1 | /* |
1 | /* |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
2 | vpn.C -- handle the protocol, encryption, handshaking etc. |
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3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
18 | |
19 | |
19 | #include "config.h" |
20 | #include "config.h" |
20 | |
21 | |
21 | #include <list> |
22 | #include <list> |
22 | |
23 | |
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24 | #include <cstdio> |
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25 | #include <cstring> |
23 | #include <cstdlib> |
26 | #include <cstdlib> |
24 | #include <cstring> |
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25 | #include <cstdio> |
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26 | |
27 | |
27 | #include <sys/types.h> |
28 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
29 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
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30 | #include <sys/wait.h> |
30 | #include <sys/wait.h> |
31 | #include <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 | |
… | |
… | |
71 | } |
72 | } |
72 | |
73 | |
73 | int |
74 | int |
74 | vpn::setup () |
75 | vpn::setup () |
75 | { |
76 | { |
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77 | ipv4_fd = -1; |
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78 | |
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79 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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80 | { |
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81 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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82 | |
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83 | if (ipv4_fd < 0) |
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84 | return -1; |
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85 | |
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86 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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87 | |
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88 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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89 | // this I really consider a linux bug. I am neither connected |
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90 | // nor do I fragment myself. Linux still sets DF and doesn't |
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91 | // fragment for me sometimes. |
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92 | { |
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93 | int oval = IP_PMTUDISC_DONT; |
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94 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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95 | } |
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96 | #endif |
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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 (EXIT_FAILURE); |
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104 | } |
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105 | |
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106 | ipv4_ev_watcher.start (ipv4_fd, EVENT_READ); |
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107 | } |
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108 | |
76 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
77 | |
110 | |
78 | if (THISNODE->protocols & PROT_UDPv4) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
79 | { |
112 | { |
80 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
113 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
81 | |
114 | |
82 | if (udpv4_fd < 0) |
115 | if (udpv4_fd < 0) |
83 | return -1; |
116 | return -1; |
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117 | |
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118 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
84 | |
119 | |
85 | // standard daemon practise... |
120 | // standard daemon practise... |
86 | { |
121 | { |
87 | int oval = 1; |
122 | int oval = 1; |
88 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
123 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
89 | } |
124 | } |
90 | |
125 | |
91 | sockinfo si (THISNODE, PROT_UDPv4); |
126 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
92 | |
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93 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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94 | { |
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95 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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96 | exit (1); |
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97 | } |
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98 | |
