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, 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 operator:3;
  57         unsigned type:4;
  58         unsigned name:14;
  59         unsigned version:14;
  60 } edge_t;
  61
  62 typedef struct common_node_s {
  63         unsigned name:14;
  64         unsigned version:14;
  65         unsigned 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 package:14;    /* has to fit PACKAGE_HASH_PRIME */
  75         unsigned 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 typedef struct deb_file_s {
 108         char *control_file;
 109         char *filename;
 110         unsigned package:14;
 111 } deb_file_t;
 112
 113
 114 static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
 115 {
 116         unsigned long int hash_num = key[0];
 117         int len = strlen(key);
 118         int i;
 119
 120         /* Maybe i should have uses a "proper" hashing algorithm here instead
 121          * of making one up myself, seems to be working ok though. */
 122         for (i = 1; i < len; i++) {
 123                 /* shifts the ascii based value and adds it to previous value
 124                  * shift amount is mod 24 because long int is 32 bit and data
 125                  * to be shifted is 8, don't want to shift data to where it has
 126                  * no effect*/
 127                 hash_num += ((key[i] + key[i-1]) << ((key[i] * i) % 24));
 128         }
 129         *start = (unsigned) hash_num % hash_prime;
 130         *decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
 131 }
 132
 133 /* this adds the key to the hash table */
 134 static int search_name_hashtable(const char *key)
 135 {
 136         unsigned probe_address = 0;
 137         unsigned probe_decrement = 0;
 138
 139         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 140         while (name_hashtable[probe_address] != NULL) {
 141                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 142                         return probe_address;
 143                 }
 144                 probe_address -= probe_decrement;
 145                 if ((int)probe_address < 0) {
 146                         probe_address += NAME_HASH_PRIME;
 147                 }
 148         }
 149         name_hashtable[probe_address] = xstrdup(key);
 150         return probe_address;
 151 }
 152
 153 /* this DOESNT add the key to the hashtable
 154  * TODO make it consistent with search_name_hashtable
 155  */
 156 static unsigned search_status_hashtable(const char *key)
 157 {
 158         unsigned probe_address = 0;
 159         unsigned probe_decrement = 0;
 160
 161         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 162         while (status_hashtable[probe_address] != NULL) {
 163                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 164                         break;
 165                 }
 166                 probe_address -= probe_decrement;
 167                 if ((int)probe_address < 0) {
 168                         probe_address += STATUS_HASH_PRIME;
 169                 }
 170         }
 171         return probe_address;
 172 }
 173
 174 /* Need to rethink version comparison, maybe the official dpkg has something i can use ? */
 175 static int version_compare_part(const char *version1, const char *version2)
 176 {
 177         int upstream_len1 = 0;
 178         int upstream_len2 = 0;
 179         char *name1_char;
 180         char *name2_char;
 181         int len1 = 0;
 182         int len2 = 0;
 183         int tmp_int;
 184         int ver_num1;
 185         int ver_num2;
 186
 187         if (version1 == NULL) {
 188                 version1 = xstrdup("");
 189         }
 190         if (version2 == NULL) {
 191                 version2 = xstrdup("");
 192         }
 193         upstream_len1 = strlen(version1);
 194         upstream_len2 = strlen(version2);
 195
 196         while ((len1 < upstream_len1) || (len2 < upstream_len2)) {
 197                 /* Compare non-digit section */
 198                 tmp_int = strcspn(&version1[len1], "0123456789");
 199                 name1_char = xstrndup(&version1[len1], tmp_int);
 200                 len1 += tmp_int;
 201                 tmp_int = strcspn(&version2[len2], "0123456789");
 202                 name2_char = xstrndup(&version2[len2], tmp_int);
 203                 len2 += tmp_int;
 204                 tmp_int = strcmp(name1_char, name2_char);
 205                 free(name1_char);
 206                 free(name2_char);
 207                 if (tmp_int != 0) {
 208                         return tmp_int;
 209                 }
 210
 211                 /* Compare digits */
 212                 tmp_int = strspn(&version1[len1], "0123456789");
 213                 name1_char = xstrndup(&version1[len1], tmp_int);
 214                 len1 += tmp_int;
 215                 tmp_int = strspn(&version2[len2], "0123456789");
 216                 name2_char = xstrndup(&version2[len2], tmp_int);
 217                 len2 += tmp_int;
 218                 ver_num1 = atoi(name1_char);
 219                 ver_num2 = atoi(name2_char);
 220                 free(name1_char);
 221                 free(name2_char);
 222                 if (ver_num1 < ver_num2) {
 223                         return -1;
 224                 }
 225                 if (ver_num1 > ver_num2) {
 226                         return 1;
 227                 }
 228         }
 229         return 0;
 230 }
 231
 232 /* if ver1 < ver2 return -1,
 233  * if ver1 = ver2 return 0,
 234  * if ver1 > ver2 return 1,
 235  */
 236 static int version_compare(const unsigned ver1, const unsigned ver2)
 237 {
 238         char *ch_ver1 = name_hashtable[ver1];
 239         char *ch_ver2 = name_hashtable[ver2];
 240
 241         char epoch1, epoch2;
 242         char *deb_ver1, *deb_ver2;
 243         char *ver1_ptr, *ver2_ptr;
 244         char *upstream_ver1;
 245         char *upstream_ver2;
 246         int result;
 247
 248         /* Compare epoch */
 249         if (ch_ver1[1] == ':') {
 250                 epoch1 = ch_ver1[0];
 251                 ver1_ptr = strchr(ch_ver1, ':') + 1;
 252         } else {
 253                 epoch1 = '0';
 254                 ver1_ptr = ch_ver1;
 255         }
 256         if (ch_ver2[1] == ':') {
 257                 epoch2 = ch_ver2[0];
 258                 ver2_ptr = strchr(ch_ver2, ':') + 1;
 259         } else {
 260                 epoch2 = '0';
 261                 ver2_ptr = ch_ver2;
 262         }
 263         if (epoch1 < epoch2) {
 264                 return -1;
 265         }
 266         else if (epoch1 > epoch2) {
 267                 return 1;
 268         }
 269
 270         /* Compare upstream version */
 271         upstream_ver1 = xstrdup(ver1_ptr);
 272         upstream_ver2 = xstrdup(ver2_ptr);
 273
 274         /* Chop off debian version, and store for later use */
 275         deb_ver1 = strrchr(upstream_ver1, '-');
 276         deb_ver2 = strrchr(upstream_ver2, '-');
 277         if (deb_ver1) {
 278                 deb_ver1[0] = '\0';
 279                 deb_ver1++;
 280         }
 281         if (deb_ver2) {
 282                 deb_ver2[0] = '\0';
 283                 deb_ver2++;
 284         }
 285         result = version_compare_part(upstream_ver1, upstream_ver2);
 286         if (!result)
 287                 /* Compare debian versions */
 288                 result = version_compare_part(deb_ver1, deb_ver2);
 289
 290         free(upstream_ver1);
 291         free(upstream_ver2);
 292         return result;
 293 }
 294
 295 static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
 296 {
 297         const int version_result = version_compare(version1, version2);
 298         switch (operator) {
 299         case VER_ANY:
 300                 return TRUE;
 301         case VER_EQUAL:
 302                 return (version_result == 0);
 303         case VER_LESS:
 304                 return (version_result < 0);
 305         case VER_LESS_EQUAL:
 306                 return (version_result <= 0);
 307         case VER_MORE:
 308                 return (version_result > 0);
 309         case VER_MORE_EQUAL:
 310                 return (version_result >= 0);
 311         }
 312         return FALSE;
 313 }
 314
 315
 316 static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
 317 {
 318         unsigned probe_address = 0;
 319         unsigned probe_decrement = 0;
 320
 321         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 322         while (package_hashtable[probe_address] != NULL) {
 323                 if (package_hashtable[probe_address]->name == name) {
 324                         if (operator == VER_ANY) {
 325                                 return probe_address;
 326                         }
 327                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 328                                 return probe_address;
 329                         }
 330                 }
 331                 probe_address -= probe_decrement;
 332                 if ((int)probe_address < 0) {
 333                         probe_address += PACKAGE_HASH_PRIME;
 334                 }
 335         }
 336         return probe_address;
 337 }
 338
 339 /*
 340  * This function searches through the entire package_hashtable looking
 341  * for a package which provides "needle". It returns the index into
 342  * the package_hashtable for the providing package.
