… | |
… | |
24 | #include <cstring> |
24 | #include <cstring> |
25 | #include <cstdio> |
25 | #include <cstdio> |
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> |
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|
30 | #include <sys/wait.h> |
29 | #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> |
30 | #include <errno.h> |
34 | #include <time.h> |
31 | #include <time.h> |
35 | #include <unistd.h> |
32 | #include <unistd.h> |
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33 | #include <fcntl.h> |
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34 | #include <sys/socket.h> |
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35 | |
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36 | #include "netcompat.h" |
36 | |
37 | |
37 | #include "pidfile.h" |
38 | #include "pidfile.h" |
38 | |
39 | |
39 | #include "connection.h" |
40 | #include "connection.h" |
40 | #include "util.h" |
41 | #include "util.h" |
41 | #include "vpn.h" |
42 | #include "vpn.h" |
42 | |
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43 | #if ENABLE_TCP |
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44 | # include <map> |
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45 | # include <unistd.h> |
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46 | # include <fcntl.h> |
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47 | # include <sys/poll.h> |
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48 | #endif |
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49 | |
43 | |
50 | ///////////////////////////////////////////////////////////////////////////// |
44 | ///////////////////////////////////////////////////////////////////////////// |
51 | |
45 | |
52 | const char *vpn::script_if_up () |
46 | const char *vpn::script_if_up () |
53 | { |
47 | { |
… | |
… | |
78 | } |
72 | } |
79 | |
73 | |
80 | int |
74 | int |
81 | vpn::setup () |
75 | vpn::setup () |
82 | { |
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 |
|
|
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 (1); |
|
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104 | } |
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105 | |
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106 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
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107 | } |
|
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108 | |
83 | udpv4_fd = -1; |
109 | udpv4_fd = -1; |
84 | |
110 | |
85 | if (THISNODE->protocols & PROT_UDPv4) |
111 | if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) |
86 | { |
112 | { |
87 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
113 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
88 | |
114 | |
89 | if (udpv4_fd < 0) |
115 | if (udpv4_fd < 0) |
90 | return -1; |
116 | return -1; |
|
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117 | |
|
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118 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
91 | |
119 | |
92 | // standard daemon practise... |
120 | // standard daemon practise... |
93 | { |
121 | { |
94 | int oval = 1; |
122 | int oval = 1; |
95 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
123 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
96 | } |
124 | } |
97 | |
125 | |
98 | sockinfo si (THISNODE, PROT_UDPv4); |
126 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
99 | |
|
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100 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
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101 | { |
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102 | slog (L_ERR, _("can't bind udpv4 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 | |
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106 | #ifdef IP_MTU_DISCOVER |
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107 | // this I really consider a linux bug. I am neither connected |
127 | // this I really consider a linux bug. I am neither connected |
108 | // 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 |
