text: /*
   * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
   *                         University Research and Technology
   *                         Corporation.  All rights reserved.
   * Copyright (c) 2004-2005 The University of Tennessee and The University
   *                         of Tennessee Research Foundation.  All rights
   *                         reserved.
   * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
   *                         University of Stuttgart.  All rights reserved.
   * Copyright (c) 2004-2005 The Regents of the University of California.
   *                         All rights reserved.
   * Copyright (c) 2007      Los Alamos National Security, LLC.  All rights
   *                         reserved.
   * Copyright (c) 2009-2015 Cisco Systems, Inc.  All rights reserved.
   * Copyright (c) 2013      Intel, Inc.  All rights reserved.
   * Copyright (c) 2015      Research Organization for Information Science
   *                         and Technology (RIST). All rights reserved.
   * $COPYRIGHT$
   *
   * Additional copyrights may follow
   *
   * $HEADER$
   */
  
  #include "opal_config.h"
  
  #include <stdio.h>
  #include <string.h>
  #ifdef HAVE_UNISTD_H
  #include <unistd.h>
  #endif
  #include <errno.h>
  #ifdef HAVE_SYS_TYPES_H
  #include <sys/types.h>
  #endif
  #ifdef HAVE_SYS_SOCKET_H
  #include <sys/socket.h>
  #endif
  #ifdef HAVE_SYS_SOCKIO_H
  #include <sys/sockio.h>
  #endif
  #ifdef HAVE_SYS_IOCTL_H
  #include <sys/ioctl.h>
  #endif
  #ifdef HAVE_NETINET_IN_H
  #include <netinet/in.h>
  #endif
  #ifdef HAVE_ARPA_INET_H
  #include <arpa/inet.h>
  #endif
  #ifdef HAVE_NET_IF_H
  #if defined(__APPLE__) && defined(_LP64)
  /* Apple engineering suggested using options align=power as a
     workaround for a bug in OS X 10.4 (Tiger) that prevented ioctl(...,
     SIOCGIFCONF, ...) from working properly in 64 bit mode on Power PC.
     It turns out that the underlying issue is the size of struct
     ifconf, which the kernel expects to be 12 and natural 64 bit
     alignment would make 16.  The same bug appears in 64 bit mode on
     Intel macs, but align=power is a no-op there, so instead, use the
     pack pragma to instruct the compiler to pack on 4 byte words, which
     has the same effect as align=power for our needs and works on both
     Intel and Power PC Macs. */
  #pragma pack(push,4)
  #endif
  #include <net/if.h>
  #if defined(__APPLE__) && defined(_LP64)
  #pragma pack(pop)
  #endif
  #endif
  #ifdef HAVE_NETDB_H
  #include <netdb.h>
  #endif
  #ifdef HAVE_IFADDRS_H
  #include <ifaddrs.h>
  #endif
  
  #include "opal/util/net.h"
  #include "opal/util/output.h"
  #include "opal/util/argv.h"
  #include "opal/util/show_help.h"
  #include "opal/constants.h"
  #include "opal/threads/tsd.h"
  #include "opal/runtime/opal_params.h"
  
  /* this function doesn't depend on sockaddr_h */
  bool opal_net_isaddr(const char *name)
  {
      struct addrinfo hint, *res = NULL;
  
      /* initialize the hint */
      memset(&hint, '\0', sizeof hint);
  
      /* indicate that we don't know the family */
      hint.ai_family = PF_UNSPEC;
      hint.ai_flags = AI_NUMERICHOST;
  
      if (0 != getaddrinfo(name, NULL, &hint, &res)) {
          /* the input wasn't a recognizable address */
          return false;
      }
      /* we don't care what family - all we care is that
       * it is indeed an address
       */
      freeaddrinfo(res);
      return true;
  }
  
  #ifdef HAVE_STRUCT_SOCKADDR_IN
  
  typedef struct private_ipv4_t {
      in_addr_t addr;
      uint32_t netmask_bits;
  } private_ipv4_t;
  
  static private_ipv4_t* private_ipv4 = NULL;
  
  #if OPAL_ENABLE_IPV6
  static opal_tsd_key_t hostname_tsd_key;
  
  
  static void
  hostname_cleanup(void *value)
  {
      if (NULL != value) free(value);
  }
  
  
  static char*
  get_hostname_buffer(void)
  {
      void *buffer;
      int ret;
  
      ret = opal_tsd_getspecific(hostname_tsd_key, &buffer);
      if (OPAL_SUCCESS != ret) return NULL;
  
      if (NULL == buffer) {
          buffer = (void*) malloc((NI_MAXHOST + 1) * sizeof(char));
          ret = opal_tsd_setspecific(hostname_tsd_key, buffer);
      }
  
      return (char*) buffer;
  }
  #endif
  
  int
  opal_net_init(void)
  {
      char **args, *arg;
      uint32_t a, b, c, d, bits, addr;
      int i, count, found_bad = 0;
  
      args = opal_argv_split( opal_net_private_ipv4, ';' );
      if( NULL != args ) {
          count = opal_argv_count(args);
          private_ipv4 = (private_ipv4_t*)malloc( (count + 1) * sizeof(private_ipv4_t));
          if( NULL == private_ipv4 ) {
              opal_output(0, "Unable to allocate memory for the private addresses array" );
              opal_argv_free(args);
              goto do_local_init;
          }
          for( i = 0; i < count; i++ ) {
              arg = args[i];
  