 343  *
 344  * needle is the index into name_hashtable of the package we are
 345  * looking for.
 346  *
 347  * start_at is the index in the package_hashtable to start looking
 348  * at. If start_at is -1 then start at the beginning. This is to allow
 349  * for repeated searches since more than one package might provide
 350  * needle.
 351  *
 352  * FIXME: I don't think this is very efficient, but I thought I'd keep
 353  * it simple for now until it proves to be a problem.
 354  */
 355 static int search_for_provides(int needle, int start_at) {
 356         int i, j;
 357         common_node_t *p;
 358         for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
 359                 p = package_hashtable[i];
 360                 if (p == NULL)
 361                         continue;
 362                 for (j = 0; j < p->num_of_edges; j++)
 363                         if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
 364                                 return i;
 365         }
 366         return -1;
 367 }
 368
 369 /*
 370  * Add an edge to a node
 371  */
 372 static void add_edge_to_node(common_node_t *node, edge_t *edge)
 373 {
 374         node->num_of_edges++;
 375         node->edge = xrealloc(node->edge, sizeof(edge_t) * (node->num_of_edges + 1));
 376         node->edge[node->num_of_edges - 1] = edge;
 377 }
 378
 379 /*
 380  * Create one new node and one new edge for every dependency.
 381  *
 382  * Dependencies which contain multiple alternatives are represented as
 383  * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
 384  * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
 385  * the OR edge contains the full dependency string while the version
 386  * field contains the number of EDGE nodes which follow as part of
 387  * this alternative.
 388  */
 389 static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
 390 {
 391         char *line = xstrdup(whole_line);
 392         char *line2;
 393         char *line_ptr1 = NULL;
 394         char *line_ptr2 = NULL;
 395         char *field;
 396         char *field2;
 397         char *version;
 398         edge_t *edge;
 399         edge_t *or_edge;
 400         int offset_ch;
 401
 402         field = strtok_r(line, ",", &line_ptr1);
 403         do {
 404                 /* skip leading spaces */
 405                 field += strspn(field, " ");
 406                 line2 = xstrdup(field);
 407                 field2 = strtok_r(line2, "|", &line_ptr2);
 408                 or_edge = NULL;
 409                 if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
 410                  && (strcmp(field, field2) != 0)
 411                 ) {
 412                         or_edge = xmalloc(sizeof(edge_t));
 413                         or_edge->type = edge_type + 1;
 414                         or_edge->name = search_name_hashtable(field);
 415                         or_edge->version = 0; // tracks the number of altenatives
 416                         add_edge_to_node(parent_node, or_edge);
 417                 }
 418
 419                 do {
 420                         edge = xmalloc(sizeof(edge_t));
 421                         edge->type = edge_type;
 422
 423                         /* Skip any extra leading spaces */
 424                         field2 += strspn(field2, " ");
 425
 426                         /* Get dependency version info */
 427                         version = strchr(field2, '(');
 428                         if (version == NULL) {
 429                                 edge->operator = VER_ANY;
 430                                 /* Get the versions hash number, adding it if the number isnt already in there */
 431                                 edge->version = search_name_hashtable("ANY");
 432                         } else {
 433                                 /* Skip leading ' ' or '(' */
 434                                 version += strspn(field2, " (");
 435                                 /* Calculate length of any operator characters */
 436                                 offset_ch = strspn(version, "<=>");
 437                                 /* Determine operator */
 438                                 if (offset_ch > 0) {
 439                                         if (strncmp(version, "=", offset_ch) == 0) {
 440                                                 edge->operator = VER_EQUAL;
 441                                         }
 442                                         else if (strncmp(version, "<<", offset_ch) == 0) {
 443                                                 edge->operator = VER_LESS;
 444                                         }
 445                                         else if (strncmp(version, "<=", offset_ch) == 0) {
 446                                                 edge->operator = VER_LESS_EQUAL;
 447                                         }
 448                                         else if (strncmp(version, ">>", offset_ch) == 0) {
 449                                                 edge->operator = VER_MORE;
 450                                         }
 451                                         else if (strncmp(version, ">=", offset_ch) == 0) {
 452                                                 edge->operator = VER_MORE_EQUAL;
 453                                         } else {
 454                                                 bb_error_msg_and_die("illegal operator");
 455                                         }
 456                                 }
 457                                 /* skip to start of version numbers */
 458                                 version += offset_ch;
 459                                 version += strspn(version, " ");
 460
 461                                 /* Truncate version at trailing ' ' or ')' */
 462                                 version[strcspn(version, " )")] = '\0';
 463                                 /* Get the versions hash number, adding it if the number isnt already in there */
 464                                 edge->version = search_name_hashtable(version);
 465                         }
 466
 467                         /* Get the dependency name */
 468                         field2[strcspn(field2, " (")] = '\0';
 469                         edge->name = search_name_hashtable(field2);
 470
 471                         if (or_edge)
 472                                 or_edge->version++;
 473
 474                         add_edge_to_node(parent_node, edge);
 475                 } while ((field2 = strtok_r(NULL, "|", &line_ptr2)) != NULL);
 476                 free(line2);
 477         } while ((field = strtok_r(NULL, ",", &line_ptr1)) != NULL);
 478         free(line);
 479 }
 480
 481 static void free_package(common_node_t *node)
 482 {
 483         unsigned i;
 484         if (node) {
 485                 for (i = 0; i < node->num_of_edges; i++) {
 486                         free(node->edge[i]);
 487                 }
 488                 free(node->edge);
 489                 free(node);
 490         }
 491 }
 492
 493 /*
 494  * Gets the next package field from package_buffer, seperated into the field name
 495  * and field value, it returns the int offset to the first character of the next field
 496  */
 497 static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
 498 {
 499         int offset_name_start = 0;
 500         int offset_name_end = 0;
 501         int offset_value_start = 0;
 502         int offset_value_end = 0;
 503         int offset = 0;
 504         int next_offset;
 505         int name_length;
 506         int value_length;
 507         int exit_flag = FALSE;
 508
 509         if (package_buffer == NULL) {
 510                 *field_name = NULL;
 511                 *field_value = NULL;
 512                 return -1;
 513         }
 514         while (1) {
 515                 next_offset = offset + 1;
 516                 switch (package_buffer[offset]) {
 517                         case '\0':
 518                                 exit_flag = TRUE;
 519                                 break;
 520                         case ':':
 521                                 if (offset_name_end == 0) {
 522                                         offset_name_end = offset;
 523                                         offset_value_start = next_offset;
 524                                 }
 525                                 /* TODO: Name might still have trailing spaces if ':' isnt
 526                                  * immediately after name */
 527                                 break;
 528                         case '\n':
 529                                 /* TODO: The char next_offset may be out of bounds */
 530                                 if (package_buffer[next_offset] != ' ') {
 531                                         exit_flag = TRUE;
 532                                         break;
 533                                 }
 534                         case '\t':
 535                         case ' ':
 536                                 /* increment the value start point if its a just filler */
 537                                 if (offset_name_start == offset) {
 538                                         offset_name_start++;
 539                                 }
 540                                 if (offset_value_start == offset) {
 541                                         offset_value_start++;
 542                                 }
 543                                 break;
 544                 }
 545                 if (exit_flag) {
 546                         /* Check that the names are valid */
 547                         offset_value_end = offset;
 548                         name_length = offset_name_end - offset_name_start;
 549                         value_length = offset_value_end - offset_value_start;
 550                         if (name_length == 0) {
 551                                 break;
 552                         }
