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;