/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_stream.h>
static void ngx_stream_log_session(ngx_stream_session_t *s);
static void ngx_stream_close_connection(ngx_connection_t *c);
static u_char *ngx_stream_log_error(ngx_log_t *log, u_char *buf, size_t len);
static void ngx_stream_proxy_protocol_handler(ngx_event_t *rev);
void
ngx_stream_init_connection(ngx_connection_t *c)
{
u_char text[NGX_SOCKADDR_STRLEN];
size_t len;
ngx_uint_t i;
ngx_time_t *tp;
ngx_event_t *rev;
struct sockaddr *sa;
ngx_stream_port_t *port;
struct sockaddr_in *sin;
ngx_stream_in_addr_t *addr;
ngx_stream_session_t *s;
ngx_stream_conf_ctx_t *ctx;
ngx_stream_addr_conf_t *addr_conf;
#if (NGX_HAVE_INET6)
struct sockaddr_in6 *sin6;
ngx_stream_in6_addr_t *addr6;
#endif
ngx_stream_core_srv_conf_t *cscf;
ngx_stream_core_main_conf_t *cmcf;
/* find the server configuration for the address:port */
port = c->listening->servers;
if (port->naddrs > 1) {
/*
* There are several addresses on this port and one of them
* is the "*:port" wildcard so getsockname() is needed to determine
* the server address.
*
* AcceptEx() and recvmsg() already gave this address.
*/
if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) {
ngx_stream_close_connection(c);
return;
}
sa = c->local_sockaddr;
switch (sa->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
sin6 = (struct sockaddr_in6 *) sa;
addr6 = port->addrs;
/* the last address is "*" */
for (i = 0; i < port->naddrs - 1; i++) {
if (ngx_memcmp(&addr6[i].addr6, &sin6->sin6_addr, 16) == 0) {
break;
}
}
addr_conf = &addr6[i].conf;
break;
#endif
default: /* AF_INET */
sin = (struct sockaddr_in *) sa;
addr = port->addrs;
/* the last address is "*" */
for (i = 0; i < port->naddrs - 1; i++) {
if (addr[i].addr == sin->sin_addr.s_addr) {
break;
}
}
addr_conf = &addr[i].conf;
break;
}
} else {
switch (c->local_sockaddr->sa_family) {
#if (NGX_HAVE_INET6)
case AF_INET6:
addr6 = port->addrs;
addr_conf = &addr6[0].conf;
break;
#endif
default: /* AF_INET */
addr = port->addrs;
addr_conf = &addr[0].conf;
break;
}
}
s = ngx_pcalloc(c->pool, sizeof(ngx_stream_session_t));
if (s == NULL) {
ngx_stream_close_connection(c);
return;
}
ctx = addr_conf->default_server->ctx;
s->signature = NGX_STREAM_MODULE;
s->main_conf = ctx->main_conf;
s->srv_conf = ctx->srv_conf;
s->virtual_names = addr_conf->virtual_names;
#if (NGX_STREAM_SSL)
s->ssl = addr_conf->ssl;
#endif
if (c->buffer) {
s->received += c->buffer->last - c->buffer->pos;
}
s->connection = c;
c->data = s;
cscf = ngx_stream_get_module_srv_conf(s, ngx_stream_core_module);
ngx_set_connection_log(c, cscf->error_log);
len = ngx_sock_ntop(c->sockaddr, c->socklen, text, NGX_SOCKADDR_STRLEN, 1);
ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%uA %sclient %*s connected to %V",
c->number, c->type == SOCK_DGRAM ? "udp " : "",
len, text, &c->listening->addr_text);
c->log->connection = c->number;
c->log->handler = ngx_stream_log_error;
c->log->data = s;
c->log->action = "initializing session";
c->log_error = NGX_ERROR_INFO;
s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_stream_max_module);
if (s->ctx == NULL) {
ngx_stream_close_connection(c);
return;
}
cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);
s->variables = ngx_pcalloc(s->connection->pool,
cmcf->variables.nelts
* sizeof(ngx_stream_variable_value_t));
if (s->variables == NULL) {
ngx_stream_close_connection(c);
return;
}
tp = ngx_timeofday();
s->start_sec = tp->sec;
s->start_msec = tp->msec;
rev = c->read;
rev->handler = ngx_stream_session_handler;
if (addr_conf->proxy_protocol) {
c->log->action = "reading PROXY protocol";
