src/server/server.c

   1 /*
   2  * OpenDispense 2
   3  * UCC (University [of WA] Computer Club) Electronic Accounting System
   4  *
   5  * server.c - Client Server Code
   6  *
   7  * This file is licenced under the 3-clause BSD Licence. See the file
   8  * COPYING for full details.
   9  */
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include "common.h"
  13 #include <sys/socket.h>
  14 #include <netinet/in.h>
  15 #include <arpa/inet.h>
  16 #include <unistd.h>
  17 #include <string.h>
  18 #include <limits.h>
  19 #include <stdarg.h>
  20
  21 #define DEBUG_TRACE_CLIENT      0
  22
  23 // Statistics
  24 #define MAX_CONNECTION_QUEUE    5
  25 #define INPUT_BUFFER_SIZE       256
  26
  27 #define HASH_TYPE       SHA1
  28 #define HASH_LENGTH     20
  29
  30 #define MSG_STR_TOO_LONG        "499 Command too long (limit "EXPSTR(INPUT_BUFFER_SIZE)")\n"
  31
  32 // === TYPES ===
  33 typedef struct sClient
  34 {
  35          int    Socket; // Client socket ID
  36          int    ID;     // Client ID
  37
  38          int    bIsTrusted;     // Is the connection from a trusted host/port
  39
  40         char    *Username;
  41         char    Salt[9];
  42
  43          int    UID;
  44          int    EffectiveUID;
  45          int    bIsAuthed;
  46 }       tClient;
  47
  48 // === PROTOTYPES ===
  49 void    Server_Start(void);
  50 void    Server_Cleanup(void);
  51 void    Server_HandleClient(int Socket, int bTrusted);
  52 void    Server_ParseClientCommand(tClient *Client, char *CommandString);
  53 // --- Commands ---
  54 void    Server_Cmd_USER(tClient *Client, char *Args);
  55 void    Server_Cmd_PASS(tClient *Client, char *Args);
  56 void    Server_Cmd_AUTOAUTH(tClient *Client, char *Args);
  57 void    Server_Cmd_SETEUSER(tClient *Client, char *Args);
  58 void    Server_Cmd_ENUMITEMS(tClient *Client, char *Args);
  59 void    Server_Cmd_ITEMINFO(tClient *Client, char *Args);
  60 void    Server_Cmd_DISPENSE(tClient *Client, char *Args);
  61 void    Server_Cmd_GIVE(tClient *Client, char *Args);
  62 void    Server_Cmd_DONATE(tClient *Client, char *Args);
  63 void    Server_Cmd_ADD(tClient *Client, char *Args);
  64 void    Server_Cmd_SET(tClient *Client, char *Args);
  65 void    Server_Cmd_ENUMUSERS(tClient *Client, char *Args);
  66 void    Server_Cmd_USERINFO(tClient *Client, char *Args);
  67 void    _SendUserInfo(tClient *Client, int UserID);
  68 void    Server_Cmd_USERADD(tClient *Client, char *Args);
  69 void    Server_Cmd_USERFLAGS(tClient *Client, char *Args);
  70 // --- Helpers ---
  71  int    Server_int_ParseFlags(tClient *Client, const char *Str, int *Mask, int *Value);
  72  int    sendf(int Socket, const char *Format, ...);
  73
  74 // === CONSTANTS ===
  75 // - Commands
  76 const struct sClientCommand {
  77         const char      *Name;
  78         void    (*Function)(tClient *Client, char *Arguments);
  79 }       gaServer_Commands[] = {
  80         {"USER", Server_Cmd_USER},
  81         {"PASS", Server_Cmd_PASS},
  82         {"AUTOAUTH", Server_Cmd_AUTOAUTH},
  83         {"SETEUSER", Server_Cmd_SETEUSER},
  84         {"ENUM_ITEMS", Server_Cmd_ENUMITEMS},
  85         {"ITEM_INFO", Server_Cmd_ITEMINFO},
  86         {"DISPENSE", Server_Cmd_DISPENSE},
  87         {"GIVE", Server_Cmd_GIVE},
  88         {"DONATE", Server_Cmd_DONATE},
  89         {"ADD", Server_Cmd_ADD},
  90         {"SET", Server_Cmd_SET},
  91         {"ENUM_USERS", Server_Cmd_ENUMUSERS},
  92         {"USER_INFO", Server_Cmd_USERINFO},
  93         {"USER_ADD", Server_Cmd_USERADD},
  94         {"USER_FLAGS", Server_Cmd_USERFLAGS}
  95 };
  96 #define NUM_COMMANDS    ((int)(sizeof(gaServer_Commands)/sizeof(gaServer_Commands[0])))
  97
  98 // === GLOBALS ===
  99  int    giServer_Port = 1020;
 100  int    giServer_NextClientID = 1;
 101  int    giServer_Socket;
 102
 103 // === CODE ===
 104 /**
 105  * \brief Open listenting socket and serve connections
 106  */
 107 void Server_Start(void)
 108 {
 109          int    client_socket;
 110         struct sockaddr_in      server_addr, client_addr;
 111
 112         atexit(Server_Cleanup);
 113
 114         // Create Server
 115         giServer_Socket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 116         if( giServer_Socket < 0 ) {
 117                 fprintf(stderr, "ERROR: Unable to create server socket\n");
 118                 return ;
 119         }
 120
