Ahoy friends.
Currently i got a bash script running to manage my minecraft servers.
All of them are stored in /home/minecraft_servers directory.
Using my script im able to start a server (e.g. ./minecraft start ftb_continuum) because server name and server name are the same.(e.g. /home/minecraft_servers/ftb_continuum)
Because of security and efficiency reasons i want to get this script working in C but unfortunately i dont know how to begin, even using my rusty knowledge of my study.
Does someone have any advice how to begin?
Thats my bash script:
#!/bin/bash
# /etc/init.d/minecraft
# version 0.4.2 2016-02-09 (YYYY-MM-DD)
#
### BEGIN INIT INFO
# Provides: minecraft
# Required-Start: $local_fs $remote_fs screen-cleanup
# Required-Stop: $local_fs $remote_fs
# Should-Start: $network
# Should-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Minecraft server
# Description: Starts the minecraft server
### END INIT INFO
#Settings
SERVICE="${2}.jar"
SCREENNAME=$2
OPTIONS='nogui'
USERNAME='root'
WORLD='world'
MCPATH="/home/minecraft_servers/${2}/"
MINHEAP=4096
HISTORY=4096
CPU_COUNT=16
Xms=1G
JAVACMD="java"
MAX_RAM="8192M" # -Xmx
JAVA_PARAMETERS="-XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=${CPU_COUNT} -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -XX:+AggressiveOpts -Xms${Xms}"
INVOCATION="${JAVACMD} -server -Xmx${MAX_RAM} ${JAVA_PARAMETERS} -jar ${SERVICE} nogui"
Backuppath="/var/www/backup_folder/Minecraft/modded/"
Zielordner="${Backuppath}Minecraft_Modded_Backup_${SERVICE}_$(date +%Y-%m-%d_%H-%M).7z"
Password="FASkog4AmtO1XIvGbkh8sqppYs51Eo7E7drbVpCSXOIsX4yyaUsIXvVEnLGQELMh3n1eqI23QiOGVhnsnlCX7GGMQKVapKCfoqnei2u8Ssb7ZDgbbbfYgpoo0DT"
ME=`whoami`
as_user() {
if [ "$ME" = "$USERNAME" ] ; then
bash -c "$1"
else
su - "$USERNAME" -c "$1"
fi
}
mc_start() {
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "$SERVICE is already running!"
else
echo "Starting $SERVICE..."
cd $MCPATH
as_user "cd $MCPATH && screen -h $HISTORY -dmS ${SCREENNAME} $INVOCATION"
sleep 7
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "$SERVICE is now running."
else
echo "Error! Could not start $SERVICE!"
fi
fi
}
mc_saveoff() {
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "$SERVICE is running... suspending saves"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"say SERVER BACKUP STARTING. Server going readonly...\"\015'"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"save-off\"\015'"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"save-all\"\015'"
sync
sleep 10
else
echo "$SERVICE is not running. Not suspending saves."
fi
}
mc_port(){
grep -n 'server-port=' "$MCPATH/server.properties"
}
mc_saveon() {
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "$SERVICE is running... re-enabling saves"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"save-on\"\015'"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"say SERVER BACKUP ENDED. Server going read-write...\"\015'"
else
echo "$SERVICE is not running. Not resuming saves."
fi
}
mc_stop() {
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "Stopping $SERVICE"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"say SERVER SHUTTING DOWN IN 10 SECONDS. Saving map...\"\015'"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"save-all\"\015'"
sleep 10
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"stop\"\015'"
sleep 7
else
echo "$SERVICE was not running."
fi
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "Error! $SERVICE could not be stopped."
else
echo "$SERVICE is stopped."
fi
}
mc_update() {
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "$SERVICE is running! Will not start update."
else
as_user "cd $MCPATH && wget -q -O $MCPATH/versions --no-check-certificate https://launchermeta.mojang.com/mc/game/version_manifest.json"
if [ "$1" == "snapshot" ] ; then
JSONVERSION=`cd $MCPATH && cat versions | python -c "exec(\"import json,sys\nobj=json.load(sys.stdin)\nversion=obj['latest']['snapshot']\nfor v in obj['versions']:\n if v['id']==version:\n print(v['url'])\")"`
else
JSONVERSION=`cd $MCPATH && cat versions | python -c "exec(\"import json,sys\nobj=json.load(sys.stdin)\nversion=obj['latest']['release']\nfor v in obj['versions']:\n if v['id']==version:\n print(v['url'])\")"`
fi
as_user "cd $MCPATH && wget -q -O $MCPATH/versions --no-check-certificate $JSONVERSION"
MC_SERVER_URL=`cd $MCPATH && cat versions | python -c 'import json,sys;obj=json.load(sys.stdin);print(obj["downloads"]["server"]["url"])'`
as_user "rm $MCPATH/versions"
as_user "cd $MCPATH && wget -q -O $MCPATH/minecraft_server.jar.update --no-check-certificate $MC_SERVER_URL"
if [ -f $MCPATH/minecraft_server.jar.update ] ; then
if `diff $MCPATH/$SERVICE $MCPATH/minecraft_server.jar.update >/dev/null` ; then
echo "You are already running the latest version of $SERVICE."
else
as_user "mv $MCPATH/minecraft_server.jar.update $MCPATH/$SERVICE"
echo "Minecraft successfully updated."
fi
else
echo "Minecraft update could not be downloaded."
fi
fi
}
mc_backup() {
mc_saveoff
if [ ! -d "${MCPATH}" ]; then
echo "MCPATH existiert nicht!"
