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/*
* Copyright (c) 2002-2011 Balabit
* Copyright (c) 1998-2011 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 "confgen.h"
#include "cfg.h"
#include "cfg-block-generator.h"
#include "messages.h"
#include "plugin.h"
#include <string.h>
#include <errno.h>
#include <stdlib.h>
static void
confgen_set_args_as_env(gpointer k, gpointer v, gpointer user_data)
{
if (!v)
{
msg_debug("confgen: Skipping empty argument",
evt_tag_str("name", (gchar *) k));
return;
}
gchar buf[1024];
g_snprintf(buf, sizeof(buf), "confgen_%s", (gchar *)k);
msg_debug("confgen: Passing argument to confgen script",
evt_tag_str("name", (gchar *) k),
evt_tag_str("value", (gchar *) v),
evt_tag_str("env_name", buf));
setenv(buf, (gchar *)v, 1);
}
static void
confgen_unset_args_from_env(gpointer k, gpointer v, gpointer user_data)
{
gchar buf[1024];
g_snprintf(buf, sizeof(buf), "confgen_%s", (gchar *)k);
unsetenv(buf);
}
typedef struct _ConfgenExec
{
CfgBlockGenerator super;
gchar *exec;
} ConfgenExec;
static void
_read_program_output(FILE *out, GString *result)
{
gchar buf[1024];
gsize res;
while ((res = fread(buf, 1, sizeof(buf), out)) > 0)
{
g_string_append_len(result, buf, res);
}
}
gboolean
confgen_exec_generate(CfgBlockGenerator *s, GlobalConfig *cfg, gpointer args, GString *result, const gchar *reference)
{
ConfgenExec *self = (ConfgenExec *) s;
FILE *out;
gchar buf[256];
gint res;
CfgArgs *cfgargs = (CfgArgs *)args;
g_snprintf(buf, sizeof(buf), "%s confgen %s", cfg_lexer_lookup_context_name_by_type(self->super.context),
self->super.name);
cfg_args_foreach(cfgargs, confgen_set_args_as_env, NULL);
out = popen(self->exec, "r");
cfg_args_foreach(cfgargs, confgen_unset_args_from_env, NULL);
if (!out)
{
msg_error("confgen: Error executing generator program",
evt_tag_str("reference", reference),
evt_tag_str("context", cfg_lexer_lookup_context_name_by_type(self->super.context)),
evt_tag_str("block", self->super.name),
evt_tag_str("exec", self->exec),
evt_tag_error("error"));
return FALSE;
}
_read_program_output(out, result);
res = pclose(out);
if (res != 0)
{
msg_error("confgen: Generator program returned with non-zero exit code",
evt_tag_str("reference", reference),
evt_tag_str("context", cfg_lexer_lookup_context_name_by_type(self->super.context)),
evt_tag_str("block", self->super.name),
evt_tag_str("exec", self->exec),
evt_tag_int("rc", res));
return FALSE;
}
msg_debug("confgen: output from the executed program to be included is",
evt_tag_mem("block", result->str, result->len));
return TRUE;
}
static void
confgen_exec_free(CfgBlockGenerator *s)
{
ConfgenExec *self = (ConfgenExec *) s;
g_free(self->exec);
cfg_block_generator_free_instance(s);
}
static CfgBlockGenerator *
confgen_exec_new(gint context, const gchar *name, const gchar *exec)
{
ConfgenExec *self = g_new0(ConfgenExec, 1);
cfg_block_generator_init_instance(&self->super, context, name);
self->super.generate = confgen_exec_generate;
self->super.free_fn = confgen_exec_free;
self->exec = g_strdup(exec);
return &self->super;
}
gboolean
confgen_module_init(PluginContext *plugin_context, CfgArgs *args)
{
const gchar *name, *context, *exec;
gint context_value;
if (!args)
{
msg_error("confgen: no arguments");
return FALSE;
}
name = cfg_args_get(args, "name");
if (!name)
{
msg_error("confgen: name argument expected");
return FALSE;
}
context = cfg_args_get(args, "context");
if (!context)
{
msg_error("confgen: context argument expected");
return FALSE;
}
context_value = cfg_lexer_lookup_context_type_by_name(context);
if (context_value == 0)
{
msg_error("confgen: context value is unknown",
evt_tag_str("context", context));
return FALSE;
}
exec = cfg_args_get(args, "exec");
if (!exec)
{
msg_error("confgen: exec argument expected");
return FALSE;
}
cfg_lexer_register_generator_plugin(plugin_context,
confgen_exec_new(context_value, name, exec));
return TRUE;
}
const ModuleInfo module_info =
{
.canonical_name = "confgen",
.version = SYSLOG_NG_VERSION,
.description = "The confgen module provides support for dynamically generated configuration file snippets for syslog-ng, used for the SCL system() driver for example",
.core_revision = SYSLOG_NG_SOURCE_REVISION,
.plugins = NULL,
.plugins_len = 0,
};
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