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Added option app_dns

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AGG2017 2024-02-17 21:01:24 -05:00
parent 2fa48971f0
commit 90aeec2af0
2 changed files with 57 additions and 0 deletions
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49
RESOURCES/OPTIONS/app_dns/app_dns.sh Executable file
View file

@ -0,0 +1,49 @@
#!/bin/bash
# global definitions:
RED='\033[0;31m'
NC='\033[0m'
# check the parameters
if [ $# != 2 ]; then
echo "usage : $0 <project_root> <dns_replacement>"
exit 1
fi
project_root="$1"
dns_replacement="$2"
# check the project root folder
if [ ! -d "$project_root" ]; then
echo -e "${RED}ERROR: Cannot find the folder '$project_root' ${NC}"
exit 2
fi
# check the target file
def_target="$project_root/unpacked/squashfs-root/app/app"
if [ ! -f "$def_target" ]; then
echo -e "${RED}ERROR: Cannot find the target file '$def_target' ${NC}"
exit 3
fi
# patch the app
old_dns=$(echo -n "$dns_replacement" | cut -d "|" -f 1)
new_dns=$(echo -n "$dns_replacement" | cut -d "|" -f 2)
if [ -z "$old_dns" ] || [ -z "$new_dns" ]; then
echo -e "${RED}ERROR: The requested DNS replacement is not valid: '$dns_replacement' ${NC}"
exit 4
fi
dns_url="udp://$old_dns:53"
# find all records with offsets that match the requested old DNS
results=$(grep --binary-files=text -b -o "$dns_url" "$def_target" | xargs echo -n)
if [ -z "$results" ]; then
echo -e "${RED}ERROR: The 'app' might be already patched. Cannot find the expected DNS '$dns_url' ${NC}"
exit 5
fi
# replace all found old DNS with the new one
for result in $results; do
offset=$(echo -n "$result" | awk -F: '{print $1}')
printf "udp://%s:53\x00" "$new_dns" | dd of="$def_target" bs=1 seek="$offset" conv=notrunc &>>/dev/null
done
exit 0

8
options.cfg
View file

@ -66,6 +66,14 @@ kobra_unleashed="localhost.mr-a.de"
# Available settings are: 5s, 10s, 20s, 30s and 60s
app_net_ready="30s"
# Modify the hardcoded app DNS
# For parameter(s) provide "old_dns|new_dns"
# Available hardcoded DNS in the app:
# "8.8.8.8", "208.67.222.222", "114.114.114.114", "223.5.5.5"
# You can replace one, more or all of them
# Example: app_dns="208.67.222.222|4.4.4.4" "223.5.5.5|8.8.4.4"
#app_dns="223.5.5.5|8.8.4.4"
# Replace some of the app images
# Use it for one or more sets: app_images="set1" "set2" "set3"
#app_images="set1"