diff options
Diffstat (limited to 'src/transports/smtp.h')
| -rw-r--r-- | src/transports/smtp.h | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/src/transports/smtp.h b/src/transports/smtp.h new file mode 100644 index 0000000..319e849 --- /dev/null +++ b/src/transports/smtp.h @@ -0,0 +1,252 @@ +/************************************************* +* Exim - an Internet mail transport agent * +*************************************************/ + +/* Copyright (c) The Exim Maintainers 2020 - 2022 */ +/* Copyright (c) University of Cambridge 1995 - 2018 */ +/* See the file NOTICE for conditions of use and distribution. */ + +#define DELIVER_BUFFER_SIZE 4096 + +#define PENDING 256 +#define PENDING_DEFER (PENDING + DEFER) +#define PENDING_OK (PENDING + OK) + + +#ifndef DISABLE_TLS +/* Flags structure for validity of TLS configuration */ + +typedef struct { + BOOL conn_certs:1; /* certificates etc. loaded */ + BOOL cabundle:1; /* CA certificates loaded */ + BOOL crl:1; /* CRL loaded */ + BOOL pri_string:1; /* cipher priority-string cache loaded */ + BOOL dh:1; /* Diffie-Helman params loaded */ + BOOL ecdh:1; /* EC Diffie-Helman params loaded */ + + BOOL ca_rdn_emulate:1; /* do not advertise usable-cert list */ + BOOL ocsp_hook:1; /* need hshake callback on session */ + + void * libdata0; /* library-dependent preloaded data */ + void * libdata1; /* library-dependent preloaded data */ +} exim_tlslib_state; +#endif + + +/* Private structure for the private options and other private data. */ + +typedef struct { + uschar *hosts; + uschar *fallback_hosts; + host_item *hostlist; + host_item *fallback_hostlist; + uschar *authenticated_sender; + uschar *helo_data; + uschar *interface; + uschar *port; + uschar *protocol; + uschar *dscp; + uschar *serialize_hosts; + uschar *hosts_try_auth; + uschar *hosts_require_alpn; + uschar *hosts_require_auth; + uschar *hosts_try_chunking; +#ifdef SUPPORT_DANE + uschar *hosts_try_dane; + uschar *hosts_require_dane; + uschar *dane_require_tls_ciphers; +#endif + uschar *hosts_try_fastopen; +#ifndef DISABLE_PRDR + uschar *hosts_try_prdr; +#endif +#ifndef DISABLE_OCSP + uschar *hosts_request_ocsp; + uschar *hosts_require_ocsp; +#endif + uschar *hosts_require_tls; + uschar *hosts_avoid_tls; + uschar *hosts_verify_avoid_tls; + uschar *hosts_avoid_pipelining; +#ifndef DISABLE_PIPE_CONNECT + uschar *hosts_pipe_connect; +#endif + uschar *hosts_avoid_esmtp; +#ifndef DISABLE_TLS + uschar *hosts_nopass_tls; + uschar *hosts_noproxy_tls; +#endif + int command_timeout; + int connect_timeout; + int data_timeout; + int final_timeout; + int size_addition; + int hosts_max_try; + int hosts_max_try_hardlimit; + int message_linelength_limit; + BOOL address_retry_include_sender; + BOOL allow_localhost; + BOOL authenticated_sender_force; + BOOL gethostbyname; + BOOL dns_qualify_single; + BOOL dns_search_parents; + dnssec_domains dnssec; + BOOL delay_after_cutoff; + BOOL hosts_override; + BOOL hosts_randomize; + BOOL keepalive; + BOOL lmtp_ignore_quota; + uschar *expand_retry_include_ip_address; + BOOL retry_include_ip_address; +#ifdef SUPPORT_SOCKS + uschar *socks_proxy; +#endif +#ifndef DISABLE_TLS + uschar *tls_alpn; + uschar *tls_certificate; + uschar *tls_crl; + uschar *tls_privatekey; + uschar *tls_require_ciphers; +# ifndef DISABLE_TLS_RESUME + uschar *host_name_extract; + uschar *tls_resumption_hosts; +# endif + const uschar *tls_sni; + uschar *tls_verify_certificates; + int tls_dh_min_bits; + BOOL tls_tempfail_tryclear; + uschar *tls_verify_hosts; + uschar *tls_try_verify_hosts; + uschar *tls_verify_cert_hostnames; +#endif +#ifdef SUPPORT_I18N + uschar *utf8_downconvert; +#endif +#ifndef DISABLE_DKIM + struct ob_dkim dkim; +#endif +#ifdef EXPERIMENTAL_ARC + uschar *arc_sign; +#endif +#ifndef DISABLE_TLS + exim_tlslib_state tls_preload; +#endif +} smtp_transport_options_block; + +#define SOB (smtp_transport_options_block *) + + +/* smtp connect context */ +typedef struct { + uschar * from_addr; + address_item * addrlist; + + smtp_connect_args conn_args; + int port; + + BOOL verify:1; + BOOL lmtp:1; + BOOL smtps:1; + BOOL ok:1; + BOOL setting_up:1; +#ifndef DISABLE_PIPE_CONNECT + BOOL early_pipe_ok:1; + BOOL early_pipe_active:1; +#endif + BOOL esmtp:1; + BOOL esmtp_sent:1; + BOOL pipelining_used:1; +#ifndef DISABLE_PRDR + BOOL prdr_active:1; +#endif +#ifdef SUPPORT_I18N + BOOL utf8_needed:1; +#endif + BOOL dsn_all_lasthop:1; +#if !defined(DISABLE_TLS) && defined(SUPPORT_DANE) + BOOL dane_required:1; +#endif +#ifndef DISABLE_PIPE_CONNECT + BOOL pending_BANNER:1; + BOOL pending_EHLO:1; +#endif + BOOL pending_MAIL:1; + BOOL pending_BDAT:1; + BOOL RCPT_452:1; + BOOL good_RCPT:1; +#ifdef EXPERIMENTAL_ESMTP_LIMITS + BOOL single_rcpt_domain:1; +#endif + BOOL completed_addr:1; + BOOL send_rset:1; + BOOL send_quit:1; + BOOL send_tlsclose:1; + + unsigned peer_offered; +#ifdef EXPERIMENTAL_ESMTP_LIMITS + unsigned peer_limit_mail; + unsigned peer_limit_rcpt; + unsigned peer_limit_rcptdom; +#endif + + unsigned max_mail; + int max_rcpt; + int cmd_count; + + unsigned avoid_option; + uschar * igquotstr; + uschar * helo_data; +#ifdef EXPERIMENTAL_DSN_INFO + uschar * smtp_greeting; + uschar * helo_response; +#endif +#ifndef DISABLE_PIPE_CONNECT + /* Info about the EHLO response stored to / retrieved from cache. When + operating early-pipe, we use the cached values. For each of plaintext and + crypted we store bitmaps for ESMTP features and AUTH methods. If the LIMITS + extension is built and usable them at least one of the limits values cached + is nonzero, and we use the values to constrain the connection. */ + ehlo_resp_precis ehlo_resp; +#endif + + struct timeval delivery_start; + address_item * first_addr; + address_item * next_addr; + address_item * sync_addr; + + client_conn_ctx cctx; + smtp_inblock inblock; + smtp_outblock outblock; + uschar buffer[DELIVER_BUFFER_SIZE]; + uschar inbuffer[4096]; + uschar outbuffer[4096]; +} smtp_context; + +extern int smtp_setup_conn(smtp_context *, BOOL); +extern int smtp_write_mail_and_rcpt_cmds(smtp_context *, int *); +extern int smtp_reap_early_pipe(smtp_context *, int *); + + +/* Data for reading the private options. */ + +extern optionlist smtp_transport_options[]; +extern int smtp_transport_options_count; + +/* Block containing default values. */ + +extern smtp_transport_options_block smtp_transport_option_defaults; + +/* The main, init, and closedown entry points for the transport */ + +extern BOOL smtp_transport_entry(transport_instance *, address_item *); +extern void smtp_transport_init(transport_instance *); +extern void smtp_transport_closedown(transport_instance *); + + + +#ifdef SUPPORT_SOCKS +extern int socks_sock_connect(host_item *, int, int, uschar *, + transport_instance *, int); +#endif + +/* End of transports/smtp.h */ |