src/src/structs.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2015 */
   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   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 typedef enum {CHUNKING_NOT_OFFERED, CHUNKING_OFFERED, CHUNKING_ACTIVE, CHUNKING_LAST} chunking_state_t;
  55
  56 /* Structure for holding information about a host for use mainly by routers,
  57 but also used when checking lists of hosts and when transporting. Looking up
  58 host addresses is done using this structure. */
  59
  60 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
  61
  62 typedef struct host_item {
  63   struct host_item *next;
  64   const uschar *name;             /* Host name */
  65   const uschar *address;          /* IP address in text form */
  66   int     port;                   /* port value in host order (if SRV lookup) */
  67   int     mx;                     /* MX value if found via MX records */
  68   int     sort_key;               /* MX*1000 plus random "fraction" */
  69   int     status;                 /* Usable, unusable, or unknown */
  70   int     why;                    /* Why host is unusable */
  71   int     last_try;               /* Time of last try if known */
  72   dnssec_status_t dnssec;
  73 } host_item;
  74
  75 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
  76 rewrite_headers field of a transport. */
  77
  78 typedef struct rewrite_rule {
  79   struct rewrite_rule *next;
  80   int     flags;
  81   uschar *key;
  82   uschar *replacement;
  83 } rewrite_rule;
  84
  85 /* This structure is used to pass back configuration data from the smtp
  86 transport to the outside world. It is used during callback processing. If ever
  87 another remote transport were implemented, it could use the same structure. */
  88
  89 typedef struct transport_feedback {
  90   uschar *interface;
  91   uschar *port;
  92   uschar *protocol;
  93   uschar *hosts;
  94   uschar *helo_data;
  95   BOOL   hosts_override;
  96   BOOL   hosts_randomize;
  97   BOOL   gethostbyname;
  98   BOOL   qualify_single;
  99   BOOL   search_parents;
 100 } transport_feedback;
 101
 102 /* Routers, transports, and authenticators have similar data blocks. Each
 103 driver that is compiled into the code is represented by a xxx_info block; the
 104 active drivers are represented by a chain of xxx_instance blocks. To make it
 105 possible to use the same code for reading the configuration files for all
 106 three, the layout of the start of the blocks is kept the same, and represented
 107 by the generic structures driver_info and driver_instance. */
 108
 109 typedef struct driver_instance {
 110   struct driver_instance *next;
 111   uschar *name;                   /* Instance name */
 112   struct driver_info *info;       /* Points to info for this driver */
 113   void   *options_block;          /* Pointer to private options */
 114   uschar *driver_name;            /* All start with this generic option */
 115 } driver_instance;
 116
 117 typedef struct driver_info {
 118   uschar *driver_name;            /* Name of driver */
 119   optionlist *options;            /* Table of private options names */
 120   int    *options_count;          /* -> Number of entries in table */
 121   void   *options_block;          /* Points to default private block */
 122   int     options_len;            /* Length of same in bytes */
 123   void  (*init)(                  /* Initialization entry point */
 124     struct driver_instance *);
 125 } driver_info;
 126
 127
 128 /* Structure for holding information about the configured transports. Some
 129 of the generally accessible options are set from the configuration file; others
 130 are set by transport initialization, since they can only be set for certain
 131 transports. They need to be generally accessible, however, as they are used by
 132 the main transport code. */
 133
 134 typedef struct transport_instance {
 135   struct transport_instance *next;
 136   uschar *name;                   /* Instance name */
 137   struct transport_info *info;    /* Info for this driver */
 138   void *options_block;            /* Pointer to private options */
 139   uschar *driver_name;            /* Must be first */
 140   int   (*setup)(                 /* Setup entry point */
 141     struct transport_instance *,
 142     struct address_item *,
 143     struct transport_feedback *,  /* For passing back config data */
 144     uid_t,                        /* The uid that will be used */
 145     gid_t,                        /* The gid that will be used */
 146     uschar **);                   /* For an error message */
 147                                   /**************************************/
 148   int     batch_max;              /* )                                  */
