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> |
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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) |
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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); |
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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 | { |
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173 | int success = 0; |
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174 | |
127 | ipv4_tos = -1; |
175 | ipv4_tos = -1; |
128 | ipv4_fd = -1; |
176 | ipv4_fd = -1; |
129 | |
177 | |
130 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
178 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
131 | { |
179 | { |
132 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
180 | ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); |
133 | |
181 | |
134 | if (ipv4_fd < 0) |
182 | if (ipv4_fd < 0) |
135 | return -1; |
183 | return -1; |
136 | |
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137 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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138 | fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); |
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139 | |
184 | |
140 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
185 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
141 | // this I really consider a linux bug. I am neither connected |
186 | // this I really consider a linux bug. I am neither connected |
142 | // 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 |
143 | // fragment for me sometimes. |
188 | // fragment for me sometimes. |
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149 | |
194 | |
150 | sockinfo si (THISNODE, PROT_IPv4); |
195 | sockinfo si (THISNODE, PROT_IPv4); |
151 | |
196 | |
152 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
197 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
153 | { |
198 | { |
154 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
199 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); |
155 | exit (EXIT_FAILURE); |
200 | return -1; |
156 | } |
201 | } |
157 | |
202 | |
158 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
203 | ipv4_ev_watcher.start (ipv4_fd, EV_READ); |
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204 | ++success; |
159 | } |
205 | } |
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206 | else |
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207 | THISNODE->protocols &= ~PROT_IPv4; |
160 | |
208 | |
161 | udpv4_tos = -1; |
209 | udpv4_tos = -1; |
162 | udpv4_fd = -1; |
210 | udpv4_fd = -1; |
163 | |
211 | |
164 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
212 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
165 | { |
213 | { |
166 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
214 | udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
167 | |
215 | |
168 | if (udpv4_fd < 0) |
216 | if (udpv4_fd < 0) |
169 | return -1; |
217 | return -1; |
170 | |
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171 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
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172 | fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); |
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173 | |
218 | |
174 | // standard daemon practise... |
219 | // standard daemon practise... |
175 | { |
220 | { |
176 | int oval = 1; |
221 | int oval = 1; |
177 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
222 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
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189 | |
234 | |
190 | sockinfo si (THISNODE, PROT_UDPv4); |
235 | sockinfo si (THISNODE, PROT_UDPv4); |
191 | |
236 | |
192 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
237 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
193 | { |
238 | { |
194 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
239 | slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
195 | exit (EXIT_FAILURE); |
240 | return -1; |
196 | } |
241 | } |
197 | |
242 | |
198 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
243 | udpv4_ev_watcher.start (udpv4_fd, EV_READ); |
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244 | ++success; |
199 | } |
245 | } |
