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         Client->bIsAuthed = 1;
 427
 428         if(giDebugLevel)
 429                 printf("Client %i: Auto authenticated as '%s' (%i)\n", Client->ID, Args, Client->UID);
 430
 431         sendf(Client->Socket, "200 Auth OK\n");
 432 }
 433
 434 /**
 435  * \brief Set effective user
 436  */
 437 void Server_Cmd_SETEUSER(tClient *Client, char *Args)
 438 {
 439         char    *space;
 440
 441         space = strchr(Args, ' ');
 442
 443         if(space)       *space = '\0';
 444
 445         if( !strlen(Args) ) {
 446                 sendf(Client->Socket, "407 SETEUSER expects an argument\n");
 447                 return ;
 448         }
 449
 450         // Check user permissions
 451         if( !(Bank_GetFlags(Client->UID) & (USER_FLAG_COKE|USER_FLAG_ADMIN)) ) {
 452                 sendf(Client->Socket, "403 Not in coke\n");
 453                 return ;
 454         }
 455
 456         // Set id
 457         Client->EffectiveUID = Bank_GetAcctByName(Args);
 458         if( Client->EffectiveUID == -1 ) {
 459                 sendf(Client->Socket, "404 User not found\n");
 460                 return ;
 461         }
 462
 463         // You can't be an internal account
 464         if( Bank_GetFlags(Client->EffectiveUID) & USER_FLAG_INTERNAL ) {
 465                 Client->EffectiveUID = -1;
 466                 sendf(Client->Socket, "404 User not found\n");
 467                 return ;
 468         }
 469
 470         sendf(Client->Socket, "200 User set\n");
 471 }
 472
 473 /**
 474  * \brief Enumerate the items that the server knows about
 475  */
 476 void Server_Cmd_ENUMITEMS(tClient *Client, char *Args)
 477 {
 478          int    i;
 479
 480         if( Args != NULL && strlen(Args) ) {
 481                 sendf(Client->Socket, "407 ENUM_ITEMS takes no arguments\n");
 482                 return ;
 483         }
 484
 485         sendf(Client->Socket, "201 Items %i\n", giNumItems);
 486
 487         for( i = 0; i < giNumItems; i ++ ) {
 488                 sendf(Client->Socket,
 489                         "202 Item %s:%i %i %s\n",
 490                          gaItems[i].Handler->Name, gaItems[i].ID, gaItems[i].Price, gaItems[i].Name
 491                          );
 492         }
 493
 494         sendf(Client->Socket, "200 List end\n");
 495 }
 496
 497 tItem *_GetItemFromString(char *String)
 498 {
 499         tHandler        *handler;
 500         char    *type = String;
 501         char    *colon = strchr(String, ':');
 502          int    num, i;
 503
 504         if( !colon ) {
 505                 return NULL;
 506         }
 507
 508         num = atoi(colon+1);
 509         *colon = '\0';
 510
 511         // Find handler
 512         handler = NULL;
 513         for( i = 0; i < giNumHandlers; i ++ )
 514         {
 515                 if( strcmp(gaHandlers[i]->Name, type) == 0) {
 516                         handler = gaHandlers[i];
 517                         break;
 518                 }
 519         }
 520         if( !handler ) {
 521                 return NULL;
 522         }
 523
 524         // Find item
 525         for( i = 0; i < giNumItems; i ++ )
 526         {
 527                 if( gaItems[i].Handler != handler )     continue;
 528                 if( gaItems[i].ID != num )      continue;
 529                 return &gaItems[i];
 530         }
 531         return NULL;
 532 }
 533
 534 /**
 535  * \brief Fetch information on a specific item
 536  */
 537 void Server_Cmd_ITEMINFO(tClient *Client, char *Args)
 538 {
 539         tItem   *item = _GetItemFromString(Args);
 540
 541         if( !item ) {
 542                 sendf(Client->Socket, "406 Bad Item ID\n");
 543                 return ;
 544         }
 545
 546         sendf(Client->Socket,
 547                 "202 Item %s:%i %i %s\n",
 548                  item->Handler->Name, item->ID, item->Price, item->Name
 549                  );
 550 }
 551
 552 void Server_Cmd_DISPENSE(tClient *Client, char *Args)
 553 {
 554         tItem   *item;
 555          int    ret;
 556          int    uid;
 557
 558         if( !Client->bIsAuthed ) {
 559                 sendf(Client->Socket, "401 Not Authenticated\n");
 560                 return ;
 561         }
 562
 563         item = _GetItemFromString(Args);
