nvticache.c

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/* SPDX-FileCopyrightText: 2009-2023 Greenbone AG
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

 
#include "nvticache.h"
 
#include "kb.h" /* for kb_del_items, kb_item_get_str, kb_item_add_int */
 
#include <assert.h> /* for assert */
#include <errno.h>
#include <stdio.h>    /* for fopen */
#include <stdlib.h>   /* for atoi */
#include <string.h>   /* for strcmp */
#include <sys/stat.h> /* for stat, st_mtime */
#include <time.h>     /* for time, time_t */
 
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "libgvm util"
 
char *src_path = NULL; 
kb_t cache_kb = NULL;  
int cache_saved = 1;   

int
nvticache_initialized (void)
{
  return !!cache_kb;
}

int
nvticache_init (const char *src, const char *kb_path)
{
  assert (src);
 
  if (src_path)
    g_free (src_path);
  src_path = g_strdup (src);
  if (cache_kb)
    kb_lnk_reset (cache_kb);
  cache_kb = kb_find (kb_path, NVTICACHE_STR);
  if (cache_kb)
    return 0;
 
  if (kb_new (&cache_kb, kb_path)
      || kb_item_set_str (cache_kb, NVTICACHE_STR, "0", 0))
    return -1;
  return 0;
}

kb_t
nvticache_get_kb (void)
{
  assert (cache_kb);
  return cache_kb;
}

int
nvticache_check (const gchar *filename)
{
  assert (cache_kb);
  char *src_file, *time_s;
  struct stat src_stat;
  int ret = 0;
 
  src_file = g_build_filename (src_path, filename, NULL);
  time_s = kb_nvt_get (cache_kb, filename, NVT_TIMESTAMP_POS);
  if (time_s && src_file && stat (src_file, &src_stat) >= 0
      && atoi (time_s) > src_stat.st_mtime)
    ret = 1;
  g_free (time_s);
  g_free (src_file);
  return ret;
}

void
nvticache_reset (void)
{
  if (cache_kb)
    kb_lnk_reset (cache_kb);
}

static char *
nvt_feed_version ()
{
  char filename[2048], *fcontent = NULL, *plugin_set;
  GError *error = NULL;
  static int msg_shown = 0;
 
  g_snprintf (filename, sizeof (filename), "%s/plugin_feed_info.inc", src_path);
  if (!g_file_get_contents (filename, &fcontent, NULL, &error))
    {
      if (error && msg_shown == 0)
        {
          g_warning ("nvt_feed_version: %s", error->message);
          msg_shown = 1;
        }
      g_error_free (error);
      return NULL;
    }
  plugin_set = g_strrstr (fcontent, "PLUGIN_SET = ");
  if (!plugin_set)
    {
      g_warning ("nvt_feed_version: Erroneous %s format", filename);
      g_free (fcontent);
      return NULL;
    }
  msg_shown = 0;
  plugin_set = g_strndup (plugin_set + 14, 12);
  if (g_strstr_len (plugin_set, -1, "\"") || g_strstr_len (plugin_set, -1, ";"))
    {
      g_warning ("nvt_feed_version: Erroneous %s format. Format of PLUGIN_SET "
                 "has to be yyyymmddhhmm. It has to be exactly 12 chars long.",
                 filename);
      g_free (plugin_set);
      g_free (fcontent);
      return NULL;
    }
 
  g_free (fcontent);
  return plugin_set;
}

void
nvticache_save (void)
{
  char *feed_version, *old_version;
 
  old_version = nvticache_feed_version ();
  feed_version = nvt_feed_version ();
  if (feed_version && g_strcmp0 (old_version, feed_version))
    {
      kb_item_set_str (cache_kb, NVTICACHE_STR, feed_version, 0);
      g_message ("Updated NVT cache from version %s to %s", old_version,
                 feed_version);
    }
  g_free (old_version);
  g_free (feed_version);
}

int
nvticache_add (const nvti_t *nvti, const char *filename)
{
  char *oid, *dummy;
 
  assert (cache_kb);
  /* Check for duplicate OID. */
  oid = nvti_oid (nvti);
  dummy = nvticache_get_filename (oid);
  if (dummy && strcmp (filename, dummy))
    {
      struct stat src_stat;
      char *src_file = g_build_filename (src_path, dummy, NULL);
 
