src/src/structs.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2018 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8
   9 /* Definitions of various structures. In addition, those that are visible for
  10 the compilation of local_scan() are defined in local_scan.h. These are
  11
  12   header_line
  13   optionlist
  14   recipient_item
  15
  16 For those declared here, we have to pre-declare some because of mutually
  17 recursive definitions in the auths, routers, and transports blocks. */
  18
  19 struct address_item;
  20 struct auth_info;
  21 struct driver_info;
  22 struct director_info;
  23 struct smtp_inblock;
  24 struct smtp_outblock;
  25 struct transport_info;
  26 struct router_info;
  27
  28 /* Growable-string */
  29 typedef struct gstring {
  30   int   size;           /* Current capacity of string memory */
  31   int   ptr;            /* Offset at which to append further chars */
  32   uschar * s;           /* The string memory */
  33 } gstring;
  34
  35 /* Structure for remembering macros for the configuration file */
  36
  37 typedef struct macro_item {
  38   struct  macro_item * next;
  39   BOOL          command_line;
  40   unsigned      namelen;
  41   unsigned      replen;
  42   const uschar * name;
  43   const uschar * replacement;
  44 } macro_item;
  45
  46 /* Structure for bit tables for debugging and logging */
  47
  48 typedef struct bit_table {
  49   uschar *name;
  50   int bit;
  51 } bit_table;
  52
  53 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
  54
  55 typedef struct ugid_block {
  56   uid_t   uid;
  57   gid_t   gid;
  58   BOOL    uid_set;
  59   BOOL    gid_set;
  60   BOOL    initgroups;
  61 } ugid_block;
  62
  63 typedef enum {  CHUNKING_NOT_OFFERED = -1,
  64                 CHUNKING_OFFERED,
  65                 CHUNKING_ACTIVE,
  66                 CHUNKING_LAST} chunking_state_t;
  67
  68 /* Structure for holding information about a host for use mainly by routers,
  69 but also used when checking lists of hosts and when transporting. Looking up
  70 host addresses is done using this structure. */
  71
  72 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
  73
  74 typedef struct host_item {
  75   struct host_item *next;
  76   const uschar *name;             /* Host name */
  77   const uschar *address;          /* IP address in text form */
  78   int     port;                   /* port value in host order (if SRV lookup) */
  79   int     mx;                     /* MX value if found via MX records */
  80   int     sort_key;               /* MX*1000 plus random "fraction" */
  81   int     status;                 /* Usable, unusable, or unknown */
  82   int     why;                    /* Why host is unusable */
  83   int     last_try;               /* Time of last try if known */
  84   dnssec_status_t dnssec;
  85 } host_item;
  86
  87 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
  88 rewrite_headers field of a transport. */
  89
  90 typedef struct rewrite_rule {
  91   struct rewrite_rule *next;
  92   int     flags;
  93   uschar *key;
  94   uschar *replacement;
  95 } rewrite_rule;
  96
  97 /* This structure is used to pass back configuration data from the smtp
  98 transport to the outside world. It is used during callback processing. If ever
  99 another remote transport were implemented, it could use the same structure. */
 100
 101 typedef struct transport_feedback {
 102   uschar *interface;
 103   uschar *port;
 104   uschar *protocol;
 105   uschar *hosts;
 106   uschar *helo_data;
 107   BOOL   hosts_override;
 108   BOOL   hosts_randomize;
 109   BOOL   gethostbyname;
 110   BOOL   qualify_single;
 111   BOOL   search_parents;
 112 } transport_feedback;
 113
 114 /* Routers, transports, and authenticators have similar data blocks. Each
 115 driver that is compiled into the code is represented by a xxx_info block; the
 116 active drivers are represented by a chain of xxx_instance blocks. To make it
 117 possible to use the same code for reading the configuration files for all
 118 three, the layout of the start of the blocks is kept the same, and represented
 119 by the generic structures driver_info and driver_instance. */
 120
 121 typedef struct driver_instance {
 122   struct driver_instance *next;
 123   uschar *name;                   /* Instance name */
 124   struct driver_info *info;       /* Points to info for this driver */
 125   void   *options_block;          /* Pointer to private options */
 126   uschar *driver_name;            /* All start with this generic option */
 127 } driver_instance;
 128
 129 typedef struct driver_info {
 130   uschar *driver_name;            /* Name of driver */
 131   optionlist *options;            /* Table of private options names */
 132   int    *options_count;          /* -> Number of entries in table */
 133   void   *options_block;          /* Points to default private block */
 134   int     options_len;            /* Length of same in bytes */
 135   void  (*init)(                  /* Initialization entry point */
 136     struct driver_instance *);
 137 } driver_info;
 138
 139
 140 /* Structure for holding information about the configured transports. Some
 141 of the generally accessible options are set from the configuration file; others