 121         // Make listen address
 122         memset(&server_addr, 0, sizeof(server_addr));
 123         server_addr.sin_family = AF_INET;       // Internet Socket
 124         server_addr.sin_addr.s_addr = htonl(INADDR_ANY);        // Listen on all interfaces
 125         server_addr.sin_port = htons(giServer_Port);    // Port
 126
 127         // Bind
 128         if( bind(giServer_Socket, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0 ) {
 129                 fprintf(stderr, "ERROR: Unable to bind to 0.0.0.0:%i\n", giServer_Port);
 130                 perror("Binding");
 131                 return ;
 132         }
 133
 134         // Listen
 135         if( listen(giServer_Socket, MAX_CONNECTION_QUEUE) < 0 ) {
 136                 fprintf(stderr, "ERROR: Unable to listen to socket\n");
 137                 perror("Listen");
 138                 return ;
 139         }
 140
 141         printf("Listening on 0.0.0.0:%i\n", giServer_Port);
 142
 143         for(;;)
 144         {
 145                 uint    len = sizeof(client_addr);
 146                  int    bTrusted = 0;
 147
 148                 // Accept a connection
 149                 client_socket = accept(giServer_Socket, (struct sockaddr *) &client_addr, &len);
 150                 if(client_socket < 0) {
 151                         fprintf(stderr, "ERROR: Unable to accept client connection\n");
 152                         return ;
 153                 }
 154
 155                 // Debug: Print the connection string
 156                 if(giDebugLevel >= 2) {
 157                         char    ipstr[INET_ADDRSTRLEN];
 158                         inet_ntop(AF_INET, &client_addr.sin_addr, ipstr, INET_ADDRSTRLEN);
 159                         printf("Client connection from %s:%i\n",
 160                                 ipstr, ntohs(client_addr.sin_port));
 161                 }
 162
 163                 // Doesn't matter what, localhost is trusted
 164                 if( ntohl( client_addr.sin_addr.s_addr ) == 0x7F000001 )
 165                         bTrusted = 1;
 166
 167                 // Trusted Connections
 168                 if( ntohs(client_addr.sin_port) < 1024 )
 169                 {
 170                         // TODO: Make this runtime configurable
 171                         switch( ntohl( client_addr.sin_addr.s_addr ) )
 172                         {
 173                         case 0x7F000001:        // 127.0.0.1    localhost
 174                         //case 0x825E0D00:      // 130.95.13.0
 175                         case 0x825E0D07:        // 130.95.13.7  motsugo
 176                         case 0x825E0D12:        // 130.95.13.18 mussel
 177                         case 0x825E0D17:        // 130.95.13.23 martello
 178                                 bTrusted = 1;
 179                                 break;
 180                         default:
 181                                 break;
 182                         }
 183                 }
 184
 185                 // TODO: Multithread this?
 186                 Server_HandleClient(client_socket, bTrusted);
 187
 188                 close(client_socket);
 189         }
 190 }
 191
 192 void Server_Cleanup(void)
 193 {
 194         printf("Close(%i)\n", giServer_Socket);
 195         close(giServer_Socket);
 196 }
 197
 198 /**
 199  * \brief Reads from a client socket and parses the command strings
 200  * \param Socket        Client socket number/handle
 201  * \param bTrusted      Is the client trusted?
 202  */
 203 void Server_HandleClient(int Socket, int bTrusted)
 204 {
 205         char    inbuf[INPUT_BUFFER_SIZE];
 206         char    *buf = inbuf;
 207          int    remspace = INPUT_BUFFER_SIZE-1;
 208          int    bytes = -1;
 209         tClient clientInfo;
 210
 211         memset(&clientInfo, 0, sizeof(clientInfo));
 212
 213         // Initialise Client info
 214         clientInfo.Socket = Socket;
 215         clientInfo.ID = giServer_NextClientID ++;
 216         clientInfo.bIsTrusted = bTrusted;
 217         clientInfo.EffectiveUID = -1;
 218
 219         // Read from client
 220         /*
 221          * Notes:
 222          * - The `buf` and `remspace` variables allow a line to span several
 223          *   calls to recv(), if a line is not completed in one recv() call
 224          *   it is saved to the beginning of `inbuf` and `buf` is updated to
 225          *   the end of it.