 149   uschar *batch_id;               /* )                                  */
 150   uschar *home_dir;               /* ) Used only for local transports   */
 151   uschar *current_dir;            /* )                                  */
 152                                   /**************************************/
 153   uschar *expand_multi_domain;    /* )                                  */
 154   BOOL    multi_domain;           /* )                                  */
 155   BOOL    overrides_hosts;        /* ) Used only for remote transports  */
 156   int     max_addresses;          /* )                                  */
 157   int     connection_max_messages;/* )                                  */
 158                                   /**************************************/
 159   BOOL    deliver_as_creator;     /* Used only by pipe at present */
 160   BOOL    disable_logging;        /* For very weird requirements */
 161   BOOL    initgroups;             /* Initialize groups when setting uid */
 162   BOOL    uid_set;                /* uid is set */
 163   BOOL    gid_set;                /* gid is set */
 164   uid_t   uid;
 165   gid_t   gid;
 166   uschar *expand_uid;             /* Variable uid */
 167   uschar *expand_gid;             /* Variable gid */
 168   uschar *warn_message;           /* Used only by appendfile at present */
 169   uschar *shadow;                 /* Name of shadow transport */
 170   uschar *shadow_condition;       /* Condition for running it */
 171   uschar *filter_command;         /* For on-the-fly-filtering */
 172   uschar *add_headers;            /* Add these headers */
 173   uschar *remove_headers;         /* Remove these headers */
 174   uschar *return_path;            /* Overriding (rewriting) return path */
 175   uschar *debug_string;           /* Debugging output */
 176   uschar *max_parallel;           /* Number of concurrent instances */
 177   uschar *message_size_limit;     /* Biggest message this transport handles */
 178   uschar *headers_rewrite;        /* Rules for rewriting headers */
 179   rewrite_rule *rewrite_rules;    /* Parsed rewriting rules */
 180   int     rewrite_existflags;     /* Bits showing which headers are rewritten */
 181   int     filter_timeout;         /* For transport filter timing */
 182   BOOL    body_only;              /* Deliver only the body */
 183   BOOL    delivery_date_add;      /* Add Delivery-Date header */
 184   BOOL    envelope_to_add;        /* Add Envelope-To header */
 185   BOOL    headers_only;           /* Deliver only the headers */
 186   BOOL    rcpt_include_affixes;   /* TRUE to retain affixes in RCPT commands */
 187   BOOL    return_path_add;        /* Add Return-Path header */
 188   BOOL    return_output;          /* TRUE if output should always be returned */
 189   BOOL    return_fail_output;     /* ditto, but only on failure */
 190   BOOL    log_output;             /* Similarly for logging */
 191   BOOL    log_fail_output;
 192   BOOL    log_defer_output;
 193   BOOL    retry_use_local_part;   /* Defaults true for local, false for remote */
 194 #ifndef DISABLE_EVENT
 195   uschar  *event_action;          /* String to expand on notable events */
 196 #endif
 197 } transport_instance;
 198
 199
 200 /* Structure for holding information about a type of transport. The first six
 201 fields must match driver_info above. */
 202
 203 typedef struct transport_info {
 204   uschar *driver_name;            /* Driver name */
 205   optionlist *options;            /* Table of private options names */
 206   int    *options_count;          /* -> Number of entries in table */
 207   void   *options_block;          /* Points to default private block */
 208   int     options_len;            /* Length of same in bytes */
 209   void (*init)(                   /* Initialization function */
 210     struct transport_instance *);
 211 /****/
 212   BOOL (*code)(                   /* Main entry point */
 213     transport_instance *,
 214     struct address_item *);
 215   void (*tidyup)(                 /* Tidyup function */
 216     struct transport_instance *);
 217   void  (*closedown)(             /* For closing down a passed channel */
 218     struct transport_instance *);
 219   BOOL    local;                  /* TRUE for local transports */
 220 } transport_info;
 221
 222
 223
 224 typedef struct {
 225   uschar *request;
 226   uschar *require;
 227 } dnssec_domains;
 228
 229 /* Structure for holding information about the configured routers. */
 230
 231 typedef struct router_instance {
 232   struct router_instance *next;
 233   uschar *name;
 234   struct router_info *info;
 235   void   *options_block;          /* Pointer to private options */
 236   uschar *driver_name;            /* Must be first */
 237
 238   uschar *address_data;           /* Arbitrary data */
 239 #ifdef EXPERIMENTAL_BRIGHTMAIL
