… | |
… | |
26 | |
26 | |
27 | #include <sys/types.h> |
27 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
28 | #include <sys/socket.h> |
29 | #include <sys/poll.h> |
29 | #include <sys/poll.h> |
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" |
… | |
… | |
71 | } |
73 | } |
72 | |
74 | |
73 | int |
75 | int |
74 | vpn::setup () |
76 | vpn::setup () |
75 | { |
77 | { |
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78 | ipv4_fd = -1; |
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79 | |
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80 | if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) |
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81 | { |
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82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
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83 | |
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84 | if (ipv4_fd < 0) |
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85 | return -1; |
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86 | |
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87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
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88 | |
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89 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
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90 | // this I really consider a linux bug. I am neither connected |
|
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91 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
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92 | // fragment for me sometimes. |
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93 | { |
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94 | int oval = IP_PMTUDISC_DONT; |
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95 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
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96 | } |
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97 | #endif |
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98 | |
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99 | sockinfo si (THISNODE, PROT_IPv4); |
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100 | |
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101 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
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102 | { |
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103 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
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104 | exit (1); |
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105 | } |
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106 | |
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107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
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108 | } |
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109 | |
76 | udpv4_fd = -1; |
110 | udpv4_fd = -1; |
77 | |
111 | |
78 | if (THISNODE->protocols & PROT_UDPv4) |
112 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
79 | { |
113 | { |
80 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
81 | |
115 | |
82 | if (udpv4_fd < 0) |
116 | if (udpv4_fd < 0) |
83 | return -1; |
117 | return -1; |
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118 | |
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119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
84 | |
120 | |
85 | // standard daemon practise... |
121 | // standard daemon practise... |
86 | { |
122 | { |
87 | int oval = 1; |
123 | int oval = 1; |
88 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
89 | } |
125 | } |
90 | |
126 | |
91 | sockinfo si (THISNODE, PROT_UDPv4); |
127 | #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 |
128 | // this I really consider a linux bug. I am neither connected |
101 | // nor do I fragment myself. Linux still sets DF and doesn't |
129 | // nor do I fragment myself. Linux still sets DF and doesn't |
102 | // fragment for me sometimes. |
130 | // fragment for me sometimes. |
103 | { |
131 | { |
104 | int oval = IP_PMTUDISC_DONT; |
132 | int oval = IP_PMTUDISC_DONT; |
105 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
133 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
106 | } |
134 | } |
107 | #endif |
135 | #endif |
108 | |
136 | |
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137 | sockinfo si (THISNODE, PROT_UDPv4); |
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138 | |
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139 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
|
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140 | { |
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141 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
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142 | exit (1); |
|
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143 | } |
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144 | |
109 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
110 | } |
146 | } |
111 | |
147 | |
112 | ipv4_fd = -1; |
148 | icmpv4_fd = -1; |
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149 | |
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150 | #if ENABLE_ICMP |
113 | if (THISNODE->protocols & PROT_IPv4) |
151 | if (THISNODE->protocols & PROT_ICMPv4) |
114 | { |
152 | { |
115 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
116 | |
154 | |
117 | if (ipv4_fd < 0) |
155 | if (icmpv4_fd < 0) |
118 | return -1; |
156 | return -1; |
119 | |
157 | |
120 | sockinfo si (THISNODE, PROT_IPv4); |
158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
121 | |
159 | |
