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 <fcntl.h>
  42 #include <getopt.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include "unarchive.h"
  47 #include "busybox.h"
  48
  49 /* NOTE: If you vary HASH_PRIME sizes be aware,
  50  * 1) Tweaking these will have a big effect on how much memory this program uses.
  51  * 2) For computational efficiency these hash tables should be at least 20%
  52  *    larger than the maximum number of elements stored in it.
  53  * 3) All _HASH_PRIME's must be a prime number or chaos is assured, if your looking
  54  *    for a prime, try http://www.utm.edu/research/primes/lists/small/10000.txt
  55  * 4) If you go bigger than 15 bits you may get into trouble (untested) as its
  56  *    sometimes cast to an unsigned int, if you go to 16 bit you will overlap
  57  *    int's and chaos is assured, 16381 is the max prime for 14 bit field
  58  */
  59
  60 /* NAME_HASH_PRIME, Stores package names and versions,
  61  * I estimate it should be at least 50% bigger than PACKAGE_HASH_PRIME,
  62  * as there a lot of duplicate version numbers */
  63 #define NAME_HASH_PRIME 16381
  64 char *name_hashtable[NAME_HASH_PRIME + 1];
  65
  66 /* PACKAGE_HASH_PRIME, Maximum number of unique packages,
  67  * It must not be smaller than STATUS_HASH_PRIME,
  68  * Currently only packages from status_hashtable are stored in here, but in
  69  * future this may be used to store packages not only from a status file,
  70  * but an available_hashtable, and even multiple packages files.
  71  * Package can be stored more than once if they have different versions.
  72  * e.g. The same package may have different versions in the status file
  73  *      and available file */
  74 #define PACKAGE_HASH_PRIME 10007
  75 typedef struct edge_s {
  76         unsigned int operator:3;
  77         unsigned int type:4;
  78         unsigned int name:14;
  79         unsigned int version:14;
  80 } edge_t;
  81
  82 typedef struct common_node_s {
  83         unsigned int name:14;
  84         unsigned int version:14;
  85         unsigned int num_of_edges:14;
  86         edge_t **edge;
  87 } common_node_t;
  88 common_node_t *package_hashtable[PACKAGE_HASH_PRIME + 1];
  89
  90 /* Currently it doesnt store packages that have state-status of not-installed
  91  * So it only really has to be the size of the maximum number of packages
  92  * likely to be installed at any one time, so there is a bit of leaway here */
  93 #define STATUS_HASH_PRIME 8191
  94 typedef struct status_node_s {
  95         unsigned int package:14;        /* has to fit PACKAGE_HASH_PRIME */
  96         unsigned int status:14;         /* has to fit STATUS_HASH_PRIME */
  97 } status_node_t;
  98 status_node_t *status_hashtable[STATUS_HASH_PRIME + 1];
  99
 100 /* Even numbers are for 'extras', like ored dependecies or null */
 101 enum edge_type_e {
 102         EDGE_NULL = 0,
 103         EDGE_PRE_DEPENDS = 1,
 104         EDGE_OR_PRE_DEPENDS = 2,
 105         EDGE_DEPENDS = 3,
 106         EDGE_OR_DEPENDS = 4,
 107         EDGE_REPLACES = 5,
 108         EDGE_PROVIDES = 7,
 109         EDGE_CONFLICTS = 9,
 110         EDGE_SUGGESTS = 11,
 111         EDGE_RECOMMENDS = 13,
 112         EDGE_ENHANCES = 15
 113 };
 114 enum operator_e {
 115         VER_NULL = 0,
 116         VER_EQUAL = 1,
 117         VER_LESS = 2,
 118         VER_LESS_EQUAL = 3,
 119         VER_MORE = 4,
 120         VER_MORE_EQUAL = 5,
 121         VER_ANY = 6
 122 };
 123
 124 enum dpkg_opt_e {
 125         dpkg_opt_purge = 1,
 126         dpkg_opt_remove = 2,
 127         dpkg_opt_unpack = 4,
 128         dpkg_opt_configure = 8,
 129         dpkg_opt_install = 16,
 130         dpkg_opt_package_name = 32,
 131         dpkg_opt_filename = 64,
 132         dpkg_opt_list_installed = 128,
 133         dpkg_opt_force_ignore_depends = 256
 134 };
 135
 136 typedef struct deb_file_s {
 137         char *control_file;
 138         char *filename;
 139         unsigned int package:14;
 140 } deb_file_t;
 141
 142
 143 void make_hash(const char *key, unsigned int *start, unsigned int *decrement, const int hash_prime)
 144 {
 145         unsigned long int hash_num = key[0];
 146         int len = strlen(key);
 147         int i;
 148
 149         /* Maybe i should have uses a "proper" hashing algorithm here instead
 150          * of making one up myself, seems to be working ok though. */
 151         for(i = 1; i < len; i++) {
 152                 /* shifts the ascii based value and adds it to previous value
 153                  * shift amount is mod 24 because long int is 32 bit and data
 154                  * to be shifted is 8, dont want to shift data to where it has
 155                  * no effect*/
 156                 hash_num += ((key[i] + key[i-1]) << ((key[i] * i) % 24));
 157         }
 158         *start = (unsigned int) hash_num % hash_prime;
 159         *decrement = (unsigned int) 1 + (hash_num % (hash_prime - 1));
 160 }
 161
 162 /* this adds the key to the hash table */
 163 int search_name_hashtable(const char *key)
 164 {
 165         unsigned int probe_address = 0;
 166         unsigned int probe_decrement = 0;
 167 //      char *temp;
 168
 169         make_hash(key, &probe_address, &probe_decrement, NAME_HASH_PRIME);
 170         while(name_hashtable[probe_address] != NULL) {
 171                 if (strcmp(name_hashtable[probe_address], key) == 0) {
 172                         return(probe_address);
 173                 } else {
 174                         probe_address -= probe_decrement;
 175                         if ((int)probe_address < 0) {
 176                                 probe_address += NAME_HASH_PRIME;
 177                         }
 178                 }
 179         }
 180         name_hashtable[probe_address] = xstrdup(key);
 181         return(probe_address);
 182 }
 183
 184 /* this DOESNT add the key to the hashtable
 185  * TODO make it consistent with search_name_hashtable
 186  */
 187 unsigned int search_status_hashtable(const char *key)
 188 {
 189         unsigned int probe_address = 0;
 190         unsigned int probe_decrement = 0;
 191
 192         make_hash(key, &probe_address, &probe_decrement, STATUS_HASH_PRIME);
 193         while(status_hashtable[probe_address] != NULL) {
 194                 if (strcmp(key, name_hashtable[package_hashtable[status_hashtable[probe_address]->package]->name]) == 0) {
 195                         break;
 196                 } else {
 197                         probe_address -= probe_decrement;
 198                         if ((int)probe_address < 0) {
 199                                 probe_address += STATUS_HASH_PRIME;
 200                         }
 201                 }
 202         }
 203         return(probe_address);
 204 }
 205
 206 /* Need to rethink version comparison, maybe the official dpkg has something i can use ? */
 207 int version_compare_part(const char *version1, const char *version2)
 208 {
 209         int upstream_len1 = 0;
 210         int upstream_len2 = 0;
