src/client/main.c

   1 /*
   2  * OpenDispense 2
   3  * UCC (University [of WA] Computer Club) Electronic Accounting System
   4  * - Dispense Client
   5  *
   6  * main.c - Core and Initialisation
   7  *
   8  * This file is licenced under the 3-clause BSD Licence. See the file
   9  * COPYING for full details.
  10  */
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include <ctype.h>      // isspace
  15 #include <stdarg.h>
  16 #include <regex.h>
  17 #include <ncurses.h>
  18 #include <limits.h>
  19
  20 #include <unistd.h>     // close
  21 #include <netdb.h>      // gethostbyname
  22 #include <pwd.h>        // getpwuids
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26 #include <openssl/sha.h>        // SHA1
  27
  28 #define USE_NCURSES_INTERFACE   0
  29 #define DEBUG_TRACE_SERVER      0
  30 #define USE_AUTOAUTH    1
  31
  32 #define MAX_TXT_ARGS    5       // Maximum number of textual arguments (including command)
  33
  34 enum eUI_Modes
  35 {
  36         UI_MODE_BASIC,  // Non-NCurses
  37         UI_MODE_STANDARD,
  38         UI_MODE_DRINKSONLY,
  39         UI_MODE_ALL,
  40         NUM_UI_MODES
  41 };
  42
  43 // === TYPES ===
  44 typedef struct sItem {
  45         char    *Type;
  46          int    ID;
  47          int    Status; // 0: Availiable, 1: Sold out, -1: Error
  48         char    *Desc;
  49          int    Price;
  50 }       tItem;
  51
  52 // === PROTOTYPES ===
  53  int    main(int argc, char *argv[]);
  54 void    ShowUsage(void);
  55 // --- GUI ---
  56  int    ShowNCursesUI(void);
  57  int    ShowItemAt(int Row, int Col, int Width, int Index, int bHilighted);
  58 void    PrintAlign(int Row, int Col, int Width, const char *Left, char Pad1, const char *Mid, char Pad2, const char *Right, ...);
  59 // --- Coke Server Communication ---
  60  int    OpenConnection(const char *Host, int Port);
  61  int    Authenticate(int Socket);
  62  int    GetUserBalance(int Socket);
  63 void    PopulateItemList(int Socket);
  64  int    Dispense_ItemInfo(int Socket, const char *Type, int ID);
  65  int    DispenseItem(int Socket, const char *Type, int ID);
  66  int    Dispense_AlterBalance(int Socket, const char *Username, int Ammount, const char *Reason);
  67  int    Dispense_SetBalance(int Socket, const char *Username, int Balance, const char *Reason);
  68  int    Dispense_Give(int Socket, const char *Username, int Ammount, const char *Reason);
  69  int    Dispense_Donate(int Socket, int Ammount, const char *Reason);
  70  int    Dispense_EnumUsers(int Socket);
  71  int    Dispense_ShowUser(int Socket, const char *Username);
  72 void    _PrintUserLine(const char *Line);
  73  int    Dispense_AddUser(int Socket, const char *Username);
  74  int    Dispense_SetUserType(int Socket, const char *Username, const char *TypeString);
  75 // --- Helpers ---
  76 char    *ReadLine(int Socket);
  77  int    sendf(int Socket, const char *Format, ...);
  78 char    *trim(char *string);
  79  int    RunRegex(regex_t *regex, const char *string, int nMatches, regmatch_t *matches, const char *errorMessage);
  80 void    CompileRegex(regex_t *regex, const char *pattern, int flags);
  81
  82 // === GLOBALS ===
  83 char    *gsDispenseServer = "heathred";
  84  int    giDispensePort = 11020;
  85
  86 tItem   *gaItems;
  87  int    giNumItems;
  88 regex_t gArrayRegex, gItemRegex, gSaltRegex, gUserInfoRegex, gUserItemIdentRegex;
  89  int    gbIsAuthenticated = 0;
  90
  91 char    *gsItemPattern; //!< Item pattern
  92 char    *gsEffectiveUser;       //!< '-u' Dispense as another user
  93  int    giUIMode = UI_MODE_STANDARD;
  94  int    gbDryRun = 0;   //!< '-n' Read-only
  95  int    giMinimumBalance = INT_MIN;     //!< '-m' Minumum balance for `dispense acct`
  96  int    giMaximumBalance = INT_MAX;     //!< '-M' Maximum balance for `dispense acct`
  97 char    *gsUserName;    //!< User that dispense will happen as
  98 char    *gsUserFlags;   //!< User's flag set
  99  int    giUserBalance=-1;       //!< User balance (set by Authenticate)
 100
 101 // === CODE ===
 102 int main(int argc, char *argv[])
 103 {
 104          int    sock;
 105          int    i, ret = 0;
 106         char    buffer[BUFSIZ];
 107         char    *text_args[MAX_TXT_ARGS];       // Non-flag arguments
 108          int    text_argc = 0;
 109
 110         text_args[0] = "";
 111
 112         // -- Create regular expressions
 113         // > Code Type Count ...
 114         CompileRegex(&gArrayRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+([0-9]+)", REG_EXTENDED);     //
 115         // > Code Type Ident Status Price Desc
 116         CompileRegex(&gItemRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+([A-Za-z]+):([0-9]+)\\s+(avail|sold|error)\\s+([0-9]+)\\s+(.+)$", REG_EXTENDED);
 117         // > Code 'SALT' salt
 118         CompileRegex(&gSaltRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+(.+)$", REG_EXTENDED);
 119         // > Code 'User' Username Balance Flags
 120         CompileRegex(&gUserInfoRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+([^ ]+)\\s+(-?[0-9]+)\\s+(.+)$", REG_EXTENDED);
 121         // > Item Ident
 122         CompileRegex(&gUserItemIdentRegex, "^([A-Za-z]+):([0-9]+)$", REG_EXTENDED);
 123
 124         // Parse Arguments
 125         for( i = 1; i < argc; i ++ )
 126         {
 127                 char    *arg = argv[i];
 128
 129                 if( arg[0] == '-' )
 130                 {
 131                         switch(arg[1])
 132                         {
 133                         case 'h':
 134                         case '?':
 135                                 ShowUsage();
 136                                 return 0;
 137
 138                         case 'm':       // Minimum balance
 139                                 if( i + 1 >= argc ) {
 140                                         fprintf(stderr, "%s: -m takes an argument\n", argv[0]);
 141                                         ShowUsage();
 142                                 }
 143                                 giMinimumBalance = atoi(argv[++i]);
 144                                 break;
 145                         case 'M':       // Maximum balance
 146                                 if( i + 1 >= argc ) {
 147                                         fprintf(stderr, "%s: -M takes an argument\n", argv[0]);
 148                                         ShowUsage();
 149                                 }
 150                                 giMaximumBalance = atoi(argv[++i]);
 151                                 break;
 152
 153                         case 'u':       // Override User
 154                                 if( i + 1 >= argc ) {
 155                                         fprintf(stderr, "%s: -u takes an argument\n", argv[0]);
 156                                         ShowUsage();
 157                                 }
 158                                 gsEffectiveUser = argv[++i];
 159                                 break;
 160
 161                         case 'H':       // Override remote host
 162                                 if( i + 1 >= argc ) {
 163                                         fprintf(stderr, "%s: -H takes an argument\n", argv[0]);
 164                                         ShowUsage();
 165                                 }
 166                                 gsDispenseServer = argv[++i];
 167                                 break;
 168                         case 'P':       // Override remote port
 169                                 if( i + 1 >= argc ) {
 170                                         fprintf(stderr, "%s: -P takes an argument\n", argv[0]);
 171                                         ShowUsage();
 172                                 }
 173                                 giDispensePort = atoi(argv[++i]);
 174                                 break;
 175
 176                         case 'G':       // Don't use GUI
 177                                 giUIMode = UI_MODE_BASIC;
 178                                 break;
 179                         case 'D':       // Drinks only
 180                                 giUIMode = UI_MODE_DRINKSONLY;
 181                                 break;
 182                         case 'n':       // Dry Run / read-only
 183                                 gbDryRun = 1;
 184                                 break;
 185                         case '0':       case '1':
 186                         case '2':       case '3':
 187                         case '4':       case '5':
 188                         case '6':       case '7':
 189                         case '8':       case '9':
 190                                 if( text_argc + 1 ==  MAX_TXT_ARGS )
 191                                 {
 192                                         fprintf(stderr, "ERROR: Too many arguments\n");
 193                                         return 1;
 194                                 }
 195                                 text_args[text_argc++] = argv[i];
 196                                 break;
 197                         }
 198
 199                         continue;
 200                 }
 201
 202                 if( text_argc + 1 == MAX_TXT_ARGS )
 203                 {
 204                         fprintf(stderr, "ERROR: Too many arguments\n");
 205                         return 1;
 206                 }
 207
 208                 text_args[text_argc++] = argv[i];
 209
 210         }
 211
 212         //
 213         // `dispense acct`
 214         // -
 215         if( strcmp(text_args[0], "acct") == 0 )
 216         {
 217                 // Connect to server
 218                 sock = OpenConnection(gsDispenseServer, giDispensePort);
 219                 if( sock < 0 )  return -1;
 220                         // List accounts?
