src/src/structs.h

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2017 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8
   9 /* Definitions of various structures. In addition, those that are visible for
  10 the compilation of local_scan() are defined in local_scan.h. These are
  11
  12   header_line
  13   optionlist
  14   recipient_item
  15
  16 For those declared here, we have to pre-declare some because of mutually
  17 recursive definitions in the auths, routers, and transports blocks. */
  18
  19 struct address_item;
  20 struct auth_info;
  21 struct driver_info;
  22 struct director_info;
  23 struct smtp_inblock;
  24 struct smtp_outblock;
  25 struct transport_info;
  26 struct router_info;
  27
  28 /* Growable-string */
  29 typedef struct gstring {
  30   int   size;           /* Current capacity of string memory */
  31   int   ptr;            /* Offset at which to append further chars */
  32   uschar * s;           /* The string memory */
  33 } gstring;
  34
  35 /* Structure for remembering macros for the configuration file */
  36
  37 typedef struct macro_item {
  38   struct  macro_item * next;
  39   BOOL          command_line;
  40   unsigned      namelen;
  41   unsigned      replen;
  42   const uschar * name;
  43   const uschar * replacement;
  44 } macro_item;
  45
  46 /* Structure for bit tables for debugging and logging */
  47
  48 typedef struct bit_table {
  49   uschar *name;
  50   int bit;
  51 } bit_table;
  52
  53 /* Block for holding a uid and gid, possibly unset, and an initgroups flag. */
  54
  55 typedef struct ugid_block {
  56   uid_t   uid;
  57   gid_t   gid;
  58   BOOL    uid_set;
  59   BOOL    gid_set;
  60   BOOL    initgroups;
  61 } ugid_block;
  62
  63 typedef enum {  CHUNKING_NOT_OFFERED = -1,
  64                 CHUNKING_OFFERED,
  65                 CHUNKING_ACTIVE,
  66                 CHUNKING_LAST} chunking_state_t;
  67
  68 /* Structure for holding information about a host for use mainly by routers,
  69 but also used when checking lists of hosts and when transporting. Looking up
  70 host addresses is done using this structure. */
  71
  72 typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
  73
  74 typedef struct host_item {
  75   struct host_item *next;
  76   const uschar *name;             /* Host name */
  77   const uschar *address;          /* IP address in text form */
  78   int     port;                   /* port value in host order (if SRV lookup) */
  79   int     mx;                     /* MX value if found via MX records */
  80   int     sort_key;               /* MX*1000 plus random "fraction" */
  81   int     status;                 /* Usable, unusable, or unknown */
  82   int     why;                    /* Why host is unusable */
  83   int     last_try;               /* Time of last try if known */
  84   dnssec_status_t dnssec;
  85 } host_item;
  86
  87 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
  88 rewrite_headers field of a transport. */
  89
  90 typedef struct rewrite_rule {
  91   struct rewrite_rule *next;
  92   int     flags;
  93   uschar *key;
  94   uschar *replacement;
  95 } rewrite_rule;
  96
  97 /* This structure is used to pass back configuration data from the smtp
  98 transport to the outside world. It is used during callback processing. If ever
  99 another remote transport were implemented, it could use the same structure. */
 100
 101 typedef struct transport_feedback {
 102   uschar *interface;
 103   uschar *port;
 104   uschar *protocol;
 105   uschar *hosts;
 106   uschar *helo_data;
 107   BOOL   hosts_override;
 108   BOOL   hosts_randomize;
 109   BOOL   gethostbyname;
 110   BOOL   qualify_single;
 111   BOOL   search_parents;
 112 } transport_feedback;
 113
 114 /* Routers, transports, and authenticators have similar data blocks. Each
 115 driver that is compiled into the code is represented by a xxx_info block; the
 116 active drivers are represented by a chain of xxx_instance blocks. To make it
 117 possible to use the same code for reading the configuration files for all
 118 three, the layout of the start of the blocks is kept the same, and represented
 119 by the generic structures driver_info and driver_instance. */
 120
 121 typedef struct driver_instance {
 122   struct driver_instance *next;
 123   uschar *name;                   /* Instance name */
 124   struct driver_info *info;       /* Points to info for this driver */
 125   void   *options_block;          /* Pointer to private options */
 126   uschar *driver_name;            /* All start with this generic option */
 127 } driver_instance;
 128
 129 typedef struct driver_info {
 130   uschar *driver_name;            /* Name of driver */
 131   optionlist *options;            /* Table of private options names */
 132   int    *options_count;          /* -> Number of entries in table */
 133   void   *options_block;          /* Points to default private block */
 134   int     options_len;            /* Length of same in bytes */
 135   void  (*init)(                  /* Initialization entry point */
 136     struct driver_instance *);
 137 } driver_info;
 138
 139
 140 /* Structure for holding information about the configured transports. Some
