pdns/misc.cc

   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  */
  22 #ifdef HAVE_CONFIG_H
  23 #include "config.h"
  24 #endif
  25 #include <sys/param.h>
  26 #include <sys/socket.h>
  27 #include <fcntl.h>
  28 #include <netdb.h>
  29 #include <sys/time.h>
  30 #include <time.h>
  31 #include <sys/resource.h>
  32 #include <netinet/in.h>
  33 #include <sys/un.h>
  34 #include <unistd.h>
  35 #include <fstream>
  36 #include "misc.hh"
  37 #include <vector>
  38 #include <sstream>
  39 #include <errno.h>
  40 #include <cstring>
  41 #include <iostream>
  42 #include <sys/types.h>
  43 #include <dirent.h>
  44 #include <algorithm>
  45 #include <boost/optional.hpp>
  46 #include <poll.h>
  47 #include <iomanip>
  48 #include <netinet/tcp.h>
  49 #include <string.h>
  50 #include <stdlib.h>
  51 #include <stdio.h>
  52 #include "pdnsexception.hh"
  53 #include <sys/types.h>
  54 #include <boost/algorithm/string.hpp>
  55 #include "iputils.hh"
  56 #include "dnsparser.hh"
  57 #include <sys/types.h>
  58 #include <pwd.h>
  59 #include <grp.h>
  60 #ifdef __FreeBSD__
  61 #  include <pthread_np.h>
  62 #endif
  63 #ifdef __NetBSD__
  64 #  include <pthread.h>
  65 #  include <sched.h>
  66 #endif
  67
  68 bool g_singleThreaded;
  69
  70 size_t writen2(int fd, const void *buf, size_t count)
  71 {
  72   const char *ptr = (char*)buf;
  73   const char *eptr = ptr + count;
  74
  75   ssize_t res;
  76   while(ptr != eptr) {
  77     res = ::write(fd, ptr, eptr - ptr);
  78     if(res < 0) {
  79       if (errno == EAGAIN)
  80         throw std::runtime_error("used writen2 on non-blocking socket, got EAGAIN");
  81       else
  82         unixDie("failed in writen2");
  83     }
  84     else if (res == 0)
  85       throw std::runtime_error("could not write all bytes, got eof in writen2");
  86
  87     ptr += (size_t) res;
  88   }
  89
  90   return count;
  91 }
  92
  93 size_t readn2(int fd, void* buffer, size_t len)
  94 {
  95   size_t pos=0;
  96   ssize_t res;
  97   for(;;) {
  98     res = read(fd, (char*)buffer + pos, len - pos);
  99     if(res == 0)
 100       throw runtime_error("EOF while reading message");
 101     if(res < 0) {
 102       if (errno == EAGAIN)
 103         throw std::runtime_error("used readn2 on non-blocking socket, got EAGAIN");
 104       else
 105         unixDie("failed in readn2");
 106     }
 107
 108     pos+=(size_t)res;
 109     if(pos == len)
 110       break;
 111   }
 112   return len;
 113 }
 114
 115 size_t readn2WithTimeout(int fd, void* buffer, size_t len, int idleTimeout, int totalTimeout)
 116 {
 117   size_t pos = 0;
 118   time_t start = 0;
 119   int remainingTime = totalTimeout;
 120   if (totalTimeout) {
 121     start = time(NULL);
 122   }
 123
 124   do {
 125     ssize_t got = read(fd, (char *)buffer + pos, len - pos);
 126     if (got > 0) {
 127       pos += (size_t) got;
 128     }
 129     else if (got == 0) {
 130       throw runtime_error("EOF while reading message");
 131     }
 132     else {
 133       if (errno == EAGAIN) {
 134         int res = waitForData(fd, (totalTimeout == 0 || idleTimeout <= remainingTime) ? idleTimeout : remainingTime);
 135         if (res > 0) {
 136           /* there is data available */
 137         }
 138         else if (res == 0) {
 139           throw runtime_error("Timeout while waiting for data to read");
 140         } else {
 141           throw runtime_error("Error while waiting for data to read");
 142         }
 143       }
 144       else {
 145         unixDie("failed in readn2WithTimeout");
 146       }
 147     }
 148
 149     if (totalTimeout) {
 150       time_t now = time(NULL);
 151       int elapsed = now - start;
 152       if (elapsed >= remainingTime) {
 153         throw runtime_error("Timeout while reading data");
 154       }
 155       start = now;
 156       remainingTime -= elapsed;
 157     }
 158   }
 159   while (pos < len);
 160
 161   return len;
 162 }
 163
 164 size_t writen2WithTimeout(int fd, const void * buffer, size_t len, int timeout)
 165 {
 166   size_t pos = 0;
 167   do {
 168     ssize_t written = write(fd, (char *)buffer + pos, len - pos);
 169
 170     if (written > 0) {
 171       pos += (size_t) written;
 172     }
 173     else if (written == 0)
 174       throw runtime_error("EOF while writing message");
 175     else {
 176       if (errno == EAGAIN) {
 177         int res = waitForRWData(fd, false, timeout, 0);
 178         if (res > 0) {
 179           /* there is room available */
 180         }
 181         else if (res == 0) {
 182           throw runtime_error("Timeout while waiting to write data");
 183         } else {
 184           throw runtime_error("Error while waiting for room to write data");
 185         }
 186       }
 187       else {
 188         unixDie("failed in write2WithTimeout");
 189       }
 190     }
 191   }
 192   while (pos < len);
 193
 194   return len;
 195 }
 196
 197 string nowTime()
 198 {
 199   time_t now = time(nullptr);
 200   struct tm tm;
 201   localtime_r(&now, &tm);
 202   char buffer[30];
 203   // YYYY-mm-dd HH:MM:SS TZOFF
 204   strftime(buffer, sizeof(buffer), "%F %T %z", &tm);
 205   buffer[sizeof(buffer)-1] = '\0';
 206   return string(buffer);
 207 }
 208
 209 uint16_t getShort(const unsigned char *p)
 210 {
 211   return p[0] * 256 + p[1];
 212 }
 213
 214
 215 uint16_t getShort(const char *p)
 216 {
 217   return getShort((const unsigned char *)p);
 218 }
 219
 220 uint32_t getLong(const unsigned char* p)
 221 {
 222   return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3];
 223 }
 224
 225 uint32_t getLong(const char* p)
 226 {
 227   return getLong((unsigned char *)p);
 228 }
 229
 230 static bool ciEqual(const string& a, const string& b)
 231 {
 232   if(a.size()!=b.size())
 233     return false;
 234
 235   string::size_type pos=0, epos=a.size();
 236   for(;pos < epos; ++pos)
 237     if(dns_tolower(a[pos])!=dns_tolower(b[pos]))
 238       return false;
 239   return true;
 240 }
 241
 242 /** does domain end on suffix? Is smart about "wwwds9a.nl" "ds9a.nl" not matching */
 243 static bool endsOn(const string &domain, const string &suffix)
 244 {
 245   if( suffix.empty() || ciEqual(domain, suffix) )
 246     return true;
 247
 248   if(domain.size()<=suffix.size())
 249     return false;
 250
 251   string::size_type dpos=domain.size()-suffix.size()-1, spos=0;
 252
 253   if(domain[dpos++]!='.')
