gvpe/src/vpn_tcp.C

/*
    vpn_tcp.C -- handle the tcp part of the protocol.
    Copyright (C) 2003-2005 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. 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "config.h"

#if ENABLE_TCP

// tcp processing is extremely ugly, since the vpe 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 protocol 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 (time_watcher &w); time_watcher cleaner;

  tcp_si_map ()
    : cleaner(this, &tcp_si_map::cleaner_cb)
    {
      cleaner.start (0);
    }
} tcp_si;

struct tcp_connection : io_watcher {
  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 (io_watcher &w, short 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 (time_watcher &w)
{
  w.start (NOW + 600);

  tstamp to = NOW - ::conf.keepalive - 30 - 60;

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

void
vpn::tcpv4_ev (io_watcher &w, short revents)
{
  if (revents & EVENT_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)
        {
          sockinfo si(sa, PROT_TCPv4);

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

          fcntl (fd, F_SETFL, O_NONBLOCK);

          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 (io_watcher &w, short revents)
{
  last_activity = NOW;

  if (revents & EVENT_WRITE)
    {
      if (state == CONNECTING)
        {
          state = ESTABLISHED;
          set (EVENT_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 (EVENT_READ);
                }
            }
          else
            set (EVENT_READ);
        }
      else
        set (EVENT_READ);
    }

  if (revents & EVENT_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 = 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)
            {
              state = CONNECTING;
              start (fd, EVENT_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 (EVENT_READ | EVENT_WRITE);
            }
        }
    }

  return state != ERROR;
}

void tcp_connection::error ()
{
  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

  stop ();
  state = active ? IDLE : ERROR;
}

tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev)
{
  last_activity = 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, EVENT_READ);
    }
}

