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Viewing changes to plugins.d/usplash.c

  • Committer: Teddy Hogeborn
  • Date: 2008-10-04 20:09:53 UTC
  • Revision ID: teddy@fukt.bsnet.se-20081004200953-7j0fjlq6fqsxs9t2
* Makefile (DOCS): Added "plugins.d/askpass-fifo.8mandos".
  (install-client-nokey): Also install
                          "plugins.d/askpass-fifo.8mandos".
  (uninstall-client): Also uninstall "plugins.d/askpass-fifo.8mandos".

* plugins.d/askpass-fifo.xml: New.

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plugins.d/usplash.c
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                                   SIG_IGN, kill(), SIGKILL */
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#include <stdbool.h>            /* bool, false, true */
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#include <fcntl.h>              /* open(), O_WRONLY, O_RDONLY */
 
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#include <iso646.h>             /* and, or, not*/
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#include <errno.h>              /* errno, EINTR */
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#include <sys/types.h>          /* size_t, ssize_t, pid_t, DIR,
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                                   struct dirent */
 
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#include <sys/types.h>          /* size_t, ssize_t, pid_t, DIR, struct
 
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                                   dirent */
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#include <stddef.h>             /* NULL */
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#include <string.h>             /* strlen(), memcmp() */
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#include <stdio.h>              /* asprintf(), perror() */
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                                   _exit() */
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#include <stdlib.h>             /* getenv() */
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#include <dirent.h>             /* opendir(), readdir(), closedir() */
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#include <iso646.h>             /* and */
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#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
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                                   WEXITSTATUS() */
 
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#include <sys/stat.h>           /* struct stat, lstat(), S_ISLNK */
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sig_atomic_t interrupted_by_signal = 0;
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static bool usplash_write(const char *cmd, const char *arg){
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  /* 
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   * usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
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   * usplash_write("PULSATE", NULL); -> "PULSATE\0"
 
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   * usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
 
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   * usplash_write("PULSATE", NULL) will write "PULSATE\0"
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   * SEE ALSO
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   *         usplash_write(8)
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   */
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         /proc/<pid>/exe link */
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      char exe_target[sizeof(usplash_name)];
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      {
 
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        /* create file name string */
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        char *exe_link;
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        ret = asprintf(&exe_link, "/proc/%s/exe", proc_ent->d_name);
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        if(ret == -1){
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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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        if(sret == -1){
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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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      return EXIT_SUCCESS;
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    }
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    break;                      /* Big */
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  }
 
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  }                             /* end of non-loop while() */
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  /* If we got here, an error or interrupt must have happened */
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  /* Create argc and argv for new usplash*/
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  int cmdline_argc = 0;
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  char **cmdline_argv = malloc(sizeof(char *));
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  /* Create argv and argc for new usplash*/
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  {
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    size_t position = 0;
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    while(position < cmdline_len){
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    cmdline_argv[cmdline_argc] = NULL;
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  }
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  /* Kill old usplash */
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    kill(usplash_pid, SIGTERM);
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    sleep(2);
 
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  kill(usplash_pid, SIGTERM);
 
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  sleep(2);
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  while(kill(usplash_pid, 0) == 0){
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    kill(usplash_pid, SIGKILL);
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    sleep(1);
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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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    if(ret == -1){
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      perror("setuid");
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    }
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    }
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    execv(usplash_name, cmdline_argv);
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    perror("execv");
 
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    if(not interrupted_by_signal){
 
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      perror("execv");
 
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    }
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    free(cmdline);
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    free(cmdline_argv);
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    _exit(EXIT_FAILURE);