archival/dpkg.c

   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  *  started life as a busybox implementation of udpkg
  10  *
  11  * licensed under gplv2 or later, see file license in this tarball for details.
  12  */
  13
  14 /*
  15  * known difference between busybox dpkg and the official dpkg that i don't
  16  * consider important, its worth keeping a note of differences anyway, just to
  17  * make it easier to maintain.
  18  *  - the first value for the confflile: field isnt placed on a new line.
  19  *  - when installing a package the status: field is placed at the end of the
  20  *      section, rather than just after the package: field.
  21  *
  22  * bugs that need to be fixed
  23  *  - (unknown, please let me know when you find any)
  24  *
  25  */
  26
  27 #include "busybox.h"
  28 #include "unarchive.h"
  29
  30 /* note: if you vary hash_prime sizes be aware,
  31  * 1) tweaking these will have a big effect on how much memory this program uses.
  32  * 2) for computational efficiency these hash tables should be at least 20%
  33  *    larger than the maximum number of elements stored in it.
  34  * 3) all _hash_prime's must be a prime number or chaos is assured, if your looking
  35  *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
  36  * 4) if you go bigger than 15 bits you may get into trouble (untested) as its
  37  *    sometimes cast to an unsigned int, if you go to 16 bit you will overlap
  38  *    int's and chaos is assured, 16381 is the max prime for 14 bit field
  39  */
  40
  41 /* NAME_HASH_PRIME, Stores package names and versions,
  42  * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
  43  * as there a lot of duplicate version numbers */
  44 #define NAME_HASH_PRIME 16381
  45
  46 /* PACKAGE_HASH_PRIME, Maximum number of unique packages,
  47  * It must not be smaller than STATUS_HASH_PRIME,
  48  * Currently only packages from status_hashtable are stored in here, but in
  49  * future this may be used to store packages not only from a status file,
  50  * but an available_hashtable, and even multiple packages files.
  51  * Package can be stored more than once if they have different versions.
  52  * e.g. The same package may have different versions in the status file
  53  *      and available file */
  54 #define PACKAGE_HASH_PRIME 10007
  55 typedef struct edge_s {
  56         unsigned int operator:3;
  57         unsigned int type:4;
  58         unsigned int name:14;
  59         unsigned int version:14;
  60 } edge_t;
  61
  62 typedef struct common_node_s {
  63         unsigned int name:14;
  64         unsigned int version:14;
  65         unsigned int num_of_edges:14;
  66         edge_t **edge;
  67 } common_node_t;
  68
  69 /* Currently it doesnt store packages that have state-status of not-installed
  70  * So it only really has to be the size of the maximum number of packages
  71  * likely to be installed at any one time, so there is a bit of leeway here */
  72 #define STATUS_HASH_PRIME 8191
  73 typedef struct status_node_s {
  74         unsigned int package:14;        /* has to fit PACKAGE_HASH_PRIME */
  75         unsigned int status:14;         /* has to fit STATUS_HASH_PRIME */
  76 } status_node_t;
  77
  78 /* Were statically declared here, but such a big bss is nommu-unfriendly */
  79 static char **name_hashtable;             /* [NAME_HASH_PRIME + 1] */
  80 static common_node_t **package_hashtable; /* [PACKAGE_HASH_PRIME + 1] */
  81 static status_node_t **status_hashtable;  /* [STATUS_HASH_PRIME + 1] */
  82
  83 /* Even numbers are for 'extras', like ored dependencies or null */
  84 enum edge_type_e {
  85         EDGE_NULL = 0,
  86         EDGE_PRE_DEPENDS = 1,
  87         EDGE_OR_PRE_DEPENDS = 2,
  88         EDGE_DEPENDS = 3,
  89         EDGE_OR_DEPENDS = 4,
  90         EDGE_REPLACES = 5,
  91         EDGE_PROVIDES = 7,
  92         EDGE_CONFLICTS = 9,
  93         EDGE_SUGGESTS = 11,
  94         EDGE_RECOMMENDS = 13,
  95         EDGE_ENHANCES = 15
  96 };
  97 enum operator_e {
  98         VER_NULL = 0,
  99         VER_EQUAL = 1,
 100         VER_LESS = 2,
 101         VER_LESS_EQUAL = 3,
 102         VER_MORE = 4,
 103         VER_MORE_EQUAL = 5,
 104         VER_ANY = 6
 105 };
 106
 107 enum dpkg_opt_e {
 108         dpkg_opt_purge = 1,
 109         dpkg_opt_remove = 2,
 110         dpkg_opt_unpack = 4,
 111         dpkg_opt_configure = 8,
 112         dpkg_opt_install = 16,
 113         dpkg_opt_package_name = 32,
 114         dpkg_opt_filename = 64,
 115         dpkg_opt_list_installed = 128,
 116         dpkg_opt_force_ignore_depends = 256
 117 };
 118
 119 typedef struct deb_file_s {
 120         char *control_file;
 121         char *filename;
 122         unsigned int package:14;
 123 } deb_file_t;
 124
 125
 126 static void make_hash(const char *key, unsigned int *start, unsigned int *decrement, const int hash_prime)
 127 {
 128         unsigned long int hash_num = key[0];
 129         int len = strlen(key);
 130         int i;
 131
 132         /* Maybe i should have uses a "proper" hashing algorithm here instead
 133          * of making one up myself, seems to be working ok though. */
 134         for (i = 1; i < len; i++) {
 135                 /* shifts the ascii based value and adds it to previous value
 136                  * shift amount is mod 24 because long int is 32 bit and data
 137                  * to be shifted is 8, don't want to shift data to where it has
 138                  * no effect*/
 139                 hash_num += ((key[i] + key[i-1]) << ((key[i] * i) % 24));
 140         }
 141         *start = (unsigned int) hash_num % hash_prime;
 142         *decrement = (unsigned int) 1 + (hash_num % (hash_prime - 1));
 143 }
 144
 145 /* this adds the key to the hash table */
 146 static int search_name_hashtable(const char *key)
 147 {
 148         unsigned int probe_address = 0;
 149         unsigned int probe_decrement = 0;
 150 //      char *temp;
 151
 152         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 153         while (name_hashtable[probe_address] != NULL) {
 154                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 155                         return probe_address;
 156                 } else {
 157                         probe_address -= probe_decrement;
 158                         if ((int)probe_address < 0) {
 159                                 probe_address += NAME_HASH_PRIME;
 160                         }
 161                 }
 162         }
 163         name_hashtable[probe_address] = xstrdup(key);
 164         return probe_address;
 165 }
 166
 167 /* this DOESNT add the key to the hashtable
 168  * TODO make it consistent with search_name_hashtable
 169  */
 170 static unsigned int search_status_hashtable(const char *key)
 171 {
 172         unsigned int probe_address = 0;
 173         unsigned int probe_decrement = 0;
 174
 175         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 176         while (status_hashtable[probe_address] != NULL) {
 177                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 178                         break;
 179                 } else {
 180                         probe_address -= probe_decrement;
 181                         if ((int)probe_address < 0) {
 182                                 probe_address += STATUS_HASH_PRIME;
 183                         }
 184                 }
 185         }
 186         return probe_address;
 187 }
 188
 189 /* Need to rethink version comparison, maybe the official dpkg has something i can use ? */
 190 static int version_compare_part(const char *version1, const char *version2)
 191 {
 192         int upstream_len1 = 0;
 193         int upstream_len2 = 0;
 194         char *name1_char;
 195         char *name2_char;
 196         int len1 = 0;
 197         int len2 = 0;
 198         int tmp_int;
 199         int ver_num1;
 200         int ver_num2;
 201         int ret;
 202
 203         if (version1 == NULL) {
 204                 version1 = xstrdup("");
 205         }
 206         if (version2 == NULL) {
 207                 version2 = xstrdup("");
 208         }
 209         upstream_len1 = strlen(version1);
 210         upstream_len2 = strlen(version2);
 211
 212         while ((len1 < upstream_len1) || (len2 < upstream_len2)) {
