… | |
… | |
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 | |
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 | |
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50 | ///////////////////////////////////////////////////////////////////////////// |
43 | ///////////////////////////////////////////////////////////////////////////// |
51 | |
44 | |
52 | const char *vpn::script_if_up () |
45 | const char *vpn::script_if_up () |
53 | { |
46 | { |
54 | // the tunnel device mtu should be the physical mtu - overhead |
47 | // the tunnel device mtu should be the physical mtu - overhead |
… | |
… | |
78 | } |
71 | } |
79 | |
72 | |
80 | int |
73 | int |
81 | vpn::setup () |
74 | vpn::setup () |
82 | { |
75 | { |
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76 | ipv4_fd = -1; |
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77 | |
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78 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
|
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79 | { |
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80 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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81 | |
|
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82 | if (ipv4_fd < 0) |
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83 | return -1; |
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84 | |
|
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85 | sockinfo si (THISNODE, PROT_IPv4); |
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86 | |
|
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87 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
|
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88 | { |
|
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89 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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90 | exit (1); |
|
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91 | } |
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92 | |
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93 | #ifdef IP_MTU_DISCOVER |
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94 | // this I really consider a linux bug. I am neither connected |
|
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95 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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96 | // fragment for me sometimes. |
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97 | { |
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98 | int oval = IP_PMTUDISC_DONT; |
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99 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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100 | } |
|
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101 | #endif |
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102 | |
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103 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
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104 | } |
|
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105 | |
83 | udpv4_fd = -1; |
106 | udpv4_fd = -1; |
84 | |
107 | |
85 | if (THISNODE->protocols & PROT_UDPv4) |
108 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
86 | { |
109 | { |
87 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
110 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
88 | |
111 | |
89 | if (udpv4_fd < 0) |
112 | if (udpv4_fd < 0) |
90 | return -1; |
113 | return -1; |
… | |
… | |
114 | #endif |
137 | #endif |
115 | |
138 | |
116 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
139 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
117 | } |
140 | } |
118 | |
141 | |
119 | ipv4_fd = -1; |
142 | tcpv4_fd = -1; |
120 | if (THISNODE->protocols & PROT_IPv4) |
|
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121 | { |
|
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122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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123 | |
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124 | if (ipv4_fd < 0) |
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125 | return -1; |
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126 | |
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127 | sockinfo si (THISNODE, PROT_IPv4); |
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128 | |
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129 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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130 | { |
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131 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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132 | exit (1); |
|
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133 | } |
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134 | |
|
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135 | #ifdef IP_MTU_DISCOVER |
|
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136 | // this I really consider a linux bug. I am neither connected |
|
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137 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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138 | // fragment for me sometimes. |
|
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139 | { |
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140 | int oval = IP_PMTUDISC_DONT; |
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141 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
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142 | } |
|
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143 | #endif |
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144 | |
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145 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
|
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146 | } |
|
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147 | |
143 | |
148 | #if ENABLE_TCP |
144 | #if ENABLE_TCP |
149 | if (THISNODE->protocols & PROT_TCPv4) |
145 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
150 | { |
146 | { |
151 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
