static void ParseModbusArgs(modbus_config_t *config, char *args)
{
char *saveptr;
char *token;
/* Set default port */
config->ports[PORT_INDEX(MODBUS_PORT)] |= CONV_PORT(MODBUS_PORT);
/* No args? Stick to the default. */
if (args == NULL)
return;
token = strtok_r(args, " ", &saveptr);
while (token != NULL)
{
if (strcmp(token, "ports") == 0)
{
unsigned nPorts = 0;
/* Un-set the default port */
config->ports[PORT_INDEX(MODBUS_PORT)] = 0;
/* Parse ports */
token = strtok_r(NULL, " ", &saveptr);
if (token == NULL)
{
_dpd.fatalMsg("%s(%d) Missing argument for Modbus preprocessor "
"'ports' option.\n", *_dpd.config_file, *_dpd.config_line);
}
if (isdigit(token[0]))
{
ParseSinglePort(config, token);
nPorts++;
}
else if (*token == '{')
{
/* list of ports */
token = strtok_r(NULL, " ", &saveptr);
while (token != NULL && *token != '}')
{
ParseSinglePort(config, token);
nPorts++;
token = strtok_r(NULL, " ", &saveptr);
}
}
else
{
nPorts = 0;
}
if ( nPorts == 0 )
{
_dpd.fatalMsg("%s(%d) Bad Modbus 'ports' argument: '%s'\n"
"Argument to Modbus 'ports' must be an integer, or a list "
"enclosed in { } braces.\n", *_dpd.config_file, *_dpd.config_line, token);
}
}
else
{
_dpd.fatalMsg("%s(%d) Failed to parse modbus argument: %s\n",
*_dpd.config_file, *_dpd.config_line, token);
}
token = strtok_r(NULL, " ", &saveptr);
}
}
static void ParseDNP3Args(struct _SnortConfig *sc, dnp3_config_t *config, char *args)
{
char *saveptr;
char *token;
/* Set defaults */
config->memcap = DNP3_DEFAULT_MEMCAP;
config->ports[PORT_INDEX(DNP3_PORT)] |= CONV_PORT(DNP3_PORT);
config->check_crc = 0;
/* No arguments? Stick with defaults. */
if (args == NULL)
return;
token = strtok_r(args, " ,", &saveptr);
while (token != NULL)
{
if (strcmp(token, DNP3_PORTS_KEYWORD) == 0)
{
unsigned nPorts = 0;
/* Un-set the default port */
config->ports[PORT_INDEX(DNP3_PORT)] = 0;
/* Parse ports */
token = strtok_r(NULL, " ,", &saveptr);
if (token == NULL)
{
DynamicPreprocessorFatalMessage("%s(%d): Missing argument for "
"DNP3 preprocessor 'ports' option.\n",
*_dpd.config_file, *_dpd.config_line);
}
if (isdigit(token[0]))
{
ParseSinglePort(config, token);
nPorts++;
}
else if (*token == '{')
{
/* list of ports */
token = strtok_r(NULL, " ,", &saveptr);
while (token != NULL && *token != '}')
{
ParseSinglePort(config, token);
nPorts++;
token = strtok_r(NULL, " ,", &saveptr);
}
}
else
{
nPorts = 0;
}
if ( nPorts == 0 )
{
DynamicPreprocessorFatalMessage("%s(%d): Bad DNP3 'ports' argument: '%s'\n"
"Argument to DNP3 'ports' must be an integer, or a list "
"enclosed in { } braces.\n",
*_dpd.config_file, *_dpd.config_line, token);
}
}
else if (strcmp(token, DNP3_MEMCAP_KEYWORD) == 0)
{
uint32_t memcap;
char *endptr;
/* Parse memcap */
token = strtok_r(NULL, " ", &saveptr);
/* In a multiple policy scenario, the memcap from the default policy
overrides the memcap in any targeted policies. */
if (_dpd.getParserPolicy(sc) != _dpd.getDefaultPolicy())
{
dnp3_config_t *default_config =
(dnp3_config_t *)sfPolicyUserDataGet(dnp3_context_id,
_dpd.getDefaultPolicy());
if (!default_config || default_config->memcap == 0)
{
DynamicPreprocessorFatalMessage("%s(%d): DNP3 'memcap' must be "
"configured in the default config.\n",
*_dpd.config_file, *_dpd.config_line);
}
config->memcap = default_config->memcap;
}
else
{
if (token == NULL)
{
DynamicPreprocessorFatalMessage("%s(%d): Missing argument for DNP3 "
"preprocessor 'memcap' option.\n",
*_dpd.config_file, *_dpd.config_line);
}
memcap = _dpd.SnortStrtoul(token, &endptr, 10);
if ((token[0] == '-') || (*endptr != '\0') ||
(memcap < MIN_DNP3_MEMCAP) || (memcap > MAX_DNP3_MEMCAP))
{
DynamicPreprocessorFatalMessage("%s(%d): Bad DNP3 'memcap' argument: %s\n"
"Argument to DNP3 'memcap' must be an integer between "
"%d and %d.\n", *_dpd.config_file, *_dpd.config_line,
token, MIN_DNP3_MEMCAP, MAX_DNP3_MEMCAP);
}
config->memcap = memcap;
}
}
else if (strcmp(token, DNP3_CHECK_CRC_KEYWORD) == 0)
{
/* Parse check_crc */
config->check_crc = 1;
}
else if (strcmp(token, DNP3_DISABLED_KEYWORD) == 0)
{
/* TODO: if disabled, check that no other stuff is turned on except memcap */
config->disabled = 1;
}
else
{
DynamicPreprocessorFatalMessage("%s(%d): Failed to parse dnp3 argument: "
"%s\n", *_dpd.config_file, *_dpd.config_line, token);
}
token = strtok_r(NULL, " ,", &saveptr);
}
}