109 | // fragment for me sometimes. |
129 | // fragment for me sometimes. |
110 | { |
130 | { |
111 | int oval = IP_PMTUDISC_DONT; |
131 | int oval = IP_PMTUDISC_DONT; |
112 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
132 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
113 | } |
133 | } |
114 | #endif |
134 | #endif |
115 | |
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 | |
116 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
144 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
117 | } |
145 | } |
118 | |
146 | |
119 | ipv4_fd = -1; |
147 | icmpv4_fd = -1; |
|
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148 | |
|
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149 | #if ENABLE_ICMP |
120 | if (THISNODE->protocols & PROT_IPv4) |
150 | if (THISNODE->protocols & PROT_ICMPv4) |
121 | { |
151 | { |
122 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
152 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
123 | |
153 | |
124 | if (ipv4_fd < 0) |
154 | if (icmpv4_fd < 0) |
125 | return -1; |
155 | return -1; |
126 | |
156 | |
127 | sockinfo si (THISNODE, PROT_IPv4); |
157 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
128 | |
158 | |
129 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
159 | #ifdef ICMP_FILTER |
130 | { |
160 | { |
131 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
161 | icmp_filter oval; |
132 | 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); |
133 | } |
167 | } |
|
|
168 | #endif |
134 | |
169 | |
135 | #ifdef IP_MTU_DISCOVER |
170 | #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) |
136 | // this I really consider a linux bug. I am neither connected |
171 | // this I really consider a linux bug. I am neither connected |
137 | // 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 |
138 | // fragment for me sometimes. |
173 | // fragment for me sometimes. |
139 | { |
174 | { |
140 | int oval = IP_PMTUDISC_DONT; |
175 | int oval = IP_PMTUDISC_DONT; |
141 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
176 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
142 | } |
177 | } |
143 | #endif |
178 | #endif |
144 | |
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 | |
145 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
188 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
146 | } |
189 | } |
|
|
190 | #endif |
|
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191 | |
|
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192 | tcpv4_fd = -1; |
147 | |
193 | |
148 | #if ENABLE_TCP |
194 | #if ENABLE_TCP |
149 | if (THISNODE->protocols & PROT_TCPv4) |
195 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
150 | { |
196 | { |
151 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
197 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
152 | |
198 | |
153 | if (tcpv4_fd < 0) |
199 | if (tcpv4_fd < 0) |
154 | return -1; |
200 | return -1; |
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201 | |
|
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202 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
155 | |
203 | |
156 | // standard daemon practise... |
204 | // standard daemon practise... |
157 | { |
205 | { |
158 | int oval = 1; |
206 | int oval = 1; |
159 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
207 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
191 | reconnect_all (); |
239 | reconnect_all (); |
192 | |
240 | |
193 | return 0; |
241 | return 0; |
194 | } |
242 | } |
195 | |
243 | |
196 | void |
244 | // send a vpn packet out to other hosts |
|
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245 | bool |
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246 | vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
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247 | { |
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248 | switch (si.prot) |
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249 | { |
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250 | case PROT_IPv4: |
