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 bit tables for debugging and logging */
  36
  37 typedef struct bit_table {
  38   uschar *name;
  39   int bit;
  40 } bit_table;
  41
  42 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
  43
  44 typedef struct ugid_block {
  45   uid_t   uid;
  46   gid_t   gid;
  47   BOOL    uid_set;
  48   BOOL    gid_set;
  49   BOOL    initgroups;
  50 } ugid_block;
  51
  52 typedef enum {  CHUNKING_NOT_OFFERED = -1,
  53                 CHUNKING_OFFERED,
  54                 CHUNKING_ACTIVE,
  55                 CHUNKING_LAST} chunking_state_t;
  56
  57 /* Structure for holding information about a host for use mainly by routers,
  58 but also used when checking lists of hosts and when transporting. Looking up
  59 host addresses is done using this structure. */
  60
  61 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
  62
  63 typedef struct host_item {
  64   struct host_item *next;
  65   const uschar *name;             /* Host name */
  66   const uschar *address;          /* IP address in text form */
  67   int     port;                   /* port value in host order (if SRV lookup) */
  68   int     mx;                     /* MX value if found via MX records */
  69   int     sort_key;               /* MX*1000 plus random "fraction" */
  70   int     status;                 /* Usable, unusable, or unknown */
  71   int     why;                    /* Why host is unusable */
  72   int     last_try;               /* Time of last try if known */
  73   dnssec_status_t dnssec;
  74 } host_item;
  75
  76 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
  77 rewrite_headers field of a transport. */
  78
  79 typedef struct rewrite_rule {
  80   struct rewrite_rule *next;
  81   int     flags;
  82   uschar *key;
  83   uschar *replacement;
  84 } rewrite_rule;
  85
  86 /* This structure is used to pass back configuration data from the smtp
  87 transport to the outside world. It is used during callback processing. If ever
  88 another remote transport were implemented, it could use the same structure. */
  89
  90 typedef struct transport_feedback {
  91   uschar *interface;
  92   uschar *port;
  93   uschar *protocol;
  94   uschar *hosts;
  95   uschar *helo_data;
  96   BOOL   hosts_override;
  97   BOOL   hosts_randomize;
  98   BOOL   gethostbyname;
  99   BOOL   qualify_single;
 100   BOOL   search_parents;
 101 } transport_feedback;
 102
 103 /* Routers, transports, and authenticators have similar data blocks. Each
 104 driver that is compiled into the code is represented by a xxx_info block; the
 105 active drivers are represented by a chain of xxx_instance blocks. To make it
 106 possible to use the same code for reading the configuration files for all
 107 three, the layout of the start of the blocks is kept the same, and represented
 108 by the generic structures driver_info and driver_instance. */
 109
 110 typedef struct driver_instance {
 111   struct driver_instance *next;
 112   uschar *name;                   /* Instance name */
 113   struct driver_info *info;       /* Points to info for this driver */
 114   void   *options_block;          /* Pointer to private options */
 115   uschar *driver_name;            /* All start with this generic option */
 116 } driver_instance;
 117
 118 typedef struct driver_info {
 119   uschar *driver_name;            /* Name of driver */
 120   optionlist *options;            /* Table of private options names */
 121   int    *options_count;          /* -> Number of entries in table */
 122   void   *options_block;          /* Points to default private block */
 123   int     options_len;            /* Length of same in bytes */
 124   void  (*init)(                  /* Initialization entry point */
 125     struct driver_instance *);
 126 } driver_info;
 127
 128
 129 /* Structure for holding information about the configured transports. Some
 130 of the generally accessible options are set from the configuration file; others
 131 are set by transport initialization, since they can only be set for certain
 132 transports. They need to be generally accessible, however, as they are used by
 133 the main transport code. */
 134
 135 typedef struct transport_instance {
 136   struct transport_instance *next;
 137   uschar *name;                   /* Instance name */
 138   struct transport_info *info;    /* Info for this driver */
 139   void *options_block;            /* Pointer to private options */
 140   uschar *driver_name;            /* Must be first */
 141   int   (*setup)(                 /* Setup entry point */
 142     struct transport_instance *,
 143     struct address_item *,
 144     struct transport_feedback *,  /* For passing back config data */
 145     uid_t,                        /* The uid that will be used */
 146     gid_t,                        /* The gid that will be used */
 147     uschar **);                   /* For an error message */
 148                                   /**************************************/
 149   int     batch_max;              /* )                                  */
 150   uschar *batch_id;               /* )                                  */
