1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify it |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | under the terms of the GNU General Public License as published by the |
8 | under the terms of the GNU General Public License as published by the |
… | |
… | |
38 | #include <cstdlib> |
38 | #include <cstdlib> |
39 | |
39 | |
40 | #include <sys/types.h> |
40 | #include <sys/types.h> |
41 | #include <sys/socket.h> |
41 | #include <sys/socket.h> |
42 | #include <sys/wait.h> |
42 | #include <sys/wait.h> |
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43 | #include <sys/stat.h> |
43 | #include <errno.h> |
44 | #include <errno.h> |
44 | #include <time.h> |
45 | #include <time.h> |
45 | #include <unistd.h> |
46 | #include <unistd.h> |
46 | #include <fcntl.h> |
47 | #include <fcntl.h> |
47 | #include <sys/socket.h> |
48 | #include <sys/socket.h> |
… | |
… | |
52 | |
53 | |
53 | #include "connection.h" |
54 | #include "connection.h" |
54 | #include "util.h" |
55 | #include "util.h" |
55 | #include "vpn.h" |
56 | #include "vpn.h" |
56 | |
57 | |
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58 | using namespace std; |
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59 | |
57 | vpn network; // THE vpn (bad design...) |
60 | vpn network; // THE vpn (bad design...) |
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61 | |
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62 | ///////////////////////////////////////////////////////////////////////////// |
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63 | |
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64 | // hopefully temporary workaround for rare buffer full conditions |
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65 | // if it happens, usually instantly retrying or retrying ~5ms later |
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66 | // is good enough with current network technologies/kernels |
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67 | |
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68 | static ssize_t |
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69 | xsendto (int fd, const void *buf, size_t len, int flags, |
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70 | const struct sockaddr *sa, socklen_t salen) |
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71 | { |
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72 | ssize_t res; |
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73 | |
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74 | for (int retry = 0; retry <= 13; ++retry) // ~100ms |
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75 | { |
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76 | res = sendto (fd, buf, len, flags, sa, salen); |
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77 | |
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78 | if (res >= 0 || errno != ENOBUFS) |
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79 | break; |
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80 | |
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81 | struct timespec ts = { 0, 1000 * retry }; |
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82 | nanosleep (&ts, 0); |
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83 | } |
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84 | |
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85 | return res; |
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86 | } |
58 | |
87 | |
59 | ///////////////////////////////////////////////////////////////////////////// |
88 | ///////////////////////////////////////////////////////////////////////////// |
60 | |
89 | |
61 | static void inline |
90 | static void inline |
62 | set_tos (int fd, int &tos_prev, int tos) |
91 | set_tos (int fd, int &tos_prev, int tos) |
… | |
… | |
75 | { |
104 | { |
76 | // the tunnel device mtu should be the physical mtu - overhead |
105 | // the tunnel device mtu should be the physical mtu - overhead |
77 | // the tricky part is rounding to the cipher key blocksize |
106 | // the tricky part is rounding to the cipher key blocksize |
78 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
107 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
79 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
108 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
80 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
109 | mtu -= mtu % BLOCK_SIZE (CIPHER); // round |
81 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
110 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
82 | |
111 | |
83 | char *env; |
112 | char *env; |
84 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
