/*************************************************
*     Exim - an Internet mail transport agent    *
*************************************************/

/* Copyright (c) University of Cambridge 1995 - 2018 */
/* Copyright (c) The Exim Maintainers 2020 */
/* 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)


/* 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_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;
  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_certificate;
  uschar *tls_crl;
  uschar *tls_privatekey;
  uschar *tls_require_ciphers;
# ifdef EXPERIMENTAL_TLS_RESUME
  uschar *tls_resumption_hosts;
# endif
  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
} 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;
  BOOL completed_addr:1;
  BOOL send_rset:1;
  BOOL send_quit:1;

  int		max_rcpt;
  int		cmd_count;

  unsigned	peer_offered;
  unsigned	avoid_option;
  uschar *	igquotstr;
  uschar *	helo_data;
#ifdef EXPERIMENTAL_DSN_INFO
  uschar *	smtp_greeting;
  uschar *	helo_response;
#endif
#ifndef DISABLE_PIPE_CONNECT
  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 */