source: branches/2.2.9/mindi-busybox/archival/dpkg.c @ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 9 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 57.7 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#include "libbb.h"
32#include <fnmatch.h>
33#include "archive.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            ) {
1071                /* start an EDGE_OR_ list */
1072                number_of_alternatives = package_edge->version;
1073                root_of_alternatives = package_edge;
1074                continue;
1075            }
1076            if (number_of_alternatives == 0) {  /* not in the middle of an EDGE_OR_ list */
1077                number_of_alternatives = 1;
1078                root_of_alternatives = NULL;
1079            }
1080
1081            package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1082
1083            if (package_edge->type == EDGE_PRE_DEPENDS
1084             || package_edge->type == EDGE_DEPENDS
1085            ) {
1086                int result=1;
1087                status_num = 0;
1088
1089                /* If we are inside an alternative then check
1090                 * this edge is the right type.
1091                 *
1092                 * EDGE_DEPENDS == OR_DEPENDS -1
1093                 * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1094                 */
1095                if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1096                    bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1097                                 package_edge->type, root_of_alternatives->type);
1098
1099                if (package_hashtable[package_num] != NULL)
1100                    result = !package_satisfies_dependency(package_num, package_edge->type);
1101
1102                if (result) { /* check for other package which provide what we are looking for */
1103                    int provider = -1;
1104
1105                    while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1106                        if (package_hashtable[provider] == NULL) {
1107                            puts("Have a provider but no package information for it");
1108                            continue;
1109                        }
1110                        result = !package_satisfies_dependency(provider, package_edge->type);
1111
1112                        if (result == 0)
1113                            break;
1114                    }
1115                }
1116
1117                /* It must be already installed, or to be installed */
1118                number_of_alternatives--;
1119                if (result && number_of_alternatives == 0) {
1120                    if (root_of_alternatives)
1121                        bb_error_msg_and_die(
1122                            "package %s %sdepends on %s, "
1123                            "which cannot be satisfied",
1124                            name_hashtable[package_node->name],
1125                            package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1126                            name_hashtable[root_of_alternatives->name]);
1127                    bb_error_msg_and_die(
1128                        "package %s %sdepends on %s, which %s\n",
1129                        name_hashtable[package_node->name],
1130                        package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1131                        name_hashtable[package_edge->name],
1132                        describe_status(status_num));
1133                }
1134                if (result == 0 && number_of_alternatives) {
1135                    /* we've found a package which
1136                     * satisfies the dependency,
1137                     * so skip over the rest of
1138                     * the alternatives.
1139                     */
1140                    j += number_of_alternatives;
1141                    number_of_alternatives = 0;
1142                }
1143            }
1144        }
1145    }
1146    free(conflicts);
1147    return TRUE;
1148}
1149
1150static char **create_list(const char *filename)
1151{
1152    FILE *list_stream;
1153    char **file_list;
1154    char *line;
1155    int count;
1156
1157    /* don't use [xw]fopen here, handle error ourself */
1158    list_stream = fopen_for_read(filename);
1159    if (list_stream == NULL) {
1160        return NULL;
1161    }
1162
1163    file_list = NULL;
1164    count = 0;
1165    while ((line = xmalloc_fgetline(list_stream)) != NULL) {
1166        file_list = xrealloc_vector(file_list, 2, count);
1167        file_list[count++] = line;
1168        /*file_list[count] = NULL; - xrealloc_vector did it */
1169    }
1170    fclose(list_stream);
1171
1172    return file_list;
1173}
1174
1175/* maybe i should try and hook this into remove_file.c somehow */
1176static int remove_file_array(char **remove_names, char **exclude_names)
1177{
1178    struct stat path_stat;
1179    int remove_flag = 1; /* not removed anything yet */
1180    int i, j;
1181
1182    if (remove_names == NULL) {
1183        return 0;
1184    }
1185    for (i = 0; remove_names[i] != NULL; i++) {
1186        if (exclude_names != NULL) {
1187            for (j = 0; exclude_names[j] != NULL; j++) {
1188                if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1189                    goto skip;
1190                }
1191            }
1192        }
1193        /* TODO: why we are checking lstat? we can just try rm/rmdir */
1194        if (lstat(remove_names[i], &path_stat) < 0) {
1195            continue;
1196        }
1197        if (S_ISDIR(path_stat.st_mode)) {
1198            remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
1199        } else {
1200            remove_flag &= unlink(remove_names[i]); /* 0 if no error */
1201        }
1202 skip:
1203        continue;
1204    }
1205    return (remove_flag == 0);
1206}
1207
1208static void run_package_script_or_die(const char *package_name, const char *script_type)
1209{
1210    char *script_path;
1211    int result;
1212
1213    script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1214
1215    /* If the file doesnt exist is isnt fatal */
1216    result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
1217    free(script_path);
1218    if (result)
1219        bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
1220}
1221
1222/*
1223The policy manual defines what scripts get called when and with
1224what arguments. I realize that busybox does not support all of
1225these scenarios, but it does support some of them; it does not,
1226however, run them with any parameters in run_package_script_or_die().
