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 "libbb.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:4; /* was:3 */
  57         unsigned type:4;
  58         unsigned name:16; /* was:14 */
  59         unsigned version:16; /* was:14 */
  60 } edge_t;
  61
  62 typedef struct common_node_s {
  63         unsigned name:16; /* was:14 */
  64         unsigned version:16; /* was:14 */
  65         unsigned num_of_edges:16; /* was: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:16; /* was:14 */       /* has to fit PACKAGE_HASH_PRIME */
  75         unsigned status:16; /* was:14 */        /* has to fit STATUS_HASH_PRIME */
  76 } status_node_t;
  77
  78
  79 /* Globals */
  80 struct globals {
  81         char          *name_hashtable[NAME_HASH_PRIME + 1];
  82         common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
  83         status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
  84 };
  85 #define G (*ptr_to_globals)
  86 #define name_hashtable    (G.name_hashtable   )
  87 #define package_hashtable (G.package_hashtable)
  88 #define status_hashtable  (G.status_hashtable )
  89 #define INIT_G() do { \
  90         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
  91 } while (0)
  92
  93
  94 /* Even numbers are for 'extras', like ored dependencies or null */
  95 enum edge_type_e {
  96         EDGE_NULL = 0,
  97         EDGE_PRE_DEPENDS = 1,
  98         EDGE_OR_PRE_DEPENDS = 2,
  99         EDGE_DEPENDS = 3,
 100         EDGE_OR_DEPENDS = 4,
 101         EDGE_REPLACES = 5,
 102         EDGE_PROVIDES = 7,
 103         EDGE_CONFLICTS = 9,
 104         EDGE_SUGGESTS = 11,
 105         EDGE_RECOMMENDS = 13,
 106         EDGE_ENHANCES = 15
 107 };
 108 enum operator_e {
 109         VER_NULL = 0,
 110         VER_EQUAL = 1,
 111         VER_LESS = 2,
 112         VER_LESS_EQUAL = 3,
 113         VER_MORE = 4,
 114         VER_MORE_EQUAL = 5,
 115         VER_ANY = 6
 116 };
 117
 118 typedef struct deb_file_s {
 119         char *control_file;
 120         char *filename;
 121         unsigned package:16; /* was:14 */
 122 } deb_file_t;
 123
 124
 125 static void make_hash(const char *key, unsigned *start, unsigned *decrement, const int hash_prime)
 126 {
 127         unsigned long hash_num = key[0];
 128         int len = strlen(key);
 129         int i;
 130
 131         /* Maybe i should have uses a "proper" hashing algorithm here instead
 132          * of making one up myself, seems to be working ok though. */
 133         for (i = 1; i < len; i++) {
 134                 /* shifts the ascii based value and adds it to previous value
 135                  * shift amount is mod 24 because long int is 32 bit and data
 136                  * to be shifted is 8, don't want to shift data to where it has
 137                  * no effect*/
 138                 hash_num += (key[i] + key[i-1]) << ((key[i] * i) % 24);
 139         }
 140         *start = (unsigned) hash_num % hash_prime;
 141         *decrement = (unsigned) 1 + (hash_num % (hash_prime - 1));
 142 }
 143
 144 /* this adds the key to the hash table */
 145 static int search_name_hashtable(const char *key)
 146 {
 147         unsigned probe_address;
 148         unsigned probe_decrement;
 149
 150         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 151         while (name_hashtable[probe_address] != NULL) {
 152                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 153                         return probe_address;
 154                 }
 155                 probe_address -= probe_decrement;
 156                 if ((int)probe_address < 0) {
 157                         probe_address += NAME_HASH_PRIME;
 158                 }
 159         }
 160         name_hashtable[probe_address] = xstrdup(key);
 161         return probe_address;
 162 }
 163
 164 /* this DOESNT add the key to the hashtable
 165  * TODO make it consistent with search_name_hashtable
 166  */
 167 static unsigned search_status_hashtable(const char *key)
 168 {
 169         unsigned probe_address;
 170         unsigned probe_decrement;
 171
 172         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 173         while (status_hashtable[probe_address] != NULL) {
 174                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 175                         break;
 176                 }
 177                 probe_address -= probe_decrement;
 178                 if ((int)probe_address < 0) {
 179                         probe_address += STATUS_HASH_PRIME;
 180                 }
 181         }
 182         return probe_address;
 183 }
 184
 185 /* Need to rethink version comparison, maybe the official dpkg has something i can use ? */
 186 static int version_compare_part(const char *version1, const char *version2)
 187 {
 188         int upstream_len1 = 0;
 189         int upstream_len2 = 0;
 190         char *name1_char;
 191         char *name2_char;
 192         int len1 = 0;
 193         int len2 = 0;
 194         int tmp_int;
 195         int ver_num1;
 196         int ver_num2;
 197
 198         if (version1 == NULL) {
 199                 version1 = xstrdup("");
 200         }
 201         if (version2 == NULL) {
 202                 version2 = xstrdup("");
 203         }
 204         upstream_len1 = strlen(version1);
 205         upstream_len2 = strlen(version2);
 206
 207         while ((len1 < upstream_len1) || (len2 < upstream_len2)) {
 208                 /* Compare non-digit section */
 209                 tmp_int = strcspn(&version1[len1], "0123456789");
 210                 name1_char = xstrndup(&version1[len1], tmp_int);
 211                 len1 += tmp_int;
 212                 tmp_int = strcspn(&version2[len2], "0123456789");
 213                 name2_char = xstrndup(&version2[len2], tmp_int);
 214                 len2 += tmp_int;
 215                 tmp_int = strcmp(name1_char, name2_char);
 216                 free(name1_char);
 217                 free(name2_char);
 218                 if (tmp_int != 0) {
 219                         return tmp_int;
 220                 }
 221
 222                 /* Compare digits */
 223                 tmp_int = strspn(&version1[len1], "0123456789");
 224                 name1_char = xstrndup(&version1[len1], tmp_int);
 225                 len1 += tmp_int;
 226                 tmp_int = strspn(&version2[len2], "0123456789");
 227                 name2_char = xstrndup(&version2[len2], tmp_int);
 228                 len2 += tmp_int;
 229                 ver_num1 = atoi(name1_char);
 230                 ver_num2 = atoi(name2_char);
 231                 free(name1_char);
 232                 free(name2_char);
 233                 if (ver_num1 < ver_num2) {
 234                         return -1;
 235                 }
 236                 if (ver_num1 > ver_num2) {
 237                         return 1;
 238                 }
 239         }
 240         return 0;
 241 }
 242
 243 /* if ver1 < ver2 return -1,
 244  * if ver1 = ver2 return 0,
 245  * if ver1 > ver2 return 1,
 246  */
 247 static int version_compare(const unsigned ver1, const unsigned ver2)
 248 {
 249         char *ch_ver1 = name_hashtable[ver1];
 250         char *ch_ver2 = name_hashtable[ver2];
 251
 252         char epoch1, epoch2;
 253         char *deb_ver1, *deb_ver2;
 254         char *ver1_ptr, *ver2_ptr;
 255         char *upstream_ver1;
 256         char *upstream_ver2;
 257         int result;
 258
 259         /* Compare epoch */
 260         if (ch_ver1[1] == ':') {
 261                 epoch1 = ch_ver1[0];
 262                 ver1_ptr = strchr(ch_ver1, ':') + 1;
 263         } else {
 264                 epoch1 = '0';
 265                 ver1_ptr = ch_ver1;
 266         }
 267         if (ch_ver2[1] == ':') {
 268                 epoch2 = ch_ver2[0];
 269                 ver2_ptr = strchr(ch_ver2, ':') + 1;
 270         } else {
 271                 epoch2 = '0';
 272                 ver2_ptr = ch_ver2;
 273         }
 274         if (epoch1 < epoch2) {
 275                 return -1;
 276         }
 277         else if (epoch1 > epoch2) {
 278                 return 1;
 279         }
 280
 281         /* Compare upstream version */
 282         upstream_ver1 = xstrdup(ver1_ptr);
 283         upstream_ver2 = xstrdup(ver2_ptr);
 284
 285         /* Chop off debian version, and store for later use */
 286         deb_ver1 = strrchr(upstream_ver1, '-');
 287         deb_ver2 = strrchr(upstream_ver2, '-');
 288         if (deb_ver1) {
 289                 deb_ver1[0] = '\0';
 290                 deb_ver1++;
 291         }
 292         if (deb_ver2) {
 293                 deb_ver2[0] = '\0';
 294                 deb_ver2++;
 295         }
 296         result = version_compare_part(upstream_ver1, upstream_ver2);
 297         if (!result)
 298                 /* Compare debian versions */
 299                 result = version_compare_part(deb_ver1, deb_ver2);
 300
 301         free(upstream_ver1);
 302         free(upstream_ver2);
 303         return result;
 304 }
 305
 306 static int test_version(const unsigned version1, const unsigned version2, const unsigned operator)
 307 {
 308         const int version_result = version_compare(version1, version2);
 309         switch (operator) {
 310         case VER_ANY:
 311                 return TRUE;
 312         case VER_EQUAL:
 313                 return (version_result == 0);
 314         case VER_LESS:
 315                 return (version_result < 0);
 316         case VER_LESS_EQUAL:
 317                 return (version_result <= 0);
 318         case VER_MORE:
 319                 return (version_result > 0);
 320         case VER_MORE_EQUAL:
 321                 return (version_result >= 0);
 322         }
 323         return FALSE;
 324 }
 325
 326 static int search_package_hashtable(const unsigned name, const unsigned version, const unsigned operator)
 327 {
 328         unsigned probe_address;
 329         unsigned probe_decrement;
 330