 221                 if( text_argc == 1 ) {
 222                         ret = Dispense_EnumUsers(sock);
 223                         close(sock);
 224                         return ret;
 225                 }
 226
 227                 // text_args[1]: Username
 228
 229                 // Alter account?
 230                 if( text_argc == 4 )
 231                 {
 232                         // Authentication required
 233                         if( Authenticate(sock) )
 234                                 return -1;
 235
 236                         // text_args[1]: Username
 237                         // text_args[2]: Ammount
 238                         // text_args[3]: Reason
 239
 240                         if( text_args[2][0] == '=' ) {
 241                                 // Set balance
 242                                 if( text_args[2][1] != '0' && atoi(text_args[2]+1) == 0 ) {
 243                                         fprintf(stderr, "Error: Invalid balance to be set\n");
 244                                         exit(1);
 245                                 }
 246
 247                                 ret = Dispense_SetBalance(sock, text_args[1], atoi(text_args[2]+1), text_args[3]);
 248                         }
 249                         else {
 250                                 // Alter balance
 251                                 ret = Dispense_AlterBalance(sock, text_args[1], atoi(text_args[2]), text_args[3]);
 252                         }
 253                 }
 254                 // TODO: Preserve ret if non-zero
 255
 256                 // Show user information
 257                 ret = Dispense_ShowUser(sock, text_args[1]);
 258
 259                 close(sock);
 260                 return ret;
 261         }
 262         //
 263         // `dispense give`
 264         // - "Here, have some money."
 265         if( strcmp(text_args[0], "give") == 0 )
 266         {
 267                 if( text_argc != 4 ) {
 268                         fprintf(stderr, "`dispense give` takes three arguments\n");
 269                         ShowUsage();
 270                         return -1;
 271                 }
 272
 273                 // text_args[1]: Destination
 274                 // text_args[2]: Ammount
 275                 // text_args[3]: Reason
 276
 277                 // Connect to server
 278                 sock = OpenConnection(gsDispenseServer, giDispensePort);
 279                 if( sock < 0 )  return -1;
 280
 281                 // Authenticate
 282                 if( Authenticate(sock) )
 283                         return -1;
 284
 285                 ret = Dispense_Give(sock, text_args[1], atoi(text_args[2]), text_args[3]);
 286
 287                 close(sock);
 288
 289                 return ret;
 290         }
 291         //
 292         // `dispense user`
 293         // - User administration (Admin Only)
 294         if( strcmp(text_args[0], "user") == 0 )
 295         {
 296                 // Check argument count
 297                 if( text_argc == 1 ) {
 298                         fprintf(stderr, "Error: `dispense user` requires arguments\n");
 299                         ShowUsage();
 300                         exit(1);
 301                 }
 302
 303                 // Connect to server
 304                 sock = OpenConnection(gsDispenseServer, giDispensePort);
 305                 if( sock < 0 )  return -1;
 306
 307                 // Attempt authentication
 308                 if( Authenticate(sock) )
 309                         return -1;
 310
 311                 // Add new user?
 312                 if( strcmp(text_args[1], "add") == 0 )
 313                 {
 314                         if( text_argc != 3 ) {
 315                                 fprintf(stderr, "Error: `dispense user add` requires an argument\n");
 316                                 ShowUsage();
 317                                 exit(1);
 318                         }
 319
 320                         ret = Dispense_AddUser(sock, text_args[2]);
 321                 }
 322                 // Update a user
 323                 else if( strcmp(text_args[1], "type") == 0 || strcmp(text_args[1], "flags") == 0 )
 324                 {
 325                         if( text_argc != 4 ) {
 326                                 fprintf(stderr, "Error: `dispense user flags` requires two arguments\n");
 327                                 ShowUsage();
 328                                 exit(1);
 329                         }
 330
 331                         ret = Dispense_SetUserType(sock, text_args[2], text_args[3]);
 332                 }
 333                 else
 334                 {
 335                         fprintf(stderr, "Error: Unknown sub-command for `dispense user`\n");
 336                         ShowUsage();
 337                         exit(1);
 338                 }
 339                 close(sock);
 340                 return ret;
 341         }
 342         // Donation!
 343         else if( strcmp(text_args[0], "donate") == 0 )
 344         {
 345                 // Check argument count
 346                 if( text_argc != 3 ) {
 347                         fprintf(stderr, "Error: `dispense donate` requires two arguments\n");
 348                         ShowUsage();
 349                         exit(1);
 350                 }
 351
 352                 // Connect to server
 353                 sock = OpenConnection(gsDispenseServer, giDispensePort);
 354                 if( sock < 0 )  return -1;
 355
 356                 // Attempt authentication
 357                 if( Authenticate(sock) )
 358                         return -1;
 359
 360                 // Do donation
 361                 ret =Dispense_Donate(sock, atoi(text_args[1]), text_args[2]);
 362
 363                 close(sock);
 364
 365                 return ret;
 366         }
 367         // Query an item price
 368         else if( strcmp(text_args[0], "iteminfo") == 0 )
 369         {
 370                 regmatch_t matches[3];
 371                 char    *type;
 372                  int    id;
 373                 // Check argument count
 374                 if( text_argc != 2 ) {
 375                         fprintf(stderr, "Error: `dispense iteminfo` requires an argument\n");
 376                         ShowUsage();
 377                         exit(1);
 378                 }
 379                 // Parse item ID
 380                 if( RunRegex(&gUserItemIdentRegex, text_args[1], 3, matches, NULL) != 0 ) {
 381                         fprintf(stderr, "Error: Invalid item ID passed (<type>:<id> expected)\n");
 382                         exit(1);
 383                 }
 384                 type = text_args[1] + matches[1].rm_so;
 385                 text_args[1][ matches[1].rm_eo ] = '\0';
 386                 id = atoi( text_args[1] + matches[2].rm_so );
 387
 388                 sock = OpenConnection(gsDispenseServer, giDispensePort);
 389                 if( sock < 0 )  return -1;
 390                 ret = Dispense_ItemInfo(sock, type, id);
 391                 close(sock);
 392                 return ret;
 393         }
 394         // Item name / pattern
 395         else {
 396                 gsItemPattern = text_args[0];
 397         }
 398
 399         // Connect to server
 400         sock = OpenConnection(gsDispenseServer, giDispensePort);
 401         if( sock < 0 )  return -1;
 402
 403         // Get the user's balance
 404         GetUserBalance(sock);
 405
 406         // Get items
 407         PopulateItemList(sock);
 408
 409         // Disconnect from server
 410         close(sock);
 411
 412         if( gsItemPattern && gsItemPattern[0] )
 413         {
 414                 regmatch_t matches[3];
 415                 // Door (hard coded)
 416                 if( strcmp(gsItemPattern, "door") == 0 )
 417                 {
 418                         // Connect, Authenticate, dispense and close
 419                         sock = OpenConnection(gsDispenseServer, giDispensePort);
 420                         if( sock < 0 )  return -1;
 421                         Authenticate(sock);
 422                         ret = DispenseItem(sock, "door", 0);
 423                         close(sock);
 424                         return ret;
 425                 }
 426                 // Item id (<type>:<num>)
 427                 else if( RunRegex(&gUserItemIdentRegex, gsItemPattern, 3, matches, NULL) == 0 )
 428                 {
 429                         char    *ident;
 430                          int    id;
 431
 432                         // Get and finish ident
 433                         ident = gsItemPattern + matches[1].rm_so;
 434                         gsItemPattern[matches[1].rm_eo] = '\0';
 435                         // Get ID
 436                         id = atoi( gsItemPattern + matches[2].rm_so );
 437
 438                         // Connect, Authenticate, dispense and close
 439                         sock = OpenConnection(gsDispenseServer, giDispensePort);
 440                         if( sock < 0 )  return -1;
 441
 442                         Dispense_ItemInfo(sock, ident, id);
 443
 444                         Authenticate(sock);
 445                         ret = DispenseItem(sock, ident, id);
 446                         close(sock);
 447                         return ret;
 448                 }
 449                 // Item number (6 = coke)
 450                 else if( strcmp(gsItemPattern, "0") == 0 || atoi(gsItemPattern) > 0 )
 451                 {
 452                         i = atoi(gsItemPattern);
 453                 }
 454                 // Item prefix
 455                 else
 456                 {
 457                          int    j;
 458                          int    best = -1;
 459                         for( i = 0; i < giNumItems; i ++ )
 460                         {
 461                                 // Prefix match (with case-insensitive match)
 462                                 for( j = 0; gsItemPattern[j]; j ++ )
 463                                 {
 464                                         if( gaItems[i].Desc[j] == gsItemPattern[j] )
 465                                                 continue;
 466                                         if( tolower(gaItems[i].Desc[j]) == tolower(gsItemPattern[j]) )
 467                                                 continue;
 468                                         break;
 469                                 }
 470                                 // Check if the prefix matched
 471                                 if( gsItemPattern[j] != '\0' )
 472                                         continue;
 473
 474                                 // Prefect match
 475                                 if( gaItems[i].Desc[j] == '\0' ) {
 476                                         best = i;
 477                                         break;
 478                                 }
 479
 480                                 // Only one match allowed
 481                                 if( best == -1 ) {
 482                                         best = i;
 483                                 }
 484                                 else {
 485                                         // TODO: Allow ambiguous matches?
