NAME
SSL_CTX_add_session, SSL_add_session, SSL_CTX_remove_session, SSL_remove_session — manipulate session cache
Synopsis
#include <openssl/ssl.h>
int
SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c);
int
SSL_add_session(SSL_CTX *ctx, SSL_SESSION *c);
int SSL_CTX_remove_session(SSL_CTX
*ctx, SSL_SESSION *c);
int SSL_remove_session(SSL_CTX
*ctx, SSL_SESSION *c);
DESCRIPTION
SSL_CTX_add_session() adds the session c to the context ctx.
The reference count for session c is incremented by 1. If a session
with the same session id already exists, the old session is removed
by calling SSL_SESSION_free(3).
SSL_CTX_remove_session() removes the session c from the context
ctx. SSL_SESSION_free(3) is called once for c.
SSL_add_session() and SSL_remove_session() are synonyms for
their SSL_CTX_*() counterparts.
NOTES
When adding a new session to the internal session cache, it
is examined whether a session with the same session id already exists.
In this case it is assumed that both sessions are identical. If
the same session is stored in a different SSL_SESSION object, The
old session is removed and replaced by the new session. If the session
is actually identical (the SSL_SESSION object is identical), SSL_CTX_add_session()
is a no-op, and the return value is 0.
If a server SSL_CTX is configured with the SSL_SESS_CACHE_NO_INTERNAL_STORE
flag then the internal cache will not be populated automatically
by new sessions negotiated by the SSL/TLS implementation, even though
the internal cache will be searched automatically for session-resume
requests (the latter can be surpressed by SSL_SESS_CACHE_NO_INTERNAL_LOOKUP).
So the application can use SSL_CTX_add_session() directly to have
full control over the sessions that can be resumed if desired.
RETURN VALUES
The following values are returned by all functions:
0
The operation failed. In case of the add operation, it was
tried to add the same (identical) session twice. In case of the
remove operation, the session was not found in the cache.
1
The operation succeeded.
SEE ALSO
ssl(3), SSL_CTX_set_session_cache_mode(3), SSL_SESSION_free(3)
