SSL_COPY_SESSION_ID(3)

💅 SSL_COPY_SESSION_ID(3) 💅

okay so bestie, we're in SSL_COPY_SESSION_ID territory — that's the <italic>Library Functions Manual</italic> section, so grab a lil snack and let's go 🍓

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✨ NAME ✨

SSL_copy_session_id — the function that copies session deets from one SSL object to another, no cap 🫶

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🌸 SYNOPSIS 🌸

library “libssl” libcrypto #include <openssl/ssl.h>

int
SSL_copy_session_id(SSL *to, const SSL *from);

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🎀 DESCRIPTION 🎀

k so SSL_copy_session_id() literally takes all this data from from and drops it into to. the way it just… copies. iconic.

• the pointer to the SSL_SESSION object, and it increments its reference count by 1 — sharing is caring, but be responsible okay? 😌
• the pointer to the SSL_METHOD object; and like, heads up, if that changes the method, protocol-specific data gets reinitialized — it's giving fresh start energy ✨
• the pointer to the CERT object, again with the reference count bumped by 1 💖
• the session ID context

fr fr, this function is used internally by SSL_dup(3) and by BIO_ssl_copy_session_id(3) — our behind-the-scenes main character 👑

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⭐ RETURN VALUES ⭐

SSL_copy_session_id() returns 1 when it slays and 0 on error. that's it, that's the whole vibe check 😭

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🦋 SEE ALSO 🦋

BIO_ssl_copy_session_id(3), ssl(3), SSL_dup(3), SSL_get_session(3), SSL_SESSION_get_id(3), SSL_SESSION_new(3), SSL_set_session(3), SSL_set_session_id_context(3)

(yes, go read all of them. i'll wait 💅)

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🌈 HISTORY 🌈

SSL_copy_session_id() appeared in SSLeay 0.4 or earlier — like, ancient ancient — and has been available since OpenBSD 2.4. she's been booked and busy for decades at this point 👑

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💀 BUGS 💀

ok so this is the part where we get serious for a sec 🙈 — failures of CRYPTO_add(3) are silently ignored and may leave to in an invalid or inconsistent state. like, no error, no nothing, just vibes and possibly corruption. be careful bestie 😭

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so yeah that's the whole page 🧚 mwah, go forth and copy sessions responsibly 💜

— from your girl, written up for the Debian build, dated June 8, 2025, page SSL_COPY_SESSION_ID(3) 🎀