/* include readable_v61 */#include	"icmpd.h"#include	<netinet/in_systm.h>#include	<netinet/ip.h>#include	<netinet/ip_icmp.h>#include	<netinet/udp.h>#ifdef	IPV6#include	"ip6.h"			/* should be <netinet/ip6.h> */#include	"icmp6.h"		/* should be <netinet/icmp6.h> */#endifintreadable_v6(void){#ifdef	IPV6	int					i, hlen1, hlen2, icmp6len, sport;	char				buf[MAXLINE];	char				srcstr[INET6_ADDRSTRLEN], dststr[INET6_ADDRSTRLEN];	ssize_t				n;	socklen_t			len;	struct ip6_hdr		*ip6, *hip6;	struct icmp6_hdr	*icmp6;	struct udphdr		*udp;	struct sockaddr_in6	from, dest;	struct icmpd_err	icmpd_err;	len = sizeof(from);	n = Recvfrom(fd6, buf, MAXLINE, 0, (SA *) &from, &len);	printf("%d bytes ICMPv6 from %s:",		   n, Sock_ntop_host((SA *) &from, len));	ip6 = (struct ip6_hdr *) buf;		/* start of IPv6 header */	hlen1 = sizeof(struct ip6_hdr);	if (ip6->ip6_nxt != IPPROTO_ICMPV6)		err_quit("next header not IPPROTO_ICMPV6");	icmp6 = (struct icmp6_hdr *) (buf + hlen1);	if ( (icmp6len = n - hlen1) < 8)		err_quit("icmp6len (%d) < 8", icmp6len);	printf(" type = %d, code = %d\n", icmp6->icmp6_type, icmp6->icmp6_code);/* end readable_v61 *//* include readable_v62 */	if (icmp6->icmp6_type == ICMP6_DST_UNREACH ||		icmp6->icmp6_type == ICMP6_PACKET_TOO_BIG ||		icmp6->icmp6_type == ICMP6_TIME_EXCEEDED) {		if (icmp6len < 8 + 40 + 8)			err_quit("icmp6len (%d) < 8 + 40 + 8", icmp6len);		hip6 = (struct ip6_hdr *) (buf + hlen1 + 8);		hlen2 = sizeof(struct ip6_hdr);		printf("\tsrcip = %s, dstip = %s, next hdr = %d\n",			   Inet_ntop(AF_INET6, &hip6->ip6_src, srcstr, sizeof(srcstr)),			   Inet_ntop(AF_INET6, &hip6->ip6_dst, dststr, sizeof(dststr)),			   hip6->ip6_nxt); 		if (hip6->ip6_nxt == IPPROTO_UDP) {			udp = (struct udphdr *) (buf + hlen1 + 8 + hlen2);			sport = udp->uh_sport;				/* 4find client's Unix domain socket, send headers */			for (i = 0; i <= maxi; i++) {				if (client[i].connfd >= 0 &&					client[i].family == AF_INET6 &&					client[i].lport == sport) {					bzero(&dest, sizeof(dest));					dest.sin6_family = AF_INET6;#ifdef	HAVE_SOCKADDR_SA_LEN					dest.sin6_len = sizeof(dest);#endif					memcpy(&dest.sin6_addr, &hip6->ip6_dst,						   sizeof(struct in6_addr));					dest.sin6_port = udp->uh_dport;					icmpd_err.icmpd_type = icmp6->icmp6_type;					icmpd_err.icmpd_code = icmp6->icmp6_code;					icmpd_err.icmpd_len = sizeof(struct sockaddr_in6);					memcpy(&icmpd_err.icmpd_dest, &dest, sizeof(dest));						/* 4convert type & code to reasonable errno value */					icmpd_err.icmpd_errno = EHOSTUNREACH;	/* default */					if (icmp6->icmp6_type == ICMP6_DST_UNREACH) {						if (icmp6->icmp6_code == ICMP_UNREACH_PORT)							icmpd_err.icmpd_errno = ECONNREFUSED;						else if (icmp6->icmp6_code == ICMP_UNREACH_NEEDFRAG)							icmpd_err.icmpd_errno = EMSGSIZE;					}					Write(client[i].connfd, &icmpd_err, sizeof(icmpd_err));				}			}		}	}	return(--nready);#endif}/* end readable_v62 */