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251 | return send_ipv4_packet (pkt, si, tos); |
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252 | |
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253 | case PROT_UDPv4: |
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254 | return send_udpv4_packet (pkt, si, tos); |
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255 | |
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256 | #if ENABLE_TCP |
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257 | case PROT_TCPv4: |
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258 | return send_tcpv4_packet (pkt, si, tos); |
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259 | #endif |
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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 | |
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266 | default: |
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267 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
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268 | return false; |
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269 | } |
|
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270 | } |
|
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271 | |
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272 | bool |
197 | 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) |
198 | { |
274 | { |
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275 | #if defined(SOL_IP) && defined(IP_TOS) |
199 | 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 |
200 | 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 ()); |
201 | } |
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202 | |
279 | |
203 | void |
280 | return true; |
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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 |
|
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327 | |
|
|
328 | bool |
204 | 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) |
205 | { |
330 | { |
|
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331 | #if defined(SOL_IP) && defined(IP_TOS) |
206 | 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 |
207 | 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 ()); |
|
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335 | |
|
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336 | return true; |
|
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337 | } |
|
|
338 | |
|
|
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 |
|
|
349 | { |
|
|
350 | // broadcast, this is ugly, but due to the security policy |
|
|
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 | } |
208 | } |
356 | } |
209 | |
357 | |
210 | void |
358 | void |
211 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
359 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
212 | { |
360 | { |
… | |
… | |
219 | if (src == 0 || src > conns.size () |
367 | if (src == 0 || src > conns.size () |
220 | || dst > conns.size () |
368 | || dst > conns.size () |
221 | || pkt->typ () >= vpn_packet::PT_MAX) |
369 | || pkt->typ () >= vpn_packet::PT_MAX) |
222 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
370 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
223 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
371 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
372 | else if (dst > conns.size ()) |
|
|
373 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
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374 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
224 | else |
375 | else |
225 | { |
376 | { |
226 | connection *c = conns[src - 1]; |
377 | connection *c = conns[src - 1]; |
227 | |
378 | |
228 | if (dst == 0 && !THISNODE->routerprio) |
379 | if (dst == 0) |
229 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
380 | slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), |
230 | c->conf->nodename, (const char *)rsi); |
381 | c->conf->nodename, (const char *)rsi); |
231 | else if (dst != 0 && dst != THISNODE->id) |
382 | else if (dst != THISNODE->id) |
