archival/dpkg.c

   1 /*
   2  *  Mini dpkg implementation for busybox.
   3  *  This is not meant as a replacemnt for dpkg
   4  *
   5  *  Written By Glenn McGrath with the help of others
   6  *  Copyright (C) 2001 by Glenn McGrath
   7  *
   8  *  Started life as a busybox implementation of udpkg
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU Library General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24
  25 /*
  26  * Known difference between busybox dpkg and the official dpkg that i dont
  27  * consider important, its worth keeping a note of differences anyway, just to
  28  * make it easier to maintain.
  29  *  - The first value for the Confflile: field isnt placed on a new line.
  30  *  - The <package>.control file is extracted and kept in the info dir.
  31  *  - When installing a package the Status: field is placed at the end of the
  32  *      section, rather than just after the Package: field.
  33  *  - Packages with previously unknown status are inserted at the begining of
  34  *      the status file
  35  *
  36  * Bugs that need to be fixed
  37  *  - (unknown, please let me know when you find any)
  38  *
  39  */
  40
  41 #include <getopt.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include "unarchive.h"
  46 #include "busybox.h"
  47
  48 /* NOTE: If you vary HASH_PRIME sizes be aware,
  49  * 1) Tweaking these will have a big effect on how much memory this program uses.
  50  * 2) For computational efficiency these hash tables should be at least 20%
  51  *    larger than the maximum number of elements stored in it.
  52  * 3) All _HASH_PRIME's must be a prime number or chaos is assured, if your looking
  53  *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
  54  * 4) If you go bigger than 15 bits you may get into trouble (untested) as its
  55  *    sometimes cast to an unsigned int, if you go to 16 bit you will overlap
  56  *    int's and chaos is assured, 16381 is the max prime for 14 bit field
  57  */
  58
  59 /* NAME_HASH_PRIME, Stores package names and versions,
  60  * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
  61  * as there a lot of duplicate version numbers */
  62 #define NAME_HASH_PRIME 16381
  63 char *name_hashtable[NAME_HASH_PRIME + 1];
  64
  65 /* PACKAGE_HASH_PRIME, Maximum number of unique packages,
  66  * It must not be smaller than STATUS_HASH_PRIME,
  67  * Currently only packages from status_hashtable are stored in here, but in
  68  * future this may be used to store packages not only from a status file,
  69  * but an available_hashtable, and even multiple packages files.
  70  * Package can be stored more than once if they have different versions.
  71  * e.g. The same package may have different versions in the status file
  72  *      and available file */
  73 #define PACKAGE_HASH_PRIME 10007
  74 typedef struct edge_s {
  75         unsigned int operator:3;
  76         unsigned int type:4;
  77         unsigned int name:14;
  78         unsigned int version:14;
  79 } edge_t;
  80
  81 typedef struct common_node_s {
  82         unsigned int name:14;
  83         unsigned int version:14;
  84         unsigned int num_of_edges:14;
  85         edge_t **edge;
  86 } common_node_t;
  87 common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
  88
  89 /* Currently it doesnt store packages that have state-status of not-installed
  90  * So it only really has to be the size of the maximum number of packages
  91  * likely to be installed at any one time, so there is a bit of leaway here */
  92 #define STATUS_HASH_PRIME 8191
  93 typedef struct status_node_s {
  94         unsigned int package:14;        /* has to fit PACKAGE_HASH_PRIME */
  95         unsigned int status:14;         /* has to fit STATUS_HASH_PRIME */
  96 } status_node_t;
  97 status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
  98
  99 /* Even numbers are for 'extras', like ored dependecies or null */
 100 enum edge_type_e {
 101         EDGE_NULL = 0,
 102         EDGE_PRE_DEPENDS = 1,
 103         EDGE_OR_PRE_DEPENDS = 2,
 104         EDGE_DEPENDS = 3,
 105         EDGE_OR_DEPENDS = 4,
 106         EDGE_REPLACES = 5,
 107         EDGE_PROVIDES = 7,
 108         EDGE_CONFLICTS = 9,
 109         EDGE_SUGGESTS = 11,
 110         EDGE_RECOMMENDS = 13,
 111         EDGE_ENHANCES = 15
 112 };
 113 enum operator_e {
 114         VER_NULL = 0,
 115         VER_EQUAL = 1,
 116         VER_LESS = 2,
 117         VER_LESS_EQUAL = 3,
 118         VER_MORE = 4,
 119         VER_MORE_EQUAL = 5,
 120         VER_ANY = 6
 121 };
 122
 123 enum dpkg_opt_e {
 124         dpkg_opt_purge = 1,
 125         dpkg_opt_remove = 2,
 126         dpkg_opt_unpack = 4,
 127         dpkg_opt_configure = 8,
 128         dpkg_opt_install = 16,
 129         dpkg_opt_package_name = 32,
 130         dpkg_opt_filename = 64,
 131         dpkg_opt_list_installed = 128,
 132         dpkg_opt_force_ignore_depends = 256
 133 };
 134
 135 typedef struct deb_file_s {
 136         char *control_file;
 137         char *filename;
 138         unsigned int package:14;
 139 } deb_file_t;
 140
 141
 142 void make_hash(const char *key, unsigned int *start, unsigned int *decrement, const int hash_prime)
 143 {
 144         unsigned long int hash_num = key[0];
 145         int len = strlen(key);
 146         int i;
 147
 148         /* Maybe i should have uses a "proper" hashing algorithm here instead
 149          * of making one up myself, seems to be working ok though. */
 150         for(i = 1; i < len; i++) {
 151                 /* shifts the ascii based value and adds it to previous value
 152                  * shift amount is mod 24 because long int is 32 bit and data
 153                  * to be shifted is 8, dont want to shift data to where it has
 154                  * no effect*/
 155                 hash_num += ((key[i] + key[i-1]) << ((key[i] * i) % 24));
 156         }
 157         *start = (unsigned int) hash_num % hash_prime;
 158         *decrement = (unsigned int) 1 + (hash_num % (hash_prime - 1));
 159 }
 160
 161 /* this adds the key to the hash table */
 162 int search_name_hashtable(const char *key)
 163 {
 164         unsigned int probe_address = 0;
 165         unsigned int probe_decrement = 0;
 166 //      char *temp;
 167
 168         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 169         while(name_hashtable[probe_address] != NULL) {
 170                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 171                         return(probe_address);
 172                 } else {
 173                         probe_address -= probe_decrement;
 174                         if ((int)probe_address < 0) {
 175                                 probe_address += NAME_HASH_PRIME;
 176                         }
 177                 }
 178         }
 179         name_hashtable[probe_address] = xstrdup(key);
 180         return(probe_address);
 181 }
 182
 183 /* this DOESNT add the key to the hashtable
 184  * TODO make it consistent with search_name_hashtable
 185  */
 186 unsigned int search_status_hashtable(const char *key)
 187 {
 188         unsigned int probe_address = 0;
 189         unsigned int probe_decrement = 0;
 190
 191         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 192         while(status_hashtable[probe_address] != NULL) {
 193                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 194                         break;
 195                 } else {
 196                         probe_address -= probe_decrement;
