3 * UCC (University [of WA] Computer Club) Electronic Accounting System
5 * server.c - Client Server Code
7 * This file is licenced under the 3-clause BSD Licence. See the file
8 * COPYING for full details.
13 #include <sys/socket.h>
14 #include <netinet/in.h>
15 #include <arpa/inet.h>
21 #define DEBUG_TRACE_CLIENT 0
24 #define MAX_CONNECTION_QUEUE 5
25 #define INPUT_BUFFER_SIZE 256
27 #define HASH_TYPE SHA1
28 #define HASH_LENGTH 20
30 #define MSG_STR_TOO_LONG "499 Command too long (limit "EXPSTR(INPUT_BUFFER_SIZE)")\n"
33 typedef struct sClient
35 int Socket; // Client socket ID
38 int bIsTrusted; // Is the connection from a trusted host/port
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);
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_ADD(tClient *Client, char *Args);
63 void Server_Cmd_ENUMUSERS(tClient *Client, char *Args);
64 void Server_Cmd_USERINFO(tClient *Client, char *Args);
65 void _SendUserInfo(tClient *Client, int UserID);
66 void Server_Cmd_USERADD(tClient *Client, char *Args);
67 void Server_Cmd_USERFLAGS(tClient *Client, char *Args);
69 int sendf(int Socket, const char *Format, ...);
73 const struct sClientCommand {
75 void (*Function)(tClient *Client, char *Arguments);
76 } gaServer_Commands[] = {
77 {"USER", Server_Cmd_USER},
78 {"PASS", Server_Cmd_PASS},
79 {"AUTOAUTH", Server_Cmd_AUTOAUTH},
80 {"SETEUSER", Server_Cmd_SETEUSER},
81 {"ENUM_ITEMS", Server_Cmd_ENUMITEMS},
82 {"ITEM_INFO", Server_Cmd_ITEMINFO},
83 {"DISPENSE", Server_Cmd_DISPENSE},
84 {"GIVE", Server_Cmd_GIVE},
85 {"ADD", Server_Cmd_ADD},
86 {"ENUM_USERS", Server_Cmd_ENUMUSERS},
87 {"USER_INFO", Server_Cmd_USERINFO},
88 {"USER_ADD", Server_Cmd_USERADD},
89 {"USER_FLAGS", Server_Cmd_USERFLAGS}
91 #define NUM_COMMANDS ((int)(sizeof(gaServer_Commands)/sizeof(gaServer_Commands[0])))
94 int giServer_Port = 1020;
95 int giServer_NextClientID = 1;
100 * \brief Open listenting socket and serve connections
102 void Server_Start(void)
105 struct sockaddr_in server_addr, client_addr;
107 atexit(Server_Cleanup);
110 giServer_Socket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
111 if( giServer_Socket < 0 ) {
112 fprintf(stderr, "ERROR: Unable to create server socket\n");
116 // Make listen address
117 memset(&server_addr, 0, sizeof(server_addr));
118 server_addr.sin_family = AF_INET; // Internet Socket
119 server_addr.sin_addr.s_addr = htonl(INADDR_ANY); // Listen on all interfaces
120 server_addr.sin_port = htons(giServer_Port); // Port
123 if( bind(giServer_Socket, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0 ) {
124 fprintf(stderr, "ERROR: Unable to bind to 0.0.0.0:%i\n", giServer_Port);
130 if( listen(giServer_Socket, MAX_CONNECTION_QUEUE) < 0 ) {
131 fprintf(stderr, "ERROR: Unable to listen to socket\n");
136 printf("Listening on 0.0.0.0:%i\n", giServer_Port);
140 uint len = sizeof(client_addr);
143 client_socket = accept(giServer_Socket, (struct sockaddr *) &client_addr, &len);
144 if(client_socket < 0) {
145 fprintf(stderr, "ERROR: Unable to accept client connection\n");
149 if(giDebugLevel >= 2) {
150 char ipstr[INET_ADDRSTRLEN];
151 inet_ntop(AF_INET, &client_addr.sin_addr, ipstr, INET_ADDRSTRLEN);
152 printf("Client connection from %s:%i\n",
153 ipstr, ntohs(client_addr.sin_port));
156 // Trusted Connections
157 if( ntohs(client_addr.sin_port) < 1024 )
159 // TODO: Make this runtime configurable
160 switch( ntohl( client_addr.sin_addr.s_addr ) )
162 case 0x7F000001: // 127.0.0.1 localhost
163 //case 0x825E0D00: // 130.95.13.0
164 case 0x825E0D12: // 130.95.13.18 mussel
165 case 0x825E0D17: // 130.95.13.23 martello
173 // TODO: Multithread this?