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246 | else |
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247 | THISNODE->protocols &= ~PROT_UDPv4; |
200 | |
248 | |
201 | icmpv4_tos = -1; |
249 | icmpv4_tos = -1; |
202 | icmpv4_fd = -1; |
250 | icmpv4_fd = -1; |
203 | |
251 | |
204 | #if ENABLE_ICMP |
252 | #if ENABLE_ICMP |
205 | if (THISNODE->protocols & PROT_ICMPv4) |
253 | if (THISNODE->protocols & PROT_ICMPv4) |
206 | { |
254 | { |
207 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
255 | icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); |
208 | |
256 | |
209 | if (icmpv4_fd < 0) |
257 | if (icmpv4_fd < 0) |
210 | return -1; |
258 | return -1; |
211 | |
259 | |
212 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
260 | // no clue where trhis is actually defined |
213 | fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); |
261 | #if !defined(ICMP_FILTER) && defined(__linux) |
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262 | #define ICMP_FILTER 1 |
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263 | #endif |
214 | |
264 | |
215 | #ifdef ICMP_FILTER |
265 | #ifdef ICMP_FILTER |
216 | { |
266 | { |
217 | icmp_filter oval; |
267 | uint32_t oval; |
218 | oval.data = 0xffffffff; |
268 | oval = 0; |
219 | if (::conf.icmp_type < 32) |
269 | if (::conf.icmp_type < 32) |
220 | oval.data &= ~(1 << ::conf.icmp_type); |
270 | oval |= 1 << ::conf.icmp_type; |
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271 | oval = ~oval; |
221 | |
272 | |
222 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
273 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
223 | } |
274 | } |
224 | #endif |
275 | #endif |
225 | |
276 | |
… | |
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235 | |
286 | |
236 | sockinfo si (THISNODE, PROT_ICMPv4); |
287 | sockinfo si (THISNODE, PROT_ICMPv4); |
237 | |
288 | |
238 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
289 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
239 | { |
290 | { |
240 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
291 | slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
241 | exit (EXIT_FAILURE); |
292 | return -1; |
242 | } |
293 | } |
243 | |
294 | |
244 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
295 | icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); |
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296 | ++success; |
245 | } |
297 | } |
246 | #endif |
298 | #endif |
247 | |
299 | |
248 | tcpv4_fd = -1; |
300 | tcpv4_fd = -1; |
249 | |
301 | |
250 | #if ENABLE_TCP |
302 | #if ENABLE_TCP |
251 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
303 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
252 | { |
304 | { |
253 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
305 | tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); |
254 | |
306 | |
255 | if (tcpv4_fd < 0) |
307 | if (tcpv4_fd < 0) |
256 | return -1; |
308 | return -1; |
257 | |
309 | |
258 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
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259 | fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); |
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260 | |
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261 | // standard daemon practise... |
310 | // standard daemon practise... |
262 | { |
311 | { |
263 | int oval = 1; |
312 | int oval = 1; |
264 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
313 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
265 | } |
314 | } |
266 | |
315 | |
267 | sockinfo si (THISNODE, PROT_TCPv4); |
316 | sockinfo si (THISNODE, PROT_TCPv4); |
268 | |
317 | |
269 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
318 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
270 | { |
319 | { |
271 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
320 | slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
272 | exit (EXIT_FAILURE); |
321 | return -1; |
273 | } |
322 | } |
274 | |
323 | |
275 | if (listen (tcpv4_fd, 5)) |
324 | if (listen (tcpv4_fd, 5)) |
276 | { |
325 | { |
277 | slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
326 | slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
278 | exit (EXIT_FAILURE); |
327 | return -1; |
279 | } |
328 | } |
280 | |
329 | |
281 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