 197                         if ((int)probe_address < 0) {
 198                                 probe_address += STATUS_HASH_PRIME;
 199                         }
 200                 }
 201         }
 202         return(probe_address);
 203 }
 204
 205 /* Need to rethink version comparison, maybe the official dpkg has something i can use ? */
 206 int version_compare_part(const char *version1, const char *version2)
 207 {
 208         int upstream_len1 = 0;
 209         int upstream_len2 = 0;
 210         char *name1_char;
 211         char *name2_char;
 212         int len1 = 0;
 213         int len2 = 0;
 214         int tmp_int;
 215         int ver_num1;
 216         int ver_num2;
 217         int ret;
 218
 219         if (version1 == NULL) {
 220                 version1 = xstrdup("");
 221         }
 222         if (version2 == NULL) {
 223                 version2 = xstrdup("");
 224         }
 225         upstream_len1 = strlen(version1);
 226         upstream_len2 = strlen(version2);
 227
 228         while ((len1 < upstream_len1) || (len2 < upstream_len2)) {
 229                 /* Compare non-digit section */
 230                 tmp_int = strcspn(&version1[len1], "0123456789");
 231                 name1_char = xstrndup(&version1[len1], tmp_int);
 232                 len1 += tmp_int;
 233                 tmp_int = strcspn(&version2[len2], "0123456789");
 234                 name2_char = xstrndup(&version2[len2], tmp_int);
 235                 len2 += tmp_int;
 236                 tmp_int = strcmp(name1_char, name2_char);
 237                 free(name1_char);
 238                 free(name2_char);
 239                 if (tmp_int != 0) {
 240                         ret = tmp_int;
 241                         goto cleanup_version_compare_part;
 242                 }
 243
 244                 /* Compare digits */
 245                 tmp_int = strspn(&version1[len1], "0123456789");
 246                 name1_char = xstrndup(&version1[len1], tmp_int);
 247                 len1 += tmp_int;
 248                 tmp_int = strspn(&version2[len2], "0123456789");
 249                 name2_char = xstrndup(&version2[len2], tmp_int);
 250                 len2 += tmp_int;
 251                 ver_num1 = atoi(name1_char);
 252                 ver_num2 = atoi(name2_char);
 253                 free(name1_char);
 254                 free(name2_char);
 255                 if (ver_num1 < ver_num2) {
 256                         ret = -1;
 257                         goto cleanup_version_compare_part;
 258                 }
 259                 else if (ver_num1 > ver_num2) {
 260                         ret = 1;
 261                         goto cleanup_version_compare_part;
 262                 }
 263         }
 264         ret = 0;
 265 cleanup_version_compare_part:
 266         return(ret);
 267 }
 268
 269 /* if ver1 < ver2 return -1,
 270  * if ver1 = ver2 return 0,
 271  * if ver1 > ver2 return 1,
 272  */
 273 int version_compare(const unsigned int ver1, const unsigned int ver2)
 274 {
 275         char *ch_ver1 = name_hashtable[ver1];
 276         char *ch_ver2 = name_hashtable[ver2];
 277
 278         char epoch1, epoch2;
 279         char *deb_ver1, *deb_ver2;
 280         char *ver1_ptr, *ver2_ptr;
 281         char *upstream_ver1;
 282         char *upstream_ver2;
 283         int result;
 284
 285         /* Compare epoch */
 286         if (ch_ver1[1] == ':') {
 287                 epoch1 = ch_ver1[0];
 288                 ver1_ptr = strchr(ch_ver1, ':') + 1;
 289         } else {
 290                 epoch1 = '0';
 291                 ver1_ptr = ch_ver1;
 292         }
 293         if (ch_ver2[1] == ':') {
 294                 epoch2 = ch_ver2[0];
 295                 ver2_ptr = strchr(ch_ver2, ':') + 1;
 296         } else {
 297                 epoch2 = '0';
 298                 ver2_ptr = ch_ver2;
 299         }
 300         if (epoch1 < epoch2) {
 301                 return(-1);
 302         }
 303         else if (epoch1 > epoch2) {
 304                 return(1);
 305         }
 306
 307         /* Compare upstream version */
 308         upstream_ver1 = xstrdup(ver1_ptr);
 309         upstream_ver2 = xstrdup(ver2_ptr);
 310
 311         /* Chop off debian version, and store for later use */
 312         deb_ver1 = strrchr(upstream_ver1, '-');
 313         deb_ver2 = strrchr(upstream_ver2, '-');
 314         if (deb_ver1) {
 315                 deb_ver1[0] = '\0';
 316                 deb_ver1++;
 317         }
 318         if (deb_ver2) {
 319                 deb_ver2[0] = '\0';
 320                 deb_ver2++;
 321         }
 322         result = version_compare_part(upstream_ver1, upstream_ver2);
 323
 324         free(upstream_ver1);
 325         free(upstream_ver2);
 326
 327         if (result != 0) {
 328                 return(result);
 329         }
 330
 331         /* Compare debian versions */
 332         return(version_compare_part(deb_ver1, deb_ver2));
 333 }
 334
 335 int test_version(const unsigned int version1, const unsigned int version2, const unsigned int operator)
 336 {
 337         const int version_result = version_compare(version1, version2);
 338         switch(operator) {
 339                 case (VER_ANY):
 340                         return(TRUE);
 341                 case (VER_EQUAL):
 342                         if (version_result == 0) {
 343                                 return(TRUE);
 344                         }
 345                         break;
 346                 case (VER_LESS):
 347                         if (version_result < 0) {
 348                                 return(TRUE);
 349                         }
 350                         break;
 351                 case (VER_LESS_EQUAL):
 352                         if (version_result <= 0) {
 353                                 return(TRUE);
 354                         }
 355                         break;
 356                 case (VER_MORE):
 357                         if (version_result > 0) {
 358                                 return(TRUE);
 359                         }
 360                         break;
 361                 case (VER_MORE_EQUAL):
 362                         if (version_result >= 0) {
 363                                 return(TRUE);
 364                         }
 365                         break;
 366         }
 367         return(FALSE);
 368 }
 369
 370
 371 int search_package_hashtable(const unsigned int name, const unsigned int version, const unsigned int operator)
 372 {
 373         unsigned int probe_address = 0;
 374         unsigned int probe_decrement = 0;
 375
 376         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 377         while(package_hashtable[probe_address] != NULL) {
 378                 if (package_hashtable[probe_address]->name == name) {
 379                         if (operator == VER_ANY) {
 380                                 return(probe_address);
 381                         }
 382                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 383                                 return(probe_address);
 384                         }
 385                 }
 386                 probe_address -= probe_decrement;
 387                 if ((int)probe_address < 0) {
 388                         probe_address += PACKAGE_HASH_PRIME;
 389                 }
 390         }
 391         return(probe_address);
 392 }
 393
 394 /*
 395  * Create one new node and one new edge for every dependency.
