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>
{
  inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;

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

} tcp_si;

struct tcp_connection : ev::io
{
  int tos;
  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

  inline 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_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_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_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)
          if (tos != this->tos)
            {
              this->tos = 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);
      tos = -1;
      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_)
{
  set<tcp_connection, &tcp_connection::tcpv4_ev> (this);

  last_activity = ev_now ();
  r_pkt = 0;
  w_pkt = 0;
  tos = -1;
  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:	1.24
Committed:	Thu Dec 6 00:35:29 2007 UTC (16 years, 5 months ago) by pcg
Content type:	text/plain
Branch:	MAIN
Changes since 1.23:	+2 -2 lines
Log Message:	inline callbacks
#	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	pcg	1.22	struct tcp_si_map : public map<const sockinfo , tcp_connection , lt_sockinfo>
63			{
64	pcg	1.24	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
65	pcg	1.1
66			tcp_si_map ()
67	pcg	1.17	{
68	pcg	1.23	cleaner.set<tcp_si_map, &tcp_si_map::cleaner_cb> (this);
69	pcg	1.19	cleaner.start (::conf.keepalive / 2, ::conf.keepalive / 2);
70	pcg	1.17	}
71	pcg	1.13
72	pcg	1.1	} tcp_si;
73
74	pcg	1.22	struct tcp_connection : ev::io
75			{
76	pcg	1.21	int tos;
77	pcg	1.1	tstamp last_activity;
78			const sockinfo si;
79			vpn &v;
80			bool active; // this connection has been actively established
81	pcg	1.4	enum { ERROR, IDLE, CONNECTING, CONNECTING_PROXY, ESTABLISHED } state;
82	pcg	1.1
83			vpn_packet *r_pkt;
84			u32 r_len, r_ofs;
85
86	pcg	1.3	vpn_packet *w_pkt;
87			u32 w_len, w_ofs;
88
89	pcg	1.4	#if ENABLE_HTTP_PROXY
90			char *proxy_req;
91			int proxy_req_len;
92			#endif
93
94	pcg	1.24	inline void tcpv4_ev (ev::io &w, int revents);
95	pcg	1.1
96	pcg	1.2	bool send_packet (vpn_packet *pkt, int tos);
97	pcg	1.3	bool write_packet ();
98	pcg	1.1
99			void error (); // abort conenction && cleanup
100
101			operator tcp_si_map::value_type()
102	pcg	1.13	{
103			return tcp_si_map::value_type (&si, this);
104			}
105	pcg	1.1
106			tcp_connection (int fd_, const sockinfo &si_, vpn &v_);
107			~tcp_connection ();
108			};
109
110	pcg	1.17	void tcp_si_map::cleaner_cb (ev::timer &w, int revents)
111	pcg	1.1	{
112	pcg	1.20	tstamp to = ev_now () - ::conf.keepalive - 30 - 60;
113	pcg	1.1
114			for (iterator i = begin (); i != end(); )
115			if (i->second->last_activity >= to)
116			++i;
117			else
118			{
119	pcg	1.19	delete i->second;
120	pcg	1.1	erase (i);
121			i = begin ();
122			}
123			}
124
125			void
126	pcg	1.17	vpn::tcpv4_ev (ev::io &w, int revents)
127	pcg	1.1	{
128	pcg	1.17	if (revents & EV_READ)
129	pcg	1.1	{
130			struct sockaddr_in sa;
131			socklen_t sa_len = sizeof (sa);
132			int len;
133
134			int fd = accept (w.fd, (sockaddr *)&sa, &sa_len);
135
136			if (fd >= 0)
137			{
138	pcg	1.16	fcntl (fd, F_SETFL, O_NONBLOCK);
139			fcntl (fd, F_SETFD, FD_CLOEXEC);
140
141	pcg	1.1	sockinfo si(sa, PROT_TCPv4);
142
143			slog (L_DEBUG, _("%s: accepted tcp connection"), (const char *)si);//D
144
145			tcp_connection i = new tcp_connection (fd, si, this);
146			tcp_si.insert (*i);
147			}
148			}
149			}
150
151	pcg	1.2	bool
152	pcg	1.1	vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos)
153			{
154			tcp_si_map::iterator info = tcp_si.find (&si);
155
156			tcp_connection *i;
157
158			if (info == tcp_si.end ())
159			{
160			i = new tcp_connection (-1, si, *this);
