gvpe/src/vpn_tcp.C

/*
    vpn_tcp.C -- handle the tcp part of the protocol.
    Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de>
 
    This file is part of GVPE.

    GVPE 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 gvpe; if not, write to the Free Software
    Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "config.h"

#if ENABLE_TCP

// tcp processing is extremely ugly, since the gvpe protocol is simply
// designed for unreliable datagram networks. tcp is implemented by
// multiplexing packets over tcp. errors are completely ignored, as we
// rely on the higher level layers to time out and reconnect.

#include <cstring>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>

#include <map>

#include "netcompat.h"

#include "vpn.h"

#if ENABLE_HTTP_PROXY
# include "conf.h"
#endif

struct tcp_connection;

struct lt_sockinfo
{
  bool operator()(const sockinfo *a, const sockinfo *b) const
  {
    return *a < *b;
  }
};

struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> {
  void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;

  tcp_si_map ()
  : cleaner(this, &tcp_si_map::cleaner_cb)
  {
    cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2);
  }

} tcp_si;

struct tcp_connection : ev::io {
  tstamp last_activity;
  const sockinfo si;
  vpn &v;
  bool active; // this connection has been actively established
  enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state;

  vpn_packet *r_pkt;
  u32 r_len, r_ofs;

  vpn_packet *w_pkt;
  u32 w_len, w_ofs;

#if ENABLE_HTTP_PROXY
  char *proxy_req;
  int proxy_req_len;
#endif

  void tcpv4_ev (ev::io &w, int revents);

  bool send_packet (vpn_packet *pkt, int tos);
  bool write_packet ();

  void error (); // abort conenction && cleanup

  operator tcp_si_map::value_type()
  {
    return tcp_si_map::value_type (&si, this);
  }

  tcp_connection (int fd_, const sockinfo &si_, vpn &v_);
  ~tcp_connection ();
};

void tcp_si_map::cleaner_cb (ev::timer &w, int revents)
{
  tstamp to = ev::ev_now () - ::conf.keepalive - 30 - 60;

  for (iterator i = begin (); i != end(); )
    if (i->second->last_activity >= to)
      ++i;
    else
      {
        delete i->second;
        erase (i);
        i = begin ();
      }
}

void
vpn::tcpv4_ev (ev::io &w, int revents)
{
  if (revents & EV_READ)
    {
      struct sockaddr_in sa;
      socklen_t sa_len = sizeof (sa);
      int len;

      int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);

      if (fd >= 0)
        {
          fcntl (fd, F_SETFL, O_NONBLOCK);
          fcntl (fd, F_SETFD, FD_CLOEXEC);

          sockinfo si(sa, PROT_TCPv4);

          slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D

          tcp_connection *i = new tcp_connection (fd, si, *this);
          tcp_si.insert (*i);
        }
    }
}

bool
vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
{
  tcp_si_map::iterator info = tcp_si.find (&si);

  tcp_connection *i;

  if (info == tcp_si.end ())
    {
      i = new tcp_connection (-1, si, *this);
      tcp_si.insert (*i);
    }
  else
    i = info->second;

  return i->send_packet (pkt, tos);
}

bool
tcp_connection::write_packet ()
{
  ssize_t len;

  if (w_ofs < 2)
    {
      u16 plen = htons (w_pkt->len);

      iovec vec[2];
      //TODO: char* is the right type? hardly...
      vec[0].iov_base = (char *)((u8 *)&plen) + w_ofs;
      vec[0].iov_len = 2 - w_ofs;
      vec[1].iov_base = (char *)&((*w_pkt)[0]);
      vec[1].iov_len = w_len - 2;

      len = writev (fd, vec, 2);
    }
  else
    len = write (fd, &((*w_pkt)[w_ofs - 2]), w_len);

  if (len > 0)
    {
      w_ofs += len;
      w_len -= len;

      return w_len == 0;
    }
  else if (len < 0 && (errno == EAGAIN || errno == EINTR))
    return false;
  else
    {
      error ();
      return false;
    }
}

void
tcp_connection::tcpv4_ev (ev::io &w, int revents)
{
  last_activity = ev::ev_now ();

  if (revents & EV_WRITE)
    {
      if (state == CONNECTING)
        {
          state = ESTABLISHED;
          set (EV_READ);
#if ENABLE_HTTP_PROXY
          if (::conf.proxy_host && ::conf.proxy_port)
            {
              state = CONNECTING_PROXY;