 240   uschar *bmi_rule;               /* Brightmail AntiSpam rule checking */
 241 #endif
 242   uschar *cannot_route_message;   /* Used when routing fails */
 243   uschar *condition;              /* General condition */
 244   uschar *current_directory;      /* For use during delivery */
 245   uschar *debug_string;           /* Debugging output */
 246   uschar *domains;                /* Specific domains */
 247   uschar *errors_to;              /* Errors address */
 248   uschar *expand_gid;             /* Expanded gid string */
 249   uschar *expand_uid;             /* Expanded uid string */
 250   uschar *expand_more;            /* Expanded more string */
 251   uschar *expand_unseen;          /* Expanded unseen string */
 252   uschar *extra_headers;          /* Additional headers */
 253   uschar *fallback_hosts;         /* For remote transports (text list) */
 254   uschar *home_directory;         /* For use during delivery */
 255   uschar *ignore_target_hosts;    /* Target hosts to ignore */
 256   uschar *local_parts;            /* Specific local parts */
 257   uschar *pass_router_name;       /* Router for passed address */
 258   uschar *prefix;                 /* Address prefix */
 259   uschar *redirect_router_name;   /* Router for generated address */
 260   uschar *remove_headers;         /* Removed headers */
 261   uschar *require_files;          /* File checks before router is run */
 262   uschar *router_home_directory;  /* For use while routing */
 263   uschar *self;                   /* Text option for handling self reference */
 264   uschar *senders;                /* Specific senders */
 265   uschar *suffix;                 /* Address suffix */
 266   uschar *translate_ip_address;   /* IP address translation fudgery */
 267   uschar *transport_name;         /* Transport name */
 268
 269   BOOL    address_test;           /* Use this router when testing addresses */
 270 #ifdef EXPERIMENTAL_BRIGHTMAIL
 271   BOOL    bmi_deliver_alternate;  /* TRUE => BMI said that message should be delivered to alternate location */
 272   BOOL    bmi_deliver_default;    /* TRUE => BMI said that message should be delivered to default location */
 273   BOOL    bmi_dont_deliver;       /* TRUE => BMI said that message should not be delivered at all */
 274 #endif
 275   BOOL    expn;                   /* Use this router when processing EXPN */
 276   BOOL    caseful_local_part;     /* TRUE => don't lowercase */
 277   BOOL    check_local_user;       /* TRUE => check local user */
 278   BOOL    disable_logging;        /* For very weird requirements */
 279   BOOL    fail_verify_recipient;  /* Fail verify if recipient match this router */
 280   BOOL    fail_verify_sender;     /* Fail verify if sender match this router */
 281   BOOL    gid_set;                /* Flag to indicate gid is set */
 282   BOOL    initgroups;             /* TRUE if initgroups is required */
 283   BOOL    log_as_local;           /* TRUE logs as a local delivery */
 284   BOOL    more;                   /* If FALSE, do no more if this one fails */
 285   BOOL    pass_on_timeout;        /* Treat timeout DEFERs as fails */
 286   BOOL    prefix_optional;        /* Just what it says */
 287   BOOL    repeat_use;             /* If FALSE, skip if ancestor used it */
 288   BOOL    retry_use_local_part;   /* Just what it says */
 289   BOOL    same_domain_copy_routing; /* TRUE => copy routing for same domain */
 290   BOOL    self_rewrite;           /* TRUE to rewrite headers if making local */
 291   BOOL    suffix_optional;        /* As it says */
 292   BOOL    verify_only;            /* Skip this router if not verifying */
 293   BOOL    verify_recipient;       /* Use this router when verifying a recipient*/
 294   BOOL    verify_sender;          /* Use this router when verifying a sender */
 295   BOOL    uid_set;                /* Flag to indicate uid is set */
 296   BOOL    unseen;                 /* If TRUE carry on, even after success */
 297   BOOL    dsn_lasthop;            /* If TRUE, this router is a DSN endpoint */
 298
 299   int     self_code;              /* Encoded version of "self" */
 300   uid_t   uid;                    /* Fixed uid value */
 301   gid_t   gid;                    /* Fixed gid value */
 302
 303   host_item *fallback_hostlist;   /* For remote transport (block chain) */
 304   transport_instance *transport;  /* Transport block (when found) */
 305   struct router_instance *pass_router; /* Actual router for passed address */
 306   struct router_instance *redirect_router; /* Actual router for generated address */
 307
 308   dnssec_domains dnssec;
 309 } router_instance;
 310
 311
 312 /* Structure for holding information about a type of router. The first six
 313 fields must match driver_info above. */
 314
 315 typedef struct router_info {
