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Commit | Line | Data |
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12471842 PL |
1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
870a0fe4 AT |
22 | #ifdef HAVE_CONFIG_H |
23 | #include "config.h" | |
24 | #endif | |
002c970a | 25 | #include "iputils.hh" |
22cf1fda | 26 | #include <sys/socket.h> |
27 | ||
002c970a | 28 | /** these functions provide a very lightweight wrapper to the Berkeley sockets API. Errors -> exceptions! */ |
29 | ||
30 | static void RuntimeError(const boost::format& fmt) | |
31 | { | |
32 | throw runtime_error(fmt.str()); | |
33 | } | |
34 | ||
35 | ||
36 | int SSocket(int family, int type, int flags) | |
37 | { | |
38 | int ret = socket(family, type, flags); | |
39 | if(ret < 0) | |
40 | RuntimeError(boost::format("creating socket of type %d: %s") % family % strerror(errno)); | |
41 | return ret; | |
42 | } | |
43 | ||
44 | int SConnect(int sockfd, const ComboAddress& remote) | |
45 | { | |
46 | int ret = connect(sockfd, (struct sockaddr*)&remote, remote.getSocklen()); | |
ccb4b5e2 PD |
47 | if(ret < 0) { |
48 | int savederrno = errno; | |
49 | RuntimeError(boost::format("connecting socket to %s: %s") % remote.toStringWithPort() % strerror(savederrno)); | |
50 | } | |
002c970a | 51 | return ret; |
52 | } | |
53 | ||
51959320 RG |
54 | int SConnectWithTimeout(int sockfd, const ComboAddress& remote, int timeout) |
55 | { | |
56 | int ret = connect(sockfd, (struct sockaddr*)&remote, remote.getSocklen()); | |
57 | if(ret < 0) { | |
58 | int savederrno = errno; | |
59 | if (savederrno == EINPROGRESS) { | |
60 | /* we wait until the connection has been established */ | |
61 | bool error = false; | |
62 | bool disconnected = false; | |
63 | int res = waitForRWData(sockfd, false, timeout, 0, &error, &disconnected); | |
64 | if (res == 1) { | |
65 | if (error) { | |
66 | savederrno = 0; | |
67 | socklen_t errlen = sizeof(savederrno); | |
68 | if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, (void *)&savederrno, &errlen) == 0) { | |
69 | RuntimeError(boost::format("connecting to %s failed: %s") % remote.toStringWithPort() % string(strerror(savederrno))); | |
70 | } | |
71 | else { | |
72 | RuntimeError(boost::format("connecting to %s failed") % remote.toStringWithPort()); | |
73 | } | |
74 | } | |
75 | if (disconnected) { | |
76 | RuntimeError(boost::format("%s closed the connection") % remote.toStringWithPort()); | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | else if (res == 0) { | |
81 | RuntimeError(boost::format("timeout while connecting to %s") % remote.toStringWithPort()); | |
82 | } else if (res < 0) { | |
83 | savederrno = errno; | |
84 | RuntimeError(boost::format("waiting to connect to %s: %s") % remote.toStringWithPort() % string(strerror(savederrno))); | |
85 | } | |
86 | } | |
87 | else { | |
88 | RuntimeError(boost::format("connecting to %s: %s") % remote.toStringWithPort() % string(strerror(savederrno))); | |
89 | } | |
90 | } | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
002c970a | 95 | int SBind(int sockfd, const ComboAddress& local) |
96 | { | |
97 | int ret = bind(sockfd, (struct sockaddr*)&local, local.getSocklen()); | |
ccb4b5e2 PD |
98 | if(ret < 0) { |
99 | int savederrno = errno; | |
100 | RuntimeError(boost::format("binding socket to %s: %s") % local.toStringWithPort() % strerror(savederrno)); | |
101 | } | |
002c970a | 102 | return ret; |
103 | } | |
104 | ||
105 | int SAccept(int sockfd, ComboAddress& remote) | |
106 | { | |
107 | socklen_t remlen = remote.getSocklen(); | |
108 | ||
109 | int ret = accept(sockfd, (struct sockaddr*)&remote, &remlen); | |