              if (write (fd, proxy_req, proxy_req_len) == 0)
                {
                  error ();
                  return;
                }

              free (proxy_req); proxy_req = 0;
            }
#endif
        }
      else if (state == ESTABLISHED)
        {
          if (w_pkt)
            {
              if (write_packet ())
                {
                  delete w_pkt; w_pkt = 0;

                  set (EV_READ);
                }
            }
          else
            set (EV_READ);
        }
      else
        set (EV_READ);
    }

  if (revents & EV_READ)
    {
      if (state == ESTABLISHED)
        for (;;)
          {
            if (!r_pkt)
              {
                r_pkt = new vpn_packet;
                r_ofs = 0;
                r_len = 2; // header
              }

            ssize_t len = read (fd, &((*r_pkt)[r_ofs < 2 ? r_ofs : r_ofs - 2]), r_len);

            if (len > 0)
              {
                r_len -= len;
                r_ofs += len;

                if (r_len == 0)
                  {
                    if (r_ofs == 2)
                      {
                        r_len = ntohs (*(u16 *)&((*r_pkt)[0]));
                        r_pkt->len = r_len;

                        if (r_len > 0 && r_len < MAXSIZE)
                          continue;
                      }
                    else
                      {
                        v.recv_vpn_packet (r_pkt, si);
                        delete r_pkt;
                        r_pkt = 0;

                        continue;
                      }
                  }
                else
                  break;
              }
            else if (len < 0 && (errno == EINTR || errno == EAGAIN))
              break;

            // len == 0 <-> EOF
            error ();
            break;
          }
#if ENABLE_HTTP_PROXY
      else if (state == CONNECTING_PROXY)
        {
          fcntl (fd, F_SETFL, 0);
          char r[1024];
          int i;
          bool emptyline = false;

          // we do a blocking read of the response, to hell with it
          for (i = 0; i < 1023; i++)
            {
              int l = read (fd, &r[i], 1);

              if (l <= 0)
                {
                  error ();
                  return;
                }

              if (r[i] == '\012')
                {
                  if (emptyline)
                    break;
                  else
                    emptyline = true;
                }
              else if (r[i] != '\015')
                emptyline = false;
            }

          fcntl (fd, F_SETFL, O_NONBLOCK);

          if (i < 12)
            {
              slog (L_ERR, _("(%s): unable to do proxy-forwarding, short response"),
                    (const char *)si);
              error ();
            }
          else if (r[0] != 'H' || r[1] != 'T' || r[2] != 'T' || r[3] != 'P' || r[4] != '/'
                   || r[5] != '1' // http-major
                   || r[9] != '2') // response
            {
              slog (L_ERR, _("(%s): malformed or unexpected proxy response (%.12s)"),
                    (const char *)si, r);
              error ();
            }
          else
            state = ESTABLISHED;
        }
#endif
    }
}

bool
tcp_connection::send_packet (vpn_packet *pkt, int tos)
{
  last_activity = ev::ev_now ();

  if (state == IDLE)
    {
      // woaw, the first lost packet ;)
      fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);

      if (fd >= 0)
        {
          const sockinfo *csi = &si;

#if ENABLE_HTTP_PROXY
          sockinfo psi;

          if (::conf.proxy_host && ::conf.proxy_port)
            {
              psi.set (::conf.proxy_host, ::conf.proxy_port, PROT_TCPv4);

              if (psi.valid ())
                {
                  csi = &psi;

                  proxy_req_len = asprintf (&proxy_req,
                                            "CONNECT %s:%d HTTP/1.0\015\012"
                                            "%s%s%s" // optional proxy-auth
                                            "\015\012",
                                            si.ntoa (),
                                            ntohs (si.port),
                                            ::conf.proxy_auth ? "Proxy-Authorization: Basic " : "",
                                            ::conf.proxy_auth ? ::conf.proxy_auth             : "",
                                            ::conf.proxy_auth ? "\015\012"                    : "");

