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DEV: h2: add the ability to emit literals in mkhdr

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It's sometimes needed to be able to build a headers frame, let's
add this by permitting to encode key/value pairs as literal headers.
This commit is contained in:
Willy Tarreau 2023-10-10 16:42:39 +02:00
parent e19334a343
commit 57b6c17099
1 changed files with 29 additions and 2 deletions
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31
dev/h2/mkhdr.sh
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@ -4,9 +4,12 @@
# All fields are optional. 0 assumed when absent. # All fields are optional. 0 assumed when absent.
USAGE=\ USAGE=\
"Usage: %s [-l <len> ] [-t <type>] [-f <flags>] [-i <sid>] [ -d <data> ] > hdr.bin "Usage: %s [-l <len> ] [-t <type>] [-f <flags>] [-i <sid>] [ -d <data> ]
[ -e <name> <value> ]* [ -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. 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
in literal.
Supported symbolic types (case insensitive prefix match): Supported symbolic types (case insensitive prefix match):
DATA (0x00) PUSH_PROMISE (0x05) DATA (0x00) PUSH_PROMISE (0x05)
@ -25,6 +28,7 @@ LEN=
TYPE= TYPE=
FLAGS= FLAGS=
ID= ID=
HDR=( )
die() { die() {
[ "$#" -eq 0 ] || echo "$*" >&2 [ "$#" -eq 0 ] || echo "$*" >&2
@ -110,6 +114,7 @@ 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="$2" ; shift 2 ;;
-e) TYPE=1; HDR[${#HDR[@]}]="$2=$3"; shift 3 ;;
-h|--help) usage "${0##*}"; quit;; -h|--help) usage "${0##*}"; quit;;
*) usage "${0##*}"; die ;; *) usage "${0##*}"; die ;;
esac esac
@ -136,7 +141,29 @@ if [ -n "${ID##[0-9]*}" ]; then
fi fi
if [ -z "$DATA" ]; then if [ -z "$DATA" ]; then
HEX=""
# If we're trying to emit literal headers, let's pre-build the raw data
# and measure their total length.
if [ ${#HDR[@]} -gt 0 ]; then
# limited to 127 bytes for name and value
for h in "${HDR[@]}"; do
n=${h%%=*}
v=${h#*=}
nl=${#n}
vl=${#v}
nl7=$(printf "%02x" $((nl & 127)))
vl7=$(printf "%02x" $((vl & 127)))
HEX="${HEX}\x40\x${nl7}${n}\x${vl7}${v}"
done
LEN=$(printf "${HEX}" | wc -c)
fi
mkframe "$LEN" "$TYPE" "$FLAGS" "$ID" mkframe "$LEN" "$TYPE" "$FLAGS" "$ID"
# now emit the literal data of advertised length
if [ -n "$HEX" ]; then
printf "${HEX}"
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
# advertising their respective lengths. # advertising their respective lengths.