 254     return false;
 255
 256   for(; dpos < domain.size(); ++dpos, ++spos)
 257     if(dns_tolower(domain[dpos]) != dns_tolower(suffix[spos]))
 258       return false;
 259
 260   return true;
 261 }
 262
 263 /** strips a domain suffix from a domain, returns true if it stripped */
 264 bool stripDomainSuffix(string *qname, const string &domain)
 265 {
 266   if(!endsOn(*qname, domain))
 267     return false;
 268
 269   if(toLower(*qname)==toLower(domain))
 270     *qname="@";
 271   else {
 272     if((*qname)[qname->size()-domain.size()-1]!='.')
 273       return false;
 274
 275     qname->resize(qname->size()-domain.size()-1);
 276   }
 277   return true;
 278 }
 279
 280 static void parseService4(const string &descr, ServiceTuple &st)
 281 {
 282   vector<string>parts;
 283   stringtok(parts,descr,":");
 284   if(parts.empty())
 285     throw PDNSException("Unable to parse '"+descr+"' as a service");
 286   st.host=parts[0];
 287   if(parts.size()>1)
 288     st.port=pdns_stou(parts[1]);
 289 }
 290
 291 static void parseService6(const string &descr, ServiceTuple &st)
 292 {
 293   string::size_type pos=descr.find(']');
 294   if(pos == string::npos)
 295     throw PDNSException("Unable to parse '"+descr+"' as an IPv6 service");
 296
 297   st.host=descr.substr(1, pos-1);
 298   if(pos + 2 < descr.length())
 299     st.port=pdns_stou(descr.substr(pos+2));
 300 }
 301
 302
 303 void parseService(const string &descr, ServiceTuple &st)
 304 {
 305   if(descr.empty())
 306     throw PDNSException("Unable to parse '"+descr+"' as a service");
 307
 308   vector<string> parts;
 309   stringtok(parts, descr, ":");
 310
 311   if(descr[0]=='[') {
 312     parseService6(descr, st);
 313   }
 314   else if(descr[0]==':' || parts.size() > 2 || descr.find("::") != string::npos) {
 315     st.host=descr;
 316   }
 317   else {
 318     parseService4(descr, st);
 319   }
 320 }
 321
 322 // returns -1 in case if error, 0 if no data is available, 1 if there is. In the first two cases, errno is set
 323 int waitForData(int fd, int seconds, int useconds)
 324 {
 325   return waitForRWData(fd, true, seconds, useconds);
 326 }
 327
 328 int waitForRWData(int fd, bool waitForRead, int seconds, int useconds, bool* error, bool* disconnected)
 329 {
 330   int ret;
 331
 332   struct pollfd pfd;
 333   memset(&pfd, 0, sizeof(pfd));
 334   pfd.fd = fd;
 335
 336   if(waitForRead)
 337     pfd.events=POLLIN;
 338   else
 339     pfd.events=POLLOUT;
 340
 341   ret = poll(&pfd, 1, seconds * 1000 + useconds/1000);
 342   if (ret > 0) {
 343     if (error && (pfd.revents & POLLERR)) {
 344       *error = true;
 345     }
 346     if (disconnected && (pfd.revents & POLLHUP)) {
 347       *disconnected = true;
 348     }
 349   }
 350
 351   return ret;
 352 }
 353
 354 // returns -1 in case of error, 0 if no data is available, 1 if there is. In the first two cases, errno is set
 355 int waitForMultiData(const set<int>& fds, const int seconds, const int useconds, int* fdOut) {
 356   set<int> realFDs;
 357   for (const auto& fd : fds) {
 358     if (fd >= 0 && realFDs.count(fd) == 0) {
 359       realFDs.insert(fd);
 360     }
 361   }
 362
 363   std::vector<struct pollfd> pfds(realFDs.size());
 364   memset(pfds.data(), 0, realFDs.size()*sizeof(struct pollfd));
 365   int ctr = 0;
 366   for (const auto& fd : realFDs) {
 367     pfds[ctr].fd = fd;
 368     pfds[ctr].events = POLLIN;
 369     ctr++;
 370   }
 371
 372   int ret;
 373   if(seconds >= 0)
 374     ret = poll(pfds.data(), realFDs.size(), seconds * 1000 + useconds/1000);
 375   else
 376     ret = poll(pfds.data(), realFDs.size(), -1);
 377   if(ret <= 0)
 378     return ret;
 379
 380   set<int> pollinFDs;
 381   for (const auto& pfd : pfds) {
 382     if (pfd.revents & POLLIN) {
 383       pollinFDs.insert(pfd.fd);
 384     }
 385   }
 386   set<int>::const_iterator it(pollinFDs.begin());
 387   advance(it, random() % pollinFDs.size());
 388   *fdOut = *it;
 389   return 1;
 390 }
 391
 392 // returns -1 in case of error, 0 if no data is available, 1 if there is. In the first two cases, errno is set
 393 int waitFor2Data(int fd1, int fd2, int seconds, int useconds, int*fd)
 394 {
 395   int ret;
 396
 397   struct pollfd pfds[2];
 398   memset(&pfds[0], 0, 2*sizeof(struct pollfd));
 399   pfds[0].fd = fd1;
 400   pfds[1].fd = fd2;
 401
 402   pfds[0].events= pfds[1].events = POLLIN;
 403
 404   int nsocks = 1 + (fd2 >= 0); // fd2 can optionally be -1
 405
 406   if(seconds >= 0)
 407     ret = poll(pfds, nsocks, seconds * 1000 + useconds/1000);
 408   else
 409     ret = poll(pfds, nsocks, -1);
 410   if(!ret || ret < 0)
 411     return ret;
 412
 413   if((pfds[0].revents & POLLIN) && !(pfds[1].revents & POLLIN))
 414     *fd = pfds[0].fd;
 415   else if((pfds[1].revents & POLLIN) && !(pfds[0].revents & POLLIN))
 416     *fd = pfds[1].fd;
 417   else if(ret == 2) {
 418     *fd = pfds[random()%2].fd;
 419   }
 420   else
 421     *fd = -1; // should never happen
 422
 423   return 1;
 424 }
 425
 426
 427 string humanDuration(time_t passed)
 428 {
 429   ostringstream ret;
 430   if(passed<60)
 431     ret<<passed<<" seconds";
 432   else if(passed<3600)
 433     ret<<std::setprecision(2)<<passed/60.0<<" minutes";
 434   else if(passed<86400)
 435     ret<<std::setprecision(3)<<passed/3600.0<<" hours";
 436   else if(passed<(86400*30.41))
 437     ret<<std::setprecision(3)<<passed/86400.0<<" days";
 438   else
 439     ret<<std::setprecision(3)<<passed/(86400*30.41)<<" months";
 440
 441   return ret.str();
 442 }
 443
 444 DTime::DTime()
 445 {
 446 //  set(); // saves lots of gettimeofday calls
 447   d_set.tv_sec=d_set.tv_usec=0;
 448 }
 449
 450 time_t DTime::time()
 451 {
 452   return d_set.tv_sec;