 151   uschar *home_dir;               /* ) Used only for local transports   */
 152   uschar *current_dir;            /* )                                  */
 153                                   /**************************************/
 154   uschar *expand_multi_domain;    /* )                                  */
 155   BOOL    multi_domain;           /* )                                  */
 156   BOOL    overrides_hosts;        /* ) Used only for remote transports  */
 157   int     max_addresses;          /* )                                  */
 158   int     connection_max_messages;/* )                                  */
 159                                   /**************************************/
 160   BOOL    deliver_as_creator;     /* Used only by pipe at present */
 161   BOOL    disable_logging;        /* For very weird requirements */
 162   BOOL    initgroups;             /* Initialize groups when setting uid */
 163   BOOL    uid_set;                /* uid is set */
 164   BOOL    gid_set;                /* gid is set */
 165   uid_t   uid;
 166   gid_t   gid;
 167   uschar *expand_uid;             /* Variable uid */
 168   uschar *expand_gid;             /* Variable gid */
 169   uschar *warn_message;           /* Used only by appendfile at present */
 170   uschar *shadow;                 /* Name of shadow transport */
 171   uschar *shadow_condition;       /* Condition for running it */
 172   uschar *filter_command;         /* For on-the-fly-filtering */
 173   uschar *add_headers;            /* Add these headers */
 174   uschar *remove_headers;         /* Remove these headers */
 175   uschar *return_path;            /* Overriding (rewriting) return path */
 176   uschar *debug_string;           /* Debugging output */
 177   uschar *max_parallel;           /* Number of concurrent instances */
 178   uschar *message_size_limit;     /* Biggest message this transport handles */
 179   uschar *headers_rewrite;        /* Rules for rewriting headers */
 180   rewrite_rule *rewrite_rules;    /* Parsed rewriting rules */
 181   int     rewrite_existflags;     /* Bits showing which headers are rewritten */
 182   int     filter_timeout;         /* For transport filter timing */
 183   BOOL    body_only;              /* Deliver only the body */
 184   BOOL    delivery_date_add;      /* Add Delivery-Date header */
 185   BOOL    envelope_to_add;        /* Add Envelope-To header */
 186   BOOL    headers_only;           /* Deliver only the headers */
 187   BOOL    rcpt_include_affixes;   /* TRUE to retain affixes in RCPT commands */
 188   BOOL    return_path_add;        /* Add Return-Path header */
 189   BOOL    return_output;          /* TRUE if output should always be returned */
 190   BOOL    return_fail_output;     /* ditto, but only on failure */
 191   BOOL    log_output;             /* Similarly for logging */
 192   BOOL    log_fail_output;
 193   BOOL    log_defer_output;
 194   BOOL    retry_use_local_part;   /* Defaults true for local, false for remote */
 195 #ifndef DISABLE_EVENT
 196   uschar  *event_action;          /* String to expand on notable events */
 197 #endif
 198 } transport_instance;
 199
 200
 201 /* Structure for holding information about a type of transport. The first six
 202 fields must match driver_info above. */
 203
 204 typedef struct transport_info {
 205   uschar *driver_name;            /* Driver name */
 206   optionlist *options;            /* Table of private options names */
 207   int    *options_count;          /* -> Number of entries in table */
 208   void   *options_block;          /* Points to default private block */
 209   int     options_len;            /* Length of same in bytes */
 210   void (*init)(                   /* Initialization function */
 211     struct transport_instance *);
 212 /****/
 213   BOOL (*code)(                   /* Main entry point */
 214     transport_instance *,
 215     struct address_item *);
 216   void (*tidyup)(                 /* Tidyup function */
 217     struct transport_instance *);
 218   void  (*closedown)(             /* For closing down a passed channel */
 219     struct transport_instance *);
 220   BOOL    local;                  /* TRUE for local transports */
 221 } transport_info;
 222
 223
 224 /* smtp transport datachunk callback */
 225
 226 #define tc_reap_prev    BIT(0)  /* Flags: reap previous SMTP cmd responses */
 227 #define tc_chunk_last   BIT(1)  /* annotate chunk SMTP cmd as LAST */
 228
 229 struct transport_context;
 230 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
 231
 232 /* Structure for information about a delivery-in-progress */
 233
 234 typedef struct transport_context {
 235   union {                       /* discriminated by option topt_output_string */
 236     int                   fd;   /* file descriptor to write message to */
 237     gstring *             msg;  /* allocated string with written message */
 238   } u;
 239   transport_instance    * tblock;               /* transport */
 240   struct address_item   * addr;
 241   uschar                * check_string;         /* string replacement */
 242   uschar                * escape_string;
 243   int                     options;              /* output processing topt_* */
