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ngx_http_upstream_check_handler.c
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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include "ngx_http_upstream_check_handler.h"
/* ngx_spinlock is defined without a matching unlock primitive */
#define ngx_spinlock_unlock(lock) \
(void) ngx_atomic_cmp_set(lock, ngx_pid, 0)
static void ngx_http_check_begin_handler(ngx_event_t *event);
static void ngx_http_check_connect_handler(ngx_event_t *event);
static void ngx_http_check_peek_handler(ngx_event_t *event);
static void ngx_http_check_send_handler(ngx_event_t *event);
static void ngx_http_check_recv_handler(ngx_event_t *event);
static ngx_int_t ngx_http_check_http_init(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_http_parse(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_parse_status_line(ngx_http_check_ctx *ctx,
ngx_buf_t *b, ngx_http_status_t *status);
static void ngx_http_check_http_reinit(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_ssl_hello_init(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_ssl_hello_parse(ngx_http_check_peer_t *peer);
static void ngx_http_check_ssl_hello_reinit(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_mysql_init(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_mysql_parse(ngx_http_check_peer_t *peer);
static void ngx_http_check_mysql_reinit(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_ajp_init(ngx_http_check_peer_t *peer);
static ngx_int_t ngx_http_check_ajp_parse(ngx_http_check_peer_t *peer);
static void ngx_http_check_ajp_reinit(ngx_http_check_peer_t *peer);
static void ngx_http_check_status_update(ngx_http_check_peer_t *peer,
ngx_int_t result);
static void ngx_http_check_clean_event(ngx_http_check_peer_t *peer);
static void ngx_http_check_timeout_handler(ngx_event_t *event);
static void ngx_http_check_finish_handler(ngx_event_t *event);
static ngx_int_t ngx_http_check_need_exit();
static void ngx_http_check_clear_all_events();
#define SHM_NAME_LEN 256
static ngx_int_t ngx_http_check_get_shm_name(ngx_str_t *shm_name,
ngx_pool_t *pool, ngx_uint_t generation);
static ngx_shm_zone_t * ngx_shared_memory_find(ngx_cycle_t *cycle,
ngx_str_t *name, void *tag);
static ngx_http_check_peer_shm_t * ngx_http_check_find_shm_peer(
ngx_http_check_peers_shm_t *peers_shm, ngx_addr_t *addr);
static void ngx_http_check_set_shm_peer(ngx_http_check_peer_shm_t *peer_shm,
ngx_http_check_peer_shm_t *opeer_shm, ngx_uint_t init_down);
static ngx_int_t ngx_http_upstream_check_init_shm_zone(
ngx_shm_zone_t *shm_zone, void *data);
#define RANDOM "NGX_HTTP_CHECK_SSL_HELLO\n\n\n\n"
/* This is the SSLv3 CLIENT HELLO packet used in conjunction with the
* check type of ssl_hello to ensure that the remote server speaks SSL.
*
* Check RFC 2246 (TLSv1.0) sections A.3 and A.4 for details.
*
* Some codes copied from HAProxy 1.4.1
*/
static const char sslv3_client_hello_pkt[] = {
"\x16" /* ContentType : 0x16 = Hanshake */
"\x03\x00" /* ProtocolVersion : 0x0300 = SSLv3 */
"\x00\x79" /* ContentLength : 0x79 bytes after this one */
"\x01" /* HanshakeType : 0x01 = CLIENT HELLO */
"\x00\x00\x75" /* HandshakeLength : 0x75 bytes after this one */
"\x03\x00" /* Hello Version : 0x0300 = v3 */