1227Here are the scripts:
1228
1229preinst install
1230preinst install <old_version>
1231preinst upgrade <old_version>
1232preinst abort_upgrade <new_version>
1233postinst configure <most_recent_version>
1234postinst abort-upgade <new_version>
1235postinst abort-remove
1236postinst abort-remove in-favour <package> <version>
1237postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
1238prerm remove
1239prerm upgrade <new_version>
1240prerm failed-upgrade <old_version>
1241prerm remove in-favor <package> <new_version>
1242prerm deconfigure in-favour <package> <version> removing <package> <version>
1243postrm remove
1244postrm purge
1245postrm upgrade <new_version>
1246postrm failed-upgrade <old_version>
1247postrm abort-install
1248postrm abort-install <old_version>
1249postrm abort-upgrade <old_version>
1250postrm disappear <overwriter> <version>
1251*/
1252static const char *const all_control_files[] = {
1253    "preinst", "postinst", "prerm", "postrm",
1254    "list", "md5sums", "shlibs", "conffiles",
1255    "config", "templates"
1256};
1257
1258static char **all_control_list(const char *package_name)
1259{
1260    unsigned i = 0;
1261    char **remove_files;
1262
1263    /* Create a list of all /var/lib/dpkg/info/<package> files */
1264    remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
1265    while (i < ARRAY_SIZE(all_control_files)) {
1266        remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
1267                package_name, all_control_files[i]);
1268        i++;
1269    }
1270
1271    return remove_files;
1272}
1273
1274static void free_array(char **array)
1275{
1276    if (array) {
1277        unsigned i = 0;
1278        while (array[i]) {
1279            free(array[i]);
1280            i++;
1281        }
1282        free(array);
1283    }
1284}
1285
1286/* This function lists information on the installed packages. It loops through
1287 * the status_hashtable to retrieve the info. This results in smaller code than
1288 * scanning the status file. The resulting list, however, is unsorted.
1289 */
1290static void list_packages(const char *pattern)
1291{
1292    int i;
1293
1294    puts("    Name           Version");
1295    puts("+++-==============-==============");
1296
1297    /* go through status hash, dereference package hash and finally strings */
1298    for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
1299        if (status_hashtable[i]) {
1300            const char *stat_str;  /* status string */
1301            const char *name_str;  /* package name */
1302            const char *vers_str;  /* version */
1303            char  s1, s2;          /* status abbreviations */
1304            int   spccnt;          /* space count */
1305            int   j;
1306
1307            stat_str = name_hashtable[status_hashtable[i]->status];
1308            name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1309            vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1310
1311            if (pattern && fnmatch(pattern, name_str, 0) != 0)
1312                continue;
1313
1314            /* get abbreviation for status field 1 */
1315            s1 = stat_str[0] == 'i' ? 'i' : 'r';
1316
1317            /* get abbreviation for status field 2 */
1318            for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
1319                if (stat_str[j] == ' ') spccnt++;
1320            }
1321            s2 = stat_str[j];
1322
1323            /* print out the line formatted like Debian dpkg */
1324            printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1325        }
1326    }
1327}
1328
1329static void remove_package(const unsigned package_num, int noisy)
1330{
1331    const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1332    const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1333    const unsigned status_num = search_status_hashtable(package_name);