              (void)sscanf( arg, "%u.%u.%u.%u/%u", &a, &b, &c, &d, &bits );
  
              if( (a > 255) || (b > 255) || (c > 255) ||
                  (d > 255) || (bits > 32) ) {
                  if (0 == found_bad) {
                      opal_show_help("help-opal-util.txt",
                                     "malformed net_private_ipv4",
                                     true, args[i]);
                      found_bad = 1;
                  }
                  continue;
              }
              addr = (a << 24) | (b << 16) | (c << 8) | d;
              private_ipv4[i].addr = htonl(addr);
              private_ipv4[i].netmask_bits = bits;
          }
          private_ipv4[i].addr         = 0;
          private_ipv4[i].netmask_bits = 0;
          opal_argv_free(args);
      }
  
   do_local_init:
  #if OPAL_ENABLE_IPV6
      return opal_tsd_key_create(&hostname_tsd_key, hostname_cleanup);
  #else
      return OPAL_SUCCESS;
  #endif
  }
  
  
  int
  opal_net_finalize()
  {
      free(private_ipv4);
      private_ipv4 = NULL;
  
      return OPAL_SUCCESS;
  }
  
  
  /* convert a CIDR prefixlen to netmask (in network byte order) */
  uint32_t
  opal_net_prefix2netmask(uint32_t prefixlen)
  {
      return htonl (((1 << prefixlen) - 1) << (32 - prefixlen));
  }
  
  
  bool
  opal_net_islocalhost(const struct sockaddr *addr)
  {
      switch (addr->sa_family) {
      case AF_INET:
          {
              const struct sockaddr_in *inaddr = (struct sockaddr_in*) addr;
              /* if it's in the 127. domain, it shouldn't be routed
                 (0x7f == 127) */
              if (0x7F000000 == (0x7F000000 & ntohl(inaddr->sin_addr.s_addr))) {
                  return true;
              }
              return false;
          }
          break;
  #if OPAL_ENABLE_IPV6
      case AF_INET6:
          {
              const struct sockaddr_in6 *inaddr = (struct sockaddr_in6*) addr;
              if (IN6_IS_ADDR_LOOPBACK (&inaddr->sin6_addr)) {
                 return true; /* Bug, FIXME: check for 127.0.0.1/8 */
              }
              return false;
          }
          break;
  #endif
  
      default:
          opal_output(0, "unhandled sa_family %d passed to opal_net_islocalhost",
                      addr->sa_family);
          return false;
          break;
      }
  }
  
  
  bool
  opal_net_samenetwork(const struct sockaddr *addr1,
                       const struct sockaddr *addr2,
                       uint32_t plen)
  {
      uint32_t prefixlen;
  
      if(addr1->sa_family != addr2->sa_family) {
          return false; /* address families must be equal */
      }
  
      switch (addr1->sa_family) {
      case AF_INET:
          {
              if (0 == plen) {
                  prefixlen = 32;
              } else {
                  prefixlen = plen;
              }
              struct sockaddr_in inaddr1, inaddr2;
              /* Use temporary variables and memcpy's so that we don't
                 run into bus errors on Solaris/SPARC */
              memcpy(&inaddr1, addr1, sizeof(inaddr1));
              memcpy(&inaddr2, addr2, sizeof(inaddr2));
              uint32_t netmask = opal_net_prefix2netmask (prefixlen);
  
              if((inaddr1.sin_addr.s_addr & netmask) ==
                 (inaddr2.sin_addr.s_addr & netmask)) {
                  return true;
              }
              return false;
          }
          break;
  #if OPAL_ENABLE_IPV6
      case AF_INET6:
          {
              struct sockaddr_in6 inaddr1, inaddr2;
              /* Use temporary variables and memcpy's so that we don't
                 run into bus errors on Solaris/SPARC */
              memcpy(&inaddr1, addr1, sizeof(inaddr1));
              memcpy(&inaddr2, addr2, sizeof(inaddr2));
              struct in6_addr *a6_1 = (struct in6_addr*) &inaddr1.sin6_addr;
              struct in6_addr *a6_2 = (struct in6_addr*) &inaddr2.sin6_addr;
  
              if (0 == plen) {
                  prefixlen = 64;
              } else {
                  prefixlen = plen;
              }
              if (64 == prefixlen) {
                  /* prefixlen is always /64, any other case would be routing.
                     Compare the first eight bytes (64 bits) and hope that
                     endianess is not an issue on any system as long as
                     addresses are always stored in network byte order.
                  */
                  if (((const uint32_t *) (a6_1))[0] ==
                      ((const uint32_t *) (a6_2))[0] &&
                      ((const uint32_t *) (a6_1))[1] ==
                      ((const uint32_t *) (a6_2))[1]) {
                      return true;
                  }
              }
              return false;
          }
          break;
  #endif
      default:
          opal_output(0, "unhandled sa_family %d passed to opal_samenetwork",
                      addr1->sa_family);
      }
  
