mirror of
https://github.com/nginx/nginx.git
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1092 lines
30 KiB
C
1092 lines
30 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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#include <ngx_event_connect.h>
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#include <ngx_mail.h>
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typedef struct {
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ngx_flag_t enable;
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ngx_flag_t pass_error_message;
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ngx_flag_t xclient;
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size_t buffer_size;
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ngx_msec_t timeout;
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} ngx_mail_proxy_conf_t;
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static void ngx_mail_proxy_block_read(ngx_event_t *rev);
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static void ngx_mail_proxy_pop3_handler(ngx_event_t *rev);
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static void ngx_mail_proxy_imap_handler(ngx_event_t *rev);
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static void ngx_mail_proxy_smtp_handler(ngx_event_t *rev);
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static void ngx_mail_proxy_dummy_handler(ngx_event_t *ev);
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static ngx_int_t ngx_mail_proxy_read_response(ngx_mail_session_t *s,
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ngx_uint_t state);
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static void ngx_mail_proxy_handler(ngx_event_t *ev);
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static void ngx_mail_proxy_upstream_error(ngx_mail_session_t *s);
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static void ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s);
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static void ngx_mail_proxy_close_session(ngx_mail_session_t *s);
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static void *ngx_mail_proxy_create_conf(ngx_conf_t *cf);
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static char *ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent,
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void *child);
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static ngx_command_t ngx_mail_proxy_commands[] = {
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{ ngx_string("proxy"),
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NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_MAIL_SRV_CONF_OFFSET,
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offsetof(ngx_mail_proxy_conf_t, enable),
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NULL },
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{ ngx_string("proxy_buffer"),
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NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_size_slot,
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NGX_MAIL_SRV_CONF_OFFSET,
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offsetof(ngx_mail_proxy_conf_t, buffer_size),
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NULL },
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{ ngx_string("proxy_timeout"),
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NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_msec_slot,
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NGX_MAIL_SRV_CONF_OFFSET,
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offsetof(ngx_mail_proxy_conf_t, timeout),
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NULL },
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{ ngx_string("proxy_pass_error_message"),
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NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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ngx_conf_set_flag_slot,
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NGX_MAIL_SRV_CONF_OFFSET,
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offsetof(ngx_mail_proxy_conf_t, pass_error_message),
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NULL },
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{ ngx_string("xclient"),
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NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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ngx_conf_set_flag_slot,
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NGX_MAIL_SRV_CONF_OFFSET,
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offsetof(ngx_mail_proxy_conf_t, xclient),
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NULL },
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ngx_null_command
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};
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static ngx_mail_module_t ngx_mail_proxy_module_ctx = {
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NULL, /* protocol */
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NULL, /* create main configuration */
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NULL, /* init main configuration */
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ngx_mail_proxy_create_conf, /* create server configuration */
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ngx_mail_proxy_merge_conf /* merge server configuration */
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};
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ngx_module_t ngx_mail_proxy_module = {
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NGX_MODULE_V1,
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&ngx_mail_proxy_module_ctx, /* module context */
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ngx_mail_proxy_commands, /* module directives */
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NGX_MAIL_MODULE, /* module type */
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NULL, /* init master */
