strncmp(version, "<=", offset_ch) == 0) {
472                        edge->operator = VER_LESS_EQUAL;
473                    } else if (strncmp(version, ">>", offset_ch) == 0) {
474                        edge->operator = VER_MORE;
475                    } else if (strncmp(version, ">=", offset_ch) == 0) {
476                        edge->operator = VER_MORE_EQUAL;
477                    } else {
478                        bb_error_msg_and_die("illegal operator");
479                    }
480                }
481                /* skip to start of version numbers */
482                version += offset_ch;
483                version += strspn(version, " ");
484
485                /* Truncate version at trailing ' ' or ')' */
486                version[strcspn(version, " )")] = '\0';
487                /* Get the versions hash number, adding it if the number isnt already in there */
488                edge->version = search_name_hashtable(version);
489            }
490
491            /* Get the dependency name */
492            field2[strcspn(field2, " (")] = '\0';
493            edge->name = search_name_hashtable(field2);
494
495            if (or_edge)
496                or_edge->version++;
497
498            add_edge_to_node(parent_node, edge);
499            field2 = strtok_r(NULL, "|", &line_ptr2);
500        } while (field2 != NULL);
501
502        free(line2);
503        field = strtok_r(NULL, ",", &line_ptr1);
504    } while (field != NULL);
505
506    free(line);
507}
508
509static void free_package(common_node_t *node)
510{
511    unsigned i;
512    if (node) {
513        for (i = 0; i < node->num_of_edges; i++) {
514            free(node->edge[i]);
515        }
516        free(node->edge);
517        free(node);
518    }
519}
520
521/*
522 * Gets the next package field from package_buffer, separated into the field name
523 * and field value, it returns the int offset to the first character of the next field
524 */
525static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
526{
527    int offset_name_start = 0;
528    int offset_name_end = 0;
529    int offset_value_start = 0;
530    int offset_value_end = 0;
531    int offset = 0;
532    int next_offset;
533    int name_length;
534    int value_length;
535    int exit_flag = FALSE;
536
537    if (package_buffer == NULL) {
538        *field_name = NULL;
539        *field_value = NULL;
540        return -1;
541    }
542    while (1) {
543        next_offset = offset + 1;
544        switch (package_buffer[offset]) {
545            case '\0':
546                exit_flag = TRUE;
547                break;
548            case ':':
549                if (offset_name_end == 0) {
550                    offset_name_end = offset;
551                    offset_value_start = next_offset;
552                }
553                /* TODO: Name might still have trailing spaces if ':' isnt
554                 * immediately after name */
555                break;
556            case '\n':
557                /* TODO: The char next_offset may be out of bounds */
558                if (package_buffer[next_offset] != ' ') {
559                    exit_flag = TRUE;
560                    break;
561                }
562            case '\t':
563            case ' ':
564                /* increment the value start point if its a just filler */
565                if (offset_name_start == offset) {
566                    offset_name_start++;
567                }
568                if (offset_value_start == offset) {
569                    offset_value_start++;
570                }
571                break;
572        }
573        if (exit_flag) {
574            /* Check that the names are valid */
575            offset_value_end = offset;
576            name_length = offset_name_end - offset_name_start;
577            value_length = offset_value_end - offset_value_start;
578            if (name_length == 0) {
579                break;
580            }
581            if ((name_length > 0) && (value_length > 0)) {
582                break;
583            }
584
585            /* If not valid, start fresh with next field */
586            exit_flag = FALSE;
587            offset_name_start = offset + 1;
588            offset_name_end = 0;
589            offset_value_start = offset + 1;
590            offset_value_end = offset + 1;
591            offset++;
592        }
593        offset++;
594    }
595    *field_name = NULL;
596    if (name_length) {
597        *field_name = xstrndup(&package_buffer[offset_name_start], name_length);
598    }
599    *field_value = NULL;
600    if (value_length > 0) {
601        *field_value = xstrndup(&package_buffer[offset_value_start], value_length);
602    }
603    return next_offset;
604}
605
606static unsigned fill_package_struct(char *control_buffer)
607{
608    static const char field_names[] ALIGN1 =
609        "Package\0""Version\0"
610        "Pre-Depends\0""Depends\0""Replaces\0""Provides\0"
611        "Conflicts\0""Suggests\0""Recommends\0""Enhances\0";
612
613    common_node_t *new_node = xzalloc(sizeof(common_node_t));
614    char *field_name;
615    char *field_value;
616    int field_start = 0;
617    int num = -1;
618    int buffer_length = strlen(control_buffer);
619
620    new_node->version = search_name_hashtable("unknown");
621    while (field_start < buffer_length) {
622        unsigned field_num;
623
624        field_start += read_package_field(&control_buffer[field_start],
625                &field_name, &field_value);
626
627        if (field_name == NULL) {
628            goto fill_package_struct_cleanup;
629        }
630
631        field_num = index_in_strings(field_names, field_name);
632        switch (field_num) {
633        case 0: /* Package */
634            new_node->name = search_name_hashtable(field_value);
635            break;
636        case 1: /* Version */
637            new_node->version = search_name_hashtable(field_value);
638            break;
639        case 2: /* Pre-Depends */
640            add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
641            break;
642        case 3: /* Depends */
643            add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
644            break;
645        case 4: /* Replaces */
646            add_split_dependencies(new_node, field_value, EDGE_REPLACES);
647            break;
648        case 5: /* Provides */
649            add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
650            break;
651        case 6: /* Conflicts */
652            add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
653            break;
654        case 7: /* Suggests */
655            add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
656            break;
657        case 8: /* Recommends */
658            add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
659            break;
660        case 9: /* Enhances */
661            add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
662            break;
663        }
664 fill_package_struct_cleanup:
665        free(field_name);
666        free(field_value);
667    }
668
669    if (new_node->version == search_name_hashtable("unknown")) {
670        free_package(new_node);
671        return -1;
672    }
673    num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
674    free_package(package_hashtable[num]);
675    package_hashtable[num] = new_node;
676    return num;
677}
678
679/* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
680static unsigned get_status(const unsigned status_node, const int num)
681{
682    char *status_string = name_hashtable[status_hashtable[status_node]->status];
683    char *state_sub_string;
684    unsigned state_sub_num;
685    int len;
686    int i;
687
688    /* set tmp_string to point to the start of the word number */
689    for (i = 1; i < num; i++) {
690        /* skip past a word */
691        status_string += strcspn(status_string, " ");