"\x00\x00\x00\x00" /* Unix GMT Time (s) : filled with <now> (@0x0B) */
RANDOM /* Random : must be exactly 28 bytes */
"\x00" /* Session ID length : empty (no session ID) */
"\x00\x4E" /* Cipher Suite Length : 78 bytes after this one */
"\x00\x01" "\x00\x02" "\x00\x03" "\x00\x04" /* 39 most common ciphers : */
"\x00\x05" "\x00\x06" "\x00\x07" "\x00\x08" /* 0x01...0x1B, 0x2F...0x3A */
"\x00\x09" "\x00\x0A" "\x00\x0B" "\x00\x0C" /* This covers RSA/DH, */
"\x00\x0D" "\x00\x0E" "\x00\x0F" "\x00\x10" /* various bit lengths, */
"\x00\x11" "\x00\x12" "\x00\x13" "\x00\x14" /* SHA1/MD5, DES/3DES/AES... */
"\x00\x15" "\x00\x16" "\x00\x17" "\x00\x18"
"\x00\x19" "\x00\x1A" "\x00\x1B" "\x00\x2F"
"\x00\x30" "\x00\x31" "\x00\x32" "\x00\x33"
"\x00\x34" "\x00\x35" "\x00\x36" "\x00\x37"
"\x00\x38" "\x00\x39" "\x00\x3A"
"\x01" /* Compression Length : 0x01 = 1 byte for types */
"\x00" /* Compression Type : 0x00 = NULL compression */
};
#define HANDSHAKE 0x16
#define SERVER_HELLO 0x02
#define AJP_CPING 0x0a
#define AJP_CPONG 0x09
static const char ajp_cping_packet[] ={0x12, 0x34, 0x00, 0x01, AJP_CPING, 0x00};
static const char ajp_cpong_packet[] ={0x41, 0x42, 0x00, 0x01, AJP_CPONG};
check_conf_t ngx_check_types[] = {
{ NGX_HTTP_CHECK_TCP,
"tcp",
ngx_null_string,
0,
ngx_http_check_peek_handler,
ngx_http_check_peek_handler,
NULL,
NULL,
NULL,
0 },
{ NGX_HTTP_CHECK_HTTP,
"http",
ngx_string("GET / HTTP/1.0\r\n\r\n"),
NGX_CONF_BITMASK_SET | NGX_CHECK_HTTP_2XX | NGX_CHECK_HTTP_3XX,
ngx_http_check_send_handler,
ngx_http_check_recv_handler,
/*TODO: unite the init function*/
ngx_http_check_http_init,
ngx_http_check_http_parse,
/*TODO: remove the reinit function*/
ngx_http_check_http_reinit,
1 },
{ NGX_HTTP_CHECK_SSL_HELLO,
"ssl_hello",
ngx_string(sslv3_client_hello_pkt),
0,
ngx_http_check_send_handler,
ngx_http_check_recv_handler,
ngx_http_check_ssl_hello_init,
ngx_http_check_ssl_hello_parse,
ngx_http_check_ssl_hello_reinit,
1 },
{ NGX_HTTP_CHECK_MYSQL,
"mysql",
ngx_null_string,
0,
ngx_http_check_send_handler,
ngx_http_check_recv_handler,
ngx_http_check_mysql_init,
ngx_http_check_mysql_parse,
ngx_http_check_mysql_reinit,
1 },
{ NGX_HTTP_CHECK_AJP,
"ajp",
ngx_string(ajp_cping_packet),
0,
ngx_http_check_send_handler,
ngx_http_check_recv_handler,
ngx_http_check_ajp_init,
ngx_http_check_ajp_parse,
ngx_http_check_ajp_reinit,
1 },
{ 0, "", ngx_null_string, 0, NULL, NULL, NULL, NULL, NULL, 0 }
};
static ngx_uint_t ngx_http_check_shm_generation = 0;
static ngx_http_check_peers_t *check_peers_ctx = NULL;
ngx_uint_t
ngx_http_check_peer_down(ngx_uint_t index)
{
ngx_http_check_peer_t *peer;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return 0;
}
peer = check_peers_ctx->peers.elts;
return (peer[index].shm->down);
}
void
ngx_http_check_get_peer(ngx_uint_t index)
{
ngx_http_check_peer_t *peer;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return;
}
peer = check_peers_ctx->peers.elts;
ngx_spinlock(&peer[index].shm->lock, ngx_pid, 1024);
peer[index].shm->busyness++;
peer[index].shm->access_count++;
ngx_spinlock_unlock(&peer[index].shm->lock);
}
void
ngx_http_check_free_peer(ngx_uint_t index)
{
ngx_http_check_peer_t *peer;
if (check_peers_ctx == NULL || index >= check_peers_ctx->peers.nelts) {
return;
}
