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   BOOL    address_retry_include_sender;
  66   BOOL    allow_localhost;
  67   BOOL    authenticated_sender_force;
  68   BOOL    gethostbyname;
  69   BOOL    dns_qualify_single;
  70   BOOL    dns_search_parents;
  71   dnssec_domains dnssec;
  72   BOOL    delay_after_cutoff;
  73   BOOL    hosts_override;
  74   BOOL    hosts_randomize;
  75   BOOL    keepalive;
  76   BOOL    lmtp_ignore_quota;
  77   uschar *expand_retry_include_ip_address;
  78   BOOL    retry_include_ip_address;
  79 #ifdef SUPPORT_SOCKS
  80   uschar *socks_proxy;
  81 #endif
  82 #ifndef DISABLE_TLS
  83   uschar *tls_certificate;
  84   uschar *tls_crl;
  85   uschar *tls_privatekey;
  86   uschar *tls_require_ciphers;
  87 # ifdef EXPERIMENTAL_TLS_RESUME
  88   uschar *tls_resumption_hosts;
  89 # endif
  90   uschar *tls_sni;
  91   uschar *tls_verify_certificates;
  92   int     tls_dh_min_bits;
  93   BOOL    tls_tempfail_tryclear;
  94   uschar *tls_verify_hosts;
  95   uschar *tls_try_verify_hosts;
  96   uschar *tls_verify_cert_hostnames;
  97 #endif
  98 #ifdef SUPPORT_I18N
  99   uschar *utf8_downconvert;
 100 #endif
 101 #ifndef DISABLE_DKIM
 102   struct ob_dkim dkim;
 103 #endif
 104 #ifdef EXPERIMENTAL_ARC
 105   uschar *arc_sign;
 106 #endif
 107 } smtp_transport_options_block;
 108
 109 #define SOB (smtp_transport_options_block *)
 110
 111
 112 /* smtp connect context */
 113 typedef struct {
 114   uschar *              from_addr;
 115   address_item *        addrlist;
 116
 117   smtp_connect_args     conn_args;
 118   int                   port;
 119
 120   BOOL verify:1;
 121   BOOL lmtp:1;
 122   BOOL smtps:1;
 123   BOOL ok:1;
 124   BOOL setting_up:1;
 125 #ifndef DISABLE_PIPE_CONNECT
 126   BOOL early_pipe_ok:1;
 127   BOOL early_pipe_active:1;
 128 #endif
 129   BOOL esmtp:1;
 130   BOOL esmtp_sent:1;
 131   BOOL pipelining_used:1;
 132 #ifndef DISABLE_PRDR
 133   BOOL prdr_active:1;
 134 #endif
 135 #ifdef SUPPORT_I18N
 136   BOOL utf8_needed:1;
 137 #endif
 138   BOOL dsn_all_lasthop:1;
 139 #if !defined(DISABLE_TLS) && defined(SUPPORT_DANE)
 140   BOOL dane_required:1;
 141 #endif
 142 #ifndef DISABLE_PIPE_CONNECT
 143   BOOL pending_BANNER:1;
 144   BOOL pending_EHLO:1;
 145 #endif
 146   BOOL pending_MAIL:1;
 147   BOOL pending_BDAT:1;
 148   BOOL RCPT_452:1;
 149   BOOL good_RCPT:1;
 150   BOOL completed_addr:1;
 151   BOOL send_rset:1;
 152   BOOL send_quit:1;
 153
 154   int           max_rcpt;
 155   int           cmd_count;
 156
 157   unsigned      peer_offered;
 158   unsigned      avoid_option;
 159   uschar *      igquotstr;
 160   uschar *      helo_data;
 161 #ifdef EXPERIMENTAL_DSN_INFO
 162   uschar *      smtp_greeting;
 163   uschar *      helo_response;
 164 #endif
 165 #ifndef DISABLE_PIPE_CONNECT
 166   ehlo_resp_precis      ehlo_resp;
 167 #endif
 168
 169   struct timeval        delivery_start;
 170   address_item *        first_addr;
 171   address_item *        next_addr;
 172   address_item *        sync_addr;
 173
 174   client_conn_ctx       cctx;
 175   smtp_inblock          inblock;
 176   smtp_outblock         outblock;
 177   uschar        buffer[DELIVER_BUFFER_SIZE];
 178   uschar        inbuffer[4096];
 179   uschar        outbuffer[4096];
 180 } smtp_context;
 181
 182 extern int smtp_setup_conn(smtp_context *, BOOL);
 183 extern int smtp_write_mail_and_rcpt_cmds(smtp_context *, int *);
 184 extern int smtp_reap_early_pipe(smtp_context *, int *);
 185
 186
 187 /* Data for reading the private options. */
 188
 189 extern optionlist smtp_transport_options[];
 190 extern int smtp_transport_options_count;
 191
 192 /* Block containing default values. */
 193
 194 extern smtp_transport_options_block smtp_transport_option_defaults;
 195
 196 /* The main, init, and closedown entry points for the transport */
 197
 198 extern BOOL smtp_transport_entry(transport_instance *, address_item *);
 199 extern void smtp_transport_init(transport_instance *);
 200 extern void smtp_transport_closedown(transport_instance *);
 201
 202
 203
 204 #ifdef SUPPORT_SOCKS
 205 extern int     socks_sock_connect(host_item *, int, int, uschar *,
 206                  transport_instance *, int);
 207 #endif
 208
 209 /* End of transports/smtp.h */