 316   uschar *driver_name;
 317   optionlist *options;            /* Table of private options names */
 318   int    *options_count;          /* -> Number of entries in table */
 319   void   *options_block;          /* Points to default private block */
 320   int     options_len;            /* Length of same in bytes */
 321   void (*init)(                   /* Initialization function */
 322     struct router_instance *);
 323 /****/
 324   int (*code)(                    /* Main entry point */
 325     router_instance *,
 326     struct address_item *,
 327     struct passwd *,
 328     int,
 329     struct address_item **,
 330     struct address_item **,
 331     struct address_item **,
 332     struct address_item **);
 333   void (*tidyup)(                 /* Tidyup function */
 334     struct router_instance *);
 335   int     ri_flags;               /* Descriptive flags */
 336 } router_info;
 337
 338
 339 /* Structure for holding information about a lookup type. */
 340
 341 #include "lookupapi.h"
 342
 343
 344 /* Structure for holding information about the configured authentication
 345 mechanisms */
 346
 347 typedef struct auth_instance {
 348   struct auth_instance *next;
 349   uschar *name;                   /* Exim instance name */
 350   struct auth_info *info;         /* Pointer to driver info block */
 351   void   *options_block;          /* Pointer to private options */
 352   uschar *driver_name;            /* Must be first */
 353   uschar *advertise_condition;    /* Are we going to advertise this?*/
 354   uschar *client_condition;       /* Should the client try this? */
 355   uschar *public_name;            /* Advertised name */
 356   uschar *set_id;                 /* String to set when server as authenticated id */
 357   uschar *set_client_id;          /* String to set when client as client_authenticated id */
 358   uschar *mail_auth_condition;    /* Condition for AUTH on MAIL command */
 359   uschar *server_debug_string;    /* Debugging output */
 360   uschar *server_condition;       /* Authorization condition */
 361   BOOL    client;                 /* TRUE if client option(s) set */
 362   BOOL    server;                 /* TRUE if server options(s) set */
 363   BOOL    advertised;             /* Set TRUE when advertised */
 364 } auth_instance;
 365
 366
 367 /* Structure for holding information about an authentication mechanism. The
 368 first six fields must match driver_info above. */
 369
 370 typedef struct auth_info {
 371   uschar *driver_name;            /* e.g. "condition" */
 372   optionlist *options;            /* Table of private options names */
 373   int    *options_count;          /* -> Number of entries in table */
 374   void   *options_block;          /* Points to default private block */
 375   int     options_len;            /* Length of same in bytes */
 376   void (*init)(                   /* initialization function */
 377     struct auth_instance *);
 378 /****/
 379   int (*servercode)(              /* server function */
 380     auth_instance *,              /* the instance data */
 381     uschar *);                    /* rest of AUTH command */
 382   int (*clientcode)(              /* client function */
 383     struct auth_instance *,
 384     struct smtp_inblock *,        /* socket and input buffer */
 385     struct smtp_outblock *,       /* socket and output buffer */
 386     int,                          /* command timeout */
 387     uschar *,                     /* buffer for reading response */
 388     int);                         /* sizeof buffer */
 389   void (*version_report)(         /* diagnostic version reporting */
 390     FILE *);                      /* I/O stream to print to */
 391 } auth_info;
 392
 393
 394 /* Structure for holding a single IP address and port; used for the chain of
 395 addresses and ports for the local host. Make the char string large enough to
 396 hold an IPv6 address. */
 397
 398 typedef struct ip_address_item {
 399   struct ip_address_item *next;
 400   int    port;
 401   BOOL   v6_include_v4;            /* Used in the daemon */
 402   uschar address[46];
 403 } ip_address_item;
 404
 405 /* Structure for chaining together arbitrary strings. */
 406
 407 typedef struct string_item {
 408   struct string_item *next;
 409   uschar *text;
 410 } string_item;
 411
 412 /* Information about a soft delivery failure, for use when calculating
 413 retry information. It's separate from the address block, because there
 414 can be a chain of them for SMTP deliveries where multiple IP addresses
 415 can be tried. */
 416
 417 typedef struct retry_item {
 418   struct retry_item *next;        /* for chaining */
 419   uschar *key;                    /* string identifying host/address/message */
 420   int     basic_errno;            /* error code for this destination */