 564         if( !item ) {
 565                 sendf(Client->Socket, "406 Bad Item ID\n");
 566                 return ;
 567         }
 568
 569         if( Client->EffectiveUID != -1 ) {
 570                 uid = Client->EffectiveUID;
 571         }
 572         else {
 573                 uid = Client->UID;
 574         }
 575
 576         switch( ret = DispenseItem( Client->UID, uid, item ) )
 577         {
 578         case 0: sendf(Client->Socket, "200 Dispense OK\n");     return ;
 579         case 1: sendf(Client->Socket, "501 Unable to dispense\n");      return ;
 580         case 2: sendf(Client->Socket, "402 Poor You\n");        return ;
 581         default:
 582                 sendf(Client->Socket, "500 Dispense Error\n");
 583                 return ;
 584         }
 585 }
 586
 587 void Server_Cmd_GIVE(tClient *Client, char *Args)
 588 {
 589         char    *recipient, *ammount, *reason;
 590          int    uid, iAmmount;
 591          int    thisUid;
 592
 593         if( !Client->bIsAuthed ) {
 594                 sendf(Client->Socket, "401 Not Authenticated\n");
 595                 return ;
 596         }
 597
 598         recipient = Args;
 599
 600         ammount = strchr(Args, ' ');
 601         if( !ammount ) {
 602                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
 603                 return ;
 604         }
 605         *ammount = '\0';
 606         ammount ++;
 607
 608         reason = strchr(ammount, ' ');
 609         if( !reason ) {
 610                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
 611                 return ;
 612         }
 613         *reason = '\0';
 614         reason ++;
 615
 616         // Get recipient
 617         uid = Bank_GetAcctByName(recipient);
 618         if( uid == -1 ) {
 619                 sendf(Client->Socket, "404 Invalid target user\n");
 620                 return ;
 621         }
 622
 623         // You can't alter an internal account
 624         if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
 625                 sendf(Client->Socket, "404 Invalid target user\n");
 626                 return ;
 627         }
 628
 629         // Parse ammount
 630         iAmmount = atoi(ammount);
 631         if( iAmmount <= 0 ) {
 632                 sendf(Client->Socket, "407 Invalid Argument, ammount must be > zero\n");
 633                 return ;
 634         }
 635
 636         if( Client->EffectiveUID != -1 ) {
 637                 thisUid = Client->EffectiveUID;
 638         }
 639         else {
 640                 thisUid = Client->UID;
 641         }
 642
 643         // Do give
 644         switch( DispenseGive(Client->UID, thisUid, uid, iAmmount, reason) )
 645         {
 646         case 0:
 647                 sendf(Client->Socket, "200 Give OK\n");
 648                 return ;
 649         case 2:
 650                 sendf(Client->Socket, "402 Poor You\n");
 651                 return ;
 652         default:
 653                 sendf(Client->Socket, "500 Unknown error\n");
 654                 return ;
 655         }
 656 }
 657
 658 void Server_Cmd_DONATE(tClient *Client, char *Args)
 659 {
 660         char    *ammount, *reason;
 661          int    iAmmount;
 662          int    thisUid;
 663
 664         if( !Client->bIsAuthed ) {
 665                 sendf(Client->Socket, "401 Not Authenticated\n");
 666                 return ;
 667         }
 668
 669         ammount = Args;
 670
 671         // Get the start of the reason
 672         reason = strchr(Args, ' ');
 673         if( !ammount ) {
 674                 sendf(Client->Socket, "407 Invalid Argument, expected 2 parameters, 1 encountered\n");
 675                 return ;
 676         }
 677         *reason = '\0';
 678         reason ++;
 679
 680         // Check the end of the reason
 681         if( strchr(reason, ' ') ) {
 682                 sendf(Client->Socket, "407 Invalid Argument, expected 2 parameters, more encountered\n");
 683                 return ;
 684         }
 685
 686         // Parse ammount
 687         iAmmount = atoi(ammount);
 688         if( iAmmount <= 0 ) {
 689                 sendf(Client->Socket, "407 Invalid Argument, ammount must be > zero\n");
 690                 return ;
 691         }
 692
 693         // Handle effective users
