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|
/*
* Copyright (C) Igor Sysoev
*/
/* the library supports the subset of the MySQL 4.1+ protocol (version 10) */
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_event_connect.h>
#include <ngx_mysql.h>
#if (NGX_HAVE_OPENSSL_SHA1_H)
#include <openssl/sha.h>
#else
#include <sha.h>
#endif
#define NGX_MYSQL_LONG_PASSWORD 0x0001
#define NGX_MYSQL_CONNECT_WITH_DB 0x0008
#define NGX_MYSQL_PROTOCOL_41 0x0200
#define NGX_MYSQL_SECURE_CONNECTION 0x8000
#define NGX_MYSQL_CMD_QUERY 3
typedef struct {
u_char pktlen[3];
u_char pktn;
u_char protocol;
u_char version[1]; /* NULL-terminated string */
} ngx_mysql_greeting1_pkt_t;
typedef struct {
u_char thread[4];
u_char salt1[9];
u_char capacity[2];
u_char charset;
u_char status[2];
u_char zero[13];
u_char salt2[13];
} ngx_mysql_greeting2_pkt_t;
typedef struct {
u_char pktlen[3];
u_char pktn;
u_char capacity[4];
u_char max_packet[4];
u_char charset;
u_char zero[23];
u_char login[1]; /* NULL-terminated string */
/*
* u_char passwd_len; 0 if no password
* u_char passwd[20];
*
* u_char database[1]; NULL-terminated string
*/
} ngx_mysql_auth_pkt_t;
typedef struct {
u_char pktlen[3];
u_char pktn;
u_char fields;
} ngx_mysql_response_pkt_t;
typedef struct {
u_char pktlen[3];
u_char pktn;
u_char err;
u_char code[2];
u_char message[1]; /* string */
} ngx_mysql_error_pkt_t;
typedef struct {
u_char pktlen[3];
u_char pktn;
u_char command;
u_char arg[1]; /* string */
} ngx_mysql_command_pkt_t;
static void ngx_mysql_read_server_greeting(ngx_event_t *rev);
static void ngx_mysql_empty_handler(ngx_event_t *wev);
static void ngx_mysql_read_auth_result(ngx_event_t *rev);
static void ngx_mysql_read_query_result(ngx_event_t *rev);
static void ngx_mysql_close(ngx_mysql_t *m, ngx_int_t rc);
ngx_int_t
ngx_mysql_connect(ngx_mysql_t *m)
{
ngx_int_t rc;
#if 0
if (cached) {
return NGX_OK;
}
#endif
m->peer.log->action = "connecting to mysql server";
rc = ngx_event_connect_peer(&m->peer);
if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
return rc;
}
m->peer.connection->data = m;
m->peer.connection->read->handler = ngx_mysql_read_server_greeting;
m->peer.connection->write->handler = ngx_mysql_empty_handler;
ngx_add_timer(m->peer.connection->read, /* STUB */ 5000);
return NGX_OK;
}
static void
ngx_mysql_read_server_greeting(ngx_event_t *rev)
{
size_t len;
u_char *p;
ssize_t n;
ngx_uint_t i, capacity;
ngx_mysql_t *m;
ngx_connection_t *c;
ngx_mysql_greeting1_pkt_t *gr1;
ngx_mysql_greeting2_pkt_t *gr2;
ngx_mysql_auth_pkt_t *auth;
SHA_CTX sha;
u_char hash1[20], hash2[20];
c = rev->data;
m = c->data;
if (rev->timedout) {
ngx_log_error(NGX_LOG_ERR, rev->log, NGX_ETIMEDOUT,
"mysql server %V timed out", m->peer.name);
ngx_mysql_close(m, NGX_ERROR);
return;
}
if (m->buf == NULL) {
m->peer.log->action = "reading mysql server greeting";
m->buf = ngx_create_temp_buf(m->pool, /* STUB */ 1024);
if (m->buf == NULL) {
ngx_mysql_close(m, NGX_ERROR);