peer = check_peers_ctx->peers.elts;
ngx_spinlock(&peer[index].shm->lock, ngx_pid, 1024);
if (peer[index].shm->busyness > 0) {
peer[index].shm->busyness--;
}
ngx_spinlock_unlock(&peer[index].shm->lock);
}
ngx_int_t
ngx_http_check_add_timers(ngx_cycle_t *cycle)
{
ngx_uint_t i;
ngx_msec_t t, delay;
check_conf_t *cf;
ngx_http_check_peer_t *peer;
ngx_http_check_peers_t *peers;
ngx_http_check_peer_shm_t *peer_shm;
ngx_http_check_peers_shm_t *peers_shm;
ngx_http_upstream_check_srv_conf_t *ucscf;
peers = check_peers_ctx;
if (peers == NULL) {
return NGX_OK;
}
peers_shm = peers->peers_shm;
if (peers_shm == NULL) {
return NGX_OK;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, cycle->log, 0,
"http check upstream init_process, shm_name: %V, "
"peer number: %ud",
&peers->check_shm_name,
peers->peers.nelts);
srandom(ngx_pid);
peer = peers->peers.elts;
peer_shm = peers_shm->peers;
for (i = 0; i < peers->peers.nelts; i++) {
peer[i].shm = &peer_shm[i];
peer[i].check_ev.handler = ngx_http_check_begin_handler;
peer[i].check_ev.log = cycle->log;
peer[i].check_ev.data = &peer[i];
peer[i].check_ev.timer_set = 0;
peer[i].check_timeout_ev.handler = ngx_http_check_timeout_handler;
peer[i].check_timeout_ev.log = cycle->log;
peer[i].check_timeout_ev.data = &peer[i];
peer[i].check_timeout_ev.timer_set = 0;
ucscf = peer[i].conf;
cf = ucscf->check_type_conf;
if (cf->need_pool) {
peer[i].pool = ngx_create_pool(ngx_pagesize, cycle->log);
if (peer[i].pool == NULL) {
return NGX_ERROR;
}
}
peer[i].send_handler = cf->send_handler;
peer[i].recv_handler = cf->recv_handler;
peer[i].init = cf->init;
peer[i].parse = cf->parse;
peer[i].reinit = cf->reinit;
/*
* I added a random start time. I don't want to trigger the check
* event too close at the beginning.
* */
delay = ucscf->check_interval > 1000 ? ucscf->check_interval : 1000;
t = ngx_random() % delay;
ngx_add_timer(&peer[i].check_ev, t);
}
return NGX_OK;
}
static void
ngx_http_check_begin_handler(ngx_event_t *event)
{
ngx_msec_t interval;
ngx_http_check_peer_t *peer;
ngx_http_check_peers_t *peers;
ngx_http_check_peers_shm_t *peers_shm;
ngx_http_upstream_check_srv_conf_t *ucscf;
if (ngx_http_check_need_exit()) {
return;
}
peers = check_peers_ctx;
if (peers == NULL) {
return;
}
peers_shm = peers->peers_shm;
if (peers_shm == NULL) {
return;
}
peer = event->data;
ucscf = peer->conf;
ngx_add_timer(event, ucscf->check_interval/2);
/* This process is processing this peer now. */
if ((peer->shm->owner == ngx_pid) ||
(peer->pc.connection != NULL) ||
(peer->check_timeout_ev.timer_set)) {
return;
}
interval = ngx_current_msec - peer->shm->access_time;
ngx_log_debug5(NGX_LOG_DEBUG_HTTP, event->log, 0,
"http check begin handler index: %ud, owner: %P, "
"ngx_pid: %P, interval: %M, check_interval: %M",
peer->index, peer->shm->owner,
ngx_pid, interval,
ucscf->check_interval);
ngx_spinlock(&peer->shm->lock, ngx_pid, 1024);
if (peers_shm->generation != ngx_http_check_shm_generation) {
ngx_spinlock_unlock(&peer->shm->lock);
return;
}
if ((interval >= ucscf->check_interval)
&& peer->shm->owner == NGX_INVALID_PID)
{
peer->shm->owner = ngx_pid;
}
else if (interval >= (ucscf->check_interval << 4)) {
/* If the check peer has been untouched for 4 times of
* the check interval, activates current timer.
