src/src/structs.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2014 */
   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 /* Structure for remembering macros for the configuration file */
  29
  30 typedef struct macro_item {
  31   struct  macro_item *next;
  32   BOOL    command_line;
  33   uschar *replacement;
  34   uschar  name[1];
  35 } macro_item;
  36
  37 /* Structure for bit tables for debugging and logging */
  38
  39 typedef struct bit_table {
  40   uschar *name;
  41   unsigned int bit;
  42 } bit_table;
  43
  44 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
  45
  46 typedef struct ugid_block {
  47   uid_t   uid;
  48   gid_t   gid;
  49   BOOL    uid_set;
  50   BOOL    gid_set;
  51   BOOL    initgroups;
  52 } ugid_block;
  53
  54 /* Structure for holding information about a host for use mainly by routers,
  55 but also used when checking lists of hosts and when transporting. Looking up
  56 host addresses is done using this structure. */
  57
  58 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
  59
  60 typedef struct host_item {
  61   struct host_item *next;
  62   const uschar *name;             /* Host name */
  63   const uschar *address;          /* IP address in text form */
  64   int     port;                   /* port value in host order (if SRV lookup) */
  65   int     mx;                     /* MX value if found via MX records */
  66   int     sort_key;               /* MX*1000 plus random "fraction" */
  67   int     status;                 /* Usable, unusable, or unknown */
  68   int     why;                    /* Why host is unusable */
  69   int     last_try;               /* Time of last try if known */
  70   dnssec_status_t dnssec;
  71 } host_item;
  72
  73 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
  74 rewrite_headers field of a transport. */
  75
  76 typedef struct rewrite_rule {
  77   struct rewrite_rule *next;
  78   int     flags;
  79   uschar *key;
  80   uschar *replacement;
  81 } rewrite_rule;
  82
  83 /* This structure is used to pass back configuration data from the smtp
  84 transport to the outside world. It is used during callback processing. If ever
  85 another remote transport were implemented, it could use the same structure. */
  86
  87 typedef struct transport_feedback {
  88   uschar *interface;
  89   uschar *port;
  90   uschar *protocol;
  91   uschar *hosts;
  92   uschar *helo_data;
  93   BOOL   hosts_override;
  94   BOOL   hosts_randomize;
  95   BOOL   gethostbyname;
  96   BOOL   qualify_single;
  97   BOOL   search_parents;
  98 } transport_feedback;
  99
 100 /* Routers, transports, and authenticators have similar data blocks. Each
 101 driver that is compiled into the code is represented by a xxx_info block; the
 102 active drivers are represented by a chain of xxx_instance blocks. To make it
 103 possible to use the same code for reading the configuration files for all
 104 three, the layout of the start of the blocks is kept the same, and represented
 105 by the generic structures driver_info and driver_instance. */
 106
 107 typedef struct driver_instance {
 108   struct driver_instance *next;
 109   uschar *name;                   /* Instance name */
 110   struct driver_info *info;       /* Points to info for this driver */
 111   void   *options_block;          /* Pointer to private options */
 112   uschar *driver_name;            /* All start with this generic option */
 113 } driver_instance;
 114
 115 typedef struct driver_info {
 116   uschar *driver_name;            /* Name of driver */
 117   optionlist *options;            /* Table of private options names */
 118   int    *options_count;          /* -> Number of entries in table */
 119   void   *options_block;          /* Points to default private block */
 120   int     options_len;            /* Length of same in bytes */
 121   void  (*init)(                  /* Initialization entry point */
 122     struct driver_instance *);
 123 } driver_info;
 124
 125
 126 /* Structure for holding information about the configured transports. Some
 127 of the generally accessible options are set from the configuration file; others
 128 are set by transport initialization, since they can only be set for certain
 129 transports. They need to be generally accessible, however, as they are used by
 130 the main transport code. */
 131
 132 typedef struct transport_instance {
 133   struct transport_instance *next;
 134   uschar *name;                   /* Instance name */
 135   struct transport_info *info;    /* Info for this driver */
 136   void *options_block;            /* Pointer to private options */
 137   uschar *driver_name;            /* Must be first */
