1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | 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 | 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 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
18 | |
19 | |
19 | #include "config.h" |
20 | #include "config.h" |
20 | |
21 | |
21 | #include <list> |
22 | #include <list> |
22 | |
23 | |
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24 | #include <cstdio> |
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25 | #include <cstring> |
23 | #include <cstdlib> |
26 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
27 | |
27 | #include <sys/types.h> |
28 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
29 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
30 | #include <sys/wait.h> |
31 | #include <errno.h> |
31 | #include <errno.h> |
32 | #include <time.h> |
32 | #include <time.h> |
33 | #include <unistd.h> |
33 | #include <unistd.h> |
34 | #include <fcntl.h> |
34 | #include <fcntl.h> |
35 | #include <arpa/inet.h> |
35 | #include <sys/socket.h> |
36 | #include <netinet/in.h> |
36 | |
37 | #include <netinet/ip_icmp.h> |
37 | #include "netcompat.h" |
38 | |
38 | |
39 | #include "pidfile.h" |
39 | #include "pidfile.h" |
40 | |
40 | |
41 | #include "connection.h" |
41 | #include "connection.h" |
42 | #include "util.h" |
42 | #include "util.h" |
43 | #include "vpn.h" |
43 | #include "vpn.h" |
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44 | |
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45 | vpn network; // THE vpn (bad design...) |
44 | |
46 | |
45 | ///////////////////////////////////////////////////////////////////////////// |
47 | ///////////////////////////////////////////////////////////////////////////// |
46 | |
48 | |
47 | const char *vpn::script_if_up () |
49 | const char *vpn::script_if_up () |
48 | { |
50 | { |
… | |
… | |
52 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
53 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
54 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
55 | |
57 | |
56 | char *env; |
58 | char *env; |
57 | asprintf (&env, "CONFBASE=%s", confbase); |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
58 | putenv (env); |
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59 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
60 | putenv (env); |
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61 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
62 | putenv (env); |
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63 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
64 | putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
65 | asprintf (&env, "MTU=%d", mtu); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
66 | putenv (env); |
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67 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
68 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
69 | THISNODE->id & 0xff); |
68 | THISNODE->id & 0xff); |
70 | putenv (env); |
69 | putenv (env); |
71 | |
70 | |
… | |
… | |
84 | if (ipv4_fd < 0) |
83 | if (ipv4_fd < 0) |
85 | return -1; |
84 | return -1; |
86 | |
85 | |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
86 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
88 | |
87 | |
89 | #ifdef IP_MTU_DISCOVER |
88 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
90 | // this I really consider a linux bug. I am neither connected |
89 | // this I really consider a linux bug. I am neither connected |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
90 | // nor do I fragment myself. Linux still sets DF and doesn't |
92 | // fragment for me sometimes. |
91 | // fragment for me sometimes. |
93 | { |
92 | { |
94 | int oval = IP_PMTUDISC_DONT; |
93 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
99 | sockinfo si (THISNODE, PROT_IPv4); |
98 | sockinfo si (THISNODE, PROT_IPv4); |
100 | |
99 | |
101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
102 | { |
101 | { |
103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
102 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
104 | exit (1); |
103 | exit (EXIT_FAILURE); |
105 | } |
104 | } |
106 | |
105 | |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
108 | } |
107 | } |
109 | |
108 | |
110 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
111 | |
110 | |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
… | |
… | |
122 | { |
121 | { |
123 | int oval = 1; |
122 | int oval = 1; |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
123 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
125 | } |
124 | } |
