nfct: remove lazy binding

Since cd5135377ac4 ("conntrackd: cthelper: Set up userspace helpers when
daemon starts"), userspace conntrack helpers do not depend on a previous
invocation of nfct to set up the userspace helpers.

Move helper definitions to nfct-extensions/helper.c since existing
deployments might still invoke nfct, even if not required anymore.

This patch was motivated by the removal of the lazy binding.

Phil Sutter says:

"For security purposes, distributions might want to pass -Wl,-z,now
linker flags to all builds, thereby disabling lazy binding globally.

In the past, nfct relied upon lazy binding: It uses the helper objects'
parsing functions without but doesn't provide all symbols the objects
use."

Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

5 files changed, 8 insertions, 36 deletions

diff --git a/src/helpers/Makefile.am b/src/helpers/Makefile.am
index e4f10c9..e458ab4 100644
--- a/src/helpers/Makefile.am
+++ b/src/helpers/Makefile.am
@@ -11,7 +11,7 @@ pkglib_LTLIBRARIES = ct_helper_amanda.la \
 		     ct_helper_slp.la	\
 		     ct_helper_ssdp.la
 
-HELPER_LDFLAGS = -avoid-version -module $(LIBNETFILTER_CONNTRACK_LIBS) $(LAZY_LDFLAGS)
+HELPER_LDFLAGS = -avoid-version -module $(LIBNETFILTER_CONNTRACK_LIBS)
 HELPER_CFLAGS = $(AM_CFLAGS) $(LIBNETFILTER_CONNTRACK_CFLAGS)
 
 ct_helper_amanda_la_SOURCES = amanda.c
diff --git a/src/helpers/ftp.c b/src/helpers/ftp.c
index 2505c71..29ac55c 100644
--- a/src/helpers/ftp.c
+++ b/src/helpers/ftp.c
@@ -36,17 +36,9 @@
 #include <libnetfilter_queue/pktbuff.h>
 #include <linux/netfilter.h>
 
-static bool loose; /* XXX: export this as config option. */
-
-#define NUM_SEQ_TO_REMEMBER 2
+#include "helpers/ftp.h"
 
-/* This structure exists only once per master */
-struct ftp_info {
-	/* Valid seq positions for cmd matching after newline */
-	uint32_t seq_aft_nl[MYCT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
-	/* 0 means seq_match_aft_nl not set */
-	int seq_aft_nl_num[MYCT_DIR_MAX];
-};
+static bool loose; /* XXX: export this as config option. */
 
 enum nf_ct_ftp_type {
 	/* PORT command from client */
diff --git a/src/helpers/rpc.c b/src/helpers/rpc.c
index 3b3d0a7..732e9ba 100644
--- a/src/helpers/rpc.c
+++ b/src/helpers/rpc.c
@@ -41,21 +41,12 @@
 #include <libnetfilter_queue/pktbuff.h>
 #include <linux/netfilter.h>
 
+#include "helpers/rpc.h"
+
 /* RFC 1050: RPC: Remote Procedure Call Protocol Specification Version 2 */
 /* RFC 1014: XDR: External Data Representation Standard */
 #define SUPPORTED_RPC_VERSION	2
 
-struct rpc_info {
-	/* XID */
-	uint32_t xid;
-	/* program */
-	uint32_t pm_prog;
-	/* program version */
-	uint32_t pm_vers;
-	/* transport protocol: TCP|UDP */
-	uint32_t pm_prot;
-};
-
 /* So, this packet has hit the connection tracking matching code.
    Mangle it, and change the expectation to match the new version. */
 static unsigned int
diff --git a/src/helpers/sane.c b/src/helpers/sane.c
index 2c07099..ebcb24c 100644
--- a/src/helpers/sane.c
+++ b/src/helpers/sane.c
@@ -39,11 +39,7 @@
 #include <libnetfilter_queue/libnetfilter_queue_tcp.h>
 #include <libnetfilter_queue/pktbuff.h>
 #include <linux/netfilter.h>
-
-enum sane_state {
-	SANE_STATE_NORMAL,
-	SANE_STATE_START_REQUESTED,
-};
+#include "helpers/sane.h"
 
 struct sane_request {
 	uint32_t RPC_code;
@@ -61,10 +57,6 @@ struct sane_reply_net_start {
 	/* other fields aren't interesting for conntrack */
 };
 
-struct nf_ct_sane_master {
-	enum sane_state state;
-};
-
 static int
 sane_helper_cb(struct pkt_buff *pkt, uint32_t protoff,
 		 struct myct *myct, uint32_t ctinfo)
diff --git a/src/helpers/tns.c b/src/helpers/tns.c
index 803f40a..5692f29 100644
--- a/src/helpers/tns.c
+++ b/src/helpers/tns.c
@@ -29,6 +29,8 @@
 #include <libnetfilter_queue/pktbuff.h>
 #include <linux/netfilter.h>
 
+#include "helpers/tns.h"
+
 /* TNS SQL*Net Version 2 */
 enum tns_types {
        TNS_TYPE_CONNECT        = 1,
@@ -58,11 +60,6 @@ struct tns_redirect {
        uint16_t data_len;
 };
 
-struct tns_info {
-       /* Scan next DATA|REDIRECT packet */
-       bool parse;
-};
-
 static int try_number(const char *data, size_t dlen, uint32_t array[],
 		      int array_size, char sep, char term)
 {