port data structure from febe

libpq-be-fragment.h

typedef struct Port
{
	pgsocket	sock;			/* File descriptor */
	bool		noblock;		/* is the socket in non-blocking mode? */
	ProtocolVersion proto;		/* FE/BE protocol version */
	SockAddr	laddr;			/* local addr (postmaster) */
	SockAddr	raddr;			/* remote addr (client) */
	char	   *remote_host;	/* name (or ip addr) of remote host */
	char	   *remote_hostname;/* name (not ip addr) of remote host, if
								 * available */
	int			remote_hostname_resolv; /* +1 = remote_hostname is known to
										 * resolve to client's IP address; -1
										 * = remote_hostname is known NOT to
										 * resolve to client's IP address; 0 =
										 * we have not done the forward DNS
										 * lookup yet */
	char	   *remote_port;	/* text rep of remote port */
	CAC_state	canAcceptConnections;	/* postmaster connection status */

	/*
	 * Information that needs to be saved from the startup packet and passed
	 * into backend execution.	"char *" fields are NULL if not set.
	 * guc_options points to a List of alternating option names and values.
	 */
	char	   *database_name;
	char	   *user_name;
	char	   *cmdline_options;
	List	   *guc_options;

	/*
	 * Information that needs to be held during the authentication cycle.
	 */
	HbaLine    *hba;
	char		md5Salt[4];		/* Password salt */

	/*
	 * Information that really has no business at all being in struct Port,
	 * but since it gets used by elog.c in the same way as database_name and
	 * other members of this struct, we may as well keep it here.
	 */
	TimestampTz SessionStartTime;		/* backend start time */

	/*
	 * TCP keepalive settings.
	 *
	 * default values are 0 if AF_UNIX or not yet known; current values are 0
	 * if AF_UNIX or using the default. Also, -1 in a default value means we
	 * were unable to find out the default (getsockopt failed).
	 */
	int			default_keepalives_idle;
	int			default_keepalives_interval;
	int			default_keepalives_count;
	int			keepalives_idle;
	int			keepalives_interval;
	int			keepalives_count;

#if defined(ENABLE_GSS) || defined(ENABLE_SSPI)

	/*
	 * If GSSAPI is supported, store GSSAPI information. Oterwise, store a
	 * NULL pointer to make sure offsets in the struct remain the same.
	 */
	pg_gssinfo *gss;
#else
	void	   *gss;
#endif

	/*
	 * SSL structures (keep these last so that USE_SSL doesn't affect
	 * locations of other fields)
	 */
#ifdef USE_SSL
	SSL		   *ssl;
	X509	   *peer;
	char		peer_dn[128 + 1];
	char		peer_cn[SM_USER + 1];
	unsigned long count;
#endif
} Port;