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// file : web/apache/service.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <web/apache/service>
#include <unistd.h> // getppid()
#include <signal.h> // kill()
#include <httpd.h>
#include <http_config.h>
#include <memory> // unique_ptr
#include <string>
#include <cassert>
#include <utility> // move()
#include <cstring> // strlen()
#include <exception>
#include <web/module>
using namespace std;
namespace web
{
namespace apache
{
void service::
init_directives ()
{
assert (cmds == nullptr);
// Fill apache module directive definitions. Directives share
// common name space in apache configuration file, so to prevent name
// clash have to form directive name as a combination of module and
// option names: <module name>-<option name>. This why for option
// bar of module foo the corresponding directive will appear in apache
// configuration file as foo-bar.
//
const option_descriptions& od (exemplar_.options ());
unique_ptr<command_rec[]> directives (new command_rec[od.size () + 1]);
command_rec* d (directives.get ());
for (const auto& o: od)
{
auto i (option_descriptions_.emplace (name_ + "-" + o.first, o.second));
assert (i.second);
*d++ =
{
i.first->first.c_str (),
reinterpret_cast<cmd_func> (parse_option),
this,
RSRC_CONF,
// Move away from TAKE1 to be able to handle empty string and
// no-value.
//
RAW_ARGS,
nullptr
};
}
*d = {nullptr, nullptr, nullptr, 0, RAW_ARGS, nullptr};
cmds = directives.release ();
}
const char* service::
parse_option (cmd_parms* parms, void*, const char* args) noexcept
{
// @@ Current implementation does not consider configuration context
// (server config, virtual host, directory) for directive parsing, nor
// for request handling.
//
service& srv (*reinterpret_cast<service*> (parms->cmd->cmd_data));
if (srv.options_parsed_)
// Apache is inside the second pass of its messy initialization cycle
// (more details at http://wiki.apache.org/httpd/ModuleLife). Just
// ignore it.
//
return 0;
// 'args' is an optionally double-quoted string. It uses double quotes
// to distinguish empty string from no-value case.
//
assert (args != nullptr);
optional<string> value;
if (auto l = strlen (args))
value = l >= 2 && args[0] == '"' && args[l - 1] == '"'
? string (args + 1, l - 2)
: args;
return srv.add_option (parms->cmd->name, move (value));
}
const char* service::
add_option (const char* name, optional<string> value)
{
auto i (option_descriptions_.find (name));
assert (i != option_descriptions_.end ());
// Check that option value presense is expected.
//
if (i->second != static_cast<bool> (value))
return value ? "unexpected value" : "value expected";
options_.emplace_back (name + name_.length () + 1, move (value));
return 0;
}
void service::
init_worker (log& l) noexcept
{
const string func_name (
"web::apache::service<" + name_ + ">::init_worker");
try
{
exemplar_.init (options_, l);
}
catch (const exception& e)
{
l.write (nullptr, 0, func_name.c_str (), APLOG_EMERG, e.what ());
// Terminate the root apache process. Indeed we can only try to
// terminate the process, and most likely will fail in a production
// environment where the apache root process usually runs under root
// and worker processes run under some other user. This is why the
// implementation should consider the possibility of not being
// initialized at the time of HTTP request processing. In such a case
// it should respond with an internal server error (500 HTTP status),
// reporting misconfiguration.
//
::kill (::getppid (), SIGTERM);
}
catch (...)
{
l.write (nullptr,
0,
func_name.c_str (),
APLOG_EMERG,
"unknown error");
// Terminate the root apache process.
//
::kill (::getppid (), SIGTERM);
}
}
}
}
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