src/src/structs.h

   1 /* $Cambridge: exim/src/src/structs.h,v 1.17 2009/11/16 19:50:37 nm4 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2009 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* Definitions of various structures. In addition, those that are visible for
  12 the compilation of local_scan() are defined in local_scan.h. These are
  13
  14   header_line
  15   optionlist
  16   recipient_item
  17
  18 For those declared here, we have to pre-declare some because of mutually
  19 recursive definitions in the auths, routers, and transports blocks. */
  20
  21 struct address_item;
  22 struct auth_info;
  23 struct driver_info;
  24 struct director_info;
  25 struct smtp_inblock;
  26 struct smtp_outblock;
  27 struct transport_info;
  28 struct router_info;
  29
  30 /* Structure for remembering macros for the configuration file */
  31
  32 typedef struct macro_item {
  33   struct  macro_item *next;
  34   BOOL    command_line;
  35   uschar *replacement;
  36   uschar  name[1];
  37 } macro_item;
  38
  39 /* Structure for bit tables for debugging and logging */
  40
  41 typedef struct bit_table {
  42   uschar *name;
  43   unsigned 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 /* Structure for holding information about a host for use mainly by routers,
  57 but also used when checking lists of hosts and when transporting. Looking up
  58 host addresses is done using this structure. */
  59
  60 typedef struct host_item {
  61   struct host_item *next;
  62   uschar *name;                   /* Host name */
  63   uschar *address;                /* IP address in text form */
  64   int     port;                   /* port value in host order (if SRV lookup) */
  65   int     mx;                     /* MX value if found via MX records */
  66   int     sort_key;               /* MX*1000 plus random "fraction" */
  67   int     status;                 /* Usable, unusable, or unknown */
  68   int     why;                    /* Why host is unusable */
  69   int     last_try;               /* Time of last try if known */
  70 } host_item;
  71
  72 /* Chain of rewrite rules, read from the rewrite config, or parsed from the
  73 rewrite_headers field of a transport. */
  74
  75 typedef struct rewrite_rule {
  76   struct rewrite_rule *next;
  77   int     flags;
  78   uschar *key;
  79   uschar *replacement;
  80 } rewrite_rule;
  81
  82 /* This structure is used to pass back configuration data from the smtp
  83 transport to the outside world. It is used during callback processing. If ever
  84 another remote transport were implemented, it could use the same structure. */
  85
  86 typedef struct transport_feedback {
  87   uschar *interface;
  88   uschar *port;
  89   uschar *protocol;
  90   uschar *hosts;
  91   uschar *helo_data;
  92   BOOL   hosts_override;
  93   BOOL   hosts_randomize;
  94   BOOL   gethostbyname;
  95   BOOL   qualify_single;
  96   BOOL   search_parents;
  97 } transport_feedback;
  98
  99 /* Routers, transports, and authenticators have similar data blocks. Each
 100 driver that is compiled into the code is represented by a xxx_info block; the
 101 active drivers are represented by a chain of xxx_instance blocks. To make it
 102 possible to use the same code for reading the configuration files for all
 103 three, the layout of the start of the blocks is kept the same, and represented
 104 by the generic structures driver_info and driver_instance. */
 105
 106 typedef struct driver_instance {
 107   struct driver_instance *next;
 108   uschar *name;                   /* Instance name */
 109   struct driver_info *info;       /* Points to info for this driver */
 110   void   *options_block;          /* Pointer to private options */
 111   uschar *driver_name;            /* All start with this generic option */
 112 } driver_instance;
 113
 114 typedef struct driver_info {
 115   uschar *driver_name;            /* Name of driver */
 116   optionlist *options;            /* Table of private options names */
 117   int    *options_count;          /* -> Number of entries in table */
 118   void   *options_block;          /* Points to default private block */
 119   int     options_len;            /* Length of same in bytes */
 120   void  (*init)(                  /* Initialization entry point */
 121     struct driver_instance *);
 122 } driver_info;
 123
 124
 125 /* Structure for holding information about the configured transports. Some
 126 of the generally accessible options are set from the configuration file; others