 331         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 332         while (package_hashtable[probe_address] != NULL) {
 333                 if (package_hashtable[probe_address]->name == name) {
 334                         if (operator == VER_ANY) {
 335                                 return probe_address;
 336                         }
 337                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 338                                 return probe_address;
 339                         }
 340                 }
 341                 probe_address -= probe_decrement;
 342                 if ((int)probe_address < 0) {
 343                         probe_address += PACKAGE_HASH_PRIME;
 344                 }
 345         }
 346         return probe_address;
 347 }
 348
 349 /*
 350  * This function searches through the entire package_hashtable looking
 351  * for a package which provides "needle". It returns the index into
 352  * the package_hashtable for the providing package.
 353  *
 354  * needle is the index into name_hashtable of the package we are
 355  * looking for.
 356  *
 357  * start_at is the index in the package_hashtable to start looking
 358  * at. If start_at is -1 then start at the beginning. This is to allow
 359  * for repeated searches since more than one package might provide
 360  * needle.
 361  *
 362  * FIXME: I don't think this is very efficient, but I thought I'd keep
 363  * it simple for now until it proves to be a problem.
 364  */
 365 static int search_for_provides(int needle, int start_at)
 366 {
 367         int i, j;
 368         common_node_t *p;
 369         for (i = start_at + 1; i < PACKAGE_HASH_PRIME; i++) {
 370                 p = package_hashtable[i];
 371                 if (p == NULL)
 372                         continue;
 373                 for (j = 0; j < p->num_of_edges; j++)
 374                         if (p->edge[j]->type == EDGE_PROVIDES && p->edge[j]->name == needle)
 375                                 return i;
 376         }
 377         return -1;
 378 }
 379
 380 /*
 381  * Add an edge to a node
 382  */
 383 static void add_edge_to_node(common_node_t *node, edge_t *edge)
 384 {
 385         node->edge = xrealloc_vector(node->edge, 2, node->num_of_edges);
 386         node->edge[node->num_of_edges++] = edge;
 387 }
 388
 389 /*
 390  * Create one new node and one new edge for every dependency.
 391  *
 392  * Dependencies which contain multiple alternatives are represented as
 393  * an EDGE_OR_PRE_DEPENDS or EDGE_OR_DEPENDS node, followed by a
 394  * number of EDGE_PRE_DEPENDS or EDGE_DEPENDS nodes. The name field of
 395  * the OR edge contains the full dependency string while the version
 396  * field contains the number of EDGE nodes which follow as part of
 397  * this alternative.
 398  */
 399 static void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned edge_type)
 400 {
 401         char *line = xstrdup(whole_line);
 402         char *line2;
 403         char *line_ptr1 = NULL;
 404         char *line_ptr2 = NULL;
 405         char *field;
 406         char *field2;
 407         char *version;
 408         edge_t *edge;
 409         edge_t *or_edge;
 410         int offset_ch;
 411
 412         field = strtok_r(line, ",", &line_ptr1);
 413         do {
 414                 /* skip leading spaces */
 415                 field += strspn(field, " ");
 416                 line2 = xstrdup(field);
 417                 field2 = strtok_r(line2, "|", &line_ptr2);
 418                 or_edge = NULL;
 419                 if ((edge_type == EDGE_DEPENDS || edge_type == EDGE_PRE_DEPENDS)
 420                  && (strcmp(field, field2) != 0)
 421                 ) {
 422                         or_edge = xzalloc(sizeof(edge_t));
 423                         or_edge->type = edge_type + 1;
 424                         or_edge->name = search_name_hashtable(field);
 425                         //or_edge->version = 0; // tracks the number of alternatives
 426                         add_edge_to_node(parent_node, or_edge);
 427                 }
 428
 429                 do {
 430                         edge = xmalloc(sizeof(edge_t));
 431                         edge->type = edge_type;
 432
 433                         /* Skip any extra leading spaces */
 434                         field2 += strspn(field2, " ");
 435
 436                         /* Get dependency version info */
 437                         version = strchr(field2, '(');
 438                         if (version == NULL) {
 439                                 edge->operator = VER_ANY;
 440                                 /* Get the versions hash number, adding it if the number isnt already in there */
 441                                 edge->version = search_name_hashtable("ANY");
 442                         } else {
 443                                 /* Skip leading ' ' or '(' */
 444                                 version += strspn(version, " (");
 445                                 /* Calculate length of any operator characters */
 446                                 offset_ch = strspn(version, "<=>");
 447                                 /* Determine operator */
 448                                 if (offset_ch > 0) {
 449                                         if (strncmp(version, "=", offset_ch) == 0) {
 450                                                 edge->operator = VER_EQUAL;
 451                                         } else if (strncmp(version, "<<", offset_ch) == 0) {
 452                                                 edge->operator = VER_LESS;
 453                                         } else if (strncmp(version, "<=", offset_ch) == 0) {
 454                                                 edge->operator = VER_LESS_EQUAL;
 455                                         } else if (strncmp(version, ">>", offset_ch) == 0) {
 456                                                 edge->operator = VER_MORE;
 457                                         } else if (strncmp(version, ">=", offset_ch) == 0) {
 458                                                 edge->operator = VER_MORE_EQUAL;
 459                                         } else {
 460                                                 bb_error_msg_and_die("illegal operator");
 461                                         }
 462                                 }
 463                                 /* skip to start of version numbers */
 464                                 version += offset_ch;
 465                                 version += strspn(version, " ");
 466
 467                                 /* Truncate version at trailing ' ' or ')' */
 468                                 version[strcspn(version, " )")] = '\0';
 469                                 /* Get the versions hash number, adding it if the number isnt already in there */
 470                                 edge->version = search_name_hashtable(version);
 471                         }
 472
 473                         /* Get the dependency name */
 474                         field2[strcspn(field2, " (")] = '\0';
 475                         edge->name = search_name_hashtable(field2);
 476
 477                         if (or_edge)
 478                                 or_edge->version++;
 479
 480                         add_edge_to_node(parent_node, edge);
 481                         field2 = strtok_r(NULL, "|", &line_ptr2);
 482                 } while (field2 != NULL);
 483
 484                 free(line2);
 485                 field = strtok_r(NULL, ",", &line_ptr1);
 486         } while (field != NULL);
 487
 488         free(line);
 489 }
 490
 491 static void free_package(common_node_t *node)
 492 {
 493         unsigned i;
 494         if (node) {
 495                 for (i = 0; i < node->num_of_edges; i++) {
 496                         free(node->edge[i]);
 497                 }
 498                 free(node->edge);
 499                 free(node);
 500         }
 501 }
 502
 503 /*
 504  * Gets the next package field from package_buffer, seperated into the field name
 505  * and field value, it returns the int offset to the first character of the next field
 506  */
 507 static int read_package_field(const char *package_buffer, char **field_name, char **field_value)
 508 {
 509         int offset_name_start = 0;
 510         int offset_name_end = 0;
 511         int offset_value_start = 0;
 512         int offset_value_end = 0;
 513         int offset = 0;
 514         int next_offset;
 515         int name_length;
 516         int value_length;
 517         int exit_flag = FALSE;
 518
 519         if (package_buffer == NULL) {
 520                 *field_name = NULL;
 521                 *field_value = NULL;
 522                 return -1;
 523         }
 524         while (1) {
 525                 next_offset = offset + 1;
 526                 switch (package_buffer[offset]) {
 527                         case '\0':
 528                                 exit_flag = TRUE;
 529                                 break;
 530                         case ':':
 531                                 if (offset_name_end == 0) {
 532                                         offset_name_end = offset;
 533                                         offset_value_start = next_offset;
 534                                 }
 535                                 /* TODO: Name might still have trailing spaces if ':' isnt
 536                                  * immediately after name */
 537                                 break;
 538                         case '\n':
 539                                 /* TODO: The char next_offset may be out of bounds */
 540                                 if (package_buffer[next_offset] != ' ') {
 541                                         exit_flag = TRUE;
 542                                         break;
 543                                 }
 544                         case '\t':
 545                         case ' ':
 546                                 /* increment the value start point if its a just filler */
