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
  31 // === TYPES ===
  32 typedef struct sItem {
  33         char    *Type;
  34          int    ID;
  35         char    *Desc;
  36          int    Price;
  37 }       tItem;
  38
  39 // === PROTOTYPES ===
  40  int    main(int argc, char *argv[]);
  41 void    ShowUsage(void);
  42 // --- GUI ---
  43  int    ShowNCursesUI(void);
  44 void    ShowItemAt(int Row, int Col, int Width, int Index);
  45 void    PrintAlign(int Row, int Col, int Width, const char *Left, char Pad1, const char *Mid, char Pad2, const char *Right, ...);
  46 // --- Coke Server Communication ---
  47  int    OpenConnection(const char *Host, int Port);
  48  int    Authenticate(int Socket);
  49 void    PopulateItemList(int Socket);
  50  int    DispenseItem(int Socket, int ItemID);
  51  int    Dispense_AlterBalance(int Socket, const char *Username, int Ammount, const char *Reason);
  52  int    Dispense_SetBalance(int Socket, const char *Username, int Balance, const char *Reason);
  53  int    Dispense_Give(int Socket, const char *Username, int Ammount, const char *Reason);
  54  int    Dispense_Donate(int Socket, int Ammount, const char *Reason);
  55  int    Dispense_EnumUsers(int Socket);
  56  int    Dispense_ShowUser(int Socket, const char *Username);
  57 void    _PrintUserLine(const char *Line);
  58  int    Dispense_AddUser(int Socket, const char *Username);
  59  int    Dispense_SetUserType(int Socket, const char *Username, const char *TypeString);
  60 // --- Helpers ---
  61 char    *ReadLine(int Socket);
  62  int    sendf(int Socket, const char *Format, ...);
  63 char    *trim(char *string);
  64  int    RunRegex(regex_t *regex, const char *string, int nMatches, regmatch_t *matches, const char *errorMessage);
  65 void    CompileRegex(regex_t *regex, const char *pattern, int flags);
  66
  67 // === GLOBALS ===
  68 char    *gsDispenseServer = "localhost";
  69  int    giDispensePort = 11020;
  70
  71 tItem   *gaItems;
  72  int    giNumItems;
  73 regex_t gArrayRegex, gItemRegex, gSaltRegex, gUserInfoRegex;
  74  int    gbIsAuthenticated = 0;
  75
  76 char    *gsItemPattern; //!< Item pattern
  77 char    *gsEffectiveUser;       //!< '-u' Dispense as another user
  78  int    gbUseNCurses = 0;       //!< '-G' Use the NCurses GUI?
  79  int    giMinimumBalance = INT_MIN;     //!< '-m' Minumum balance for `dispense acct`
  80  int    giMaximumBalance = INT_MAX;     //!< '-M' Maximum balance for `dispense acct`
  81
  82 // === CODE ===
  83 int main(int argc, char *argv[])
  84 {
  85          int    sock;
  86          int    i;
  87         char    buffer[BUFSIZ];
  88
  89         // -- Create regular expressions
  90         // > Code Type Count ...
  91         CompileRegex(&gArrayRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+([0-9]+)", REG_EXTENDED);     //
  92         // > Code Type Ident Price Desc
  93         CompileRegex(&gItemRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+([A-Za-z]+):([0-9]+)\\s+([0-9]+)\\s+(.+)$", REG_EXTENDED);
  94         // > Code 'SALT' salt
  95         CompileRegex(&gSaltRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+(.+)$", REG_EXTENDED);
  96         // > Code 'User' Username Balance Flags
  97         CompileRegex(&gUserInfoRegex, "^([0-9]{3})\\s+([A-Za-z]+)\\s+([^ ]+)\\s+(-?[0-9]+)\\s+(.+)$", REG_EXTENDED);
  98
  99         // Parse Arguments
 100         for( i = 1; i < argc; i ++ )
 101         {
 102                 char    *arg = argv[i];
 103
 104                 if( arg[0] == '-' )
 105                 {
 106                         switch(arg[1])
 107                         {
 108                         case 'h':
 109                         case '?':
 110                                 ShowUsage();
 111                                 return 0;
 112
 113                         case 'm':       // Minimum balance
 114                                 giMinimumBalance = atoi(argv[++i]);
 115                                 break;
 116                         case 'M':       // Maximum balance
 117                                 giMaximumBalance = atoi(argv[++i]);
 118                                 break;
 119
 120                         case 'u':       // Override User
 121                                 gsEffectiveUser = argv[++i];
 122                                 break;
 123
 124                         case 'G':       // Use GUI
 125                                 gbUseNCurses = 1;
 126                                 break;
 127                         }
 128
 129                         continue;
 130                 }
 131
 132                 //
 133                 // `dispense acct`
 134                 // -
 135                 if( strcmp(arg, "acct") == 0 )
 136                 {
 137                         // Connect to server
 138                         sock = OpenConnection(gsDispenseServer, giDispensePort);
 139                         if( sock < 0 )  return -1;
 140
 141                         // List accounts?
 142                         if( i + 1 == argc ) {
 143                                 Dispense_EnumUsers(sock);
 144                                 return 0;
 145                         }
 146
 147                         // argv[i+1]: Username
 148
 149                         // Alter account?
 150                         if( i + 2 < argc )
 151                         {
 152                                 if( i + 3 >= argc ) {
 153                                         fprintf(stderr, "Error: `dispense acct' needs a reason\n");
 154                                         exit(1);
 155                                 }
 156
 157                                 // Authentication required
 158                                 if( Authenticate(sock) )
 159                                         return -1;
 160
 161                                 // argv[i+1]: Username
 162                                 // argv[i+2]: Ammount
 163                                 // argv[i+3]: Reason
 164
 165                                 if( argv[i+2][0] == '=' ) {
 166                                         // Set balance
 167                                         if( argv[i+2][1] != '0' && atoi(&argv[i+2][1]) == 0 ) {
 168                                                 fprintf(stderr, "Error: Invalid balance to be set\n");
 169                                                 exit(1);
 170                                         }
 171
 172                                         Dispense_SetBalance(sock, argv[i+1], atoi(argv[i+2]+1), argv[i+3]);
 173                                 }
 174                                 else {
 175                                         // Alter balance
 176                                         Dispense_AlterBalance(sock, argv[i+1], atoi(argv[i+2]), argv[i+3]);
 177                                 }
 178                         }
 179
 180                         // Show user information
 181                         Dispense_ShowUser(sock, argv[i+1]);
 182
 183                         close(sock);
 184                         return 0;
 185                 }
 186                 //
 187                 // `dispense give`
 188                 // - "Here, have some money."