exit 1
fi
if [ -d "${Zielordner}" ]; then
echo "Zielordner bereits vorhanden!"
exit 1
fi
7z a -t7z -mx=0 -m0=LZMA2 -mmt=${CPU_COUNT} -p"${Password}" "${Zielordner}" "${MCPATH}" >> "${Backuppath}placeholder.txt"
7z h -scrcsha256 "${Zielordner}" >> "${Backuppath}placeholder.txt"
mc_saveon
}
mc_command() {
command="$1";
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
pre_log_len=`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`
echo "$SERVICE is running... executing command"
as_user "screen -p 0 -S ${SCREENNAME} -X eval 'stuff \"$command\"\015'"
sleep .1 # assumes that the command will run and print to the log file in less than .1 seconds
# print output
tail -n $[`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`-$pre_log_len] "$MCPATH/logs/latest.log"
fi
}
#Start-Stop here
case "$1" in
start)
mc_start
;;
stop)
mc_stop
;;
restart)
mc_stop
mc_start
;;
update)
mc_stop
mc_backup
mc_update $2
mc_start
;;
backup)
mc_backup
;;
port)
mc_port
;;
status)
if pgrep -u $USERNAME -f $SERVICE > /dev/null ; then
echo "$SERVICE is running."
else
echo "$SERVICE is not running."
fi
;;
command)
if [ $# -gt 1 ] ; then
shift
mc_command "$*"
else
echo "Must specify server command (try 'help'?)"
fi
;;
*)
echo "Usage: $0 {start|stop|update|backup|status|restart|command|port \"server command\"}"
exit 1
;;
esac
exit 0
I started to create something this way, but now i dont know how to continue.
I have to use bash commands to start the servers, like java -jar (servername) so i have to use system() command.
But i also have to know if the service is already running.
Thats what i have done, but its not working yet.
#include <stdio.h>
#define BUFSIZE 128
const char $USERNAME[]="root";
const char *identifier[5]={"ftb_continuum","ftb_continuum_last","lost+souls","final+frontier","sky_adventure"};
char OPTIONS[]="nogui";
char JAVA_PARAM[]="-XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=${CPU_COUNT} -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -XX:+AggressiveOpts -Xms${Xms}";
char INVOCATION[]="java -jar -server -Xmx4096 ${JAVA_PARAM} -jar ${SERVICE} nogui";
char Backuppath[]="/var/www/repo.openknogle.eu/Minecraft/modded/";
char Password[]="FASkog4AmtO1XIvGbkh8sqppYs51Eo7E7drbVpCSXOIsX4yyaUsIXvVEnLGQELMh3n1eqI23QiOGVhnsnlCX7GGMQKVapKCfoqnei2u8Ssb7ZDgbbbfYgpoo0DT";
int HISTORY = 4096;
const char as_user[]="su - $USERNAME -c argv[1] ";
int send_get_bash(const char *cmd);
int start(const char *server);
}
int main( int argc, char *argv[] ) {
if( argc == 2 ) //Valid options entered
{
if(argv[1] == "start")
{
if(argv[2] == "all")
{
for(int t;t<sizeof(identifier))
{
run_server(identifier[t]);
}
}
else
{
run_server(argv[2]);
}
}
if(argv[1] == "stop")
{
if(argv[2] == "all")
{
for(int t;t<sizeof(identifier))
{
stop_server(identifier[t]);
}
}
else
{
stop_server(argv[2]);
}
}
if(argv[1] == "restart")
{
if(argv[2] == "all")
{
for(int t;t<sizeof(identifier))
{
restart_server(identifier[t]);
}
}
else
{
restart_server(argv[2]);
}
}
if(argv[1] == "backup")
{
if(argv[2] == "all")
{
for(int t;t<sizeof(identifier))
{
backup_server(identifier[t]);
}
}
else
{
backup_server(argv[2]);
}
}
}
int restart_server(char *server)
{
stop_server(server);
run_server(server);
}
else if( argc > 2 ) {
printf("Too many arguments supplied.\n");
}
else {
printf("One argument expected.\n");
}
}
int run_server(char *server)
{
char buffer[128];
snprintf(buffer, sizeof buffer, "./start.sh %s %s %s %i",server,JAVA_PARAM,$USERNAME,HISTORY,INVOCATION);
send_get_bash(buffer);
return 1;
}
int send_get_bash(const char *cmd)
{
char buf[BUFSIZE];
FILE *fp;
if ((fp = popen(cmd, "r")) == NULL) {
printf("Error opening pipe!\n");
return -1;
}
while (fgets(buf, BUFSIZE, fp) != NULL) {
printf("%s", buf);
}
if(pclose(fp)) {
printf("Command not found or exited with error status\n");
return -1;
}
return 0;
}
mc_start(const char *server_start)
{
for(new t;t<sizeof(identifier))
{
if(strcmp(server,identifier[k]);
{
goto start;
break;
}
else if k=sizeof(identifier)-1;
{
printf("Invalid Service!");
}
}
}
start:
run_server(server_start);
}
mc_stop(const char *server_stop)
{
for(new t;t<sizeof(identifier))
{
if(strcmp(server,identifier[k]);
{
goto stop;
break;
}
else if k=sizeof(identifier)-1;
{
printf("Invalid Service!");
}
}
}
stop:
stop_server(server_stop);
}
mc_restart(const char *server_restart)
{
for(new t;t<sizeof(identifier))
{
if(strcmp(server,identifier[k]);
{
goto restart;
break;
}
else if k=sizeof(identifier)-1;
{
printf("Invalid Service!");
}
}
}
restart:
restart_server(server_restart);
}