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
160 | #ifdef ICMP_FILTER |
123 | { |
161 | { |
124 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
162 | icmp_filter oval; |
125 | exit (1); |
163 | oval.data = 0xffffffff; |
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164 | if (::conf.icmp_type < 32) |
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165 | oval.data &= ~(1 << ::conf.icmp_type); |
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166 | |
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167 | setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); |
126 | } |
168 | } |
|
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169 | #endif |
127 | |
170 | |
128 | #ifdef IP_MTU_DISCOVER |
171 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
129 | // this I really consider a linux bug. I am neither connected |
172 | // this I really consider a linux bug. I am neither connected |
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
131 | // fragment for me sometimes. |
174 | // fragment for me sometimes. |
132 | { |
175 | { |
133 | int oval = IP_PMTUDISC_DONT; |
176 | int oval = IP_PMTUDISC_DONT; |
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
135 | } |
178 | } |
136 | #endif |
179 | #endif |
137 | |
180 | |
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181 | sockinfo si (THISNODE, PROT_ICMPv4); |
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182 | |
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183 | if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) |
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184 | { |
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185 | slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
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186 | exit (1); |
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187 | } |
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188 | |
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
139 | } |
190 | } |
|
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191 | #endif |
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192 | |
|
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193 | tcpv4_fd = -1; |
140 | |
194 | |
141 | #if ENABLE_TCP |
195 | #if ENABLE_TCP |
142 | if (THISNODE->protocols & PROT_TCPv4) |
196 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
143 | { |
197 | { |
144 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
198 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
145 | |
199 | |
146 | if (tcpv4_fd < 0) |
200 | if (tcpv4_fd < 0) |
147 | return -1; |
201 | return -1; |
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202 | |
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203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
148 | |
204 | |
149 | // standard daemon practise... |
205 | // standard daemon practise... |
150 | { |
206 | { |
151 | int oval = 1; |
207 | int oval = 1; |
152 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
185 | |
241 | |
186 | return 0; |
242 | return 0; |
187 | } |
243 | } |
188 | |
244 | |
189 | // send a vpn packet out to other hosts |
245 | // send a vpn packet out to other hosts |
190 | void |
246 | bool |
191 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
247 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
192 | { |
248 | { |
193 | switch (si.prot) |
249 | switch (si.prot) |
194 | { |
250 | { |
195 | case PROT_IPv4: |
251 | case PROT_IPv4: |
196 | send_ipv4_packet (pkt, si, tos); |
252 | return send_ipv4_packet (pkt, si, tos); |
197 | break; |
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|
198 | |
253 | |
199 | case PROT_UDPv4: |
254 | case PROT_UDPv4: |
200 | send_udpv4_packet (pkt, si, tos); |
255 | return send_udpv4_packet (pkt, si, tos); |
201 | break; |
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202 | |
256 | |
203 | #if ENABLE_TCP |
257 | #if ENABLE_TCP |
204 | case PROT_TCPv4: |
258 | case PROT_TCPv4: |
205 | send_tcpv4_packet (pkt, si, tos); |
259 | return send_tcpv4_packet (pkt, si, tos); |
206 | break; |
260 | #endif |
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261 | |
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262 | #if ENABLE_ICMP |
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263 | case PROT_ICMPv4: |
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264 | return send_icmpv4_packet (pkt, si, tos); |
207 | #endif |
265 | #endif |
208 | |
266 | |
209 | default: |
267 | default: |
210 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
268 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
211 | abort (); |
269 | return false; |
212 | } |
270 | } |
213 | } |
271 | } |
214 | |
272 | |
215 | void |
273 | bool |
216 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
274 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
217 | { |
275 | { |
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276 | #if defined(SOL_IP) && defined(IP_TOS) |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
277 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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278 | #endif |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
279 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
220 | } |
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221 | |
280 | |
222 | void |
281 | return true; |
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282 | } |
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283 | |
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284 | static u16 |
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285 | ipv4_checksum (u16 *data, unsigned int len) |
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286 | { |