 694         if( Client->EffectiveUID != -1 ) {
 695                 thisUid = Client->EffectiveUID;
 696         }
 697         else {
 698                 thisUid = Client->UID;
 699         }
 700
 701         // Do give
 702         switch( DispenseDonate(Client->UID, thisUid, iAmmount, reason) )
 703         {
 704         case 0:
 705                 sendf(Client->Socket, "200 Give OK\n");
 706                 return ;
 707         case 2:
 708                 sendf(Client->Socket, "402 Poor You\n");
 709                 return ;
 710         default:
 711                 sendf(Client->Socket, "500 Unknown error\n");
 712                 return ;
 713         }
 714 }
 715
 716 void Server_Cmd_ADD(tClient *Client, char *Args)
 717 {
 718         char    *user, *ammount, *reason;
 719          int    uid, iAmmount;
 720
 721         if( !Client->bIsAuthed ) {
 722                 sendf(Client->Socket, "401 Not Authenticated\n");
 723                 return ;
 724         }
 725
 726         user = Args;
 727
 728         ammount = strchr(Args, ' ');
 729         if( !ammount ) {
 730                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
 731                 return ;
 732         }
 733         *ammount = '\0';
 734         ammount ++;
 735
 736         reason = strchr(ammount, ' ');
 737         if( !reason ) {
 738                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
 739                 return ;
 740         }
 741         *reason = '\0';
 742         reason ++;
 743
 744         // Check user permissions
 745         if( !(Bank_GetFlags(Client->UID) & (USER_FLAG_COKE|USER_FLAG_ADMIN))  ) {
 746                 sendf(Client->Socket, "403 Not in coke\n");
 747                 return ;
 748         }
 749
 750         // Get recipient
 751         uid = Bank_GetAcctByName(user);
 752         if( uid == -1 ) {
 753                 sendf(Client->Socket, "404 Invalid user\n");
 754                 return ;
 755         }
 756
 757         // You can't alter an internal account
 758         if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
 759                 sendf(Client->Socket, "404 Invalid user\n");
 760                 return ;
 761         }
 762
 763         // Parse ammount
 764         iAmmount = atoi(ammount);
 765         if( iAmmount == 0 && ammount[0] != '0' ) {
 766                 sendf(Client->Socket, "407 Invalid Argument\n");
 767                 return ;
 768         }
 769
 770         // Do give
 771         switch( DispenseAdd(Client->UID, uid, iAmmount, reason) )
 772         {
 773         case 0:
 774                 sendf(Client->Socket, "200 Add OK\n");
 775                 return ;
 776         case 2:
 777                 sendf(Client->Socket, "402 Poor Guy\n");
 778                 return ;
 779         default:
 780                 sendf(Client->Socket, "500 Unknown error\n");
 781                 return ;
 782         }
 783 }
 784
 785 void Server_Cmd_SET(tClient *Client, char *Args)
 786 {
 787         char    *user, *ammount, *reason;
 788          int    uid, iAmmount;
 789
 790         if( !Client->bIsAuthed ) {
 791                 sendf(Client->Socket, "401 Not Authenticated\n");
 792                 return ;
 793         }
 794
 795         user = Args;
 796
 797         ammount = strchr(Args, ' ');
 798         if( !ammount ) {
 799                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
 800                 return ;
 801         }
 802         *ammount = '\0';
 803         ammount ++;
 804
 805         reason = strchr(ammount, ' ');
 806         if( !reason ) {
 807                 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
 808                 return ;
 809         }
 810         *reason = '\0';
 811         reason ++;
 812
 813         // Check user permissions
 814         if( !(Bank_GetFlags(Client->UID) & USER_FLAG_ADMIN)  ) {
 815                 sendf(Client->Socket, "403 Not an admin\n");
 816                 return ;
 817         }
 818
 819         // Get recipient
 820         uid = Bank_GetAcctByName(user);
 821         if( uid == -1 ) {
 822                 sendf(Client->Socket, "404 Invalid user\n");
 823                 return ;
 824         }
 825
 826         // You can't alter an internal account