 138   int   (*setup)(                 /* Setup entry point */
 139     struct transport_instance *,
 140     struct address_item *,
 141     struct transport_feedback *,  /* For passing back config data */
 142     uid_t,                        /* The uid that will be used */
 143     gid_t,                        /* The gid that will be used */
 144     uschar **);                   /* For an error message */
 145                                   /**************************************/
 146   int     batch_max;              /* )                                  */
 147   uschar *batch_id;               /* )                                  */
 148   uschar *home_dir;               /* ) Used only for local transports   */
 149   uschar *current_dir;            /* )                                  */
 150                                   /**************************************/
 151   uschar *expand_multi_domain;    /* )                                  */
 152   BOOL    multi_domain;           /* )                                  */
 153   BOOL    overrides_hosts;        /* ) Used only for remote transports  */
 154   int     max_addresses;          /* )                                  */
 155   int     connection_max_messages;/* )                                  */
 156                                   /**************************************/
 157   BOOL    deliver_as_creator;     /* Used only by pipe at present */
 158   BOOL    disable_logging;        /* For very weird requirements */
 159   BOOL    initgroups;             /* Initialize groups when setting uid */
 160   BOOL    uid_set;                /* uid is set */
 161   BOOL    gid_set;                /* gid is set */
 162   uid_t   uid;
 163   gid_t   gid;
 164   uschar *expand_uid;             /* Variable uid */
 165   uschar *expand_gid;             /* Variable gid */
 166   uschar *warn_message;           /* Used only by appendfile at present */
 167   uschar *shadow;                 /* Name of shadow transport */
 168   uschar *shadow_condition;       /* Condition for running it */
 169   uschar *filter_command;         /* For on-the-fly-filtering */
 170   uschar *add_headers;            /* Add these headers */
 171   uschar *remove_headers;         /* Remove these headers */
 172   uschar *return_path;            /* Overriding (rewriting) return path */
 173   uschar *debug_string;           /* Debugging output */
 174   uschar *message_size_limit;     /* Biggest message this transport handles */
 175   uschar *headers_rewrite;        /* Rules for rewriting headers */
 176   rewrite_rule *rewrite_rules;    /* Parsed rewriting rules */
 177   int     rewrite_existflags;     /* Bits showing which headers are rewritten */
 178   int     filter_timeout;         /* For transport filter timing */
 179   BOOL    body_only;              /* Deliver only the body */
 180   BOOL    delivery_date_add;      /* Add Delivery-Date header */
 181   BOOL    envelope_to_add;        /* Add Envelope-To header */
 182   BOOL    headers_only;           /* Deliver only the headers */
 183   BOOL    rcpt_include_affixes;   /* TRUE to retain affixes in RCPT commands */
 184   BOOL    return_path_add;        /* Add Return-Path header */
 185   BOOL    return_output;          /* TRUE if output should always be returned */
 186   BOOL    return_fail_output;     /* ditto, but only on failure */
 187   BOOL    log_output;             /* Similarly for logging */
 188   BOOL    log_fail_output;
 189   BOOL    log_defer_output;
 190   BOOL    retry_use_local_part;   /* Defaults true for local, false for remote */
 191 #ifdef EXPERIMENTAL_EVENT
 192   uschar  *event_action;          /* String to expand on notable events */
 193 #endif
 194 } transport_instance;
 195
 196
 197 /* Structure for holding information about a type of transport. The first six
 198 fields must match driver_info above. */
 199
 200 typedef struct transport_info {
 201   uschar *driver_name;            /* Driver name */
 202   optionlist *options;            /* Table of private options names */
 203   int    *options_count;          /* -> Number of entries in table */
 204   void   *options_block;          /* Points to default private block */
 205   int     options_len;            /* Length of same in bytes */
 206   void (*init)(                   /* Initialization function */
 207     struct transport_instance *);
 208 /****/
 209   BOOL (*code)(                   /* Main entry point */
 210     transport_instance *,
 211     struct address_item *);
 212   void (*tidyup)(                 /* Tidyup function */
 213     struct transport_instance *);
 214   void  (*closedown)(             /* For closing down a passed channel */
 215     struct transport_instance *);