return;
}
}
n = ngx_recv(m->peer.connection, m->buf->pos, /* STUB */ 1024);
if (n == NGX_AGAIN) {
return;
}
if (n < 5) {
ngx_mysql_close(m, NGX_ERROR);
return;
}
gr1 = (ngx_mysql_greeting1_pkt_t *) m->buf->pos;
if (ngx_m24toh(gr1->pktlen) > n - 4) {
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"mysql server %V sent incomplete greeting packet",
m->peer.name);
ngx_mysql_close(m, NGX_ERROR);
return;
}
if (gr1->protocol < 10) {
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"mysql server %V sent unsupported protocol version %ud",
m->peer.name, gr1->protocol);
ngx_mysql_close(m, NGX_ERROR);
return;
}
gr2 = (ngx_mysql_greeting2_pkt_t *)
(gr1->version + ngx_strlen(gr1->version) + 1);
capacity = ngx_m16toh(gr2->capacity);
ngx_log_debug8(NGX_LOG_DEBUG_MYSQL, rev->log, 0,
"mysql version: %ud, \"%s\", thread: %ud, salt: \"%s\", "
"capacity: %Xd, charset: %ud, status: %ud, salt rest \"%s\"",
gr1->protocol, gr1->version, ngx_m32toh(gr2->thread),
gr2->salt1, capacity, gr2->charset,
ngx_m16toh(gr2->status), &gr2->salt2);
capacity = NGX_MYSQL_LONG_PASSWORD
| NGX_MYSQL_CONNECT_WITH_DB
| NGX_MYSQL_PROTOCOL_41
| NGX_MYSQL_SECURE_CONNECTION;
len = 4 + 4 + 4 + 1 + 23 + m->login->len + 1 + 1 + m->database->len + 1;
if (m->passwd->len) {
len += 20;
}
auth = ngx_palloc(m->pool, len);
if (auth == NULL) {
ngx_mysql_close(m, NGX_ERROR);
return;
}
ngx_htom24(auth->pktlen, len - 4);
auth->pktn = (u_char) (gr1->pktn + 1);
ngx_htom32(auth->capacity, capacity);
ngx_htom32(auth->max_packet, 0x01000000); /* max packet size 2^24 */
ngx_memzero(auth->zero, 24);
auth->charset = gr2->charset;
p = ngx_copy(auth->login, m->login->data, m->login->len);
*p++ = '\0';
if (m->passwd->len) {
*p++ = (u_char) 20;
SHA1_Init(&sha);
SHA1_Update(&sha, m->passwd->data, m->passwd->len);
SHA1_Final(hash1, &sha);
SHA1_Init(&sha);
SHA1_Update(&sha, hash1, 20);
SHA1_Final(hash2, &sha);
SHA1_Init(&sha);
SHA1_Update(&sha, gr2->salt1, 8);
SHA1_Update(&sha, gr2->salt2, 12);
SHA1_Update(&sha, hash2, 20);
SHA1_Final(hash2, &sha);
for (i = 0; i < 20; i++) {
*p++ = (u_char) (hash1[i] ^ hash2[i]);
}
} else {
*p++ = '\0';
}
p = ngx_copy(p, m->database->data, m->database->len);
*p = '\0';
n = ngx_send(m->peer.connection, (void *) auth, len);
if (n < (ssize_t) len) {
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"the incomplete packet was sent to mysql server %V",
m->peer.name);
ngx_mysql_close(m, NGX_ERROR);
return;
}
m->peer.connection->read->handler = ngx_mysql_read_auth_result;
ngx_add_timer(m->peer.connection->read, /* STUB */ 5000);
}
static void
ngx_mysql_empty_handler(ngx_event_t *wev)
{
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0, "mysql empty handler");
return;
}
static void
ngx_mysql_read_auth_result(ngx_event_t *rev)
{
ssize_t n, len;
ngx_str_t msg;
ngx_mysql_t *m;
ngx_connection_t *c;
ngx_mysql_error_pkt_t *epkt;
ngx_mysql_response_pkt_t *pkt;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "mysql read auth");
