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DEV: h2: support passing raw data for a frame

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With -r it's possible to pass raw data that will be interpreted by
printf so it even supports \x sequences. E.g. for a RST_STREAM, let's
just use \x00\x00\x00\x00.
This commit is contained in:
Willy Tarreau 2023-10-10 17:09:38 +02:00
parent ec8ea73bc0
commit 57f8a4e879
1 changed files with 12 additions and 7 deletions
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19
dev/h2/mkhdr.sh
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@ -5,11 +5,11 @@
USAGE=\ USAGE=\
"Usage: %s [-l <len> ] [-t <type>] [-f <flags>] [-i <sid>] [ -d <data> ] "Usage: %s [-l <len> ] [-t <type>] [-f <flags>] [-i <sid>] [ -d <data> ]
[ -e <name> <value> ]* [ -h | --help ] > hdr.bin [ -e <name> <value> ]* [ -r raw ] [ -h | --help ] > hdr.bin
Numbers are decimal or 0xhex. Not set=0. If <data> is passed, it points Numbers are decimal or 0xhex. Not set=0. If <data> is passed, it points
to a file that is read and chunked into frames of <len> bytes. -e to a file that is read and chunked into frames of <len> bytes. -e
encodes a headers frame (by default) with all headers at once encoded encodes a headers frame (by default) with all headers at once encoded
in literal. Use type 'p' for the preface. in literal. Use type 'p' for the preface. Use -r to pass raw hex data.
Supported symbolic types (case insensitive prefix match): Supported symbolic types (case insensitive prefix match):
DATA (0x00) PUSH_PROMISE (0x05) DATA (0x00) PUSH_PROMISE (0x05)
@ -28,6 +28,7 @@ LEN=
TYPE= TYPE=
FLAGS= FLAGS=
ID= ID=
RAW=
HDR=( ) HDR=( )
die() { die() {
@ -114,6 +115,7 @@ while [ -n "$1" -a -z "${1##-*}" ]; do
-f) FLAGS="$2" ; shift 2 ;; -f) FLAGS="$2" ; shift 2 ;;
-i) ID="$2" ; shift 2 ;; -i) ID="$2" ; shift 2 ;;
-d) DATA="$2" ; shift 2 ;; -d) DATA="$2" ; shift 2 ;;
-r) RAW="$2" ; shift 2 ;;
-e) TYPE=1; HDR[${#HDR[@]}]="$2=$3"; shift 3 ;; -e) TYPE=1; HDR[${#HDR[@]}]="$2=$3"; shift 3 ;;
-h|--help) usage "${0##*}"; quit;; -h|--help) usage "${0##*}"; quit;;
*) usage "${0##*}"; die ;; *) usage "${0##*}"; die ;;
@ -143,7 +145,6 @@ fi
if [ "$TYPE" = "p" ]; then if [ "$TYPE" = "p" ]; then
printf "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" printf "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n"
elif [ -z "$DATA" ]; then elif [ -z "$DATA" ]; then
HEX=""
# If we're trying to emit literal headers, let's pre-build the raw data # If we're trying to emit literal headers, let's pre-build the raw data
# and measure their total length. # and measure their total length.
if [ ${#HDR[@]} -gt 0 ]; then if [ ${#HDR[@]} -gt 0 ]; then
@ -155,16 +156,20 @@ elif [ -z "$DATA" ]; then
vl=${#v} vl=${#v}
nl7=$(printf "%02x" $((nl & 127))) nl7=$(printf "%02x" $((nl & 127)))
vl7=$(printf "%02x" $((vl & 127))) vl7=$(printf "%02x" $((vl & 127)))
HEX="${HEX}\x40\x${nl7}${n}\x${vl7}${v}" RAW="${RAW}\x40\x${nl7}${n}\x${vl7}${v}"
done done
LEN=$(printf "${HEX}" | wc -c) fi
# compute length if RAW set
if [ -n "$RAW" ]; then
LEN=$(printf "${RAW}" | wc -c)
fi fi
mkframe "$LEN" "$TYPE" "$FLAGS" "$ID" mkframe "$LEN" "$TYPE" "$FLAGS" "$ID"
# now emit the literal data of advertised length # now emit the literal data of advertised length
if [ -n "$HEX" ]; then if [ -n "$RAW" ]; then
printf "${HEX}" printf "${RAW}"
fi fi
else else
# read file $DATA in <LEN> chunks and send it in multiple frames # read file $DATA in <LEN> chunks and send it in multiple frames