 396  */
 397 void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned int edge_type)
 398 {
 399         char *line = xstrdup(whole_line);
 400         char *line2;
 401         char *line_ptr1 = NULL;
 402         char *line_ptr2 = NULL;
 403         char *field;
 404         char *field2;
 405         char *version;
 406         edge_t *edge;
 407         int offset_ch;
 408         int type;
 409
 410         field = strtok_r(line, ",", &line_ptr1);
 411         do {
 412                 line2 = xstrdup(field);
 413                 field2 = strtok_r(line2, "|", &line_ptr2);
 414                 if ((edge_type == EDGE_DEPENDS) && (strcmp(field, field2) != 0)) {
 415                         type = EDGE_OR_DEPENDS;
 416                 }
 417                 else if ((edge_type == EDGE_PRE_DEPENDS) && (strcmp(field, field2) != 0)) {
 418                         type = EDGE_OR_PRE_DEPENDS;
 419                 } else {
 420                         type = edge_type;
 421                 }
 422
 423                 do {
 424                         edge = (edge_t *) xmalloc(sizeof(edge_t));
 425                         edge->type = type;
 426
 427                         /* Skip any extra leading spaces */
 428                         field2 += strspn(field2, " ");
 429
 430                         /* Get dependency version info */
 431                         version = strchr(field2, '(');
 432                         if (version == NULL) {
 433                                 edge->operator = VER_ANY;
 434                                 /* Get the versions hash number, adding it if the number isnt already in there */
 435                                 edge->version = search_name_hashtable("ANY");
 436                         } else {
 437                                 /* Skip leading ' ' or '(' */
 438                                 version += strspn(field2, " ");
 439                                 version += strspn(version, "(");
 440                                 /* Calculate length of any operator charactors */
 441                                 offset_ch = strspn(version, "<=>");
 442                                 /* Determine operator */
 443                                 if (offset_ch > 0) {
 444                                         if (strncmp(version, "=", offset_ch) == 0) {
 445                                                 edge->operator = VER_EQUAL;
 446                                         }
 447                                         else if (strncmp(version, "<<", offset_ch) == 0) {
 448                                                 edge->operator = VER_LESS;
 449                                         }
 450                                         else if (strncmp(version, "<=", offset_ch) == 0) {
 451                                                 edge->operator = VER_LESS_EQUAL;
 452                                         }
 453                                         else if (strncmp(version, ">>", offset_ch) == 0) {
 454                                                 edge->operator = VER_MORE;
 455                                         }
 456                                         else if (strncmp(version, ">=", offset_ch) == 0) {
 457                                                 edge->operator = VER_MORE_EQUAL;
 458                                         } else {
 459                                                 error_msg_and_die("Illegal operator\n");
 460                                         }
 461                                 }
 462                                 /* skip to start of version numbers */
 463                                 version += offset_ch;
 464                                 version += strspn(version, " ");
 465
 466                                 /* Truncate version at trailing ' ' or ')' */
 467                                 version[strcspn(version, " )")] = '\0';
 468                                 /* Get the versions hash number, adding it if the number isnt already in there */
 469                                 edge->version = search_name_hashtable(version);
 470                         }
 471
 472                         /* Get the dependency name */
 473                         field2[strcspn(field2, " (")] = '\0';
 474                         edge->name = search_name_hashtable(field2);
 475
 476                         /* link the new edge to the current node */
 477                         parent_node->num_of_edges++;
 478                         parent_node->edge = xrealloc(parent_node->edge, sizeof(edge_t) * (parent_node->num_of_edges + 1));
 479                         parent_node->edge[parent_node->num_of_edges - 1] = edge;
 480                 } while ((field2 = strtok_r(NULL, "|", &line_ptr2)) != NULL);
 481                 free(line2);
 482         } while ((field = strtok_r(NULL, ",", &line_ptr1)) != NULL);
 483         free(line);
 484
 485         return;
 486 }
 487
 488 void free_package(common_node_t *node)
 489 {
 490         int i;
 491         if (node != NULL) {
 492                 for (i = 0; i < node->num_of_edges; i++) {
 493                         if (node->edge[i] != NULL) {
 494                                 free(node->edge[i]);
 495                         }
 496                 }
 497                 if (node->edge != NULL) {
 498                         free(node->edge);
 499                 }
 500                 if (node != NULL) {
 501                         free(node);
 502                 }
 503         }
 504 }
 505
 506 unsigned int fill_package_struct(char *control_buffer)
 507 {
 508         common_node_t *new_node = (common_node_t *) xcalloc(1, sizeof(common_node_t));
 509
 510         char *field_name;
 511         char *field_value;
 512         int field_start = 0;
 513         int num = -1;
 514         int buffer_length = strlen(control_buffer);
 515
 516         new_node->version = search_name_hashtable("unknown");
 517         while (field_start < buffer_length) {
 518                 field_start += read_package_field(&control_buffer[field_start],
 519                                 &field_name, &field_value);
 520
 521                 if (field_name == NULL) {
 522                         goto fill_package_struct_cleanup; // Oh no, the dreaded goto statement !!
 523                 }
 524
 525                 if (strcmp(field_name, "Package") == 0) {
 526                         new_node->name = search_name_hashtable(field_value);
 527                 }
 528                 else if (strcmp(field_name, "Version") == 0) {
 529                         new_node->version = search_name_hashtable(field_value);
 530                 }
 531                 else if (strcmp(field_name, "Pre-Depends") == 0) {
 532                         add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 533                 }
 534                 else if (strcmp(field_name, "Depends") == 0) {
 535                         add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 536                 }
 537                 else if (strcmp(field_name, "Replaces") == 0) {
 538                         add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 539                 }
 540                 else if (strcmp(field_name, "Provides") == 0) {
 541                         add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 542                 }
 543                 else if (strcmp(field_name, "Conflicts") == 0) {
 544                         add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 545                 }
 546                 else if (strcmp(field_name, "Suggests") == 0) {
 547                         add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 548                 }
 549                 else if (strcmp(field_name, "Recommends") == 0) {
 550                         add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 551                 }
 552                 else if (strcmp(field_name, "Enhances") == 0) {
 553                         add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 554                 }
 555 fill_package_struct_cleanup:
 556                 if (field_name) {
 557                         free(field_name);
 558                 }
 559                 if (field_value) {
 560                         free(field_value);
 561                 }
 562         }
 563
 564         if (new_node->version == search_name_hashtable("unknown")) {
 565                 free_package(new_node);
 566                 return(-1);
 567         }
 568         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 569         if (package_hashtable[num] == NULL) {
 570                 package_hashtable[num] = new_node;
 571         } else {
 572                 free_package(new_node);
 573         }
 574         return(num);
 575 }
 576
 577 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
 578 unsigned int get_status(const unsigned int status_node, const int num)
 579 {
 580         char *status_string = name_hashtable[status_hashtable[status_node]->status];
 581         char *state_sub_string;
 582         unsigned int state_sub_num;
 583         int len;
 584         int i;
 585
 586         /* set tmp_string to point to the start of the word number */
 587         for (i = 1; i < num; i++) {
 588                 /* skip past a word */
 589                 status_string += strcspn(status_string, " ");
 590                 /* skip past the seperating spaces */
 591                 status_string += strspn(status_string, " ");
 592         }