 226          */
 227         while( (bytes = recv(Socket, buf, remspace, 0)) > 0 )
 228         {
 229                 char    *eol, *start;
 230                 buf[bytes] = '\0';      // Allow us to use stdlib string functions on it
 231
 232                 // Split by lines
 233                 start = inbuf;
 234                 while( (eol = strchr(start, '\n')) )
 235                 {
 236                         *eol = '\0';
 237
 238                         Server_ParseClientCommand(&clientInfo, start);
 239
 240                         start = eol + 1;
 241                 }
 242
 243                 // Check if there was an incomplete line
 244                 if( *start != '\0' ) {
 245                          int    tailBytes = bytes - (start-buf);
 246                         // Roll back in buffer
 247                         memcpy(inbuf, start, tailBytes);
 248                         remspace -= tailBytes;
 249                         if(remspace == 0) {
 250                                 send(Socket, MSG_STR_TOO_LONG, sizeof(MSG_STR_TOO_LONG), 0);
 251                                 buf = inbuf;
 252                                 remspace = INPUT_BUFFER_SIZE - 1;
 253                         }
 254                 }
 255                 else {
 256                         buf = inbuf;
 257                         remspace = INPUT_BUFFER_SIZE - 1;
 258                 }
 259         }
 260
 261         // Check for errors
 262         if( bytes < 0 ) {
 263                 fprintf(stderr, "ERROR: Unable to recieve from client on socket %i\n", Socket);
 264                 return ;
 265         }
 266
 267         if(giDebugLevel >= 2) {
 268                 printf("Client %i: Disconnected\n", clientInfo.ID);
 269         }
 270 }
 271
 272 /**
 273  * \brief Parses a client command and calls the required helper function
 274  * \param Client        Pointer to client state structure
 275  * \param CommandString Command from client (single line of the command)
 276  * \return Heap String to return to the client
 277  */
 278 void Server_ParseClientCommand(tClient *Client, char *CommandString)
 279 {
 280         char    *space, *args;
 281          int    i;
 282         #if 0
 283         char    **argList;
 284          int    numArgs = 0;
 285         #endif
 286
 287         // Split at first space
 288         space = strchr(CommandString, ' ');
 289         if(space == NULL) {
 290                 args = NULL;
 291         }
 292         else {
 293                 *space = '\0';
 294                 args = space + 1;
 295                 while( *space == ' ' )  space ++;
 296
 297                 #if 0
 298                 // Count arguments
 299                 numArgs = 1;
 300                 for( i = 0; args[i]; )
 301                 {
 302                         while( CommandString[i] != ' ' ) {
 303                                 if( CommandString[i] == '"' ) {
 304                                         while( !(CommandString[i] != '\\' CommandString[i+1] == '"' ) )
 305                                                 i ++;
 306                                         i ++;
 307                                 }
 308                                 i ++;
 309                         }
 310                         numArgs ++;
 311                         while( CommandString[i] == ' ' )        i ++;
 312                 }
 313                 #endif
 314         }
 315
 316
 317         // Find command
 318         for( i = 0; i < NUM_COMMANDS; i++ )
 319         {
 320                 if(strcmp(CommandString, gaServer_Commands[i].Name) == 0) {
 321                         gaServer_Commands[i].Function(Client, args);
 322                         return ;
 323                 }
 324         }
 325
 326         sendf(Client->Socket, "400 Unknown Command\n");
 327 }
 328
 329 // ---
 330 // Commands
 331 // ---
 332 /**
 333  * \brief Set client username
 334  *
 335  * Usage: USER <username>
 336  */
 337 void Server_Cmd_USER(tClient *Client, char *Args)
 338 {
 339         char    *space = strchr(Args, ' ');
 340         if(space)       *space = '\0';  // Remove characters after the ' '
 341
 342         // Debug!
 343         if( giDebugLevel )
 344                 printf("Client %i authenticating as '%s'\n", Client->ID, Args);
 345
 346         // Save username
 347         if(Client->Username)
 348                 free(Client->Username);
 349         Client->Username = strdup(Args);
 350
 351         #if USE_SALT
 352         // Create a salt (that changes if the username is changed)
 353         // Yes, I know, I'm a little paranoid, but who isn't?
 354         Client->Salt[0] = 0x21 + (rand()&0x3F);
 355         Client->Salt[1] = 0x21 + (rand()&0x3F);
 356         Client->Salt[2] = 0x21 + (rand()&0x3F);
 357         Client->Salt[3] = 0x21 + (rand()&0x3F);
 358         Client->Salt[4] = 0x21 + (rand()&0x3F);
 359         Client->Salt[5] = 0x21 + (rand()&0x3F);
 360         Client->Salt[6] = 0x21 + (rand()&0x3F);
 361         Client->Salt[7] = 0x21 + (rand()&0x3F);
 362
 363         // TODO: Also send hash type to use, (SHA1 or crypt according to [DAA])
 364         sendf(Client->Socket, "100 SALT %s\n", Client->Salt);
 365         #else
 366         sendf(Client->Socket, "100 User Set\n");
 367         #endif
 368 }
 369
 370 /**
 371  * \brief Authenticate as a user
 372  *
 373  * Usage: PASS <hash>
 374  */
 375 void Server_Cmd_PASS(tClient *Client, char *Args)
 376 {
 377         char    *space = strchr(Args, ' ');
 378         if(space)       *space = '\0';  // Remove characters after the ' '
 379
 380         // Pass on to cokebank
 381         Client->UID = Bank_GetUserAuth(Client->Salt, Client->Username, Args);
 382
 383         if( Client->UID != -1 ) {
 384                 Client->bIsAuthed = 1;
 385                 sendf(Client->Socket, "200 Auth OK\n");
 386                 return ;
 387         }
 388
 389         sendf(Client->Socket, "401 Auth Failure\n");
 390 }
 391
 392 /**
