Comments (6)
sudo chmod o+r /dev/bpf*
should help in reading of Berkley Packet Filter.
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I have no idea, I don't use macos. However, the tests all run fine on macos via Travis.
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Thanks for your quick reply!
Any clues about why this can be happening? When I start the App from the terminal and using sudo
it's working fine.
from cap.
Most likely a lack of permissions as the error text suggests. On most platforms you have to have special privileges to be able to start capturing packets on most network interfaces.
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@mscdex I have a similar problem on LINUX. I have libpcap and libpcap-dev installed.
But at
var linkType = c.open(device, filter, bufSize, buffer);
I got
Error: socket: Operation not permited
Do i need root privilege to able to start capturing packets on linux?
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Yes, the best solution is to start as root, start listening for packets, and then drop the privileges of the process using process.setgid()
and process.setuid()
to something more appropriate, such as the current user and group (or perhaps nobody/nobody). Perform these steps before doing anything else (including require()
ing other non-node core modules). This way you can ensure that nothing else in the node process (e.g. third party modules) gets superuser privileges, which is good for security.
This is also a better solution than what you may find elsewhere online which may suggest to use setcap
on the node executable which is a huge security issue because the same node executable is used to execute any and all scripts, not just the one using cap
(and setcap
can't be used on a shell script or limited to a specific node script).
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Related Issues (20)
- 0 bytes packets capture only HOT 11
- Issue installing cap on Windows 10 HOT 6
- TypeError: Cannot read property 'prototype' of undefined HOT 3
- 'cap.node' was compiled against a different Node.js version using NODE_MODULE_VERSION 83. This version of Node.js requires NODE_MODULE_VERSION 89. HOT 1
- Create a packet
- This module was compiled agianst a different Node.js issue.
- `Cap.deviceList()` Permissions error HOT 2
- "Segmentation fault (core dumped)" while using cap to send many packet (number of packets < 60) HOT 1
- how to check if npcap is installed on the machine HOT 1
- Return read packets immediately on Windows 10 HOT 2
- "The specified module could not be found" HOT 5
- Does not compile under the newest node-gyp / electron-gyp HOT 2
- NODE_MODULE_VERSION 72. This version of Node.js requires NODE_MODULE_VERSION 73. Please try re-compiling or re-installing HOT 13
- .
- Does not find Pcap Library HOT 1
- Loop starvation HOT 2
- Resend packet captured from Wireshark HOT 5
- Can I send a WebSocket package without worrying about ACK number or Seq number? HOT 1
- Capture TCP segment of Reassembled PDU?
- How do I regenerate the seq number to replay captured traffic?
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