commit 1470eab31452d2fab50bc4965320dab7892b2ef3
from: Omar Polo <op@omarpolo.com>
date: Tue Jul 27 08:41:42 2021 UTC

fix bufferevent tls I/O on libevent2

on libevent2 we need to wrap evbuffer_add with
evbuffer_freeze/evbuffer_unfreeze.  Not sure exactly why, probably
because we're doing some evbuffer_enable/disable/enable-again.

Retain compatibility with the custom libevent1 in base on OpenBSD.

commit - 4b435a4c4739dd67d3bc01e6b106969aaec431fe
commit + 1470eab31452d2fab50bc4965320dab7892b2ef3
blob - 8b206a283d35811665b2746568819d0e900f694a
blob + fe3986726839aa4acc7348a550215fc3d21423d5
--- compat.h
+++ compat.h
@@ -26,6 +26,21 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#if HAVE_EVENT2
+# include <event2/event.h>
+# include <event2/event_compat.h>
+# include <event2/event_struct.h>
+# include <event2/buffer.h>
+# include <event2/buffer_compat.h>
+# include <event2/bufferevent.h>
+# include <event2/bufferevent_struct.h>
+# include <event2/bufferevent_compat.h>
+#else
+# include <event.h>
+# define evbuffer_freeze(a, b)		/* nop */
+# define evbuffer_unfreeze(a, b)	/* nop */
+#endif
+
 #ifdef HAVE_QUEUE_H
 # include <sys/queue.h>
 #else
blob - 1ce2e137610fed82acd579fb91d15a1d9c59c0a9
blob + 2f11d8c301b3c0d0919551f3c356150037cef3ef
--- configure.ac
+++ configure.ac
@@ -1,5 +1,6 @@
 AC_INIT([telescope], [0.4.1-dev], [telescope@omarpolo.com], [telescope], [gemini://telescope.omarpolo.com])
 AC_CONFIG_LIBOBJ_DIR(compat)
+AC_CANONICAL_HOST
 AM_INIT_AUTOMAKE([-Wall foreign subdir-objects])
 AC_PROG_CC_C99
 AC_USE_SYSTEM_EXTENSIONS
@@ -54,9 +55,19 @@ AC_CHECK_LIB(tls, tls_init, [], [
 	AC_MSG_ERROR([requires libtls])
 ])
 
-AC_CHECK_LIB(event, event_init, [], [
-	AC_MSG_ERROR([requires libevent])
-])
+case "$host_os" in
+	*openbsd*)
+		AC_CHECK_LIB([event], [event_init], [],
+			[AC_MSG_ERROR([requires libevent])])
+		;;
+	*)
+		PKG_CHECK_MODULES([libevent2], [libevent_core >= 2], [
+			AC_DEFINE([HAVE_EVENT2], 1, [1 if using event2])
+			CFLAGS="$libevent2_CFLAGS $CFLAGS"
+			LIBS="$libevent2_LIBS $LIBS"
+		], [AC_MSG_ERROR([requires libevent])])
+		;;
+esac
 
 AC_CHECK_LIB(util, imsg_init, [], [
 	AC_LIBOBJ(imsg)
blob - 3ecdbf56350b04d3746fe0bc220158cda280467e
blob + b75f88940adb4ad75a48fe23dcfda700b9cb517c
--- net.c
+++ net.c
@@ -378,6 +378,7 @@ net_tls_readcb(int fd, short event, void *d)
 	char			 buf[IBUF_READ_SIZE];
 	int			 what = EVBUFFER_READ;
 	int			 howmuch = IBUF_READ_SIZE;
+	int			 res;
 	ssize_t			 ret;
 	size_t			 len;
 
@@ -404,7 +405,10 @@ net_tls_readcb(int fd, short event, void *d)
 		goto err;
 	}
 
-	if (evbuffer_add(bufev->input, buf, len) == -1) {
+	evbuffer_unfreeze(bufev->input, 0);
+	res = evbuffer_add(bufev->input, buf, len);
+	evbuffer_freeze(bufev->input, 0);
+	if (res == -1) {
 		what |= EVBUFFER_ERROR;
 		goto err;
 	}
blob - b557a96f53d24ed8af96b580b6cd797fea965893
blob + 7c4ee68d7d4edd32bfa32690932f387072b825f8
--- telescope.h
+++ telescope.h
@@ -21,7 +21,6 @@
 #include "compat.h"
 #include "phos/phos.h"
 
-#include <event.h>
 #include <limits.h>
 
 #define MIN(a, b) ((a) < (b) ? (a) : (b))