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/*
* Copyright (c) 2015 Balabit
*
* 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 "filter/filter-expr.h"
#include "filter/filter-expr-parser.h"
#include "cfg.h"
#include "value-pairs/value-pairs.h"
#include "value-pairs/cmdline.h"
#include "syslog-ng.h"
#include "str-utils.h"
#include "format-cef-extension.h"
typedef struct _TFCefState
{
TFSimpleFuncState super;
ValuePairs *vp;
} TFCefState;
static gboolean
tf_cef_prepare(LogTemplateFunction *self, gpointer s, LogTemplate *parent,
gint argc, gchar *argv[],
GError **error)
{
TFCefState *state = (TFCefState *)s;
state->vp = value_pairs_new_from_cmdline(parent->cfg, &argc, &argv, NULL, NULL, error);
if (!state->vp)
return FALSE;
return TRUE;
}
typedef struct
{
gboolean need_separator;
GString *buffer;
const LogTemplateOptions *template_options;
} CefWalkerState;
static gboolean
tf_cef_is_valid_key(const gchar *str)
{
size_t end = strspn(str, "0123456789"
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ");
return str[end] == '\0';
}
static inline void
tf_cef_append_escaped(GString *escaped_string, const gchar *str, gsize str_len)
{
const gchar *char_ptr;
gunichar uchar;
while (str_len)
{
uchar = g_utf8_get_char_validated(str, str_len);
switch (uchar)
{
case (gunichar) -1:
case (gunichar) -2:
g_string_append_printf(escaped_string, "\\x%02x", *(guint8 *) str++);
str_len--;
continue;
break;
case '=':
g_string_append(escaped_string, "\\=");
break;
case '\n':
g_string_append(escaped_string, "\\n");
break;
case '\r':
g_string_append(escaped_string, "\\r");
break;
case '\\':
g_string_append(escaped_string, "\\\\");
break;
default:
if (uchar < 32)
g_string_append_printf(escaped_string, "\\u%04x", uchar);
else
g_string_append_unichar_optimized(escaped_string, uchar);
break;
}
char_ptr = g_utf8_next_char(str);
str_len -= char_ptr - str;
str = char_ptr;
}
}
static gboolean
tf_cef_append_value(const gchar *name, const gchar *value, gsize value_len,
CefWalkerState *state)
{
if (state->need_separator)
g_string_append_c(state->buffer, ' ');
g_string_append(state->buffer, name);
g_string_append_c(state->buffer, '=');
tf_cef_append_escaped(state->buffer, value, value_len);
return TRUE;
}
static gint
tf_cef_walk_cmp(const gchar *s1, const gchar *s2)
{
return strcmp(s1, s2);
}
static gboolean
tf_cef_walker(const gchar *name, LogMessageValueType type, const gchar *value, gsize value_len,
gpointer user_data)
{
CefWalkerState *state = (CefWalkerState *)user_data;
gint on_error = state->template_options->on_error;
if (!tf_cef_is_valid_key(name))
{
if (!(on_error & ON_ERROR_SILENT))
{
msg_error("Invalid CEF key",
evt_tag_str("key", name));
}
return !!(on_error & ON_ERROR_DROP_MESSAGE);
}
tf_cef_append_value(name, value, value_len, state);
state->need_separator = TRUE;
return FALSE;
}
static gboolean
tf_cef_append(GString *result, ValuePairs *vp, LogMessage *msg, LogTemplateEvalOptions *options)
{
CefWalkerState state;
state.need_separator = FALSE;
state.buffer = result;
state.template_options = options->opts;
return value_pairs_foreach_sorted(vp, tf_cef_walker,
(GCompareFunc) tf_cef_walk_cmp, msg,
options, &state);
}
static void
tf_cef_call(LogTemplateFunction *self, gpointer s,
const LogTemplateInvokeArgs *args, GString *result, LogMessageValueType *type)
{
TFCefState *state = (TFCefState *)s;
gint i;
gboolean r = TRUE;
gsize orig_size = result->len;
*type = LM_VT_STRING;
for (i = 0; i < args->num_messages; i++)
r &= tf_cef_append(result, state->vp, args->messages[i], args->options);
if (!r && (args->options->opts->on_error & ON_ERROR_DROP_MESSAGE))
g_string_set_size(result, orig_size);
}
static void
tf_cef_free_state(gpointer s)
{
TFCefState *state = (TFCefState *)s;
if (state->vp)
value_pairs_unref(state->vp);
tf_simple_func_free_state(&state->super);
}
TEMPLATE_FUNCTION(TFCefState, tf_cef, tf_cef_prepare, NULL, tf_cef_call,
tf_cef_free_state, NULL);
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