 142 are set by transport initialization, since they can only be set for certain
 143 transports. They need to be generally accessible, however, as they are used by
 144 the main transport code. */
 145
 146 typedef struct transport_instance {
 147   struct transport_instance *next;
 148   uschar *name;                   /* Instance name */
 149   struct transport_info *info;    /* Info for this driver */
 150   void *options_block;            /* Pointer to private options */
 151   uschar *driver_name;            /* Must be first */
 152   int   (*setup)(                 /* Setup entry point */
 153     struct transport_instance *,
 154     struct address_item *,
 155     struct transport_feedback *,  /* For passing back config data */
 156     uid_t,                        /* The uid that will be used */
 157     gid_t,                        /* The gid that will be used */
 158     uschar **);                   /* For an error message */
 159                                   /**************************************/
 160   int     batch_max;              /* )                                  */
 161   uschar *batch_id;               /* )                                  */
 162   uschar *home_dir;               /* ) Used only for local transports   */
 163   uschar *current_dir;            /* )                                  */
 164                                   /**************************************/
 165   uschar *expand_multi_domain;    /* )                                  */
 166   BOOL    multi_domain;           /* )                                  */
 167   BOOL    overrides_hosts;        /* ) Used only for remote transports  */
 168   int     max_addresses;          /* )                                  */
 169   int     connection_max_messages;/* )                                  */
 170                                   /**************************************/
 171   BOOL    deliver_as_creator;     /* Used only by pipe at present */
 172   BOOL    disable_logging;        /* For very weird requirements */
 173   BOOL    initgroups;             /* Initialize groups when setting uid */
 174   BOOL    uid_set;                /* uid is set */
 175   BOOL    gid_set;                /* gid is set */
 176   uid_t   uid;
 177   gid_t   gid;
 178   uschar *expand_uid;             /* Variable uid */
 179   uschar *expand_gid;             /* Variable gid */
 180   uschar *warn_message;           /* Used only by appendfile at present */
 181   uschar *shadow;                 /* Name of shadow transport */
 182   uschar *shadow_condition;       /* Condition for running it */
 183   uschar *filter_command;         /* For on-the-fly-filtering */
 184   uschar *add_headers;            /* Add these headers */
 185   uschar *remove_headers;         /* Remove these headers */
 186   uschar *return_path;            /* Overriding (rewriting) return path */
 187   uschar *debug_string;           /* Debugging output */
 188   uschar *max_parallel;           /* Number of concurrent instances */
 189   uschar *message_size_limit;     /* Biggest message this transport handles */
 190   uschar *headers_rewrite;        /* Rules for rewriting headers */
 191   rewrite_rule *rewrite_rules;    /* Parsed rewriting rules */
 192   int     rewrite_existflags;     /* Bits showing which headers are rewritten */
 193   int     filter_timeout;         /* For transport filter timing */
 194   BOOL    body_only;              /* Deliver only the body */
 195   BOOL    delivery_date_add;      /* Add Delivery-Date header */
 196   BOOL    envelope_to_add;        /* Add Envelope-To header */
 197   BOOL    headers_only;           /* Deliver only the headers */
 198   BOOL    rcpt_include_affixes;   /* TRUE to retain affixes in RCPT commands */
 199   BOOL    return_path_add;        /* Add Return-Path header */
 200   BOOL    return_output;          /* TRUE if output should always be returned */
 201   BOOL    return_fail_output;     /* ditto, but only on failure */
 202   BOOL    log_output;             /* Similarly for logging */
 203   BOOL    log_fail_output;
 204   BOOL    log_defer_output;
 205   BOOL    retry_use_local_part;   /* Defaults true for local, false for remote */
 206 #ifndef DISABLE_EVENT
 207   uschar  *event_action;          /* String to expand on notable events */
 208 #endif
 209 } transport_instance;
 210
 211
 212 /* Structure for holding information about a type of transport. The first six
 213 fields must match driver_info above. */
 214
 215 typedef struct transport_info {
 216   uschar *driver_name;            /* Driver name */
 217   optionlist *options;            /* Table of private options names */
 218   int    *options_count;          /* -> Number of entries in table */
 219   void   *options_block;          /* Points to default private block */
 220   int     options_len;            /* Length of same in bytes */
 221   void (*init)(                   /* Initialization function */
 222     struct transport_instance *);
 223 /****/
 224   BOOL (*code)(                   /* Main entry point */
 225     transport_instance *,
 226     struct address_item *);
 227   void (*tidyup)(                 /* Tidyup function */
 228     struct transport_instance *);
