… | |
… | |
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> |
|
|
32 | #include <arpa/inet.h> |
|
|
33 | #include <errno.h> |
31 | #include <errno.h> |
34 | #include <time.h> |
32 | #include <time.h> |
35 | #include <unistd.h> |
33 | #include <unistd.h> |
|
|
34 | #include <fcntl.h> |
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|
35 | #include <arpa/inet.h> |
|
|
36 | #include <netinet/in.h> |
|
|
37 | #include <netinet/ip_icmp.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" |
… | |
… | |
80 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
82 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
81 | |
83 | |
82 | if (ipv4_fd < 0) |
84 | if (ipv4_fd < 0) |
83 | return -1; |
85 | return -1; |
84 | |
86 | |
85 | sockinfo si (THISNODE, PROT_IPv4); |
87 | fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); |
86 | |
|
|
87 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
88 | { |
|
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89 | slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); |
|
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90 | exit (1); |
|
|
91 | } |
|
|
92 | |
88 | |
93 | #ifdef IP_MTU_DISCOVER |
89 | #ifdef IP_MTU_DISCOVER |
94 | // this I really consider a linux bug. I am neither connected |
90 | // this I really consider a linux bug. I am neither connected |
95 | // nor do I fragment myself. Linux still sets DF and doesn't |
91 | // nor do I fragment myself. Linux still sets DF and doesn't |
96 | // fragment for me sometimes. |
92 | // fragment for me sometimes. |
… | |
… | |
98 | int oval = IP_PMTUDISC_DONT; |
94 | int oval = IP_PMTUDISC_DONT; |
99 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
95 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
100 | } |
96 | } |
101 | #endif |
97 | #endif |
102 | |
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 | |
103 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
107 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
104 | } |
108 | } |
105 | |
109 | |
106 | udpv4_fd = -1; |
110 | udpv4_fd = -1; |
107 | |
111 | |
… | |
… | |
109 | { |
113 | { |
110 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
114 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
111 | |
115 | |
112 | if (udpv4_fd < 0) |
116 | if (udpv4_fd < 0) |
113 | return -1; |
117 | return -1; |
|
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118 | |
|
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119 | fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); |
114 | |
120 | |
115 | // standard daemon practise... |
121 | // standard daemon practise... |
116 | { |
122 | { |
117 | int oval = 1; |
123 | int oval = 1; |
118 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
124 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
119 | } |
125 | } |
120 | |
|
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121 | sockinfo si (THISNODE, PROT_UDPv4); |
|
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122 | |
|
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123 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
|
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124 | { |
|
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125 | slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); |
|
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126 | exit (1); |
|
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127 | } |
|
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128 | |
126 | |
129 | #ifdef IP_MTU_DISCOVER |
127 | #ifdef IP_MTU_DISCOVER |
130 | // this I really consider a linux bug. I am neither connected |
128 | // this I really consider a linux bug. I am neither connected |
131 | // 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 |
132 | // fragment for me sometimes. |
130 | // fragment for me sometimes. |
… | |
… | |
134 | int oval = IP_PMTUDISC_DONT; |
132 | int oval = IP_PMTUDISC_DONT; |
135 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
133 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
136 | } |
134 | } |
137 | #endif |
135 | #endif |
138 | |
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 | |
139 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
145 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
140 | } |
146 | } |
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147 | |
|
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148 | icmpv4_fd = -1; |
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149 | |
|
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150 | #if ENABLE_ICMP |
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151 | if (THISNODE->protocols & PROT_ICMPv4) |
|
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152 | { |
|
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153 | icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); |
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154 | |
