Output TCP flags alongside tuple #466
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Asphaltt
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Jan 15, 2025
It will be helpful to check receiving a RST packet when fail to run `telnet`. ```bash $ sudo ./pwru --output-tcp-flags --filter-func '.*tcp.*' tcp and host 192.168.241.1 and port 8080 2024/12/06 14:30:17 Attaching kprobes (via kprobe-multi)... 146 / 146 [------------------------------------------------------------------------------------------------------------------------------------] 100.00% ? p/s 2024/12/06 14:30:17 Attached (ignored 0) 2024/12/06 14:30:17 Listening for events.. SKB CPU PROCESS NETNS MARK/x IFACE PROTO MTU LEN __sk_buff->cb[] TUPLE FUNC 0xffff91e7c90a98e8 6 <empty>:0 4026531840 0 ens33:2 0x0800 1500 74 [0x00000000,0x00000000,0x00000000,0x00000000,0x00000000] 192.168.241.133:32956->192.168.241.1:8080(tcp:SYN) tcp_wfree 0xffff91e7cf0a3e00 6 <empty>:0 4026531840 0 ens33:2 0x0800 1500 46 [0x00000000,0x00000000,0x00000014,0x00000006,0x00060001] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp4_gro_receive 0xffff91e7cf0a3e00 6 <empty>:0 4026531840 0 ens33:2 0x0800 1500 46 [0x00000000,0x00000000,0x00000014,0x00000006,0x00060001] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_gro_receive 0xffff91e7cf0a3e00 6 <empty>:0 4026531840 0 ens33:2 0x0800 1500 40 [0x00000000,0x00000000,0x00000000,0x00000000,0x00060001] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_v4_early_demux 0xffff91e7cf0a3e00 6 <empty>:0 4026531840 0 ens33:2 0x0800 65536 20 [0x00000000,0x00000000,0x00000000,0x00000000,0x00060001] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_v4_rcv 0xffff91e7cf0a3e00 6 <empty>:0 4026531840 0 ens33:2 0x0800 65536 20 [0x00000000,0x00000000,0x00000000,0x00000000,0x00060001] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_filter 0xffff91e7cf0a3e00 6 <empty>:0 4026531840 0 ens33:2 0x0800 65536 20 [0x00000000,0x00000000,0x00000000,0x00000000,0x00060001] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_v4_fill_cb 0xffff91e7cf0a3e00 6 <empty>:0 0 0 0 0x0800 65536 20 [0x00000000,0x04000014,0x80E6EBB0,0x00000000,0x00000002] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_v4_do_rcv 0xffff91e7cf0a3e00 6 <empty>:0 0 0 0 0x0800 65536 20 [0x00000000,0x04000014,0x80E6EBB0,0x00000000,0x00000002] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_rcv_state_process 0xffff91e7cf0a3e00 6 <empty>:0 0 0 0 0x0800 65536 20 [0x00000000,0x04000014,0x80E6EBB0,0x00000000,0x00000002] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_rcv_synsent_state_process 0xffff91e7cf0a3e00 6 <empty>:0 0 0 0 0x0800 65536 20 [0x00000000,0x04000014,0x80E6EBB0,0x00000000,0x00000002] 192.168.241.1:8080->192.168.241.133:32956(tcp:RST|ACK) tcp_reset ^C2024/12/06 14:30:22 Received signal, exiting program.. 2024/12/06 14:30:22 Detaching kprobes... 4 / 4 [---------------------------------------------------------------------------------------------------------------------------------------] 100.00% 22 p/s ``` Signed-off-by: Leon Hwang <hffilwlqm@gmail.com>
Asphaltt
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Agree with --output-tcp-flags, also raise my concern about " running out of screen space" 😿 |
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It will be helpful to check receiving a RST packet when fail to run
telnet.