 229   void  (*closedown)(             /* For closing down a passed channel */
 230     struct transport_instance *);
 231   BOOL    local;                  /* TRUE for local transports */
 232 } transport_info;
 233
 234
 235 /* smtp transport datachunk callback */
 236
 237 #define tc_reap_prev    BIT(0)  /* Flags: reap previous SMTP cmd responses */
 238 #define tc_chunk_last   BIT(1)  /* annotate chunk SMTP cmd as LAST */
 239
 240 struct transport_context;
 241 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
 242
 243 /* Structure for information about a delivery-in-progress */
 244
 245 typedef struct transport_context {
 246   union {                       /* discriminated by option topt_output_string */
 247     int                   fd;   /* file descriptor to write message to */
 248     gstring *             msg;  /* allocated string with written message */
 249   } u;
 250   transport_instance    * tblock;               /* transport */
 251   struct address_item   * addr;
 252   uschar                * check_string;         /* string replacement */
 253   uschar                * escape_string;
 254   int                     options;              /* output processing topt_* */
 255
 256   /* items below only used with option topt_use_bdat */
 257   tpt_chunk_cmd_cb        chunk_cb;             /* per-datachunk callback */
 258   void                  * smtp_context;
 259 } transport_ctx;
 260
 261
 262
 263 typedef struct {
 264   uschar *request;
 265   uschar *require;
 266 } dnssec_domains;
 267
 268 /* Structure for holding information about the configured routers. */
 269
 270 typedef struct router_instance {
 271   struct router_instance *next;
 272   uschar *name;
 273   struct router_info *info;
 274   void   *options_block;          /* Pointer to private options */
 275   uschar *driver_name;            /* Must be first */
 276
 277   uschar *address_data;           /* Arbitrary data */
 278 #ifdef EXPERIMENTAL_BRIGHTMAIL
 279   uschar *bmi_rule;               /* Brightmail AntiSpam rule checking */
 280 #endif
 281   uschar *cannot_route_message;   /* Used when routing fails */
 282   uschar *condition;              /* General condition */
 283   uschar *current_directory;      /* For use during delivery */
 284   uschar *debug_string;           /* Debugging output */
 285   uschar *domains;                /* Specific domains */
 286   uschar *errors_to;              /* Errors address */
 287   uschar *expand_gid;             /* Expanded gid string */
 288   uschar *expand_uid;             /* Expanded uid string */
 289   uschar *expand_more;            /* Expanded more string */
 290   uschar *expand_unseen;          /* Expanded unseen string */
 291   uschar *extra_headers;          /* Additional headers */
 292   uschar *fallback_hosts;         /* For remote transports (text list) */
 293   uschar *home_directory;         /* For use during delivery */
 294   uschar *ignore_target_hosts;    /* Target hosts to ignore */
 295   uschar *local_parts;            /* Specific local parts */
 296   uschar *pass_router_name;       /* Router for passed address */
 297   uschar *prefix;                 /* Address prefix */
 298   uschar *redirect_router_name;   /* Router for generated address */
 299   uschar *remove_headers;         /* Removed headers */
 300   uschar *require_files;          /* File checks before router is run */
 301   uschar *router_home_directory;  /* For use while routing */
 302   uschar *self;                   /* Text option for handling self reference */
 303   uschar *senders;                /* Specific senders */
 304   uschar *suffix;                 /* Address suffix */
 305   uschar *translate_ip_address;   /* IP address translation fudgery */
 306   uschar *transport_name;         /* Transport name */
 307
 308   BOOL    address_test;           /* Use this router when testing addresses */
 309 #ifdef EXPERIMENTAL_BRIGHTMAIL
 310   BOOL    bmi_deliver_alternate;  /* TRUE => BMI said that message should be delivered to alternate location */
 311   BOOL    bmi_deliver_default;    /* TRUE => BMI said that message should be delivered to default location */
 312   BOOL    bmi_dont_deliver;       /* TRUE => BMI said that message should not be delivered at all */
 313 #endif
 314   BOOL    expn;                   /* Use this router when processing EXPN */
 315   BOOL    caseful_local_part;     /* TRUE => don't lowercase */
 316   BOOL    check_local_user;       /* TRUE => check local user */
 317   BOOL    disable_logging;        /* For very weird requirements */
 318   BOOL    fail_verify_recipient;  /* Fail verify if recipient match this router */
 319   BOOL    fail_verify_sender;     /* Fail verify if sender match this router */
 320   BOOL    gid_set;                /* Flag to indicate gid is set */
 321   BOOL    initgroups;             /* TRUE if initgroups is required */
 322   BOOL    log_as_local;           /* TRUE logs as a local delivery */
 323   BOOL    more;                   /* If FALSE, do no more if this one fails */
 324   BOOL    pass_on_timeout;        /* Treat timeout DEFERs as fails */
 325   BOOL    prefix_optional;        /* Just what it says */
 326   BOOL    repeat_use;             /* If FALSE, skip if ancestor used it */