147 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
152 | |
148 | |
153 | if (tcpv4_fd < 0) |
149 | if (tcpv4_fd < 0) |
154 | return -1; |
150 | return -1; |
… | |
… | |
191 | reconnect_all (); |
187 | reconnect_all (); |
192 | |
188 | |
193 | return 0; |
189 | return 0; |
194 | } |
190 | } |
195 | |
191 | |
196 | void |
192 | // send a vpn packet out to other hosts |
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193 | bool |
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194 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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195 | { |
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196 | switch (si.prot) |
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197 | { |
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198 | case PROT_IPv4: |
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199 | return send_ipv4_packet (pkt, si, tos); |
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200 | |
|
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201 | case PROT_UDPv4: |
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202 | return send_udpv4_packet (pkt, si, tos); |
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203 | |
|
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204 | #if ENABLE_TCP |
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205 | case PROT_TCPv4: |
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206 | return send_tcpv4_packet (pkt, si, tos); |
|
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207 | #endif |
|
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208 | |
|
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209 | default: |
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210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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211 | return false; |
|
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212 | } |
|
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213 | } |
|
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214 | |
|
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215 | bool |
197 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
198 | { |
217 | { |
199 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
200 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
201 | } |
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202 | |
220 | |
203 | void |
221 | return true; |
|
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222 | } |
|
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223 | |
|
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224 | bool |
204 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
225 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
205 | { |
226 | { |
206 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
227 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
207 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
228 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
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229 | |
|
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230 | return true; |
208 | } |
231 | } |
209 | |
232 | |
210 | void |
233 | void |
211 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
234 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
212 | { |
235 | { |
… | |
… | |
219 | if (src == 0 || src > conns.size () |
242 | if (src == 0 || src > conns.size () |
220 | || dst > conns.size () |
243 | || dst > conns.size () |
221 | || pkt->typ () >= vpn_packet::PT_MAX) |
244 | || pkt->typ () >= vpn_packet::PT_MAX) |
222 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
245 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
223 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
246 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
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247 | else if (dst > conns.size ()) |
|
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248 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
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249 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
224 | else |
250 | else |
225 | { |
251 | { |
226 | connection *c = conns[src - 1]; |
252 | connection *c = conns[src - 1]; |
227 | |
253 | |
228 | if (dst == 0 && !THISNODE->routerprio) |
254 | if (dst == 0 && !THISNODE->routerprio) |
229 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
255 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
230 | c->conf->nodename, (const char *)rsi); |
256 | c->conf->nodename, (const char *)rsi); |
231 | else if (dst != 0 && dst != THISNODE->id) |
257 | else if (dst != 0 && dst != THISNODE->id) |
232 | // FORWARDING NEEDED ;) |
258 | { |
|
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259 | if (THISNODE->routerprio) |
|
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260 | // the tos setting gets lost here. who cares. |
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261 | conns[dst - 1]->inject_vpn_packet (pkt); |
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262 | else |
233 | slog (L_WARN, |
263 | slog (L_WARN, |
234 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
264 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
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265 | c->conf->nodename, (const char *)rsi, |
235 | dst, conns[dst - 1]->conf->nodename, |
266 | conns[dst - 1]->conf->nodename); |
236 | (const char *)rsi, |
267 | } |
237 | THISNODE->id, THISNODE->nodename); |
|
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238 | else |
268 | else |
239 | c->recv_vpn_packet (pkt, rsi); |
269 | c->recv_vpn_packet (pkt, rsi); |
240 | } |
270 | } |
241 | } |
271 | } |
242 | |
272 | |
… | |
… | |
248 | vpn_packet *pkt = new vpn_packet; |
278 | vpn_packet *pkt = new vpn_packet; |
249 | struct sockaddr_in sa; |
279 | struct sockaddr_in sa; |
250 | socklen_t sa_len = sizeof (sa); |
280 | socklen_t sa_len = sizeof (sa); |
251 | int len; |
281 | int len; |
252 | |
282 | |
253 | len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
283 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
254 | |
284 | |
255 | sockinfo si(sa); |
285 | sockinfo si(sa, PROT_UDPv4); |
256 | |
286 | |
257 | if (len > 0) |
287 | if (len > 0) |
258 | { |
288 | { |
259 | pkt->len = len; |
