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-rw-r--r--app/nginx/src/mail/ngx_mail_proxy_module.c1123
1 files changed, 1123 insertions, 0 deletions
diff --git a/app/nginx/src/mail/ngx_mail_proxy_module.c b/app/nginx/src/mail/ngx_mail_proxy_module.c
new file mode 100644
index 0000000..007284b
--- /dev/null
+++ b/app/nginx/src/mail/ngx_mail_proxy_module.c
@@ -0,0 +1,1123 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_event_connect.h>
+#include <ngx_mail.h>
+
+
+typedef struct {
+ ngx_flag_t enable;
+ ngx_flag_t pass_error_message;
+ ngx_flag_t xclient;
+ size_t buffer_size;
+ ngx_msec_t timeout;
+} ngx_mail_proxy_conf_t;
+
+
+static void ngx_mail_proxy_block_read(ngx_event_t *rev);
+static void ngx_mail_proxy_pop3_handler(ngx_event_t *rev);
+static void ngx_mail_proxy_imap_handler(ngx_event_t *rev);
+static void ngx_mail_proxy_smtp_handler(ngx_event_t *rev);
+static void ngx_mail_proxy_dummy_handler(ngx_event_t *ev);
+static ngx_int_t ngx_mail_proxy_read_response(ngx_mail_session_t *s,
+ ngx_uint_t state);
+static void ngx_mail_proxy_handler(ngx_event_t *ev);
+static void ngx_mail_proxy_upstream_error(ngx_mail_session_t *s);
+static void ngx_mail_proxy_internal_server_error(ngx_mail_session_t *s);
+static void ngx_mail_proxy_close_session(ngx_mail_session_t *s);
+static void *ngx_mail_proxy_create_conf(ngx_conf_t *cf);
+static char *ngx_mail_proxy_merge_conf(ngx_conf_t *cf, void *parent,
+ void *child);
+
+
+static ngx_command_t ngx_mail_proxy_commands[] = {
+
+ { ngx_string("proxy"),
+ NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
+ ngx_conf_set_flag_slot,
+ NGX_MAIL_SRV_CONF_OFFSET,
+ offsetof(ngx_mail_proxy_conf_t, enable),
+ NULL },
+
+ { ngx_string("proxy_buffer"),
+ NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
+ ngx_conf_set_size_slot,
+ NGX_MAIL_SRV_CONF_OFFSET,
+ offsetof(ngx_mail_proxy_conf_t, buffer_size),
+ NULL },
+
+ { ngx_string("proxy_timeout"),
+ NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
+ ngx_conf_set_msec_slot,
+ NGX_MAIL_SRV_CONF_OFFSET,
+ offsetof(ngx_mail_proxy_conf_t, timeout),
+ NULL },
+
+ { ngx_string("proxy_pass_error_message"),
+ NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
+ ngx_conf_set_flag_slot,
+ NGX_MAIL_SRV_CONF_OFFSET,
+ offsetof(ngx_mail_proxy_conf_t, pass_error_message),
+ NULL },
+
+ { ngx_string("xclient"),
+ NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
+ ngx_conf_set_flag_slot,
+ NGX_MAIL_SRV_CONF_OFFSET,
+ offsetof(ngx_mail_proxy_conf_t, xclient),
+ NULL },
+
+ ngx_null_command
+};
+
+
+static ngx_mail_module_t ngx_mail_proxy_module_ctx = {
+ NULL, /* protocol */
+
+ NULL, /* create main configuration */
+ NULL, /* init main configuration */
+
+ ngx_mail_proxy_create_conf, /* create server configuration */
+ ngx_mail_proxy_merge_conf /* merge server configuration */
+};
+
+
+ngx_module_t ngx_mail_proxy_module = {
+ NGX_MODULE_V1,
+ &ngx_mail_proxy_module_ctx, /* module context */
+ ngx_mail_proxy_commands, /* module directives */
+ NGX_MAIL_MODULE, /* module type */
+ NULL, /* init master */
+ NULL, /* init module */
+ NULL, /* init process */
+ NULL, /* init thread */
+ NULL, /* exit thread */
+ NULL, /* exit process */
+ NULL, /* exit master */
+ NGX_MODULE_V1_PADDING
+};
+
+
+static u_char smtp_auth_ok[] = "235 2.0.0 OK" CRLF;
+
+
+void
+ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_addr_t *peer)
+{
+ ngx_int_t rc;
+ ngx_mail_proxy_ctx_t *p;
+ ngx_mail_proxy_conf_t *pcf;
+ ngx_mail_core_srv_conf_t *cscf;
+
+ s->connection->log->action = "connecting to upstream";
+
+ cscf = ngx_mail_get_module_srv_conf(s, ngx_mail_core_module);
+
+ p = ngx_pcalloc(s->connection->pool, sizeof(ngx_mail_proxy_ctx_t));
+ if (p == NULL) {
+ ngx_mail_session_internal_server_error(s);
+ return;
+ }
+
+ s->proxy = p;
+
+ p->upstream.sockaddr = peer->sockaddr;
+ p->upstream.socklen = peer->socklen;