      return false;
  }
  
  
  /**
   * Returns true if the given address is a public IPv4 address.
   */
  bool
  opal_net_addr_isipv4public(const struct sockaddr *addr)
  {
      switch (addr->sa_family) {
  #if OPAL_ENABLE_IPV6
          case AF_INET6:
              return false;
  #endif
          case AF_INET:
              {
                  const struct sockaddr_in *inaddr = (struct sockaddr_in*) addr;
                  int i;
  
                  if( NULL == private_ipv4 ) {
                      return true;
                  }
  
                  for( i = 0; private_ipv4[i].addr != 0; i++ ) {
                      if( private_ipv4[i].addr == (inaddr->sin_addr.s_addr &
                                                   opal_net_prefix2netmask(private_ipv4[i].netmask_bits)) )
                          return false;
                  }
  
              }
              return true;
          default:
              opal_output (0,
                           "unhandled sa_family %d passed to opal_net_addr_isipv4public\n",
                           addr->sa_family);
      }
  
      return false;
  }
  
  bool
  opal_net_addr_isipv6linklocal(const struct sockaddr *addr)
  {
      struct sockaddr_in6 if_addr;
  
      switch (addr->sa_family) {
  #if OPAL_ENABLE_IPV6
          case AF_INET6:
              if_addr.sin6_family = AF_INET6;
              if (1 != inet_pton(AF_INET6, "fe80::0000", &if_addr.sin6_addr)) {
                  return false;
              }
              return opal_net_samenetwork(addr, (struct sockaddr*)&if_addr, 64);
  #endif
          case AF_INET:
              return false;
          default:
              opal_output (0,
                           "unhandled sa_family %d passed to opal_net_addr_isipv6linklocal\n",
                           addr->sa_family);
      }
  
      return false;
  }
  
  char*
  opal_net_get_hostname(const struct sockaddr *addr)
  {
  #if OPAL_ENABLE_IPV6
      char *name = get_hostname_buffer();
      int error;
      socklen_t addrlen;
      char *p;
  
      if (NULL == name) {
          opal_output(0, "opal_sockaddr2str: malloc() failed\n");
          return NULL;
      }
      OPAL_DEBUG_ZERO(*name);
  
      switch (addr->sa_family) {
      case AF_INET:
          addrlen = sizeof (struct sockaddr_in);
          break;
      case AF_INET6:
  #if defined( __NetBSD__)
          /* hotfix for netbsd: on my netbsd machine, getnameinfo
             returns an unkown error code. */
          if(NULL == inet_ntop(AF_INET6, &((struct sockaddr_in6*) addr)->sin6_addr,
                               name, NI_MAXHOST)) {
              opal_output(0, "opal_sockaddr2str failed with error code %d", errno);
              return NULL;
          }
          return name;
  #else
          addrlen = sizeof (struct sockaddr_in6);
  #endif
          break;
      default:
          return NULL;
      }
  
      error = getnameinfo(addr, addrlen,
                          name, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
  
      if (error) {
         int err = errno;
         opal_output (0, "opal_sockaddr2str failed:%s (return code %i)\n",
                      gai_strerror(err), error);
         return NULL;
      }
      /* strip any trailing % data as it isn't pertinent */
      if (NULL != (p = strrchr(name, '%'))) {
          *p = '\0';
      }
      return name;
  #else
      return inet_ntoa(((struct sockaddr_in*) addr)->sin_addr);
  #endif
  }
  
  
  int
  opal_net_get_port(const struct sockaddr *addr)
  {
      switch (addr->sa_family) {
      case AF_INET:
          return ntohs(((struct sockaddr_in*) addr)->sin_port);
          break;
  #if OPAL_ENABLE_IPV6
      case AF_INET6:
          return ntohs(((struct sockaddr_in6*) addr)->sin6_port);
          break;
  #endif
      }
  
      return -1;
  }
  
  
  #else /* HAVE_STRUCT_SOCKADDR_IN */
  
  int
  opal_net_init()
  {
      return OPAL_SUCCESS;
  }
  
  
  int
  opal_net_finalize()
  {
      return OPAL_SUCCESS;
  }
  
  
  uint32_t
  opal_net_prefix2netmask(uint32_t prefixlen)
  {
      return 0;
  }
  
  
  bool
  opal_net_islocalhost(const struct sockaddr *addr)
  {
      return false;
  }
  
  
  bool
  opal_net_samenetwork(const struct sockaddr *addr1,
                       const struct sockaddr *addr2,
                       uint32_t prefixlen)
  {
      return false;
  }
  
  
  bool
  opal_net_addr_isipv4public(const struct sockaddr *addr)
  {
      return false;
  }
  
  
  char*
  opal_net_get_hostname(const struct sockaddr *addr)
  {
      return NULL;
  }
  
  
  int
  opal_net_get_port(const struct sockaddr *addr)
  {
      return -1;
  }
  
  #endif /* HAVE_STRUCT_SOCKADDR_IN */
  