174 Server_HandleClient(client_socket, bTrusted);
176 close(client_socket);
180 void Server_Cleanup(void)
182 printf("Close(%i)\n", giServer_Socket);
183 close(giServer_Socket);
187 * \brief Reads from a client socket and parses the command strings
188 * \param Socket Client socket number/handle
189 * \param bTrusted Is the client trusted?
191 void Server_HandleClient(int Socket, int bTrusted)
193 char inbuf[INPUT_BUFFER_SIZE];
195 int remspace = INPUT_BUFFER_SIZE-1;
199 memset(&clientInfo, 0, sizeof(clientInfo));
201 // Initialise Client info
202 clientInfo.Socket = Socket;
203 clientInfo.ID = giServer_NextClientID ++;
204 clientInfo.bIsTrusted = bTrusted;
209 * - The `buf` and `remspace` variables allow a line to span several
210 * calls to recv(), if a line is not completed in one recv() call
211 * it is saved to the beginning of `inbuf` and `buf` is updated to
214 while( (bytes = recv(Socket, buf, remspace, 0)) > 0 )
217 buf[bytes] = '\0'; // Allow us to use stdlib string functions on it
221 while( (eol = strchr(start, '\n')) )
225 Server_ParseClientCommand(&clientInfo, start);
230 // Check if there was an incomplete line
231 if( *start != '\0' ) {
232 int tailBytes = bytes - (start-buf);
233 // Roll back in buffer
234 memcpy(inbuf, start, tailBytes);
235 remspace -= tailBytes;
237 send(Socket, MSG_STR_TOO_LONG, sizeof(MSG_STR_TOO_LONG), 0);
239 remspace = INPUT_BUFFER_SIZE - 1;
244 remspace = INPUT_BUFFER_SIZE - 1;
250 fprintf(stderr, "ERROR: Unable to recieve from client on socket %i\n", Socket);
254 if(giDebugLevel >= 2) {
255 printf("Client %i: Disconnected\n", clientInfo.ID);
260 * \brief Parses a client command and calls the required helper function
261 * \param Client Pointer to client state structure
262 * \param CommandString Command from client (single line of the command)
263 * \return Heap String to return to the client
265 void Server_ParseClientCommand(tClient *Client, char *CommandString)
274 // Split at first space
275 space = strchr(CommandString, ' ');
282 while( *space == ' ' ) space ++;
287 for( i = 0; args[i]; )
289 while( CommandString[i] != ' ' ) {
290 if( CommandString[i] == '"' ) {
291 while( !(CommandString[i] != '\\' CommandString[i+1] == '"' ) )
298 while( CommandString[i] == ' ' ) i ++;
305 for( i = 0; i < NUM_COMMANDS; i++ )
307 if(strcmp(CommandString, gaServer_Commands[i].Name) == 0) {
308 gaServer_Commands[i].Function(Client, args);
313 sendf(Client->Socket, "400 Unknown Command\n");
320 * \brief Set client username
322 * Usage: USER <username>
324 void Server_Cmd_USER(tClient *Client, char *Args)
326 char *space = strchr(Args, ' ');
327 if(space) *space = '\0'; // Remove characters after the ' '
331 printf("Client %i authenticating as '%s'\n", Client->ID, Args);
335 free(Client->Username);
336 Client->Username = strdup(Args);
339 // Create a salt (that changes if the username is changed)
340 // Yes, I know, I'm a little paranoid, but who isn't?