 189                 if( strcmp(arg, "give") == 0 )
 190                 {
 191                         if( i + 3 >= argc ) {
 192                                 fprintf(stderr, "`dispense give` takes three arguments\n");
 193                                 ShowUsage();
 194                                 return -1;
 195                         }
 196                         // TODO: `dispense give`
 197
 198                         // argv[i+1]: Destination
 199                         // argv[i+2]: Ammount
 200                         // argv[i+3]: Reason
 201
 202                         // Connect to server
 203                         sock = OpenConnection(gsDispenseServer, giDispensePort);
 204                         if( sock < 0 )  return -1;
 205
 206                         // Authenticate
 207                         if( Authenticate(sock) )
 208                                 return -1;
 209
 210                         Dispense_Give(sock, argv[i+1], atoi(argv[i+2]), argv[i+3]);
 211                         return 0;
 212                 }
 213                 //
 214                 // `dispense user`
 215                 // - User administration (Admin Only)
 216                 if( strcmp(arg, "user") == 0 )
 217                 {
 218                         // Check argument count
 219                         if( i + 1 >= argc ) {
 220                                 fprintf(stderr, "Error: `dispense user` requires arguments\n");
 221                                 ShowUsage();
 222                                 exit(1);
 223                         }
 224
 225                         // Connect to server
 226                         sock = OpenConnection(gsDispenseServer, giDispensePort);
 227                         if( sock < 0 )  return -1;
 228
 229                         // Attempt authentication
 230                         if( Authenticate(sock) )
 231                                 return -1;
 232
 233                         // Add new user?
 234                         if( strcmp(argv[i+1], "add") == 0 )
 235                         {
 236                                 if( i + 2 >= argc ) {
 237                                         fprintf(stderr, "Error: `dispense user add` requires an argument\n");
 238                                         ShowUsage();
 239                                         exit(1);
 240                                 }
 241
 242                                 Dispense_AddUser(sock, argv[i+2]);
 243                         }
 244                         // Update a user
 245                         else if( strcmp(argv[i+1], "type") == 0 )
 246                         {
 247                                 if( i + 3 >= argc ) {
 248                                         fprintf(stderr, "Error: `dispense user type` requires two arguments\n");
 249                                         ShowUsage();
 250                                         exit(1);
 251                                 }
 252
 253                                 Dispense_SetUserType(sock, argv[i+2], argv[i+3]);
 254                         }
 255                         else
 256                         {
 257                                 fprintf(stderr, "Error: Unknown sub-command for `dispense user`\n");
 258                                 ShowUsage();
 259                                 exit(1);
 260                         }
 261                         return 0;
 262                 }
 263
 264                 // Donation!
 265                 if( strcmp(arg, "donate") == 0 )
 266                 {
 267                         // Check argument count
 268                         if( i + 2 >= argc ) {
 269                                 fprintf(stderr, "Error: `dispense donate` requires two arguments\n");
 270                                 ShowUsage();
 271                                 exit(1);
 272                         }
 273
 274                         // Connect to server
 275                         sock = OpenConnection(gsDispenseServer, giDispensePort);
 276                         if( sock < 0 )  return -1;
 277
 278                         // Attempt authentication
 279                         if( Authenticate(sock) )
 280                                 return -1;
 281
 282                         // Do donation
 283                         Dispense_Donate(sock, atoi(argv[i+1]), argv[i+1]);
 284
 285                         return 0;
 286                 }
 287
 288                 else {
 289                         // Item name / pattern
 290                         gsItemPattern = arg;
 291                         break;
 292                 }
 293         }
 294
 295         // Connect to server
 296         sock = OpenConnection(gsDispenseServer, giDispensePort);
 297         if( sock < 0 )  return -1;
 298
 299         // Get items
 300         PopulateItemList(sock);
 301
 302         // Disconnect from server
 303         close(sock);
 304
 305         if( gsItemPattern )
 306         {
 307                 // TODO: Implement `dispense <name>`
 308                 printf("TODO: Implement `dispense <name>`\n");
 309                 i = -1;
 310         }
 311         else if( gbUseNCurses )
 312         {
 313                 i = ShowNCursesUI();
 314         }
 315         else
 316         {
 317                 // Very basic dispense interface
 318                 for( i = 0; i < giNumItems; i ++ ) {
 319                         printf("%2i %s:%i\t%3i %s\n", i, gaItems[i].Type, gaItems[i].ID,
 320                                 gaItems[i].Price, gaItems[i].Desc);
 321                 }
 322                 printf(" q Quit\n");
 323                 for(;;)
 324                 {
 325                         char    *buf;
 326
 327                         i = -1;
 328
 329                         fgets(buffer, BUFSIZ, stdin);
 330
 331                         buf = trim(buffer);
 332
 333                         if( buf[0] == 'q' )     break;
 334
 335                         i = atoi(buf);
 336
 337                         if( i != 0 || buf[0] == '0' )
 338                         {
 339                                 if( i < 0 || i >= giNumItems ) {
 340                                         printf("Bad item %i (should be between 0 and %i)\n", i, giNumItems);
 341                                         continue;
 342                                 }
 343                                 break;
 344                         }
 345                 }
 346         }
 347
 348
 349         // Connect to server again
 350         sock = OpenConnection(gsDispenseServer, giDispensePort);
 351         if( sock < 0 )  return -1;
 352
 353         // Authenticate
 354         Authenticate(sock);
 355
 356         // Check for a valid item ID
 357         if( i >= 0 )
 358                 DispenseItem(sock, i);
 359
 360         close(sock);
 361
 362         return 0;
 363 }
 364
 365 void ShowUsage(void)
 366 {
 367         printf(
 368                 "Usage:\n"
 369                 "  == Everyone ==\n"
 370                 "    dispense\n"
 371                 "        Show interactive list\n"