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NULL, /* init module */
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NULL, /* init process */
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NULL, /* init thread */
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NULL, /* exit thread */
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NULL, /* exit process */
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NULL, /* exit master */
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NGX_MODULE_V1_PADDING
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};
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static u_char smtp_auth_ok[] = "235 2.0.0 OK" CRLF;
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void
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ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_peer_addr_t *peer)
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{
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int keepalive;
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ngx_int_t rc;
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ngx_mail_proxy_ctx_t *p;
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ngx_mail_proxy_conf_t *pcf;
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ngx_mail_core_srv_conf_t *cscf;
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s->connection->log->action = "connecting to upstream";
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cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
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if (cscf->so_keepalive) {
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keepalive = 1;
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if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE,
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(const void *) &keepalive, sizeof(int))
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== -1)
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{
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ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno,
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"setsockopt(SO_KEEPALIVE) failed");
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}
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}
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p = ngx_pcalloc(s->connection->pool, sizeof(ngx_mail_proxy_ctx_t));
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if (p == NULL) {
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ngx_mail_session_internal_server_error(s);
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return;
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}
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s->proxy = p;
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p->upstream.sockaddr = peer->sockaddr;
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p->upstream.socklen = peer->socklen;
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p->upstream.name = &peer->name;
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p->upstream.get = ngx_event_get_peer;
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p->upstream.log = s->connection->log;
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p->upstream.log_error = NGX_ERROR_ERR;
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rc = ngx_event_connect_peer(&p->upstream);
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if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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ngx_add_timer(p->upstream.connection->read, cscf->timeout);
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p->upstream.connection->data = s;
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p->upstream.connection->pool = s->connection->pool;
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s->connection->read->handler = ngx_mail_proxy_block_read;
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p->upstream.connection->write->handler = ngx_mail_proxy_dummy_handler;
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pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
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pcf->buffer_size);
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if (s->proxy->buffer == NULL) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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s->out.len = 0;
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switch (s->protocol) {
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case NGX_MAIL_POP3_PROTOCOL:
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p->upstream.connection->read->handler = ngx_mail_proxy_pop3_handler;
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s->mail_state = ngx_pop3_start;
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break;
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case NGX_MAIL_IMAP_PROTOCOL:
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p->upstream.connection->read->handler = ngx_mail_proxy_imap_handler;
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s->mail_state = ngx_imap_start;
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break;
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default: /* NGX_MAIL_SMTP_PROTOCOL */
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p->upstream.connection->read->handler = ngx_mail_proxy_smtp_handler;
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s->mail_state = ngx_smtp_start;
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break;
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}
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}
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static void
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ngx_mail_proxy_block_read(ngx_event_t *rev)
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{
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ngx_connection_t *c;
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ngx_mail_session_t *s;
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy block read");