      /* If .nasl file was duplicated, not moved. */
      if (src_file && stat (src_file, &src_stat) >= 0)
        g_warning ("NVT %s with duplicate OID %s will be replaced with %s",
                   src_file, oid, filename);
      g_free (src_file);
    }
  if (dummy)
    nvticache_delete (oid);
 
  g_free (dummy);
 
  if (kb_nvt_add (cache_kb, nvti, filename))
    goto kb_fail;
  cache_saved = 0;
 
  return 0;
kb_fail:
  return -1;
}

char *
nvticache_get_src (const char *oid)
{
  char *filename, *src;
 
  assert (cache_kb);
 
  filename = kb_nvt_get (cache_kb, oid, NVT_FILENAME_POS);
  if (!filename)
    return NULL;
  src = g_build_filename (src_path, filename, NULL);
  g_free (filename);
  return src;
}

char *
nvticache_get_oid (const char *filename)
{
  assert (cache_kb);
 
  return kb_nvt_get (cache_kb, filename, NVT_OID_POS);
}

char *
nvticache_get_filename (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_FILENAME_POS);
}

char *
nvticache_get_required_keys (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_REQUIRED_KEYS_POS);
}

char *
nvticache_get_mandatory_keys (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_MANDATORY_KEYS_POS);
}

char *
nvticache_get_excluded_keys (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_EXCLUDED_KEYS_POS);
}

char *
nvticache_get_required_udp_ports (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_REQUIRED_UDP_PORTS_POS);
}

char *
nvticache_get_required_ports (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_REQUIRED_PORTS_POS);
}

char *
nvticache_get_dependencies (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_DEPENDENCIES_POS);
}

int
nvticache_get_category (const char *oid)
{
  int category;
  char *category_s;
 
  assert (cache_kb);
  category_s = kb_nvt_get (cache_kb, oid, NVT_CATEGORY_POS);
  category = atoi (category_s);
  g_free (category_s);
  return category;
}

char *
nvticache_get_name (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_NAME_POS);
}

char *
nvticache_get_cves (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_CVES_POS);
}

char *
nvticache_get_bids (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_BIDS_POS);
}

char *
nvticache_get_xrefs (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_XREFS_POS);
}

char *
nvticache_get_family (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_FAMILY_POS);
}

char *
nvticache_get_tags (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get (cache_kb, oid, NVT_TAGS_POS);
}

nvti_t *
nvticache_get_nvt (const char *oid)
{
  assert (cache_kb);
  return kb_nvt_get_all (cache_kb, oid);
}

GSList *
nvticache_get_prefs (const char *oid)
{
  char pattern[4096];
  struct kb_item *prefs, *element;
  GSList *list = NULL;
 
  assert (cache_kb);
 
  g_snprintf (pattern, sizeof (pattern), "oid:%s:prefs", oid);
  prefs = element = kb_item_get_all (cache_kb, pattern);
  while (element)
    {
      nvtpref_t *np;
      char **array = g_strsplit (element->v_str, "|||", -1);
 
      assert (array[3]);
      assert (!array[4]);
      np = nvtpref_new (atoi (array[0]), array[1], array[2], array[3]);
      g_strfreev (array);
      list = g_slist_append (list, np);
      element = element->next;
    }
  kb_item_free (prefs);
 
  return list;
}

GSList *
nvticache_get_oids ()
{
  assert (cache_kb);
 
  return kb_nvt_get_oids (cache_kb);
}

size_t
nvticache_count ()
{
  assert (cache_kb);
 
  return kb_item_count (cache_kb, "nvt:*");
}

void
nvticache_delete (const char *oid)
{
  char pattern[4096];
  char *filename;
 
  assert (cache_kb);
  assert (oid);
 
  filename = nvticache_get_filename (oid);
  g_snprintf (pattern, sizeof (pattern), "oid:%s:prefs", oid);
  kb_del_items (cache_kb, pattern);
  g_snprintf (pattern, sizeof (pattern), "nvt:%s", oid);
  kb_del_items (cache_kb, pattern);
 
  if (filename)
    {
      g_snprintf (pattern, sizeof (pattern), "filename:%s", filename);
      kb_del_items (cache_kb, pattern);
    }
  g_free (filename);
}

char *
nvticache_feed_version (void)
{
  return kb_item_get_str (cache_kb, NVTICACHE_STR);
}

int
nvticache_check_feed (void)
{
  char *cached, *current;
  int ret;
 
  if (!(current = nvt_feed_version ()))
    return 0;
  cached = kb_item_get_str (cache_kb, NVTICACHE_STR);
  ret = strcmp (cached, current);
  g_free (cached);
  g_free (current);
  return ret;
}