 327   BOOL    retry_use_local_part;   /* Just what it says */
 328   BOOL    same_domain_copy_routing; /* TRUE => copy routing for same domain */
 329   BOOL    self_rewrite;           /* TRUE to rewrite headers if making local */
 330   BOOL    suffix_optional;        /* As it says */
 331   BOOL    verify_only;            /* Skip this router if not verifying */
 332   BOOL    verify_recipient;       /* Use this router when verifying a recipient*/
 333   BOOL    verify_sender;          /* Use this router when verifying a sender */
 334   BOOL    uid_set;                /* Flag to indicate uid is set */
 335   BOOL    unseen;                 /* If TRUE carry on, even after success */
 336   BOOL    dsn_lasthop;            /* If TRUE, this router is a DSN endpoint */
 337
 338   int     self_code;              /* Encoded version of "self" */
 339   uid_t   uid;                    /* Fixed uid value */
 340   gid_t   gid;                    /* Fixed gid value */
 341
 342   host_item *fallback_hostlist;   /* For remote transport (block chain) */
 343   transport_instance *transport;  /* Transport block (when found) */
 344   struct router_instance *pass_router; /* Actual router for passed address */
 345   struct router_instance *redirect_router; /* Actual router for generated address */
 346
 347   dnssec_domains dnssec;
 348 } router_instance;
 349
 350
 351 /* Structure for holding information about a type of router. The first six
 352 fields must match driver_info above. */
 353
 354 typedef struct router_info {
 355   uschar *driver_name;
 356   optionlist *options;            /* Table of private options names */
 357   int    *options_count;          /* -> Number of entries in table */
 358   void   *options_block;          /* Points to default private block */
 359   int     options_len;            /* Length of same in bytes */
 360   void (*init)(                   /* Initialization function */
 361     struct router_instance *);
 362 /****/
 363   int (*code)(                    /* Main entry point */
 364     router_instance *,
 365     struct address_item *,
 366     struct passwd *,
 367     int,
 368     struct address_item **,
 369     struct address_item **,
 370     struct address_item **,
 371     struct address_item **);
 372   void (*tidyup)(                 /* Tidyup function */
 373     struct router_instance *);
 374   int     ri_flags;               /* Descriptive flags */
 375 } router_info;
 376
 377
 378 /* Structure for holding information about a lookup type. */
 379
 380 #include "lookupapi.h"
 381
 382
 383 /* Structure for holding information about the configured authentication
 384 mechanisms */
 385
 386 typedef struct auth_instance {
 387   struct auth_instance *next;
 388   uschar *name;                   /* Exim instance name */
 389   struct auth_info *info;         /* Pointer to driver info block */
 390   void   *options_block;          /* Pointer to private options */
 391   uschar *driver_name;            /* Must be first */
 392   uschar *advertise_condition;    /* Are we going to advertise this?*/
 393   uschar *client_condition;       /* Should the client try this? */
 394   uschar *public_name;            /* Advertised name */
 395   uschar *set_id;                 /* String to set when server as authenticated id */
 396   uschar *set_client_id;          /* String to set when client as client_authenticated id */
 397   uschar *mail_auth_condition;    /* Condition for AUTH on MAIL command */
 398   uschar *server_debug_string;    /* Debugging output */
 399   uschar *server_condition;       /* Authorization condition */
 400   BOOL    client;                 /* TRUE if client option(s) set */
 401   BOOL    server;                 /* TRUE if server options(s) set */
 402   BOOL    advertised;             /* Set TRUE when advertised */
 403 } auth_instance;
 404
 405
 406 /* Structure for holding information about an authentication mechanism. The
 407 first six fields must match driver_info above. */
 408
 409 typedef struct auth_info {
 410   uschar *driver_name;            /* e.g. "condition" */
 411   optionlist *options;            /* Table of private options names */
 412   int    *options_count;          /* -> Number of entries in table */
 413   void   *options_block;          /* Points to default private block */
 414   int     options_len;            /* Length of same in bytes */
 415   void (*init)(                   /* initialization function */
 416     struct auth_instance *);
 417 /****/
 418   int (*servercode)(              /* server function */
 419     auth_instance *,              /* the instance data */
 420     uschar *);                    /* rest of AUTH command */
 421   int (*clientcode)(              /* client function */
 422     struct auth_instance *,
 423     void *,                       /* smtp conn, with socket, output and input buffers */
 424     int,                          /* command timeout */
 425     uschar *,                     /* buffer for reading response */
 426     int);                         /* sizeof buffer */
 427   void (*version_report)(         /* diagnostic version reporting */
 428     FILE *);                      /* I/O stream to print to */
 429 } auth_info;
 430
 431