 372                 "    dispense <item>\n"
 373                 "        Dispense named item\n"
 374                 "    dispense give <user> <ammount> \"<reason>\"\n"
 375                 "        Give money to another user\n"
 376                 "    dispense donate <ammount> \"<reason>\"\n"
 377                 "        Donate to the club\n"
 378                 "  == Coke members == \n"
 379                 "    dispense acct [<user>]\n"
 380                 "        Show user balances\n"
 381                 "    dispense acct <user> [+-]<ammount> \"<reason>\"\n"
 382                 "        Alter a account value\n"
 383                 "  == Dispense administrators ==\n"
 384                 "    dispense acct <user> =<ammount> \"<reason>\"\n"
 385                 "        Set an account balance\n"
 386                 "    dispense user add <user>\n"
 387                 "        Create new coke account (Admins only)\n"
 388                 "    dispense user type <user> <flags>\n"
 389                 "        Alter a user's flags\n"
 390                 "        <flags> is a comma-separated list of user, coke, admin or disabled\n"
 391                 "        Flags are removed by preceding the name with '-' or '!'\n"
 392                 "\n"
 393                 "General Options:\n"
 394                 "    -u <username>\n"
 395                 "        Set a different user (Coke members only)\n"
 396                 "    -h / -?\n"
 397                 "        Show help text\n"
 398                 "    -G\n"
 399                 "        Use alternate GUI\n"
 400                 "    -m <min balance>\n"
 401                 "    -M <max balance>\n"
 402                 "        Set the Maximum/Minimum balances shown in `dispense acct`\n"
 403                 );
 404 }
 405
 406 // -------------------
 407 // --- NCurses GUI ---
 408 // -------------------
 409 /**
 410  * \brief Render the NCurses UI
 411  */
 412 int ShowNCursesUI(void)
 413 {
 414         // TODO: ncurses interface (with separation between item classes)
 415         // - Hmm... that would require standardising the item ID to be <class>:<index>
 416         // Oh, why not :)
 417          int    ch;
 418          int    i, times;
 419          int    xBase, yBase;
 420         const int       displayMinWidth = 40;
 421         const int       displayMinItems = 8;
 422         char    *titleString = "Dispense";
 423          int    itemCount = displayMinItems;
 424          int    itemBase = 0;
 425          int    currentItem = 0;
 426          int    ret = -2;       // -2: Used for marking "no return yet"
 427
 428          int    height, width;
 429
 430         // Enter curses mode
 431         initscr();
 432         raw(); noecho();
 433
 434         // Get item count
 435         // - 6: randomly chosen (Need at least 3)
 436         itemCount = LINES - 6;
 437         if( itemCount > giNumItems )
 438                 itemCount = giNumItems;
 439
 440         // Get dimensions
 441         height = itemCount + 3;
 442         width = displayMinWidth;
 443
 444         // Get positions
 445         xBase = COLS/2 - width/2;
 446         yBase = LINES/2 - height/2;
 447
 448         for( ;; )
 449         {
 450                 // Header
 451                 PrintAlign(yBase, xBase, width, "/", '-', titleString, '-', "\\");
 452
 453                 // Items
 454                 for( i = 0; i < itemCount; i ++ )
 455                 {
 456                         move( yBase + 1 + i, xBase );
 457
 458                         if( currentItem == itemBase + i ) {
 459                                 printw("| -> ");
 460                         }
 461                         else {
 462                                 printw("|    ");
 463                         }
 464
 465                         // Check for ... row
 466                         // - Oh god, magic numbers!
 467                         if( i == 0 && itemBase > 0 ) {
 468                                 printw("   ...");
 469                                 times = width-1 - 8 - 3;
 470                                 while(times--)  addch(' ');
 471                         }
 472                         else if( i == itemCount - 1 && itemBase < giNumItems - itemCount ) {
 473                                 printw("   ...");
 474                                 times = width-1 - 8 - 3;
 475                                 while(times--)  addch(' ');
 476                         }
 477                         // Show an item
 478                         else {
 479                                 ShowItemAt( yBase + 1 + i, xBase + 5, width - 7, itemBase + i);
 480                                 addch(' ');
 481                         }
 482
 483                         // Scrollbar (if needed)
 484                         if( giNumItems > itemCount ) {
 485                                 if( i == 0 ) {
 486                                         addch('A');
 487                                 }
 488                                 else if( i == itemCount - 1 ) {
 489                                         addch('V');
 490                                 }
 491                                 else {
 492                                          int    percentage = itemBase * 100 / (giNumItems-itemCount);
 493                                         if( i-1 == percentage*(itemCount-3)/100 ) {
 494                                                 addch('#');
 495                                         }
 496                                         else {
 497                                                 addch('|');
 498                                         }
 499                                 }
 500                         }
 501                         else {
 502                                 addch('|');
 503                         }
 504                 }
 505
 506                 // Footer
 507                 PrintAlign(yBase+height-2, xBase, width, "\\", '-', "", '-', "/");
 508
 509                 // Get input
 510                 ch = getch();
 511
 512                 if( ch == '\x1B' ) {
 513                         ch = getch();
 514                         if( ch == '[' ) {
 515                                 ch = getch();
 516
 517                                 switch(ch)
 518                                 {
 519                                 case 'B':
 520                                         //if( itemBase < giNumItems - (itemCount) )
 521                                         //      itemBase ++;
 522                                         if( currentItem < giNumItems - 1 )
 523                                                 currentItem ++;
 524                                         if( itemBase + itemCount - 1 <= currentItem && itemBase + itemCount < giNumItems )
 525                                                 itemBase ++;
 526                                         break;
 527                                 case 'A':
 528                                         //if( itemBase > 0 )
 529                                         //      itemBase --;