 486                                         // or just print a wanrning
 487                                         printf("Warning - Ambiguous pattern, stopping\n");
 488                                         return 1;
 489                                 }
 490                         }
 491
 492                         // Was a match found?
 493                         if( best == -1 )
 494                         {
 495                                 fprintf(stderr, "No item matches the passed string\n");
 496                                 return 1;
 497                         }
 498
 499                         i = best;
 500                 }
 501         }
 502         else if( giUIMode != UI_MODE_BASIC )
 503         {
 504                 i = ShowNCursesUI();
 505         }
 506         else
 507         {
 508                 // Very basic dispense interface
 509                 for( i = 0; i < giNumItems; i ++ ) {
 510                         // Add a separator
 511                         if( i && strcmp(gaItems[i].Type, gaItems[i-1].Type) != 0 )
 512                                 printf("   ---\n");
 513
 514                         printf("%2i %s:%i\t%3i %s\n", i, gaItems[i].Type, gaItems[i].ID,
 515                                 gaItems[i].Price, gaItems[i].Desc);
 516                 }
 517                 printf(" q Quit\n");
 518                 for(;;)
 519                 {
 520                         char    *buf;
 521
 522                         i = -1;
 523
 524                         fgets(buffer, BUFSIZ, stdin);
 525
 526                         buf = trim(buffer);
 527
 528                         if( buf[0] == 'q' )     break;
 529
 530                         i = atoi(buf);
 531
 532                         if( i != 0 || buf[0] == '0' )
 533                         {
 534                                 if( i < 0 || i >= giNumItems ) {
 535                                         printf("Bad item %i (should be between 0 and %i)\n", i, giNumItems);
 536                                         continue;
 537                                 }
 538                                 break;
 539                         }
 540                 }
 541         }
 542
 543
 544         // Check for a valid item ID
 545         if( i >= 0 )
 546         {
 547                 // Connect, Authenticate, dispense and close
 548                 sock = OpenConnection(gsDispenseServer, giDispensePort);
 549                 if( sock < 0 )  return -1;
 550
 551                 Dispense_ItemInfo(sock, gaItems[i].Type, gaItems[i].ID);
 552
 553                 Authenticate(sock);
 554                 ret = DispenseItem(sock, gaItems[i].Type, gaItems[i].ID);
 555                 close(sock);
 556         }
 557
 558         return ret;
 559 }
 560
 561 void ShowUsage(void)
 562 {
 563         printf(
 564                 "Usage:\n"
 565                 "  == Everyone ==\n"
 566                 "    dispense\n"
 567                 "        Show interactive list\n"
 568                 "    dispense <name>|<index>|<itemid>\n"
 569                 "        Dispense named item (<name> matches if it is a unique prefix)\n"
 570                 "    dispense give <user> <ammount> \"<reason>\"\n"
 571                 "        Give money to another user\n"
 572                 "    dispense donate <ammount> \"<reason>\"\n"
 573                 "        Donate to the club\n"
 574                 "    dispense iteminfo <type>:<id>\n"
 575                 "        Get the name and price for an item\n"
 576                 "  == Coke members == \n"
 577                 "    dispense acct [<user>]\n"
 578                 "        Show user balances\n"
 579                 "    dispense acct <user> [+-]<ammount> \"<reason>\"\n"
 580                 "        Alter a account value\n"
 581                 "  == Dispense administrators ==\n"
 582                 "    dispense acct <user> =<ammount> \"<reason>\"\n"
 583                 "        Set an account balance\n"
 584                 "    dispense user add <user>\n"
 585                 "        Create new coke account (Admins only)\n"
 586                 "    dispense user type <user> <flags>\n"
 587                 "        Alter a user's flags\n"
 588                 "        <flags> is a comma-separated list of user, coke, admin or disabled\n"
 589                 "        Flags are removed by preceding the name with '-' or '!'\n"
 590                 "\n"
 591                 "General Options:\n"
 592                 "    -u <username>\n"
 593                 "        Set a different user (Coke members only)\n"
 594                 "    -h / -?\n"
 595                 "        Show help text\n"
 596                 "    -G\n"
 597                 "        Use alternate GUI\n"
 598                 "    -m <min balance>\n"
 599                 "    -M <max balance>\n"
 600                 "        Set the Maximum/Minimum balances shown in `dispense acct`\n"
 601                 );
 602 }
 603
 604 // -------------------
 605 // --- NCurses GUI ---
 606 // -------------------
 607 /**
 608  * \brief Render the NCurses UI
 609  */
 610 int ShowNCursesUI(void)
 611 {
 612         // TODO: ncurses interface (with separation between item classes)
 613         // - Hmm... that would require standardising the item ID to be <class>:<index>
 614         // Oh, why not :)
 615          int    ch;
 616          int    i, times;
 617          int    xBase, yBase;
 618         const int       displayMinWidth = 40;
 619         char    *titleString = "Dispense";
 620          int    itemCount;
 621          int    maxItemIndex;
 622          int    itemBase = 0;
 623          int    currentItem;
 624          int    ret = -2;       // -2: Used for marking "no return yet"
 625
 626         char    balance_str[5+1+2+1];   // If $9999.99 is too little, something's wrong
 627         char    *username;
 628         struct passwd *pwd;
 629
 630          int    height, width;
 631
 632         // Get Username
 633         if( gsEffectiveUser )
 634                 username = gsEffectiveUser;
 635         else {
 636                 pwd = getpwuid( getuid() );
 637                 username = pwd->pw_name;
 638         }
 639         // Get balance
 640         snprintf(balance_str, sizeof balance_str, "$%i.%02i", giUserBalance/100, giUserBalance%100);
 641
 642         // Enter curses mode
 643         initscr();
 644         raw(); noecho();
 645
 646         // Get max index
 647         maxItemIndex = ShowItemAt(0, 0, 0, -1, 0);
 648         // Get item count per screen
 649         // - 6: randomly chosen (Need at least 3)
 650         itemCount = LINES - 6;
 651         if( itemCount > maxItemIndex )
 652                 itemCount = maxItemIndex;
 653         // Get first index
 654         currentItem = 0;
 655         while( ShowItemAt(0, 0, 0, currentItem, 0) == -1 )
 656                 currentItem ++;
 657
 658
 659         // Get dimensions
 660         height = itemCount + 3;
 661         width = displayMinWidth;
 662
 663         // Get positions
 664         xBase = COLS/2 - width/2;
 665         yBase = LINES/2 - height/2;
 666
 667         for( ;; )
 668         {
 669                 // Header
 670                 PrintAlign(yBase, xBase, width, "/", '-', titleString, '-', "\\");
 671
 672                 // Items
 673                 for( i = 0; i < itemCount; i ++ )
 674                 {
 675                          int    pos = 0;
 676
 677                         move( yBase + 1 + i, xBase );
 678                         printw("| ");
 679
 680                         pos += 2;
 681
 682                         // Check for the '...' row
 683                         // - Oh god, magic numbers!