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99 | #ifdef IP_MTU_DISCOVER |
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100 | // this I really consider a linux bug. I am neither connected |
127 | // this I really consider a linux bug. I am neither connected |
101 | // 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 |
102 | // fragment for me sometimes. |
129 | // fragment for me sometimes. |
103 | { |
130 | { |
104 | int oval = IP_PMTUDISC_DONT; |
131 | int oval = IP_PMTUDISC_DONT; |
105 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
132 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
106 | } |
133 | } |
107 | #endif |
134 | #endif |
108 | |
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 (EXIT_FAILURE); |
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142 | } |
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143 | |
109 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, EVENT_READ); |
110 | } |
145 | } |
111 | |
146 | |
112 | ipv4_fd = -1; |
147 | icmpv4_fd = -1; |
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148 | |
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149 | #if ENABLE_ICMP |
113 | if (THISNODE->protocols & PROT_IPv4) |
150 | if (THISNODE->protocols & PROT_ICMPv4) |
114 | { |
151 | { |
115 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
152 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
116 | |
153 | |
117 | if (ipv4_fd < 0) |
154 | if (icmpv4_fd < 0) |
118 | return -1; |
155 | return -1; |
119 | |
156 | |
120 | sockinfo si (THISNODE, PROT_IPv4); |
157 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
121 | |
158 | |
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
159 | #ifdef ICMP_FILTER |
123 | { |
160 | { |
124 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
161 | icmp_filter oval; |
125 | exit (1); |
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); |
126 | } |
167 | } |
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168 | #endif |
127 | |
169 | |
128 | #ifdef IP_MTU_DISCOVER |
170 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
129 | // this I really consider a linux bug. I am neither connected |
171 | // this I really consider a linux bug. I am neither connected |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
172 | // nor do I fragment myself. Linux still sets DF and doesn't |
131 | // fragment for me sometimes. |
173 | // fragment for me sometimes. |
132 | { |
174 | { |
133 | int oval = IP_PMTUDISC_DONT; |
175 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
176 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
177 | } |
136 | #endif |
178 | #endif |
137 | |
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 (EXIT_FAILURE); |
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186 | } |
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187 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
188 | icmpv4_ev_watcher.start (icmpv4_fd, EVENT_READ); |
139 | } |
189 | } |
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190 | #endif |
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191 | |
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192 | tcpv4_fd = -1; |
140 | |
193 | |
141 | #if ENABLE_TCP |
194 | #if ENABLE_TCP |
142 | if (THISNODE->protocols & PROT_TCPv4) |
195 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
143 | { |
196 | { |
144 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
197 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
145 | |
198 | |
146 | if (tcpv4_fd < 0) |
199 | if (tcpv4_fd < 0) |
147 | return -1; |
200 | return -1; |
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201 | |
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202 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
148 | |
203 | |
149 | // standard daemon practise... |
204 | // standard daemon practise... |
150 | { |
205 | { |
151 | int oval = 1; |
206 | int oval = 1; |
152 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
207 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
155 | sockinfo si (THISNODE, PROT_TCPv4); |
210 | sockinfo si (THISNODE, PROT_TCPv4); |
156 | |
211 | |
157 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
212 | if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) |
158 | { |
213 | { |
159 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
214 | slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); |
160 | exit (1); |
215 | exit (EXIT_FAILURE); |
161 | } |
216 | } |
162 | |
217 | |
163 | if (listen (tcpv4_fd, 5)) |
218 | if (listen (tcpv4_fd, 5)) |
164 | { |
219 | { |
165 | 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)); |
166 | exit (1); |
221 | exit (EXIT_FAILURE); |
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222 | } |
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223 | |
