When the file doesnt exists (--rsa-public-key-path), execution results in Segmentation fault

[declum]

Context

• Version of iperf3:

iperf 3.9 (cJSON 1.7.13)
Linux lcm-worker-vm 5.15.0-60-generic #66-Ubuntu SMP Fri Jan 20 14:29:49 UTC 2023 x86_64
Optional features available: CPU affinity setting, IPv6 flow label, SCTP, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing, authentication

iperf 3.12 (cJSON 1.7.15)
Darwin cjebakumarPF2K7.vmware.com 22.2.0 Darwin Kernel Version 22.2.0: Fri Nov 11 02:03:51 PST 2022; root:xnu-8792.61.2~4/RELEASE_ARM64_T6000 arm64
Optional features available: sendfile / zerocopy, authentication, support IPv4 don't fragment

• Operating system (and distribution, if any): Mac 13.1 (installed by brew) / Ubuntu 22.04

Bug Report

When the file doesnt exists (--rsa-public-key-path), execution results in Segmentation fault

• Expected Behavior
  iperf3 should show a message that the file doesn't exists. Currently, it emits Segmentation fault (as String) even for -J/--json flag. So the caller needs to have special handling.

• Actual Behavior
  Segmentation fault

• Steps to Reproduce
  iperf3 --get-server-output --json -c --port 5201 --username user --rsa-public-key-path /tmp/public-missing-file.pem --connect-timeout 3000 --time 5
  Password:
  Segmentation fault (core dumped)

• Possible Solution
  stats the file, and show error if its not found.