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/*
* PgBouncer - Lightweight connection pooler for PostgreSQL.
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* old style V2 header: len:4b code:4b */
#define OLD_HEADER_LEN 8
/* new style V3 packet header len - type:1b, len:4b */
#define NEW_HEADER_LEN 5
/*
* parsed packet header, plus whatever data is
* available in SBuf for this packet.
*
* if (pkt->len == mbuf_avail(&pkt->data))
* packet is fully in buffer
*
* get_header() points pkt->data.pos after header.
* to packet body.
*/
struct PktHdr {
unsigned type;
unsigned len;
struct MBuf data;
};
bool get_header(struct MBuf *data, PktHdr *pkt) _MUSTCHECK;
bool send_pooler_error(PgSocket *client, bool send_ready, const char *msg) /*_MUSTCHECK*/;
void log_server_error(const char *note, PktHdr *pkt);
void parse_server_error(PktHdr *pkt, const char **level_p, const char **msg_p);
bool add_welcome_parameter(PgPool *pool, const char *key, const char *val) _MUSTCHECK;
void finish_welcome_msg(PgSocket *server);
bool welcome_client(PgSocket *client) _MUSTCHECK;
bool answer_authreq(PgSocket *server, PktHdr *pkt) _MUSTCHECK;
bool send_startup_packet(PgSocket *server) _MUSTCHECK;
bool send_sslreq_packet(PgSocket *server) _MUSTCHECK;
int scan_text_result(struct MBuf *pkt, const char *tupdesc, ...) _MUSTCHECK;
/* is packet completely in our buffer */
static inline bool incomplete_pkt(const PktHdr *pkt)
{
return mbuf_written(&pkt->data) != pkt->len;
}
/* is packet header completely in buffer */
static inline bool incomplete_header(const struct MBuf *data) {
uint32_t avail = mbuf_avail_for_read(data);
if (avail >= OLD_HEADER_LEN)
return false;
if (avail < NEW_HEADER_LEN)
return true;
/* is it old V2 header? */
return data->data[data->read_pos] == 0;
}
/* one char desc */
static inline char pkt_desc(const PktHdr *pkt)
{
return pkt->type > 256 ? '!' : pkt->type;
}
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