 216   BOOL    local;                  /* TRUE for local transports */
 217 } transport_info;
 218
 219
 220
 221 /* Structure for holding information about the configured routers. */
 222
 223 typedef struct router_instance {
 224   struct router_instance *next;
 225   uschar *name;
 226   struct router_info *info;
 227   void   *options_block;          /* Pointer to private options */
 228   uschar *driver_name;            /* Must be first */
 229
 230   uschar *address_data;           /* Arbitrary data */
 231 #ifdef EXPERIMENTAL_BRIGHTMAIL
 232   uschar *bmi_rule;               /* Brightmail AntiSpam rule checking */
 233 #endif
 234   uschar *cannot_route_message;   /* Used when routing fails */
 235   uschar *condition;              /* General condition */
 236   uschar *current_directory;      /* For use during delivery */
 237   uschar *debug_string;           /* Debugging output */
 238   uschar *domains;                /* Specific domains */
 239   uschar *errors_to;              /* Errors address */
 240   uschar *expand_gid;             /* Expanded gid string */
 241   uschar *expand_uid;             /* Expanded uid string */
 242   uschar *expand_more;            /* Expanded more string */
 243   uschar *expand_unseen;          /* Expanded unseen string */
 244   uschar *extra_headers;          /* Additional headers */
 245   uschar *fallback_hosts;         /* For remote transports (text list) */
 246   uschar *home_directory;         /* For use during delivery */
 247   uschar *ignore_target_hosts;    /* Target hosts to ignore */
 248   uschar *local_parts;            /* Specific local parts */
 249   uschar *pass_router_name;       /* Router for passed address */
 250   uschar *prefix;                 /* Address prefix */
 251   uschar *redirect_router_name;   /* Router for generated address */
 252   uschar *remove_headers;         /* Removed headers */
 253   uschar *require_files;          /* File checks before router is run */
 254   uschar *router_home_directory;  /* For use while routing */
 255   uschar *self;                   /* Text option for handling self reference */
 256   uschar *senders;                /* Specific senders */
 257   uschar *suffix;                 /* Address suffix */
 258   uschar *translate_ip_address;   /* IP address translation fudgery */
 259   uschar *transport_name;         /* Transport name */
 260
 261   BOOL    address_test;           /* Use this router when testing addresses */
 262 #ifdef EXPERIMENTAL_BRIGHTMAIL
 263   BOOL    bmi_deliver_alternate;  /* TRUE => BMI said that message should be delivered to alternate location */
 264   BOOL    bmi_deliver_default;    /* TRUE => BMI said that message should be delivered to default location */
 265   BOOL    bmi_dont_deliver;       /* TRUE => BMI said that message should not be delivered at all */
 266 #endif
 267   BOOL    expn;                   /* Use this router when processing EXPN */
 268   BOOL    caseful_local_part;     /* TRUE => don't lowercase */
 269   BOOL    check_local_user;       /* TRUE => check local user */
 270   BOOL    disable_logging;        /* For very weird requirements */
 271   BOOL    fail_verify_recipient;  /* Fail verify if recipient match this router */
 272   BOOL    fail_verify_sender;     /* Fail verify if sender match this router */
 273   BOOL    gid_set;                /* Flag to indicate gid is set */
 274   BOOL    initgroups;             /* TRUE if initgroups is required */
 275   BOOL    log_as_local;           /* TRUE logs as a local delivery */
 276   BOOL    more;                   /* If FALSE, do no more if this one fails */
 277   BOOL    pass_on_timeout;        /* Treat timeout DEFERs as fails */
 278   BOOL    prefix_optional;        /* Just what it says */
 279   BOOL    repeat_use;             /* If FALSE, skip if ancestor used it */
 280   BOOL    retry_use_local_part;   /* Just what it says */
 281   BOOL    same_domain_copy_routing; /* TRUE => copy routing for same domain */
 282   BOOL    self_rewrite;           /* TRUE to rewrite headers if making local */
 283   BOOL    suffix_optional;        /* As it says */
 284   BOOL    verify_only;            /* Skip this router if not verifying */
 285   BOOL    verify_recipient;       /* Use this router when verifying a recipient*/
 286   BOOL    verify_sender;          /* Use this router when verifying a sender */
 287   BOOL    uid_set;                /* Flag to indicate uid is set */
 288   BOOL    unseen;                 /* If TRUE carry on, even after success */
 289   BOOL    dsn_lasthop;            /* If TRUE, this router is a DSN endpoint */
 290
 291   int     self_code;              /* Encoded version of "self" */