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if (ngx_handle_read_event(rev, 0) != NGX_OK) {
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c = rev->data;
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s = c->data;
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ngx_mail_proxy_close_session(s);
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}
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}
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static void
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ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
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{
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u_char *p;
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ngx_int_t rc;
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ngx_str_t line;
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ngx_connection_t *c;
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ngx_mail_session_t *s;
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ngx_mail_proxy_conf_t *pcf;
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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"mail proxy pop3 auth handler");
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c = rev->data;
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s = c->data;
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if (rev->timedout) {
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ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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"upstream timed out");
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c->timedout = 1;
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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rc = ngx_mail_proxy_read_response(s, 0);
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if (rc == NGX_AGAIN) {
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return;
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}
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if (rc == NGX_ERROR) {
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ngx_mail_proxy_upstream_error(s);
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return;
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}
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switch (s->mail_state) {
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case ngx_pop3_start:
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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s->connection->log->action = "sending user name to upstream";
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line.len = sizeof("USER ") - 1 + s->login.len + 2;
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line.data = ngx_pnalloc(c->pool, line.len);
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if (line.data == NULL) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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p = ngx_cpymem(line.data, "USER ", sizeof("USER ") - 1);
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p = ngx_cpymem(p, s->login.data, s->login.len);
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*p++ = CR; *p = LF;
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s->mail_state = ngx_pop3_user;
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break;
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case ngx_pop3_user:
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send pass");
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s->connection->log->action = "sending password to upstream";
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line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
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line.data = ngx_pnalloc(c->pool, line.len);
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if (line.data == NULL) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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p = ngx_cpymem(line.data, "PASS ", sizeof("PASS ") - 1);
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p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
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*p++ = CR; *p = LF;
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s->mail_state = ngx_pop3_passwd;
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break;
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case ngx_pop3_passwd:
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s->connection->read->handler = ngx_mail_proxy_handler;
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s->connection->write->handler = ngx_mail_proxy_handler;
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rev->handler = ngx_mail_proxy_handler;
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c->write->handler = ngx_mail_proxy_handler;
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pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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ngx_add_timer(s->connection->read, pcf->timeout);
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ngx_del_timer(c->read);
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c->log->action = NULL;
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ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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ngx_mail_proxy_handler(s->connection->write);
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return;
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default:
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#if (NGX_SUPPRESS_WARN)
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line.len = 0;
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line.data = NULL;
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#endif
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break;
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}
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if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