161			tcp_si.insert (*i);
162			}
163			else
164			i = info->second;
165
166	pcg	1.2	return i->send_packet (pkt, tos);
167	pcg	1.1	}
168
169	pcg	1.3	bool
170			tcp_connection::write_packet ()
171			{
172			ssize_t len;
173
174			if (w_ofs < 2)
175			{
176			u16 plen = htons (w_pkt->len);
177
178			iovec vec[2];
179	pcg	1.7	//TODO: char* is the right type? hardly...
180			vec[0].iov_base = (char )((u8 )&plen) + w_ofs;
181	pcg	1.3	vec[0].iov_len = 2 - w_ofs;
182	pcg	1.7	vec[1].iov_base = (char )&((w_pkt)[0]);
183	pcg	1.3	vec[1].iov_len = w_len - 2;
184
185			len = writev (fd, vec, 2);
186			}
187			else
188			len = write (fd, &((*w_pkt)[w_ofs - 2]), w_len);
189
190			if (len > 0)
191			{
192			w_ofs += len;
193			w_len -= len;
194
195			return w_len == 0;
196			}
197			else if (len < 0 && (errno == EAGAIN \|\| errno == EINTR))
198			return false;
199			else
200			{
201			error ();
202			return false;
203			}
204			}
205
206	pcg	1.1	void
207	pcg	1.17	tcp_connection::tcpv4_ev (ev::io &w, int revents)
208	pcg	1.1	{
209	pcg	1.20	last_activity = ev_now ();
210	pcg	1.1
211	pcg	1.17	if (revents & EV_WRITE)
212	pcg	1.3	{
213			if (state == CONNECTING)
214			{
215			state = ESTABLISHED;
216	pcg	1.17	set (EV_READ);
217	pcg	1.4	#if ENABLE_HTTP_PROXY
218			if (::conf.proxy_host && ::conf.proxy_port)
219			{
220			state = CONNECTING_PROXY;
221	pcg	1.11
222			if (write (fd, proxy_req, proxy_req_len) == 0)
223			{
224			error ();
225			return;
226			}
227
228	pcg	1.4	free (proxy_req); proxy_req = 0;
229			}
230			#endif
231	pcg	1.3	}
232			else if (state == ESTABLISHED)
233			{
234			if (w_pkt)
235			{
236			if (write_packet ())
237			{
238			delete w_pkt; w_pkt = 0;
239
240	pcg	1.17	set (EV_READ);
241	pcg	1.3	}
242			}
243			else
244	pcg	1.17	set (EV_READ);
245	pcg	1.3	}
246			else
247	pcg	1.17	set (EV_READ);
248	pcg	1.3	}
249
250	pcg	1.17	if (revents & EV_READ)
251	pcg	1.1	{
252	pcg	1.4	if (state == ESTABLISHED)
253			for (;;)
254			{
255			if (!r_pkt)
256			{
257			r_pkt = new vpn_packet;
258			r_ofs = 0;
259			r_len = 2; // header
260			}
261
262			ssize_t len = read (fd, &((*r_pkt)[r_ofs < 2 ? r_ofs : r_ofs - 2]), r_len);
263
264			if (len > 0)
265			{
266			r_len -= len;
267			r_ofs += len;
268
269			if (r_len == 0)
270			{
271			if (r_ofs == 2)
272			{
273			r_len = ntohs ((u16 )&((*r_pkt)[0]));
274			r_pkt->len = r_len;
275
276			if (r_len > 0 && r_len < MAXSIZE)
277			continue;
278			}
279			else
280			{
281			v.recv_vpn_packet (r_pkt, si);
282			delete r_pkt;
283			r_pkt = 0;
284
285			continue;
286			}
287			}
288			else
289			break;
290			}
291			else if (len < 0 && (errno == EINTR \|\| errno == EAGAIN))
292			break;
293
294	pcg	1.11	// len == 0 <-> EOF
295	pcg	1.4	error ();
296			break;
297			}
298			#if ENABLE_HTTP_PROXY
299			else if (state == CONNECTING_PROXY)
300	pcg	1.1	{
301	pcg	1.4	fcntl (fd, F_SETFL, 0);
302			char r[1024];
303			int i;
304			bool emptyline = false;
305	pcg	1.1
306	pcg	1.4	// we do a blocking read of the response, to hell with it
307			for (i = 0; i < 1023; i++)
308	pcg	1.1	{
309	pcg	1.4	int l = read (fd, &r[i], 1);
310	pcg	1.1
311	pcg	1.4	if (l <= 0)
312	pcg	1.1	{
313	pcg	1.4	error ();
314			return;
315			}
316	pcg	1.1
317	pcg	1.4	if (r[i] == '\012')
318			{
319			if (emptyline)
320			break;
321	pcg	1.1	else
322	pcg	1.4	emptyline = true;
323	pcg	1.1	}
324	pcg	1.4	else if (r[i] != '\015')
325			emptyline = false;
326	pcg	1.1	}
327
328	pcg	1.4	fcntl (fd, F_SETFL, O_NONBLOCK);
329
330			if (i < 12)
331			{
332	pcg	1.6	slog (L_ERR, _("(%s): unable to do proxy-forwarding, short response"),
333	pcg	1.5	(const char *)si);
334	pcg	1.4	error ();
335			}
336			else if (r[0] != 'H' \|\| r[1] != 'T' \|\| r[2] != 'T' \|\| r[3] != 'P' \|\| r[4] != '/'
337			\|\| r[5] != '1' // http-major
