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Viewing changes to plugins.d/usplash.c

  • Committer: Teddy Hogeborn
  • Date: 2009-01-15 02:52:02 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090115025202-utyjssfivzumvw7m
* debian/watch: New file.

* debian/mandos-client.README.Debian (Emergency Escape): New section;
                                                         document the
                                                         "mandos=off"
                                                         kernel
                                                         parameter.
* initramfs-tools-script: Exit if kernel has parameter "mandos=off".

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plugins.d/usplash.c
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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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#include <stdio.h>              /* asprintf(), perror(), sscanf() */
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#include <unistd.h>             /* close(), write(), readlink(),
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                                   read(), STDOUT_FILENO, sleep(),
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                                   fork(), setuid(), geteuid(),
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                                   setsid(), chdir(), dup2(),
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                                   STDERR_FILENO, execv() */
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#include <stdlib.h>             /* free(), EXIT_FAILURE, strtoul(),
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                                   realloc(), EXIT_SUCCESS, malloc(),
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                                   _exit() */
 
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#include <stdlib.h>             /* free(), EXIT_FAILURE, realloc(),
 
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                                   EXIT_SUCCESS, malloc(), _exit() */
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#include <stdlib.h>             /* getenv() */
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#include <dirent.h>             /* opendir(), readdir(), closedir() */
 
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#include <inttypes.h>           /* intmax_t, SCNdMAX */
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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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    for(struct dirent *proc_ent = readdir(proc_dir);
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        proc_ent != NULL;
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        proc_ent = readdir(proc_dir)){
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      pid_t pid = (pid_t) strtoul(proc_ent->d_name, NULL, 10);
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      if(pid == 0){
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        /* Not a process */
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        continue;
 
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      pid_t pid;
 
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      {
 
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        intmax_t tmpmax;
 
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        int numchars;
 
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        ret = sscanf(proc_ent->d_name, "%" SCNdMAX "%n", &tmpmax,
 
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                     &numchars);
 
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        if(ret < 1 or tmpmax != (pid_t)tmpmax
 
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           or proc_ent->d_name[numchars] != '\0'){
 
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          /* Not a process */
 
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          continue;
 
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        }
 
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        pid = (pid_t)tmpmax;
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      }
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      /* Find the executable name by doing readlink() on the
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         /proc/<pid>/exe link */
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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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          if(errno == ENOENT){
 
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            free(exe_link);
 
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            continue;
 
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          }
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          perror("lstat");
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          free(exe_link);
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          free(prompt);
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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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          continue;
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        }
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      }
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      if((sret == ((ssize_t)sizeof(exe_target)-1))
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         and (memcmp(usplash_name, exe_target,
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    /* Child; will become new usplash 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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       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");