src/src/transports/smtp.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* Copyright (c) The Exim Maintainers 2020 */
   7 /* See the file NOTICE for conditions of use and distribution. */
   8
   9 #define DELIVER_BUFFER_SIZE 4096
  10
  11 #define PENDING          256
  12 #define PENDING_DEFER   (PENDING + DEFER)
  13 #define PENDING_OK      (PENDING + OK)
  14
  15
  16 /* Private structure for the private options and other private data. */
  17
  18 typedef struct {
  19   uschar        *hosts;
  20   uschar        *fallback_hosts;
  21   host_item     *hostlist;
  22   host_item     *fallback_hostlist;
  23   uschar        *authenticated_sender;
  24   uschar        *helo_data;
  25   uschar        *interface;
  26   uschar        *port;
  27   uschar        *protocol;
  28   uschar        *dscp;
  29   uschar        *serialize_hosts;
  30   uschar        *hosts_try_auth;
  31   uschar        *hosts_require_auth;
  32   uschar        *hosts_try_chunking;
  33 #ifdef SUPPORT_DANE
  34   uschar        *hosts_try_dane;
  35   uschar        *hosts_require_dane;
  36   uschar        *dane_require_tls_ciphers;
  37 #endif
  38   uschar        *hosts_try_fastopen;
  39 #ifndef DISABLE_PRDR
  40   uschar        *hosts_try_prdr;
  41 #endif
  42 #ifndef DISABLE_OCSP
  43   uschar        *hosts_request_ocsp;
  44   uschar        *hosts_require_ocsp;
  45 #endif
  46   uschar        *hosts_require_tls;
  47   uschar        *hosts_avoid_tls;
  48   uschar        *hosts_verify_avoid_tls;
  49   uschar        *hosts_avoid_pipelining;
  50 #ifndef DISABLE_PIPE_CONNECT
  51   uschar        *hosts_pipe_connect;
  52 #endif
  53   uschar        *hosts_avoid_esmtp;
  54 #ifndef DISABLE_TLS
  55   uschar        *hosts_nopass_tls;
  56   uschar        *hosts_noproxy_tls;
  57 #endif
  58   int           command_timeout;
  59   int           connect_timeout;
  60   int           data_timeout;
  61   int           final_timeout;
  62   int           size_addition;
  63   int           hosts_max_try;
  64   int           hosts_max_try_hardlimit;
  65   int                   message_linelength_limit;
  66   BOOL          address_retry_include_sender;
  67   BOOL          allow_localhost;
  68   BOOL          authenticated_sender_force;
  69   BOOL          gethostbyname;
  70   BOOL          dns_qualify_single;
  71   BOOL          dns_search_parents;
  72   dnssec_domains dnssec;
  73   BOOL          delay_after_cutoff;
  74   BOOL          hosts_override;
  75   BOOL          hosts_randomize;
  76   BOOL          keepalive;
  77   BOOL          lmtp_ignore_quota;
  78   uschar        *expand_retry_include_ip_address;
  79   BOOL          retry_include_ip_address;
  80 #ifdef SUPPORT_SOCKS
  81   uschar        *socks_proxy;
  82 #endif
  83 #ifndef DISABLE_TLS
  84   uschar        *tls_certificate;
  85   uschar        *tls_crl;
  86   uschar        *tls_privatekey;
  87   uschar        *tls_require_ciphers;
  88 # ifndef DISABLE_TLS_RESUME
  89   uschar        *tls_resumption_hosts;
  90 # endif
  91   const uschar  *tls_sni;
  92   uschar        *tls_verify_certificates;
  93   int           tls_dh_min_bits;
  94   BOOL          tls_tempfail_tryclear;
  95   uschar        *tls_verify_hosts;
  96   uschar        *tls_try_verify_hosts;