 393  * \brief Authenticate as a user without a password
 394  *
 395  * Usage: AUTOAUTH <user>
 396  */
 397 void Server_Cmd_AUTOAUTH(tClient *Client, char *Args)
 398 {
 399         char    *space = strchr(Args, ' ');
 400         if(space)       *space = '\0';  // Remove characters after the ' '
 401
 402         // Check if trusted
 403         if( !Client->bIsTrusted ) {
 404                 if(giDebugLevel)
 405                         printf("Client %i: Untrusted client attempting to AUTOAUTH\n", Client->ID);
 406                 sendf(Client->Socket, "401 Untrusted\n");
 407                 return ;
 408         }
 409
 410         // Get UID
 411         Client->UID = Bank_GetAcctByName( Args );
 412         if( Client->UID < 0 ) {
 413                 if(giDebugLevel)
 414                         printf("Client %i: Unknown user '%s'\n", Client->ID, Args);
 415                 sendf(Client->Socket, "401 Auth Failure\n");
 416                 return ;
 417         }
 418
 419         // You can't be an internal account
 420         if( Bank_GetFlags(Client->UID) & USER_FLAG_INTERNAL ) {
 421                 Client->UID = -1;
 422                 sendf(Client->Socket, "401 Auth Failure\n");
 423                 return ;
 424         }
 425
 426         if(giDebugLevel)
 427                 printf("Client %i: Authenticated as '%s' (%i)\n", Client->ID, Args, Client->UID);
 428
 429         sendf(Client->Socket, "200 Auth OK\n");
 430 }
 431
 432 /**
 433  * \brief Set effective user
 434  */
 435 void Server_Cmd_SETEUSER(tClient *Client, char *Args)
 436 {
 437         char    *space;
 438
 439         space = strchr(Args, ' ');
 440
 441         if(space)       *space = '\0';
 442
 443         if( !strlen(Args) ) {
 444                 sendf(Client->Socket, "407 SETEUSER expects an argument\n");
 445                 return ;
 446         }
 447
 448         // Check user permissions
 449         if( !(Bank_GetFlags(Client->UID) & (USER_FLAG_COKE|USER_FLAG_ADMIN)) ) {
 450                 sendf(Client->Socket, "403 Not in coke\n");
 451                 return ;
 452         }
 453
 454         // Set id
 455         Client->EffectiveUID = Bank_GetAcctByName(Args);
 456         if( Client->EffectiveUID == -1 ) {
 457                 sendf(Client->Socket, "404 User not found\n");
 458                 return ;
 459         }
 460
 461         // You can't be an internal account
 462         if( Bank_GetFlags(Client->EffectiveUID) & USER_FLAG_INTERNAL ) {
 463                 Client->EffectiveUID = -1;
 464                 sendf(Client->Socket, "404 User not found\n");
 465                 return ;
 466         }
 467
 468         sendf(Client->Socket, "200 User set\n");
 469 }
 470
 471 /**
 472  * \brief Enumerate the items that the server knows about
 473  */
 474 void Server_Cmd_ENUMITEMS(tClient *Client, char *Args)
 475 {
 476          int    i;
 477
 478         if( Args != NULL && strlen(Args) ) {
 479                 sendf(Client->Socket, "407 ENUM_ITEMS takes no arguments\n");
 480                 return ;
 481         }
 482
 483         sendf(Client->Socket, "201 Items %i\n", giNumItems);
 484
 485         for( i = 0; i < giNumItems; i ++ ) {
 486                 sendf(Client->Socket,
 487                         "202 Item %s:%i %i %s\n",
 488                          gaItems[i].Handler->Name, gaItems[i].ID, gaItems[i].Price, gaItems[i].Name
 489                          );
 490         }
 491
 492         sendf(Client->Socket, "200 List end\n");
 493 }
 494
 495 tItem *_GetItemFromString(char *String)
 496 {
 497         tHandler        *handler;
 498         char    *type = String;
 499         char    *colon = strchr(String, ':');
 500          int    num, i;
 501
 502         if( !colon ) {
 503                 return NULL;
 504         }
 505
 506         num = atoi(colon+1);
 507         *colon = '\0';
 508
 509         // Find handler
 510         handler = NULL;
 511         for( i = 0; i < giNumHandlers; i ++ )
 512         {
 513                 if( strcmp(gaHandlers[i]->Name, type) == 0) {
 514                         handler = gaHandlers[i];
 515                         break;
 516                 }
 517         }
 518         if( !handler ) {
 519                 return NULL;
 520         }
 521
 522         // Find item
 523         for( i = 0; i < giNumItems; i ++ )
 524         {
 525                 if( gaItems[i].Handler != handler )     continue;
 526                 if( gaItems[i].ID != num )      continue;
 527                 return &gaItems[i];
 528         }
 529         return NULL;
 530 }
 531
 532 /**
 533  * \brief Fetch information on a specific item
 534  */
 535 void Server_Cmd_ITEMINFO(tClient *Client, char *Args)
 536 {
 537         tItem   *item = _GetItemFromString(Args);
 538
 539         if( !item ) {
 540                 sendf(Client->Socket, "406 Bad Item ID\n");
 541                 return ;
 542         }
 543
 544         sendf(Client->Socket,
 545                 "202 Item %s:%i %i %s\n",
 546                  item->Handler->Name, item->ID, item->Price, item->Name
 547                  );
 548 }
 549
 550 void Server_Cmd_DISPENSE(tClient *Client, char *Args)
 551 {
 552         tItem   *item;
 553          int    ret;
 554          int    uid;
 555
 556         if( !Client->bIsAuthed ) {
 557                 sendf(Client->Socket, "401 Not Authenticated\n");
 558                 return ;
 559         }
 560
 561         item = _GetItemFromString(Args);
 562         if( !item ) {
 563                 sendf(Client->Socket, "406 Bad Item ID\n");
 564                 return ;
 565         }
 566
 567         if( Client->EffectiveUID != -1 ) {
 568                 uid = Client->EffectiveUID;
 569         }
 570         else {
 571                 uid = Client->UID;
 572         }
 573
 574         switch( ret = DispenseItem( Client->UID, uid, item ) )
 575         {
 576         case 0: sendf(Client->Socket, "200 Dispense OK\n");     return ;
 577         case 1: sendf(Client->Socket, "501 Unable to dispense\n");      return ;