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/*
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* we treat the incomplete sending as NGX_ERROR
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* because it is very strange here
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*/
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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s->proxy->buffer->pos = s->proxy->buffer->start;
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s->proxy->buffer->last = s->proxy->buffer->start;
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}
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static void
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ngx_mail_proxy_imap_handler(ngx_event_t *rev)
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{
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u_char *p;
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ngx_int_t rc;
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ngx_str_t line;
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ngx_connection_t *c;
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ngx_mail_session_t *s;
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ngx_mail_proxy_conf_t *pcf;
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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"mail proxy imap auth handler");
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c = rev->data;
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s = c->data;
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if (rev->timedout) {
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ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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"upstream timed out");
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c->timedout = 1;
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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rc = ngx_mail_proxy_read_response(s, s->mail_state);
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if (rc == NGX_AGAIN) {
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return;
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}
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if (rc == NGX_ERROR) {
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ngx_mail_proxy_upstream_error(s);
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return;
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}
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switch (s->mail_state) {
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case ngx_imap_start:
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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"mail proxy send login");
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s->connection->log->action = "sending LOGIN command to upstream";
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line.len = s->tag.len + sizeof("LOGIN ") - 1
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+ 1 + NGX_SIZE_T_LEN + 1 + 2;
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line.data = ngx_pnalloc(c->pool, line.len);
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if (line.data == NULL) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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line.len = ngx_sprintf(line.data, "%VLOGIN {%uz}" CRLF,
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&s->tag, s->login.len)
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- line.data;
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s->mail_state = ngx_imap_login;
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break;
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case ngx_imap_login:
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
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s->connection->log->action = "sending user name to upstream";
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line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
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line.data = ngx_pnalloc(c->pool, line.len);
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if (line.data == NULL) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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line.len = ngx_sprintf(line.data, "%V {%uz}" CRLF,
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&s->login, s->passwd.len)
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- line.data;
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s->mail_state = ngx_imap_user;
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break;
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case ngx_imap_user:
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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"mail proxy send passwd");
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s->connection->log->action = "sending password to upstream";
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line.len = s->passwd.len + 2;
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line.data = ngx_pnalloc(c->pool, line.len);
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if (line.data == NULL) {
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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p = ngx_cpymem(line.data, s->passwd.data, s->passwd.len);
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*p++ = CR; *p = LF;
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s->mail_state = ngx_imap_passwd;
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break;
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case ngx_imap_passwd:
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s->connection->read->handler = ngx_mail_proxy_handler;
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s->connection->write->handler = ngx_mail_proxy_handler;
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rev->handler = ngx_mail_proxy_handler;