289 | pkt->len = len; |
260 | |
290 | |
261 | recv_vpn_packet (pkt, si); |
291 | recv_vpn_packet (pkt, si); |
262 | } |
292 | } |
263 | else |
293 | else |
264 | { |
294 | { |
265 | // probably ECONNRESET or somesuch |
295 | // probably ECONNRESET or somesuch |
266 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
296 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
267 | } |
297 | } |
268 | |
298 | |
269 | delete pkt; |
299 | delete pkt; |
270 | } |
300 | } |
271 | else if (revents & POLLHUP) |
301 | else if (revents & POLLHUP) |
… | |
… | |
291 | vpn_packet *pkt = new vpn_packet; |
321 | vpn_packet *pkt = new vpn_packet; |
292 | struct sockaddr_in sa; |
322 | struct sockaddr_in sa; |
293 | socklen_t sa_len = sizeof (sa); |
323 | socklen_t sa_len = sizeof (sa); |
294 | int len; |
324 | int len; |
295 | |
325 | |
296 | len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
326 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
297 | |
327 | |
298 | sockinfo si(sa, PROT_IPv4); |
328 | sockinfo si(sa, PROT_IPv4); |
299 | |
329 | |
300 | if (len > 0) |
330 | if (len > 0) |
301 | { |
331 | { |
… | |
… | |
327 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
357 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
328 | revents); |
358 | revents); |
329 | exit (1); |
359 | exit (1); |
330 | } |
360 | } |
331 | } |
361 | } |
332 | |
|
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333 | #if ENABLE_TCP |
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334 | |
|
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335 | struct tcp_connection; |
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336 | |
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337 | struct lt_sockinfo |
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338 | { |
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339 | bool operator()(const sockinfo *a, const sockinfo *b) const |
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340 | { |
|
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341 | return *a < *b; |
|
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342 | } |
|
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343 | }; |
|
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344 | |
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345 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { |
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346 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
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347 | |
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348 | tcp_si_map () |
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349 | : cleaner(this, &tcp_si_map::cleaner_cb) |
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350 | { |
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351 | cleaner.start (0); |
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352 | } |
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353 | } tcp_si; |
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354 | |
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355 | struct tcp_connection : io_watcher { |
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356 | tstamp last_activity; |
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357 | const sockinfo si; |
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358 | vpn &v; |
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359 | bool ok; |
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360 | |
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361 | vpn_packet *r_pkt; |
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362 | u32 r_len, r_ofs; |
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363 | |
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364 | void tcpv4_ev (io_watcher &w, short revents); |
|
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365 | |
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366 | operator tcp_si_map::value_type() |
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367 | { |
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368 | return tcp_si_map::value_type (&si, this); |
|
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369 | } |
|
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370 | |
|
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371 | tcp_connection (int fd, const sockinfo &si_, vpn &v_) |
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372 | : v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev) |
|
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373 | { |
|
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374 | last_activity = NOW; |
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375 | ok = false; |
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376 | r_pkt = 0; |
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377 | start (fd, POLLOUT); |
|
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378 | } |
|
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379 | |
|
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380 | ~tcp_connection () { if (p) close (p->fd); } |
|
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381 | }; |
|
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382 | |
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383 | void tcp_si_map::cleaner_cb (time_watcher &w) |
|
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384 | { |
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385 | w.at = NOW + 600; |
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386 | tstamp to = NOW - ::conf.keepalive - 30; |
|
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387 | |
|
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388 | for (iterator i = begin (); i != end(); ) |
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389 | if (i->second->last_activity >= to) |
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390 | ++i; |
|
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391 | else |
|
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392 | { |
|
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393 | erase (i); |
|
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394 | i = begin (); |
|
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395 | } |
|