                }
              else
                slog (L_ERR, _("unable to resolve http proxy hostname '%s', trying direct"),
                      ::conf.proxy_host);
            }
#endif
          
          fcntl (fd, F_SETFL, O_NONBLOCK);

          if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
              || errno == EINPROGRESS)
            {
              fcntl (fd, F_SETFL, O_NONBLOCK);
              fcntl (fd, F_SETFD, FD_CLOEXEC);

              state = CONNECTING;
              start (fd, EV_WRITE);
            }
          else
            close (fd);
        }
    }
  else if (state == ESTABLISHED)
    {
      // drop packet if the tcp write buffer is full. this *is* the
      // right thing to do, not using tcp *is* the right thing to do.
      if (!w_pkt)
        {
          // how this maps to the underlying tcp packets we don't know
          // and we don't care. at least we tried ;)
#if defined(SOL_IP) && defined(IP_TOS)
          setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
#endif

          w_pkt = pkt;
          w_ofs = 0;
          w_len = pkt->len + 2; // length + size header

          if (write_packet ())
            w_pkt = 0;
          else
            {
              w_pkt = new vpn_packet;
              w_pkt->set (*pkt);

              set (EV_READ | EV_WRITE);
            }
        }
    }

  return state != ERROR;
}

void tcp_connection::error ()
{
  stop ();

  if (fd >= 0)
    {
      close (fd);
      fd = -1;
    }

  delete r_pkt; r_pkt = 0;
  delete w_pkt; w_pkt = 0;
#if ENABLE_HTTP_PROXY
  free (proxy_req); proxy_req = 0;
#endif

  state = active ? IDLE : ERROR;
}

tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
: v(v_), si(si_), ev::io(this, &tcp_connection::tcpv4_ev)
{
  last_activity = ev::ev_now ();
  r_pkt = 0;
  w_pkt = 0;
  fd = fd_;
#if ENABLE_HTTP_PROXY
  proxy_req = 0;
#endif

  if (fd < 0)
    {
      active = true;
      state = IDLE;
    }
  else
    {
      active = false;
      state = ESTABLISHED;
      start (fd, EV_READ);
    }
}