126 | |
125 | |
127 | #ifdef IP_MTU_DISCOVER |
126 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
128 | // this I really consider a linux bug. I am neither connected |
127 | // this I really consider a linux bug. I am neither connected |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
128 | // nor do I fragment myself. Linux still sets DF and doesn't |
130 | // fragment for me sometimes. |
129 | // fragment for me sometimes. |
131 | { |
130 | { |
132 | int oval = IP_PMTUDISC_DONT; |
131 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
137 | sockinfo si (THISNODE, PROT_UDPv4); |
136 | sockinfo si (THISNODE, PROT_UDPv4); |
138 | |
137 | |
139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
140 | { |
139 | { |
141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
140 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
142 | exit (1); |
141 | exit (EXIT_FAILURE); |
143 | } |
142 | } |
144 | |
143 | |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
146 | } |
145 | } |
147 | |
146 | |
148 | icmpv4_fd = -1; |
147 | icmpv4_fd = -1; |
149 | |
148 | |
150 | #if ENABLE_ICMP |
149 | #if ENABLE_ICMP |
… | |
… | |
166 | |
165 | |
167 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
166 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
168 | } |
167 | } |
169 | #endif |
168 | #endif |
170 | |
169 | |
171 | #ifdef IP_MTU_DISCOVER |
170 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
172 | // this I really consider a linux bug. I am neither connected |
171 | // this I really consider a linux bug. I am neither connected |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
172 | // nor do I fragment myself. Linux still sets DF and doesn't |
174 | // fragment for me sometimes. |
173 | // fragment for me sometimes. |
175 | { |
174 | { |
176 | int oval = IP_PMTUDISC_DONT; |
175 | int oval = IP_PMTUDISC_DONT; |
… | |
… | |
181 | sockinfo si (THISNODE, PROT_ICMPv4); |
180 | sockinfo si (THISNODE, PROT_ICMPv4); |
182 | |
181 | |
183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
184 | { |
183 | { |
185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
184 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
186 | exit (1); |
185 | exit (EXIT_FAILURE); |
187 | } |
186 | } |
188 | |
187 | |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
190 | } |
189 | } |
191 | #endif |
190 | #endif |
192 | |
191 | |
193 | tcpv4_fd = -1; |
192 | tcpv4_fd = -1; |
194 | |
193 | |
… | |
… | |
211 | sockinfo si (THISNODE, PROT_TCPv4); |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
212 | |
211 | |
213 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
214 | { |
213 | { |
215 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
214 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
216 | exit (1); |
215 | exit (EXIT_FAILURE); |
217 | } |
216 | } |
218 | |
217 | |
219 | if (listen (tcpv4_fd, 5)) |
218 | if (listen (tcpv4_fd, 5)) |
220 | { |
219 | { |
221 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
220 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
222 | exit (1); |
221 | exit (EXIT_FAILURE); |
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222 | } |
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223 | |
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224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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225 | } |
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226 | #endif |
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227 | |
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228 | #if ENABLE_DNS |
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229 | if (THISNODE->protocols & PROT_DNSv4) |
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230 | { |
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231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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232 | |
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233 | if (dnsv4_fd < 0) |
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234 | return -1; |
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235 | |
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236 | // standard daemon practise... |
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237 | { |
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238 | int oval = 1; |
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239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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240 | } |
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241 | |