 244
 245   /* items below only used with option topt_use_bdat */
 246   tpt_chunk_cmd_cb        chunk_cb;             /* per-datachunk callback */
 247   void                  * smtp_context;
 248 } transport_ctx;
 249
 250
 251
 252 typedef struct {
 253   uschar *request;
 254   uschar *require;
 255 } dnssec_domains;
 256
 257 /* Structure for holding information about the configured routers. */
 258
 259 typedef struct router_instance {
 260   struct router_instance *next;
 261   uschar *name;
 262   struct router_info *info;
 263   void   *options_block;          /* Pointer to private options */
 264   uschar *driver_name;            /* Must be first */
 265
 266   uschar *address_data;           /* Arbitrary data */
 267 #ifdef EXPERIMENTAL_BRIGHTMAIL
 268   uschar *bmi_rule;               /* Brightmail AntiSpam rule checking */
 269 #endif
 270   uschar *cannot_route_message;   /* Used when routing fails */
 271   uschar *condition;              /* General condition */
 272   uschar *current_directory;      /* For use during delivery */
 273   uschar *debug_string;           /* Debugging output */
 274   uschar *domains;                /* Specific domains */
 275   uschar *errors_to;              /* Errors address */
 276   uschar *expand_gid;             /* Expanded gid string */
 277   uschar *expand_uid;             /* Expanded uid string */
 278   uschar *expand_more;            /* Expanded more string */
 279   uschar *expand_unseen;          /* Expanded unseen string */
 280   uschar *extra_headers;          /* Additional headers */
 281   uschar *fallback_hosts;         /* For remote transports (text list) */
 282   uschar *home_directory;         /* For use during delivery */
 283   uschar *ignore_target_hosts;    /* Target hosts to ignore */
 284   uschar *local_parts;            /* Specific local parts */
 285   uschar *pass_router_name;       /* Router for passed address */
 286   uschar *prefix;                 /* Address prefix */
 287   uschar *redirect_router_name;   /* Router for generated address */
 288   uschar *remove_headers;         /* Removed headers */
 289   uschar *require_files;          /* File checks before router is run */
 290   uschar *router_home_directory;  /* For use while routing */
 291   uschar *self;                   /* Text option for handling self reference */
 292   uschar *senders;                /* Specific senders */
 293   uschar *suffix;                 /* Address suffix */
 294   uschar *translate_ip_address;   /* IP address translation fudgery */
 295   uschar *transport_name;         /* Transport name */
 296
 297   BOOL    address_test;           /* Use this router when testing addresses */
 298 #ifdef EXPERIMENTAL_BRIGHTMAIL
 299   BOOL    bmi_deliver_alternate;  /* TRUE => BMI said that message should be delivered to alternate location */
 300   BOOL    bmi_deliver_default;    /* TRUE => BMI said that message should be delivered to default location */
 301   BOOL    bmi_dont_deliver;       /* TRUE => BMI said that message should not be delivered at all */
 302 #endif
 303   BOOL    expn;                   /* Use this router when processing EXPN */
 304   BOOL    caseful_local_part;     /* TRUE => don't lowercase */
 305   BOOL    check_local_user;       /* TRUE => check local user */
 306   BOOL    disable_logging;        /* For very weird requirements */
 307   BOOL    fail_verify_recipient;  /* Fail verify if recipient match this router */
 308   BOOL    fail_verify_sender;     /* Fail verify if sender match this router */
 309   BOOL    gid_set;                /* Flag to indicate gid is set */
 310   BOOL    initgroups;             /* TRUE if initgroups is required */
 311   BOOL    log_as_local;           /* TRUE logs as a local delivery */
 312   BOOL    more;                   /* If FALSE, do no more if this one fails */
 313   BOOL    pass_on_timeout;        /* Treat timeout DEFERs as fails */
 314   BOOL    prefix_optional;        /* Just what it says */
 315   BOOL    repeat_use;             /* If FALSE, skip if ancestor used it */
 316   BOOL    retry_use_local_part;   /* Just what it says */
 317   BOOL    same_domain_copy_routing; /* TRUE => copy routing for same domain */
 318   BOOL    self_rewrite;           /* TRUE to rewrite headers if making local */
 319   BOOL    suffix_optional;        /* As it says */
 320   BOOL    verify_only;            /* Skip this router if not verifying */
 321   BOOL    verify_recipient;       /* Use this router when verifying a recipient*/
 322   BOOL    verify_sender;          /* Use this router when verifying a sender */
 323   BOOL    uid_set;                /* Flag to indicate uid is set */
 324   BOOL    unseen;                 /* If TRUE carry on, even after success */
 325   BOOL    dsn_lasthop;            /* If TRUE, this router is a DSN endpoint */
 326
 327   int     self_code;              /* Encoded version of "self" */
 328   uid_t   uid;                    /* Fixed uid value */
 329   gid_t   gid;                    /* Fixed gid value */
 330
 331   host_item *fallback_hostlist;   /* For remote transport (block chain) */
 332   transport_instance *transport;  /* Transport block (when found) */
