From f6aee41fb1bdb0c713979d632bbce1db5c7878fc Mon Sep 17 00:00:00 2001
From: Oliver Smith <osmith@sysmocom.de>
Date: Fri, 15 Oct 2021 17:01:07 +0200
Subject: [PATCH] send-at-retry: add script

---
 src/send-at-retry/README.md                   |  7 +++
 src/send-at-retry/data/lxc_attach.sh          |  7 +++
 .../data/send_at_retry_android.sh             | 47 +++++++++++++++++++
 src/send-at-retry/data/send_at_retry_ut.sh    | 12 +++++
 src/send-at-retry/send_at_retry.sh            | 18 +++++++
 5 files changed, 91 insertions(+)
 create mode 100644 src/send-at-retry/README.md
 create mode 100644 src/send-at-retry/data/lxc_attach.sh
 create mode 100644 src/send-at-retry/data/send_at_retry_android.sh
 create mode 100644 src/send-at-retry/data/send_at_retry_ut.sh
 create mode 100755 src/send-at-retry/send_at_retry.sh

diff --git a/src/send-at-retry/README.md b/src/send-at-retry/README.md
new file mode 100644
index 0000000..8add0d5
--- /dev/null
+++ b/src/send-at-retry/README.md
@@ -0,0 +1,7 @@
+Send AT commands multiple times until an expected string is in the reply.
+
+This hack is a PoC for sending AT commands through the same pseudo TTY that
+mtkfusionrild is using.
+
+Preparation:
+- Ubuntu touch with ssh enabled and writable rootfs
diff --git a/src/send-at-retry/data/lxc_attach.sh b/src/send-at-retry/data/lxc_attach.sh
new file mode 100644
index 0000000..3d3268e
--- /dev/null
+++ b/src/send-at-retry/data/lxc_attach.sh
@@ -0,0 +1,7 @@
+#!/bin/sh -ex
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Author: Oliver Smith
+# Copyright 2021 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+# Related: https://github.com/ubports/ubuntu-touch/issues/1836
+
+LD_PRELOAD= LD_LIBRARY_PATH= lxc-attach -n android -e -- "$@"
diff --git a/src/send-at-retry/data/send_at_retry_android.sh b/src/send-at-retry/data/send_at_retry_android.sh
new file mode 100644
index 0000000..0cff18d
--- /dev/null
+++ b/src/send-at-retry/data/send_at_retry_android.sh
@@ -0,0 +1,47 @@
+#!/bin/sh -e
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Author: Oliver Smith
+# Copyright 2021 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+
+DEV="/dev/radio/ptty2cmd2"
+RET="/data/local/tmp/ims_apn"
+
+# $1: AT command to send
+# $2: retry until finding this string in reply
+send() {
+	echo "---"
+	echo "> $1"
+
+	rm -rf "$RET"
+	cat "$DEV" > "$RET" &
+	pid="$!"
+
+	for i in $(seq 1 5); do
+		printf .
+		echo "$1" > "$DEV"
+		sleep 0.1
+
+		if grep -q "$2" "$RET"; then
+			cat "$RET"
+			kill "$pid"
+			return
+		fi
+	done
+
+	kill "$pid"
+	echo
+	echo "ERROR: could not find '$2' in response:"
+	cat "$RET"
+	exit 1
+}
+
+# Query firmware information
+send 'AT+CGMI' '+CGMI:'
+send 'AT+CGMM' '+CGMM:'
+send 'AT+CGMR' '+CGMR:'
+
+# Add your at commands below
+
+echo
+echo "---"
+echo "done"
diff --git a/src/send-at-retry/data/send_at_retry_ut.sh b/src/send-at-retry/data/send_at_retry_ut.sh
new file mode 100644
index 0000000..31590b2
--- /dev/null
+++ b/src/send-at-retry/data/send_at_retry_ut.sh
@@ -0,0 +1,12 @@
+#!/bin/sh -ex
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Author: Oliver Smith
+# Copyright 2021 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+set -x
+dump_name="$1"
+
+chmod +x /mnt/tmp/android_run.sh
+chmod +x /tmp/lxc_attach.sh
+
+sudo /tmp/lxc_attach.sh /mnt/tmp/android_run.sh "$1" 2>&1 \
+	| tee /tmp/"$dump_name"
diff --git a/src/send-at-retry/send_at_retry.sh b/src/send-at-retry/send_at_retry.sh
new file mode 100755
index 0000000..e9cfa47
--- /dev/null
+++ b/src/send-at-retry/send_at_retry.sh
@@ -0,0 +1,18 @@
+#!/bin/sh -ex
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Author: Oliver Smith
+# Copyright 2021 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+dump_name="$(date "+%Y-%m-%d_%H%M%S")"
+
+adb push data/send_at_retry_ut.sh /tmp/run.sh
+adb push data/lxc_attach.sh /tmp/lxc_attach.sh
+adb push data/send_at_retry_android.sh /mnt/tmp/android_run.sh
+
+adb forward tcp:8023 tcp:22
+ssh -t -p 8023 phablet@localhost \
+	sh -e /tmp/run.sh "$dump_name"
+
+mkdir -p dump/"${dump_name}_at"
+adb pull /tmp/"$dump_name" "dump/${dump_name}_at/${dump_name}.txt"
+
+ln -sf "$PWD/dump/${dump_name}_at/${dump_name}.txt" /tmp/latest.txt