 578         case 2: sendf(Client->Socket, "402 Poor You\n");        return ;
 579         default:
 580                 sendf(Client->Socket, "500 Dispense Error\n");
 581                 return ;
 582         }
 583 }
 584
 585 void Server_Cmd_GIVE(tClient *Client, char *Args)
 586 {
 587         char    *recipient, *ammount, *reason;
 588          int    uid, iAmmount;
 589          int    thisUid;
 590
 591         if( !Client->bIsAuthed ) {
 592                 sendf(Client->Socket, "401 Not Authenticated\n");
 593                 return ;
 594         }
 595
 596         recipient = Args;
 597
 598         ammount = strchr(Args, ' ');
 599         if( !ammount ) {
 600                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
 601                 return ;
 602         }
 603         *ammount = '\0';
 604         ammount ++;
 605
 606         reason = strchr(ammount, ' ');
 607         if( !reason ) {
 608                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
 609                 return ;
 610         }
 611         *reason = '\0';
 612         reason ++;
 613
 614         // Get recipient
 615         uid = Bank_GetAcctByName(recipient);
 616         if( uid == -1 ) {
 617                 sendf(Client->Socket, "404 Invalid target user\n");
 618                 return ;
 619         }
 620
 621         // You can't alter an internal account
 622         if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
 623                 sendf(Client->Socket, "404 Invalid target user\n");
 624                 return ;
 625         }
 626
 627         // Parse ammount
 628         iAmmount = atoi(ammount);
 629         if( iAmmount <= 0 ) {
 630                 sendf(Client->Socket, "407 Invalid Argument, ammount must be > zero\n");
 631                 return ;
 632         }
 633
 634         if( Client->EffectiveUID != -1 ) {
 635                 thisUid = Client->EffectiveUID;
 636         }
 637         else {
 638                 thisUid = Client->UID;
 639         }
 640
 641         // Do give
 642         switch( DispenseGive(Client->UID, thisUid, uid, iAmmount, reason) )
 643         {
 644         case 0:
 645                 sendf(Client->Socket, "200 Give OK\n");
 646                 return ;
 647         case 2:
 648                 sendf(Client->Socket, "402 Poor You\n");
 649                 return ;
 650         default:
 651                 sendf(Client->Socket, "500 Unknown error\n");
 652                 return ;
 653         }
 654 }
 655
 656 void Server_Cmd_DONATE(tClient *Client, char *Args)
 657 {
 658         char    *ammount, *reason;
 659          int    iAmmount;
 660          int    thisUid;
 661
 662         if( !Client->bIsAuthed ) {
 663                 sendf(Client->Socket, "401 Not Authenticated\n");
 664                 return ;
 665         }
 666
 667         ammount = Args;
 668
 669         // Get the start of the reason
 670         reason = strchr(Args, ' ');
 671         if( !ammount ) {
 672                 sendf(Client->Socket, "407 Invalid Argument, expected 2 parameters, 1 encountered\n");
 673                 return ;
 674         }
 675         *reason = '\0';
 676         reason ++;
 677
 678         // Check the end of the reason
 679         if( strchr(reason, ' ') ) {
 680                 sendf(Client->Socket, "407 Invalid Argument, expected 2 parameters, more encountered\n");
 681                 return ;
 682         }
 683
 684         // Parse ammount
 685         iAmmount = atoi(ammount);
 686         if( iAmmount <= 0 ) {
 687                 sendf(Client->Socket, "407 Invalid Argument, ammount must be > zero\n");
 688                 return ;
 689         }
 690
 691         // Handle effective users
 692         if( Client->EffectiveUID != -1 ) {
 693                 thisUid = Client->EffectiveUID;
 694         }
 695         else {
 696                 thisUid = Client->UID;
 697         }
 698
 699         // Do give
 700         switch( DispenseDonate(Client->UID, thisUid, iAmmount, reason) )
 701         {
 702         case 0:
 703                 sendf(Client->Socket, "200 Give OK\n");
 704                 return ;
 705         case 2:
 706                 sendf(Client->Socket, "402 Poor You\n");
 707                 return ;
 708         default:
 709                 sendf(Client->Socket, "500 Unknown error\n");
 710                 return ;
 711         }
 712 }
 713
 714 void Server_Cmd_ADD(tClient *Client, char *Args)
 715 {
 716         char    *user, *ammount, *reason;
 717          int    uid, iAmmount;
 718
 719         if( !Client->bIsAuthed ) {
 720                 sendf(Client->Socket, "401 Not Authenticated\n");
 721                 return ;
 722         }
 723
 724         user = Args;
 725
 726         ammount = strchr(Args, ' ');
 727         if( !ammount ) {
 728                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
 729                 return ;
 730         }
 731         *ammount = '\0';
 732         ammount ++;
 733
 734         reason = strchr(ammount, ' ');
 735         if( !reason ) {
 736                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
 737                 return ;
 738         }
 739         *reason = '\0';
 740         reason ++;
 741
 742         // Check user permissions
 743         if( !(Bank_GetFlags(Client->UID) & (USER_FLAG_COKE|USER_FLAG_ADMIN))  ) {
 744                 sendf(Client->Socket, "403 Not in coke\n");
 745                 return ;
 746         }
 747
 748         // Get recipient
 749         uid = Bank_GetAcctByName(user);
 750         if( uid == -1 ) {
 751                 sendf(Client->Socket, "404 Invalid user\n");
 752                 return ;
 753         }
 754
 755         // You can't alter an internal account
 756         if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
 757                 sendf(Client->Socket, "404 Invalid user\n");
 758                 return ;
 759         }
 760
 761         // Parse ammount