|
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155 | if (icmpv4_fd < 0) |
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156 | return -1; |
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157 | |
|
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158 | fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); |
|
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159 | |
|
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160 | #ifdef ICMP_FILTER |
|
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161 | { |
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162 | icmp_filter oval; |
|
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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); |
|
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168 | } |
|
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169 | #endif |
|
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170 | |
|
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171 | #ifdef IP_MTU_DISCOVER |
|
|
172 | // this I really consider a linux bug. I am neither connected |
|
|
173 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
174 | // fragment for me sometimes. |
|
|
175 | { |
|
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176 | int oval = IP_PMTUDISC_DONT; |
|
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177 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
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178 | } |
|
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179 | #endif |
|
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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 | |
|
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189 | icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); |
|
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190 | } |
|
|
191 | #endif |
141 | |
192 | |
142 | tcpv4_fd = -1; |
193 | tcpv4_fd = -1; |
143 | |
194 | |
144 | #if ENABLE_TCP |
195 | #if ENABLE_TCP |
145 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
196 | if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) |
146 | { |
197 | { |
147 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
198 | tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); |
148 | |
199 | |
149 | if (tcpv4_fd < 0) |
200 | if (tcpv4_fd < 0) |
150 | return -1; |
201 | return -1; |
|
|
202 | |
|
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203 | fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); |
151 | |
204 | |
152 | // standard daemon practise... |
205 | // standard daemon practise... |
153 | { |
206 | { |
154 | int oval = 1; |
207 | int oval = 1; |
155 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
208 | setsockopt (tcpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
… | |
… | |
204 | #if ENABLE_TCP |
257 | #if ENABLE_TCP |
205 | case PROT_TCPv4: |
258 | case PROT_TCPv4: |
206 | return send_tcpv4_packet (pkt, si, tos); |
259 | return send_tcpv4_packet (pkt, si, tos); |
207 | #endif |
260 | #endif |
208 | |
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); |
|
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265 | #endif |
|
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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 | return false; |
269 | return false; |
212 | } |
270 | } |
213 | } |
271 | } |
… | |
… | |
215 | bool |
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 | { |
218 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
276 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
219 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
277 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
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278 | |
|
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279 | return true; |
|
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280 | } |
|
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281 | |
|
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282 | static u16 |
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283 | ipv4_checksum (u16 *data, unsigned int len) |
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284 | { |
|
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285 | // use 32 bit accumulator and fold back carry bits at the end |
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286 | u32 sum = 0; |
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287 | |
|
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288 | while (len > 1) |
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289 | { |
|
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290 | sum += *data++; |
|
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291 | len -= 2; |
|
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292 | } |
|
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293 | |
|
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294 | // odd byte left? |