 684                         if( (i == 0 && itemBase > 0)
 685                          || (i == itemCount - 1 && itemBase < maxItemIndex - itemCount) )
 686                         {
 687                                 printw("     ...");     pos += 8;
 688                                 times = (width - pos) - 1;
 689                                 while(times--)  addch(' ');
 690                         }
 691                         // Show an item
 692                         else {
 693                                 ShowItemAt(
 694                                         yBase + 1 + i, xBase + pos,     // Position
 695                                         (width - pos) - 3,      // Width
 696                                         itemBase + i,   // Index
 697                                         !!(currentItem == itemBase + i) // Hilighted
 698                                         );
 699                                 printw("  ");
 700                         }
 701
 702                         // Scrollbar (if needed)
 703                         if( maxItemIndex > itemCount ) {
 704                                 if( i == 0 ) {
 705                                         addch('A');
 706                                 }
 707                                 else if( i == itemCount - 1 ) {
 708                                         addch('V');
 709                                 }
 710                                 else {
 711                                          int    percentage = itemBase * 100 / (maxItemIndex-itemCount);
 712                                         if( i-1 == percentage*(itemCount-3)/100 ) {
 713                                                 addch('#');
 714                                         }
 715                                         else {
 716                                                 addch('|');
 717                                         }
 718                                 }
 719                         }
 720                         else {
 721                                 addch('|');
 722                         }
 723                 }
 724
 725                 // Footer
 726                 PrintAlign(yBase+height-2, xBase, width, "\\", '-', "", '-', "/");
 727
 728                 // User line
 729                 // - Username, balance, flags
 730                 PrintAlign(yBase+height-1, xBase+1, width-2,
 731                         username, ' ', balance_str, ' ', gsUserFlags);
 732
 733
 734                 // Get input
 735                 ch = getch();
 736
 737                 if( ch == '\x1B' ) {
 738                         ch = getch();
 739                         if( ch == '[' ) {
 740                                 ch = getch();
 741
 742                                 switch(ch)
 743                                 {
 744                                 case 'B':
 745                                         currentItem ++;
 746                                         // Skip over spacers
 747                                         while( ShowItemAt(0, 0, 0, currentItem, 0) == -1 )
 748                                                 currentItem ++;
 749
 750                                         if( currentItem >= maxItemIndex ) {
 751                                                 currentItem = 0;
 752                                                 // Skip over spacers
 753                                                 while( ShowItemAt(0, 0, 0, currentItem, 0) == -1 )
 754                                                         currentItem ++;
 755                                         }
 756                                         break;
 757                                 case 'A':
 758                                         currentItem --;
 759                                         // Skip over spacers
 760                                         while( ShowItemAt(0, 0, 0, currentItem, 0) == -1 )
 761                                                 currentItem --;
 762
 763                                         if( currentItem < 0 ) {
 764                                                 currentItem = maxItemIndex - 1;
 765                                                 // Skip over spacers
 766                                                 while( ShowItemAt(0, 0, 0, currentItem, 0) == -1 )
 767                                                         currentItem --;
 768                                         }
 769                                         break;
 770                                 }
 771                         }
 772                         else {
 773
 774                         }
 775
 776                         if( itemCount > maxItemIndex && currentItem < itemBase + 2 && itemBase > 0 )
 777                                 itemBase = currentItem - 2;
 778                         if( itemCount > maxItemIndex && currentItem > itemBase + itemCount - 2 && itemBase < maxItemIndex-1 )
 779                                 itemBase = currentItem - itemCount + 2;
 780                 }
 781                 else {
 782                         switch(ch)
 783                         {
 784                         case '\n':
 785                                 ret = ShowItemAt(0, 0, 0, currentItem, 0);
 786                                 break;
 787                         case 'q':
 788                                 ret = -1;       // -1: Return with no dispense
 789                                 break;
 790                         }
 791
 792                         // Check if the return value was changed
 793                         if( ret != -2 ) break;
 794                 }
 795
 796         }
 797
 798
 799         // Leave
 800         endwin();
 801         return ret;
 802 }
 803
 804 /**
 805  * \brief Show item \a Index at (\a Col, \a Row)
 806  * \return Dispense index of item
 807  * \note Part of the NCurses UI
 808  */
 809 int ShowItemAt(int Row, int Col, int Width, int Index, int bHilighted)
 810 {
 811          int    _x, _y, times;
 812         char    *name = NULL;
 813          int    price = 0;
 814          int    status = -1;
 815
 816         switch(giUIMode)
 817         {
 818         // Standard UI
 819         // - This assumes that
 820         case UI_MODE_STANDARD:
 821                 // Bounds check
 822                 // Index = -1, request limit
 823                 if( Index < 0 || Index >= giNumItems+2 )
 824                         return giNumItems+2;
 825                 // Drink label
 826                 if( Index == 0 )
 827                 {
 828                         price = 0;
 829                         name = "Coke Machine";
 830                         Index = -1;     // -1 indicates a label
 831                         break;
 832                 }
 833                 Index --;
 834                 // Drinks 0 - 6
 835                 if( Index <= 6 )
 836                 {
 837                         name = gaItems[Index].Desc;
 838                         price = gaItems[Index].Price;
 839                         status = gaItems[Index].Status;
 840                         break;
 841                 }
 842                 Index -= 7;
 843                 // EPS label
 844                 if( Index == 0 )
 845                 {
 846                         price = 0;
 847                         name = "Electronic Payment System";
 848                         Index = -1;     // -1 indicates a label
 849                         break;
 850                 }
 851                 Index --;
 852                 Index += 7;
 853                 name = gaItems[Index].Desc;
 854                 price = gaItems[Index].Price;
 855                 status = gaItems[Index].Status;
 856                 break;
 857         default:
 858                 return -1;
 859         }
 860
 861         // Width = 0, don't print
 862         if( Width > 0 )
 863         {
 864                 move( Row, Col );
 865
 866                 if( Index >= 0 )
 867                 {
 868                         // Show hilight and status
 869                         switch( status )
 870                         {
 871                         case 0:
 872                                 if( bHilighted )
 873                                         printw("-> ");
 874                                 else
 875                                         printw("   ");
 876                                 break;
 877                         case 1:
 878                                 printw("SLD");
 879                                 break;
 880
 881                         default:
 882                         case -1:
 883                                 printw("ERR");
 884                                 break;
 885                         }
 886
 887                         printw(" %s", name);
 888
 889                         getyx(stdscr, _y, _x);
 890                         // Assumes max 4 digit prices
 891                         times = Width - 5 - (_x - Col); // TODO: Better handling for large prices
 892                         while(times--)  addch(' ');
 893
 894                         printw(" %4i", price);
 895                 }
 896                 else
 897                 {
 898                         printw("-- %s", name);
 899                         getyx(stdscr, _y, _x);
 900                         times = Width - 4 - (_x - Col);
 901                         while(times--)  addch(' ');
 902                         printw("    ");
 903                 }
 904         }
 905
 906         // If the item isn't availiable for sale, return -1 (so it's skipped)
 907         if( status )
 908                 Index = -1;
 909
 910         return Index;
 911 }
 912
 913 /**
 914  * \brief Print a three-part string at the specified position (formatted)
 915  * \note NCurses UI Helper
 916  *
 917  * Prints \a Left on the left of the area, \a Right on the righthand side
 918  * and \a Mid in the middle of the area. These are padded with \a Pad1
 919  * between \a Left and \a Mid, and \a Pad2 between \a Mid and \a Right.