 593         len = strcspn(status_string, " \n\0");
 594         state_sub_string = xstrndup(status_string, len);
 595         state_sub_num = search_name_hashtable(state_sub_string);
 596         free(state_sub_string);
 597         return(state_sub_num);
 598 }
 599
 600 void set_status(const unsigned int status_node_num, const char *new_value, const int position)
 601 {
 602         const unsigned int new_value_len = strlen(new_value);
 603         const unsigned int new_value_num = search_name_hashtable(new_value);
 604         unsigned int want = get_status(status_node_num, 1);
 605         unsigned int flag = get_status(status_node_num, 2);
 606         unsigned int status = get_status(status_node_num, 3);
 607         int want_len = strlen(name_hashtable[want]);
 608         int flag_len = strlen(name_hashtable[flag]);
 609         int status_len = strlen(name_hashtable[status]);
 610         char *new_status;
 611
 612         switch (position) {
 613                 case (1):
 614                         want = new_value_num;
 615                         want_len = new_value_len;
 616                         break;
 617                 case (2):
 618                         flag = new_value_num;
 619                         flag_len = new_value_len;
 620                         break;
 621                 case (3):
 622                         status = new_value_num;
 623                         status_len = new_value_len;
 624                         break;
 625                 default:
 626                         error_msg_and_die("DEBUG ONLY: this shouldnt happen");
 627         }
 628
 629         new_status = (char *) xmalloc(want_len + flag_len + status_len + 3);
 630         sprintf(new_status, "%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
 631         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
 632         free(new_status);
 633         return;
 634 }
 635
 636 void index_status_file(const char *filename)
 637 {
 638         FILE *status_file;
 639         char *control_buffer;
 640         char *status_line;
 641         status_node_t *status_node = NULL;
 642         unsigned int status_num;
 643
 644         status_file = xfopen(filename, "r");
 645         while ((control_buffer = fgets_str(status_file, "\n\n")) != NULL) {
 646                 const unsigned int package_num = fill_package_struct(control_buffer);
 647                 if (package_num != -1) {
 648                         status_node = xmalloc(sizeof(status_node_t));
 649                         /* fill_package_struct doesnt handle the status field */
 650                         status_line = strstr(control_buffer, "Status:");
 651                         if (status_line != NULL) {
 652                                 status_line += 7;
 653                                 status_line += strspn(status_line, " \n\t");
 654                                 status_line = xstrndup(status_line, strcspn(status_line, "\n\0"));
 655                                 status_node->status = search_name_hashtable(status_line);
 656                                 free(status_line);
 657                         }
 658                         status_node->package = package_num;
 659                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
 660                         status_hashtable[status_num] = status_node;
 661                 }
 662                 free(control_buffer);
 663         }
 664         fclose(status_file);
 665         return;
 666 }
 667
 668
 669 char *get_depends_field(common_node_t *package, const int depends_type)
 670 {
 671         char *depends = NULL;
 672         char *old_sep = (char *)xcalloc(1, 3);
 673         char *new_sep = (char *)xcalloc(1, 3);
 674         int line_size = 0;
 675         int depends_size;
 676
 677         int i;
 678
 679         for (i = 0; i < package->num_of_edges; i++) {
 680                 if ((package->edge[i]->type == EDGE_OR_PRE_DEPENDS) ||
 681                         (package->edge[i]->type == EDGE_OR_DEPENDS)) {
 682                 }
 683
 684                 if ((package->edge[i]->type == depends_type) ||
 685                         (package->edge[i]->type == depends_type + 1)) {
 686                         /* Check if its the first time through */
 687
 688                         depends_size = 8 + strlen(name_hashtable[package->edge[i]->name])
 689                                 + strlen(name_hashtable[package->edge[i]->version]);
 690                         line_size += depends_size;
 691                         depends = (char *) xrealloc(depends, line_size + 1);
 692
 693                         /* Check to see if this dependency is the type we are looking for
 694                          * +1 to check for 'extra' types, e.g. ored dependecies */
 695                         strcpy(old_sep, new_sep);
 696                         if (package->edge[i]->type == depends_type) {
 697                                 strcpy(new_sep, ", ");
 698                         }
 699                         else if (package->edge[i]->type == depends_type + 1) {
 700                                 strcpy(new_sep, "| ");
 701                         }
 702
 703                         if (depends_size == line_size) {
 704                                 strcpy(depends, "");
 705                         } else {
 706                                 if ((strcmp(old_sep, "| ") == 0) && (strcmp(new_sep, "| ") == 0)) {
 707                                         strcat(depends, " | ");
 708                                 } else {
 709                                         strcat(depends, ", ");
 710                                 }
 711                         }
 712
 713                         strcat(depends, name_hashtable[package->edge[i]->name]);
 714                         if (strcmp(name_hashtable[package->edge[i]->version], "NULL") != 0) {
 715                                 if (package->edge[i]->operator == VER_EQUAL) {
 716                                         strcat(depends, " (= ");
 717                                 }
 718                                 else if (package->edge[i]->operator == VER_LESS) {
 719                                         strcat(depends, " (<< ");
 720                                 }
 721                                 else if (package->edge[i]->operator == VER_LESS_EQUAL) {
 722                                         strcat(depends, " (<= ");
 723                                 }
 724                                 else if (package->edge[i]->operator == VER_MORE) {
 725                                         strcat(depends, " (>> ");
 726                                 }
 727                                 else if (package->edge[i]->operator == VER_MORE_EQUAL) {
 728                                         strcat(depends, " (>= ");
 729                                 } else {
 730                                         strcat(depends, " (");
 731                                 }
 732                                 strcat(depends, name_hashtable[package->edge[i]->version]);
 733                                 strcat(depends, ")");
 734                         }
 735                 }
 736         }
 737         return(depends);
 738 }
 739
 740 void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
 741 {
 742         char *name;
 743         char *value;
 744         int start = 0;
 745         while (1) {
 746                 start += read_package_field(&control_buffer[start], &name, &value);
 747                 if (name == NULL) {
 748                         break;
 749                 }
 750                 if (strcmp(name, "Status") != 0) {
 751                         fprintf(new_status_file, "%s: %s\n", name, value);
 752                 }
 753         }
 754         return;
 755 }
 756
 757 /* This could do with a cleanup */
 758 void write_status_file(deb_file_t **deb_file)
 759 {
 760         FILE *old_status_file = xfopen("/var/lib/dpkg/status", "r");
 761         FILE *new_status_file = xfopen("/var/lib/dpkg/status.udeb", "w");
 762         char *package_name;
 763         char *status_from_file;
 764         char *control_buffer = NULL;
 765         char *tmp_string;
 766         int status_num;
 767         int field_start = 0;
 768         int write_flag;
 769         int i = 0;
 770
 771         /* Update previously known packages */
 772         while ((control_buffer = fgets_str(old_status_file, "\n\n")) != NULL) {
 773                 if ((tmp_string = strstr(control_buffer, "Package:")) == NULL) {
 774                         continue;
 775                 }
 776
 777                 tmp_string += 8;
 778                 tmp_string += strspn(tmp_string, " \n\t");
 779                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n\0"));
 780                 write_flag = FALSE;
 781                 tmp_string = strstr(control_buffer, "Status:");
 782                 if (tmp_string != NULL) {
 783                         /* Seperate the status value from the control buffer */
 784                         tmp_string += 7;
 785                         tmp_string += strspn(tmp_string, " \n\t");
 786                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 787                 } else {
 788                         status_from_file = NULL;
 789                 }
 790
 791                 /* Find this package in the status hashtable */
 792                 status_num = search_status_hashtable(package_name);
 793                 if (status_hashtable[status_num] != NULL) {
