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plugins.d/splashy.c
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#define _GNU_SOURCE             /* asprintf() */
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#include <signal.h>             /* sig_atomic_t, struct sigaction,
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                                   sigemptyset(), sigaddset(), SIGINT,
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                                   SIGHUP, SIGTERM, sigaction,
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                                   SIG_IGN, kill(), SIGKILL */
 
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                                   sigemptyset(), sigaddset(),
 
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                                   sigaction, SIGINT, SIG_IGN, SIGHUP,
 
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                                   SIGTERM, kill(), SIGKILL */
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#include <stddef.h>             /* NULL */
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#include <stdlib.h>             /* getenv() */
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#include <stdio.h>              /* asprintf(), perror() */
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#include <stdlib.h>             /* EXIT_FAILURE, free(), strtoul(),
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                                   EXIT_SUCCESS */
 
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#include <stdlib.h>             /* EXIT_FAILURE, EXIT_SUCCESS,
 
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                                   strtoul(), free() */
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#include <sys/types.h>          /* pid_t, DIR, struct dirent,
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                                   ssize_t */
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#include <dirent.h>             /* opendir(), readdir(), closedir() */
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#include <sys/stat.h>           /* struct stat, lstat(), S_ISLNK */
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#include <iso646.h>             /* not, or, and */
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#include <unistd.h>             /* readlink(), fork(), execl(),
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                                   sleep(), dup2() STDERR_FILENO,
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                                   STDOUT_FILENO, _exit() */
 
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                                   _exit */
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#include <string.h>             /* memcmp() */
 
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#include <iso646.h>             /* and */
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#include <errno.h>              /* errno */
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#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
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                                   WEXITSTATUS() */
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          closedir(proc_dir);
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          return EXIT_FAILURE;
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        }
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        /* Check that it refers to a symlink owned by root:root */
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        struct stat exe_stat;
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        ret = lstat(exe_link, &exe_stat);
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        if(ret == -1){
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          perror("lstat");
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          free(exe_link);
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          free(prompt);
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          closedir(proc_dir);
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          return EXIT_FAILURE;
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        }
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        if(not S_ISLNK(exe_stat.st_mode)
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           or exe_stat.st_uid != 0
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           or exe_stat.st_gid != 0){
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          free(exe_link);
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          continue;
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        }
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        sret = readlink(exe_link, exe_target, sizeof(exe_target));
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        free(exe_link);
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      }
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      free(prompt);
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      return EXIT_FAILURE;
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    }
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    if(old_action.sa_handler != SIG_IGN){
 
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    if (old_action.sa_handler != SIG_IGN){
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      ret = sigaction(SIGINT, &new_action, NULL);
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      if(ret == -1){
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        perror("sigaction");
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      free(prompt);
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      return EXIT_FAILURE;
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    }
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    if(old_action.sa_handler != SIG_IGN){
 
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    if (old_action.sa_handler != SIG_IGN){
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      ret = sigaction(SIGHUP, &new_action, NULL);
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      if(ret == -1){
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        perror("sigaction");
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      free(prompt);
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      return EXIT_FAILURE;
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    }
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    if(old_action.sa_handler != SIG_IGN){
 
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    if (old_action.sa_handler != SIG_IGN){
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      ret = sigaction(SIGTERM, &new_action, NULL);
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      if(ret == -1){
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        perror("sigaction");
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      const char splashy_command[] = "/sbin/splashy_update";
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      ret = execl(splashy_command, splashy_command, prompt,
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                  (char *)NULL);
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      if(not interrupted_by_signal){
 
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      if(not interrupted_by_signal and errno != ENOENT){
 
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        /* Don't report "File not found", since splashy might not be
 
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           installed. */
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        perror("execl");
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      }
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      free(prompt);
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      _exit(EXIT_FAILURE);
 
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      return EXIT_FAILURE;
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    }
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  }
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  free(prompt);
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  /* Wait for command to complete */
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  if(not interrupted_by_signal and splashy_command_pid != 0){
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    int status;
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    ret = waitpid(splashy_command_pid, &status, 0);
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    if(ret == -1){
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      if(errno != EINTR){
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        perror("waitpid");
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      }
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      if(errno == ECHILD){
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        splashy_command_pid = 0;
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      }
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    } else {
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      /* The child process has exited */
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      splashy_command_pid = 0;
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      if(not interrupted_by_signal and WIFEXITED(status)
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         and WEXITSTATUS(status)==0){
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        return EXIT_SUCCESS;
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      }
 
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  int status;
 
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  while(not interrupted_by_signal){
 
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    waitpid(splashy_command_pid, &status, 0);
 
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    if(not interrupted_by_signal
 
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       and WIFEXITED(status) and WEXITSTATUS(status)==0){
 
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      return EXIT_SUCCESS;
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    }
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  }
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  kill(splashy_pid, SIGTERM);
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  if(interrupted_by_signal and splashy_command_pid != 0){
 
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  if(interrupted_by_signal){
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    kill(splashy_command_pid, SIGTERM);
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  }
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  sleep(2);
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  while(kill(splashy_pid, 0) == 0){
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    kill(splashy_pid, SIGKILL);
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    sleep(1);
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  }
 
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  pid_t new_splashy_pid = fork();
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  if(new_splashy_pid == 0){
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    /* Child; will become new splashy process */
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    /* Make the effective user ID (root) the only user ID instead of
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       the real user ID (mandos) */
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    ret = setuid(geteuid());
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    if(ret == -1){
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      perror("setuid");
 
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    while(kill(splashy_pid, 0)){
 
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      sleep(2);
 
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      kill(splashy_pid, SIGKILL);
 
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      sleep(1);
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    }
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    setsid();
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    ret = chdir("/");
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/*     if(fork() != 0){ */
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/*       _exit(EXIT_SUCCESS); */
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/*     } */
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    ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
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    if(ret == -1){
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      perror("dup2");
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      _exit(EXIT_FAILURE);
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    }
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    execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
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    if(not interrupted_by_signal){
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      perror("execl");
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    }
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    _exit(EXIT_FAILURE);
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  }
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  return EXIT_FAILURE;