692        /* skip past the separating spaces */
693        status_string += strspn(status_string, " ");
694    }
695    len = strcspn(status_string, " \n");
696    state_sub_string = xstrndup(status_string, len);
697    state_sub_num = search_name_hashtable(state_sub_string);
698    free(state_sub_string);
699    return state_sub_num;
700}
701
702static void set_status(const unsigned status_node_num, const char *new_value, const int position)
703{
704    const unsigned new_value_num = search_name_hashtable(new_value);
705    unsigned want = get_status(status_node_num, 1);
706    unsigned flag = get_status(status_node_num, 2);
707    unsigned status = get_status(status_node_num, 3);
708    char *new_status;
709
710    switch (position) {
711        case 1:
712            want = new_value_num;
713            break;
714        case 2:
715            flag = new_value_num;
716            break;
717        case 3:
718            status = new_value_num;
719            break;
720        default:
721            bb_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
722    }
723
724    new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
725    status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
726    free(new_status);
727}
728
729static const char *describe_status(int status_num)
730{
731    int status_want, status_state;
732    if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
733        return "is not installed or flagged to be installed";
734
735    status_want = get_status(status_num, 1);
736    status_state = get_status(status_num, 3);
737
738    if (status_state == search_name_hashtable("installed")) {
739        if (status_want == search_name_hashtable("install"))
740            return "is installed";
741        if (status_want == search_name_hashtable("deinstall"))
742            return "is marked to be removed";
743        if (status_want == search_name_hashtable("purge"))
744            return "is marked to be purged";
745    }
746    if (status_want == search_name_hashtable("unknown"))
747        return "is in an indeterminate state";
748    if (status_want == search_name_hashtable("install"))
749        return "is marked to be installed";
750
751    return "is not installed or flagged to be installed";
752}
753
754static void index_status_file(const char *filename)
755{
756    FILE *status_file;
757    char *control_buffer;
758    char *status_line;
759    status_node_t *status_node = NULL;
760    unsigned status_num;
761
762    status_file = xfopen_for_read(filename);
763    while ((control_buffer = xmalloc_fgetline_str(status_file, "\n\n")) != NULL) {
764        const unsigned package_num = fill_package_struct(control_buffer);
765        if (package_num != -1) {
766            status_node = xmalloc(sizeof(status_node_t));
767            /* fill_package_struct doesnt handle the status field */
768            status_line = strstr(control_buffer, "Status:");
769            if (status_line != NULL) {
770                status_line += 7;
771                status_line += strspn(status_line, " \n\t");
772                status_line = xstrndup(status_line, strcspn(status_line, "\n"));
773                status_node->status = search_name_hashtable(status_line);
774                free(status_line);
775            }
776            status_node->package = package_num;
777            status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
778            status_hashtable[status_num] = status_node;
779        }
780        free(control_buffer);
781    }
782    fclose(status_file);
783}
784
785static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
786{
787    char *name;
788    char *value;
789    int start = 0;
790    while (1) {
791        start += read_package_field(&control_buffer[start], &name, &value);
792        if (name == NULL) {
793            break;
794        }
795        if (strcmp(name, "Status") != 0) {
796            fprintf(new_status_file, "%s: %s\n", name, value);
797        }
798    }
799}
800
801/* This could do with a cleanup */
802static void write_status_file(deb_file_t **deb_file)
803{
804    FILE *old_status_file = xfopen_for_read("/var/lib/dpkg/status");
805    FILE *new_status_file = xfopen_for_write("/var/lib/dpkg/status.udeb");
806    char *package_name;
807    char *status_from_file;
808    char *control_buffer = NULL;
809    char *tmp_string;
810    int status_num;
811    int field_start = 0;
812    int write_flag;
813    int i = 0;
814
815    /* Update previously known packages */
816    while ((control_buffer = xmalloc_fgetline_str(old_status_file, "\n\n")) != NULL) {
817        tmp_string = strstr(control_buffer, "Package:");
818        if (tmp_string == NULL) {
819            continue;
820        }
821
822        tmp_string += 8;
823        tmp_string += strspn(tmp_string, " \n\t");
824        package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
825        write_flag = FALSE;
826        tmp_string = strstr(control_buffer, "Status:");
827        if (tmp_string != NULL) {
828            /* Separate the status value from the control buffer */
829            tmp_string += 7;
830            tmp_string += strspn(tmp_string, " \n\t");
831            status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
832        } else {
833            status_from_file = NULL;
834        }
835
836        /* Find this package in the status hashtable */
837        status_num = search_status_hashtable(package_name);
838        if (status_hashtable[status_num] != NULL) {
839            const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
840            if (strcmp(status_from_file, status_from_hashtable) != 0) {
841                /* New status isnt exactly the same as old status */
842                const int state_status = get_status(status_num, 3);
843                if ((strcmp("installed", name_hashtable[state_status]) == 0)
844                 || (strcmp("unpacked", name_hashtable[state_status]) == 0)
845                ) {
846                    /* We need to add the control file from the package */
847                    i = 0;
848                    while (deb_file[i] != NULL) {
849                        if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
850                            /* Write a status file entry with a modified status */
851                            /* remove trailing \n's */
852                            write_buffer_no_status(new_status_file, deb_file[i]->control_file);
853                            set_status(status_num, "ok", 2);
854                            fprintf(new_status_file, "Status: %s\n\n",
855                                    name_hashtable[status_hashtable[status_num]->status]);
856                            write_flag = TRUE;
857                            break;
858                        }
859                        i++;
860                    }
861                    /* This is temperary, debugging only */
862                    if (deb_file[i] == NULL) {
863                        bb_error_msg_and_die("ALERT: cannot find a control file, "
864                            "your status file may be broken, status may be "
865                            "incorrect for %s", package_name);
866                    }
867                }
868                else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
869                    /* Only write the Package, Status, Priority and Section lines */
870                    fprintf(new_status_file, "Package: %s\n", package_name);
871                    fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
872
873                    while (1) {
874                        char *field_name;
875                        char *field_value;
876                        field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
877                        if (field_name == NULL) {
878                            break;