 421   int     more_errno;             /* additional error information */
 422   uschar *message;                /* local error message */
 423   int     flags;                  /* see below */
 424 } retry_item;
 425
 426 /* Retry data flags */
 427
 428 #define rf_delete   0x0001        /* retry info is to be deleted */
 429 #define rf_host     0x0002        /* retry info is for a remote host */
 430 #define rf_message  0x0004        /* retry info is for a host+message */
 431
 432 /* Information about a constructed message that is to be sent using the
 433 autoreply transport. This is pointed to from the address block. */
 434
 435 typedef struct reply_item {
 436   uschar *from;                   /* ) */
 437   uschar *reply_to;               /* ) */
 438   uschar *to;                     /* ) */
 439   uschar *cc;                     /* ) specific header fields */
 440   uschar *bcc;                    /* ) */
 441   uschar *subject;                /* ) */
 442   uschar *headers;                /* misc other headers, concatenated */
 443   uschar *text;                   /* text string body */
 444   uschar *file;                   /* file body */
 445   BOOL    file_expand;            /* expand the body */
 446   int     expand_forbid;          /* expansion lockout flags */
 447   uschar *logfile;                /* file to keep a log in */
 448   uschar *oncelog;                /* file to keep records in for once only */
 449   time_t  once_repeat;            /* time to repeat "once only" */
 450   BOOL    return_message;         /* send back the original message */
 451 } reply_item;
 452
 453
 454 /* The address_item structure contains many fields which are used at various
 455 times while delivering a message. Some are used only for remote deliveries;
 456 some only for local. A particular set of fields is copied whenever a child
 457 address is created. For convenience, we keep those fields in a separate
 458 sub-structure so they can be copied in one go. This also means I won't forget
 459 to edit the various copying places when new to-be-copied fields are added. */
 460
 461 typedef struct address_item_propagated {
 462   uschar *address_data;           /* arbitrary data to keep with the address */
 463   uschar *domain_data;            /* from "domains" lookup */
 464   uschar *localpart_data;         /* from "local_parts" lookup */
 465   uschar *errors_address;         /* where to send errors (NULL => sender) */
 466   header_line *extra_headers;     /* additional headers */
 467   uschar *remove_headers;         /* list of those to remove */
 468
 469   #ifdef EXPERIMENTAL_SRS
 470   uschar *srs_sender;             /* Change return path when delivering */
 471   #endif
 472   #ifdef SUPPORT_I18N
 473   BOOL    utf8_msg:1;             /* requires SMTPUTF8 processing */
 474   BOOL    utf8_downcvt:1;         /* mandatory downconvert on delivery */
 475   BOOL    utf8_downcvt_maybe:1;   /* optional downconvert on delivery */
 476   #endif
 477 } address_item_propagated;
 478
 479 /* Bits for the flags field below */
 480
 481 #define af_allow_file          0x00000001 /* allow file in generated address */
 482 #define af_allow_pipe          0x00000002 /* allow pipe in generated address */
 483 #define af_allow_reply         0x00000004 /* allow autoreply in generated address */
 484 #define af_dr_retry_exists     0x00000008 /* router retry record exists */
 485 #define af_expand_pipe         0x00000010 /* expand pipe arguments */
 486 #define af_file                0x00000020 /* file delivery; always with pfr */
 487 #define af_gid_set             0x00000040 /* gid field is set */
 488 #define af_home_expanded       0x00000080 /* home_dir is already expanded */
 489 #define af_ignore_error        0x00000100 /* ignore delivery error */
 490 #define af_initgroups          0x00000200 /* use initgroups() for local transporting */
 491 #define af_local_host_removed  0x00000400 /* local host was backup */
 492 #define af_lt_retry_exists     0x00000800 /* local transport retry exists */
 493 #define af_pfr                 0x00001000 /* pipe or file or reply delivery */
 494 #define af_retry_skipped       0x00002000 /* true if retry caused some skipping */
 495 #define af_retry_timedout      0x00004000 /* true if retry timed out */
 496 #define af_uid_set             0x00008000 /* uid field is set */
 497 #define af_hide_child          0x00010000 /* hide child in bounce/defer msgs */
 498 #define af_sverify_told        0x00020000 /* sender verify failure notified */
 499 #define af_verify_pmfail       0x00040000 /* verify failure was postmaster callout */
 500 #define af_verify_nsfail       0x00080000 /* verify failure was null sender callout */
 501 #define af_homonym             0x00100000 /* an ancestor has same address */
