1 /*
2 * PgBouncer - Lightweight connection pooler for PostgreSQL.
3 *
4 * Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /* old style V2 header: len:4b code:4b */
20 #define OLD_HEADER_LEN 8
21 /* new style V3 packet header len - type:1b, len:4b */
22 #define NEW_HEADER_LEN 5
23
24 /*
25 * parsed packet header, plus whatever data is
26 * available in SBuf for this packet.
27 *
28 * if (pkt->len == mbuf_avail(&pkt->data))
29 * packet is fully in buffer
30 *
31 * get_header() points pkt->data.pos after header.
32 * to packet body.
33 */
34 struct PktHdr {
35 unsigned type;
36 unsigned len;
37 struct MBuf data;
38 };
39
40 bool get_header(struct MBuf *data, PktHdr *pkt) _MUSTCHECK;
41
42 bool send_pooler_error(PgSocket *client, bool send_ready, bool level_fatal, const char *msg) /*_MUSTCHECK*/;
43 void log_server_error(const char *note, PktHdr *pkt);
44 void parse_server_error(PktHdr *pkt, const char **level_p, const char **msg_p);
45
46 bool add_welcome_parameter(PgPool *pool, const char *key, const char *val) _MUSTCHECK;
47 void finish_welcome_msg(PgSocket *server);
48 bool welcome_client(PgSocket *client) _MUSTCHECK;
49
50 bool answer_authreq(PgSocket *server, PktHdr *pkt) _MUSTCHECK;
51
52 bool send_startup_packet(PgSocket *server) _MUSTCHECK;
53 bool send_sslreq_packet(PgSocket *server) _MUSTCHECK;
54
55 int scan_text_result(struct MBuf *pkt, const char *tupdesc, ...) _MUSTCHECK;
56
57 /* is packet completely in our buffer */
incomplete_pkt(const PktHdr * pkt)58 static inline bool incomplete_pkt(const PktHdr *pkt)
59 {
60 return mbuf_written(&pkt->data) != pkt->len;
61 }
62
63 /* is packet header completely in buffer */
incomplete_header(const struct MBuf * data)64 static inline bool incomplete_header(const struct MBuf *data) {
65 uint32_t avail = mbuf_avail_for_read(data);
66 if (avail >= OLD_HEADER_LEN)
67 return false;
68 if (avail < NEW_HEADER_LEN)
69 return true;
70 /* is it old V2 header? */
71 return data->data[data->read_pos] == 0;
72 }
73
74 /* one char desc */
pkt_desc(const PktHdr * pkt)75 static inline char pkt_desc(const PktHdr *pkt)
76 {
77 return pkt->type > 256 ? '!' : pkt->type;
78 }
79