+ p->upstream.name = &peer->name;
+ p->upstream.get = ngx_event_get_peer;
+ p->upstream.log = s->connection->log;
+ p->upstream.log_error = NGX_ERROR_ERR;
+
+ rc = ngx_event_connect_peer(&p->upstream);
+
+ if (rc == NGX_ERROR || rc == NGX_BUSY || rc == NGX_DECLINED) {
+ ngx_mail_proxy_internal_server_error(s);
+ return;
+ }
+
+ ngx_add_timer(p->upstream.connection->read, cscf->timeout);
+
+ p->upstream.connection->data = s;
+ p->upstream.connection->pool = s->connection->pool;
+
+ s->connection->read->handler = ngx_mail_proxy_block_read;
+ p->upstream.connection->write->handler = ngx_mail_proxy_dummy_handler;
+
+ pcf = ngx_mail_get_module_srv_conf(s, ngx_mail_proxy_module);
+
+ s->proxy->buffer = ngx_create_temp_buf(s->connection->pool,
+ pcf->buffer_size);
+ if (s->proxy->buffer == NULL) {
+ ngx_mail_proxy_internal_server_error(s);
+ return;
+ }
+
+ s->out.len = 0;
+
+ switch (s->protocol) {
+
+ case NGX_MAIL_POP3_PROTOCOL:
+ p->upstream.connection->read->handler = ngx_mail_proxy_pop3_handler;
+ s->mail_state = ngx_pop3_start;
+ break;
+
+ case NGX_MAIL_IMAP_PROTOCOL:
+ p->upstream.connection->read->handler = ngx_mail_proxy_imap_handler;
+ s->mail_state = ngx_imap_start;
+ break;
+
+ default: /* NGX_MAIL_SMTP_PROTOCOL */
+ p->upstream.connection->read->handler = ngx_mail_proxy_smtp_handler;
+ s->mail_state = ngx_smtp_start;
+ break;
+ }
+}
+
+
+static void
+ngx_mail_proxy_block_read(ngx_event_t *rev)
+{
+ ngx_connection_t *c;
+ ngx_mail_session_t *s;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy block read");
+
+ if (ngx_handle_read_event(rev, 0) != NGX_OK) {
+ c = rev->data;
+ s = c->data;
+
+ ngx_mail_proxy_close_session(s);
+ }
+}
+
+
+static void
+ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
+{
+ u_char *p;
+ ngx_int_t rc;
+ ngx_str_t line;
+ ngx_connection_t *c;
+ ngx_mail_session_t *s;
+ ngx_mail_proxy_conf_t *pcf;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
+ "mail proxy pop3 auth handler");
+
+ c = rev->data;
+ s = c->data;
+
+ if (rev->timedout) {
+ ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
+ "upstream timed out");
+ c->timedout = 1;
+ ngx_mail_proxy_internal_server_error(s);
+ return;
+ }
+
+ rc = ngx_mail_proxy_read_response(s, 0);
+
+ if (rc == NGX_AGAIN) {
+ return;
+ }
+
+ if (rc == NGX_ERROR) {
+ ngx_mail_proxy_upstream_error(s);
+ return;
+ }
+
+ switch (s->mail_state) {
+
+ case ngx_pop3_start:
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
+
+ s->connection->log->action = "sending user name to upstream";
+
+ line.len = sizeof("USER ") - 1 + s->login.len + 2;
+ 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, "USER ", sizeof("USER ") - 1);
+ p = ngx_cpymem(p, s->login.data, s->login.len);
+ *p++ = CR; *p = LF;
+
+ s->mail_state = ngx_pop3_user;
+ break;
+
+ case ngx_pop3_user:
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send pass");
+
+ s->connection->log->action = "sending password to upstream";
+
+ line.len = sizeof("PASS ") - 1 + s->passwd.len + 2;
+ 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, "PASS ", sizeof("PASS ") - 1);
+ p = ngx_cpymem(p, s->passwd.data, s->passwd.len);
+ *p++ = CR; *p = LF;
+
+ s->mail_state = ngx_pop3_passwd;
+ break;
+
+ case ngx_pop3_passwd:
+ 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)
+ ngx_str_null(&line);
+#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_imap_handler(ngx_event_t *rev)
+{
+ u_char *p;
+ ngx_int_t rc;
+ ngx_str_t line;
+ ngx_connection_t *c;
+ ngx_mail_session_t *s;
+ ngx_mail_proxy_conf_t *pcf;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
+ "mail proxy imap auth handler");
+
+ c = rev->data;
+ s = c->data;
+
+ if (rev->timedout) {
+ ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
+ "upstream timed out");
+ c->timedout = 1;
+ ngx_mail_proxy_internal_server_error(s);
+ return;
+ }
+
+ rc = ngx_mail_proxy_read_response(s, s->mail_state);