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242 | sockinfo si (THISNODE, PROT_DNSv4); |
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243 | |
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244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
223 | } |
245 | { |
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246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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247 | exit (EXIT_FAILURE); |
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248 | } |
224 | |
249 | |
225 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
250 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
226 | } |
251 | } |
227 | #endif |
252 | #endif |
228 | |
253 | |
229 | tap = new tap_device (); |
254 | tap = new tap_device (); |
230 | if (!tap) //D this, of course, never catches |
255 | if (!tap) //D this, of course, never catches |
231 | { |
256 | { |
232 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
233 | exit (1); |
258 | exit (EXIT_FAILURE); |
234 | } |
259 | } |
235 | |
260 | |
236 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
237 | |
262 | |
238 | tap_ev_watcher.start (tap->fd, POLLIN); |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
239 | |
264 | |
240 | reconnect_all (); |
265 | reconnect_all (); |
241 | |
266 | |
242 | return 0; |
267 | return 0; |
243 | } |
268 | } |
… | |
… | |
262 | #if ENABLE_ICMP |
287 | #if ENABLE_ICMP |
263 | case PROT_ICMPv4: |
288 | case PROT_ICMPv4: |
264 | return send_icmpv4_packet (pkt, si, tos); |
289 | return send_icmpv4_packet (pkt, si, tos); |
265 | #endif |
290 | #endif |
266 | |
291 | |
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292 | #if ENABLE_DNS |
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293 | case PROT_DNSv4: |
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294 | return send_dnsv4_packet (pkt, si, tos); |
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295 | #endif |
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296 | |
267 | default: |
297 | default: |
268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
298 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
269 | return false; |
299 | return false; |
270 | } |
300 | } |
271 | } |
301 | } |
272 | |
302 | |
273 | bool |
303 | bool |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
304 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
275 | { |
305 | { |
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306 | #if defined(SOL_IP) && defined(IP_TOS) |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
307 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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308 | #endif |
277 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
309 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | |
310 | |
279 | return true; |
311 | return true; |
280 | } |
312 | } |
281 | |
313 | |
… | |
… | |
300 | sum += (sum >> 16); // carry |
332 | sum += (sum >> 16); // carry |
301 | |
333 | |
302 | return ~sum; |
334 | return ~sum; |
303 | } |
335 | } |
304 | |
336 | |
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337 | #if ENABLE_ICMP |
305 | bool |
338 | bool |
306 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
339 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
307 | { |
340 | { |
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341 | #if defined(SOL_IP) && defined(IP_TOS) |
308 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
342 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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343 | #endif |
309 | |
344 | |
310 | pkt->unshift_hdr (4); |
345 | pkt->unshift_hdr (4); |
311 | |
346 | |
312 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
347 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
313 | hdr->type = ::conf.icmp_type; |
348 | hdr->type = ::conf.icmp_type; |
314 | hdr->code = 255; |
349 | hdr->code = 255; |
315 | hdr->checksum = 0; |
350 | hdr->checksum = 0; |
316 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
351 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
317 | |
352 | |
318 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
353 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
319 | |
354 | |
320 | return true; |
355 | return true; |
321 | } |
356 | } |
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357 | #endif |
322 | |
358 | |
323 | bool |
359 | bool |
324 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
360 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
325 | { |
361 | { |