 127 are set by transport initialization, since they can only be set for certain
 128 transports. They need to be generally accessible, however, as they are used by
 129 the main transport code. */
 130
 131 typedef struct transport_instance {
 132   struct transport_instance *next;
 133   uschar *name;                   /* Instance name */
 134   struct transport_info *info;    /* Info for this driver */
 135   void *options_block;            /* Pointer to private options */
 136   uschar *driver_name;            /* Must be first */
 137   int   (*setup)(                 /* Setup entry point */
 138     struct transport_instance *,
 139     struct address_item *,
 140     struct transport_feedback *,  /* For passing back config data */
 141     uid_t,                        /* The uid that will be used */
 142     gid_t,                        /* The gid that will be used */
 143     uschar **);                   /* For an error message */
 144                                   /**************************************/
 145   int     batch_max;              /* )                                  */
 146   uschar *batch_id;               /* )                                  */
 147   uschar *home_dir;               /* ) Used only for local transports   */
 148   uschar *current_dir;            /* )                                  */
 149                                   /**************************************/
 150   BOOL    multi_domain;           /* )                                  */
 151   BOOL    overrides_hosts;        /* ) Used only for remote transports  */
 152   int     max_addresses;          /* )                                  */
 153   int     connection_max_messages;/* )                                  */
 154                                   /**************************************/
 155   BOOL    deliver_as_creator;     /* Used only by pipe at present */
 156   BOOL    disable_logging;        /* For very weird requirements */
 157   BOOL    initgroups;             /* Initialize groups when setting uid */
 158   BOOL    uid_set;                /* uid is set */
 159   BOOL    gid_set;                /* gid is set */
 160   uid_t   uid;
 161   gid_t   gid;
 162   uschar *expand_uid;             /* Variable uid */
 163   uschar *expand_gid;             /* Variable gid */
 164   uschar *warn_message;           /* Used only by appendfile at present */
 165   uschar *shadow;                 /* Name of shadow transport */
 166   uschar *shadow_condition;       /* Condition for running it */
 167   uschar *filter_command;         /* For on-the-fly-filtering */
 168   uschar *add_headers;            /* Add these headers */
 169   uschar *remove_headers;         /* Remove these headers */
 170   uschar *return_path;            /* Overriding (rewriting) return path */
 171   uschar *debug_string;           /* Debugging output */
 172   uschar *message_size_limit;     /* Biggest message this transport handles */
 173   uschar *headers_rewrite;        /* Rules for rewriting headers */
 174   rewrite_rule *rewrite_rules;    /* Parsed rewriting rules */
 175   int     rewrite_existflags;     /* Bits showing which headers are rewritten */
 176   int     filter_timeout;         /* For transport filter timing */
 177   BOOL    body_only;              /* Deliver only the body */
 178   BOOL    delivery_date_add;      /* Add Delivery-Date header */
 179   BOOL    envelope_to_add;        /* Add Envelope-To header */
 180   BOOL    headers_only;           /* Deliver only the headers */
 181   BOOL    rcpt_include_affixes;   /* TRUE to retain affixes in RCPT commands */
 182   BOOL    return_path_add;        /* Add Return-Path header */
 183   BOOL    return_output;          /* TRUE if output should always be returned */
 184   BOOL    return_fail_output;     /* ditto, but only on failure */
 185   BOOL    log_output;             /* Similarly for logging */
 186   BOOL    log_fail_output;
 187   BOOL    log_defer_output;
 188   BOOL    retry_use_local_part;   /* Defaults true for local, false for remote */
 189 } transport_instance;
 190
 191
 192 /* Structure for holding information about a type of transport. The first six
 193 fields must match driver_info above. */
 194
 195 typedef struct transport_info {
 196   uschar *driver_name;            /* Driver name */
 197   optionlist *options;            /* Table of private options names */
 198   int    *options_count;          /* -> Number of entries in table */
 199   void   *options_block;          /* Points to default private block */
 200   int     options_len;            /* Length of same in bytes */