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224 | tcpv4_ev_watcher.start (tcpv4_fd, EVENT_READ); |
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225 | } |
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226 | #endif |
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227 | |
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228 | #if ENABLE_DNS |
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229 | if (THISNODE->protocols & PROT_DNSv4) |
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230 | { |
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231 | dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
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232 | |
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233 | if (dnsv4_fd < 0) |
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234 | return -1; |
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235 | |
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236 | // standard daemon practise... |
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237 | { |
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238 | int oval = 1; |
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239 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
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240 | } |
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241 | |
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242 | sockinfo si (THISNODE, PROT_DNSv4); |
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243 | |
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244 | if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) |
167 | } |
245 | { |
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246 | slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); |
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247 | exit (EXIT_FAILURE); |
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248 | } |
168 | |
249 | |
169 | tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); |
250 | dnsv4_ev_watcher.start (dnsv4_fd, EVENT_READ); |
170 | } |
251 | } |
171 | #endif |
252 | #endif |
172 | |
253 | |
173 | tap = new tap_device (); |
254 | tap = new tap_device (); |
174 | if (!tap) //D this, of course, never catches |
255 | if (!tap) //D this, of course, never catches |
175 | { |
256 | { |
176 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
257 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
177 | exit (1); |
258 | exit (EXIT_FAILURE); |
178 | } |
259 | } |
179 | |
260 | |
180 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
261 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
181 | |
262 | |
182 | tap_ev_watcher.start (tap->fd, POLLIN); |
263 | tap_ev_watcher.start (tap->fd, EVENT_READ); |
183 | |
264 | |
184 | reconnect_all (); |
265 | reconnect_all (); |
185 | |
266 | |
186 | return 0; |
267 | return 0; |
187 | } |
268 | } |
188 | |
269 | |
189 | // send a vpn packet out to other hosts |
270 | // send a vpn packet out to other hosts |
190 | void |
271 | bool |
191 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
272 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
192 | { |
273 | { |
193 | switch (si.prot) |
274 | switch (si.prot) |
194 | { |
275 | { |
195 | case PROT_IPv4: |
276 | case PROT_IPv4: |
196 | send_ipv4_packet (pkt, si, tos); |
277 | return send_ipv4_packet (pkt, si, tos); |
197 | break; |
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198 | |
278 | |
199 | case PROT_UDPv4: |
279 | case PROT_UDPv4: |
200 | send_udpv4_packet (pkt, si, tos); |
280 | return send_udpv4_packet (pkt, si, tos); |
201 | break; |
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202 | |
281 | |
203 | #if ENABLE_TCP |
282 | #if ENABLE_TCP |
204 | case PROT_TCPv4: |
283 | case PROT_TCPv4: |
205 | send_tcpv4_packet (pkt, si, tos); |
284 | return send_tcpv4_packet (pkt, si, tos); |
206 | break; |
285 | #endif |
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286 | |
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287 | #if ENABLE_ICMP |
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288 | case PROT_ICMPv4: |
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289 | return send_icmpv4_packet (pkt, si, tos); |
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290 | #endif |
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291 | |
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292 | #if ENABLE_DNS |
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293 | case PROT_DNSv4: |
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294 | return send_dnsv4_packet (pkt, si, tos); |
207 | #endif |
295 | #endif |
208 | |
296 | |
209 | default: |
297 | default: |
210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
298 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
211 | abort (); |
299 | return false; |
212 | } |
300 | } |