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

#endif

Revision:	1.12
Committed:	Thu Mar 3 16:54:34 2005 UTC (19 years, 2 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_8
Changes since 1.11:	+5 -3 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	pcg	1.1	/*
2			vpn_tcp.C -- handle the tcp part of the protocol.
3	pcg	1.12	Copyright (C) 2003-2005 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	1.1	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20			*/
21
22			#include "config.h"
23
24			#if ENABLE_TCP
25
26			// tcp processing is extremely ugly, since the vpe protocol is simply
27			// designed for unreliable datagram networks. tcp is implemented by
28			// multiplexing packets over tcp. errors are completely ignored, as we
29			// rely on the higher level protocol to time out and reconnect.
30
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			void cleaner_cb (time_watcher &w); time_watcher cleaner;
64
65			tcp_si_map ()
66			: cleaner(this, &tcp_si_map::cleaner_cb)
67			{
68			cleaner.start (0);
69			}
70			} tcp_si;
71
72			struct tcp_connection : io_watcher {
73			tstamp last_activity;
74			const sockinfo si;
75			vpn &v;
76			bool active; // this connection has been actively established
77	pcg	1.4	enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state;
78	pcg	1.1
79			vpn_packet *r_pkt;
80			u32 r_len, r_ofs;
81
82	pcg	1.3	vpn_packet *w_pkt;
83			u32 w_len, w_ofs;
84
85	pcg	1.4	#if ENABLE_HTTP_PROXY
86			char *proxy_req;
87			int proxy_req_len;
88			#endif
89
90	pcg	1.1	void tcpv4_ev (io_watcher &w, short revents);
91
92	pcg	1.2	bool send_packet (vpn_packet *pkt, int tos);
93	pcg	1.3	bool write_packet ();
94	pcg	1.1
95			void error (); // abort conenction && cleanup
96
97			operator tcp_si_map::value_type()
98			{
99			return tcp_si_map::value_type (&si, this);
100			}
101
102			tcp_connection (int fd_, const sockinfo &si_, vpn &v_);
103			~tcp_connection ();
104			};
105
106			void tcp_si_map::cleaner_cb (time_watcher &w)
107			{
108	pcg	1.11	w.start (NOW + 600);
109
110	pcg	1.1	tstamp to = NOW - ::conf.keepalive - 30 - 60;
111
112			for (iterator i = begin (); i != end(); )
113			if (i->second->last_activity >= to)
114			++i;
115			else
116			{
117			erase (i);
118			i = begin ();
119			}
120			}
121
122			void
123			vpn::tcpv4_ev (io_watcher &w, short revents)
124			{
125	pcg	1.11	if (revents & EVENT_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			sockinfo si(sa, PROT_TCPv4);
136
137			slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D
138
139			fcntl (fd, F_SETFL, O_NONBLOCK);
140
141			tcp_connection i = new tcp_connection (fd, si, this);
142			tcp_si.insert (*i);
143			}
144			}
145			}
146
147	pcg	1.2	bool
148	pcg	1.1	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
149			{
150			tcp_si_map::iterator info = tcp_si.find (&si);
151
152			tcp_connection *i;
153
154			if (info == tcp_si.end ())
155			{
156			i = new tcp_connection (-1, si, *this);
157			tcp_si.insert (*i);
158			}
159			else
160			i = info->second;
161
162	pcg	1.2	return i->send_packet (pkt, tos);
163	pcg	1.1	}
164
165	pcg	1.3	bool
166			tcp_connection::write_packet ()
167			{
168			ssize_t len;
169
170			if (w_ofs < 2)
171			{
172			u16 plen = htons (w_pkt->len);
173
174			iovec vec[2];
175	pcg	1.7	//TODO: char* is the right type? hardly...
176			vec[0].iov_base = (char )((u8 )&plen) + w_ofs;
177	pcg	1.3	vec[0].iov_len = 2 - w_ofs;
178	pcg	1.7	vec[1].iov_base = (char )&((w_pkt)[0]);
179	pcg	1.3	vec[1].iov_len = w_len - 2;
180
181			len = writev (fd, vec, 2);
182			}
183			else
184			len = write (fd, &((*w_pkt)[w_ofs - 2]), w_len);
185
186			if (len > 0)
187			{
188			w_ofs += len;
189			w_len -= len;
190
191			return w_len == 0;
192			}
193			else if (len < 0 && (errno == EAGAIN \|\| errno == EINTR))
194			return false;
195			else
196			{
197			error ();
198			return false;
199			}
200			}
201
202	pcg	1.1	void
203			tcp_connection::tcpv4_ev (io_watcher &w, short revents)
204			{
205			last_activity = NOW;
206
207	pcg	1.11	if (revents & EVENT_WRITE)
208	pcg	1.3	{
209			if (state == CONNECTING)
210			{
211			state = ESTABLISHED;
212	pcg	1.11	set (EVENT_READ);
213	pcg	1.4	#if ENABLE_HTTP_PROXY
214			if (::conf.proxy_host && ::conf.proxy_port)
215			{
216			state = CONNECTING_PROXY;
217	pcg	1.11
218			if (write (fd, proxy_req, proxy_req_len) == 0)
219			{
220			error ();
221			return;
222			}
223
224	pcg	1.4	free (proxy_req); proxy_req = 0;
225			}
226			#endif
227	pcg	1.3	}
228			else if (state == ESTABLISHED)
229			{
230			if (w_pkt)
231			{
232			if (write_packet ())
233			{
234			delete w_pkt; w_pkt = 0;
235
236	pcg	1.11	set (EVENT_READ);
237	pcg	1.3	}
238			}
239			else
240	pcg	1.11	set (EVENT_READ);
241	pcg	1.3	}
242			else
243	pcg	1.11	set (EVENT_READ);
244	pcg	1.3	}
245
246	pcg	1.11	if (revents & EVENT_READ)
247	pcg	1.1	{
248	pcg	1.4	if (state == ESTABLISHED)
249			for (;;)
250			{
251			if (!r_pkt)
252			{
253			r_pkt = new vpn_packet;
254			r_ofs = 0;
255			r_len = 2; // header
256			}
257
258			ssize_t len = read (fd, &((*r_pkt)[r_ofs < 2 ? r_ofs : r_ofs - 2]), r_len);