 141 of the generally accessible options are set from the configuration file; others
 142 are set by transport initialization, since they can only be set for certain
 143 transports. They need to be generally accessible, however, as they are used by
 144 the main transport code. */
 145
 146 typedef struct transport_instance {
 147   struct transport_instance *next;
 148   uschar *name;                   /* Instance name */
 149   struct transport_info *info;    /* Info for this driver */
 150   void *options_block;            /* Pointer to private options */
 151   uschar *driver_name;            /* Must be first */
 152   int   (*setup)(                 /* Setup entry point */
 153     struct transport_instance *,
 154     struct address_item *,
 155     struct transport_feedback *,  /* For passing back config data */
 156     uid_t,                        /* The uid that will be used */
 157     gid_t,                        /* The gid that will be used */
 158     uschar **);                   /* For an error message */
 159                                   /**************************************/
 160   int     batch_max;              /* )                                  */
 161   uschar *batch_id;               /* )                                  */
 162   uschar *home_dir;               /* ) Used only for local transports   */
 163   uschar *current_dir;            /* )                                  */
 164                                   /**************************************/
 165   uschar *expand_multi_domain;    /* )                                  */
 166   BOOL    multi_domain;           /* )                                  */
 167   BOOL    overrides_hosts;        /* ) Used only for remote transports  */
 168   int     max_addresses;          /* )                                  */
 169   int     connection_max_messages;/* )                                  */
 170                                   /**************************************/
 171   BOOL    deliver_as_creator;     /* Used only by pipe at present */
 172   BOOL    disable_logging;        /* For very weird requirements */
 173   BOOL    initgroups;             /* Initialize groups when setting uid */
 174   BOOL    uid_set;                /* uid is set */
 175   BOOL    gid_set;                /* gid is set */
 176   uid_t   uid;
 177   gid_t   gid;
 178   uschar *expand_uid;             /* Variable uid */
 179   uschar *expand_gid;             /* Variable gid */
 180   uschar *warn_message;           /* Used only by appendfile at present */
 181   uschar *shadow;                 /* Name of shadow transport */
 182   uschar *shadow_condition;       /* Condition for running it */
 183   uschar *filter_command;         /* For on-the-fly-filtering */
 184   uschar *add_headers;            /* Add these headers */
 185   uschar *remove_headers;         /* Remove these headers */
 186   uschar *return_path;            /* Overriding (rewriting) return path */
 187   uschar *debug_string;           /* Debugging output */
 188   uschar *max_parallel;           /* Number of concurrent instances */
 189   uschar *message_size_limit;     /* Biggest message this transport handles */
 190   uschar *headers_rewrite;        /* Rules for rewriting headers */
 191   rewrite_rule *rewrite_rules;    /* Parsed rewriting rules */
 192   int     rewrite_existflags;     /* Bits showing which headers are rewritten */
 193   int     filter_timeout;         /* For transport filter timing */
 194   BOOL    body_only;              /* Deliver only the body */
 195   BOOL    delivery_date_add;      /* Add Delivery-Date header */
 196   BOOL    envelope_to_add;        /* Add Envelope-To header */
 197   BOOL    headers_only;           /* Deliver only the headers */
 198   BOOL    rcpt_include_affixes;   /* TRUE to retain affixes in RCPT commands */
 199   BOOL    return_path_add;        /* Add Return-Path header */
 200   BOOL    return_output;          /* TRUE if output should always be returned */
 201   BOOL    return_fail_output;     /* ditto, but only on failure */
 202   BOOL    log_output;             /* Similarly for logging */
 203   BOOL    log_fail_output;
 204   BOOL    log_defer_output;
 205   BOOL    retry_use_local_part;   /* Defaults true for local, false for remote */
 206 #ifndef DISABLE_EVENT
 207   uschar  *event_action;          /* String to expand on notable events */
 208 #endif
 209 } transport_instance;
 210
 211
 212 /* Structure for holding information about a type of transport. The first six
 213 fields must match driver_info above. */
 214
 215 typedef struct transport_info {
 216   uschar *driver_name;            /* Driver name */
 217   optionlist *options;            /* Table of private options names */
 218   int    *options_count;          /* -> Number of entries in table */
 219   void   *options_block;          /* Points to default private block */
 220   int     options_len;            /* Length of same in bytes */
 221   void (*init)(                   /* Initialization function */
 222     struct transport_instance *);
 223 /****/
 224   BOOL (*code)(                   /* Main entry point */
 225     transport_instance *,