* The checking process may be disappeared
* in some circumstance, and the clean event will never
* be triggered. */
peer->shm->owner = ngx_pid;
peer->shm->access_time = ngx_current_msec;
}
ngx_spinlock_unlock(&peer->shm->lock);
if (peer->shm->owner == ngx_pid) {
ngx_http_check_connect_handler(event);
}
}
static void
ngx_http_check_connect_handler(ngx_event_t *event)
{
ngx_int_t rc;
ngx_connection_t *c;
ngx_http_check_peer_t *peer;
ngx_http_upstream_check_srv_conf_t *ucscf;
if (ngx_http_check_need_exit()) {
return;
}
peer = event->data;
ucscf = peer->conf;
ngx_memzero(&peer->pc, sizeof(ngx_peer_connection_t));
peer->pc.sockaddr = peer->peer_addr->sockaddr;
peer->pc.socklen = peer->peer_addr->socklen;
peer->pc.name = &peer->peer_addr->name;
peer->pc.get = ngx_event_get_peer;
peer->pc.log = event->log;
peer->pc.log_error = NGX_ERROR_ERR;
peer->pc.cached = 0;
peer->pc.connection = NULL;
rc = ngx_event_connect_peer(&peer->pc);
if (rc == NGX_ERROR || rc == NGX_DECLINED) {
ngx_http_check_status_update(peer, 0);
return;
}
/* NGX_OK or NGX_AGAIN */
c = peer->pc.connection;
c->data = peer;
c->log = peer->pc.log;
c->sendfile = 0;
c->read->log = c->log;
c->write->log = c->log;
c->pool = peer->pool;
peer->state = NGX_HTTP_CHECK_CONNECT_DONE;
c->write->handler = peer->send_handler;
c->read->handler = peer->recv_handler;
ngx_add_timer(&peer->check_timeout_ev, ucscf->check_timeout);
if (rc == NGX_OK) {
c->write->handler(c->write);
}
}
static void
ngx_http_check_peek_handler(ngx_event_t *event)
{
char buf[1];
ngx_int_t n;
ngx_err_t err;
ngx_connection_t *c;
ngx_http_check_peer_t *peer;
if (ngx_http_check_need_exit()) {
return;
}
c = event->data;
peer = c->data;
n = recv(c->fd, buf, 1, MSG_PEEK);
err = ngx_socket_errno;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, err,
"http check upstream recv(): %i, fd: %d",
n, c->fd);
if (n >= 0 || err == NGX_EAGAIN) {
ngx_http_check_status_update(peer, 1);
} else {
c->error = 1;
ngx_http_check_status_update(peer, 0);
}
ngx_http_check_clean_event(peer);
ngx_http_check_finish_handler(event);
}
static void
ngx_http_check_send_handler(ngx_event_t *event)
{
ssize_t size;
ngx_connection_t *c;
ngx_http_check_ctx *ctx;
ngx_http_check_peer_t *peer;
if (ngx_http_check_need_exit()) {
return;
}
c = event->data;
peer = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http check send.");
if (c->pool == NULL) {
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check pool NULL with peer: %V ", &peer->peer_addr->name);
goto check_send_fail;
}
if (peer->state != NGX_HTTP_CHECK_CONNECT_DONE) {
if (ngx_handle_write_event(c->write, 0) != NGX_OK) {
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check handle write event error with peer: %V ",
&peer->peer_addr->name);
goto check_send_fail;
}
return;
}
if (peer->check_data == NULL) {
peer->check_data = ngx_pcalloc(peer->pool, sizeof(ngx_http_check_ctx));
if (peer->check_data == NULL) {
goto check_send_fail;
}
if (peer->init == NULL || peer->init(peer) != NGX_OK) {
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check init error with peer: %V ",
&peer->peer_addr->name);
goto check_send_fail;
}
}
ctx = peer->check_data;
while (ctx->send.pos < ctx->send.last) {
size = c->send(c, ctx->send.pos, ctx->send.last - ctx->send.pos);
#if (NGX_DEBUG)
ngx_err_t err;
err = (size >= 0) ? 0 : ngx_socket_errno;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, err,
"http check send size: %z, total: %z",
size, ctx->send.last - ctx->send.pos);
#endif
if (size > 0) {
ctx->send.pos += size;
} else if (size == 0 || size == NGX_AGAIN) {
