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. |
… | |
… | |
24 | #include <cstring> |
25 | #include <cstring> |
25 | #include <cstdio> |
26 | #include <cstdio> |
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 <netinet/in.h> |
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32 | #include <arpa/inet.h> |
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33 | #include <errno.h> |
31 | #include <errno.h> |
34 | #include <time.h> |
32 | #include <time.h> |
35 | #include <unistd.h> |
33 | #include <unistd.h> |
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34 | #include <fcntl.h> |
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35 | #include <sys/socket.h> |
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36 | |
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37 | #include "netcompat.h" |
36 | |
38 | |
37 | #include "pidfile.h" |
39 | #include "pidfile.h" |
38 | |
40 | |
39 | #include "connection.h" |
41 | #include "connection.h" |
40 | #include "util.h" |
42 | #include "util.h" |
41 | #include "vpn.h" |
43 | #include "vpn.h" |
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44 | |
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45 | vpn network; // THE vpn (bad design...) |
42 | |
46 | |
43 | ///////////////////////////////////////////////////////////////////////////// |
47 | ///////////////////////////////////////////////////////////////////////////// |
44 | |
48 | |
45 | const char *vpn::script_if_up () |
49 | const char *vpn::script_if_up () |
46 | { |
50 | { |
… | |
… | |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
54 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
55 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
56 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
53 | |
57 | |
54 | char *env; |
58 | char *env; |
55 | asprintf (&env, "CONFBASE=%s", confbase); |
59 | asprintf (&env, "CONFBASE=%s", confbase); putenv (env); |
56 | putenv (env); |
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57 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
60 | asprintf (&env, "NODENAME=%s", THISNODE->nodename); putenv (env); |
58 | putenv (env); |
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59 | asprintf (&env, "NODEID=%d", THISNODE->id); |
61 | asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); |
60 | putenv (env); |
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61 | asprintf (&env, "IFNAME=%s", tap->interface ()); |
62 | asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); |
62 | putenv (env); |
63 | asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); |
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64 | asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); |
63 | asprintf (&env, "MTU=%d", mtu); |
65 | asprintf (&env, "MTU=%d", mtu); putenv (env); |
64 | putenv (env); |
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65 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
66 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
67 | THISNODE->id & 0xff); |
68 | THISNODE->id & 0xff); |
68 | putenv (env); |
69 | putenv (env); |
69 | |
70 | |
… | |
… | |
80 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
81 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
81 | |
82 | |
82 | if (ipv4_fd < 0) |
83 | if (ipv4_fd < 0) |
83 | return -1; |
84 | return -1; |
84 | |
85 | |
85 | sockinfo si (THISNODE, PROT_IPv4); |
86 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
86 | |
87 | |
87 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
88 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
88 | { |
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89 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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90 | exit (1); |
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91 | } |
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92 | |
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93 | #ifdef IP_MTU_DISCOVER |
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94 | // this I really consider a linux bug. I am neither connected |
89 | // this I really consider a linux bug. I am neither connected |
95 | // 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 |
96 | // fragment for me sometimes. |
91 | // fragment for me sometimes. |
97 | { |
92 | { |
98 | int oval = IP_PMTUDISC_DONT; |
93 | int oval = IP_PMTUDISC_DONT; |
99 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
94 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
100 | } |
95 | } |
101 | #endif |
96 | #endif |
102 | |
97 | |
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98 | sockinfo si (THISNODE, PROT_IPv4); |
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99 | |
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100 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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101 | { |
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102 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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103 | exit (1); |
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104 | } |
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105 | |
103 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
104 | } |
107 | } |
105 | |
108 | |
106 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
107 | |
110 | |
108 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
109 | { |
112 | { |
110 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
113 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
111 | |
114 | |