879                        }
880                        if ((strcmp(field_name, "Priority") == 0)
881                         || (strcmp(field_name, "Section") == 0)
882                        ) {
883                            fprintf(new_status_file, "%s: %s\n", field_name, field_value);
884                        }
885                    }
886                    write_flag = TRUE;
887                    fputs("\n", new_status_file);
888                }
889                else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
890                    /* only change the status line */
891                    while (1) {
892                        char *field_name;
893                        char *field_value;
894                        field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
895                        if (field_name == NULL) {
896                            break;
897                        }
898                        /* Setup start point for next field */
899                        if (strcmp(field_name, "Status") == 0) {
900                            fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
901                        } else {
902                            fprintf(new_status_file, "%s: %s\n", field_name, field_value);
903                        }
904                    }
905                    write_flag = TRUE;
906                    fputs("\n", new_status_file);
907                }
908            }
909        }
910        /* If the package from the status file wasnt handle above, do it now*/
911        if (!write_flag) {
912            fprintf(new_status_file, "%s\n\n", control_buffer);
913        }
914
915        free(status_from_file);
916        free(package_name);
917        free(control_buffer);
918    }
919
920    /* Write any new packages */
921    for (i = 0; deb_file[i] != NULL; i++) {
922        status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
923        if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
924            write_buffer_no_status(new_status_file, deb_file[i]->control_file);
925            set_status(status_num, "ok", 2);
926            fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
927        }
928    }
929    fclose(old_status_file);
930    fclose(new_status_file);
931
932    /* Create a separate backfile to dpkg */
933    if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
934        if (errno != ENOENT)
935            bb_error_msg_and_die("can't create backup status file");
936        /* Its ok if renaming the status file fails because status
937         * file doesnt exist, maybe we are starting from scratch */
938        bb_error_msg("no status file found, creating new one");
939    }
940
941    xrename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status");
942}
943
944/* This function returns TRUE if the given package can satisfy a
945 * dependency of type depend_type.
946 *
947 * A pre-depends is satisfied only if a package is already installed,
948 * which a regular depends can be satisfied by a package which we want
949 * to install.
950 */
951static int package_satisfies_dependency(int package, int depend_type)
952{
953    int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
954
955    /* status could be unknown if package is a pure virtual
956     * provides which cannot satisfy any dependency by itself.
957     */
958    if (status_hashtable[status_num] == NULL)
959        return 0;
960
961    switch (depend_type) {
962    case EDGE_PRE_DEPENDS: return get_status(status_num, 3) == search_name_hashtable("installed");
963    case EDGE_DEPENDS:     return get_status(status_num, 1) == search_name_hashtable("install");
964    }
965    return 0;
966}
967
968static int check_deps(deb_file_t **deb_file, int deb_start /*, int dep_max_count - ?? */)
969{
970    int *conflicts = NULL;
971    int conflicts_num = 0;
972    int i = deb_start;
973    int j;
974
975    /* Check for conflicts
976     * TODO: TEST if conflicts with other packages to be installed
977     *
978     * Add install packages and the packages they provide
979     * to the list of files to check conflicts for
980     */
981
982    /* Create array of package numbers to check against
983     * installed package for conflicts*/
984    while (deb_file[i] != NULL) {
985        const unsigned package_num = deb_file[i]->package;
986        conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
987        conflicts[conflicts_num] = package_num;
988        conflicts_num++;
989        /* add provides to conflicts list */
990        for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
991            if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
992                const int conflicts_package_num = search_package_hashtable(
993                    package_hashtable[package_num]->edge[j]->name,
994                    package_hashtable[package_num]->edge[j]->version,
995                    package_hashtable[package_num]->edge[j]->operator);
996                if (package_hashtable[conflicts_package_num] == NULL) {
997                    /* create a new package */
998                    common_node_t *new_node = xzalloc(sizeof(common_node_t));
999                    new_node->name = package_hashtable[package_num]->edge[j]->name;
1000                    new_node->version = package_hashtable[package_num]->edge[j]->version;
1001                    package_hashtable[conflicts_package_num] = new_node;
1002                }
1003                conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
1004                conflicts[conflicts_num] = conflicts_package_num;
1005                conflicts_num++;
1006            }
1007        }
1008        i++;
1009    }
1010
1011    /* Check conflicts */
1012    i = 0;
1013    while (deb_file[i] != NULL) {
1014        const common_node_t *package_node = package_hashtable[deb_file[i]->package];
1015        int status_num = 0;
1016        status_num = search_status_hashtable(name_hashtable[package_node->name]);
1017
1018        if (get_status(status_num, 3) == search_name_hashtable("installed")) {
1019            i++;
1020            continue;
1021        }
1022
1023        for (j = 0; j < package_node->num_of_edges; j++) {
1024            const edge_t *package_edge = package_node->edge[j];
1025
1026            if (package_edge->type == EDGE_CONFLICTS) {
1027                const unsigned package_num =
1028                    search_package_hashtable(package_edge->name,
1029                                package_edge->version,
1030                                package_edge->operator);
1031                int result = 0;
1032                if (package_hashtable[package_num] != NULL) {
1033                    status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1034
1035                    if (get_status(status_num, 1) == search_name_hashtable("install")) {
1036                        result = test_version(package_hashtable[deb_file[i]->package]->version,
1037                            package_edge->version, package_edge->operator);
1038                    }
1039                }
1040
1041                if (result) {
1042                    bb_error_msg_and_die("package %s conflicts with %s",
1043                        name_hashtable[package_node->name],
1044                        name_hashtable[package_edge->name]);
1045                }
1046            }
1047        }
1048        i++;
1049    }
1050
1051
1052    /* Check dependendcies */
1053    for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1054        int status_num = 0;
1055        int number_of_alternatives = 0;
1056        const edge_t * root_of_alternatives = NULL;
1057        const common_node_t *package_node = package_hashtable[i];
1058
1059        /* If the package node does not exist then this
1060         * package is a virtual one. In which case there are
1061         * no dependencies to check.