 553                         if ((name_length > 0) && (value_length > 0)) {
 554                                 break;
 555                         }
 556
 557                         /* If not valid, start fresh with next field */
 558                         exit_flag = FALSE;
 559                         offset_name_start = offset + 1;
 560                         offset_name_end = 0;
 561                         offset_value_start = offset + 1;
 562                         offset_value_end = offset + 1;
 563                         offset++;
 564                 }
 565                 offset++;
 566         }
 567         *field_name = NULL;
 568         if (name_length) {
 569                 *field_name = xstrndup(&package_buffer[offset_name_start], name_length);
 570         }
 571         *field_value = NULL;
 572         if (value_length > 0) {
 573                 *field_value = xstrndup(&package_buffer[offset_value_start], value_length);
 574         }
 575         return next_offset;
 576 }
 577
 578 static unsigned fill_package_struct(char *control_buffer)
 579 {
 580         static const char *const field_names[] = { "Package", "Version",
 581                 "Pre-Depends", "Depends","Replaces", "Provides",
 582                 "Conflicts", "Suggests", "Recommends", "Enhances", 0
 583         };
 584
 585         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 586         char *field_name;
 587         char *field_value;
 588         int field_start = 0;
 589         int num = -1;
 590         int buffer_length = strlen(control_buffer);
 591
 592         new_node->version = search_name_hashtable("unknown");
 593         while (field_start < buffer_length) {
 594                 unsigned field_num;
 595
 596                 field_start += read_package_field(&control_buffer[field_start],
 597                                 &field_name, &field_value);
 598
 599                 if (field_name == NULL) {
 600                         goto fill_package_struct_cleanup; /* Oh no, the dreaded goto statement ! */
 601                 }
 602
 603                 field_num = index_in_str_array(field_names, field_name);
 604                 switch (field_num) {
 605                 case 0: /* Package */
 606                         new_node->name = search_name_hashtable(field_value);
 607                         break;
 608                 case 1: /* Version */
 609                         new_node->version = search_name_hashtable(field_value);
 610                         break;
 611                 case 2: /* Pre-Depends */
 612                         add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 613                         break;
 614                 case 3: /* Depends */
 615                         add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 616                         break;
 617                 case 4: /* Replaces */
 618                         add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 619                         break;
 620                 case 5: /* Provides */
 621                         add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 622                         break;
 623                 case 6: /* Conflicts */
 624                         add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 625                         break;
 626                 case 7: /* Suggests */
 627                         add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 628                         break;
 629                 case 8: /* Recommends */
 630                         add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 631                         break;
 632                 case 9: /* Enhances */
 633                         add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 634                         break;
 635                 }
 636  fill_package_struct_cleanup:
 637                 free(field_name);
 638                 free(field_value);
 639         }
 640
 641         if (new_node->version == search_name_hashtable("unknown")) {
 642                 free_package(new_node);
 643                 return -1;
 644         }
 645         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 646         if (package_hashtable[num] != NULL)
 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 */
 653 static 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
 675 static 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
 709 static const char *describe_status(int status_num) {
 710         int status_want, status_state ;
 711         if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
 712                 return "is not installed or flagged to be installed\n";
 713
 714         status_want = get_status(status_num, 1);
 715         status_state = get_status(status_num, 3);
 716
 717         if (status_state == search_name_hashtable("installed")) {
 718                 if (status_want == search_name_hashtable("install"))
 719                         return "is installed";
 720                 if (status_want == search_name_hashtable("deinstall"))
 721                         return "is marked to be removed";
 722                 if (status_want == search_name_hashtable("purge"))
 723                         return "is marked to be purged";
 724         }
 725         if (status_want ==  search_name_hashtable("unknown"))
 726                 return "is in an indeterminate state";
 727         if (status_want == search_name_hashtable("install"))
 728                 return "is marked to be installed";
 729
 730         return "is not installed or flagged to be installed";
 731 }
 732
 733
 734 static 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(filename, "r");
 743         while ((control_buffer = xmalloc_fgets_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
 765 static 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 */
 782 static void write_status_file(deb_file_t **deb_file)
 783 {
 784         FILE *old_status_file = xfopen("/var/lib/dpkg/status", "r");
 785         FILE *new_status_file = xfopen("/var/lib/dpkg/status.udeb", "w");
 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_fgets_str(old_status_file, "\n\n")) != NULL) {
 797                 if ((tmp_string = strstr(control_buffer, "Package:")) == NULL) {
 798                         continue;
 799                 }
 800
 801                 tmp_string += 8;
 802                 tmp_string += strspn(tmp_string, " \n\t");
 803                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 804                 write_flag = FALSE;
 805                 tmp_string = strstr(control_buffer, "Status:");
 806                 if (tmp_string != NULL) {
 807                         /* Seperate the status value from the control buffer */
 808                         tmp_string += 7;
 809                         tmp_string += strspn(tmp_string, " \n\t");
 810                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 811                 } else {
 812                         status_from_file = NULL;
 813                 }
 814
 815                 /* Find this package in the status hashtable */
 816                 status_num = search_status_hashtable(package_name);
 817                 if (status_hashtable[status_num] != NULL) {
 818                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 819                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 820                                 /* New status isnt exactly the same as old status */
 821                                 const int state_status = get_status(status_num, 3);
 822                                 if ((strcmp("installed", name_hashtable[state_status]) == 0) ||
 823                                         (strcmp("unpacked", name_hashtable[state_status]) == 0)) {
 824                                         /* We need to add the control file from the package */
 825                                         i = 0;
 826                                         while (deb_file[i] != NULL) {
 827                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 828                                                         /* Write a status file entry with a modified status */
 829                                                         /* remove trailing \n's */
 830                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 831                                                         set_status(status_num, "ok", 2);
 832                                                         fprintf(new_status_file, "Status: %s\n\n",
 833                                                                         name_hashtable[status_hashtable[status_num]->status]);
 834                                                         write_flag = TRUE;
 835                                                         break;
 836                                                 }
 837                                                 i++;
 838                                         }
 839                                         /* This is temperary, debugging only */
 840                                         if (deb_file[i] == NULL) {
 841                                                 bb_error_msg_and_die("ALERT: cannot find a control file, "
 842                                                         "your status file may be broken, status may be "
 843                                                         "incorrect for %s", package_name);
 844                                         }
 845                                 }
 846                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 847                                         /* Only write the Package, Status, Priority and Section lines */
 848                                         fprintf(new_status_file, "Package: %s\n", package_name);
 849                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 850
 851                                         while (1) {
