gvpe/src/vpn_tcp.C

/*
    vpn_tcp.C -- handle the tcp part of the protocol.
 
    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
*/

#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/poll.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <sys/uio.h>
#include <arpa/inet.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>

#include <map>
#include <unistd.h>
#include <fcntl.h>
#include <sys/poll.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.at = 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 & (POLLIN | POLLERR))
    {
      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 & (POLLERR | POLLHUP))
    {
      error ();
      return;
    }

  if (revents & POLLOUT)
    {
      if (state == CONNECTING)
        {
          state = ESTABLISHED;
          set (POLLIN);
#if ENABLE_HTTP_PROXY
          if (::conf.proxy_host && ::conf.proxy_port)
            {
              state = CONNECTING_PROXY;
              write (fd, proxy_req, proxy_req_len);
              free (proxy_req); proxy_req = 0;
            }
#endif
        }
      else if (state == ESTABLISHED)
        {
          if (w_pkt)
            {
              if (write_packet ())
                {
                  delete w_pkt; w_pkt = 0;

                  set (POLLIN);
                }
            }
          else
            set (POLLIN);
        }
      else
        set (POLLIN);
    }

  if (revents & POLLIN)
    {
      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;

            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, POLLOUT);
            }
          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 (POLLIN | POLLOUT);
            }
        }
    }