 213                 /* Compare non-digit section */
 214                 tmp_int = strcspn(&version1[len1], "0123456789");
 215                 name1_char = xstrndup(&version1[len1], tmp_int);
 216                 len1 += tmp_int;
 217                 tmp_int = strcspn(&version2[len2], "0123456789");
 218                 name2_char = xstrndup(&version2[len2], tmp_int);
 219                 len2 += tmp_int;
 220                 tmp_int = strcmp(name1_char, name2_char);
 221                 free(name1_char);
 222                 free(name2_char);
 223                 if (tmp_int != 0) {
 224                         ret = tmp_int;
 225                         goto cleanup_version_compare_part;
 226                 }
 227
 228                 /* Compare digits */
 229                 tmp_int = strspn(&version1[len1], "0123456789");
 230                 name1_char = xstrndup(&version1[len1], tmp_int);
 231                 len1 += tmp_int;
 232                 tmp_int = strspn(&version2[len2], "0123456789");
 233                 name2_char = xstrndup(&version2[len2], tmp_int);
 234                 len2 += tmp_int;
 235                 ver_num1 = atoi(name1_char);
 236                 ver_num2 = atoi(name2_char);
 237                 free(name1_char);
 238                 free(name2_char);
 239                 if (ver_num1 < ver_num2) {
 240                         ret = -1;
 241                         goto cleanup_version_compare_part;
 242                 }
 243                 else if (ver_num1 > ver_num2) {
 244                         ret = 1;
 245                         goto cleanup_version_compare_part;
 246                 }
 247         }
 248         ret = 0;
 249 cleanup_version_compare_part:
 250         return ret;
 251 }
 252
 253 /* if ver1 < ver2 return -1,
 254  * if ver1 = ver2 return 0,
 255  * if ver1 > ver2 return 1,
 256  */
 257 static int version_compare(const unsigned int ver1, const unsigned int ver2)
 258 {
 259         char *ch_ver1 = name_hashtable[ver1];
 260         char *ch_ver2 = name_hashtable[ver2];
 261
 262         char epoch1, epoch2;
 263         char *deb_ver1, *deb_ver2;
 264         char *ver1_ptr, *ver2_ptr;
 265         char *upstream_ver1;
 266         char *upstream_ver2;
 267         int result;
 268
 269         /* Compare epoch */
 270         if (ch_ver1[1] == ':') {
 271                 epoch1 = ch_ver1[0];
 272                 ver1_ptr = strchr(ch_ver1, ':') + 1;
 273         } else {
 274                 epoch1 = '0';
 275                 ver1_ptr = ch_ver1;
 276         }
 277         if (ch_ver2[1] == ':') {
 278                 epoch2 = ch_ver2[0];
 279                 ver2_ptr = strchr(ch_ver2, ':') + 1;
 280         } else {
 281                 epoch2 = '0';
 282                 ver2_ptr = ch_ver2;
 283         }
 284         if (epoch1 < epoch2) {
 285                 return -1;
 286         }
 287         else if (epoch1 > epoch2) {
 288                 return 1;
 289         }
 290
 291         /* Compare upstream version */
 292         upstream_ver1 = xstrdup(ver1_ptr);
 293         upstream_ver2 = xstrdup(ver2_ptr);
 294
 295         /* Chop off debian version, and store for later use */
 296         deb_ver1 = strrchr(upstream_ver1, '-');
 297         deb_ver2 = strrchr(upstream_ver2, '-');
 298         if (deb_ver1) {
 299                 deb_ver1[0] = '\0';
 300                 deb_ver1++;
 301         }
 302         if (deb_ver2) {
 303                 deb_ver2[0] = '\0';
 304                 deb_ver2++;
 305         }
 306         result = version_compare_part(upstream_ver1, upstream_ver2);
 307         if (!result)
 308                 /* Compare debian versions */
 309                 result = version_compare_part(deb_ver1, deb_ver2);
 310
 311         free(upstream_ver1);
 312         free(upstream_ver2);
 313         return result;
 314 }
 315
 316 static int test_version(const unsigned int version1, const unsigned int version2, const unsigned int operator)
 317 {
 318         const int version_result = version_compare(version1, version2);
 319         switch (operator) {
 320                 case VER_ANY:
 321                         return TRUE;
 322                 case VER_EQUAL:
 323                         if (version_result == 0) {
 324                                 return TRUE;
 325                         }
 326                         break;
 327                 case VER_LESS:
 328                         if (version_result < 0) {
 329                                 return TRUE;
 330                         }
 331                         break;
 332                 case VER_LESS_EQUAL:
 333                         if (version_result <= 0) {
 334                                 return TRUE;
 335                         }
 336                         break;
 337                 case VER_MORE:
 338                         if (version_result > 0) {
 339                                 return TRUE;
 340                         }
 341                         break;
 342                 case VER_MORE_EQUAL:
 343                         if (version_result >= 0) {
 344                                 return TRUE;
 345                         }
 346                         break;
 347         }
 348         return FALSE;
 349 }
 350
 351
 352 static int search_package_hashtable(const unsigned int name, const unsigned int version, const unsigned int operator)
 353 {
 354         unsigned int probe_address = 0;
 355         unsigned int probe_decrement = 0;
 356
 357         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 358         while (package_hashtable[probe_address] != NULL) {
 359                 if (package_hashtable[probe_address]->name == name) {
 360                         if (operator == VER_ANY) {
 361                                 return probe_address;
 362                         }
 363                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 364                                 return probe_address;
 365                         }
 366                 }
 367                 probe_address -= probe_decrement;
 368                 if ((int)probe_address < 0) {
 369                         probe_address += PACKAGE_HASH_PRIME;
 370                 }
 371         }
 372         return probe_address;
 373 }
 374
 375 /*
 376  * This function searches through the entire package_hashtable looking
 377  * for a package which provides "needle". It returns the index into
 378  * the package_hashtable for the providing package.
 379  *
 380  * needle is the index into name_hashtable of the package we are
 381  * looking for.
 382  *
 383  * start_at is the index in the package_hashtable to start looking
 384  * at. If start_at is -1 then start at the beginning. This is to allow
 385  * for repeated searches since more than one package might provide
 386  * needle.
 387  *
 388  * FIXME: I don't think this is very efficient, but I thought I'd keep
 389  * it simple for now until it proves to be a problem.
 390  */
 391 static int search_for_provides(int needle, int start_at) {
 392         int i, j;
 393         common_node_t *p;
 394         for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
 395                 p = package_hashtable[i];
 396                 if (p == NULL) continue;
 397                 for (j = 0; j < p->num_of_edges; j++)
 398                         if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
 399                                 return i;
 400         }
 401         return -1;
 402 }
 403
 404 /*
 405  * Add an edge to a node
 406  */
 407 static void add_edge_to_node(common_node_t *node, edge_t *edge)
 408 {
 409         node->num_of_edges++;
 410         node->edge = xrealloc(node->edge, sizeof(edge_t) * (node->num_of_edges + 1));
 411         node->edge[node->num_of_edges - 1] = edge;
 412 }
 413
 414 /*
 415  * Create one new node and one new edge for every dependency.
 416  *
 417  * Dependencies which contain multiple alternatives are represented as
 418  * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
 419  * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
 420  * the OR edge contains the full dependency string while the version
 421  * field contains the number of EDGE nodes which follow as part of
 422  * this alternative.
