fmt_ip6ifc(3) Library Functions Manual fmt_ip6ifc(3)NAME
fmt_ip6ifc - write a formatted ASCII representation of an IPv6 number
SYNTAX
#include <ip6.h>
unsigned int fmt_ip6ifc(char *dest,const char ip[16],uint32 scope_id);
DESCRIPTION
fmt_ip6ifc formats an IPv6 number in ASCII representation from ip and writes the result into dest. It returns the number of bytes written.
fmt_ip6ifc will apply "::" compression to the output.
If ip is an IPv4-mapped IPv6 address, fmt_ip6ifc will output it as IPv4 address.
If dest equals FMT_LEN (i.e. is zero), fmt_ip6ifc returns the number of bytes it would have written.
fmt_ip6 does not append .
ip6.h defines the integer IP6_FMT to be big enough to contain every possible fmt_ip6 output plus . However, for fmt_ip6ifc you need to
add 1 for the '%' and IF_NAMESIZE from <net/if.h> for the interface name.
EXAMPLE
#include <ip6.h>
char buf[IP6_FMT];
char ip[16];
scope_id sid;
buf[fmt_ip6ifc(buf,ip,sid)]=0;
SEE ALSO scan_ip6(3), fmt_ip4(3)fmt_ip6ifc(3)
Check Out this Related Man Page
FAITH(4) BSD Kernel Interfaces Manual FAITH(4)NAME
faith -- IPv6-to-IPv4 TCP relay capturing interface
SYNOPSIS
pseudo-device faith [count]
DESCRIPTION
The faith interface captures IPv6 TCP traffic, for implementing userland IPv6-to-IPv4 TCP relay like faithd(8).
Special action will be taken when IPv6 TCP traffic is seen on a router, and routing table suggests to route it to faith interface. In this
case, the packet will be accepted by the router, regardless of list of IPv6 interface addresses assigned to the router. The packet will be
captured by an IPv6 TCP socket, if it has IN6P_FAITH flag turned on and it has matching address/port pairs. In result, faith will let you
capture IPv6 TCP traffic to some specific destination addresses. Userland programs, such as faithd(8) can use this behavior to relay IPv6
TCP traffic to IPv4 TCP traffic. The program can accept some specific IPv6 TCP traffic, perform getsockname(2) to get the IPv6 destination
address specified by the client, and perform application-specific address mapping to relay IPv6 TCP to IPv4 TCP.
The IN6P_FAITH flag on IPv6 TCP socket can be set by using setsockopt(2), with level equals to IPPROTO_IPV6 and optname equals to IPv6_FAITH.
To handle error reports by ICMPv6, some of ICMPv6 packets routed to faith interface will be delivered to IPv6 TCP, as well.
To understand how faith can be used, take a look at source code of faithd(8).
As faith interface implements potentially dangerous operation, great care must be taken when configuring faith interface. To avoid possible
misuse, sysctl(8) variable net.inet6.ip6.keepfaith must be set to 1 prior to the use of the interface. When net.inet6.ip6.keepfaith is 0, no
packet will be captured by faith interface.
faith interface is intended to be used on routers, not on hosts.
SEE ALSO inet(4), inet6(4), faithd(8)
Jun-ichiro itojun Hagino and Kazu Yamamoto, An IPv6-to-IPv4 transport relay translator, internet draft, draft-ietf-ngtrans-tcpudp-
relay-04.txt, work in progress material.
HISTORY
The FAITH IPv6-to-IPv4 TCP relay translator was first appeared in WIDE hydrangea IPv6 stack.
BSD April 10, 1999 BSD
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