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