 423  */
 424 static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned int edge_type)
 425 {
 426         char *line = xstrdup(whole_line);
 427         char *line2;
 428         char *line_ptr1 = NULL;
 429         char *line_ptr2 = NULL;
 430         char *field;
 431         char *field2;
 432         char *version;
 433         edge_t *edge;
 434         edge_t *or_edge;
 435         int offset_ch;
 436
 437         field = strtok_r(line, ",", &line_ptr1);
 438         do {
 439                 /* skip leading spaces */
 440                 field += strspn(field, " ");
 441                 line2 = xstrdup(field);
 442                 field2 = strtok_r(line2, "|", &line_ptr2);
 443                 if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS) &&
 444                     (strcmp(field, field2) != 0)) {
 445                         or_edge = (edge_t *)xmalloc(sizeof(edge_t));
 446                         or_edge->type = edge_type + 1;
 447                 } else {
 448                         or_edge = NULL;
 449                 }
 450
 451                 if (or_edge) {
 452                         or_edge->name = search_name_hashtable(field);
 453                         or_edge->version = 0; // tracks the number of altenatives
 454
 455                         add_edge_to_node(parent_node, or_edge);
 456                 }
 457
 458                 do {
 459                         edge = (edge_t *) xmalloc(sizeof(edge_t));
 460                         edge->type = edge_type;
 461
 462                         /* Skip any extra leading spaces */
 463                         field2 += strspn(field2, " ");
 464
 465                         /* Get dependency version info */
 466                         version = strchr(field2, '(');
 467                         if (version == NULL) {
 468                                 edge->operator = VER_ANY;
 469                                 /* Get the versions hash number, adding it if the number isnt already in there */
 470                                 edge->version = search_name_hashtable("ANY");
 471                         } else {
 472                                 /* Skip leading ' ' or '(' */
 473                                 version += strspn(field2, " ");
 474                                 version += strspn(version, "(");
 475                                 /* Calculate length of any operator characters */
 476                                 offset_ch = strspn(version, "<=>");
 477                                 /* Determine operator */
 478                                 if (offset_ch > 0) {
 479                                         if (strncmp(version, "=", offset_ch) == 0) {
 480                                                 edge->operator = VER_EQUAL;
 481                                         }
 482                                         else if (strncmp(version, "<<", offset_ch) == 0) {
 483                                                 edge->operator = VER_LESS;
 484                                         }
 485                                         else if (strncmp(version, "<=", offset_ch) == 0) {
 486                                                 edge->operator = VER_LESS_EQUAL;
 487                                         }
 488                                         else if (strncmp(version, ">>", offset_ch) == 0) {
 489                                                 edge->operator = VER_MORE;
 490                                         }
 491                                         else if (strncmp(version, ">=", offset_ch) == 0) {
 492                                                 edge->operator = VER_MORE_EQUAL;
 493                                         } else {
 494                                                 bb_error_msg_and_die("illegal operator");
 495                                         }
 496                                 }
 497                                 /* skip to start of version numbers */
 498                                 version += offset_ch;
 499                                 version += strspn(version, " ");
 500
 501                                 /* Truncate version at trailing ' ' or ')' */
 502                                 version[strcspn(version, " )")] = '\0';
 503                                 /* Get the versions hash number, adding it if the number isnt already in there */
 504                                 edge->version = search_name_hashtable(version);
 505                         }
 506
 507                         /* Get the dependency name */
 508                         field2[strcspn(field2, " (")] = '\0';
 509                         edge->name = search_name_hashtable(field2);
 510
 511                         if (or_edge)
 512                                 or_edge->version++;
 513
 514                         add_edge_to_node(parent_node, edge);
 515                 } while ((field2 = strtok_r(NULL, "|", &line_ptr2)) != NULL);
 516                 free(line2);
 517         } while ((field = strtok_r(NULL, ",", &line_ptr1)) != NULL);
 518         free(line);
 519
 520         return;
 521 }
 522
 523 static void free_package(common_node_t *node)
 524 {
 525         unsigned i;
 526         if (node) {
 527                 for (i = 0; i < node->num_of_edges; i++) {
 528                         free(node->edge[i]);
 529                 }
 530                 free(node->edge);
 531                 free(node);
 532         }
 533 }
 534
 535 /*
 536  * Gets the next package field from package_buffer, seperated into the field name
 537  * and field value, it returns the int offset to the first character of the next field
 538  */
 539 static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
 540 {
 541         int offset_name_start = 0;
 542         int offset_name_end = 0;
 543         int offset_value_start = 0;
 544         int offset_value_end = 0;
 545         int offset = 0;
 546         int next_offset;
 547         int name_length;
 548         int value_length;
 549         int exit_flag = FALSE;
 550
 551         if (package_buffer == NULL) {
 552                 *field_name = NULL;
 553                 *field_value = NULL;
 554                 return -1;
 555         }
 556         while (1) {
 557                 next_offset = offset + 1;
 558                 switch (package_buffer[offset]) {
 559                         case '\0':
 560                                 exit_flag = TRUE;
 561                                 break;
 562                         case ':':
 563                                 if (offset_name_end == 0) {
 564                                         offset_name_end = offset;
 565                                         offset_value_start = next_offset;
 566                                 }
 567                                 /* TODO: Name might still have trailing spaces if ':' isnt
 568                                  * immediately after name */
 569                                 break;
 570                         case '\n':
 571                                 /* TODO: The char next_offset may be out of bounds */
 572                                 if (package_buffer[next_offset] != ' ') {
 573                                         exit_flag = TRUE;
 574                                         break;
 575                                 }
 576                         case '\t':
 577                         case ' ':
 578                                 /* increment the value start point if its a just filler */
 579                                 if (offset_name_start == offset) {
 580                                         offset_name_start++;
 581                                 }
 582                                 if (offset_value_start == offset) {
 583                                         offset_value_start++;
 584                                 }
 585                                 break;
 586                 }
 587                 if (exit_flag) {
 588                         /* Check that the names are valid */
 589                         offset_value_end = offset;
 590                         name_length = offset_name_end - offset_name_start;
 591                         value_length = offset_value_end - offset_value_start;
 592                         if (name_length == 0) {
 593                                 break;
 594                         }
 595                         if ((name_length > 0) && (value_length > 0)) {
 596                                 break;
 597                         }
 598
 599                         /* If not valid, start fresh with next field */
 600                         exit_flag = FALSE;
 601                         offset_name_start = offset + 1;
 602                         offset_name_end = 0;
 603                         offset_value_start = offset + 1;
 604                         offset_value_end = offset + 1;
 605                         offset++;
 606                 }
 607                 offset++;
 608         }
 609         if (name_length == 0) {
 610                 *field_name = NULL;
 611         } else {
 612                 *field_name = xstrndup(&package_buffer[offset_name_start], name_length);
 613         }
 614         if (value_length > 0) {
 615                 *field_value = xstrndup(&package_buffer[offset_value_start], value_length);
 616         } else {
 617                 *field_value = NULL;
 618         }
 619         return next_offset;
 620 }
 621
 622 static unsigned int fill_package_struct(char *control_buffer)
 623 {
 624         static const char *const field_names[] = { "Package", "Version",
 625                 "Pre-Depends", "Depends","Replaces", "Provides",
 626                 "Conflicts", "Suggests", "Recommends", "Enhances", 0
 627         };
 628
 629         common_node_t *new_node = (common_node_t *) xzalloc(sizeof(common_node_t));
 630         char *field_name;
 631         char *field_value;
 632         int field_start = 0;
 633         int num = -1;
 634         int buffer_length = strlen(control_buffer);
 635
 636         new_node->version = search_name_hashtable("unknown");
 637         while (field_start < buffer_length) {
 638                 unsigned field_num;
 639
 640                 field_start += read_package_field(&control_buffer[field_start],
 641                                 &field_name, &field_value);
 642
 643                 if (field_name == NULL) {
 644                         goto fill_package_struct_cleanup; /* Oh no, the dreaded goto statement ! */
 645                 }
 646
 647                 field_num = compare_string_array(field_names, field_name);
 648                 switch (field_num) {
 649                         case 0: /* Package */
 650                                 new_node->name = search_name_hashtable(field_value);
 651                                 break;
 652                         case 1: /* Version */
 653                                 new_node->version = search_name_hashtable(field_value);
 654                                 break;
 655                         case 2: /* Pre-Depends */
 656                                 add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 657                                 break;
 658                         case 3: /* Depends */
 659                                 add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 660                                 break;
 661                         case 4: /* Replaces */
 662                                 add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 663                                 break;
 664                         case 5: /* Provides */
 665                                 add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 666                                 break;
 667                         case 6: /* Conflicts */
 668                                 add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 669                                 break;
 670                         case 7: /* Suggests */
 671                                 add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 672                                 break;
 673                         case 8: /* Recommends */
 674                                 add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 675                                 break;
 676                         case 9: /* Enhances */
 677                                 add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 678                                 break;
 679                 }
 680 fill_package_struct_cleanup:
 681                 free(field_name);
 682                 free(field_value);
 683         }
 684
 685         if (new_node->version == search_name_hashtable("unknown")) {
 686                 free_package(new_node);
 687                 return -1;
 688         }
 689         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 690         if (package_hashtable[num] == NULL) {
 691                 package_hashtable[num] = new_node;
 692         } else {
 693                 free_package(new_node);
 694         }
 695         return num;
 696 }
 697
 698 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
 699 static unsigned int get_status(const unsigned int status_node, const int num)
 700 {
 701         char *status_string = name_hashtable[status_hashtable[status_node]->status];
 702         char *state_sub_string;
 703         unsigned int state_sub_num;
 704         int len;
 705         int i;
 706
 707         /* set tmp_string to point to the start of the word number */
 708         for (i = 1; i < num; i++) {
 709                 /* skip past a word */