1334    const int package_name_length = strlen(package_name);
1335    char **remove_files;
1336    char **exclude_files;
1337    char list_name[package_name_length + 25];
1338    char conffile_name[package_name_length + 30];
1339
1340    if (noisy)
1341        printf("Removing %s (%s)...\n", package_name, package_version);
1342
1343    /* Run prerm script */
1344    run_package_script_or_die(package_name, "prerm");
1345
1346    /* Create a list of files to remove, and a separate list of those to keep */
1347    sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1348    remove_files = create_list(list_name);
1349
1350    sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
1351    exclude_files = create_list(conffile_name);
1352
1353    /* Some directories can't be removed straight away, so do multiple passes */
1354    while (remove_file_array(remove_files, exclude_files))
1355        continue;
1356    free_array(exclude_files);
1357    free_array(remove_files);
1358
1359    /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep */
1360    exclude_files = xzalloc(sizeof(exclude_files[0]) * 3);
1361    exclude_files[0] = xstrdup(conffile_name);
1362    exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1363
1364    /* Create a list of all /var/lib/dpkg/info/<package> files */
1365    remove_files = all_control_list(package_name);
1366
1367    remove_file_array(remove_files, exclude_files);
1368    free_array(remove_files);
1369    free_array(exclude_files);
1370
1371    /* rename <package>.conffiles to <package>.list
1372     * The conffiles control file isn't required in Debian packages, so don't
1373     * error out if it's missing.  */
1374    rename(conffile_name, list_name);
1375
1376    /* Change package status */
1377    set_status(status_num, "config-files", 3);
1378}
1379
1380static void purge_package(const unsigned package_num)
1381{
1382    const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1383    const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1384    const unsigned status_num = search_status_hashtable(package_name);
1385    char **remove_files;
1386    char **exclude_files;
1387    char list_name[strlen(package_name) + 25];
1388
1389    printf("Purging %s (%s)...\n", package_name, package_version);
1390
1391    /* Run prerm script */
1392    run_package_script_or_die(package_name, "prerm");
1393
1394    /* Create a list of files to remove */
1395    sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1396    remove_files = create_list(list_name);
1397
1398    /* Some directories cant be removed straight away, so do multiple passes */
1399    while (remove_file_array(remove_files, NULL))
1400        continue;
1401    free_array(remove_files);
1402
1403    /* Create a list of all /var/lib/dpkg/info/<package> files */
1404    remove_files = all_control_list(package_name);
1405
1406    /* Delete all of them except the postrm script */
1407    exclude_files = xzalloc(sizeof(exclude_files[0]) * 2);
1408    exclude_files[0] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1409    remove_file_array(remove_files, exclude_files);
1410    free_array(exclude_files);
1411
1412    /* Run and remove postrm script */
1413    run_package_script_or_die(package_name, "postrm");
1414    remove_file_array(remove_files, NULL);
1415
1416    free_array(remove_files);
1417
1418    /* Change package status */
1419    set_status(status_num, "not-installed", 3);
1420}
1421
1422static archive_handle_t *init_archive_deb_ar(const char *filename)
1423{
1424    archive_handle_t *ar_handle;
1425
1426    /* Setup an ar archive handle that refers to the gzip sub archive */
1427    ar_handle = init_handle();
1428    ar_handle->filter = filter_accept_list_reassign;
1429    ar_handle->src_fd = xopen(filename, O_RDONLY);
1430
1431    return ar_handle;
1432}
1433
1434static void init_archive_deb_control(archive_handle_t *ar_handle)