 453 }
 454
 455 const string unquotify(const string &item)
 456 {
 457   if(item.size()<2)
 458     return item;
 459
 460   string::size_type bpos=0, epos=item.size();
 461
 462   if(item[0]=='"')
 463     bpos=1;
 464
 465   if(item[epos-1]=='"')
 466     epos-=1;
 467
 468   return item.substr(bpos,epos-bpos);
 469 }
 470
 471 void stripLine(string &line)
 472 {
 473   string::size_type pos=line.find_first_of("\r\n");
 474   if(pos!=string::npos) {
 475     line.resize(pos);
 476   }
 477 }
 478
 479 string urlEncode(const string &text)
 480 {
 481   string ret;
 482   for(string::const_iterator i=text.begin();i!=text.end();++i)
 483     if(*i==' ')ret.append("%20");
 484     else ret.append(1,*i);
 485   return ret;
 486 }
 487
 488 string getHostname()
 489 {
 490 #ifndef MAXHOSTNAMELEN
 491 #define MAXHOSTNAMELEN 255
 492 #endif
 493
 494   char tmp[MAXHOSTNAMELEN];
 495   if(gethostname(tmp, MAXHOSTNAMELEN))
 496     return "UNKNOWN";
 497
 498   return string(tmp);
 499 }
 500
 501 string itoa(int i)
 502 {
 503   ostringstream o;
 504   o<<i;
 505   return o.str();
 506 }
 507
 508 string uitoa(unsigned int i) // MSVC 6 doesn't grok overloading (un)signed
 509 {
 510   ostringstream o;
 511   o<<i;
 512   return o.str();
 513 }
 514
 515 string bitFlip(const string &str)
 516 {
 517   string::size_type pos=0, epos=str.size();
 518   string ret;
 519   ret.reserve(epos);
 520   for(;pos < epos; ++pos)
 521     ret.append(1, ~str[pos]);
 522   return ret;
 523 }
 524
 525 string stringerror(int err)
 526 {
 527   return strerror(err);
 528 }
 529
 530 string stringerror()
 531 {
 532   return strerror(errno);
 533 }
 534
 535 void cleanSlashes(string &str)
 536 {
 537   string::const_iterator i;
 538   string out;
 539   for(i=str.begin();i!=str.end();++i) {
 540     if(*i=='/' && i!=str.begin() && *(i-1)=='/')
 541       continue;
 542     out.append(1,*i);
 543   }
 544   str=out;
 545 }
 546
 547
 548 bool IpToU32(const string &str, uint32_t *ip)
 549 {
 550   if(str.empty()) {
 551     *ip=0;
 552     return true;
 553   }
 554
 555   struct in_addr inp;
 556   if(inet_aton(str.c_str(), &inp)) {
 557     *ip=inp.s_addr;
 558     return true;
 559   }
 560   return false;
 561 }
 562
 563 string U32ToIP(uint32_t val)
 564 {
 565   char tmp[17];
 566   snprintf(tmp, sizeof(tmp), "%u.%u.%u.%u",
 567            (val >> 24)&0xff,
 568            (val >> 16)&0xff,
 569            (val >>  8)&0xff,
 570            (val      )&0xff);
 571   return string(tmp);
 572 }
 573
 574
 575 string makeHexDump(const string& str)
 576 {
 577   char tmp[5];
 578   string ret;
 579   ret.reserve((int)(str.size()*2.2));
 580
 581   for(string::size_type n=0;n<str.size();++n) {
 582     snprintf(tmp, sizeof(tmp), "%02x ", (unsigned char)str[n]);
 583     ret+=tmp;
 584   }
 585   return ret;
 586 }
 587
 588 // shuffle, maintaining some semblance of order
 589 void shuffle(vector<DNSZoneRecord>& rrs)
 590 {
 591   vector<DNSZoneRecord>::iterator first, second;
 592   for(first=rrs.begin();first!=rrs.end();++first)
 593     if(first->dr.d_place==DNSResourceRecord::ANSWER && first->dr.d_type != QType::CNAME) // CNAME must come first
 594       break;
 595   for(second=first;second!=rrs.end();++second)
 596     if(second->dr.d_place!=DNSResourceRecord::ANSWER)
 597       break;
 598
 599   if(second-first > 1)
 600     random_shuffle(first,second);
 601
 602   // now shuffle the additional records
 603   for(first=second;first!=rrs.end();++first)
 604     if(first->dr.d_place==DNSResourceRecord::ADDITIONAL && first->dr.d_type != QType::CNAME) // CNAME must come first
 605       break;
 606   for(second=first;second!=rrs.end();++second)
 607     if(second->dr.d_place!=DNSResourceRecord::ADDITIONAL)
 608       break;
 609
 610   if(second-first>1)
 611     random_shuffle(first,second);
 612
 613   // we don't shuffle the rest
 614 }
 615
 616
 617 // shuffle, maintaining some semblance of order
 618 void shuffle(vector<DNSRecord>& rrs)
 619 {
 620   vector<DNSRecord>::iterator first, second;
 621   for(first=rrs.begin();first!=rrs.end();++first)
 622     if(first->d_place==DNSResourceRecord::ANSWER && first->d_type != QType::CNAME) // CNAME must come first
 623       break;
 624   for(second=first;second!=rrs.end();++second)
 625     if(second->d_place!=DNSResourceRecord::ANSWER || second->d_type == QType::RRSIG) // leave RRSIGs at the end
 626       break;
 627
 628   if(second-first>1)
 629     random_shuffle(first,second);
 630
 631   // now shuffle the additional records
 632   for(first=second;first!=rrs.end();++first)
 633     if(first->d_place==DNSResourceRecord::ADDITIONAL && first->d_type != QType::CNAME) // CNAME must come first
 634       break;
 635   for(second=first; second!=rrs.end(); ++second)
 636     if(second->d_place!=DNSResourceRecord::ADDITIONAL)
 637       break;
 638
 639   if(second-first>1)
 640     random_shuffle(first,second);
 641
 642   // we don't shuffle the rest
 643 }
 644
 645 static uint16_t mapTypesToOrder(uint16_t type)
 646 {
 647   if(type == QType::CNAME)
 648     return 0;
 649   if(type == QType::RRSIG)
 650     return 65535;
 651   else
 652     return 1;
 653 }
 654
 655 // make sure rrs is sorted in d_place order to avoid surprises later
 656 // then shuffle the parts that desire shuffling
 657 void orderAndShuffle(vector<DNSRecord>& rrs)
 658 {
 659   std::stable_sort(rrs.begin(), rrs.end(), [](const DNSRecord&a, const DNSRecord& b) {
 660       return std::make_tuple(a.d_place, mapTypesToOrder(a.d_type)) < std::make_tuple(b.d_place, mapTypesToOrder(b.d_type));
 661     });
 662   shuffle(rrs);
 663 }
 664
 665 void normalizeTV(struct timeval& tv)
 666 {
 667   if(tv.tv_usec > 1000000) {
 668     ++tv.tv_sec;