|
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295 | if (len) |
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296 | sum += *(u8 *)data; |
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297 | |
|
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298 | // add back carry bits |
|
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299 | sum = (sum >> 16) + (sum & 0xffff); // lo += hi |
|
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300 | sum += (sum >> 16); // carry |
|
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301 | |
|
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302 | return ~sum; |
|
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303 | } |
|
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304 | |
|
|
305 | bool |
|
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306 | vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
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307 | { |
|
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308 | setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
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309 | |
|
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310 | pkt->unshift_hdr (4); |
|
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311 | |
|
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312 | icmphdr *hdr = (icmphdr *)&((*pkt)[0]); |
|
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313 | hdr->type = ::conf.icmp_type; |
|
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314 | hdr->code = 255; |
|
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315 | hdr->checksum = 0; |
|
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316 | hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); |
|
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317 | |
|
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318 | sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
220 | |
319 | |
221 | return true; |
320 | return true; |
222 | } |
321 | } |
223 | |
322 | |
224 | bool |
323 | bool |
… | |
… | |
269 | c->recv_vpn_packet (pkt, rsi); |
368 | c->recv_vpn_packet (pkt, rsi); |
270 | } |
369 | } |
271 | } |
370 | } |
272 | |
371 | |
273 | void |
372 | void |
274 | vpn::udpv4_ev (io_watcher &w, short revents) |
373 | vpn::ipv4_ev (io_watcher &w, short revents) |
275 | { |
374 | { |
276 | if (revents & (POLLIN | POLLERR)) |
375 | if (revents & (POLLIN | POLLERR)) |
277 | { |
376 | { |
278 | vpn_packet *pkt = new vpn_packet; |
377 | vpn_packet *pkt = new vpn_packet; |
279 | struct sockaddr_in sa; |
378 | struct sockaddr_in sa; |
280 | socklen_t sa_len = sizeof (sa); |
379 | socklen_t sa_len = sizeof (sa); |
281 | int len; |
380 | int len; |
282 | |
381 | |
283 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
382 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
284 | |
383 | |
285 | sockinfo si(sa, PROT_UDPv4); |
384 | sockinfo si(sa, PROT_IPv4); |
286 | |
385 | |
287 | if (len > 0) |
386 | if (len > 0) |
288 | { |
387 | { |
289 | pkt->len = len; |
388 | pkt->len = len; |
290 | |
389 | |
|
|
390 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
391 | // this is slow, but... |
|
|
392 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
393 | |
291 | recv_vpn_packet (pkt, si); |
394 | recv_vpn_packet (pkt, si); |
292 | } |
395 | } |
293 | else |
396 | else |
294 | { |
397 | { |
295 | // probably ECONNRESET or somesuch |
398 | // probably ECONNRESET or somesuch |
296 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
399 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
297 | } |
400 | } |
298 | |
401 | |
299 | delete pkt; |
402 | delete pkt; |
300 | } |
403 | } |
301 | else if (revents & POLLHUP) |
404 | else if (revents & POLLHUP) |
302 | { |
405 | { |
303 | // this cannot ;) happen on udp sockets |
406 | // this cannot ;) happen on udp sockets |
304 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
407 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
305 | exit (1); |
408 | exit (1); |
306 | } |
409 | } |
307 | else |
410 | else |
308 | { |
411 | { |
309 | slog (L_ERR, |
412 | slog (L_ERR, |
… | |
… | |
312 | exit (1); |
415 | exit (1); |
313 | } |
416 | } |
314 | } |
417 | } |
315 | |
418 | |
316 | void |
419 | void |
317 | vpn::ipv4_ev (io_watcher &w, short revents) |
420 | vpn::icmpv4_ev (io_watcher &w, short revents) |
318 | { |
421 | { |
319 | if (revents & (POLLIN | POLLERR)) |
422 | if (revents & (POLLIN | POLLERR)) |
320 | { |
423 | { |
321 | vpn_packet *pkt = new vpn_packet; |
424 | vpn_packet *pkt = new vpn_packet; |
322 | struct sockaddr_in sa; |
425 | struct sockaddr_in sa; |
323 | socklen_t sa_len = sizeof (sa); |
426 | socklen_t sa_len = sizeof (sa); |
324 | int len; |
427 | int len; |
325 | |
428 | |
326 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
429 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
327 | |