341 Client->Salt[0] = 0x21 + (rand()&0x3F);
342 Client->Salt[1] = 0x21 + (rand()&0x3F);
343 Client->Salt[2] = 0x21 + (rand()&0x3F);
344 Client->Salt[3] = 0x21 + (rand()&0x3F);
345 Client->Salt[4] = 0x21 + (rand()&0x3F);
346 Client->Salt[5] = 0x21 + (rand()&0x3F);
347 Client->Salt[6] = 0x21 + (rand()&0x3F);
348 Client->Salt[7] = 0x21 + (rand()&0x3F);
350 // TODO: Also send hash type to use, (SHA1 or crypt according to [DAA])
351 sendf(Client->Socket, "100 SALT %s\n", Client->Salt);
353 sendf(Client->Socket, "100 User Set\n");
358 * \brief Authenticate as a user
362 void Server_Cmd_PASS(tClient *Client, char *Args)
364 char *space = strchr(Args, ' ');
365 if(space) *space = '\0'; // Remove characters after the ' '
367 // Pass on to cokebank
368 Client->UID = Bank_GetUserAuth(Client->Salt, Client->Username, Args);
370 if( Client->UID != -1 ) {
371 Client->bIsAuthed = 1;
372 sendf(Client->Socket, "200 Auth OK\n");
376 sendf(Client->Socket, "401 Auth Failure\n");
380 * \brief Authenticate as a user without a password
382 * Usage: AUTOAUTH <user>
384 void Server_Cmd_AUTOAUTH(tClient *Client, char *Args)
386 char *space = strchr(Args, ' ');
387 if(space) *space = '\0'; // Remove characters after the ' '
390 if( !Client->bIsTrusted ) {
392 printf("Client %i: Untrusted client attempting to AUTOAUTH\n", Client->ID);
393 sendf(Client->Socket, "401 Untrusted\n");
398 Client->UID = Bank_GetAcctByName( Args );
399 if( Client->UID < 0 ) {
401 printf("Client %i: Unknown user '%s'\n", Client->ID, Args);
402 sendf(Client->Socket, "401 Auth Failure\n");
406 // You can't be an internal account
407 if( Bank_GetFlags(Client->UID) & USER_FLAG_INTERNAL ) {
409 sendf(Client->Socket, "401 Auth Failure\n");
414 printf("Client %i: Authenticated as '%s' (%i)\n", Client->ID, Args, Client->UID);
416 sendf(Client->Socket, "200 Auth OK\n");
420 * \brief Set effective user
422 void Server_Cmd_SETEUSER(tClient *Client, char *Args)
426 space = strchr(Args, ' ');
428 if(space) *space = '\0';
430 if( !strlen(Args) ) {
431 sendf(Client->Socket, "407 SETEUSER expects an argument\n");
435 // Check user permissions
436 if( !(Bank_GetFlags(Client->UID) & USER_FLAG_COKE) ) {
437 sendf(Client->Socket, "403 Not in coke\n");
442 Client->EffectiveUID = Bank_GetAcctByName(Args);
443 if( Client->EffectiveUID == -1 ) {
444 sendf(Client->Socket, "404 User not found\n");
448 // You can't be an internal account
449 if( Bank_GetFlags(Client->EffectiveUID) & USER_FLAG_INTERNAL ) {
450 Client->EffectiveUID = -1;
451 sendf(Client->Socket, "404 User not found\n");
455 sendf(Client->Socket, "200 User set\n");
459 * \brief Enumerate the items that the server knows about
461 void Server_Cmd_ENUMITEMS(tClient *Client, char *Args)
465 if( Args != NULL && strlen(Args) ) {
466 sendf(Client->Socket, "407 ENUM_ITEMS takes no arguments\n");
470 sendf(Client->Socket, "201 Items %i\n", giNumItems);
472 for( i = 0; i < giNumItems; i ++ ) {
473 sendf(Client->Socket,
474 "202 Item %s:%i %i %s\n",
475 gaItems[i].Handler->Name, gaItems[i].ID, gaItems[i].Price, gaItems[i].Name
479 sendf(Client->Socket, "200 List end\n");
482 tItem *_GetItemFromString(char *String)
486 char *colon = strchr(String, ':');
498 for( i = 0; i < giNumHandlers; i ++ )
500 if( strcmp(gaHandlers[i]->Name, type) == 0) {
501 handler = gaHandlers[i];
510 for( i = 0; i < giNumItems; i ++ )
512 if( gaItems[i].Handler != handler ) continue;
513 if( gaItems[i].ID != num ) continue;
520 * \brief Fetch information on a specific item
522 void Server_Cmd_ITEMINFO(tClient *Client, char *Args)
524 tItem *item = _GetItemFromString(Args);
527 sendf(Client->Socket, "406 Bad Item ID\n");