  97   uschar        *tls_verify_cert_hostnames;
  98 #endif
  99 #ifdef SUPPORT_I18N
 100   uschar        *utf8_downconvert;
 101 #endif
 102 #ifndef DISABLE_DKIM
 103   struct ob_dkim dkim;
 104 #endif
 105 #ifdef EXPERIMENTAL_ARC
 106   uschar        *arc_sign;
 107 #endif
 108 } smtp_transport_options_block;
 109
 110 #define SOB (smtp_transport_options_block *)
 111
 112
 113 /* smtp connect context */
 114 typedef struct {
 115   uschar *              from_addr;
 116   address_item *        addrlist;
 117
 118   smtp_connect_args     conn_args;
 119   int                   port;
 120
 121   BOOL verify:1;
 122   BOOL lmtp:1;
 123   BOOL smtps:1;
 124   BOOL ok:1;
 125   BOOL setting_up:1;
 126 #ifndef DISABLE_PIPE_CONNECT
 127   BOOL early_pipe_ok:1;
 128   BOOL early_pipe_active:1;
 129 #endif
 130   BOOL esmtp:1;
 131   BOOL esmtp_sent:1;
 132   BOOL pipelining_used:1;
 133 #ifndef DISABLE_PRDR
 134   BOOL prdr_active:1;
 135 #endif
 136 #ifdef SUPPORT_I18N
 137   BOOL utf8_needed:1;
 138 #endif
 139   BOOL dsn_all_lasthop:1;
 140 #if !defined(DISABLE_TLS) && defined(SUPPORT_DANE)
 141   BOOL dane_required:1;
 142 #endif
 143 #ifndef DISABLE_PIPE_CONNECT
 144   BOOL pending_BANNER:1;
 145   BOOL pending_EHLO:1;
 146 #endif
 147   BOOL pending_MAIL:1;
 148   BOOL pending_BDAT:1;
 149   BOOL RCPT_452:1;
 150   BOOL good_RCPT:1;
 151   BOOL completed_addr:1;
 152   BOOL send_rset:1;
 153   BOOL send_quit:1;
 154
 155   int           max_rcpt;
 156   int           cmd_count;
 157
 158   unsigned      peer_offered;
 159   unsigned      avoid_option;
 160   uschar *      igquotstr;
 161   uschar *      helo_data;
 162 #ifdef EXPERIMENTAL_DSN_INFO
 163   uschar *      smtp_greeting;
 164   uschar *      helo_response;
 165 #endif
 166 #ifndef DISABLE_PIPE_CONNECT
 167   ehlo_resp_precis      ehlo_resp;
 168 #endif
 169
 170   struct timeval        delivery_start;
 171   address_item *        first_addr;
 172   address_item *        next_addr;
 173   address_item *        sync_addr;
 174
 175   client_conn_ctx       cctx;
 176   smtp_inblock          inblock;
 177   smtp_outblock         outblock;
 178   uschar        buffer[DELIVER_BUFFER_SIZE];
 179   uschar        inbuffer[4096];
 180   uschar        outbuffer[4096];
 181 } smtp_context;
 182
 183 extern int smtp_setup_conn(smtp_context *, BOOL);
 184 extern int smtp_write_mail_and_rcpt_cmds(smtp_context *, int *);
 185 extern int smtp_reap_early_pipe(smtp_context *, int *);
 186
 187
 188 /* Data for reading the private options. */
 189
 190 extern optionlist smtp_transport_options[];
 191 extern int smtp_transport_options_count;
 192
 193 /* Block containing default values. */
 194
 195 extern smtp_transport_options_block smtp_transport_option_defaults;
 196
 197 /* The main, init, and closedown entry points for the transport */
 198
 199 extern BOOL smtp_transport_entry(transport_instance *, address_item *);
 200 extern void smtp_transport_init(transport_instance *);
 201 extern void smtp_transport_closedown(transport_instance *);
 202
 203
 204
 205 #ifdef SUPPORT_SOCKS
 206 extern int     socks_sock_connect(host_item *, int, int, uschar *,
 207                  transport_instance *, int);
 208 #endif
 209
 210 /* End of transports/smtp.h */