 762         iAmmount = atoi(ammount);
 763         if( iAmmount == 0 && ammount[0] != '0' ) {
 764                 sendf(Client->Socket, "407 Invalid Argument\n");
 765                 return ;
 766         }
 767
 768         // Do give
 769         switch( DispenseAdd(Client->UID, uid, iAmmount, reason) )
 770         {
 771         case 0:
 772                 sendf(Client->Socket, "200 Add OK\n");
 773                 return ;
 774         case 2:
 775                 sendf(Client->Socket, "402 Poor Guy\n");
 776                 return ;
 777         default:
 778                 sendf(Client->Socket, "500 Unknown error\n");
 779                 return ;
 780         }
 781 }
 782
 783 void Server_Cmd_SET(tClient *Client, char *Args)
 784 {
 785         char    *user, *ammount, *reason;
 786          int    uid, iAmmount;
 787
 788         if( !Client->bIsAuthed ) {
 789                 sendf(Client->Socket, "401 Not Authenticated\n");
 790                 return ;
 791         }
 792
 793         user = Args;
 794
 795         ammount = strchr(Args, ' ');
 796         if( !ammount ) {
 797                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
 798                 return ;
 799         }
 800         *ammount = '\0';
 801         ammount ++;
 802
 803         reason = strchr(ammount, ' ');
 804         if( !reason ) {
 805                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
 806                 return ;
 807         }
 808         *reason = '\0';
 809         reason ++;
 810
 811         // Check user permissions
 812         if( !(Bank_GetFlags(Client->UID) & USER_FLAG_ADMIN)  ) {
 813                 sendf(Client->Socket, "403 Not an admin\n");
 814                 return ;
 815         }
 816
 817         // Get recipient
 818         uid = Bank_GetAcctByName(user);
 819         if( uid == -1 ) {
 820                 sendf(Client->Socket, "404 Invalid user\n");
 821                 return ;
 822         }
 823
 824         // You can't alter an internal account
 825         if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
 826                 sendf(Client->Socket, "404 Invalid user\n");
 827                 return ;
 828         }
 829
 830         // Parse ammount
 831         iAmmount = atoi(ammount);
 832         if( iAmmount == 0 && ammount[0] != '0' ) {
 833                 sendf(Client->Socket, "407 Invalid Argument\n");
 834                 return ;
 835         }
 836
 837         // Do give
 838         switch( DispenseSet(Client->UID, uid, iAmmount, reason) )
 839         {
 840         case 0:
 841                 sendf(Client->Socket, "200 Add OK\n");
 842                 return ;
 843         case 2:
 844                 sendf(Client->Socket, "402 Poor Guy\n");
 845                 return ;
 846         default:
 847                 sendf(Client->Socket, "500 Unknown error\n");
 848                 return ;
 849         }
 850 }
 851
 852 void Server_Cmd_ENUMUSERS(tClient *Client, char *Args)
 853 {
 854          int    i, numRet = 0;
 855         tAcctIterator   *it;
 856          int    maxBal = INT_MAX, minBal = INT_MIN;
 857          int    flagMask = 0, flagVal = 0;
 858          int    sort = BANK_ITFLAG_SORT_NAME;
 859         time_t  lastSeenAfter=0, lastSeenBefore=0;
 860
 861          int    flags;  // Iterator flags
 862          int    balValue;       // Balance value for iterator
 863         time_t  timeValue;      // Time value for iterator
 864
 865         // Parse arguments
 866         if( Args && strlen(Args) )
 867         {
 868                 char    *space = Args, *type, *val;
 869                 do
 870                 {
 871                         type = space;
 872                         // Get next space
 873                         space = strchr(space, ' ');
 874                         if(space)       *space = '\0';
 875
 876                         // Get type
 877                         val = strchr(type, ':');
 878                         if( val ) {
 879                                 *val = '\0';
 880                                 val ++;
 881
 882                                 // Types
 883                                 // - Minium Balance
 884                                 if( strcmp(type, "min_balance") == 0 ) {
 885                                         minBal = atoi(val);
 886                                 }
 887                                 // - Maximum Balance
 888                                 else if( strcmp(type, "max_balance") == 0 ) {
 889                                         maxBal = atoi(val);
 890                                 }
 891                                 // - Flags
 892                                 else if( strcmp(type, "flags") == 0 ) {
 893                                         if( Server_int_ParseFlags(Client, val, &flagMask, &flagVal) )
 894                                                 return ;
 895                                 }
 896                                 // - Last seen before timestamp
 897                                 else if( strcmp(type, "last_seen_before") == 0 ) {
 898                                         lastSeenAfter = atoll(val);
 899                                 }
 900                                 // - Last seen after timestamp
 901                                 else if( strcmp(type, "last_seen_after") == 0 ) {
 902                                         lastSeenAfter = atoll(val);
 903                                 }
 904                                 // - Sorting
 905                                 else if( strcmp(type, "sort") == 0 ) {
 906                                         char    *dash = strchr(val, '-');
 907                                         if( dash ) {
 908                                                 *dash = '\0';
 909                                                 dash ++;
 910                                         }
 911                                         if( strcmp(val, "name") == 0 ) {