 710                 status_string += strcspn(status_string, " ");
 711                 /* skip past the separating spaces */
 712                 status_string += strspn(status_string, " ");
 713         }
 714         len = strcspn(status_string, " \n\0");
 715         state_sub_string = xstrndup(status_string, len);
 716         state_sub_num = search_name_hashtable(state_sub_string);
 717         free(state_sub_string);
 718         return state_sub_num;
 719 }
 720
 721 static void set_status(const unsigned int status_node_num, const char *new_value, const int position)
 722 {
 723         const unsigned int new_value_len = strlen(new_value);
 724         const unsigned int new_value_num = search_name_hashtable(new_value);
 725         unsigned int want = get_status(status_node_num, 1);
 726         unsigned int flag = get_status(status_node_num, 2);
 727         unsigned int status = get_status(status_node_num, 3);
 728         int want_len = strlen(name_hashtable[want]);
 729         int flag_len = strlen(name_hashtable[flag]);
 730         int status_len = strlen(name_hashtable[status]);
 731         char *new_status;
 732
 733         switch (position) {
 734                 case 1:
 735                         want = new_value_num;
 736                         want_len = new_value_len;
 737                         break;
 738                 case 2:
 739                         flag = new_value_num;
 740                         flag_len = new_value_len;
 741                         break;
 742                 case 3:
 743                         status = new_value_num;
 744                         status_len = new_value_len;
 745                         break;
 746                 default:
 747                         bb_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
 748         }
 749
 750         new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
 751         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
 752         free(new_status);
 753         return;
 754 }
 755
 756 static const char *describe_status(int status_num) {
 757         int status_want, status_state ;
 758         if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
 759                 return "is not installed or flagged to be installed\n";
 760
 761         status_want = get_status(status_num, 1);
 762         status_state = get_status(status_num, 3);
 763
 764         if (status_state == search_name_hashtable("installed")) {
 765                 if (status_want == search_name_hashtable("install"))
 766                         return "is installed";
 767                 if (status_want == search_name_hashtable("deinstall"))
 768                         return "is marked to be removed";
 769                 if (status_want == search_name_hashtable("purge"))
 770                         return "is marked to be purged";
 771         }
 772         if (status_want ==  search_name_hashtable("unknown"))
 773                 return "is in an indeterminate state";
 774         if (status_want == search_name_hashtable("install"))
 775                 return "is marked to be installed";
 776
 777         return "is not installed or flagged to be installed";
 778 }
 779
 780
 781 static void index_status_file(const char *filename)
 782 {
 783         FILE *status_file;
 784         char *control_buffer;
 785         char *status_line;
 786         status_node_t *status_node = NULL;
 787         unsigned int status_num;
 788
 789         status_file = xfopen(filename, "r");
 790         while ((control_buffer = fgets_str(status_file, "\n\n")) != NULL) {
 791                 const unsigned int package_num = fill_package_struct(control_buffer);
 792                 if (package_num != -1) {
 793                         status_node = xmalloc(sizeof(status_node_t));
 794                         /* fill_package_struct doesnt handle the status field */
 795                         status_line = strstr(control_buffer, "Status:");
 796                         if (status_line != NULL) {
 797                                 status_line += 7;
 798                                 status_line += strspn(status_line, " \n\t");
 799                                 status_line = xstrndup(status_line, strcspn(status_line, "\n\0"));
 800                                 status_node->status = search_name_hashtable(status_line);
 801                                 free(status_line);
 802                         }
 803                         status_node->package = package_num;
 804                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
 805                         status_hashtable[status_num] = status_node;
 806                 }
 807                 free(control_buffer);
 808         }
 809         fclose(status_file);
 810         return;
 811 }
 812
 813 static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
 814 {
 815         char *name;
 816         char *value;
 817         int start = 0;
 818         while (1) {
 819                 start += read_package_field(&control_buffer[start], &name, &value);
 820                 if (name == NULL) {
 821                         break;
 822                 }
 823                 if (strcmp(name, "Status") != 0) {
 824                         fprintf(new_status_file, "%s: %s\n", name, value);
 825                 }
 826         }
 827         return;
 828 }
 829
 830 /* This could do with a cleanup */
 831 static void write_status_file(deb_file_t **deb_file)
 832 {
 833         FILE *old_status_file = xfopen("/var/lib/dpkg/status", "r");
 834         FILE *new_status_file = xfopen("/var/lib/dpkg/status.udeb", "w");
 835         char *package_name;
 836         char *status_from_file;
 837         char *control_buffer = NULL;
 838         char *tmp_string;
 839         int status_num;
 840         int field_start = 0;
 841         int write_flag;
 842         int i = 0;
 843
 844         /* Update previously known packages */
 845         while ((control_buffer = fgets_str(old_status_file, "\n\n")) != NULL) {
 846                 if ((tmp_string = strstr(control_buffer, "Package:")) == NULL) {
 847                         continue;
 848                 }
 849
 850                 tmp_string += 8;
 851                 tmp_string += strspn(tmp_string, " \n\t");
 852                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n\0"));
 853                 write_flag = FALSE;
 854                 tmp_string = strstr(control_buffer, "Status:");
 855                 if (tmp_string != NULL) {
 856                         /* Seperate the status value from the control buffer */
 857                         tmp_string += 7;
 858                         tmp_string += strspn(tmp_string, " \n\t");
 859                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 860                 } else {
 861                         status_from_file = NULL;
 862                 }
 863
 864                 /* Find this package in the status hashtable */
 865                 status_num = search_status_hashtable(package_name);
 866                 if (status_hashtable[status_num] != NULL) {
 867                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 868                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 869                                 /* New status isnt exactly the same as old status */
 870                                 const int state_status = get_status(status_num, 3);
 871                                 if ((strcmp("installed", name_hashtable[state_status]) == 0) ||
 872                                         (strcmp("unpacked", name_hashtable[state_status]) == 0)) {
 873                                         /* We need to add the control file from the package */
 874                                         i = 0;
 875                                         while (deb_file[i] != NULL) {
 876                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 877                                                         /* Write a status file entry with a modified status */
 878                                                         /* remove trailing \n's */
 879                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 880                                                         set_status(status_num, "ok", 2);
 881                                                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 882                                                         write_flag = TRUE;
 883                                                         break;
 884                                                 }
 885                                                 i++;
 886                                         }
 887                                         /* This is temperary, debugging only */
 888                                         if (deb_file[i] == NULL) {
 889                                                 bb_error_msg_and_die("ALERT: Couldnt find a control file, your status file may be broken, status may be incorrect for %s", package_name);
 890                                         }
 891                                 }
 892                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 893                                         /* Only write the Package, Status, Priority and Section lines */
 894                                         fprintf(new_status_file, "Package: %s\n", package_name);
 895                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 896
 897                                         while (1) {
 898                                                 char *field_name;
 899                                                 char *field_value;
 900                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 901                                                 if (field_name == NULL) {
 902                                                         break;
 903                                                 }
 904                                                 if ((strcmp(field_name, "Priority") == 0) ||
 905                                                         (strcmp(field_name, "Section") == 0)) {
 906                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 907                                                 }
 908                                         }
 909                                         write_flag = TRUE;
 910                                         fputs("\n", new_status_file);
 911                                 }
 912                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 913                                         /* only change the status line */
 914                                         while (1) {
 915                                                 char *field_name;
 916                                                 char *field_value;
 917                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 918                                                 if (field_name == NULL) {
 919                                                         break;
 920                                                 }
 921                                                 /* Setup start point for next field */
 922                                                 if (strcmp(field_name, "Status") == 0) {
 923                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 924                                                 } else {
 925                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 926                                                 }
 927                                         }
 928                                         write_flag = TRUE;
 929                                         fputs("\n", new_status_file);
 930                                 }
 931                         }
 932                 }
 933                 /* If the package from the status file wasnt handle above, do it now*/
 934                 if (! write_flag) {
 935                         fprintf(new_status_file, "%s\n\n", control_buffer);
 936                 }
 937
 938                 free(status_from_file);
 939                 free(package_name);
 940                 free(control_buffer);
 941         }
 942
 943         /* Write any new packages */
 944         for (i = 0; deb_file[i] != NULL; i++) {
 945                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 946                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 947                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 948                         set_status(status_num, "ok", 2);
 949                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 950                 }
 951         }
 952         fclose(old_status_file);
 953         fclose(new_status_file);
 954
 955
 956         /* Create a separate backfile to dpkg */
 957         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 958                 struct stat stat_buf;
 959                 xstat("/var/lib/dpkg/status", &stat_buf);
 960                 /* Its ok if renaming the status file fails because status
 961                  * file doesnt exist, maybe we are starting from scratch */
 962                 bb_error_msg("no status file found, creating new one");
 963         }
 964
 965         if (rename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status") == -1) {
 966                 bb_error_msg_and_die("DANGER: Cannot create status file, you need to manually repair your status file");
 967         }
 968 }
 969
 970 /* This function returns TRUE if the given package can satisfy a
 971  * dependency of type depend_type.