213 | } |
301 | } |
214 | |
302 | |
215 | void |
303 | bool |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
304 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
217 | { |
305 | { |
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306 | #if defined(SOL_IP) && defined(IP_TOS) |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
307 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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308 | #endif |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
309 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
220 | } |
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221 | |
310 | |
222 | void |
311 | return true; |
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312 | } |
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313 | |
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314 | static u16 |
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315 | ipv4_checksum (u16 *data, unsigned int len) |
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316 | { |
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317 | // use 32 bit accumulator and fold back carry bits at the end |
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318 | u32 sum = 0; |
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319 | |
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320 | while (len > 1) |
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321 | { |
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322 | sum += *data++; |
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323 | len -= 2; |
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324 | } |
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325 | |
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326 | // odd byte left? |
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327 | if (len) |
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328 | sum += *(u8 *)data; |
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329 | |
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330 | // add back carry bits |
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331 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
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332 | sum += (sum >> 16); // carry |
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333 | |
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334 | return ~sum; |
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335 | } |
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336 | |
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337 | #if ENABLE_ICMP |
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338 | bool |
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339 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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340 | { |
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341 | #if defined(SOL_IP) && defined(IP_TOS) |
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342 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
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343 | #endif |
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344 | |
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345 | pkt->unshift_hdr (4); |
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346 | |
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347 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
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348 | hdr->type = ::conf.icmp_type; |
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349 | hdr->code = 255; |
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350 | hdr->checksum = 0; |
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351 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
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352 | |
|
|
353 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
354 | |
|
|
355 | return true; |
|
|
356 | } |
|
|
357 | #endif |
|
|
358 | |
|
|
359 | bool |
223 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
360 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
224 | { |
361 | { |
|
|
362 | #if defined(SOL_IP) && defined(IP_TOS) |
225 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
363 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
364 | #endif |
226 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
365 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
366 | |
|
|
367 | return true; |
|
|
368 | } |
|
|
369 | |
|
|
370 | void |
|
|
371 | vpn::inject_data_packet (tap_packet *pkt, int dst) |
|
|
372 | { |
|
|
373 | if (dst) |
|
|
374 | { |
|
|
375 | // unicast |
|
|
376 | if (dst != THISNODE->id) |
|
|
377 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
378 | } |
|
|
379 | else |
|
|
380 | { |
|
|