 333   struct router_instance *pass_router; /* Actual router for passed address */
 334   struct router_instance *redirect_router; /* Actual router for generated address */
 335
 336   dnssec_domains dnssec;
 337 } router_instance;
 338
 339
 340 /* Structure for holding information about a type of router. The first six
 341 fields must match driver_info above. */
 342
 343 typedef struct router_info {
 344   uschar *driver_name;
 345   optionlist *options;            /* Table of private options names */
 346   int    *options_count;          /* -> Number of entries in table */
 347   void   *options_block;          /* Points to default private block */
 348   int     options_len;            /* Length of same in bytes */
 349   void (*init)(                   /* Initialization function */
 350     struct router_instance *);
 351 /****/
 352   int (*code)(                    /* Main entry point */
 353     router_instance *,
 354     struct address_item *,
 355     struct passwd *,
 356     int,
 357     struct address_item **,
 358     struct address_item **,
 359     struct address_item **,
 360     struct address_item **);
 361   void (*tidyup)(                 /* Tidyup function */
 362     struct router_instance *);
 363   int     ri_flags;               /* Descriptive flags */
 364 } router_info;
 365
 366
 367 /* Structure for holding information about a lookup type. */
 368
 369 #include "lookupapi.h"
 370
 371
 372 /* Structure for holding information about the configured authentication
 373 mechanisms */
 374
 375 typedef struct auth_instance {
 376   struct auth_instance *next;
 377   uschar *name;                   /* Exim instance name */
 378   struct auth_info *info;         /* Pointer to driver info block */
 379   void   *options_block;          /* Pointer to private options */
 380   uschar *driver_name;            /* Must be first */
 381   uschar *advertise_condition;    /* Are we going to advertise this?*/
 382   uschar *client_condition;       /* Should the client try this? */
 383   uschar *public_name;            /* Advertised name */
 384   uschar *set_id;                 /* String to set when server as authenticated id */
 385   uschar *set_client_id;          /* String to set when client as client_authenticated id */
 386   uschar *mail_auth_condition;    /* Condition for AUTH on MAIL command */
 387   uschar *server_debug_string;    /* Debugging output */
 388   uschar *server_condition;       /* Authorization condition */
 389   BOOL    client;                 /* TRUE if client option(s) set */
 390   BOOL    server;                 /* TRUE if server options(s) set */
 391   BOOL    advertised;             /* Set TRUE when advertised */
 392 } auth_instance;
 393
 394
 395 /* Structure for holding information about an authentication mechanism. The
 396 first six fields must match driver_info above. */
 397
 398 typedef struct auth_info {
 399   uschar *driver_name;            /* e.g. "condition" */
 400   optionlist *options;            /* Table of private options names */
 401   int    *options_count;          /* -> Number of entries in table */
 402   void   *options_block;          /* Points to default private block */
 403   int     options_len;            /* Length of same in bytes */
 404   void (*init)(                   /* initialization function */
 405     struct auth_instance *);
 406 /****/
 407   int (*servercode)(              /* server function */
 408     auth_instance *,              /* the instance data */
 409     uschar *);                    /* rest of AUTH command */
 410   int (*clientcode)(              /* client function */
 411     struct auth_instance *,
 412     struct smtp_inblock *,        /* socket and input buffer */
 413     struct smtp_outblock *,       /* socket and output buffer */
 414     int,                          /* command timeout */
 415     uschar *,                     /* buffer for reading response */
 416     int);                         /* sizeof buffer */
 417   void (*version_report)(         /* diagnostic version reporting */
 418     FILE *);                      /* I/O stream to print to */
 419 } auth_info;
 420
 421
 422 /* Structure for holding a single IP address and port; used for the chain of
 423 addresses and ports for the local host. Make the char string large enough to
 424 hold an IPv6 address. */
 425
 426 typedef struct ip_address_item {
 427   struct ip_address_item *next;
 428   int    port;
 429   BOOL   v6_include_v4;            /* Used in the daemon */
 430   uschar address[46];
 431 } ip_address_item;
 432
 433 /* Structure for chaining together arbitrary strings. */
 434
 435 typedef struct string_item {
 436   struct string_item *next;
 437   uschar *text;
 438 } string_item;
 439
 440 /* Information about a soft delivery failure, for use when calculating
 441 retry information. It's separate from the address block, because there
 442 can be a chain of them for SMTP deliveries where multiple IP addresses
 443 can be tried. */
 444
 445 typedef struct retry_item {
 446   struct retry_item *next;        /* for chaining */
 447   uschar *key;                    /* string identifying host/address/message */
