/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include #include #include #include #include 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) { int keepalive; 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); if (cscf->so_keepalive) { keepalive = 1; if (setsockopt(s->connection->fd, SOL_SOCKET, SO_KEEPALIVE, (const void *) &keepalive, sizeof(int)) == -1) { ngx_log_error(NGX_LOG_ALERT, s->connection->log, ngx_socket_errno, "setsockopt(SO_KEEPALIVE) failed"); } } 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; 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"); 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: %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; }