 547                                 if (offset_name_start == offset) {
 548                                         offset_name_start++;
 549                                 }
 550                                 if (offset_value_start == offset) {
 551                                         offset_value_start++;
 552                                 }
 553                                 break;
 554                 }
 555                 if (exit_flag) {
 556                         /* Check that the names are valid */
 557                         offset_value_end = offset;
 558                         name_length = offset_name_end - offset_name_start;
 559                         value_length = offset_value_end - offset_value_start;
 560                         if (name_length == 0) {
 561                                 break;
 562                         }
 563                         if ((name_length > 0) && (value_length > 0)) {
 564                                 break;
 565                         }
 566
 567                         /* If not valid, start fresh with next field */
 568                         exit_flag = FALSE;
 569                         offset_name_start = offset + 1;
 570                         offset_name_end = 0;
 571                         offset_value_start = offset + 1;
 572                         offset_value_end = offset + 1;
 573                         offset++;
 574                 }
 575                 offset++;
 576         }
 577         *field_name = NULL;
 578         if (name_length) {
 579                 *field_name = xstrndup(&package_buffer[offset_name_start], name_length);
 580         }
 581         *field_value = NULL;
 582         if (value_length > 0) {
 583                 *field_value = xstrndup(&package_buffer[offset_value_start], value_length);
 584         }
 585         return next_offset;
 586 }
 587
 588 static unsigned fill_package_struct(char *control_buffer)
 589 {
 590         static const char field_names[] ALIGN1 =
 591                 "Package\0""Version\0"
 592                 "Pre-Depends\0""Depends\0""Replaces\0""Provides\0"
 593                 "Conflicts\0""Suggests\0""Recommends\0""Enhances\0";
 594
 595         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 596         char *field_name;
 597         char *field_value;
 598         int field_start = 0;
 599         int num = -1;
 600         int buffer_length = strlen(control_buffer);
 601
 602         new_node->version = search_name_hashtable("unknown");
 603         while (field_start < buffer_length) {
 604                 unsigned field_num;
 605
 606                 field_start += read_package_field(&control_buffer[field_start],
 607                                 &field_name, &field_value);
 608
 609                 if (field_name == NULL) {
 610                         goto fill_package_struct_cleanup;
 611                 }
 612
 613                 field_num = index_in_strings(field_names, field_name);
 614                 switch (field_num) {
 615                 case 0: /* Package */
 616                         new_node->name = search_name_hashtable(field_value);
 617                         break;
 618                 case 1: /* Version */
 619                         new_node->version = search_name_hashtable(field_value);
 620                         break;
 621                 case 2: /* Pre-Depends */
 622                         add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 623                         break;
 624                 case 3: /* Depends */
 625                         add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 626                         break;
 627                 case 4: /* Replaces */
 628                         add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 629                         break;
 630                 case 5: /* Provides */
 631                         add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 632                         break;
 633                 case 6: /* Conflicts */
 634                         add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 635                         break;
 636                 case 7: /* Suggests */
 637                         add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 638                         break;
 639                 case 8: /* Recommends */
 640                         add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 641                         break;
 642                 case 9: /* Enhances */
 643                         add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 644                         break;
 645                 }
 646  fill_package_struct_cleanup:
 647                 free(field_name);
 648                 free(field_value);
 649         }
 650
 651         if (new_node->version == search_name_hashtable("unknown")) {
 652                 free_package(new_node);
 653                 return -1;
 654         }
 655         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 656         free_package(package_hashtable[num]);
 657         package_hashtable[num] = new_node;
 658         return num;
 659 }
 660
 661 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
 662 static unsigned get_status(const unsigned status_node, const int num)
 663 {
 664         char *status_string = name_hashtable[status_hashtable[status_node]->status];
 665         char *state_sub_string;
 666         unsigned state_sub_num;
 667         int len;
 668         int i;
 669
 670         /* set tmp_string to point to the start of the word number */
 671         for (i = 1; i < num; i++) {
 672                 /* skip past a word */
 673                 status_string += strcspn(status_string, " ");
 674                 /* skip past the separating spaces */
 675                 status_string += strspn(status_string, " ");
 676         }
 677         len = strcspn(status_string, " \n");
 678         state_sub_string = xstrndup(status_string, len);
 679         state_sub_num = search_name_hashtable(state_sub_string);
 680         free(state_sub_string);
 681         return state_sub_num;
 682 }
 683
 684 static void set_status(const unsigned status_node_num, const char *new_value, const int position)
 685 {
 686         const unsigned new_value_len = strlen(new_value);
 687         const unsigned new_value_num = search_name_hashtable(new_value);
 688         unsigned want = get_status(status_node_num, 1);
 689         unsigned flag = get_status(status_node_num, 2);
 690         unsigned status = get_status(status_node_num, 3);
 691         int want_len = strlen(name_hashtable[want]);
 692         int flag_len = strlen(name_hashtable[flag]);
 693         int status_len = strlen(name_hashtable[status]);
 694         char *new_status;
 695
 696         switch (position) {
 697                 case 1:
 698                         want = new_value_num;
 699                         want_len = new_value_len;
 700                         break;
 701                 case 2:
 702                         flag = new_value_num;
 703                         flag_len = new_value_len;
 704                         break;
 705                 case 3:
 706                         status = new_value_num;
 707                         status_len = new_value_len;
 708                         break;
 709                 default:
 710                         bb_error_msg_and_die("DEBUG ONLY: this shouldnt happen");
 711         }
 712
 713         new_status = xasprintf("%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
 714         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
 715         free(new_status);
 716 }
 717
 718 static const char *describe_status(int status_num)
 719 {
 720         int status_want, status_state;
 721         if (status_hashtable[status_num] == NULL || status_hashtable[status_num]->status == 0)
 722                 return "is not installed or flagged to be installed";
 723
 724         status_want = get_status(status_num, 1);
 725         status_state = get_status(status_num, 3);
 726
 727         if (status_state == search_name_hashtable("installed")) {
 728                 if (status_want == search_name_hashtable("install"))
 729                         return "is installed";
 730                 if (status_want == search_name_hashtable("deinstall"))
 731                         return "is marked to be removed";
 732                 if (status_want == search_name_hashtable("purge"))
 733                         return "is marked to be purged";
 734         }
 735         if (status_want == search_name_hashtable("unknown"))
 736                 return "is in an indeterminate state";
 737         if (status_want == search_name_hashtable("install"))
 738                 return "is marked to be installed";
 739
 740         return "is not installed or flagged to be installed";
 741 }
 742
 743 static void index_status_file(const char *filename)
 744 {
 745         FILE *status_file;
 746         char *control_buffer;
 747         char *status_line;
 748         status_node_t *status_node = NULL;
 749         unsigned status_num;
 750
 751         status_file = xfopen_for_read(filename);
 752         while ((control_buffer = xmalloc_fgetline_str(status_file, "\n\n")) != NULL) {
 753                 const unsigned package_num = fill_package_struct(control_buffer);
 754                 if (package_num != -1) {
 755                         status_node = xmalloc(sizeof(status_node_t));
 756                         /* fill_package_struct doesnt handle the status field */
 757                         status_line = strstr(control_buffer, "Status:");
 758                         if (status_line != NULL) {
 759                                 status_line += 7;
 760                                 status_line += strspn(status_line, " \n\t");
 761                                 status_line = xstrndup(status_line, strcspn(status_line, "\n"));
 762                                 status_node->status = search_name_hashtable(status_line);