110 | if(ret < 0) | |
111 | RuntimeError(boost::format("accepting new connection on socket: %s") % strerror(errno)); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | int SListen(int sockfd, int limit) | |
116 | { | |
117 | int ret = listen(sockfd, limit); | |
118 | if(ret < 0) | |
119 | RuntimeError(boost::format("setting socket to listen: %s") % strerror(errno)); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | int SSetsockopt(int sockfd, int level, int opname, int value) | |
124 | { | |
125 | int ret = setsockopt(sockfd, level, opname, &value, sizeof(value)); | |
126 | if(ret < 0) | |
127 | RuntimeError(boost::format("setsockopt for level %d and opname %d to %d failed: %s") % level % opname % value % strerror(errno)); | |
128 | return ret; | |
129 | } | |
130 | ||
131 | ||
3e3f0358 | 132 | bool HarvestTimestamp(struct msghdr* msgh, struct timeval* tv) |
133 | { | |
134 | #ifdef SO_TIMESTAMP | |
135 | struct cmsghdr *cmsg; | |
136 | for (cmsg = CMSG_FIRSTHDR(msgh); cmsg != NULL; cmsg = CMSG_NXTHDR(msgh,cmsg)) { | |
22cf1fda | 137 | if ((cmsg->cmsg_level == SOL_SOCKET) && (cmsg->cmsg_type == SO_TIMESTAMP || cmsg->cmsg_type == SCM_TIMESTAMP) && |
3e3f0358 | 138 | CMSG_LEN(sizeof(*tv)) == cmsg->cmsg_len) { |
139 | memcpy(tv, CMSG_DATA(cmsg), sizeof(*tv)); | |
140 | return true; | |
141 | } | |
142 | } | |
143 | #endif | |
144 | return false; | |
145 | } | |
146 | bool HarvestDestinationAddress(struct msghdr* msgh, ComboAddress* destination) | |
147 | { | |
148 | memset(destination, 0, sizeof(*destination)); | |
149 | struct cmsghdr *cmsg; | |
150 | for (cmsg = CMSG_FIRSTHDR(msgh); cmsg != NULL; cmsg = CMSG_NXTHDR(msgh,cmsg)) { | |
151 | #if defined(IP_PKTINFO) | |
152 | if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_PKTINFO)) { | |
153 | struct in_pktinfo *i = (struct in_pktinfo *) CMSG_DATA(cmsg); | |
154 | destination->sin4.sin_addr = i->ipi_addr; | |
155 | destination->sin4.sin_family = AF_INET; | |
156 | return true; | |
157 | } | |
158 | #elif defined(IP_RECVDSTADDR) | |
159 | if ((cmsg->cmsg_level == IPPROTO_IP) && (cmsg->cmsg_type == IP_RECVDSTADDR)) { | |
160 | struct in_addr *i = (struct in_addr *) CMSG_DATA(cmsg); | |
161 | destination->sin4.sin_addr = *i; | |
162 | destination->sin4.sin_family = AF_INET; | |
163 | return true; | |
164 | } | |
165 | #endif | |
166 | ||
167 | if ((cmsg->cmsg_level == IPPROTO_IPV6) && (cmsg->cmsg_type == IPV6_PKTINFO)) { | |
168 | struct in6_pktinfo *i = (struct in6_pktinfo *) CMSG_DATA(cmsg); | |
169 | destination->sin6.sin6_addr = i->ipi6_addr; | |
170 | destination->sin4.sin_family = AF_INET6; | |
171 | return true; | |
172 | } | |
173 | } | |
174 | return false; | |
175 | } | |
176 | ||
177 | bool IsAnyAddress(const ComboAddress& addr) | |
178 | { | |
179 | if(addr.sin4.sin_family == AF_INET) | |
180 | return addr.sin4.sin_addr.s_addr == 0; | |
181 | else if(addr.sin4.sin_family == AF_INET6) | |
182 | return !memcmp(&addr.sin6.sin6_addr, &in6addr_any, sizeof(addr.sin6.sin6_addr)); | |
183 | ||
184 | return false; | |
185 | } | |
186 | ||
a683e8bd | 187 | ssize_t sendfromto(int sock, const char* data, size_t len, int flags, const ComboAddress& from, const ComboAddress& to) |
3e3f0358 | 188 | { |
189 | struct msghdr msgh; | |
190 | struct iovec iov; | |
191 | char cbuf[256]; | |
192 | ||
193 | /* Set up iov and msgh structures. */ | |
194 | memset(&msgh, 0, sizeof(struct msghdr)); | |
195 | iov.iov_base = (void*)data; | |
196 | iov.iov_len = len; | |
197 | msgh.msg_iov = &iov; | |
198 | msgh.msg_iovlen = 1; | |
199 | msgh.msg_name = (struct sockaddr*)&to; | |