 794                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 795                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 796                                 /* New status isnt exactly the same as old status */
 797                                 const int state_status = get_status(status_num, 3);
 798                                 if ((strcmp("installed", name_hashtable[state_status]) == 0) ||
 799                                         (strcmp("unpacked", name_hashtable[state_status]) == 0)) {
 800                                         /* We need to add the control file from the package */
 801                                         i = 0;
 802                                         while(deb_file[i] != NULL) {
 803                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 804                                                         /* Write a status file entry with a modified status */
 805                                                         /* remove trailing \n's */
 806                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 807                                                         set_status(status_num, "ok", 2);
 808                                                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 809                                                         write_flag = TRUE;
 810                                                         break;
 811                                                 }
 812                                                 i++;
 813                                         }
 814                                         /* This is temperary, debugging only */
 815                                         if (deb_file[i] == NULL) {
 816                                                 error_msg_and_die("ALERT: Couldnt find a control file, your status file may be broken, status may be incorrect for %s", package_name);
 817                                         }
 818                                 }
 819                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 820                                         /* Only write the Package, Status, Priority and Section lines */
 821                                         fprintf(new_status_file, "Package: %s\n", package_name);
 822                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 823
 824                                         while (1) {
 825                                                 char *field_name;
 826                                                 char *field_value;
 827                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 828                                                 if (field_name == NULL) {
 829                                                         break;
 830                                                 }
 831                                                 if ((strcmp(field_name, "Priority") == 0) ||
 832                                                         (strcmp(field_name, "Section") == 0)) {
 833                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 834                                                 }
 835                                         }
 836                                         write_flag = TRUE;
 837                                         fputs("\n", new_status_file);
 838                                 }
 839                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 840                                         /* only change the status line */
 841                                         while (1) {
 842                                                 char *field_name;
 843                                                 char *field_value;
 844                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 845                                                 if (field_name == NULL) {
 846                                                         break;
 847                                                 }
 848                                                 /* Setup start point for next field */
 849                                                 if (strcmp(field_name, "Status") == 0) {
 850                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 851                                                 } else {
 852                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 853                                                 }
 854                                         }
 855                                         write_flag = TRUE;
 856                                         fputs("\n", new_status_file);
 857                                 }
 858                         }
 859                 }
 860                 /* If the package from the status file wasnt handle above, do it now*/
 861                 if (! write_flag) {
 862                         fprintf(new_status_file, "%s\n\n", control_buffer);
 863                 }
 864
 865                 if (status_from_file != NULL) {
 866                         free(status_from_file);
 867                 }
 868                 free(package_name);
 869                 free(control_buffer);
 870         }
 871
 872         /* Write any new packages */
 873         for(i = 0; deb_file[i] != NULL; i++) {
 874                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 875                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 876                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 877                         set_status(status_num, "ok", 2);
 878                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 879                 }
 880         }
 881         fclose(old_status_file);
 882         fclose(new_status_file);
 883
 884
 885         /* Create a seperate backfile to dpkg */
 886         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 887                 struct stat stat_buf;
 888                 if (stat("/var/lib/dpkg/status", &stat_buf) == 0) {
 889                         error_msg_and_die("Couldnt create backup status file");
 890                 }
 891                 /* Its ok if renaming the status file fails becasue status
 892                  * file doesnt exist, maybe we are starting from scratch */
 893                 error_msg("No status file found, creating new one");
 894         }
 895
 896         if (rename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status") == -1) {
 897                 error_msg_and_die("DANGER: Couldnt create status file, you need to manually repair your status file");
 898         }
 899 }
 900
 901 int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
 902 {
 903         int *conflicts = NULL;
 904         int conflicts_num = 0;
 905         int state_status;
 906         int state_flag;
 907         int state_want;
 908         unsigned int status_package_num;
 909         int i = deb_start;
 910         int j, k;
 911
 912         /* Check for conflicts
 913          * TODO: TEST if conflicts with other packages to be installed
 914          *
 915          * Add install packages and the packages they provide
 916          * to the list of files to check conflicts for
 917          */
 918
 919         /* Create array of package numbers to check against
 920          * installed package for conflicts*/
 921         while (deb_file[i] != NULL) {
 922                 const unsigned int package_num = deb_file[i]->package;
 923                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
 924                 conflicts[conflicts_num] = package_num;
 925                 conflicts_num++;
 926                 /* add provides to conflicts list */
 927                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
 928                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
 929                                 const int conflicts_package_num = search_package_hashtable(
 930                                         package_hashtable[package_num]->edge[j]->name,
 931                                         package_hashtable[package_num]->edge[j]->version,
 932                                         package_hashtable[package_num]->edge[j]->operator);
 933                                 if (package_hashtable[conflicts_package_num] == NULL) {
 934                                         /* create a new package */
 935                                         common_node_t *new_node = (common_node_t *) xmalloc(sizeof(common_node_t));
 936                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
 937                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
 938                                         new_node->num_of_edges = 0;
 939                                         new_node->edge = NULL;
 940                                         package_hashtable[conflicts_package_num] = new_node;
 941                                 }
 942                                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
 943                                 conflicts[conflicts_num] = conflicts_package_num;
 944                                 conflicts_num++;
 945                         }
 946                 }
 947                 i++;
 948         }
 949
 950         /* Check conflicts */
 951         for (i = 0; i < conflicts_num; i++) {
 952                 /* Check for conflicts */
 953                 for (j = 0; j < STATUS_HASH_PRIME; j++) {
