netauth
#define RIP_AUTH_MD5_HASH_XTRA (sizeof(struct netauth)-sizeof(struct a_md5))
struct netauth ru_auth[1];
struct netauth *na2;
na2 = (struct netauth *)((char *)rip+len);
struct netauth *na;
na = (struct netauth*)wb->n;
struct netauth *na, *na2;
na = (struct netauth*)wb->base;
na2 = (struct netauth*)wb->n;
struct netauth *na = OMSG.rip_auths;
struct netauth *na;
na = (struct netauth*)n;
# define NA ((struct netauth*)n)