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c->write->handler = ngx_mail_proxy_handler;
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pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
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ngx_add_timer(s->connection->read, pcf->timeout);
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ngx_del_timer(c->read);
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c->log->action = NULL;
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ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
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ngx_mail_proxy_handler(s->connection->write);
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return;
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default:
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#if (NGX_SUPPRESS_WARN)
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line.len = 0;
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line.data = NULL;
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#endif
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break;
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}
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if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
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/*
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* we treat the incomplete sending as NGX_ERROR
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* because it is very strange here
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*/
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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s->proxy->buffer->pos = s->proxy->buffer->start;
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s->proxy->buffer->last = s->proxy->buffer->start;
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}
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static void
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ngx_mail_proxy_smtp_handler(ngx_event_t *rev)
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{
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u_char *p;
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ngx_int_t rc;
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ngx_str_t line;
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ngx_buf_t *b;
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ngx_connection_t *c;
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ngx_mail_session_t *s;
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ngx_mail_proxy_conf_t *pcf;
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ngx_mail_core_srv_conf_t *cscf;
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ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
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"mail proxy smtp auth handler");
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c = rev->data;
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s = c->data;
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if (rev->timedout) {
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ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
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"upstream timed out");
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c->timedout = 1;
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ngx_mail_proxy_internal_server_error(s);
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return;
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}
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rc = ngx_mail_proxy_read_response(s, s->mail_state);
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if (rc == NGX_AGAIN) {
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return;
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}
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if (rc == NGX_ERROR) {
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ngx_mail_proxy_upstream_error(s);
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return;
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}
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switch (s->mail_state) {
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|
case ngx_smtp_start:
|
|
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send ehlo");
|
|
|
|
s->connection->log->action = "sending HELO/EHLO to upstream";
|
|
|
|
cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
|
|
|
|
line.len = sizeof("HELO ") - 1 + cscf->server_name.len + 2;
|
|
line.data = ngx_pnalloc(c->pool, line.len);
|
|
if (line.data == NULL) {
|
|
ngx_mail_proxy_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
|
p = ngx_cpymem(line.data,
|
|
((s->esmtp || pcf->xclient) ? "EHLO " : "HELO "),
|
|
sizeof("HELO ") - 1);
|
|
|
|
p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
|
|
*p++ = CR; *p = LF;
|
|
|
|
if (pcf->xclient) {
|
|
s->mail_state = ngx_smtp_helo_xclient;
|
|
|
|
} else if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
s->mail_state = ngx_smtp_helo_from;
|
|
|
|
} else {
|
|
s->mail_state = ngx_smtp_helo;
|
|
}
|
|
|
|
break;
|
|
|
|
case ngx_smtp_helo_xclient:
|
|
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
"mail proxy send xclient");
|
|
|
|
s->connection->log->action = "sending XCLIENT to upstream";
|
|
|
|
line.len = sizeof("XCLIENT ADDR= LOGIN= NAME="
|
|
CRLF) - 1
|
|
+ s->connection->addr_text.len + s->login.len + s->host.len;
|
|
|
|
line.data = ngx_pnalloc(c->pool, line.len);
|
|
if (line.data == NULL) {
|
|
ngx_mail_proxy_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
line.len = ngx_sprintf(line.data,
|
|
"XCLIENT ADDR=%V%s%V NAME=%V" CRLF,
|
|
&s->connection->addr_text,
|
|
(s->login.len ? " LOGIN=" : ""), &s->login, &s->host)
|
|
- line.data;
|
|
|
|
if (s->smtp_helo.len) {
|
|
s->mail_state = ngx_smtp_xclient_helo;
|
|
|
|
} else if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
s->mail_state = ngx_smtp_xclient_from;
|
|
|
|
} else {
|
|
s->mail_state = ngx_smtp_xclient;
|
|
}
|
|
|
|
break;
|
|
|
|
