/*

 * socktoa.c  socktoa(), sockporttoa(), and sock_hash()

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <sys/types.h>

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>

#endif

#ifdef HAVE_NETINET_IN_H

#include <netinet/in.h>

#endif

#include <stdio.h>

#include <arpa/inet.h>

#include <isc/result.h>

#include <isc/netaddr.h>

#include <isc/sockaddr.h>

#include "ntp_fp.h"

#include "lib_strbuf.h"

#include "ntp_stdlib.h"

#include "ntp.h"

/*

 * socktoa - return a numeric host name from a sockaddr_storage structure

 */

const char *

socktoa(

  const sockaddr_u *sock

  )

{

  int   saved_errno;

  char *    res;

  char *    addr;

  u_long    scope;

  saved_errno = socket_errno();

  LIB_GETBUF(res);

  if (NULL == sock) {

    strlcpy(res, "(null)", LIB_BUFLENGTH);

  } else {

    switch(AF(sock)) {

    case AF_INET:

    case AF_UNSPEC:

      inet_ntop(AF_INET, PSOCK_ADDR4(sock), res,

          LIB_BUFLENGTH);

      break;

    case AF_INET6:

      inet_ntop(AF_INET6, PSOCK_ADDR6(sock), res,

          LIB_BUFLENGTH);

      scope = SCOPE_VAR(sock);

      if (0 != scope && !strchr(res, '%')) {

        addr = res;

        LIB_GETBUF(res);

        snprintf(res, LIB_BUFLENGTH, "%s%%%lu",

           addr, scope);

        res[LIB_BUFLENGTH - 1] = '\0';

      }

      break;

    default:

      snprintf(res, LIB_BUFLENGTH, 

         "(socktoa unknown family %d)", 

         AF(sock));

    }

  }

  errno = saved_errno;

  return res;

}

const char *

sockporttoa(

  const sockaddr_u *sock

  )

{

  int   saved_errno;

  const char *  atext;

  char *    buf;

  saved_errno = socket_errno();

  atext = socktoa(sock);

  LIB_GETBUF(buf);

  snprintf(buf, LIB_BUFLENGTH,

     (IS_IPV6(sock))

         ? "[%s]:%hu"

         : "%s:%hu",

     atext, SRCPORT(sock));

  errno = saved_errno;

  return buf;

}

/*

 * sock_hash - hash a sockaddr_u structure

 */

u_short

sock_hash(

  const sockaddr_u *addr

  )

{

  u_int hashVal;

  u_int j;

  size_t len;

  const u_char *pch;

  hashVal = 0;

  len = 0;

  /*

   * We can't just hash the whole thing because there are hidden

   * fields in sockaddr_in6 that might be filled in by recvfrom(),

   * so just use the family, port and address.

   */

  pch = (const void *)&AF(addr);

  hashVal = 37 * hashVal + *pch;

  if (sizeof(AF(addr)) > 1) {

    pch++;

    hashVal = 37 * hashVal + *pch;

  }

  switch(AF(addr)) {

  case AF_INET:

    pch = (const void *)&SOCK_ADDR4(addr);

    len = sizeof(SOCK_ADDR4(addr));

    break;

  case AF_INET6:

    pch = (const void *)&SOCK_ADDR6(addr);

    len = sizeof(SOCK_ADDR6(addr));

    break;

  }

  for (j = 0; j < len ; j++)

    hashVal = 37 * hashVal + pch[j];

  return (u_short)(hashVal & USHRT_MAX);

}

int

sockaddr_masktoprefixlen(

  const sockaddr_u *  psa

  )

{

  isc_netaddr_t isc_na;

  isc_sockaddr_t  isc_sa;

  u_int   pfxlen;

  isc_result_t  result;

  int   rc;

  ZERO(isc_sa);

  memcpy(&isc_sa.type, psa,

         min(sizeof(isc_sa.type), sizeof(*psa)));

  isc_netaddr_fromsockaddr(&isc_na, &isc_sa);

  result = isc_netaddr_masktoprefixlen(&isc_na, &pfxlen);

  rc = (ISC_R_SUCCESS == result)

     ? (int)pfxlen

     : -1;

  return rc;

}