338			\|\| r[9] != '2') // response
339			{
340	pcg	1.6	slog (L_ERR, _("(%s): malformed or unexpected proxy response (%.12s)"),
341	pcg	1.5	(const char *)si, r);
342	pcg	1.4	error ();
343			}
344			else
345			state = ESTABLISHED;
346	pcg	1.1	}
347	pcg	1.4	#endif
348	pcg	1.1	}
349			}
350
351	pcg	1.2	bool
352	pcg	1.1	tcp_connection::send_packet (vpn_packet *pkt, int tos)
353			{
354	pcg	1.20	last_activity = ev_now ();
355	pcg	1.1
356			if (state == IDLE)
357			{
358			// woaw, the first lost packet ;)
359			fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
360
361			if (fd >= 0)
362			{
363	pcg	1.4	const sockinfo *csi = &si;
364
365			#if ENABLE_HTTP_PROXY
366			sockinfo psi;
367
368			if (::conf.proxy_host && ::conf.proxy_port)
369			{
370			psi.set (::conf.proxy_host, ::conf.proxy_port, PROT_TCPv4);
371
372			if (psi.valid ())
373			{
374			csi = ψ
375
376			proxy_req_len = asprintf (&proxy_req,
377			"CONNECT %s:%d HTTP/1.0\015\012"
378			"%s%s%s" // optional proxy-auth
379			"\015\012",
380			si.ntoa (),
381			ntohs (si.port),
382			::conf.proxy_auth ? "Proxy-Authorization: Basic " : "",
383			::conf.proxy_auth ? ::conf.proxy_auth : "",
384			::conf.proxy_auth ? "\015\012" : "");
385
386			}
387			else
388			slog (L_ERR, _("unable to resolve http proxy hostname '%s', trying direct"),
389			::conf.proxy_host);
390			}
391			#endif
392
393	pcg	1.1	fcntl (fd, F_SETFL, O_NONBLOCK);
394	pcg	1.4
395			if (connect (fd, csi->sav4 (), csi->salenv4 ()) >= 0
396	pcg	1.1	\|\| errno == EINPROGRESS)
397			{
398	pcg	1.16	fcntl (fd, F_SETFL, O_NONBLOCK);
399			fcntl (fd, F_SETFD, FD_CLOEXEC);
400
401	pcg	1.1	state = CONNECTING;
402	pcg	1.17	start (fd, EV_WRITE);
403	pcg	1.1	}
404			else
405			close (fd);
406			}
407			}
408			else if (state == ESTABLISHED)
409			{
410	pcg	1.3	// drop packet if the tcp write buffer is full. this is the
411			// right thing to do, not using tcp is the right thing to do.
412			if (!w_pkt)
413			{
414			// how this maps to the underlying tcp packets we don't know
415			// and we don't care. at least we tried ;)
416	pcg	1.7	#if defined(SOL_IP) && defined(IP_TOS)
417	pcg	1.21	if (tos != this->tos)
418			{
419			this->tos = tos;
420			setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos);
421			}
422	pcg	1.7	#endif
423	pcg	1.3
424			w_pkt = pkt;
425			w_ofs = 0;
426			w_len = pkt->len + 2; // length + size header
427
428			if (write_packet ())
429			w_pkt = 0;
430			else
431			{
432			w_pkt = new vpn_packet;
433			w_pkt->set (*pkt);
434	pcg	1.1
435	pcg	1.17	set (EV_READ \| EV_WRITE);
436	pcg	1.3	}
437			}
438	pcg	1.1	}
439	pcg	1.2
440			return state != ERROR;
441	pcg	1.1	}
442
443	pcg	1.4	void tcp_connection::error ()
444			{
445	pcg	1.18	stop ();
446
447	pcg	1.4	if (fd >= 0)
448			{
449			close (fd);
450	pcg	1.21	tos = -1;
451			fd = -1;
452	pcg	1.4	}
453
454			delete r_pkt; r_pkt = 0;
455			delete w_pkt; w_pkt = 0;
456			#if ENABLE_HTTP_PROXY
457			free (proxy_req); proxy_req = 0;
458			#endif
459
460			state = active ? IDLE : ERROR;
461			}
462
463	pcg	1.1	tcp_connection::tcp_connection (int fd_, const sockinfo &si_, vpn &v_)
464	pcg	1.23	: v(v_), si(si_)
465	pcg	1.1	{
466	pcg	1.23	set<tcp_connection, &tcp_connection::tcpv4_ev> (this);
467
468	pcg	1.20	last_activity = ev_now ();
469	pcg	1.1	r_pkt = 0;
470	pcg	1.3	w_pkt = 0;
471	pcg	1.21	tos = -1;
472	pcg	1.1	fd = fd_;
473	pcg	1.4	#if ENABLE_HTTP_PROXY
474			proxy_req = 0;
475			#endif
476	pcg	1.1
477			if (fd < 0)
478			{
479			active = true;
480			state = IDLE;
481			}
482			else
483			{
484			active = false;
485			state = ESTABLISHED;
486	pcg	1.17	start (fd, EV_READ);
487	pcg	1.1	}
488			}
489
490			tcp_connection::~tcp_connection ()
491			{
492			error ();
493			}
494
495			#endif
496