 530                                         if( currentItem > 0 )
 531                                                 currentItem --;
 532                                         if( itemBase + 1 > currentItem && itemBase > 0 )
 533                                                 itemBase --;
 534                                         break;
 535                                 }
 536                         }
 537                         else {
 538
 539                         }
 540                 }
 541                 else {
 542                         switch(ch)
 543                         {
 544                         case '\n':
 545                                 ret = currentItem;
 546                                 break;
 547                         case 'q':
 548                                 ret = -1;       // -1: Return with no dispense
 549                                 break;
 550                         }
 551
 552                         // Check if the return value was changed
 553                         if( ret != -2 ) break;
 554                 }
 555
 556         }
 557
 558
 559         // Leave
 560         endwin();
 561         return ret;
 562 }
 563
 564 /**
 565  * \brief Show item \a Index at (\a Col, \a Row)
 566  * \note Part of the NCurses UI
 567  */
 568 void ShowItemAt(int Row, int Col, int Width, int Index)
 569 {
 570          int    _x, _y, times;
 571         char    *name;
 572          int    price;
 573
 574         move( Row, Col );
 575
 576         if( Index < 0 || Index >= giNumItems ) {
 577                 name = "OOR";
 578                 price = 0;
 579         }
 580         else {
 581                 name = gaItems[Index].Desc;
 582                 price = gaItems[Index].Price;
 583         }
 584
 585         printw("%02i %s", Index, name);
 586
 587         getyx(stdscr, _y, _x);
 588         // Assumes max 4 digit prices
 589         times = Width - 4 - (_x - Col); // TODO: Better handling for large prices
 590         while(times--)  addch(' ');
 591         printw("%4i", price);
 592 }
 593
 594 /**
 595  * \brief Print a three-part string at the specified position (formatted)
 596  * \note NCurses UI Helper
 597  *
 598  * Prints \a Left on the left of the area, \a Right on the righthand side
 599  * and \a Mid in the middle of the area. These are padded with \a Pad1
 600  * between \a Left and \a Mid, and \a Pad2 between \a Mid and \a Right.
 601  *
 602  * ::printf style format codes are allowed in \a Left, \a Mid and \a Right,
 603  * and the arguments to these are read in that order.
 604  */
 605 void PrintAlign(int Row, int Col, int Width, const char *Left, char Pad1,
 606         const char *Mid, char Pad2, const char *Right, ...)
 607 {
 608          int    lLen, mLen, rLen;
 609          int    times;
 610
 611         va_list args;
 612
 613         // Get the length of the strings
 614         va_start(args, Right);
 615         lLen = vsnprintf(NULL, 0, Left, args);
 616         mLen = vsnprintf(NULL, 0, Mid, args);
 617         rLen = vsnprintf(NULL, 0, Right, args);
 618         va_end(args);
 619
 620         // Sanity check
 621         if( lLen + mLen/2 > Width/2 || mLen/2 + rLen > Width/2 ) {
 622                 return ;        // TODO: What to do?
 623         }
 624
 625         move(Row, Col);
 626
 627         // Render strings
 628         va_start(args, Right);
 629         // - Left
 630         {
 631                 char    tmp[lLen+1];
 632                 vsnprintf(tmp, lLen+1, Left, args);
 633                 addstr(tmp);
 634         }
 635         // - Left padding
 636         times = Width/2 - mLen/2 - lLen;
 637         while(times--)  addch(Pad1);
 638         // - Middle
 639         {
 640                 char    tmp[mLen+1];
 641                 vsnprintf(tmp, mLen+1, Mid, args);
 642                 addstr(tmp);
 643         }
 644         // - Right Padding
 645         times = Width/2 - mLen/2 - rLen;
 646         while(times--)  addch(Pad2);
 647         // - Right
 648         {
 649                 char    tmp[rLen+1];
 650                 vsnprintf(tmp, rLen+1, Right, args);
 651                 addstr(tmp);
 652         }
 653 }
 654
 655 // ---------------------
 656 // --- Coke Protocol ---
 657 // ---------------------
 658 int OpenConnection(const char *Host, int Port)
 659 {
 660         struct hostent  *host;
 661         struct sockaddr_in      serverAddr;
 662          int    sock;
 663
 664         host = gethostbyname(Host);
 665         if( !host ) {
 666                 fprintf(stderr, "Unable to look up '%s'\n", Host);
 667                 return -1;
 668         }
 669
 670         memset(&serverAddr, 0, sizeof(serverAddr));
 671
 672         serverAddr.sin_family = AF_INET;        // IPv4
 673         // NOTE: I have a suspicion that IPv6 will play sillybuggers with this :)
 674         serverAddr.sin_addr.s_addr = *((unsigned long *) host->h_addr_list[0]);
 675         serverAddr.sin_port = htons(Port);
 676
 677         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 678         if( sock < 0 ) {
 679                 fprintf(stderr, "Failed to create socket\n");
 680                 return -1;
 681         }
 682
 683         #if USE_AUTOAUTH
 684         {
 685                 struct sockaddr_in      localAddr;
 686                 memset(&localAddr, 0, sizeof(localAddr));
 687                 localAddr.sin_family = AF_INET; // IPv4
 688                 localAddr.sin_port = 1023;      // IPv4
 689                 // Attempt to bind to low port for autoauth
 690                 bind(sock, &localAddr, sizeof(localAddr));
 691         }
 692         #endif
 693
 694         if( connect(sock, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0 ) {
 695                 fprintf(stderr, "Failed to connect to server\n");
 696                 return -1;
 697         }
 698
 699         return sock;
 700 }
 701
 702 /**
 703  * \brief Authenticate with the server
 704  * \return Boolean Failure
 705  */
 706 int Authenticate(int Socket)
 707 {
 708         struct passwd   *pwd;
 709         char    *buf;
 710          int    responseCode;
 711         char    salt[32];
 712          int    i;
 713         regmatch_t      matches[4];
 714
 715         if( gbIsAuthenticated ) return 0;
 716
 717         // Get user name
 718         pwd = getpwuid( getuid() );
 719
 720         // Attempt automatic authentication
 721         sendf(Socket, "AUTOAUTH %s\n", pwd->pw_name);
 722
 723         // Check if it worked
 724         buf = ReadLine(Socket);
 725
 726         responseCode = atoi(buf);
 727         switch( responseCode )
 728         {
 729         case 200:       // Autoauth succeeded, return
 730                 free(buf);
 731                 break;
 732
 733         case 401:       // Untrusted, attempt password authentication
 734                 free(buf);
 735
 736                 sendf(Socket, "USER %s\n", pwd->pw_name);
 737                 printf("Using username %s\n", pwd->pw_name);
 738
 739                 buf = ReadLine(Socket);
 740
 741                 // TODO: Get Salt
 742                 // Expected format: 100 SALT <something> ...