112 | if (udpv4_fd < 0) |
115 | if (udpv4_fd < 0) |
113 | return -1; |
116 | return -1; |
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117 | |
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118 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
114 | |
119 | |
115 | // standard daemon practise... |
120 | // standard daemon practise... |
116 | { |
121 | { |
117 | int oval = 1; |
122 | int oval = 1; |
118 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
123 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
119 | } |
124 | } |
120 | |
125 | |
121 | sockinfo si (THISNODE, PROT_UDPv4); |
126 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
122 | |
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123 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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124 | { |
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125 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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126 | exit (1); |
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127 | } |
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128 | |
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129 | #ifdef IP_MTU_DISCOVER |
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130 | // this I really consider a linux bug. I am neither connected |
127 | // this I really consider a linux bug. I am neither connected |
131 | // 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 |
132 | // fragment for me sometimes. |
129 | // fragment for me sometimes. |
133 | { |
130 | { |
134 | int oval = IP_PMTUDISC_DONT; |
131 | int oval = IP_PMTUDISC_DONT; |
135 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
132 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
136 | } |
133 | } |
137 | #endif |
134 | #endif |
138 | |
135 | |
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136 | sockinfo si (THISNODE, PROT_UDPv4); |
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137 | |
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138 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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139 | { |
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140 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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141 | exit (1); |
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142 | } |
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143 | |
139 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
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145 | } |
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146 | |
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147 | icmpv4_fd = -1; |
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148 | |
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149 | #if ENABLE_ICMP |
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150 | if (THISNODE->protocols & PROT_ICMPv4) |
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151 | { |
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152 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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153 | |
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154 | if (icmpv4_fd < 0) |
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155 | return -1; |
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156 | |
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157 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
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158 | |
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159 | #ifdef ICMP_FILTER |
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160 | { |
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161 | icmp_filter oval; |
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162 | oval.data = 0xffffffff; |
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163 | if (::conf.icmp_type < 32) |
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164 | oval.data &= ~(1 << ::conf.icmp_type); |
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165 | |
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166 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
140 | } |
167 | } |
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168 | #endif |
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169 | |
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170 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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171 | // this I really consider a linux bug. I am neither connected |
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172 | // nor do I fragment myself. Linux still sets DF and doesn't |
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173 | // fragment for me sometimes. |
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174 | { |
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175 | int oval = IP_PMTUDISC_DONT; |
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176 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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177 | } |
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178 | #endif |
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179 | |
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180 | sockinfo si (THISNODE, PROT_ICMPv4); |
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181 | |
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182 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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183 | { |
