From 43216f633409410bfae9cf59d84582407bace9e3 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 21 Mar 2017 06:03:40 +0100
Subject: make generation of boundary not break any pipes

---
 sendmailadvanced.in | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/sendmailadvanced.in b/sendmailadvanced.in
index 5608ed2..f362500 100755
--- a/sendmailadvanced.in
+++ b/sendmailadvanced.in
@@ -68,6 +68,20 @@ gpgAdressaten() {
   done
 }
 
+gen_boundary() {
+  [ -n "$1" ] && len=$1 || len=33
+  local bnd
+  bnd=''
+  while [ "${#bnd}" -lt ${len} ]; do
+    bnd="${bnd}$(
+      head -c1 /dev/urandom | \
+        base64 -w0 | \
+        tr -d '/+='
+    )"
+  done
+  echo "${bnd}"
+}
+
 datei=""
 encrypt=true
 stamp=true
@@ -250,13 +264,7 @@ fi
       echo "${body}" | \
         grep -q "${boundary}"
     do
-      boundary="$(
-        set +o pipefail
-        base64 -w0 < /dev/urandom | \
-          tr -d [/+] | \
-          head -c 33
-      )"
-      true
+      boundary="$(gen_boundary)"
     done
 
     echo 'MIME-Version: 1.0'
-- 
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