 502 #define af_verify_routed       0x00200000 /* for cached sender verify: routed OK */
 503 #define af_verify_callout      0x00400000 /* for cached sender verify: callout was specified */
 504 #define af_include_affixes     0x00800000 /* delivered with affixes in RCPT */
 505 #define af_cert_verified       0x01000000 /* delivered with verified TLS cert */
 506 #define af_pass_message        0x02000000 /* pass message in bounces */
 507 #define af_bad_reply           0x04000000 /* filter could not generate autoreply */
 508 #ifndef DISABLE_PRDR
 509 # define af_prdr_used          0x08000000 /* delivery used SMTP PRDR */
 510 #endif
 511 #define af_force_command       0x10000000 /* force_command in pipe transport */
 512 #ifdef EXPERIMENTAL_DANE
 513 # define af_dane_verified      0x20000000 /* TLS cert verify done with DANE */
 514 #endif
 515 #ifdef SUPPORT_I18N
 516 # define af_utf8_downcvt       0x40000000 /* downconvert was done for delivery */
 517 #endif
 518
 519 /* These flags must be propagated when a child is created */
 520
 521 #define af_propagate           (af_ignore_error)
 522
 523 /* The main address structure. Note that fields that are to be copied to
 524 generated addresses should be put in the address_item_propagated structure (see
 525 above) rather than directly into the address_item structure. */
 526
 527 typedef struct address_item {
 528   struct address_item *next;      /* for chaining addresses */
 529   struct address_item *parent;    /* parent address */
 530   struct address_item *first;     /* points to first after group delivery */
 531   struct address_item *dupof;     /* points to address this is a duplicate of */
 532
 533   router_instance *start_router;  /* generated address starts here */
 534   router_instance *router;        /* the router that routed */
 535   transport_instance *transport;  /* the transport to use */
 536
 537   host_item *host_list;           /* host data for the transport */
 538   host_item *host_used;           /* host that took delivery or failed hard */
 539   host_item *fallback_hosts;      /* to try if delivery defers */
 540
 541   reply_item *reply;              /* data for autoreply */
 542   retry_item *retries;            /* chain of retry information */
 543
 544   uschar *address;                /* address being delivered or routed */
 545   uschar *unique;                 /* used for disambiguating */
 546   uschar *cc_local_part;          /* caseful local part */
 547   uschar *lc_local_part;          /* lowercased local part */
 548   uschar *local_part;             /* points to cc or lc version */
 549   uschar *prefix;                 /* stripped prefix of local part */
 550   uschar *suffix;                 /* stripped suffix of local part */
 551   const uschar *domain;           /* working domain (lower cased) */
 552
 553   uschar *address_retry_key;      /* retry key including full address */
 554   uschar *domain_retry_key;       /* retry key for domain only */
 555
 556   uschar *current_dir;            /* current directory for transporting */
 557   uschar *home_dir;               /* home directory for transporting */
 558   uschar *message;                /* error message */
 559   uschar *user_message;           /* error message that can be sent over SMTP
 560                                      or quoted in bounce message */
 561   uschar *onetime_parent;         /* saved original parent for onetime */
 562   uschar **pipe_expandn;          /* numeric expansions for pipe from filter */
 563   uschar *return_filename;        /* name of return file */
 564   uschar *self_hostname;          /* after self=pass */
 565   uschar *shadow_message;         /* info about shadow transporting */
 566
 567 #ifdef SUPPORT_TLS
 568   uschar *cipher;                 /* Cipher used for transport */
 569   void   *ourcert;                /* Certificate offered to peer, binary */
 570   void   *peercert;               /* Certificate from peer, binary */
 571   uschar *peerdn;                 /* DN of server's certificate */
 572   int    ocsp;                    /* OCSP status of peer cert */
 573 #endif
 574
 575 #ifdef EXPERIMENTAL_DSN_INFO
 576   const uschar *smtp_greeting;    /* peer self-identification */
 577   const uschar *helo_response;    /* peer message */
 578 #endif
 579
 580   uschar *authenticator;          /* auth driver name used by transport */
 581   uschar *auth_id;                /* auth "login" name used by transport */
 582   uschar *auth_sndr;              /* AUTH arg to SMTP MAIL, used by transport */
 583
 584   uschar *dsn_orcpt;              /* DSN orcpt value */
 585   int     dsn_flags;              /* DSN flags */
 586   int     dsn_aware;              /* DSN aware flag */
 587
 588   uid_t   uid;                    /* uid for transporting */
 589   gid_t   gid;                    /* gid for transporting */