 292   uid_t   uid;                    /* Fixed uid value */
 293   gid_t   gid;                    /* Fixed gid value */
 294
 295   host_item *fallback_hostlist;   /* For remote transport (block chain) */
 296   transport_instance *transport;  /* Transport block (when found) */
 297   struct router_instance *pass_router; /* Actual router for passed address */
 298   struct router_instance *redirect_router; /* Actual router for generated address */
 299 } router_instance;
 300
 301
 302 /* Structure for holding information about a type of router. The first six
 303 fields must match driver_info above. */
 304
 305 typedef struct router_info {
 306   uschar *driver_name;
 307   optionlist *options;            /* Table of private options names */
 308   int    *options_count;          /* -> Number of entries in table */
 309   void   *options_block;          /* Points to default private block */
 310   int     options_len;            /* Length of same in bytes */
 311   void (*init)(                   /* Initialization function */
 312     struct router_instance *);
 313 /****/
 314   int (*code)(                    /* Main entry point */
 315     router_instance *,
 316     struct address_item *,
 317     struct passwd *,
 318     int,
 319     struct address_item **,
 320     struct address_item **,
 321     struct address_item **,
 322     struct address_item **);
 323   void (*tidyup)(                 /* Tidyup function */
 324     struct router_instance *);
 325   int     ri_flags;               /* Descriptive flags */
 326 } router_info;
 327
 328
 329 /* Structure for holding information about a lookup type. */
 330
 331 #include "lookupapi.h"
 332
 333
 334 /* Structure for holding information about the configured authentication
 335 mechanisms */
 336
 337 typedef struct auth_instance {
 338   struct auth_instance *next;
 339   uschar *name;                   /* Exim instance name */
 340   struct auth_info *info;         /* Pointer to driver info block */
 341   void   *options_block;          /* Pointer to private options */
 342   uschar *driver_name;            /* Must be first */
 343   uschar *advertise_condition;    /* Are we going to advertise this?*/
 344   uschar *client_condition;       /* Should the client try this? */
 345   uschar *public_name;            /* Advertised name */
 346   uschar *set_id;                 /* String to set when server as authenticated id */
 347   uschar *set_client_id;          /* String to set when client as client_authenticated id */
 348   uschar *mail_auth_condition;    /* Condition for AUTH on MAIL command */
 349   uschar *server_debug_string;    /* Debugging output */
 350   uschar *server_condition;       /* Authorization condition */
 351   BOOL    client;                 /* TRUE if client option(s) set */
 352   BOOL    server;                 /* TRUE if server options(s) set */
 353   BOOL    advertised;             /* Set TRUE when advertised */
 354 } auth_instance;
 355
 356
 357 /* Structure for holding information about an authentication mechanism. The
 358 first six fields must match driver_info above. */
 359
 360 typedef struct auth_info {
 361   uschar *driver_name;            /* e.g. "condition" */
 362   optionlist *options;            /* Table of private options names */
 363   int    *options_count;          /* -> Number of entries in table */
 364   void   *options_block;          /* Points to default private block */
 365   int     options_len;            /* Length of same in bytes */
 366   void (*init)(                   /* initialization function */
 367     struct auth_instance *);
 368 /****/
 369   int (*servercode)(              /* server function */
 370     auth_instance *,              /* the instance data */
 371     uschar *);                    /* rest of AUTH command */
 372   int (*clientcode)(              /* client function */
 373     struct auth_instance *,
 374     struct smtp_inblock *,        /* socket and input buffer */
 375     struct smtp_outblock *,       /* socket and output buffer */
 376     int,                          /* command timeout */
 377     uschar *,                     /* buffer for reading response */
 378     int);                         /* sizeof buffer */
 379   void (*version_report)(         /* diagnostic version reporting */
 380     FILE *);                      /* I/O stream to print to */
 381 } auth_info;
 382
 383
 384 /* Structure for holding a single IP address and port; used for the chain of
 385 addresses and ports for the local host. Make the char string large enough to
 386 hold an IPv6 address. */
 387
 388 typedef struct ip_address_item {
 389   struct ip_address_item *next;
 390   int    port;
 391   BOOL   v6_include_v4;            /* Used in the daemon */