531 sendf(Client->Socket,
532 "202 Item %s:%i %i %s\n",
533 item->Handler->Name, item->ID, item->Price, item->Name
537 void Server_Cmd_DISPENSE(tClient *Client, char *Args)
543 if( !Client->bIsAuthed ) {
544 sendf(Client->Socket, "401 Not Authenticated\n");
548 item = _GetItemFromString(Args);
550 sendf(Client->Socket, "406 Bad Item ID\n");
554 if( Client->EffectiveUID != -1 ) {
555 uid = Client->EffectiveUID;
561 switch( ret = DispenseItem( Client->UID, uid, item ) )
563 case 0: sendf(Client->Socket, "200 Dispense OK\n"); return ;
564 case 1: sendf(Client->Socket, "501 Unable to dispense\n"); return ;
565 case 2: sendf(Client->Socket, "402 Poor You\n"); return ;
567 sendf(Client->Socket, "500 Dispense Error\n");
572 void Server_Cmd_GIVE(tClient *Client, char *Args)
574 char *recipient, *ammount, *reason;
578 if( !Client->bIsAuthed ) {
579 sendf(Client->Socket, "401 Not Authenticated\n");
585 ammount = strchr(Args, ' ');
587 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
593 reason = strchr(ammount, ' ');
595 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
602 uid = Bank_GetAcctByName(recipient);
604 sendf(Client->Socket, "404 Invalid target user\n");
608 // You can't alter an internal account
609 if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
610 sendf(Client->Socket, "404 Invalid target user\n");
615 iAmmount = atoi(ammount);
616 if( iAmmount <= 0 ) {
617 sendf(Client->Socket, "407 Invalid Argument, ammount must be > zero\n");
621 if( Client->EffectiveUID != -1 ) {
622 thisUid = Client->EffectiveUID;
625 thisUid = Client->UID;
629 switch( DispenseGive(Client->UID, thisUid, uid, iAmmount, reason) )
632 sendf(Client->Socket, "200 Give OK\n");
635 sendf(Client->Socket, "402 Poor You\n");
638 sendf(Client->Socket, "500 Unknown error\n");
643 void Server_Cmd_ADD(tClient *Client, char *Args)
645 char *user, *ammount, *reason;
648 if( !Client->bIsAuthed ) {
649 sendf(Client->Socket, "401 Not Authenticated\n");
655 ammount = strchr(Args, ' ');
657 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 1 encountered\n");
663 reason = strchr(ammount, ' ');
665 sendf(Client->Socket, "407 Invalid Argument, expected 3 parameters, 2 encountered\n");
671 // Check user permissions
672 if( !(Bank_GetFlags(Client->UID) & USER_FLAG_COKE) ) {
673 sendf(Client->Socket, "403 Not in coke\n");
678 uid = Bank_GetAcctByName(user);
680 sendf(Client->Socket, "404 Invalid user\n");
684 // You can't alter an internal account
685 if( Bank_GetFlags(uid) & USER_FLAG_INTERNAL ) {
686 sendf(Client->Socket, "404 Invalid user\n");
691 iAmmount = atoi(ammount);
692 if( iAmmount == 0 && ammount[0] != '0' ) {
693 sendf(Client->Socket, "407 Invalid Argument\n");
698 switch( DispenseAdd(uid, Client->UID, iAmmount, reason) )
701 sendf(Client->Socket, "200 Add OK\n");
704 sendf(Client->Socket, "402 Poor Guy\n");
707 sendf(Client->Socket, "500 Unknown error\n");
712 void Server_Cmd_ENUMUSERS(tClient *Client, char *Args)
715 int maxBal = INT_MAX, minBal = INT_MIN;
717 int sort = BANK_ITFLAG_SORT_NAME;
720 if( Args && strlen(Args) )
722 char *min = Args, *max;
724 max = strchr(Args, ' ');
730 // If <minBal> != "-"
731 if( strcmp(min, "-") != 0 )
733 // If <maxBal> != "-"
734 if( max && strcmp(max, "-") != 0 )
739 if( maxBal != INT_MAX )
740 it = Bank_Iterator(0, 0, sort|BANK_ITFLAG_MAXBALANCE, maxBal, 0);
741 else if( minBal != INT_MIN )
742 it = Bank_Iterator(0, 0, sort|BANK_ITFLAG_MINBALANCE, minBal, 0);
744 it = Bank_Iterator(0, 0, sort, 0, 0);
747 while( (i = Bank_IteratorNext(it)) != -1 )
749 int bal = Bank_GetBalance(i);
751 if( bal == INT_MIN ) continue;
753 if( bal < minBal ) continue;
