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ptcpdump is the tcpdump(8) implementation using eBPF, with an extra feature: it adds process info as packet comments for each Packet when possible. Inspired by jschwinger233/skbdump.
- Process-aware
- Aware of the process information associated with the packets.
- Supports filtering packets by process ID and process name.
- Container-aware and Kubernetes-aware
- Aware of the container and pod information associated with the packets.
- Supports multiple container runtimes: Docker Engine and containerd
- Supports filtering packets by container ID, container name and pod name.
- Supports using pcap-filter(7) syntax for filtering packets.
- Directly applies filters in the kernel space.
- Supports saving captured packets in the PcapNG format for offline analysis with third-party tools such as Wireshark.
You can download the statically linked executable for x86_64 and arm64 from the releases page.
Linux kernel version >= 5.2.
Filter like tcpdump:
sudo ptcpdump -i eth0 tcp
sudo ptcpdump -i eth0 tcp and port 80 and host 10.10.1.1
sudo ptcpdump -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-fin) != 0'
Multiple interfaces:
sudo ptcpdump -i eth0 -i lo
Filter by process:
sudo ptcpdump -i any --pid 1234
sudo ptcpdump -i any --pname curl
Capture by process via run target program:
sudo ptcpdump -i any -- curl ubuntu.com
Filter by container:
sudo ptcpdump -i any --container-id 36f0310403b1
sudo ptcpdump -i any --container-name test
Filter by Pod:
sudo ptcpdump -i any --pod-name test.default
Save data in PcapNG format:
sudo ptcpdump -i any -w demo.pcapng
sudo ptcpdump -i any -w - port 80 | tcpdump -n -r -
sudo ptcpdump -i any -w - port 80 | tshark -r -
Default:
09:32:09.718892 vethee2a302f wget.3553008 In IP 10.244.0.2.33426 > 139.178.84.217.80: Flags [S], seq 4113492822, win 64240, length 0, ParentProc [python3.834381], Container [test], Pod [test.default]
09:32:09.718941 eth0 wget.3553008 Out IP 172.19.0.2.33426 > 139.178.84.217.80: Flags [S], seq 4113492822, win 64240, length 0, ParentProc [python3.834381], Container [test], Pod [test.default]
With -v:
13:44:41.529003 eth0 In IP (tos 0x4, ttl 45, id 45428, offset 0, flags [DF], proto TCP (6), length 52)
139.178.84.217.443 > 172.19.0.2.42606: Flags [.], cksum 0x5284, seq 3173118145, ack 1385712707, win 118, options [nop,nop,TS val 134560683 ecr 1627716996], length 0
Process (pid 553587, cmd /usr/bin/wget, args wget kernel.org)
ParentProc (pid 553296, cmd /bin/sh, args sh)
Container (name test, id d9028334568bf75a5a084963a8f98f78c56bba7f45f823b3780a135b71b91e95, image docker.io/library/alpine:3.18, labels {"io.cri-containerd.kind":"container","io.kubernetes.container.name":"test","io.kubernetes.pod.name":"test","io.kubernetes.pod.namespace":"default","io.kubernetes.pod.uid":"9e4bc54b-de48-4b1c-8b9e-54709f67ed0c"})
Pod (name test, namespace default, UID 9e4bc54b-de48-4b1c-8b9e-54709f67ed0c, labels {"run":"test"}, annotations {"kubernetes.io/config.seen":"2024-07-21T12:41:00.460249620Z","kubernetes.io/config.source":"api"})
Usage:
ptcpdump [flags] [expression] [-- command [args]]
Examples:
sudo ptcpdump -i any tcp
sudo ptcpdump -i eth0 -i lo
sudo ptcpdump -i eth0 --pid 1234 port 80 and host 10.10.1.1
sudo ptcpdump -i any --pname curl
sudo ptcpdump -i any -- curl ubuntu.com
sudo ptcpdump -i any -w ptcpdump.pcapng
sudo ptcpdump -i any -w - port 80 | tcpdump -n -r -
sudo ptcpdump -i any -w - port 80 | tshark -r -
ptcpdump -r ptcpdump.pcapng
Expression: see "man 7 pcap-filter"
Flags:
--container-id string Filter by container id (only TCP and UDP packets are supported)
--container-name string Filter by container name (only TCP and UDP packets are supported)
--containerd-address string Address of containerd service (default "/run/containerd/containerd.sock")
--count Print only on stdout the packet count when reading capture file instead of parsing/printing the packets