330 | tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); |
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331 | ++success; |
282 | } |
332 | } |
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333 | else |
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334 | THISNODE->protocols &= ~PROT_TCPv4; |
283 | #endif |
335 | #endif |
284 | |
336 | |
285 | dnsv4_tos = -1; |
337 | dnsv4_tos = -1; |
286 | dnsv4_fd = -1; |
338 | dnsv4_fd = -1; |
287 | |
339 | |
288 | #if ENABLE_DNS |
340 | #if ENABLE_DNS |
289 | if (THISNODE->protocols & PROT_DNSv4) |
341 | if (THISNODE->protocols & PROT_DNSv4) |
290 | { |
342 | { |
291 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
343 | dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); |
292 | |
344 | |
293 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
345 | dnsv4_fd = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
294 | |
346 | |
295 | if (dnsv4_fd < 0) |
347 | if (dnsv4_fd < 0) |
296 | return -1; |
348 | return -1; |
297 | |
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298 | fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); |
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299 | fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); |
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300 | |
349 | |
301 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
350 | # if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
302 | // this I really consider a linux bug. I am neither connected |
351 | // this I really consider a linux bug. I am neither connected |
303 | // nor do I fragment myself. Linux still sets DF and doesn't |
352 | // nor do I fragment myself. Linux still sets DF and doesn't |
304 | // fragment for me sometimes. |
353 | // fragment for me sometimes. |
… | |
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318 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
367 | THISNODE->dns_hostname ? THISNODE->dns_port : 0, |
319 | PROT_DNSv4); |
368 | PROT_DNSv4); |
320 | |
369 | |
321 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
370 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
322 | { |
371 | { |
323 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
372 | slog (L_ERR, _("can't bind dnsv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); |
324 | exit (EXIT_FAILURE); |
373 | return -1; |
325 | } |
374 | } |
326 | |
375 | |
327 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
376 | dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); |
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377 | ++success; |
328 | } |
378 | } |
329 | #endif |
379 | #endif |
330 | |
380 | |
331 | ///////////////////////////////////////////////////////////////////////////// |
381 | ///////////////////////////////////////////////////////////////////////////// |
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382 | |
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383 | if (!success) |
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384 | { |
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385 | slog (L_ERR, _("no protocols enabled.")); |
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386 | return -1; |
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387 | } |
332 | |
388 | |
333 | reconnect_all (); |
389 | reconnect_all (); |
334 | |
390 | |
335 | ///////////////////////////////////////////////////////////////////////////// |
391 | ///////////////////////////////////////////////////////////////////////////// |
336 | |
392 | |
337 | tap = new tap_device (); |
393 | tap = new tap_device (); |
338 | if (!tap) //D this, of course, never catches |
394 | if (!tap) //D this, of course, never catches |
339 | { |
395 | { |
340 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
396 | slog (L_ERR, _("cannot create network interface '%s'."), conf.ifname); |
341 | exit (EXIT_FAILURE); |
397 | return -1; |
342 | } |
398 | } |
343 | |
399 | |
344 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
400 | fcntl (tap->fd, F_SETFD, FD_CLOEXEC); |
345 | |
401 | |
346 | run_script_cb cb; |
402 | run_script_cb cb; |
347 | cb.set<vpn, &vpn::script_if_init> (this); |
403 | cb.set<vpn, &vpn::script_if_init> (this); |
348 | |
404 | |
349 | if (tap->if_up () && |
405 | if (tap->if_up () && |
350 | !run_script (cb, true)) |
406 | !run_script (cb, true)) |
