src/server/handler_door.c

   1 /*
   2  * OpenDispense 2
   3  * UCC (University [of WA] Computer Club) Electronic Accounting System
   4  *
   5  * handler_door.c - Door Relay code
   6  *
   7  * This file is licenced under the 3-clause BSD Licence. See the file
   8  * COPYING for full details.
   9  */
  10 #define DEBUG   1
  11
  12 #include "common.h"
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <signal.h>
  19 #include <unistd.h>
  20 #include <pty.h>
  21 #include <pthread.h>
  22 #include <semaphore.h>
  23 #include <errno.h>
  24 #include <stdbool.h>
  25
  26 #define DOOR_UNLOCKED_DELAY     10      // Time in seconds before the door re-locks
  27
  28 // === IMPORTS ===
  29
  30 // === PROTOTYPES ===
  31 void*   Door_Lock(void* Unused);
  32  int    Door_InitHandler();
  33  int    Door_CanDispense(int User, int Item);
  34  int    Door_DoDispense(int User, int Item);
  35
  36 // === GLOBALS ===
  37 tHandler        gDoor_Handler = {
  38         "door",
  39         Door_InitHandler,
  40         Door_CanDispense,
  41         Door_DoDispense
  42 };
  43 char    *gsDoor_SerialPort;     // Set from config in main.c
  44 sem_t   gDoor_UnlockSemaphore;
  45 pthread_t       gDoor_LockThread;
  46 bool    gbDoor_LockThreadStarted;
  47
  48 // === CODE ===
  49 void* Door_Lock(void* Unused __attribute__((unused)))
  50 {
  51         gbDoor_LockThreadStarted = true;
  52         while(1)
  53         {
  54                 sem_wait(&gDoor_UnlockSemaphore);
  55
  56                 int door_serial_handle = InitSerial(gsDoor_SerialPort, 9600);
  57                 if(door_serial_handle < 0)
  58                 {
  59                         fprintf(stderr, "Unable to open door serial '%s'\n", gsDoor_SerialPort);
  60                         perror("Opening door port");
  61                 }
  62
  63                 // Disable local echo
  64                 {
  65                         struct termios  info;
  66                         tcgetattr(door_serial_handle, &info);
  67                         info.c_cflag &= ~CLOCAL;
  68                         tcsetattr(door_serial_handle, TCSANOW, &info);
  69                 }
  70
  71                 if(write(door_serial_handle, "\xff\x01\x01", 3) != 3)   // Relay ON
  72                 {
  73                         fprintf(stderr, "Failed to write Relay ON (unlock) command, errstr: %s", strerror(errno));
  74                 }
  75
  76                 sleep(DOOR_UNLOCKED_DELAY);
  77
  78                 if(write(door_serial_handle, "\xff\x01\x00", 3) != 3)   // Relay OFF
  79                 {
  80                         fprintf(stderr, "Failed to write Relay OFF (lock) command, errstr: %s", strerror(errno));
  81                 }
  82
  83                 close(door_serial_handle);
  84         }
  85 }
  86
  87 int Door_InitHandler(void)
  88 {
  89         // Thread started later
  90
  91         return 0;
  92 }
  93
  94 /**
  95  */
  96 int Door_CanDispense(int User, int Item)
  97 {
  98         #if DEBUG
  99         printf("Door_CanDispense: (User=%i,Item=%i)\n", User, Item);
 100         #endif
 101         // Sanity please
 102         if( Item != 0 ) return -1;
 103
 104         if( !(Bank_GetFlags(User) & (USER_FLAG_DOORGROUP|USER_FLAG_ADMIN)) )
 105         {
 106                 #if DEBUG
 107                 printf("Door_CanDispense: User %i not in door\n", User);
 108                 #endif
 109                 return 1;
 110         }
 111
 112         #if DEBUG
 113         printf("Door_CanDispense: User %i can open the door\n", User);
 114         #endif
 115
 116         return 0;
 117 }
 118
 119 /**
 120  * \brief Actually do a dispense from the coke machine
 121  */
 122 int Door_DoDispense(int User, int Item)
 123 {
 124         #if DEBUG
 125         printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
 126         #endif
 127
 128         // Sanity please
 129         if( Item != 0 ) return -1;
 130
 131         // Check if user is in door
 132         if( !(Bank_GetFlags(User) & (USER_FLAG_DOORGROUP|USER_FLAG_ADMIN)) )
 133         {
 134                 #if DEBUG
 135                 printf("Door_CanDispense: User %i not in door\n", User);
 136                 #endif
 137                 return 1;
 138         }
 139
 140         // Door thread spun up here because program is forked after thread created
 141         if( !gbDoor_LockThreadStarted )
 142         {
 143                 // Initialize semaphore, triggers door lock release if semaphore is greater than 0
 144                 sem_init(&gDoor_UnlockSemaphore, 0, 0);
 145
 146                 pthread_create(&gDoor_LockThread, NULL, &Door_Lock, NULL);
 147         }
 148
 149         if(sem_post(&gDoor_UnlockSemaphore))
 150         {
 151                 perror("Failed to post \"Unlock Door\" semaphore, sem_post returned");
 152                 return -1;
 153         }
 154
 155         #if DEBUG
 156         printf("Door_DoDispense: User %i opened door\n", User);
 157         #endif
 158
 159         return 0;
 160 }