 590
 591   unsigned int flags;             /* a row of bits, defined above */
 592   unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
 593   unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
 594   int     mode;                   /* mode for local transporting to a file */
 595   int     more_errno;             /* additional error information */
 596                                   /* (may need to hold a timestamp) */
 597
 598   short int basic_errno;          /* status after failure */
 599   short int child_count;          /* number of child addresses */
 600   short int return_file;          /* fileno of return data file */
 601   short int special_action;       /* ( used when when deferred or failed */
 602                                   /* (  also  */
 603                                   /* ( contains = or - when successful SMTP delivered */
 604                                   /* (  also  */
 605                                   /* ( contains verify rc in sender verify cache */
 606   short int transport_return;     /* result of delivery attempt */
 607   address_item_propagated prop;   /* fields that are propagated to children */
 608 } address_item;
 609
 610 /* The table of header names consists of items of this type */
 611
 612 typedef struct {
 613   uschar *name;
 614   int     len;
 615   BOOL    allow_resent;
 616   int     htype;
 617 } header_name;
 618
 619 /* Chain of information about errors (e.g. bad addresses) */
 620
 621 typedef struct error_block {
 622   struct error_block *next;
 623   const uschar *text1;
 624   uschar *text2;
 625 } error_block;
 626
 627 /* Chain of file names when processing the queue */
 628
 629 typedef struct queue_filename {
 630   struct queue_filename *next;
 631   uschar dir_uschar;
 632   uschar text[1];
 633 } queue_filename;
 634
 635 /* Chain of items of retry information, read from the retry config. */
 636
 637 typedef struct retry_rule {
 638   struct retry_rule *next;
 639   int    rule;
 640   int    timeout;
 641   int    p1;
 642   int    p2;
 643 } retry_rule;
 644
 645 typedef struct retry_config {
 646   struct retry_config *next;
 647   uschar *pattern;
 648   int     basic_errno;
 649   int     more_errno;
 650   uschar *senders;
 651   retry_rule *rules;
 652 } retry_config;
 653
 654 /* Structure for each node in a tree, of which there are various kinds */
 655
 656 typedef struct tree_node {
 657   struct tree_node *left;         /* pointer to left child */
 658   struct tree_node *right;        /* pointer to right child */
 659   union
 660     {
 661     void  *ptr;                   /* pointer to data */
 662     int val;                      /* or integer data */
 663     } data;
 664   uschar  balance;                /* balancing factor */
 665   uschar  name[1];                /* node name - variable length */
 666 } tree_node;
 667
 668 /* Structure for holding time-limited data such as DNS returns.
 669 We use this rather than extending tree_node to avoid wasting
 670 space for most tree use (variables...) at the cost of complexity
 671 for the lookups cache */
 672
 673 typedef struct expiring_data {
 674   time_t expiry;                  /* if nonzero, data invalid after this time */
 675   void   *ptr;                    /* pointer to data */
 676 } expiring_data;
 677
 678 /* Structure for holding the handle and the cached last lookup for searches.
 679 This block is pointed to by the tree entry for the file. The file can get
 680 closed if too many are opened at once. There is a LRU chain for deciding which
 681 to close. */
 682
 683 typedef struct search_cache {
 684   void   *handle;                 /* lookup handle, or NULL if closed */
 685   int search_type;                /* search type */
 686   tree_node *up;                  /* LRU up pointer */
 687   tree_node *down;                /* LRU down pointer */
 688   tree_node *item_cache;          /* tree of cached results */
 689 } search_cache;
 690
 691 /* Structure for holding a partially decoded DNS record; the name has been
 692 uncompressed, but the data pointer is into the raw data. */
 693
 694 typedef struct {
 695   uschar  name[DNS_MAXNAME];      /* domain name */
 696   int     type;                   /* record type */
 697   unsigned short ttl;             /* time-to-live, seconds */
 698   int     size;                   /* size of data */
 699   uschar *data;                   /* pointer to data */
 700 } dns_record;
 701
 702 /* Structure for holding the result of a DNS query. */
 703
 704 typedef struct {
 705   int     answerlen;              /* length of the answer */
 706   uschar  answer[MAXPACKET];      /* the answer itself */
 707 } dns_answer;
 708
 709 /* Structure for holding the intermediate data while scanning a DNS answer
 710 block. */
 711
 712 typedef struct {