351 | { |
407 | { |
352 | slog (L_ERR, _("interface initialization command '%s' failed, exiting."), |
408 | slog (L_ERR, _("interface initialization command '%s' failed."), |
353 | tap->if_up ()); |
409 | tap->if_up ()); |
354 | exit (EXIT_FAILURE); |
410 | return -1; |
355 | } |
411 | } |
356 | |
412 | |
357 | cb.set<vpn, &vpn::script_if_up> (this); |
413 | cb.set<vpn, &vpn::script_if_up> (this); |
358 | if (!run_script (cb, true)) |
414 | if (!run_script (cb, true)) |
359 | { |
415 | { |
360 | slog (L_ERR, _("if-up command execution failed, exiting.")); |
416 | slog (L_ERR, _("if-up command execution failed.")); |
361 | exit (EXIT_FAILURE); |
417 | return -1; |
362 | } |
418 | } |
363 | |
419 | |
364 | tap_ev_watcher.start (tap->fd, EV_READ); |
420 | tap_ev_watcher.start (tap->fd, EV_READ); |
365 | |
421 | |
366 | return 0; |
422 | return 0; |
|
|
423 | } |
|
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424 | |
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425 | bool |
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426 | vpn::drop_privileges () |
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427 | { |
|
|
428 | if (::conf.change_root) |
|
|
429 | { |
|
|
430 | if (!strcmp (::conf.change_root, "/")) |
|
|
431 | { |
|
|
432 | char dir [L_tmpnam]; |
|
|
433 | if (!tmpnam (dir)) |
|
|
434 | { |
|
|
435 | slog (L_CRIT, _("unable to create anonymous root path.")); |
|
|
436 | return false; |
|
|
437 | } |
|
|
438 | |
|
|
439 | if (mkdir (dir, 0700)) |
|
|
440 | { |
|
|
441 | slog (L_CRIT, _("unable to create anonymous root directory.")); |
|
|
442 | return false; |
|
|
443 | } |
|
|
444 | |
|
|
445 | if (chdir (dir)) |
|
|
446 | { |
|
|
447 | slog (L_CRIT, _("unable to change to anonymous root directory.")); |
|
|
448 | return false; |
|
|
449 | } |
|
|
450 | |
|
|
451 | if (rmdir (dir)) |
|
|
452 | slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); |
|
|
453 | } |
|
|
454 | else |
|
|
455 | { |
|
|
456 | if (chdir (::conf.change_root)) |
|
|
457 | { |
|
|
458 | slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); |
|
|
459 | return false; |
|
|
460 | } |
|
|
461 | } |
|
|
462 | |
|
|
463 | if (chroot (".")) |
|
|
464 | { |
|
|
465 | slog (L_CRIT, _("unable to set new root directory.")); |
|
|
466 | return false; |
|
|
467 | } |
|
|
468 | |
|
|
469 | if (chdir ("/")) |
|
|
470 | { |
|
|
471 | slog (L_CRIT, _("unable to set cwd to new root directory.")); |
|
|
472 | return false; |
|
|
473 | } |
|
|
474 | } |
|
|
475 | |
|
|
476 | if (::conf.change_gid) |
|
|
477 | if (setgid (::conf.change_gid)) |
|
|
478 | { |
|
|
479 | slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); |
|
|
480 | return false; |
|
|
481 | } |
|
|
482 | |
|
|
483 | if (::conf.change_uid) |
|
|
484 | if (setuid (::conf.change_uid)) |
|
|
485 | { |
|
|
486 | slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); |
|
|
487 | return false; |
|
|
488 | } |
|
|
489 | |
|
|
490 | return true; |
367 | } |
491 | } |
368 | |
492 | |
369 | bool |
493 | bool |
370 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
494 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
371 | { |
495 | { |
372 | set_tos (ipv4_fd, ipv4_tos, tos); |
496 | set_tos (ipv4_fd, ipv4_tos, tos); |
373 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
497 | xsendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
374 | |
498 | |
375 | return true; |
499 | return true; |
376 | } |
500 | } |
377 | |
501 | |
378 | static u16 |
502 | static u16 |
… | |
… | |
409 | hdr->code = 255; |
533 | hdr->code = 255; |
410 | hdr->checksum = 0; |
534 | hdr->checksum = 0; |
411 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
535 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
412 | |
536 | |
413 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
537 | set_tos (icmpv4_fd, icmpv4_tos, tos); |
414 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
538 | xsendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
415 | |
539 | |
416 | return true; |
540 | return true; |
417 | } |
541 | } |
418 | #endif |
542 | #endif |
419 | |
543 | |
420 | bool |
544 | bool |
421 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
545 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
422 | { |
546 | { |
423 | set_tos (udpv4_fd, udpv4_tos, tos); |
547 | set_tos (udpv4_fd, udpv4_tos, tos); |