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396 | } |
|
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397 | |
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398 | void |
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399 | vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
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400 | { |
|
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401 | tcp_si_map::iterator info = tcp_si.find (&si); |
|
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402 | |
|
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403 | if (info == tcp_si.end ()) |
|
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404 | { |
|
|
405 | // woaw, the first lost packet ;) |
|
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406 | int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
|
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407 | |
|
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408 | if (fd >= 0) |
|
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409 | { |
|
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410 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
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411 | |
|
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412 | if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0 |
|
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413 | || errno == EINPROGRESS) |
|
|
414 | { |
|
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415 | tcp_connection *i = new tcp_connection (fd, si, *this); |
|
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416 | |
|
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417 | tcp_si.insert (*i); |
|
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418 | } |
|
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419 | else |
|
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420 | close (fd); |
|
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421 | } |
|
|
422 | } |
|
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423 | else |
|
|
424 | { |
|
|
425 | tcp_connection *i = info->second; |
|
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426 | |
|
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427 | i->last_activity = NOW; |
|
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428 | |
|
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429 | if (i->ok) |
|
|
430 | { |
|
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431 | setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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432 | |
|
|
433 | // we use none of the advantages of tcp |
|
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434 | write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32); |
|
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435 | } |
|
|
436 | } |
|
|
437 | |
|
|
438 | #if 0 |
|
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439 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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440 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
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441 | #endif |
|
|
442 | } |
|
|
443 | |
|
|
444 | void |
|
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445 | tcp_connection::tcpv4_ev (io_watcher &w, short revents) |
|
|
446 | { |
|
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447 | last_activity = NOW; |
|
|
448 | |
|
|
449 | if (!ok) // just established? |
|
|
450 | { |
|
|
451 | ok = true; |
|
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452 | set (POLLIN); |
|
|
453 | } |
|
|
454 | |
|
|
455 | if (revents & (POLLIN | POLLERR)) |
|
|
456 | { |
|
|
457 | u32 len; |
|
|
458 | |
|
|
459 | if (sizeof (len) == read (p->fd, &len, sizeof (len))) |
|
|
460 | { |
|
|
461 | vpn_packet *pkt = new vpn_packet; |
|
|
462 | |
|
|
463 | if (len == read (p->fd, &((*pkt)[0]), len)) |
|
|
464 | { |
|
|
465 | pkt->len = len; |
|
|
466 | |
|
|
467 | v.recv_vpn_packet (pkt, si); |
|
|
468 | return; |
|
|
469 | } |
|
|
470 | |
|
|
471 | delete pkt; |
|
|
472 | } |
|
|
473 | |
|
|
474 | tcp_si.erase (&si); |
|
|
475 | |
|
|
476 | set (0);//D |
|
|
477 | } |
|
|
478 | } |
|
|
479 | |
|
|
480 | void |
|
|
481 | vpn::tcpv4_ev (io_watcher &w, short revents) |
|
|
482 | { |
|
|
483 | if (revents & (POLLIN | POLLERR)) |
|
|
484 | { |
|
|
485 | struct sockaddr_in sa; |
|
|
486 | socklen_t sa_len = sizeof (sa); |
|
|
487 | int len; |
|
|
488 | |
|
|
489 | int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len); |
|
|
490 | |
|
|
491 | if (fd >= 0) |
|
|
492 | { |
|
|
493 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
494 | |
|
|
495 | sockinfo si(sa, PROT_TCPv4); |
|
|
496 | tcp_connection *i = new tcp_connection (fd, si, *this); |
|
|
497 | |
|
|
498 | slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D |
|
|
499 | |
|
|
500 | tcp_si.insert (*i); |
|
|
501 | } |
|
|
502 | } |
|
|
503 | } |
|
|
504 | |
|
|
505 | #endif |
|
|
506 | |
362 | |
507 | void |
363 | void |
508 | vpn::tap_ev (io_watcher &w, short revents) |
364 | vpn::tap_ev (io_watcher &w, short revents) |
509 | { |
365 | { |
510 | if (revents & POLLIN) |
366 | if (revents & POLLIN) |
… | |
… | |
644 | } |
500 | } |
645 | |
501 | |
646 | return router; |
502 | return router; |
647 | } |
503 | } |
648 | |
504 | |
649 | void vpn::connect_request (int id) |
505 | void vpn::send_connect_request (int id) |
650 | { |
506 | { |
651 | connection *c = find_router (); |
507 | connection *c = find_router (); |
652 | |
508 | |
653 | if (c) |
509 | if (c) |
654 | c->connect_request (id); |
510 | c->send_connect_request (id); |
655 | //else // does not work, because all others must connect to the same router |
511 | else |
656 | // // no router found, aggressively connect to all routers |
512 | // no router found, aggressively connect to all routers |
657 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
513 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
658 | // if ((*i)->conf->routerprio) |
514 | if ((*i)->conf->routerprio) |
659 | // (*i)->establish_connection (); |
515 | (*i)->establish_connection (); |
660 | } |
516 | } |
661 | |
517 | |
662 | void |
518 | void |
663 | connection::dump_status () |
519 | connection::dump_status () |
664 | { |
520 | { |