 226     struct address_item *);
 227   void (*tidyup)(                 /* Tidyup function */
 228     struct transport_instance *);
 229   void  (*closedown)(             /* For closing down a passed channel */
 230     struct transport_instance *);
 231   BOOL    local;                  /* TRUE for local transports */
 232 } transport_info;
 233
 234
 235 /* smtp transport datachunk callback */
 236
 237 #define tc_reap_prev    BIT(0)  /* Flags: reap previous SMTP cmd responses */
 238 #define tc_chunk_last   BIT(1)  /* annotate chunk SMTP cmd as LAST */
 239
 240 struct transport_context;
 241 typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
 242
 243 /* Structure for information about a delivery-in-progress */
 244
 245 typedef struct transport_context {
 246   union {                       /* discriminated by option topt_output_string */
 247     int                   fd;   /* file descriptor to write message to */
 248     gstring *             msg;  /* allocated string with written message */
 249   } u;
 250   transport_instance    * tblock;               /* transport */
 251   struct address_item   * addr;
 252   uschar                * check_string;         /* string replacement */
 253   uschar                * escape_string;
 254   int                     options;              /* output processing topt_* */
 255
 256   /* items below only used with option topt_use_bdat */
 257   tpt_chunk_cmd_cb        chunk_cb;             /* per-datachunk callback */
 258   void                  * smtp_context;
 259 } transport_ctx;
 260
 261
 262
 263 typedef struct {
 264   uschar *request;
 265   uschar *require;
 266 } dnssec_domains;
 267
 268 /* Structure for holding information about the configured routers. */
 269
 270 typedef struct router_instance {
 271   struct router_instance *next;
 272   uschar *name;
 273   struct router_info *info;
 274   void   *options_block;          /* Pointer to private options */
 275   uschar *driver_name;            /* Must be first */
 276
 277   uschar *address_data;           /* Arbitrary data */
 278 #ifdef EXPERIMENTAL_BRIGHTMAIL
 279   uschar *bmi_rule;               /* Brightmail AntiSpam rule checking */
 280 #endif
 281   uschar *cannot_route_message;   /* Used when routing fails */
 282   uschar *condition;              /* General condition */
 283   uschar *current_directory;      /* For use during delivery */
 284   uschar *debug_string;           /* Debugging output */
 285   uschar *domains;                /* Specific domains */
 286   uschar *errors_to;              /* Errors address */
 287   uschar *expand_gid;             /* Expanded gid string */
 288   uschar *expand_uid;             /* Expanded uid string */
 289   uschar *expand_more;            /* Expanded more string */
 290   uschar *expand_unseen;          /* Expanded unseen string */
 291   uschar *extra_headers;          /* Additional headers */
 292   uschar *fallback_hosts;         /* For remote transports (text list) */
 293   uschar *home_directory;         /* For use during delivery */
 294   uschar *ignore_target_hosts;    /* Target hosts to ignore */
 295   uschar *local_parts;            /* Specific local parts */
 296   uschar *pass_router_name;       /* Router for passed address */
 297   uschar *prefix;                 /* Address prefix */
 298   uschar *redirect_router_name;   /* Router for generated address */
 299   uschar *remove_headers;         /* Removed headers */
 300   uschar *require_files;          /* File checks before router is run */
 301   uschar *router_home_directory;  /* For use while routing */
 302   uschar *self;                   /* Text option for handling self reference */
 303   uschar *senders;                /* Specific senders */
 304   uschar *suffix;                 /* Address suffix */
 305   uschar *translate_ip_address;   /* IP address translation fudgery */
 306   uschar *transport_name;         /* Transport name */
 307
 308   BOOL    address_test;           /* Use this router when testing addresses */
 309 #ifdef EXPERIMENTAL_BRIGHTMAIL
 310   BOOL    bmi_deliver_alternate;  /* TRUE => BMI said that message should be delivered to alternate location */
 311   BOOL    bmi_deliver_default;    /* TRUE => BMI said that message should be delivered to default location */
 312   BOOL    bmi_dont_deliver;       /* TRUE => BMI said that message should not be delivered at all */
 313 #endif
 314   BOOL    expn;                   /* Use this router when processing EXPN */
 315   BOOL    caseful_local_part;     /* TRUE => don't lowercase */
 316   BOOL    check_local_user;       /* TRUE => check local user */
 317   BOOL    disable_logging;        /* For very weird requirements */
 318   BOOL    fail_verify_recipient;  /* Fail verify if recipient match this router */
 319   BOOL    fail_verify_sender;     /* Fail verify if sender match this router */
 320   BOOL    gid_set;                /* Flag to indicate gid is set */
 321   BOOL    initgroups;             /* TRUE if initgroups is required */
 322   BOOL    log_as_local;           /* TRUE logs as a local delivery */
 323   BOOL    more;                   /* If FALSE, do no more if this one fails */
 324   BOOL    pass_on_timeout;        /* Treat timeout DEFERs as fails */
