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test: assume priv ports start at 1024 if it can't be changed #46536

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Merged
merged 3 commits into from
Mar 2, 2023
Merged

test: assume priv ports start at 1024 if it can't be changed #46536

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test: assume priv ports start at 1024 if it can't be changed
Feb 7, 2023
a5017cf
Update to remove TOCTOU stat-then-open pattern
Feb 7, 2023
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Previous update reverted old v18 method, now based on new v19
Feb 8, 2023
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11 changes: 8 additions & 3 deletions test/parallel/test-cluster-bind-privileged-port.js
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,14 @@ const net = require('net');
const { readFileSync } = require('fs');

if (common.isLinux) {
const unprivilegedPortStart = parseInt(readFileSync('/proc/sys/net/ipv4/ip_unprivileged_port_start'));
if (unprivilegedPortStart <= 42) {
common.skip('Port 42 is unprivileged');
try {
const unprivilegedPortStart = parseInt(readFileSync('/proc/sys/net/ipv4/ip_unprivileged_port_start'));
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Just a nit that you are free to ignore. I would put only readFileSync() in the try...catch.

let unprivilegedPortStart:

try {
  unprivilegedPortStart = readFileSync('/proc/sys/net/ipv4/ip_unprivileged_port_start');
} catch {
  // Do nothing.
}

if (parseInt(unprivilegedPortStart) <= 42) {
  common.skip('Port 42 is unprivileged');
}

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I considered that (and even wrote it). The above I dislike a bit because parseInt returns NaN and Nan <=42 which means it'll work but it's very obscure. First thing you think is "isn't this broken"? So you probably want a "unprivilegedPortStart = 1024;" in the catch which is what the scenario REALLY is when the readFileSync fails.

BUT The entire test of minimum ports, etc is irrelevant when that read fails. That indicates the ability to change the minimum doesn't exist hence even considering it is irrelevant.

So I went with "if the read fails, this entire block of code is irrelevant".

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We could be explicit and do

if (unprivilegedPortStart !== undefined && parseInt(unprivilegedPortStart) <= 42) {
  common.skip('Port 42 is unprivileged');
}

My reasoning is that only things that are expected to throws errors should be in the try block to avoid hiding unexpected exception.

Anyway, it is only a nit. It is ok as is.

if (unprivilegedPortStart <= 42) {
common.skip('Port 42 is unprivileged');
}
} catch {
// Do nothing, feature doesn't exist, minimum is 1024 so 42 is usable.
// Continue...
}
}

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