 827         if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
 828                 sendf(Client->Socket, "404 Invalid user\n");
 829                 return ;
 830         }
 831
 832         // Parse ammount
 833         iAmmount = atoi(ammount);
 834         if( iAmmount == 0 && ammount[0] != '0' ) {
 835                 sendf(Client->Socket, "407 Invalid Argument\n");
 836                 return ;
 837         }
 838
 839         // Do give
 840         switch( DispenseSet(Client->UID, uid, iAmmount, reason) )
 841         {
 842         case 0:
 843                 sendf(Client->Socket, "200 Add OK\n");
 844                 return ;
 845         case 2:
 846                 sendf(Client->Socket, "402 Poor Guy\n");
 847                 return ;
 848         default:
 849                 sendf(Client->Socket, "500 Unknown error\n");
 850                 return ;
 851         }
 852 }
 853
 854 void Server_Cmd_ENUMUSERS(tClient *Client, char *Args)
 855 {
 856          int    i, numRet = 0;
 857         tAcctIterator   *it;
 858          int    maxBal = INT_MAX, minBal = INT_MIN;
 859          int    flagMask = 0, flagVal = 0;
 860          int    sort = BANK_ITFLAG_SORT_NAME;
 861         time_t  lastSeenAfter=0, lastSeenBefore=0;
 862
 863          int    flags;  // Iterator flags
 864          int    balValue;       // Balance value for iterator
 865         time_t  timeValue;      // Time value for iterator
 866
 867         // Parse arguments
 868         if( Args && strlen(Args) )
 869         {
 870                 char    *space = Args, *type, *val;
 871                 do
 872                 {
 873                         type = space;
 874                         // Get next space
 875                         space = strchr(space, ' ');
 876                         if(space)       *space = '\0';
 877
 878                         // Get type
 879                         val = strchr(type, ':');
 880                         if( val ) {
 881                                 *val = '\0';
 882                                 val ++;
 883
 884                                 // Types
 885                                 // - Minium Balance
 886                                 if( strcmp(type, "min_balance") == 0 ) {
 887                                         minBal = atoi(val);
 888                                 }
 889                                 // - Maximum Balance
 890                                 else if( strcmp(type, "max_balance") == 0 ) {
 891                                         maxBal = atoi(val);
 892                                 }
 893                                 // - Flags
 894                                 else if( strcmp(type, "flags") == 0 ) {
 895                                         if( Server_int_ParseFlags(Client, val, &flagMask, &flagVal) )
 896                                                 return ;
 897                                 }
 898                                 // - Last seen before timestamp
 899                                 else if( strcmp(type, "last_seen_before") == 0 ) {
 900                                         lastSeenAfter = atoll(val);
 901                                 }
 902                                 // - Last seen after timestamp
 903                                 else if( strcmp(type, "last_seen_after") == 0 ) {
 904                                         lastSeenAfter = atoll(val);
 905                                 }
 906                                 // - Sorting
 907                                 else if( strcmp(type, "sort") == 0 ) {
 908                                         char    *dash = strchr(val, '-');
 909                                         if( dash ) {
 910                                                 *dash = '\0';
 911                                                 dash ++;
 912                                         }
 913                                         if( strcmp(val, "name") == 0 ) {
 914                                                 sort = BANK_ITFLAG_SORT_NAME;
 915                                         }
 916                                         else if( strcmp(val, "balance") == 0 ) {
 917                                                 sort = BANK_ITFLAG_SORT_BAL;
 918                                         }
