… | |
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38 | |
38 | |
39 | #include "connection.h" |
39 | #include "connection.h" |
40 | #include "util.h" |
40 | #include "util.h" |
41 | #include "vpn.h" |
41 | #include "vpn.h" |
42 | |
42 | |
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43 | #if ENABLE_TCP |
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44 | # include <map> |
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45 | # include <unistd.h> |
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46 | # include <fcntl.h> |
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47 | # include <sys/poll.h> |
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48 | #endif |
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49 | |
43 | ///////////////////////////////////////////////////////////////////////////// |
50 | ///////////////////////////////////////////////////////////////////////////// |
44 | |
51 | |
45 | const char *vpn::script_if_up (int) |
52 | const char *vpn::script_if_up () |
46 | { |
53 | { |
47 | // the tunnel device mtu should be the physical mtu - overhead |
54 | // the tunnel device mtu should be the physical mtu - overhead |
48 | // the tricky part is rounding to the cipher key blocksize |
55 | // the tricky part is rounding to the cipher key blocksize |
49 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
56 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
57 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
… | |
… | |
71 | } |
78 | } |
72 | |
79 | |
73 | int |
80 | int |
74 | vpn::setup () |
81 | vpn::setup () |
75 | { |
82 | { |
76 | sockinfo si; |
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77 | |
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78 | si.set (THISNODE); |
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79 | |
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80 | udpv4_fd = -1; |
83 | udpv4_fd = -1; |
81 | |
84 | |
82 | if (THISNODE->protocols & PROT_UDPv4) |
85 | if (THISNODE->protocols & PROT_UDPv4) |
83 | { |
86 | { |
84 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
87 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
85 | |
88 | |
86 | if (udpv4_fd < 0) |
89 | if (udpv4_fd < 0) |
87 | return -1; |
90 | return -1; |
88 | |
91 | |
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92 | sockinfo si (THISNODE, PROT_UDPv4); |
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93 | |
89 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
94 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
90 | { |
95 | { |
91 | slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno)); |
96 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
92 | exit (1); |
97 | exit (1); |
93 | } |
98 | } |
94 | |
99 | |
95 | #ifdef IP_MTU_DISCOVER |
100 | #ifdef IP_MTU_DISCOVER |
96 | // this I really consider a linux bug. I am neither connected |
101 | // this I really consider a linux bug. I am neither connected |
… | |
… | |
117 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
118 | |
123 | |
119 | if (ipv4_fd < 0) |
124 | if (ipv4_fd < 0) |
120 | return -1; |
125 | return -1; |
121 | |
126 | |
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127 | sockinfo si (THISNODE, PROT_IPv4); |
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128 | |
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
129 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
123 | { |
130 | { |
124 | slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno)); |
131 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
125 | exit (1); |
132 | exit (1); |
126 | } |
133 | } |
127 | |
134 | |
128 | #ifdef IP_MTU_DISCOVER |
135 | #ifdef IP_MTU_DISCOVER |
129 | // this I really consider a linux bug. I am neither connected |
136 | // this I really consider a linux bug. I am neither connected |
… | |
… | |
135 | } |
142 | } |
136 | #endif |
143 | #endif |
137 | |
144 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
145 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
139 | } |
146 | } |
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147 | |
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148 | #if ENABLE_TCP |
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149 | if (THISNODE->protocols & PROT_TCPv4) |
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150 | { |
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151 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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152 | |
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153 | if (tcpv4_fd < 0) |
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154 | return -1; |
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155 | |
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156 | sockinfo si (THISNODE, PROT_TCPv4); |
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157 | |
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158 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
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159 | { |
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160 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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161 | exit (1); |
|
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162 | } |
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163 | |
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164 | if (listen (tcpv4_fd, 5)) |
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165 | { |
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166 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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167 | exit (1); |
|
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168 | } |
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169 | |
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170 | // standard daemon practise... |
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171 | { |
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172 | int oval = 1; |
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173 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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174 | } |
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175 | |
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176 | tcpv4_accept_watcher.start (tcpv4_fd, POLLIN); |
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177 | } |
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178 | #endif |
140 | |
179 | |
141 | tap = new tap_device (); |
180 | tap = new tap_device (); |
142 | if (!tap) //D this, of course, never catches |
181 | if (!tap) //D this, of course, never catches |
143 | { |
182 | { |
144 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
183 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
… | |
… | |
200 | c->recv_vpn_packet (pkt, rsi); |