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362 | #if defined(SOL_IP) && defined(IP_TOS) |
326 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
363 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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364 | #endif |
327 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
365 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
328 | |
366 | |
329 | return true; |
367 | return true; |
|
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368 | } |
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369 | |
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370 | void |
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371 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
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372 | { |
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373 | if (dst) |
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374 | { |
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375 | // unicast |
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376 | if (dst != THISNODE->id) |
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377 | conns[dst - 1]->inject_data_packet (pkt); |
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378 | } |
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379 | else |
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380 | { |
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381 | // broadcast, this is ugly, but due to the security policy |
|
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382 | // we have to connect to all hosts... |
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383 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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384 | if ((*c)->conf != THISNODE) |
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385 | (*c)->inject_data_packet (pkt, true); |
|
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386 | } |
330 | } |
387 | } |
331 | |
388 | |
332 | void |
389 | void |
333 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
390 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
334 | { |
391 | { |
… | |
… | |
348 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
405 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
349 | else |
406 | else |
350 | { |
407 | { |
351 | connection *c = conns[src - 1]; |
408 | connection *c = conns[src - 1]; |
352 | |
409 | |
353 | if (dst == 0 && !THISNODE->routerprio) |
410 | if (dst == 0) |
354 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
411 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
355 | c->conf->nodename, (const char *)rsi); |
412 | c->conf->nodename, (const char *)rsi); |
356 | else if (dst != 0 && dst != THISNODE->id) |
413 | else if (dst != THISNODE->id) |
357 | { |
414 | { |
358 | if (THISNODE->routerprio) |
415 | if (THISNODE->routerprio) |
359 | // the tos setting gets lost here. who cares. |
416 | // the tos setting gets lost here. who cares. |
360 | conns[dst - 1]->inject_vpn_packet (pkt); |
417 | conns[dst - 1]->inject_vpn_packet (pkt); |
361 | else |
418 | else |
… | |
… | |
370 | } |
427 | } |
371 | |
428 | |
372 | void |
429 | void |
373 | vpn::ipv4_ev (io_watcher &w, short revents) |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
374 | { |
431 | { |
375 | if (revents & (POLLIN | POLLERR)) |
432 | if (revents & EVENT_READ) |
376 | { |
433 | { |
377 | vpn_packet *pkt = new vpn_packet; |
434 | vpn_packet *pkt = new vpn_packet; |
378 | struct sockaddr_in sa; |
435 | struct sockaddr_in sa; |
379 | socklen_t sa_len = sizeof (sa); |
436 | socklen_t sa_len = sizeof (sa); |
380 | int len; |
437 | int len; |
… | |
… | |
399 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
456 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
400 | } |
457 | } |
401 | |
458 | |
402 | delete pkt; |
459 | delete pkt; |
403 | } |
460 | } |
404 | else if (revents & POLLHUP) |
|
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405 | { |
|
|
406 | // this cannot ;) happen on udp sockets |
|
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407 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
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408 | exit (1); |
|
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409 | } |
|
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410 | else |
461 | else |
411 | { |
462 | { |
412 | slog (L_ERR, |
463 | slog (L_ERR, |
413 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
414 | revents); |
465 | revents); |
415 | exit (1); |
466 | exit (EXIT_FAILURE); |