 211         char *name1_char;
 212         char *name2_char;
 213         int len1 = 0;
 214         int len2 = 0;
 215         int tmp_int;
 216         int ver_num1;
 217         int ver_num2;
 218         int ret;
 219
 220         if (version1 == NULL) {
 221                 version1 = xstrdup("");
 222         }
 223         if (version2 == NULL) {
 224                 version2 = xstrdup("");
 225         }
 226         upstream_len1 = strlen(version1);
 227         upstream_len2 = strlen(version2);
 228
 229         while ((len1 < upstream_len1) || (len2 < upstream_len2)) {
 230                 /* Compare non-digit section */
 231                 tmp_int = strcspn(&version1[len1], "0123456789");
 232                 name1_char = xstrndup(&version1[len1], tmp_int);
 233                 len1 += tmp_int;
 234                 tmp_int = strcspn(&version2[len2], "0123456789");
 235                 name2_char = xstrndup(&version2[len2], tmp_int);
 236                 len2 += tmp_int;
 237                 tmp_int = strcmp(name1_char, name2_char);
 238                 free(name1_char);
 239                 free(name2_char);
 240                 if (tmp_int != 0) {
 241                         ret = tmp_int;
 242                         goto cleanup_version_compare_part;
 243                 }
 244
 245                 /* Compare digits */
 246                 tmp_int = strspn(&version1[len1], "0123456789");
 247                 name1_char = xstrndup(&version1[len1], tmp_int);
 248                 len1 += tmp_int;
 249                 tmp_int = strspn(&version2[len2], "0123456789");
 250                 name2_char = xstrndup(&version2[len2], tmp_int);
 251                 len2 += tmp_int;
 252                 ver_num1 = atoi(name1_char);
 253                 ver_num2 = atoi(name2_char);
 254                 free(name1_char);
 255                 free(name2_char);
 256                 if (ver_num1 < ver_num2) {
 257                         ret = -1;
 258                         goto cleanup_version_compare_part;
 259                 }
 260                 else if (ver_num1 > ver_num2) {
 261                         ret = 1;
 262                         goto cleanup_version_compare_part;
 263                 }
 264         }
 265         ret = 0;
 266 cleanup_version_compare_part:
 267         return(ret);
 268 }
 269
 270 /* if ver1 < ver2 return -1,
 271  * if ver1 = ver2 return 0,
 272  * if ver1 > ver2 return 1,
 273  */
 274 int version_compare(const unsigned int ver1, const unsigned int ver2)
 275 {
 276         char *ch_ver1 = name_hashtable[ver1];
 277         char *ch_ver2 = name_hashtable[ver2];
 278
 279         char epoch1, epoch2;
 280         char *deb_ver1, *deb_ver2;
 281         char *ver1_ptr, *ver2_ptr;
 282         char *upstream_ver1;
 283         char *upstream_ver2;
 284         int result;
 285
 286         /* Compare epoch */
 287         if (ch_ver1[1] == ':') {
 288                 epoch1 = ch_ver1[0];
 289                 ver1_ptr = strchr(ch_ver1, ':') + 1;
 290         } else {
 291                 epoch1 = '0';
 292                 ver1_ptr = ch_ver1;
 293         }
 294         if (ch_ver2[1] == ':') {
 295                 epoch2 = ch_ver2[0];
 296                 ver2_ptr = strchr(ch_ver2, ':') + 1;
 297         } else {
 298                 epoch2 = '0';
 299                 ver2_ptr = ch_ver2;
 300         }
 301         if (epoch1 < epoch2) {
 302                 return(-1);
 303         }
 304         else if (epoch1 > epoch2) {
 305                 return(1);
 306         }
 307
 308         /* Compare upstream version */
 309         upstream_ver1 = xstrdup(ver1_ptr);
 310         upstream_ver2 = xstrdup(ver2_ptr);
 311
 312         /* Chop off debian version, and store for later use */
 313         deb_ver1 = strrchr(upstream_ver1, '-');
 314         deb_ver2 = strrchr(upstream_ver2, '-');
 315         if (deb_ver1) {
 316                 deb_ver1[0] = '\0';
 317                 deb_ver1++;
 318         }
 319         if (deb_ver2) {
 320                 deb_ver2[0] = '\0';
 321                 deb_ver2++;
 322         }
 323         result = version_compare_part(upstream_ver1, upstream_ver2);
 324
 325         free(upstream_ver1);
 326         free(upstream_ver2);
 327
 328         if (result != 0) {
 329                 return(result);
 330         }
 331
 332         /* Compare debian versions */
 333         return(version_compare_part(deb_ver1, deb_ver2));
 334 }
 335
 336 int test_version(const unsigned int version1, const unsigned int version2, const unsigned int operator)
 337 {
 338         const int version_result = version_compare(version1, version2);
 339         switch(operator) {
 340                 case (VER_ANY):
 341                         return(TRUE);
 342                 case (VER_EQUAL):
 343                         if (version_result == 0) {
 344                                 return(TRUE);
 345                         }
 346                         break;
 347                 case (VER_LESS):
 348                         if (version_result < 0) {
 349                                 return(TRUE);
 350                         }
 351                         break;
 352                 case (VER_LESS_EQUAL):
 353                         if (version_result <= 0) {
 354                                 return(TRUE);
 355                         }
 356                         break;
 357                 case (VER_MORE):
 358                         if (version_result > 0) {
 359                                 return(TRUE);
 360                         }
 361                         break;
 362                 case (VER_MORE_EQUAL):
 363                         if (version_result >= 0) {
 364                                 return(TRUE);
 365                         }
 366                         break;
 367         }
 368         return(FALSE);
 369 }
 370
 371
 372 int search_package_hashtable(const unsigned int name, const unsigned int version, const unsigned int operator)
 373 {
 374         unsigned int probe_address = 0;
 375         unsigned int probe_decrement = 0;
 376
 377         make_hash(name_hashtable[name], &probe_address, &probe_decrement, PACKAGE_HASH_PRIME);
 378         while(package_hashtable[probe_address] != NULL) {
 379                 if (package_hashtable[probe_address]->name == name) {
 380                         if (operator == VER_ANY) {
 381                                 return(probe_address);
 382                         }
 383                         if (test_version(package_hashtable[probe_address]->version, version, operator)) {
 384                                 return(probe_address);
 385                         }
 386                 }
 387                 probe_address -= probe_decrement;
 388                 if ((int)probe_address < 0) {
 389                         probe_address += PACKAGE_HASH_PRIME;
 390                 }
 391         }
 392         return(probe_address);
 393 }
 394
 395 /*
 396  * Create one new node and one new edge for every dependency.