1435{
1436    archive_handle_t *tar_handle;
1437
1438    /* Setup the tar archive handle */
1439    tar_handle = init_handle();
1440    tar_handle->src_fd = ar_handle->src_fd;
1441
1442    /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1443#if ENABLE_FEATURE_SEAMLESS_GZ
1444    llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1445#endif
1446#if ENABLE_FEATURE_SEAMLESS_BZ2
1447    llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1448#endif
1449
1450    /* Assign the tar handle as a subarchive of the ar handle */
1451    ar_handle->dpkg__sub_archive = tar_handle;
1452}
1453
1454static void init_archive_deb_data(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 control.tar.* or debian-binary, just data.tar.* */
1463#if ENABLE_FEATURE_SEAMLESS_GZ
1464    llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1465#endif
1466#if ENABLE_FEATURE_SEAMLESS_BZ2
1467    llist_add_to(&(ar_handle->accept), (char*)"data.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 FAST_FUNC data_extract_to_buffer(archive_handle_t *archive_handle)
1475{
1476    unsigned size = archive_handle->file_header->size;
1477
1478    archive_handle->dpkg__buffer = xzalloc(size + 1);
1479    xread(archive_handle->src_fd, archive_handle->dpkg__buffer, size);
1480}
1481
1482static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1483{
1484    ar_handle->dpkg__sub_archive->action_data = data_extract_to_buffer;
1485    ar_handle->dpkg__sub_archive->accept = myaccept;
1486    ar_handle->dpkg__sub_archive->filter = filter_accept_list;
1487
1488    unpack_ar_archive(ar_handle);
1489    close(ar_handle->src_fd);
1490
1491    return ar_handle->dpkg__sub_archive->dpkg__buffer;
1492}
1493
1494static void append_control_file_to_llist(const char *package_name, const char *control_name, llist_t **ll)
1495{
1496    FILE *fp;
1497    char *filename, *line;
1498
1499    filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, control_name);
1500    fp = fopen_for_read(filename);
1501    free(filename);
1502    if (fp != NULL) {
1503        while ((line = xmalloc_fgetline(fp)) != NULL)
1504            llist_add_to(ll, line);
1505        fclose(fp);
1506    }
1507}
1508
1509static char FAST_FUNC filter_rename_config(archive_handle_t *archive_handle)
1510{
1511    int fd;
1512    char *name_ptr = archive_handle->file_header->name + 1;
1513
1514    /* Is this file marked as config file? */
1515    if (!find_list_entry(archive_handle->accept, name_ptr))
1516        return EXIT_SUCCESS; /* no */
1517
1518    fd = open(name_ptr, O_RDONLY);
1519    if (fd >= 0) {
1520        md5_ctx_t md5;
1521        char *md5line, *buf;
1522        int count;
1523
1524        /* Calculate MD5 of existing file */
1525        buf = xmalloc(4096);
1526        md5_begin(&md5);
1527        while ((count = safe_read(fd, buf, 4096)) > 0)
1528            md5_hash(&md5, buf, count);
1529        md5_end(&md5, buf); /* using buf as result storage */
1530        close(fd);
1531
1532        md5line = xmalloc(16 * 2 + 2 + strlen(name_ptr) + 1);
1533        sprintf(bin2hex(md5line, buf, 16), "  %s", name_ptr);
1534        free(buf);
1535
1536        /* Is it changed after install? */
1537        if (find_list_entry(archive_handle->accept, md5line) == NULL) {
1538            printf("Warning: Creating %s as %s.dpkg-new\n", name_ptr, name_ptr);
1539            archive_handle->file_header->name = xasprintf("%s.dpkg-new", archive_handle->file_header->name);
1540        }
1541        free(md5line);
1542    }
1543    return EXIT_SUCCESS;
1544}
1545
1546static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
1547{
1548    char *name_ptr = archive_handle->file_header->name;
1549
1550    /* Skip all leading "/" */
1551    while (*name_ptr == '/')
1552        name_ptr++;
1553    /* Skip all leading "./" and "../" */
1554    while (name_ptr[0] == '.') {
1555        if (name_ptr[1] == '.')