239 | c->recv_vpn_packet (pkt, rsi); |
201 | } |
240 | } |
202 | } |
241 | } |
203 | |
242 | |
204 | void |
243 | void |
205 | vpn::udpv4_ev (short revents) |
244 | vpn::udpv4_ev (int fd, short revents) |
206 | { |
245 | { |
207 | if (revents & (POLLIN | POLLERR)) |
246 | if (revents & (POLLIN | POLLERR)) |
208 | { |
247 | { |
209 | vpn_packet *pkt = new vpn_packet; |
248 | vpn_packet *pkt = new vpn_packet; |
210 | struct sockaddr_in sa; |
249 | struct sockaddr_in sa; |
211 | socklen_t sa_len = sizeof (sa); |
250 | socklen_t sa_len = sizeof (sa); |
212 | int len; |
251 | int len; |
213 | |
252 | |
214 | len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
253 | len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
215 | |
254 | |
216 | sockinfo si(sa); |
255 | sockinfo si(sa); |
217 | |
256 | |
218 | if (len > 0) |
257 | if (len > 0) |
219 | { |
258 | { |
… | |
… | |
243 | exit (1); |
282 | exit (1); |
244 | } |
283 | } |
245 | } |
284 | } |
246 | |
285 | |
247 | void |
286 | void |
248 | vpn::ipv4_ev (short revents) |
287 | vpn::ipv4_ev (int fd, short revents) |
249 | { |
288 | { |
250 | if (revents & (POLLIN | POLLERR)) |
289 | if (revents & (POLLIN | POLLERR)) |
251 | { |
290 | { |
252 | vpn_packet *pkt = new vpn_packet; |
291 | vpn_packet *pkt = new vpn_packet; |
253 | struct sockaddr_in sa; |
292 | struct sockaddr_in sa; |
254 | socklen_t sa_len = sizeof (sa); |
293 | socklen_t sa_len = sizeof (sa); |
255 | int len; |
294 | int len; |
256 | |
295 | |
257 | len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
296 | len = recvfrom (fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
258 | |
297 | |
259 | sockinfo si(sa, PROT_IPv4); |
298 | sockinfo si(sa, PROT_IPv4); |
260 | |
299 | |
261 | if (len > 0) |
300 | if (len > 0) |
262 | { |
301 | { |
… | |
… | |
289 | revents); |
328 | revents); |
290 | exit (1); |
329 | exit (1); |
291 | } |
330 | } |
292 | } |
331 | } |
293 | |
332 | |
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333 | #if ENABLE_TCP |
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334 | |
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335 | struct tcp_info { |
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336 | int fd; |
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337 | bool ok; |
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338 | io_watcher r; |
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339 | |
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340 | tcp_info (vpn *v) |
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341 | : r(v, &vpn::tcpv4_ev) |
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342 | { |
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343 | fd = -1; |
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344 | } |
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345 | |
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346 | ~tcp_info () { close (fd); } |
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347 | }; |
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348 | |
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349 | typedef map<sockinfo, tcp_info *> tcp_si_map; |
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350 | typedef map<int, tcp_info *> tcp_fd_map; // unneecssary if iom would be cooler |
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351 | static tcp_si_map tcp_si; |
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352 | static tcp_fd_map tcp_fd; |
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353 | |
294 | void |
354 | void |
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355 | vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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356 | { |
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357 | tcp_si_map::iterator info = tcp_si.find (si); |
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358 | |
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359 | if (info == tcp_si.end ()) |
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360 | { |
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361 | // woaw, the first lost packet ;) |
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362 | tcp_info *i = new tcp_info (this); |
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363 | |
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364 | i->ok = false; |
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365 | i->fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
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366 | |
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367 | if (i->fd >= 0) |
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368 | { |
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369 | fcntl (i->fd, F_SETFL, O_NONBLOCK); |
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370 | |
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371 | if (connect (i->fd, si.sav4 (), si.salenv4 ()) >= 0 |
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372 | || errno == EINPROGRESS) |
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373 | { |
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374 | tcp_si.insert (tcp_si_map::value_type (si, i)); |
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375 | tcp_fd.insert (tcp_fd_map::value_type (i->fd, i)); |
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376 | return; |
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377 | } |
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378 | |
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379 | delete i; |
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380 | } |
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381 | } |
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382 | else |
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383 | { |
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384 | tcp_info *i = info->second; |
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385 | |
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386 | if (i->ok) |
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387 | { |
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388 | setsockopt (i->fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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389 | |
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390 | if (write (i->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32)) |
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391 | { |
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392 | // error, close socket, forget it and retry immediately |
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393 | tcp_si.erase (info); |
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394 | tcp_fd.erase (i->fd); |
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395 | delete i; |
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396 | |
