[bgpd] Add support for the old Linux 2.4, TCP_MD5_AUTH RFC2385 patch
* configure.ac: Add a --enable-linux24-tcp-md5 argument, to compile in
support for the old TCP-MD5 patch for Linux 2.4 systems. This overrides
auto-detection of TCP-MD5 supported by the target system.
* lib/sockopt.c: (sockopt_tcp_signature) add in a variant for the old
Linux 2.4, TCP_MD5_AUTH variant of TCP-MD5 support, conditional
on the previous configure arg.
diff --git a/lib/sockopt.c b/lib/sockopt.c
index 4ba7e87..d25d371 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -498,7 +498,30 @@
int
sockopt_tcp_signature (int sock, union sockunion *su, const char *password)
{
-#if HAVE_DECL_TCP_MD5SIG
+#if defined(HAVE_TCP_MD5_LINUX24) && defined(GNU_LINUX)
+ /* Support for the old Linux 2.4 TCP-MD5 patch, taken from Hasso Tepper's
+ * version of the Quagga patch (based on work by Rick Payne, and Bruce
+ * Simpson)
+ */
+#define TCP_MD5_AUTH 13
+#define TCP_MD5_AUTH_ADD 1
+#define TCP_MD5_AUTH_DEL 2
+ struct tcp_rfc2385_cmd {
+ u_int8_t command; /* Command - Add/Delete */
+ u_int32_t address; /* IPV4 address associated */
+ u_int8_t keylen; /* MD5 Key len (do NOT assume 0 terminated ascii) */
+ void *key; /* MD5 Key */
+ } cmd;
+ struct in_addr *addr = &su->sin.sin_addr;
+
+ cmd.command = (password != NULL ? TCP_MD5_AUTH_ADD : TCP_MD5_AUTH_DEL);
+ cmd.address = addr->s_addr;
+ cmd.keylen = (password != NULL ? strlen (password) : 0);
+ cmd.key = password;
+
+ return setsockopt (sock, IPPROTO_TCP, TCP_MD5_AUTH, &cmd, sizeof cmd);
+
+#elif HAVE_DECL_TCP_MD5SIG
int ret;
#ifndef GNU_LINUX
/*
@@ -559,5 +582,5 @@
return ret;
#else /* HAVE_TCP_MD5SIG */
return -2;
-#endif /* HAVE_TCP_MD5SIG */
+#endif /* !HAVE_TCP_MD5SIG */
}