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/*
* Copyright (c) 2002-2012 Balabit
* Copyright (c) 1998-2012 Balázs Scheidler
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "gsocket.h"
#include "host-resolve.h"
#include "cfg-parser.h"
static void
tf_ipv4_to_int(LogMessage *msg, gint argc, GString *argv[], GString *result, LogMessageValueType *type)
{
gint i;
*type = LM_VT_STRING;
for (i = 0; i < argc; i++)
{
struct in_addr ina;
g_inet_aton(argv[i]->str, &ina);
g_string_append_printf(result, "%lu", (gulong) ntohl(ina.s_addr));
if (i < argc - 1)
g_string_append_c(result, ',');
}
}
TEMPLATE_FUNCTION_SIMPLE(tf_ipv4_to_int);
typedef struct _DnsResolveIpState
{
TFSimpleFuncState super;
HostResolveOptions host_resolve_options;
} DnsResolveIpState;
static gboolean
_process_use_fqdn(const gchar *option_name, const gchar *value, gpointer data, GError **error)
{
HostResolveOptions *host_resolve_options = (HostResolveOptions *)data;
host_resolve_options->use_fqdn = cfg_process_yesno(value);
return TRUE;
}
static gboolean
_process_use_dns(const gchar *option_name, const gchar *value, gpointer data, GError **error)
{
HostResolveOptions *host_resolve_options = (HostResolveOptions *)data;
host_resolve_options->use_dns = cfg_process_yesno(value);
return TRUE;
}
static gboolean
_process_dns_cache(const gchar *option_name, const gchar *value, gpointer data, GError **error)
{
HostResolveOptions *host_resolve_options = (HostResolveOptions *)data;
host_resolve_options->use_dns_cache = cfg_process_yesno(value);
return TRUE;
}
static gboolean
_process_normalize_hostnames(const gchar *option_name, const gchar *value, gpointer data, GError **error)
{
HostResolveOptions *host_resolve_options = (HostResolveOptions *)data;
host_resolve_options->normalize_hostnames = cfg_process_yesno(value);
return TRUE;
}
static gboolean
_parse_host_resolve_options(gint *argc, gchar **argv[], HostResolveOptions *host_resolve_options, GError **error)
{
gboolean result = FALSE;
GOptionEntry entries[] =
{
{ "use-fqdn", 'f', 0, G_OPTION_ARG_CALLBACK, _process_use_fqdn, NULL, NULL },
{ "use-dns", 'd', 0, G_OPTION_ARG_CALLBACK, _process_use_dns, NULL, NULL },
{ "dns-cache", 'c', 0, G_OPTION_ARG_CALLBACK, _process_dns_cache, NULL, NULL },
{ "normalize-hostnames", 'n', 0, G_OPTION_ARG_CALLBACK, _process_normalize_hostnames, NULL, NULL },
{ NULL }
};
GOptionContext *ctx = g_option_context_new(*argv[0]);
GOptionGroup *group = g_option_group_new("host-resolve-options", NULL, NULL, host_resolve_options, NULL);
g_option_group_add_entries(group, entries);
g_option_context_set_main_group(ctx, group);
if (!g_option_context_parse(ctx, argc, argv, error))
goto exit;
result = TRUE;
exit:
g_option_context_free(ctx);
return result;
}
static gboolean
_setup_host_resolve_options(DnsResolveIpState *state, LogTemplate *parent, gint *argc, gchar **argv[], GError **error)
{
host_resolve_options_defaults(&state->host_resolve_options);
if (!_parse_host_resolve_options(argc, argv, &state->host_resolve_options, error))
return FALSE;
host_resolve_options_init(&state->host_resolve_options, &parent->cfg->host_resolve_options);
return TRUE;
}
static gboolean
tf_dns_resolve_ip_prepare(LogTemplateFunction *self, gpointer s, LogTemplate *parent, gint argc, gchar *argv[],
GError **error)
{
DnsResolveIpState *state = (DnsResolveIpState *)s;
if (!_setup_host_resolve_options(state, parent, &argc, &argv, error))
return FALSE;
if (argc > 2)
{
g_set_error(error, LOG_TEMPLATE_ERROR, 0,
"dns-resolve-ip: too many arguments provided. usage: $(dns-resolve-ip [OPTIONS] IP)");
return FALSE;
}
if (!tf_simple_func_prepare(self, s, parent, argc, argv, error))
return FALSE;
return TRUE;
}
static void
tf_dns_resolve_ip_call(LogTemplateFunction *self, gpointer s, const LogTemplateInvokeArgs *args, GString *result,
LogMessageValueType *type)
{
DnsResolveIpState *state = (DnsResolveIpState *)s;
const gchar *hostname;
gsize result_len;
*type = LM_VT_STRING;
gchar *ip = args->argv[0]->str;
GSockAddr *addr = g_sockaddr_inet_or_inet6_new(ip, 0);
if (!addr)
return;
hostname = resolve_sockaddr_to_hostname(&result_len, addr, &state->host_resolve_options);
g_string_append_len(result, hostname, result_len);
g_sockaddr_unref(addr);
}
TEMPLATE_FUNCTION(DnsResolveIpState, tf_dns_resolve_ip, tf_dns_resolve_ip_prepare, tf_simple_func_eval,
tf_dns_resolve_ip_call, tf_simple_func_free_state, NULL);
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