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

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
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  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  36
  37 #include <config.h>
  38 #include <libtest/common.h>
  39
  40 #include <cassert>
  41 #include <cstdlib>
  42 #include <cstring>
  43 #include <ctime>
  44 #include <fnmatch.h>
  45 #include <iostream>
  46 #include <sys/socket.h>
  47 #include <sys/stat.h>
  48 #include <sys/time.h>
  49 #include <sys/types.h>
  50 #include <sys/wait.h>
  51 #include <unistd.h>
  52
  53 #include <signal.h>
  54
  55 #include <libtest/signal.h>
  56
  57 #ifndef __INTEL_COMPILER
  58 #pragma GCC diagnostic ignored "-Wold-style-cast"
  59 #endif
  60
  61 using namespace libtest;
  62
  63 struct socket_st {
  64   std::vector<int> fd;
  65
  66   ~socket_st()
  67   {
  68     for(std::vector<int>::iterator iter= fd.begin(); iter != fd.end(); iter++)
  69     {
  70       close(*iter);
  71     }
  72   }
  73 };
  74
  75 static socket_st all_socket_fd;
  76
  77 static in_port_t global_port= 0;
  78
  79 namespace libtest {
  80
  81 in_port_t default_port()
  82 {
  83   if (global_port == 0)
  84   {
  85     global_port= get_free_port();
  86   }
  87
  88   return global_port;
  89 }
  90
  91 in_port_t get_free_port()
  92 {
  93   in_port_t ret_port= in_port_t(0);
  94
  95   int retries= 1024;
  96
  97   while (retries--)
  98   {
  99     int sd;
 100     if ((sd= socket(AF_INET, SOCK_STREAM, 0)) != -1)
 101     {
 102       int optval= 1;
 103       if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) != -1)
 104       {
 105         struct sockaddr_in sin;
 106         sin.sin_port= 0;
 107         sin.sin_addr.s_addr= 0;
 108         sin.sin_addr.s_addr= INADDR_ANY;
 109         sin.sin_family= AF_INET;
 110
 111         if (bind(sd, (struct sockaddr *)&sin,sizeof(struct sockaddr_in) ) != -1)
 112         {
 113           socklen_t addrlen= sizeof(sin);
 114
 115           if (getsockname(sd, (struct sockaddr *)&sin, &addrlen) != -1)
 116           {
 117             ret_port= sin.sin_port;
 118           }
 119         }
 120       }
 121
 122       all_socket_fd.fd.push_back(sd);
 123     }
 124
 125     if (ret_port > 1024)
 126     {
 127       break;
 128     }
 129   }
 130
 131   // We handle the case where if we max out retries, we still abort.
 132   if (ret_port <= 1024)
 133   {
 134     fatal_message("No port could be found");
 135   }
 136
 137   return ret_port;
 138 }
 139
 140 } // namespace libtest