Masscan FIX ERROR: bad packet template
Issue
Using masscan through a OpenVPN interface raises an error.
u505@naos:~$ sudo masscan -e tun0 -p1-65535,U:1-65535 --rate 1000 10.10.10.84
[sudo] password for u505:
ERROR: bad packet template
The issue seems to affect Kali distro.
u505@naos:/opt/utils$ sudo masscan --version
Masscan version 1.3.0 ( https://github.com/robertdavidgraham/masscan ) Compiled on: Jan 18 2021 13:14:36 Compiler: gcc 10.2.1 20210110 OS: Linux CPU: unknown (64 bits) GIT version: unknown
Fix
We download the source and copy the patch written by sCRiPTz-TEAM
u505@naos:/opt/utils$ git clone https://github.com/robertdavidgraham/masscan.git Cloning into 'masscan'... remote: Enumerating objects: 41, done. remote: Counting objects: 100% (41/41), done. remote: Compressing objects: 100% (34/34), done. remote: Total 5022 (delta 16), reused 24 (delta 7), pack-reused 4981 Receiving objects: 100% (5022/5022), 3.19 MiB | 6.21 MiB/s, done. Resolving deltas: 100% (3491/3491), done.
In the src folder we copy the patched version of templ-pkt.c.
u505@naos:/opt/utils$ cd masscan/ u505@naos:/opt/utils/masscan$ cd src/ u505@naos:/opt/utils/masscan/src$ wget https://raw.githubusercontent.com/scriptzteam/masscan-openVPN/main/src/templ-pkt.c --2021-01-29 10:19:58-- https://raw.githubusercontent.com/scriptzteam/masscan-openVPN/main/src/templ-pkt.c Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 199.232.0.133 Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|199.232.0.133|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 57413 (56K) [text/plain] Saving to: ‘templ-pkt.c.1’
templ-pkt.c.1 100%[===================>] 56.07K --.-KB/s in 0.01s
2021-01-29 10:19:58 (5.55 MB/s) - ‘templ-pkt.c.1’ saved [57413/57413]
The new version of templ-pkt.c ignores the error.
u505@naos:/opt/utils/masscan/src$ mv templ-pkt.c templ-pkt.c.org u505@naos:/opt/utils/masscan/src$ mv templ-pkt.c.1 templ-pkt.c u505@naos:/opt/utils/masscan/src$ diff templ-pkt.c templ-pkt.c.org 1121,1122c1121,1122 < //LOG(0, "ERROR: bad packet template\n"); < //exit(1); --- > LOG(0, "ERROR: bad packet template\n"); > exit(1); 1185,1186c1185,1186 < //LOG(0, "ERROR: bad packet template\n"); < //exit(1); --- > LOG(0, "ERROR: bad packet template\n"); > exit(1); 1232,1233c1232,1233 < //LOG(0, "ERROR: bad packet template\n"); < //exit(1); --- > LOG(0, "ERROR: bad packet template\n"); > exit(1); 1508a1509 >
Compile and install
u505@naos:/opt/utils/masscan/src$ cd .. u505@naos:/opt/utils/masscan$ make ... u505@naos:/opt/utils/masscan$ sudo make install install -pDm755 bin/masscan /usr/bin/masscan
u505@naos:~$ masscan --version
Masscan version 1.3.1 ( https://github.com/robertdavidgraham/masscan ) Compiled on: Jan 29 2021 10:18:54 Compiler: gcc Debian Clang 11.0.1 OS: Linux CPU: unknown (64 bits) GIT version: 1.3.1-2-g4407812