 325   BOOL    prefix_optional;        /* Just what it says */
 326   BOOL    repeat_use;             /* If FALSE, skip if ancestor used it */
 327   BOOL    retry_use_local_part;   /* Just what it says */
 328   BOOL    same_domain_copy_routing; /* TRUE => copy routing for same domain */
 329   BOOL    self_rewrite;           /* TRUE to rewrite headers if making local */
 330   BOOL    suffix_optional;        /* As it says */
 331   BOOL    verify_only;            /* Skip this router if not verifying */
 332   BOOL    verify_recipient;       /* Use this router when verifying a recipient*/
 333   BOOL    verify_sender;          /* Use this router when verifying a sender */
 334   BOOL    uid_set;                /* Flag to indicate uid is set */
 335   BOOL    unseen;                 /* If TRUE carry on, even after success */
 336   BOOL    dsn_lasthop;            /* If TRUE, this router is a DSN endpoint */
 337
 338   int     self_code;              /* Encoded version of "self" */
 339   uid_t   uid;                    /* Fixed uid value */
 340   gid_t   gid;                    /* Fixed gid value */
 341
 342   host_item *fallback_hostlist;   /* For remote transport (block chain) */
 343   transport_instance *transport;  /* Transport block (when found) */
 344   struct router_instance *pass_router; /* Actual router for passed address */
 345   struct router_instance *redirect_router; /* Actual router for generated address */
 346
 347   dnssec_domains dnssec;
 348 } router_instance;
 349
 350
 351 /* Structure for holding information about a type of router. The first six
 352 fields must match driver_info above. */
 353
 354 typedef struct router_info {
 355   uschar *driver_name;
 356   optionlist *options;            /* Table of private options names */
 357   int    *options_count;          /* -> Number of entries in table */
 358   void   *options_block;          /* Points to default private block */
 359   int     options_len;            /* Length of same in bytes */
 360   void (*init)(                   /* Initialization function */
 361     struct router_instance *);
 362 /****/
 363   int (*code)(                    /* Main entry point */
 364     router_instance *,
 365     struct address_item *,
 366     struct passwd *,
 367     int,
 368     struct address_item **,
 369     struct address_item **,
 370     struct address_item **,
 371     struct address_item **);
 372   void (*tidyup)(                 /* Tidyup function */
 373     struct router_instance *);
 374   int     ri_flags;               /* Descriptive flags */
 375 } router_info;
 376
 377
 378 /* Structure for holding information about a lookup type. */
 379
 380 #include "lookupapi.h"
 381
 382
 383 /* Structure for holding information about the configured authentication
 384 mechanisms */
 385
 386 typedef struct auth_instance {
 387   struct auth_instance *next;
 388   uschar *name;                   /* Exim instance name */
 389   struct auth_info *info;         /* Pointer to driver info block */
 390   void   *options_block;          /* Pointer to private options */
 391   uschar *driver_name;            /* Must be first */
 392   uschar *advertise_condition;    /* Are we going to advertise this?*/
 393   uschar *client_condition;       /* Should the client try this? */
 394   uschar *public_name;            /* Advertised name */
 395   uschar *set_id;                 /* String to set when server as authenticated id */
 396   uschar *set_client_id;          /* String to set when client as client_authenticated id */
 397   uschar *mail_auth_condition;    /* Condition for AUTH on MAIL command */
 398   uschar *server_debug_string;    /* Debugging output */
 399   uschar *server_condition;       /* Authorization condition */
 400   BOOL    client;                 /* TRUE if client option(s) set */
 401   BOOL    server;                 /* TRUE if server options(s) set */
 402   BOOL    advertised;             /* Set TRUE when advertised */
 403 } auth_instance;
 404
 405
 406 /* Structure for holding information about an authentication mechanism. The
 407 first six fields must match driver_info above. */
 408
 409 typedef struct auth_info {
 410   uschar *driver_name;            /* e.g. "condition" */
 411   optionlist *options;            /* Table of private options names */
 412   int    *options_count;          /* -> Number of entries in table */
 413   void   *options_block;          /* Points to default private block */
 414   int     options_len;            /* Length of same in bytes */
 415   void (*init)(                   /* initialization function */
 416     struct auth_instance *);
 417 /****/
 418   int (*servercode)(              /* server function */
 419     auth_instance *,              /* the instance data */
 420     uschar *);                    /* rest of AUTH command */
 421   int (*clientcode)(              /* client function */
 422     struct auth_instance *,
 423     struct smtp_inblock *,        /* socket and input buffer */
 424     struct smtp_outblock *,       /* socket and output buffer */
 425     int,                          /* command timeout */
 426     uschar *,                     /* buffer for reading response */