416 | } |
467 | } |
417 | } |
468 | } |
418 | |
469 | |
|
|
470 | #if ENABLE_ICMP |
419 | void |
471 | void |
420 | vpn::icmpv4_ev (io_watcher &w, short revents) |
472 | vpn::icmpv4_ev (io_watcher &w, short revents) |
421 | { |
473 | { |
422 | if (revents & (POLLIN | POLLERR)) |
474 | if (revents & EVENT_READ) |
423 | { |
475 | { |
424 | vpn_packet *pkt = new vpn_packet; |
476 | vpn_packet *pkt = new vpn_packet; |
425 | struct sockaddr_in sa; |
477 | struct sockaddr_in sa; |
426 | socklen_t sa_len = sizeof (sa); |
478 | socklen_t sa_len = sizeof (sa); |
427 | int len; |
479 | int len; |
… | |
… | |
432 | |
484 | |
433 | if (len > 0) |
485 | if (len > 0) |
434 | { |
486 | { |
435 | pkt->len = len; |
487 | pkt->len = len; |
436 | |
488 | |
437 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
489 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
438 | |
490 | |
439 | if (hdr->type == ::conf.icmp_type |
491 | if (hdr->type == ::conf.icmp_type |
440 | && hdr->code == 255) |
492 | && hdr->code == 255) |
441 | { |
493 | { |
442 | // raw sockets deliver the ipv4, but don't expect it on sends |
494 | // raw sockets deliver the ipv4, but don't expect it on sends |
… | |
… | |
452 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
504 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
453 | } |
505 | } |
454 | |
506 | |
455 | delete pkt; |
507 | delete pkt; |
456 | } |
508 | } |
457 | else if (revents & POLLHUP) |
|
|
458 | { |
|
|
459 | // this cannot ;) happen on udp sockets |
|
|
460 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
461 | exit (1); |
|
|
462 | } |
|
|
463 | else |
509 | else |
464 | { |
510 | { |
465 | slog (L_ERR, |
511 | slog (L_ERR, |
466 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
512 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
467 | revents); |
513 | revents); |
468 | exit (1); |
514 | exit (EXIT_FAILURE); |
469 | } |
515 | } |
470 | } |
516 | } |
|
|
517 | #endif |
471 | |
518 | |
472 | void |
519 | void |
473 | vpn::udpv4_ev (io_watcher &w, short revents) |
520 | vpn::udpv4_ev (io_watcher &w, short revents) |
474 | { |
521 | { |
475 | if (revents & (POLLIN | POLLERR)) |
522 | if (revents & EVENT_READ) |
476 | { |
523 | { |
477 | vpn_packet *pkt = new vpn_packet; |
524 | vpn_packet *pkt = new vpn_packet; |
478 | struct sockaddr_in sa; |
525 | struct sockaddr_in sa; |
479 | socklen_t sa_len = sizeof (sa); |
526 | socklen_t sa_len = sizeof (sa); |
480 | int len; |
527 | int len; |
… | |
… | |
495 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
542 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
496 | } |
543 | } |
497 | |
544 | |
498 | delete pkt; |
545 | delete pkt; |
499 | } |
546 | } |
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
504 | exit (1); |
|
|
505 | } |
|
|
506 | else |
547 | else |
507 | { |
548 | { |
508 | slog (L_ERR, |
549 | slog (L_ERR, |
509 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
550 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
510 | revents); |
551 | revents); |
511 | exit (1); |
552 | exit (EXIT_FAILURE); |
512 | } |
553 | } |
513 | } |
554 | } |
514 | |
555 | |
515 | void |
556 | void |
516 | vpn::tap_ev (io_watcher &w, short revents) |
557 | vpn::tap_ev (io_watcher &w, short revents) |
517 | { |
558 | { |
518 | if (revents & POLLIN) |
559 | if (revents & EVENT_READ) |
519 | { |
560 | { |
520 | /* process data */ |
561 | /* process data */ |
521 | tap_packet *pkt; |
562 | tap_packet *pkt; |
522 | |
563 | |
523 | pkt = tap->recv (); |
564 | pkt = tap->recv (); |
524 | |
565 | |
|
|
566 | if (!pkt) |
|
|
567 | return; |
|
|
568 | |
|
|
569 | if (pkt->len > 14) |
|
|
570 | { |
525 | int dst = mac2id (pkt->dst); |
571 | int dst = mac2id (pkt->dst); |
526 | int src = mac2id (pkt->src); |
572 | int src = mac2id (pkt->src); |
527 | |
573 | |
528 | if (src != THISNODE->id) |
574 | if (src != THISNODE->id) |
529 | { |
|
|
530 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
531 | exit (1); |
|
|
532 | } |
|
|
533 | |
|
|
534 | if (dst == THISNODE->id) |
|
|
535 | { |
|
|
536 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
537 | exit (1); |
|
|
538 | } |
|
|
539 | |
|
|
540 | if (dst > conns.size ()) |
|
|
541 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
542 | else |
|
|
543 | { |
|
|
544 | if (dst) |
|
|
545 | { |
575 | { |
546 | // unicast |
576 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
547 | if (dst != THISNODE->id) |
577 | exit (EXIT_FAILURE); |
548 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
549 | } |
578 | } |
|
|
579 | |
|
|
580 | if (dst == THISNODE->id) |
|
|