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184 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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185 | exit (1); |
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186 | } |
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187 | |
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188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
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189 | } |
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190 | #endif |
141 | |
191 | |
142 | tcpv4_fd = -1; |
192 | tcpv4_fd = -1; |
143 | |
193 | |
144 | #if ENABLE_TCP |
194 | #if ENABLE_TCP |
145 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
195 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
146 | { |
196 | { |
147 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
197 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
148 | |
198 | |
149 | if (tcpv4_fd < 0) |
199 | if (tcpv4_fd < 0) |
150 | return -1; |
200 | return -1; |
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201 | |
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202 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
151 | |
203 | |
152 | // standard daemon practise... |
204 | // standard daemon practise... |
153 | { |
205 | { |
154 | int oval = 1; |
206 | int oval = 1; |
155 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
207 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
167 | { |
219 | { |
168 | 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)); |
169 | exit (1); |
221 | exit (1); |
170 | } |
222 | } |
171 | |
223 | |
172 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
173 | } |
225 | } |
174 | #endif |
226 | #endif |
175 | |
227 | |
176 | tap = new tap_device (); |
228 | tap = new tap_device (); |
177 | if (!tap) //D this, of course, never catches |
229 | if (!tap) //D this, of course, never catches |
… | |
… | |
180 | exit (1); |
232 | exit (1); |
181 | } |
233 | } |
182 | |
234 | |
183 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
235 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
184 | |
236 | |
185 | tap_ev_watcher.start (tap->fd, POLLIN); |
237 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
186 | |
238 | |
187 | reconnect_all (); |
239 | reconnect_all (); |
188 | |
240 | |
189 | return 0; |
241 | return 0; |
190 | } |
242 | } |
… | |
… | |
204 | #if ENABLE_TCP |
256 | #if ENABLE_TCP |
205 | case PROT_TCPv4: |
257 | case PROT_TCPv4: |
206 | return send_tcpv4_packet (pkt, si, tos); |
258 | return send_tcpv4_packet (pkt, si, tos); |
207 | #endif |
259 | #endif |
208 | |
260 | |
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261 | #if ENABLE_ICMP |
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262 | case PROT_ICMPv4: |
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263 | return send_icmpv4_packet (pkt, si, tos); |
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264 | #endif |
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265 | |
209 | default: |
266 | default: |
210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
211 | return false; |
268 | return false; |
212 | } |
269 | } |
213 | } |
270 | } |
214 | |
271 | |
215 | bool |
272 | bool |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
273 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
217 | { |
274 | { |
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275 | #if defined(SOL_IP) && defined(IP_TOS) |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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277 | #endif |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
278 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
220 | |
279 | |
221 | return true; |
280 | return true; |
222 | } |
281 | } |
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282 | |
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283 | static u16 |
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284 | ipv4_checksum (u16 *data, unsigned int len) |
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285 | { |
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286 | // use 32 bit accumulator and fold back carry bits at the end |
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287 | u32 sum = 0; |
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288 | |
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289 | while (len > 1) |
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290 | { |
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291 | sum += *data++; |
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292 | len -= 2; |
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293 | } |
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294 | |
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295 | // odd byte left? |
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296 | if (len) |
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297 | sum += *(u8 *)data; |
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298 | |
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299 | // add back carry bits |
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300 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
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301 | sum += (sum >> 16); // carry |
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302 | |
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303 | return ~sum; |
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304 | } |