232 | // FORWARDING NEEDED ;) |
383 | { |
|
|
384 | if (THISNODE->routerprio) |
|
|
385 | // the tos setting gets lost here. who cares. |
|
|
386 | conns[dst - 1]->inject_vpn_packet (pkt); |
|
|
387 | else |
233 | slog (L_WARN, |
388 | slog (L_WARN, |
234 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
389 | _("%s(%s): forwarding request (=> %s), but we are no router"), |
|
|
390 | c->conf->nodename, (const char *)rsi, |
235 | dst, conns[dst - 1]->conf->nodename, |
391 | conns[dst - 1]->conf->nodename); |
236 | (const char *)rsi, |
392 | } |
237 | THISNODE->id, THISNODE->nodename); |
|
|
238 | else |
393 | else |
239 | c->recv_vpn_packet (pkt, rsi); |
394 | c->recv_vpn_packet (pkt, rsi); |
240 | } |
395 | } |
241 | } |
396 | } |
242 | |
397 | |
243 | void |
398 | void |
244 | vpn::udpv4_ev (io_watcher &w, short revents) |
399 | vpn::ipv4_ev (io_watcher &w, short revents) |
245 | { |
400 | { |
246 | if (revents & (POLLIN | POLLERR)) |
401 | if (revents & (POLLIN | POLLERR)) |
247 | { |
402 | { |
248 | vpn_packet *pkt = new vpn_packet; |
403 | vpn_packet *pkt = new vpn_packet; |
249 | struct sockaddr_in sa; |
404 | struct sockaddr_in sa; |
250 | socklen_t sa_len = sizeof (sa); |
405 | socklen_t sa_len = sizeof (sa); |
251 | int len; |
406 | int len; |
252 | |
407 | |
253 | len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
408 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
254 | |
409 | |
255 | sockinfo si(sa); |
410 | sockinfo si(sa, PROT_IPv4); |
256 | |
411 | |
257 | if (len > 0) |
412 | if (len > 0) |
258 | { |
413 | { |
259 | pkt->len = len; |
414 | pkt->len = len; |
|
|
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); |
260 | |
419 | |
261 | recv_vpn_packet (pkt, si); |
420 | recv_vpn_packet (pkt, si); |
262 | } |
421 | } |
263 | else |
422 | else |
264 | { |
423 | { |
… | |
… | |
269 | delete pkt; |
428 | delete pkt; |
270 | } |
429 | } |
271 | else if (revents & POLLHUP) |
430 | else if (revents & POLLHUP) |
272 | { |
431 | { |
273 | // this cannot ;) happen on udp sockets |
432 | // this cannot ;) happen on udp sockets |
274 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
433 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
275 | exit (1); |
434 | exit (1); |
276 | } |
435 | } |
277 | else |
436 | else |
278 | { |
437 | { |
279 | slog (L_ERR, |
438 | slog (L_ERR, |
… | |
… | |
281 | revents); |
440 | revents); |
282 | exit (1); |
441 | exit (1); |
283 | } |
442 | } |
284 | } |
443 | } |
285 | |
444 | |
|
|
445 | #if ENABLE_ICMP |
286 | void |
446 | void |
287 | vpn::ipv4_ev (io_watcher &w, short revents) |
447 | vpn::icmpv4_ev (io_watcher &w, short revents) |
288 | { |
448 | { |
289 | if (revents & (POLLIN | POLLERR)) |
449 | if (revents & (POLLIN | POLLERR)) |
290 | { |
450 | { |
291 | vpn_packet *pkt = new vpn_packet; |
451 | vpn_packet *pkt = new vpn_packet; |
292 | struct sockaddr_in sa; |
452 | struct sockaddr_in sa; |
293 | socklen_t sa_len = sizeof (sa); |
453 | socklen_t sa_len = sizeof (sa); |
294 | int len; |
454 | int len; |
295 | |
455 | |
296 | len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
456 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
297 | |
457 | |
298 | sockinfo si(sa, PROT_IPv4); |
458 | sockinfo si(sa, PROT_ICMPv4); |
299 | |
459 | |
300 | if (len > 0) |
460 | if (len > 0) |
301 | { |
461 | { |
302 | pkt->len = len; |
462 | pkt->len = len; |
303 | |
463 | |
|
|
464 | icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); |
|
|
465 | |
|
|
466 | if (hdr->type == ::conf.icmp_type |
|
|
467 | && hdr->code == 255) |
|
|
468 | { |
304 | // raw sockets deliver the ipv4, but don't expect it on sends |
469 | // raw sockets deliver the ipv4, but don't expect it on sends |
305 | // this is slow, but... |
470 | // this is slow, but... |
306 | pkt->skip_hdr (IP_OVERHEAD); |
471 | pkt->skip_hdr (ICMP_OVERHEAD); |
307 | |
472 | |
308 | recv_vpn_packet (pkt, si); |
473 | recv_vpn_packet (pkt, si); |
|
|
474 | } |
309 | } |
475 | } |
310 | else |
476 | else |
311 | { |
477 | { |
312 | // probably ECONNRESET or somesuch |
478 | // probably ECONNRESET or somesuch |