381 | // broadcast, this is ugly, but due to the security policy |
|
|
382 | // we have to connect to all hosts... |
|
|
383 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
384 | if ((*c)->conf != THISNODE) |
|
|
385 | (*c)->inject_data_packet (pkt, true); |
|
|
386 | } |
227 | } |
387 | } |
228 | |
388 | |
229 | void |
389 | void |
230 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
390 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
231 | { |
391 | { |
… | |
… | |
238 | if (src == 0 || src > conns.size () |
398 | if (src == 0 || src > conns.size () |
239 | || dst > conns.size () |
399 | || dst > conns.size () |
240 | || pkt->typ () >= vpn_packet::PT_MAX) |
400 | || pkt->typ () >= vpn_packet::PT_MAX) |
241 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
401 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
242 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
402 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
403 | else if (dst > conns.size ()) |
|
|
404 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
405 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
243 | else |
406 | else |
244 | { |
407 | { |
245 | connection *c = conns[src - 1]; |
408 | connection *c = conns[src - 1]; |
246 | |
409 | |
247 | if (dst == 0 && !THISNODE->routerprio) |
410 | if (dst == 0) |
248 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
411 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
249 | c->conf->nodename, (const char *)rsi); |
412 | c->conf->nodename, (const char *)rsi); |
250 | else if (dst != 0 && dst != THISNODE->id) |
413 | else if (dst != THISNODE->id) |
251 | // FORWARDING NEEDED ;) |
414 | { |
|
|
415 | if (THISNODE->routerprio) |
|
|
416 | // the tos setting gets lost here. who cares. |
|
|
417 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
418 | else |
252 | slog (L_WARN, |
419 | slog (L_WARN, |
253 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
420 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
|
|
421 | c->conf->nodename, (const char *)rsi, |
254 | dst, conns[dst - 1]->conf->nodename, |
422 | conns[dst - 1]->conf->nodename); |
255 | (const char *)rsi, |
423 | } |
256 | THISNODE->id, THISNODE->nodename); |
|
|
257 | else |
424 | else |
258 | c->recv_vpn_packet (pkt, rsi); |
425 | c->recv_vpn_packet (pkt, rsi); |
259 | } |
426 | } |
260 | } |
427 | } |
261 | |
428 | |
262 | void |
429 | void |
263 | vpn::udpv4_ev (io_watcher &w, short revents) |
430 | vpn::ipv4_ev (io_watcher &w, short revents) |
264 | { |
431 | { |
265 | if (revents & (POLLIN | POLLERR)) |
432 | if (revents & EVENT_READ) |
266 | { |
433 | { |
267 | vpn_packet *pkt = new vpn_packet; |
434 | vpn_packet *pkt = new vpn_packet; |
268 | struct sockaddr_in sa; |
435 | struct sockaddr_in sa; |
269 | socklen_t sa_len = sizeof (sa); |
436 | socklen_t sa_len = sizeof (sa); |
270 | int len; |
437 | int len; |
271 | |
438 | |
272 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
439 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
273 | |
440 | |
274 | sockinfo si(sa, PROT_UDPv4); |
441 | sockinfo si(sa, PROT_IPv4); |
275 | |
442 | |
276 | if (len > 0) |
443 | if (len > 0) |
277 | { |
444 | { |
278 | pkt->len = len; |
445 | pkt->len = len; |
279 | |
446 | |
|
|
447 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
448 | // this is slow, but... |
|
|
449 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
450 | |
280 | recv_vpn_packet (pkt, si); |
451 | recv_vpn_packet (pkt, si); |
281 | } |
452 | } |
282 | else |
453 | else |
283 | { |
454 | { |
284 | // probably ECONNRESET or somesuch |
455 | // probably ECONNRESET or somesuch |
285 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
456 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
286 | } |
457 | } |
287 | |
458 | |
288 | delete pkt; |
459 | delete pkt; |
289 | } |
|
|
290 | else if (revents & POLLHUP) |
|
|
291 | { |
|
|
292 | // this cannot ;) happen on udp sockets |
|
|
293 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
294 | exit (1); |
|
|
295 | } |
460 | } |
296 | else |
461 | else |
297 | { |
462 | { |
298 | slog (L_ERR, |
463 | slog (L_ERR, |
299 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
464 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
300 | revents); |
465 | revents); |
301 | exit (1); |
466 | exit (EXIT_FAILURE); |
302 | } |
467 | } |
303 | } |
468 | } |
304 | |
469 | |
|
|
470 | #if ENABLE_ICMP |
305 | void |
471 | void |
306 | vpn::ipv4_ev (io_watcher &w, short revents) |
472 | vpn::icmpv4_ev (io_watcher &w, short revents) |
307 | { |
473 | { |
308 | if (revents & (POLLIN | POLLERR)) |
474 | if (revents & EVENT_READ) |
309 | { |
475 | { |
310 | vpn_packet *pkt = new vpn_packet; |
476 | vpn_packet *pkt = new vpn_packet; |
311 | struct sockaddr_in sa; |
477 | struct sockaddr_in sa; |
312 | socklen_t sa_len = sizeof (sa); |