return;
} else {
c->error = 1;
goto check_send_fail;
}
}
if (ctx->send.pos == ctx->send.last) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http check send done.");
peer->state = NGX_HTTP_CHECK_SEND_DONE;
}
return;
check_send_fail:
ngx_http_check_status_update(peer, 0);
ngx_http_check_clean_event(peer);
return;
}
static void
ngx_http_check_recv_handler(ngx_event_t *event)
{
u_char *new_buf;
ssize_t size, n;
ngx_int_t rc;
ngx_connection_t *c;
ngx_http_check_ctx *ctx;
ngx_http_check_peer_t *peer;
if (ngx_http_check_need_exit()) {
return;
}
c = event->data;
peer = c->data;
if (peer->state != NGX_HTTP_CHECK_SEND_DONE) {
if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
goto check_recv_fail;
}
return;
}
ctx = peer->check_data;
if (ctx->recv.start == NULL) {
/* 2048, is it enough? */
ctx->recv.start = ngx_palloc(c->pool, ngx_pagesize/2);
if (ctx->recv.start == NULL) {
goto check_recv_fail;
}
ctx->recv.last = ctx->recv.pos = ctx->recv.start;
ctx->recv.end = ctx->recv.start + ngx_pagesize/2;
}
while (1) {
n = ctx->recv.end - ctx->recv.last;
/* Not enough buffer? Enlarge twice */
if (n == 0) {
size = ctx->recv.end - ctx->recv.start;
new_buf = ngx_palloc(c->pool, size * 2);
if (new_buf == NULL) {
goto check_recv_fail;
}
ngx_memcpy(new_buf, ctx->recv.start, size);
ctx->recv.pos = ctx->recv.start = new_buf;
ctx->recv.last = new_buf + size;
ctx->recv.end = new_buf + size * 2;
n = ctx->recv.end - ctx->recv.last;
}
size = c->recv(c, ctx->recv.last, n);
#if (NGX_DEBUG)
ngx_err_t err;
err = (size >= 0) ? 0 : ngx_socket_errno;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, err,
"http check recv size: %z, peer: %V",
size, &peer->peer_addr->name);
#endif
if (size > 0) {
ctx->recv.last += size;
continue;
} else if (size == 0 || size == NGX_AGAIN) {
break;
}
else {
c->error = 1;
goto check_recv_fail;
}
}
rc = peer->parse(peer);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http check parse rc: %i, peer: %V",
rc, &peer->peer_addr->name);
switch (rc) {
case NGX_AGAIN:
/* The peer has closed its half side of the connection. */
if (size == 0) {
ngx_http_check_status_update(peer, 0);
break;
}
return;
case NGX_ERROR:
ngx_log_error(NGX_LOG_ERR, event->log, 0,
"check protocol %s error with peer: %V ",
peer->conf->check_type_conf->name,
&peer->peer_addr->name);
ngx_http_check_status_update(peer, 0);
break;
case NGX_OK:
default:
ngx_http_check_status_update(peer, 1);
}
peer->state = NGX_HTTP_CHECK_RECV_DONE;
ngx_http_check_clean_event(peer);
return;
check_recv_fail:
ngx_http_check_status_update(peer, 0);
ngx_http_check_clean_event(peer);
return;
}
static ngx_int_t
ngx_http_check_http_init(ngx_http_check_peer_t *peer)
{
ngx_http_check_ctx *ctx;
ngx_http_upstream_check_srv_conf_t *ucscf;
ctx = peer->check_data;
ucscf = peer->conf;
ctx->send.start = ctx->send.pos = (u_char *)ucscf->send.data;
ctx->send.end = ctx->send.last = ctx->send.start + ucscf->send.len;
ctx->recv.start = ctx->recv.pos = NULL;
ctx->recv.end = ctx->recv.last = NULL;
ctx->state = 0;
ngx_memzero(&ctx->status, sizeof(ngx_http_status_t));
return NGX_OK;
}
static ngx_int_t
ngx_http_check_http_parse(ngx_http_check_peer_t *peer)
{
ngx_int_t rc, code, code_n;
ngx_http_check_ctx *ctx;
ngx_http_upstream_check_srv_conf_t *ucscf;
ucscf = peer->conf;
ctx = peer->check_data;
if ((ctx->recv.last - ctx->recv.pos) > 0) {
rc = ngx_http_check_parse_status_line(ctx, &ctx->recv, &ctx->status);
if (rc == NGX_AGAIN) {
return rc;
}
if (rc == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, ngx_cycle->log, 0,