tcp_connection::~tcp_connection ()
{
  error ();
}

#endif

Revision:	1.19
Committed:	Tue Nov 13 02:12:08 2007 UTC (16 years, 6 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.18:	+4 -6 lines
Log Message:	do not leak tcp conenctions
#	User	Rev	Content
1	pcg	1.1	/*
2			vpn_tcp.C -- handle the tcp part of the protocol.
3	pcg	1.18	Copyright (C) 2003-2007 Marc Lehmann <gvpe@schmorp.de>
4	pcg	1.1
5	pcg	1.12	This file is part of GVPE.
6
7			GVPE is free software; you can redistribute it and/or modify
8	pcg	1.1	it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18	pcg	1.12	along with gvpe; if not, write to the Free Software
19	pcg	1.14	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	pcg	1.1	*/
21
22			#include "config.h"
23
24			#if ENABLE_TCP
25
26	pcg	1.19	// tcp processing is extremely ugly, since the gvpe protocol is simply
27	pcg	1.1	// designed for unreliable datagram networks. tcp is implemented by
28			// multiplexing packets over tcp. errors are completely ignored, as we
29	pcg	1.19	// rely on the higher level layers to time out and reconnect.
30	pcg	1.1
31			#include <cstring>
32
33			#include <sys/types.h>
34			#include <sys/socket.h>
35			#include <sys/wait.h>
36			#include <sys/uio.h>
37			#include <errno.h>
38			#include <time.h>
39			#include <unistd.h>
40	pcg	1.9	#include <fcntl.h>
41	pcg	1.1
42			#include <map>
43	pcg	1.8
44			#include "netcompat.h"
45	pcg	1.1
46			#include "vpn.h"
47
48	pcg	1.4	#if ENABLE_HTTP_PROXY
49			# include "conf.h"
50			#endif
51
52	pcg	1.1	struct tcp_connection;
53
54			struct lt_sockinfo
55			{
56			bool operator()(const sockinfo a, const sockinfo b) const
57			{
58			return a < b;
59			}
60			};
61
62			struct tcp_si_map : public map<const sockinfo , tcp_connection , lt_sockinfo> {
63	pcg	1.17	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
64	pcg	1.1
65			tcp_si_map ()
66	pcg	1.13	: cleaner(this, &tcp_si_map::cleaner_cb)
67	pcg	1.17	{
68	pcg	1.19	cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2);
69	pcg	1.17	}
70	pcg	1.13
71	pcg	1.1	} tcp_si;
72
73	pcg	1.17	struct tcp_connection : ev::io {
74	pcg	1.1	tstamp last_activity;
75			const sockinfo si;
76			vpn &v;
77			bool active; // this connection has been actively established
78	pcg	1.4	enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state;
79	pcg	1.1
80			vpn_packet *r_pkt;
81			u32 r_len, r_ofs;
82
83	pcg	1.3	vpn_packet *w_pkt;
84			u32 w_len, w_ofs;
85
86	pcg	1.4	#if ENABLE_HTTP_PROXY
87			char *proxy_req;
88			int proxy_req_len;
89			#endif
90
91	pcg	1.17	void tcpv4_ev (ev::io &w, int revents);
92	pcg	1.1
93	pcg	1.2	bool send_packet (vpn_packet *pkt, int tos);
94	pcg	1.3	bool write_packet ();
95	pcg	1.1
96			void error (); // abort conenction && cleanup
97
98			operator tcp_si_map::value_type()
99	pcg	1.13	{
100			return tcp_si_map::value_type (&si, this);
101			}
102	pcg	1.1
103			tcp_connection (int fd_, const sockinfo &si_, vpn &v_);
104			~tcp_connection ();
105			};
106
107	pcg	1.17	void tcp_si_map::cleaner_cb (ev::timer &w, int revents)
108	pcg	1.1	{
109	pcg	1.17	tstamp to = ev::ev_now () - ::conf.keepalive - 30 - 60;
110	pcg	1.1
111			for (iterator i = begin (); i != end(); )
112			if (i->second->last_activity >= to)
113			++i;
114			else
115			{
116	pcg	1.19	delete i->second;
117	pcg	1.1	erase (i);
118			i = begin ();
119			}
120			}
121
122			void
123	pcg	1.17	vpn::tcpv4_ev (ev::io &w, int revents)
124	pcg	1.1	{
125	pcg	1.17	if (revents & EV_READ)
126	pcg	1.1	{
127			struct sockaddr_in sa;
128			socklen_t sa_len = sizeof (sa);
129			int len;
130
131			int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);
132
133			if (fd >= 0)
134			{
135	pcg	1.16	fcntl (fd, F_SETFL, O_NONBLOCK);
136			fcntl (fd, F_SETFD, FD_CLOEXEC);
137
138	pcg	1.1	sockinfo si(sa, PROT_TCPv4);
139
140			slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D
141
