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