 852                                                 char *field_name;
 853                                                 char *field_value;
 854                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 855                                                 if (field_name == NULL) {
 856                                                         break;
 857                                                 }
 858                                                 if ((strcmp(field_name, "Priority") == 0) ||
 859                                                         (strcmp(field_name, "Section") == 0)) {
 860                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 861                                                 }
 862                                         }
 863                                         write_flag = TRUE;
 864                                         fputs("\n", new_status_file);
 865                                 }
 866                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 867                                         /* only change the status line */
 868                                         while (1) {
 869                                                 char *field_name;
 870                                                 char *field_value;
 871                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 872                                                 if (field_name == NULL) {
 873                                                         break;
 874                                                 }
 875                                                 /* Setup start point for next field */
 876                                                 if (strcmp(field_name, "Status") == 0) {
 877                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 878                                                 } else {
 879                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 880                                                 }
 881                                         }
 882                                         write_flag = TRUE;
 883                                         fputs("\n", new_status_file);
 884                                 }
 885                         }
 886                 }
 887                 /* If the package from the status file wasnt handle above, do it now*/
 888                 if (! write_flag) {
 889                         fprintf(new_status_file, "%s\n\n", control_buffer);
 890                 }
 891
 892                 free(status_from_file);
 893                 free(package_name);
 894                 free(control_buffer);
 895         }
 896
 897         /* Write any new packages */
 898         for (i = 0; deb_file[i] != NULL; i++) {
 899                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 900                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 901                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 902                         set_status(status_num, "ok", 2);
 903                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 904                 }
 905         }
 906         fclose(old_status_file);
 907         fclose(new_status_file);
 908
 909
 910         /* Create a separate backfile to dpkg */
 911         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 912                 struct stat stat_buf;
 913                 xstat("/var/lib/dpkg/status", &stat_buf);
 914                 /* Its ok if renaming the status file fails because status
 915                  * file doesnt exist, maybe we are starting from scratch */
 916                 bb_error_msg("no status file found, creating new one");
 917         }
 918
 919         if (rename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status") == -1) {
 920                 bb_error_msg_and_die("DANGER: cannot create status file, "
 921                         "you need to manually repair your status file");
 922         }
 923 }
 924
 925 /* This function returns TRUE if the given package can satisfy a
 926  * dependency of type depend_type.
 927  *
 928  * A pre-depends is satisfied only if a package is already installed,
 929  * which a regular depends can be satisfied by a package which we want
 930  * to install.
 931  */
 932 static int package_satisfies_dependency(int package, int depend_type)
 933 {
 934         int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
 935
 936         /* status could be unknown if package is a pure virtual
 937          * provides which cannot satisfy any dependency by itself.
 938          */
 939         if (status_hashtable[status_num] == NULL)
 940                 return 0;
 941
 942         switch (depend_type) {
 943         case EDGE_PRE_DEPENDS:  return get_status(status_num, 3) == search_name_hashtable("installed");
 944         case EDGE_DEPENDS:      return get_status(status_num, 1) == search_name_hashtable("install");
 945         }
 946         return 0;
 947 }
 948
 949 static int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
 950 {
 951         int *conflicts = NULL;
 952         int conflicts_num = 0;
 953         int i = deb_start;
 954         int j;
 955
 956         /* Check for conflicts
 957          * TODO: TEST if conflicts with other packages to be installed
 958          *
 959          * Add install packages and the packages they provide
 960          * to the list of files to check conflicts for
 961          */
 962
 963         /* Create array of package numbers to check against
 964          * installed package for conflicts*/
 965         while (deb_file[i] != NULL) {
 966                 const unsigned package_num = deb_file[i]->package;
 967                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
 968                 conflicts[conflicts_num] = package_num;
 969                 conflicts_num++;
 970                 /* add provides to conflicts list */
 971                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
 972                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
 973                                 const int conflicts_package_num = search_package_hashtable(
 974                                         package_hashtable[package_num]->edge[j]->name,
 975                                         package_hashtable[package_num]->edge[j]->version,
 976                                         package_hashtable[package_num]->edge[j]->operator);
 977                                 if (package_hashtable[conflicts_package_num] == NULL) {
 978                                         /* create a new package */
 979                                         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 980                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
 981                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
 982                                         package_hashtable[conflicts_package_num] = new_node;
 983                                 }
 984                                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
 985                                 conflicts[conflicts_num] = conflicts_package_num;
 986                                 conflicts_num++;
 987                         }
 988                 }
 989                 i++;
 990         }
 991
 992         /* Check conflicts */
 993         i = 0;
 994         while (deb_file[i] != NULL) {
 995                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
 996                 int status_num = 0;
 997                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
 998
 999                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
1000                         i++;
1001                         continue;
1002                 }
1003
1004                 for (j = 0; j < package_node->num_of_edges; j++) {
1005                         const edge_t *package_edge = package_node->edge[j];
1006
1007                         if (package_edge->type == EDGE_CONFLICTS) {
1008                                 const unsigned package_num =
1009                                         search_package_hashtable(package_edge->name,
1010                                                                  package_edge->version,
1011                                                                  package_edge->operator);
1012                                 int result = 0;
1013                                 if (package_hashtable[package_num] != NULL) {
1014                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1015
1016                                         if (get_status(status_num, 1) == search_name_hashtable("install")) {
1017                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
1018                                                         package_edge->version, package_edge->operator);
1019                                         }
1020                                 }
1021
1022                                 if (result) {
1023                                         bb_error_msg_and_die("package %s conflicts with %s",
1024                                                 name_hashtable[package_node->name],
1025                                                 name_hashtable[package_edge->name]);
1026                                 }
1027                         }
1028                 }
1029                 i++;
1030         }
1031
1032
1033         /* Check dependendcies */
1034         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1035                 int status_num = 0;
1036                 int number_of_alternatives = 0;
1037                 const edge_t * root_of_alternatives = NULL;
1038                 const common_node_t *package_node = package_hashtable[i];
1039
1040                 /* If the package node does not exist then this
1041                  * package is a virtual one. In which case there are
1042                  * no dependencies to check.