 448   int     basic_errno;            /* error code for this destination */
 449   int     more_errno;             /* additional error information */
 450   uschar *message;                /* local error message */
 451   int     flags;                  /* see below */
 452 } retry_item;
 453
 454 /* Retry data flags */
 455
 456 #define rf_delete   0x0001        /* retry info is to be deleted */
 457 #define rf_host     0x0002        /* retry info is for a remote host */
 458 #define rf_message  0x0004        /* retry info is for a host+message */
 459
 460 /* Information about a constructed message that is to be sent using the
 461 autoreply transport. This is pointed to from the address block. */
 462
 463 typedef struct reply_item {
 464   uschar *from;                   /* ) */
 465   uschar *reply_to;               /* ) */
 466   uschar *to;                     /* ) */
 467   uschar *cc;                     /* ) specific header fields */
 468   uschar *bcc;                    /* ) */
 469   uschar *subject;                /* ) */
 470   uschar *headers;                /* misc other headers, concatenated */
 471   uschar *text;                   /* text string body */
 472   uschar *file;                   /* file body */
 473   BOOL    file_expand;            /* expand the body */
 474   int     expand_forbid;          /* expansion lockout flags */
 475   uschar *logfile;                /* file to keep a log in */
 476   uschar *oncelog;                /* file to keep records in for once only */
 477   time_t  once_repeat;            /* time to repeat "once only" */
 478   BOOL    return_message;         /* send back the original message */
 479 } reply_item;
 480
 481
 482 /* The address_item structure contains many fields which are used at various
 483 times while delivering a message. Some are used only for remote deliveries;
 484 some only for local. A particular set of fields is copied whenever a child
 485 address is created. For convenience, we keep those fields in a separate
 486 sub-structure so they can be copied in one go. This also means I won't forget
 487 to edit the various copying places when new to-be-copied fields are added. */
 488
 489 typedef struct address_item_propagated {
 490   uschar *address_data;           /* arbitrary data to keep with the address */
 491   uschar *domain_data;            /* from "domains" lookup */
 492   uschar *localpart_data;         /* from "local_parts" lookup */
 493   uschar *errors_address;         /* where to send errors (NULL => sender) */
 494   header_line *extra_headers;     /* additional headers */
 495   uschar *remove_headers;         /* list of those to remove */
 496
 497   #ifdef EXPERIMENTAL_SRS
 498   uschar *srs_sender;             /* Change return path when delivering */
 499   #endif
 500   BOOL    ignore_error:1;         /* ignore delivery error */
 501   #ifdef SUPPORT_I18N
 502   BOOL    utf8_msg:1;             /* requires SMTPUTF8 processing */
 503   BOOL    utf8_downcvt:1;         /* mandatory downconvert on delivery */
 504   BOOL    utf8_downcvt_maybe:1;   /* optional downconvert on delivery */
 505   #endif
 506 } address_item_propagated;
 507
 508
 509 /* The main address structure. Note that fields that are to be copied to
 510 generated addresses should be put in the address_item_propagated structure (see
 511 above) rather than directly into the address_item structure. */
 512
 513 typedef struct address_item {
 514   struct address_item *next;      /* for chaining addresses */
 515   struct address_item *parent;    /* parent address */
 516   struct address_item *first;     /* points to first after group delivery */
 517   struct address_item *dupof;     /* points to address this is a duplicate of */
 518
 519   router_instance *start_router;  /* generated address starts here */
 520   router_instance *router;        /* the router that routed */
 521   transport_instance *transport;  /* the transport to use */
 522
 523   host_item *host_list;           /* host data for the transport */
 524   host_item *host_used;           /* host that took delivery or failed hard */
 525   host_item *fallback_hosts;      /* to try if delivery defers */
 526
 527   reply_item *reply;              /* data for autoreply */
 528   retry_item *retries;            /* chain of retry information */
 529
 530   uschar *address;                /* address being delivered or routed */
 531   uschar *unique;                 /* used for disambiguating */
 532   uschar *cc_local_part;          /* caseful local part */
 533   uschar *lc_local_part;          /* lowercased local part */
 534   uschar *local_part;             /* points to cc or lc version */
 535   uschar *prefix;                 /* stripped prefix of local part */
 536   uschar *suffix;                 /* stripped suffix of local part */
 537   const uschar *domain;           /* working domain (lower cased) */
 538
 539   uschar *address_retry_key;      /* retry key including full address */
 540   uschar *domain_retry_key;       /* retry key for domain only */
 541
 542   uschar *current_dir;            /* current directory for transporting */
 543   uschar *home_dir;               /* home directory for transporting */
