Return false if `setsockopt()` failed in `setTCPNoDelay()`

[thirdparty/pdns.git] / pdns / dynmessenger.cc

/*
    PowerDNS Versatile Database Driven Nameserver
    Copyright (C) 2002 - 2008  PowerDNS.COM BV

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2
    as published by the Free Software Foundation

    Additionally, the license of this program contains a special
    exception which allows to distribute the program in binary form when
    it is linked against OpenSSL.

    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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "dynmessenger.hh"
#include <cstdio>
#include "utility.hh"
#include <cstdlib>
#include <cstring>
#include <cerrno>
#include <iostream>
#include <sys/types.h>
#include <sys/stat.h>

DynMessenger::DynMessenger(const string &fname,
    int timeout_sec,
    int timeout_usec)
{
  d_s=socket(AF_UNIX,SOCK_STREAM,0);
  setCloseOnExec(d_s);
  
  if(d_s<0) {
    throw PDNSException(string("socket")+strerror(errno));
  }

  try {
    if(makeUNsockaddr(fname, &d_remote))
      throw PDNSException("Unable to connect to remote '"+fname+"': Path is not a valid UNIX socket path.");

    struct timeval timeout;
    timeout.tv_sec = timeout_sec;
    timeout.tv_usec = timeout_usec;

    if (setsockopt (d_s, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout)) < 0)
      throw PDNSException("Unable to set SO_RCVTIMEO option on socket: " + stringerror());

    if (setsockopt (d_s, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout)) < 0)
      throw PDNSException("Unable to set SO_SNDTIMEO option on socket: " + stringerror());

    int ret = Utility::timed_connect(d_s,(sockaddr*)&d_remote,sizeof(d_remote), timeout_sec, timeout_usec);

    if (ret == 0)
      throw TimeoutException("Unable to connect to remote '"+fname+"': "+stringerror());
    else if (ret < 0)
      throw PDNSException("Unable to connect to remote '"+fname+"': "+stringerror());

  } catch(...) {
    close(d_s);
    d_s=-1;
    throw;
  }
}

DynMessenger::DynMessenger(const ComboAddress& remote,
    const string &secret,
    int timeout_sec,
    int timeout_usec)
{
  d_s=socket(AF_INET, SOCK_STREAM,0);
  setCloseOnExec(d_s);
 
  if(d_s<0) {
    throw PDNSException(string("socket")+strerror(errno));
  }

  try {
    struct timeval timeout;
    timeout.tv_sec = timeout_sec;
    timeout.tv_usec = timeout_usec;

    if (setsockopt (d_s, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(timeout)) < 0)
      throw PDNSException("Unable to set SO_RCVTIMEO option on socket: " + stringerror());

    if (setsockopt (d_s, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout)) < 0)
      throw PDNSException("Unable to set SO_SNDTIMEO option on socket: " + stringerror());

    int ret = Utility::timed_connect(d_s, (sockaddr*)&remote, remote.getSocklen(), timeout_sec, timeout_usec);

    if (ret == 0)
      throw TimeoutException("Unable to connect to remote '"+remote.toStringWithPort()+"': "+string(strerror(errno)));
    else if (ret < 0)
      throw PDNSException("Unable to connect to remote '"+remote.toStringWithPort()+"': "+string(strerror(errno)));

    string login=secret+"\n";
    writen2(d_s, login);
  } catch(...) {
    close(d_s);
    d_s=-1;
    throw;
  }
}

DynMessenger::~DynMessenger()
{
  if (d_s > 0)
    close(d_s);
}   

int DynMessenger::send(const string &msg) const
{
  try {
    if(writen2(d_s, msg+"\n") < 0) { // sue me
      perror("sendto");
      return -1;
    }
    return 0;
  } catch(std::runtime_error& e) {
    if (errno == EAGAIN)
      throw TimeoutException("Error from remote in send(): " + string(e.what()));
    else
      throw PDNSException("Error from remote in send(): " + string(e.what()));
  }
}

string DynMessenger::receive() const 
{
  char buffer[1500];

  int retlen;
  string answer;
  for(;;) {
    retlen=recv(d_s,buffer,sizeof(buffer),0);
    if(retlen<0) {
      if (errno == EAGAIN)
        throw TimeoutException("Error from remote in receive(): " + string(strerror(errno)));
      else
        throw PDNSException("Error from remote in receive(): " + string(strerror(errno)));
    }

    answer.append(buffer,retlen);
    if (retlen == 0)
      break;
  }

  return answer;
}