"http parse error with peer: %V, recv data: %s",
&peer->peer_addr->name, ctx->recv.start);
return rc;
}
code = ctx->status.code;
if (code >= 200 && code < 300) {
code_n = NGX_CHECK_HTTP_2XX;
} else if (code >= 300 && code < 400) {
code_n = NGX_CHECK_HTTP_3XX;
} else if (code >= 400 && code < 500) {
code_n = NGX_CHECK_HTTP_4XX;
} else if (code >= 500 && code < 600) {
code_n = NGX_CHECK_HTTP_5XX;
} else {
code_n = NGX_CHECK_HTTP_ERR;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http_parse: code_n: %i, conf: %ui",
code_n, ucscf->code.status_alive);
if (code_n & ucscf->code.status_alive) {
return NGX_OK;
} else {
return NGX_ERROR;
}
} else {
return NGX_AGAIN;
}
return NGX_OK;
}
/* This function copied from ngx_http_parse.c */
static ngx_int_t
ngx_http_check_parse_status_line(ngx_http_check_ctx *ctx, ngx_buf_t *b,
ngx_http_status_t *status)
{
u_char ch;
u_char *p;
enum {
sw_start = 0,
sw_H,
sw_HT,
sw_HTT,
sw_HTTP,
sw_first_major_digit,
sw_major_digit,
sw_first_minor_digit,
sw_minor_digit,
sw_status,
sw_space_after_status,
sw_status_text,
sw_almost_done
} state;
state = ctx->state;
for (p = b->pos; p < b->last; p++) {
ch = *p;
switch (state) {
/* "HTTP/" */
case sw_start:
switch (ch) {
case 'H':
state = sw_H;
break;
default:
return NGX_ERROR;
}
break;
case sw_H:
switch (ch) {
case 'T':
state = sw_HT;
break;
default:
return NGX_ERROR;
}
break;
case sw_HT:
switch (ch) {
case 'T':
state = sw_HTT;
break;
default:
return NGX_ERROR;
}
break;
case sw_HTT:
switch (ch) {
case 'P':
state = sw_HTTP;
break;
default:
return NGX_ERROR;
}
break;
case sw_HTTP:
switch (ch) {
case '/':
state = sw_first_major_digit;
break;
default:
return NGX_ERROR;
}
break;
/* the first digit of major HTTP version */
case sw_first_major_digit:
if (ch < '1' || ch > '9') {
return NGX_ERROR;
}
state = sw_major_digit;
break;
/* the major HTTP version or dot */
case sw_major_digit:
if (ch == '.') {
state = sw_first_minor_digit;
break;
}
if (ch < '0' || ch > '9') {
return NGX_ERROR;
}
break;
/* the first digit of minor HTTP version */
case sw_first_minor_digit:
if (ch < '0' || ch > '9') {
return NGX_ERROR;
}
state = sw_minor_digit;
break;
/* the minor HTTP version or the end of the request line */
case sw_minor_digit:
if (ch == ' ') {
state = sw_status;
break;
}
if (ch < '0' || ch > '9') {
return NGX_ERROR;
}
break;
/* HTTP status code */
case sw_status:
if (ch == ' ') {
break;
}
if (ch < '0' || ch > '9') {
return NGX_ERROR;
}
status->code = status->code * 10 + ch - '0';
if (++status->count == 3) {
state = sw_space_after_status;
status->start = p - 2;
}
break;
/* space or end of line */
case sw_space_after_status:
switch (ch) {
case ' ':
state = sw_status_text;
break;
case '.': /* IIS may send 403.1, 403.2, etc */
state = sw_status_text;
break;
case CR:
state = sw_almost_done;
break;
case LF:
goto done;
default:
return NGX_ERROR;
}
break;
/* any text until end of line */
case sw_status_text:
switch (ch) {
case CR:
state = sw_almost_done;
break;
case LF:
goto done;
}
break;
/* end of status line */
case sw_almost_done:
status->end = p - 1;
switch (ch) {
case LF:
goto done;
default:
return NGX_ERROR;
}
}
}
b->pos = p;
ctx->state = state;
return NGX_AGAIN;
done:
b->pos = p + 1;
if (status->end == NULL) {
status->end = p;
}
ctx->state = sw_start;
return NGX_OK;
}
static void
ngx_http_check_http_reinit(ngx_http_check_peer_t *peer)
{
ngx_http_check_ctx *ctx;
ctx = peer->check_data;
ctx->send.pos = ctx->send.start;
ctx->send.last = ctx->send.end;
ctx->recv.pos = ctx->recv.last = ctx->recv.start;
ctx->state = 0;