case ngx_smtp_xclient_helo:
|
|
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
"mail proxy send client ehlo");
|
|
|
|
s->connection->log->action = "sending client HELO/EHLO to upstream";
|
|
|
|
line.len = sizeof("HELO " CRLF) - 1 + s->smtp_helo.len;
|
|
|
|
line.data = ngx_pnalloc(c->pool, line.len);
|
|
if (line.data == NULL) {
|
|
ngx_mail_proxy_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
line.len = ngx_sprintf(line.data,
|
|
((s->esmtp) ? "EHLO %V" CRLF : "HELO %V" CRLF),
|
|
&s->smtp_helo)
|
|
- line.data;
|
|
|
|
s->mail_state = (s->auth_method == NGX_MAIL_AUTH_NONE) ?
|
|
ngx_smtp_helo_from : ngx_smtp_helo;
|
|
|
|
break;
|
|
|
|
case ngx_smtp_helo_from:
|
|
case ngx_smtp_xclient_from:
|
|
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
"mail proxy send mail from");
|
|
|
|
s->connection->log->action = "sending MAIL FROM to upstream";
|
|
|
|
line.len = s->smtp_from.len + sizeof(CRLF) - 1;
|
|
line.data = ngx_pnalloc(c->pool, line.len);
|
|
if (line.data == NULL) {
|
|
ngx_mail_proxy_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
p = ngx_cpymem(line.data, s->smtp_from.data, s->smtp_from.len);
|
|
*p++ = CR; *p = LF;
|
|
|
|
s->mail_state = ngx_smtp_from;
|
|
|
|
break;
|
|
|
|
case ngx_smtp_from:
|
|
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
|
|
"mail proxy send rcpt to");
|
|
|
|
s->connection->log->action = "sending RCPT TO to upstream";
|
|
|
|
line.len = s->smtp_to.len + sizeof(CRLF) - 1;
|
|
line.data = ngx_pnalloc(c->pool, line.len);
|
|
if (line.data == NULL) {
|
|
ngx_mail_proxy_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
p = ngx_cpymem(line.data, s->smtp_to.data, s->smtp_to.len);
|
|
*p++ = CR; *p = LF;
|
|
|
|
s->mail_state = ngx_smtp_to;
|
|
|
|
break;
|
|
|
|
case ngx_smtp_helo:
|
|
case ngx_smtp_xclient:
|
|
case ngx_smtp_to:
|
|
|
|
b = s->proxy->buffer;
|
|
|
|
if (s->auth_method == NGX_MAIL_AUTH_NONE) {
|
|
b->pos = b->start;
|
|
|
|
} else {
|
|
ngx_memcpy(b->start, smtp_auth_ok, sizeof(smtp_auth_ok) - 1);
|
|
b->last = b->start + sizeof(smtp_auth_ok) - 1;
|
|
}
|
|
|
|
s->connection->read->handler = ngx_mail_proxy_handler;
|
|
s->connection->write->handler = ngx_mail_proxy_handler;
|
|
rev->handler = ngx_mail_proxy_handler;
|
|
c->write->handler = ngx_mail_proxy_handler;
|
|
|
|
pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
ngx_add_timer(s->connection->read, pcf->timeout);
|
|
ngx_del_timer(c->read);
|
|
|
|
c->log->action = NULL;
|
|
ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
|
|
|
|
ngx_mail_proxy_handler(s->connection->write);
|
|
|
|
return;
|
|
|
|
default:
|
|
#if (NGX_SUPPRESS_WARN)
|
|
line.len = 0;
|
|
line.data = NULL;
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
if (c->send(c, line.data, line.len) < (ssize_t) line.len) {
|
|
/*
|
|
* we treat the incomplete sending as NGX_ERROR
|
|
* because it is very strange here
|
|
*/
|
|
ngx_mail_proxy_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
s->proxy->buffer->pos = s->proxy->buffer->start;
|
|
s->proxy->buffer->last = s->proxy->buffer->start;
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_mail_proxy_dummy_handler(ngx_event_t *wev)
|
|
{
|
|
ngx_connection_t *c;
|
|
ngx_mail_session_t *s;
|
|
|
|
ngx_log_debug0(NGX_LOG_DEBUG_MAIL, wev->log, 0, "mail proxy dummy handler");
|
|
|
|
if (ngx_handle_write_event(wev, 0) != NGX_OK) {
|
|
c = wev->data;
|
|
s = c->data;
|
|
|
|
ngx_mail_proxy_close_session(s);
|
|
}
|
|
}
|
|
|
|
|
|
static ngx_int_t
|
|
ngx_mail_proxy_read_response(ngx_mail_session_t *s, ngx_uint_t state)
|
|
{
|
|
u_char *p;
|
|
ssize_t n;
|
|
ngx_buf_t *b;
|
|
ngx_mail_proxy_conf_t *pcf;
|
|
|
|
s->connection->log->action = "reading response from upstream";
|
|
|
|
b = s->proxy->buffer;
|
|
|
|
n = s->proxy->upstream.connection->recv(s->proxy->upstream.connection,
|
|
b->last, b->end - b->last);
|
|
|
|
if (n == NGX_ERROR || n == 0) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
if (n == NGX_AGAIN) {
|
|
return NGX_AGAIN;
|
|
}
|
|
|
|
b->last += n;
|
|
|
|
if (b->last - b->pos < 5) {
|
|
return NGX_AGAIN;
|
|
}
|
|
|
|
if (*(b->last - 2) != CR || *(b->last - 1) != LF) {
|
|
if (b->last == b->end) {
|
|
*(b->last - 1) = '\0';
|
|
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
"upstream sent too long response line: \"%s\"",
|
|
b->pos);
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
return NGX_AGAIN;
|
|
}
|
|
|
|
p = b->pos;
|
|
|
|
switch (s->protocol) {
|
|
|
|
case NGX_MAIL_POP3_PROTOCOL:
|
|
if (p[0] == '+' && p[1] == 'O' && p[2] == 'K') {
|
|
return NGX_OK;
|
|
}
|
|
break;
|
|
|
|
case NGX_MAIL_IMAP_PROTOCOL:
|
|
switch (state) {
|
|
|
|
case ngx_imap_start:
|
|
if (p[0] == '*' && p[1] == ' ' && p[2] == 'O' && p[3] == 'K') {
|
|
return NGX_OK;
|
|
}
|
|
break;
|
|
|
|
case ngx_imap_login:
|
|
case ngx_imap_user:
|
|
if (p[0] == '+') {
|
|
return NGX_OK;
|
|
}
|
|
break;
|
|
|
|
case ngx_imap_passwd:
|
|
if (ngx_strncmp(p, s->tag.data, s->tag.len) == 0) {
|
|
p += s->tag.len;
|
|
if (p[0] == 'O' && p[1] == 'K') {
|
|
return NGX_OK;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
break;
|
|
|
|
default: /* NGX_MAIL_SMTP_PROTOCOL */
|
|
switch (state) {
|
|
|
|
case ngx_smtp_start:
|
|
if (p[0] == '2' && p[1] == '2' && p[2] == '0') {
|
|
return NGX_OK;
|
|
}
|
|
break;
|
|
|
|
case ngx_smtp_helo:
|
|
case ngx_smtp_helo_xclient:
|
|
case ngx_smtp_helo_from:
|
|
case ngx_smtp_from:
|
|
if (p[0] == '2' && p[1] == '5' && p[2] == '0') {
|
|
return NGX_OK;
|
|
}
|
|
break;
|
|
|
|
case ngx_smtp_xclient:
|
|
case ngx_smtp_xclient_from:
|
|
case ngx_smtp_xclient_helo:
|
|
if (p[0] == '2' && (p[1] == '2' || p[1] == '5') && p[2] == '0') {
|
|
return NGX_OK;
|
|
}
|
|
break;
|
|
|
|
case ngx_smtp_to:
|
|
return NGX_OK;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
|
|
if (pcf->pass_error_message == 0) {
|
|
*(b->last - 2) = '\0';
|
|
ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
|
|
"upstream sent invalid response: \"%s\"", p);
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
s->out.len = b->last - p - 2;
|
|
s->out.data = p;
|
|
|
|