 392   uschar address[46];
 393 } ip_address_item;
 394
 395 /* Structure for chaining together arbitrary strings. */
 396
 397 typedef struct string_item {
 398   struct string_item *next;
 399   uschar *text;
 400 } string_item;
 401
 402 /* Information about a soft delivery failure, for use when calculating
 403 retry information. It's separate from the address block, because there
 404 can be a chain of them for SMTP deliveries where multiple IP addresses
 405 can be tried. */
 406
 407 typedef struct retry_item {
 408   struct retry_item *next;        /* for chaining */
 409   uschar *key;                    /* string identifying host/address/message */
 410   int     basic_errno;            /* error code for this destination */
 411   int     more_errno;             /* additional error information */
 412   uschar *message;                /* local error message */
 413   int     flags;                  /* see below */
 414 } retry_item;
 415
 416 /* Retry data flags */
 417
 418 #define rf_delete   0x0001        /* retry info is to be deleted */
 419 #define rf_host     0x0002        /* retry info is for a remote host */
 420 #define rf_message  0x0004        /* retry info is for a host+message */
 421
 422 /* Information about a constructed message that is to be sent using the
 423 autoreply transport. This is pointed to from the address block. */
 424
 425 typedef struct reply_item {
 426   uschar *from;                   /* ) */
 427   uschar *reply_to;               /* ) */
 428   uschar *to;                     /* ) */
 429   uschar *cc;                     /* ) specific header fields */
 430   uschar *bcc;                    /* ) */
 431   uschar *subject;                /* ) */
 432   uschar *headers;                /* misc other headers, concatenated */
 433   uschar *text;                   /* text string body */
 434   uschar *file;                   /* file body */
 435   BOOL    file_expand;            /* expand the body */
 436   int     expand_forbid;          /* expansion lockout flags */
 437   uschar *logfile;                /* file to keep a log in */
 438   uschar *oncelog;                /* file to keep records in for once only */
 439   time_t  once_repeat;            /* time to repeat "once only" */
 440   BOOL    return_message;         /* send back the original message */
 441 } reply_item;
 442
 443
 444 /* The address_item structure contains many fields which are used at various
 445 times while delivering a message. Some are used only for remote deliveries;
 446 some only for local. A particular set of fields is copied whenever a child
 447 address is created. For convenience, we keep those fields in a separate
 448 sub-structure so they can be copied in one go. This also means I won't forget
 449 to edit the various copying places when new to-be-copied fields are added. */
 450
 451 typedef struct address_item_propagated {
 452   uschar *address_data;           /* arbitrary data to keep with the address */
 453   uschar *domain_data;            /* from "domains" lookup */
 454   uschar *localpart_data;         /* from "local_parts" lookup */
 455   uschar *errors_address;         /* where to send errors (NULL => sender) */
 456   header_line *extra_headers;     /* additional headers */
 457   uschar *remove_headers;         /* list of those to remove */
 458
 459   #ifdef EXPERIMENTAL_SRS
 460   uschar *srs_sender;             /* Change return path when delivering */
 461   #endif
 462   #ifdef EXPERIMENTAL_INTERNATIONAL
 463   BOOL    utf8;                   /* requires SMTPUTF8 processing */
 464   #endif
 465 } address_item_propagated;
 466
 467 /* Bits for the flags field below */
 468
 469 #define af_allow_file          0x00000001 /* allow file in generated address */
 470 #define af_allow_pipe          0x00000002 /* allow pipe in generated address */
 471 #define af_allow_reply         0x00000004 /* allow autoreply in generated address */
 472 #define af_dr_retry_exists     0x00000008 /* router retry record exists */
 473 #define af_expand_pipe         0x00000010 /* expand pipe arguments */
 474 #define af_file                0x00000020 /* file delivery; always with pfr */
 475 #define af_gid_set             0x00000040 /* gid field is set */
 476 #define af_home_expanded       0x00000080 /* home_dir is already expanded */
 477 #define af_ignore_error        0x00000100 /* ignore delivery error */
 478 #define af_initgroups          0x00000200 /* use initgroups() for local transporting */
 479 #define af_local_host_removed  0x00000400 /* local host was backup */
 480 #define af_lt_retry_exists     0x00000800 /* local transport retry exists */
 481 #define af_pfr                 0x00001000 /* pipe or file or reply delivery */