 432 /* Structure for holding a single IP address and port; used for the chain of
 433 addresses and ports for the local host. Make the char string large enough to
 434 hold an IPv6 address. */
 435
 436 typedef struct ip_address_item {
 437   struct ip_address_item *next;
 438   int    port;
 439   BOOL   v6_include_v4;            /* Used in the daemon */
 440   uschar address[46];
 441 } ip_address_item;
 442
 443 /* Structure for chaining together arbitrary strings. */
 444
 445 typedef struct string_item {
 446   struct string_item *next;
 447   uschar *text;
 448 } string_item;
 449
 450 /* Information about a soft delivery failure, for use when calculating
 451 retry information. It's separate from the address block, because there
 452 can be a chain of them for SMTP deliveries where multiple IP addresses
 453 can be tried. */
 454
 455 typedef struct retry_item {
 456   struct retry_item *next;        /* for chaining */
 457   uschar *key;                    /* string identifying host/address/message */
 458   int     basic_errno;            /* error code for this destination */
 459   int     more_errno;             /* additional error information */
 460   uschar *message;                /* local error message */
 461   int     flags;                  /* see below */
 462 } retry_item;
 463
 464 /* Retry data flags */
 465
 466 #define rf_delete   0x0001        /* retry info is to be deleted */
 467 #define rf_host     0x0002        /* retry info is for a remote host */
 468 #define rf_message  0x0004        /* retry info is for a host+message */
 469
 470 /* Information about a constructed message that is to be sent using the
 471 autoreply transport. This is pointed to from the address block. */
 472
 473 typedef struct reply_item {
 474   uschar *from;                   /* ) */
 475   uschar *reply_to;               /* ) */
 476   uschar *to;                     /* ) */
 477   uschar *cc;                     /* ) specific header fields */
 478   uschar *bcc;                    /* ) */
 479   uschar *subject;                /* ) */
 480   uschar *headers;                /* misc other headers, concatenated */
 481   uschar *text;                   /* text string body */
 482   uschar *file;                   /* file body */
 483   BOOL    file_expand;            /* expand the body */
 484   int     expand_forbid;          /* expansion lockout flags */
 485   uschar *logfile;                /* file to keep a log in */
 486   uschar *oncelog;                /* file to keep records in for once only */
 487   time_t  once_repeat;            /* time to repeat "once only" */
 488   BOOL    return_message;         /* send back the original message */
 489 } reply_item;
 490
 491
 492 /* The address_item structure contains many fields which are used at various
 493 times while delivering a message. Some are used only for remote deliveries;
 494 some only for local. A particular set of fields is copied whenever a child
 495 address is created. For convenience, we keep those fields in a separate
 496 sub-structure so they can be copied in one go. This also means I won't forget
 497 to edit the various copying places when new to-be-copied fields are added. */
 498
 499 typedef struct address_item_propagated {
 500   uschar *address_data;           /* arbitrary data to keep with the address */
 501   uschar *domain_data;            /* from "domains" lookup */
 502   uschar *localpart_data;         /* from "local_parts" lookup */
 503   uschar *errors_address;         /* where to send errors (NULL => sender) */
 504   header_line *extra_headers;     /* additional headers */
 505   uschar *remove_headers;         /* list of those to remove */
 506
 507   #ifdef EXPERIMENTAL_SRS
 508   uschar *srs_sender;             /* Change return path when delivering */
 509   #endif
 510   BOOL    ignore_error:1;         /* ignore delivery error */
 511   #ifdef SUPPORT_I18N
 512   BOOL    utf8_msg:1;             /* requires SMTPUTF8 processing */
 513   BOOL    utf8_downcvt:1;         /* mandatory downconvert on delivery */
 514   BOOL    utf8_downcvt_maybe:1;   /* optional downconvert on delivery */
 515   #endif
 516 } address_item_propagated;
 517
 518
 519 /* The main address structure. Note that fields that are to be copied to
 520 generated addresses should be put in the address_item_propagated structure (see
 521 above) rather than directly into the address_item structure. */
 522
 523 typedef struct address_item {
 524   struct address_item *next;      /* for chaining addresses */
 525   struct address_item *parent;    /* parent address */
 526   struct address_item *first;     /* points to first after group delivery */
 527   struct address_item *dupof;     /* points to address this is a duplicate of */
 528
 529   router_instance *start_router;  /* generated address starts here */
 530   router_instance *router;        /* the router that routed */
 531   transport_instance *transport;  /* the transport to use */
 532
 533   host_item *host_list;           /* host data for the transport */
 534   host_item *host_used;           /* host that took delivery or failed hard */
 535   host_item *fallback_hosts;      /* to try if delivery defers */
 536
 537   reply_item *reply;              /* data for autoreply */