 669     tv.tv_usec-=1000000;
 670   }
 671   else if(tv.tv_usec < 0) {
 672     --tv.tv_sec;
 673     tv.tv_usec+=1000000;
 674   }
 675 }
 676
 677 const struct timeval operator+(const struct timeval& lhs, const struct timeval& rhs)
 678 {
 679   struct timeval ret;
 680   ret.tv_sec=lhs.tv_sec + rhs.tv_sec;
 681   ret.tv_usec=lhs.tv_usec + rhs.tv_usec;
 682   normalizeTV(ret);
 683   return ret;
 684 }
 685
 686 const struct timeval operator-(const struct timeval& lhs, const struct timeval& rhs)
 687 {
 688   struct timeval ret;
 689   ret.tv_sec=lhs.tv_sec - rhs.tv_sec;
 690   ret.tv_usec=lhs.tv_usec - rhs.tv_usec;
 691   normalizeTV(ret);
 692   return ret;
 693 }
 694
 695 pair<string, string> splitField(const string& inp, char sepa)
 696 {
 697   pair<string, string> ret;
 698   string::size_type cpos=inp.find(sepa);
 699   if(cpos==string::npos)
 700     ret.first=inp;
 701   else {
 702     ret.first=inp.substr(0, cpos);
 703     ret.second=inp.substr(cpos+1);
 704   }
 705   return ret;
 706 }
 707
 708 int logFacilityToLOG(unsigned int facility)
 709 {
 710   switch(facility) {
 711   case 0:
 712     return LOG_LOCAL0;
 713   case 1:
 714     return(LOG_LOCAL1);
 715   case 2:
 716     return(LOG_LOCAL2);
 717   case 3:
 718     return(LOG_LOCAL3);
 719   case 4:
 720     return(LOG_LOCAL4);
 721   case 5:
 722     return(LOG_LOCAL5);
 723   case 6:
 724     return(LOG_LOCAL6);
 725   case 7:
 726     return(LOG_LOCAL7);
 727   default:
 728     return -1;
 729   }
 730 }
 731
 732 string stripDot(const string& dom)
 733 {
 734   if(dom.empty())
 735     return dom;
 736
 737   if(dom[dom.size()-1]!='.')
 738     return dom;
 739
 740   return dom.substr(0,dom.size()-1);
 741 }
 742
 743
 744
 745 int makeIPv6sockaddr(const std::string& addr, struct sockaddr_in6* ret)
 746 {
 747   if(addr.empty())
 748     return -1;
 749   string ourAddr(addr);
 750   bool portSet = false;
 751   unsigned int port;
 752   if(addr[0]=='[') { // [::]:53 style address
 753     string::size_type pos = addr.find(']');
 754     if(pos == string::npos)
 755       return -1;
 756     ourAddr.assign(addr.c_str() + 1, pos-1);
 757     if (pos + 1 != addr.size()) { // complete after ], no port specified
 758       if (pos + 2 > addr.size() || addr[pos+1]!=':')
 759         return -1;
 760       try {
 761         port = pdns_stou(addr.substr(pos+2));
 762         portSet = true;
 763       }
 764       catch(const std::out_of_range&) {
 765         return -1;
 766       }
 767     }
 768   }
 769   ret->sin6_scope_id=0;
 770   ret->sin6_family=AF_INET6;
 771
 772   if(inet_pton(AF_INET6, ourAddr.c_str(), (void*)&ret->sin6_addr) != 1) {
 773     struct addrinfo* res;
 774     struct addrinfo hints;
 775     memset(&hints, 0, sizeof(hints));
 776
 777     hints.ai_family = AF_INET6;
 778     hints.ai_flags = AI_NUMERICHOST;
 779
 780     int error;
 781     // getaddrinfo has anomalous return codes, anything nonzero is an error, positive or negative
 782     if((error=getaddrinfo(ourAddr.c_str(), 0, &hints, &res))) {
 783       return -1;
 784     }
 785
 786     memcpy(ret, res->ai_addr, res->ai_addrlen);
 787     freeaddrinfo(res);
 788   }
 789
 790   if(portSet) {
 791     if(port > 65535)
 792       return -1;
 793
 794     ret->sin6_port = htons(port);
 795   }
 796
 797   return 0;
 798 }
 799
 800 int makeIPv4sockaddr(const std::string& str, struct sockaddr_in* ret)
 801 {
 802   if(str.empty()) {
 803     return -1;
 804   }
 805   struct in_addr inp;
 806
 807   string::size_type pos = str.find(':');
 808   if(pos == string::npos) { // no port specified, not touching the port
 809     if(inet_aton(str.c_str(), &inp)) {
 810       ret->sin_addr.s_addr=inp.s_addr;
 811       return 0;
 812     }
 813     return -1;
 814   }
 815   if(!*(str.c_str() + pos + 1)) // trailing :
 816     return -1;
 817
 818   char *eptr = (char*)str.c_str() + str.size();
 819   int port = strtol(str.c_str() + pos + 1, &eptr, 10);
 820   if (port < 0 || port > 65535)
 821     return -1;
 822
 823   if(*eptr)
 824     return -1;
 825
 826   ret->sin_port = htons(port);
 827   if(inet_aton(str.substr(0, pos).c_str(), &inp)) {
 828     ret->sin_addr.s_addr=inp.s_addr;
 829     return 0;
 830   }
 831   return -1;
 832 }
 833
 834 int makeUNsockaddr(const std::string& path, struct sockaddr_un* ret)
 835 {
 836   if (path.empty())
 837     return -1;
 838
 839   memset(ret, 0, sizeof(struct sockaddr_un));
 840   ret->sun_family = AF_UNIX;
 841   if (path.length() >= sizeof(ret->sun_path))
 842     return -1;
 843
 844   path.copy(ret->sun_path, sizeof(ret->sun_path), 0);
 845   return 0;
 846 }
 847
 848 //! read a line of text from a FILE* to a std::string, returns false on 'no data'
 849 bool stringfgets(FILE* fp, std::string& line)
 850 {
 851   char buffer[1024];
 852   line.clear();
 853
 854   do {
 855     if(!fgets(buffer, sizeof(buffer), fp))
 856       return !line.empty();
 857
 858     line.append(buffer);
 859   } while(!strchr(buffer, '\n'));
 860   return true;
 861 }
 862
 863 bool readFileIfThere(const char* fname, std::string* line)
 864 {
 865   line->clear();
 866   auto fp = std::unique_ptr<FILE, int(*)(FILE*)>(fopen(fname, "r"), fclose);
 867   if(!fp)
 868     return false;
 869   stringfgets(fp.get(), *line);
 870   fp.reset();
 871
 872   return true;
 873 }
 874
 875 Regex::Regex(const string &expr)
 876 {
 877   if(regcomp(&d_preg, expr.c_str(), REG_ICASE|REG_NOSUB|REG_EXTENDED))
 878     throw PDNSException("Regular expression did not compile");
 879 }
 880
 881 // if you end up here because valgrind told you were are doing something wrong
 882 // with msgh->msg_controllen, please refer to https://github.com/PowerDNS/pdns/pull/3962
 883 // first.