 920  *
 921  * ::printf style format codes are allowed in \a Left, \a Mid and \a Right,
 922  * and the arguments to these are read in that order.
 923  */
 924 void PrintAlign(int Row, int Col, int Width, const char *Left, char Pad1,
 925         const char *Mid, char Pad2, const char *Right, ...)
 926 {
 927          int    lLen, mLen, rLen;
 928          int    times;
 929
 930         va_list args;
 931
 932         // Get the length of the strings
 933         va_start(args, Right);
 934         lLen = vsnprintf(NULL, 0, Left, args);
 935         mLen = vsnprintf(NULL, 0, Mid, args);
 936         rLen = vsnprintf(NULL, 0, Right, args);
 937         va_end(args);
 938
 939         // Sanity check
 940         if( lLen + mLen/2 > Width/2 || mLen/2 + rLen > Width/2 ) {
 941                 return ;        // TODO: What to do?
 942         }
 943
 944         move(Row, Col);
 945
 946         // Render strings
 947         va_start(args, Right);
 948         // - Left
 949         {
 950                 char    tmp[lLen+1];
 951                 vsnprintf(tmp, lLen+1, Left, args);
 952                 addstr(tmp);
 953         }
 954         // - Left padding
 955         times = (Width - mLen)/2 - lLen;
 956         while(times--)  addch(Pad1);
 957         // - Middle
 958         {
 959                 char    tmp[mLen+1];
 960                 vsnprintf(tmp, mLen+1, Mid, args);
 961                 addstr(tmp);
 962         }
 963         // - Right Padding
 964         times = (Width - mLen)/2 - rLen;
 965         if( (Width - mLen) % 2 )        times ++;
 966         while(times--)  addch(Pad2);
 967         // - Right
 968         {
 969                 char    tmp[rLen+1];
 970                 vsnprintf(tmp, rLen+1, Right, args);
 971                 addstr(tmp);
 972         }
 973 }
 974
 975 // ---------------------
 976 // --- Coke Protocol ---
 977 // ---------------------
 978 int OpenConnection(const char *Host, int Port)
 979 {
 980         struct hostent  *host;
 981         struct sockaddr_in      serverAddr;
 982          int    sock;
 983
 984         host = gethostbyname(Host);
 985         if( !host ) {
 986                 fprintf(stderr, "Unable to look up '%s'\n", Host);
 987                 return -1;
 988         }
 989
 990         memset(&serverAddr, 0, sizeof(serverAddr));
 991
 992         serverAddr.sin_family = AF_INET;        // IPv4
 993         // NOTE: I have a suspicion that IPv6 will play sillybuggers with this :)
 994         serverAddr.sin_addr.s_addr = *((unsigned long *) host->h_addr_list[0]);
 995         serverAddr.sin_port = htons(Port);
 996
 997         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 998         if( sock < 0 ) {
 999                 fprintf(stderr, "Failed to create socket\n");
1000                 return -1;
1001         }
1002
1003 //      printf("geteuid() = %i, getuid() = %i\n", geteuid(), getuid());
1004
1005         if( geteuid() == 0 || getuid() == 0 )
1006         {
1007                  int    i;
1008                 struct sockaddr_in      localAddr;
1009                 memset(&localAddr, 0, sizeof(localAddr));
1010                 localAddr.sin_family = AF_INET; // IPv4
1011
1012                 // Loop through all the top ports until one is avaliable
1013                 for( i = 512; i < 1024; i ++)
1014                 {
1015                         localAddr.sin_port = htons(i);  // IPv4
1016                         // Attempt to bind to low port for autoauth
1017                         if( bind(sock, (struct sockaddr*)&localAddr, sizeof(localAddr)) == 0 )
1018                                 break;
1019                 }
1020                 if( i == 1024 )
1021                         printf("Warning: AUTOAUTH unavaliable\n");
1022 //              else
1023 //                      printf("Bound to 0.0.0.0:%i\n", i);
1024         }
1025
1026         if( connect(sock, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0 ) {
1027                 fprintf(stderr, "Failed to connect to server\n");
1028                 return -1;
1029         }
1030
1031         return sock;
1032 }
1033
1034 /**
1035  * \brief Authenticate with the server
1036  * \return Boolean Failure
1037  */
1038 int Authenticate(int Socket)
1039 {
1040         struct passwd   *pwd;
1041         char    *buf;
1042          int    responseCode;
1043         char    salt[32];
1044          int    i;
1045         regmatch_t      matches[4];
1046
1047         if( gbIsAuthenticated ) return 0;
1048
1049         // Get user name
1050         pwd = getpwuid( getuid() );
1051
1052         // Attempt automatic authentication
1053         sendf(Socket, "AUTOAUTH %s\n", pwd->pw_name);
1054
1055         // Check if it worked
1056         buf = ReadLine(Socket);
1057
1058         responseCode = atoi(buf);
1059         switch( responseCode )
1060         {
1061         case 200:       // Autoauth succeeded, return
1062                 free(buf);
1063                 break;
1064
1065         case 401:       // Untrusted, attempt password authentication
1066                 free(buf);
1067
1068                 sendf(Socket, "USER %s\n", pwd->pw_name);
1069                 printf("Using username %s\n", pwd->pw_name);
1070
1071                 buf = ReadLine(Socket);
1072
1073                 // TODO: Get Salt
1074                 // Expected format: 100 SALT <something> ...
1075                 // OR             : 100 User Set
1076                 RunRegex(&gSaltRegex, buf, 4, matches, "Malformed server response");
1077                 responseCode = atoi(buf);
1078                 if( responseCode != 100 ) {
1079                         fprintf(stderr, "Unknown repsonse code %i from server\n%s\n", responseCode, buf);
1080                         free(buf);
1081                         return -1;      // ERROR
1082                 }
1083
1084                 // Check for salt
1085                 if( memcmp( buf+matches[2].rm_so, "SALT", matches[2].rm_eo - matches[2].rm_so) == 0) {
1086                         // Store it for later
1087                         memcpy( salt, buf + matches[3].rm_so, matches[3].rm_eo - matches[3].rm_so );
1088                         salt[ matches[3].rm_eo - matches[3].rm_so ] = 0;
1089                 }
1090                 free(buf);
1091
1092                 // Give three attempts
1093                 for( i = 0; i < 3; i ++ )
1094                 {
1095                          int    ofs = strlen(pwd->pw_name)+strlen(salt);
1096                         char    tmpBuf[42];
1097                         char    tmp[ofs+20];
1098                         char    *pass = getpass("Password: ");
1099                         uint8_t h[20];
1100
1101                         // Create hash string
1102                         // <username><salt><hash>
1103                         strcpy(tmp, pwd->pw_name);
1104                         strcat(tmp, salt);
1105                         SHA1( (unsigned char*)pass, strlen(pass), h );
1106                         memcpy(tmp+ofs, h, 20);
1107
1108                         // Hash all that
1109                         SHA1( (unsigned char*)tmp, ofs+20, h );
1110                         sprintf(tmpBuf, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
1111                                 h[ 0], h[ 1], h[ 2], h[ 3], h[ 4], h[ 5], h[ 6], h[ 7], h[ 8], h[ 9],
1112                                 h[10], h[11], h[12], h[13], h[14], h[15], h[16], h[17], h[18], h[19]
1113                                 );
1114
1115                         // Send password
1116                         sendf(Socket, "PASS %s\n", tmpBuf);
1117                         buf = ReadLine(Socket);
1118
1119                         responseCode = atoi(buf);
1120                         // Auth OK?
