int parseConfigFile(int *insert_forward_rules, int *debug_mode, char iptables_location[],
char forward_chain_name[], char prerouting_chain_name[],
char upstream_bitrate[], char downstream_bitrate[],
char desc_doc[], char xml_path[])
{
FILE *conf_file;
regmatch_t submatch[2]; // Stores the regex submatch start end end index
regex_t re_comment;
regex_t re_empty_row;
regex_t re_iptables_location;
regex_t re_debug_mode;
regex_t re_insert_forward_rules_yes;
regex_t re_forward_chain_name;
regex_t re_prerouting_chain_name;
regex_t re_upstream_bitrate;
regex_t re_downstream_bitrate;
regex_t re_desc_doc;
regex_t re_xml_path;
// Make sure all vars are 0 or \0 terminated
*debug_mode = 0;
*insert_forward_rules = 0;
strcpy(iptables_location,"");
strcpy(forward_chain_name,"");
strcpy(prerouting_chain_name,"");
strcpy(upstream_bitrate,"");
strcpy(downstream_bitrate,"");
strcpy(desc_doc,"");
strcpy(xml_path,"");
// Regexp to match a comment line
regcomp(&re_comment,"^[[:blank:]]*#",0);
regcomp(&re_empty_row,"^[[:blank:]]*\r?\n$",REG_EXTENDED);
regcomp(&re_iptables_location,"iptables_location[[:blank:]]*=[[:blank:]]*([[:alpha:]/_]+)",REG_EXTENDED);
// Regexps to match debug_mode, insert_forward_rules, forward_chain_name
regcomp(&re_debug_mode,"debug_mode[[:blank:]]*=[[:blank:]]*([[:digit:]])",REG_EXTENDED);
regcomp(&re_insert_forward_rules_yes,"insert_forward_rules[[:blank:]]*=[[:blank:]]*yes",REG_ICASE);
regcomp(&re_forward_chain_name,"forward_chain_name[[:blank:]]*=[[:blank:]]*([[:alpha:]_-]+)",REG_EXTENDED);
regcomp(&re_prerouting_chain_name,"prerouting_chain_name[[:blank:]]*=[[:blank:]]([[:alpha:]_-]+)",REG_EXTENDED);
regcomp(&re_upstream_bitrate,"upstream_bitrate[[:blank:]]*=[[:blank:]]*([[:digit:]]+)",REG_EXTENDED);
regcomp(&re_downstream_bitrate,"downstream_bitrate[[:blank:]]*=[[:blank:]]*([[:digit:]]+)",REG_EXTENDED);
regcomp(&re_desc_doc,"description_document_name[[:blank:]]*=[[:blank:]]*([[:alpha:].]{1,20})",REG_EXTENDED);
regcomp(&re_xml_path,"xml_document_path[[:blank:]]*=[[:blank:]]*([[:alpha:]_/.]{1,50})",REG_EXTENDED);
if ((conf_file=fopen(CONF_FILE,"r")) != NULL)
{
char line[MAX_CONFIG_LINE];
// Walk through the config file line by line
while(fgets(line,MAX_CONFIG_LINE,conf_file) != NULL)
{
// Check if a comment line or an empty one
if ( (0 != regexec(&re_comment,line,0,NULL,0) ) &&
(0 != regexec(&re_empty_row,line,0,NULL,0)) )
{
// Chec if iptables_location
if (0 == regexec(&re_iptables_location,line,2,submatch,0))
{
getConfigOptionArgument(iptables_location,line,submatch);
}
// Check is insert_forward_rules
else if (0 == regexec(&re_insert_forward_rules_yes,line,0,NULL,0))
{
*insert_forward_rules = 1;
}
// Check forward_chain_name
else if (0 == regexec(&re_forward_chain_name,line,2,submatch,0))
{
getConfigOptionArgument(forward_chain_name,line,submatch);
}
else if (0 == regexec(&re_debug_mode,line,2,submatch,0) )
{
char tmp[2];
sprintf(tmp,"0");
strncpy(tmp,&line[submatch[1].rm_so],1);
*debug_mode = atoi(tmp);
}
else if (0 == regexec(&re_prerouting_chain_name,line,2,submatch,0))
{
getConfigOptionArgument(prerouting_chain_name,line,submatch);
}
else if (0 == regexec(&re_upstream_bitrate,line,2,submatch,0))
{
getConfigOptionArgument(upstream_bitrate,line,submatch);
}
else if (0 == regexec(&re_downstream_bitrate,line,2,submatch,0))
{
getConfigOptionArgument(downstream_bitrate,line,submatch);
}
else if (0 == regexec(&re_desc_doc,line,2,submatch,0))
{
getConfigOptionArgument(desc_doc,line,submatch);
}
else if (0 == regexec(&re_xml_path,line,2,submatch,0))