 201   void (*init)(                   /* Initialization function */
 202     struct transport_instance *);
 203 /****/
 204   BOOL (*code)(                   /* Main entry point */
 205     transport_instance *,
 206     struct address_item *);
 207   void (*tidyup)(                 /* Tidyup function */
 208     struct transport_instance *);
 209   void  (*closedown)(             /* For closing down a passed channel */
 210     struct transport_instance *);
 211   BOOL    local;                  /* TRUE for local transports */
 212 } transport_info;
 213
 214
 215
 216 /* Structure for holding information about the configured routers. */
 217
 218 typedef struct router_instance {
 219   struct router_instance *next;
 220   uschar *name;
 221   struct router_info *info;
 222   void   *options_block;          /* Pointer to private options */
 223   uschar *driver_name;            /* Must be first */
 224
 225   uschar *address_data;           /* Arbitrary data */
 226 #ifdef EXPERIMENTAL_BRIGHTMAIL
 227   uschar *bmi_rule;               /* Brightmail AntiSpam rule checking */
 228 #endif
 229   uschar *cannot_route_message;   /* Used when routing fails */
 230   uschar *condition;              /* General condition */
 231   uschar *current_directory;      /* For use during delivery */
 232   uschar *debug_string;           /* Debugging output */
 233   uschar *domains;                /* Specific domains */
 234   uschar *errors_to;              /* Errors address */
 235   uschar *expand_gid;             /* Expanded gid string */
 236   uschar *expand_uid;             /* Expanded uid string */
 237   uschar *expand_more;            /* Expanded more string */
 238   uschar *expand_unseen;          /* Expanded unseen string */
 239   uschar *extra_headers;          /* Additional headers */
 240   uschar *fallback_hosts;         /* For remote transports (text list) */
 241   uschar *home_directory;         /* For use during delivery */
 242   uschar *ignore_target_hosts;    /* Target hosts to ignore */
 243   uschar *local_parts;            /* Specific local parts */
 244   uschar *pass_router_name;       /* Router for passed address */
 245   uschar *prefix;                 /* Address prefix */
 246   uschar *redirect_router_name;   /* Router for generated address */
 247   uschar *remove_headers;         /* Removed headers */
 248   uschar *require_files;          /* File checks before router is run */
 249   uschar *router_home_directory;  /* For use while routing */
 250   uschar *self;                   /* Text option for handling self reference */
 251   uschar *senders;                /* Specific senders */
 252   uschar *suffix;                 /* Address suffix */
 253   uschar *translate_ip_address;   /* IP address translation fudgery */
 254   uschar *transport_name;         /* Transport name */
 255
 256   BOOL    address_test;           /* Use this router when testing addresses */
 257 #ifdef EXPERIMENTAL_BRIGHTMAIL
 258   BOOL    bmi_deliver_alternate;  /* TRUE => BMI said that message should be delivered to alternate location */
 259   BOOL    bmi_deliver_default;    /* TRUE => BMI said that message should be delivered to default location */
 260   BOOL    bmi_dont_deliver;       /* TRUE => BMI said that message should not be delivered at all */
 261 #endif
 262   BOOL    expn;                   /* Use this router when processing EXPN */
 263   BOOL    caseful_local_part;     /* TRUE => don't lowercase */
 264   BOOL    check_local_user;       /* TRUE => check local user */
 265   BOOL    disable_logging;        /* For very weird requirements */
 266   BOOL    fail_verify_recipient;  /* Fail verify if recipient match this router */
 267   BOOL    fail_verify_sender;     /* Fail verify if sender match this router */
 268   BOOL    gid_set;                /* Flag to indicate gid is set */
 269   BOOL    initgroups;             /* TRUE if initgroups is required */
 270   BOOL    log_as_local;           /* TRUE logs as a local delivery */
 271   BOOL    more;                   /* If FALSE, do no more if this one fails */
 272   BOOL    pass_on_timeout;        /* Treat timeout DEFERs as fails */
 273   BOOL    prefix_optional;        /* Just what it says */
 274   BOOL    repeat_use;             /* If FALSE, skip if ancestor used it */
 275   BOOL    retry_use_local_part;   /* Just what it says */
 276   BOOL    same_domain_copy_routing; /* TRUE => copy routing for same domain */
 277   BOOL    self_rewrite;           /* TRUE to rewrite headers if making local */
 278   BOOL    suffix_optional;        /* As it says */