1062         */
1063        if (package_node == NULL) continue;
1064
1065        status_num = search_status_hashtable(name_hashtable[package_node->name]);
1066
1067        /* If there is no status then this package is a
1068         * virtual one provided by something else. In which
1069         * case there are no dependencies to check.
1070         */
1071        if (status_hashtable[status_num] == NULL) continue;
1072
1073        /* If we don't want this package installed then we may
1074         * as well ignore it's dependencies.
1075         */
1076        if (get_status(status_num, 1) != search_name_hashtable("install")) {
1077            continue;
1078        }
1079
1080        /* This code is tested only for EDGE_DEPENDS, since I
1081         * have no suitable pre-depends available. There is no
1082         * reason that it shouldn't work though :-)
1083         */
1084        for (j = 0; j < package_node->num_of_edges; j++) {
1085            const edge_t *package_edge = package_node->edge[j];
1086            unsigned package_num;
1087
1088            if (package_edge->type == EDGE_OR_PRE_DEPENDS
1089             || package_edge->type == EDGE_OR_DEPENDS
1090            ) {
1091                /* start an EDGE_OR_ list */
1092                number_of_alternatives = package_edge->version;
1093                root_of_alternatives = package_edge;
1094                continue;
1095            }
1096            if (number_of_alternatives == 0) {  /* not in the middle of an EDGE_OR_ list */
1097                number_of_alternatives = 1;
1098                root_of_alternatives = NULL;
1099            }
1100
1101            package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1102
1103            if (package_edge->type == EDGE_PRE_DEPENDS
1104             || package_edge->type == EDGE_DEPENDS
1105            ) {
1106                int result=1;
1107                status_num = 0;
1108
1109                /* If we are inside an alternative then check
1110                 * this edge is the right type.
1111                 *
1112                 * EDGE_DEPENDS == OR_DEPENDS -1
1113                 * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1114                 */
1115                if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1116                    bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1117                            package_edge->type, root_of_alternatives->type);
1118
1119                if (package_hashtable[package_num] != NULL)
1120                    result = !package_satisfies_dependency(package_num, package_edge->type);
1121
1122                if (result) { /* check for other package which provide what we are looking for */
1123                    int provider = -1;
1124
1125                    while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1126                        if (package_hashtable[provider] == NULL) {
1127                            puts("Have a provider but no package information for it");
1128                            continue;
1129                        }
1130                        result = !package_satisfies_dependency(provider, package_edge->type);
1131
1132                        if (result == 0)
1133                            break;
1134                    }
1135                }
1136
1137                /* It must be already installed, or to be installed */
1138                number_of_alternatives--;
1139                if (result && number_of_alternatives == 0) {
1140                    if (root_of_alternatives)
1141                        bb_error_msg_and_die(
1142                            "package %s %sdepends on %s, "
1143                            "which cannot be satisfied",
1144                            name_hashtable[package_node->name],
1145                            package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1146                            name_hashtable[root_of_alternatives->name]);
1147                    bb_error_msg_and_die(
1148                        "package %s %sdepends on %s, which %s\n",
1149                        name_hashtable[package_node->name],
1150                        package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1151                        name_hashtable[package_edge->name],
1152                        describe_status(status_num));
1153                }
1154                if (result == 0 && number_of_alternatives) {
1155                    /* we've found a package which
1156                     * satisfies the dependency,
1157                     * so skip over the rest of
1158                     * the alternatives.
1159                     */
1160                    j += number_of_alternatives;
1161                    number_of_alternatives = 0;
1162                }
1163            }
1164        }
1165    }
1166    free(conflicts);
1167    return TRUE;
1168}
1169
1170static char **create_list(const char *filename)
1171{
1172    FILE *list_stream;
1173    char **file_list;
1174    char *line;
1175    int count;
1176
1177    /* don't use [xw]fopen here, handle error ourself */
1178    list_stream = fopen_for_read(filename);
1179    if (list_stream == NULL) {
1180        return NULL;
1181    }
1182
1183    file_list = NULL;
1184    count = 0;
1185    while ((line = xmalloc_fgetline(list_stream)) != NULL) {
1186        file_list = xrealloc_vector(file_list, 2, count);
1187        file_list[count++] = line;
1188        /*file_list[count] = NULL; - xrealloc_vector did it */
1189    }
1190    fclose(list_stream);
1191
1192    return file_list;
1193}
1194
1195/* maybe i should try and hook this into remove_file.c somehow */
1196static int remove_file_array(char **remove_names, char **exclude_names)
1197{
1198    struct stat path_stat;
1199    int remove_flag = 1; /* not removed anything yet */
1200    int i, j;
1201
1202    if (remove_names == NULL) {
1203        return 0;
1204    }
1205    for (i = 0; remove_names[i] != NULL; i++) {
1206        if (exclude_names != NULL) {
1207            for (j = 0; exclude_names[j] != NULL; j++) {
1208                if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1209                    goto skip;
1210                }
1211            }
1212        }
1213        /* TODO: why we are checking lstat? we can just try rm/rmdir */
1214        if (lstat(remove_names[i], &path_stat) < 0) {
1215            continue;
1216        }
1217        if (S_ISDIR(path_stat.st_mode)) {
1218            remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
1219        } else {
1220            remove_flag &= unlink(remove_names[i]); /* 0 if no error */
1221        }
1222 skip:
1223        continue;
1224    }
1225    return (remove_flag == 0);
1226}
1227
1228static void run_package_script_or_die(const char *package_name, const char *script_type)
1229{
1230    char *script_path;
1231    int result;
1232
1233    script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1234
1235    /* If the file doesnt exist is isnt fatal */
1236    result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
1237    free(script_path);
1238    if (result)
1239        bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
1240}
1241
1242/*
1243The policy manual defines what scripts get called when and with
1244what arguments. I realize that busybox does not support all of
1245these scenarios, but it does support some of them; it does not,
1246however, run them with any parameters in run_package_script_or_die().
