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// nullmailer -- a simple relay-only MTA
// Copyright (C) 2017 Bruce Guenter <bruce@untroubled.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// You can contact me at <bruce@untroubled.org>. There is also a mailing list
// available to discuss this package. To subscribe, send an email to
// <nullmailer-subscribe@lists.untroubled.org>.
#include "config.h"
#include <stdlib.h>
#include <unistd.h>
#include "errcodes.h"
#include "fdbuf/fdbuf.h"
#include "hostname.h"
#include "itoa.h"
#include "mystring/mystring.h"
#include "netstring.h"
#include "protocol.h"
const int default_port = 628;
const int default_tls_port = -1; // No standard for QMQP over SSL exists
const char* cli_program = "qmqp";
const char* cli_help_prefix = "Send an email message via QMQP\n";
class qmqp
{
fdibuf& in;
fdobuf& out;
public:
qmqp(fdibuf& netin, fdobuf& netout);
~qmqp();
void send(fdibuf& msg, unsigned long size, const mystring& env);
};
qmqp::qmqp(fdibuf& netin, fdobuf& netout)
: in(netin), out(netout)
{
}
qmqp::~qmqp()
{
}
bool skip_envelope(fdibuf& msg)
{
if(!msg.rewind())
return false;
mystring tmp;
while(msg.getline(tmp))
if(!tmp)
break;
return msg;
}
void qmqp::send(fdibuf& msg, unsigned long size, const mystring& env)
{
if(!skip_envelope(msg))
protocol_fail(ERR_MSG_READ, "Error re-reading message");
unsigned long fullsize = strlen(itoa(size)) + 1 + size + 1 + env.length();
out << itoa(fullsize) << ":"; // Start the "outer" netstring
out << itoa(size) << ":"; // Start the message netstring
fdbuf_copy(msg, out, true); // Send out the message
out << "," // End the message netstring
<< env // The envelope is already encoded
<< ","; // End the "outer" netstring
if(!out.flush())
protocol_fail(ERR_MSG_WRITE, "Error sending message to remote");
mystring response;
if(!in.getnetstring(response))
protocol_fail(ERR_PROTO, "Response from remote was not a netstring");
switch(response[0]) {
case 'K': protocol_succ(response.c_str()+1); break;
case 'Z': protocol_fail(ERR_MSG_TEMPFAIL, response.c_str()+1); break;
case 'D': protocol_fail(ERR_MSG_PERMFAIL, response.c_str()+1); break;
default: protocol_fail(ERR_PROTO, "Invalid status byte in response");
}
}
bool compute_size(fdibuf& msg, unsigned long& size)
{
char buf[4096];
size = 0;
while(msg.read(buf, 4096))
size += msg.last_count();
if(msg.eof())
size += msg.last_count();
return size > 0;
}
bool make_envelope(fdibuf& msg, mystring& env)
{
mystring tmp;
while(msg.getline(tmp)) {
if(!tmp)
return true;
env += str2net(tmp);
}
return false;
}
bool preload_data(fdibuf& msg, unsigned long& size, mystring& env)
{
return make_envelope(msg, env) &&
compute_size(msg, size);
}
static unsigned long msg_size;
static mystring msg_envelope;
void protocol_prep(fdibuf& in)
{
if(!preload_data(in, msg_size, msg_envelope))
protocol_fail(ERR_MSG_READ, "Error reading message");
}
void protocol_starttls(fdibuf& netin, fdobuf& netout)
{
protocol_fail(ERR_USAGE, "QMQP does not support STARTTLS");
(void)netin;
(void)netout;
}
void protocol_send(fdibuf& in, fdibuf& netin, fdobuf& netout)
{
alarm(60*60); // Connection must close after an hour
qmqp conn(netin, netout);
conn.send(in, msg_size, msg_envelope);
}
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