- Related Questions & Answers
Android Debug Bridge (ADB) Cheat Sheet. Most Complete ADB Cheat Sheet. Android, esture Reference. When Talkback and Explore by Touch are turned on, the following. Gestures can be used to navigate web pages and native applications. Swipe Up then Down Go to previous reading level for text, then. Swipe right to read forward or left. To go back Swipe Right then Left Next page. Swipe Left then Right.
- Selected Reading
Nmap is a free open source tool, employed to discover hosts and services on a computer network by sending packets and analyzing the retrieved responses. Nmap offers some features for probing computer networks, including host discovery and service and operating system detection.
Whether you’re a new or experienced Linux admin, you have a lot to keep track of on a daily basis. I hope that my cheat sheet will help you out! TIP: For best viewing, hover over the sheet below click the ‘Pop-out’. Download (PDF, 964KB). Samsung Galaxy S20: A cheat sheet (TechRepublic download). Operating system: Android 10.0 Ruggedized features: IP68, MIL-STD-810G compliant, 1.5m drop tested. Read this Android 12 cheat sheet to get up to speed on Google's latest OS. We'll update this resource periodically when there is new information about Android 12. SEE: Top Android security tips.
Nmap can provide further information on targets, including reverse DNS names, device types, and MAC addresses.
Host discovery – Identifying hosts on a network. For example, listing the hosts that respond to TCP and/or ICMP requests or have a particular port open.
Port scanning – Enumerating the open ports on target hosts.
OS detection – Determining the operating system and hardware characteristics of network devices.
Version detection – Interrogating network services on remote devices to determine the application name and version number.
Scriptable interaction with the target support using the Nmap Scripting Engine (NSE).
Usage of Nmap
Cisco vpn download. Auditing the security of a device or firewall by identifying the network connections which can be made to, or through it.
Identifying open ports on a target host in preparation for auditing.
Network inventory, network mapping, and maintenance and asset management.
Auditing the security of a network by identifying new servers.
Generating traffic to hosts on a network, response analysis and response time measurement.
Finding and exploiting vulnerabilities in a network.
DNS queries and subdomain search
NMAP Commands Cheatsheet
The following section explains the usage of category-wise NMAP diverse commands with examples as following -
Basic Scanning Commands
| Goal | Command | Example |
|---|---|---|
| Scan a Single Target | nmap [target] | nmap 192.168.0.1 |
| Scan Multiple Targets | nmap [target1, target2, etc | nmap 192.168.0.1 192.168.0.2 |
| Scan a Range of Hosts | nmap [range of ip addresses] | nmap 192.168.0.1-10 |
| Scan an Entire Subnet | nmap [ip address/cdir] | nmap 192.168.0.1/24 |
| Scan Random Hosts | nmap -iR [number] | nmap -iR 0 |
| Excluding Targets from a Scan | nmap [targets] – exclude [targets] | nmap 192.168.0.1/24 –exclude 192.168.0.100, 192.168.0.200 |
| Excluding Targets Using a List | nmap [targets] – excludefile [list.txt] | nmap 192.168.0.1/24 –excludefile notargets.txt |
| Perform an Aggressive Scan | nmap -A [target] | nmap -A 192.168.0.1 |
| Scan an IPv6 Target | nmap -6 [target] | nmap -6 1aff:3c21:47b1:0000:0000:0000:0000:2afe |
Discovery Options
| Goal | Command | Example |
|---|---|---|
| Perform a Ping Only Scan | nmap -sP [target] | nmap -sP 192.168.0.1 |
| Don’t Ping | nmap -PN [target] | nmap -PN 192.168.0.1 |
| TCP SYN Ping | nmap -PS [target] | nmap -PS 192.168.0.1 |