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287 | // use 32 bit accumulator and fold back carry bits at the end |
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288 | u32 sum = 0; |
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289 | |
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290 | while (len > 1) |
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291 | { |
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292 | sum += *data++; |
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293 | len -= 2; |
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294 | } |
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295 | |
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296 | // odd byte left? |
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297 | if (len) |
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298 | sum += *(u8 *)data; |
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299 | |
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300 | // add back carry bits |
|
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301 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
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302 | sum += (sum >> 16); // carry |
|
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303 | |
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304 | return ~sum; |
|
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305 | } |
|
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306 | |
|
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307 | #if ENABLE_ICMP |
|
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308 | bool |
|
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309 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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310 | { |
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311 | #if defined(SOL_IP) && defined(IP_TOS) |
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312 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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313 | #endif |
|
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314 | |
|
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315 | pkt->unshift_hdr (4); |
|
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316 | |
|
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317 | icmp_header *hdr = (icmp_header *)&((*pkt)[0]); |
|
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318 | hdr->type = ::conf.icmp_type; |
|
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319 | hdr->code = 255; |
|
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320 | hdr->checksum = 0; |
|
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321 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
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322 | |
|
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323 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
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324 | |
|
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325 | return true; |
|
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326 | } |
|
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327 | #endif |
|
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328 | |
|
|
329 | bool |
223 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
330 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
224 | { |
331 | { |
|
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332 | #if defined(SOL_IP) && defined(IP_TOS) |
225 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
333 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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334 | #endif |
226 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
335 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
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336 | |
|
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337 | return true; |
227 | } |
338 | } |
228 | |
339 | |
229 | void |
340 | void |
230 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
341 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
231 | { |
342 | { |
… | |
… | |
238 | if (src == 0 || src > conns.size () |
349 | if (src == 0 || src > conns.size () |
239 | || dst > conns.size () |
350 | || dst > conns.size () |
240 | || pkt->typ () >= vpn_packet::PT_MAX) |
351 | || pkt->typ () >= vpn_packet::PT_MAX) |
241 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
352 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
242 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
353 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
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354 | else if (dst > conns.size ()) |
|
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355 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
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356 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
243 | else |
357 | else |
244 | { |
358 | { |
245 | connection *c = conns[src - 1]; |
359 | connection *c = conns[src - 1]; |
246 | |
360 | |
247 | if (dst == 0 && !THISNODE->routerprio) |
361 | if (dst == 0) |
248 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
362 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
249 | c->conf->nodename, (const char *)rsi); |
363 | c->conf->nodename, (const char *)rsi); |
250 | else if (dst != 0 && dst != THISNODE->id) |
364 | else if (dst != 0 && dst != THISNODE->id) |
251 | // FORWARDING NEEDED ;) |
365 | { |
|
|
366 | if (THISNODE->routerprio) |
|
|
367 | // the tos setting gets lost here. who cares. |
|
|
368 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
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369 | else |
