diff options
Diffstat (limited to 'app/nginx/src/mail/ngx_mail_proxy_module.c')
-rw-r--r-- | app/nginx/src/mail/ngx_mail_proxy_module.c | 1123 |
1 files changed, 0 insertions, 1123 deletions
diff --git a/app/nginx/src/mail/ngx_mail_proxy_module.c b/app/nginx/src/mail/ngx_mail_proxy_module.c deleted file mode 100644 index 007284b..0000000 --- a/app/nginx/src/mail/ngx_mail_proxy_module.c +++ /dev/null @@ -1,1123 +0,0 @@ - -/* - * 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; -} |