1043                  */
1044                 if (package_node == NULL) continue;
1045
1046                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1047
1048                 /* If there is no status then this package is a
1049                  * virtual one provided by something else. In which
1050                  * case there are no dependencies to check.
1051                  */
1052                 if (status_hashtable[status_num] == NULL) continue;
1053
1054                 /* If we don't want this package installed then we may
1055                  * as well ignore it's dependencies.
1056                  */
1057                 if (get_status(status_num, 1) != search_name_hashtable("install")) {
1058                         continue;
1059                 }
1060
1061                 /* This code is tested only for EDGE_DEPENDS, since I
1062                  * have no suitable pre-depends available. There is no
1063                  * reason that it shouldn't work though :-)
1064                  */
1065                 for (j = 0; j < package_node->num_of_edges; j++) {
1066                         const edge_t *package_edge = package_node->edge[j];
1067                         unsigned package_num;
1068
1069                         if (package_edge->type == EDGE_OR_PRE_DEPENDS ||
1070                             package_edge->type == EDGE_OR_DEPENDS) {    /* start an EDGE_OR_ list */
1071                                 number_of_alternatives = package_edge->version;
1072                                 root_of_alternatives = package_edge;
1073                                 continue;
1074                         } else if (number_of_alternatives == 0) {       /* not in the middle of an EDGE_OR_ list */
1075                                 number_of_alternatives = 1;
1076                                 root_of_alternatives = NULL;
1077                         }
1078
1079                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1080
1081                         if (package_edge->type == EDGE_PRE_DEPENDS ||
1082                             package_edge->type == EDGE_DEPENDS) {
1083                                 int result=1;
1084                                 status_num = 0;
1085
1086                                 /* If we are inside an alternative then check
1087                                  * this edge is the right type.
1088                                  *
1089                                  * EDGE_DEPENDS == OR_DEPENDS -1
1090                                  * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1091                                  */
1092                                 if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1093                                         bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1094                                                              package_edge->type, root_of_alternatives->type);
1095
1096                                 if (package_hashtable[package_num] != NULL)
1097                                         result = !package_satisfies_dependency(package_num, package_edge->type);
1098
1099                                 if (result) { /* check for other package which provide what we are looking for */
1100                                         int provider = -1;
1101
1102                                         while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1103                                                 if (package_hashtable[provider] == NULL) {
1104                                                         puts("Have a provider but no package information for it");
1105                                                         continue;
1106                                                 }
1107                                                 result = !package_satisfies_dependency(provider, package_edge->type);
1108
1109                                                 if (result == 0)
1110                                                         break;
1111                                         }
1112                                 }
1113
1114                                 /* It must be already installed, or to be installed */
1115                                 number_of_alternatives--;
1116                                 if (result && number_of_alternatives == 0) {
1117                                         if (root_of_alternatives)
1118                                                 bb_error_msg_and_die(
1119                                                         "package %s %sdepends on %s, "
1120                                                         "which cannot be satisfied",
1121                                                         name_hashtable[package_node->name],
1122                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1123                                                         name_hashtable[root_of_alternatives->name]);
1124                                         else
1125                                                 bb_error_msg_and_die(
1126                                                         "package %s %sdepends on %s, which %s\n",
1127                                                         name_hashtable[package_node->name],
1128                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1129                                                         name_hashtable[package_edge->name],
1130                                                         describe_status(status_num));
1131                                 } else if (result == 0 && number_of_alternatives) {
1132                                         /* we've found a package which
1133                                          * satisfies the dependency,
1134                                          * so skip over the rest of
1135                                          * the alternatives.
