packet/sockaddr.c

   1 #include <stddef.h>
   2 #include <sys/socket.h>
   3 #include <netinet/in.h>
   4 #include <arpa/inet.h>
   5
   6 void *sockaddr_addr_offset(const void *x)
   7 {
   8         if ( x == NULL )
   9                 return NULL;
  10
  11         if ( ((struct sockaddr *)(x))->sa_family == AF_INET )
  12         {
  13                 return ((void *)(x) + offsetof(struct sockaddr_in, sin_addr));
  14         } else
  15         if ( ((struct sockaddr *)(x))->sa_family == AF_INET6 )
  16         {
  17                 return ((void *)(x) + offsetof(struct sockaddr_in6, sin6_addr));
  18         }
  19
  20         return NULL;
  21 }
  22
  23 unsigned int sockaddr_addr_size(const void *x)
  24 {
  25         if ( x == NULL )
  26                 return 0;
  27         if ( ((struct sockaddr *)(x))->sa_family == AF_INET )
  28         {
  29                 return sizeof(struct in_addr);
  30         } else
  31         if ( ((struct sockaddr *)(x))->sa_family == AF_INET6 )
  32         {
  33                 return sizeof(struct in6_addr);
  34         }
  35         return 0;
  36 }
  37
  38
  39 unsigned int sockaddr_size(const void *x)
  40 {
  41         if ( x == NULL )
  42                 return 0;
  43         if ( ((struct sockaddr *)(x))->sa_family == AF_INET )
  44         {
  45                 return sizeof(struct sockaddr_in);
  46         } else
  47         if ( ((struct sockaddr *)(x))->sa_family == AF_INET6 )
  48         {
  49                 return sizeof(struct sockaddr_in6);
  50         }
  51         return 0;
  52 }
  53
  54 in_port_t *sockaddr_port_offset(const void *x)
  55 {
  56         if ( x == NULL )
  57                 return NULL;
  58
  59         if ( ((struct sockaddr *)(x))->sa_family == AF_INET )
  60         {
  61                 return ((void *)(x) + offsetof(struct sockaddr_in, sin_port));
  62         } else
  63         if ( ((struct sockaddr *)(x))->sa_family == AF_INET6 )
  64         {
  65                 return ((void *)(x) + offsetof(struct sockaddr_in6, sin6_port));
  66         }
  67
  68         return NULL;
  69 }