 397  */
 398 void add_split_dependencies(common_node_t *parent_node, const char *whole_line, unsigned int edge_type)
 399 {
 400         char *line = xstrdup(whole_line);
 401         char *line2;
 402         char *line_ptr1 = NULL;
 403         char *line_ptr2 = NULL;
 404         char *field;
 405         char *field2;
 406         char *version;
 407         edge_t *edge;
 408         int offset_ch;
 409         int type;
 410
 411         field = strtok_r(line, ",", &line_ptr1);
 412         do {
 413                 line2 = xstrdup(field);
 414                 field2 = strtok_r(line2, "|", &line_ptr2);
 415                 if ((edge_type == EDGE_DEPENDS) && (strcmp(field, field2) != 0)) {
 416                         type = EDGE_OR_DEPENDS;
 417                 }
 418                 else if ((edge_type == EDGE_PRE_DEPENDS) && (strcmp(field, field2) != 0)) {
 419                         type = EDGE_OR_PRE_DEPENDS;
 420                 } else {
 421                         type = edge_type;
 422                 }
 423
 424                 do {
 425                         edge = (edge_t *) xmalloc(sizeof(edge_t));
 426                         edge->type = type;
 427
 428                         /* Skip any extra leading spaces */
 429                         field2 += strspn(field2, " ");
 430
 431                         /* Get dependency version info */
 432                         version = strchr(field2, '(');
 433                         if (version == NULL) {
 434                                 edge->operator = VER_ANY;
 435                                 /* Get the versions hash number, adding it if the number isnt already in there */
 436                                 edge->version = search_name_hashtable("ANY");
 437                         } else {
 438                                 /* Skip leading ' ' or '(' */
 439                                 version += strspn(field2, " ");
 440                                 version += strspn(version, "(");
 441                                 /* Calculate length of any operator charactors */
 442                                 offset_ch = strspn(version, "<=>");
 443                                 /* Determine operator */
 444                                 if (offset_ch > 0) {
 445                                         if (strncmp(version, "=", offset_ch) == 0) {
 446                                                 edge->operator = VER_EQUAL;
 447                                         }
 448                                         else if (strncmp(version, "<<", offset_ch) == 0) {
 449                                                 edge->operator = VER_LESS;
 450                                         }
 451                                         else if (strncmp(version, "<=", offset_ch) == 0) {
 452                                                 edge->operator = VER_LESS_EQUAL;
 453                                         }
 454                                         else if (strncmp(version, ">>", offset_ch) == 0) {
 455                                                 edge->operator = VER_MORE;
 456                                         }
 457                                         else if (strncmp(version, ">=", offset_ch) == 0) {
 458                                                 edge->operator = VER_MORE_EQUAL;
 459                                         } else {
 460                                                 error_msg_and_die("Illegal operator\n");
 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                         /* link the new edge to the current node */
 478                         parent_node->num_of_edges++;
 479                         parent_node->edge = xrealloc(parent_node->edge, sizeof(edge_t) * (parent_node->num_of_edges + 1));
 480                         parent_node->edge[parent_node->num_of_edges - 1] = edge;
 481                 } while ((field2 = strtok_r(NULL, "|", &line_ptr2)) != NULL);
 482                 free(line2);
 483         } while ((field = strtok_r(NULL, ",", &line_ptr1)) != NULL);
 484         free(line);
 485
 486         return;
 487 }
 488
 489 void free_package(common_node_t *node)
 490 {
 491         unsigned short i;
 492         if (node) {
 493                 for (i = 0; i < node->num_of_edges; i++) {
 494                         if (node->edge[i]) {
 495                                 free(node->edge[i]);
 496                         }
 497                 }
 498                 if (node->edge) {
 499                         free(node->edge);
 500                 }
 501                 free(node);
 502         }
 503 }
 504
 505 unsigned int fill_package_struct(char *control_buffer)
 506 {
 507         common_node_t *new_node = (common_node_t *) xcalloc(1, sizeof(common_node_t));
 508
 509         char *field_name;
 510         char *field_value;
 511         int field_start = 0;
 512         int num = -1;
 513         int buffer_length = strlen(control_buffer);
 514
 515         new_node->version = search_name_hashtable("unknown");
 516         while (field_start < buffer_length) {
 517                 field_start += read_package_field(&control_buffer[field_start],
 518                                 &field_name, &field_value);
 519
 520                 if (field_name == NULL) {
 521                         goto fill_package_struct_cleanup; // Oh no, the dreaded goto statement !!
 522                 }
 523
 524                 if (strcmp(field_name, "Package") == 0) {
 525                         new_node->name = search_name_hashtable(field_value);
 526                 }
 527                 else if (strcmp(field_name, "Version") == 0) {
 528                         new_node->version = search_name_hashtable(field_value);
 529                 }
 530                 else if (strcmp(field_name, "Pre-Depends") == 0) {
 531                         add_split_dependencies(new_node, field_value, EDGE_PRE_DEPENDS);
 532                 }
 533                 else if (strcmp(field_name, "Depends") == 0) {
 534                         add_split_dependencies(new_node, field_value, EDGE_DEPENDS);
 535                 }
 536                 else if (strcmp(field_name, "Replaces") == 0) {
 537                         add_split_dependencies(new_node, field_value, EDGE_REPLACES);
 538                 }
 539                 else if (strcmp(field_name, "Provides") == 0) {
 540                         add_split_dependencies(new_node, field_value, EDGE_PROVIDES);
 541                 }
 542                 else if (strcmp(field_name, "Conflicts") == 0) {
 543                         add_split_dependencies(new_node, field_value, EDGE_CONFLICTS);
 544                 }
 545                 else if (strcmp(field_name, "Suggests") == 0) {
 546                         add_split_dependencies(new_node, field_value, EDGE_SUGGESTS);
 547                 }
 548                 else if (strcmp(field_name, "Recommends") == 0) {
 549                         add_split_dependencies(new_node, field_value, EDGE_RECOMMENDS);
 550                 }
 551                 else if (strcmp(field_name, "Enhances") == 0) {
 552                         add_split_dependencies(new_node, field_value, EDGE_ENHANCES);
 553                 }
 554 fill_package_struct_cleanup:
 555                 if (field_name) {
 556                         free(field_name);
 557                 }
 558                 if (field_value) {
 559                         free(field_value);
 560                 }
 561         }
 562
 563         if (new_node->version == search_name_hashtable("unknown")) {
 564                 free_package(new_node);
 565                 return(-1);
 566         }
 567         num = search_package_hashtable(new_node->name, new_node->version, VER_EQUAL);
 568         if (package_hashtable[num] == NULL) {
 569                 package_hashtable[num] = new_node;
 570         } else {
 571                 free_package(new_node);
 572         }
 573         return(num);
 574 }
 575
 576 /* if num = 1, it returns the want status, 2 returns flag, 3 returns status */
 577 unsigned int get_status(const unsigned int status_node, const int num)
 578 {
 579         char *status_string = name_hashtable[status_hashtable[status_node]->status];
 580         char *state_sub_string;
 581         unsigned int state_sub_num;
 582         int len;
 583         int i;
 584
 585         /* set tmp_string to point to the start of the word number */
 586         for (i = 1; i < num; i++) {
 587                 /* skip past a word */
 588                 status_string += strcspn(status_string, " ");
 589                 /* skip past the seperating spaces */
 590                 status_string += strspn(status_string, " ");
 591         }
 592         len = strcspn(status_string, " \n\0");
 593         state_sub_string = xstrndup(status_string, len);
 594         state_sub_num = search_name_hashtable(state_sub_string);
 595         free(state_sub_string);
 596         return(state_sub_num);
 597 }
 598
 599 void set_status(const unsigned int status_node_num, const char *new_value, const int position)
 600 {
 601         const unsigned int new_value_len = strlen(new_value);
 602         const unsigned int new_value_num = search_name_hashtable(new_value);
 603         unsigned int want = get_status(status_node_num, 1);
 604         unsigned int flag = get_status(status_node_num, 2);
 605         unsigned int status = get_status(status_node_num, 3);
 606         int want_len = strlen(name_hashtable[want]);
 607         int flag_len = strlen(name_hashtable[flag]);
 608         int status_len = strlen(name_hashtable[status]);
 609         char *new_status;
 610
 611         switch (position) {
 612                 case (1):
 613                         want = new_value_num;
 614                         want_len = new_value_len;
 615                         break;
 616                 case (2):
