ChatGPT fixes#27

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odeneriksson wants to merge 9 commits intodotse:masterfrom

odeneriksson:master

Commits on Sep 22, 2025

Use cryptographically secure randomness for the 16‑byte WebSocket
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Remove unconditional GNUTLS_VERIFY_ALLOW_BROKEN and gate it behind
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Ensure file descriptors are not inherited by child processes:
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Avoid leaking file descriptors to child processes. Close all fds >= 3
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Fix build error by including <dirent.h> for DIR/opendir/readdir,
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Protect external_cmd() by:
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Fix multiple robustness issues in json11:
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Generate upload buffer content with cryptographically strong bytes.
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Replace hardcoded /usr/local include and lib paths with pkg-config
odeneriksson
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