 972  *
 973  * A pre-depends is satisfied only if a package is already installed,
 974  * which a regular depends can be satisfied by a package which we want
 975  * to install.
 976  */
 977 static int package_satisfies_dependency(int package, int depend_type)
 978 {
 979         int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
 980
 981         /* status could be unknown if package is a pure virtual
 982          * provides which cannot satisfy any dependency by itself.
 983          */
 984         if (status_hashtable[status_num] == NULL)
 985                 return 0;
 986
 987         switch (depend_type) {
 988         case EDGE_PRE_DEPENDS:  return get_status(status_num, 3) == search_name_hashtable("installed");
 989         case EDGE_DEPENDS:      return get_status(status_num, 1) == search_name_hashtable("install");
 990         }
 991         return 0;
 992 }
 993
 994 static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
 995 {
 996         int *conflicts = NULL;
 997         int conflicts_num = 0;
 998         int i = deb_start;
 999         int j;
1000
1001         /* Check for conflicts
1002          * TODO: TEST if conflicts with other packages to be installed
1003          *
1004          * Add install packages and the packages they provide
1005          * to the list of files to check conflicts for
1006          */
1007
1008         /* Create array of package numbers to check against
1009          * installed package for conflicts*/
1010         while (deb_file[i] != NULL) {
1011                 const unsigned int package_num = deb_file[i]->package;
1012                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
1013                 conflicts[conflicts_num] = package_num;
1014                 conflicts_num++;
1015                 /* add provides to conflicts list */
1016                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
1017                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
1018                                 const int conflicts_package_num = search_package_hashtable(
1019                                         package_hashtable[package_num]->edge[j]->name,
1020                                         package_hashtable[package_num]->edge[j]->version,
1021                                         package_hashtable[package_num]->edge[j]->operator);
1022                                 if (package_hashtable[conflicts_package_num] == NULL) {
1023                                         /* create a new package */
1024                                         common_node_t *new_node = (common_node_t *) xzalloc(sizeof(common_node_t));
1025                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
1026                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
1027                                         package_hashtable[conflicts_package_num] = new_node;
1028                                 }
1029                                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
1030                                 conflicts[conflicts_num] = conflicts_package_num;
1031                                 conflicts_num++;
1032                         }
1033                 }
1034                 i++;
1035         }
1036
1037         /* Check conflicts */
1038         i = 0;
1039         while (deb_file[i] != NULL) {
1040                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
1041                 int status_num = 0;
1042                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1043
1044                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
1045                         i++;
1046                         continue;
1047                 }
1048
1049                 for (j = 0; j < package_node->num_of_edges; j++) {
1050                         const edge_t *package_edge = package_node->edge[j];
1051
1052                         if (package_edge->type == EDGE_CONFLICTS) {
1053                                 const unsigned int package_num =
1054                                         search_package_hashtable(package_edge->name,
1055                                                                  package_edge->version,
1056                                                                  package_edge->operator);
1057                                 int result = 0;
1058                                 if (package_hashtable[package_num] != NULL) {
1059                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1060
1061                                         if (get_status(status_num, 1) == search_name_hashtable("install")) {
1062                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
1063                                                         package_edge->version, package_edge->operator);
1064                                         }
1065                                 }
1066
1067                                 if (result) {
1068                                         bb_error_msg_and_die("package %s conflicts with %s",
1069                                                 name_hashtable[package_node->name],
1070                                                 name_hashtable[package_edge->name]);
1071                                 }
1072                         }
1073                 }
1074                 i++;
1075         }
1076
1077
1078         /* Check dependendcies */
1079         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1080                 int status_num = 0;
1081                 int number_of_alternatives = 0;
1082                 const edge_t * root_of_alternatives = NULL;
1083                 const common_node_t *package_node = package_hashtable[i];
1084
1085                 /* If the package node does not exist then this
1086                  * package is a virtual one. In which case there are
1087                  * no dependencies to check.
1088                  */
1089                 if (package_node == NULL) continue;
1090
1091                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1092
1093                 /* If there is no status then this package is a
1094                  * virtual one provided by something else. In which
1095                  * case there are no dependencies to check.
1096                  */
1097                 if (status_hashtable[status_num] == NULL) continue;
1098
1099                 /* If we don't want this package installed then we may
1100                  * as well ignore it's dependencies.
1101                  */
1102                 if (get_status(status_num, 1) != search_name_hashtable("install")) {
1103                         continue;
1104                 }
1105
1106                 /* This code is tested only for EDGE_DEPENDS, since I
1107                  * have no suitable pre-depends available. There is no
1108                  * reason that it shouldn't work though :-)
1109                  */
1110                 for (j = 0; j < package_node->num_of_edges; j++) {
1111                         const edge_t *package_edge = package_node->edge[j];
1112                         unsigned int package_num;
1113
1114                         if (package_edge->type == EDGE_OR_PRE_DEPENDS ||
1115                             package_edge->type == EDGE_OR_DEPENDS) {    /* start an EDGE_OR_ list */
1116                                 number_of_alternatives = package_edge->version;
1117                                 root_of_alternatives = package_edge;
1118                                 continue;
1119                         } else if (number_of_alternatives == 0) {       /* not in the middle of an EDGE_OR_ list */
1120                                 number_of_alternatives = 1;
1121                                 root_of_alternatives = NULL;
1122                         }
1123
1124                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1125
1126                         if (package_edge->type == EDGE_PRE_DEPENDS ||
1127                             package_edge->type == EDGE_DEPENDS) {
1128                                 int result=1;
1129                                 status_num = 0;
1130
1131                                 /* If we are inside an alternative then check
1132                                  * this edge is the right type.