1136                                          */
1137                                         j += number_of_alternatives;
1138                                         number_of_alternatives = 0;
1139                                 }
1140                         }
1141                 }
1142         }
1143         free(conflicts);
1144         return TRUE;
1145 }
1146
1147 static char **create_list(const char *filename)
1148 {
1149         FILE *list_stream;
1150         char **file_list = NULL;
1151         char *line = NULL;
1152         int count = 0;
1153
1154         /* don't use [xw]fopen here, handle error ourself */
1155         list_stream = fopen(filename, "r");
1156         if (list_stream == NULL) {
1157                 return NULL;
1158         }
1159
1160         while ((line = xmalloc_getline(list_stream)) != NULL) {
1161                 file_list = xrealloc(file_list, sizeof(char *) * (count + 2));
1162                 file_list[count] = line;
1163                 count++;
1164         }
1165         fclose(list_stream);
1166
1167         if (count == 0) {
1168                 return NULL;
1169         } else {
1170                 file_list[count] = NULL;
1171                 return file_list;
1172         }
1173 }
1174
1175 /* maybe i should try and hook this into remove_file.c somehow */
1176 static int remove_file_array(char **remove_names, char **exclude_names)
1177 {
1178         struct stat path_stat;
1179         int match_flag;
1180         int remove_flag = FALSE;
1181         int i,j;
1182
1183         if (remove_names == NULL) {
1184                 return FALSE;
1185         }
1186         for (i = 0; remove_names[i] != NULL; i++) {
1187                 match_flag = FALSE;
1188                 if (exclude_names != NULL) {
1189                         for (j = 0; exclude_names[j] != 0; j++) {
1190                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1191                                         match_flag = TRUE;
1192                                         break;
1193                                 }
1194                         }
1195                 }
1196                 if (!match_flag) {
1197                         if (lstat(remove_names[i], &path_stat) < 0) {
1198                                 continue;
1199                         }
1200                         if (S_ISDIR(path_stat.st_mode)) {
1201                                 if (rmdir(remove_names[i]) != -1) {
1202                                         remove_flag = TRUE;
1203                                 }
1204                         } else {
1205                                 if (unlink(remove_names[i]) != -1) {
1206                                         remove_flag = TRUE;
1207                                 }
1208                         }
1209                 }
1210         }
1211         return remove_flag;
1212 }
1213
1214 static int run_package_script(const char *package_name, const char *script_type)
1215 {
1216         struct stat path_stat;
1217         char *script_path;
1218         int result;
1219
1220         script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1221
1222         /* If the file doesnt exist is isnt a fatal */
1223         result = lstat(script_path, &path_stat) < 0 ? EXIT_SUCCESS : system(script_path);
1224         free(script_path);
1225         return result;
1226 }
1227
1228 static const char *all_control_files[] = {"preinst", "postinst", "prerm", "postrm",
1229         "list", "md5sums", "shlibs", "conffiles", "config", "templates", NULL };
1230
1231 static char **all_control_list(const char *package_name)
1232 {
1233         unsigned i = 0;
1234         char **remove_files;
1235
1236         /* Create a list of all /var/lib/dpkg/info/<package> files */
1237         remove_files = xzalloc(sizeof(all_control_files));
1238         while (all_control_files[i]) {
1239                 remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, all_control_files[i]);
1240                 i++;
1241         }
1242
1243         return remove_files;
1244 }
1245
1246 static void free_array(char **array)
1247 {
1248
1249         if (array) {
1250                 unsigned i = 0;
1251                 while (array[i]) {
1252                         free(array[i]);
1253                         i++;
1254                 }
1255                 free(array);
1256         }
1257 }
1258
1259 /* This function lists information on the installed packages. It loops through
1260  * the status_hashtable to retrieve the info. This results in smaller code than
1261  * scanning the status file. The resulting list, however, is unsorted.
1262  */
1263 static void list_packages(void)
1264 {
1265         int i;
1266
1267         puts("    Name           Version");
1268         puts("+++-==============-==============");
1269
1270         /* go through status hash, dereference package hash and finally strings */
1271         for (i=0; i<STATUS_HASH_PRIME+1; i++) {
1272
1273                 if (status_hashtable[i]) {
1274                         const char *stat_str;  /* status string */
1275                         const char *name_str;  /* package name */
1276                         const char *vers_str;  /* version */
1277                         char  s1, s2;          /* status abbreviations */
1278                         int   spccnt;          /* space count */
1279                         int   j;
1280
1281                         stat_str = name_hashtable[status_hashtable[i]->status];
1282                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1283                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1284
1285                         /* get abbreviation for status field 1 */
1286                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1287
1288                         /* get abbreviation for status field 2 */
1289                         for (j=0, spccnt=0; stat_str[j] && spccnt<2; j++) {
1290                                 if (stat_str[j] == ' ') spccnt++;
1291                         }
1292                         s2 = stat_str[j];
1293
1294                         /* print out the line formatted like Debian dpkg */
1295                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1296                 }
1297     }
1298 }
1299
1300 static void remove_package(const unsigned package_num, int noisy)
1301 {
1302         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1303         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1304         const unsigned status_num = search_status_hashtable(package_name);
1305         const int package_name_length = strlen(package_name);
1306         char **remove_files;
1307         char **exclude_files;
1308         char list_name[package_name_length + 25];
1309         char conffile_name[package_name_length + 30];
1310         int return_value;
1311
1312         if (noisy)
1313                 printf("Removing %s (%s)...\n", package_name, package_version);
1314
1315         /* run prerm script */
1316         return_value = run_package_script(package_name, "prerm");
1317         if (return_value == -1) {
1318                 bb_error_msg_and_die("script failed, prerm failure");
1319         }
1320
1321         /* Create a list of files to remove, and a separate list of those to keep */
1322         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1323         remove_files = create_list(list_name);
1324
1325         sprintf(conffile_name, "/var/lib/dpkg/info/%s.conffiles", package_name);
1326         exclude_files = create_list(conffile_name);
1327
1328         /* Some directories can't be removed straight away, so do multiple passes */
1329         while (remove_file_array(remove_files, exclude_files)) /*repeat */;
1330         free_array(exclude_files);
1331         free_array(remove_files);
1332
1333         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep  */
1334         exclude_files = xzalloc(sizeof(char*) * 3);
1335         exclude_files[0] = xstrdup(conffile_name);
1336         exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.postrm", package_name);
1337
1338         /* Create a list of all /var/lib/dpkg/info/<package> files */
1339         remove_files = all_control_list(package_name);
1340
1341         remove_file_array(remove_files, exclude_files);
1342         free_array(remove_files);
1343         free_array(exclude_files);
1344
1345         /* rename <package>.conffile to <package>.list */
1346         rename(conffile_name, list_name);
1347
1348         /* Change package status */
1349         set_status(status_num, "config-files", 3);
1350 }
1351
1352 static void purge_package(const unsigned package_num)
1353 {
1354         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1355         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1356         const unsigned status_num = search_status_hashtable(package_name);
1357         char **remove_files;
1358         char **exclude_files;
1359         char list_name[strlen(package_name) + 25];
1360
1361         printf("Purging %s (%s)...\n", package_name, package_version);
1362
1363         /* run prerm script */
