* This file is licenced under the 3-clause BSD Licence. See the file
* COPYING for full details.
*/
+#define DEBUG 1
+#define USE_POPEN 0
+
#include "common.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
-
-#define DEBUG 1
+#include <signal.h>
+#include <unistd.h>
+#include <sys/wait.h>
#define DOOR_UNLOCKED_DELAY 10 // 10 seconds before it re-locks
Door_DoDispense
};
char *gsDoor_Password = "";
-// int giDoor_SerialFD;
+volatile int giDoor_ChildStatus;
// == CODE ===
+void Door_SIGCHLDHandler(int signum)
+{
+ signum = 0;
+ giDoor_ChildStatus ++;
+ printf("SIGCHLD: giDoor_ChildStatus = %i \n", giDoor_ChildStatus);
+}
+
int Door_InitHandler(void)
-{
+{
+ signal(SIGCHLD, Door_SIGCHLDHandler);
return 0;
}
*/
int Door_DoDispense(int User, int Item)
{
- FILE *pipe;
- char buf[512]; // Buffer flush location - the sewer :)
+ FILE *child_stdin;
+ char buf[512];
+ int stdin_pair[2];
+ int stdout_pair[2];
+ pid_t childPid;
+ pid_t parentPid;
#if DEBUG
printf("Door_DoDispense: (User=%i,Item=%i)\n", User, Item);
return 1;
}
- // llogin or other
- pipe = popen("llogin door -w -", "w");
- if( !pipe || pipe == (void*)-1 ) {
+ // Create stdin/stdout
+ if( pipe(stdin_pair) || pipe(stdout_pair) )
+ {
+ perror("pipe");
+ return -1;
+ }
+
+ giDoor_ChildStatus = 0; // Set child status to zero
+ parentPid = getpid();
+ childPid = fork();
+
+ if( childPid < 0 )
+ {
+ perror("fork");
+ return -1;
+ }
+
+ // Child process
+ if( childPid == 0 )
+ {
+ // Close write end of stdin, and set it to #0
+ close(stdin_pair[1]); dup2(stdin_pair[0], 0);
+ // Close read end of stdout, and set it to #1
+ close(stdout_pair[0]); dup2(stdout_pair[1], 1);
+
+ //execl("/bin/sh", "sh", "-c", "llogin door -w-", NULL);
+ execl("/usr/bin/llogin", "llogin" "door" "-w-", NULL);
+ perror("execl");
+ exit(-1);
+ }
+
+ child_stdin = fdopen(stdin_pair[1], "w");
+ close(stdin_pair[0]); // child stdin read
+ close(stdout_pair[1]); // child stdout write
+
+ {
+ int len;
+ if( giDoor_ChildStatus || (len = read(stdout_pair[0], buf, 512)) < 0)
+ {
+ #if DEBUG
+ int child_exit;
+ waitpid(childPid, &child_exit, 0);
+ printf("Door_DoDispense: fread fail (child status %i)\n", child_exit);
+ #endif
+ return -1;
+ }
+ buf[len] = '\0';
+
+ #if DEBUG
+ printf("Door_DoDispense: buf = %i '%s'\n", len, buf);
+ #endif
+ }
+
+ // Send password
+ if( giDoor_ChildStatus || fputs(gsDoor_Password, child_stdin) <= 0 ) {
#if DEBUG
- printf("Door_DoDispense: llogin failure\n");
+ int child_exit;
+ waitpid(childPid, &child_exit, 0);
+ printf("Door_DoDispense: fputs password fail (child status %i)\n", child_exit);
#endif
return -1;
}
- if( fread(buf, 512, 1, pipe) == 0 ) return -1; // Flush!
+ fputs("\n", child_stdin);
- // Send password
- fputs(gsDoor_Password, pipe);
- fputs("\n", pipe);
- if( fread(buf, 512, 1, pipe) == 0 ) return -1; // Flush!
+
+ #if DEBUG
+ printf("Door_DoDispense: Door unlock\n");
+ #endif
// ATH1 - Unlock door
- fputs("ATH1\n", pipe);
- if( fread(buf, 512, 1, pipe) == 0 ) return -1; // Flush!
+ if( giDoor_ChildStatus || fputs("ATH1\n", child_stdin) <= 0) {
+ #if DEBUG
+ printf("Door_DoDispense: fputs unlock\n");
+ #endif
+ return -1;
+ }
// Wait before re-locking
sleep(DOOR_UNLOCKED_DELAY);
- // Re-lock the door
- fputs("ATH0\n", pipe);
- if( fread(buf, 512, 1, pipe) == 0 ) return -1; // Flush!
+
+ #if DEBUG
+ printf("Door_DoDispense: Door re-lock\n");
+ #endif
+
+ // Re-lock the door (and quit llogin)
+ if( giDoor_ChildStatus || fputs("ATH0\n\x1D", child_stdin) == 0 ) {
+ #if DEBUG
+ printf("Door_DoDispense: fputs lock\n");
+ #endif
+ return -1;
+ }
- pclose(pipe);
+ fclose(child_stdin);
+ close(stdin_pair[1]); // child stdin write
+ close(stdout_pair[0]); // child stdout read
#if DEBUG
printf("Door_DoDispense: User %i opened door\n", User);
#endif
+ kill(childPid, SIGKILL);
+
return 0;
}
-