1133                                  *
1134                                  * EDGE_DEPENDS == OR_DEPENDS -1
1135                                  * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1136                                  */
1137                                 if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1138                                         bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1139                                                              package_edge->type, root_of_alternatives->type);
1140
1141                                 if (package_hashtable[package_num] != NULL)
1142                                         result = !package_satisfies_dependency(package_num, package_edge->type);
1143
1144                                 if (result) { /* check for other package which provide what we are looking for */
1145                                         int provider = -1;
1146
1147                                         while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1148                                                 if (package_hashtable[provider] == NULL) {
1149                                                         puts("Have a provider but no package information for it");
1150                                                         continue;
1151                                                 }
1152                                                 result = !package_satisfies_dependency(provider, package_edge->type);
1153
1154                                                 if (result == 0)
1155                                                         break;
1156                                         }
1157                                 }
1158
1159                                 /* It must be already installed, or to be installed */
1160                                 number_of_alternatives--;
1161                                 if (result && number_of_alternatives == 0) {
1162                                         if (root_of_alternatives)
1163                                                 bb_error_msg_and_die(
1164                                                         "package %s %sdepends on %s, "
1165                                                         "which cannot be satisfied",
1166                                                         name_hashtable[package_node->name],
1167                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1168                                                         name_hashtable[root_of_alternatives->name]);
1169                                         else
1170                                                 bb_error_msg_and_die(
1171                                                         "package %s %sdepends on %s, which %s\n",
1172                                                         name_hashtable[package_node->name],
1173                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1174                                                         name_hashtable[package_edge->name],
1175                                                         describe_status(status_num));
1176                                 } else if (result == 0 && number_of_alternatives) {
1177                                         /* we've found a package which
1178                                          * satisfies the dependency,
1179                                          * so skip over the rest of
1180                                          * the alternatives.
1181                                          */
1182                                         j += number_of_alternatives;
1183                                         number_of_alternatives = 0;
1184                                 }
1185                         }
1186                 }
1187         }
1188         free(conflicts);
1189         return TRUE;
1190 }
1191
1192 static char **create_list(const char *filename)
1193 {
1194         FILE *list_stream;
1195         char **file_list = NULL;
1196         char *line = NULL;
1197         int count = 0;
1198
1199         /* don't use [xw]fopen here, handle error ourself */
1200         list_stream = fopen(filename, "r");
1201         if (list_stream == NULL) {
1202                 return NULL;
1203         }
1204
1205         while ((line = bb_get_chomped_line_from_file(list_stream)) != NULL) {
1206                 file_list = xrealloc(file_list, sizeof(char *) * (count + 2));
1207                 file_list[count] = line;
1208                 count++;
1209         }
1210         fclose(list_stream);
1211
1212         if (count == 0) {
1213                 return NULL;
1214         } else {
1215                 file_list[count] = NULL;
1216                 return file_list;
1217         }
1218 }
1219
1220 /* maybe i should try and hook this into remove_file.c somehow */
1221 static int remove_file_array(char **remove_names, char **exclude_names)
1222 {
1223         struct stat path_stat;
1224         int match_flag;
1225         int remove_flag = FALSE;
1226         int i,j;
1227
1228         if (remove_names == NULL) {
1229                 return FALSE;
1230         }
1231         for (i = 0; remove_names[i] != NULL; i++) {
1232                 match_flag = FALSE;
1233                 if (exclude_names != NULL) {
1234                         for (j = 0; exclude_names[j] != 0; j++) {
1235                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1236                                         match_flag = TRUE;
1237                                         break;
1238                                 }
1239                         }
1240                 }
1241                 if (!match_flag) {
1242                         if (lstat(remove_names[i], &path_stat) < 0) {
1243                                 continue;
1244                         }
1245                         if (S_ISDIR(path_stat.st_mode)) {
1246                                 if (rmdir(remove_names[i]) != -1) {
1247                                         remove_flag = TRUE;
1248                                 }
1249                         } else {
1250                                 if (unlink(remove_names[i]) != -1) {
1251                                         remove_flag = TRUE;
1252                                 }
1253                         }
1254                 }
1255         }
1256         return remove_flag;
1257 }
1258
1259 static int run_package_script(const char *package_name, const char *script_type)
1260 {
1261         struct stat path_stat;
1262         char *script_path;
1263         int result;
1264
1265         script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1266
1267         /* If the file doesnt exist is isnt a fatal */
1268         result = lstat(script_path, &path_stat) < 0 ? EXIT_SUCCESS : system(script_path);
1269         free(script_path);
1270         return result;
1271 }
1272
1273 static const char *all_control_files[] = {"preinst", "postinst", "prerm", "postrm",
1274         "list", "md5sums", "shlibs", "conffiles", "config", "templates", NULL };
1275
1276 static char **all_control_list(const char *package_name)
1277 {
1278         unsigned i = 0;
1279         char **remove_files;
1280
1281         /* Create a list of all /var/lib/dpkg/info/<package> files */
1282         remove_files = xzalloc(sizeof(all_control_files));
1283         while (all_control_files[i]) {
1284                 remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, all_control_files[i]);
1285                 i++;
1286         }
1287
1288         return remove_files;
1289 }
1290
1291 static void free_array(char **array)
1292 {
1293
1294         if (array) {
1295                 unsigned i = 0;
1296                 while (array[i]) {
1297                         free(array[i]);
1298                         i++;
1299                 }
1300                 free(array);
1301         }
1302 }
1303
1304 /* This function lists information on the installed packages. It loops through
1305  * the status_hashtable to retrieve the info. This results in smaller code than
1306  * scanning the status file. The resulting list, however, is unsorted.
1307  */
1308 static void list_packages(void)
1309 {
1310         int i;
1311
1312         puts("    Name           Version");
1313         puts("+++-==============-==============");
1314
1315         /* go through status hash, dereference package hash and finally strings */
1316         for (i=0; i<STATUS_HASH_PRIME+1; i++) {
1317
1318                 if (status_hashtable[i]) {
1319                         const char *stat_str;  /* status string */
1320                         const char *name_str;  /* package name */
1321                         const char *vers_str;  /* version */
1322                         char  s1, s2;          /* status abbreviations */
1323                         int   spccnt;          /* space count */
1324                         int   j;
1325
1326                         stat_str = name_hashtable[status_hashtable[i]->status];
1327                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1328                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1329
1330                         /* get abbreviation for status field 1 */
1331                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1332
1333                         /* get abbreviation for status field 2 */
1334                         for (j=0, spccnt=0; stat_str[j] && spccnt<2; j++) {
1335                                 if (stat_str[j] == ' ') spccnt++;
1336                         }
1337                         s2 = stat_str[j];
1338
1339                         /* print out the line formatted like Debian dpkg */
1340                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1341                 }
1342     }
1343 }
1344
1345 static void remove_package(const unsigned int package_num, int noisy)
1346 {
1347         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1348         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1349         const unsigned int status_num = search_status_hashtable(package_name);
1350         const int package_name_length = strlen(package_name);
1351         char **remove_files;
1352         char **exclude_files;
1353         char list_name[package_name_length + 25];
1354         char conffile_name[package_name_length + 30];
1355         int return_value;
1356
1357         if (noisy)
1358                 printf("Removing %s (%s)...\n", package_name, package_version);
1359
1360         /* run prerm script */