252 | slog (L_WARN, |
370 | slog (L_WARN, |
253 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
371 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
|
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372 | c->conf->nodename, (const char *)rsi, |
254 | dst, conns[dst - 1]->conf->nodename, |
373 | conns[dst - 1]->conf->nodename); |
255 | (const char *)rsi, |
374 | } |
256 | THISNODE->id, THISNODE->nodename); |
|
|
257 | else |
375 | else |
258 | c->recv_vpn_packet (pkt, rsi); |
376 | c->recv_vpn_packet (pkt, rsi); |
259 | } |
377 | } |
260 | } |
378 | } |
261 | |
379 | |
262 | void |
380 | void |
263 | vpn::udpv4_ev (io_watcher &w, short revents) |
381 | vpn::ipv4_ev (io_watcher &w, short revents) |
264 | { |
382 | { |
265 | if (revents & (POLLIN | POLLERR)) |
383 | if (revents & (POLLIN | POLLERR)) |
266 | { |
384 | { |
267 | vpn_packet *pkt = new vpn_packet; |
385 | vpn_packet *pkt = new vpn_packet; |
268 | struct sockaddr_in sa; |
386 | struct sockaddr_in sa; |
269 | socklen_t sa_len = sizeof (sa); |
387 | socklen_t sa_len = sizeof (sa); |
270 | int len; |
388 | int len; |
271 | |
389 | |
272 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
390 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
273 | |
391 | |
274 | sockinfo si(sa, PROT_UDPv4); |
392 | sockinfo si(sa, PROT_IPv4); |
275 | |
393 | |
276 | if (len > 0) |
394 | if (len > 0) |
277 | { |
395 | { |
278 | pkt->len = len; |
396 | pkt->len = len; |
279 | |
397 | |
|
|
398 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
399 | // this is slow, but... |
|
|
400 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
401 | |
280 | recv_vpn_packet (pkt, si); |
402 | recv_vpn_packet (pkt, si); |
281 | } |
403 | } |
282 | else |
404 | else |
283 | { |
405 | { |
284 | // probably ECONNRESET or somesuch |
406 | // probably ECONNRESET or somesuch |
285 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
407 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
286 | } |
408 | } |
287 | |
409 | |
288 | delete pkt; |
410 | delete pkt; |
289 | } |
411 | } |
290 | else if (revents & POLLHUP) |
412 | else if (revents & POLLHUP) |
291 | { |
413 | { |
292 | // this cannot ;) happen on udp sockets |
414 | // this cannot ;) happen on udp sockets |
293 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
415 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
294 | exit (1); |
416 | exit (1); |
295 | } |
417 | } |
296 | else |
418 | else |
297 | { |
419 | { |
298 | slog (L_ERR, |
420 | slog (L_ERR, |
… | |
… | |
300 | revents); |
422 | revents); |
301 | exit (1); |
423 | exit (1); |
302 | } |
424 | } |
303 | } |
425 | } |
304 | |
426 | |
|
|
427 | #if ENABLE_ICMP |
305 | void |
428 | void |
306 | vpn::ipv4_ev (io_watcher &w, short revents) |
429 | vpn::icmpv4_ev (io_watcher &w, short revents) |
307 | { |
430 | { |
308 | if (revents & (POLLIN | POLLERR)) |
431 | if (revents & (POLLIN | POLLERR)) |
309 | { |
432 | { |
310 | vpn_packet *pkt = new vpn_packet; |
433 | vpn_packet *pkt = new vpn_packet; |
311 | struct sockaddr_in sa; |
434 | struct sockaddr_in sa; |
312 | socklen_t sa_len = sizeof (sa); |
435 | socklen_t sa_len = sizeof (sa); |
313 | int len; |
436 | int len; |
314 | |
437 | |
315 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
438 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
316 | |
439 | |
317 | sockinfo si(sa, PROT_IPv4); |
440 | sockinfo si(sa, PROT_ICMPv4); |
318 | |
441 | |
319 | if (len > 0) |
442 | if (len > 0) |
320 | { |
443 | { |
321 | pkt->len = len; |
444 | pkt->len = len; |
322 | |
445 | |
|
|
446 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
447 | |
|
|
448 | if (hdr->type == ::conf.icmp_type |
|
|
449 | && hdr->code == 255) |
|
|
450 | { |
323 | // raw sockets deliver the ipv4, but don't expect it on sends |
451 | // raw sockets deliver the ipv4, but don't expect it on sends |
324 | // this is slow, but... |
452 | // this is slow, but... |
325 | pkt->skip_hdr (IP_OVERHEAD); |
453 | pkt->skip_hdr (ICMP_OVERHEAD); |
326 | |
454 | |
327 | recv_vpn_packet (pkt, si); |
455 | recv_vpn_packet (pkt, si); |
|
|
456 | } |
328 | } |
457 | } |
329 | else |
458 | else |
330 | { |
459 | { |
331 | // probably ECONNRESET or somesuch |
460 | // probably ECONNRESET or somesuch |
332 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
461 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
… | |
… | |
335 | delete pkt; |
464 | delete pkt; |
336 | } |
465 | } |
337 | else if (revents & POLLHUP) |
466 | else if (revents & POLLHUP) |
338 | { |
467 | { |
339 | // this cannot ;) happen on udp sockets |
468 | // this cannot ;) happen on udp sockets |
340 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
469 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
341 | exit (1); |
470 | exit (1); |
342 | } |
471 | } |
343 | else |
472 | else |
344 | { |
473 | { |
345 | slog (L_ERR, |
474 | slog (L_ERR, |
346 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
475 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
347 | revents); |
476 | revents); |
348 | exit (1); |
477 | exit (1); |
349 | } |
478 | } |
350 | } |
479 | } |
|
|
480 | #endif |
|
|
481 | |
|
|
482 | void |
|
|
483 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
484 | { |
|
|
485 | if (revents & (POLLIN | POLLERR)) |
|
|
486 | { |
|
|
487 | vpn_packet *pkt = new vpn_packet; |
|
|
488 | struct sockaddr_in sa; |
|
|
489 | socklen_t sa_len = sizeof (sa); |
|
|
490 | int len; |
|
|
491 | |
|
|
492 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
493 | |
|
|
494 | sockinfo si(sa, PROT_UDPv4); |
|
|
495 | |
|
|
496 | if (len > 0) |
|
|
497 | { |
|
|
498 | pkt->len = len; |
|
|
499 | |
|
|
500 | recv_vpn_packet (pkt, si); |
|
|
501 | } |