| TCP ACK Ping | nmap -PA [target] | nmap -PA 192.168.0.1 |
| UDP Ping | nmap -PU [target] | nmap -PU 192.168.0.1 |
| SCTP INIT Ping | nmap -PY [target] | nmap -PY 192.168.0.1 |
| ICMP Echo Ping | nmap -PE [target] | nmap -PE 192.168.0.1 |
| ICMP Timestamp Ping | nmap -PP [target] | nmap -PP 192.168.0.1 |
| CMP Address Mask Ping | nmap -PM [target] | nmap -PM 192.168.0.1 |
| IP Protocol Ping | nmap -PO [target] | nmap -PO 192.168.0.1 |
| ARP Ping | nmap -PR [target] | nmap -PR 192.168.0.1 |
|---|---|---|
| Traceroute | nmap –traceroute [target] | nmap –traceroute 192.168.0.1 |
| Force Reverse DNS Resolution | nmap -R [target] | nmap -R 192.168.0.1 |
| Disable Reverse DNS Resolution | nmap -n [target] | nmap -n 192.168.0.1 |
| Alternative DNS Lookup | nmap –system-dns [target] | nmap –system-dns 192.168.0.1 |
| Manually Specify DNS Server(s) | nmap –dns-servers [servers] [target] | nmap –dns-servers 201.56.212.54 192.168.0.1 |
| Create a Host List | nmap -sL [targets] | nmap -sL 192.168.0.1/24 |
Advanced Scanning Options
| Goal | Command | Example |
|---|---|---|
| TCP SYN Scan | nmap -sS [target] | nmap -sS 192.168.0.1 |
| TCP Connect Scan | nmap -sT [target] | nmap -sT 192.168.0.1 |
| UDP Scan | nmap -sU [target] | nmap -sU 192.168.0.1 |
| TCP NULL Scan | nmap -sN [target] | nmap -sN 192.168.0.1 |
| TCP FIN Scan | nmap -sF [target] | nmap -sF 192.168.0.1 |
| Xmas Scan | nmap -sX [target] | nmap -sX 192.168.0.1 |
| TCP ACK Scan | nmap -sA [target] | nmap -sA 192.168.0.1 |
| Custom TCP Scan | nmap –scanflags [flags] [target] | nmap –scanflags SYNFIN 192.168.0.1 |
| IP Protocol Scan | nmap -sO [target] | nmap -sO 192.168.0.1 |
| Send Raw Ethernet Packets | nmap –send-eth [target] | nmap –send-eth 192.168.0.1 |
| Send IP Packets | nmap –send-ip [target] | nmap –send-ip 192.168.0.1 |
Port Scanning Options
| Goal | Command | Example |
|---|---|---|
| Perform a Fast Scan | nmap -F [target] | nmap -F 192.168.0.1 |
| Scan Specific Ports | nmap -p [port(s)] [target] | nmap -p 21-25,80,139,8080 192.168.1.1 |
| Scan Ports by Name | nmap -p [port name(s)] [target] | nmap -p ftp,http* 192.168.0.1 |
| Scan Ports by Protocol | nmap -sU -sT -p U: [ports],T:[ports] [target] | nmap -sU -sT -p U:53,111,137,T:21- 25,80,139,8080 192.168.0.1 |
| Scan All Ports | nmap -p ‘*’ [target] | nmap -p ‘*’ 192.168.0.1 |
| Scan Top Ports | nmap –top-ports [number] [target] | nmap –top-ports 10 192.168.0.1 |
| Perform a Sequential Port Scan | nmap -r [target] | nmap -r 192.168.0.1 |
Version Detection
| Goal | Command | Example |
|---|---|---|
| Operating System Detection | nmap -O [target] | nmap -O 192.168.0.1 |
| Submit TCP/IP Fingerprints | www.nmap.org/submit/ | |
| Fingerprints | ||
| Attempt to Guess an Unknown OS | nmap -O –osscan guess [target] | nmap -O –osscan-guess 192.168.0.1 |
| Service Version Detection | nmap -sV [target] | nmap -sV 192.168.0.1 |
| Troubleshooting Version Scans | nmap -sV –version trace [target] | nmap -sV –version-trace 192.168.0.1 |
| Perform a RPC Scan | nmap -sR [target] | nmap -sR 192.168.0.1 |
Firewall Evasion Techniques
| Goal | Command | Example |
|---|---|---|
| augment Packets | nmap -f [target] | nmap -f 192.168.0.1 |
| pacify a Specific MTU | nmap –mtu [MTU] [target] | nmap –mtu 32 192.168.0. |
| Use a Decoy | nmap -D RND:[number] [target] | nmap -D RND:10 192.168.0.1 |
| le Zombie Scan | nmap -sI [zombie] [target] | nmap -sI 192.168.0.38 |
| Manually Specify a Source Port | nmap –source-port [port] [target] | nmap –source-port 10 192.168.0.1 |
| Append Random Data | nmap –data-length [size] [target] | nmap –data-length 2 192.168.0.1 |
| Randomize Target Scan Order | nmap –randomize-hosts [target] | nmap –randomize-ho 192.168.0.1-20 |