 763                                 free(status_line);
 764                         }
 765                         status_node->package = package_num;
 766                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
 767                         status_hashtable[status_num] = status_node;
 768                 }
 769                 free(control_buffer);
 770         }
 771         fclose(status_file);
 772 }
 773
 774 static void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
 775 {
 776         char *name;
 777         char *value;
 778         int start = 0;
 779         while (1) {
 780                 start += read_package_field(&control_buffer[start], &name, &value);
 781                 if (name == NULL) {
 782                         break;
 783                 }
 784                 if (strcmp(name, "Status") != 0) {
 785                         fprintf(new_status_file, "%s: %s\n", name, value);
 786                 }
 787         }
 788 }
 789
 790 /* This could do with a cleanup */
 791 static void write_status_file(deb_file_t **deb_file)
 792 {
 793         FILE *old_status_file = xfopen_for_read("/var/lib/dpkg/status");
 794         FILE *new_status_file = xfopen_for_write("/var/lib/dpkg/status.udeb");
 795         char *package_name;
 796         char *status_from_file;
 797         char *control_buffer = NULL;
 798         char *tmp_string;
 799         int status_num;
 800         int field_start = 0;
 801         int write_flag;
 802         int i = 0;
 803
 804         /* Update previously known packages */
 805         while ((control_buffer = xmalloc_fgetline_str(old_status_file, "\n\n")) != NULL) {
 806                 tmp_string = strstr(control_buffer, "Package:");
 807                 if (tmp_string == NULL) {
 808                         continue;
 809                 }
 810
 811                 tmp_string += 8;
 812                 tmp_string += strspn(tmp_string, " \n\t");
 813                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 814                 write_flag = FALSE;
 815                 tmp_string = strstr(control_buffer, "Status:");
 816                 if (tmp_string != NULL) {
 817                         /* Seperate the status value from the control buffer */
 818                         tmp_string += 7;
 819                         tmp_string += strspn(tmp_string, " \n\t");
 820                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 821                 } else {
 822                         status_from_file = NULL;
 823                 }
 824
 825                 /* Find this package in the status hashtable */
 826                 status_num = search_status_hashtable(package_name);
 827                 if (status_hashtable[status_num] != NULL) {
 828                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 829                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 830                                 /* New status isnt exactly the same as old status */
 831                                 const int state_status = get_status(status_num, 3);
 832                                 if ((strcmp("installed", name_hashtable[state_status]) == 0)
 833                                  || (strcmp("unpacked", name_hashtable[state_status]) == 0)
 834                                 ) {
 835                                         /* We need to add the control file from the package */
 836                                         i = 0;
 837                                         while (deb_file[i] != NULL) {
 838                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 839                                                         /* Write a status file entry with a modified status */
 840                                                         /* remove trailing \n's */
 841                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 842                                                         set_status(status_num, "ok", 2);
 843                                                         fprintf(new_status_file, "Status: %s\n\n",
 844                                                                         name_hashtable[status_hashtable[status_num]->status]);
 845                                                         write_flag = TRUE;
 846                                                         break;
 847                                                 }
 848                                                 i++;
 849                                         }
 850                                         /* This is temperary, debugging only */
 851                                         if (deb_file[i] == NULL) {
 852                                                 bb_error_msg_and_die("ALERT: cannot find a control file, "
 853                                                         "your status file may be broken, status may be "
 854                                                         "incorrect for %s", package_name);
 855                                         }
 856                                 }
 857                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 858                                         /* Only write the Package, Status, Priority and Section lines */
 859                                         fprintf(new_status_file, "Package: %s\n", package_name);
 860                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 861
 862                                         while (1) {
 863                                                 char *field_name;
 864                                                 char *field_value;
 865                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 866                                                 if (field_name == NULL) {
 867                                                         break;
 868                                                 }
 869                                                 if ((strcmp(field_name, "Priority") == 0) ||
 870                                                         (strcmp(field_name, "Section") == 0)) {
 871                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 872                                                 }
 873                                         }
 874                                         write_flag = TRUE;
 875                                         fputs("\n", new_status_file);
 876                                 }
 877                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 878                                         /* only change the status line */
 879                                         while (1) {
 880                                                 char *field_name;
 881                                                 char *field_value;
 882                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 883                                                 if (field_name == NULL) {
 884                                                         break;
 885                                                 }
 886                                                 /* Setup start point for next field */
 887                                                 if (strcmp(field_name, "Status") == 0) {
 888                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 889                                                 } else {
 890                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 891                                                 }
 892                                         }
 893                                         write_flag = TRUE;
 894                                         fputs("\n", new_status_file);
 895                                 }
 896                         }
 897                 }
 898                 /* If the package from the status file wasnt handle above, do it now*/
 899                 if (!write_flag) {
 900                         fprintf(new_status_file, "%s\n\n", control_buffer);
 901                 }
 902
 903                 free(status_from_file);
 904                 free(package_name);
 905                 free(control_buffer);
 906         }
 907
 908         /* Write any new packages */
 909         for (i = 0; deb_file[i] != NULL; i++) {
 910                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 911                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 912                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 913                         set_status(status_num, "ok", 2);
 914                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 915                 }
 916         }
 917         fclose(old_status_file);
 918         fclose(new_status_file);
 919
 920         /* Create a separate backfile to dpkg */
 921         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 922                 if (errno != ENOENT)
 923                         bb_error_msg_and_die("cannot create backup status file");
 924                 /* Its ok if renaming the status file fails because status
 925                  * file doesnt exist, maybe we are starting from scratch */
 926                 bb_error_msg("no status file found, creating new one");
 927         }
 928
 929         xrename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status");
 930 }
 931
 932 /* This function returns TRUE if the given package can satisfy a
 933  * dependency of type depend_type.
 934  *
 935  * A pre-depends is satisfied only if a package is already installed,
 936  * which a regular depends can be satisfied by a package which we want
 937  * to install.
 938  */
 939 static int package_satisfies_dependency(int package, int depend_type)
 940 {
 941         int status_num = search_status_hashtable(name_hashtable[package_hashtable[package]->name]);
 942
 943         /* status could be unknown if package is a pure virtual
 944          * provides which cannot satisfy any dependency by itself.