c = rev->data;
m = c->data;
m->peer.log->action = "reading mysql auth result";
n = ngx_recv(m->peer.connection, m->buf->pos, /* STUB */ 1024);
if (n == NGX_AGAIN) {
return;
}
if (n < 5) {
ngx_mysql_close(m, NGX_ERROR);
return;
}
pkt = (ngx_mysql_response_pkt_t *) m->buf->pos;
len = ngx_m24toh(pkt->pktlen);
if (len > n - 4) {
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"mysql server %V sent incomplete response packet",
m->peer.name);
ngx_mysql_close(m, NGX_ERROR);
return;
}
if (pkt->fields == 0) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "mysql auth OK");
m->state = NGX_OK;
m->pktn = 0;
m->handler(m);
return;
}
epkt = (ngx_mysql_error_pkt_t *) pkt;
msg.len = (u_char *) epkt + 4 + len - epkt->message;
msg.data = epkt->message;
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"mysql server %V sent error (%ud): \"%V\"",
m->peer.name, ngx_m16toh(epkt->code), &msg);
ngx_mysql_close(m, NGX_ERROR);
}
ngx_int_t
ngx_mysql_query(ngx_mysql_t *m)
{
ssize_t n;
ngx_mysql_command_pkt_t *pkt;
pkt = (ngx_mysql_command_pkt_t *) m->query.data;
ngx_htom24(pkt->pktlen, m->query.len - 4);
pkt->pktn = (u_char) m->pktn++;
pkt->command = NGX_MYSQL_CMD_QUERY;
n = ngx_send(m->peer.connection, m->query.data, m->query.len);
if (n < (ssize_t) m->query.len) {
ngx_log_error(NGX_LOG_ERR, m->peer.log, 0,
"the incomplete packet was sent to mysql server %V",
m->peer.name);
ngx_mysql_close(m, NGX_ERROR);
return NGX_OK;
}
m->peer.connection->read->handler = ngx_mysql_read_query_result;
ngx_add_timer(m->peer.connection->read, /* STUB */ 5000);
/* STUB handle event */
return NGX_OK;
}
static void
ngx_mysql_read_query_result(ngx_event_t *rev)
{
ssize_t n, len;
ngx_str_t msg;
ngx_mysql_t *m;
ngx_connection_t *c;
ngx_mysql_error_pkt_t *epkt;
ngx_mysql_response_pkt_t *pkt;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "mysql read query result");
c = rev->data;
m = c->data;
m->peer.log->action = "reading mysql read query result";
n = ngx_recv(m->peer.connection, m->buf->pos, /* STUB */ 1024);
if (n == NGX_AGAIN) {
return;
}
if (n < 5) {
ngx_mysql_close(m, NGX_ERROR);
return;
}
pkt = (ngx_mysql_response_pkt_t *) m->buf->pos;
len = ngx_m24toh(pkt->pktlen);
if (len > n - 4) {
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"mysql server %V sent incomplete response packet",
m->peer.name);
ngx_mysql_close(m, NGX_ERROR);
return;
}
if (pkt->fields != 0xff) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "mysql query OK");
m->state = NGX_OK;
m->pktn = pkt->pktn;
m->handler(m);
return;
}
epkt = (ngx_mysql_error_pkt_t *) pkt;
msg.len = (u_char *) epkt + 4 + len - epkt->message;
msg.data = epkt->message;
ngx_log_error(NGX_LOG_ERR, rev->log, 0,
"mysql server %V sent error (%ud): \"%V\"",
m->peer.name, ngx_m16toh(epkt->code), &msg);
ngx_mysql_close(m, NGX_ERROR);
}
static void
ngx_mysql_close(ngx_mysql_t *m, ngx_int_t rc)
{
if (rc == NGX_ERROR) {
ngx_close_connection(m->peer.connection);
}
m->state = rc;
m->handler(m);
}
|