git.m6w6.name Git - m6w6/libmemcached/blob - libtest/port.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  libtest
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 3 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 #include <libtest/common.h>
  23
  24 #include <cassert>
  25 #include <cstdlib>
  26 #include <cstring>
  27 #include <ctime>
  28 #include <fnmatch.h>
  29 #include <iostream>
  30 #include <sys/socket.h>
  31 #include <sys/stat.h>
  32 #include <sys/time.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35 #include <unistd.h>
  36
  37 #include <signal.h>
  38
  39 #include <libtest/stats.h>
  40 #include <libtest/signal.h>
  41
  42 #ifndef __INTEL_COMPILER
  43 #pragma GCC diagnostic ignored "-Wold-style-cast"
  44 #endif
  45
  46 using namespace libtest;
  47
  48 struct socket_st {
  49   std::vector<int> fd;
  50
  51   ~socket_st()
  52   {
  53     for(std::vector<int>::iterator iter= fd.begin(); iter != fd.end(); iter++)
  54     {
  55       close(*iter);
  56     }
  57   }
  58 };
  59
  60 static socket_st all_socket_fd;
  61
  62 static in_port_t global_port= 0;
  63
  64 namespace libtest {
  65
  66 in_port_t default_port()
  67 {
  68   if (global_port == 0)
  69   {
  70     global_port= get_free_port();
  71   }
  72
  73   return global_port;
  74 }
  75
  76 in_port_t get_free_port()
  77 {
  78   in_port_t ret_port= in_port_t(0);
  79
  80   int retries= 1024;
  81
  82   while (retries--)
  83   {
  84     int sd;
  85     if ((sd= socket(AF_INET, SOCK_STREAM, 0)) != -1)
  86     {
  87       int optval= 1;
  88       if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) != -1)
  89       {
  90         struct sockaddr_in sin;
  91         sin.sin_port= 0;
  92         sin.sin_addr.s_addr= 0;
  93         sin.sin_addr.s_addr= INADDR_ANY;
  94         sin.sin_family= AF_INET;
  95
  96         if (bind(sd, (struct sockaddr *)&sin,sizeof(struct sockaddr_in) ) != -1)
  97         {
  98           socklen_t addrlen= sizeof(sin);
  99
 100           if (getsockname(sd, (struct sockaddr *)&sin, &addrlen) != -1)
 101           {
 102             ret_port= sin.sin_port;
 103           }
 104         }
 105       }
 106
 107       all_socket_fd.fd.push_back(sd);
 108     }
 109
 110     if (ret_port > 1024)
 111     {
 112       break;
 113     }
 114   }
 115
 116   // We handle the case where if we max out retries, we still abort.
 117   if (ret_port <= 1024)
 118   {
 119     throw fatal_message("No port could be found");
 120   }
 121
 122   return ret_port;
 123 }
 124
 125 } // namespace libtest