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305 | |
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306 | #if ENABLE_ICMP |
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307 | bool |
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308 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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309 | { |
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310 | #if defined(SOL_IP) && defined(IP_TOS) |
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311 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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312 | #endif |
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313 | |
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314 | pkt->unshift_hdr (4); |
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315 | |
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316 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
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317 | hdr->type = ::conf.icmp_type; |
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318 | hdr->code = 255; |
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319 | hdr->checksum = 0; |
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320 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
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321 | |
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322 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
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323 | |
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324 | return true; |
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325 | } |
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326 | #endif |
223 | |
327 | |
224 | bool |
328 | bool |
225 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
329 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
226 | { |
330 | { |
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331 | #if defined(SOL_IP) && defined(IP_TOS) |
227 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
332 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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333 | #endif |
228 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
334 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
229 | |
335 | |
230 | return true; |
336 | return true; |
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337 | } |
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338 | |
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339 | void |
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340 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
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341 | { |
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342 | if (dst) |
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343 | { |
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344 | // unicast |
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345 | if (dst != THISNODE->id) |
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346 | conns[dst - 1]->inject_data_packet (pkt); |
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347 | } |
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348 | else |
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349 | { |
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350 | // broadcast, this is ugly, but due to the security policy |
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351 | // we have to connect to all hosts... |
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352 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
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353 | if ((*c)->conf != THISNODE) |
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354 | (*c)->inject_data_packet (pkt, true); |
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355 | } |
231 | } |
356 | } |
232 | |
357 | |
233 | void |
358 | void |
234 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
359 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
235 | { |
360 | { |
… | |
… | |
249 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
374 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
250 | else |
375 | else |
251 | { |
376 | { |
252 | connection *c = conns[src - 1]; |
377 | connection *c = conns[src - 1]; |
253 | |
378 | |
254 | if (dst == 0 && !THISNODE->routerprio) |
379 | if (dst == 0) |
255 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
380 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
256 | c->conf->nodename, (const char *)rsi); |
381 | c->conf->nodename, (const char *)rsi); |
257 | else if (dst != 0 && dst != THISNODE->id) |
382 | else if (dst != THISNODE->id) |
258 | { |
383 | { |
259 | if (THISNODE->routerprio) |
384 | if (THISNODE->routerprio) |
260 | // the tos setting gets lost here. who cares. |
385 | // the tos setting gets lost here. who cares. |
261 | conns[dst - 1]->inject_vpn_packet (pkt); |
386 | conns[dst - 1]->inject_vpn_packet (pkt); |
262 | else |
387 | else |
… | |
… | |
269 | c->recv_vpn_packet (pkt, rsi); |
394 | c->recv_vpn_packet (pkt, rsi); |
270 | } |
395 | } |
271 | } |
396 | } |
272 | |
397 | |
273 | void |
398 | void |
274 | vpn::udpv4_ev (io_watcher &w, short revents) |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
275 | { |
400 | { |
276 | if (revents & (POLLIN | POLLERR)) |
401 | if (revents & EVENT_READ) |
277 | { |
402 | { |
278 | vpn_packet *pkt = new vpn_packet; |
403 | vpn_packet *pkt = new vpn_packet; |