 427     int);                         /* sizeof buffer */
 428   void (*version_report)(         /* diagnostic version reporting */
 429     FILE *);                      /* I/O stream to print to */
 430 } auth_info;
 431
 432
 433 /* Structure for holding a single IP address and port; used for the chain of
 434 addresses and ports for the local host. Make the char string large enough to
 435 hold an IPv6 address. */
 436
 437 typedef struct ip_address_item {
 438   struct ip_address_item *next;
 439   int    port;
 440   BOOL   v6_include_v4;            /* Used in the daemon */
 441   uschar address[46];
 442 } ip_address_item;
 443
 444 /* Structure for chaining together arbitrary strings. */
 445
 446 typedef struct string_item {
 447   struct string_item *next;
 448   uschar *text;
 449 } string_item;
 450
 451 /* Information about a soft delivery failure, for use when calculating
 452 retry information. It's separate from the address block, because there
 453 can be a chain of them for SMTP deliveries where multiple IP addresses
 454 can be tried. */
 455
 456 typedef struct retry_item {
 457   struct retry_item *next;        /* for chaining */
 458   uschar *key;                    /* string identifying host/address/message */
 459   int     basic_errno;            /* error code for this destination */
 460   int     more_errno;             /* additional error information */
 461   uschar *message;                /* local error message */
 462   int     flags;                  /* see below */
 463 } retry_item;
 464
 465 /* Retry data flags */
 466
 467 #define rf_delete   0x0001        /* retry info is to be deleted */
 468 #define rf_host     0x0002        /* retry info is for a remote host */
 469 #define rf_message  0x0004        /* retry info is for a host+message */
 470
 471 /* Information about a constructed message that is to be sent using the
 472 autoreply transport. This is pointed to from the address block. */
 473
 474 typedef struct reply_item {
 475   uschar *from;                   /* ) */
 476   uschar *reply_to;               /* ) */
 477   uschar *to;                     /* ) */
 478   uschar *cc;                     /* ) specific header fields */
 479   uschar *bcc;                    /* ) */
 480   uschar *subject;                /* ) */
 481   uschar *headers;                /* misc other headers, concatenated */
 482   uschar *text;                   /* text string body */
 483   uschar *file;                   /* file body */
 484   BOOL    file_expand;            /* expand the body */
 485   int     expand_forbid;          /* expansion lockout flags */
 486   uschar *logfile;                /* file to keep a log in */
 487   uschar *oncelog;                /* file to keep records in for once only */
 488   time_t  once_repeat;            /* time to repeat "once only" */
 489   BOOL    return_message;         /* send back the original message */
 490 } reply_item;
 491
 492
 493 /* The address_item structure contains many fields which are used at various
 494 times while delivering a message. Some are used only for remote deliveries;
 495 some only for local. A particular set of fields is copied whenever a child
 496 address is created. For convenience, we keep those fields in a separate
 497 sub-structure so they can be copied in one go. This also means I won't forget
 498 to edit the various copying places when new to-be-copied fields are added. */
 499
 500 typedef struct address_item_propagated {
 501   uschar *address_data;           /* arbitrary data to keep with the address */
 502   uschar *domain_data;            /* from "domains" lookup */
 503   uschar *localpart_data;         /* from "local_parts" lookup */
 504   uschar *errors_address;         /* where to send errors (NULL => sender) */
 505   header_line *extra_headers;     /* additional headers */
 506   uschar *remove_headers;         /* list of those to remove */
 507
 508   #ifdef EXPERIMENTAL_SRS
 509   uschar *srs_sender;             /* Change return path when delivering */
 510   #endif
 511   BOOL    ignore_error:1;         /* ignore delivery error */
 512   #ifdef SUPPORT_I18N
 513   BOOL    utf8_msg:1;             /* requires SMTPUTF8 processing */
 514   BOOL    utf8_downcvt:1;         /* mandatory downconvert on delivery */
 515   BOOL    utf8_downcvt_maybe:1;   /* optional downconvert on delivery */
 516   #endif
 517 } address_item_propagated;
 518
 519
 520 /* The main address structure. Note that fields that are to be copied to
 521 generated addresses should be put in the address_item_propagated structure (see
 522 above) rather than directly into the address_item structure. */
 523
 524 typedef struct address_item {
 525   struct address_item *next;      /* for chaining addresses */
 526   struct address_item *parent;    /* parent address */
 527   struct address_item *first;     /* points to first after group delivery */
 528   struct address_item *dupof;     /* points to address this is a duplicate of */
 529
 530   router_instance *start_router;  /* generated address starts here */
 531   router_instance *router;        /* the router that routed */
 532   transport_instance *transport;  /* the transport to use */
 533
