1. Article purpose[edit source]
This article provides the basic information needed to start using the Linux tool: tcpdump[1].
2. Introduction[edit source]
The following table provides a brief description of the tool, as well as its availability depending on the software packages:
: this tool is either present (ready to use or to be activated), or can be integrated and activated on the software package.
: this tool is not present and cannot be integrated, or it is present but cannot be activated on the software package.
| Tool | STM32MPU Embedded Software distribution | STM32MPU Embedded Software distribution for Android™ | ||||||
|---|---|---|---|---|---|---|---|---|
| Name | Category | Purpose | Starter Package | Developer Package | Distribution Package | Starter Package | Developer Package | Distribution Package |
| tcpdump | Monitoring tools | tcpdump[1] is a common packet analyzer that runs under the command line. It allows the user to display TCP/IP and other packets being transmitted or received over a network to which the computer is connected. | |
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3. Installing the trace and debug tool on your target board[edit source]
3.1. Using the STM32MPU Embedded Software distribution[edit source]
tcpdump is installed by default and ready to be used with all STM32MPU Embedded Software Packages.
which tcpdump /usr/sbin/tcpdump
tcpdump is integrated in weston image distribution through meta-st package: meta-st/meta-st-openstlinux/recipes-st/packagegroups/packagegroup-framework-tools.bb.
RDEPENDS_packagegroup-framework-tools-network = "\
tcpdump \
iptables \
...
3.2. Using the STM32MPU Embedded Software distribution for Android™[edit source]
tcpdump is installed by default (/system/xbin/tcpdump) and is ready to be used with all STM32MPU software packages for Android™, as soon as debug mode is enable (eng or userdebug build variants). Please see external/tcpdump/Android.mk.
which tcpdump /system/xbin/tcpdump
4. Getting started[edit source]
- Command line description
tcpdump --help
Usage: tcpdump [-aAbdDefhHIJKlLnNOpqStuUvxX#] [ -B size ] [ -c count ]
[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
[ -i interface ] [ -j tstamptype ] [ -M secret ] [ --number ]
[ -Q in|out|inout ]
[ -r file ] [ -s snaplen ] [ --time-stamp-precision precision ]
[ --immediate-mode ] [ -T type ] [ --version ] [ -V file ]
[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]
[ -Z user ] [ expression ]
- Dump tcp traffic on eth0 interface (you can use ip addr show command to know the list of network interface available)
tcpdump -i eth0 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes 10:55:33.107716 IP 10.48.2.165.ssh > 10.201.23.91.52308: Flags [P.], seq 4266254400:4266254528, ack 3520172211, win 333, options [nop,nop,TS val 57572827 ecr 260374058], length 128 10:55:33.108933 IP 10.201.23.91.52308 > 10.48.2.165.ssh: Flags [.], ack 128, win 1444, options [nop,nop,TS val 260374095 ecr 57572827], length 0 ...
5. To go further[edit source]
Some usage examples[2].
6. References[edit source]
- Useful external links
| Document link | Document Type | Description |
|---|---|---|
| tcpdump manpage | Standard | linux.die.net |
| tcpdump (wikipedia.org) | Standard | wikipedia.org |