 919                                         else if( strcmp(val, "lastseen") == 0 ) {
 920                                                 sort = BANK_ITFLAG_SORT_LASTSEEN;
 921                                         }
 922                                         else {
 923                                                 sendf(Client->Socket, "407 Unknown sort field ('%s')\n", val);
 924                                                 return ;
 925                                         }
 926                                         // Handle sort direction
 927                                         if( dash ) {
 928                                                 if( strcmp(dash, "desc") == 0 ) {
 929                                                         sort |= BANK_ITFLAG_REVSORT;
 930                                                 }
 931                                                 else {
 932                                                         sendf(Client->Socket, "407 Unknown sort direction '%s'\n", dash);
 933                                                         return ;
 934                                                 }
 935                                                 dash[-1] = '-';
 936                                         }
 937                                 }
 938                                 else {
 939                                         sendf(Client->Socket, "407 Unknown argument to ENUM_USERS '%s:%s'\n", type, val);
 940                                         return ;
 941                                 }
 942
 943                                 val[-1] = ':';
 944                         }
 945                         else {
 946                                 sendf(Client->Socket, "407 Unknown argument to ENUM_USERS '%s'\n", type);
 947                                 return ;
 948                         }
 949
 950                         // Eat whitespace
 951                         if( space ) {
 952                                 *space = ' ';   // Repair (to be nice)
 953                                 space ++;
 954                                 while(*space == ' ')    space ++;
 955                         }
 956                 }       while(space);
 957         }
 958
 959         // Create iterator
 960         if( maxBal != INT_MAX ) {
 961                 flags = sort|BANK_ITFLAG_MAXBALANCE;
 962                 balValue = maxBal;
 963         }
 964         else if( minBal != INT_MIN ) {
 965                 flags = sort|BANK_ITFLAG_MINBALANCE;
 966                 balValue = minBal;
 967         }
 968         else {
 969                 flags = sort;
 970                 balValue = 0;
 971         }
 972         if( lastSeenBefore ) {
 973                 timeValue = lastSeenBefore;
 974                 flags |= BANK_ITFLAG_SEENBEFORE;
 975         }
 976         else if( lastSeenAfter ) {
 977                 timeValue = lastSeenAfter;
 978                 flags |= BANK_ITFLAG_SEENAFTER;
 979         }
 980         else {
 981                 timeValue = 0;
 982         }
 983         it = Bank_Iterator(flagMask, flagVal, flags, balValue, timeValue);
 984
 985         // Get return number
 986         while( (i = Bank_IteratorNext(it)) != -1 )
 987         {
 988                 int bal = Bank_GetBalance(i);
 989
 990                 if( bal == INT_MIN )    continue;
 991
 992                 if( bal < minBal )      continue;
 993                 if( bal > maxBal )      continue;
 994
 995                 numRet ++;
 996         }
 997
 998         Bank_DelIterator(it);
 999
1000         // Send count
1001         sendf(Client->Socket, "201 Users %i\n", numRet);
1002
1003
1004         // Create iterator
1005         it = Bank_Iterator(flagMask, flagVal, flags, balValue, timeValue);
1006
1007         while( (i = Bank_IteratorNext(it)) != -1 )
1008         {
1009                 int bal = Bank_GetBalance(i);
1010
1011                 if( bal == INT_MIN )    continue;
1012
1013                 if( bal < minBal )      continue;
1014                 if( bal > maxBal )      continue;
1015
1016                 _SendUserInfo(Client, i);
1017         }
1018
1019         Bank_DelIterator(it);
1020
1021         sendf(Client->Socket, "200 List End\n");
1022 }
1023