| Spoof MAC Address | nmap –spoof-mac [MAC|0|vendor] [target] | nmap –spoof-mac Cis 192.168.0.1 |
| Send Bad Checksums | nmap –badsum [target] | nmap –badsum 192.168.0.1 |
Troubleshooting And Debugging
| Goal | Command | Example |
|---|---|---|
| Getting Help | nmap -h | nmap -h |
| Display Nmap Version | nmap -V | nmap -V |
| Verbose Output | nmap -v [target] | nmap -v 192.168.0.1 |
| Debugging | nmap -d [target] | nmap -d 192.168.0.1 |
| Display Port State Reason | nmap –reason [target] | nmap –reason 192.168.0.1 |
| Only Display Open Ports | nmap –open [target] | nmap –open 192.168.0.1 |
| Trace Packets | nmap –packet-trace [target] | nmap –packet-trace 192.168.0.1 |
| Display Host Networking | nmap –iflist | nmap –iflist |
| Specify a Network Interface | nmap -e [interface] [target] | nmap -e eth0 192.168.0.1 |
NMAP Scripting Engine
| Goal | Command | Example |
|---|---|---|
| Execute Individual Scripts | nmap –script [script.nse] [target] | nmap –script banner.nse 192.168.0.1 |
| Execute Multiple Scripts | nmap –script [expression] [target] | nmap –script ‘http-*’ 192.168.0.1 |
| Script Categories | all, auth, default, discovery, external, intrusive, malware, safe, vuln | |
| Execute Scripts by Category | nmap –script [category] [target] | nmap –script ‘not intrusive’ 192.168.0.1 |
| Execute Multiple Script Categories | nmap –script [category1,category2,etc] | nmap –script ‘default or safe’ 192.168.0.1 |
| Troubleshoot Scripts | nmap –script [script] –script trace [target] | nmap –script banner.nse –script-trace 192.168.0.1 |
| Update the Script Database | nmap –script-updatedb | nmap –script-updatedb |
Multitaskers
Humans are notoriously bad multitaskers. Even though we convinced ourselves we’re not. Science shows as soon as we start to do multiple things at the same time, our concentration drops, we get sloppy and errors ramp up. Computers on the other hand are excellent multitaskers. Every modern computer can do many, many things at the same time, switching effortlessly between tasks, without ever dropping the ball.
Concurrency
Software that enables this concurrent computing is off course written by humans. Nevertheless, writing correct scalable software that supports concurrency is hard. This is why there are a lot of libraries to help developers with this task. Since 2005 when the first consumer multicore CPU was introduced, the number of cores in CPU’s are steadily increasing. So if we want to keep leveraging all this computing power, this challenge becomes increasingly important.
Android
Android lives in the JVM world and mostly uses Threads for concurrency. For years the default library to use on Android for concurrent programming was RxJava. It provided an abstraction over Threads and made switching between them easy. But it came with a very steep learning curve and was quite a heavy library to include in your app. But there is a new kid on the block; Kotlin coroutines. Since it’s inception in 2017 it has gained rapid traction. In 2019 Google made it the official recommended library to use when writing concurrent and/or asynchronous code on Android. As a result many new AndroidX libraries use coroutines and flow.
Kotlin Flow
Recently the coroutines API has expanded a lot with the addition of different kind of Flows. There are already excellent in depth articles and documentation about coroutines (see; one, two, three). My article will merely provide a cheat sheet on the Flow API in coroutines for use on Android. What kind of Flows are there, their differences, what are the RxJava equivalents and where can you find a quick snippet to get you started. Happy coding
Android Cheat Sheet Github
Meer blogartikelen