+
+ if (rc == NGX_AGAIN) {
+ return;
+ }
+
+ if (rc == NGX_ERROR) {
+ ngx_mail_proxy_upstream_error(s);
+ return;
+ }
+
+ switch (s->mail_state) {
+
+ case ngx_imap_start:
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
+ "mail proxy send login");
+
+ s->connection->log->action = "sending LOGIN command to upstream";
+
+ line.len = s->tag.len + sizeof("LOGIN ") - 1
+ + 1 + NGX_SIZE_T_LEN + 1 + 2;
+ 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, "%VLOGIN {%uz}" CRLF,
+ &s->tag, s->login.len)
+ - line.data;
+
+ s->mail_state = ngx_imap_login;
+ break;
+
+ case ngx_imap_login:
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0, "mail proxy send user");
+
+ s->connection->log->action = "sending user name to upstream";
+
+ line.len = s->login.len + 1 + 1 + NGX_SIZE_T_LEN + 1 + 2;
+ 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, "%V {%uz}" CRLF,
+ &s->login, s->passwd.len)
+ - line.data;
+
+ s->mail_state = ngx_imap_user;
+ break;
+
+ case ngx_imap_user:
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
+ "mail proxy send passwd");
+
+ s->connection->log->action = "sending password to upstream";
+
+ line.len = s->passwd.len + 2;
+ 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->passwd.data, s->passwd.len);
+ *p++ = CR; *p = LF;
+
+ s->mail_state = ngx_imap_passwd;
+ break;
+
+ case ngx_imap_passwd:
+ 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)
+ ngx_str_null(&line);
+#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_smtp_handler(ngx_event_t *rev)
+{
+ u_char *p;
+ ngx_int_t rc;
+ ngx_str_t line;
+ ngx_buf_t *b;
+ ngx_connection_t *c;
+ ngx_mail_session_t *s;
+ ngx_mail_proxy_conf_t *pcf;
+ ngx_mail_core_srv_conf_t *cscf;
+
+ ngx_log_debug0(NGX_LOG_DEBUG_MAIL, rev->log, 0,
+ "mail proxy smtp auth handler");
+
+ c = rev->data;
+ s = c->data;
+
+ if (rev->timedout) {
+ ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT,
+ "upstream timed out");
+ c->timedout = 1;
+ ngx_mail_proxy_internal_server_error(s);
+ return;
+ }
+
+ rc = ngx_mail_proxy_read_response(s, s->mail_state);
+
+ if (rc == NGX_AGAIN) {
+ return;
+ }
+
+ if (rc == NGX_ERROR) {
+ ngx_mail_proxy_upstream_error(s);
+ return;
+ }
+
+ switch (s->mail_state) {
+
+ 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;
+
+#if (NGX_HAVE_INET6)
+ if (s->connection->sockaddr->sa_family == AF_INET6) {
+ line.len += sizeof("IPV6:") - 1;
+ }
+#endif
+
+ 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, "XCLIENT ADDR=", sizeof("XCLIENT ADDR=") - 1);
+
+#if (NGX_HAVE_INET6)
+ if (s->connection->sockaddr->sa_family == AF_INET6) {
+ p = ngx_cpymem(p, "IPV6:", sizeof("IPV6:") - 1);
+ }
+#endif
+
+ p = ngx_copy(p, s->connection->addr_text.data,
+ s->connection->addr_text.len);
+
+ if (s->login.len) {
+ p = ngx_cpymem(p, " LOGIN=", sizeof(" LOGIN=") - 1);
+ p = ngx_copy(p, s->login.data, s->login.len);
+ }
+
+ p = ngx_cpymem(p, " NAME=", sizeof(" NAME=") - 1);
+ p = ngx_copy(p, s->host.data, s->host.len);
+
+ *p++ = CR; *p++ = LF;
+
+ line.len = p - 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");
+
+ if (s->buffer->pos == s->buffer->last) {
+ ngx_mail_proxy_handler(s->connection->write);
+
+ } else {
+ ngx_mail_proxy_handler(c->write);
+ }
+
+ return;
+
+ default:
+#if (NGX_SUPPRESS_WARN)
+ ngx_str_null(&line);
+#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, *m;
+ 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 < 4) {
+ 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 */
+
+ if (p[3] == '-') {
+ /* multiline reply, check if we got last line */
+
+ m = b->last - (sizeof(CRLF "200" CRLF) - 1);
+
+ while (m > p) {
+ if (m[0] == CR && m[1] == LF) {
+ break;
+ }
+
+ m--;
+ }
+
+ if (m <= p || m[5] == '-') {
+ return NGX_AGAIN;
+ }
+ }
+
+ 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: %ui, #%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;
+}