478 | socklen_t sa_len = sizeof (sa); |
313 | int len; |
479 | int len; |
314 | |
480 | |
315 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
481 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
316 | |
482 | |
317 | sockinfo si(sa, PROT_IPv4); |
483 | sockinfo si(sa, PROT_ICMPv4); |
318 | |
484 | |
319 | if (len > 0) |
485 | if (len > 0) |
320 | { |
486 | { |
321 | pkt->len = len; |
487 | pkt->len = len; |
322 | |
488 | |
|
|
489 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
490 | |
|
|
491 | if (hdr->type == ::conf.icmp_type |
|
|
492 | && hdr->code == 255) |
|
|
493 | { |
323 | // raw sockets deliver the ipv4, but don't expect it on sends |
494 | // raw sockets deliver the ipv4, but don't expect it on sends |
324 | // this is slow, but... |
495 | // this is slow, but... |
325 | pkt->skip_hdr (IP_OVERHEAD); |
496 | pkt->skip_hdr (ICMP_OVERHEAD); |
326 | |
497 | |
327 | recv_vpn_packet (pkt, si); |
498 | recv_vpn_packet (pkt, si); |
|
|
499 | } |
328 | } |
500 | } |
329 | else |
501 | else |
330 | { |
502 | { |
331 | // probably ECONNRESET or somesuch |
503 | // probably ECONNRESET or somesuch |
332 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
504 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
333 | } |
505 | } |
334 | |
506 | |
335 | delete pkt; |
507 | delete pkt; |
336 | } |
|
|
337 | else if (revents & POLLHUP) |
|
|
338 | { |
|
|
339 | // this cannot ;) happen on udp sockets |
|
|
340 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
341 | exit (1); |
|
|
342 | } |
508 | } |
343 | else |
509 | else |
344 | { |
510 | { |
345 | slog (L_ERR, |
511 | slog (L_ERR, |
346 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
512 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
347 | revents); |
513 | revents); |
348 | exit (1); |
514 | exit (EXIT_FAILURE); |
|
|
515 | } |
|
|
516 | } |
|
|
517 | #endif |
|
|
518 | |
|
|
519 | void |
|
|
520 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
521 | { |
|
|
522 | if (revents & EVENT_READ) |
|
|
523 | { |
|
|
524 | vpn_packet *pkt = new vpn_packet; |
|
|
525 | struct sockaddr_in sa; |
|
|
526 | socklen_t sa_len = sizeof (sa); |
|
|
527 | int len; |
|
|
528 | |
|
|
529 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
530 | |
|
|
531 | sockinfo si(sa, PROT_UDPv4); |
|
|
532 | |
|
|
533 | if (len > 0) |
|
|
534 | { |
|
|
535 | pkt->len = len; |
|
|
536 | |
|
|
537 | recv_vpn_packet (pkt, si); |
|
|
538 | } |
|
|
539 | else |
|
|
540 | { |
|
|
541 | // probably ECONNRESET or somesuch |
|
|
542 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
543 | } |
|
|
544 | |
|
|
545 | delete pkt; |
|
|
546 | } |
|
|
547 | else |
|
|
548 | { |
|
|
549 | slog (L_ERR, |
|
|
550 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
551 | revents); |
|
|
552 | exit (EXIT_FAILURE); |
349 | } |
553 | } |
350 | } |
554 | } |
351 | |
555 | |
352 | void |
556 | void |
353 | vpn::tap_ev (io_watcher &w, short revents) |
557 | vpn::tap_ev (io_watcher &w, short revents) |
354 | { |
558 | { |
355 | if (revents & POLLIN) |
559 | if (revents & EVENT_READ) |
356 | { |
560 | { |
357 | /* process data */ |
561 | /* process data */ |
358 | tap_packet *pkt; |
562 | tap_packet *pkt; |
359 | |
563 | |
360 | pkt = tap->recv (); |
564 | pkt = tap->recv (); |
361 | |
565 | |
|
|
566 | if (!pkt) |
|
|
567 | return; |
|
|
568 | |
|
|
569 | if (pkt->len > 14) |
|
|
570 | { |
362 | int dst = mac2id (pkt->dst); |
571 | int dst = mac2id (pkt->dst); |
363 | int src = mac2id (pkt->src); |
572 | int src = mac2id (pkt->src); |
364 | |
573 | |
365 | if (src != THISNODE->id) |
574 | if (src != THISNODE->id) |
366 | { |
|
|
367 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
368 | exit (1); |
|
|
369 | } |
|
|
370 | |
|
|
371 | if (dst == THISNODE->id) |
|
|
372 | { |
|
|
373 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
374 | exit (1); |
|
|
375 | } |
|
|
376 | |
|
|
377 | if (dst > conns.size ()) |
|
|
378 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
379 | else |
|
|
380 | { |
|
|
381 | if (dst) |
|
|
382 | { |
575 | { |
383 | // unicast |
576 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
384 | if (dst != THISNODE->id) |
577 | exit (EXIT_FAILURE); |
385 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
386 | } |
578 | } |
|
|
579 | |
|
|
580 | if (dst == THISNODE->id) |
|
|
581 | { |
|
|
582 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
583 | exit (EXIT_FAILURE); |
|
|
584 | } |
|
|
585 | |
|
|
586 | if (dst > conns.size ()) |
|
|
587 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
387 | else |
588 | else |
388 | { |
|
|
389 | // broadcast, first check router, then self, then english |
|
|
390 | connection *router = find_router (); |
|
|
391 | |
|
|
392 | if (router) |
|
|
393 | router->inject_data_packet (pkt, true); |
589 | inject_data_packet (pkt, dst); |