1247Here are the scripts:
1248
1249preinst install
1250preinst install <old_version>
1251preinst upgrade <old_version>
1252preinst abort_upgrade <new_version>
1253postinst configure <most_recent_version>
1254postinst abort-upgade <new_version>
1255postinst abort-remove
1256postinst abort-remove in-favour <package> <version>
1257postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
1258prerm remove
1259prerm upgrade <new_version>
1260prerm failed-upgrade <old_version>
1261prerm remove in-favor <package> <new_version>
1262prerm deconfigure in-favour <package> <version> removing <package> <version>
1263postrm remove
1264postrm purge
1265postrm upgrade <new_version>
1266postrm failed-upgrade <old_version>
1267postrm abort-install
1268postrm abort-install <old_version>
1269postrm abort-upgrade <old_version>
1270postrm disappear <overwriter> <version>
1271*/
1272static const char *const all_control_files[] = {
1273    "preinst", "postinst", "prerm", "postrm",
1274    "list", "md5sums", "shlibs", "conffiles",
1275    "config", "templates"
1276};
1277
1278static char **all_control_list(const char *package_name)
1279{
1280    unsigned i = 0;
1281    char **remove_files;
1282
1283    /* Create a list of all /var/lib/dpkg/info/<package> files */
1284    remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
1285    while (i < ARRAY_SIZE(all_control_files)) {
1286        remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
1287                package_name, all_control_files[i]);
1288        i++;
1289    }
1290
1291    return remove_files;
1292}
1293
1294static void free_array(char **array)
1295{
1296    if (array) {
1297        unsigned i = 0;
1298        while (array[i]) {
1299            free(array[i]);
1300            i++;
1301        }
1302        free(array);
1303    }
1304}
1305
1306/* This function lists information on the installed packages. It loops through
1307 * the status_hashtable to retrieve the info. This results in smaller code than
1308 * scanning the status file. The resulting list, however, is unsorted.
1309 */
1310static void list_packages(const char *pattern)
1311{
1312    int i;
1313
1314    puts("    Name           Version");
1315    puts("+++-==============-==============");
1316
1317    /* go through status hash, dereference package hash and finally strings */
1318    for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
1319        if (status_hashtable[i]) {
1320            const char *stat_str;  /* status string */
1321            const char *name_str;  /* package name */
1322            const char *vers_str;  /* version */
1323            char  s1, s2;          /* status abbreviations */
1324            int   spccnt;          /* space count */
1325            int   j;
1326
1327            stat_str = name_hashtable[status_hashtable[i]->status];
1328            name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1329            vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1330
1331            if (pattern && fnmatch(pattern, name_str, 0) != 0)
1332                continue;
1333
1334            /* get abbreviation for status field 1 */
1335            s1 = stat_str[0] == 'i' ? 'i' : 'r';
1336
1337            /* get abbreviation for status field 2 */
1338            for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
1339                if (stat_str[j] == ' ') spccnt++;
1340            }
1341            s2 = stat_str[j];
1342
1343            /* print out the line formatted like Debian dpkg */
1344            printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1345        }
1346    }
1347}
1348
1349static void remove_package(const unsigned package_num, int noisy)
1350{
1351    const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1352    const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1353    const unsigned status_num = search_status_hashtable(package_name);
1354    const int package_name_length = strlen(package_name);
1355    char **remove_files;
1356    char **exclude_files;
1357    char list_name[package_name_length + 25];
1358    char conffile_name[package_name_length + 30];
1359
1360    if (noisy)
1361        printf("Removing %s (%s)...\n", package_name, package_version);
1362
1363    /* Run prerm script */
1364    run_package_script_or_die(package_name, "prerm");
1365
1366    /* Create a list of files to remove, and a separate list of those to keep */
1367    sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1368    remove_files = create_list(list_name);
1369
1370    sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
1371    exclude_files = create_list(conffile_name);
1372
1373    /* Some directories can't be removed straight away, so do multiple passes */
1374    while (remove_file_array(remove_files, exclude_files))
1375        continue;
1376    free_array(exclude_files);
1377    free_array(remove_files);
1378
1379    /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep */
1380    exclude_files = xzalloc(sizeof(exclude_files[0]) * 3);
1381    exclude_files[0] = xstrdup(conffile_name);
1382    exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1383
1384    /* Create a list of all /var/lib/dpkg/info/<package> files */
1385    remove_files = all_control_list(package_name);
1386
1387    remove_file_array(remove_files, exclude_files);
1388    free_array(remove_files);
1389    free_array(exclude_files);
1390
1391    /* rename <package>.conffiles to <package>.list
1392     * The conffiles control file isn't required in Debian packages, so don't
1393     * error out if it's missing.  */
1394    rename(conffile_name, list_name);
1395
1396    /* Change package status */
1397    set_status(status_num, "config-files", 3);
1398}
1399
1400static void purge_package(const unsigned package_num)
1401{
1402    const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1403    const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1404    const unsigned status_num = search_status_hashtable(package_name);