 884 // Note that cmsgbuf should be aligned the same as a struct cmsghdr
 885 void addCMsgSrcAddr(struct msghdr* msgh, cmsgbuf_aligned* cmsgbuf, const ComboAddress* source, int itfIndex)
 886 {
 887   struct cmsghdr *cmsg = NULL;
 888
 889   if(source->sin4.sin_family == AF_INET6) {
 890     struct in6_pktinfo *pkt;
 891
 892     msgh->msg_control = cmsgbuf;
 893     static_assert(CMSG_SPACE(sizeof(*pkt)) <= sizeof(*cmsgbuf), "Buffer is too small for in6_pktinfo");
 894     msgh->msg_controllen = CMSG_SPACE(sizeof(*pkt));
 895
 896     cmsg = CMSG_FIRSTHDR(msgh);
 897     cmsg->cmsg_level = IPPROTO_IPV6;
 898     cmsg->cmsg_type = IPV6_PKTINFO;
 899     cmsg->cmsg_len = CMSG_LEN(sizeof(*pkt));
 900
 901     pkt = (struct in6_pktinfo *) CMSG_DATA(cmsg);
 902     // Include the padding to stop valgrind complaining about passing uninitialized data
 903     memset(pkt, 0, CMSG_SPACE(sizeof(*pkt)));
 904     pkt->ipi6_addr = source->sin6.sin6_addr;
 905     pkt->ipi6_ifindex = itfIndex;
 906   }
 907   else {
 908 #if defined(IP_PKTINFO)
 909     struct in_pktinfo *pkt;
 910
 911     msgh->msg_control = cmsgbuf;
 912     static_assert(CMSG_SPACE(sizeof(*pkt)) <= sizeof(*cmsgbuf), "Buffer is too small for in_pktinfo");
 913     msgh->msg_controllen = CMSG_SPACE(sizeof(*pkt));
 914
 915     cmsg = CMSG_FIRSTHDR(msgh);
 916     cmsg->cmsg_level = IPPROTO_IP;
 917     cmsg->cmsg_type = IP_PKTINFO;
 918     cmsg->cmsg_len = CMSG_LEN(sizeof(*pkt));
 919
 920     pkt = (struct in_pktinfo *) CMSG_DATA(cmsg);
 921     // Include the padding to stop valgrind complaining about passing uninitialized data
 922     memset(pkt, 0, CMSG_SPACE(sizeof(*pkt)));
 923     pkt->ipi_spec_dst = source->sin4.sin_addr;
 924     pkt->ipi_ifindex = itfIndex;
 925 #elif defined(IP_SENDSRCADDR)
 926     struct in_addr *in;
 927
 928     msgh->msg_control = cmsgbuf;
 929     static_assert(CMSG_SPACE(sizeof(*in)) <= sizeof(*cmsgbuf), "Buffer is too small for in_addr");
 930     msgh->msg_controllen = CMSG_SPACE(sizeof(*in));
 931
 932     cmsg = CMSG_FIRSTHDR(msgh);
 933     cmsg->cmsg_level = IPPROTO_IP;
 934     cmsg->cmsg_type = IP_SENDSRCADDR;
 935     cmsg->cmsg_len = CMSG_LEN(sizeof(*in));
 936
 937     // Include the padding to stop valgrind complaining about passing uninitialized data
 938     in = (struct in_addr *) CMSG_DATA(cmsg);
 939     memset(in, 0, CMSG_SPACE(sizeof(*in)));
 940     *in = source->sin4.sin_addr;
 941 #endif
 942   }
 943 }
 944
 945 unsigned int getFilenumLimit(bool hardOrSoft)
 946 {
 947   struct rlimit rlim;
 948   if(getrlimit(RLIMIT_NOFILE, &rlim) < 0)
 949     unixDie("Requesting number of available file descriptors");
 950   return hardOrSoft ? rlim.rlim_max : rlim.rlim_cur;
 951 }
 952
 953 void setFilenumLimit(unsigned int lim)
 954 {
 955   struct rlimit rlim;
 956
 957   if(getrlimit(RLIMIT_NOFILE, &rlim) < 0)
 958     unixDie("Requesting number of available file descriptors");
 959   rlim.rlim_cur=lim;
 960   if(setrlimit(RLIMIT_NOFILE, &rlim) < 0)
 961     unixDie("Setting number of available file descriptors");
 962 }
 963
 964 #define burtlemix(a,b,c) \
 965 { \
 966   a -= b; a -= c; a ^= (c>>13); \
 967   b -= c; b -= a; b ^= (a<<8); \
 968   c -= a; c -= b; c ^= (b>>13); \
 969   a -= b; a -= c; a ^= (c>>12);  \
 970   b -= c; b -= a; b ^= (a<<16); \
 971   c -= a; c -= b; c ^= (b>>5); \
 972   a -= b; a -= c; a ^= (c>>3);  \
 973   b -= c; b -= a; b ^= (a<<10); \
 974   c -= a; c -= b; c ^= (b>>15); \
 975 }
 976
 977 uint32_t burtle(const unsigned char* k, uint32_t length, uint32_t initval)
 978 {
 979   uint32_t a,b,c,len;
 980
 981    /* Set up the internal state */
 982   len = length;
 983   a = b = 0x9e3779b9;  /* the golden ratio; an arbitrary value */
 984   c = initval;         /* the previous hash value */
 985
 986   /*---------------------------------------- handle most of the key */
 987   while (len >= 12) {
 988     a += (k[0] +((uint32_t)k[1]<<8) +((uint32_t)k[2]<<16) +((uint32_t)k[3]<<24));
 989     b += (k[4] +((uint32_t)k[5]<<8) +((uint32_t)k[6]<<16) +((uint32_t)k[7]<<24));
 990     c += (k[8] +((uint32_t)k[9]<<8) +((uint32_t)k[10]<<16)+((uint32_t)k[11]<<24));
 991     burtlemix(a,b,c);
 992     k += 12; len -= 12;
 993   }
 994
 995   /*------------------------------------- handle the last 11 bytes */
 996   c += length;
 997   switch(len) {             /* all the case statements fall through */
 998   case 11: c+=((uint32_t)k[10]<<24);
 999   case 10: c+=((uint32_t)k[9]<<16);