113 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
85 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
114 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
… | |
… | |
110 | inline const char * |
139 | inline const char * |
111 | vpn::script_if_up () |
140 | vpn::script_if_up () |
112 | { |
141 | { |
113 | script_init_env (); |
142 | script_init_env (); |
114 | |
143 | |
115 | char *filename; |
144 | return conf.config_filename (::conf.script_if_up, "if-up"); |
116 | asprintf (&filename, |
145 | } |
117 | "%s/%s", |
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118 | confbase, |
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119 | ::conf.script_if_up ? ::conf.script_if_up : "if-up"); |
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120 | |
146 | |
121 | return filename; |
147 | int |
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148 | vpn::setup_socket (u8 prot, int family, int type, int proto) |
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149 | { |
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150 | int fd = socket (family, type, proto); |
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151 | |
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152 | if (fd < 0) |
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153 | { |
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154 | slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); |
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155 | return fd; |
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156 | } |
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157 | |
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158 | fcntl (fd, F_SETFL, O_NONBLOCK); |
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159 | fcntl (fd, F_SETFD, FD_CLOEXEC); |
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160 | |
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161 | #ifdef SO_MARK |
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162 | if (::conf.nfmark) |
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163 | if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) |
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164 | slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); |
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165 | #endif |
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166 | |
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167 | return fd; |
122 | } |
168 | } |
123 | |
169 | |
124 | int |
170 | int |
125 | vpn::setup () |
171 | vpn::setup () |
126 | { |
172 | { |
… | |
… | |
129 | ipv4_tos = -1; |
175 | ipv4_tos = -1; |
130 | ipv4_fd = -1; |
176 | ipv4_fd = -1; |
131 | |
177 | |
132 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
178 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
133 | { |
179 | { |
134 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
180 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
135 | |
181 | |
136 | if (ipv4_fd < 0) |
182 | if (ipv4_fd < 0) |
137 | return -1; |
183 | return -1; |
138 | |
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139 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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140 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
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141 | |
184 | |
142 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
185 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
143 | // this I really consider a linux bug. I am neither connected |
186 | // this I really consider a linux bug. I am neither connected |
144 | // nor do I fragment myself. Linux still sets DF and doesn't |
187 | // nor do I fragment myself. Linux still sets DF and doesn't |
145 | // fragment for me sometimes. |
188 | // fragment for me sometimes. |
… | |
… | |
152 | sockinfo si (THISNODE, PROT_IPv4); |
195 | sockinfo si (THISNODE, PROT_IPv4); |
153 | |
196 | |
154 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
197 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
155 | { |
198 | { |
156 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
199 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
157 | exit (EXIT_FAILURE); |
200 | return -1; |
158 | } |
201 | } |
159 | |
202 | |
160 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
203 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
161 | ++success; |
204 | ++success; |
162 | } |
205 | } |
… | |
… | |
166 | udpv4_tos = -1; |
209 | udpv4_tos = -1; |
167 | udpv4_fd = -1; |
210 | udpv4_fd = -1; |
168 | |
211 | |
169 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