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397 | // tail recursion is... better than goto(?) |
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398 | send_tcpv4_packet (pkt, si, tos); |
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399 | } |
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400 | } |
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401 | } |
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402 | |
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403 | #if 0 |
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404 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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405 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
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406 | #endif |
|
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407 | } |
|
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408 | |
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409 | void |
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410 | vpn::tcpv4_accept (int fd, short revents) |
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411 | { |
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412 | if (revents & (POLLIN | POLLERR)) |
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413 | { |
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414 | struct sockaddr_in sa; |
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415 | socklen_t sa_len = sizeof (sa); |
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416 | int len; |
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417 | |
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418 | fd = accept (fd, (sockaddr *)&sa, &sa_len); |
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419 | |
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420 | if (fd >= 0) |
|
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421 | { |
|
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422 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
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423 | |
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424 | sockinfo si(sa, PROT_TCPv4); |
|
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425 | tcp_info *i = new tcp_info (this); |
|
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426 | |
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427 | i->fd = fd; |
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428 | i->ok = true; |
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429 | i->r.start (fd, POLLIN); |
|
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430 | |
|
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431 | tcp_si.insert (tcp_si_map::value_type (si, i)); |
|
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432 | tcp_fd.insert (tcp_fd_map::value_type (fd, i)); |
|
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433 | } |
|
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434 | } |
|
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435 | } |
|
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436 | |
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437 | void |
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438 | vpn::tcpv4_ev (int fd, short revents) |
|
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439 | { |
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440 | if (revents & (POLLIN | POLLERR)) |
|
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441 | { |
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442 | tcp_fd_map::iterator info = tcp_fd.find (fd); |
|
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443 | |
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444 | if (info != tcp_fd.end ()) |
|
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445 | { |
|
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446 | tcp_info *i = info->second; |
|
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447 | |
|
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448 | if (!i->ok) // not yet established |
|
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449 | { |
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450 | i->ok = true; |
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451 | fcntl (i->fd, F_SETFL, 0); |
|
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452 | } |
|
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453 | |
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454 | u32 len; |
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455 | |
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456 | if (sizeof (len) == read (fd, &len, sizeof (len))) |
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457 | { |
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458 | slog (L_ERR, "%d bytes received\n", len); |
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459 | } |
|
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460 | |
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461 | //tcp_si.erase (i); |
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462 | tcp_fd.erase (fd); |
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463 | delete i; |
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464 | } |
|
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465 | } |
|
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466 | } |
|
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467 | |
|
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468 | #endif |
|
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469 | |
|
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470 | void |
295 | vpn::tap_ev (short revents) |
471 | vpn::tap_ev (int fd, short revents) |
296 | { |
472 | { |
297 | if (revents & POLLIN) |
473 | if (revents & POLLIN) |
298 | { |
474 | { |
299 | /* process data */ |
475 | /* process data */ |
300 | tap_packet *pkt; |
476 | tap_packet *pkt; |
… | |
… | |
468 | |
644 | |
469 | slog (L_NOTICE, _("END status dump")); |
645 | slog (L_NOTICE, _("END status dump")); |
470 | } |
646 | } |
471 | |
647 | |
472 | vpn::vpn (void) |
648 | vpn::vpn (void) |
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649 | : event(this, &vpn::event_cb) |
473 | : udpv4_ev_watcher(this, &vpn::udpv4_ev) |
650 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
474 | , ipv4_ev_watcher(this, &vpn::ipv4_ev) |
651 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
475 | , tap_ev_watcher(this, &vpn::tap_ev) |
652 | , tap_ev_watcher (this, &vpn::tap_ev) |
476 | , event(this, &vpn::event_cb) |
653 | #if ENABLE_TCP |
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654 | , tcpv4_accept_watcher(this, &vpn::tcpv4_accept) |
|
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655 | #endif |
477 | { |
656 | { |
478 | } |
657 | } |
479 | |
658 | |
480 | vpn::~vpn () |
659 | vpn::~vpn () |
481 | { |
660 | { |