430 | |
328 | sockinfo si(sa, PROT_IPv4); |
431 | sockinfo si(sa, PROT_ICMPv4); |
329 | |
432 | |
330 | if (len > 0) |
433 | if (len > 0) |
331 | { |
434 | { |
332 | pkt->len = len; |
435 | pkt->len = len; |
333 | |
436 | |
|
|
437 | icmphdr *hdr = (icmphdr *)&((*pkt)[IP_OVERHEAD]); |
|
|
438 | |
|
|
439 | if (hdr->type == ::conf.icmp_type |
|
|
440 | && hdr->code == 255) |
|
|
441 | { |
334 | // raw sockets deliver the ipv4, but don't expect it on sends |
442 | // raw sockets deliver the ipv4, but don't expect it on sends |
335 | // this is slow, but... |
443 | // this is slow, but... |
336 | pkt->skip_hdr (IP_OVERHEAD); |
444 | pkt->skip_hdr (ICMP_OVERHEAD); |
337 | |
445 | |
338 | recv_vpn_packet (pkt, si); |
446 | recv_vpn_packet (pkt, si); |
|
|
447 | } |
339 | } |
448 | } |
340 | else |
449 | else |
341 | { |
450 | { |
342 | // probably ECONNRESET or somesuch |
451 | // probably ECONNRESET or somesuch |
343 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
452 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
… | |
… | |
346 | delete pkt; |
455 | delete pkt; |
347 | } |
456 | } |
348 | else if (revents & POLLHUP) |
457 | else if (revents & POLLHUP) |
349 | { |
458 | { |
350 | // this cannot ;) happen on udp sockets |
459 | // this cannot ;) happen on udp sockets |
351 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
460 | slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); |
|
|
461 | exit (1); |
|
|
462 | } |
|
|
463 | else |
|
|
464 | { |
|
|
465 | slog (L_ERR, |
|
|
466 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
467 | revents); |
|
|
468 | exit (1); |
|
|
469 | } |
|
|
470 | } |
|
|
471 | |
|
|
472 | void |
|
|
473 | vpn::udpv4_ev (io_watcher &w, short revents) |
|
|
474 | { |
|
|
475 | if (revents & (POLLIN | POLLERR)) |
|
|
476 | { |
|
|
477 | vpn_packet *pkt = new vpn_packet; |
|
|
478 | struct sockaddr_in sa; |
|
|
479 | socklen_t sa_len = sizeof (sa); |
|
|
480 | int len; |
|
|
481 | |
|
|
482 | len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
483 | |
|
|
484 | sockinfo si(sa, PROT_UDPv4); |
|
|
485 | |
|
|
486 | if (len > 0) |
|
|
487 | { |
|
|
488 | pkt->len = len; |
|
|
489 | |
|
|
490 | recv_vpn_packet (pkt, si); |
|
|
491 | } |
|
|
492 | else |
|
|
493 | { |
|
|
494 | // probably ECONNRESET or somesuch |
|
|
495 | slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); |
|
|
496 | } |
|
|
497 | |
|
|
498 | delete pkt; |
|
|
499 | } |
|
|
500 | else if (revents & POLLHUP) |
|
|
501 | { |
|
|
502 | // this cannot ;) happen on udp sockets |
|
|
503 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
352 | exit (1); |
504 | exit (1); |
353 | } |
505 | } |
354 | else |
506 | else |
355 | { |
507 | { |
356 | slog (L_ERR, |
508 | slog (L_ERR, |
… | |
… | |
480 | } |
632 | } |
481 | } |
633 | } |
482 | |
634 | |
483 | connection *vpn::find_router () |
635 | connection *vpn::find_router () |
484 | { |
636 | { |
485 | u32 prio = 0; |
637 | u32 prio = 1; |
486 | connection *router = 0; |
638 | connection *router = 0; |
487 | |
639 | |
488 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
640 | for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
489 | { |
641 | { |
490 | connection *c = *i; |
642 | connection *c = *i; |
491 | |
643 | |
492 | if (c->conf->routerprio > prio |
644 | if (c->conf->routerprio >= prio |
493 | && c->connectmode == conf_node::C_ALWAYS |
645 | && c->connectmode == conf_node::C_ALWAYS // so we don't drop the connection if in use |
494 | && c->conf != THISNODE |
|
|
495 | && c->ictx && c->octx) |
646 | && c->ictx && c->octx |
|
|
647 | && c->conf != THISNODE // redundant, since ictx==octx==0 always on thisnode |
|
|
648 | && (!THISNODE->routerprio |
|
|
649 | || c->conf->routerprio <= THISNODE->routerprio)) |
496 | { |
650 | { |
497 | prio = c->conf->routerprio; |
651 | prio = c->conf->routerprio; |
498 | router = c; |
652 | router = c; |
499 | } |
653 | } |
500 | } |
654 | } |
… | |
… | |
537 | |
691 | |
538 | slog (L_NOTICE, _("END status dump")); |
692 | slog (L_NOTICE, _("END status dump")); |
539 | } |
693 | } |
540 | |
694 | |
541 | vpn::vpn (void) |
695 | vpn::vpn (void) |
542 | : event(this, &vpn::event_cb) |
696 | : event (this, &vpn::event_cb) |
543 | , udpv4_ev_watcher(this, &vpn::udpv4_ev) |
697 | , udpv4_ev_watcher (this, &vpn::udpv4_ev) |
544 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
698 | , ipv4_ev_watcher (this, &vpn::ipv4_ev) |
545 | , tap_ev_watcher (this, &vpn::tap_ev) |
|
|
546 | #if ENABLE_TCP |
699 | #if ENABLE_TCP |
547 | , tcpv4_ev_watcher(this, &vpn::tcpv4_ev) |
700 | , tcpv4_ev_watcher (this, &vpn::tcpv4_ev) |
548 | #endif |
701 | #endif |
|
|
702 | #if ENABLE_ICMP |
|
|
703 | , icmpv4_ev_watcher(this, &vpn::icmpv4_ev) |
|
|
704 | #endif |
|
|
705 | , tap_ev_watcher (this, &vpn::tap_ev) |
549 | { |
706 | { |
550 | } |
707 | } |
551 | |
708 | |
552 | vpn::~vpn () |
709 | vpn::~vpn () |
553 | { |
710 | { |