A new API function PacketAliasRedirectDynamic() can be used

to mark a fully specified static link as dynamic; i.e. make
it a one-time link.

3 files changed, 36 insertions, 1 deletions

diff --git a/sys/netinet/libalias/alias.h b/sys/netinet/libalias/alias.h
index eab4044..eb35bf7 100644
--- a/sys/netinet/libalias/alias.h
+++ b/sys/netinet/libalias/alias.h
@@ -69,6 +69,7 @@ int	 PacketAliasAddServer(struct alias_link *_link,
 struct alias_link *
 	 PacketAliasRedirectAddr(struct in_addr _src_addr,
 	    struct in_addr _alias_addr);
+int	 PacketAliasRedirectDynamic(struct alias_link *_link);
 void	 PacketAliasRedirectDelete(struct alias_link *_link);
 struct alias_link *
 	 PacketAliasRedirectPort(struct in_addr _src_addr,
diff --git a/sys/netinet/libalias/alias_db.c b/sys/netinet/libalias/alias_db.c
index 1b59b05..84b38ae 100644
--- a/sys/netinet/libalias/alias_db.c
+++ b/sys/netinet/libalias/alias_db.c
@@ -2358,6 +2358,7 @@ UninitPacketAliasLog(void)
     PacketAliasAddServer()
     PacketAliasRedirectProto()
     PacketAliasRedirectAddr()
+    PacketAliasRedirectDynamic()
     PacketAliasRedirectDelete()
     PacketAliasSetAddress()
     PacketAliasInit()
@@ -2499,6 +2500,20 @@ PacketAliasRedirectAddr(struct in_addr src_addr,
 }
 
 
+/* Mark the aliasing link dynamic */
+int
+PacketAliasRedirectDynamic(struct alias_link *link)
+{
+
+    if (link->flags & LINK_PARTIALLY_SPECIFIED)
+	return (-1);
+    else {
+	link->flags &= ~LINK_PERMANENT;
+	return (0);
+    }
+}
+
+
 void
 PacketAliasRedirectDelete(struct alias_link *link)
 {
diff --git a/sys/netinet/libalias/libalias.3 b/sys/netinet/libalias/libalias.3
index 71735b2..6eb4f4b 100644
--- a/sys/netinet/libalias/libalias.3
+++ b/sys/netinet/libalias/libalias.3
@@ -545,7 +545,26 @@ the
 .Fa port
 argument is ignored and could have any value, e.g. htons(~0).
 .Pp
-This function returns 0 on success, -1 otherwise.
+This function returns 0 on success, \-1 otherwise.
+.Ed
+.Pp
+.Ft int
+.Fn PacketAliasRedirectDynamic "struct alias_link *link"
+.Bd -ragged -offset indent
+This function marks the specified static redirect rule entered by
+.Fn PacketAliasRedirectPort
+as dynamic.
+This can be used to e.g. dynamically redirect a single TCP connection,
+after which the rule is removed.
+Only fully specified links can be made dynamic.
+(See the
+.Sx STATIC AND DYNAMIC LINKS
+and
+.Sx PARTIALLY SPECIFIED ALIASING LINKS
+sections below for a definition of static vs. dynamic,
+and partially vs. fully specified links.)
+.Pp
+This function returns 0 on success, \-1 otherwise.
 .Ed
 .Pp
 .Ft void