212 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
170 | { |
213 | { |
171 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
214 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
172 | |
215 | |
173 | if (udpv4_fd < 0) |
216 | if (udpv4_fd < 0) |
174 | return -1; |
217 | return -1; |
175 | |
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176 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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177 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
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178 | |
218 | |
179 | // standard daemon practise... |
219 | // standard daemon practise... |
180 | { |
220 | { |
181 | int oval = 1; |
221 | int oval = 1; |
182 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
222 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
195 | sockinfo si (THISNODE, PROT_UDPv4); |
235 | sockinfo si (THISNODE, PROT_UDPv4); |
196 | |
236 | |
197 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
237 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
198 | { |
238 | { |
199 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
239 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
200 | exit (EXIT_FAILURE); |
240 | return -1; |
201 | } |
241 | } |
202 | |
242 | |
203 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
243 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
204 | ++success; |
244 | ++success; |
205 | } |
245 | } |
… | |
… | |
210 | icmpv4_fd = -1; |
250 | icmpv4_fd = -1; |
211 | |
251 | |
212 | #if ENABLE_ICMP |
252 | #if ENABLE_ICMP |
213 | if (THISNODE->protocols & PROT_ICMPv4) |
253 | if (THISNODE->protocols & PROT_ICMPv4) |
214 | { |
254 | { |
215 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
255 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
216 | |
256 | |
217 | if (icmpv4_fd < 0) |
257 | if (icmpv4_fd < 0) |
218 | return -1; |
258 | return -1; |
219 | |
259 | |
220 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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221 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
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222 | |
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223 | #ifdef ICMP_FILTER |
260 | #ifdef ICMP_FILTER |
224 | { |
261 | { |
225 | icmp_filter oval; |
262 | icmp_filter oval; |
226 | oval.data = 0xffffffff; |
263 | oval.data = 0; |
227 | if (::conf.icmp_type < 32) |
264 | if (::conf.icmp_type < 32) |
228 | oval.data &= ~(1 << ::conf.icmp_type); |
265 | oval.data |= 1 << ::conf.icmp_type; |
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266 | oval.data = ~oval.data; |
229 | |
267 | |
230 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
268 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
231 | } |
269 | } |
232 | #endif |
270 | #endif |
233 | |
271 | |
… | |
… | |
244 | sockinfo si (THISNODE, PROT_ICMPv4); |
282 | sockinfo si (THISNODE, PROT_ICMPv4); |
245 | |
283 | |
246 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
284 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
247 | { |
285 | { |
248 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
286 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
249 | exit (EXIT_FAILURE); |
287 | return -1; |
250 | } |
288 | } |
251 | |
289 | |
252 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
290 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
253 | ++success; |
291 | ++success; |
254 | } |
292 | } |
… | |
… | |
257 | tcpv4_fd = -1; |
295 | tcpv4_fd = -1; |
258 | |
296 | |
259 | #if ENABLE_TCP |
297 | #if ENABLE_TCP |
260 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
298 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
261 | { |
299 | { |
262 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
300 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
263 | |
301 | |
264 | if (tcpv4_fd < 0) |
302 | if (tcpv4_fd < 0) |
265 | return -1; |
303 | return -1; |
266 | |
304 | |
267 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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268 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
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269 | |
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270 | // standard daemon practise... |
305 | // standard daemon practise... |
271 | { |
306 | { |
272 | int oval = 1; |
307 | int oval = 1; |
273 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
308 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
274 | } |
309 | } |
… | |
… | |
276 | sockinfo si (THISNODE, PROT_TCPv4); |
311 | sockinfo si (THISNODE, PROT_TCPv4); |
277 | |
312 | |
278 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