rev->handler = ngx_stream_proxy_protocol_handler;
if (!rev->ready) {
ngx_add_timer(rev, cscf->proxy_protocol_timeout);
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_stream_finalize_session(s,
NGX_STREAM_INTERNAL_SERVER_ERROR);
}
return;
}
}
if (ngx_use_accept_mutex) {
ngx_post_event(rev, &ngx_posted_events);
return;
}
rev->handler(rev);
}
static void
ngx_stream_proxy_protocol_handler(ngx_event_t *rev)
{
u_char *p, buf[NGX_PROXY_PROTOCOL_MAX_HEADER];
size_t size;
ssize_t n;
ngx_err_t err;
ngx_connection_t *c;
ngx_stream_session_t *s;
ngx_stream_core_srv_conf_t *cscf;
c = rev->data;
s = c->data;
ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0,
"stream PROXY protocol handler");
if (rev->timedout) {
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
ngx_stream_finalize_session(s, NGX_STREAM_OK);
return;
}
n = recv(c->fd, (char *) buf, sizeof(buf), MSG_PEEK);
err = ngx_socket_errno;
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0, "recv(): %z", n);
if (n == -1) {
if (err == NGX_EAGAIN) {
rev->ready = 0;
if (!rev->timer_set) {
cscf = ngx_stream_get_module_srv_conf(s,
ngx_stream_core_module);
ngx_add_timer(rev, cscf->proxy_protocol_timeout);
}
if (ngx_handle_read_event(rev, 0) != NGX_OK) {
ngx_stream_finalize_session(s,
NGX_STREAM_INTERNAL_SERVER_ERROR);
}
return;
}
ngx_connection_error(c, err, "recv() failed");
ngx_stream_finalize_session(s, NGX_STREAM_OK);
return;
}
if (rev->timer_set) {
ngx_del_timer(rev);
}
p = ngx_proxy_protocol_read(c, buf, buf + n);
if (p == NULL) {
ngx_stream_finalize_session(s, NGX_STREAM_BAD_REQUEST);
return;
}
size = p - buf;
if (c->recv(c, buf, size) != (ssize_t) size) {
ngx_stream_finalize_session(s, NGX_STREAM_INTERNAL_SERVER_ERROR);
return;
}
c->log->action = "initializing session";
ngx_stream_session_handler(rev);
}
void
ngx_stream_session_handler(ngx_event_t *rev)
{
ngx_connection_t *c;
ngx_stream_session_t *s;
c = rev->data;
s = c->data;
ngx_stream_core_run_phases(s);
}
void
ngx_stream_finalize_session(ngx_stream_session_t *s, ngx_uint_t rc)
{
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
"finalize stream session: %i", rc);
s->status = rc;
ngx_stream_log_session(s);
ngx_stream_close_connection(s->connection);
}
static void
ngx_stream_log_session(ngx_stream_session_t *s)
{
ngx_uint_t i, n;
ngx_stream_handler_pt *log_handler;
ngx_stream_core_main_conf_t *cmcf;
cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module);
log_handler = cmcf->phases[NGX_STREAM_LOG_PHASE].handlers.elts;
n = cmcf->phases[NGX_STREAM_LOG_PHASE].handlers.nelts;
for (i = 0; i < n; i++) {
log_handler[i](s);
}
}
static void
ngx_stream_close_connection(ngx_connection_t *c)
{
ngx_pool_t *pool;
ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0,
"close stream connection: %d", c->fd);
#if (NGX_STREAM_SSL)
if (c->ssl) {
if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
c->ssl->handler = ngx_stream_close_connection;
return;
}
}
#endif
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
pool = c->pool;
ngx_close_connection(c);
ngx_destroy_pool(pool);
}
static u_char *
ngx_stream_log_error(ngx_log_t *log, u_char *buf, size_t len)
{
u_char *p;
ngx_stream_session_t *s;
if (log->action) {
p = ngx_snprintf(buf, len, " while %s", log->action);
len -= p - buf;
buf = p;
}
s = log->data;
p = ngx_snprintf(buf, len, ", %sclient: %V, server: %V",
s->connection->type == SOCK_DGRAM ? "udp " : "",
&s->connection->addr_text,
&s->connection->listening->addr_text);
len -= p - buf;
buf = p;
if (s->log_handler) {
p = s->log_handler(log, buf, len);
}
return p;
}
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