 912                                                 sort = BANK_ITFLAG_SORT_NAME;
 913                                         }
 914                                         else if( strcmp(val, "balance") == 0 ) {
 915                                                 sort = BANK_ITFLAG_SORT_BAL;
 916                                         }
 917                                         else if( strcmp(val, "lastseen") == 0 ) {
 918                                                 sort = BANK_ITFLAG_SORT_LASTSEEN;
 919                                         }
 920                                         else {
 921                                                 sendf(Client->Socket, "407 Unknown sort field ('%s')\n", val);
 922                                                 return ;
 923                                         }
 924                                         // Handle sort direction
 925                                         if( dash ) {
 926                                                 if( strcmp(dash, "desc") == 0 ) {
 927                                                         sort |= BANK_ITFLAG_REVSORT;
 928                                                 }
 929                                                 else {
 930                                                         sendf(Client->Socket, "407 Unknown sort direction '%s'\n", dash);
 931                                                         return ;
 932                                                 }
 933                                                 dash[-1] = '-';
 934                                         }
 935                                 }
 936                                 else {
 937                                         sendf(Client->Socket, "407 Unknown argument to ENUM_USERS '%s:%s'\n", type, val);
 938                                         return ;
 939                                 }
 940
 941                                 val[-1] = ':';
 942                         }
 943                         else {
 944                                 sendf(Client->Socket, "407 Unknown argument to ENUM_USERS '%s'\n", type);
 945                                 return ;
 946                         }
 947
 948                         // Eat whitespace
 949                         if( space ) {
 950                                 *space = ' ';   // Repair (to be nice)
 951                                 space ++;
 952                                 while(*space == ' ')    space ++;
 953                         }
 954                 }       while(space);
 955         }
 956
 957         // Create iterator
 958         if( maxBal != INT_MAX ) {
 959                 flags = sort|BANK_ITFLAG_MAXBALANCE;
 960                 balValue = maxBal;
 961         }
 962         else if( minBal != INT_MIN ) {
 963                 flags = sort|BANK_ITFLAG_MINBALANCE;
 964                 balValue = minBal;
 965         }
 966         else {
 967                 flags = sort;
 968                 balValue = 0;
 969         }
 970         if( lastSeenBefore ) {
 971                 timeValue = lastSeenBefore;
 972                 flags |= BANK_ITFLAG_SEENBEFORE;
 973         }
 974         else if( lastSeenAfter ) {
 975                 timeValue = lastSeenAfter;
 976                 flags |= BANK_ITFLAG_SEENAFTER;
 977         }
 978         else {
 979                 timeValue = 0;
 980         }
 981         it = Bank_Iterator(flagMask, flagVal, flags, balValue, timeValue);
 982
 983         // Get return number
 984         while( (i = Bank_IteratorNext(it)) != -1 )
 985         {
 986                 int bal = Bank_GetBalance(i);
 987
 988                 if( bal == INT_MIN )    continue;
 989
 990                 if( bal < minBal )      continue;
 991                 if( bal > maxBal )      continue;
 992
 993                 numRet ++;
 994         }
 995
 996         Bank_DelIterator(it);
 997
 998         // Send count
 999         sendf(Client->Socket, "201 Users %i\n", numRet);
1000
1001
1002         // Create iterator
1003         it = Bank_Iterator(flagMask, flagVal, flags, balValue, timeValue);
1004
1005         while( (i = Bank_IteratorNext(it)) != -1 )
1006         {
1007                 int bal = Bank_GetBalance(i);
1008
1009                 if( bal == INT_MIN )    continue;
1010
1011                 if( bal < minBal )      continue;
1012                 if( bal > maxBal )      continue;
1013
1014                 _SendUserInfo(Client, i);
1015         }
1016
1017         Bank_DelIterator(it);
1018
1019         sendf(Client->Socket, "200 List End\n");
1020 }
1021
1022 void Server_Cmd_USERINFO(tClient *Client, char *Args)
1023 {
1024          int    uid;
1025         char    *user = Args;
1026         char    *space;
1027
1028         space = strchr(user, ' ');
1029         if(space)       *space = '\0';
1030
1031         // Get recipient
1032         uid = Bank_GetAcctByName(user);
1033         if( uid == -1 ) {
1034                 sendf(Client->Socket, "404 Invalid user");
1035                 return ;
1036         }
1037
1038         _SendUserInfo(Client, uid);
1039 }
1040
1041 void _SendUserInfo(tClient *Client, int UserID)
1042 {
1043         char    *type, *disabled="", *door="";
1044          int    flags = Bank_GetFlags(UserID);
1045
1046         if( flags & USER_FLAG_INTERNAL ) {
1047                 type = "internal";
1048         }
1049         else if( flags & USER_FLAG_COKE ) {
1050                 if( flags & USER_FLAG_ADMIN )
1051                         type = "coke,admin";
1052                 else
1053                         type = "coke";
1054         }
1055         else if( flags & USER_FLAG_ADMIN ) {
1056                 type = "admin";
1057         }
1058         else {
1059                 type = "user";
1060         }
1061
1062         if( flags & USER_FLAG_DISABLED )
1063                 disabled = ",disabled";
1064         if( flags & USER_FLAG_DOORGROUP )
1065                 door = ",door";
1066
1067         // TODO: User flags/type
