From e4804115e2e17bfa958da81678ae2baf0457f3b5 Mon Sep 17 00:00:00 2001
From: ghe0 <gheorghe@gheo.tech>
Date: Sun, 8 Dec 2024 00:50:54 +0200
Subject: [PATCH] allow multiple nics to be configured via cmdline

---
 scripts/init_functions.sh | 45 ++++++++++++++++++++++++++++-----------
 1 file changed, 32 insertions(+), 13 deletions(-)

diff --git a/scripts/init_functions.sh b/scripts/init_functions.sh
index 79ab032..586685d 100644
--- a/scripts/init_functions.sh
+++ b/scripts/init_functions.sh
@@ -39,27 +39,46 @@ create_certs() {
     -days 365 -subj "$subject" 2>/dev/null
 }
 
-# expects kernel param in this format: detee_net=192.168.122.140_24_192.168.122.1_1.1.1.1
-setup_network() {
-  local settings='' ip_addr='' mask='' cidr='' gateway='' nameserver=''
-  settings=$(cat /proc/cmdline | grep -oE 'detee_net=[0-9a-z\_\:\.]+' | cut -d '=' -f2)
-  # TODO: replace with exit 0 when you are ready to force a kernel panic
+setup_network_device() {
+  local device="$1" settings="$2" ip_addr='' mask='' cidr='' gateway=''
   [[ -z "$settings" ]] && return 0
-  settings="${settings#detee_net=}"
-  ip_addr="$( echo ${settings} | cut -d'_' -f1 )"
-  mask="$( echo ${settings} | cut -d'_' -f2 )"
+  ip_addr="$( echo ${settings} | cut -d '_' -f1 )"
+  mask="$( echo ${settings} | cut -d '_' -f2 )"
   cidr="${ip_addr}/${mask}"
-  gateway="$( echo ${settings} | cut -d'_' -f3 )"
-  nameserver="$( echo ${settings} | cut -d'_' -f4 )"
+  gateway="$( echo ${settings} | cut -d '_' -f3 )"
 
-  ip addr add $cidr dev eth0
-  ip link set eth0 up
+  ip addr add $cidr dev $device
+  ip link set $device up
   ip route add default via $gateway
-  echo nameserver $nameserver > /etc/resolv.conf
   sleep 2
   ping -c 2 $gateway
 }
 
+# Expects kernel param in this format: detee_net=192.168.122.140_24_192.168.122.1_1.1.1.1
+# In case the interface name is not specified, it defaults to eth0
+# Supports manual device, for example: detee_net_eth1
+# TODO: test if it is required to specify mac instead of device name
+setup_network() {
+  local device_eth0_cfg='' device_cfg='' device_configs=''
+
+  # handle the default: detee_net=...
+  device_eth0_cfg=$(cat /proc/cmdline | grep -oE "detee_net=[0-9a-f\_\:\.]+" | cut -d '=' -f2)
+  [[ -z "$device_eth0_cfg" ]] || setup_network_device eth0 $device_eth0_cfg
+
+  # handle extra devices: detee_net_eth1=...
+  device_configs=$(cat /proc/cmdline| grep -oE "detee_net_[a-z0-9]*=[0-9a-f\_\:\.]+")
+  while read -r device_cfg; do
+    setup_network_device \
+      $(echo $device_cfg | cut -d '=' -f1 | cut -d '_' -f3) \
+      $(echo $device_cfg | cut -d '=' -f2)
+  done <<< "$( echo "$device_configs" )"
+
+  echo nameserver 1.1.1.1 >> /etc/resolv.conf
+  echo nameserver 1.0.0.1 >> /etc/resolv.conf
+  echo nameserver 2606:4700:4700::1111 >> /etc/resolv.conf
+  echo nameserver 2606:4700:4700::1001 >> /etc/resolv.conf
+}
+
 
 # detee_ghu stands for GitHub user and expects format detee_ghu=ghe0
 github_ssh_key() {