|
|
502 | else |
|
|
503 | { |
|
|
504 | // probably ECONNRESET or somesuch |
|
|
505 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
506 | } |
|
|
507 | |
|
|
508 | delete pkt; |
|
|
509 | } |
|
|
510 | else if (revents & POLLHUP) |
|
|
511 | { |
|
|
512 | // this cannot ;) happen on udp sockets |
|
|
513 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
514 | exit (1); |
|
|
515 | } |
|
|
516 | else |
|
|
517 | { |
|
|
518 | slog (L_ERR, |
|
|
519 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
520 | revents); |
|
|
521 | exit (1); |
|
|
522 | } |
|
|
523 | } |
351 | |
524 | |
352 | void |
525 | void |
353 | vpn::tap_ev (io_watcher &w, short revents) |
526 | vpn::tap_ev (io_watcher &w, short revents) |
354 | { |
527 | { |
355 | if (revents & POLLIN) |
528 | if (revents & POLLIN) |
… | |
… | |
362 | int dst = mac2id (pkt->dst); |
535 | int dst = mac2id (pkt->dst); |
363 | int src = mac2id (pkt->src); |
536 | int src = mac2id (pkt->src); |
364 | |
537 | |
365 | if (src != THISNODE->id) |
538 | if (src != THISNODE->id) |
366 | { |
539 | { |
367 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
540 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
368 | exit (1); |
541 | exit (1); |
369 | } |
542 | } |
370 | |
543 | |
371 | if (dst == THISNODE->id) |
544 | if (dst == THISNODE->id) |
372 | { |
545 | { |
373 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
546 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
374 | exit (1); |
547 | exit (1); |
375 | } |
548 | } |
376 | |
549 | |
377 | if (dst > conns.size ()) |
550 | if (dst > conns.size ()) |
378 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
551 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
… | |
… | |
384 | if (dst != THISNODE->id) |
557 | if (dst != THISNODE->id) |
385 | conns[dst - 1]->inject_data_packet (pkt); |
558 | conns[dst - 1]->inject_data_packet (pkt); |
386 | } |
559 | } |
387 | else |
560 | else |
388 | { |
561 | { |
389 | // broadcast, first check router, then self, then english |
562 | // broadcast, this is ugly, but due to the security policy |
390 | connection *router = find_router (); |
563 | // we have to connect to all hosts... |
391 | |
|
|
392 | if (router) |
|
|
393 | router->inject_data_packet (pkt, true); |
|
|
394 | else |
|
|
395 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
564 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
396 | if ((*c)->conf != THISNODE) |
565 | if ((*c)->conf != THISNODE) |
397 | (*c)->inject_data_packet (pkt); |
566 | (*c)->inject_data_packet (pkt); |
398 | } |
567 | } |
399 | } |
568 | } |
400 | |
569 | |
401 | delete pkt; |
570 | delete pkt; |
402 | } |
571 | } |
… | |
… | |
469 | } |
638 | } |
470 | } |
639 | } |
471 | |
640 | |
472 | connection *vpn::find_router () |
641 | connection *vpn::find_router () |
473 | { |
642 | { |
474 | u32 prio = 0; |
643 | u32 prio = 1; |
475 | connection *router = 0; |
644 | connection *router = 0; |
476 | |
645 | |
477 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
646 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
478 | { |
647 | { |
479 | connection *c = *i; |
648 | connection *c = *i; |
480 | |
649 | |
481 | if (c->conf->routerprio > prio |
650 | if (c->conf->routerprio > prio |
482 | && c->connectmode == conf_node::C_ALWAYS |
651 | && 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) |
652 | && c->ictx && c->octx |
|
|
653 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
485 | { |
654 | { |
486 | prio = c->conf->routerprio; |
655 | prio = c->conf->routerprio; |
487 | router = c; |
656 | router = c; |
488 | } |
657 | } |
489 | } |
658 | } |
490 | |
659 | |
491 | return router; |
660 | return router; |
492 | } |
661 | } |
493 | |
662 | |
494 | void vpn::connect_request (int id) |
663 | void vpn::send_connect_request (int id) |
495 | { |
664 | { |
496 | connection *c = find_router (); |
665 | connection *c = find_router (); |
497 | |
666 | |
498 | if (c) |
667 | if (c) |
499 | c->connect_request (id); |
668 | c->send_connect_request (id); |
500 | //else // does not work, because all others must connect to the same router |
669 | else |
501 | // // no router found, aggressively connect to all routers |
670 | // no router found, aggressively connect to all routers |
502 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
671 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
503 | // if ((*i)->conf->routerprio) |
672 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
504 | // (*i)->establish_connection (); |
673 | (*i)->establish_connection (); |
505 | } |
674 | } |
506 | |
675 | |
507 | void |
676 | void |
508 | connection::dump_status () |
677 | connection::dump_status () |
509 | { |
678 | { |
… | |
… | |
526 | |
695 | |
527 | slog (L_NOTICE, _("END status dump")); |
696 | slog (L_NOTICE, _("END status dump")); |
528 | } |
697 | } |
529 | |
698 | |
530 | vpn::vpn (void) |
699 | vpn::vpn (void) |
531 | : event(this, &vpn::event_cb) |
700 | : event (this, &vpn::event_cb) |
532 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
701 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
533 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
702 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
534 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
535 | #if ENABLE_TCP |
703 | #if ENABLE_TCP |
536 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
704 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
537 | #endif |
705 | #endif |
|
|
706 | #if ENABLE_ICMP |
|
|
707 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
708 | #endif |
|
|
709 | , tap_ev_watcher (this, &vpn::tap_ev) |
538 | { |
710 | { |
539 | } |
711 | } |
540 | |
712 | |
541 | vpn::~vpn () |
713 | vpn::~vpn () |
542 | { |
714 | { |