1068         sendf(
1069                 Client->Socket, "202 User %s %i %s%s\n",
1070                 Bank_GetAcctName(UserID), Bank_GetBalance(UserID),
1071                 type, disabled
1072                 );
1073 }
1074
1075 void Server_Cmd_USERADD(tClient *Client, char *Args)
1076 {
1077         char    *username, *space;
1078
1079         // Check permissions
1080         if( !(Bank_GetFlags(Client->UID) & USER_FLAG_ADMIN) ) {
1081                 sendf(Client->Socket, "403 Not a coke admin\n");
1082                 return ;
1083         }
1084
1085         // Read arguments
1086         username = Args;
1087         while( *username == ' ' )       username ++;
1088         space = strchr(username, ' ');
1089         if(space)       *space = '\0';
1090
1091         // Try to create user
1092         if( Bank_CreateAcct(username) == -1 ) {
1093                 sendf(Client->Socket, "404 User exists\n");
1094                 return ;
1095         }
1096
1097         {
1098                 char    *thisName = Bank_GetAcctName(Client->UID);
1099                 Log_Info("Account '%s' created by '%s'", username, thisName);
1100                 free(thisName);
1101         }
1102
1103         sendf(Client->Socket, "200 User Added\n");
1104 }
1105
1106 void Server_Cmd_USERFLAGS(tClient *Client, char *Args)
1107 {
1108         char    *username, *flags;
1109         char    *space;
1110          int    mask=0, value=0;
1111          int    uid;
1112
1113         // Check permissions
1114         if( !(Bank_GetFlags(Client->UID) & USER_FLAG_ADMIN) ) {
1115                 sendf(Client->Socket, "403 Not a coke admin\n");
1116                 return ;
1117         }
1118
1119         // Read arguments
1120         // - Username
1121         username = Args;
1122         while( *username == ' ' )       username ++;
1123         space = strchr(username, ' ');
1124         if(!space) {
1125                 sendf(Client->Socket, "407 USER_FLAGS requires 2 arguments, 1 given\n");
1126                 return ;
1127         }
1128         *space = '\0';
1129         // - Flags
1130         flags = space + 1;
1131         while( *flags == ' ' )  flags ++;
1132         space = strchr(flags, ' ');
1133         if(space)       *space = '\0';
1134
1135         // Get UID
1136         uid = Bank_GetAcctByName(username);
1137         if( uid == -1 ) {
1138                 sendf(Client->Socket, "404 User '%s' not found\n", username);
1139                 return ;
1140         }
1141
1142         // Parse flags
1143         if( Server_int_ParseFlags(Client, flags, &mask, &value) )
1144                 return ;
1145
1146         // Apply flags
1147         Bank_SetFlags(uid, mask, value);
1148
1149         // Return OK
1150         sendf(Client->Socket, "200 User Updated\n");
1151 }
1152
1153 // --- INTERNAL HELPERS ---
1154 int sendf(int Socket, const char *Format, ...)
1155 {
1156         va_list args;
1157          int    len;
1158
1159         va_start(args, Format);
1160         len = vsnprintf(NULL, 0, Format, args);
1161         va_end(args);
1162
1163         {
1164                 char    buf[len+1];
1165                 va_start(args, Format);
1166                 vsnprintf(buf, len+1, Format, args);
1167                 va_end(args);
1168
1169                 #if DEBUG_TRACE_CLIENT
1170                 printf("sendf: %s", buf);
1171                 #endif
1172
1173                 return send(Socket, buf, len, 0);
1174         }
1175 }
1176
1177 int Server_int_ParseFlags(tClient *Client, const char *Str, int *Mask, int *Value)
1178 {
1179         struct {
1180                 const char      *Name;
1181                  int    Mask;
1182                  int    Value;
1183         }       cFLAGS[] = {
1184                  {"disabled", USER_FLAG_DISABLED, USER_FLAG_DISABLED}
1185                 ,{"door", USER_FLAG_DOORGROUP, USER_FLAG_DOORGROUP}
1186                 ,{"coke", USER_FLAG_COKE, USER_FLAG_COKE}
1187                 ,{"admin", USER_FLAG_ADMIN, USER_FLAG_ADMIN}
1188                 ,{"internal", USER_FLAG_INTERNAL, USER_FLAG_INTERNAL}
1189         };
1190         const int       ciNumFlags = sizeof(cFLAGS)/sizeof(cFLAGS[0]);
1191
1192         char    *space;
1193
1194         *Mask = 0;
1195         *Value = 0;
1196
1197         do {
1198                  int    bRemove = 0;
1199                  int    i;
1200                  int    len;
1201
1202                 while( *Str == ' ' )    Str ++; // Eat whitespace
1203                 space = strchr(Str, ',');       // Find the end of the flag
1204                 if(space)
1205                         len = space - Str;
1206                 else
1207                         len = strlen(Str);
1208
1209                 // Check for inversion/removal
1210                 if( *Str == '!' || *Str == '-' ) {
1211                         bRemove = 1;
1212                         Str ++;
1213                 }
1214                 else if( *Str == '+' ) {
1215                         Str ++;
1216                 }
1217
1218                 // Check flag values
1219                 for( i = 0; i < ciNumFlags; i ++ )
1220                 {
1221                         if( strncmp(Str, cFLAGS[i].Name, len) == 0 ) {
1222                                 *Mask |= cFLAGS[i].Mask;
1223                                 *Value &= ~cFLAGS[i].Mask;
1224                                 if( !bRemove )
1225                                         *Value |= cFLAGS[i].Value;
1226                                 break;
1227                         }
1228                 }
1229
1230                 // Error check
1231                 if( i == ciNumFlags ) {
1232                         char    val[len+1];
1233                         strncpy(val, Str, len+1);
1234                         sendf(Client->Socket, "407 Unknown flag value '%s'\n", val);
1235                         return -1;
1236                 }
1237
1238                 Str = space + 1;
1239         } while(space);
1240
1241         return 0;
1242 }