1556            name_ptr++;
1557        if (name_ptr[1] != '/')
1558            break;
1559        name_ptr += 2;
1560    }
1561
1562    if (name_ptr[0] != '\0') {
1563        archive_handle->file_header->name = xasprintf("%s%s", archive_handle->dpkg__buffer, name_ptr);
1564        data_extract_all(archive_handle);
1565        if (fnmatch("*.dpkg-new", archive_handle->file_header->name, 0) == 0) {
1566            /* remove .dpkg-new suffix */
1567            archive_handle->file_header->name[strlen(archive_handle->file_header->name) - 9] = '\0';
1568        }
1569    }
1570}
1571
1572enum {
1573    /* Commands */
1574    OPT_configure            = (1 << 0),
1575    OPT_install              = (1 << 1),
1576    OPT_list_installed       = (1 << 2),
1577    OPT_purge                = (1 << 3),
1578    OPT_remove               = (1 << 4),
1579    OPT_unpack               = (1 << 5),
1580    OPTMASK_cmd              = (1 << 6) - 1,
1581    /* Options */
1582    OPT_force                = (1 << 6),
1583    OPT_force_ignore_depends = (1 << 7),
1584    OPT_force_confnew        = (1 << 8),
1585    OPT_force_confold        = (1 << 9),
1586};
1587
1588static void unpack_package(deb_file_t *deb_file)
1589{
1590    const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1591    const unsigned status_num = search_status_hashtable(package_name);
1592    const unsigned status_package_num = status_hashtable[status_num]->package;
1593    char *info_prefix;
1594    char *list_filename;
1595    archive_handle_t *archive_handle;
1596    FILE *out_stream;
1597    llist_t *accept_list;
1598    llist_t *conffile_list;
1599    int i;
1600
1601    /* If existing version, remove it first */
1602    conffile_list = NULL;
1603    if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1604        /* Package is already installed, remove old version first */
1605        printf("Preparing to replace %s %s (using %s)...\n", package_name,
1606            name_hashtable[package_hashtable[status_package_num]->version],
1607            deb_file->filename);
1608
1609        /* Read md5sums from old package */
1610        if (!(option_mask32 & OPT_force_confold))
1611            append_control_file_to_llist(package_name, "md5sums", &conffile_list);
1612
1613        remove_package(status_package_num, 0);
1614    } else {
1615        printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1616    }
1617
1618    /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1619    info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
1620    archive_handle = init_archive_deb_ar(deb_file->filename);
1621    init_archive_deb_control(archive_handle);
1622
1623    accept_list = NULL;
1624    i = 0;
1625    while (i < ARRAY_SIZE(all_control_files)) {
1626        char *c = xasprintf("./%s", all_control_files[i]);
1627        llist_add_to(&accept_list, c);
1628        i++;
1629    }
1630    archive_handle->dpkg__sub_archive->accept = accept_list;
1631    archive_handle->dpkg__sub_archive->filter = filter_accept_list;
1632    archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1633    archive_handle->dpkg__sub_archive->dpkg__buffer = info_prefix;
1634    archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1635    unpack_ar_archive(archive_handle);
1636
1637    /* Run the preinst prior to extracting */
1638    run_package_script_or_die(package_name, "preinst");
1639
1640    /* Don't overwrite existing config files */
1641    if (!(option_mask32 & OPT_force_confnew))
1642        append_control_file_to_llist(package_name, "conffiles", &conffile_list);
1643
1644    /* Extract data.tar.gz to the root directory */
1645    archive_handle = init_archive_deb_ar(deb_file->filename);
1646    init_archive_deb_data(archive_handle);
1647    archive_handle->dpkg__sub_archive->accept = conffile_list;
1648    archive_handle->dpkg__sub_archive->filter = filter_rename_config;
1649    archive_handle->dpkg__sub_archive->action_data = data_extract_all_prefix;
1650    archive_handle->dpkg__sub_archive->dpkg__buffer = (char*)"/"; /* huh? */
1651    archive_handle->dpkg__sub_archive->ah_flags |= ARCHIVE_UNLINK_OLD;
1652    unpack_ar_archive(archive_handle);
1653
1654    /* Create the list file */
1655    list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
1656    out_stream = xfopen_for_write(list_filename);
1657    while (archive_handle->dpkg__sub_archive->passed) {
1658        /* the leading . has been stripped by data_extract_all_prefix already */
1659        fputs(archive_handle->dpkg__sub_archive->passed->data, out_stream);
1660        fputc('\n', out_stream);
1661        archive_handle->dpkg__sub_archive->passed = archive_handle->dpkg__sub_archive->passed->link;
1662    }
1663    fclose(out_stream);
1664
1665    /* change status */
1666    set_status(status_num, "install", 1);