424 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
548 | xsendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
425 | |
549 | |
426 | return true; |
550 | return true; |
427 | } |
551 | } |
428 | |
552 | |
429 | void |
553 | void |
… | |
… | |
449 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
573 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
450 | { |
574 | { |
451 | unsigned int src = pkt->src (); |
575 | unsigned int src = pkt->src (); |
452 | unsigned int dst = pkt->dst (); |
576 | unsigned int dst = pkt->dst (); |
453 | |
577 | |
454 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
578 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d."), |
455 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
579 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
456 | |
580 | |
457 | if (src == 0 || src > conns.size () |
581 | if (src == 0 || src > conns.size () |
458 | || dst > conns.size () |
582 | || dst > conns.size () |
459 | || pkt->typ () >= vpn_packet::PT_MAX) |
583 | || pkt->typ () >= vpn_packet::PT_MAX) |
460 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
584 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), |
461 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
462 | else if (dst > conns.size ()) |
|
|
463 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
464 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
585 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
465 | else |
586 | else |
466 | { |
587 | { |
467 | connection *c = conns[src - 1]; |
588 | connection *c = conns[src - 1]; |
468 | |
589 | |
469 | if (dst == 0) |
590 | if (dst == 0) |
470 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
591 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), |
471 | c->conf->nodename, (const char *)rsi); |
592 | c->conf->nodename, (const char *)rsi); |
472 | else if (dst != THISNODE->id) |
593 | else if (dst != THISNODE->id) |
473 | { |
594 | { |
474 | if (THISNODE->routerprio) |
595 | if (THISNODE->routerprio) |
475 | // the tos setting gets lost here. who cares. |
596 | // the tos setting gets lost here. who cares. |
476 | conns[dst - 1]->inject_vpn_packet (pkt); |
597 | conns[dst - 1]->inject_vpn_packet (pkt); |
477 | else |
598 | else |
478 | slog (L_WARN, |
599 | slog (L_WARN, |
479 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
600 | _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), |
480 | c->conf->nodename, (const char *)rsi, |
601 | c->conf->nodename, (const char *)rsi, |
481 | conns[dst - 1]->conf->nodename); |
602 | conns[dst - 1]->conf->nodename); |
482 | } |
603 | } |
483 | else |
604 | else |
484 | c->recv_vpn_packet (pkt, rsi); |
605 | c->recv_vpn_packet (pkt, rsi); |
… | |
… | |
489 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
610 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
490 | { |
611 | { |
491 | switch (si.prot) |
612 | switch (si.prot) |
492 | { |
613 | { |
493 | case PROT_IPv4: |
614 | case PROT_IPv4: |
494 | return send_ipv4_packet (pkt, si, tos); |
615 | return send_ipv4_packet (pkt, si, tos); |
495 | |
616 | |
496 | case PROT_UDPv4: |
617 | case PROT_UDPv4: |
497 | return send_udpv4_packet (pkt, si, tos); |
618 | return send_udpv4_packet (pkt, si, tos); |
498 | |
619 | |
499 | #if ENABLE_TCP |
620 | #if ENABLE_TCP |
500 | case PROT_TCPv4: |
621 | case PROT_TCPv4: |
501 | return send_tcpv4_packet (pkt, si, tos); |
622 | return send_tcpv4_packet (pkt, si, tos); |
502 | #endif |
623 | #endif |
503 | #if ENABLE_ICMP |
624 | #if ENABLE_ICMP |
504 | case PROT_ICMPv4: |
625 | case PROT_ICMPv4: |
505 | return send_icmpv4_packet (pkt, si, tos); |
626 | return send_icmpv4_packet (pkt, si, tos); |
506 | #endif |
627 | #endif |
507 | #if ENABLE_DNS |
628 | #if ENABLE_DNS |
508 | case PROT_DNSv4: |
629 | case PROT_DNSv4: |
509 | return send_dnsv4_packet (pkt, si, tos); |
630 | return send_dnsv4_packet (pkt, si, tos); |
510 | #endif |
631 | #endif |
511 | default: |
632 | default: |
512 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
633 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol."), (const char *)si); |
513 | } |
634 | } |
514 | |
635 | |
515 | return false; |
636 | return false; |
516 | } |
637 | } |
517 | |
638 | |
… | |
… | |
532 | if (len > 0) |
653 | if (len > 0) |
533 | { |
654 | { |
534 | pkt->len = len; |
655 | pkt->len = len; |