1364         if (run_package_script(package_name, "prerm") != 0) {
1365                 bb_error_msg_and_die("script failed, prerm failure");
1366         }
1367
1368         /* Create a list of files to remove */
1369         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1370         remove_files = create_list(list_name);
1371
1372         exclude_files = xzalloc(sizeof(char*));
1373
1374         /* Some directories cant be removed straight away, so do multiple passes */
1375         while (remove_file_array(remove_files, exclude_files)) /* repeat */;
1376         free_array(remove_files);
1377
1378         /* Create a list of all /var/lib/dpkg/info/<package> files */
1379         remove_files = all_control_list(package_name);
1380         remove_file_array(remove_files, exclude_files);
1381         free_array(remove_files);
1382         free(exclude_files);
1383
1384         /* run postrm script */
1385         if (run_package_script(package_name, "postrm") == -1) {
1386                 bb_error_msg_and_die("postrm fialure.. set status to what?");
1387         }
1388
1389         /* Change package status */
1390         set_status(status_num, "not-installed", 3);
1391 }
1392
1393 static archive_handle_t *init_archive_deb_ar(const char *filename)
1394 {
1395         archive_handle_t *ar_handle;
1396
1397         /* Setup an ar archive handle that refers to the gzip sub archive */
1398         ar_handle = init_handle();
1399         ar_handle->filter = filter_accept_list_reassign;
1400         ar_handle->src_fd = xopen(filename, O_RDONLY);
1401
1402         return ar_handle;
1403 }
1404
1405 static void init_archive_deb_control(archive_handle_t *ar_handle)
1406 {
1407         archive_handle_t *tar_handle;
1408
1409         /* Setup the tar archive handle */
1410         tar_handle = init_handle();
1411         tar_handle->src_fd = ar_handle->src_fd;
1412
1413         /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1414 #ifdef CONFIG_FEATURE_DEB_TAR_GZ
1415         llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1416 #endif
1417 #ifdef CONFIG_FEATURE_DEB_TAR_BZ2
1418         llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1419 #endif
1420
1421         /* Assign the tar handle as a subarchive of the ar handle */
1422         ar_handle->sub_archive = tar_handle;
1423 }
1424
1425 static void init_archive_deb_data(archive_handle_t *ar_handle)
1426 {
1427         archive_handle_t *tar_handle;
1428
1429         /* Setup the tar archive handle */
1430         tar_handle = init_handle();
1431         tar_handle->src_fd = ar_handle->src_fd;
1432
1433         /* We don't care about control.tar.* or debian-binary, just data.tar.* */
1434 #ifdef CONFIG_FEATURE_DEB_TAR_GZ
1435         llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1436 #endif
1437 #ifdef CONFIG_FEATURE_DEB_TAR_BZ2
1438         llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
1439 #endif
1440
1441         /* Assign the tar handle as a subarchive of the ar handle */
1442         ar_handle->sub_archive = tar_handle;
1443 }
1444
1445 static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1446 {
1447         ar_handle->sub_archive->action_data = data_extract_to_buffer;
1448         ar_handle->sub_archive->accept = myaccept;
1449         ar_handle->sub_archive->filter = filter_accept_list;
1450
1451         unpack_ar_archive(ar_handle);
1452         close(ar_handle->src_fd);
1453
1454         return ar_handle->sub_archive->buffer;
1455 }
1456
1457 static void data_extract_all_prefix(archive_handle_t *archive_handle)
1458 {
1459         char *name_ptr = archive_handle->file_header->name;
1460
1461         name_ptr += strspn(name_ptr, "./");
1462         if (name_ptr[0] != '\0') {
1463                 archive_handle->file_header->name = xasprintf("%s%s", archive_handle->buffer, name_ptr);
1464                 data_extract_all(archive_handle);
1465         }
1466 }
1467
1468 static void unpack_package(deb_file_t *deb_file)
1469 {
1470         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1471         const unsigned status_num = search_status_hashtable(package_name);
1472         const unsigned status_package_num = status_hashtable[status_num]->package;
1473         char *info_prefix;
1474         char *list_filename;
1475         archive_handle_t *archive_handle;
1476         FILE *out_stream;
1477         llist_t *accept_list = NULL;
1478         int i = 0;
1479
1480         /* If existing version, remove it first */
1481         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1482                 /* Package is already installed, remove old version first */
1483                 printf("Preparing to replace %s %s (using %s)...\n", package_name,
1484                         name_hashtable[package_hashtable[status_package_num]->version],
1485                         deb_file->filename);
1486                 remove_package(status_package_num, 0);
1487         } else {
1488                 printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1489         }
1490
1491         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1492         info_prefix = xasprintf("/var/lib/dpkg/info/%s.", package_name);
1493         archive_handle = init_archive_deb_ar(deb_file->filename);
1494         init_archive_deb_control(archive_handle);
1495
1496         while (all_control_files[i]) {
1497                 char *c = xasprintf("./%s", all_control_files[i]);
1498                 llist_add_to(&accept_list, c);
1499                 i++;
1500         }
1501         archive_handle->sub_archive->accept = accept_list;
1502         archive_handle->sub_archive->filter = filter_accept_list;
1503         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1504         archive_handle->sub_archive->buffer = info_prefix;
1505         archive_handle->sub_archive->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
1506         unpack_ar_archive(archive_handle);
1507
1508         /* Run the preinst prior to extracting */
1509         if (run_package_script(package_name, "preinst") != 0) {
1510                 /* when preinst returns exit code != 0 then quit installation process */
1511                 bb_error_msg_and_die("subprocess pre-installation script returned error");
1512         }
1513
1514         /* Extract data.tar.gz to the root directory */
1515         archive_handle = init_archive_deb_ar(deb_file->filename);
1516         init_archive_deb_data(archive_handle);
1517         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1518         archive_handle->sub_archive->buffer = (char*)"/"; /* huh? */
1519         archive_handle->sub_archive->flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
1520         unpack_ar_archive(archive_handle);
1521
1522         /* Create the list file */
1523         list_filename = xasprintf("/var/lib/dpkg/info/%s.list", package_name);
1524         out_stream = xfopen(list_filename, "w");
1525         while (archive_handle->sub_archive->passed) {
1526                 /* the leading . has been stripped by data_extract_all_prefix already */
1527                 fputs(archive_handle->sub_archive->passed->data, out_stream);
1528                 fputc('\n', out_stream);
1529                 archive_handle->sub_archive->passed = archive_handle->sub_archive->passed->link;
1530         }
1531         fclose(out_stream);
1532
1533         /* change status */
1534         set_status(status_num, "install", 1);
1535         set_status(status_num, "unpacked", 3);
1536
1537         free(info_prefix);
1538         free(list_filename);
1539 }
1540
1541 static void configure_package(deb_file_t *deb_file)
1542 {
1543         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1544         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1545         const int status_num = search_status_hashtable(package_name);
1546
1547         printf("Setting up %s (%s)...\n", package_name, package_version);
1548
1549         /* Run the postinst script */
1550         if (run_package_script(package_name, "postinst") != 0) {
1551                 /* TODO: handle failure gracefully */
1552                 bb_error_msg_and_die("postrm failure.. set status to what?");
1553         }
1554         /* Change status to reflect success */
1555         set_status(status_num, "install", 1);
1556         set_status(status_num, "installed", 3);
1557 }
1558
1559 int dpkg_main(int argc, char **argv);
1560 int dpkg_main(int argc, char **argv)
1561 {
1562         deb_file_t **deb_file = NULL;
1563         status_node_t *status_node;
1564         char *str_f;
1565         int opt;
1566         int package_num;
1567         int deb_count = 0;
1568         int state_status;
1569         int status_num;
1570         int i;
1571         enum {
1572                 OPT_configure = 0x1,
1573                 OPT_force_ignore_depends = 0x2,
1574                 OPT_install = 0x4,
1575                 OPT_list_installed = 0x8,
1576                 OPT_purge = 0x10,
1577                 OPT_remove = 0x20,
1578                 OPT_unpack = 0x40,
1579         };
1580
1581         opt = getopt32(argc, argv, "CF:ilPru", &str_f);
1582         //if (opt & OPT_configure) ... // -C
