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