 279   BOOL    verify_only;            /* Skip this router if not verifying */
 280   BOOL    verify_recipient;       /* Use this router when verifying a recipient*/
 281   BOOL    verify_sender;          /* Use this router when verifying a sender */
 282   BOOL    uid_set;                /* Flag to indicate uid is set */
 283   BOOL    unseen;                 /* If TRUE carry on, even after success */
 284
 285   int     self_code;              /* Encoded version of "self" */
 286   uid_t   uid;                    /* Fixed uid value */
 287   gid_t   gid;                    /* Fixed gid value */
 288
 289   host_item *fallback_hostlist;   /* For remote transport (block chain) */
 290   transport_instance *transport;  /* Transport block (when found) */
 291   struct router_instance *pass_router; /* Actual router for passed address */
 292   struct router_instance *redirect_router; /* Actual router for generated address */
 293 } router_instance;
 294
 295
 296 /* Structure for holding information about a type of router. The first six
 297 fields must match driver_info above. */
 298
 299 typedef struct router_info {
 300   uschar *driver_name;
 301   optionlist *options;            /* Table of private options names */
 302   int    *options_count;          /* -> Number of entries in table */
 303   void   *options_block;          /* Points to default private block */
 304   int     options_len;            /* Length of same in bytes */
 305   void (*init)(                   /* Initialization function */
 306     struct router_instance *);
 307 /****/
 308   int (*code)(                    /* Main entry point */
 309     router_instance *,
 310     struct address_item *,
 311     struct passwd *,
 312     int,
 313     struct address_item **,
 314     struct address_item **,
 315     struct address_item **,
 316     struct address_item **);
 317   void (*tidyup)(                 /* Tidyup function */
 318     struct router_instance *);
 319   int     ri_flags;               /* Descriptive flags */
 320 } router_info;
 321
 322
 323 /* Structure for holding information about a lookup type. */
 324
 325 #include "lookupapi.h"
 326
 327
 328 /* Structure for holding information about the configured authentication
 329 mechanisms */
 330
 331 typedef struct auth_instance {
 332   struct auth_instance *next;
 333   uschar *name;                   /* Exim instance name */
 334   struct auth_info *info;         /* Pointer to driver info block */
 335   void   *options_block;          /* Pointer to private options */
 336   uschar *driver_name;            /* Must be first */
 337   uschar *advertise_condition;    /* Are we going to advertise this?*/
 338   uschar *client_condition;       /* Should the client try this? */
 339   uschar *public_name;            /* Advertised name */
 340   uschar *set_id;                 /* String to set as authenticated id */
 341   uschar *mail_auth_condition;    /* Condition for AUTH on MAIL command */
 342   uschar *server_debug_string;    /* Debugging output */
 343   uschar *server_condition;       /* Authorization condition */
 344   BOOL    client;                 /* TRUE if client option(s) set */
 345   BOOL    server;                 /* TRUE if server options(s) set */
 346   BOOL    advertised;             /* Set TRUE when advertised */
 347 } auth_instance;
 348
 349
 350 /* Structure for holding information about an authentication mechanism. The
 351 first six fields must match driver_info above. */
 352
 353 typedef struct auth_info {
 354   uschar *driver_name;            /* e.g. "condition" */
 355   optionlist *options;            /* Table of private options names */
 356   int    *options_count;          /* -> Number of entries in table */
 357   void   *options_block;          /* Points to default private block */
 358   int     options_len;            /* Length of same in bytes */
 359   void (*init)(                   /* initialization function */
 360     struct auth_instance *);
 361 /****/
 362   int (*servercode)(              /* server function */
 363     auth_instance *,              /* the instance data */
 364     uschar *);                    /* rest of AUTH command */
 365   int (*clientcode)(              /* client function */
 366     struct auth_instance *,
 367     struct smtp_inblock *,        /* socket and input buffer */
 368     struct smtp_outblock *,       /* socket and output buffer */
 369     int,                          /* command timeout */
 370     uschar *,                     /* buffer for reading response */