 713   int     rrcount;                /* count of RRs in the answer */
 714   uschar *aptr;                   /* pointer in the answer while scanning */
 715   dns_record srr;                 /* data from current record in scan */
 716 } dns_scan;
 717
 718 /* Structure for holding a chain of IP addresses that are extracted from
 719 an A, AAAA, or A6 record. For the first two, there is only ever one address,
 720 but the chaining feature of A6 allows for several addresses to be realized from
 721 a single initial A6 record. The structure defines the address field of length
 722 1. In use, a suitable sized block is obtained to hold the complete textual
 723 address. */
 724
 725 typedef struct dns_address {
 726   struct dns_address *next;
 727   uschar  address[1];
 728 } dns_address;
 729
 730 /* Structure used for holding intermediate data during MD5 computations. */
 731
 732 typedef struct md5 {
 733   unsigned int length;
 734   unsigned int abcd[4];
 735   }
 736 md5;
 737
 738 /* Structure used for holding intermediate data during SHA-1 computations. */
 739
 740 typedef struct sha1 {
 741   unsigned int H[5];
 742   unsigned int length;
 743   }
 744 sha1;
 745
 746 /* Structure used to hold incoming packets of SMTP responses for a specific
 747 socket. The packets which may contain multiple lines (and in some cases,
 748 multiple responses). */
 749
 750 typedef struct smtp_inblock {
 751   int     sock;                   /* the socket */
 752   int     buffersize;             /* the size of the buffer */
 753   uschar *ptr;                    /* current position in the buffer */
 754   uschar *ptrend;                 /* end of data in the buffer */
 755   uschar *buffer;                 /* the buffer itself */
 756 } smtp_inblock;
 757
 758 /* Structure used to hold buffered outgoing packets of SMTP commands for a
 759 specific socket. The packets which may contain multiple lines when pipelining
 760 is in use. */
 761
 762 typedef struct smtp_outblock {
 763   int     sock;                   /* the socket */
 764   int     cmd_count;              /* count of buffered commands */
 765   int     buffersize;             /* the size of the buffer */
 766   BOOL    authenticating;         /* TRUE when authenticating */
 767   uschar *ptr;                    /* current position in the buffer */
 768   uschar *buffer;                 /* the buffer itself */
 769 } smtp_outblock;
 770
 771 /* Structure to hold information about the source of redirection information */
 772
 773 typedef struct redirect_block {
 774   uschar *string;                 /* file name or string */
 775   uid_t  *owners;                 /* allowed file owners */
 776   gid_t  *owngroups;              /* allowed file groups */
 777   struct passwd *pw;              /* possible owner if not NULL */
 778   int     modemask;               /* forbidden bits */
 779   BOOL    isfile;                 /* TRUE if string is a file name */
 780   BOOL    check_owner;            /* TRUE, FALSE, or TRUE_UNSET */
 781   BOOL    check_group;            /* TRUE, FALSE, or TRUE_UNSET */
 782 } redirect_block;
 783
 784 /* Structure for passing arguments to check_host() */
 785
 786 typedef struct check_host_block {
 787   const uschar *host_name;
 788   const uschar *host_address;
 789   const uschar *host_ipv4;
 790   BOOL   negative;
 791 } check_host_block;
 792
 793 /* Structure for remembering lookup data when caching the result of
 794 a lookup in a named list. */
 795
 796 typedef struct namedlist_cacheblock {
 797   struct namedlist_cacheblock *next;
 798   uschar *key;
 799   uschar *data;
 800 } namedlist_cacheblock;
 801
 802 /* Structure for holding data for an entry in a named list */
 803
 804 typedef struct namedlist_block {
 805   const uschar *string;              /* the list string */
 806   namedlist_cacheblock *cache_data;  /* cached domain_data or localpart_data */
 807   int number;                        /* the number of the list for caching */
 808 } namedlist_block;
 809
 810 /* Structures for Access Control Lists */
 811
 812 typedef struct acl_condition_block {
 813   struct acl_condition_block *next;
 814   uschar *arg;
 815   int type;
 816   union {
 817     BOOL negated;
 818     uschar *varname;
 819   } u;
 820 } acl_condition_block;
 821
 822 typedef struct acl_block {
 823   struct acl_block *next;
 824   acl_condition_block *condition;
 825   int verb;
 826 } acl_block;
 827
 828 /* smtp transport calc outbound_ip */
 829 typedef BOOL (*oicf) (uschar *message_id, void *data);
 830
 831 /* DKIM information for transport */
 832 struct ob_dkim {
 833   uschar *dkim_domain;
 834   uschar *dkim_private_key;
 835   uschar *dkim_selector;
 836   uschar *dkim_canon;
 837   uschar *dkim_sign_headers;
 838   uschar *dkim_strict;
 839 } dkim;
 840
 841 /* End of structs.h */