394 | else |
|
|
395 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
396 | if ((*c)->conf != THISNODE) |
|
|
397 | (*c)->inject_data_packet (pkt); |
|
|
398 | } |
|
|
399 | } |
590 | } |
400 | |
591 | |
401 | delete pkt; |
592 | delete pkt; |
402 | } |
|
|
403 | else if (revents & (POLLHUP | POLLERR)) |
|
|
404 | { |
|
|
405 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
406 | exit (1); |
|
|
407 | } |
593 | } |
408 | else |
594 | else |
409 | abort (); |
595 | abort (); |
410 | } |
596 | } |
411 | |
597 | |
… | |
… | |
417 | if (events & EVENT_SHUTDOWN) |
603 | if (events & EVENT_SHUTDOWN) |
418 | { |
604 | { |
419 | slog (L_INFO, _("preparing shutdown...")); |
605 | slog (L_INFO, _("preparing shutdown...")); |
420 | |
606 | |
421 | shutdown_all (); |
607 | shutdown_all (); |
422 | |
|
|
423 | remove_pid (pidfilename); |
608 | remove_pid (conf.pidfilename); |
424 | |
|
|
425 | slog (L_INFO, _("terminating")); |
609 | slog (L_INFO, _("terminating")); |
426 | |
610 | exit (EXIT_SUCCESS); |
427 | exit (0); |
|
|
428 | } |
611 | } |
429 | |
612 | |
430 | if (events & EVENT_RECONNECT) |
613 | if (events & EVENT_RECONNECT) |
431 | { |
614 | { |
432 | slog (L_INFO, _("forced reconnect")); |
615 | slog (L_INFO, _("forced reconnect")); |
… | |
… | |
434 | reconnect_all (); |
617 | reconnect_all (); |
435 | } |
618 | } |
436 | |
619 | |
437 | events = 0; |
620 | events = 0; |
438 | } |
621 | } |
439 | |
|
|
440 | w.at = TSTAMP_CANCEL; |
|
|
441 | } |
622 | } |
442 | |
623 | |
443 | void |
624 | void |
444 | vpn::shutdown_all () |
625 | vpn::shutdown_all () |
445 | { |
626 | { |
… | |
… | |
469 | } |
650 | } |
470 | } |
651 | } |
471 | |
652 | |
472 | connection *vpn::find_router () |
653 | connection *vpn::find_router () |
473 | { |
654 | { |
474 | u32 prio = 0; |
655 | u32 prio = 1; |
475 | connection *router = 0; |
656 | connection *router = 0; |
476 | |
657 | |
477 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
658 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
478 | { |
659 | { |
479 | connection *c = *i; |
660 | connection *c = *i; |
480 | |
661 | |
481 | if (c->conf->routerprio > prio |
662 | if (c->conf->routerprio > prio |
482 | && c->connectmode == conf_node::C_ALWAYS |
663 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
483 | && c->conf != THISNODE |
|
|
484 | && c->ictx && c->octx) |
664 | && c->ictx && c->octx |
|
|
665 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
485 | { |
666 | { |
486 | prio = c->conf->routerprio; |
667 | prio = c->conf->routerprio; |
487 | router = c; |
668 | router = c; |
488 | } |
669 | } |
489 | } |
670 | } |
490 | |
671 | |
491 | return router; |
672 | return router; |
492 | } |
673 | } |
493 | |
674 | |
494 | void vpn::connect_request (int id) |
675 | void vpn::send_connect_request (int id) |
495 | { |
676 | { |
496 | connection *c = find_router (); |
677 | connection *c = find_router (); |
497 | |
678 | |
498 | if (c) |
679 | if (c) |
499 | c->connect_request (id); |
680 | c->send_connect_request (id); |
500 | //else // does not work, because all others must connect to the same router |
681 | else |
501 | // // no router found, aggressively connect to all routers |
682 | // no router found, aggressively connect to all routers |
502 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
683 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
503 | // if ((*i)->conf->routerprio) |
684 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
504 | // (*i)->establish_connection (); |
685 | (*i)->establish_connection (); |
505 | } |
686 | } |
506 | |
687 | |
507 | void |
688 | void |
508 | connection::dump_status () |
689 | connection::dump_status () |
509 | { |
690 | { |
… | |
… | |
526 | |
707 | |
527 | slog (L_NOTICE, _("END status dump")); |
708 | slog (L_NOTICE, _("END status dump")); |
528 | } |
709 | } |
529 | |
710 | |
530 | vpn::vpn (void) |
711 | vpn::vpn (void) |
531 | : event(this, &vpn::event_cb) |
712 | : event (this, &vpn::event_cb) |
532 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
713 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
533 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
714 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
534 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
535 | #if ENABLE_TCP |
715 | #if ENABLE_TCP |
536 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
716 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
537 | #endif |
717 | #endif |
|
|
718 | #if ENABLE_ICMP |
|
|
719 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
720 | #endif |
|
|
721 | #if ENABLE_DNS |
|
|
722 | , dnsv4_ev_watcher (this, &vpn::dnsv4_ev) |
|
|
723 | #endif |
|
|
724 | , tap_ev_watcher (this, &vpn::tap_ev) |
538 | { |
725 | { |
539 | } |
726 | } |
540 | |
727 | |
541 | vpn::~vpn () |
728 | vpn::~vpn () |
542 | { |
729 | { |