dispose http(s) 416 error page as non-content

Real webservers (like apache) actually send an error page with a 416
response, but our client didn't expect it leaving the page on the socket
to be parsed as response for the next request (http) or as file content
(https), which isn't what we want at all… Symptom is a "Bad header line"
as html usually doesn't parse that well to an http-header.

This manifests itself e.g. if we have a complete file (or larger) in
partial/ which isn't discarded by If-Range as the server doesn't support
it (or it is just newer, think: mirror rotation).
It is a sort-of regression of 78c72d0ce22e00b194251445aae306df357d5c1a,
which removed the filesize - 1 trick, but this had its own problems…

To properly test this our webserver gains the ability to reply with
transfer-encoding: chunked as most real webservers will use it to send
the dynamically generated error pages.

(The tests and their binary helpers had to be slightly modified to
apply, but the patch to fix the issue itself is unchanged.)

Closes: 768797

3 files changed, 72 insertions, 20 deletions

diff --git a/test/integration/framework b/test/integration/framework
index df1942ff9..ac482a7a0 100644
--- a/test/integration/framework
+++ b/test/integration/framework
@@ -1064,8 +1064,8 @@ acquire::cdrom::autodetect 0;" > rootdir/etc/apt/apt.conf.d/00cdrom
 }
 
 downloadfile() {
-	local PROTO="$(echo "$1" | cut -d':' -f 1 )"
-	apthelper -o Debug::Acquire::${PROTO}=1 \
+	local PROTO="${1%%:*}"
+	apthelper -o Debug::Acquire::${PROTO}=1 -o Debug::pkgAcquire::Worker=1 \
 		download-file "$1" "$2" 2>&1 || true
 	# only if the file exists the download was successful
 	if [ -e "$2" ]; then
@@ -1221,7 +1221,7 @@ testsuccess() {
 		msgtest 'Test for successful execution of' "$*"
 	fi
 	local OUTPUT="${TMPWORKINGDIRECTORY}/rootdir/tmp/testsuccess.output"
-	if $@ >${OUTPUT} 2>&1; then
+	if "$@" >${OUTPUT} 2>&1; then
 		msgpass
 	else
 		echo >&2
diff --git a/test/integration/test-apt-helper b/test/integration/test-apt-helper
index c749224ca..31e471677 100755
--- a/test/integration/test-apt-helper
+++ b/test/integration/test-apt-helper
@@ -10,34 +10,36 @@ configarchitecture "i386"
 changetohttpswebserver
 
 test_apt_helper_download() {
-    echo "foo" > aptarchive/foo
+    echo 'foo' > aptarchive/foo
+    echo 'bar' > aptarchive/foo2
 
     msgtest 'apt-file download-file md5sum'
-    apthelper -qq download-file http://localhost:8080/foo foo2 MD5Sum:d3b07384d113edec49eaa6238ad5ff00 && msgpass || msgfail
+    testsuccess --nomsg apthelper download-file http://localhost:8080/foo foo2 MD5Sum:d3b07384d113edec49eaa6238ad5ff00
     testfileequal foo2 'foo'
 
     msgtest 'apt-file download-file sha1'
-    apthelper -qq download-file http://localhost:8080/foo foo1 SHA1:f1d2d2f924e986ac86fdf7b36c94bcdf32beec15 && msgpass || msgfail
+    testsuccess --nomsg apthelper download-file http://localhost:8080/foo foo1 SHA1:f1d2d2f924e986ac86fdf7b36c94bcdf32beec15
     testfileequal foo1 'foo'
 
     msgtest 'apt-file download-file sha256'
-    apthelper -qq download-file http://localhost:8080/foo foo3 SHA256:b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c && msgpass || msgfail
+    testsuccess --nomsg apthelper download-file http://localhost:8080/foo foo3 SHA256:b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c
     testfileequal foo3 'foo'
 
     msgtest 'apt-file download-file no-hash'
-    apthelper -qq download-file http://localhost:8080/foo foo4 && msgpass || msgfail
+    testsuccess --nomsg apthelper download-file http://localhost:8080/foo foo4
     testfileequal foo4 'foo'
     
     msgtest 'apt-file download-file wrong hash'
-    if ! apthelper -qq download-file http://localhost:8080/foo foo5 MD5Sum:aabbcc 2>&1 2> download.stderr; then
-        msgpass
-    else
-        msgfail
-    fi
-    testfileequal download.stderr 'E: Failed to fetch http://localhost:8080/foo  Hash Sum mismatch
+    testfailure --nomsg apthelper -qq download-file http://localhost:8080/foo foo5 MD5Sum:aabbcc
+    testfileequal rootdir/tmp/testfailure.output 'E: Failed to fetch http://localhost:8080/foo  Hash Sum mismatch
 