 954                         if (status_hashtable[j] == NULL) {
 955                                 continue;
 956                         }
 957                         state_flag = get_status(j, 2);
 958                         state_status = get_status(j, 3);
 959                         if ((state_status != search_name_hashtable("installed"))
 960                                 && (state_flag != search_name_hashtable("want-install"))) {
 961                                 continue;
 962                         }
 963                         status_package_num = status_hashtable[j]->package;
 964                         for (k = 0; k < package_hashtable[status_package_num]->num_of_edges; k++) {
 965                                 const edge_t *package_edge = package_hashtable[status_package_num]->edge[k];
 966                                 if (package_edge->type != EDGE_CONFLICTS) {
 967                                         continue;
 968                                 }
 969                                 if (package_edge->name != package_hashtable[conflicts[i]]->name) {
 970                                         continue;
 971                                 }
 972                                 /* There is a conflict against the package name
 973                                  * check if version conflict as well */
 974                                 if (test_version(package_hashtable[deb_file[i]->package]->version,
 975                                                 package_edge->version, package_edge->operator)) {
 976                                         error_msg_and_die("Package %s conflict with %s",
 977                                                 name_hashtable[package_hashtable[deb_file[i]->package]->name],
 978                                                 name_hashtable[package_hashtable[status_package_num]->name]);
 979                                 }
 980                         }
 981                 }
 982         }
 983
 984         /* Check dependendcies */
 985         i = 0;
 986         while (deb_file[i] != NULL) {
 987                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
 988                 int status_num = 0;
 989
 990                 for (j = 0; j < package_hashtable[deb_file[i]->package]->num_of_edges; j++) {
 991                         const edge_t *package_edge = package_node->edge[j];
 992                         unsigned int package_num;
 993
 994                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
 995                         if (package_hashtable[package_num] == NULL) {
 996                                 error_msg_and_die("Dependency checking failed for package %s\nNOTE: This may be due to busybox dpkg's inability to handle the Provides field, you may avoid dependency checking using the \"-F depends\" option ", name_hashtable[package_edge->name]);
 997                         }
 998                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
 999
1000                         state_status = get_status(status_num, 3);
1001                         state_want = get_status(status_num, 1);
1002                         switch (package_edge->type) {
1003                                 case(EDGE_PRE_DEPENDS):
1004                                 case(EDGE_OR_PRE_DEPENDS):
1005                                         /* It must be already installed */
1006                                         /* NOTE: This is untested, nothing apropriate in my status file */
1007                                         if ((package_hashtable[package_num] == NULL) || (state_status != search_name_hashtable("installed"))) {
1008                                                 error_msg_and_die("Package %s pre-depends on %s, but it is not installed",
1009                                                         name_hashtable[package_node->name],
1010                                                         name_hashtable[package_edge->name]);
1011                                         }
1012                                         break;
1013                                 case(EDGE_DEPENDS):
1014                                 case(EDGE_OR_DEPENDS):
1015                                         /* It must be already installed, or to be installed */
1016                                         if ((package_hashtable[package_num] == NULL) ||
1017                                                 ((state_status != search_name_hashtable("installed")) &&
1018                                                 (state_want != search_name_hashtable("want_install")))) {
1019                                                 error_msg_and_die("Package %s depends on %s, but it is not installed, or flaged to be installed",
1020                                                         name_hashtable[package_node->name],
1021                                                         name_hashtable[package_edge->name]);
1022                                         }
1023                                         break;
1024                         }
1025                 }
1026                 i++;
1027         }
1028         free(conflicts);
1029         return(TRUE);
1030 }
1031
1032 char **create_list(const char *filename)
1033 {
1034         FILE *list_stream;
1035         char **file_list = xmalloc(sizeof(char *));
1036         char *line = NULL;
1037         int length = 0;
1038         int count = 0;
1039
1040         /* dont use [xw]fopen here, handle error ourself */
1041         list_stream = fopen(filename, "r");
1042         if (list_stream == NULL) {
1043                 *file_list = NULL;
1044                 return(file_list);
1045         }
1046         while (getline(&line, &length, list_stream) != -1) {
1047                 /* +2 as we need to include space for the terminating NULL pointer */
1048                 file_list = xrealloc(file_list, sizeof(char *) * (length + 2));
1049                 chomp(line);
1050                 file_list[count] = xstrdup(line);
1051                 count++;
1052         }
1053         fclose(list_stream);
1054         free(line);
1055
1056         if (count == 0) {
1057                 return(NULL);
1058         } else {
1059                 file_list[count] = NULL;
1060                 return(file_list);
1061         }
1062 }
1063
1064 /* maybe i should try and hook this into remove_file.c somehow */
1065 int remove_file_array(char **remove_names, char **exclude_names)
1066 {
1067         struct stat path_stat;
1068         int match_flag;
1069         int remove_flag = FALSE;
1070         int i,j;
1071
1072         if (remove_names == NULL) {
1073                 return(FALSE);
1074         }
1075         for (i = 0; remove_names[i] != NULL; i++) {
1076                 match_flag = FALSE;
1077                 if (exclude_names != NULL) {
1078                         for (j = 0; exclude_names[j] != 0; j++) {
1079                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1080                                         match_flag = TRUE;
1081                                         break;
1082                                 }
1083                         }
1084                 }
1085                 if (!match_flag) {
1086                         if (lstat(remove_names[i], &path_stat) < 0) {
1087                                 continue;
1088                         }
1089                         if (S_ISDIR(path_stat.st_mode)) {
1090                                 if (rmdir(remove_names[i]) != -1) {
1091                                         remove_flag = TRUE;
1092                                 }
1093                         } else {
1094                                 if (unlink(remove_names[i]) != -1) {
1095                                         remove_flag = TRUE;
1096                                 }
1097                         }
1098                 }
1099         }
1100         return(remove_flag);
1101 }
1102
1103 int run_package_script(const char *package_name, const char *script_type)
1104 {
1105         struct stat path_stat;
1106         char *script_path;
1107         int result;
1108
1109         script_path = xmalloc(strlen(package_name) + strlen(script_type) + 21);
1110         sprintf(script_path, "/var/lib/dpkg/info/%s.%s", package_name, script_type);
1111
1112         /* If the file doesnt exist is isnt a fatal */
1113         if (lstat(script_path, &path_stat) < 0) {
1114                 result = EXIT_SUCCESS;
1115         } else {
1116                 result = system(script_path);
1117         }
1118         free(script_path);
1119         return(result);
1120 }
1121
1122 void all_control_list(char **remove_files, const char *package_name)
1123 {
1124         const char *all_extensions[11] = {"preinst", "postinst", "prerm", "postrm",
1125                 "list", "md5sums", "shlibs", "conffiles", "config", "templates", NULL };
1126         int i;
1127
1128         /* Create a list of all /var/lib/dpkg/info/<package> files */
1129         for(i = 0; i < 10; i++) {
1130                 remove_files[i] = xmalloc(strlen(package_name) + strlen(all_extensions[i]) + 21);
1131                 sprintf(remove_files[i], "/var/lib/dpkg/info/%s.%s", package_name, all_extensions[i]);
1132         }
1133         remove_files[10] = NULL;
1134 }
1135
1136
1137 /* This function lists information on the installed packages. It loops through
1138  * the status_hashtable to retrieve the info. This results in smaller code than
1139  * scanning the status file. The resulting list, however, is unsorted.
