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   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
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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 <utility>
  54 #include <vector>
  55
  56 #include <signal.h>
  57
  58 #include <libtest/signal.h>
  59
  60 #ifndef __INTEL_COMPILER
  61 #pragma GCC diagnostic ignored "-Wold-style-cast"
  62 #endif
  63
  64 using namespace libtest;
  65
  66 struct socket_st {
  67   typedef std::vector< std::pair< int, in_port_t> > socket_port_t;
  68   socket_port_t _pair;
  69
  70   void release(in_port_t _arg)
  71   {
  72     for (socket_port_t::iterator iter= _pair.begin();
  73          iter != _pair.end();
  74          ++iter)
  75     {
  76       if ((*iter).second == _arg)
  77       {
  78         shutdown((*iter).first, SHUT_RDWR);
  79         close((*iter).first);
  80       }
  81     }
  82   }
  83
  84   ~socket_st()
  85   {
  86     for (socket_port_t::iterator iter= _pair.begin();
  87          iter != _pair.end();
  88          ++iter)
  89     {
  90       shutdown((*iter).first, SHUT_RDWR);
  91       close((*iter).first);
  92     }
  93   }
  94 };
  95
  96 static socket_st all_socket_fd;
  97
  98 static in_port_t global_port= 0;
  99
 100 namespace libtest {
 101
 102 in_port_t default_port()
 103 {
 104   if (global_port == 0)
 105   {
 106     global_port= get_free_port();
 107   }
 108
 109   return global_port;
 110 }
 111
 112 void release_port(in_port_t arg)
 113 {
 114   all_socket_fd.release(arg);
 115 }
 116
 117 in_port_t get_free_port()
 118 {
 119   in_port_t ret_port= in_port_t(0);
 120
 121   int retries= 1024;
 122
 123   while (--retries)
 124   {
 125     int sd;
 126     if ((sd= socket(AF_INET, SOCK_STREAM, 0)) != -1)
 127     {
 128       int optval= 1;
 129       if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) != -1)
 130       {
 131         struct sockaddr_in sin;
 132         sin.sin_port= 0;
 133         sin.sin_addr.s_addr= 0;
 134         sin.sin_addr.s_addr= INADDR_ANY;
 135         sin.sin_family= AF_INET;
 136
 137         if (bind(sd, (struct sockaddr *)&sin,sizeof(struct sockaddr_in) ) != -1)
 138         {
 139           socklen_t addrlen= sizeof(sin);
 140
 141           if (getsockname(sd, (struct sockaddr *)&sin, &addrlen) != -1)
 142           {
 143             ret_port= sin.sin_port;
 144           }
 145         }
 146       }
 147
 148       all_socket_fd._pair.push_back(std::make_pair(sd, ret_port));
 149     }
 150
 151     if (ret_port > 1024)
 152     {
 153       break;
 154     }
 155   }
 156
 157   // We handle the case where if we max out retries, we still abort.
 158   if (retries == 0)
 159   {
 160     fatal_message("No port could be found, exhausted retry");
 161   }
 162
 163   if (ret_port == 0)
 164   {
 165     fatal_message("No port could be found");
 166   }
 167
 168   if (ret_port <= 1024)
 169   {
 170     fatal_message("No port could be found, though some where available below or at 1024");
 171   }
 172
 173   return ret_port;
 174 }
 175
 176 } // namespace libtest