{
getConfigOptionArgument(xml_path,line,submatch);
}
else
{
// We end up here if ther is an unknown config directive
printf("Unknown config line:%s",line);
}
}
}
fclose(conf_file);
}
regfree(&re_comment);
regfree(&re_empty_row);
regfree(&re_debug_mode);
regfree(&re_insert_forward_rules_yes);
regfree(&re_forward_chain_name);
regfree(&re_prerouting_chain_name);
regfree(&re_upstream_bitrate);
regfree(&re_downstream_bitrate);
regfree(&re_desc_doc);
regfree(&re_xml_path);
// Set default values for options not found in config file
if (0 == strlen(forward_chain_name))
{
// No forward chain name was set in conf file, set it to default
sprintf(forward_chain_name,IPTABLES_DEFAULT_FORWARD_CHAIN);
}
if (0 == strlen(prerouting_chain_name))
{
// No prerouting chain name was set in conf file, set it to default
sprintf(prerouting_chain_name,IPTABLES_DEFAULT_PREROUTING_CHAIN);
}
if (0 == strlen(upstream_bitrate))
{
// No upstream_bitrate was found in the conf file, set it to default
sprintf(upstream_bitrate,IPTABLES_DEFAULT_UPSTREAM_BITRATE);
}
if (0 == strlen(downstream_bitrate))
{
// No downstream bitrate was found in the conf file, set it to default
sprintf(downstream_bitrate,IPTABLES_DEFAULT_DOWNSTREAM_BITRATE);
}
if (0 == strlen(desc_doc))
{
sprintf(desc_doc,DESC_DOC_DEFAULT);
}
if (0 == strlen(xml_path))
{
sprintf(xml_path,XML_PATH_DEFAULT);
}
if (0 == strlen(iptables_location)) {
// Can't find the iptables executable, return -1 to
// indicate en error
return -1;
}
else
{
return 0;
}
}
int parseConfigFile(globals_p vars)
{
FILE *conf_file;
regmatch_t submatch[NMATCH]; // Stores the regex submatch start and end index
regex_t re_comment;
regex_t re_empty_row;
regex_t re_iptables_location;
regex_t re_debug_mode;
regex_t re_insert_forward_rules_yes;
regex_t re_forward_chain_name;
regex_t re_prerouting_chain_name;
regex_t re_upstream_bitrate;
regex_t re_downstream_bitrate;
regex_t re_duration;
regex_t re_desc_doc;
regex_t re_xml_path;
// Make sure all vars are 0 or \0 terminated
vars->debug = 0;
vars->forwardRules = 0;
strcpy(vars->iptables,"");
strcpy(vars->forwardChainName,"");
strcpy(vars->preroutingChainName,"");
strcpy(vars->upstreamBitrate,"");
strcpy(vars->downstreamBitrate,"");
vars->duration = DEFAULT_DURATION;
strcpy(vars->descDocName,"");
strcpy(vars->xmlPath,"");
// Regexp to match a comment line
regcomp(&re_comment,"^[[:blank:]]*#",0);
regcomp(&re_empty_row,"^[[:blank:]]*\r?\n$",REG_EXTENDED);
// Regexps to match configuration file settings
regcomp(&re_iptables_location,"iptables_location[[:blank:]]*=[[:blank:]]*\"([^\"]+)\"",REG_EXTENDED);
regcomp(&re_debug_mode,"debug_mode[[:blank:]]*=[[:blank:]]*([[:digit:]])",REG_EXTENDED);
regcomp(&re_insert_forward_rules_yes,"insert_forward_rules[[:blank:]]*=[[:blank:]]*yes",REG_ICASE);
regcomp(&re_forward_chain_name,"forward_chain_name[[:blank:]]*=[[:blank:]]*([[:alpha:]_-]+)",REG_EXTENDED);
regcomp(&re_prerouting_chain_name,"prerouting_chain_name[[:blank:]]*=[[:blank:]]([[:alpha:]_-]+)",REG_EXTENDED);
regcomp(&re_upstream_bitrate,"upstream_bitrate[[:blank:]]*=[[:blank:]]*([[:digit:]]+)",REG_EXTENDED);
regcomp(&re_downstream_bitrate,"downstream_bitrate[[:blank:]]*=[[:blank:]]*([[:digit:]]+)",REG_EXTENDED);
regcomp(&re_duration,"duration[[:blank:]]*=[[:blank:]]*(@?)([[:digit:]]+|[[:digit:]]+{2}:[[:digit:]]+{2})",REG_EXTENDED);
regcomp(&re_desc_doc,"description_document_name[[:blank:]]*=[[:blank:]]*([[:alpha:].]{1,20})",REG_EXTENDED);
regcomp(&re_xml_path,"xml_document_path[[:blank:]]*=[[:blank:]]*([[:alpha:]_/.]{1,50})",REG_EXTENDED);