 617                         flag = new_value_num;
 618                         flag_len = new_value_len;
 619                         break;
 620                 case (3):
 621                         status = new_value_num;
 622                         status_len = new_value_len;
 623                         break;
 624                 default:
 625                         error_msg_and_die("DEBUG ONLY: this shouldnt happen");
 626         }
 627
 628         new_status = (char *) xmalloc(want_len + flag_len + status_len + 3);
 629         sprintf(new_status, "%s %s %s", name_hashtable[want], name_hashtable[flag], name_hashtable[status]);
 630         status_hashtable[status_node_num]->status = search_name_hashtable(new_status);
 631         free(new_status);
 632         return;
 633 }
 634
 635 void index_status_file(const char *filename)
 636 {
 637         FILE *status_file;
 638         char *control_buffer;
 639         char *status_line;
 640         status_node_t *status_node = NULL;
 641         unsigned int status_num;
 642
 643         status_file = xfopen(filename, "r");
 644         while ((control_buffer = fgets_str(status_file, "\n\n")) != NULL) {
 645                 const unsigned int package_num = fill_package_struct(control_buffer);
 646                 if (package_num != -1) {
 647                         status_node = xmalloc(sizeof(status_node_t));
 648                         /* fill_package_struct doesnt handle the status field */
 649                         status_line = strstr(control_buffer, "Status:");
 650                         if (status_line != NULL) {
 651                                 status_line += 7;
 652                                 status_line += strspn(status_line, " \n\t");
 653                                 status_line = xstrndup(status_line, strcspn(status_line, "\n\0"));
 654                                 status_node->status = search_name_hashtable(status_line);
 655                                 free(status_line);
 656                         }
 657                         status_node->package = package_num;
 658                         status_num = search_status_hashtable(name_hashtable[package_hashtable[status_node->package]->name]);
 659                         status_hashtable[status_num] = status_node;
 660                 }
 661                 free(control_buffer);
 662         }
 663         fclose(status_file);
 664         return;
 665 }
 666
 667
 668 char *get_depends_field(common_node_t *package, const int depends_type)
 669 {
 670         char *depends = NULL;
 671         char *old_sep = (char *)xcalloc(1, 3);
 672         char *new_sep = (char *)xcalloc(1, 3);
 673         int line_size = 0;
 674         int depends_size;
 675
 676         int i;
 677
 678         for (i = 0; i < package->num_of_edges; i++) {
 679                 if ((package->edge[i]->type == EDGE_OR_PRE_DEPENDS) ||
 680                         (package->edge[i]->type == EDGE_OR_DEPENDS)) {
 681                 }
 682
 683                 if ((package->edge[i]->type == depends_type) ||
 684                         (package->edge[i]->type == depends_type + 1)) {
 685                         /* Check if its the first time through */
 686
 687                         depends_size = 8 + strlen(name_hashtable[package->edge[i]->name])
 688                                 + strlen(name_hashtable[package->edge[i]->version]);
 689                         line_size += depends_size;
 690                         depends = (char *) xrealloc(depends, line_size + 1);
 691
 692                         /* Check to see if this dependency is the type we are looking for
 693                          * +1 to check for 'extra' types, e.g. ored dependecies */
 694                         strcpy(old_sep, new_sep);
 695                         if (package->edge[i]->type == depends_type) {
 696                                 strcpy(new_sep, ", ");
 697                         }
 698                         else if (package->edge[i]->type == depends_type + 1) {
 699                                 strcpy(new_sep, "| ");
 700                         }
 701
 702                         if (depends_size == line_size) {
 703                                 strcpy(depends, "");
 704                         } else {
 705                                 if ((strcmp(old_sep, "| ") == 0) && (strcmp(new_sep, "| ") == 0)) {
 706                                         strcat(depends, " | ");
 707                                 } else {
 708                                         strcat(depends, ", ");
 709                                 }
 710                         }
 711
 712                         strcat(depends, name_hashtable[package->edge[i]->name]);
 713                         if (strcmp(name_hashtable[package->edge[i]->version], "NULL") != 0) {
 714                                 if (package->edge[i]->operator == VER_EQUAL) {
 715                                         strcat(depends, " (= ");
 716                                 }
 717                                 else if (package->edge[i]->operator == VER_LESS) {
 718                                         strcat(depends, " (<< ");
 719                                 }
 720                                 else if (package->edge[i]->operator == VER_LESS_EQUAL) {
 721                                         strcat(depends, " (<= ");
 722                                 }
 723                                 else if (package->edge[i]->operator == VER_MORE) {
 724                                         strcat(depends, " (>> ");
 725                                 }
 726                                 else if (package->edge[i]->operator == VER_MORE_EQUAL) {
 727                                         strcat(depends, " (>= ");
 728                                 } else {
 729                                         strcat(depends, " (");
 730                                 }
 731                                 strcat(depends, name_hashtable[package->edge[i]->version]);
 732                                 strcat(depends, ")");
 733                         }
 734                 }
 735         }
 736         return(depends);
 737 }
 738
 739 void write_buffer_no_status(FILE *new_status_file, const char *control_buffer)
 740 {
 741         char *name;
 742         char *value;
 743         int start = 0;
 744         while (1) {
 745                 start += read_package_field(&control_buffer[start], &name, &value);
 746                 if (name == NULL) {
 747                         break;
 748                 }
 749                 if (strcmp(name, "Status") != 0) {
 750                         fprintf(new_status_file, "%s: %s\n", name, value);
 751                 }
 752         }
 753         return;
 754 }
 755
 756 /* This could do with a cleanup */
 757 void write_status_file(deb_file_t **deb_file)
 758 {
 759         FILE *old_status_file = xfopen("/var/lib/dpkg/status", "r");
 760         FILE *new_status_file = xfopen("/var/lib/dpkg/status.udeb", "w");
 761         char *package_name;
 762         char *status_from_file;
 763         char *control_buffer = NULL;
 764         char *tmp_string;
 765         int status_num;
 766         int field_start = 0;
 767         int write_flag;
 768         int i = 0;
 769
 770         /* Update previously known packages */
 771         while ((control_buffer = fgets_str(old_status_file, "\n\n")) != NULL) {
 772                 if ((tmp_string = strstr(control_buffer, "Package:")) == NULL) {
 773                         continue;
 774                 }
 775
 776                 tmp_string += 8;
 777                 tmp_string += strspn(tmp_string, " \n\t");
 778                 package_name = xstrndup(tmp_string, strcspn(tmp_string, "\n\0"));
 779                 write_flag = FALSE;
 780                 tmp_string = strstr(control_buffer, "Status:");
 781                 if (tmp_string != NULL) {
 782                         /* Seperate the status value from the control buffer */
 783                         tmp_string += 7;
 784                         tmp_string += strspn(tmp_string, " \n\t");
 785                         status_from_file = xstrndup(tmp_string, strcspn(tmp_string, "\n"));
 786                 } else {
 787                         status_from_file = NULL;
 788                 }
 789
 790                 /* Find this package in the status hashtable */
 791                 status_num = search_status_hashtable(package_name);
 792                 if (status_hashtable[status_num] != NULL) {
 793                         const char *status_from_hashtable = name_hashtable[status_hashtable[status_num]->status];
 794                         if (strcmp(status_from_file, status_from_hashtable) != 0) {
 795                                 /* New status isnt exactly the same as old status */
 796                                 const int state_status = get_status(status_num, 3);
 797                                 if ((strcmp("installed", name_hashtable[state_status]) == 0) ||
 798                                         (strcmp("unpacked", name_hashtable[state_status]) == 0)) {
 799                                         /* We need to add the control file from the package */
 800                                         i = 0;
 801                                         while(deb_file[i] != NULL) {
 802                                                 if (strcmp(package_name, name_hashtable[package_hashtable[deb_file[i]->package]->name]) == 0) {
 803                                                         /* Write a status file entry with a modified status */
 804                                                         /* remove trailing \n's */
 805                                                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 806                                                         set_status(status_num, "ok", 2);