 544   uschar *message;                /* error message */
 545   uschar *user_message;           /* error message that can be sent over SMTP
 546                                      or quoted in bounce message */
 547   uschar *onetime_parent;         /* saved original parent for onetime */
 548   uschar **pipe_expandn;          /* numeric expansions for pipe from filter */
 549   uschar *return_filename;        /* name of return file */
 550   uschar *self_hostname;          /* after self=pass */
 551   uschar *shadow_message;         /* info about shadow transporting */
 552
 553 #ifdef SUPPORT_TLS
 554   uschar *cipher;                 /* Cipher used for transport */
 555   void   *ourcert;                /* Certificate offered to peer, binary */
 556   void   *peercert;               /* Certificate from peer, binary */
 557   uschar *peerdn;                 /* DN of server's certificate */
 558   int    ocsp;                    /* OCSP status of peer cert */
 559 #endif
 560
 561 #ifdef EXPERIMENTAL_DSN_INFO
 562   const uschar *smtp_greeting;    /* peer self-identification */
 563   const uschar *helo_response;    /* peer message */
 564 #endif
 565
 566   uschar *authenticator;          /* auth driver name used by transport */
 567   uschar *auth_id;                /* auth "login" name used by transport */
 568   uschar *auth_sndr;              /* AUTH arg to SMTP MAIL, used by transport */
 569
 570   uschar *dsn_orcpt;              /* DSN orcpt value */
 571   int     dsn_flags;              /* DSN flags */
 572   int     dsn_aware;              /* DSN aware flag */
 573
 574   uid_t   uid;                    /* uid for transporting */
 575   gid_t   gid;                    /* gid for transporting */
 576
 577                                   /* flags */
 578   struct {
 579     BOOL af_allow_file:1;               /* allow file in generated address */
 580     BOOL af_allow_pipe:1;               /* allow pipe in generated address */
 581     BOOL af_allow_reply:1;              /* allow autoreply in generated address */
 582     BOOL af_dr_retry_exists:1;          /* router retry record exists */
 583     BOOL af_expand_pipe:1;              /* expand pipe arguments */
 584     BOOL af_file:1;                     /* file delivery; always with pfr */
 585     BOOL af_gid_set:1;                  /* gid field is set */
 586     BOOL af_home_expanded:1;            /* home_dir is already expanded */
 587     BOOL af_initgroups:1;               /* use initgroups() for local transporting */
 588     BOOL af_local_host_removed:1;       /* local host was backup */
 589     BOOL af_lt_retry_exists:1;          /* local transport retry exists */
 590     BOOL af_pfr:1;                      /* pipe or file or reply delivery */
 591     BOOL af_retry_skipped:1;            /* true if retry caused some skipping */
 592     BOOL af_retry_timedout:1;           /* true if retry timed out */
 593     BOOL af_uid_set:1;                  /* uid field is set */
 594     BOOL af_hide_child:1;               /* hide child in bounce/defer msgs */
 595     BOOL af_sverify_told:1;             /* sender verify failure notified */
 596     BOOL af_verify_pmfail:1;            /* verify failure was postmaster callout */
 597     BOOL af_verify_nsfail:1;            /* verify failure was null sender callout */
 598     BOOL af_homonym:1;                  /* an ancestor has same address */
 599     BOOL af_verify_routed:1;            /* for cached sender verify: routed OK */
 600     BOOL af_verify_callout:1;           /* for cached sender verify: callout was specified */
 601     BOOL af_include_affixes:1;          /* delivered with affixes in RCPT */
 602     BOOL af_cert_verified:1;            /* delivered with verified TLS cert */
 603     BOOL af_pass_message:1;             /* pass message in bounces */
 604     BOOL af_bad_reply:1;                /* filter could not generate autoreply */
 605     BOOL af_tcp_fastopen_conn:1;        /* delivery connection used TCP Fast Open */
 606     BOOL af_tcp_fastopen:1;             /* delivery usefuly used TCP Fast Open */
 607 #ifndef DISABLE_PRDR
 608     BOOL af_prdr_used:1;                /* delivery used SMTP PRDR */
 609 #endif
 610     BOOL af_chunking_used:1;            /* delivery used SMTP CHUNKING */
 611     BOOL af_force_command:1;            /* force_command in pipe transport */
 612 #ifdef EXPERIMENTAL_DANE
 613     BOOL af_dane_verified:1;            /* TLS cert verify done with DANE */
 614 #endif
 615 #ifdef SUPPORT_I18N
 616     BOOL af_utf8_downcvt:1;             /* downconvert was done for delivery */
 617 #endif
 618   } flags;
 619
 620   unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
 621   unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
 622   int     mode;                   /* mode for local transporting to a file */
 623   int     more_errno;             /* additional error information */
 624                                   /* (may need to hold a timestamp) */
 625   unsigned int delivery_usec;     /* subsecond part of delivery time */
 626
 627   short int basic_errno;          /* status after failure */
 628   unsigned short child_count;     /* number of child addresses */