 538   retry_item *retries;            /* chain of retry information */
 539
 540   uschar *address;                /* address being delivered or routed */
 541   uschar *unique;                 /* used for disambiguating */
 542   uschar *cc_local_part;          /* caseful local part */
 543   uschar *lc_local_part;          /* lowercased local part */
 544   uschar *local_part;             /* points to cc or lc version */
 545   uschar *prefix;                 /* stripped prefix of local part */
 546   uschar *suffix;                 /* stripped suffix of local part */
 547   const uschar *domain;           /* working domain (lower cased) */
 548
 549   uschar *address_retry_key;      /* retry key including full address */
 550   uschar *domain_retry_key;       /* retry key for domain only */
 551
 552   uschar *current_dir;            /* current directory for transporting */
 553   uschar *home_dir;               /* home directory for transporting */
 554   uschar *message;                /* error message */
 555   uschar *user_message;           /* error message that can be sent over SMTP
 556                                      or quoted in bounce message */
 557   uschar *onetime_parent;         /* saved original parent for onetime */
 558   uschar **pipe_expandn;          /* numeric expansions for pipe from filter */
 559   uschar *return_filename;        /* name of return file */
 560   uschar *self_hostname;          /* after self=pass */
 561   uschar *shadow_message;         /* info about shadow transporting */
 562
 563 #ifdef SUPPORT_TLS
 564   uschar *cipher;                 /* Cipher used for transport */
 565   void   *ourcert;                /* Certificate offered to peer, binary */
 566   void   *peercert;               /* Certificate from peer, binary */
 567   uschar *peerdn;                 /* DN of server's certificate */
 568   int    ocsp;                    /* OCSP status of peer cert */
 569 #endif
 570
 571 #ifdef EXPERIMENTAL_DSN_INFO
 572   const uschar *smtp_greeting;    /* peer self-identification */
 573   const uschar *helo_response;    /* peer message */
 574 #endif
 575
 576   uschar *authenticator;          /* auth driver name used by transport */
 577   uschar *auth_id;                /* auth "login" name used by transport */
 578   uschar *auth_sndr;              /* AUTH arg to SMTP MAIL, used by transport */
 579
 580   uschar *dsn_orcpt;              /* DSN orcpt value */
 581   int     dsn_flags;              /* DSN flags */
 582   int     dsn_aware;              /* DSN aware flag */
 583
 584   uid_t   uid;                    /* uid for transporting */
 585   gid_t   gid;                    /* gid for transporting */
 586
 587                                   /* flags */
 588   struct {
 589     BOOL af_allow_file:1;               /* allow file in generated address */
 590     BOOL af_allow_pipe:1;               /* allow pipe in generated address */
 591     BOOL af_allow_reply:1;              /* allow autoreply in generated address */
 592     BOOL af_dr_retry_exists:1;          /* router retry record exists */
 593     BOOL af_expand_pipe:1;              /* expand pipe arguments */
 594     BOOL af_file:1;                     /* file delivery; always with pfr */
 595     BOOL af_gid_set:1;                  /* gid field is set */
 596     BOOL af_home_expanded:1;            /* home_dir is already expanded */
 597     BOOL af_initgroups:1;               /* use initgroups() for local transporting */
 598     BOOL af_local_host_removed:1;       /* local host was backup */
 599     BOOL af_lt_retry_exists:1;          /* local transport retry exists */
 600     BOOL af_pfr:1;                      /* pipe or file or reply delivery */
 601     BOOL af_retry_skipped:1;            /* true if retry caused some skipping */
 602     BOOL af_retry_timedout:1;           /* true if retry timed out */
 603     BOOL af_uid_set:1;                  /* uid field is set */
 604     BOOL af_hide_child:1;               /* hide child in bounce/defer msgs */
 605     BOOL af_sverify_told:1;             /* sender verify failure notified */
 606     BOOL af_verify_pmfail:1;            /* verify failure was postmaster callout */
 607     BOOL af_verify_nsfail:1;            /* verify failure was null sender callout */
 608     BOOL af_homonym:1;                  /* an ancestor has same address */
 609     BOOL af_verify_routed:1;            /* for cached sender verify: routed OK */
 610     BOOL af_verify_callout:1;           /* for cached sender verify: callout was specified */
 611     BOOL af_include_affixes:1;          /* delivered with affixes in RCPT */
 612     BOOL af_cert_verified:1;            /* delivered with verified TLS cert */
 613     BOOL af_pass_message:1;             /* pass message in bounces */
 614     BOOL af_bad_reply:1;                /* filter could not generate autoreply */
 615     BOOL af_tcp_fastopen_conn:1;        /* delivery connection used TCP Fast Open */
 616     BOOL af_tcp_fastopen:1;             /* delivery usefully used TCP Fast Open */
 617     BOOL af_pipelining:1;               /* delivery used (traditional) pipelining */
 618 #ifndef DISABLE_PRDR
 619     BOOL af_prdr_used:1;                /* delivery used SMTP PRDR */