581 | { |
|
|
582 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
583 | exit (EXIT_FAILURE); |
|
|
584 | } |
|
|
585 | |
|
|
586 | if (dst > conns.size ()) |
|
|
587 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
550 | else |
588 | else |
551 | { |
|
|
552 | // broadcast, first check router, then self, then english |
|
|
553 | connection *router = find_router (); |
|
|
554 | |
|
|
555 | if (router) |
|
|
556 | router->inject_data_packet (pkt, true); |
589 | inject_data_packet (pkt, dst); |
557 | else |
|
|
558 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
559 | if ((*c)->conf != THISNODE) |
|
|
560 | (*c)->inject_data_packet (pkt); |
|
|
561 | } |
|
|
562 | } |
590 | } |
563 | |
591 | |
564 | delete pkt; |
592 | delete pkt; |
565 | } |
|
|
566 | else if (revents & (POLLHUP | POLLERR)) |
|
|
567 | { |
|
|
568 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
569 | exit (1); |
|
|
570 | } |
593 | } |
571 | else |
594 | else |
572 | abort (); |
595 | abort (); |
573 | } |
596 | } |
574 | |
597 | |
… | |
… | |
580 | if (events & EVENT_SHUTDOWN) |
603 | if (events & EVENT_SHUTDOWN) |
581 | { |
604 | { |
582 | slog (L_INFO, _("preparing shutdown...")); |
605 | slog (L_INFO, _("preparing shutdown...")); |
583 | |
606 | |
584 | shutdown_all (); |
607 | shutdown_all (); |
585 | |
|
|
586 | remove_pid (pidfilename); |
608 | remove_pid (conf.pidfilename); |
587 | |
|
|
588 | slog (L_INFO, _("terminating")); |
609 | slog (L_INFO, _("terminating")); |
589 | |
610 | exit (EXIT_SUCCESS); |
590 | exit (0); |
|
|
591 | } |
611 | } |
592 | |
612 | |
593 | if (events & EVENT_RECONNECT) |
613 | if (events & EVENT_RECONNECT) |
594 | { |
614 | { |
595 | slog (L_INFO, _("forced reconnect")); |
615 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
597 | reconnect_all (); |
617 | reconnect_all (); |
598 | } |
618 | } |
599 | |
619 | |
600 | events = 0; |
620 | events = 0; |
601 | } |
621 | } |
602 | |
|
|
603 | w.at = TSTAMP_CANCEL; |
|
|
604 | } |
622 | } |
605 | |
623 | |
606 | void |
624 | void |
607 | vpn::shutdown_all () |
625 | vpn::shutdown_all () |
608 | { |
626 | { |
… | |
… | |
632 | } |
650 | } |
633 | } |
651 | } |
634 | |
652 | |
635 | connection *vpn::find_router () |
653 | connection *vpn::find_router () |
636 | { |
654 | { |
637 | u32 prio = 1; |
655 | u32 prio = 0; |
638 | connection *router = 0; |
656 | connection *router = 0; |
639 | |
657 | |
640 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
658 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
641 | { |
659 | { |
642 | connection *c = *i; |
660 | connection *c = *i; |
643 | |
661 | |
644 | if (c->conf->routerprio >= prio |
662 | if (c->conf->routerprio > prio |
645 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
663 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
646 | && c->ictx && c->octx |
664 | && c->ictx && c->octx |
647 | && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode |
665 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
648 | && (!THISNODE->routerprio |
|
|
649 | || c->conf->routerprio <= THISNODE->routerprio)) |
|
|
650 | { |
666 | { |
651 | prio = c->conf->routerprio; |
667 | prio = c->conf->routerprio; |
652 | router = c; |
668 | router = c; |
653 | } |
669 | } |
654 | } |
670 | } |
… | |
… | |
663 | if (c) |
679 | if (c) |
664 | c->send_connect_request (id); |
680 | c->send_connect_request (id); |
665 | else |
681 | else |
666 | // no router found, aggressively connect to all routers |
682 | // no router found, aggressively connect to all routers |
667 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
683 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
668 | if ((*i)->conf->routerprio) |
684 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
669 | (*i)->establish_connection (); |
685 | (*i)->establish_connection (); |
670 | } |
686 | } |
671 | |
687 | |
672 | void |
688 | void |
673 | connection::dump_status () |
689 | connection::dump_status () |
… | |
… | |
700 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
716 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
701 | #endif |
717 | #endif |
702 | #if ENABLE_ICMP |
718 | #if ENABLE_ICMP |
703 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
719 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
704 | #endif |
720 | #endif |
|
|
721 | #if ENABLE_DNS |
|
|
722 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
723 | #endif |
705 | , tap_ev_watcher (this, &vpn::tap_ev) |
724 | , tap_ev_watcher (this, &vpn::tap_ev) |
706 | { |
725 | { |
707 | } |
726 | } |
708 | |
727 | |
709 | vpn::~vpn () |
728 | vpn::~vpn () |