1140  */
1141 void list_packages(void)
1142 {
1143         int i;
1144
1145         printf("    Name           Version\n");
1146         printf("+++-==============-==============\n");
1147
1148         /* go through status hash, dereference package hash and finally strings */
1149         for (i=0; i<STATUS_HASH_PRIME+1; i++) {
1150
1151                 if (status_hashtable[i]) {
1152                         const char *stat_str;  /* status string */
1153                         const char *name_str;  /* package name */
1154                         const char *vers_str;  /* version */
1155                         char  s1, s2;          /* status abbreviations */
1156                         int   spccnt;          /* space count */
1157                         int   j;
1158
1159                         stat_str = name_hashtable[status_hashtable[i]->status];
1160                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1161                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1162
1163                         /* get abbreviation for status field 1 */
1164                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1165
1166                         /* get abbreviation for status field 2 */
1167                         for (j=0, spccnt=0; stat_str[j] && spccnt<2; j++) {
1168                                 if (stat_str[j] == ' ') spccnt++;
1169                         }
1170                         s2 = stat_str[j];
1171
1172                         /* print out the line formatted like Debian dpkg */
1173                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1174                 }
1175     }
1176 }
1177
1178 void remove_package(const unsigned int package_num)
1179 {
1180         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1181         const unsigned int status_num = search_status_hashtable(package_name);
1182         const int package_name_length = strlen(package_name);
1183         char **remove_files;
1184         char **exclude_files;
1185         char list_name[package_name_length + 25];
1186         char conffile_name[package_name_length + 30];
1187         int return_value;
1188
1189         printf("Removing %s ...\n", package_name);
1190
1191         /* run prerm script */
1192         return_value = run_package_script(package_name, "prerm");
1193         if (return_value == -1) {
1194                 error_msg_and_die("script failed, prerm failure");
1195         }
1196
1197         /* Create a list of files to remove, and a seperate list of those to keep */
1198         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1199         remove_files = create_list(list_name);
1200
1201         sprintf(conffile_name, "/var/lib/dpkg/info/%s.conffiles", package_name);
1202         exclude_files = create_list(conffile_name);
1203
1204         /* Some directories cant be removed straight away, so do multiple passes */
1205         while (remove_file_array(remove_files, exclude_files));
1206
1207         /* Create a list of all /var/lib/dpkg/info/<package> files */
1208         remove_files = xmalloc(sizeof(char *) * 11);
1209         all_control_list(remove_files, package_name);
1210
1211         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep  */
1212         exclude_files = xmalloc(sizeof(char*) * 3);
1213         exclude_files[0] = xstrdup(conffile_name);
1214         exclude_files[1] = xmalloc(package_name_length + 27);
1215         sprintf(exclude_files[1], "/var/lib/dpkg/info/%s.postrm", package_name);
1216         exclude_files[2] = NULL;
1217
1218         remove_file_array(remove_files, exclude_files);
1219
1220         /* rename <package>.conffile to <package>.list */
1221         rename(conffile_name, list_name);
1222
1223         /* Change package status */
1224         set_status(status_num, "deinstall", 1);
1225         set_status(status_num, "config-files", 3);
1226 }
1227
1228 void purge_package(const unsigned int package_num)
1229 {
1230         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1231         const unsigned int status_num = search_status_hashtable(package_name);
1232         char **remove_files;
1233         char **exclude_files;
1234         char list_name[strlen(package_name) + 25];
1235
1236         /* run prerm script */
1237         if (run_package_script(package_name, "prerm") != 0) {
1238                 error_msg_and_die("script failed, prerm failure");
1239         }
1240
1241         /* Create a list of files to remove */
1242         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1243         remove_files = create_list(list_name);
1244
1245         exclude_files = xmalloc(1);
1246         exclude_files[0] = NULL;
1247
1248         /* Some directories cant be removed straight away, so do multiple passes */
1249         while (remove_file_array(remove_files, exclude_files));
1250
1251         /* Create a list of all /var/lib/dpkg/info/<package> files */
1252         remove_files = xmalloc(sizeof(char *) * 11);
1253         all_control_list(remove_files, package_name);
1254         remove_file_array(remove_files, exclude_files);
1255
1256         /* run postrm script */
1257         if (run_package_script(package_name, "postrm") == -1) {
1258                 error_msg_and_die("postrm fialure.. set status to what?");
1259         }
1260
1261         /* Change package status */
1262         set_status(status_num, "purge", 1);
1263         set_status(status_num, "not-installed", 3);
1264 }
1265
1266 void unpack_package(deb_file_t *deb_file)
1267 {
1268         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1269         const unsigned int status_num = search_status_hashtable(package_name);
1270         const unsigned int status_package_num = status_hashtable[status_num]->package;
1271
1272         FILE *out_stream;
1273         char *info_prefix;
1274
1275         /* If existing version, remove it first */
1276         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1277                 /* Package is already installed, remove old version first */
1278                 printf("Preparing to replace %s %s (using %s) ...\n", package_name,
1279                         name_hashtable[package_hashtable[status_package_num]->version],
1280                         deb_file->filename);
1281                 remove_package(status_package_num);
1282         } else {
1283                 printf("Unpacking %s (from %s) ...\n", package_name, deb_file->filename);
1284         }
1285
1286         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1287         info_prefix = (char *) xmalloc(sizeof(package_name) + 20 + 4 + 2);
1288         sprintf(info_prefix, "/var/lib/dpkg/info/%s.", package_name);
1289         deb_extract(deb_file->filename, stdout, (extract_quiet | extract_control_tar_gz | extract_all_to_fs | extract_unconditional), info_prefix, NULL);
1290
1291         /* Run the preinst prior to extracting */
1292         if (run_package_script(package_name, "preinst") != 0) {
1293                 /* when preinst returns exit code != 0 then quit installation process */
1294                 error_msg_and_die("subprocess pre-installation script returned error.");
1295         }
1296
1297         /* Extract data.tar.gz to the root directory */
1298         deb_extract(deb_file->filename, stdout, (extract_quiet | extract_data_tar_gz | extract_all_to_fs | extract_unconditional), "/", NULL);
1299
1300         /* Create the list file */
1301         strcat(info_prefix, "list");
1302         out_stream = xfopen(info_prefix, "w");
1303         deb_extract(deb_file->filename, out_stream, (extract_quiet | extract_data_tar_gz | extract_list), "/", NULL);
1304         fclose(out_stream);
1305
1306         /* change status */
1307         set_status(status_num, "install", 1);
1308         set_status(status_num, "unpacked", 3);
1309
1310         free(info_prefix);
1311 }
1312
1313 void configure_package(deb_file_t *deb_file)
1314 {
1315         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1316         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1317         const int status_num = search_status_hashtable(package_name);
1318
1319         printf("Setting up %s (%s)\n", package_name, package_version);
1320
1321         /* Run the postinst script */
1322         if (run_package_script(package_name, "postinst") != 0) {
1323                 /* TODO: handle failure gracefully */
1324                 error_msg_and_die("postrm failure.. set status to what?");
1325         }
1326         /* Change status to reflect success */
1327         set_status(status_num, "install", 1);
1328         set_status(status_num, "installed", 3);
1329 }
1330
1331 extern int dpkg_main(int argc, char **argv)
1332 {
1333         deb_file_t **deb_file = NULL;
1334         status_node_t *status_node;
1335         int opt;
1336         int package_num;
1337         int dpkg_opt = 0;
1338         int deb_count = 0;
1339         int state_status;
1340         int status_num;
1341         int i;
1342
1343         while ((opt = getopt(argc, argv, "CF:ilPru")) != -1) {
1344                 switch (opt) {