313 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
279 | { |
314 | { |
280 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
315 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
281 | exit (EXIT_FAILURE); |
316 | return -1; |
282 | } |
317 | } |
283 | |
318 | |
284 | if (listen (tcpv4_fd, 5)) |
319 | if (listen (tcpv4_fd, 5)) |
285 | { |
320 | { |
286 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
321 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
287 | exit (EXIT_FAILURE); |
322 | return -1; |
288 | } |
323 | } |
289 | |
324 | |
290 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
325 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
291 | ++success; |
326 | ++success; |
292 | } |
327 | } |
… | |
… | |
300 | #if ENABLE_DNS |
335 | #if ENABLE_DNS |
301 | if (THISNODE->protocols & PROT_DNSv4) |
336 | if (THISNODE->protocols & PROT_DNSv4) |
302 | { |
337 | { |
303 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
338 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
304 | |
339 | |
305 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
340 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
306 | |
341 | |
307 | if (dnsv4_fd < 0) |
342 | if (dnsv4_fd < 0) |
308 | return -1; |
343 | return -1; |
309 | |
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310 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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311 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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312 | |
344 | |
313 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
345 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
314 | // this I really consider a linux bug. I am neither connected |
346 | // this I really consider a linux bug. I am neither connected |
315 | // nor do I fragment myself. Linux still sets DF and doesn't |
347 | // nor do I fragment myself. Linux still sets DF and doesn't |
316 | // fragment for me sometimes. |
348 | // fragment for me sometimes. |
… | |
… | |
331 | PROT_DNSv4); |
363 | PROT_DNSv4); |
332 | |
364 | |
333 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
365 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
334 | { |
366 | { |
335 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
367 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
336 | exit (EXIT_FAILURE); |
368 | return -1; |
337 | } |
369 | } |
338 | |
370 | |
339 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
371 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
340 | ++success; |
372 | ++success; |
341 | } |
373 | } |
… | |
… | |
343 | |
375 | |
344 | ///////////////////////////////////////////////////////////////////////////// |
376 | ///////////////////////////////////////////////////////////////////////////// |
345 | |
377 | |
346 | if (!success) |
378 | if (!success) |
347 | { |
379 | { |
348 | slog (L_ERR, _("no protocols enabled, exiting.")); |
380 | slog (L_ERR, _("no protocols enabled.")); |
349 | exit (EXIT_FAILURE); |
381 | return -1; |
350 | } |
382 | } |
351 | |
383 | |
352 | reconnect_all (); |
384 | reconnect_all (); |
353 | |
385 | |
354 | ///////////////////////////////////////////////////////////////////////////// |
386 | ///////////////////////////////////////////////////////////////////////////// |
355 | |
387 | |
356 | tap = new tap_device (); |
388 | tap = new tap_device (); |
357 | if (!tap) //D this, of course, never catches |
389 | if (!tap) //D this, of course, never catches |
358 | { |
390 | { |
359 | slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname); |
391 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
360 | exit (EXIT_FAILURE); |
392 | return -1; |
361 | } |
393 | } |
362 | |
394 | |
363 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
395 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
364 | |
396 | |
365 | run_script_cb cb; |
397 | run_script_cb cb; |
366 | cb.set<vpn, &vpn::script_if_init> (this); |
398 | cb.set<vpn, &vpn::script_if_init> (this); |
367 | |
399 | |
368 | if (tap->if_up () && |
400 | if (tap->if_up () && |
369 | !run_script (cb, true)) |
401 | !run_script (cb, true)) |
370 | { |
402 | { |
371 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
403 | slog (L_ERR, _("interface initialization command '%s' failed."), |
372 | tap->if_up ()); |
404 | tap->if_up ()); |
373 | exit (EXIT_FAILURE); |
405 | return -1; |
374 | } |
406 | } |
375 | |
407 | |
376 | cb.set<vpn, &vpn::script_if_up> (this); |
408 | cb.set<vpn, &vpn::script_if_up> (this); |
377 | if (!run_script (cb, true)) |
409 | if (!run_script (cb, true)) |
378 | { |
410 | { |
379 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