1024 void Server_Cmd_USERINFO(tClient *Client, char *Args)
1025 {
1026          int    uid;
1027         char    *user = Args;
1028         char    *space;
1029
1030         space = strchr(user, ' ');
1031         if(space)       *space = '\0';
1032
1033         // Get recipient
1034         uid = Bank_GetAcctByName(user);
1035         if( uid == -1 ) {
1036                 sendf(Client->Socket, "404 Invalid user");
1037                 return ;
1038         }
1039
1040         _SendUserInfo(Client, uid);
1041 }
1042
1043 void _SendUserInfo(tClient *Client, int UserID)
1044 {
1045         char    *type, *disabled="", *door="";
1046          int    flags = Bank_GetFlags(UserID);
1047
1048         if( flags & USER_FLAG_INTERNAL ) {
1049                 type = "internal";
1050         }
1051         else if( flags & USER_FLAG_COKE ) {
1052                 if( flags & USER_FLAG_ADMIN )
1053                         type = "coke,admin";
1054                 else
1055                         type = "coke";
1056         }
1057         else if( flags & USER_FLAG_ADMIN ) {
1058                 type = "admin";
1059         }
1060         else {
1061                 type = "user";
1062         }
1063
1064         if( flags & USER_FLAG_DISABLED )
1065                 disabled = ",disabled";
1066         if( flags & USER_FLAG_DOORGROUP )
1067                 door = ",door";
1068
1069         // TODO: User flags/type
1070         sendf(
1071                 Client->Socket, "202 User %s %i %s%s\n",
1072                 Bank_GetAcctName(UserID), Bank_GetBalance(UserID),
1073                 type, disabled
1074                 );
1075 }
1076
1077 void Server_Cmd_USERADD(tClient *Client, char *Args)
1078 {
1079         char    *username, *space;
1080
1081         // Check permissions
1082         if( !(Bank_GetFlags(Client->UID) & USER_FLAG_ADMIN) ) {
1083                 sendf(Client->Socket, "403 Not a coke admin\n");
1084                 return ;
1085         }
1086
1087         // Read arguments
1088         username = Args;
1089         while( *username == ' ' )       username ++;
1090         space = strchr(username, ' ');
1091         if(space)       *space = '\0';
1092
1093         // Try to create user
1094         if( Bank_CreateAcct(username) == -1 ) {
1095                 sendf(Client->Socket, "404 User exists\n");
1096                 return ;
1097         }
1098
1099         {
1100                 char    *thisName = Bank_GetAcctName(Client->UID);
1101                 Log_Info("Account '%s' created by '%s'", username, thisName);
1102                 free(thisName);
1103         }
1104
1105         sendf(Client->Socket, "200 User Added\n");
1106 }
1107
1108 void Server_Cmd_USERFLAGS(tClient *Client, char *Args)
1109 {
1110         char    *username, *flags;
1111         char    *space;
1112          int    mask=0, value=0;
1113          int    uid;
1114
1115         // Check permissions
1116         if( !(Bank_GetFlags(Client->UID) & USER_FLAG_ADMIN) ) {
1117                 sendf(Client->Socket, "403 Not a coke admin\n");
1118                 return ;
1119         }
1120
1121         // Read arguments
1122         // - Username
1123         username = Args;
1124         while( *username == ' ' )       username ++;
1125         space = strchr(username, ' ');
1126         if(!space) {
1127                 sendf(Client->Socket, "407 USER_FLAGS requires 2 arguments, 1 given\n");
1128                 return ;
1129         }
1130         *space = '\0';
1131         // - Flags
1132         flags = space + 1;
1133         while( *flags == ' ' )  flags ++;
1134         space = strchr(flags, ' ');
1135         if(space)       *space = '\0';
1136
1137         // Get UID
1138         uid = Bank_GetAcctByName(username);
1139         if( uid == -1 ) {
1140                 sendf(Client->Socket, "404 User '%s' not found\n", username);
1141                 return ;
1142         }
1143
1144         // Parse flags
1145         if( Server_int_ParseFlags(Client, flags, &mask, &value) )
1146                 return ;
1147
1148         // Apply flags
1149         Bank_SetFlags(uid, mask, value);
1150
1151         // Return OK
1152         sendf(Client->Socket, "200 User Updated\n");
1153 }
1154
1155 // --- INTERNAL HELPERS ---
1156 int sendf(int Socket, const char *Format, ...)