 629   short int return_file;          /* fileno of return data file */
 630   short int special_action;       /* ( used when when deferred or failed */
 631                                   /* (  also  */
 632                                   /* ( contains = or - when successful SMTP delivered */
 633                                   /* (  also  */
 634                                   /* ( contains verify rc in sender verify cache */
 635   short int transport_return;     /* result of delivery attempt */
 636   address_item_propagated prop;   /* fields that are propagated to children */
 637 } address_item;
 638
 639 /* The table of header names consists of items of this type */
 640
 641 typedef struct {
 642   uschar *name;
 643   int     len;
 644   BOOL    allow_resent;
 645   int     htype;
 646 } header_name;
 647
 648 /* Chain of information about errors (e.g. bad addresses) */
 649
 650 typedef struct error_block {
 651   struct error_block *next;
 652   const uschar *text1;
 653   uschar *text2;
 654 } error_block;
 655
 656 /* Chain of file names when processing the queue */
 657
 658 typedef struct queue_filename {
 659   struct queue_filename *next;
 660   uschar dir_uschar;
 661   uschar text[1];
 662 } queue_filename;
 663
 664 /* Chain of items of retry information, read from the retry config. */
 665
 666 typedef struct retry_rule {
 667   struct retry_rule *next;
 668   int    rule;
 669   int    timeout;
 670   int    p1;
 671   int    p2;
 672 } retry_rule;
 673
 674 typedef struct retry_config {
 675   struct retry_config *next;
 676   uschar *pattern;
 677   int     basic_errno;
 678   int     more_errno;
 679   uschar *senders;
 680   retry_rule *rules;
 681 } retry_config;
 682
 683 /* Structure for each node in a tree, of which there are various kinds */
 684
 685 typedef struct tree_node {
 686   struct tree_node *left;         /* pointer to left child */
 687   struct tree_node *right;        /* pointer to right child */
 688   union
 689     {
 690     void  *ptr;                   /* pointer to data */
 691     int val;                      /* or integer data */
 692     } data;
 693   uschar  balance;                /* balancing factor */
 694   uschar  name[1];                /* node name - variable length */
 695 } tree_node;
 696
 697 typedef struct tree_node_64 {
 698   struct tree_node_64 *left;      /* pointer to left child */
 699   struct tree_node_64 *right;     /* pointer to right child */
 700   union
 701     {
 702     void  *ptr;                   /* pointer to data */
 703     int val;                      /* or integer data */
 704     } data;
 705   uschar  balance;                /* balancing factor */
 706   uschar  name[64];               /* node name - bounded length */
 707 } tree_node_64;
 708
 709 /* Structure for remembering macros for the configuration file */
 710
 711 typedef struct macro_item {
 712   BOOL          command_line;
 713   unsigned      namelen;
 714   unsigned      replen;
 715   unsigned      m_number;
 716   tree_node     tnode;          /* contains name; ptr indicates val */
 717 } macro_item;
 718
 719 typedef struct macro_item_64 {
 720   BOOL          command_line;
 721   unsigned      namelen;
 722   unsigned      replen;
 723   unsigned      m_number;
 724   tree_node_64  tnode;          /* contains name; ptr indicates val */
 725 } macro_item_64;
 726
 727 #define tnode_to_mitem(tp) (tp ? (macro_item *) (CS(tp) - offsetof(macro_item, tnode)) : NULL)
 728
 729 /* Structure for holding time-limited data such as DNS returns.
 730 We use this rather than extending tree_node to avoid wasting
 731 space for most tree use (variables...) at the cost of complexity
 732 for the lookups cache */
 733
 734 typedef struct expiring_data {
 735   time_t expiry;                  /* if nonzero, data invalid after this time */
 736   void   *ptr;                    /* pointer to data */
 737 } expiring_data;
 738
 739 /* Structure for holding the handle and the cached last lookup for searches.
 740 This block is pointed to by the tree entry for the file. The file can get
 741 closed if too many are opened at once. There is a LRU chain for deciding which
 742 to close. */
 743
 744 typedef struct search_cache {
 745   void   *handle;                 /* lookup handle, or NULL if closed */
 746   int search_type;                /* search type */
 747   tree_node *up;                  /* LRU up pointer */
 748   tree_node *down;                /* LRU down pointer */
 749   tree_node *item_cache;          /* tree of cached results */
 750 } search_cache;
 751
 752 /* Structure for holding a partially decoded DNS record; the name has been
 753 uncompressed, but the data pointer is into the raw data. */
 754
 755 typedef struct {
 756   uschar        name[DNS_MAXNAME];      /* domain name */
 757   int           type;                   /* record type */
 758   unsigned short ttl;                   /* time-to-live, seconds */
 759   int           size;                   /* size of data */
 760   const uschar *data;                   /* pointer to data */
 761 } dns_record;
 762
 763 /* Structure for holding the result of a DNS query. */
 764