1667    set_status(status_num, "unpacked", 3);
1668
1669    free(info_prefix);
1670    free(list_filename);
1671}
1672
1673static void configure_package(deb_file_t *deb_file)
1674{
1675    const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1676    const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1677    const int status_num = search_status_hashtable(package_name);
1678
1679    printf("Setting up %s (%s)...\n", package_name, package_version);
1680
1681    /* Run the postinst script */
1682    /* TODO: handle failure gracefully */
1683    run_package_script_or_die(package_name, "postinst");
1684
1685    /* Change status to reflect success */
1686    set_status(status_num, "install", 1);
1687    set_status(status_num, "installed", 3);
1688}
1689
1690int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1691int dpkg_main(int argc UNUSED_PARAM, char **argv)
1692{
1693    deb_file_t **deb_file = NULL;
1694    status_node_t *status_node;
1695    char *str_f;
1696    int opt;
1697    int package_num;
1698    int deb_count = 0;
1699    int state_status;
1700    int status_num;
1701    int i;
1702#if ENABLE_LONG_OPTS
1703    static const char dpkg_longopts[] ALIGN1 =
1704// FIXME: we use -C non-compatibly, should be:
1705// "-C|--audit Check for broken package(s)"
1706        "configure\0"      No_argument        "C"
1707        "force\0"          Required_argument  "F"
1708        "install\0"        No_argument        "i"
1709        "list\0"           No_argument        "l"
1710        "purge\0"          No_argument        "P"
1711        "remove\0"         No_argument        "r"
1712        "unpack\0"         No_argument        "u"
1713        "force-depends\0"  No_argument        "\xff"
1714        "force-confnew\0"  No_argument        "\xfe"
1715        "force-confold\0"  No_argument        "\xfd"
1716        ;
1717#endif
1718
1719    INIT_G();
1720
1721    IF_LONG_OPTS(applet_long_options = dpkg_longopts);
1722    opt = getopt32(argv, "CilPruF:", &str_f);
1723    argv += optind;
1724    //if (opt & OPT_configure) ... // -C
1725    if (opt & OPT_force) { // -F (--force in official dpkg)
1726        if (strcmp(str_f, "depends") == 0)
1727            opt |= OPT_force_ignore_depends;
1728        else if (strcmp(str_f, "confnew") == 0)
1729            opt |= OPT_force_confnew;
1730        else if (strcmp(str_f, "confold") == 0)
1731            opt |= OPT_force_confold;
1732        else
1733            bb_show_usage();
1734        option_mask32 = opt;
1735    }
1736    //if (opt & OPT_install) ... // -i
1737    //if (opt & OPT_list_installed) ... // -l
1738    //if (opt & OPT_purge) ... // -P
1739    //if (opt & OPT_remove) ... // -r
1740    //if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1741    if (!(opt & OPTMASK_cmd) /* no cmd */
1742     || ((opt & OPTMASK_cmd) & ((opt & OPTMASK_cmd)-1)) /* more than one cmd */
1743    ) {
1744        bb_show_usage();
1745    }
1746
1747/*  puts("(Reading database ... xxxxx files and directories installed.)"); */
1748    index_status_file("/var/lib/dpkg/status");
1749
1750    /* if the list action was given print the installed packages and exit */
1751    if (opt & OPT_list_installed) {
1752        list_packages(argv[0]); /* param can be NULL */
1753        return EXIT_SUCCESS;
1754    }
1755
1756    /* Read arguments and store relevant info in structs */
1757    while (*argv) {
1758        /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1759        deb_file = xrealloc_vector(deb_file, 2, deb_count);
1760        deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1761        if (opt & (OPT_install | OPT_unpack)) {
1762            /* -i/-u: require filename */
1763            archive_handle_t *archive_handle;
1764            llist_t *control_list = NULL;
1765
1766            /* Extract the control file */
1767            llist_add_to(&control_list, (char*)"./control");
1768            archive_handle = init_archive_deb_ar(argv[0]);
1769            init_archive_deb_control(archive_handle);
1770            deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1771            if (deb_file[deb_count]->control_file == NULL) {
1772                bb_error_msg_and_die("can't extract control file");
1773            }
1774            deb_file[deb_count]->filename = xstrdup(argv[0]);
1775            package_num = fill_package_struct(deb_file[deb_count]->control_file);
1776
1777            if (package_num == -1) {
1778                bb_error_msg("invalid control file in %s", argv[0]);
1779                argv++;
1780                continue;
1781            }
1782            deb_file[deb_count]->package = (unsigned) package_num;
1783
1784            /* Add the package to the status hashtable */
1785            if (opt & (OPT_unpack | OPT_install)) {