259
260			if (len > 0)
261			{
262			r_len -= len;
263			r_ofs += len;
264
265			if (r_len == 0)
266			{
267			if (r_ofs == 2)
268			{
269			r_len = ntohs ((u16 )&((*r_pkt)[0]));
270			r_pkt->len = r_len;
271
272			if (r_len > 0 && r_len < MAXSIZE)
273			continue;
274			}
275			else
276			{
277			v.recv_vpn_packet (r_pkt, si);
278			delete r_pkt;
279			r_pkt = 0;
280
281			continue;
282			}
283			}
284			else
285			break;
286			}
287			else if (len < 0 && (errno == EINTR \|\| errno == EAGAIN))
288			break;
289
290	pcg	1.11	// len == 0 <-> EOF
291	pcg	1.4	error ();
292			break;
293			}
294			#if ENABLE_HTTP_PROXY
295			else if (state == CONNECTING_PROXY)
296	pcg	1.1	{
297	pcg	1.4	fcntl (fd, F_SETFL, 0);
298			char r[1024];
299			int i;
300			bool emptyline = false;
301	pcg	1.1
302	pcg	1.4	// we do a blocking read of the response, to hell with it
303			for (i = 0; i < 1023; i++)
304	pcg	1.1	{
305	pcg	1.4	int l = read (fd, &r[i], 1);
306	pcg	1.1
307	pcg	1.4	if (l <= 0)
308	pcg	1.1	{
309	pcg	1.4	error ();
310			return;
311			}
312	pcg	1.1
313	pcg	1.4	if (r[i] == '\012')
314			{
315			if (emptyline)
316			break;
317	pcg	1.1	else
318	pcg	1.4	emptyline = true;
319	pcg	1.1	}
320	pcg	1.4	else if (r[i] != '\015')
321			emptyline = false;
322	pcg	1.1	}
323
324	pcg	1.4	fcntl (fd, F_SETFL, O_NONBLOCK);
325
326			if (i < 12)
327			{
328	pcg	1.6	slog (L_ERR, _("(%s): unable to do proxy-forwarding, short response"),
329	pcg	1.5	(const char *)si);
330	pcg	1.4	error ();
331			}
332			else if (r[0] != 'H' \|\| r[1] != 'T' \|\| r[2] != 'T' \|\| r[3] != 'P' \|\| r[4] != '/'
333			\|\| r[5] != '1' // http-major
334			\|\| r[9] != '2') // response
335			{
336	pcg	1.6	slog (L_ERR, _("(%s): malformed or unexpected proxy response (%.12s)"),
337	pcg	1.5	(const char *)si, r);
338	pcg	1.4	error ();
339			}
340			else
341			state = ESTABLISHED;
342	pcg	1.1	}
343	pcg	1.4	#endif
344	pcg	1.1	}
345			}
346
347	pcg	1.2	bool
348	pcg	1.1	tcp_connection::send_packet (vpn_packet *pkt, int tos)
349			{
350			last_activity = NOW;
351
352			if (state == IDLE)
353			{
354			// woaw, the first lost packet ;)
355			fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
356
357			if (fd >= 0)
358			{
359	pcg	1.4	const sockinfo *csi = &si;
360
361			#if ENABLE_HTTP_PROXY
362			sockinfo psi;
363
364			if (::conf.proxy_host && ::conf.proxy_port)
365			{
366			psi.set (::conf.proxy_host, ::conf.proxy_port, PROT_TCPv4);
367
368			if (psi.valid ())
369			{
370			csi = ψ
371
372			proxy_req_len = asprintf (&proxy_req,
373			"CONNECT %s:%d HTTP/1.0\015\012"
374			"%s%s%s" // optional proxy-auth
375			"\015\012",
376			si.ntoa (),
377			ntohs (si.port),
378			::conf.proxy_auth ? "Proxy-Authorization: Basic " : "",
379			::conf.proxy_auth ? ::conf.proxy_auth : "",
380			::conf.proxy_auth ? "\015\012" : "");
381
382			}
383			else
384			slog (L_ERR, _("unable to resolve http proxy hostname '%s', trying direct"),
385			::conf.proxy_host);
386			}
387			#endif
388
389	pcg	1.1	fcntl (fd, F_SETFL, O_NONBLOCK);
390	pcg	1.4
391			if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
392	pcg	1.1	\|\| errno == EINPROGRESS)
393			{
394			state = CONNECTING;
395	pcg	1.11	start (fd, EVENT_WRITE);
396	pcg	1.1	}
397			else
398			close (fd);
399			}
400			}
401			else if (state == ESTABLISHED)
402			{
403	pcg	1.3	// drop packet if the tcp write buffer is full. this is the
404			// right thing to do, not using tcp is the right thing to do.
405			if (!w_pkt)
406			{
407			// how this maps to the underlying tcp packets we don't know
408			// and we don't care. at least we tried ;)
409	pcg	1.7	#if defined(SOL_IP) && defined(IP_TOS)
410	pcg	1.3	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
411	pcg	1.7	#endif
412	pcg	1.3
413			w_pkt = pkt;
414			w_ofs = 0;
415			w_len = pkt->len + 2; // length + size header
416
417			if (write_packet ())
418			w_pkt = 0;
419			else
420			{
421			w_pkt = new vpn_packet;
422			w_pkt->set (*pkt);
423	pcg	1.1
424	pcg	1.11	set (EVENT_READ \| EVENT_WRITE);
425	pcg	1.3	}
426			}
427	pcg	1.1	}
428	pcg	1.2
429			return state != ERROR;
430	pcg	1.1	}
431
432	pcg	1.4	void tcp_connection::error ()
433			{
434			if (fd >= 0)
435			{
436			close (fd);
437			fd = -1;
438			}
439
440			delete r_pkt; r_pkt = 0;
441			delete w_pkt; w_pkt = 0;
442			#if ENABLE_HTTP_PROXY
443			free (proxy_req); proxy_req = 0;
444			#endif
445
446			stop ();
447			state = active ? IDLE : ERROR;
448			}
449
450	pcg	1.1	tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
451			: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev)
452			{
453			last_activity = NOW;
454			r_pkt = 0;
455	pcg	1.3	w_pkt = 0;
456	pcg	1.1	fd = fd_;
457	pcg	1.4	#if ENABLE_HTTP_PROXY
458			proxy_req = 0;
459			#endif
460	pcg	1.1
461			if (fd < 0)
462			{
463			active = true;
464			state = IDLE;
465			}
466			else
467			{
468			active = false;
469			state = ESTABLISHED;
470	pcg	1.11	start (fd, EVENT_READ);
471	pcg	1.1	}
472			}
473
474			tcp_connection::~tcp_connection ()
475			{
476			error ();
477			}
478
479			#endif
480