200 | msgh.msg_namelen = to.getSocklen(); | |
201 | ||
202 | if(from.sin4.sin_family) { | |
fbe2a2e0 | 203 | addCMsgSrcAddr(&msgh, cbuf, &from, 0); |
3e3f0358 | 204 | } |
579cae19 PD |
205 | else { |
206 | msgh.msg_control=NULL; | |
207 | } | |
3e3f0358 | 208 | return sendmsg(sock, &msgh, flags); |
209 | } | |
b71b60ee | 210 | |
211 | // be careful: when using this for receive purposes, make sure addr->sin4.sin_family is set appropriately so getSocklen works! | |
212 | // be careful: when using this function for *send* purposes, be sure to set cbufsize to 0! | |
579cae19 | 213 | // be careful: if you don't call addCMsgSrcAddr after fillMSGHdr, make sure to set msg_control to NULL |
b71b60ee | 214 | void fillMSGHdr(struct msghdr* msgh, struct iovec* iov, char* cbuf, size_t cbufsize, char* data, size_t datalen, ComboAddress* addr) |
215 | { | |
216 | iov->iov_base = data; | |
217 | iov->iov_len = datalen; | |
218 | ||
219 | memset(msgh, 0, sizeof(struct msghdr)); | |
220 | ||
221 | msgh->msg_control = cbuf; | |
222 | msgh->msg_controllen = cbufsize; | |
223 | msgh->msg_name = addr; | |
224 | msgh->msg_namelen = addr->getSocklen(); | |
225 | msgh->msg_iov = iov; | |
226 | msgh->msg_iovlen = 1; | |
227 | msgh->msg_flags = 0; | |
228 | } | |
22779196 | 229 | |
5b6099b2 | 230 | // warning: various parts of PowerDNS assume 'truncate' will never throw |
231 | void ComboAddress::truncate(unsigned int bits) noexcept | |
22779196 | 232 | { |
233 | uint8_t* start; | |
234 | int len=4; | |
235 | if(sin4.sin_family==AF_INET) { | |
ecd43f08 | 236 | if(bits >= 32) |
22779196 | 237 | return; |
238 | start = (uint8_t*)&sin4.sin_addr.s_addr; | |
239 | len=4; | |
240 | } | |
241 | else { | |
ecd43f08 | 242 | if(bits >= 128) |
22779196 | 243 | return; |
244 | start = (uint8_t*)&sin6.sin6_addr.s6_addr; | |
245 | len=16; | |
246 | } | |
247 | ||
22779196 | 248 | auto tozero= len*8 - bits; // if set to 22, this will clear 1 byte, as it should |
249 | ||
250 | memset(start + len - tozero/8, 0, tozero/8); // blot out the whole bytes on the right | |
251 | ||
252 | auto bitsleft=tozero % 8; // 2 bits left to clear | |
253 | ||
254 | // a b c d, to truncate to 22 bits, we just zeroed 'd' and need to zero 2 bits from c | |
255 | // so and by '11111100', which is ~((1<<2)-1) = ~3 | |
256 | uint8_t* place = start + len - 1 - tozero/8; | |
22779196 | 257 | *place &= (~((1<<bitsleft)-1)); |
258 | } | |
f9f9592e | 259 | |
fbe2a2e0 RG |
260 | ssize_t sendMsgWithTimeout(int fd, const char* buffer, size_t len, int timeout, ComboAddress& dest, const ComboAddress& local, unsigned int localItf) |
261 | { | |
262 | struct msghdr msgh; | |
263 | struct iovec iov; | |
264 | char cbuf[256]; | |
265 | bool firstTry = true; | |
266 | fillMSGHdr(&msgh, &iov, cbuf, sizeof(cbuf), const_cast<char*>(buffer), len, &dest); | |
267 | addCMsgSrcAddr(&msgh, cbuf, &local, localItf); | |
268 | ||
269 | do { | |
270 | ssize_t written = sendmsg(fd, &msgh, 0); | |
271 | ||
272 | if (written > 0) | |
273 | return written; | |
274 | ||
275 | if (errno == EAGAIN) { | |
276 | if (firstTry) { | |
277 | int res = waitForRWData(fd, false, timeout, 0); | |
278 | if (res > 0) { | |
279 | /* there is room available */ | |
280 | firstTry = false; | |
281 | } | |
282 | else if (res == 0) { | |
283 | throw runtime_error("Timeout while waiting to write data"); | |
284 | } else { | |
285 | throw runtime_error("Error while waiting for room to write data"); | |
286 | } | |
287 | } | |
288 | else { | |
289 | throw runtime_error("Timeout while waiting to write data"); | |
290 | } | |
291 | } | |
292 | else { | |