754 if( bal > maxBal ) continue;
759 Bank_DelIterator(it);
762 sendf(Client->Socket, "201 Users %i\n", numRet);
766 if( maxBal != INT_MAX )
767 it = Bank_Iterator(0, 0, sort|BANK_ITFLAG_MAXBALANCE, maxBal, 0);
768 else if( minBal != INT_MIN )
769 it = Bank_Iterator(0, 0, sort|BANK_ITFLAG_MINBALANCE, minBal, 0);
771 it = Bank_Iterator(0, 0, sort, 0, 0);
773 while( (i = Bank_IteratorNext(it)) != -1 )
775 int bal = Bank_GetBalance(i);
777 if( bal == INT_MIN ) continue;
779 if( bal < minBal ) continue;
780 if( bal > maxBal ) continue;
782 _SendUserInfo(Client, i);
785 Bank_DelIterator(it);
787 sendf(Client->Socket, "200 List End\n");
790 void Server_Cmd_USERINFO(tClient *Client, char *Args)
796 space = strchr(user, ' ');
797 if(space) *space = '\0';
800 uid = Bank_GetAcctByName(user);
802 sendf(Client->Socket, "404 Invalid user");
806 _SendUserInfo(Client, uid);
809 void _SendUserInfo(tClient *Client, int UserID)
811 char *type, *disabled="", *door="";
812 int flags = Bank_GetFlags(UserID);
814 if( flags & USER_FLAG_INTERNAL ) {
817 else if( flags & USER_FLAG_COKE ) {
818 if( flags & USER_FLAG_WHEEL )
823 else if( flags & USER_FLAG_WHEEL ) {
830 if( flags & USER_FLAG_DISABLED )
831 disabled = ",disabled";
832 if( flags & USER_FLAG_DOORGROUP )
835 // TODO: User flags/type
837 Client->Socket, "202 User %s %i %s%s\n",
838 Bank_GetAcctName(UserID), Bank_GetBalance(UserID),
843 void Server_Cmd_USERADD(tClient *Client, char *Args)
845 char *username, *space;
848 if( !(Bank_GetFlags(Client->UID) & USER_FLAG_WHEEL) ) {
849 sendf(Client->Socket, "403 Not Wheel\n");
855 while( *username == ' ' ) username ++;
856 space = strchr(username, ' ');
857 if(space) *space = '\0';
859 // Try to create user
860 if( Bank_CreateAcct(username) == -1 ) {
861 sendf(Client->Socket, "404 User exists\n");
865 sendf(Client->Socket, "200 User Added\n");
868 void Server_Cmd_USERFLAGS(tClient *Client, char *Args)
870 char *username, *flags;
876 if( !(Bank_GetFlags(Client->UID) & USER_FLAG_WHEEL) ) {
877 sendf(Client->Socket, "403 Not Wheel\n");
884 while( *username == ' ' ) username ++;
885 space = strchr(username, ' ');
887 sendf(Client->Socket, "407 USER_FLAGS requires 2 arguments, 1 given\n");
893 while( *flags == ' ' ) flags ++;
894 space = strchr(flags, ' ');
895 if(space) *space = '\0';
898 uid = Bank_GetAcctByName(username);
900 sendf(Client->Socket, "404 User '%s' not found\n", username);
913 {"disabled", USER_FLAG_DISABLED, USER_FLAG_DISABLED}
914 ,{"door", USER_FLAG_DOORGROUP, USER_FLAG_DOORGROUP}
915 ,{"coke", USER_FLAG_COKE, USER_FLAG_COKE}
916 ,{"wheel", USER_FLAG_WHEEL, USER_FLAG_WHEEL}
917 // ,{"internal", USER_FLAG_INTERNAL, USER_FLAG_INTERNAL}
919 const int ciNumFlags = sizeof(cFLAGS)/sizeof(cFLAGS[0]);
921 while( *flags == ' ' ) flags ++; // Eat whitespace
922 space = strchr(flags, ','); // Find the end of the flag
923 if(space) *space = '\0';
925 // Check for inversion/removal
926 if( *flags == '!' || *flags == '-' ) {
930 else if( *flags == '+' ) {
935 for( i = 0; i < ciNumFlags; i ++ )
937 if( strcmp(flags, cFLAGS[i].Name) == 0 ) {
938 mask |= cFLAGS[i].Mask;
939 value &= ~cFLAGS[i].Mask;
941 value |= cFLAGS[i].Value;
947 if( i == ciNumFlags ) {
948 sendf(Client->Socket, "407 Unknown flag value '%s'\n", flags);
956 Bank_SetFlags(uid, mask, value);
959 sendf(Client->Socket, "200 User Updated\n");
962 // --- INTERNAL HELPERS ---
963 int sendf(int Socket, const char *Format, ...)
968 va_start(args, Format);
969 len = vsnprintf(NULL, 0, Format, args);
974 va_start(args, Format);
975 vsnprintf(buf, len+1, Format, args);
978 #if DEBUG_TRACE_CLIENT
979 printf("sendf: %s", buf);
982 return send(Socket, buf, len, 0);