1583         if (opt & OPT_force_ignore_depends) { // -F (--force in official dpkg)
1584                 if (strcmp(str_f, "depends"))
1585                         opt &= ~OPT_force_ignore_depends;
1586         }
1587         //if (opt & OPT_install) ... // -i
1588         //if (opt & OPT_list_installed) ... // -l
1589         //if (opt & OPT_purge) ... // -P
1590         //if (opt & OPT_remove) ... // -r
1591         //if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1592         argc -= optind;
1593         argv += optind;
1594         /* check for non-option argument if expected  */
1595         if (!opt || (!argc && !(opt && OPT_list_installed)))
1596                 bb_show_usage();
1597
1598         name_hashtable = xzalloc(sizeof(name_hashtable[0]) * (NAME_HASH_PRIME + 1));
1599         package_hashtable = xzalloc(sizeof(package_hashtable[0]) * (PACKAGE_HASH_PRIME + 1));
1600         status_hashtable = xzalloc(sizeof(status_hashtable[0]) * (STATUS_HASH_PRIME + 1));
1601
1602 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1603         index_status_file("/var/lib/dpkg/status");
1604
1605         /* if the list action was given print the installed packages and exit */
1606         if (opt & OPT_list_installed) {
1607                 list_packages();
1608                 return EXIT_SUCCESS;
1609         }
1610
1611         /* Read arguments and store relevant info in structs */
1612         while (*argv) {
1613                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1614                 deb_file = xrealloc(deb_file, sizeof(deb_file[0]) * (deb_count + 2));
1615                 deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1616                 if (opt & (OPT_install | OPT_unpack)) {
1617                         /* -i/-u: require filename */
1618                         archive_handle_t *archive_handle;
1619                         llist_t *control_list = NULL;
1620
1621                         /* Extract the control file */
1622                         llist_add_to(&control_list, (char*)"./control");
1623                         archive_handle = init_archive_deb_ar(argv[0]);
1624                         init_archive_deb_control(archive_handle);
1625                         deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1626                         if (deb_file[deb_count]->control_file == NULL) {
1627                                 bb_error_msg_and_die("cannot extract control file");
1628                         }
1629                         deb_file[deb_count]->filename = xstrdup(argv[0]);
1630                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1631
1632                         if (package_num == -1) {
1633                                 bb_error_msg("invalid control file in %s", argv[0]);
1634                                 argv++;
1635                                 continue;
1636                         }
1637                         deb_file[deb_count]->package = (unsigned) package_num;
1638
1639                         /* Add the package to the status hashtable */
1640                         if (opt & (OPT_unpack | OPT_install)) {
1641                                 /* Try and find a currently installed version of this package */
1642                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1643                                 /* If no previous entry was found initialise a new entry */
1644                                 if (status_hashtable[status_num] == NULL
1645                                  || status_hashtable[status_num]->status == 0
1646                                 ) {
1647                                         status_node = xmalloc(sizeof(status_node_t));
1648                                         status_node->package = deb_file[deb_count]->package;
1649                                         /* reinstreq isnt changed to "ok" until the package control info
1650                                          * is written to the status file*/
1651                                         status_node->status = search_name_hashtable("install reinstreq not-installed");
1652                                         status_hashtable[status_num] = status_node;
1653                                 } else {
1654                                         set_status(status_num, "install", 1);
1655                                         set_status(status_num, "reinstreq", 2);
1656                                 }
1657                         }
1658                 } else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1659                         /* -C/-p/-r: require package name */
1660                         deb_file[deb_count]->package = search_package_hashtable(
1661                                         search_name_hashtable(argv[0]),
1662                                         search_name_hashtable("ANY"), VER_ANY);
1663                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1664                                 bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1665                         }
1666                         package_num = deb_file[deb_count]->package;
1667                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1668                         state_status = get_status(status_num, 3);
1669
1670                         /* check package status is "installed" */
1671                         if (opt & OPT_remove) {
1672                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0
1673                                  || strcmp(name_hashtable[state_status], "config-files") == 0
1674                                 ) {
1675                                         bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1676                                 }
1677                                 set_status(status_num, "deinstall", 1);
1678                         } else if (opt & OPT_purge) {
1679                                 /* if package status is "conf-files" then its ok */
1680                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1681                                         bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1682                                 }
1683                                 set_status(status_num, "purge", 1);
1684                         }
1685                 }
1686                 deb_count++;
1687                 argv++;
1688         }
1689         if (!deb_count)
1690                 bb_error_msg_and_die("no package files specified");
1691         deb_file[deb_count] = NULL;
1692
1693         /* Check that the deb file arguments are installable */
1694         if (!(opt & OPT_force_ignore_depends)) {
1695                 if (!check_deps(deb_file, 0, deb_count)) {
1696                         bb_error_msg_and_die("dependency check failed");
1697                 }
1698         }
1699
1700         /* TODO: install or remove packages in the correct dependency order */
1701         for (i = 0; i < deb_count; i++) {
1702                 /* Remove or purge packages */
1703                 if (opt & OPT_remove) {
1704                         remove_package(deb_file[i]->package, 1);
1705                 }
1706                 else if (opt & OPT_purge) {
1707                         purge_package(deb_file[i]->package);
1708                 }
1709                 else if (opt & OPT_unpack) {
1710                         unpack_package(deb_file[i]);
1711                 }
1712                 else if (opt & OPT_install) {
1713                         unpack_package(deb_file[i]);
1714                         /* package is configured in second pass below */
1715                 }
1716                 else if (opt & OPT_configure) {
1717                         configure_package(deb_file[i]);
1718                 }
1719         }
1720         /* configure installed packages */
1721         if (opt & OPT_install) {
1722                 for (i = 0; i < deb_count; i++)
1723                         configure_package(deb_file[i]);
1724         }
1725
1726         write_status_file(deb_file);
1727
1728         if (ENABLE_FEATURE_CLEAN_UP) {
1729                 for (i = 0; i < deb_count; i++) {
1730                         free(deb_file[i]->control_file);
1731                         free(deb_file[i]->filename);
1732                         free(deb_file[i]);
1733                 }
1734
1735                 free(deb_file);
1736
1737                 for (i = 0; i < NAME_HASH_PRIME; i++) {
1738                         free(name_hashtable[i]);
1739                 }
1740
1741                 for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1742                         if (package_hashtable[i] != NULL) {
1743                                 free_package(package_hashtable[i]);
1744                         }
1745                 }
1746
1747                 for (i = 0; i < STATUS_HASH_PRIME; i++) {
1748                         free(status_hashtable[i]);
1749                 }
1750
1751                 free(status_hashtable);
1752                 free(package_hashtable);
1753                 free(name_hashtable);
1754         }
1755
1756         return EXIT_SUCCESS;
1757 }