 945          */
 946         if (status_hashtable[status_num] == NULL)
 947                 return 0;
 948
 949         switch (depend_type) {
 950         case EDGE_PRE_DEPENDS:  return get_status(status_num, 3) == search_name_hashtable("installed");
 951         case EDGE_DEPENDS:      return get_status(status_num, 1) == search_name_hashtable("install");
 952         }
 953         return 0;
 954 }
 955
 956 static int check_deps(deb_file_t **deb_file, int deb_start /*, int dep_max_count - ?? */)
 957 {
 958         int *conflicts = NULL;
 959         int conflicts_num = 0;
 960         int i = deb_start;
 961         int j;
 962
 963         /* Check for conflicts
 964          * TODO: TEST if conflicts with other packages to be installed
 965          *
 966          * Add install packages and the packages they provide
 967          * to the list of files to check conflicts for
 968          */
 969
 970         /* Create array of package numbers to check against
 971          * installed package for conflicts*/
 972         while (deb_file[i] != NULL) {
 973                 const unsigned package_num = deb_file[i]->package;
 974                 conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
 975                 conflicts[conflicts_num] = package_num;
 976                 conflicts_num++;
 977                 /* add provides to conflicts list */
 978                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
 979                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
 980                                 const int conflicts_package_num = search_package_hashtable(
 981                                         package_hashtable[package_num]->edge[j]->name,
 982                                         package_hashtable[package_num]->edge[j]->version,
 983                                         package_hashtable[package_num]->edge[j]->operator);
 984                                 if (package_hashtable[conflicts_package_num] == NULL) {
 985                                         /* create a new package */
 986                                         common_node_t *new_node = xzalloc(sizeof(common_node_t));
 987                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
 988                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
 989                                         package_hashtable[conflicts_package_num] = new_node;
 990                                 }
 991                                 conflicts = xrealloc_vector(conflicts, 2, conflicts_num);
 992                                 conflicts[conflicts_num] = conflicts_package_num;
 993                                 conflicts_num++;
 994                         }
 995                 }
 996                 i++;
 997         }
 998
 999         /* Check conflicts */
1000         i = 0;
1001         while (deb_file[i] != NULL) {
1002                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
1003                 int status_num = 0;
1004                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1005
1006                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
1007                         i++;
1008                         continue;
1009                 }
1010
1011                 for (j = 0; j < package_node->num_of_edges; j++) {
1012                         const edge_t *package_edge = package_node->edge[j];
1013
1014                         if (package_edge->type == EDGE_CONFLICTS) {
1015                                 const unsigned package_num =
1016                                         search_package_hashtable(package_edge->name,
1017                                                                  package_edge->version,
1018                                                                  package_edge->operator);
1019                                 int result = 0;
1020                                 if (package_hashtable[package_num] != NULL) {
1021                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1022
1023                                         if (get_status(status_num, 1) == search_name_hashtable("install")) {
1024                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
1025                                                         package_edge->version, package_edge->operator);
1026                                         }
1027                                 }
1028
1029                                 if (result) {
1030                                         bb_error_msg_and_die("package %s conflicts with %s",
1031                                                 name_hashtable[package_node->name],
1032                                                 name_hashtable[package_edge->name]);
1033                                 }
1034                         }
1035                 }
1036                 i++;
1037         }
1038
1039
1040         /* Check dependendcies */
1041         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1042                 int status_num = 0;
1043                 int number_of_alternatives = 0;
1044                 const edge_t * root_of_alternatives = NULL;
1045                 const common_node_t *package_node = package_hashtable[i];
1046
1047                 /* If the package node does not exist then this
1048                  * package is a virtual one. In which case there are
1049                  * no dependencies to check.
1050                  */
1051                 if (package_node == NULL) continue;
1052
1053                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1054
1055                 /* If there is no status then this package is a
1056                  * virtual one provided by something else. In which
1057                  * case there are no dependencies to check.
1058                  */
1059                 if (status_hashtable[status_num] == NULL) continue;
1060
1061                 /* If we don't want this package installed then we may
1062                  * as well ignore it's dependencies.
1063                  */
1064                 if (get_status(status_num, 1) != search_name_hashtable("install")) {
1065                         continue;
1066                 }
1067
1068                 /* This code is tested only for EDGE_DEPENDS, since I
1069                  * have no suitable pre-depends available. There is no
1070                  * reason that it shouldn't work though :-)
1071                  */
1072                 for (j = 0; j < package_node->num_of_edges; j++) {
1073                         const edge_t *package_edge = package_node->edge[j];
1074                         unsigned package_num;
1075
1076                         if (package_edge->type == EDGE_OR_PRE_DEPENDS
1077                          || package_edge->type == EDGE_OR_DEPENDS
1078                         ) {     /* start an EDGE_OR_ list */
1079                                 number_of_alternatives = package_edge->version;
1080                                 root_of_alternatives = package_edge;
1081                                 continue;
1082                         }
1083                         if (number_of_alternatives == 0) {      /* not in the middle of an EDGE_OR_ list */
1084                                 number_of_alternatives = 1;
1085                                 root_of_alternatives = NULL;
1086                         }
1087
1088                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1089
1090                         if (package_edge->type == EDGE_PRE_DEPENDS ||
1091                             package_edge->type == EDGE_DEPENDS) {
1092                                 int result=1;
1093                                 status_num = 0;
1094
1095                                 /* If we are inside an alternative then check
1096                                  * this edge is the right type.
1097                                  *
1098                                  * EDGE_DEPENDS == OR_DEPENDS -1
1099                                  * EDGE_PRE_DEPENDS == OR_PRE_DEPENDS -1
1100                                  */
1101                                 if (root_of_alternatives && package_edge->type != root_of_alternatives->type - 1)
1102                                         bb_error_msg_and_die("fatal error, package dependencies corrupt: %d != %d - 1",
1103                                                              package_edge->type, root_of_alternatives->type);
1104
1105                                 if (package_hashtable[package_num] != NULL)
1106                                         result = !package_satisfies_dependency(package_num, package_edge->type);
1107
1108                                 if (result) { /* check for other package which provide what we are looking for */
1109                                         int provider = -1;
1110
1111                                         while ((provider = search_for_provides(package_edge->name, provider)) > -1) {
1112                                                 if (package_hashtable[provider] == NULL) {
1113                                                         puts("Have a provider but no package information for it");
1114                                                         continue;
1115                                                 }
1116                                                 result = !package_satisfies_dependency(provider, package_edge->type);
1117
1118                                                 if (result == 0)
1119                                                         break;
1120                                         }
1121                                 }
1122
1123                                 /* It must be already installed, or to be installed */
1124                                 number_of_alternatives--;
1125                                 if (result && number_of_alternatives == 0) {
1126                                         if (root_of_alternatives)
1127                                                 bb_error_msg_and_die(
1128                                                         "package %s %sdepends on %s, "
1129                                                         "which cannot be satisfied",
1130                                                         name_hashtable[package_node->name],
1131                                                         package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1132                                                         name_hashtable[root_of_alternatives->name]);
1133                                         bb_error_msg_and_die(
1134                                                 "package %s %sdepends on %s, which %s\n",
1135                                                 name_hashtable[package_node->name],
1136                                                 package_edge->type == EDGE_PRE_DEPENDS ? "pre-" : "",
1137                                                 name_hashtable[package_edge->name],
1138                                                 describe_status(status_num));
1139                                 }
1140                                 if (result == 0 && number_of_alternatives) {
1141                                         /* we've found a package which
1142                                          * satisfies the dependency,
1143                                          * so skip over the rest of
1144                                          * the alternatives.