  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, POLLIN);
    }
}

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

#endif

Revision:	1.7
Committed:	Tue Oct 14 03:22:09 2003 UTC (20 years, 7 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.6:	+5 -2 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
4			This program is free software; you can redistribute it and/or modify
5			it under the terms of the GNU General Public License as published by
6			the Free Software Foundation; either version 2 of the License, or
7			(at your option) any later version.
8
9			This program is distributed in the hope that it will be useful,
10			but WITHOUT ANY WARRANTY; without even the implied warranty of
11			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12			GNU General Public License for more details.
13
14			You should have received a copy of the GNU General Public License
15			along with this program; if not, write to the Free Software
16			Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17			*/
18
19			#include "config.h"
20
21			#if ENABLE_TCP
22
23			// tcp processing is extremely ugly, since the vpe protocol is simply
24			// designed for unreliable datagram networks. tcp is implemented by
25			// multiplexing packets over tcp. errors are completely ignored, as we
26			// rely on the higher level protocol to time out and reconnect.
27
28			#include <cstring>
29
30			#include <sys/types.h>
31			#include <sys/socket.h>
32			#include <sys/poll.h>
33			#include <sys/wait.h>
34			#include <netinet/in.h>
35			#include <sys/uio.h>
36			#include <arpa/inet.h>
37			#include <errno.h>
38			#include <time.h>
39			#include <unistd.h>
40
41			#include <map>
42			#include <unistd.h>
43			#include <fcntl.h>
44			#include <sys/poll.h>
45
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			w.at = NOW + 600;
109			tstamp to = NOW - ::conf.keepalive - 30 - 60;
110
111			for (iterator i = begin (); i != end(); )
112			if (i->second->last_activity >= to)
113			++i;
114			else
115			{
116			erase (i);
117			i = begin ();
118			}
119			}
120
121			void
122			vpn::tcpv4_ev (io_watcher &w, short revents)
123			{
124			if (revents & (POLLIN \| POLLERR))
125			{
126			struct sockaddr_in sa;
127			socklen_t sa_len = sizeof (sa);
128			int len;
129
130			int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);
131
132			if (fd >= 0)
133			{
134			sockinfo si(sa, PROT_TCPv4);
135
136			slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D
137
138			fcntl (fd, F_SETFL, O_NONBLOCK);
139
140			tcp_connection i = new tcp_connection (fd, si, this);
141			tcp_si.insert (*i);
142			}
143			}
144			}
145
146	pcg	1.2	bool
147	pcg	1.1	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
148			{
149			tcp_si_map::iterator info = tcp_si.find (&si);
150
151			tcp_connection *i;
152
153			if (info == tcp_si.end ())
154			{
155			i = new tcp_connection (-1, si, *this);
156			tcp_si.insert (*i);
157			}
158			else
159			i = info->second;
160
161	pcg	1.2	return i->send_packet (pkt, tos);
162	pcg	1.1	}
163
164	pcg	1.3	bool
165			tcp_connection::write_packet ()
166			{
167			ssize_t len;
168
169			if (w_ofs < 2)
170			{
171			u16 plen = htons (w_pkt->len);
172
173			iovec vec[2];
174	pcg	1.7	//TODO: char* is the right type? hardly...
175			vec[0].iov_base = (char )((u8 )&plen) + w_ofs;
176	pcg	1.3	vec[0].iov_len = 2 - w_ofs;
177	pcg	1.7	vec[1].iov_base = (char )&((w_pkt)[0]);
178	pcg	1.3	vec[1].iov_len = w_len - 2;
179
180			len = writev (fd, vec, 2);
181			}
182			else
183			len = write (fd, &((*w_pkt)[w_ofs - 2]), w_len);
184
185			if (len > 0)
186			{
187			w_ofs += len;
188			w_len -= len;
189
190			return w_len == 0;
191			}
192			else if (len < 0 && (errno == EAGAIN \|\| errno == EINTR))
193			return false;
194			else
195			{
196			error ();
197			return false;
198			}
199			}
200
201	pcg	1.1	void
202			tcp_connection::tcpv4_ev (io_watcher &w, short revents)
203			{
204			last_activity = NOW;
205
206			if (revents & (POLLERR \| POLLHUP))
207			{
208	pcg	1.3	error ();
209			return;
210	pcg	1.1	}
211
212	pcg	1.3	if (revents & POLLOUT)
213			{
214			if (state == CONNECTING)
215			{
216			state = ESTABLISHED;
217			set (POLLIN);
218	pcg	1.4	#if ENABLE_HTTP_PROXY
219			if (::conf.proxy_host && ::conf.proxy_port)
220			{
221			state = CONNECTING_PROXY;
222			write (fd, proxy_req, proxy_req_len);
223			free (proxy_req); proxy_req = 0;
224			}
225			#endif
226	pcg	1.3	}
227			else if (state == ESTABLISHED)
228			{
229			if (w_pkt)
230			{
231			if (write_packet ())
232			{
233			delete w_pkt; w_pkt = 0;
234
235			set (POLLIN);
236			}
237			}
238			else
239			set (POLLIN);
240			}
241			else
242			set (POLLIN);
243			}
244
245			if (revents & POLLIN)
246	pcg	1.1	{
247	pcg	1.4	if (state == ESTABLISHED)
248			for (;;)
249			{
250			if (!r_pkt)
251			{
252			r_pkt = new vpn_packet;
253			r_ofs = 0;
254			r_len = 2; // header
255			}
256
257			ssize_t len = read (fd, &((*r_pkt)[r_ofs < 2 ? r_ofs : r_ofs - 2]), r_len);
