From 6cccbab7cc7f749dbec8f204bb3b84aa0e135454 Mon Sep 17 00:00:00 2001
From: Nic Boet <nic@boet.cc>
Date: Sun, 13 Nov 2022 23:55:00 -0600
Subject: [PATCH] BUFRSZ too small truncating arc sig

Senders using MS Exchange / Outlook / M365 cloud hosted mail chains many
headers together

The ARC-Message-Signature body as truncating at 1024 resulting in
incomplete ARC headers

Unclear which BUFRSZ capped so doubled them all.
---
 libopenarc/arc-internal.h | 2 +-
 libopenarc/arc.c          | 2 +-
 openarc/config.c          | 2 +-
 openarc/openarc-ar.c      | 2 +-
 openarc/openarc.h         | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/libopenarc/arc-internal.h b/libopenarc/arc-internal.h
index c8efd623..f6e80bbe 100644
--- a/libopenarc/arc-internal.h
+++ b/libopenarc/arc-internal.h
@@ -48,7 +48,7 @@
 #endif /* __STDC__ */
 
 /* limits, macros, etc. */
-#define	BUFRSZ			1024	/* base temp buffer size */
+#define	BUFRSZ			2048	/* base temp buffer size */
 #define	BASE64SIZE(x)		(((x + 2) / 3) * 4)
 					/* base64 encoding growth ratio */
 #define MAXADDRESS		256	/* biggest user@host we accept */
diff --git a/libopenarc/arc.c b/libopenarc/arc.c
index 1c6c9ded..41aba1e0 100644
--- a/libopenarc/arc.c
+++ b/libopenarc/arc.c
@@ -77,7 +77,7 @@ void arc_error __P((ARC_MESSAGE *, const char *, ...));
 
 #define	CRLF			"\r\n"
 
-#define	BUFRSZ			1024
+#define	BUFRSZ			2048
 #define	DEFERRLEN		128
 #define	DEFTIMEOUT		10
 
diff --git a/openarc/config.c b/openarc/config.c
index cf5e5cec..e769702b 100644
--- a/openarc/config.c
+++ b/openarc/config.c
@@ -37,7 +37,7 @@
 #include "config.h"
 
 /* limits */
-#define	BUFRSZ		1024		/* generic buffer size */
+#define	BUFRSZ		2048		/* generic buffer size */
 #define	MAXLEVEL	5		/* max. include recursion */
 
 #ifndef FALSE
diff --git a/openarc/openarc-ar.c b/openarc/openarc-ar.c
index 48acec62..52b6cf41 100644
--- a/openarc/openarc-ar.c
+++ b/openarc/openarc-ar.c
@@ -761,7 +761,7 @@ main(int argc, char **argv)
 	char *p;
 	char *progname;
 	struct authres ar;
-	u_char buf[1024];
+	u_char buf[2048];
 	u_char *toks[NTOKENS];
 
 	progname = (p = strrchr(argv[0], '/')) == NULL ? argv[0] : p + 1;
diff --git a/openarc/openarc.h b/openarc/openarc.h
index a413baa9..5004eee6 100644
--- a/openarc/openarc.h
+++ b/openarc/openarc.h
@@ -42,7 +42,7 @@
 #endif /* !TRUE */
 
 /* defaults, limits, etc. */
-#define	BUFRSZ		1024
+#define	BUFRSZ		2048
 #define CONFIGOPTS	"Ac:flnp:P:rt:u:vV"
 #define	DEFCONFFILE	CONFIG_BASE "/openarc.conf"
 #define	DEFINTERNAL	"csl:127.0.0.1,::1"