1145                                          */
1146                                         j += number_of_alternatives;
1147                                         number_of_alternatives = 0;
1148                                 }
1149                         }
1150                 }
1151         }
1152         free(conflicts);
1153         return TRUE;
1154 }
1155
1156 static char **create_list(const char *filename)
1157 {
1158         FILE *list_stream;
1159         char **file_list;
1160         char *line;
1161         int count;
1162
1163         /* don't use [xw]fopen here, handle error ourself */
1164         list_stream = fopen_for_read(filename);
1165         if (list_stream == NULL) {
1166                 return NULL;
1167         }
1168
1169         file_list = NULL;
1170         count = 0;
1171         while ((line = xmalloc_fgetline(list_stream)) != NULL) {
1172                 file_list = xrealloc_vector(file_list, 2, count);
1173                 file_list[count++] = line;
1174                 /*file_list[count] = NULL; - xrealloc_vector did it */
1175         }
1176         fclose(list_stream);
1177
1178         return file_list;
1179 }
1180
1181 /* maybe i should try and hook this into remove_file.c somehow */
1182 static int remove_file_array(char **remove_names, char **exclude_names)
1183 {
1184         struct stat path_stat;
1185         int remove_flag = 1; /* not removed anything yet */
1186         int i, j;
1187
1188         if (remove_names == NULL) {
1189                 return 0;
1190         }
1191         for (i = 0; remove_names[i] != NULL; i++) {
1192                 if (exclude_names != NULL) {
1193                         for (j = 0; exclude_names[j] != NULL; j++) {
1194                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1195                                         goto skip;
1196                                 }
1197                         }
1198                 }
1199                 /* TODO: why we are checking lstat? we can just try rm/rmdir */
1200                 if (lstat(remove_names[i], &path_stat) < 0) {
1201                         continue;
1202                 }
1203                 if (S_ISDIR(path_stat.st_mode)) {
1204                         remove_flag &= rmdir(remove_names[i]); /* 0 if no error */
1205                 } else {
1206                         remove_flag &= unlink(remove_names[i]); /* 0 if no error */
1207                 }
1208  skip:
1209                 continue;
1210         }
1211         return (remove_flag == 0);
1212 }
1213
1214 static void run_package_script_or_die(const char *package_name, const char *script_type)
1215 {
1216         char *script_path;
1217         int result;
1218
1219         script_path = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, script_type);
1220
1221         /* If the file doesnt exist is isnt fatal */
1222         result = access(script_path, F_OK) ? EXIT_SUCCESS : system(script_path);
1223         free(script_path);
1224         if (result)
1225                 bb_error_msg_and_die("%s failed, exit code %d", script_type, result);
1226 }
1227
1228 /*
1229 The policy manual defines what scripts get called when and with
1230 what arguments. I realize that busybox does not support all of
1231 these scenarios, but it does support some of them; it does not,
1232 however, run them with any parameters in run_package_script_or_die().
1233 Here are the scripts:
1234
1235 preinst install
1236 preinst install <old_version>
1237 preinst upgrade <old_version>
1238 preinst abort_upgrade <new_version>
1239 postinst configure <most_recent_version>
1240 postinst abort-upgade <new_version>
1241 postinst abort-remove
1242 postinst abort-remove in-favour <package> <version>
1243 postinst abort-deconfigure in-favor <failed_install_package> removing <conflicting_package> <version>
1244 prerm remove
1245 prerm upgrade <new_version>
1246 prerm failed-upgrade <old_version>
1247 prerm remove in-favor <package> <new_version>
1248 prerm deconfigure in-favour <package> <version> removing <package> <version>
1249 postrm remove
1250 postrm purge
1251 postrm upgrade <new_version>
1252 postrm failed-upgrade <old_version>
1253 postrm abort-install
1254 postrm abort-install <old_version>
1255 postrm abort-upgrade <old_version>
1256 postrm disappear <overwriter> <version>
1257 */
1258 static const char *const all_control_files[] = {
1259         "preinst", "postinst", "prerm", "postrm",
1260         "list", "md5sums", "shlibs", "conffiles",
1261         "config", "templates"
1262 };
1263
1264 static char **all_control_list(const char *package_name)
1265 {
1266         unsigned i = 0;
1267         char **remove_files;
1268
1269         /* Create a list of all /var/lib/dpkg/info/<package> files */
1270         remove_files = xzalloc(sizeof(all_control_files) + sizeof(char*));
1271         while (i < ARRAY_SIZE(all_control_files)) {
1272                 remove_files[i] = xasprintf("/var/lib/dpkg/info/%s.%s",
1273                                 package_name, all_control_files[i]);
1274                 i++;
1275         }
1276
1277         return remove_files;
1278 }
1279
1280 static void free_array(char **array)
1281 {
1282         if (array) {
1283                 unsigned i = 0;
1284                 while (array[i]) {
1285                         free(array[i]);
1286                         i++;
1287                 }
1288                 free(array);
1289         }
1290 }
1291
1292 /* This function lists information on the installed packages. It loops through
1293  * the status_hashtable to retrieve the info. This results in smaller code than
1294  * scanning the status file. The resulting list, however, is unsorted.
1295  */
1296 static void list_packages(void)
1297 {
1298         int i;
1299
1300         puts("    Name           Version");
1301         puts("+++-==============-==============");
1302
1303         /* go through status hash, dereference package hash and finally strings */
1304         for (i = 0; i < STATUS_HASH_PRIME+1; i++) {
1305                 if (status_hashtable[i]) {
1306                         const char *stat_str;  /* status string */
1307                         const char *name_str;  /* package name */
1308                         const char *vers_str;  /* version */
1309                         char  s1, s2;          /* status abbreviations */
1310                         int   spccnt;          /* space count */
1311                         int   j;
1312
1313                         stat_str = name_hashtable[status_hashtable[i]->status];
1314                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1315                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1316
1317                         /* get abbreviation for status field 1 */
1318                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1319
1320                         /* get abbreviation for status field 2 */
1321                         for (j = 0, spccnt = 0; stat_str[j] && spccnt < 2; j++) {
1322                                 if (stat_str[j] == ' ') spccnt++;
1323                         }
1324                         s2 = stat_str[j];
1325
1326                         /* print out the line formatted like Debian dpkg */
1327                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1328                 }
1329         }
1330 }
1331
1332 static void remove_package(const unsigned package_num, int noisy)
1333 {
1334         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1335         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1336         const unsigned status_num = search_status_hashtable(package_name);
1337         const int package_name_length = strlen(package_name);
1338         char **remove_files;
1339         char **exclude_files;
1340         char list_name[package_name_length + 25];
1341         char conffile_name[package_name_length + 30];
1342
1343         if (noisy)
1344                 printf("Removing %s (%s)...\n", package_name, package_version);
1345
1346         /* Run prerm script */
1347         run_package_script_or_die(package_name, "prerm");
1348
1349         /* Create a list of files to remove, and a separate list of those to keep */
1350         sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1351         remove_files = create_list(list_name);
1352
1353         sprintf(conffile_name, "/var/lib/dpkg/info/%s.%s", package_name, "conffiles");
1354         exclude_files = create_list(conffile_name);
1355
1356         /* Some directories can't be removed straight away, so do multiple passes */
1357         while (remove_file_array(remove_files, exclude_files))
1358                 continue;
1359         free_array(exclude_files);
1360         free_array(remove_files);
1361
1362         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep  */
1363         exclude_files = xzalloc(sizeof(char*) * 3);
1364         exclude_files[0] = xstrdup(conffile_name);
1365         exclude_files[1] = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "postrm");
1366
1367         /* Create a list of all /var/lib/dpkg/info/<package> files */
1368         remove_files = all_control_list(package_name);
1369
1370         remove_file_array(remove_files, exclude_files);
1371         free_array(remove_files);
1372         free_array(exclude_files);
1373