 765 typedef struct {
 766   int     answerlen;              /* length of the answer */
 767   uschar  answer[MAXPACKET];      /* the answer itself */
 768 } dns_answer;
 769
 770 /* Structure for holding the intermediate data while scanning a DNS answer
 771 block. */
 772
 773 typedef struct {
 774   int            rrcount;         /* count of RRs in the answer */
 775   const uschar *aptr;             /* pointer in the answer while scanning */
 776   dns_record     srr;             /* data from current record in scan */
 777 } dns_scan;
 778
 779 /* Structure for holding a chain of IP addresses that are extracted from
 780 an A, AAAA, or A6 record. For the first two, there is only ever one address,
 781 but the chaining feature of A6 allows for several addresses to be realized from
 782 a single initial A6 record. The structure defines the address field of length
 783 1. In use, a suitable sized block is obtained to hold the complete textual
 784 address. */
 785
 786 typedef struct dns_address {
 787   struct dns_address *next;
 788   uschar  address[1];
 789 } dns_address;
 790
 791 /* Structure used for holding intermediate data during MD5 computations. */
 792
 793 typedef struct md5 {
 794   unsigned int length;
 795   unsigned int abcd[4];
 796   }
 797 md5;
 798
 799 /* Structure used for holding intermediate data during SHA-1 computations. */
 800
 801 typedef struct sha1 {
 802   unsigned int H[5];
 803   unsigned int length;
 804   }
 805 sha1;
 806
 807 /* Structure used to hold incoming packets of SMTP responses for a specific
 808 socket. The packets which may contain multiple lines (and in some cases,
 809 multiple responses). */
 810
 811 typedef struct smtp_inblock {
 812   int     sock;                   /* the socket */
 813   int     buffersize;             /* the size of the buffer */
 814   uschar *ptr;                    /* current position in the buffer */
 815   uschar *ptrend;                 /* end of data in the buffer */
 816   uschar *buffer;                 /* the buffer itself */
 817 } smtp_inblock;
 818
 819 /* Structure used to hold buffered outgoing packets of SMTP commands for a
 820 specific socket. The packets which may contain multiple lines when pipelining
 821 is in use. */
 822
 823 typedef struct smtp_outblock {
 824   int     sock;                   /* the socket */
 825   int     cmd_count;              /* count of buffered commands */
 826   int     buffersize;             /* the size of the buffer */
 827   BOOL    authenticating;         /* TRUE when authenticating */
 828   uschar *ptr;                    /* current position in the buffer */
 829   uschar *buffer;                 /* the buffer itself */
 830 } smtp_outblock;
 831
 832 /* Structure to hold information about the source of redirection information */
 833
 834 typedef struct redirect_block {
 835   uschar *string;                 /* file name or string */
 836   uid_t  *owners;                 /* allowed file owners */
 837   gid_t  *owngroups;              /* allowed file groups */
 838   struct passwd *pw;              /* possible owner if not NULL */
 839   int     modemask;               /* forbidden bits */
 840   BOOL    isfile;                 /* TRUE if string is a file name */
 841   BOOL    check_owner;            /* TRUE, FALSE, or TRUE_UNSET */
 842   BOOL    check_group;            /* TRUE, FALSE, or TRUE_UNSET */
 843 } redirect_block;
 844
 845 /* Structure for passing arguments to check_host() */
 846
 847 typedef struct check_host_block {
 848   const uschar *host_name;
 849   const uschar *host_address;
 850   const uschar *host_ipv4;
 851   BOOL   negative;
 852 } check_host_block;
 853
 854 /* Structure for remembering lookup data when caching the result of
 855 a lookup in a named list. */
 856
 857 typedef struct namedlist_cacheblock {
 858   struct namedlist_cacheblock *next;
 859   uschar *key;
 860   uschar *data;
 861 } namedlist_cacheblock;
 862
 863 /* Structure for holding data for an entry in a named list */
 864
 865 typedef struct namedlist_block {
 866   const uschar *string;              /* the list string */
 867   namedlist_cacheblock *cache_data;  /* cached domain_data or localpart_data */
 868   int number;                        /* the number of the list for caching */
 869 } namedlist_block;
 870
 871 /* Structures for Access Control Lists */
 872
 873 typedef struct acl_condition_block {
 874   struct acl_condition_block *next;
 875   uschar *arg;
 876   int type;
 877   union {
 878     BOOL negated;
 879     uschar *varname;
 880   } u;
 881 } acl_condition_block;
 882
 883 typedef struct acl_block {
 884   struct acl_block *next;
 885   acl_condition_block *condition;
 886   int verb;
 887 } acl_block;
 888
 889 /* smtp transport calc outbound_ip */
 890 typedef BOOL (*oicf) (uschar *message_id, void *data);
 891
 892 /* DKIM information for transport */
 893 struct ob_dkim {
 894   uschar *dkim_domain;
 895   uschar *dkim_identity;
 896   uschar *dkim_private_key;
 897   uschar *dkim_selector;
 898   uschar *dkim_canon;
 899   uschar *dkim_sign_headers;
 900   uschar *dkim_strict;
 901   uschar *dkim_hash;
 902   BOOL    dot_stuffed;
 903 };
 904
 905 /* End of structs.h */