411 | slog (L_ERR, _("if-up command execution failed.")); |
380 | exit (EXIT_FAILURE); |
412 | return -1; |
381 | } |
413 | } |
382 | |
414 | |
383 | tap_ev_watcher.start (tap->fd, EV_READ); |
415 | tap_ev_watcher.start (tap->fd, EV_READ); |
384 | |
416 | |
385 | return 0; |
417 | return 0; |
|
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418 | } |
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419 | |
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420 | bool |
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421 | vpn::drop_privileges () |
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422 | { |
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423 | if (::conf.change_root) |
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424 | { |
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425 | if (!strcmp (::conf.change_root, "/")) |
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426 | { |
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427 | char dir [L_tmpnam]; |
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428 | if (!tmpnam (dir)) |
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429 | { |
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430 | slog (L_CRIT, _("unable to create anonymous root path.")); |
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431 | return false; |
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432 | } |
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433 | |
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434 | if (mkdir (dir, 0700)) |
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435 | { |
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436 | slog (L_CRIT, _("unable to create anonymous root directory.")); |
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437 | return false; |
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438 | } |
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439 | |
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440 | if (chdir (dir)) |
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441 | { |
|
|
442 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
|
|
443 | return false; |
|
|
444 | } |
|
|
445 | |
|
|
446 | if (rmdir (dir)) |
|
|
447 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
|
|
448 | } |
|
|
449 | else |
|
|
450 | { |
|
|
451 | if (chdir (::conf.change_root)) |
|
|
452 | { |
|
|
453 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
|
|
454 | return false; |
|
|
455 | } |
|
|
456 | } |
|
|
457 | |
|
|
458 | if (chroot (".")) |
|
|
459 | { |
|
|
460 | slog (L_CRIT, _("unable to set new root directory.")); |
|
|
461 | return false; |
|
|
462 | } |
|
|
463 | |
|
|
464 | if (chdir ("/")) |
|
|
465 | { |
|
|
466 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
|
|
467 | return false; |
|
|
468 | } |
|
|
469 | } |
|
|
470 | |
|
|
471 | if (::conf.change_gid) |
|
|
472 | if (setgid (::conf.change_gid)) |
|
|
473 | { |
|
|
474 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
|
|
475 | return false; |
|
|
476 | } |
|
|
477 | |
|
|
478 | if (::conf.change_uid) |
|
|
479 | if (setuid (::conf.change_uid)) |
|
|
480 | { |
|
|
481 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
|
|
482 | return false; |
|
|
483 | } |
|
|
484 | |
|
|
485 | return true; |
386 | } |
486 | } |
387 | |
487 | |
388 | bool |
488 | bool |
389 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
489 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
390 | { |
490 | { |
391 | set_tos (ipv4_fd, ipv4_tos, tos); |
491 | set_tos (ipv4_fd, ipv4_tos, tos); |
392 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
492 | xsendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
393 | |
493 | |
394 | return true; |
494 | return true; |
395 | } |
495 | } |
396 | |
496 | |
397 | static u16 |
497 | static u16 |
… | |
… | |
428 | hdr->code = 255; |
528 | hdr->code = 255; |
429 | hdr->checksum = 0; |
529 | hdr->checksum = 0; |
430 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
530 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
431 | |
531 | |
432 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
532 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
433 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
533 | xsendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
434 | |
534 | |
435 | return true; |
535 | return true; |
436 | } |
536 | } |
437 | #endif |
537 | #endif |
438 | |
538 | |
439 | bool |
539 | bool |
440 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
540 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
441 | { |
541 | { |
442 | set_tos (udpv4_fd, udpv4_tos, tos); |