 534   host_item *host_list;           /* host data for the transport */
 535   host_item *host_used;           /* host that took delivery or failed hard */
 536   host_item *fallback_hosts;      /* to try if delivery defers */
 537
 538   reply_item *reply;              /* data for autoreply */
 539   retry_item *retries;            /* chain of retry information */
 540
 541   uschar *address;                /* address being delivered or routed */
 542   uschar *unique;                 /* used for disambiguating */
 543   uschar *cc_local_part;          /* caseful local part */
 544   uschar *lc_local_part;          /* lowercased local part */
 545   uschar *local_part;             /* points to cc or lc version */
 546   uschar *prefix;                 /* stripped prefix of local part */
 547   uschar *suffix;                 /* stripped suffix of local part */
 548   const uschar *domain;           /* working domain (lower cased) */
 549
 550   uschar *address_retry_key;      /* retry key including full address */
 551   uschar *domain_retry_key;       /* retry key for domain only */
 552
 553   uschar *current_dir;            /* current directory for transporting */
 554   uschar *home_dir;               /* home directory for transporting */
 555   uschar *message;                /* error message */
 556   uschar *user_message;           /* error message that can be sent over SMTP
 557                                      or quoted in bounce message */
 558   uschar *onetime_parent;         /* saved original parent for onetime */
 559   uschar **pipe_expandn;          /* numeric expansions for pipe from filter */
 560   uschar *return_filename;        /* name of return file */
 561   uschar *self_hostname;          /* after self=pass */
 562   uschar *shadow_message;         /* info about shadow transporting */
 563
 564 #ifdef SUPPORT_TLS
 565   uschar *cipher;                 /* Cipher used for transport */
 566   void   *ourcert;                /* Certificate offered to peer, binary */
 567   void   *peercert;               /* Certificate from peer, binary */
 568   uschar *peerdn;                 /* DN of server's certificate */
 569   int    ocsp;                    /* OCSP status of peer cert */
 570 #endif
 571
 572 #ifdef EXPERIMENTAL_DSN_INFO
 573   const uschar *smtp_greeting;    /* peer self-identification */
 574   const uschar *helo_response;    /* peer message */
 575 #endif
 576
 577   uschar *authenticator;          /* auth driver name used by transport */
 578   uschar *auth_id;                /* auth "login" name used by transport */
 579   uschar *auth_sndr;              /* AUTH arg to SMTP MAIL, used by transport */
 580
 581   uschar *dsn_orcpt;              /* DSN orcpt value */
 582   int     dsn_flags;              /* DSN flags */
 583   int     dsn_aware;              /* DSN aware flag */
 584
 585   uid_t   uid;                    /* uid for transporting */
 586   gid_t   gid;                    /* gid for transporting */
 587
 588                                   /* flags */
 589   struct {
 590     BOOL af_allow_file:1;               /* allow file in generated address */
 591     BOOL af_allow_pipe:1;               /* allow pipe in generated address */
 592     BOOL af_allow_reply:1;              /* allow autoreply in generated address */
 593     BOOL af_dr_retry_exists:1;          /* router retry record exists */
 594     BOOL af_expand_pipe:1;              /* expand pipe arguments */
 595     BOOL af_file:1;                     /* file delivery; always with pfr */
 596     BOOL af_gid_set:1;                  /* gid field is set */
 597     BOOL af_home_expanded:1;            /* home_dir is already expanded */
 598     BOOL af_initgroups:1;               /* use initgroups() for local transporting */
 599     BOOL af_local_host_removed:1;       /* local host was backup */
 600     BOOL af_lt_retry_exists:1;          /* local transport retry exists */
 601     BOOL af_pfr:1;                      /* pipe or file or reply delivery */
 602     BOOL af_retry_skipped:1;            /* true if retry caused some skipping */
 603     BOOL af_retry_timedout:1;           /* true if retry timed out */
 604     BOOL af_uid_set:1;                  /* uid field is set */
 605     BOOL af_hide_child:1;               /* hide child in bounce/defer msgs */
 606     BOOL af_sverify_told:1;             /* sender verify failure notified */
 607     BOOL af_verify_pmfail:1;            /* verify failure was postmaster callout */
 608     BOOL af_verify_nsfail:1;            /* verify failure was null sender callout */
 609     BOOL af_homonym:1;                  /* an ancestor has same address */
 610     BOOL af_verify_routed:1;            /* for cached sender verify: routed OK */
 611     BOOL af_verify_callout:1;           /* for cached sender verify: callout was specified */
 612     BOOL af_include_affixes:1;          /* delivered with affixes in RCPT */
 613     BOOL af_cert_verified:1;            /* delivered with verified TLS cert */
 614     BOOL af_pass_message:1;             /* pass message in bounces */
 615     BOOL af_bad_reply:1;                /* filter could not generate autoreply */