313 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
479 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
… | |
… | |
316 | delete pkt; |
482 | delete pkt; |
317 | } |
483 | } |
318 | else if (revents & POLLHUP) |
484 | else if (revents & POLLHUP) |
319 | { |
485 | { |
320 | // this cannot ;) happen on udp sockets |
486 | // this cannot ;) happen on udp sockets |
321 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
487 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
322 | exit (1); |
488 | exit (1); |
323 | } |
489 | } |
324 | else |
490 | else |
325 | { |
491 | { |
326 | slog (L_ERR, |
492 | slog (L_ERR, |
327 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
493 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
328 | revents); |
494 | revents); |
329 | exit (1); |
495 | exit (1); |
330 | } |
496 | } |
331 | } |
497 | } |
|
|
498 | #endif |
332 | |
499 | |
333 | #if ENABLE_TCP |
500 | void |
334 | |
|
|
335 | struct tcp_connection; |
|
|
336 | |
|
|
337 | struct lt_sockinfo |
|
|
338 | { |
|
|
339 | bool operator()(const sockinfo *a, const sockinfo *b) const |
|
|
340 | { |
|
|
341 | return *a < *b; |
|
|
342 | } |
|
|
343 | }; |
|
|
344 | |
|
|
345 | struct tcp_si_map : public map<const sockinfo *, tcp_connection *, lt_sockinfo> { |
|
|
346 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
|
|
347 | |
|
|
348 | tcp_si_map () |
|
|
349 | : cleaner(this, &tcp_si_map::cleaner_cb) |
|
|
350 | { |
|
|
351 | cleaner.start (0); |
|
|
352 | } |
|
|
353 | } tcp_si; |
|
|
354 | |
|
|
355 | struct tcp_connection : io_watcher { |
|
|
356 | tstamp last_activity; |
|
|
357 | const sockinfo si; |
|
|
358 | vpn &v; |
|
|
359 | bool ok; |
|
|
360 | |
|
|
361 | vpn_packet *r_pkt; |
|
|
362 | u32 r_len, r_ofs; |
|
|
363 | |
|
|
364 | void tcpv4_ev (io_watcher &w, short revents); |
501 | vpn::udpv4_ev (io_watcher &w, short revents) |
365 | |
|
|
366 | operator tcp_si_map::value_type() |
|
|
367 | { |
|
|
368 | return tcp_si_map::value_type (&si, this); |
|
|
369 | } |
|
|
370 | |
|
|
371 | tcp_connection (int fd, const sockinfo &si_, vpn &v_) |
|
|
372 | : v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev) |
|
|
373 | { |
|
|
374 | last_activity = NOW; |
|
|
375 | ok = false; |
|
|
376 | r_pkt = 0; |
|
|
377 | start (fd, POLLOUT); |
|
|
378 | } |
|
|
379 | |
|
|
380 | ~tcp_connection () { if (p) close (p->fd); } |
|
|
381 | }; |
|
|
382 | |
|
|
383 | void tcp_si_map::cleaner_cb (time_watcher &w) |
|
|
384 | { |
502 | { |
385 | w.at = NOW + 600; |
|
|
386 | tstamp to = NOW - ::conf.keepalive - 30; |
|
|
387 | |
|
|
388 | for (iterator i = begin (); i != end(); ) |
|
|
389 | if (i->second->last_activity >= to) |
|
|
390 | ++i; |
|
|
391 | else |
|
|
392 | { |
|
|
393 | erase (i); |
|
|
394 | i = begin (); |
|
|
395 | } |
|
|
396 | } |
|
|
397 | |
|
|
398 | void |
|
|
399 | vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
400 | { |
|
|
401 | tcp_si_map::iterator info = tcp_si.find (&si); |
|
|
402 | |
|
|
403 | if (info == tcp_si.end ()) |
|
|
404 | { |
|
|
405 | // woaw, the first lost packet ;) |
|
|
406 | int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
|
|
407 | |
|
|
408 | if (fd >= 0) |
|
|
409 | { |
|
|
410 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
411 | |
|
|
412 | if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0 |
|
|
413 | || errno == EINPROGRESS) |
|
|
414 | { |
|
|
415 | tcp_connection *i = new tcp_connection (fd, si, *this); |
|
|
416 | |
|
|
417 | tcp_si.insert (*i); |
|
|
418 | } |
|
|
419 | else |
|
|
420 | close (fd); |
|
|
421 | } |
|
|
422 | } |
|
|
423 | else |
|
|
424 | { |
|
|
425 | tcp_connection *i = info->second; |
|
|
426 | |
|
|
427 | i->last_activity = NOW; |
|
|
428 | |
|
|
429 | if (i->ok) |
|
|
430 | { |
|
|
431 | setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
432 | |
|
|
433 | // we use none of the advantages of tcp |
|
|
434 | write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32); |
|
|
435 | } |
|
|
436 | } |
|
|
437 | |
|
|
438 | #if 0 |
|
|
439 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