542 | set_tos (udpv4_fd, udpv4_tos, tos); |
443 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
543 | xsendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
444 | |
544 | |
445 | return true; |
545 | return true; |
446 | } |
546 | } |
447 | |
547 | |
448 | void |
548 | void |
… | |
… | |
474 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
574 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
475 | |
575 | |
476 | if (src == 0 || src > conns.size () |
576 | if (src == 0 || src > conns.size () |
477 | || dst > conns.size () |
577 | || dst > conns.size () |
478 | || pkt->typ () >= vpn_packet::PT_MAX) |
578 | || pkt->typ () >= vpn_packet::PT_MAX) |
479 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
|
|
480 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
481 | else if (dst > conns.size ()) |
|
|
482 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
579 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
483 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
580 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
484 | else |
581 | else |
485 | { |
582 | { |
486 | connection *c = conns[src - 1]; |
583 | connection *c = conns[src - 1]; |
… | |
… | |
508 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
605 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
509 | { |
606 | { |
510 | switch (si.prot) |
607 | switch (si.prot) |
511 | { |
608 | { |
512 | case PROT_IPv4: |
609 | case PROT_IPv4: |
513 | return send_ipv4_packet (pkt, si, tos); |
610 | return send_ipv4_packet (pkt, si, tos); |
514 | |
611 | |
515 | case PROT_UDPv4: |
612 | case PROT_UDPv4: |
516 | return send_udpv4_packet (pkt, si, tos); |
613 | return send_udpv4_packet (pkt, si, tos); |
517 | |
614 | |
518 | #if ENABLE_TCP |
615 | #if ENABLE_TCP |
519 | case PROT_TCPv4: |
616 | case PROT_TCPv4: |
520 | return send_tcpv4_packet (pkt, si, tos); |
617 | return send_tcpv4_packet (pkt, si, tos); |
521 | #endif |
618 | #endif |
522 | #if ENABLE_ICMP |
619 | #if ENABLE_ICMP |
523 | case PROT_ICMPv4: |
620 | case PROT_ICMPv4: |
524 | return send_icmpv4_packet (pkt, si, tos); |
621 | return send_icmpv4_packet (pkt, si, tos); |
525 | #endif |
622 | #endif |
526 | #if ENABLE_DNS |
623 | #if ENABLE_DNS |
527 | case PROT_DNSv4: |
624 | case PROT_DNSv4: |
528 | return send_dnsv4_packet (pkt, si, tos); |
625 | return send_dnsv4_packet (pkt, si, tos); |
529 | #endif |
626 | #endif |
530 | default: |
627 | default: |
531 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
628 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
532 | } |
629 | } |
533 | |
630 | |
… | |
… | |
551 | if (len > 0) |
648 | if (len > 0) |
552 | { |
649 | { |
553 | pkt->len = len; |
650 | pkt->len = len; |
554 | |
651 | |
555 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
652 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
556 | pkt->skip_hdr (IP_OVERHEAD); |
653 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
557 | |
654 | |
558 | recv_vpn_packet (pkt, si); |
655 | recv_vpn_packet (pkt, si); |
559 | } |
656 | } |
560 | else |
657 | else |
561 | { |
658 | { |
… | |
… | |
598 | if (hdr->type == ::conf.icmp_type |
695 | if (hdr->type == ::conf.icmp_type |
599 | && hdr->code == 255) |
696 | && hdr->code == 255) |
600 | { |
697 | { |
601 | // raw sockets deliver the ipv4, but don't expect it on sends |
698 | // raw sockets deliver the ipv4, but don't expect it on sends |
602 | // this is slow, but... |
699 | // this is slow, but... |
603 | pkt->skip_hdr (ICMP_OVERHEAD); |
700 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
604 | |
701 | |
605 | recv_vpn_packet (pkt, si); |
702 | recv_vpn_packet (pkt, si); |
606 | } |
703 | } |
607 | } |
704 | } |
608 | else |
705 | else |
… | |
… | |
750 | |
847 | |
751 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
848 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
752 | (*c)->establish_connection (); |
849 | (*c)->establish_connection (); |
753 | } |
850 | } |
754 | |
851 | |
|
|
852 | bool |
755 | bool vpn::can_direct (conf_node *src, conf_node *dst) const |
853 | vpn::can_direct (conf_node *src, conf_node *dst) const |
756 | { |
854 | { |
757 | return src != dst |
855 | return src != dst |
758 | && src->may_direct (dst) |
856 | && src->may_direct (dst) |
759 | && dst->may_direct (src) |
857 | && dst->may_direct (src) |
760 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
858 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
761 | || (src->protocols & dst->connectable_protocols ())); |
859 | || (src->protocols & dst->connectable_protocols ())); |
762 | } |
860 | } |
763 | |
861 | |
764 | // only works for indirect and routed connections: find a router |
