sighand.c File Reference

Provides signal handling functions. More...

#include "sighand.h"
#include "debug_utils.h"
#include "processes.h"
#include <execinfo.h>
#include <glib.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>

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Macros
#define	G_LOG_DOMAIN   "sd main"
	GLib log domain. More...

Functions
void	let_em_die (int pid)
void	make_em_die (int sig)
void	sighand_chld (int sig)
static void	print_trace (void)
void	sighand_segv (int given_signal)

Variables
void(*)(int)	openvas_signal (int signum, void(*handler)(int))

Detailed Description

Provides signal handling functions.

Definition in file sighand.c.

Macro Definition Documentation

G_LOG_DOMAIN

#define G_LOG_DOMAIN   "sd main"

GLib log domain.

Definition at line 28 of file sighand.c.

Function Documentation

let_em_die()

void let_em_die

(

int

pid

)

Definition at line 32 of file sighand.c.

{
  int status;
 
  waitpid (pid, &status, WNOHANG);
}

References pid.

Referenced by make_em_die().

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make_em_die()

void make_em_die

(

int

sig

)

Definition at line 40 of file sighand.c.

{
  /* number of times, the sig is sent at most */
  int n = 3;
 
  /* leave if we are session leader */
  if (getpgrp () != getpid ())
    return;
 
  /* quickly send signals and check the result */
  if (kill (0, sig) < 0)
    return;
  let_em_die (0);
  if (kill (0, 0) < 0)
    return;
 
  do
    {
      /* send the signal to everybody in the group */
      if (kill (0, sig) < 0)
        return;
      sleep (1);
      /* do not leave a zombie, hanging around if possible */
      let_em_die (0);
    }
  while (--n > 0);
 
  if (kill (0, 0) < 0)
    return;
 
  kill (0, SIGKILL);
  sleep (1);
  let_em_die (0);
}

References let_em_die().

Referenced by init_child_signal_handlers(), and sighand_segv().

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print_trace()

static void print_trace ( void  )

static

Definition at line 104 of file sighand.c.

{
  void *array[10];
  int ret = 0, left;
  char *message = "SIGSEGV occurred!\n";
  char **strings;
 
  /*It used log_get_fd() in log.h to know where to log the backtrace.*/
  ret = backtrace (array, 10);
  strings = backtrace_symbols (array, ret);
  g_warning ("%s", message);
 
  for (left = 0; left < ret; left++)
    g_warning ("%s\n", strings[left]);
 
  g_free (strings);
}

Referenced by sighand_segv().

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sighand_chld()

void sighand_chld

(

int

sig

)

Definition at line 95 of file sighand.c.

{
  (void) sig;
  // if we call multiple times waitpid it will disturb the attack loop.
  // therefore we cannot cleanup multiple ipc here
  waitpid (-1, NULL, WNOHANG);
}

Referenced by init_signal_handlers().

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sighand_segv()

void sighand_segv

(

int

given_signal

)

Definition at line 123 of file sighand.c.

{
  print_trace ();
  make_em_die (SIGTERM);
  gvm_close_sentry ();
  /* Raise signal again, to exit with the correct return value,
   * and to enable core dumping. */
  openvas_signal (given_signal, SIG_DFL);
  raise (given_signal);
}

References make_em_die(), openvas_signal, and print_trace().

Referenced by init_child_signal_handlers().

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Variable Documentation

openvas_signal

void(*)(int) openvas_signal(int signum, void(*handler)(int))

Definition at line 79 of file sighand.c.

{
  struct sigaction saNew, saOld;
 
  /* Init new handler */
  sigfillset (&saNew.sa_mask);
  sigdelset (&saNew.sa_mask, SIGALRM); /* make sleep() work */
 
  saNew.sa_flags = 0;
  saNew.sa_handler = handler;
 
  sigaction (signum, &saNew, &saOld);
  return saOld.sa_handler;
}

Referenced by attack_network(), init_child_signal_handlers(), init_signal_handlers(), plugins_reload_from_dir(), and sighand_segv().