1405    char **remove_files;
1406    char **exclude_files;
1407    char list_name[strlen(package_name) + 25];
1408
1409    printf("Purging %s (%s)...\n", package_name, package_version);
1410
1411    /* Run prerm script */
1412    run_package_script_or_die(package_name, "prerm");
1413
1414    /* Create a list of files to remove */
1415    sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1416    remove_files = create_list(list_name);
1417
1418    /* Some directories cant be removed straight away, so do multiple passes */
1419    while (remove_file_array(remove_files, NULL))
1420        continue;
1421    free_array(remove_files);
1422
1423    /* Create a list of all /var/lib/dpkg/info/<package> files */
1424    remove_files = all_control_list(package_name);
1425
1426    /* Delete all of them except the postrm script */
1427    exclude_files = xzalloc(sizeof(exclude_files[0]) * 2);
1428    exclude_files[0] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1429    remove_file_array(remove_files, exclude_files);
1430    free_array(exclude_files);
1431
1432    /* Run and remove postrm script */
1433    run_package_script_or_die(package_name, "postrm");
1434    remove_file_array(remove_files, NULL);
1435
1436    free_array(remove_files);
1437
1438    /* Change package status */
1439    set_status(status_num, "not-installed", 3);
1440}
1441
1442static archive_handle_t *init_archive_deb_ar(const char *filename)
1443{
1444    archive_handle_t *ar_handle;
1445
1446    /* Setup an ar archive handle that refers to the gzip sub archive */
1447    ar_handle = init_handle();
1448    ar_handle->filter = filter_accept_list_reassign;
1449    ar_handle->src_fd = xopen(filename, O_RDONLY);
1450
1451    return ar_handle;
1452}
1453
1454static void init_archive_deb_control(archive_handle_t *ar_handle)
1455{
1456    archive_handle_t *tar_handle;
1457
1458    /* Setup the tar archive handle */
1459    tar_handle = init_handle();
1460    tar_handle->src_fd = ar_handle->src_fd;
1461
1462    /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1463#if ENABLE_FEATURE_SEAMLESS_GZ
1464    llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1465#endif
1466#if ENABLE_FEATURE_SEAMLESS_BZ2
1467    llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1468#endif
1469
1470    /* Assign the tar handle as a subarchive of the ar handle */
1471    ar_handle->dpkg__sub_archive = tar_handle;
1472}
1473
1474static void init_archive_deb_data(archive_handle_t *ar_handle)
1475{
1476    archive_handle_t *tar_handle;
1477
1478    /* Setup the tar archive handle */
1479    tar_handle = init_handle();
1480    tar_handle->src_fd = ar_handle->src_fd;
1481
1482    /* We don't care about control.tar.* or debian-binary, just data.tar.* */
1483#if ENABLE_FEATURE_SEAMLESS_GZ
1484    llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1485#endif
1486#if ENABLE_FEATURE_SEAMLESS_BZ2
1487    llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
1488#endif
1489
1490    /* Assign the tar handle as a subarchive of the ar handle */
1491    ar_handle->dpkg__sub_archive = tar_handle;
1492}
1493
1494static void FAST_FUNC data_extract_to_buffer(archive_handle_t *archive_handle)
1495{
1496    unsigned size = archive_handle->file_header->size;
1497
1498    archive_handle->dpkg__buffer = xzalloc(size + 1);
1499    xread(archive_handle->src_fd, archive_handle->dpkg__buffer, size);
1500}
1501
1502static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1503{
1504    ar_handle->dpkg__sub_archive->action_data = data_extract_to_buffer;
1505    ar_handle->dpkg__sub_archive->accept = myaccept;
1506    ar_handle->dpkg__sub_archive->filter = filter_accept_list;
1507
1508    unpack_ar_archive(ar_handle);
1509    close(ar_handle->src_fd);
1510
1511    return ar_handle->dpkg__sub_archive->dpkg__buffer;
1512}
1513
1514static void append_control_file_to_llist(const char *package_name, const char *control_name, llist_t **ll)
1515{
1516    FILE *fp;
1517    char *filename, *line;
1518
1519    filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, control_name);
1520    fp = fopen_for_read(filename);
1521    free(filename);
1522    if (fp != NULL) {
1523        while ((line = xmalloc_fgetline(fp)) != NULL)
1524            llist_add_to(ll, line);
1525        fclose(fp);
1526    }
1527}
1528
1529static char FAST_FUNC filter_rename_config(archive_handle_t *archive_handle)
1530{
1531    int fd;
1532    char *name_ptr = archive_handle->file_header->name + 1;
1533
1534    /* Is this file marked as config file? */
1535    if (!find_list_entry(archive_handle->accept, name_ptr))
1536        return EXIT_SUCCESS; /* no */
1537
1538    fd = open(name_ptr, O_RDONLY);
1539    if (fd >= 0) {
1540        md5_ctx_t md5;
1541        char *md5line, *buf;
1542        int count;
1543
1544        /* Calculate MD5 of existing file */
1545        buf = xmalloc(4096);
1546        md5_begin(&md5);
1547        while ((count = safe_read(fd, buf, 4096)) > 0)
1548            md5_hash(&md5, buf, count);
1549        md5_end(&md5, buf); /* using buf as result storage */
1550        close(fd);
1551
1552        md5line = xmalloc(16 * 2 + 2 + strlen(name_ptr) + 1);
1553        sprintf(bin2hex(md5line, buf, 16), "  %s", name_ptr);
1554        free(buf);
1555
1556        /* Is it changed after install? */
1557        if (find_list_entry(archive_handle->accept, md5line) == NULL) {
1558            printf("Warning: Creating %s as %s.dpkg-new\n", name_ptr, name_ptr);
1559            archive_handle->file_header->name = xasprintf("%s.dpkg-new", archive_handle->file_header->name);
1560        }
1561        free(md5line);
1562    }
1563    return EXIT_SUCCESS;
1564}
1565
1566static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
1567{
1568    char *name_ptr = archive_handle->file_header->name;
1569
1570    /* Skip all leading "/" */
1571    while (*name_ptr == '/')
1572        name_ptr++;
1573    /* Skip all leading "./" and "../" */
1574    while (name_ptr[0] == '.') {
1575        if (name_ptr[1] == '.')