 482 #define af_retry_skipped       0x00002000 /* true if retry caused some skipping */
 483 #define af_retry_timedout      0x00004000 /* true if retry timed out */
 484 #define af_uid_set             0x00008000 /* uid field is set */
 485 #define af_hide_child          0x00010000 /* hide child in bounce/defer msgs */
 486 #define af_sverify_told        0x00020000 /* sender verify failure notified */
 487 #define af_verify_pmfail       0x00040000 /* verify failure was postmaster callout */
 488 #define af_verify_nsfail       0x00080000 /* verify failure was null sender callout */
 489 #define af_homonym             0x00100000 /* an ancestor has same address */
 490 #define af_verify_routed       0x00200000 /* for cached sender verify: routed OK */
 491 #define af_verify_callout      0x00400000 /* for cached sender verify: callout was specified */
 492 #define af_include_affixes     0x00800000 /* delivered with affixes in RCPT */
 493 #define af_cert_verified       0x01000000 /* delivered with verified TLS cert */
 494 #define af_pass_message        0x02000000 /* pass message in bounces */
 495 #define af_bad_reply           0x04000000 /* filter could not generate autoreply */
 496 #ifndef DISABLE_PRDR
 497 # define af_prdr_used          0x08000000 /* delivery used SMTP PRDR */
 498 #endif
 499 #define af_force_command       0x10000000 /* force_command in pipe transport */
 500 #ifdef EXPERIMENTAL_DANE
 501 # define af_dane_verified      0x20000000 /* TLS cert verify done with DANE */
 502 #endif
 503
 504 /* These flags must be propagated when a child is created */
 505
 506 #define af_propagate           (af_ignore_error)
 507
 508 /* The main address structure. Note that fields that are to be copied to
 509 generated addresses should be put in the address_item_propagated structure (see
 510 above) rather than directly into the address_item structure. */
 511
 512 typedef struct address_item {
 513   struct address_item *next;      /* for chaining addresses */
 514   struct address_item *parent;    /* parent address */
 515   struct address_item *first;     /* points to first after group delivery */
 516   struct address_item *dupof;     /* points to address this is a duplicate of */
 517
 518   router_instance *start_router;  /* generated address starts here */
 519   router_instance *router;        /* the router that routed */
 520   transport_instance *transport;  /* the transport to use */
 521
 522   host_item *host_list;           /* host data for the transport */
 523   host_item *host_used;           /* host that took delivery or failed hard */
 524   host_item *fallback_hosts;      /* to try if delivery defers */
 525
 526   reply_item *reply;              /* data for autoreply */
 527   retry_item *retries;            /* chain of retry information */
 528
 529   uschar *address;                /* address being delivered or routed */
 530   uschar *unique;                 /* used for disambiguating */
 531   uschar *cc_local_part;          /* caseful local part */
 532   uschar *lc_local_part;          /* lowercased local part */
 533   uschar *local_part;             /* points to cc or lc version */
 534   uschar *prefix;                 /* stripped prefix of local part */
 535   uschar *suffix;                 /* stripped suffix of local part */
 536   const uschar *domain;           /* working domain (lower cased) */
 537
 538   uschar *address_retry_key;      /* retry key including full address */
 539   uschar *domain_retry_key;       /* retry key for domain only */
 540
 541   uschar *current_dir;            /* current directory for transporting */
 542   uschar *home_dir;               /* home directory for transporting */
 543   uschar *message;                /* error message */
 544   uschar *user_message;           /* error message that can be sent over SMTP
 545                                      or quoted in bounce message */
 546   uschar *onetime_parent;         /* saved original parent for onetime */
 547   uschar **pipe_expandn;          /* numeric expansions for pipe from filter */
 548   uschar *return_filename;        /* name of return file */
 549   uschar *self_hostname;          /* after self=pass */
 550   uschar *shadow_message;         /* info about shadow transporting */
 551
 552   #ifdef SUPPORT_TLS
 553   uschar *cipher;                 /* Cipher used for transport */
 554   void   *ourcert;                /* Certificate offered to peer, binary */
 555   void   *peercert;               /* Certificate from peer, binary */
 556   uschar *peerdn;                 /* DN of server's certificate */
 557   int    ocsp;                    /* OCSP status of peer cert */
 558   #endif
 559
