src/server/handler_door.c

   1 /*
   2  * OpenDispense 2
   3  * UCC (University [of WA] Computer Club) Electronic Accounting System
   4  *
   5  * handler_doror.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 #define USE_POPEN       0
  12
  13 #include "common.h"
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <sys/stat.h>
  18 #include <fcntl.h>
  19 #include <signal.h>
  20 #if !USE_POPEN
  21 # include <unistd.h>
  22 #endif
  23
  24 #define DOOR_UNLOCKED_DELAY     10      // 10 seconds before it re-locks
  25
  26 // === IMPORTS ===
  27
  28 // === PROTOTYPES ===
  29  int    Door_InitHandler();
  30  int    Door_CanDispense(int User, int Item);
  31  int    Door_DoDispense(int User, int Item);
  32
  33 // === GLOBALS ===
  34 tHandler        gDoor_Handler = {
  35         "door",
  36         Door_InitHandler,
  37         Door_CanDispense,
  38         Door_DoDispense
  39 };
  40 char    *gsDoor_Password = "";
  41
  42 // == CODE ===
  43 int Door_InitHandler(void)
  44 {
  45         return 0;
  46 }
  47
  48 /**
  49  */
  50 int Door_CanDispense(int User, int Item)
  51 {
  52         #if DEBUG
  53         printf("Door_CanDispense: (User=%i,Item=%i)\n", User, Item);
  54         #endif
  55         // Sanity please
  56         if( Item != 0 ) return -1;
  57
  58         if( !(Bank_GetFlags(User) & USER_FLAG_DOORGROUP) )
  59         {
  60                 #if DEBUG
  61                 printf("Door_CanDispense: User %i not in door\n", User);
  62                 #endif
  63                 return 1;
  64         }
  65
  66         #if DEBUG
  67         printf("Door_CanDispense: User %i can open the door\n", User);
  68         #endif
  69
  70         return 0;
  71 }
  72
  73 /**
  74  * \brief Actually do a dispense from the coke machine
  75  */
  76 int Door_DoDispense(int User, int Item)
  77 {
  78         FILE    *child_stdin;
  79         char    buf[512];
  80          int    stdin_pair[2];
  81          int    stdout_pair[2];
  82         pid_t   childPid;
  83
  84         #if DEBUG
  85         printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
  86         #endif
  87
  88         // Sanity please
  89         if( Item != 0 ) return -1;
  90
  91         // Check if user is in door
  92         if( !(Bank_GetFlags(User) & USER_FLAG_DOORGROUP) )
  93         {
  94                 #if DEBUG
  95                 printf("Door_CanDispense: User %i not in door\n", User);
  96                 #endif
  97                 return 1;
  98         }
  99
 100         // Create stdin/stdout
 101         if( pipe(stdin_pair) || pipe(stdout_pair) )
 102         {
 103                 perror("pipe");
 104                 return -1;
 105         }
 106
 107         childPid = fork();
 108
 109         if( childPid < 0 )
 110         {
 111                 perror("fork");
 112                 return -1;
 113         }
 114
 115         // Child process
 116         if( childPid == 0 )
 117         {
 118                 // Close write end of stdin, and set it to #0
 119                 close(stdin_pair[1]);   dup2(stdin_pair[0], 0);
 120                 // Close read end of stdout, and set it to #1
 121                 close(stdout_pair[0]);  dup2(stdout_pair[1], 1);
 122
 123                 execl("/bin/sh", "sh", "-c", "llogin door -w-", NULL);
 124                 perror("execl");
 125                 exit(-1);
 126         }
 127
 128         child_stdin = fdopen(stdin_pair[1], "w");
 129         close(stdin_pair[0]);   // child stdin read
 130         close(stdout_pair[1]);  // child stdout write
 131
 132         if(read(stdout_pair[1], buf, 512) < 0) {
 133                 #if DEBUG
 134                 printf("Door_DoDispense: fread fail\n");
 135                 #endif
 136                 return -1;
 137         }
 138
 139         // Send password
 140         if( fputs(gsDoor_Password, child_stdin) <= 0 ) {
 141                 #if DEBUG
 142                 printf("Door_DoDispense: fputs password\n");
 143                 #endif
 144                 return -1;
 145         }
 146         fputs("\n", child_stdin);
 147
 148
 149         #if DEBUG
 150         printf("Door_DoDispense: Door unlock\n");
 151         #endif
 152
 153         // ATH1 - Unlock door
 154         if( fputs("ATH1\n", child_stdin) <= 0) {
 155                 #if DEBUG
 156                 printf("Door_DoDispense: fputs unlock\n");
 157                 #endif
 158                 return -1;
 159         }
 160
 161         // Wait before re-locking
 162         sleep(DOOR_UNLOCKED_DELAY);
 163
 164
 165         #if DEBUG
 166         printf("Door_DoDispense: Door re-lock\n");
 167         #endif
 168
 169         // Re-lock the door
 170         if( fputs("ATH0\n", child_stdin) <= 0 ) {
 171                 #if DEBUG
 172                 printf("Door_DoDispense: fputs lock\n");
 173                 #endif
 174                 return -1;
 175         }
 176
 177         fclose(child_stdin);
 178         close(stdin_pair[1]);   // child stdin write
 179         close(stdout_pair[0]);  // child stdout read
 180
 181         #if DEBUG
 182         printf("Door_DoDispense: User %i opened door\n", User);
 183         #endif
 184
 185         return 0;
 186 }
 187