1121                         if( responseCode == 200 )       break;
1122                         // Bad username/password
1123                         if( responseCode == 401 )       continue;
1124
1125                         fprintf(stderr, "Unknown repsonse code %i from server\n%s\n", responseCode, buf);
1126                         free(buf);
1127                         return -1;
1128                 }
1129                 free(buf);
1130                 if( i == 3 )
1131                         return 2;       // 2 = Bad Password
1132                 break;
1133
1134         case 404:       // Bad Username
1135                 fprintf(stderr, "Bad Username '%s'\n", pwd->pw_name);
1136                 free(buf);
1137                 return 1;
1138
1139         default:
1140                 fprintf(stderr, "Unkown response code %i from server\n", responseCode);
1141                 printf("%s\n", buf);
1142                 free(buf);
1143                 return -1;
1144         }
1145
1146         // Set effective user
1147         if( gsEffectiveUser ) {
1148                 sendf(Socket, "SETEUSER %s\n", gsEffectiveUser);
1149
1150                 buf = ReadLine(Socket);
1151                 responseCode = atoi(buf);
1152
1153                 switch(responseCode)
1154                 {
1155                 case 200:
1156                         printf("Running as '%s' by '%s'\n", gsEffectiveUser, pwd->pw_name);
1157                         break;
1158
1159                 case 403:
1160                         printf("Only coke members can use `dispense -u`\n");
1161                         free(buf);
1162                         return -1;
1163
1164                 case 404:
1165                         printf("Invalid user selected\n");
1166                         free(buf);
1167                         return -1;
1168
1169                 default:
1170                         fprintf(stderr, "Unkown response code %i from server\n", responseCode);
1171                         printf("%s\n", buf);
1172                         free(buf);
1173                         exit(-1);
1174                 }
1175
1176                 free(buf);
1177         }
1178
1179         gbIsAuthenticated = 1;
1180
1181         return 0;
1182 }
1183
1184 int GetUserBalance(int Socket)
1185 {
1186         regmatch_t      matches[6];
1187         struct passwd   *pwd;
1188         char    *buf;
1189          int    responseCode;
1190
1191         if( !gsUserName )
1192         {
1193                 if( gsEffectiveUser ) {
1194                         gsUserName = gsEffectiveUser;
1195                 }
1196                 else {
1197                         pwd = getpwuid( getuid() );
1198                         gsUserName = strdup(pwd->pw_name);
1199                 }
1200         }
1201
1202         sendf(Socket, "USER_INFO %s\n", gsUserName);
1203         buf = ReadLine(Socket);
1204         responseCode = atoi(buf);
1205         switch(responseCode)
1206         {
1207         case 202:       break;  // Ok
1208
1209         case 404:
1210                 printf("Invalid user? (USER_INFO failed)\n");
1211                 free(buf);
1212                 return -1;
1213
1214         default:
1215                 fprintf(stderr, "Unkown response code %i from server\n", responseCode);
1216                 printf("%s\n", buf);
1217                 free(buf);
1218                 exit(-1);
1219         }
1220
1221         RunRegex(&gUserInfoRegex, buf, 6, matches, "Malformed server response");
1222
1223         giUserBalance = atoi( buf + matches[4].rm_so );
1224         gsUserFlags = strdup( buf + matches[5].rm_so );
1225
1226         free(buf);
1227
1228         return 0;
1229 }
1230
1231 /**
1232  * \brief Read an item info response from the server
1233  * \param Dest  Destination for the read item (strings will be on the heap)
1234  */
1235 int ReadItemInfo(int Socket, tItem *Dest)
1236 {
1237         char    *buf;
1238          int    responseCode;
1239
1240         regmatch_t      matches[8];
1241         char    *statusStr;
1242
1243         // Get item info
1244         buf = ReadLine(Socket);
1245         responseCode = atoi(buf);
1246
1247         switch(responseCode)
1248         {
1249         case 202:       break;
1250
1251         case 406:
1252                 printf("Bad item name\n");
1253                 free(buf);
1254                 return 1;
1255
1256         default:
1257                 fprintf(stderr, "Unknown response from dispense server (Response Code %i)\n%s", responseCode, buf);
1258                 exit(-1);
1259         }
1260
1261         RunRegex(&gItemRegex, buf, 8, matches, "Malformed server response");
1262
1263         buf[ matches[3].rm_eo ] = '\0';
1264         buf[ matches[5].rm_eo ] = '\0';
1265         buf[ matches[7].rm_eo ] = '\0';
1266
1267         statusStr = &buf[ matches[5].rm_so ];
1268
1269         Dest->ID = atoi( buf + matches[4].rm_so );
1270
1271         if( strcmp(statusStr, "avail") == 0 )
1272                 Dest->Status = 0;
1273         else if( strcmp(statusStr, "sold") == 0 )
1274                 Dest->Status = 1;
1275         else if( strcmp(statusStr, "error") == 0 )
1276                 Dest->Status = -1;
1277         else {
1278                 fprintf(stderr, "Unknown response from dispense server (status '%s')\n",
1279                         statusStr);
1280                 return 1;
1281         }
1282         Dest->Price = atoi( buf + matches[6].rm_so );
1283
1284         // Hack a little to reduce heap fragmentation
1285         {
1286                 char    tmpType[strlen(buf + matches[3].rm_so) + 1];
1287                 char    tmpDesc[strlen(buf + matches[7].rm_so) + 1];
1288                 strcpy(tmpType, buf + matches[3].rm_so);
1289                 strcpy(tmpDesc, buf + matches[7].rm_so);
1290                 free(buf);
1291                 Dest->Type = strdup( tmpType );
1292                 Dest->Desc = strdup( tmpDesc );
1293         }
1294
1295         return 0;
1296 }
1297
1298 /**
1299  * \brief Fill the item information structure
1300  * \return Boolean Failure
1301  */
1302 void PopulateItemList(int Socket)
1303 {
1304         char    *buf;
1305          int    responseCode;
1306
1307         char    *itemType, *itemStart;
1308          int    count, i;
1309         regmatch_t      matches[4];
1310
1311         // Ask server for stock list
1312         send(Socket, "ENUM_ITEMS\n", 11, 0);
1313         buf = ReadLine(Socket);
1314
1315         //printf("Output: %s\n", buf);
1316
1317         responseCode = atoi(buf);
1318         if( responseCode != 201 ) {
1319                 fprintf(stderr, "Unknown response from dispense server (Response Code %i)\n", responseCode);
1320                 exit(-1);
1321         }
1322
1323         // - Get item list -
1324
1325         // Expected format:
1326         //  201 Items <count>
1327         //  202 Item <count>
1328         RunRegex(&gArrayRegex, buf, 4, matches, "Malformed server response");
1329
1330         itemType = &buf[ matches[2].rm_so ];    buf[ matches[2].rm_eo ] = '\0';
1331         count = atoi( &buf[ matches[3].rm_so ] );
1332
1333         // Check array type
1334         if( strcmp(itemType, "Items") != 0 ) {
1335                 // What the?!
1336                 fprintf(stderr, "Unexpected array type, expected 'Items', got '%s'\n",
1337                         itemType);
1338                 exit(-1);
1339         }
1340
1341         itemStart = &buf[ matches[3].rm_eo ];
1342
1343         free(buf);
1344
1345         giNumItems = count;
1346         gaItems = malloc( giNumItems * sizeof(tItem) );
1347
1348         // Fetch item information
1349         for( i = 0; i < giNumItems; i ++ )
1350         {
1351                 ReadItemInfo( Socket, &gaItems[i] );
1352         }
1353
1354         // Read end of list
1355         buf = ReadLine(Socket);
1356         responseCode = atoi(buf);
1357
1358         if( responseCode != 200 ) {
1359                 fprintf(stderr, "Unknown response from dispense server %i\n'%s'",
1360                         responseCode, buf
1361                         );
1362                 exit(-1);
1363         }
1364
1365         free(buf);
1366 }
1367
1368
1369 /**
1370  * \brief Get information on an item
1371  * \return Boolean Failure
1372  */
1373 int Dispense_ItemInfo(int Socket, const char *Type, int ID)
1374 {
1375         tItem   item;
1376
1377         // Query
1378         sendf(Socket, "ITEM_INFO %s:%i\n", Type, ID);
1379
1380         if( ReadItemInfo(Socket, &item) )
1381         {
1382                 return -1;
1383         }
1384
1385         printf("%8s:%-2i %2i.%02i %s\n",
1386                 item.Type, item.ID,
1387                 item.Price/100, item.Price%100,
1388                 item.Desc);
1389
1390         free(item.Type);
1391         free(item.Desc);
1392
1393         return 0;
1394 }
1395
1396 /**
1397  * \brief Dispense an item
1398  * \return Boolean Failure
1399  */
1400 int DispenseItem(int Socket, const char *Type, int ID)
1401 {
1402          int    ret, responseCode;
1403         char    *buf;
1404
1405         // Check for a dry run
1406         if( gbDryRun ) {
1407                 printf("Dry Run - No action\n");
1408                 return 0;
1409         }
1410
1411         // Dispense!