1345                         case 'C': // equivalent to --configure in official dpkg
1346                                 dpkg_opt |= dpkg_opt_configure;
1347                                 dpkg_opt |= dpkg_opt_package_name;
1348                                 break;
1349                         case 'F': // equivalent to --force in official dpkg
1350                                 if (strcmp(optarg, "depends") == 0) {
1351                                         dpkg_opt |= dpkg_opt_force_ignore_depends;
1352                                 }
1353                         case 'i':
1354                                 dpkg_opt |= dpkg_opt_install;
1355                                 dpkg_opt |= dpkg_opt_filename;
1356                                 break;
1357                         case 'l':
1358                                 dpkg_opt |= dpkg_opt_list_installed;
1359                                 break;
1360                         case 'P':
1361                                 dpkg_opt |= dpkg_opt_purge;
1362                                 dpkg_opt |= dpkg_opt_package_name;
1363                                 break;
1364                         case 'r':
1365                                 dpkg_opt |= dpkg_opt_remove;
1366                                 dpkg_opt |= dpkg_opt_package_name;
1367                                 break;
1368                         case 'u':       /* Equivalent to --unpack in official dpkg */
1369                                 dpkg_opt |= dpkg_opt_unpack;
1370                                 dpkg_opt |= dpkg_opt_filename;
1371                                 break;
1372                         default:
1373                                 show_usage();
1374                 }
1375         }
1376         /* check for non-otion argument if expected  */
1377         if ((dpkg_opt == 0) || ((argc == optind) && !(dpkg_opt && dpkg_opt_list_installed))) {
1378                 show_usage();
1379         }
1380
1381 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1382         index_status_file("/var/lib/dpkg/status");
1383
1384         /* if the list action was given print the installed packages and exit */
1385         if (dpkg_opt & dpkg_opt_list_installed) {
1386                 list_packages();
1387                 return(EXIT_SUCCESS);
1388         }
1389
1390         /* Read arguments and store relevant info in structs */
1391         deb_file = xmalloc(sizeof(deb_file_t));
1392         while (optind < argc) {
1393                 deb_file[deb_count] = (deb_file_t *) xmalloc(sizeof(deb_file_t));
1394                 if (dpkg_opt & dpkg_opt_filename) {
1395                         deb_file[deb_count]->filename = xstrdup(argv[optind]);
1396                         deb_file[deb_count]->control_file = deb_extract(argv[optind], stdout, (extract_control_tar_gz | extract_one_to_buffer), NULL, "./control");
1397                         if (deb_file[deb_count]->control_file == NULL) {
1398                                 error_msg_and_die("Couldnt extract control file");
1399                         }
1400                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1401
1402                         if (package_num == -1) {
1403                                 error_msg("Invalid control file in %s", argv[optind]);
1404                                 continue;
1405                         }
1406                         deb_file[deb_count]->package = (unsigned int) package_num;
1407                         /* Add the package to the status hashtable */
1408                         if ((dpkg_opt & dpkg_opt_unpack) || (dpkg_opt & dpkg_opt_install)) {
1409                                 status_node = (status_node_t *) xmalloc(sizeof(status_node_t));
1410                                 status_node->package = deb_file[deb_count]->package;
1411
1412                                 /* Try and find a currently installed version of this package */
1413                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1414                                 /* If no previous entry was found initialise a new entry */
1415                                 if ((status_hashtable[status_num] == NULL) ||
1416                                         (status_hashtable[status_num]->status == 0)) {
1417                                         /* reinstreq isnt changed to "ok" until the package control info
1418                                          * is written to the status file*/
1419                                         status_node->status = search_name_hashtable("install reinstreq not-installed");
1420                                         status_hashtable[status_num] = status_node;
1421                                 } else {
1422                                         status_hashtable[status_num]->status = search_name_hashtable("install reinstreq installed");
1423                                 }
1424                         }
1425                 }
1426                 else if (dpkg_opt & dpkg_opt_package_name) {
1427                         deb_file[deb_count]->filename = NULL;
1428                         deb_file[deb_count]->control_file = NULL;
1429                         deb_file[deb_count]->package = search_package_hashtable(
1430                                 search_name_hashtable(argv[optind]),
1431                                 search_name_hashtable("ANY"), VER_ANY);
1432                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1433                                 error_msg_and_die("Package %s is uninstalled or unknown\n", argv[optind]);
1434                         }
1435                         state_status = get_status(search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]), 3);
1436
1437                         /* check package status is "installed" */
1438                         if (dpkg_opt & dpkg_opt_remove) {
1439                                 if ((strcmp(name_hashtable[state_status], "not-installed") == 0) ||
1440                                         (strcmp(name_hashtable[state_status], "config-files") == 0)) {
1441                                         error_msg_and_die("%s is already removed.", name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1442                                 }
1443                         }
1444                         else if (dpkg_opt & dpkg_opt_purge) {
1445                                 /* if package status is "conf-files" then its ok */
1446                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1447                                         error_msg_and_die("%s is already purged.", name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1448                                 }
1449                         }
1450                 }
1451                 deb_count++;
1452                 optind++;
1453         }
1454         deb_file[deb_count] = NULL;
1455
1456         /* Check that the deb file arguments are installable */
1457         /* TODO: check dependencies before removing */
1458         if ((dpkg_opt & dpkg_opt_force_ignore_depends) != dpkg_opt_force_ignore_depends) {
1459                 if (!check_deps(deb_file, 0, deb_count)) {
1460                         error_msg_and_die("Dependency check failed");
1461                 }
1462         }
1463
1464         for (i = 0; i < deb_count; i++) {
1465                 /* Remove or purge packages */
1466                 if (dpkg_opt & dpkg_opt_remove) {
1467                         remove_package(deb_file[i]->package);
1468                 }
1469                 else if (dpkg_opt & dpkg_opt_purge) {
1470                         purge_package(deb_file[i]->package);
1471                 }
1472                 else if (dpkg_opt & dpkg_opt_unpack) {
1473                         unpack_package(deb_file[i]);
1474                 }
1475                 else if (dpkg_opt & dpkg_opt_install) {
1476                         unpack_package(deb_file[i]);
1477                         configure_package(deb_file[i]);
1478                 }
1479                 else if (dpkg_opt & dpkg_opt_configure) {
1480                         configure_package(deb_file[i]);
1481                 }
1482         }
1483
1484         write_status_file(deb_file);
1485
1486         for (i = 0; i < deb_count; i++) {
1487                 free(deb_file[i]->control_file);
1488                 free(deb_file[i]->filename);
1489                 free(deb_file[i]);
1490         }
1491         free(deb_file);
1492
1493         for (i = 0; i < NAME_HASH_PRIME; i++) {
1494                 if (name_hashtable[i] != NULL) {
1495                         free(name_hashtable[i]);
1496                 }
1497         }
1498
1499         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1500                 free_package(package_hashtable[i]);
1501         }
1502
1503         for (i = 0; i < STATUS_HASH_PRIME; i++) {
1504                 if (status_hashtable[i] != NULL) {
1505                         free(status_hashtable[i]);
1506                 }
1507         }
1508
1509         return(EXIT_SUCCESS);
1510 }
1511