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/*************************************************
* Configuration Reader Source File *
* (C) 1999-2005 The Botan Project *
*************************************************/
#include <botan/conf.h>
#include <botan/lookup.h>
#include <botan/look_add.h>
#include <botan/oids.h>
#include <botan/charset.h>
#include <botan/parsing.h>
#include <fstream>
#include <map>
namespace Botan {
namespace {
/*************************************************
* Strip comments and whitespace from line *
*************************************************/
std::string strip_whitespace(const std::string& line)
{
bool is_escaped = false, in_quote = false, in_string = false;
std::string new_line;
for(std::string::const_iterator j = line.begin(); j != line.end(); j++)
{
const char c = *j;
if(c == '"' && !is_escaped && !in_string)
{ in_quote = !in_quote; continue; }
if(c == '\'' && !is_escaped && !in_quote)
{ in_string = !in_string; continue; }
if(c == '#' && !is_escaped && !in_quote && !in_string)
return new_line;
if(c == '\\' && !is_escaped) { is_escaped = true; continue; }
if(is_space(c) && !in_quote && !in_string && !is_escaped)
continue;
new_line += c;
is_escaped = false;
}
return new_line;
}
/*************************************************
* Do variable interpolation *
*************************************************/
std::string interpolate(const std::string& value,
const std::map<std::string, std::string>& variables)
{
std::string variable, suffix;
if(value.find('.') == std::string::npos)
variable = value;
else
{
variable = value.substr(0, value.find('.'));
suffix = value.substr(value.find('.'), std::string::npos);
}
if(variables.find(variable) != variables.end())
{
const std::string result = variables.find(variable)->second;
if(variable == result)
return value;
return interpolate(result, variables) + suffix;
}
return value;
}
}
namespace Config {
/*************************************************
* Load a configuration file *
*************************************************/
void load(const std::string& fsname)
{
std::ifstream config(fsname.c_str());
if(!config)
throw Config_Error("Could not open config file " + fsname);
u32bit line_no = 0;
std::string line, section;
std::map<std::string, std::string> variables;
while(std::getline(config, line))
{
line_no++;
line = strip_whitespace(line);
if(line == "")
continue;
if(line[0] == '[' && line[line.size()-1] == ']')
{
section = line.substr(1, line.size() - 2);
if(section == "")
throw Config_Error("Empty section name", line_no);
continue;
}
if(section == "")
throw Config_Error("Section must be set before assignment", line_no);
std::vector<std::string> name_and_value;
try {
name_and_value = split_on(line, '=');
}
catch(Format_Error)
{
throw Config_Error("Bad assignment: " + line, line_no);
}
if(name_and_value.size() != 2)
throw Config_Error("Bad line: " + line, line_no);
const std::string name = name_and_value[0];
const std::string value = interpolate(name_and_value[1], variables);
if(variables.find(name) == variables.end())
variables[name] = value;
if(section == "oids")
OIDS::add_oid(OID(value), name);
else if(section == "aliases")
add_alias(name, value);
else
set(section + '/' + name, value);
}
}
}
}
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