 616     BOOL af_tcp_fastopen_conn:1;        /* delivery connection used TCP Fast Open */
 617     BOOL af_tcp_fastopen:1;             /* delivery usefuly used TCP Fast Open */
 618 #ifndef DISABLE_PRDR
 619     BOOL af_prdr_used:1;                /* delivery used SMTP PRDR */
 620 #endif
 621     BOOL af_chunking_used:1;            /* delivery used SMTP CHUNKING */
 622     BOOL af_force_command:1;            /* force_command in pipe transport */
 623 #ifdef EXPERIMENTAL_DANE
 624     BOOL af_dane_verified:1;            /* TLS cert verify done with DANE */
 625 #endif
 626 #ifdef SUPPORT_I18N
 627     BOOL af_utf8_downcvt:1;             /* downconvert was done for delivery */
 628 #endif
 629   } flags;
 630
 631   unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
 632   unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
 633   int     mode;                   /* mode for local transporting to a file */
 634   int     more_errno;             /* additional error information */
 635                                   /* (may need to hold a timestamp) */
 636   unsigned int delivery_usec;     /* subsecond part of delivery time */
 637
 638   short int basic_errno;          /* status after failure */
 639   unsigned short child_count;     /* number of child addresses */
 640   short int return_file;          /* fileno of return data file */
 641   short int special_action;       /* ( used when when deferred or failed */
 642                                   /* (  also  */
 643                                   /* ( contains = or - when successful SMTP delivered */
 644                                   /* (  also  */
 645                                   /* ( contains verify rc in sender verify cache */
 646   short int transport_return;     /* result of delivery attempt */
 647   address_item_propagated prop;   /* fields that are propagated to children */
 648 } address_item;
 649
 650 /* The table of header names consists of items of this type */
 651
 652 typedef struct {
 653   uschar *name;
 654   int     len;
 655   BOOL    allow_resent;
 656   int     htype;
 657 } header_name;
 658
 659 /* Chain of information about errors (e.g. bad addresses) */
 660
 661 typedef struct error_block {
 662   struct error_block *next;
 663   const uschar *text1;
 664   uschar *text2;
 665 } error_block;
 666
 667 /* Chain of file names when processing the queue */
 668
 669 typedef struct queue_filename {
 670   struct queue_filename *next;
 671   uschar dir_uschar;
 672   uschar text[1];
 673 } queue_filename;
 674
 675 /* Chain of items of retry information, read from the retry config. */
 676
 677 typedef struct retry_rule {
 678   struct retry_rule *next;
 679   int    rule;
 680   int    timeout;
 681   int    p1;
 682   int    p2;
 683 } retry_rule;
 684
 685 typedef struct retry_config {
 686   struct retry_config *next;
 687   uschar *pattern;
 688   int     basic_errno;
 689   int     more_errno;
 690   uschar *senders;
 691   retry_rule *rules;
 692 } retry_config;
 693
 694 /* Structure for each node in a tree, of which there are various kinds */
 695
 696 typedef struct tree_node {
 697   struct tree_node *left;         /* pointer to left child */
 698   struct tree_node *right;        /* pointer to right child */
 699   union
 700     {
 701     void  *ptr;                   /* pointer to data */
 702     int val;                      /* or integer data */
 703     } data;
 704   uschar  balance;                /* balancing factor */
 705   uschar  name[1];                /* node name - variable length */
 706 } tree_node;
 707
 708 /* Structure for holding time-limited data such as DNS returns.
 709 We use this rather than extending tree_node to avoid wasting
 710 space for most tree use (variables...) at the cost of complexity
 711 for the lookups cache */
 712
 713 typedef struct expiring_data {
 714   time_t expiry;                  /* if nonzero, data invalid after this time */
 715   void   *ptr;                    /* pointer to data */
 716 } expiring_data;
 717
 718 /* Structure for holding the handle and the cached last lookup for searches.
 719 This block is pointed to by the tree entry for the file. The file can get
 720 closed if too many are opened at once. There is a LRU chain for deciding which
 721 to close. */
 722
 723 typedef struct search_cache {
 724   void   *handle;                 /* lookup handle, or NULL if closed */
 725   int search_type;                /* search type */
 726   tree_node *up;                  /* LRU up pointer */
 727   tree_node *down;                /* LRU down pointer */
 728   tree_node *item_cache;          /* tree of cached results */
 729 } search_cache;
 730
 731 /* Structure for holding a partially decoded DNS record; the name has been
 732 uncompressed, but the data pointer is into the raw data. */
 733
 734 typedef struct {
 735   uschar        name[DNS_MAXNAME];      /* domain name */
 736   int           type;                   /* record type */
 737   unsigned short ttl;                   /* time-to-live, seconds */
 738   int           size;                   /* size of data */
 739   const uschar *data;                   /* pointer to data */
 740 } dns_record;
 741
 742 /* Structure for holding the result of a DNS query. */