 807                                                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 808                                                         write_flag = TRUE;
 809                                                         break;
 810                                                 }
 811                                                 i++;
 812                                         }
 813                                         /* This is temperary, debugging only */
 814                                         if (deb_file[i] == NULL) {
 815                                                 error_msg_and_die("ALERT: Couldnt find a control file, your status file may be broken, status may be incorrect for %s", package_name);
 816                                         }
 817                                 }
 818                                 else if (strcmp("not-installed", name_hashtable[state_status]) == 0) {
 819                                         /* Only write the Package, Status, Priority and Section lines */
 820                                         fprintf(new_status_file, "Package: %s\n", package_name);
 821                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 822
 823                                         while (1) {
 824                                                 char *field_name;
 825                                                 char *field_value;
 826                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 827                                                 if (field_name == NULL) {
 828                                                         break;
 829                                                 }
 830                                                 if ((strcmp(field_name, "Priority") == 0) ||
 831                                                         (strcmp(field_name, "Section") == 0)) {
 832                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 833                                                 }
 834                                         }
 835                                         write_flag = TRUE;
 836                                         fputs("\n", new_status_file);
 837                                 }
 838                                 else if (strcmp("config-files", name_hashtable[state_status]) == 0) {
 839                                         /* only change the status line */
 840                                         while (1) {
 841                                                 char *field_name;
 842                                                 char *field_value;
 843                                                 field_start += read_package_field(&control_buffer[field_start], &field_name, &field_value);
 844                                                 if (field_name == NULL) {
 845                                                         break;
 846                                                 }
 847                                                 /* Setup start point for next field */
 848                                                 if (strcmp(field_name, "Status") == 0) {
 849                                                         fprintf(new_status_file, "Status: %s\n", status_from_hashtable);
 850                                                 } else {
 851                                                         fprintf(new_status_file, "%s: %s\n", field_name, field_value);
 852                                                 }
 853                                         }
 854                                         write_flag = TRUE;
 855                                         fputs("\n", new_status_file);
 856                                 }
 857                         }
 858                 }
 859                 /* If the package from the status file wasnt handle above, do it now*/
 860                 if (! write_flag) {
 861                         fprintf(new_status_file, "%s\n\n", control_buffer);
 862                 }
 863
 864                 if (status_from_file != NULL) {
 865                         free(status_from_file);
 866                 }
 867                 free(package_name);
 868                 free(control_buffer);
 869         }
 870
 871         /* Write any new packages */
 872         for(i = 0; deb_file[i] != NULL; i++) {
 873                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[i]->package]->name]);
 874                 if (strcmp("reinstreq", name_hashtable[get_status(status_num, 2)]) == 0) {
 875                         write_buffer_no_status(new_status_file, deb_file[i]->control_file);
 876                         set_status(status_num, "ok", 2);
 877                         fprintf(new_status_file, "Status: %s\n\n", name_hashtable[status_hashtable[status_num]->status]);
 878                 }
 879         }
 880         fclose(old_status_file);
 881         fclose(new_status_file);
 882
 883
 884         /* Create a seperate backfile to dpkg */
 885         if (rename("/var/lib/dpkg/status", "/var/lib/dpkg/status.udeb.bak") == -1) {
 886                 struct stat stat_buf;
 887                 if (stat("/var/lib/dpkg/status", &stat_buf) == 0) {
 888                         error_msg_and_die("Couldnt create backup status file");
 889                 }
 890                 /* Its ok if renaming the status file fails becasue status
 891                  * file doesnt exist, maybe we are starting from scratch */
 892                 error_msg("No status file found, creating new one");
 893         }
 894
 895         if (rename("/var/lib/dpkg/status.udeb", "/var/lib/dpkg/status") == -1) {
 896                 error_msg_and_die("DANGER: Couldnt create status file, you need to manually repair your status file");
 897         }
 898 }
 899
 900 int check_deps(deb_file_t **deb_file, int deb_start, int dep_max_count)
 901 {
 902         int *conflicts = NULL;
 903         int conflicts_num = 0;
 904         int state_status;
 905         int state_flag;
 906         int state_want;
 907         int i = deb_start;
 908         int j;
 909
 910         /* Check for conflicts
 911          * TODO: TEST if conflicts with other packages to be installed
 912          *
 913          * Add install packages and the packages they provide
 914          * to the list of files to check conflicts for
 915          */
 916
 917         /* Create array of package numbers to check against
 918          * installed package for conflicts*/
 919         while (deb_file[i] != NULL) {
 920                 const unsigned int package_num = deb_file[i]->package;
 921                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
 922                 conflicts[conflicts_num] = package_num;
 923                 conflicts_num++;
 924                 /* add provides to conflicts list */
 925                 for (j = 0; j < package_hashtable[package_num]->num_of_edges; j++) {
 926                         if (package_hashtable[package_num]->edge[j]->type == EDGE_PROVIDES) {
 927                                 const int conflicts_package_num = search_package_hashtable(
 928                                         package_hashtable[package_num]->edge[j]->name,
 929                                         package_hashtable[package_num]->edge[j]->version,
 930                                         package_hashtable[package_num]->edge[j]->operator);
 931                                 if (package_hashtable[conflicts_package_num] == NULL) {
 932                                         /* create a new package */
 933                                         common_node_t *new_node = (common_node_t *) xmalloc(sizeof(common_node_t));
 934                                         new_node->name = package_hashtable[package_num]->edge[j]->name;
 935                                         new_node->version = package_hashtable[package_num]->edge[j]->version;
 936                                         new_node->num_of_edges = 0;
 937                                         new_node->edge = NULL;
 938                                         package_hashtable[conflicts_package_num] = new_node;
 939                                 }
 940                                 conflicts = xrealloc(conflicts, sizeof(int) * (conflicts_num + 1));
 941                                 conflicts[conflicts_num] = conflicts_package_num;
 942                                 conflicts_num++;
 943                         }
 944                 }
 945                 i++;
 946         }
 947
 948         /* Check conflicts */
 949         i = 0;
 950         while (deb_file[i] != NULL) {
 951                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
 952                 int status_num = 0;
 953                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
 954
 955                 if (get_status(status_num, 3) == search_name_hashtable("installed")) {
 956                         i++;
 957                         continue;
 958                 }
 959
 960                 for (j = 0; j < package_node->num_of_edges; j++) {
 961                         const edge_t *package_edge = package_node->edge[j];
 962                         const unsigned int package_num =
 963                         search_package_hashtable(package_edge->name,
 964                                 package_edge->version, package_edge->operator);
 965
 966                         if (package_edge->type == EDGE_CONFLICTS) {
 967                                 int result = 0;
 968                                 if (package_hashtable[package_num] != NULL) {
 969                                         status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
 970                                         state_status = get_status(status_num, 3);