 560   uschar *authenticator;          /* auth driver name used by transport */
 561   uschar *auth_id;                /* auth "login" name used by transport */
 562   uschar *auth_sndr;              /* AUTH arg to SMTP MAIL, used by transport */
 563
 564   uschar *dsn_orcpt;              /* DSN orcpt value */
 565   int     dsn_flags;              /* DSN flags */
 566   int     dsn_aware;              /* DSN aware flag */
 567
 568   uid_t   uid;                    /* uid for transporting */
 569   gid_t   gid;                    /* gid for transporting */
 570
 571   unsigned int flags;             /* a row of bits, defined above */
 572   unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
 573   unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
 574   int     mode;                   /* mode for local transporting to a file */
 575   int     more_errno;             /* additional error information */
 576                                   /* (may need to hold a timestamp) */
 577
 578   short int basic_errno;          /* status after failure */
 579   short int child_count;          /* number of child addresses */
 580   short int return_file;          /* fileno of return data file */
 581   short int special_action;       /* ( used when when deferred or failed */
 582                                   /* (  also  */
 583                                   /* ( contains = or - when successful SMTP delivered */
 584                                   /* (  also  */
 585                                   /* ( contains verify rc in sender verify cache */
 586   short int transport_return;     /* result of delivery attempt */
 587   address_item_propagated prop;   /* fields that are propagated to children */
 588 } address_item;
 589
 590 /* The table of header names consists of items of this type */
 591
 592 typedef struct {
 593   uschar *name;
 594   int     len;
 595   BOOL    allow_resent;
 596   int     htype;
 597 } header_name;
 598
 599 /* Chain of information about errors (e.g. bad addresses) */
 600
 601 typedef struct error_block {
 602   struct error_block *next;
 603   const uschar *text1;
 604   uschar *text2;
 605 } error_block;
 606
 607 /* Chain of file names when processing the queue */
 608
 609 typedef struct queue_filename {
 610   struct queue_filename *next;
 611   uschar dir_uschar;
 612   uschar text[1];
 613 } queue_filename;
 614
 615 /* Chain of items of retry information, read from the retry config. */
 616
 617 typedef struct retry_rule {
 618   struct retry_rule *next;
 619   int    rule;
 620   int    timeout;
 621   int    p1;
 622   int    p2;
 623 } retry_rule;
 624
 625 typedef struct retry_config {
 626   struct retry_config *next;
 627   uschar *pattern;
 628   int     basic_errno;
 629   int     more_errno;
 630   uschar *senders;
 631   retry_rule *rules;
 632 } retry_config;
 633
 634 /* Structure for each node in a tree, of which there are various kinds */
 635
 636 typedef struct tree_node {
 637   struct tree_node *left;         /* pointer to left child */
 638   struct tree_node *right;        /* pointer to right child */
 639   union
 640     {
 641     void  *ptr;                   /* pointer to data */
 642     int val;                      /* or integer data */
 643     } data;
 644   uschar  balance;                /* balancing factor */
 645   uschar  name[1];                /* node name - variable length */
 646 } tree_node;
 647
 648 /* Structure for holding the handle and the cached last lookup for searches.
 649 This block is pointed to by the tree entry for the file. The file can get
 650 closed if too many are opened at once. There is a LRU chain for deciding which
 651 to close. */
 652
 653 typedef struct search_cache {
 654   void   *handle;                 /* lookup handle, or NULL if closed */
 655   int search_type;                /* search type */
 656   tree_node *up;                  /* LRU up pointer */
 657   tree_node *down;                /* LRU down pointer */
 658   tree_node *item_cache;          /* tree of cached results */
 659 } search_cache;
 660
 661 /* Structure for holding a partially decoded DNS record; the name has been
 662 uncompressed, but the data pointer is into the raw data. */
 663
 664 typedef struct {
 665   uschar  name[DNS_MAXNAME];      /* domain name */
 666   int     type;                   /* record type */
 667   int     size;                   /* size of data */
 668   uschar *data;                   /* pointer to data */
 669 } dns_record;
 670
 671 /* Structure for holding the result of a DNS query. */
 672
 673 typedef struct {
 674   int     answerlen;              /* length of the answer */
 675   uschar  answer[MAXPACKET];      /* the answer itself */