1361         return_value = run_package_script(package_name, "prerm");
1362         if (return_value == -1) {
1363                 bb_error_msg_and_die("script failed, prerm failure");
1364         }
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.list", package_name);
1368         remove_files = create_list(list_name);
1369
1370         sprintf(conffile_name, "/var/lib/dpkg/info/%s.conffiles", package_name);
1371         exclude_files = create_list(conffile_name);
1372
1373         /* Some directories cant be removed straight away, so do multiple passes */
1374         while (remove_file_array(remove_files, exclude_files));
1375         free_array(exclude_files);
1376         free_array(remove_files);
1377
1378         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep  */
1379         exclude_files = xzalloc(sizeof(char*) * 3);
1380         exclude_files[0] = xstrdup(conffile_name);
1381         exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.postrm", package_name);
1382
1383         /* Create a list of all /var/lib/dpkg/info/<package> files */
1384         remove_files = all_control_list(package_name);
1385
1386         remove_file_array(remove_files, exclude_files);
1387         free_array(remove_files);
1388         free_array(exclude_files);
1389
1390         /* rename <package>.conffile to <package>.list */
1391         rename(conffile_name, list_name);
1392
1393         /* Change package status */
1394         set_status(status_num, "config-files", 3);
1395 }
1396
1397 static void purge_package(const unsigned int package_num)
1398 {
1399         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1400         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1401         const unsigned int status_num = search_status_hashtable(package_name);
1402         char **remove_files;
1403         char **exclude_files;
1404         char list_name[strlen(package_name) + 25];
1405
1406         printf("Purging %s (%s)...\n", package_name, package_version);
1407
1408         /* run prerm script */
1409         if (run_package_script(package_name, "prerm") != 0) {
1410                 bb_error_msg_and_die("script failed, prerm failure");
1411         }
1412
1413         /* Create a list of files to remove */
1414         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1415         remove_files = create_list(list_name);
1416
1417         exclude_files = xzalloc(sizeof(char*));
1418
1419         /* Some directories cant be removed straight away, so do multiple passes */
1420         while (remove_file_array(remove_files, exclude_files));
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         remove_file_array(remove_files, exclude_files);
1426         free_array(remove_files);
1427         free(exclude_files);
1428
1429         /* run postrm script */
1430         if (run_package_script(package_name, "postrm") == -1) {
1431                 bb_error_msg_and_die("postrm fialure.. set status to what?");
1432         }
1433
1434         /* Change package status */
1435         set_status(status_num, "not-installed", 3);
1436 }
1437
1438 static archive_handle_t *init_archive_deb_ar(const char *filename)
1439 {
1440         archive_handle_t *ar_handle;
1441
1442         /* Setup an ar archive handle that refers to the gzip sub archive */
1443         ar_handle = init_handle();
1444         ar_handle->filter = filter_accept_list_reassign;
1445         ar_handle->src_fd = xopen(filename, O_RDONLY);
1446
1447         return ar_handle;
1448 }
1449
1450 static void init_archive_deb_control(archive_handle_t *ar_handle)
1451 {
1452         archive_handle_t *tar_handle;
1453
1454         /* Setup the tar archive handle */
1455         tar_handle = init_handle();
1456         tar_handle->src_fd = ar_handle->src_fd;
1457
1458         /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1459 #ifdef CONFIG_FEATURE_DEB_TAR_GZ
1460         llist_add_to(&(ar_handle->accept), "control.tar.gz");
1461 #endif
1462 #ifdef CONFIG_FEATURE_DEB_TAR_BZ2
1463         llist_add_to(&(ar_handle->accept), "control.tar.bz2");
1464 #endif
1465
1466         /* Assign the tar handle as a subarchive of the ar handle */
1467         ar_handle->sub_archive = tar_handle;
1468
1469         return;
1470 }
1471
1472 static void init_archive_deb_data(archive_handle_t *ar_handle)
1473 {
1474         archive_handle_t *tar_handle;
1475
1476         /* Setup the tar archive handle */
1477         tar_handle = init_handle();
1478         tar_handle->src_fd = ar_handle->src_fd;
1479
1480         /* We don't care about control.tar.* or debian-binary, just data.tar.* */
1481 #ifdef CONFIG_FEATURE_DEB_TAR_GZ
1482         llist_add_to(&(ar_handle->accept), "data.tar.gz");
1483 #endif
1484 #ifdef CONFIG_FEATURE_DEB_TAR_BZ2
1485         llist_add_to(&(ar_handle->accept), "data.tar.bz2");
1486 #endif
1487
1488         /* Assign the tar handle as a subarchive of the ar handle */
1489         ar_handle->sub_archive = tar_handle;
1490
1491         return;
1492 }
1493
1494 static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1495 {
1496         ar_handle->sub_archive->action_data = data_extract_to_buffer;
1497         ar_handle->sub_archive->accept = myaccept;
1498         ar_handle->sub_archive->filter = filter_accept_list;
1499
1500         unpack_ar_archive(ar_handle);
1501         close(ar_handle->src_fd);
1502
1503         return ar_handle->sub_archive->buffer;
1504 }
1505
1506 static void data_extract_all_prefix(archive_handle_t *archive_handle)
1507 {
1508         char *name_ptr = archive_handle->file_header->name;
1509
1510         name_ptr += strspn(name_ptr, "./");
1511         if (name_ptr[0] != '\0') {
1512                 archive_handle->file_header->name = xasprintf("%s%s", archive_handle->buffer, name_ptr);
1513                 data_extract_all(archive_handle);
1514         }
1515         return;
1516 }
1517
1518 static void unpack_package(deb_file_t *deb_file)
1519 {
1520         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1521         const unsigned int status_num = search_status_hashtable(package_name);
1522         const unsigned int status_package_num = status_hashtable[status_num]->package;
1523         char *info_prefix;
1524         char *list_filename;
1525         archive_handle_t *archive_handle;
1526         FILE *out_stream;
1527         llist_t *accept_list = NULL;
1528         int i = 0;
1529
1530         /* If existing version, remove it first */
1531         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1532                 /* Package is already installed, remove old version first */
1533                 printf("Preparing to replace %s %s (using %s)...\n", package_name,
1534                         name_hashtable[package_hashtable[status_package_num]->version],
1535                         deb_file->filename);
1536                 remove_package(status_package_num, 0);
1537         } else {
1538                 printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1539         }
1540
1541         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1542         info_prefix = xasprintf("/var/lib/dpkg/info/%s.", package_name);
1543         archive_handle = init_archive_deb_ar(deb_file->filename);
1544         init_archive_deb_control(archive_handle);
1545
1546         while (all_control_files[i]) {
1547                 char *c = xasprintf("./%s", all_control_files[i]);
1548                 llist_add_to(&accept_list, c);
1549                 i++;
1550         }
1551         archive_handle->sub_archive->accept = accept_list;
1552         archive_handle->sub_archive->filter = filter_accept_list;
1553         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1554         archive_handle->sub_archive->buffer = info_prefix;
1555         archive_handle->sub_archive->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
1556         unpack_ar_archive(archive_handle);
1557
1558         /* Run the preinst prior to extracting */
1559         if (run_package_script(package_name, "preinst") != 0) {
1560                 /* when preinst returns exit code != 0 then quit installation process */
1561                 bb_error_msg_and_die("subprocess pre-installation script returned error");
1562         }
1563
1564         /* Extract data.tar.gz to the root directory */
1565         archive_handle = init_archive_deb_ar(deb_file->filename);
1566         init_archive_deb_data(archive_handle);
1567         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1568         archive_handle->sub_archive->buffer = "/";
1569         archive_handle->sub_archive->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
1570         unpack_ar_archive(archive_handle);
1571
1572         /* Create the list file */
1573         list_filename = xasprintf("/var/lib/dpkg/info/%s.list", package_name);
1574         out_stream = xfopen(list_filename, "w");
1575         while (archive_handle->sub_archive->passed) {
1576                 /* the leading . has been stripped by data_extract_all_prefix already */
1577                 fputs(archive_handle->sub_archive->passed->data, out_stream);
1578                 fputc('\n', out_stream);
1579                 archive_handle->sub_archive->passed = archive_handle->sub_archive->passed->link;
1580         }
1581         fclose(out_stream);
1582
1583         /* change status */
1584         set_status(status_num, "install", 1);
1585         set_status(status_num, "unpacked", 3);
1586
1587         free(info_prefix);
1588         free(list_filename);
1589 }
1590
1591 static void configure_package(deb_file_t *deb_file)
1592 {
1593         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1594         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1595         const int status_num = search_status_hashtable(package_name);
1596
1597         printf("Setting up %s (%s)...\n", package_name, package_version);
1598
1599         /* Run the postinst script */
1600         if (run_package_script(package_name, "postinst") != 0) {
1601                 /* TODO: handle failure gracefully */
1602                 bb_error_msg_and_die("postrm failure.. set status to what?");
1603         }
1604         /* Change status to reflect success */
1605         set_status(status_num, "install", 1);
1606         set_status(status_num, "installed", 3);
1607 }
1608
1609 int dpkg_main(int argc, char **argv)
1610 {
1611         deb_file_t **deb_file = NULL;
1612         status_node_t *status_node;
1613         int opt;
1614         int package_num;
1615         int dpkg_opt = 0;
1616         int deb_count = 0;
1617         int state_status;
1618         int status_num;
1619         int i;