1000   case 9 : c+=((uint32_t)k[8]<<8);
1001     /* the first byte of c is reserved for the length */
1002   case 8 : b+=((uint32_t)k[7]<<24);
1003   case 7 : b+=((uint32_t)k[6]<<16);
1004   case 6 : b+=((uint32_t)k[5]<<8);
1005   case 5 : b+=k[4];
1006   case 4 : a+=((uint32_t)k[3]<<24);
1007   case 3 : a+=((uint32_t)k[2]<<16);
1008   case 2 : a+=((uint32_t)k[1]<<8);
1009   case 1 : a+=k[0];
1010     /* case 0: nothing left to add */
1011   }
1012   burtlemix(a,b,c);
1013   /*-------------------------------------------- report the result */
1014   return c;
1015 }
1016
1017 uint32_t burtleCI(const unsigned char* k, uint32_t length, uint32_t initval)
1018 {
1019   uint32_t a,b,c,len;
1020
1021    /* Set up the internal state */
1022   len = length;
1023   a = b = 0x9e3779b9;  /* the golden ratio; an arbitrary value */
1024   c = initval;         /* the previous hash value */
1025
1026   /*---------------------------------------- handle most of the key */
1027   while (len >= 12) {
1028     a += (dns_tolower(k[0]) +((uint32_t)dns_tolower(k[1])<<8) +((uint32_t)dns_tolower(k[2])<<16) +((uint32_t)dns_tolower(k[3])<<24));
1029     b += (dns_tolower(k[4]) +((uint32_t)dns_tolower(k[5])<<8) +((uint32_t)dns_tolower(k[6])<<16) +((uint32_t)dns_tolower(k[7])<<24));
1030     c += (dns_tolower(k[8]) +((uint32_t)dns_tolower(k[9])<<8) +((uint32_t)dns_tolower(k[10])<<16)+((uint32_t)dns_tolower(k[11])<<24));
1031     burtlemix(a,b,c);
1032     k += 12; len -= 12;
1033   }
1034
1035   /*------------------------------------- handle the last 11 bytes */
1036   c += length;
1037   switch(len) {             /* all the case statements fall through */
1038   case 11: c+=((uint32_t)dns_tolower(k[10])<<24);
1039   case 10: c+=((uint32_t)dns_tolower(k[9])<<16);
1040   case 9 : c+=((uint32_t)dns_tolower(k[8])<<8);
1041     /* the first byte of c is reserved for the length */
1042   case 8 : b+=((uint32_t)dns_tolower(k[7])<<24);
1043   case 7 : b+=((uint32_t)dns_tolower(k[6])<<16);
1044   case 6 : b+=((uint32_t)dns_tolower(k[5])<<8);
1045   case 5 : b+=dns_tolower(k[4]);
1046   case 4 : a+=((uint32_t)dns_tolower(k[3])<<24);
1047   case 3 : a+=((uint32_t)dns_tolower(k[2])<<16);
1048   case 2 : a+=((uint32_t)dns_tolower(k[1])<<8);
1049   case 1 : a+=dns_tolower(k[0]);
1050     /* case 0: nothing left to add */
1051   }
1052   burtlemix(a,b,c);
1053   /*-------------------------------------------- report the result */
1054   return c;
1055 }
1056
1057
1058 bool setSocketTimestamps(int fd)
1059 {
1060 #ifdef SO_TIMESTAMP
1061   int on=1;
1062   return setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, (char*)&on, sizeof(on)) == 0;
1063 #else
1064   return true; // we pretend this happened.
1065 #endif
1066 }
1067
1068 bool setTCPNoDelay(int sock)
1069 {
1070   int flag = 1;
1071   return setsockopt(sock,            /* socket affected */
1072                     IPPROTO_TCP,     /* set option at TCP level */
1073                     TCP_NODELAY,     /* name of option */
1074                     (char *) &flag,  /* the cast is historical cruft */
1075                     sizeof(flag)) == 0;    /* length of option value */
1076 }
1077
1078
1079 bool setNonBlocking(int sock)
1080 {
1081   int flags=fcntl(sock,F_GETFL,0);
1082   if(flags<0 || fcntl(sock, F_SETFL,flags|O_NONBLOCK) <0)
1083     return false;
1084   return true;
1085 }
1086
1087 bool setBlocking(int sock)
1088 {
1089   int flags=fcntl(sock,F_GETFL,0);
1090   if(flags<0 || fcntl(sock, F_SETFL,flags&(~O_NONBLOCK)) <0)
1091     return false;
1092   return true;
1093 }
1094
1095 bool setReuseAddr(int sock)
1096 {
1097   int tmp = 1;
1098   if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&tmp, static_cast<unsigned>(sizeof tmp))<0)
1099     throw PDNSException(string("Setsockopt failed: ")+stringerror());
1100   return true;
1101 }
1102
1103 bool isNonBlocking(int sock)
1104 {
1105   int flags=fcntl(sock,F_GETFL,0);
1106   return flags & O_NONBLOCK;
1107 }
1108
1109 bool setReceiveSocketErrors(int sock, int af)
1110 {
1111 #ifdef __linux__
1112   int tmp = 1, ret;
1113   if (af == AF_INET) {
1114     ret = setsockopt(sock, IPPROTO_IP, IP_RECVERR, &tmp, sizeof(tmp));
1115   } else {
1116     ret = setsockopt(sock, IPPROTO_IPV6, IPV6_RECVERR, &tmp, sizeof(tmp));
1117   }
1118   if (ret < 0) {
1119     throw PDNSException(string("Setsockopt failed: ") + stringerror());
1120   }
1121 #endif
1122   return true;
1123 }
1124
1125 // Closes a socket.
