noip.[c1]: New configuration feature for setting local addresses.

[preload-hacks] / noip.1

diff --git a/noip.1 b/noip.1
index 8ab355f..a79a872 100644 (file)
--- a/noip.1
+++ b/noip.1
@@ -175,6 +175,43 @@ rules are appended on the end.  Currently, the rules in
 are also put at the end (before the
 .B _AFTER
 rules), though this may change later.
+.TP
+.BI "impbind " bind-rule
+Add an entry to the implicit-bind rule list.  When a program attempts to
+.BR connect (2)
+a socket without binding its local address first,
+.B noip
+consults this list to decide on the correct local address to assign.
+Each entry in the list has the form
+.RS
+.IP
+.I address-range
+.IR address | \c
+.B same
+.PP
+The rules are tried in order: if the remote address matches (in the same
+way as in an ACL entry) the address range on the left side of the rule,
+then the socket is bound to the address from the right side; if the
+address on the right is
+.B same
+then the remote address is used.
+.PP
+Three environment variables
+are consulted too:
+.BR NOIP_IMPBIND_BEFORE ,
+.BR NOIP_IMPBIND ,
+and
+.BR NOIP_IMPBIND_AFTER .
+The
+.B _BEFORE
+rules are inserted at the front of the list; the
+.B _AFTER
+rules are appended on the end.  Currently, the rules in
+.B NOIP_IMPBIND
+are also put at the end (before the
+.B _AFTER
+rules), though this may change later.
+.RE
 .PP
 (Aside: An attempt to connect to a remote host may not be a hopeless failure,
 even if a real IP socket is denied:
@@ -189,16 +226,9 @@ An
 is a comma-separated list of entries of the form:
 .IP
 .BR + | \-
-.IR address \c
-.RB [ \- \c
-.IR address | \c
-.BR / \c
-.IR prefix-length ]| \c
-.BR local | any
+.I address-range
 .RB [ : \c
-.IR port [ \c
-.BI \- \c
-.IR port ]]
+.IR port-range ]
 .PP
 (The spaces in the above are optional.)
 .PP
@@ -209,7 +239,9 @@ or
 .I denied
 .RB (` \- ').
 .PP
-The IP-address portion may be any of the following
+The
+.I address-range
+portion may be any of the following.
 .TP
 .B any
 Matches all addresses.
@@ -231,8 +263,9 @@ over octets to the right.
 .IB address / prefix-length
 Matches an address in the given network.
 .PP
-The port portion may be omitted (which means `match any port'), or may
-be a single
+The
+.I port-range
+may be omitted (which means `match any port'), or may be a single
 .I port
 or a range
 .IB port \- port