getaddr
p = getaddr(&stack);
int getaddr(int, int, char *, struct hostent **);
getaddr(RTA_IFA, af, src, NULL);
getaddr(RTA_IFA, af, *++argv, NULL);
getaddr(RTA_IFP, AF_LINK, *++argv, NULL);
getaddr(RTA_GATEWAY, af, *++argv, NULL);
ishost = getaddr(RTA_DST, af, *++argv, &hp);
getaddr(RTA_NETMASK, af, *++argv, NULL);
ishost = getaddr(RTA_DST, af, *argv, &hp);
getaddr(RTA_GATEWAY, af, *argv, &hp);
getaddr(RTA_NETMASK, af, s, NULL);