862 | // only works for indirect and routed connections: find a router |
765 | // from THISNODE to dst |
863 | // from THISNODE to dst |
|
|
864 | connection * |
766 | connection *vpn::find_router_for (const connection *dst) |
865 | vpn::find_router_for (const connection *dst) |
767 | { |
866 | { |
768 | connection *router = 0; |
867 | connection *router = 0; |
769 | |
868 | |
770 | // first try to find a router with a direct connection |
869 | // first try to find a router with a direct connection, route there |
|
|
870 | // regardless of any other considerations. |
771 | { |
871 | { |
772 | u32 prio = 1; |
872 | u32 prio = 1; |
773 | |
873 | |
774 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
874 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
775 | { |
875 | { |
776 | connection *c = *i; |
876 | connection *c = *i; |
777 | |
877 | |
778 | if (c->conf->routerprio > prio |
878 | if (c->conf->routerprio > prio |
779 | && c->conf != THISNODE |
879 | && c->conf != THISNODE |
780 | && c != dst |
|
|
781 | && can_direct (c->conf, dst->conf)) |
880 | && can_direct (c->conf, dst->conf) |
|
|
881 | && c->ictx && c->octx) |
782 | { |
882 | { |
783 | if (c->ictx && c->octx) |
|
|
784 | { |
|
|
785 | prio = c->conf->routerprio; |
883 | prio = c->conf->routerprio; |
786 | router = c; |
884 | router = c; |
787 | } |
|
|
788 | else |
|
|
789 | c->establish_connection (); |
|
|
790 | } |
885 | } |
791 | } |
886 | } |
792 | } |
887 | } |
793 | |
888 | |
794 | if (router) |
889 | if (router) |
795 | return router; |
890 | return router; |
796 | |
891 | |
797 | // second try find the router with the highest priority higher than ours |
892 | // second try find the router with the highest priority, higher than ours |
798 | { |
893 | { |
799 | u32 prio = 1; |
894 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
800 | |
895 | |
801 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
896 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
802 | { |
897 | { |
803 | connection *c = *i; |
898 | connection *c = *i; |
804 | |
899 | |
805 | if (c->conf->routerprio > prio |
900 | if (c->conf->routerprio > prio |
806 | && c->conf->routerprio > THISNODE->routerprio |
|
|
807 | && c != dst |
901 | && c != dst |
808 | && c->conf != THISNODE) |
902 | && c->conf != THISNODE |
|
|
903 | && c->ictx && c->octx) |
809 | { |
904 | { |
810 | if (c->ictx && c->octx) |
|
|
811 | { |
|
|
812 | prio = c->conf->routerprio; |
905 | prio = c->conf->routerprio; |
813 | router = c; |
906 | router = c; |
814 | } |
|
|
815 | else |
|
|
816 | c->establish_connection (); |
|
|
817 | } |
907 | } |
818 | } |
908 | } |
819 | } |
909 | } |
|
|
910 | |
820 | return router; |
911 | return router; |
821 | } |
912 | } |
822 | |
913 | |
|
|
914 | void |
823 | void vpn::connection_established (connection *c) |
915 | vpn::connection_established (connection *c) |
824 | { |
916 | { |
825 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
917 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
826 | { |
918 | { |
827 | connection *o = *i; |
919 | connection *o = *i; |
828 | |
920 | |
829 | if (!o->is_direct |
|
|
830 | && o->si.valid () |
921 | if (o->si.valid () |
831 | && c->si != o->si |
922 | && c->si != o->si |
832 | && c == find_router_for (o)) |
923 | && c == find_router_for (o) |
|
|
924 | && !can_direct (THISNODE, o->conf)) |
833 | { |
925 | { |
834 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
926 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
835 | o->conf->nodename, c->conf->nodename); |
927 | o->conf->nodename, c->conf->nodename); |
836 | o->rekey (); |
928 | o->rekey (); |
837 | } |
929 | } |
838 | } |
930 | } |
839 | } |
931 | } |
840 | |
932 | |
|
|
933 | void |
841 | void vpn::send_connect_request (connection *c) |
934 | vpn::send_connect_request (connection *c) |
842 | { |
935 | { |
843 | connection *r = find_router_for (c); |
936 | connection *r = find_router_for (c); |
844 | |
937 | |
845 | if (r) |
938 | if (r) |
846 | { |
939 | { |
847 | slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."), |
940 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
848 | c->conf->nodename, r->conf->nodename); |
941 | c->conf->nodename, r->conf->nodename); |
849 | r->send_connect_request (c->conf->id); |
942 | r->send_connect_request (c->conf->id); |
850 | } |
943 | } |
851 | else |
944 | else |
852 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), |
945 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
853 | c->conf->nodename); |
946 | c->conf->nodename); |
854 | } |
947 | } |
855 | |
948 | |
856 | void |
949 | void |
857 | connection::dump_status () |
950 | connection::dump_status () |