 743                 // OR             : 100 User Set
 744                 RunRegex(&gSaltRegex, buf, 4, matches, "Malformed server response");
 745                 responseCode = atoi(buf);
 746                 if( responseCode != 100 ) {
 747                         fprintf(stderr, "Unknown repsonse code %i from server\n%s\n", responseCode, buf);
 748                         free(buf);
 749                         return -1;      // ERROR
 750                 }
 751
 752                 // Check for salt
 753                 if( memcmp( buf+matches[2].rm_so, "SALT", matches[2].rm_eo - matches[2].rm_so) == 0) {
 754                         // Store it for later
 755                         memcpy( salt, buf + matches[3].rm_so, matches[3].rm_eo - matches[3].rm_so );
 756                         salt[ matches[3].rm_eo - matches[3].rm_so ] = 0;
 757                 }
 758                 free(buf);
 759
 760                 // Give three attempts
 761                 for( i = 0; i < 3; i ++ )
 762                 {
 763                          int    ofs = strlen(pwd->pw_name)+strlen(salt);
 764                         char    tmpBuf[42];
 765                         char    tmp[ofs+20];
 766                         char    *pass = getpass("Password: ");
 767                         uint8_t h[20];
 768
 769                         // Create hash string
 770                         // <username><salt><hash>
 771                         strcpy(tmp, pwd->pw_name);
 772                         strcat(tmp, salt);
 773                         SHA1( (unsigned char*)pass, strlen(pass), h );
 774                         memcpy(tmp+ofs, h, 20);
 775
 776                         // Hash all that
 777                         SHA1( (unsigned char*)tmp, ofs+20, h );
 778                         sprintf(tmpBuf, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
 779                                 h[ 0], h[ 1], h[ 2], h[ 3], h[ 4], h[ 5], h[ 6], h[ 7], h[ 8], h[ 9],
 780                                 h[10], h[11], h[12], h[13], h[14], h[15], h[16], h[17], h[18], h[19]
 781                                 );
 782
 783                         // Send password
 784                         sendf(Socket, "PASS %s\n", tmpBuf);
 785                         buf = ReadLine(Socket);
 786
 787                         responseCode = atoi(buf);
 788                         // Auth OK?
 789                         if( responseCode == 200 )       break;
 790                         // Bad username/password
 791                         if( responseCode == 401 )       continue;
 792
 793                         fprintf(stderr, "Unknown repsonse code %i from server\n%s\n", responseCode, buf);
 794                         free(buf);
 795                         return -1;
 796                 }
 797                 free(buf);
 798                 if( i == 3 )
 799                         return 2;       // 2 = Bad Password
 800                 break;
 801
 802         case 404:       // Bad Username
 803                 fprintf(stderr, "Bad Username '%s'\n", pwd->pw_name);
 804                 free(buf);
 805                 return 1;
 806
 807         default:
 808                 fprintf(stderr, "Unkown response code %i from server\n", responseCode);
 809                 printf("%s\n", buf);
 810                 free(buf);
 811                 return -1;
 812         }
 813
 814         // Set effective user
 815         if( gsEffectiveUser ) {
 816                 sendf(Socket, "SETEUSER %s\n", gsEffectiveUser);
 817
 818                 buf = ReadLine(Socket);
 819                 responseCode = atoi(buf);
 820
 821                 switch(responseCode)
 822                 {
 823                 case 200:
 824                         printf("Running as '%s' by '%s'\n", gsEffectiveUser, pwd->pw_name);
 825                         break;
 826
 827                 case 403:
 828                         printf("Only coke members can use `dispense -u`\n");
 829                         free(buf);
 830                         return -1;
 831
 832                 case 404:
 833                         printf("Invalid user selected\n");
 834                         free(buf);
 835                         return -1;
 836
 837                 default:
 838                         fprintf(stderr, "Unkown response code %i from server\n", responseCode);
 839                         printf("%s\n", buf);
 840                         free(buf);
 841                         exit(-1);
 842                 }
 843
 844                 free(buf);
 845         }
 846
 847         gbIsAuthenticated = 1;
 848
 849         return 0;
 850 }
 851
 852
 853 /**
 854  * \brief Fill the item information structure
 855  * \return Boolean Failure
 856  */
 857 void PopulateItemList(int Socket)
 858 {
 859         char    *buf;
 860          int    responseCode;
 861
 862         char    *itemType, *itemStart;
 863          int    count, i;
 864         regmatch_t      matches[4];
 865
 866         // Ask server for stock list
 867         send(Socket, "ENUM_ITEMS\n", 11, 0);
 868         buf = ReadLine(Socket);
 869
 870         //printf("Output: %s\n", buf);
 871
 872         responseCode = atoi(buf);
 873         if( responseCode != 201 ) {
 874                 fprintf(stderr, "Unknown response from dispense server (Response Code %i)\n", responseCode);
 875                 exit(-1);
 876         }
 877
 878         // - Get item list -
 879
 880         // Expected format:
 881         //  201 Items <count>
 882         //  202 Item <count>
 883         RunRegex(&gArrayRegex, buf, 4, matches, "Malformed server response");
 884
 885         itemType = &buf[ matches[2].rm_so ];    buf[ matches[2].rm_eo ] = '\0';
 886         count = atoi( &buf[ matches[3].rm_so ] );
 887
 888         // Check array type
 889         if( strcmp(itemType, "Items") != 0 ) {
 890                 // What the?!