if ((conf_file=fopen(CONF_FILE,"r")) != NULL)
{
char line[MAX_CONFIG_LINE];
// Walk through the config file line by line
while(fgets(line,MAX_CONFIG_LINE,conf_file) != NULL)
{
// Check if a comment line or an empty one
if ( (0 != regexec(&re_comment,line,0,NULL,0) ) &&
(0 != regexec(&re_empty_row,line,0,NULL,0)) )
{
// Chec if iptables_location
if (regexec(&re_iptables_location,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->iptables, PATH_LEN, line, submatch);
}
// Check is insert_forward_rules
else if (regexec(&re_insert_forward_rules_yes,line,0,NULL,0) == 0)
{
vars->forwardRules = 1;
}
// Check forward_chain_name
else if (regexec(&re_forward_chain_name,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->forwardChainName, CHAIN_NAME_LEN, line, submatch);
}
else if (regexec(&re_debug_mode,line,NMATCH,submatch,0) == 0)
{
char tmp[2];
getConfigOptionArgument(tmp,sizeof(tmp),line,submatch);
vars->debug = atoi(tmp);
}
else if (regexec(&re_prerouting_chain_name,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->preroutingChainName, CHAIN_NAME_LEN, line, submatch);
}
else if (regexec(&re_upstream_bitrate,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->upstreamBitrate, BITRATE_LEN, line, submatch);
}
else if (regexec(&re_downstream_bitrate,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->downstreamBitrate, BITRATE_LEN, line, submatch);
}
else if (regexec(&re_duration,line,NMATCH,submatch,0) == 0)
{
getConfigOptionDuration(&vars->duration,line,submatch);
}
else if (regexec(&re_desc_doc,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->descDocName, PATH_LEN, line, submatch);
}
else if (regexec(&re_xml_path,line,NMATCH,submatch,0) == 0)
{
getConfigOptionArgument(vars->xmlPath, PATH_LEN, line, submatch);
}
else
{
// We end up here if ther is an unknown config directive
printf("Unknown config line:%s",line);
}
}
}
fclose(conf_file);
}
regfree(&re_comment);
regfree(&re_empty_row);
regfree(&re_iptables_location);
regfree(&re_debug_mode);
regfree(&re_insert_forward_rules_yes);
regfree(&re_forward_chain_name);
regfree(&re_prerouting_chain_name);
regfree(&re_upstream_bitrate);
regfree(&re_downstream_bitrate);
regfree(&re_duration);
regfree(&re_desc_doc);
regfree(&re_xml_path);
// Set default values for options not found in config file
if (strnlen(vars->forwardChainName, CHAIN_NAME_LEN) == 0)
{
// No forward chain name was set in conf file, set it to default
snprintf(vars->forwardChainName, CHAIN_NAME_LEN, IPTABLES_DEFAULT_FORWARD_CHAIN);
}
if (strnlen(vars->preroutingChainName, CHAIN_NAME_LEN) == 0)
{
// No prerouting chain name was set in conf file, set it to default
snprintf(vars->preroutingChainName, CHAIN_NAME_LEN, IPTABLES_DEFAULT_PREROUTING_CHAIN);
}
if (strnlen(vars->upstreamBitrate, BITRATE_LEN) == 0)
{
// No upstream_bitrate was found in the conf file, set it to default
snprintf(vars->upstreamBitrate, BITRATE_LEN, DEFAULT_UPSTREAM_BITRATE);
}
if (strnlen(vars->downstreamBitrate, BITRATE_LEN) == 0)
{
// No downstream bitrate was found in the conf file, set it to default
snprintf(vars->downstreamBitrate, BITRATE_LEN, DEFAULT_DOWNSTREAM_BITRATE);
}
if (strnlen(vars->descDocName, PATH_LEN) == 0)
{
snprintf(vars->descDocName, PATH_LEN, DESC_DOC_DEFAULT);
}
if (strnlen(vars->xmlPath, PATH_LEN) == 0)
{
snprintf(vars->xmlPath, PATH_LEN, XML_PATH_DEFAULT);
}
if (strnlen(vars->iptables, PATH_LEN) == 0) {
// Can't find the iptables executable, return -1 to
// indicate en error
return -1;
}
else
{
return 0;
}
}