 971                                         state_flag = get_status(status_num, 1);
 972
 973                                         result = (state_status == search_name_hashtable("installed")) ||
 974                                                 (state_flag == search_name_hashtable("want-install"));
 975
 976                                         if (result) {
 977                                                 result = test_version(package_hashtable[deb_file[i]->package]->version,
 978                                                         package_edge->version, package_edge->operator);
 979                                         }
 980                                 }
 981
 982                                 if (result) {
 983                                         error_msg_and_die("Package %s conflicts with %s",
 984                                                 name_hashtable[package_node->name],
 985                                                 name_hashtable[package_edge->name]);
 986                                 }
 987                         }
 988                 }
 989                 i++;
 990         }
 991
 992
 993         /* Check dependendcies */
 994         i = 0;
 995         while (deb_file[i] != NULL) {
 996                 const common_node_t *package_node = package_hashtable[deb_file[i]->package];
 997                 int status_num = 0;
 998
 999                 status_num = search_status_hashtable(name_hashtable[package_node->name]);
1000                 state_status = get_status(status_num, 3);
1001                 state_want = get_status(status_num, 1);
1002
1003                 if (state_status == search_name_hashtable("installed")) {
1004                         i++;
1005                         continue;
1006                 }
1007
1008                 for (j = 0; j < package_hashtable[deb_file[i]->package]->num_of_edges; j++) {
1009                         const edge_t *package_edge = package_node->edge[j];
1010                         unsigned int package_num;
1011
1012                         package_num = search_package_hashtable(package_edge->name, package_edge->version, package_edge->operator);
1013
1014                         switch (package_edge->type) {
1015                                 case(EDGE_PRE_DEPENDS):
1016                                 case(EDGE_OR_PRE_DEPENDS): {
1017                                         int result=1;
1018                                         /* It must be already installed */
1019                                         /* NOTE: This is untested, nothing apropriate in my status file */
1020                                         if (package_hashtable[package_num] != NULL) {
1021                                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1022                                                 state_status = get_status(status_num, 3);
1023                                                 state_want = get_status(status_num, 1);
1024                                                 result = (state_status != search_name_hashtable("installed"));
1025                                         }
1026
1027                                         if (result) {
1028                                                 error_msg_and_die("Package %s pre-depends on %s, but it is not installed",
1029                                                         name_hashtable[package_node->name],
1030                                                         name_hashtable[package_edge->name]);
1031                                         }
1032                                         break;
1033                                 }
1034                                 case(EDGE_DEPENDS):
1035                                 case(EDGE_OR_DEPENDS): {
1036                                         int result=1;
1037                                         if (package_hashtable[package_num] != NULL) {
1038                                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[package_num]->name]);
1039                                                 state_status = get_status(status_num, 3);
1040                                                 state_want = get_status(status_num, 1);
1041                                                 result=(state_status != search_name_hashtable("installed")) && (state_want != search_name_hashtable("want-install"));
1042                                         }
1043                                         /* It must be already installed, or to be installed */
1044                                         if (result) {
1045                                                 error_msg_and_die("Package %s depends on %s, but it is not installed, or flaged to be installed",
1046                                                         name_hashtable[package_node->name],
1047                                                         name_hashtable[package_edge->name]);
1048                                         }
1049                                         break;
1050                                 }
1051                         }
1052                 }
1053                 i++;
1054         }
1055         free(conflicts);
1056         return(TRUE);
1057 }
1058
1059 char **create_list(const char *filename)
1060 {
1061         FILE *list_stream;
1062         char **file_list = NULL;
1063         char *line = NULL;
1064         int length = 0;
1065         int count = 0;
1066
1067         /* dont use [xw]fopen here, handle error ourself */
1068         list_stream = fopen(filename, "r");
1069         if (list_stream == NULL) {
1070                 return(NULL);
1071         }
1072
1073         while (getline(&line, &length, list_stream) != -1) {
1074                 file_list = xrealloc(file_list, sizeof(char *) * (count + 2));
1075                 chomp(line);
1076                 file_list[count] = xstrdup(line);
1077                 count++;
1078         }
1079         fclose(list_stream);
1080         free(line);
1081
1082         if (count == 0) {
1083                 return(NULL);
1084         } else {
1085                 file_list[count] = NULL;
1086                 return(file_list);
1087         }
1088 }
1089
1090 /* maybe i should try and hook this into remove_file.c somehow */
1091 int remove_file_array(char **remove_names, char **exclude_names)
1092 {
1093         struct stat path_stat;
1094         int match_flag;
1095         int remove_flag = FALSE;
1096         int i,j;
1097
1098         if (remove_names == NULL) {
1099                 return(FALSE);
1100         }
1101         for (i = 0; remove_names[i] != NULL; i++) {
1102                 match_flag = FALSE;
1103                 if (exclude_names != NULL) {
1104                         for (j = 0; exclude_names[j] != 0; j++) {
1105                                 if (strcmp(remove_names[i], exclude_names[j]) == 0) {
1106                                         match_flag = TRUE;
1107                                         break;
1108                                 }
1109                         }
1110                 }
1111                 if (!match_flag) {
1112                         if (lstat(remove_names[i], &path_stat) < 0) {
1113                                 continue;
1114                         }
1115                         if (S_ISDIR(path_stat.st_mode)) {
1116                                 if (rmdir(remove_names[i]) != -1) {
1117                                         remove_flag = TRUE;
1118                                 }
1119                         } else {
1120                                 if (unlink(remove_names[i]) != -1) {
1121                                         remove_flag = TRUE;
1122                                 }
1123                         }
1124                 }
1125         }
1126         return(remove_flag);
1127 }
1128
1129 int run_package_script(const char *package_name, const char *script_type)
1130 {
1131         struct stat path_stat;
1132         char *script_path;
1133         int result;
1134
1135         script_path = xmalloc(strlen(package_name) + strlen(script_type) + 21);
1136         sprintf(script_path, "/var/lib/dpkg/info/%s.%s", package_name, script_type);
1137
1138         /* If the file doesnt exist is isnt a fatal */
1139         if (lstat(script_path, &path_stat) < 0) {
1140                 result = EXIT_SUCCESS;
1141         } else {
1142                 result = system(script_path);
1143         }
1144         free(script_path);
1145         return(result);
1146 }
1147
1148 char **all_control_list(const char *package_name)
1149 {
1150         const char *extensions[11] = {"preinst", "postinst", "prerm", "postrm",
1151                 "list", "md5sums", "shlibs", "conffiles", "config", "templates", NULL };
1152         unsigned short i = 0;
1153         char **remove_files;
1154
1155         /* Create a list of all /var/lib/dpkg/info/<package> files */
1156         remove_files = malloc(sizeof(char *) * 11);
1157         while (extensions[i]) {
1158                 remove_files[i] = xmalloc(strlen(package_name) + strlen(extensions[i]) + 21);
1159                 sprintf(remove_files[i], "/var/lib/dpkg/info/%s.%s", package_name, extensions[i]);
1160                 i++;
1161         }
1162         remove_files[10] = NULL;
1163
1164         return(remove_files);
1165 }
1166
1167 void free_array(char **array)
1168 {
1169
1170         if (array) {
1171                 unsigned short i = 0;
1172                 while (array[i]) {
1173                         free(array[i]);
1174                         i++;
1175                 }
1176                 free(array);
1177         }
1178 }
1179
1180 /* This function lists information on the installed packages. It loops through
1181  * the status_hashtable to retrieve the info. This results in smaller code than
1182  * scanning the status file. The resulting list, however, is unsorted.
