Fix keyboard related issues on Ubuntu 18.04

On Ubuntu 18.04, the keyboard was not properly handled in PROX
For instance, many keys pressed were silently discarded.

The issue is related to a change in histedit/libedit version.
Recent libedit have (silently) changed the prototype of the get_char function
passed in el_set(el, EL_GETCFN, get_char), with some input parameters
changing from char to wchar_t.
As PROX used the old prototype (char based), this resulted in some
uninitialized field (= garbage) in the wchar_t, causing libedit to discard
the character.

PROX now uses different get_char prototypes, depending of the libedit version
being used.

If PROX was already compiled and a the OS is updated (e.g. from Ubuntu 16.04
to Ubuntu 18.04), this will require a 'make clean'.

Change-Id: Icb0e555a21e13cdaf98172bad17f2f838fb7bc3a
Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

2 files changed, 34 insertions, 1 deletions

diff --git a/VNFs/DPPD-PROX/Makefile b/VNFs/DPPD-PROX/Makefile
index fe8e87da..b6cc603a 100644
--- a/VNFs/DPPD-PROX/Makefile
+++ b/VNFs/DPPD-PROX/Makefile
@@ -174,8 +174,10 @@ SRCS-y += handle_ipv6_tunnel.c
 SRCS-y += handle_read.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_AESNI_MB) += handle_esp.c
 ifneq ($(CONFIG_RTE_LIBRTE_PMD_AESNI_MB),y)
+ifeq ($(FIRST_PROX_MAKE),)
 $(warning "Building w/o IPSEC support")
 endif
+endif
 SRCS-y += handle_cgnat.c
 SRCS-y += handle_nat.c
 SRCS-y += handle_dump.c
@@ -209,11 +211,33 @@ ifeq ($(FIRST_PROX_MAKE),)
 MAKEFLAGS += --no-print-directory
 FIRST_PROX_MAKE = 1
 export FIRST_PROX_MAKE
-all:
+all:	libedit_autoconf.h
 	@./helper-scripts/trailing.sh
 	@$(MAKE) $@
+clean:
+	$(Q) $(RM) -- 'libedit_autoconf.h'
+	@$(MAKE) $@
 %::
 	@$(MAKE) $@
+
+ifeq ($(call rte_ver_LT,17,2,0,0),y)
+AUTO-CONFIG-SCRIPT = $(RTE_SDK)/scripts/auto-config-h.sh
+else
+AUTO-CONFIG-SCRIPT = $(RTE_SDK)/buildtools/auto-config-h.sh
+endif
+
+# DPDK CFLAGS prevents auto-conf program to properly compile
+export CFLAGS=
+# if el_rfunc_t exists, define HAVE_LIBEDIT_EL_RFUNC_T so that PROX knows it can use it
+libedit_autoconf.h: $(AUTO-CONFIG-SCRIPT)
+	$(Q) $(RM) -- '$@'
+	$(Q) sh -- '$(AUTO-CONFIG-SCRIPT)' '$@' \
+		HAVE_LIBEDIT_EL_RFUNC_T \
+		histedit.h \
+		type 'el_rfunc_t' \
+		> /dev/null
+# auto-conf adds empty line at the end of the file, considered as error by trailing.sh script
+	$(Q) sed -i '$$ d' '$@'
 else
 include $(RTE_SDK)/mk/rte.extapp.mk
 endif
diff --git a/VNFs/DPPD-PROX/input_curses.c b/VNFs/DPPD-PROX/input_curses.c
index 6f79869b..4ea2e4a8 100644
--- a/VNFs/DPPD-PROX/input_curses.c
+++ b/VNFs/DPPD-PROX/input_curses.c
@@ -27,6 +27,7 @@
 #include "cmd_parser.h"
 #include "input_curses.h"
 #include "histedit.h"
+#include "libedit_autoconf.h"
 
 static EditLine *el;
 static History *hist;
@@ -124,7 +125,11 @@ static int peek_stdin(void)
 	return FD_ISSET(fileno(stdin), &in_fd);
 }
 
+#ifdef HAVE_LIBEDIT_EL_RFUNC_T
+static int do_get_char(EditLine *e, wchar_t *c)
+#else
 static int get_char(EditLine *e, char *c)
+#endif
 {
 	*c = display_getch();
 
@@ -167,6 +172,10 @@ static int get_char(EditLine *e, char *c)
 	return 1;
 }
 
+#ifdef HAVE_LIBEDIT_EL_RFUNC_T
+static el_rfunc_t get_char = &do_get_char;
+#endif
+
 static void proc_keyboard(struct input *input)
 {
 	const char *line;