440 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
441 | #endif |
|
|
442 | } |
|
|
443 | |
|
|
444 | void |
|
|
445 | tcp_connection::tcpv4_ev (io_watcher &w, short revents) |
|
|
446 | { |
|
|
447 | last_activity = NOW; |
|
|
448 | |
|
|
449 | if (!ok) // just established? |
|
|
450 | { |
|
|
451 | ok = true; |
|
|
452 | set (POLLIN); |
|
|
453 | } |
|
|
454 | |
|
|
455 | if (revents & (POLLIN | POLLERR)) |
503 | if (revents & (POLLIN | POLLERR)) |
456 | { |
504 | { |
457 | u32 len; |
|
|
458 | |
|
|
459 | if (sizeof (len) == read (p->fd, &len, sizeof (len))) |
|
|
460 | { |
|
|
461 | vpn_packet *pkt = new vpn_packet; |
505 | vpn_packet *pkt = new vpn_packet; |
462 | |
|
|
463 | if (len == read (p->fd, &((*pkt)[0]), len)) |
|
|
464 | { |
|
|
465 | pkt->len = len; |
|
|
466 | |
|
|
467 | v.recv_vpn_packet (pkt, si); |
|
|
468 | return; |
|
|
469 | } |
|
|
470 | |
|
|
471 | delete pkt; |
|
|
472 | } |
|
|
473 | |
|
|
474 | tcp_si.erase (&si); |
|
|
475 | |
|
|
476 | set (0);//D |
|
|
477 | } |
|
|
478 | } |
|
|
479 | |
|
|
480 | void |
|
|
481 | vpn::tcpv4_ev (io_watcher &w, short revents) |
|
|
482 | { |
|
|
483 | if (revents & (POLLIN | POLLERR)) |
|
|
484 | { |
|
|
485 | struct sockaddr_in sa; |
506 | struct sockaddr_in sa; |
486 | socklen_t sa_len = sizeof (sa); |
507 | socklen_t sa_len = sizeof (sa); |
487 | int len; |
508 | int len; |
488 | |
509 | |
489 | int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len); |
510 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
490 | |
511 | |
491 | if (fd >= 0) |
|
|
492 | { |
|
|
493 | fcntl (fd, F_SETFL, O_NONBLOCK); |
|
|
494 | |
|
|
495 | sockinfo si(sa, PROT_TCPv4); |
512 | sockinfo si(sa, PROT_UDPv4); |
496 | tcp_connection *i = new tcp_connection (fd, si, *this); |
|
|
497 | |
513 | |
498 | slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D |
514 | if (len > 0) |
499 | |
|
|
500 | tcp_si.insert (*i); |
|
|
501 | } |
515 | { |
|
|
516 | pkt->len = len; |
|
|
517 | |
|
|
518 | recv_vpn_packet (pkt, si); |
|
|
519 | } |
|
|
520 | else |
|
|
521 | { |
|
|
522 | // probably ECONNRESET or somesuch |
|
|
523 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
524 | } |
|
|
525 | |
|
|
526 | delete pkt; |
|
|
527 | } |
|
|
528 | else if (revents & POLLHUP) |
502 | } |
529 | { |
|
|
530 | // this cannot ;) happen on udp sockets |
|
|
531 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
532 | exit (1); |
|
|
533 | } |
|
|
534 | else |
|
|
535 | { |
|
|
536 | slog (L_ERR, |
|
|
537 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
538 | revents); |
|
|
539 | exit (1); |
|
|
540 | } |
503 | } |
541 | } |
504 | |
|
|
505 | #endif |
|
|
506 | |
542 | |
507 | void |
543 | void |
508 | vpn::tap_ev (io_watcher &w, short revents) |
544 | vpn::tap_ev (io_watcher &w, short revents) |
509 | { |
545 | { |
510 | if (revents & POLLIN) |
546 | if (revents & POLLIN) |
… | |
… | |
512 | /* process data */ |
548 | /* process data */ |
513 | tap_packet *pkt; |
549 | tap_packet *pkt; |
514 | |
550 | |
515 | pkt = tap->recv (); |
551 | pkt = tap->recv (); |
516 | |
552 | |
|
|
553 | if (!pkt) |
|
|
554 | return; |
|
|
555 | |
|
|
556 | if (pkt->len > 14) |
|
|
557 | { |
517 | int dst = mac2id (pkt->dst); |
558 | int dst = mac2id (pkt->dst); |
518 | int src = mac2id (pkt->src); |
559 | int src = mac2id (pkt->src); |
519 | |
560 | |
520 | if (src != THISNODE->id) |
561 | if (src != THISNODE->id) |
521 | { |
|
|
522 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
523 | exit (1); |
|
|
524 | } |
|
|
525 | |
|
|
526 | if (dst == THISNODE->id) |
|
|
527 | { |
|
|
528 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
529 | exit (1); |
|
|
530 | } |
|
|
531 | |
|
|
532 | if (dst > conns.size ()) |
|
|
533 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
534 | else |
|
|
535 | { |
|
|
536 | if (dst) |
|
|
537 | { |
562 | { |
538 | // unicast |
563 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); |
539 | if (dst != THISNODE->id) |
564 | exit (1); |
540 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
541 | } |
565 | } |