1412         sendf(Socket, "DISPENSE %s:%i\n", Type, ID);
1413         buf = ReadLine(Socket);
1414
1415         responseCode = atoi(buf);
1416         switch( responseCode )
1417         {
1418         case 200:
1419                 printf("Dispense OK\n");
1420                 ret = 0;
1421                 break;
1422         case 401:
1423                 printf("Not authenticated\n");
1424                 ret = 1;
1425                 break;
1426         case 402:
1427                 printf("Insufficient balance\n");
1428                 ret = 1;
1429                 break;
1430         case 406:
1431                 printf("Bad item name\n");
1432                 ret = 1;
1433                 break;
1434         case 500:
1435                 printf("Item failed to dispense, is the slot empty?\n");
1436                 ret = 1;
1437                 break;
1438         case 501:
1439                 printf("Dispense not possible (slot empty/permissions)\n");
1440                 ret = 1;
1441                 break;
1442         default:
1443                 printf("Unknown response code %i ('%s')\n", responseCode, buf);
1444                 ret = -2;
1445                 break;
1446         }
1447
1448         free(buf);
1449         return ret;
1450 }
1451
1452 /**
1453  * \brief Alter a user's balance
1454  */
1455 int Dispense_AlterBalance(int Socket, const char *Username, int Ammount, const char *Reason)
1456 {
1457         char    *buf;
1458          int    responseCode;
1459
1460         // Check for a dry run
1461         if( gbDryRun ) {
1462                 printf("Dry Run - No action\n");
1463                 return 0;
1464         }
1465
1466         sendf(Socket, "ADD %s %i %s\n", Username, Ammount, Reason);
1467         buf = ReadLine(Socket);
1468
1469         responseCode = atoi(buf);
1470         free(buf);
1471
1472         switch(responseCode)
1473         {
1474         case 200:       return 0;       // OK
1475         case 402:
1476                 fprintf(stderr, "Insufficient balance\n");
1477                 return 1;
1478         case 403:       // Not in coke
1479                 fprintf(stderr, "You are not in coke (sucker)\n");
1480                 return 1;
1481         case 404:       // Unknown user
1482                 fprintf(stderr, "Unknown user '%s'\n", Username);
1483                 return 2;
1484         default:
1485                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1486                 return -1;
1487         }
1488
1489         return -1;
1490 }
1491
1492 /**
1493  * \brief Set a user's balance
1494  * \note Only avaliable to dispense admins
1495  */
1496 int Dispense_SetBalance(int Socket, const char *Username, int Balance, const char *Reason)
1497 {
1498         char    *buf;
1499          int    responseCode;
1500
1501         // Check for a dry run
1502         if( gbDryRun ) {
1503                 printf("Dry Run - No action\n");
1504                 return 0;
1505         }
1506
1507         sendf(Socket, "SET %s %i %s\n", Username, Balance, Reason);
1508         buf = ReadLine(Socket);
1509
1510         responseCode = atoi(buf);
1511         free(buf);
1512
1513         switch(responseCode)
1514         {
1515         case 200:       return 0;       // OK
1516         case 403:       // Not in coke
1517                 fprintf(stderr, "You are not an admin\n");
1518                 return 1;
1519         case 404:       // Unknown user
1520                 fprintf(stderr, "Unknown user '%s'\n", Username);
1521                 return 2;
1522         default:
1523                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1524                 return -1;
1525         }
1526
1527         return -1;
1528 }
1529
1530 /**
1531  * \brief Give money to another user
1532  */
1533 int Dispense_Give(int Socket, const char *Username, int Ammount, const char *Reason)
1534 {
1535         char    *buf;
1536          int    responseCode;
1537
1538         if( Ammount < 0 ) {
1539                 printf("Sorry, you can only give, you can't take.\n");
1540                 return -1;
1541         }
1542
1543         // Fast return on zero
1544         if( Ammount == 0 ) {
1545                 printf("Are you actually going to give any?\n");
1546                 return 0;
1547         }
1548
1549         // Check for a dry run
1550         if( gbDryRun ) {
1551                 printf("Dry Run - No action\n");
1552                 return 0;
1553         }
1554
1555         sendf(Socket, "GIVE %s %i %s\n", Username, Ammount, Reason);
1556         buf = ReadLine(Socket);
1557
1558         responseCode = atoi(buf);
1559         free(buf);
1560
1561         switch(responseCode)
1562         {
1563         case 200:
1564                 printf("Give succeeded\n");
1565                 return 0;       // OK
1566
1567         case 402:
1568                 fprintf(stderr, "Insufficient balance\n");
1569                 return 1;
1570
1571         case 404:       // Unknown user
1572                 fprintf(stderr, "Unknown user '%s'\n", Username);
1573                 return 2;
1574
1575         default:
1576                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1577                 return -1;
1578         }
1579
1580         return -1;
1581 }
1582
1583
1584 /**
1585  * \brief Donate money to the club
1586  */
1587 int Dispense_Donate(int Socket, int Ammount, const char *Reason)
1588 {
1589         char    *buf;
1590          int    responseCode;
1591
1592         if( Ammount < 0 ) {
1593                 printf("Sorry, you can only give, you can't take.\n");
1594                 return -1;
1595         }
1596
1597         // Fast return on zero
1598         if( Ammount == 0 ) {
1599                 printf("Are you actually going to give any?\n");
1600                 return 0;
1601         }
1602
1603         // Check for a dry run
1604         if( gbDryRun ) {
1605                 printf("Dry Run - No action\n");
1606                 return 0;
1607         }
1608
1609         sendf(Socket, "DONATE %i %s\n", Ammount, Reason);
1610         buf = ReadLine(Socket);
1611
1612         responseCode = atoi(buf);
1613         free(buf);
1614
1615         switch(responseCode)
1616         {
1617         case 200:       return 0;       // OK
1618
1619         case 402:
1620                 fprintf(stderr, "Insufficient balance\n");
1621                 return 1;
1622
1623         default:
1624                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1625                 return -1;
1626         }
1627
1628         return -1;
1629 }
1630
1631 /**
1632  * \brief Enumerate users
1633  */
1634 int Dispense_EnumUsers(int Socket)
1635 {
1636         char    *buf;
1637          int    responseCode;
1638          int    nUsers;
1639         regmatch_t      matches[4];
1640
1641         if( giMinimumBalance != INT_MIN ) {
1642                 if( giMaximumBalance != INT_MAX ) {
1643                         sendf(Socket, "ENUM_USERS min_balance:%i max_balance:%i\n", giMinimumBalance, giMaximumBalance);
1644                 }
1645                 else {
1646                         sendf(Socket, "ENUM_USERS min_balance:%i\n", giMinimumBalance);
1647                 }
1648         }
1649         else {
1650                 if( giMaximumBalance != INT_MAX ) {
1651                         sendf(Socket, "ENUM_USERS max_balance:%i\n", giMaximumBalance);
1652                 }
1653                 else {
1654                         sendf(Socket, "ENUM_USERS\n");
1655                 }
1656         }
1657         buf = ReadLine(Socket);
1658         responseCode = atoi(buf);
1659
1660         switch(responseCode)
1661         {
1662         case 201:       break;  // Ok, length follows
1663
1664         default:
1665                 fprintf(stderr, "Unknown response code %i\n%s\n", responseCode, buf);
1666                 free(buf);
1667                 return -1;
1668         }
1669
1670         // Get count (not actually used)
1671         RunRegex(&gArrayRegex, buf, 4, matches, "Malformed server response");
1672         nUsers = atoi( buf + matches[3].rm_so );
1673         printf("%i users returned\n", nUsers);
1674
1675         // Free string
1676         free(buf);
1677
1678         // Read returned users
1679         do {
1680                 buf = ReadLine(Socket);
1681                 responseCode = atoi(buf);
1682
1683                 if( responseCode != 202 )       break;
1684
1685                 _PrintUserLine(buf);
1686                 free(buf);
1687         } while(responseCode == 202);
1688
1689         // Check final response