 676 } dns_answer;
 677
 678 /* Structure for holding the intermediate data while scanning a DNS answer
 679 block. */
 680
 681 typedef struct {
 682   int     rrcount;                /* count of RRs in the answer */
 683   uschar *aptr;                   /* pointer in the answer while scanning */
 684   dns_record srr;                 /* data from current record in scan */
 685 } dns_scan;
 686
 687 /* Structure for holding a chain of IP addresses that are extracted from
 688 an A, AAAA, or A6 record. For the first two, there is only ever one address,
 689 but the chaining feature of A6 allows for several addresses to be realized from
 690 a single initial A6 record. The structure defines the address field of length
 691 1. In use, a suitable sized block is obtained to hold the complete textual
 692 address. */
 693
 694 typedef struct dns_address {
 695   struct dns_address *next;
 696   uschar  address[1];
 697 } dns_address;
 698
 699 /* Structure used for holding intermediate data during MD5 computations. */
 700
 701 typedef struct md5 {
 702   unsigned int length;
 703   unsigned int abcd[4];
 704   }
 705 md5;
 706
 707 /* Structure used for holding intermediate data during SHA-1 computations. */
 708
 709 typedef struct sha1 {
 710   unsigned int H[5];
 711   unsigned int length;
 712   }
 713 sha1;
 714
 715 /* Structure used to hold incoming packets of SMTP responses for a specific
 716 socket. The packets which may contain multiple lines (and in some cases,
 717 multiple responses). */
 718
 719 typedef struct smtp_inblock {
 720   int     sock;                   /* the socket */
 721   int     buffersize;             /* the size of the buffer */
 722   uschar *ptr;                    /* current position in the buffer */
 723   uschar *ptrend;                 /* end of data in the buffer */
 724   uschar *buffer;                 /* the buffer itself */
 725 } smtp_inblock;
 726
 727 /* Structure used to hold buffered outgoing packets of SMTP commands for a
 728 specific socket. The packets which may contain multiple lines when pipelining
 729 is in use. */
 730
 731 typedef struct smtp_outblock {
 732   int     sock;                   /* the socket */
 733   int     cmd_count;              /* count of buffered commands */
 734   int     buffersize;             /* the size of the buffer */
 735   BOOL    authenticating;         /* TRUE when authenticating */
 736   uschar *ptr;                    /* current position in the buffer */
 737   uschar *buffer;                 /* the buffer itself */
 738 } smtp_outblock;
 739
 740 /* Structure to hold information about the source of redirection information */
 741
 742 typedef struct redirect_block {
 743   uschar *string;                 /* file name or string */
 744   uid_t  *owners;                 /* allowed file owners */
 745   gid_t  *owngroups;              /* allowed file groups */
 746   struct passwd *pw;              /* possible owner if not NULL */
 747   int     modemask;               /* forbidden bits */
 748   BOOL    isfile;                 /* TRUE if string is a file name */
 749   BOOL    check_owner;            /* TRUE, FALSE, or TRUE_UNSET */
 750   BOOL    check_group;            /* TRUE, FALSE, or TRUE_UNSET */
 751 } redirect_block;
 752
 753 /* Structure for passing arguments to check_host() */
 754
 755 typedef struct check_host_block {
 756   const uschar *host_name;
 757   const uschar *host_address;
 758   const uschar *host_ipv4;
 759   BOOL   negative;
 760 } check_host_block;
 761
 762 /* Structure for remembering lookup data when caching the result of
 763 a lookup in a named list. */
 764
 765 typedef struct namedlist_cacheblock {
 766   struct namedlist_cacheblock *next;
 767   uschar *key;
 768   uschar *data;
 769 } namedlist_cacheblock;
 770
 771 /* Structure for holding data for an entry in a named list */
 772
 773 typedef struct namedlist_block {
 774   const uschar *string;              /* the list string */
 775   namedlist_cacheblock *cache_data;  /* cached domain_data or localpart_data */
 776   int number;                        /* the number of the list for caching */
 777 } namedlist_block;
 778
 779 /* Structures for Access Control Lists */
 780
 781 typedef struct acl_condition_block {
 782   struct acl_condition_block *next;
 783   uschar *arg;
 784   int type;
 785   union {
 786     BOOL negated;
 787     uschar *varname;
 788   } u;
 789 } acl_condition_block;
 790
 791 typedef struct acl_block {
 792   struct acl_block *next;
 793   acl_condition_block *condition;
 794   int verb;
 795 } acl_block;
 796
 797 /* smtp transport calc outbound_ip */
 798 typedef BOOL (*oicf) (uschar *message_id, void *data);
 799
 800 /* End of structs.h */