 371     int);                         /* sizeof buffer */
 372 } auth_info;
 373
 374
 375 /* Structure for holding a single IP address and port; used for the chain of
 376 addresses and ports for the local host. Make the char string large enough to
 377 hold an IPv6 address. */
 378
 379 typedef struct ip_address_item {
 380   struct ip_address_item *next;
 381   int    port;
 382   BOOL   v6_include_v4;            /* Used in the daemon */
 383   uschar address[46];
 384 } ip_address_item;
 385
 386 /* Structure for chaining together arbitrary strings. */
 387
 388 typedef struct string_item {
 389   struct string_item *next;
 390   uschar *text;
 391 } string_item;
 392
 393 /* Information about a soft delivery failure, for use when calculating
 394 retry information. It's separate from the address block, because there
 395 can be a chain of them for SMTP deliveries where multiple IP addresses
 396 can be tried. */
 397
 398 typedef struct retry_item {
 399   struct retry_item *next;        /* for chaining */
 400   uschar *key;                    /* string identifying host/address/message */
 401   int     basic_errno;            /* error code for this destination */
 402   int     more_errno;             /* additional error information */
 403   uschar *message;                /* local error message */
 404   int     flags;                  /* see below */
 405 } retry_item;
 406
 407 /* Retry data flags */
 408
 409 #define rf_delete   0x0001        /* retry info is to be deleted */
 410 #define rf_host     0x0002        /* retry info is for a remote host */
 411 #define rf_message  0x0004        /* retry info is for a host+message */
 412
 413 /* Information about a constructed message that is to be sent using the
 414 autoreply transport. This is pointed to from the address block. */
 415
 416 typedef struct reply_item {
 417   uschar *from;                   /* ) */
 418   uschar *reply_to;               /* ) */
 419   uschar *to;                     /* ) */
 420   uschar *cc;                     /* ) specific header fields */
 421   uschar *bcc;                    /* ) */
 422   uschar *subject;                /* ) */
 423   uschar *headers;                /* misc other headers, concatenated */
 424   uschar *text;                   /* text string body */
 425   uschar *file;                   /* file body */
 426   BOOL    file_expand;            /* expand the body */
 427   int     expand_forbid;          /* expansion lockout flags */
 428   uschar *logfile;                /* file to keep a log in */
 429   uschar *oncelog;                /* file to keep records in for once only */
 430   time_t  once_repeat;            /* time to repeat "once only" */
 431   BOOL    return_message;         /* send back the original message */
 432 } reply_item;
 433
 434
 435 /* The address_item structure contains many fields which are used at various
 436 times while delivering a message. Some are used only for remote deliveries;
 437 some only for local. A particular set of fields is copied whenever a child
 438 address is created. For convenience, we keep those fields in a separate
 439 sub-structure so they can be copied in one go. This also means I won't forget
 440 to edit the various copying places when new to-be-copied fields are added. */
 441
 442 typedef struct address_item_propagated {
 443   uschar *address_data;           /* arbitrary data to keep with the address */
 444   uschar *domain_data;            /* from "domains" lookup */
 445   uschar *localpart_data;         /* from "local_parts" lookup */
 446   uschar *errors_address;         /* where to send errors (NULL => sender) */
 447   header_line *extra_headers;     /* additional headers */
 448   uschar *remove_headers;         /* list of those to remove */
 449
 450   #ifdef EXPERIMENTAL_SRS
 451   uschar *srs_sender;             /* Change return path when delivering */
 452   #endif
 453 } address_item_propagated;
 454
 455 /* Bits for the flags field below */
 456
 457 #define af_allow_file          0x00000001 /* allow file in generated address */
 458 #define af_allow_pipe          0x00000002 /* allow pipe in generated address */
 459 #define af_allow_reply         0x00000004 /* allow autoreply in generated address */
 460 #define af_dr_retry_exists     0x00000008 /* router retry record exists */
 461 #define af_expand_pipe         0x00000010 /* expand pipe arguments */
 462 #define af_file                0x00000020 /* file delivery; always with pfr */
 463 #define af_gid_set             0x00000040 /* gid field is set */
 464 #define af_home_expanded       0x00000080 /* home_dir is already expanded */