1126 int closesocket( int socket )
1127 {
1128   int ret=::close(socket);
1129   if(ret < 0 && errno == ECONNRESET) // see ticket 192, odd BSD behaviour
1130     return 0;
1131   if(ret < 0)
1132     throw PDNSException("Error closing socket: "+stringerror());
1133   return ret;
1134 }
1135
1136 bool setCloseOnExec(int sock)
1137 {
1138   int flags=fcntl(sock,F_GETFD,0);
1139   if(flags<0 || fcntl(sock, F_SETFD,flags|FD_CLOEXEC) <0)
1140     return false;
1141   return true;
1142 }
1143
1144 string getMACAddress(const ComboAddress& ca)
1145 {
1146   string ret;
1147 #ifdef __linux__
1148   ifstream ifs("/proc/net/arp");
1149   if(!ifs)
1150     return ret;
1151   string line;
1152   string match=ca.toString()+' ';
1153   while(getline(ifs, line)) {
1154     if(boost::starts_with(line, match)) {
1155       vector<string> parts;
1156       stringtok(parts, line, " \n\t\r");
1157       if(parts.size() < 4)
1158         return ret;
1159       unsigned int tmp[6];
1160       sscanf(parts[3].c_str(), "%02x:%02x:%02x:%02x:%02x:%02x", tmp, tmp+1, tmp+2, tmp+3, tmp+4, tmp+5);
1161       for(int i = 0 ; i< 6 ; ++i)
1162         ret.append(1, (char)tmp[i]);
1163       return ret;
1164     }
1165   }
1166 #endif
1167   return ret;
1168 }
1169
1170 uint64_t udpErrorStats(const std::string& str)
1171 {
1172 #ifdef __linux__
1173   ifstream ifs("/proc/net/snmp");
1174   if(!ifs)
1175     return 0;
1176   string line;
1177   vector<string> parts;
1178   while(getline(ifs,line)) {
1179     if(boost::starts_with(line, "Udp: ") && isdigit(line[5])) {
1180       stringtok(parts, line, " \n\t\r");
1181       if(parts.size() < 7)
1182         break;
1183       if(str=="udp-rcvbuf-errors")
1184         return std::stoull(parts[5]);
1185       else if(str=="udp-sndbuf-errors")
1186         return std::stoull(parts[6]);
1187       else if(str=="udp-noport-errors")
1188         return std::stoull(parts[2]);
1189       else if(str=="udp-in-errors")
1190         return std::stoull(parts[3]);
1191       else
1192         return 0;
1193     }
1194   }
1195 #endif
1196   return 0;
1197 }
1198
1199 bool getTSIGHashEnum(const DNSName& algoName, TSIGHashEnum& algoEnum)
1200 {
1201   if (algoName == DNSName("hmac-md5.sig-alg.reg.int") || algoName == DNSName("hmac-md5"))
1202     algoEnum = TSIG_MD5;
1203   else if (algoName == DNSName("hmac-sha1"))
1204     algoEnum = TSIG_SHA1;
1205   else if (algoName == DNSName("hmac-sha224"))
1206     algoEnum = TSIG_SHA224;
1207   else if (algoName == DNSName("hmac-sha256"))
1208     algoEnum = TSIG_SHA256;
1209   else if (algoName == DNSName("hmac-sha384"))
1210     algoEnum = TSIG_SHA384;
1211   else if (algoName == DNSName("hmac-sha512"))
1212     algoEnum = TSIG_SHA512;
1213   else if (algoName == DNSName("gss-tsig"))
1214     algoEnum = TSIG_GSS;
1215   else {
1216      return false;
1217   }
1218   return true;
1219 }
1220
1221 DNSName getTSIGAlgoName(TSIGHashEnum& algoEnum)
1222 {
1223   switch(algoEnum) {
1224   case TSIG_MD5: return DNSName("hmac-md5.sig-alg.reg.int.");
1225   case TSIG_SHA1: return DNSName("hmac-sha1.");
1226   case TSIG_SHA224: return DNSName("hmac-sha224.");
1227   case TSIG_SHA256: return DNSName("hmac-sha256.");
1228   case TSIG_SHA384: return DNSName("hmac-sha384.");
1229   case TSIG_SHA512: return DNSName("hmac-sha512.");
1230   case TSIG_GSS: return DNSName("gss-tsig.");
1231   }
1232   throw PDNSException("getTSIGAlgoName does not understand given algorithm, please fix!");
1233 }
1234
1235 uint64_t getOpenFileDescriptors(const std::string&)
1236 {
1237 #ifdef __linux__
1238   DIR* dirhdl=opendir(("/proc/"+std::to_string(getpid())+"/fd/").c_str());
1239   if(!dirhdl)
1240     return 0;
1241
1242   struct dirent *entry;
1243   int ret=0;
1244   while((entry = readdir(dirhdl))) {
1245     uint32_t num;
1246     try {
1247       num = pdns_stou(entry->d_name);
1248     } catch (...) {
1249       continue; // was not a number.
1250     }
1251     if(std::to_string(num) == entry->d_name)
1252       ret++;
1253   }
1254   closedir(dirhdl);
1255   return ret;
1256
1257 #else
1258   return 0;
1259 #endif
1260 }
1261
1262 uint64_t getRealMemoryUsage(const std::string&)
1263 {
1264 #ifdef __linux__
1265   ifstream ifs("/proc/self/statm");
1266   if(!ifs)
1267     return 0;
1268
1269   uint64_t size, resident, shared, text, lib, data;
1270   ifs >> size >> resident >> shared >> text >> lib >> data;
1271
1272   return data * getpagesize();
1273 #else
1274   struct rusage ru;
1275   if (getrusage(RUSAGE_SELF, &ru) != 0)
1276     return 0;
1277   return ru.ru_maxrss * 1024;
1278 #endif
1279 }
1280
1281
1282 uint64_t getSpecialMemoryUsage(const std::string&)
1283 {
1284 #ifdef __linux__
1285   ifstream ifs("/proc/self/smaps");
1286   if(!ifs)
1287     return 0;
1288   string line;
1289   uint64_t bytes=0;
1290   string header("Private_Dirty:");
1291   while(getline(ifs, line)) {
1292     if(boost::starts_with(line, header)) {
1293       bytes += std::stoull(line.substr(header.length() + 1))*1024;
1294     }
1295   }
1296   return bytes;
1297 #else
1298   return 0;
1299 #endif
1300 }
1301
1302 uint64_t getCPUTimeUser(const std::string&)
1303 {
1304   struct rusage ru;
1305   getrusage(RUSAGE_SELF, &ru);
1306   return (ru.ru_utime.tv_sec*1000ULL + ru.ru_utime.tv_usec/1000);
1307 }
1308
1309 uint64_t getCPUTimeSystem(const std::string&)
1310 {
1311   struct rusage ru;
1312   getrusage(RUSAGE_SELF, &ru);
1313   return (ru.ru_stime.tv_sec*1000ULL + ru.ru_stime.tv_usec/1000);
1314 }
1315
1316 double DiffTime(const struct timespec& first, const struct timespec& second)
1317 {
1318   int seconds=second.tv_sec - first.tv_sec;
1319   int nseconds=second.tv_nsec - first.tv_nsec;
1320
1321   if(nseconds < 0) {