1374         /* rename <package>.conffiles to <package>.list
1375          * The conffiles control file isn't required in Debian packages, so don't
1376          * error out if it's missing.  */
1377         rename(conffile_name, list_name);
1378
1379         /* Change package status */
1380         set_status(status_num, "config-files", 3);
1381 }
1382
1383 static void purge_package(const unsigned package_num)
1384 {
1385         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1386         const char *package_version = name_hashtable[package_hashtable[package_num]->version];
1387         const unsigned status_num = search_status_hashtable(package_name);
1388         char **remove_files;
1389         char **exclude_files;
1390         char list_name[strlen(package_name) + 25];
1391
1392         printf("Purging %s (%s)...\n", package_name, package_version);
1393
1394         /* Run prerm script */
1395         run_package_script_or_die(package_name, "prerm");
1396
1397         /* Create a list of files to remove */
1398         sprintf(list_name, "/var/lib/dpkg/info/%s.%s", package_name, "list");
1399         remove_files = create_list(list_name);
1400
1401         exclude_files = xzalloc(sizeof(char*));
1402
1403         /* Some directories cant be removed straight away, so do multiple passes */
1404         while (remove_file_array(remove_files, exclude_files)) /* repeat */;
1405         free_array(remove_files);
1406
1407         /* Create a list of all /var/lib/dpkg/info/<package> files */
1408         remove_files = all_control_list(package_name);
1409         remove_file_array(remove_files, exclude_files);
1410         free_array(remove_files);
1411         free(exclude_files);
1412
1413         /* Run postrm script */
1414         run_package_script_or_die(package_name, "postrm");
1415
1416         /* Change package status */
1417         set_status(status_num, "not-installed", 3);
1418 }
1419
1420 static archive_handle_t *init_archive_deb_ar(const char *filename)
1421 {
1422         archive_handle_t *ar_handle;
1423
1424         /* Setup an ar archive handle that refers to the gzip sub archive */
1425         ar_handle = init_handle();
1426         ar_handle->filter = filter_accept_list_reassign;
1427         ar_handle->src_fd = xopen(filename, O_RDONLY);
1428
1429         return ar_handle;
1430 }
1431
1432 static void init_archive_deb_control(archive_handle_t *ar_handle)
1433 {
1434         archive_handle_t *tar_handle;
1435
1436         /* Setup the tar archive handle */
1437         tar_handle = init_handle();
1438         tar_handle->src_fd = ar_handle->src_fd;
1439
1440         /* We don't care about data.tar.* or debian-binary, just control.tar.* */
1441 #if ENABLE_FEATURE_DEB_TAR_GZ
1442         llist_add_to(&(ar_handle->accept), (char*)"control.tar.gz");
1443 #endif
1444 #if ENABLE_FEATURE_DEB_TAR_BZ2
1445         llist_add_to(&(ar_handle->accept), (char*)"control.tar.bz2");
1446 #endif
1447
1448         /* Assign the tar handle as a subarchive of the ar handle */
1449         ar_handle->sub_archive = tar_handle;
1450 }
1451
1452 static void init_archive_deb_data(archive_handle_t *ar_handle)
1453 {
1454         archive_handle_t *tar_handle;
1455
1456         /* Setup the tar archive handle */
1457         tar_handle = init_handle();
1458         tar_handle->src_fd = ar_handle->src_fd;
1459
1460         /* We don't care about control.tar.* or debian-binary, just data.tar.* */
1461 #if ENABLE_FEATURE_DEB_TAR_GZ
1462         llist_add_to(&(ar_handle->accept), (char*)"data.tar.gz");
1463 #endif
1464 #if ENABLE_FEATURE_DEB_TAR_BZ2
1465         llist_add_to(&(ar_handle->accept), (char*)"data.tar.bz2");
1466 #endif
1467
1468         /* Assign the tar handle as a subarchive of the ar handle */
1469         ar_handle->sub_archive = tar_handle;
1470 }
1471
1472 static char *deb_extract_control_file_to_buffer(archive_handle_t *ar_handle, llist_t *myaccept)
1473 {
1474         ar_handle->sub_archive->action_data = data_extract_to_buffer;
1475         ar_handle->sub_archive->accept = myaccept;
1476         ar_handle->sub_archive->filter = filter_accept_list;
1477
1478         unpack_ar_archive(ar_handle);
1479         close(ar_handle->src_fd);
1480
1481         return ar_handle->sub_archive->buffer;
1482 }
1483
1484 static void FAST_FUNC data_extract_all_prefix(archive_handle_t *archive_handle)
1485 {
1486         char *name_ptr = archive_handle->file_header->name;
1487
1488         name_ptr += strspn(name_ptr, "./");
1489         if (name_ptr[0] != '\0') {
1490                 archive_handle->file_header->name = xasprintf("%s%s", archive_handle->buffer, name_ptr);
1491                 data_extract_all(archive_handle);
1492         }
1493 }
1494
1495 static void unpack_package(deb_file_t *deb_file)
1496 {
1497         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1498         const unsigned status_num = search_status_hashtable(package_name);
1499         const unsigned status_package_num = status_hashtable[status_num]->package;
1500         char *info_prefix;
1501         char *list_filename;
1502         archive_handle_t *archive_handle;
1503         FILE *out_stream;
1504         llist_t *accept_list;
1505         int i;
1506
1507         /* If existing version, remove it first */
1508         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1509                 /* Package is already installed, remove old version first */
1510                 printf("Preparing to replace %s %s (using %s)...\n", package_name,
1511                         name_hashtable[package_hashtable[status_package_num]->version],
1512                         deb_file->filename);
1513                 remove_package(status_package_num, 0);
1514         } else {
1515                 printf("Unpacking %s (from %s)...\n", package_name, deb_file->filename);
1516         }
1517
1518         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1519         info_prefix = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "");
1520         archive_handle = init_archive_deb_ar(deb_file->filename);
1521         init_archive_deb_control(archive_handle);
1522
1523         accept_list = NULL;
1524         i = 0;
1525         while (i < ARRAY_SIZE(all_control_files)) {
1526                 char *c = xasprintf("./%s", all_control_files[i]);
1527                 llist_add_to(&accept_list, c);
1528                 i++;
1529         }
1530         archive_handle->sub_archive->accept = accept_list;
1531         archive_handle->sub_archive->filter = filter_accept_list;
1532         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1533         archive_handle->sub_archive->buffer = info_prefix;
1534         archive_handle->sub_archive->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
1535         unpack_ar_archive(archive_handle);
1536
1537         /* Run the preinst prior to extracting */
1538         run_package_script_or_die(package_name, "preinst");
1539
1540         /* Extract data.tar.gz to the root directory */
1541         archive_handle = init_archive_deb_ar(deb_file->filename);
1542         init_archive_deb_data(archive_handle);
1543         archive_handle->sub_archive->action_data = data_extract_all_prefix;
1544         archive_handle->sub_archive->buffer = (char*)"/"; /* huh? */
1545         archive_handle->sub_archive->ah_flags |= ARCHIVE_EXTRACT_UNCONDITIONAL;
1546         unpack_ar_archive(archive_handle);
1547
1548         /* Create the list file */
1549         list_filename = xasprintf("/var/lib/dpkg/info/%s.%s", package_name, "list");
1550         out_stream = xfopen_for_write(list_filename);
1551         while (archive_handle->sub_archive->passed) {
1552                 /* the leading . has been stripped by data_extract_all_prefix already */
1553                 fputs(archive_handle->sub_archive->passed->data, out_stream);
1554                 fputc('\n', out_stream);
1555                 archive_handle->sub_archive->passed = archive_handle->sub_archive->passed->link;
1556         }
1557         fclose(out_stream);
1558
1559         /* change status */
1560         set_status(status_num, "install", 1);
1561         set_status(status_num, "unpacked", 3);
1562
1563         free(info_prefix);
1564         free(list_filename);
1565 }
1566
1567 static void configure_package(deb_file_t *deb_file)
1568 {
1569         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1570         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1571         const int status_num = search_status_hashtable(package_name);
1572
1573         printf("Setting up %s (%s)...\n", package_name, package_version);
1574
1575         /* Run the postinst script */
1576         /* TODO: handle failure gracefully */
1577         run_package_script_or_die(package_name, "postinst");
1578
1579         /* Change status to reflect success */
1580         set_status(status_num, "install", 1);
1581         set_status(status_num, "installed", 3);
1582 }
1583
1584 int dpkg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1585 int dpkg_main(int argc UNUSED_PARAM, char **argv)
1586 {
1587         deb_file_t **deb_file = NULL;
1588         status_node_t *status_node;
1589         char *str_f;
1590         int opt;
1591         int package_num;
1592         int deb_count = 0;
1593         int state_status;
1594         int status_num;
1595         int i;
1596         enum {