1620
1621         name_hashtable = xzalloc(sizeof(name_hashtable[0]) * (NAME_HASH_PRIME + 1));
1622         package_hashtable = xzalloc(sizeof(package_hashtable[0]) * (PACKAGE_HASH_PRIME + 1));
1623         status_hashtable = xzalloc(sizeof(status_hashtable[0]) * (STATUS_HASH_PRIME + 1));
1624
1625         while ((opt = getopt(argc, argv, "CF:ilPru")) != -1) {
1626                 switch (opt) {
1627                         case 'C': // equivalent to --configure in official dpkg
1628                                 dpkg_opt |= dpkg_opt_configure;
1629                                 dpkg_opt |= dpkg_opt_package_name;
1630                                 break;
1631                         case 'F': // equivalent to --force in official dpkg
1632                                 if (strcmp(optarg, "depends") == 0) {
1633                                         dpkg_opt |= dpkg_opt_force_ignore_depends;
1634                                 }
1635                                 break;
1636                         case 'i':
1637                                 dpkg_opt |= dpkg_opt_install;
1638                                 dpkg_opt |= dpkg_opt_filename;
1639                                 break;
1640                         case 'l':
1641                                 dpkg_opt |= dpkg_opt_list_installed;
1642                                 break;
1643                         case 'P':
1644                                 dpkg_opt |= dpkg_opt_purge;
1645                                 dpkg_opt |= dpkg_opt_package_name;
1646                                 break;
1647                         case 'r':
1648                                 dpkg_opt |= dpkg_opt_remove;
1649                                 dpkg_opt |= dpkg_opt_package_name;
1650                                 break;
1651                         case 'u':       /* Equivalent to --unpack in official dpkg */
1652                                 dpkg_opt |= dpkg_opt_unpack;
1653                                 dpkg_opt |= dpkg_opt_filename;
1654                                 break;
1655                         default:
1656                                 bb_show_usage();
1657                 }
1658         }
1659         /* check for non-option argument if expected  */
1660         if ((dpkg_opt == 0) || ((argc == optind) && !(dpkg_opt && dpkg_opt_list_installed))) {
1661                 bb_show_usage();
1662         }
1663
1664 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1665         index_status_file("/var/lib/dpkg/status");
1666
1667         /* if the list action was given print the installed packages and exit */
1668         if (dpkg_opt & dpkg_opt_list_installed) {
1669                 list_packages();
1670                 return EXIT_SUCCESS;
1671         }
1672
1673         /* Read arguments and store relevant info in structs */
1674         while (optind < argc) {
1675                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1676                 deb_file = xrealloc(deb_file, sizeof(deb_file_t *) * (deb_count + 2));
1677                 deb_file[deb_count] = (deb_file_t *) xzalloc(sizeof(deb_file_t));
1678                 if (dpkg_opt & dpkg_opt_filename) {
1679                         archive_handle_t *archive_handle;
1680                         llist_t *control_list = NULL;
1681
1682                         /* Extract the control file */
1683                         llist_add_to(&control_list, "./control");
1684                         archive_handle = init_archive_deb_ar(argv[optind]);
1685                         init_archive_deb_control(archive_handle);
1686                         deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1687                         if (deb_file[deb_count]->control_file == NULL) {
1688                                 bb_error_msg_and_die("cannot extract control file");
1689                         }
1690                         deb_file[deb_count]->filename = xstrdup(argv[optind]);
1691                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1692
1693                         if (package_num == -1) {
1694                                 bb_error_msg("invalid control file in %s", argv[optind]);
1695                                 optind++;
1696                                 continue;
1697                         }
1698                         deb_file[deb_count]->package = (unsigned int) package_num;
1699
1700                         /* Add the package to the status hashtable */
1701                         if ((dpkg_opt & dpkg_opt_unpack) || (dpkg_opt & dpkg_opt_install)) {
1702                                 /* Try and find a currently installed version of this package */
1703                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1704                                 /* If no previous entry was found initialise a new entry */
1705                                 if ((status_hashtable[status_num] == NULL) ||
1706                                         (status_hashtable[status_num]->status == 0)) {
1707                                         status_node = (status_node_t *) xmalloc(sizeof(status_node_t));
1708                                         status_node->package = deb_file[deb_count]->package;
1709                                         /* reinstreq isnt changed to "ok" until the package control info
1710                                          * is written to the status file*/
1711                                         status_node->status = search_name_hashtable("install reinstreq not-installed");
1712                                         status_hashtable[status_num] = status_node;
1713                                 } else {
1714                                         set_status(status_num, "install", 1);
1715                                         set_status(status_num, "reinstreq", 2);
1716                                 }
1717                         }
1718                 }
1719                 else if (dpkg_opt & dpkg_opt_package_name) {
1720                         deb_file[deb_count]->package = search_package_hashtable(
1721                                 search_name_hashtable(argv[optind]),
1722                                 search_name_hashtable("ANY"), VER_ANY);
1723                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1724                                 bb_error_msg_and_die("package %s is uninstalled or unknown", argv[optind]);
1725                         }
1726                         package_num = deb_file[deb_count]->package;
1727                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1728                         state_status = get_status(status_num, 3);
1729
1730                         /* check package status is "installed" */
1731                         if (dpkg_opt & dpkg_opt_remove) {
1732                                 if ((strcmp(name_hashtable[state_status], "not-installed") == 0) ||
1733                                         (strcmp(name_hashtable[state_status], "config-files") == 0)) {
1734                                         bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1735                                 }
1736                                 set_status(status_num, "deinstall", 1);
1737                         }
1738                         else if (dpkg_opt & dpkg_opt_purge) {
1739                                 /* if package status is "conf-files" then its ok */
1740                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1741                                         bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1742                                 }
1743                                 set_status(status_num, "purge", 1);
1744                         }
1745                 }
1746                 deb_count++;
1747                 optind++;
1748         }
1749         deb_file[deb_count] = NULL;
1750
1751         /* Check that the deb file arguments are installable */
1752         if ((dpkg_opt & dpkg_opt_force_ignore_depends) != dpkg_opt_force_ignore_depends) {
1753                 if (!check_deps(deb_file, 0, deb_count)) {
1754                         bb_error_msg_and_die("dependency check failed");
1755                 }
1756         }
1757
1758         /* TODO: install or remove packages in the correct dependency order */
1759         for (i = 0; i < deb_count; i++) {
1760                 /* Remove or purge packages */
1761                 if (dpkg_opt & dpkg_opt_remove) {
1762                         remove_package(deb_file[i]->package, 1);
1763                 }
1764                 else if (dpkg_opt & dpkg_opt_purge) {
1765                         purge_package(deb_file[i]->package);
1766                 }
1767                 else if (dpkg_opt & dpkg_opt_unpack) {
1768                         unpack_package(deb_file[i]);
1769                 }
1770                 else if (dpkg_opt & dpkg_opt_install) {
1771                         unpack_package(deb_file[i]);
1772                         /* package is configured in second pass below */
1773                 }
1774                 else if (dpkg_opt & dpkg_opt_configure) {
1775                         configure_package(deb_file[i]);
1776                 }
1777         }
1778         /* configure installed packages */
1779         if (dpkg_opt & dpkg_opt_install) {
1780                 for (i = 0; i < deb_count; i++)
1781                         configure_package(deb_file[i]);
1782         }
1783
1784         write_status_file(deb_file);
1785
1786         if (ENABLE_FEATURE_CLEAN_UP) {
1787                 for (i = 0; i < deb_count; i++) {
1788                         free(deb_file[i]->control_file);
1789                         free(deb_file[i]->filename);
1790                         free(deb_file[i]);
1791                 }
1792
1793                 free(deb_file);
1794
1795                 for (i = 0; i < NAME_HASH_PRIME; i++) {
1796                         free(name_hashtable[i]);
1797                 }
1798
1799                 for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1800                         if (package_hashtable[i] != NULL) {
1801                                 free_package(package_hashtable[i]);
1802                         }
1803                 }
1804
1805                 for (i = 0; i < STATUS_HASH_PRIME; i++) {
1806                         free(status_hashtable[i]);
1807                 }
1808
1809                 free(status_hashtable);
1810                 free(package_hashtable);
1811                 free(name_hashtable);
1812         }
1813
1814         return EXIT_SUCCESS;
1815 }