ngx_log_error(NGX_LOG_INFO, s->connection->log, 0,
|
|
"upstream sent invalid response: \"%V\"", &s->out);
|
|
|
|
s->out.len = b->last - b->pos;
|
|
s->out.data = b->pos;
|
|
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_mail_proxy_handler(ngx_event_t *ev)
|
|
{
|
|
char *action, *recv_action, *send_action;
|
|
size_t size;
|
|
ssize_t n;
|
|
ngx_buf_t *b;
|
|
ngx_uint_t do_write;
|
|
ngx_connection_t *c, *src, *dst;
|
|
ngx_mail_session_t *s;
|
|
ngx_mail_proxy_conf_t *pcf;
|
|
|
|
c = ev->data;
|
|
s = c->data;
|
|
|
|
if (ev->timedout) {
|
|
c->log->action = "proxying";
|
|
|
|
if (c == s->connection) {
|
|
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
"client timed out");
|
|
c->timedout = 1;
|
|
|
|
} else {
|
|
ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
|
|
"upstream timed out");
|
|
}
|
|
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (c == s->connection) {
|
|
if (ev->write) {
|
|
recv_action = "proxying and reading from upstream";
|
|
send_action = "proxying and sending to client";
|
|
src = s->proxy->upstream.connection;
|
|
dst = c;
|
|
b = s->proxy->buffer;
|
|
|
|
} else {
|
|
recv_action = "proxying and reading from client";
|
|
send_action = "proxying and sending to upstream";
|
|
src = c;
|
|
dst = s->proxy->upstream.connection;
|
|
b = s->buffer;
|
|
}
|
|
|
|
} else {
|
|
if (ev->write) {
|
|
recv_action = "proxying and reading from client";
|
|
send_action = "proxying and sending to upstream";
|
|
src = s->connection;
|
|
dst = c;
|
|
b = s->buffer;
|
|
|
|
} else {
|
|
recv_action = "proxying and reading from upstream";
|
|
send_action = "proxying and sending to client";
|
|
src = c;
|
|
dst = s->connection;
|
|
b = s->proxy->buffer;
|
|
}
|
|
}
|
|
|
|
do_write = ev->write ? 1 : 0;
|
|
|
|
ngx_log_debug3(NGX_LOG_DEBUG_MAIL, ev->log, 0,
|
|
"mail proxy handler: %d, #%d > #%d",
|
|
do_write, src->fd, dst->fd);
|
|
|
|
for ( ;; ) {
|
|
|
|
if (do_write) {
|
|
|
|
size = b->last - b->pos;
|
|
|
|
if (size && dst->write->ready) {
|
|
c->log->action = send_action;
|
|
|
|
n = dst->send(dst, b->pos, size);
|
|
|
|
if (n == NGX_ERROR) {
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (n > 0) {
|
|
b->pos += n;
|
|
|
|
if (b->pos == b->last) {
|
|
b->pos = b->start;
|
|
b->last = b->start;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
size = b->end - b->last;
|
|
|
|
if (size && src->read->ready) {
|
|
c->log->action = recv_action;
|
|
|
|
n = src->recv(src, b->last, size);
|
|
|
|
if (n == NGX_AGAIN || n == 0) {
|
|
break;
|
|
}
|
|
|
|
if (n > 0) {
|
|
do_write = 1;
|
|
b->last += n;
|
|
|
|
continue;
|
|
}
|
|
|
|
if (n == NGX_ERROR) {
|
|
src->read->eof = 1;
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
c->log->action = "proxying";
|
|
|
|
if ((s->connection->read->eof && s->buffer->pos == s->buffer->last)
|
|
|| (s->proxy->upstream.connection->read->eof
|
|
&& s->proxy->buffer->pos == s->proxy->buffer->last)
|
|
|| (s->connection->read->eof
|
|
&& s->proxy->upstream.connection->read->eof))
|
|
{
|
|
action = c->log->action;
|
|
c->log->action = NULL;
|
|
ngx_log_error(NGX_LOG_INFO, c->log, 0, "proxied session done");
|
|
c->log->action = action;
|
|
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (ngx_handle_write_event(dst->write, 0) != NGX_OK) {
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (ngx_handle_read_event(dst->read, 0) != NGX_OK) {
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (ngx_handle_write_event(src->write, 0) != NGX_OK) {
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (ngx_handle_read_event(src->read, 0) != NGX_OK) {
|
|
ngx_mail_proxy_close_session(s);
|
|
return;
|
|
}
|
|
|
|
if (c == s->connection) {
|
|
pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
|
|
ngx_add_timer(c->read, pcf->timeout);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_mail_proxy_upstream_error(ngx_mail_session_t *s)
|
|
{
|
|
if (s->proxy->upstream.connection) {
|
|
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
"close mail proxy connection: %d",
|
|
s->proxy->upstream.connection->fd);
|
|
|
|
ngx_close_connection(s->proxy->upstream.connection);
|
|
}
|
|
|
|
if (s->out.len == 0) {
|
|
ngx_mail_session_internal_server_error(s);
|
|
return;
|
|
}
|
|
|
|
s->quit = 1;
|
|
ngx_mail_send(s->connection->write);
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s)
|
|
{
|
|
if (s->proxy->upstream.connection) {
|
|
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
"close mail proxy connection: %d",
|
|
s->proxy->upstream.connection->fd);
|
|
|
|
ngx_close_connection(s->proxy->upstream.connection);
|
|
}
|
|
|
|
ngx_mail_session_internal_server_error(s);
|
|
}
|
|
|
|
|
|
static void
|
|
ngx_mail_proxy_close_session(ngx_mail_session_t *s)
|
|
{
|
|
if (s->proxy->upstream.connection) {
|
|
ngx_log_debug1(NGX_LOG_DEBUG_MAIL, s->connection->log, 0,
|
|
"close mail proxy connection: %d",
|
|
s->proxy->upstream.connection->fd);
|
|
|
|
ngx_close_connection(s->proxy->upstream.connection);
|
|
}
|
|
|
|
ngx_mail_close_connection(s->connection);
|
|
}
|
|
|
|
|
|
static void *
|
|
ngx_mail_proxy_create_conf(ngx_conf_t *cf)
|
|
{
|
|
ngx_mail_proxy_conf_t *pcf;
|
|
|
|
pcf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_proxy_conf_t));
|
|
if (pcf == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
pcf->enable = NGX_CONF_UNSET;
|
|
pcf->pass_error_message = NGX_CONF_UNSET;
|
|
pcf->xclient = NGX_CONF_UNSET;
|
|
pcf->buffer_size = NGX_CONF_UNSET_SIZE;
|
|
pcf->timeout = NGX_CONF_UNSET_MSEC;
|
|
|
|
return pcf;
|
|
}
|
|
|
|
|
|
static char *
|
|
ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
{
|
|
ngx_mail_proxy_conf_t *prev = parent;
|
|
ngx_mail_proxy_conf_t *conf = child;
|
|
|
|
ngx_conf_merge_value(conf->enable, prev->enable, 0);
|
|
ngx_conf_merge_value(conf->pass_error_message, prev->pass_error_message, 0);
|
|
ngx_conf_merge_value(conf->xclient, prev->xclient, 1);
|
|
ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
|
|
(size_t) ngx_pagesize);
|
|
ngx_conf_merge_msec_value(conf->timeout, prev->timeout, 24 * 60 * 60000);
|
|
|
|
return NGX_CONF_OK;
|
|
}
|