 620 #endif
 621     BOOL af_chunking_used:1;            /* delivery used SMTP CHUNKING */
 622     BOOL af_force_command:1;            /* force_command in pipe transport */
 623 #ifdef SUPPORT_DANE
 624     BOOL af_dane_verified:1;            /* TLS cert verify done with DANE */
 625 #endif
 626 #ifdef SUPPORT_I18N
 627     BOOL af_utf8_downcvt:1;             /* downconvert was done for delivery */
 628 #endif
 629   } flags;
 630
 631   unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
 632   unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
 633   int     mode;                   /* mode for local transporting to a file */
 634   int     more_errno;             /* additional error information */
 635                                   /* (may need to hold a timestamp) */
 636   unsigned int delivery_usec;     /* subsecond part of delivery time */
 637
 638   short int basic_errno;          /* status after failure */
 639   unsigned short child_count;     /* number of child addresses */
 640   short int return_file;          /* fileno of return data file */
 641   short int special_action;       /* ( used when when deferred or failed */
 642                                   /* (  also  */
 643                                   /* ( contains = or - when successful SMTP delivered */
 644                                   /* (  also  */
 645                                   /* ( contains verify rc in sender verify cache */
 646   short int transport_return;     /* result of delivery attempt */
 647   address_item_propagated prop;   /* fields that are propagated to children */
 648 } address_item;
 649
 650 /* The table of header names consists of items of this type */
 651
 652 typedef struct {
 653   uschar *name;
 654   int     len;
 655   BOOL    allow_resent;
 656   int     htype;
 657 } header_name;
 658
 659 /* Chain of information about errors (e.g. bad addresses) */
 660
 661 typedef struct error_block {
 662   struct error_block *next;
 663   const uschar *text1;
 664   uschar *text2;
 665 } error_block;
 666
 667 /* Chain of file names when processing the queue */
 668
 669 typedef struct queue_filename {
 670   struct queue_filename *next;
 671   uschar dir_uschar;
 672   uschar text[1];
 673 } queue_filename;
 674
 675 /* Chain of items of retry information, read from the retry config. */
 676
 677 typedef struct retry_rule {
 678   struct retry_rule *next;
 679   int    rule;
 680   int    timeout;
 681   int    p1;
 682   int    p2;
 683 } retry_rule;
 684
 685 typedef struct retry_config {
 686   struct retry_config *next;
 687   uschar *pattern;
 688   int     basic_errno;
 689   int     more_errno;
 690   uschar *senders;
 691   retry_rule *rules;
 692 } retry_config;
 693
 694 /* Structure for each node in a tree, of which there are various kinds */
 695
 696 typedef struct tree_node {
 697   struct tree_node *left;         /* pointer to left child */
 698   struct tree_node *right;        /* pointer to right child */
 699   union
 700     {
 701     void  *ptr;                   /* pointer to data */
 702     int val;                      /* or integer data */
 703     } data;
 704   uschar  balance;                /* balancing factor */
 705   uschar  name[1];                /* node name - variable length */
 706 } tree_node;
 707
 708 /* Structure for holding time-limited data such as DNS returns.
 709 We use this rather than extending tree_node to avoid wasting
 710 space for most tree use (variables...) at the cost of complexity
 711 for the lookups cache */
 712
 713 typedef struct expiring_data {
 714   time_t expiry;                  /* if nonzero, data invalid after this time */
 715   void   *ptr;                    /* pointer to data */
 716 } expiring_data;
 717
 718 /* Structure for holding the handle and the cached last lookup for searches.
 719 This block is pointed to by the tree entry for the file. The file can get
 720 closed if too many are opened at once. There is a LRU chain for deciding which
 721 to close. */
 722
 723 typedef struct search_cache {
 724   void   *handle;                 /* lookup handle, or NULL if closed */
 725   int search_type;                /* search type */
 726   tree_node *up;                  /* LRU up pointer */
 727   tree_node *down;                /* LRU down pointer */
 728   tree_node *item_cache;          /* tree of cached results */
 729 } search_cache;
 730
 731 /* Structure for holding a partially decoded DNS record; the name has been
 732 uncompressed, but the data pointer is into the raw data. */
 733
 734 typedef struct {
 735   uschar        name[DNS_MAXNAME];      /* domain name */
 736   int           type;                   /* record type */
 737   unsigned short ttl;                   /* time-to-live, seconds */
 738   int           size;                   /* size of data */
 739   const uschar *data;                   /* pointer to data */
 740 } dns_record;
 741
 742 /* Structure for holding the result of a DNS query. */
 743
 744 typedef struct {
 745   int     answerlen;              /* length of the answer */
 746   uschar  answer[MAXPACKET];      /* the answer itself */
 747 } dns_answer;
 748
 749 /* Structure for holding the intermediate data while scanning a DNS answer