535 | |
656 | |
536 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
657 | // raw sockets deliver the ipv4 header, but don't expect it on sends |
537 | pkt->skip_hdr (IP_OVERHEAD); |
658 | pkt->skip_hdr (pkt->ipv4_hdr_len ()); |
538 | |
659 | |
539 | recv_vpn_packet (pkt, si); |
660 | recv_vpn_packet (pkt, si); |
540 | } |
661 | } |
541 | else |
662 | else |
542 | { |
663 | { |
543 | // probably ECONNRESET or somesuch |
664 | // probably ECONNRESET or somesuch |
544 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
665 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
545 | } |
666 | } |
546 | |
667 | |
547 | delete pkt; |
668 | delete pkt; |
548 | } |
669 | } |
549 | else |
670 | else |
550 | { |
671 | { |
551 | slog (L_ERR, |
672 | slog (L_ERR, |
552 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
673 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
553 | revents); |
674 | revents); |
554 | exit (EXIT_FAILURE); |
675 | exit (EXIT_FAILURE); |
555 | } |
676 | } |
556 | } |
677 | } |
557 | |
678 | |
… | |
… | |
579 | if (hdr->type == ::conf.icmp_type |
700 | if (hdr->type == ::conf.icmp_type |
580 | && hdr->code == 255) |
701 | && hdr->code == 255) |
581 | { |
702 | { |
582 | // raw sockets deliver the ipv4, but don't expect it on sends |
703 | // raw sockets deliver the ipv4, but don't expect it on sends |
583 | // this is slow, but... |
704 | // this is slow, but... |
584 | pkt->skip_hdr (ICMP_OVERHEAD); |
705 | pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); |
585 | |
706 | |
586 | recv_vpn_packet (pkt, si); |
707 | recv_vpn_packet (pkt, si); |
587 | } |
708 | } |
588 | } |
709 | } |
589 | else |
710 | else |
590 | { |
711 | { |
591 | // probably ECONNRESET or somesuch |
712 | // probably ECONNRESET or somesuch |
592 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
713 | slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); |
593 | } |
714 | } |
594 | |
715 | |
595 | delete pkt; |
716 | delete pkt; |
596 | } |
717 | } |
597 | else |
718 | else |
598 | { |
719 | { |
599 | slog (L_ERR, |
720 | slog (L_ERR, |
600 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
721 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
601 | revents); |
722 | revents); |
602 | exit (EXIT_FAILURE); |
723 | exit (EXIT_FAILURE); |
603 | } |
724 | } |
604 | } |
725 | } |
605 | #endif |
726 | #endif |
… | |
… | |
625 | recv_vpn_packet (pkt, si); |
746 | recv_vpn_packet (pkt, si); |
626 | } |
747 | } |
627 | else |
748 | else |
628 | { |
749 | { |
629 | // probably ECONNRESET or somesuch |
750 | // probably ECONNRESET or somesuch |
630 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
751 | slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); |
631 | } |
752 | } |
632 | |
753 | |
633 | delete pkt; |
754 | delete pkt; |
634 | } |
755 | } |
635 | else |
756 | else |
636 | { |
757 | { |
637 | slog (L_ERR, |
758 | slog (L_ERR, |
638 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
759 | _("FATAL: unknown revents %08x in socket, exiting.\n"), |
639 | revents); |
760 | revents); |
640 | exit (EXIT_FAILURE); |
761 | exit (EXIT_FAILURE); |
641 | } |
762 | } |
642 | } |
763 | } |
643 | |
764 | |
… | |
… | |
692 | { |
813 | { |
693 | slog (L_INFO, _("preparing shutdown...")); |
814 | slog (L_INFO, _("preparing shutdown...")); |
694 | |
815 | |
695 | shutdown_all (); |
816 | shutdown_all (); |
696 | remove_pid (conf.pidfilename); |
817 | remove_pid (conf.pidfilename); |
697 | slog (L_INFO, _("terminating")); |
818 | slog (L_INFO, _("exiting.")); |
698 | exit (EXIT_SUCCESS); |
819 | exit (EXIT_SUCCESS); |
699 | } |
820 | } |
700 | |
821 | |
701 | if (events & EVENT_RECONNECT) |
822 | if (events & EVENT_RECONNECT) |
702 | { |
823 | { |
703 | slog (L_INFO, _("forced reconnect")); |
824 | slog (L_INFO, _("forced reconnect.")); |
704 | |
825 | |
705 | reconnect_all (); |
826 | reconnect_all (); |
706 | } |
827 | } |
707 | |
828 | |
708 | events = 0; |
829 | events = 0; |
… | |
… | |
724 | |
845 | |
725 | conns.clear (); |
846 | conns.clear (); |
726 | |
847 | |
727 | connection_init (); |
848 | connection_init (); |
728 | |
849 | |
729 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
850 | for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) |
730 | i != conf.nodes.end (); ++i) |
851 | conns.push_back (new connection (this, *i)); |