|
|
566 | |
|
|
567 | if (dst == THISNODE->id) |
|
|
568 | { |
|
|
569 | slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); |
|
|
570 | exit (1); |
|
|
571 | } |
|
|
572 | |
|
|
573 | if (dst > conns.size ()) |
|
|
574 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
542 | else |
575 | else |
543 | { |
|
|
544 | // broadcast, first check router, then self, then english |
|
|
545 | connection *router = find_router (); |
|
|
546 | |
|
|
547 | if (router) |
|
|
548 | router->inject_data_packet (pkt, true); |
576 | inject_data_packet (pkt, dst); |
549 | else |
|
|
550 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
551 | if ((*c)->conf != THISNODE) |
|
|
552 | (*c)->inject_data_packet (pkt); |
|
|
553 | } |
|
|
554 | } |
577 | } |
555 | |
578 | |
556 | delete pkt; |
579 | delete pkt; |
557 | } |
580 | } |
558 | else if (revents & (POLLHUP | POLLERR)) |
581 | else if (revents & (POLLHUP | POLLERR)) |
… | |
… | |
624 | } |
647 | } |
625 | } |
648 | } |
626 | |
649 | |
627 | connection *vpn::find_router () |
650 | connection *vpn::find_router () |
628 | { |
651 | { |
629 | u32 prio = 0; |
652 | u32 prio = 1; |
630 | connection *router = 0; |
653 | connection *router = 0; |
631 | |
654 | |
632 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
655 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
633 | { |
656 | { |
634 | connection *c = *i; |
657 | connection *c = *i; |
635 | |
658 | |
636 | if (c->conf->routerprio > prio |
659 | if (c->conf->routerprio > prio |
637 | && c->connectmode == conf_node::C_ALWAYS |
660 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
638 | && c->conf != THISNODE |
|
|
639 | && c->ictx && c->octx) |
661 | && c->ictx && c->octx |
|
|
662 | && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode |
640 | { |
663 | { |
641 | prio = c->conf->routerprio; |
664 | prio = c->conf->routerprio; |
642 | router = c; |
665 | router = c; |
643 | } |
666 | } |
644 | } |
667 | } |
645 | |
668 | |
646 | return router; |
669 | return router; |
647 | } |
670 | } |
648 | |
671 | |
649 | void vpn::connect_request (int id) |
672 | void vpn::send_connect_request (int id) |
650 | { |
673 | { |
651 | connection *c = find_router (); |
674 | connection *c = find_router (); |
652 | |
675 | |
653 | if (c) |
676 | if (c) |
654 | c->connect_request (id); |
677 | c->send_connect_request (id); |
655 | //else // does not work, because all others must connect to the same router |
678 | else |
656 | // // no router found, aggressively connect to all routers |
679 | // no router found, aggressively connect to all routers |
657 | // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
680 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
658 | // if ((*i)->conf->routerprio) |
681 | if ((*i)->conf->routerprio && (*i)->conf != THISNODE) |
659 | // (*i)->establish_connection (); |
682 | (*i)->establish_connection (); |
660 | } |
683 | } |
661 | |
684 | |
662 | void |
685 | void |
663 | connection::dump_status () |
686 | connection::dump_status () |
664 | { |
687 | { |
… | |
… | |
681 | |
704 | |
682 | slog (L_NOTICE, _("END status dump")); |
705 | slog (L_NOTICE, _("END status dump")); |
683 | } |
706 | } |
684 | |
707 | |
685 | vpn::vpn (void) |
708 | vpn::vpn (void) |
686 | : event(this, &vpn::event_cb) |
709 | : event (this, &vpn::event_cb) |
687 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
710 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
688 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
711 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
689 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
690 | #if ENABLE_TCP |
712 | #if ENABLE_TCP |
691 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
713 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
692 | #endif |
714 | #endif |
|
|
715 | #if ENABLE_ICMP |
|
|
716 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
717 | #endif |
|
|
718 | , tap_ev_watcher (this, &vpn::tap_ev) |
693 | { |
719 | { |
694 | } |
720 | } |
695 | |
721 | |
696 | vpn::~vpn () |
722 | vpn::~vpn () |
697 | { |
723 | { |