1576            name_ptr++;
1577        if (name_ptr[1] != '/')
1578            break;
1579        name_ptr += 2;
1580    }
1581
1582    if (name_ptr[0] != '\0') {
1583        archive_handle->file_header->name = xasprintf("%s%s", archive_handle->dpkg__buffer, name_ptr);
1584        data_extract_all(archive_handle);
1585        if (fnmatch("*.dpkg-new", archive_handle->file_header->name, 0) == 0) {
1586            /* remove .dpkg-new suffix */
1587            archive_handle->file_header->name[strlen(archive_handle->file_header->name) - 9] = '\0';
1588        }
1589    }
1590}
1591
1592enum {
1593    /* Commands */
1594    OPT_configure            = (1 << 0),
1595    OPT_install              = (1 << 1),
1596    OPT_list_installed       = (1 << 2),
1597    OPT_purge                = (1 << 3),
1598    OPT_remove               = (1 << 4),
1599    OPT_unpack               = (1 << 5),
1600    OPTMASK_cmd              = (1 << 6) - 1,
1601    /* Options */
1602    OPT_force                = (1 << 6),
1603    OPT_force_ignore_depends = (1 << 7),
1604    OPT_force_confnew        = (1 << 8),
1605    OPT_force_confold        = (1 << 9),
1606};
1607
1608static void unpack_package(deb_file_t *deb_file)
1609{
1610    const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1611    const unsigned status_num = search_status_hashtable(package_name);
1612    const unsigned status_package_num = status_hashtable[status_num]->package;
1613    char *info_prefix;
1614    char *list_filename;
1615    archive_handle_t *archive_handle;
1616    FILE *out_stream;
1617    llist_t *accept_list;
1618    llist_t *conffile_list;
1619    int i;
1620
1621    /* If existing version, remove it first */
1622    conffile_list = NULL;
1623    if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1624        /* Package is already installed, remove old version first */
1625        printf("Preparing to replace %s %s (using %s)...\n", package_name,
1626            name_hashtable[package_hashtable[status_package_num]->version],
1627            deb_file->filename);
1628
1629        /* Read md5sums from old package */
1630        if (!(option_mask32 & OPT_force_confold))
1631            append_control_file_to_llist(package_name, "md5sums", &conffile_list);
1632
1633        remove_package(status_package_num, 0);
1634    } else {
1635        printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1636    }
1637
1638    /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1639    info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
1640    archive_handle = init_archive_deb_ar(deb_file->filename);
1641    init_archive_deb_control(archive_handle);
1642
1643    accept_list = NULL;
1644    i = 0;
1645    while (i < ARRAY_SIZE(all_control_files)) {
1646        char *c = xasprintf("./%s", all_control_files[i]);
1647        llist_add_to(&accept_list, c);
1648        i++;
1649    }
1650    archive_handle->dpkg__sub_archive->accept = accept_list;
1651    archive_handle->dpkg__sub_archive->filter = filter_accept_list;
1652    archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1653    archive_handle->dpkg__sub_archive->dpkg__buffer = info_prefix;
1654    archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1655    unpack_ar_archive(archive_handle);
1656
1657    /* Run the preinst prior to extracting */
1658    run_package_script_or_die(package_name, "preinst");
1659
1660    /* Don't overwrite existing config files */
1661    if (!(option_mask32 & OPT_force_confnew))
1662        append_control_file_to_llist(package_name, "conffiles", &conffile_list);
1663
1664    /* Extract data.tar.gz to the root directory */
1665    archive_handle = init_archive_deb_ar(deb_file->filename);
1666    init_archive_deb_data(archive_handle);
1667    archive_handle->dpkg__sub_archive->accept = conffile_list;
1668    /* Why ARCHIVE_REMEMBER_NAMES?
1669     * We want names collected in ->passed list even if conffile_list
1670     * is NULL (otherwise get_header_tar may optimize name saving out):
1671     */
1672    archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_REMEMBER_NAMES | ARCHIVE_UNLINK_OLD;
1673    archive_handle->dpkg__sub_archive->filter = filter_rename_config;
1674    archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1675    archive_handle->dpkg__sub_archive->dpkg__buffer = (char*)"/"; /* huh? */
1676    unpack_ar_archive(archive_handle);
1677
1678    /* Create the list file */
1679    list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
1680    out_stream = xfopen_for_write(list_filename);
1681    archive_handle->dpkg__sub_archive->passed = llist_rev(archive_handle->dpkg__sub_archive->passed);
1682    while (archive_handle->dpkg__sub_archive->passed) {
1683        char *filename = llist_pop(&archive_handle->dpkg__sub_archive->passed);
1684        /* the leading . has been stripped by data_extract_all_prefix already */
1685        fprintf(out_stream, "%s\n", filename);
1686        free(filename);
1687    }
1688    fclose(out_stream);
1689
1690    /* change status */
1691    set_status(status_num, "install", 1);
1692    set_status(status_num, "unpacked", 3);
1693
1694    free(info_prefix);
1695    free(list_filename);
1696}
1697
1698static void configure_package(deb_file_t *deb_file)
1699{
1700    const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1701    const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1702    const int status_num = search_status_hashtable(package_name);
1703
1704    printf("Setting up %s (%s)...\n", package_name, package_version);
1705
1706    /* Run the postinst script */
1707    /* TODO: handle failure gracefully */
1708    run_package_script_or_die(package_name, "postinst");
1709
1710    /* Change status to reflect success */
1711    set_status(status_num, "install", 1);
1712    set_status(status_num, "installed", 3);
1713}
1714
1715int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1716int dpkg_main(int argc UNUSED_PARAM, char **argv)
1717{
1718    deb_file_t **deb_file = NULL;
1719    status_node_t *status_node;
1720    char *str_f;
1721    int opt;
1722    int package_num;
1723    int deb_count = 0;
1724    int state_status;
1725    int status_num;
1726    int i;
1727#if ENABLE_LONG_OPTS
1728    static const char dpkg_longopts[] ALIGN1 =
1729// FIXME: we use -C non-compatibly, should be:
1730// "-C|--audit Check for broken package(s)"
1731        "configure\0"      No_argument        "C"
1732        "force\0"          Required_argument  "F"
1733        "install\0"        No_argument        "i"
1734        "list\0"           No_argument        "l"
1735        "purge\0"          No_argument        "P"
1736        "remove\0"         No_argument        "r"
1737        "unpack\0"         No_argument        "u"
1738        "force-depends\0"  No_argument        "\xff"
1739        "force-confnew\0"  No_argument        "\xfe"
1740        "force-confold\0"  No_argument        "\xfd"
1741        ;
1742#endif
1743
1744    INIT_G();
1745
1746    IF_LONG_OPTS(applet_long_options = dpkg_longopts);
1747    opt = getopt32(argv, "CilPruF:", &str_f);
1748    argv += optind;
1749    //if (opt & OPT_configure) ... // -C
1750    if (opt & OPT_force) { // -F (--force in official dpkg)
1751        if (strcmp(str_f, "depends") == 0)
1752            opt |= OPT_force_ignore_depends;
1753        else if (strcmp(str_f, "confnew") == 0)