 743
 744 typedef struct {
 745   int     answerlen;              /* length of the answer */
 746   uschar  answer[MAXPACKET];      /* the answer itself */
 747 } dns_answer;
 748
 749 /* Structure for holding the intermediate data while scanning a DNS answer
 750 block. */
 751
 752 typedef struct {
 753   int            rrcount;         /* count of RRs in the answer */
 754   const uschar *aptr;             /* pointer in the answer while scanning */
 755   dns_record     srr;             /* data from current record in scan */
 756 } dns_scan;
 757
 758 /* Structure for holding a chain of IP addresses that are extracted from
 759 an A, AAAA, or A6 record. For the first two, there is only ever one address,
 760 but the chaining feature of A6 allows for several addresses to be realized from
 761 a single initial A6 record. The structure defines the address field of length
 762 1. In use, a suitable sized block is obtained to hold the complete textual
 763 address. */
 764
 765 typedef struct dns_address {
 766   struct dns_address *next;
 767   uschar  address[1];
 768 } dns_address;
 769
 770 /* Structure used for holding intermediate data during MD5 computations. */
 771
 772 typedef struct md5 {
 773   unsigned int length;
 774   unsigned int abcd[4];
 775   }
 776 md5;
 777
 778 /* Structure used for holding intermediate data during SHA-1 computations. */
 779
 780 typedef struct sha1 {
 781   unsigned int H[5];
 782   unsigned int length;
 783   }
 784 sha1;
 785
 786 /* Structure used to hold incoming packets of SMTP responses for a specific
 787 socket. The packets which may contain multiple lines (and in some cases,
 788 multiple responses). */
 789
 790 typedef struct smtp_inblock {
 791   int     sock;                   /* the socket */
 792   int     buffersize;             /* the size of the buffer */
 793   uschar *ptr;                    /* current position in the buffer */
 794   uschar *ptrend;                 /* end of data in the buffer */
 795   uschar *buffer;                 /* the buffer itself */
 796 } smtp_inblock;
 797
 798 /* Structure used to hold buffered outgoing packets of SMTP commands for a
 799 specific socket. The packets which may contain multiple lines when pipelining
 800 is in use. */
 801
 802 typedef struct smtp_outblock {
 803   int     sock;                   /* the socket */
 804   int     cmd_count;              /* count of buffered commands */
 805   int     buffersize;             /* the size of the buffer */
 806   BOOL    authenticating;         /* TRUE when authenticating */
 807   uschar *ptr;                    /* current position in the buffer */
 808   uschar *buffer;                 /* the buffer itself */
 809 } smtp_outblock;
 810
 811 /* Structure to hold information about the source of redirection information */
 812
 813 typedef struct redirect_block {
 814   uschar *string;                 /* file name or string */
 815   uid_t  *owners;                 /* allowed file owners */
 816   gid_t  *owngroups;              /* allowed file groups */
 817   struct passwd *pw;              /* possible owner if not NULL */
 818   int     modemask;               /* forbidden bits */
 819   BOOL    isfile;                 /* TRUE if string is a file name */
 820   BOOL    check_owner;            /* TRUE, FALSE, or TRUE_UNSET */
 821   BOOL    check_group;            /* TRUE, FALSE, or TRUE_UNSET */
 822 } redirect_block;
 823
 824 /* Structure for passing arguments to check_host() */
 825
 826 typedef struct check_host_block {
 827   const uschar *host_name;
 828   const uschar *host_address;
 829   const uschar *host_ipv4;
 830   BOOL   negative;
 831 } check_host_block;
 832
 833 /* Structure for remembering lookup data when caching the result of
 834 a lookup in a named list. */
 835
 836 typedef struct namedlist_cacheblock {
 837   struct namedlist_cacheblock *next;
 838   uschar *key;
 839   uschar *data;
 840 } namedlist_cacheblock;
 841
 842 /* Structure for holding data for an entry in a named list */
 843
 844 typedef struct namedlist_block {
 845   const uschar *string;              /* the list string */
 846   namedlist_cacheblock *cache_data;  /* cached domain_data or localpart_data */
 847   int number;                        /* the number of the list for caching */
 848 } namedlist_block;
 849
 850 /* Structures for Access Control Lists */
 851
 852 typedef struct acl_condition_block {
 853   struct acl_condition_block *next;
 854   uschar *arg;
 855   int type;
 856   union {
 857     BOOL negated;
 858     uschar *varname;
 859   } u;
 860 } acl_condition_block;
 861
 862 typedef struct acl_block {
 863   struct acl_block *next;
 864   acl_condition_block *condition;
 865   int verb;
 866 } acl_block;
 867
 868 /* smtp transport calc outbound_ip */
 869 typedef BOOL (*oicf) (uschar *message_id, void *data);
 870
 871 /* DKIM information for transport */
 872 struct ob_dkim {
 873   uschar *dkim_domain;
 874   uschar *dkim_identity;
 875   uschar *dkim_private_key;
 876   uschar *dkim_selector;
 877   uschar *dkim_canon;
 878   uschar *dkim_sign_headers;
 879   uschar *dkim_strict;
 880   uschar *dkim_hash;
 881   BOOL    dot_stuffed;
 882 };
 883
 884 /* End of structs.h */