1322     seconds-=1;
1323     nseconds+=1000000000;
1324   }
1325   return seconds + nseconds/1000000000.0;
1326 }
1327
1328 double DiffTime(const struct timeval& first, const struct timeval& second)
1329 {
1330   int seconds=second.tv_sec - first.tv_sec;
1331   int useconds=second.tv_usec - first.tv_usec;
1332
1333   if(useconds < 0) {
1334     seconds-=1;
1335     useconds+=1000000;
1336   }
1337   return seconds + useconds/1000000.0;
1338 }
1339
1340 uid_t strToUID(const string &str)
1341 {
1342   uid_t result = 0;
1343   const char * cstr = str.c_str();
1344   struct passwd * pwd = getpwnam(cstr);
1345
1346   if (pwd == NULL) {
1347     long long val;
1348
1349     try {
1350       val = stoll(str);
1351     }
1352     catch(std::exception& e) {
1353       throw runtime_error((boost::format("Error: Unable to parse user ID %s") % cstr).str() );
1354     }
1355
1356     if (val < std::numeric_limits<uid_t>::min() || val > std::numeric_limits<uid_t>::max()) {
1357       throw runtime_error((boost::format("Error: Unable to parse user ID %s") % cstr).str() );
1358     }
1359
1360     result = static_cast<uid_t>(val);
1361   }
1362   else {
1363     result = pwd->pw_uid;
1364   }
1365
1366   return result;
1367 }
1368
1369 gid_t strToGID(const string &str)
1370 {
1371   gid_t result = 0;
1372   const char * cstr = str.c_str();
1373   struct group * grp = getgrnam(cstr);
1374
1375   if (grp == NULL) {
1376     long long val;
1377
1378     try {
1379       val = stoll(str);
1380     }
1381     catch(std::exception& e) {
1382       throw runtime_error((boost::format("Error: Unable to parse group ID %s") % cstr).str() );
1383     }
1384
1385     if (val < std::numeric_limits<gid_t>::min() || val > std::numeric_limits<gid_t>::max()) {
1386       throw runtime_error((boost::format("Error: Unable to parse group ID %s") % cstr).str() );
1387     }
1388
1389     result = static_cast<gid_t>(val);
1390   }
1391   else {
1392     result = grp->gr_gid;
1393   }
1394
1395   return result;
1396 }
1397
1398 unsigned int pdns_stou(const std::string& str, size_t * idx, int base)
1399 {
1400   if (str.empty()) return 0; // compatibility
1401   unsigned long result;
1402   try {
1403     result = std::stoul(str, idx, base);
1404   }
1405   catch(std::invalid_argument& e) {
1406     throw std::invalid_argument(string(e.what()) + "; (invalid argument during std::stoul); data was \""+str+"\"");
1407   }
1408   catch(std::out_of_range& e) {
1409     throw std::out_of_range(string(e.what()) + "; (out of range during std::stoul); data was \""+str+"\"");
1410   }
1411   if (result > std::numeric_limits<unsigned int>::max()) {
1412     throw std::out_of_range("stoul returned result out of unsigned int range; data was \""+str+"\"");
1413   }
1414   return static_cast<unsigned int>(result);
1415 }
1416
1417 bool isSettingThreadCPUAffinitySupported()
1418 {
1419 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
1420   return true;
1421 #else
1422   return false;
1423 #endif
1424 }
1425
1426 int mapThreadToCPUList(pthread_t tid, const std::set<int>& cpus)
1427 {
1428 #ifdef HAVE_PTHREAD_SETAFFINITY_NP
1429 #  ifdef __NetBSD__
1430   cpuset_t *cpuset;
1431   cpuset = cpuset_create();
1432   for (const auto cpuID : cpus) {
1433     cpuset_set(cpuID, cpuset);
1434   }
1435
1436   return pthread_setaffinity_np(tid,
1437                                 cpuset_size(cpuset),
1438                                 cpuset);
1439 #  else
1440 #    ifdef __FreeBSD__
1441 #      define cpu_set_t cpuset_t
1442 #    endif
1443   cpu_set_t cpuset;
1444   CPU_ZERO(&cpuset);
1445   for (const auto cpuID : cpus) {
1446     CPU_SET(cpuID, &cpuset);
1447   }
1448
1449   return pthread_setaffinity_np(tid,
1450                                 sizeof(cpuset),
1451                                 &cpuset);
1452 #  endif
1453 #else
1454   return ENOSYS;
1455 #endif /* HAVE_PTHREAD_SETAFFINITY_NP */
1456 }
1457
1458 std::vector<ComboAddress> getResolvers(const std::string& resolvConfPath)
1459 {
1460   std::vector<ComboAddress> results;
1461
1462   ifstream ifs(resolvConfPath);
1463   if (!ifs) {
1464     return results;
1465   }
1466
1467   string line;
1468   while(std::getline(ifs, line)) {
1469     boost::trim_right_if(line, is_any_of(" \r\n\x1a"));
1470     boost::trim_left(line); // leading spaces, let's be nice
1471
1472     string::size_type tpos = line.find_first_of(";#");
1473     if (tpos != string::npos) {
1474       line.resize(tpos);
1475     }
1476
1477     if (boost::starts_with(line, "nameserver ") || boost::starts_with(line, "nameserver\t")) {
1478       vector<string> parts;
1479       stringtok(parts, line, " \t,"); // be REALLY nice
1480       for(vector<string>::const_iterator iter = parts.begin() + 1; iter != parts.end(); ++iter) {
1481         try {
1482           results.emplace_back(*iter, 53);
1483         }
1484         catch(...)
1485         {
1486         }
1487       }
1488     }
1489   }
1490
1491   return results;
1492 }
1493
1494 size_t getPipeBufferSize(int fd)
1495 {
1496 #ifdef F_GETPIPE_SZ
1497   int res = fcntl(fd, F_GETPIPE_SZ);
1498   if (res == -1) {
1499     return 0;
1500   }
1501   return res;
1502 #else
1503   errno = ENOSYS;
1504   return 0;
1505 #endif /* F_GETPIPE_SZ */
1506 }
1507
1508 bool setPipeBufferSize(int fd, size_t size)
1509 {
1510 #ifdef F_SETPIPE_SZ
1511   if (size > std::numeric_limits<int>::max()) {
1512     errno = EINVAL;
1513     return false;
1514   }
1515   int newSize = static_cast<int>(size);
1516   int res = fcntl(fd, F_SETPIPE_SZ, newSize);
1517   if (res == -1) {
1518     return false;
1519   }
1520   return true;
1521 #else
1522   errno = ENOSYS;
1523   return false;
1524 #endif /* F_SETPIPE_SZ */
1525 }