1597                 OPT_configure = 0x1,
1598                 OPT_force_ignore_depends = 0x2,
1599                 OPT_install = 0x4,
1600                 OPT_list_installed = 0x8,
1601                 OPT_purge = 0x10,
1602                 OPT_remove = 0x20,
1603                 OPT_unpack = 0x40,
1604         };
1605
1606         INIT_G();
1607
1608         opt = getopt32(argv, "CF:ilPru", &str_f);
1609         //if (opt & OPT_configure) ... // -C
1610         if (opt & OPT_force_ignore_depends) { // -F (--force in official dpkg)
1611                 if (strcmp(str_f, "depends"))
1612                         opt &= ~OPT_force_ignore_depends;
1613         }
1614         //if (opt & OPT_install) ... // -i
1615         //if (opt & OPT_list_installed) ... // -l
1616         //if (opt & OPT_purge) ... // -P
1617         //if (opt & OPT_remove) ... // -r
1618         //if (opt & OPT_unpack) ... // -u (--unpack in official dpkg)
1619         argv += optind;
1620         /* check for non-option argument if expected  */
1621         if (!opt || (!argv[0] && !(opt && OPT_list_installed)))
1622                 bb_show_usage();
1623
1624 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1625         index_status_file("/var/lib/dpkg/status");
1626
1627         /* if the list action was given print the installed packages and exit */
1628         if (opt & OPT_list_installed) {
1629                 list_packages();
1630                 return EXIT_SUCCESS;
1631         }
1632
1633         /* Read arguments and store relevant info in structs */
1634         while (*argv) {
1635                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1636                 deb_file = xrealloc_vector(deb_file, 2, deb_count);
1637                 deb_file[deb_count] = xzalloc(sizeof(deb_file[0][0]));
1638                 if (opt & (OPT_install | OPT_unpack)) {
1639                         /* -i/-u: require filename */
1640                         archive_handle_t *archive_handle;
1641                         llist_t *control_list = NULL;
1642
1643                         /* Extract the control file */
1644                         llist_add_to(&control_list, (char*)"./control");
1645                         archive_handle = init_archive_deb_ar(argv[0]);
1646                         init_archive_deb_control(archive_handle);
1647                         deb_file[deb_count]->control_file = deb_extract_control_file_to_buffer(archive_handle, control_list);
1648                         if (deb_file[deb_count]->control_file == NULL) {
1649                                 bb_error_msg_and_die("cannot extract control file");
1650                         }
1651                         deb_file[deb_count]->filename = xstrdup(argv[0]);
1652                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1653
1654                         if (package_num == -1) {
1655                                 bb_error_msg("invalid control file in %s", argv[0]);
1656                                 argv++;
1657                                 continue;
1658                         }
1659                         deb_file[deb_count]->package = (unsigned) package_num;
1660
1661                         /* Add the package to the status hashtable */
1662                         if (opt & (OPT_unpack | OPT_install)) {
1663                                 /* Try and find a currently installed version of this package */
1664                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1665                                 /* If no previous entry was found initialise a new entry */
1666                                 if (status_hashtable[status_num] == NULL
1667                                  || status_hashtable[status_num]->status == 0
1668                                 ) {
1669                                         status_node = xmalloc(sizeof(status_node_t));
1670                                         status_node->package = deb_file[deb_count]->package;
1671                                         /* reinstreq isnt changed to "ok" until the package control info
1672                                          * is written to the status file*/
1673                                         status_node->status = search_name_hashtable("install reinstreq not-installed");
1674                                         status_hashtable[status_num] = status_node;
1675                                 } else {
1676                                         set_status(status_num, "install", 1);
1677                                         set_status(status_num, "reinstreq", 2);
1678                                 }
1679                         }
1680                 } else if (opt & (OPT_configure | OPT_purge | OPT_remove)) {
1681                         /* -C/-p/-r: require package name */
1682                         deb_file[deb_count]->package = search_package_hashtable(
1683                                         search_name_hashtable(argv[0]),
1684                                         search_name_hashtable("ANY"), VER_ANY);
1685                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1686                                 bb_error_msg_and_die("package %s is uninstalled or unknown", argv[0]);
1687                         }
1688                         package_num = deb_file[deb_count]->package;
1689                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1690                         state_status = get_status(status_num, 3);
1691
1692                         /* check package status is "installed" */
1693                         if (opt & OPT_remove) {
1694                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0
1695                                  || strcmp(name_hashtable[state_status], "config-files") == 0
1696                                 ) {
1697                                         bb_error_msg_and_die("%s is already removed", name_hashtable[package_hashtable[package_num]->name]);
1698                                 }
1699                                 set_status(status_num, "deinstall", 1);
1700                         } else if (opt & OPT_purge) {
1701                                 /* if package status is "conf-files" then its ok */
1702                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1703                                         bb_error_msg_and_die("%s is already purged", name_hashtable[package_hashtable[package_num]->name]);
1704                                 }
1705                                 set_status(status_num, "purge", 1);
1706                         }
1707                 }
1708                 deb_count++;
1709                 argv++;
1710         }
1711         if (!deb_count)
1712                 bb_error_msg_and_die("no package files specified");
1713         deb_file[deb_count] = NULL;
1714
1715         /* Check that the deb file arguments are installable */
1716         if (!(opt & OPT_force_ignore_depends)) {
1717                 if (!check_deps(deb_file, 0 /*, deb_count*/)) {
1718                         bb_error_msg_and_die("dependency check failed");
1719                 }
1720         }
1721
1722         /* TODO: install or remove packages in the correct dependency order */
1723         for (i = 0; i < deb_count; i++) {
1724                 /* Remove or purge packages */
1725                 if (opt & OPT_remove) {
1726                         remove_package(deb_file[i]->package, 1);
1727                 }
1728                 else if (opt & OPT_purge) {
1729                         purge_package(deb_file[i]->package);
1730                 }
1731                 else if (opt & OPT_unpack) {
1732                         unpack_package(deb_file[i]);
1733                 }
1734                 else if (opt & OPT_install) {
1735                         unpack_package(deb_file[i]);
1736                         /* package is configured in second pass below */
1737                 }
1738                 else if (opt & OPT_configure) {
1739                         configure_package(deb_file[i]);
1740                 }
1741         }
1742         /* configure installed packages */
1743         if (opt & OPT_install) {
1744                 for (i = 0; i < deb_count; i++)
1745                         configure_package(deb_file[i]);
1746         }
1747
1748         write_status_file(deb_file);
1749
1750         if (ENABLE_FEATURE_CLEAN_UP) {
1751                 for (i = 0; i < deb_count; i++) {
1752                         free(deb_file[i]->control_file);
1753                         free(deb_file[i]->filename);
1754                         free(deb_file[i]);
1755                 }
1756
1757                 free(deb_file);
1758
1759                 for (i = 0; i < NAME_HASH_PRIME; i++) {
1760                         free(name_hashtable[i]);
1761                 }
1762
1763                 for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1764                         free_package(package_hashtable[i]);
1765                 }
1766
1767                 for (i = 0; i < STATUS_HASH_PRIME; i++) {
1768                         free(status_hashtable[i]);
1769                 }
1770
1771                 free(status_hashtable);
1772                 free(package_hashtable);
1773                 free(name_hashtable);
1774         }
1775
1776         return EXIT_SUCCESS;
1777 }