 891                 fprintf(stderr, "Unexpected array type, expected 'Items', got '%s'\n",
 892                         itemType);
 893                 exit(-1);
 894         }
 895
 896         itemStart = &buf[ matches[3].rm_eo ];
 897
 898         free(buf);
 899
 900         giNumItems = count;
 901         gaItems = malloc( giNumItems * sizeof(tItem) );
 902
 903         // Fetch item information
 904         for( i = 0; i < giNumItems; i ++ )
 905         {
 906                 regmatch_t      matches[7];
 907
 908                 // Get item info
 909                 buf = ReadLine(Socket);
 910                 responseCode = atoi(buf);
 911
 912                 if( responseCode != 202 ) {
 913                         fprintf(stderr, "Unknown response from dispense server (Response Code %i)\n", responseCode);
 914                         exit(-1);
 915                 }
 916
 917                 RunRegex(&gItemRegex, buf, 7, matches, "Malformed server response");
 918
 919                 buf[ matches[3].rm_eo ] = '\0';
 920
 921                 gaItems[i].Type = strdup( buf + matches[3].rm_so );
 922                 gaItems[i].ID = atoi( buf + matches[4].rm_so );
 923                 gaItems[i].Price = atoi( buf + matches[5].rm_so );
 924                 gaItems[i].Desc = strdup( buf + matches[6].rm_so );
 925
 926                 free(buf);
 927         }
 928
 929         // Read end of list
 930         buf = ReadLine(Socket);
 931         responseCode = atoi(buf);
 932
 933         if( responseCode != 200 ) {
 934                 fprintf(stderr, "Unknown response from dispense server %i\n'%s'",
 935                         responseCode, buf
 936                         );
 937                 exit(-1);
 938         }
 939
 940         free(buf);
 941 }
 942
 943 /**
 944  * \brief Dispense an item
 945  * \return Boolean Failure
 946  */
 947 int DispenseItem(int Socket, int ItemID)
 948 {
 949          int    ret, responseCode;
 950         char    *buf;
 951
 952         if( ItemID < 0 || ItemID > giNumItems ) return -1;
 953
 954         // Dispense!
 955         sendf(Socket, "DISPENSE %s:%i\n", gaItems[ItemID].Type, gaItems[ItemID].ID);
 956         buf = ReadLine(Socket);
 957
 958         responseCode = atoi(buf);
 959         switch( responseCode )
 960         {
 961         case 200:
 962                 printf("Dispense OK\n");
 963                 ret = 0;
 964                 break;
 965         case 401:
 966                 printf("Not authenticated\n");
 967                 ret = 1;
 968                 break;
 969         case 402:
 970                 printf("Insufficient balance\n");
 971                 ret = 1;
 972                 break;
 973         case 406:
 974                 printf("Bad item name, bug report\n");
 975                 ret = 1;
 976                 break;
 977         case 500:
 978                 printf("Item failed to dispense, is the slot empty?\n");
 979                 ret = 1;
 980                 break;
 981         case 501:
 982                 printf("Dispense not possible (slot empty/permissions)\n");
 983                 ret = 1;
 984                 break;
 985         default:
 986                 printf("Unknown response code %i ('%s')\n", responseCode, buf);
 987                 ret = -2;
 988                 break;
 989         }
 990
 991         free(buf);
 992         return ret;
 993 }
 994
 995 /**
 996  * \brief Alter a user's balance
 997  */
 998 int Dispense_AlterBalance(int Socket, const char *Username, int Ammount, const char *Reason)
 999 {
1000         char    *buf;
1001          int    responseCode;
1002
1003         sendf(Socket, "ADD %s %i %s\n", Username, Ammount, Reason);
1004         buf = ReadLine(Socket);
1005
1006         responseCode = atoi(buf);
1007         free(buf);
1008
1009         switch(responseCode)
1010         {
1011         case 200:       return 0;       // OK
1012         case 402:
1013                 fprintf(stderr, "Insufficient balance\n");
1014                 return 1;
1015         case 403:       // Not in coke
1016                 fprintf(stderr, "You are not in coke (sucker)\n");
1017                 return 1;
1018         case 404:       // Unknown user
1019                 fprintf(stderr, "Unknown user '%s'\n", Username);
1020                 return 2;
1021         default:
1022                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1023                 return -1;
1024         }
1025
1026         return -1;
1027 }
1028
1029 /**
1030  * \brief Set a user's balance
1031  * \note Only avaliable to dispense admins
1032  */
1033 int Dispense_SetBalance(int Socket, const char *Username, int Balance, const char *Reason)
1034 {
1035         char    *buf;
1036          int    responseCode;
1037
1038         sendf(Socket, "SET %s %i %s\n", Username, Balance, Reason);
1039         buf = ReadLine(Socket);
1040
1041         responseCode = atoi(buf);
1042         free(buf);
1043
1044         switch(responseCode)
1045         {
1046         case 200:       return 0;       // OK
1047         case 403:       // Not in coke
1048                 fprintf(stderr, "You are not an admin\n");
1049                 return 1;
1050         case 404:       // Unknown user
1051                 fprintf(stderr, "Unknown user '%s'\n", Username);
1052                 return 2;
1053         default:
1054                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1055                 return -1;
1056         }
1057
1058         return -1;
1059 }
1060
1061 /**
1062  * \brief Give money to another user
1063  */
1064 int Dispense_Give(int Socket, const char *Username, int Ammount, const char *Reason)
1065 {
1066         char    *buf;
1067          int    responseCode;
1068
1069         if( Ammount < 0 ) {
1070                 printf("Sorry, you can only give, you can't take.\n");
1071                 return -1;
1072         }
1073
1074         // Fast return on zero
1075         if( Ammount == 0 ) {
1076                 printf("Are you actually going to give any?\n");
1077                 return 0;