142			tcp_connection i = new tcp_connection (fd, si, this);
143			tcp_si.insert (*i);
144			}
145			}
146			}
147
148	pcg	1.2	bool
149	pcg	1.1	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
150			{
151			tcp_si_map::iterator info = tcp_si.find (&si);
152
153			tcp_connection *i;
154
155			if (info == tcp_si.end ())
156			{
157			i = new tcp_connection (-1, si, *this);
158			tcp_si.insert (*i);
159			}
160			else
161			i = info->second;
162
163	pcg	1.2	return i->send_packet (pkt, tos);
164	pcg	1.1	}
165
166	pcg	1.3	bool
167			tcp_connection::write_packet ()
168			{
169			ssize_t len;
170
171			if (w_ofs < 2)
172			{
173			u16 plen = htons (w_pkt->len);
174
175			iovec vec[2];
176	pcg	1.7	//TODO: char* is the right type? hardly...
177			vec[0].iov_base = (char )((u8 )&plen) + w_ofs;
178	pcg	1.3	vec[0].iov_len = 2 - w_ofs;
179	pcg	1.7	vec[1].iov_base = (char )&((w_pkt)[0]);
180	pcg	1.3	vec[1].iov_len = w_len - 2;
181
182			len = writev (fd, vec, 2);
183			}
184			else
185			len = write (fd, &((*w_pkt)[w_ofs - 2]), w_len);
186
187			if (len > 0)
188			{
189			w_ofs += len;
190			w_len -= len;
191
192			return w_len == 0;
193			}
194			else if (len < 0 && (errno == EAGAIN \|\| errno == EINTR))
195			return false;
196			else
197			{
198			error ();
199			return false;
200			}
201			}
202
203	pcg	1.1	void
204	pcg	1.17	tcp_connection::tcpv4_ev (ev::io &w, int revents)
205	pcg	1.1	{
206	pcg	1.17	last_activity = ev::ev_now ();
207	pcg	1.1
208	pcg	1.17	if (revents & EV_WRITE)
209	pcg	1.3	{
210			if (state == CONNECTING)
211			{
212			state = ESTABLISHED;
213	pcg	1.17	set (EV_READ);
214	pcg	1.4	#if ENABLE_HTTP_PROXY
215			if (::conf.proxy_host && ::conf.proxy_port)
216			{
217			state = CONNECTING_PROXY;
218	pcg	1.11
219			if (write (fd, proxy_req, proxy_req_len) == 0)
220			{
221			error ();
222			return;
223			}
224
225	pcg	1.4	free (proxy_req); proxy_req = 0;
226			}
227			#endif
228	pcg	1.3	}
229			else if (state == ESTABLISHED)
230			{
231			if (w_pkt)
232			{
233			if (write_packet ())
234			{
235			delete w_pkt; w_pkt = 0;
236
237	pcg	1.17	set (EV_READ);
238	pcg	1.3	}
239			}
240			else
241	pcg	1.17	set (EV_READ);
242	pcg	1.3	}
243			else
244	pcg	1.17	set (EV_READ);
245	pcg	1.3	}
246
247	pcg	1.17	if (revents & EV_READ)
248	pcg	1.1	{
249	pcg	1.4	if (state == ESTABLISHED)
250			for (;;)
251			{
252			if (!r_pkt)
253			{
254			r_pkt = new vpn_packet;
255			r_ofs = 0;
256			r_len = 2; // header
257			}
258
259			ssize_t len = read (fd, &((*r_pkt)[r_ofs < 2 ? r_ofs : r_ofs - 2]), r_len);
260
261			if (len > 0)
262			{
263			r_len -= len;
264			r_ofs += len;
265
266			if (r_len == 0)
267			{
268			if (r_ofs == 2)
269			{
270			r_len = ntohs ((u16 )&((*r_pkt)[0]));
271			r_pkt->len = r_len;
272
273			if (r_len > 0 && r_len < MAXSIZE)
274			continue;
275			}
276			else
277			{
278			v.recv_vpn_packet (r_pkt, si);
279			delete r_pkt;
280			r_pkt = 0;
281
282			continue;
283			}
284			}
285			else
286			break;
287			}
288			else if (len < 0 && (errno == EINTR \|\| errno == EAGAIN))
289			break;
290
291	pcg	1.11	// len == 0 <-> EOF
292	pcg	1.4	error ();
293			break;
294			}
295			#if ENABLE_HTTP_PROXY
296			else if (state == CONNECTING_PROXY)
297	pcg	1.1	{
298	pcg	1.4	fcntl (fd, F_SETFL, 0);
299			char r[1024];
300			int i;
301			bool emptyline = false;
302	pcg	1.1
303	pcg	1.4	// we do a blocking read of the response, to hell with it
304			for (i = 0; i < 1023; i++)
305	pcg	1.1	{
306	pcg	1.4	int l = read (fd, &r[i], 1);
307	pcg	1.1
308	pcg	1.4	if (l <= 0)
309	pcg	1.1	{
310	pcg	1.4	error ();
311			return;
312			}
313	pcg	1.1
314	pcg	1.4	if (r[i] == '\012')
315			{
316			if (emptyline)
317			break;
318	pcg	1.1	else
319	pcg	1.4	emptyline = true;
320	pcg	1.1	}
321	pcg	1.4	else if (r[i] != '\015')
322			emptyline = false;
323	pcg	1.1	}
324
325	pcg	1.4	fcntl (fd, F_SETFL, O_NONBLOCK);
326
327			if (i < 12)