 750 block. */
 751
 752 typedef struct {
 753   int            rrcount;         /* count of RRs in the answer */
 754   const uschar *aptr;             /* pointer in the answer while scanning */
 755   dns_record     srr;             /* data from current record in scan */
 756 } dns_scan;
 757
 758 /* Structure for holding a chain of IP addresses that are extracted from
 759 an A, AAAA, or A6 record. For the first two, there is only ever one address,
 760 but the chaining feature of A6 allows for several addresses to be realized from
 761 a single initial A6 record. The structure defines the address field of length
 762 1. In use, a suitable sized block is obtained to hold the complete textual
 763 address. */
 764
 765 typedef struct dns_address {
 766   struct dns_address *next;
 767   uschar  address[1];
 768 } dns_address;
 769
 770 /* Structure used for holding intermediate data during MD5 computations. */
 771
 772 typedef struct md5 {
 773   unsigned int length;
 774   unsigned int abcd[4];
 775   }
 776 md5;
 777
 778 /* Structure used for holding intermediate data during SHA-1 computations. */
 779
 780 typedef struct sha1 {
 781   unsigned int H[5];
 782   unsigned int length;
 783 } sha1;
 784
 785 /* A client-initiated connection. If TLS, the second element is non-NULL */
 786 typedef struct {
 787   int   sock;
 788   void * tls_ctx;
 789 } client_conn_ctx;
 790
 791
 792 /* Structure used to hold incoming packets of SMTP responses for a specific
 793 socket. The packets which may contain multiple lines (and in some cases,
 794 multiple responses). */
 795
 796 typedef struct smtp_inblock {
 797   client_conn_ctx * cctx;         /* the connection */
 798   int     buffersize;             /* the size of the buffer */
 799   uschar *ptr;                    /* current position in the buffer */
 800   uschar *ptrend;                 /* end of data in the buffer */
 801   uschar *buffer;                 /* the buffer itself */
 802 } smtp_inblock;
 803
 804 /* Structure used to hold buffered outgoing packets of SMTP commands for a
 805 specific socket. The packets which may contain multiple lines when pipelining
 806 is in use. */
 807
 808 typedef struct smtp_outblock {
 809   client_conn_ctx * cctx;         /* the connection */
 810   int     cmd_count;              /* count of buffered commands */
 811   int     buffersize;             /* the size of the buffer */
 812   BOOL    authenticating;         /* TRUE when authenticating */
 813   uschar *ptr;                    /* current position in the buffer */
 814   uschar *buffer;                 /* the buffer itself */
 815 } smtp_outblock;
 816
 817 /* Structure to hold information about the source of redirection information */
 818
 819 typedef struct redirect_block {
 820   uschar *string;                 /* file name or string */
 821   uid_t  *owners;                 /* allowed file owners */
 822   gid_t  *owngroups;              /* allowed file groups */
 823   struct passwd *pw;              /* possible owner if not NULL */
 824   int     modemask;               /* forbidden bits */
 825   BOOL    isfile;                 /* TRUE if string is a file name */
 826   BOOL    check_owner;            /* TRUE, FALSE, or TRUE_UNSET */
 827   BOOL    check_group;            /* TRUE, FALSE, or TRUE_UNSET */
 828 } redirect_block;
 829
 830 /* Structure for passing arguments to check_host() */
 831
 832 typedef struct check_host_block {
 833   const uschar *host_name;
 834   const uschar *host_address;
 835   const uschar *host_ipv4;
 836   BOOL   negative;
 837 } check_host_block;
 838
 839 /* Structure for remembering lookup data when caching the result of
 840 a lookup in a named list. */
 841
 842 typedef struct namedlist_cacheblock {
 843   struct namedlist_cacheblock *next;
 844   uschar *key;
 845   uschar *data;
 846 } namedlist_cacheblock;
 847
 848 /* Structure for holding data for an entry in a named list */
 849
 850 typedef struct namedlist_block {
 851   const uschar *string;              /* the list string */
 852   namedlist_cacheblock *cache_data;  /* cached domain_data or localpart_data */
 853   int number;                        /* the number of the list for caching */
 854 } namedlist_block;
 855
 856 /* Structures for Access Control Lists */
 857
 858 typedef struct acl_condition_block {
 859   struct acl_condition_block *next;
 860   uschar *arg;
 861   int type;
 862   union {
 863     BOOL negated;
 864     uschar *varname;
 865   } u;
 866 } acl_condition_block;
 867
 868 typedef struct acl_block {
 869   struct acl_block *next;
 870   acl_condition_block *condition;
 871   int verb;
 872 } acl_block;
 873
 874 /* smtp transport calc outbound_ip */
 875 typedef BOOL (*oicf) (uschar *message_id, void *data);
 876
 877 /* DKIM information for transport */
 878 struct ob_dkim {
 879   uschar *dkim_domain;
 880   uschar *dkim_identity;
 881   uschar *dkim_private_key;
 882   uschar *dkim_selector;
 883   uschar *dkim_canon;
 884   uschar *dkim_sign_headers;
 885   uschar *dkim_strict;
 886   uschar *dkim_hash;
 887   uschar *dkim_timestamps;
 888   BOOL    dot_stuffed;
 889   BOOL    force_bodyhash;
 890 #ifdef EXPERIMENTAL_ARC
 891   uschar *arc_signspec;
 892 #endif
 893 };
 894
 895 /* End of structs.h */