Pcap4j

https://www.pcap4j.org/
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Pcap4j is a Java library for capturing, crafting, and sending network packets with support for...
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### Install libpcap on Mac

Source: https://www.pcap4j.org/post/install_native_library

Use Homebrew to install the libpcap library.

```bash
brew install libpcap
```

--------------------------------

### Install libpcap on Ubuntu

Source: https://www.pcap4j.org/post/install_native_library

Use the apt package manager to install the libpcap development headers.

```bash
apt-get install libpcap-dev
```

--------------------------------

### Install WinPcap on Windows

Source: https://www.pcap4j.org/post/install_native_library

Use the Chocolatey package manager to install WinPcap.

```bash
choco install winpcap
```

--------------------------------

### Install libpcap on CentOS

Source: https://www.pcap4j.org/post/install_native_library

Use the yum package manager to install the libpcap development headers.

```bash
yum install libpcap-devel
```

--------------------------------

### Extract IPv4 Source Address from Packet

Source: https://www.pcap4j.org/post/get_information_from_the_packet

Use the Packet API to get the IPv4 packet and then extract the source IP address from its header. Ensure the packet contains an IPv4 layer.

```java
IpV4Packet ipV4Packet = packet.get(IpV4Packet.class);
Inet4Address srcAddr = ipV4Packet.getHeader().getSrcAddr();
System.out.println(srcAddr);
```

--------------------------------

### Configure Pcap4J Dependencies

Source: https://www.pcap4j.org/post/add_pcap4j_to_your_project

Add the core and static packet factory libraries to your project build configuration.

```gradle
compile 'org.pcap4j:pcap4j-core:1.+'
compile 'org.pcap4j:pcap4j-packetfactory-static:1.+'
```

```xml
<dependency>
  <groupId>org.pcap4j</groupId>
  <artifactId>pcap4j-core</artifactId>
  <version>[1.0, 2.0)</version>
</dependency>
<dependency>
  <groupId>org.pcap4j</groupId>
  <artifactId>pcap4j-packetfactory-static</artifactId>
  <version>[1.0, 2.0)</version>
</dependency>
```

--------------------------------

### Open Pcap Handle for Packet Capture

Source: https://www.pcap4j.org

Opens a live pcap handle from a network interface with specified snapshot length, promiscuous mode, and timeout. Administrator/root privileges may be needed.

```java
int snapLen = 65536;
PromiscuousMode mode = PromiscuousMode.PROMISCUOUS;
int timeout = 10;
PcapHandle handle = nif.openLive(snapLen, mode, timeout);
```

--------------------------------

### Add Pcap4J Dependencies to Gradle

Source: https://www.pcap4j.org

Adds the Pcap4J core and packet factory static dependencies to a Gradle project.

```gradle
compile 'org.pcap4j:pcap4j-core:1.+'
compile 'org.pcap4j:pcap4j-packetfactory-static:1.+'
```

--------------------------------

### Add Pcap4J Dependencies to Maven

Source: https://www.pcap4j.org

Adds the Pcap4J core and packet factory static dependencies to a Maven project.

```xml
<dependency>
  <groupId>org.pcap4j</groupId>
  <artifactId>pcap4j-core</artifactId>
  <version>[1.0, 2.0)</version>
</dependency>
<dependency>
  <groupId>org.pcap4j</groupId>
  <artifactId>pcap4j-packetfactory-static</artifactId>
  <version>[1.0, 2.0)</version>
</dependency>
```

--------------------------------

### Find Network Interface by IP Address

Source: https://www.pcap4j.org/post/find_a_nif

Use this snippet to find a network interface associated with a specific IP address. Administrator/root privileges may be required.

```java
InetAddress addr = InetAddress.getByName("192.168.10.100");
PcapNetworkInterface nif = Pcaps.getDevByAddress(addr);

```

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### Capture and Close Pcap Handle

Source: https://www.pcap4j.org

Captures the next available packet using the pcap handle and then closes the handle. Ensure the handle is closed after use to release resources.

```java
Packet packet = handle.getNextPacketEx();
handle.close();
```
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