293 | unixDie("failed in write2WithTimeout"); | |
294 | } | |
295 | } | |
296 | while (firstTry); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
f9f9592e | 301 | template class NetmaskTree<bool>; |
fbe2a2e0 | 302 | |
17bca36a RG |
303 | bool sendSizeAndMsgWithTimeout(int sock, uint16_t bufferLen, const char* buffer, int idleTimeout, const ComboAddress* dest, const ComboAddress* local, unsigned int localItf, int totalTimeout, int flags) |
304 | { | |
305 | uint16_t size = htons(bufferLen); | |
306 | char cbuf[256]; | |
307 | struct msghdr msgh; | |
308 | struct iovec iov[2]; | |
309 | int remainingTime = totalTimeout; | |
310 | time_t start = 0; | |
311 | if (totalTimeout) { | |
312 | start = time(NULL); | |
313 | } | |
314 | ||
315 | /* Set up iov and msgh structures. */ | |
316 | memset(&msgh, 0, sizeof(struct msghdr)); | |
317 | msgh.msg_control = nullptr; | |
318 | msgh.msg_controllen = 0; | |
319 | if (dest) { | |
320 | msgh.msg_name = reinterpret_cast<void*>(const_cast<ComboAddress*>(dest)); | |
321 | msgh.msg_namelen = dest->getSocklen(); | |
322 | } | |
323 | else { | |
324 | msgh.msg_name = nullptr; | |
325 | msgh.msg_namelen = 0; | |
326 | } | |
327 | ||
328 | msgh.msg_flags = 0; | |
329 | ||
330 | if (localItf != 0 && local) { | |
331 | addCMsgSrcAddr(&msgh, cbuf, local, localItf); | |
332 | } | |
333 | ||
334 | iov[0].iov_base = &size; | |
335 | iov[0].iov_len = sizeof(size); | |
336 | iov[1].iov_base = reinterpret_cast<void*>(const_cast<char*>(buffer)); | |
337 | iov[1].iov_len = bufferLen; | |
338 | ||
339 | size_t pos = 0; | |
340 | size_t sent = 0; | |
341 | size_t nbElements = sizeof(iov)/sizeof(*iov); | |
342 | while (true) { | |
343 | msgh.msg_iov = &iov[pos]; | |
344 | msgh.msg_iovlen = nbElements - pos; | |
345 | ||
346 | ssize_t res = sendmsg(sock, &msgh, flags); | |
347 | if (res > 0) { | |
348 | size_t written = static_cast<size_t>(res); | |
349 | sent += written; | |
350 | ||
351 | if (sent == (sizeof(size) + bufferLen)) { | |
352 | return true; | |
353 | } | |
354 | /* partial write, we need to keep only the (parts of) elements | |
355 | that have not been written. | |
356 | */ | |
357 | do { | |
358 | if (written < iov[pos].iov_len) { | |
359 | iov[pos].iov_len -= written; | |
360 | written = 0; | |
361 | } | |
362 | else { | |
363 | written -= iov[pos].iov_len; | |
364 | iov[pos].iov_len = 0; | |
365 | pos++; | |
366 | } | |
367 | } | |
368 | while (written > 0 && pos < nbElements); | |
369 | } | |
370 | else if (res == -1) { | |
371 | if (errno == EINTR) { | |
372 | continue; | |
373 | } | |
374 | else if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINPROGRESS) { | |
375 | /* EINPROGRESS might happen with non blocking socket, | |
376 | especially with TCP Fast Open */ | |
377 | int ret = waitForRWData(sock, false, (totalTimeout == 0 || idleTimeout <= remainingTime) ? idleTimeout : remainingTime, 0); | |
378 | if (ret > 0) { | |
379 | /* there is room available */ | |
380 | } | |
381 | else if (ret == 0) { | |
382 | throw runtime_error("Timeout while waiting to send data"); | |
383 | } else { | |
384 | throw runtime_error("Error while waiting for room to send data"); | |
385 | } | |
386 | } | |
387 | else { | |
388 | unixDie("failed in sendSizeAndMsgWithTimeout"); | |
389 | } | |
390 | } | |
391 | if (totalTimeout) { | |
392 | time_t now = time(NULL); | |
393 | int elapsed = now - start; | |
394 | if (elapsed >= remainingTime) { | |
395 | throw runtime_error("Timeout while sending data"); | |
396 | } | |
397 | start = now; | |
398 | remainingTime -= elapsed; | |
399 | } | |
400 | } | |
401 | ||
402 | return false; | |
403 | } |