1183  */
1184 void list_packages(void)
1185 {
1186         int i;
1187
1188         printf("    Name           Version\n");
1189         printf("+++-==============-==============\n");
1190
1191         /* go through status hash, dereference package hash and finally strings */
1192         for (i=0; i<STATUS_HASH_PRIME+1; i++) {
1193
1194                 if (status_hashtable[i]) {
1195                         const char *stat_str;  /* status string */
1196                         const char *name_str;  /* package name */
1197                         const char *vers_str;  /* version */
1198                         char  s1, s2;          /* status abbreviations */
1199                         int   spccnt;          /* space count */
1200                         int   j;
1201
1202                         stat_str = name_hashtable[status_hashtable[i]->status];
1203                         name_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->name];
1204                         vers_str = name_hashtable[package_hashtable[status_hashtable[i]->package]->version];
1205
1206                         /* get abbreviation for status field 1 */
1207                         s1 = stat_str[0] == 'i' ? 'i' : 'r';
1208
1209                         /* get abbreviation for status field 2 */
1210                         for (j=0, spccnt=0; stat_str[j] && spccnt<2; j++) {
1211                                 if (stat_str[j] == ' ') spccnt++;
1212                         }
1213                         s2 = stat_str[j];
1214
1215                         /* print out the line formatted like Debian dpkg */
1216                         printf("%c%c  %-14s %s\n", s1, s2, name_str, vers_str);
1217                 }
1218     }
1219 }
1220
1221 void remove_package(const unsigned int package_num)
1222 {
1223         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1224         const unsigned int status_num = search_status_hashtable(package_name);
1225         const int package_name_length = strlen(package_name);
1226         char **remove_files;
1227         char **exclude_files;
1228         char list_name[package_name_length + 25];
1229         char conffile_name[package_name_length + 30];
1230         int return_value;
1231
1232         printf("Removing %s ...\n", package_name);
1233
1234         /* run prerm script */
1235         return_value = run_package_script(package_name, "prerm");
1236         if (return_value == -1) {
1237                 error_msg_and_die("script failed, prerm failure");
1238         }
1239
1240         /* Create a list of files to remove, and a seperate list of those to keep */
1241         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1242         remove_files = create_list(list_name);
1243
1244         sprintf(conffile_name, "/var/lib/dpkg/info/%s.conffiles", package_name);
1245         exclude_files = create_list(conffile_name);
1246
1247         /* Some directories cant be removed straight away, so do multiple passes */
1248         while (remove_file_array(remove_files, exclude_files));
1249         free_array(exclude_files);
1250         free_array(remove_files);
1251
1252         /* Create a list of files in /var/lib/dpkg/info/<package>.* to keep  */
1253         exclude_files = xmalloc(sizeof(char*) * 3);
1254         exclude_files[0] = xstrdup(conffile_name);
1255         exclude_files[1] = xmalloc(package_name_length + 27);
1256         sprintf(exclude_files[1], "/var/lib/dpkg/info/%s.postrm", package_name);
1257         exclude_files[2] = NULL;
1258
1259         /* Create a list of all /var/lib/dpkg/info/<package> files */
1260         remove_files = all_control_list(package_name);
1261
1262         remove_file_array(remove_files, exclude_files);
1263         free_array(remove_files);
1264         free_array(exclude_files);
1265
1266         /* rename <package>.conffile to <package>.list */
1267         rename(conffile_name, list_name);
1268
1269         /* Change package status */
1270         set_status(status_num, "deinstall", 1);
1271         set_status(status_num, "config-files", 3);
1272 }
1273
1274 void purge_package(const unsigned int package_num)
1275 {
1276         const char *package_name = name_hashtable[package_hashtable[package_num]->name];
1277         const unsigned int status_num = search_status_hashtable(package_name);
1278         char **remove_files;
1279         char **exclude_files;
1280         char list_name[strlen(package_name) + 25];
1281
1282         /* run prerm script */
1283         if (run_package_script(package_name, "prerm") != 0) {
1284                 error_msg_and_die("script failed, prerm failure");
1285         }
1286
1287         /* Create a list of files to remove */
1288         sprintf(list_name, "/var/lib/dpkg/info/%s.list", package_name);
1289         remove_files = create_list(list_name);
1290
1291         exclude_files = xmalloc(sizeof(char*));
1292         exclude_files[0] = NULL;
1293
1294         /* Some directories cant be removed straight away, so do multiple passes */
1295         while (remove_file_array(remove_files, exclude_files));
1296         free_array(remove_files);
1297
1298         /* Create a list of all /var/lib/dpkg/info/<package> files */
1299         remove_files = all_control_list(package_name);
1300         remove_file_array(remove_files, exclude_files);
1301         free_array(remove_files);
1302         free(exclude_files);
1303
1304         /* run postrm script */
1305         if (run_package_script(package_name, "postrm") == -1) {
1306                 error_msg_and_die("postrm fialure.. set status to what?");
1307         }
1308
1309         /* Change package status */
1310         set_status(status_num, "purge", 1);
1311         set_status(status_num, "not-installed", 3);
1312 }
1313
1314 static archive_handle_t *deb_extract(const char *filename, const char *ar_name,
1315         const char *tar_gz_name, char *prefix, void (*deb_action_data)(struct archive_handle_s *))
1316 {
1317         archive_handle_t *ar_archive;
1318         archive_handle_t *tar_gz_archive;
1319
1320         /* Setup the tar archive handle */
1321         tar_gz_archive = init_handle();
1322         tar_gz_archive->filter = filter_accept_reject_list;
1323         tar_gz_archive->action_data = deb_action_data;
1324         tar_gz_archive->buffer = prefix;
1325         if (tar_gz_name) {
1326                 tar_gz_archive->accept = add_to_list(NULL, tar_gz_name);
1327         }
1328
1329         /* Setup an ar archive handle that refers to the gzip sub archive */
1330         ar_archive = init_handle();
1331         ar_archive->action_data_subarchive = get_header_tar_gz;
1332         ar_archive->sub_archive = tar_gz_archive;
1333         ar_archive->filter = filter_accept_reject_list;
1334         ar_archive->accept = add_to_list(NULL, ar_name);
1335
1336         tar_gz_archive->src_fd = ar_archive->src_fd = xopen(filename, O_RDONLY);
1337
1338         unpack_ar_archive(ar_archive);
1339         close(ar_archive->src_fd);
1340
1341         return(ar_archive->sub_archive);
1342 }
1343
1344 void unpack_package(deb_file_t *deb_file)
1345 {
1346         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1347         const unsigned int status_num = search_status_hashtable(package_name);
1348         const unsigned int status_package_num = status_hashtable[status_num]->package;
1349         char *info_prefix;
1350         archive_handle_t *archive_handle;
1351         FILE *out_stream;
1352
1353         /* If existing version, remove it first */
1354         if (strcmp(name_hashtable[get_status(status_num, 3)], "installed") == 0) {
1355                 /* Package is already installed, remove old version first */
1356                 printf("Preparing to replace %s %s (using %s) ...\n", package_name,
1357                         name_hashtable[package_hashtable[status_package_num]->version],
1358                         deb_file->filename);
1359                 remove_package(status_package_num);
1360         } else {
1361                 printf("Unpacking %s (from %s) ...\n", package_name, deb_file->filename);
1362         }
1363
1364         /* Extract control.tar.gz to /var/lib/dpkg/info/<package>.filename */
1365         info_prefix = (char *) xmalloc(strlen(package_name) + 20 + 4 + 2);
1366         sprintf(info_prefix, "/var/lib/dpkg/info/%s.", package_name);
1367
1368         deb_extract(deb_file->filename, "control.tar.gz", NULL, info_prefix, data_extract_all_prefix);
1369         /* Run the preinst prior to extracting */
1370         if (run_package_script(package_name, "preinst") != 0) {
1371                 /* when preinst returns exit code != 0 then quit installation process */
1372                 error_msg_and_die("subprocess pre-installation script returned error.");
1373         }
1374
1375         /* Extract data.tar.gz to the root directory */
1376         archive_handle = deb_extract(deb_file->filename, "data.tar.gz", NULL, NULL, data_extract_all);
1377
1378         /* Create the list file */
1379         strcat(info_prefix, "list");
1380         out_stream = xfopen(info_prefix, "w");
1381         while (archive_handle->passed) {
1382                 /* blindly skip over the leading '.' */
1383                 fputs(archive_handle->passed->data + 1, out_stream);
1384                 fputc('\n', out_stream);
1385                 archive_handle->passed = archive_handle->passed->link;
1386         }
1387         fclose(out_stream);
1388
1389         /* change status */
1390         set_status(status_num, "install", 1);
1391         set_status(status_num, "unpacked", 3);
1392
1393         free(info_prefix);
1394 }
1395
1396 void configure_package(deb_file_t *deb_file)
1397 {
1398         const char *package_name = name_hashtable[package_hashtable[deb_file->package]->name];
1399         const char *package_version = name_hashtable[package_hashtable[deb_file->package]->version];
1400         const int status_num = search_status_hashtable(package_name);
1401
1402         printf("Setting up %s (%s)\n", package_name, package_version);
1403
1404         /* Run the postinst script */
1405         if (run_package_script(package_name, "postinst") != 0) {
1406                 /* TODO: handle failure gracefully */
1407                 error_msg_and_die("postrm failure.. set status to what?");