1754            opt |= OPT_force_confnew;
1755        else if (strcmp(str_f, "confold") == 0)
1756            opt |= OPT_force_confold;
1757        else
1758            bb_show_usage();
1759        option_mask32 = opt;
1760    }
1761    //if (opt & OPT_install) ... // -i
1762    //if (opt & OPT_list_installed) ... // -l
1763    //if (opt & OPT_purge) ... // -P
1764    //if (opt & OPT_remove) ... // -r
1765    //if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1766    if (!(opt & OPTMASK_cmd) /* no cmd */
1767     || ((opt & OPTMASK_cmd) & ((opt & OPTMASK_cmd)-1)) /* more than one cmd */
1768    ) {
1769        bb_show_usage();
1770    }
1771
1772/*  puts("(Reading database ... xxxxx files and directories installed.)"); */
1773    index_status_file("/var/lib/dpkg/status");
1774
1775    /* if the list action was given print the installed packages and exit */
1776    if (opt & OPT_list_installed) {
1777        list_packages(argv[0]); /* param can be NULL */
1778        return EXIT_SUCCESS;
1779    }
1780
1781    /* Read arguments and store relevant info in structs */
1782    while (*argv) {
1783        /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1784        deb_file = xrealloc_vector(deb_file, 2, deb_count);
1785        deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1786        if (opt & (OPT_install | OPT_unpack)) {
1787            /* -i/-u: require filename */
1788            archive_handle_t *archive_handle;
1789            llist_t *control_list = NULL;
1790
1791            /* Extract the control file */
1792            llist_add_to(&control_list, (char*)"./control");
1793            archive_handle = init_archive_deb_ar(argv[0]);
1794            init_archive_deb_control(archive_handle);
1795            deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1796            if (deb_file[deb_count]->control_file == NULL) {
1797                bb_error_msg_and_die("can't extract control file");
1798            }
1799            deb_file[deb_count]->filename = xstrdup(argv[0]);
1800            package_num = fill_package_struct(deb_file[deb_count]->control_file);
1801
1802            if (package_num == -1) {
1803                bb_error_msg("invalid control file in %s", argv[0]);
1804                argv++;
1805                continue;
1806            }
1807            deb_file[deb_count]->package = (unsigned) package_num;
1808
1809            /* Add the package to the status hashtable */
1810            if (opt & (OPT_unpack | OPT_install)) {
1811                /* Try and find a currently installed version of this package */
1812                status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1813                /* If no previous entry was found initialise a new entry */
1814                if (status_hashtable[status_num] == NULL
1815                 || status_hashtable[status_num]->status == 0
1816                ) {
1817                    status_node = xmalloc(sizeof(status_node_t));
1818                    status_node->package = deb_file[deb_count]->package;
1819                    /* reinstreq isnt changed to "ok" until the package control info
1820                     * is written to the status file*/
1821                    status_node->status = search_name_hashtable("install reinstreq not-installed");
1822                    status_hashtable[status_num] = status_node;
1823                } else {
1824                    set_status(status_num, "install", 1);
1825                    set_status(status_num, "reinstreq", 2);
1826                }
1827            }
1828        } else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1829            /* -C/-p/-r: require package name */
1830            deb_file[deb_count]->package = search_package_hashtable(
1831                    search_name_hashtable(argv[0]),
1832                    search_name_hashtable("ANY"), VER_ANY);
1833            if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1834                bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1835            }
1836            package_num = deb_file[deb_count]->package;
1837            status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1838            state_status = get_status(status_num, 3);
1839
1840            /* check package status is "installed" */
1841            if (opt & OPT_remove) {
1842                if (strcmp(name_hashtable[state_status], "not-installed") == 0
1843                 || strcmp(name_hashtable[state_status], "config-files") == 0
1844                ) {
1845                    bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1846                }
1847                set_status(status_num, "deinstall", 1);
1848            } else if (opt & OPT_purge) {
1849                /* if package status is "conf-files" then its ok */
1850                if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1851                    bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1852                }
1853                set_status(status_num, "purge", 1);
1854            }
1855        }
1856        deb_count++;
1857        argv++;
1858    }
1859    if (!deb_count)
1860        bb_error_msg_and_die("no package files specified");
1861    deb_file[deb_count] = NULL;
1862
1863    /* Check that the deb file arguments are installable */
1864    if (!(opt & OPT_force_ignore_depends)) {
1865        if (!check_deps(deb_file, 0 /*, deb_count*/)) {
1866            bb_error_msg_and_die("dependency check failed");
1867        }
1868    }
1869
1870    /* TODO: install or remove packages in the correct dependency order */
1871    for (i = 0; i < deb_count; i++) {
1872        /* Remove or purge packages */
1873        if (opt & OPT_remove) {
1874            remove_package(deb_file[i]->package, 1);
1875        }
1876        else if (opt & OPT_purge) {
1877            purge_package(deb_file[i]->package);
1878        }
1879        else if (opt & OPT_unpack) {
1880            unpack_package(deb_file[i]);
1881        }
1882        else if (opt & OPT_install) {
1883            unpack_package(deb_file[i]);
1884            /* package is configured in second pass below */
1885        }
1886        else if (opt & OPT_configure) {
1887            configure_package(deb_file[i]);
1888        }
1889    }
1890    /* configure installed packages */
1891    if (opt & OPT_install) {
1892        for (i = 0; i < deb_count; i++)
1893            configure_package(deb_file[i]);
1894    }
1895
1896    write_status_file(deb_file);
1897
1898    if (ENABLE_FEATURE_CLEAN_UP) {
1899        for (i = 0; i < deb_count; i++) {
1900            free(deb_file[i]->control_file);
1901            free(deb_file[i]->filename);
1902            free(deb_file[i]);
1903        }
1904
1905        free(deb_file);
1906
1907        for (i = 0; i < NAME_HASH_PRIME; i++) {
1908            free(name_hashtable[i]);
1909        }
1910
1911        for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1912            free_package(package_hashtable[i]);
1913        }
1914
1915        for (i = 0; i < STATUS_HASH_PRIME; i++) {
1916            free(status_hashtable[i]);
1917        }
1918
1919        free(status_hashtable);
1920        free(package_hashtable);
1921        free(name_hashtable);
1922    }
1923
1924    return EXIT_SUCCESS;
1925}
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