 E: Download Failed'
     testfileequal foo5.FAILED 'foo'
+
+    msgtest 'apt-file download-file md5sum sha1'
+    testsuccess --nomsg apthelper download-file http://localhost:8080/foo foo6 MD5Sum:d3b07384d113edec49eaa6238ad5ff00 http://localhost:8080/foo2 foo7 SHA1:e242ed3bffccdf271b7fbaf34ed72d089537b42f
+    testfileequal foo6 'foo'
+    testfileequal foo7 'bar'
 }
 
 test_apt_helper_detect_proxy() {
diff --git a/test/integration/test-partial-file-support b/test/integration/test-partial-file-support
index 5ab326def..160d451b6 100755
--- a/test/integration/test-partial-file-support
+++ b/test/integration/test-partial-file-support
@@ -24,13 +24,25 @@ testdownloadfile() {
 	else
 		msgpass
 	fi
-	cat "$DOWNLOADLOG" | while read field hash; do
+	sed -e '/^ <- / s#%20# #g' -e '/^ <- / s#%0a#\n#g' "$DOWNLOADLOG" | grep '^.*-Hash: ' > receivedhashes.log
+	testsuccess test -s receivedhashes.log
+	local HASHES_OK=0
+	local HASHES_BAD=0
+	while read field hash; do
 		local EXPECTED
 		case "$field" in
 		'MD5Sum-Hash:') EXPECTED="$(md5sum "$TESTFILE" | cut -d' ' -f 1)";;
 		'SHA1-Hash:') EXPECTED="$(sha1sum "$TESTFILE" | cut -d' ' -f 1)";;
 		'SHA256-Hash:') EXPECTED="$(sha256sum "$TESTFILE" | cut -d' ' -f 1)";;
 		'SHA512-Hash:') EXPECTED="$(sha512sum "$TESTFILE" | cut -d' ' -f 1)";;
+		'Checksum-FileSize-Hash:')
+			#filesize is too weak to check for !=
+			if [ "$4" = '=' ]; then
+				EXPECTED="$(stat -c '%s' "$TESTFILE")"
+			else
+				continue
+			fi
+			;;
 		*) continue;;
 		esac
 		if [ "$4" = '=' ]; then
@@ -40,15 +52,41 @@ testdownloadfile() {
 		fi
 		if [ "$EXPECTED" "$4" "$hash" ]; then
 			msgpass
+			HASHES_OK=$((HASHES_OK+1));
 		else
-			cat >&2 "$DOWNLOADLOG"
 			msgfail "expected: $EXPECTED ; got: $hash"
+			HASHES_BAD=$((HASHES_BAD+1));
 		fi
-	done
+	done < receivedhashes.log
+	msgtest 'At least one good hash and no bad ones'
+	if [ $HASHES_OK -eq 0 ] || [ $HASHES_BAD -ne 0 ]; then
+		cat >&2 "$DOWNLOADLOG"
+		msgfail
+	else
+		msgpass
+	fi
 }
 
 TESTFILE='aptarchive/testfile'
 cp -a ${TESTDIR}/framework $TESTFILE
+cp -a ${TESTDIR}/framework "${TESTFILE}2"
+
+followuprequest() {
+	local DOWN='./testfile'
+
+	copysource $TESTFILE 1M $DOWN
+	testdownloadfile 'completely downloaded file' "${1}/testfile" "$DOWN" '='
+	testwebserverlaststatuscode '416' "$DOWNLOADLOG"
+
+	copysource $TESTFILE 1M $DOWN
+	copysource "${TESTFILE}2" 20 "${DOWN}2"
+	msgtest 'Testing download of files with' 'completely downloaded file + partial file'
+	testsuccess --nomsg apthelper -o Debug::Acquire::${1%%:*}=1 -o Debug::pkgAcquire::Worker=1 \
+		download-file "$1/testfile" "$DOWN" '' "$1/testfile2" "${DOWN}2"
+	testwebserverlaststatuscode '206' 'rootdir/tmp/testsuccess.output'
+	testsuccess diff -u "$TESTFILE" "${DOWN}"
+	testsuccess diff -u "${DOWN}" "${DOWN}2"
+}
 
 testrun() {
 	webserverconfig 'aptwebserver::support::range' 'true'
@@ -65,9 +103,11 @@ testrun() {
 	testdownloadfile 'invalid partial data' "${1}/testfile" './testfile' '!='
 	testwebserverlaststatuscode '206' "$DOWNLOADLOG"
 
-	copysource $TESTFILE 1M ./testfile
-	testdownloadfile 'completely downloaded file' "${1}/testfile" './testfile' '='
-	testwebserverlaststatuscode '416' "$DOWNLOADLOG"
+	webserverconfig 'aptwebserver::closeOnError' 'false'
+	followuprequest "$1"
+	webserverconfig 'aptwebserver::closeOnError' 'true'
+	followuprequest "$1"
+	webserverconfig 'aptwebserver::closeOnError' 'false'
 
 	copysource /dev/zero 1M ./testfile
 	testdownloadfile 'too-big partial file' "${1}/testfile" './testfile' '='
@@ -85,8 +125,18 @@ testrun() {
 	testwebserverlaststatuscode '200' "$DOWNLOADLOG"
 }
 
+msgmsg 'http: Test with Content-Length'
+webserverconfig 'aptwebserver::chunked-transfer-encoding' 'false'
+testrun 'http://localhost:8080'
+msgmsg 'http: Test with Transfer-Encoding: chunked'
+webserverconfig 'aptwebserver::chunked-transfer-encoding' 'true'
 testrun 'http://localhost:8080'
 
 changetohttpswebserver
 
+msgmsg 'https: Test with Content-Length'
+webserverconfig 'aptwebserver::chunked-transfer-encoding' 'false'
+testrun 'https://localhost:4433'
+msgmsg 'https: Test with Transfer-Encoding: chunked'
+webserverconfig 'aptwebserver::chunked-transfer-encoding' 'true'
 testrun 'https://localhost:4433'