279 | struct sockaddr_in sa; |
404 | struct sockaddr_in sa; |
280 | socklen_t sa_len = sizeof (sa); |
405 | socklen_t sa_len = sizeof (sa); |
281 | int len; |
406 | int len; |
282 | |
407 | |
283 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
408 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
284 | |
409 | |
285 | sockinfo si(sa, PROT_UDPv4); |
410 | sockinfo si(sa, PROT_IPv4); |
286 | |
411 | |
287 | if (len > 0) |
412 | if (len > 0) |
288 | { |
413 | { |
289 | pkt->len = len; |
414 | pkt->len = len; |
290 | |
415 | |
|
|
416 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
417 | // this is slow, but... |
|
|
418 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
419 | |
291 | recv_vpn_packet (pkt, si); |
420 | recv_vpn_packet (pkt, si); |
292 | } |
421 | } |
293 | else |
422 | else |
294 | { |
423 | { |
295 | // probably ECONNRESET or somesuch |
424 | // probably ECONNRESET or somesuch |
296 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
425 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
297 | } |
426 | } |
298 | |
427 | |
299 | delete pkt; |
428 | delete pkt; |
300 | } |
|
|
301 | else if (revents & POLLHUP) |
|
|
302 | { |
|
|
303 | // this cannot ;) happen on udp sockets |
|
|
304 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
305 | exit (1); |
|
|
306 | } |
429 | } |
307 | else |
430 | else |
308 | { |
431 | { |
309 | slog (L_ERR, |
432 | slog (L_ERR, |
310 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
433 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
311 | revents); |
434 | revents); |
312 | exit (1); |
435 | exit (1); |
313 | } |
436 | } |
314 | } |
437 | } |
315 | |
438 | |
|
|
439 | #if ENABLE_ICMP |
316 | void |
440 | void |
317 | vpn::ipv4_ev (io_watcher &w, short revents) |
441 | vpn::icmpv4_ev (io_watcher &w, short revents) |
318 | { |
442 | { |
319 | if (revents & (POLLIN | POLLERR)) |
443 | if (revents & EVENT_READ) |
320 | { |
444 | { |
321 | vpn_packet *pkt = new vpn_packet; |
445 | vpn_packet *pkt = new vpn_packet; |
322 | struct sockaddr_in sa; |
446 | struct sockaddr_in sa; |
323 | socklen_t sa_len = sizeof (sa); |
447 | socklen_t sa_len = sizeof (sa); |
324 | int len; |
448 | int len; |
325 | |
449 | |
326 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
450 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
327 | |
451 | |
328 | sockinfo si(sa, PROT_IPv4); |
452 | sockinfo si(sa, PROT_ICMPv4); |
329 | |
453 | |
330 | if (len > 0) |
454 | if (len > 0) |
331 | { |
455 | { |
332 | pkt->len = len; |
456 | pkt->len = len; |
333 | |
457 | |
|
|
458 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
459 | |
|
|
460 | if (hdr->type == ::conf.icmp_type |
|
|
461 | && hdr->code == 255) |
|
|
462 | { |
334 | // raw sockets deliver the ipv4, but don't expect it on sends |
463 | // raw sockets deliver the ipv4, but don't expect it on sends |
335 | // this is slow, but... |
464 | // this is slow, but... |
336 | pkt->skip_hdr (IP_OVERHEAD); |
465 | pkt->skip_hdr (ICMP_OVERHEAD); |
337 | |
466 | |
338 | recv_vpn_packet (pkt, si); |
467 | recv_vpn_packet (pkt, si); |
|
|
468 | } |
339 | } |
469 | } |
340 | else |
470 | else |
341 | { |
471 | { |
342 | // probably ECONNRESET or somesuch |
472 | // probably ECONNRESET or somesuch |
343 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
473 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
344 | } |
474 | } |
345 | |
475 | |
346 | delete pkt; |
476 | delete pkt; |
347 | } |
|
|
348 | else if (revents & POLLHUP) |
|
|
349 | { |
|
|
350 | // this cannot ;) happen on udp sockets |
|
|
351 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
352 | exit (1); |
|
|
353 | } |
477 | } |
354 | else |
478 | else |
355 | { |
479 | { |
356 | slog (L_ERR, |
480 | slog (L_ERR, |
357 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
481 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
358 | revents); |
482 | revents); |
359 | exit (1); |
483 | exit (1); |
360 | } |
484 | } |
361 | } |
485 | } |
|
|
486 | #endif |
|
|
487 | |
|
|
488 | void |
|
|
489 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
490 | { |
|
|
491 | if (revents & EVENT_READ) |
|
|
492 | { |
|
|
493 | vpn_packet *pkt = new vpn_packet; |
|
|
494 | struct sockaddr_in sa; |
|
|
495 | socklen_t sa_len = sizeof (sa); |
|
|
496 | int len; |
|
|
497 | |
|
|
498 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
499 | |
|
|
500 | sockinfo si(sa, PROT_UDPv4); |
|
|
501 | |
|
|
502 | if (len > 0) |
|
|
503 | { |
|
|
504 | pkt->len = len; |
|
|
505 | |
|
|
506 | recv_vpn_packet (pkt, si); |
|
|
507 | } |
|
|
508 | else |
|
|
509 | { |
|
|
510 | // probably ECONNRESET or somesuch |
|
|
511 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
512 | } |
|
|
513 | |
|
|
514 | delete pkt; |
|
|
515 | } |
|
|
516 | else |
|
|
517 | { |
|
|
518 | slog (L_ERR, |
|
|
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
520 | revents); |
|
|
521 | exit (1); |
|
|
522 | } |
|
|
523 | } |
362 | |
524 | |
363 | void |
525 | void |
364 | vpn::tap_ev (io_watcher &w, short revents) |
526 | vpn::tap_ev (io_watcher &w, short revents) |
365 | { |
527 | { |
366 | if (revents & POLLIN) |
528 | if (revents & EVENT_READ) |
367 | { |
529 | { |
368 | /* process data */ |
530 | /* process data */ |
369 | tap_packet *pkt; |
531 | tap_packet *pkt; |
370 | |
532 | |
371 | pkt = tap->recv (); |
533 | pkt = tap->recv (); |
372 | |
534 | |
|
|
535 | if (!pkt) |
|
|
536 | return; |
|
|
537 | |
|
|
538 | if (pkt->len > 14) |
|
|
539 | { |
373 | int dst = mac2id (pkt->dst); |
540 | int dst = mac2id (pkt->dst); |