1078         }
1079
1080         sendf(Socket, "GIVE %s %i %s\n", Username, Ammount, Reason);
1081         buf = ReadLine(Socket);
1082
1083         responseCode = atoi(buf);
1084         free(buf);
1085
1086         switch(responseCode)
1087         {
1088         case 200:       return 0;       // OK
1089
1090         case 402:
1091                 fprintf(stderr, "Insufficient balance\n");
1092                 return 1;
1093
1094         case 404:       // Unknown user
1095                 fprintf(stderr, "Unknown user '%s'\n", Username);
1096                 return 2;
1097
1098         default:
1099                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1100                 return -1;
1101         }
1102
1103         return -1;
1104 }
1105
1106
1107 /**
1108  * \brief Donate money to the club
1109  */
1110 int Dispense_Donate(int Socket, int Ammount, const char *Reason)
1111 {
1112         char    *buf;
1113          int    responseCode;
1114
1115         if( Ammount < 0 ) {
1116                 printf("Sorry, you can only give, you can't take.\n");
1117                 return -1;
1118         }
1119
1120         // Fast return on zero
1121         if( Ammount == 0 ) {
1122                 printf("Are you actually going to give any?\n");
1123                 return 0;
1124         }
1125
1126         sendf(Socket, "DONATE %i %s\n", Ammount, Reason);
1127         buf = ReadLine(Socket);
1128
1129         responseCode = atoi(buf);
1130         free(buf);
1131
1132         switch(responseCode)
1133         {
1134         case 200:       return 0;       // OK
1135
1136         case 402:
1137                 fprintf(stderr, "Insufficient balance\n");
1138                 return 1;
1139
1140         default:
1141                 fprintf(stderr, "Unknown response code %i\n", responseCode);
1142                 return -1;
1143         }
1144
1145         return -1;
1146 }
1147
1148 /**
1149  * \brief Enumerate users
1150  */
1151 int Dispense_EnumUsers(int Socket)
1152 {
1153         char    *buf;
1154          int    responseCode;
1155          int    nUsers;
1156         regmatch_t      matches[4];
1157
1158         if( giMinimumBalance != INT_MIN ) {
1159                 if( giMaximumBalance != INT_MAX ) {
1160                         sendf(Socket, "ENUM_USERS min_balance:%i max_balance:%i\n", giMinimumBalance, giMaximumBalance);
1161                 }
1162                 else {
1163                         sendf(Socket, "ENUM_USERS min_balance:%i\n", giMinimumBalance);
1164                 }
1165         }
1166         else {
1167                 if( giMaximumBalance != INT_MAX ) {
1168                         sendf(Socket, "ENUM_USERS max_balance:%i\n", giMaximumBalance);
1169                 }
1170                 else {
1171                         sendf(Socket, "ENUM_USERS\n");
1172                 }
1173         }
1174         buf = ReadLine(Socket);
1175         responseCode = atoi(buf);
1176
1177         switch(responseCode)
1178         {
1179         case 201:       break;  // Ok, length follows
1180
1181         default:
1182                 fprintf(stderr, "Unknown response code %i\n%s\n", responseCode, buf);
1183                 free(buf);
1184                 return -1;
1185         }
1186
1187         // Get count (not actually used)
1188         RunRegex(&gArrayRegex, buf, 4, matches, "Malformed server response");
1189         nUsers = atoi( buf + matches[3].rm_so );
1190         printf("%i users returned\n", nUsers);
1191
1192         // Free string
1193         free(buf);
1194
1195         // Read returned users
1196         do {
1197                 buf = ReadLine(Socket);
1198                 responseCode = atoi(buf);
1199
1200                 if( responseCode != 202 )       break;
1201
1202                 _PrintUserLine(buf);
1203                 free(buf);
1204         } while(responseCode == 202);
1205
1206         // Check final response
1207         if( responseCode != 200 ) {
1208                 fprintf(stderr, "Unknown response code %i\n%s\n", responseCode, buf);
1209                 free(buf);
1210                 return -1;
1211         }
1212
1213         free(buf);
1214
1215         return 0;
1216 }
1217
1218 int Dispense_ShowUser(int Socket, const char *Username)
1219 {
1220         char    *buf;
1221          int    responseCode, ret;
1222
1223         sendf(Socket, "USER_INFO %s\n", Username);
1224         buf = ReadLine(Socket);
1225
1226         responseCode = atoi(buf);
1227
1228         switch(responseCode)
1229         {
1230         case 202:
1231                 _PrintUserLine(buf);
1232                 ret = 0;
1233                 break;
1234
1235         case 404:
1236                 printf("Unknown user '%s'\n", Username);
1237                 ret = 1;
1238                 break;
1239
1240         default:
1241                 fprintf(stderr, "Unknown response code %i '%s'\n", responseCode, buf);
1242                 ret = -1;
1243                 break;
1244         }
1245
1246         free(buf);
1247
1248         return ret;
1249 }
1250
1251 void _PrintUserLine(const char *Line)
1252 {
1253         regmatch_t      matches[6];
1254          int    bal;
1255
1256         RunRegex(&gUserInfoRegex, Line, 6, matches, "Malformed server response");
1257         // 3: Username
1258         // 4: Balance
1259         // 5: Flags
1260         {
1261                  int    usernameLen = matches[3].rm_eo - matches[3].rm_so;
1262                 char    username[usernameLen + 1];
1263                  int    flagsLen = matches[5].rm_eo - matches[5].rm_so;
1264                 char    flags[flagsLen + 1];
1265
1266                 memcpy(username, Line + matches[3].rm_so, usernameLen);
1267                 username[usernameLen] = '\0';
1268                 memcpy(flags, Line + matches[5].rm_so, flagsLen);
1269                 flags[flagsLen] = '\0';
1270
1271                 bal = atoi(Line + matches[4].rm_so);
1272                 printf("%-15s: $%4i.%02i (%s)\n", username, bal/100, abs(bal)%100, flags);
1273         }
1274 }
1275
