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%%	options

copyright owner =       Dirk Krause
copyright year  =       2015-xxxx
license         =       bsd



%%	module

#include "dk4conf.h"
#include "dk4types.h"
#include "dk4error.h"
#include "dk4sock.h"
#include "dk4sto.h"



$!trace-include



#if DK4_HAVE_STRUCT_SOCKADDR_IN6

/**	Compare IPv6 address structures.
	@param	left	Left address in comparison.
	@param	mask	Network mask to use, may be NULL.
	@param	right	Right address in comparison.
	@return	-1, 0 or 1 if l<r, l==r or l>r.
*/
static
int
dk4socket_compare_in6_addr3(
  const struct in6_addr	*left,
  const struct in6_addr	*mask,
  const struct in6_addr	*right
)
{
  const unsigned char	*ucl;
  const unsigned char	*ucm;
  const unsigned char 	*ucr;
  unsigned char  ul;
  unsigned char  ur;
  size_t	 i;

  int		 back = 0;
  ucl = &(left->s6_addr[0]);
  ucm = &(mask->s6_addr[0]);
  ucr = &(right->s6_addr[0]);
  for (i = 0; ((16 > i) && (0 == back)); i++) {
    ul = ucl[i];
    ur = ucr[i];
    if (NULL != mask) {
      ul &= ucm[i];
      ur &= ucm[i];
    }
    if (ul > ur) {
      back = 1;
    } else {
      if (ul < ur) {
        back = -1;
      }
    }
  }
  return back;
}

#endif



int
dk4socket_allowed_peer_compare(
  const void	*pl,
  const void	*pr,
  int		 cr
)
{
  const dk4_allowed_peer_t	*ppl;
  const dk4_allowed_peer_t	*ppr;
  const struct sockaddr		*pso;
  const struct sockaddr_in	*ps4;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
  const struct sockaddr_in6	*ps6;
#endif
  unsigned long			 ul1;
  unsigned long			 ul2;
  unsigned long			 ul3;
  int				 back = 0;
  $? "+ dk4socket_allowed_peer_compare %d", cr
  if (NULL != pl) {
    if (NULL != pr) {
      switch (cr) {
        case 1: {		$? ". peer /sockaddr"
	  ppl = (const dk4_allowed_peer_t *)pl;
	  pso = (const struct sockaddr *)pr;
	  $? ". ppl->af = %d   pso->af = %d", ppl->af, pso->sa_family
	  if (ppl->af < pso->sa_family) {	$? ". families differ"
	    back = -1;
	  } else {
	    if (ppl->af > pso->sa_family) {	$? ". families differ"
	      back = 1;
	    }
	  }
	  if (0 == back) {			$? ". same family"
	    switch (ppl->af) {
	      case AF_INET : {			$? ". IPv4"
	        ul1 = (ppl->data).ipv4.ad.s_addr;
		ul3 = (ppl->data).ipv4.ma.s_addr;
		ps4 = (const struct sockaddr_in *)pso;
		ul2 = ps4->sin_addr.s_addr;
		ul1 = dk4socket_ntohl(ul1);
		ul2 = dk4socket_ntohl(ul2);
		ul3 = dk4socket_ntohl(ul3);
		$? ". ul1 = %lu.%lu.%lu.%lu", ((ul1 >> 24) & 0xFFUL), ((ul1 >> 16) & 0xFFUL), ((ul1 >> 8) & 0xFFUL), (ul1 & 0xFFUL)
		$? ". ul2 = %lu.%lu.%lu.%lu", ((ul2 >> 24) & 0xFFUL), ((ul2 >> 16) & 0xFFUL), ((ul2 >> 8) & 0xFFUL), (ul2 & 0xFFUL)
		$? ". ul3 = %lu.%lu.%lu.%lu", ((ul3 >> 24) & 0xFFUL), ((ul3 >> 16) & 0xFFUL), ((ul3 >> 8) & 0xFFUL), (ul3 & 0xFFUL)
		ul1 &= ul3;
		ul2 &= ul3;
		$? ". ul1 = %lu.%lu.%lu.%lu", ((ul1 >> 24) & 0xFFUL), ((ul1 >> 16) & 0xFFUL), ((ul1 >> 8) & 0xFFUL), (ul1 & 0xFFUL)
		$? ". ul2 = %lu.%lu.%lu.%lu", ((ul2 >> 24) & 0xFFUL), ((ul2 >> 16) & 0xFFUL), ((ul2 >> 8) & 0xFFUL), (ul2 & 0xFFUL)
		if (ul1 > ul2) {
		  back = 1;
		} else {
		  if (ul1 < ul2) {
		    back = -1;
		  }
		}
	      } break;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
	      case AF_INET6 : {			$? ". IPv6"
	        ps6 = (const struct sockaddr_in6 *)pso;
		back = dk4socket_compare_in6_addr3(
		  &((ppl->data).ipv6.ad),
		  &((ppl->data).ipv6.ma),
		  &(ps6->sin6_addr)
		);
	      } break;
#endif
	    }
	  }
	} break;
	default : {			$? ". peer / peer"
	  ppl = (const dk4_allowed_peer_t *)pl;
	  ppr = (const dk4_allowed_peer_t *)pr;
	  if (ppl->af < ppr->af) {
	    back = -1;
	  } else {
	    if (ppl->af > ppr->af) {
	      back = 1;
	    }
	  }
	  if (0 == back) {
	    switch (ppl->af) {
	      case AF_INET : {
	        ul1 = (ppl->data).ipv4.ad.s_addr;
		ul2 = (ppr->data).ipv4.ad.s_addr;
		ul1 = dk4socket_ntohl(ul1);
		ul2 = dk4socket_ntohl(ul2);
		if (ul1 > ul2) {
		  back = 1;
		} else {
		  if (ul1 < ul2) {
		    back = -1;
		  }
		}
	        ul1 = (ppl->data).ipv4.ma.s_addr;
		ul2 = (ppr->data).ipv4.ma.s_addr;
		ul1 = dk4socket_ntohl(ul1);
		ul2 = dk4socket_ntohl(ul2);
		if (ul1 > ul2) {
		  back = 1;
		} else {
		  if (ul1 < ul2) {
		    back = -1;
		  }
		}
	      } break;
#if DK4_HAVE_STRUCT_SOCKADDR_IN6
	      case AF_INET6 : {
		back = dk4socket_compare_in6_addr3(
		  &((ppl->data).ipv6.ad),
		  NULL,
		  &((ppr->data).ipv6.ad)
		);
		if (0 == back) {
		  back = dk4socket_compare_in6_addr3(
		    &((ppl->data).ipv6.ma),
		    NULL,
		    &((ppr->data).ipv6.ma)
		  );
		}
	      } break;
#endif
	    }
	  }
	} break;
      }
    } else { back= 1; }
  } else {
    if (NULL != pr) { back = -1; }
  } $? "- dk4socket_allowed_peer_compare %d", back
  return back;
}