1690         if( responseCode != 200 ) {
1691                 fprintf(stderr, "Unknown response code %i\n%s\n", responseCode, buf);
1692                 free(buf);
1693                 return -1;
1694         }
1695
1696         free(buf);
1697
1698         return 0;
1699 }
1700
1701 int Dispense_ShowUser(int Socket, const char *Username)
1702 {
1703         char    *buf;
1704          int    responseCode, ret;
1705
1706         sendf(Socket, "USER_INFO %s\n", Username);
1707         buf = ReadLine(Socket);
1708
1709         responseCode = atoi(buf);
1710
1711         switch(responseCode)
1712         {
1713         case 202:
1714                 _PrintUserLine(buf);
1715                 ret = 0;
1716                 break;
1717
1718         case 404:
1719                 printf("Unknown user '%s'\n", Username);
1720                 ret = 1;
1721                 break;
1722
1723         default:
1724                 fprintf(stderr, "Unknown response code %i '%s'\n", responseCode, buf);
1725                 ret = -1;
1726                 break;
1727         }
1728
1729         free(buf);
1730
1731         return ret;
1732 }
1733
1734 void _PrintUserLine(const char *Line)
1735 {
1736         regmatch_t      matches[6];
1737          int    bal;
1738
1739         RunRegex(&gUserInfoRegex, Line, 6, matches, "Malformed server response");
1740         // 3: Username
1741         // 4: Balance
1742         // 5: Flags
1743         {
1744                  int    usernameLen = matches[3].rm_eo - matches[3].rm_so;
1745                 char    username[usernameLen + 1];
1746                  int    flagsLen = matches[5].rm_eo - matches[5].rm_so;
1747                 char    flags[flagsLen + 1];
1748
1749                 memcpy(username, Line + matches[3].rm_so, usernameLen);
1750                 username[usernameLen] = '\0';
1751                 memcpy(flags, Line + matches[5].rm_so, flagsLen);
1752                 flags[flagsLen] = '\0';
1753
1754                 bal = atoi(Line + matches[4].rm_so);
1755                 printf("%-15s: $%4i.%02i (%s)\n", username, bal/100, abs(bal)%100, flags);
1756         }
1757 }
1758
1759 int Dispense_AddUser(int Socket, const char *Username)
1760 {
1761         char    *buf;
1762          int    responseCode, ret;
1763
1764         // Check for a dry run
1765         if( gbDryRun ) {
1766                 printf("Dry Run - No action\n");
1767                 return 0;
1768         }
1769
1770         sendf(Socket, "USER_ADD %s\n", Username);
1771
1772         buf = ReadLine(Socket);
1773         responseCode = atoi(buf);
1774
1775         switch(responseCode)
1776         {
1777         case 200:
1778                 printf("User '%s' added\n", Username);
1779                 ret = 0;
1780                 break;
1781
1782         case 403:
1783                 printf("Only wheel can add users\n");
1784                 ret = 1;
1785                 break;
1786
1787         case 404:
1788                 printf("User '%s' already exists\n", Username);
1789                 ret = 0;
1790                 break;
1791
1792         default:
1793                 fprintf(stderr, "Unknown response code %i '%s'\n", responseCode, buf);
1794                 ret = -1;
1795                 break;
1796         }
1797
1798         free(buf);
1799
1800         return ret;
1801 }
1802
1803 int Dispense_SetUserType(int Socket, const char *Username, const char *TypeString)
1804 {
1805         char    *buf;
1806          int    responseCode, ret;
1807
1808         // Check for a dry run
1809         if( gbDryRun ) {
1810                 printf("Dry Run - No action\n");
1811                 return 0;
1812         }
1813
1814         // TODO: Pre-validate the string
1815
1816         sendf(Socket, "USER_FLAGS %s %s\n", Username, TypeString);
1817
1818         buf = ReadLine(Socket);
1819         responseCode = atoi(buf);
1820
1821         switch(responseCode)
1822         {
1823         case 200:
1824                 printf("User '%s' updated\n", Username);
1825                 ret = 0;
1826                 break;
1827
1828         case 403:
1829                 printf("Only wheel can modify users\n");
1830                 ret = 1;
1831                 break;
1832
1833         case 404:
1834                 printf("User '%s' does not exist\n", Username);
1835                 ret = 0;
1836                 break;
1837
1838         case 407:
1839                 printf("Flag string is invalid\n");
1840                 ret = 0;
1841                 break;
1842
1843         default:
1844                 fprintf(stderr, "Unknown response code %i '%s'\n", responseCode, buf);
1845                 ret = -1;
1846                 break;
1847         }
1848
1849         free(buf);
1850
1851         return ret;
1852 }
1853
1854 // ---------------
1855 // --- Helpers ---
1856 // ---------------
1857 char *ReadLine(int Socket)
1858 {
1859         static char     buf[BUFSIZ];
1860         static int      bufPos = 0;
1861         static int      bufValid = 0;
1862          int    len;
1863         char    *newline = NULL;
1864          int    retLen = 0;
1865         char    *ret = malloc(10);
1866
1867         #if DEBUG_TRACE_SERVER
1868         printf("ReadLine: ");
1869         #endif
1870         fflush(stdout);
1871
1872         ret[0] = '\0';
1873
1874         while( !newline )
1875         {
1876                 if( bufValid ) {
1877                         len = bufValid;
1878                 }
1879                 else {
1880                         len = recv(Socket, buf+bufPos, BUFSIZ-1-bufPos, 0);
1881                         buf[bufPos+len] = '\0';
1882                 }
1883
1884                 newline = strchr( buf+bufPos, '\n' );
1885                 if( newline ) {
1886                         *newline = '\0';
1887                 }
1888
1889                 retLen += strlen(buf+bufPos);
1890                 ret = realloc(ret, retLen + 1);
1891                 strcat( ret, buf+bufPos );
1892
1893                 if( newline ) {
1894                          int    newLen = newline - (buf+bufPos) + 1;
1895                         bufValid = len - newLen;
1896                         bufPos += newLen;
1897                 }
1898                 if( len + bufPos == BUFSIZ - 1 )        bufPos = 0;
1899         }
1900
1901         #if DEBUG_TRACE_SERVER
1902         printf("%i '%s'\n", retLen, ret);
1903         #endif
1904
1905         return ret;
1906 }
1907
1908 int sendf(int Socket, const char *Format, ...)
1909 {
1910         va_list args;
1911          int    len;
1912
1913         va_start(args, Format);
1914         len = vsnprintf(NULL, 0, Format, args);
1915         va_end(args);
1916
1917         {
1918                 char    buf[len+1];
1919                 va_start(args, Format);
1920                 vsnprintf(buf, len+1, Format, args);
1921                 va_end(args);
1922
1923                 #if DEBUG_TRACE_SERVER
1924                 printf("sendf: %s", buf);
1925                 #endif
1926
1927                 return send(Socket, buf, len, 0);
1928         }
1929 }
1930
1931 char *trim(char *string)
1932 {
1933          int    i;
1934
1935         while( isspace(*string) )
1936                 string ++;
1937
1938         for( i = strlen(string); i--; )
1939         {
1940                 if( isspace(string[i]) )
1941                         string[i] = '\0';
1942                 else
1943                         break;
1944         }
1945
1946         return string;
1947 }
1948
1949 int RunRegex(regex_t *regex, const char *string, int nMatches, regmatch_t *matches, const char *errorMessage)
1950 {
1951          int    ret;
1952
1953         ret = regexec(regex, string, nMatches, matches, 0);
1954         if( ret && errorMessage ) {
1955                 size_t  len = regerror(ret, regex, NULL, 0);
1956                 char    errorStr[len];
1957                 regerror(ret, regex, errorStr, len);
1958                 printf("string = '%s'\n", string);
1959                 fprintf(stderr, "%s\n%s", errorMessage, errorStr);
1960                 exit(-1);
1961         }
1962
1963         return ret;
1964 }
1965
1966 void CompileRegex(regex_t *regex, const char *pattern, int flags)
1967 {
1968          int    ret = regcomp(regex, pattern, flags);
1969         if( ret ) {
1970                 size_t  len = regerror(ret, regex, NULL, 0);
1971                 char    errorStr[len];
1972                 regerror(ret, regex, errorStr, len);
1973                 fprintf(stderr, "Regex compilation failed - %s\n", errorStr);
1974                 exit(-1);
1975         }
1976 }