CANSNIFFER(1)

💅 CANSNIFFER

okay bestie, so this is the manual page for cansniffer, and it lives in section 1 of the User Commands of the manual — the ✨ one and only ✨ cansniffer, version 2023.03-1build1. she's cute, she's volatile, she's here to watch your CAN bus like it's her fave reality show 🦋

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🌸 NAME

cansniffer — like, the manual page for cansniffer 2023.03-1build1? that's her, that's the girl 💖

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✨ SYNOPSIS

cansniffer [can-interface]

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🎀 DESCRIPTION

cansniffer — a volatile CAN content visualizer. yes, volatile. she does not remember, she does not keep receipts, she just shows you the vibes in real time 👑 no cap.

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💅 OPTIONS

she has options. so many options. iconic behaviour honestly:

• -q — quiet mode, aka all IDs deactivated. she is on mute bestie, not a single ID is making noise.
• -r <name> — read sniffset.name from a file. loading your settings like a saved playlist 💜
• -e — fix extended frame format output, no auto detect. you tell her what the frame format is, she doesn't guess.
• -b — start her off in binary mode.
• -8 — start in binary mode — this one's for EFF on 80 chars.
• -B — start in binary mode with gap — careful, this one exceeds 80 chars! 💀
• -c — color changes. rainbow-ify the deltas 🌈
• -f <mode> — CAN FD mode, choose ur fighter:
  • 0 = OFF
  • 1 = ON
  • 2 = auto detect
  • default: 2
• -t <time> — timeout for ID display, in [x10ms], default: 500, or 0 = OFF. she'll let an ID linger, then she moves on (as she should).
• -h <time> — hold marker on changes, in [x10ms], default: 100.
• -l <time> — loop time (display), in [x10ms], default: 20.
• -? — print this help text. she'll hand you the whole menu.

pro tip bestie: use the interface name any to receive from all can-interfaces. she's not picky, she's everywhere 🫶

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💖 commands that can be entered at runtime:

the group chat is LIVE. type these while she's running:

• q<ENTER> — quit. bye babes 😭
• b<ENTER> — toggle binary / HEX-ASCII output.
• 8<ENTER> — toggle binary / HEX-ASCII output (small for EFF on 80 chars).
• B<ENTER> — toggle binary with gap / HEX-ASCII output (exceeds 80 chars!).
• c<ENTER> — toggle color mode. rainbows on, rainbows off.
• @<ENTER> — toggle ASCII output (disabled for CAN FD by default).
• <SPACE><ENTER> — force a clear screen. a little palate cleanser ✨
• #<ENTER> — notch currently marked/changed bits (can be used repeatedly). it's giving scrapbooking 📸
• *<ENTER> — clear notched marked.
• rMYNAME<ENTER> — read settings file (filter/notch).
• wMYNAME<ENTER> — write settings file (filter/notch).
• a<ENTER> — enable 'a'll SFF CAN-IDs to sniff.
• n<ENTER> — enable 'n'one SFF CAN-IDs to sniff.
• A<ENTER> — enable 'A'll EFF CAN-IDs to sniff.
• N<ENTER> — enable 'N'one EFF CAN-IDs to sniff.
• +FILTER<ENTER> — add CAN-IDs to sniff.
• -FILTER<ENTER> — remove CAN-IDs to sniff.

FILTER can be a single CAN-ID or a CAN-ID/Bitmask:

🌟 single SFF 11 bit IDs:

+1F5<ENTER>               - add SFF CAN-ID 0x1F5

-42E<ENTER>               - remove SFF CAN-ID 0x42E

🌟 single EFF 29 bit IDs:

+18FEDF55<ENTER>          - add EFF CAN-ID 0x18FEDF55

-00000090<ENTER>          - remove EFF CAN-ID 0x00000090

🌟 CAN-ID/Bitmask SFF:

-42E7FF<ENTER>            - remove SFF CAN-ID 0x42E (using Bitmask)

-500700<ENTER>            - remove SFF CAN-IDs 0x500 - 0x5FF

+400600<ENTER>            - add SFF CAN-IDs 0x400 - 0x5FF

+000000<ENTER>            - add all SFF CAN-IDs

-000000<ENTER>            - remove all SFF CAN-IDs

🌟 CAN-ID/Bitmask EFF:

-0000000000000000<ENTER>  - remove all EFF CAN-IDs

+12345678000000FF<ENTER>  - add EFF CAN IDs xxxxxx78

+0000000000000000<ENTER>  - add all EFF CAN-IDs

so like, if (id & filter) == (sniff-id & filter) the action (+/-) is performed — which is quite easy when the filter is 000 resp. 00000000 for EFF. match made in bitwise heaven 💞

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and that's the whole page, bestie. this was cansniffer version 2023.03-1build1, dated December 2025 — stay nosy, stay sniffing, and may your bus always be legible 🌸💜🦋 no cap, periodt.