/*

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

 */

#include "config.h"

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <stdio.h>

#include <arpa/inet.h>

#include "isc_netaddr.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

  )

{

  char *buf = lib_getbuf();

  socktoa_r(sock, buf, LIB_BUFLENGTH);

  return buf;

}

const char *

socktoa_r(

  const sockaddr_u *sock, char *buf, size_t buflen

  )

{

  int   saved_errno;

  unsigned long scope;

  saved_errno = errno;

  if (NULL == sock) {

    strlcpy(buf, "(null)", buflen);

  } else {

    switch(AF(sock)) {

    case AF_INET:

      inet_ntop(AF_INET, PSOCK_ADDR4(sock), buf, buflen);

      break;

    case AF_INET6:

      inet_ntop(AF_INET6, PSOCK_ADDR6(sock), buf, buflen);

      scope = SCOPE_VAR(sock);

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

        char buf2[LIB_BUFLENGTH];

        snprintf(buf2, sizeof(buf2), "%s%%%lu",

           buf, scope);

        buf2[LIB_BUFLENGTH - 1] = '\0';

        strlcpy(buf, buf2, buflen);

      }

      break;

    default:

      snprintf(buf, buflen,

         "(socktoa unknown family %d)",

         AF(sock));

    }

  }

  errno = saved_errno;

  return buf;

}

const char *

sockporttoa(

  const sockaddr_u *sock

  )

{

  char *buf = lib_getbuf();

  sockporttoa_r(sock, buf, LIB_BUFLENGTH);

  return buf;

}

const char *

sockporttoa_r(

  const sockaddr_u *sock, char *buf, size_t buflen

  )

{

  int saved_errno;

        char buf2[LIB_BUFLENGTH];

  saved_errno = errno;

  socktoa_r(sock, buf2, sizeof(buf2));

  snprintf(buf, buflen,

     (IS_IPV6(sock))

         ? "[%s]:%hu"

         : "%s:%hu",

     buf2, (unsigned short)SRCPORT(sock));

  errno = saved_errno;

  return buf;

}

/*

 * sock_hash - hash a sockaddr_u structure

 */

unsigned int

sock_hash(

  const sockaddr_u *addr

  )

{

  unsigned int hashVal;

  size_t len;

  const uint8_t *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;

        default:

                /* huh? */

                break;

  }

  for (unsigned int j = 0; j < len ; j++) {

    hashVal = 37 * hashVal + pch[j];

  }

  return hashVal;

}