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 <config.h>
  23 #include <libtest/common.h>
  24
  25 #include <cassert>
  26 #include <cstdlib>
  27 #include <cstring>
  28 #include <ctime>
  29 #include <fnmatch.h>
  30 #include <iostream>
  31 #include <sys/socket.h>
  32 #include <sys/stat.h>
  33 #include <sys/time.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <unistd.h>
  37
  38 #include <signal.h>
  39
  40 #include <libtest/stats.h>
  41 #include <libtest/signal.h>
  42
  43 #ifndef __INTEL_COMPILER
  44 #pragma GCC diagnostic ignored "-Wold-style-cast"
  45 #endif
  46
  47 using namespace libtest;
  48
  49 struct socket_st {
  50   std::vector<int> fd;
  51
  52   ~socket_st()
  53   {
  54     for(std::vector<int>::iterator iter= fd.begin(); iter != fd.end(); iter++)
  55     {
  56       close(*iter);
  57     }
  58   }
  59 };
  60
  61 static socket_st all_socket_fd;
  62
  63 static in_port_t global_port= 0;
  64
  65 namespace libtest {
  66
  67 in_port_t default_port()
  68 {
  69   if (global_port == 0)
  70   {
  71     global_port= get_free_port();
  72   }
  73
  74   return global_port;
  75 }
  76
  77 in_port_t get_free_port()
  78 {
  79   in_port_t ret_port= in_port_t(0);
  80
  81   int retries= 1024;
  82
  83   while (retries--)
  84   {
  85     int sd;
  86     if ((sd= socket(AF_INET, SOCK_STREAM, 0)) != -1)
  87     {
  88       int optval= 1;
  89       if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) != -1)
  90       {
  91         struct sockaddr_in sin;
  92         sin.sin_port= 0;
  93         sin.sin_addr.s_addr= 0;
  94         sin.sin_addr.s_addr= INADDR_ANY;
  95         sin.sin_family= AF_INET;
  96
  97         if (bind(sd, (struct sockaddr *)&sin,sizeof(struct sockaddr_in) ) != -1)
  98         {
  99           socklen_t addrlen= sizeof(sin);
 100
 101           if (getsockname(sd, (struct sockaddr *)&sin, &addrlen) != -1)
 102           {
 103             ret_port= sin.sin_port;
 104           }
 105         }
 106       }
 107
 108       all_socket_fd.fd.push_back(sd);
 109     }
 110
 111     if (ret_port > 1024)
 112     {
 113       break;
 114     }
 115   }
 116
 117   // We handle the case where if we max out retries, we still abort.
 118   if (ret_port <= 1024)
 119   {
 120     fatal_message("No port could be found");
 121   }
 122
 123   return ret_port;
 124 }
 125
 126 } // namespace libtest