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* THERE IS ABSOLUTELY NO WARRANTY FOR THIS PROGRAM. * products derived from this software without prior written permission. The names "tcpdump" or "libpcap" may not be used to endorse or promote Redistributions in binary form must reproduce the above copyright * notice at the top of this source file, this list of conditions and the Redistributions of source code must retain the Tcpdump Group copyright Because this is a derivative work, you must comply with the "sniffer.c" * This software, "sniffex.c", is a derivative work of "sniffer.c" and is * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * OR SERVICES LOSS OF USE, DATA, OR PROFITS OR BUSINESS INTERRUPTION) * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * products derived from this software without prior written permission The name "Tim Carstens" may not be used to endorse or promote * documentation and/or other materials provided with the distribution. * notice, this list of conditions and the following disclaimer in the * notice, this list of conditions and the following disclaimer. Redistributions of source code must retain the above copyright * modification, are permitted provided that the following conditions * Redistribution and use in source and binary forms, with or without * "sniffer.c" is distributed under these terms: * demonstration source code, released as follows:

* This software is a modification of Tim Carstens' "sniffer.c"

* demonstration of the libpcap library available at: * This software is intended to be used as a practical example and * Sniffer example of TCP/IP packet capture using libpcap.

We have compiled this on ubuntu 16.04, and run it on laptop with wifi interface as wlan0, hence it will capture the wifi packets from the laptop. Following program captures the packets from the wireless interface of the device on which the compiled binary will be running. Libpcap provides functions for user-level packet capture, used in low-level network monitoring.