1786                /* Try and find a currently installed version of this package */
1787                status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1788                /* If no previous entry was found initialise a new entry */
1789                if (status_hashtable[status_num] == NULL
1790                 || status_hashtable[status_num]->status == 0
1791                ) {
1792                    status_node = xmalloc(sizeof(status_node_t));
1793                    status_node->package = deb_file[deb_count]->package;
1794                    /* reinstreq isnt changed to "ok" until the package control info
1795                     * is written to the status file*/
1796                    status_node->status = search_name_hashtable("install reinstreq not-installed");
1797                    status_hashtable[status_num] = status_node;
1798                } else {
1799                    set_status(status_num, "install", 1);
1800                    set_status(status_num, "reinstreq", 2);
1801                }
1802            }
1803        } else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1804            /* -C/-p/-r: require package name */
1805            deb_file[deb_count]->package = search_package_hashtable(
1806                    search_name_hashtable(argv[0]),
1807                    search_name_hashtable("ANY"), VER_ANY);
1808            if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1809                bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1810            }
1811            package_num = deb_file[deb_count]->package;
1812            status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1813            state_status = get_status(status_num, 3);
1814
1815            /* check package status is "installed" */
1816            if (opt & OPT_remove) {
1817                if (strcmp(name_hashtable[state_status], "not-installed") == 0
1818                 || strcmp(name_hashtable[state_status], "config-files") == 0
1819                ) {
1820                    bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1821                }
1822                set_status(status_num, "deinstall", 1);
1823            } else if (opt & OPT_purge) {
1824                /* if package status is "conf-files" then its ok */
1825                if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1826                    bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1827                }
1828                set_status(status_num, "purge", 1);
1829            }
1830        }
1831        deb_count++;
1832        argv++;
1833    }
1834    if (!deb_count)
1835        bb_error_msg_and_die("no package files specified");
1836    deb_file[deb_count] = NULL;
1837
1838    /* Check that the deb file arguments are installable */
1839    if (!(opt & OPT_force_ignore_depends)) {
1840        if (!check_deps(deb_file, 0 /*, deb_count*/)) {
1841            bb_error_msg_and_die("dependency check failed");
1842        }
1843    }
1844
1845    /* TODO: install or remove packages in the correct dependency order */
1846    for (i = 0; i < deb_count; i++) {
1847        /* Remove or purge packages */
1848        if (opt & OPT_remove) {
1849            remove_package(deb_file[i]->package, 1);
1850        }
1851        else if (opt & OPT_purge) {
1852            purge_package(deb_file[i]->package);
1853        }
1854        else if (opt & OPT_unpack) {
1855            unpack_package(deb_file[i]);
1856        }
1857        else if (opt & OPT_install) {
1858            unpack_package(deb_file[i]);
1859            /* package is configured in second pass below */
1860        }
1861        else if (opt & OPT_configure) {
1862            configure_package(deb_file[i]);
1863        }
1864    }
1865    /* configure installed packages */
1866    if (opt & OPT_install) {
1867        for (i = 0; i < deb_count; i++)
1868            configure_package(deb_file[i]);
1869    }
1870
1871    write_status_file(deb_file);
1872
1873    if (ENABLE_FEATURE_CLEAN_UP) {
1874        for (i = 0; i < deb_count; i++) {
1875            free(deb_file[i]->control_file);
1876            free(deb_file[i]->filename);
1877            free(deb_file[i]);
1878        }
1879
1880        free(deb_file);
1881
1882        for (i = 0; i < NAME_HASH_PRIME; i++) {
1883            free(name_hashtable[i]);
1884        }
1885
1886        for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1887            free_package(package_hashtable[i]);
1888        }
1889
1890        for (i = 0; i < STATUS_HASH_PRIME; i++) {
1891            free(status_hashtable[i]);
1892        }
1893
1894        free(status_hashtable);
1895        free(package_hashtable);
1896        free(name_hashtable);
1897    }
1898
1899    return EXIT_SUCCESS;
1900}
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