1408         }
1409         /* Change status to reflect success */
1410         set_status(status_num, "install", 1);
1411         set_status(status_num, "installed", 3);
1412 }
1413
1414 int dpkg_main(int argc, char **argv)
1415 {
1416         deb_file_t **deb_file = NULL;
1417         status_node_t *status_node;
1418         int opt;
1419         int package_num;
1420         int dpkg_opt = 0;
1421         int deb_count = 0;
1422         int state_status;
1423         int status_num;
1424         int i;
1425
1426         while ((opt = getopt(argc, argv, "CF:ilPru")) != -1) {
1427                 switch (opt) {
1428                         case 'C': // equivalent to --configure in official dpkg
1429                                 dpkg_opt |= dpkg_opt_configure;
1430                                 dpkg_opt |= dpkg_opt_package_name;
1431                                 break;
1432                         case 'F': // equivalent to --force in official dpkg
1433                                 if (strcmp(optarg, "depends") == 0) {
1434                                         dpkg_opt |= dpkg_opt_force_ignore_depends;
1435                                 }
1436                         case 'i':
1437                                 dpkg_opt |= dpkg_opt_install;
1438                                 dpkg_opt |= dpkg_opt_filename;
1439                                 break;
1440                         case 'l':
1441                                 dpkg_opt |= dpkg_opt_list_installed;
1442                                 break;
1443                         case 'P':
1444                                 dpkg_opt |= dpkg_opt_purge;
1445                                 dpkg_opt |= dpkg_opt_package_name;
1446                                 break;
1447                         case 'r':
1448                                 dpkg_opt |= dpkg_opt_remove;
1449                                 dpkg_opt |= dpkg_opt_package_name;
1450                                 break;
1451                         case 'u':       /* Equivalent to --unpack in official dpkg */
1452                                 dpkg_opt |= dpkg_opt_unpack;
1453                                 dpkg_opt |= dpkg_opt_filename;
1454                                 break;
1455                         default:
1456                                 show_usage();
1457                 }
1458         }
1459         /* check for non-otion argument if expected  */
1460         if ((dpkg_opt == 0) || ((argc == optind) && !(dpkg_opt && dpkg_opt_list_installed))) {
1461                 show_usage();
1462         }
1463
1464 /*      puts("(Reading database ... xxxxx files and directories installed.)"); */
1465         index_status_file("/var/lib/dpkg/status");
1466
1467         /* if the list action was given print the installed packages and exit */
1468         if (dpkg_opt & dpkg_opt_list_installed) {
1469                 list_packages();
1470                 return(EXIT_SUCCESS);
1471         }
1472
1473         /* Read arguments and store relevant info in structs */
1474         while (optind < argc) {
1475                 /* deb_count = nb_elem - 1 and we need nb_elem + 1 to allocate terminal node [NULL pointer] */
1476                 deb_file = xrealloc(deb_file, sizeof(deb_file_t *) * (deb_count + 2));
1477                 deb_file[deb_count] = (deb_file_t *) xmalloc(sizeof(deb_file_t));
1478                 if (dpkg_opt & dpkg_opt_filename) {
1479                         archive_handle_t *archive_handle;
1480                         deb_file[deb_count]->filename = xstrdup(argv[optind]);
1481                         archive_handle = deb_extract(argv[optind], "control.tar.gz", "./control", NULL, data_extract_to_buffer);
1482                         deb_file[deb_count]->control_file = archive_handle->buffer;
1483                         if (deb_file[deb_count]->control_file == NULL) {
1484                                 error_msg_and_die("Couldnt extract control file");
1485                         }
1486                         package_num = fill_package_struct(deb_file[deb_count]->control_file);
1487
1488                         if (package_num == -1) {
1489                                 error_msg("Invalid control file in %s", argv[optind]);
1490                                 continue;
1491                         }
1492                         deb_file[deb_count]->package = (unsigned int) package_num;
1493                         /* Add the package to the status hashtable */
1494                         if ((dpkg_opt & dpkg_opt_unpack) || (dpkg_opt & dpkg_opt_install)) {
1495                                 status_node = (status_node_t *) xmalloc(sizeof(status_node_t));
1496                                 status_node->package = deb_file[deb_count]->package;
1497                                 /* Try and find a currently installed version of this package */
1498                                 status_num = search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1499                                 /* If no previous entry was found initialise a new entry */
1500                                 if ((status_hashtable[status_num] == NULL) ||
1501                                         (status_hashtable[status_num]->status == 0)) {
1502                                         /* reinstreq isnt changed to "ok" until the package control info
1503                                          * is written to the status file*/
1504                                         status_node->status = search_name_hashtable("want-install reinstreq not-installed");
1505                                         status_hashtable[status_num] = status_node;
1506                                 } else {
1507                                         status_hashtable[status_num]->status = search_name_hashtable("want-install reinstreq not-installed");
1508                                 }
1509                         }
1510                 }
1511                 else if (dpkg_opt & dpkg_opt_package_name) {
1512                         deb_file[deb_count]->filename = NULL;
1513                         deb_file[deb_count]->control_file = NULL;
1514                         deb_file[deb_count]->package = search_package_hashtable(
1515                                 search_name_hashtable(argv[optind]),
1516                                 search_name_hashtable("ANY"), VER_ANY);
1517                         if (package_hashtable[deb_file[deb_count]->package] == NULL) {
1518                                 error_msg_and_die("Package %s is uninstalled or unknown\n", argv[optind]);
1519                         }
1520                         state_status = get_status(search_status_hashtable(name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]), 3);
1521
1522                         /* check package status is "installed" */
1523                         if (dpkg_opt & dpkg_opt_remove) {
1524                                 if ((strcmp(name_hashtable[state_status], "not-installed") == 0) ||
1525                                         (strcmp(name_hashtable[state_status], "config-files") == 0)) {
1526                                         error_msg_and_die("%s is already removed.", name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1527                                 }
1528                         }
1529                         else if (dpkg_opt & dpkg_opt_purge) {
1530                                 /* if package status is "conf-files" then its ok */
1531                                 if (strcmp(name_hashtable[state_status], "not-installed") == 0) {
1532                                         error_msg_and_die("%s is already purged.", name_hashtable[package_hashtable[deb_file[deb_count]->package]->name]);
1533                                 }
1534                         }
1535                 }
1536                 deb_count++;
1537                 optind++;
1538         }
1539         deb_file[deb_count] = NULL;
1540
1541         /* Check that the deb file arguments are installable */
1542         /* TODO: check dependencies before removing */
1543         if ((dpkg_opt & dpkg_opt_force_ignore_depends) != dpkg_opt_force_ignore_depends) {
1544                 if (!check_deps(deb_file, 0, deb_count)) {
1545                         error_msg_and_die("Dependency check failed");
1546                 }
1547         }
1548
1549         for (i = 0; i < deb_count; i++) {
1550                 /* Remove or purge packages */
1551                 if (dpkg_opt & dpkg_opt_remove) {
1552                         remove_package(deb_file[i]->package);
1553                 }
1554                 else if (dpkg_opt & dpkg_opt_purge) {
1555                         purge_package(deb_file[i]->package);
1556                 }
1557                 else if (dpkg_opt & dpkg_opt_unpack) {
1558                         unpack_package(deb_file[i]);
1559                 }
1560                 else if (dpkg_opt & dpkg_opt_install) {
1561                         unpack_package(deb_file[i]);
1562                         configure_package(deb_file[i]);
1563                 }
1564                 else if (dpkg_opt & dpkg_opt_configure) {
1565                         configure_package(deb_file[i]);
1566                 }
1567         }
1568
1569         write_status_file(deb_file);
1570
1571         for (i = 0; i < deb_count; i++) {
1572                 free(deb_file[i]->control_file);
1573                 free(deb_file[i]->filename);
1574                 free(deb_file[i]);
1575         }
1576
1577         free(deb_file);
1578
1579         for (i = 0; i < NAME_HASH_PRIME; i++) {
1580                 if (name_hashtable[i] != NULL) {
1581                         free(name_hashtable[i]);
1582                 }
1583         }
1584
1585         for (i = 0; i < PACKAGE_HASH_PRIME; i++) {
1586                 if (package_hashtable[i] != NULL) {
1587                         free_package(package_hashtable[i]);
1588                 }
1589         }
1590
1591         for (i = 0; i < STATUS_HASH_PRIME; i++) {
1592                 if (status_hashtable[i] != NULL) {
1593                         free(status_hashtable[i]);
1594                 }
1595         }
1596
1597         return(EXIT_SUCCESS);
1598 }
1599