374 | int src = mac2id (pkt->src); |
541 | int src = mac2id (pkt->src); |
375 | |
542 | |
376 | if (src != THISNODE->id) |
543 | if (src != THISNODE->id) |
377 | { |
|
|
378 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
379 | exit (1); |
|
|
380 | } |
|
|
381 | |
|
|
382 | if (dst == THISNODE->id) |
|
|
383 | { |
|
|
384 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
385 | exit (1); |
|
|
386 | } |
|
|
387 | |
|
|
388 | if (dst > conns.size ()) |
|
|
389 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
390 | else |
|
|
391 | { |
|
|
392 | if (dst) |
|
|
393 | { |
544 | { |
394 | // unicast |
545 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
395 | if (dst != THISNODE->id) |
546 | exit (1); |
396 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
397 | } |
547 | } |
|
|
548 | |
|
|
549 | if (dst == THISNODE->id) |
|
|
550 | { |
|
|
551 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
552 | exit (1); |
|
|
553 | } |
|
|
554 | |
|
|
555 | if (dst > conns.size ()) |
|
|
556 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
398 | else |
557 | else |
399 | { |
|
|
400 | // broadcast, first check router, then self, then english |
|
|
401 | connection *router = find_router (); |
|
|
402 | |
|
|
403 | if (router) |
|
|
404 | router->inject_data_packet (pkt, true); |
558 | inject_data_packet (pkt, dst); |
405 | else |
|
|
406 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
407 | if ((*c)->conf != THISNODE) |
|
|
408 | (*c)->inject_data_packet (pkt); |
|
|
409 | } |
|
|
410 | } |
559 | } |
411 | |
560 | |
412 | delete pkt; |
561 | delete pkt; |
413 | } |
|
|
414 | else if (revents & (POLLHUP | POLLERR)) |
|
|
415 | { |
|
|
416 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
417 | exit (1); |
|
|
418 | } |
562 | } |
419 | else |
563 | else |
420 | abort (); |
564 | abort (); |
421 | } |
565 | } |
422 | |
566 | |
… | |
… | |
428 | if (events & EVENT_SHUTDOWN) |
572 | if (events & EVENT_SHUTDOWN) |
429 | { |
573 | { |
430 | slog (L_INFO, _("preparing shutdown...")); |
574 | slog (L_INFO, _("preparing shutdown...")); |
431 | |
575 | |
432 | shutdown_all (); |
576 | shutdown_all (); |
433 | |
|
|
434 | remove_pid (pidfilename); |
577 | remove_pid (pidfilename); |
435 | |
|
|
436 | slog (L_INFO, _("terminating")); |
578 | slog (L_INFO, _("terminating")); |
437 | |
|
|
438 | exit (0); |
579 | exit (0); |
439 | } |
580 | } |
440 | |
581 | |
441 | if (events & EVENT_RECONNECT) |
582 | if (events & EVENT_RECONNECT) |
442 | { |
583 | { |
… | |
… | |
445 | reconnect_all (); |
586 | reconnect_all (); |
446 | } |
587 | } |
447 | |
588 | |
448 | events = 0; |
589 | events = 0; |
449 | } |
590 | } |
450 | |
|
|
451 | w.at = TSTAMP_CANCEL; |
|
|
452 | } |
591 | } |
453 | |
592 | |
454 | void |
593 | void |
455 | vpn::shutdown_all () |
594 | vpn::shutdown_all () |
456 | { |
595 | { |
… | |
… | |
480 | } |
619 | } |
481 | } |
620 | } |
482 | |
621 | |
483 | connection *vpn::find_router () |
622 | connection *vpn::find_router () |
484 | { |
623 | { |
485 | u32 prio = 0; |
624 | u32 prio = 1; |
486 | connection *router = 0; |
625 | connection *router = 0; |
487 | |
626 | |
488 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
627 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
489 | { |
628 | { |
490 | connection *c = *i; |
629 | connection *c = *i; |
491 | |
630 | |
492 | if (c->conf->routerprio > prio |
631 | if (c->conf->routerprio > prio |
493 | && c->connectmode == conf_node::C_ALWAYS |
632 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
494 | && c->conf != THISNODE |
|
|
495 | && c->ictx && c->octx) |
633 | && c->ictx && c->octx |
|
|
634 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
496 | { |
635 | { |
497 | prio = c->conf->routerprio; |
636 | prio = c->conf->routerprio; |
498 | router = c; |
637 | router = c; |
499 | } |
638 | } |
500 | } |
639 | } |
… | |
… | |
509 | if (c) |
648 | if (c) |
510 | c->send_connect_request (id); |
649 | c->send_connect_request (id); |
511 | else |
650 | else |
512 | // no router found, aggressively connect to all routers |
651 | // no router found, aggressively connect to all routers |
513 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
652 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
514 | if ((*i)->conf->routerprio) |
653 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
515 | (*i)->establish_connection (); |
654 | (*i)->establish_connection (); |
516 | } |
655 | } |
517 | |
656 | |
518 | void |
657 | void |
519 | connection::dump_status () |
658 | connection::dump_status () |
… | |
… | |
537 | |
676 | |
538 | slog (L_NOTICE, _("END status dump")); |
677 | slog (L_NOTICE, _("END status dump")); |
539 | } |
678 | } |
540 | |
679 | |
541 | vpn::vpn (void) |
680 | vpn::vpn (void) |
542 | : event(this, &vpn::event_cb) |
681 | : event (this, &vpn::event_cb) |
543 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
682 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
544 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
683 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
545 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
546 | #if ENABLE_TCP |
684 | #if ENABLE_TCP |
547 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
685 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
548 | #endif |
686 | #endif |
|
|
687 | #if ENABLE_ICMP |
|
|
688 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
689 | #endif |
|
|
690 | , tap_ev_watcher (this, &vpn::tap_ev) |
549 | { |
691 | { |
550 | } |
692 | } |
551 | |
693 | |
552 | vpn::~vpn () |
694 | vpn::~vpn () |
553 | { |
695 | { |