258
259			if (len > 0)
260			{
261			r_len -= len;
262			r_ofs += len;
263
264			if (r_len == 0)
265			{
266			if (r_ofs == 2)
267			{
268			r_len = ntohs ((u16 )&((*r_pkt)[0]));
269			r_pkt->len = r_len;
270
271			if (r_len > 0 && r_len < MAXSIZE)
272			continue;
273			}
274			else
275			{
276			v.recv_vpn_packet (r_pkt, si);
277			delete r_pkt;
278			r_pkt = 0;
279
280			continue;
281			}
282			}
283			else
284			break;
285			}
286			else if (len < 0 && (errno == EINTR \|\| errno == EAGAIN))
287			break;
288
289			error ();
290			break;
291			}
292			#if ENABLE_HTTP_PROXY
293			else if (state == CONNECTING_PROXY)
294	pcg	1.1	{
295	pcg	1.4	fcntl (fd, F_SETFL, 0);
296			char r[1024];
297			int i;
298			bool emptyline = false;
299	pcg	1.1
300	pcg	1.4	// we do a blocking read of the response, to hell with it
301			for (i = 0; i < 1023; i++)
302	pcg	1.1	{
303	pcg	1.4	int l = read (fd, &r[i], 1);
304	pcg	1.1
305	pcg	1.4	if (l <= 0)
306	pcg	1.1	{
307	pcg	1.4	error ();
308			return;
309			}
310	pcg	1.1
311	pcg	1.4	if (r[i] == '\012')
312			{
313			if (emptyline)
314			break;
315	pcg	1.1	else
316	pcg	1.4	emptyline = true;
317	pcg	1.1	}
318	pcg	1.4	else if (r[i] != '\015')
319			emptyline = false;
320	pcg	1.1	}
321
322	pcg	1.4	fcntl (fd, F_SETFL, O_NONBLOCK);
323
324			if (i < 12)
325			{
326	pcg	1.6	slog (L_ERR, _("(%s): unable to do proxy-forwarding, short response"),
327	pcg	1.5	(const char *)si);
328	pcg	1.4	error ();
329			}
330			else if (r[0] != 'H' \|\| r[1] != 'T' \|\| r[2] != 'T' \|\| r[3] != 'P' \|\| r[4] != '/'
331			\|\| r[5] != '1' // http-major
332			\|\| r[9] != '2') // response
333			{
334	pcg	1.6	slog (L_ERR, _("(%s): malformed or unexpected proxy response (%.12s)"),
335	pcg	1.5	(const char *)si, r);
336	pcg	1.4	error ();
337			}
338			else
339			state = ESTABLISHED;
340	pcg	1.1	}
341	pcg	1.4	#endif
342	pcg	1.1	}
343			}
344
345	pcg	1.2	bool
346	pcg	1.1	tcp_connection::send_packet (vpn_packet *pkt, int tos)
347			{
348			last_activity = NOW;
349
350			if (state == IDLE)
351			{
352			// woaw, the first lost packet ;)
353			fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
354
355			if (fd >= 0)
356			{
357	pcg	1.4	const sockinfo *csi = &si;
358
359			#if ENABLE_HTTP_PROXY
360			sockinfo psi;
361
362			if (::conf.proxy_host && ::conf.proxy_port)
363			{
364			psi.set (::conf.proxy_host, ::conf.proxy_port, PROT_TCPv4);
365
366			if (psi.valid ())
367			{
368			csi = ψ
369
370			proxy_req_len = asprintf (&proxy_req,
371			"CONNECT %s:%d HTTP/1.0\015\012"
372			"%s%s%s" // optional proxy-auth
373			"\015\012",
374			si.ntoa (),
375			ntohs (si.port),
376			::conf.proxy_auth ? "Proxy-Authorization: Basic " : "",
377			::conf.proxy_auth ? ::conf.proxy_auth : "",
378			::conf.proxy_auth ? "\015\012" : "");
379
380			}
381			else
382			slog (L_ERR, _("unable to resolve http proxy hostname '%s', trying direct"),
383			::conf.proxy_host);
384			}
385			#endif
386
387	pcg	1.1	fcntl (fd, F_SETFL, O_NONBLOCK);
388	pcg	1.4
389			if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
390	pcg	1.1	\|\| errno == EINPROGRESS)
391			{
392			state = CONNECTING;
393			start (fd, POLLOUT);
394			}
395			else
396			close (fd);
397			}
398			}
399			else if (state == ESTABLISHED)
400			{
401	pcg	1.3	// drop packet if the tcp write buffer is full. this is the
402			// right thing to do, not using tcp is the right thing to do.
403			if (!w_pkt)
404			{
405			// how this maps to the underlying tcp packets we don't know
406			// and we don't care. at least we tried ;)
407	pcg	1.7	#if defined(SOL_IP) && defined(IP_TOS)
408	pcg	1.3	setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
409	pcg	1.7	#endif
410	pcg	1.3
411			w_pkt = pkt;
412			w_ofs = 0;
413			w_len = pkt->len + 2; // length + size header
414
415			if (write_packet ())
416			w_pkt = 0;
417			else
418			{
419			w_pkt = new vpn_packet;
420			w_pkt->set (*pkt);
421	pcg	1.1
422	pcg	1.3	set (POLLIN \| POLLOUT);
423			}
424			}
425	pcg	1.1	}
426	pcg	1.2
427			return state != ERROR;
428	pcg	1.1	}
429
430	pcg	1.4	void tcp_connection::error ()
431			{
432			if (fd >= 0)
433			{
434			close (fd);
435			fd = -1;
436			}
437
438			delete r_pkt; r_pkt = 0;
439			delete w_pkt; w_pkt = 0;
440			#if ENABLE_HTTP_PROXY
441			free (proxy_req); proxy_req = 0;
442			#endif
443
444			stop ();
445			state = active ? IDLE : ERROR;
446			}
447
448	pcg	1.1	tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
449			: v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev)
450			{
451			last_activity = NOW;
452			r_pkt = 0;
453	pcg	1.3	w_pkt = 0;
454	pcg	1.1	fd = fd_;
455	pcg	1.4	#if ENABLE_HTTP_PROXY
456			proxy_req = 0;
457			#endif
458	pcg	1.1
459			if (fd < 0)
460			{
461			active = true;
462			state = IDLE;
463			}
464			else
465			{
466			active = false;
467			state = ESTABLISHED;
468			start (fd, POLLIN);
469			}
470			}
471
472			tcp_connection::~tcp_connection ()
473			{
474			error ();
475			}
476
477			#endif
478