328			{
329	pcg	1.6	slog (L_ERR, _("(%s): unable to do proxy-forwarding, short response"),
330	pcg	1.5	(const char *)si);
331	pcg	1.4	error ();
332			}
333			else if (r[0] != 'H' \|\| r[1] != 'T' \|\| r[2] != 'T' \|\| r[3] != 'P' \|\| r[4] != '/'
334			\|\| r[5] != '1' // http-major
335			\|\| r[9] != '2') // response
336			{
337	pcg	1.6	slog (L_ERR, _("(%s): malformed or unexpected proxy response (%.12s)"),
338	pcg	1.5	(const char *)si, r);
339	pcg	1.4	error ();
340			}
341			else
342			state = ESTABLISHED;
343	pcg	1.1	}
344	pcg	1.4	#endif
345	pcg	1.1	}
346			}
347
348	pcg	1.2	bool
349	pcg	1.1	tcp_connection::send_packet (vpn_packet *pkt, int tos)
350			{
351	pcg	1.17	last_activity = ev::ev_now ();
352	pcg	1.1
353			if (state == IDLE)
354			{
355			// woaw, the first lost packet ;)
356			fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
357
358			if (fd >= 0)
359			{
360	pcg	1.4	const sockinfo *csi = &si;
361
362			#if ENABLE_HTTP_PROXY
363			sockinfo psi;
364
365			if (::conf.proxy_host && ::conf.proxy_port)
366			{
367			psi.set (::conf.proxy_host, ::conf.proxy_port, PROT_TCPv4);
368
369			if (psi.valid ())
370			{
371			csi = ψ
372
373			proxy_req_len = asprintf (&proxy_req,
374			"CONNECT %s:%d HTTP/1.0\015\012"
375			"%s%s%s" // optional proxy-auth
376			"\015\012",
377			si.ntoa (),
378			ntohs (si.port),
379			::conf.proxy_auth ? "Proxy-Authorization: Basic " : "",
380			::conf.proxy_auth ? ::conf.proxy_auth : "",
381			::conf.proxy_auth ? "\015\012" : "");
382
383			}
384			else
385			slog (L_ERR, _("unable to resolve http proxy hostname '%s', trying direct"),
386			::conf.proxy_host);
387			}
388			#endif
389
390	pcg	1.1	fcntl (fd, F_SETFL, O_NONBLOCK);
391	pcg	1.4
392			if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
393	pcg	1.1	\|\| errno == EINPROGRESS)
394			{
395	pcg	1.16	fcntl (fd, F_SETFL, O_NONBLOCK);
396			fcntl (fd, F_SETFD, FD_CLOEXEC);
397
398	pcg	1.1	state = CONNECTING;
399	pcg	1.17	start (fd, EV_WRITE);
400	pcg	1.1	}
401			else
402			close (fd);
403			}
404			}
405			else if (state == ESTABLISHED)
406			{
407	pcg	1.3	// drop packet if the tcp write buffer is full. this is the
408			// right thing to do, not using tcp is the right thing to do.
409			if (!w_pkt)
410			{
411			// how this maps to the underlying tcp packets we don't know
412			// and we don't care. at least we tried ;)
413	pcg	1.7	#if defined(SOL_IP) && defined(IP_TOS)
414	pcg	1.3	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
415	pcg	1.7	#endif
416	pcg	1.3
417			w_pkt = pkt;
418			w_ofs = 0;
419			w_len = pkt->len + 2; // length + size header
420
421			if (write_packet ())
422			w_pkt = 0;
423			else
424			{
425			w_pkt = new vpn_packet;
426			w_pkt->set (*pkt);
427	pcg	1.1
428	pcg	1.17	set (EV_READ \| EV_WRITE);
429	pcg	1.3	}
430			}
431	pcg	1.1	}
432	pcg	1.2
433			return state != ERROR;
434	pcg	1.1	}
435
436	pcg	1.4	void tcp_connection::error ()
437			{
438	pcg	1.18	stop ();
439
440	pcg	1.4	if (fd >= 0)
441			{
442			close (fd);
443			fd = -1;
444			}
445
446			delete r_pkt; r_pkt = 0;
447			delete w_pkt; w_pkt = 0;
448			#if ENABLE_HTTP_PROXY
449			free (proxy_req); proxy_req = 0;
450			#endif
451
452			state = active ? IDLE : ERROR;
453			}
454
455	pcg	1.1	tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
456	pcg	1.17	: v(v_), si(si_), ev::io(this, &tcp_connection::tcpv4_ev)
457	pcg	1.1	{
458	pcg	1.17	last_activity = ev::ev_now ();
459	pcg	1.1	r_pkt = 0;
460	pcg	1.3	w_pkt = 0;
461	pcg	1.1	fd = fd_;
462	pcg	1.4	#if ENABLE_HTTP_PROXY
463			proxy_req = 0;
464			#endif
465	pcg	1.1
466			if (fd < 0)
467			{
468			active = true;
469			state = IDLE;
470			}
471			else
472			{
473			active = false;
474			state = ESTABLISHED;
475	pcg	1.17	start (fd, EV_READ);
476	pcg	1.1	}
477			}
478
479			tcp_connection::~tcp_connection ()
480			{
481			error ();
482			}
483
484			#endif
485