1157 {
1158         va_list args;
1159          int    len;
1160
1161         va_start(args, Format);
1162         len = vsnprintf(NULL, 0, Format, args);
1163         va_end(args);
1164
1165         {
1166                 char    buf[len+1];
1167                 va_start(args, Format);
1168                 vsnprintf(buf, len+1, Format, args);
1169                 va_end(args);
1170
1171                 #if DEBUG_TRACE_CLIENT
1172                 printf("sendf: %s", buf);
1173                 #endif
1174
1175                 return send(Socket, buf, len, 0);
1176         }
1177 }
1178
1179 int Server_int_ParseFlags(tClient *Client, const char *Str, int *Mask, int *Value)
1180 {
1181         struct {
1182                 const char      *Name;
1183                  int    Mask;
1184                  int    Value;
1185         }       cFLAGS[] = {
1186                  {"disabled", USER_FLAG_DISABLED, USER_FLAG_DISABLED}
1187                 ,{"door", USER_FLAG_DOORGROUP, USER_FLAG_DOORGROUP}
1188                 ,{"coke", USER_FLAG_COKE, USER_FLAG_COKE}
1189                 ,{"admin", USER_FLAG_ADMIN, USER_FLAG_ADMIN}
1190                 ,{"internal", USER_FLAG_INTERNAL, USER_FLAG_INTERNAL}
1191         };
1192         const int       ciNumFlags = sizeof(cFLAGS)/sizeof(cFLAGS[0]);
1193
1194         char    *space;
1195
1196         *Mask = 0;
1197         *Value = 0;
1198
1199         do {
1200                  int    bRemove = 0;
1201                  int    i;
1202                  int    len;
1203
1204                 while( *Str == ' ' )    Str ++; // Eat whitespace
1205                 space = strchr(Str, ',');       // Find the end of the flag
1206                 if(space)
1207                         len = space - Str;
1208                 else
1209                         len = strlen(Str);
1210
1211                 // Check for inversion/removal
1212                 if( *Str == '!' || *Str == '-' ) {
1213                         bRemove = 1;
1214                         Str ++;
1215                 }
1216                 else if( *Str == '+' ) {
1217                         Str ++;
1218                 }
1219
1220                 // Check flag values
1221                 for( i = 0; i < ciNumFlags; i ++ )
1222                 {
1223                         if( strncmp(Str, cFLAGS[i].Name, len) == 0 ) {
1224                                 *Mask |= cFLAGS[i].Mask;
1225                                 *Value &= ~cFLAGS[i].Mask;
1226                                 if( !bRemove )
1227                                         *Value |= cFLAGS[i].Value;
1228                                 break;
1229                         }
1230                 }
1231
1232                 // Error check
1233                 if( i == ciNumFlags ) {
1234                         char    val[len+1];
1235                         strncpy(val, Str, len+1);
1236                         sendf(Client->Socket, "407 Unknown flag value '%s'\n", val);
1237                         return -1;
1238                 }
1239
1240                 Str = space + 1;
1241         } while(space);
1242
1243         return 0;
1244 }