The sockaddr_storage returned by accept(2) belongs to session and
not the listener. Move it to a place where it belongs: struct
session.
#include <openssl/ssl.h>
/* ssl.c */
void ssl_init(void);
void *ssl_setup(void);
void *pop3s_init(SSL_CTX *, int);
void ssl_error(const char *);
/* ssl_privsep.c */
int ssl_ctx_use_private_key(SSL_CTX *, char *, off_t);
int ssl_ctx_use_certificate_chain(SSL_CTX *, char *, off_t);