1276 int Dispense_AddUser(int Socket, const char *Username)
1277 {
1278         char    *buf;
1279          int    responseCode, ret;
1280
1281         sendf(Socket, "USER_ADD %s\n", Username);
1282
1283         buf = ReadLine(Socket);
1284         responseCode = atoi(buf);
1285
1286         switch(responseCode)
1287         {
1288         case 200:
1289                 printf("User '%s' added\n", Username);
1290                 ret = 0;
1291                 break;
1292
1293         case 403:
1294                 printf("Only wheel can add users\n");
1295                 ret = 1;
1296                 break;
1297
1298         case 404:
1299                 printf("User '%s' already exists\n", Username);
1300                 ret = 0;
1301                 break;
1302
1303         default:
1304                 fprintf(stderr, "Unknown response code %i '%s'\n", responseCode, buf);
1305                 ret = -1;
1306                 break;
1307         }
1308
1309         free(buf);
1310
1311         return ret;
1312 }
1313
1314 int Dispense_SetUserType(int Socket, const char *Username, const char *TypeString)
1315 {
1316         char    *buf;
1317          int    responseCode, ret;
1318
1319         // TODO: Pre-validate the string
1320
1321         sendf(Socket, "USER_FLAGS %s %s\n", Username, TypeString);
1322
1323         buf = ReadLine(Socket);
1324         responseCode = atoi(buf);
1325
1326         switch(responseCode)
1327         {
1328         case 200:
1329                 printf("User '%s' updated\n", Username);
1330                 ret = 0;
1331                 break;
1332
1333         case 403:
1334                 printf("Only wheel can modify users\n");
1335                 ret = 1;
1336                 break;
1337
1338         case 404:
1339                 printf("User '%s' does not exist\n", Username);
1340                 ret = 0;
1341                 break;
1342
1343         case 407:
1344                 printf("Flag string is invalid\n");
1345                 ret = 0;
1346                 break;
1347
1348         default:
1349                 fprintf(stderr, "Unknown response code %i '%s'\n", responseCode, buf);
1350                 ret = -1;
1351                 break;
1352         }
1353
1354         free(buf);
1355
1356         return ret;
1357 }
1358
1359 // ---------------
1360 // --- Helpers ---
1361 // ---------------
1362 char *ReadLine(int Socket)
1363 {
1364         static char     buf[BUFSIZ];
1365         static int      bufPos = 0;
1366         static int      bufValid = 0;
1367          int    len;
1368         char    *newline = NULL;
1369          int    retLen = 0;
1370         char    *ret = malloc(10);
1371
1372         #if DEBUG_TRACE_SERVER
1373         printf("ReadLine: ");
1374         #endif
1375         fflush(stdout);
1376
1377         ret[0] = '\0';
1378
1379         while( !newline )
1380         {
1381                 if( bufValid ) {
1382                         len = bufValid;
1383                 }
1384                 else {
1385                         len = recv(Socket, buf+bufPos, BUFSIZ-1-bufPos, 0);
1386                         buf[bufPos+len] = '\0';
1387                 }
1388
1389                 newline = strchr( buf+bufPos, '\n' );
1390                 if( newline ) {
1391                         *newline = '\0';
1392                 }
1393
1394                 retLen += strlen(buf+bufPos);
1395                 ret = realloc(ret, retLen + 1);
1396                 strcat( ret, buf+bufPos );
1397
1398                 if( newline ) {
1399                          int    newLen = newline - (buf+bufPos) + 1;
1400                         bufValid = len - newLen;
1401                         bufPos += newLen;
1402                 }
1403                 if( len + bufPos == BUFSIZ - 1 )        bufPos = 0;
1404         }
1405
1406         #if DEBUG_TRACE_SERVER
1407         printf("%i '%s'\n", retLen, ret);
1408         #endif
1409
1410         return ret;
1411 }
1412
1413 int sendf(int Socket, const char *Format, ...)
1414 {
1415         va_list args;
1416          int    len;
1417
1418         va_start(args, Format);
1419         len = vsnprintf(NULL, 0, Format, args);
1420         va_end(args);
1421
1422         {
1423                 char    buf[len+1];
1424                 va_start(args, Format);
1425                 vsnprintf(buf, len+1, Format, args);
1426                 va_end(args);
1427
1428                 #if DEBUG_TRACE_SERVER
1429                 printf("sendf: %s", buf);
1430                 #endif
1431
1432                 return send(Socket, buf, len, 0);
1433         }
1434 }
1435
1436 char *trim(char *string)
1437 {
1438          int    i;
1439
1440         while( isspace(*string) )
1441                 string ++;
1442
1443         for( i = strlen(string); i--; )
1444         {
1445                 if( isspace(string[i]) )
1446                         string[i] = '\0';
1447                 else
1448                         break;
1449         }
1450
1451         return string;
1452 }
1453
1454 int RunRegex(regex_t *regex, const char *string, int nMatches, regmatch_t *matches, const char *errorMessage)
1455 {
1456          int    ret;
1457
1458         ret = regexec(regex, string, nMatches, matches, 0);
1459         if( ret ) {
1460                 size_t  len = regerror(ret, regex, NULL, 0);
1461                 char    errorStr[len];
1462                 regerror(ret, regex, errorStr, len);
1463                 printf("string = '%s'\n", string);
1464                 fprintf(stderr, "%s\n%s", errorMessage, errorStr);
1465                 exit(-1);
1466         }
1467
1468         return ret;
1469 }
1470
1471 void CompileRegex(regex_t *regex, const char *pattern, int flags)
1472 {
1473          int    ret = regcomp(regex, pattern, flags);
1474         if( ret ) {
1475                 size_t  len = regerror(ret, regex, NULL, 0);
1476                 char    errorStr[len];
1477                 regerror(ret, regex, errorStr, len);
1478                 fprintf(stderr, "Regex compilation failed - %s\n", errorStr);
1479                 exit(-1);
1480         }
1481 }