731 | { |
852 | |
732 | connection *conn = new connection (this, *i); |
853 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
733 | conns.push_back (conn); |
|
|
734 | conn->establish_connection (); |
854 | (*c)->establish_connection (); |
735 | } |
|
|
736 | } |
855 | } |
737 | |
856 | |
738 | connection *vpn::find_router () |
857 | bool |
|
|
858 | vpn::can_direct (conf_node *src, conf_node *dst) const |
739 | { |
859 | { |
740 | u32 prio = 1; |
860 | return src != dst |
|
|
861 | && src->may_direct (dst) |
|
|
862 | && dst->may_direct (src) |
|
|
863 | && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) |
|
|
864 | || (src->protocols & dst->connectable_protocols ())); |
|
|
865 | } |
|
|
866 | |
|
|
867 | // only works for indirect and routed connections: find a router |
|
|
868 | // from THISNODE to dst |
|
|
869 | connection * |
|
|
870 | vpn::find_router_for (const connection *dst) |
|
|
871 | { |
741 | connection *router = 0; |
872 | connection *router = 0; |
742 | |
873 | |
|
|
874 | // first try to find a router with a direct connection, route there |
|
|
875 | // regardless of any other considerations. |
|
|
876 | { |
|
|
877 | u32 prio = 1; |
|
|
878 | |
|
|
879 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
880 | { |
|
|
881 | connection *c = *i; |
|
|
882 | |
|
|
883 | if (c->conf->routerprio > prio |
|
|
884 | && c->conf != THISNODE |
|
|
885 | && can_direct (c->conf, dst->conf) |
|
|
886 | && c->ictx && c->octx) |
|
|
887 | { |
|
|
888 | prio = c->conf->routerprio; |
|
|
889 | router = c; |
|
|
890 | } |
|
|
891 | } |
|
|
892 | } |
|
|
893 | |
|
|
894 | if (router) |
|
|
895 | return router; |
|
|
896 | |
|
|
897 | // second try find the router with the highest priority, higher than ours |
|
|
898 | { |
|
|
899 | u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; |
|
|
900 | |
|
|
901 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
|
|
902 | { |
|
|
903 | connection *c = *i; |
|
|
904 | |
|
|
905 | if (c->conf->routerprio > prio |
|
|
906 | && c != dst |
|
|
907 | && c->conf != THISNODE |
|
|
908 | && c->ictx && c->octx) |
|
|
909 | { |
|
|
910 | prio = c->conf->routerprio; |
|
|
911 | router = c; |
|
|
912 | } |
|
|
913 | } |
|
|
914 | } |
|
|
915 | |
|
|
916 | return router; |
|
|
917 | } |
|
|
918 | |
|
|
919 | void |
|
|
920 | vpn::connection_established (connection *c) |
|
|
921 | { |
743 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
922 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
744 | { |
923 | { |
745 | connection *c = *i; |
924 | connection *o = *i; |
746 | |
925 | |
747 | if (c->conf->routerprio > prio |
926 | if (o->si.valid () |
748 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
927 | && c->si != o->si |
749 | && c->ictx && c->octx |
928 | && c == find_router_for (o) |
750 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
929 | && !can_direct (THISNODE, o->conf)) |
751 | { |
|
|
752 | prio = c->conf->routerprio; |
|
|
753 | router = c; |
|
|
754 | } |
930 | { |
|
|
931 | slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), |
|
|
932 | o->conf->nodename, c->conf->nodename); |
|
|
933 | o->rekey (); |
|
|
934 | } |
755 | } |
935 | } |
756 | |
|
|
757 | return router; |
|
|
758 | } |
936 | } |
759 | |
937 | |
|
|
938 | void |
760 | void vpn::send_connect_request (int id) |
939 | vpn::send_connect_request (connection *c) |
761 | { |
940 | { |
762 | connection *c = find_router (); |
941 | connection *r = find_router_for (c); |
763 | |
942 | |
764 | if (c) |
943 | if (r) |
|
|
944 | { |
|
|
945 | slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), |
|
|
946 | c->conf->nodename, r->conf->nodename); |
765 | c->send_connect_request (id); |
947 | r->send_connect_request (c->conf->id); |
|
|
948 | } |
766 | else |
949 | else |
767 | // no router found, aggressively connect to all routers |
950 | slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), |
768 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
951 | c->conf->nodename); |
769 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
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|
770 | (*i)->establish_connection (); |
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|
771 | } |
952 | } |
772 | |
953 | |
773 | void |
954 | void |
774 | connection::dump_status () |
955 | connection::dump_status () |
775 | { |
956 | { |