--cri-runtime-address string Address of CRI container runtime service (default: uses in order the first successful one of [/run/containerd/containerd.sock, /run/crio/crio.sock, /var/run/cri-dockerd.sock, /var/run/dockershim.sock])
-Q, --direction string Choose send/receive direction for which packets should be captured. Possible values are 'in', 'out' and 'inout' (default "inout")
--docker-address string Address of Docker Engine service (default "/var/run/docker.sock")
-f, --follow-forks Trace child processes as they are created by currently traced processes when filter by process
-h, --help help for ptcpdump
-i, --interface strings Interfaces to capture (default [lo])
--list-interfaces Print the list of the network interfaces available on the system
--log-level string Set the logging level ("debug", "info", "warn", "error", "fatal") (default "warn")
--oneline Print parsed packet output in a single line
--pid uint Filter by process ID (only TCP and UDP packets are supported)
--pname string Filter by process name (only TCP and UDP packets are supported)
--pod-name string Filter by pod name (format: NAME.NAMESPACE, only TCP and UDP packets are supported)
--print Print parsed packet output, even if the raw packets are being saved to a file with the -w flag
-r, --read-file string Read packets from file (which was created with the -w option). e.g. ptcpdump.pcapng
-c, --receive-count uint Exit after receiving count packets
-s, --snapshot-length uint32 Snarf snaplen bytes of data from each packet rather than the default of 262144 bytes (default 262144)
-v, --verbose count When parsing and printing, produce (slightly more) verbose output
--version Print the ptcpdump and libpcap version strings and exit
-w, --write-file string Write the raw packets to file rather than parsing and printing them out. They can later be printed with the -r option. Standard output is used if file is '-'. e.g. ptcpdump.pcapng
| Options | tcpdump | ptcpdump |
|---|---|---|
| expression | β | β |
| -i interface, --interface=interface | β | β |
| -w x.pcapng | β | β (with process info) |
| -w x.pcap | β | β (without process info) |
| -w - | β | β |
| -r x.pcapng, -r x.pcap | β | β |
| -r - | β | |
| --pid process_id | β | |
| --pname process_name | β | |
| --container-id container_id | β | |
| --container-name container_name | β | |
| --pod-name pod_name.namespace | β | |
| -f, --follow-forks | β | |
| -- command [args] | β | |
| --oneline | β | |
| β | β | |
| -c count | β | β |
| -Q direction, --direction=direction | β | β |
| -D, --list-interfaces | β | β |
| -A | β | |
| -B bufer_size, --buffer-size=buffer_size | β | |
| --count | β | β |
| -C *file_size | β | |
| -d | β | |
| -dd | β | |
| -ddd | β | |
| -e | β | |
| -f | β | β |
| -F file | β | |
| -G rotate_seconds | β | |
| -h, --help | β | β |
| --version | β | β |
| -H | β | |
| -l, --monitor-mode | β | |
| --immediate-mode | β | |
| -j tstamp_type, --time-stamp-type=tstamp_type | β | |
| -J, --list-time-stamp-types | β | |
| --time-stamp-precision=tstamp_precision | β | |
| --micro | β | |
| --nano | β | |
| -K, --dont-verify-checksums | β | |
| -l | β | |
| -L, --list-data-link-types | β | |
| -m module | β | |
| -M secret | β | |
| -n | β | β |
| -N | β | |
| -#, --number | β | β |
| -O, --no-optimize | β | |
| -p, --no-promiscuous-mode | β | β |
| -S, --absolute-tcp-sequence-numbers | β | |
| -s snaplen, --snapshot-length=snaplen | β | β |
| -T type | β | |
| -t | β | β |
| -tt | β | |
| -ttt | β | |
| -tttt | β | |
| -u | β | |
| -U, --packet-buffered | β | |
| -v | β | β |
| -vv | β | |
| -vvv | β | |
| -V file | β | |
| -W filecont | β | |
| -x | β | |
| -xx | β | |
| -X | β | |
| -XX | β | |
| -y datalinktype, --linktype=datalinktype | β | |
| -z postrotate-command | β | |
| -Z user, --relinquish-privileges=user | β |
-
Build eBPF programs:
make build-bpf -
Build ptcpdump:
make build
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