 465 #define af_ignore_error        0x00000100 /* ignore delivery error */
 466 #define af_initgroups          0x00000200 /* use initgroups() for local transporting */
 467 #define af_local_host_removed  0x00000400 /* local host was backup */
 468 #define af_lt_retry_exists     0x00000800 /* local transport retry exists */
 469 #define af_pfr                 0x00001000 /* pipe or file or reply delivery */
 470 #define af_retry_skipped       0x00002000 /* true if retry caused some skipping */
 471 #define af_retry_timedout      0x00004000 /* true if retry timed out */
 472 #define af_uid_set             0x00008000 /* uid field is set */
 473 #define af_hide_child          0x00010000 /* hide child in bounce/defer msgs */
 474 #define af_sverify_told        0x00020000 /* sender verify failure notified */
 475 #define af_verify_pmfail       0x00040000 /* verify failure was postmaster callout */
 476 #define af_verify_nsfail       0x00080000 /* verify failure was null sender callout */
 477 #define af_homonym             0x00100000 /* an ancestor has same address */
 478 #define af_verify_routed       0x00200000 /* for cached sender verify: routed OK */
 479 #define af_verify_callout      0x00400000 /* for cached sender verify: callout was specified */
 480 #define af_include_affixes     0x00800000 /* delivered with affixes in RCPT */
 481 #define af_cert_verified       0x01000000 /* delivered with verified TLS cert */
 482 #define af_pass_message        0x02000000 /* pass message in bounces */
 483 #define af_bad_reply           0x04000000 /* filter could not generate autoreply */
 484
 485 /* These flags must be propagated when a child is created */
 486
 487 #define af_propagate           (af_ignore_error)
 488
 489 /* The main address structure. Note that fields that are to be copied to
 490 generated addresses should be put in the address_item_propagated structure (see
 491 above) rather than directly into the address_item structure. */
 492
 493 typedef struct address_item {
 494   struct address_item *next;      /* for chaining addresses */
 495   struct address_item *parent;    /* parent address */
 496   struct address_item *first;     /* points to first after group delivery */
 497   struct address_item *dupof;     /* points to address this is a duplicate of */
 498
 499   router_instance *start_router;  /* generated address starts here */
 500   router_instance *router;        /* the router that routed */
 501   transport_instance *transport;  /* the transport to use */
 502
 503   host_item *host_list;           /* host data for the transport */
 504   host_item *host_used;           /* host that took delivery or failed hard */
 505   host_item *fallback_hosts;      /* to try if delivery defers */
 506
 507   reply_item *reply;              /* data for autoreply */
 508   retry_item *retries;            /* chain of retry information */
 509
 510   uschar *address;                /* address being delivered or routed */
 511   uschar *unique;                 /* used for disambiguating */
 512   uschar *cc_local_part;          /* caseful local part */
 513   uschar *lc_local_part;          /* lowercased local part */
 514   uschar *local_part;             /* points to cc or lc version */
 515   uschar *prefix;                 /* stripped prefix of local part */
 516   uschar *suffix;                 /* stripped suffix of local part */
 517   uschar *domain;                 /* working domain (lower cased) */
 518
 519   uschar *address_retry_key;      /* retry key including full address */
 520   uschar *domain_retry_key;       /* retry key for domain only */
 521
 522   uschar *current_dir;            /* current directory for transporting */
 523   uschar *home_dir;               /* home directory for transporting */
 524   uschar *message;                /* error message */
 525   uschar *user_message;           /* error message that can be sent over SMTP
 526                                      or quoted in bounce message */
 527   uschar *onetime_parent;         /* saved original parent for onetime */
 528   uschar **pipe_expandn;          /* numeric expansions for pipe from filter */
 529   uschar *return_filename;        /* name of return file */
 530   uschar *self_hostname;          /* after self=pass */
 531   uschar *shadow_message;         /* info about shadow transporting */
 532
 533   #ifdef SUPPORT_TLS
 534   uschar *cipher;                 /* Cipher used for transport */
 535   uschar *peerdn;                 /* DN of server's certificate */
 536   #endif
 537
 538   uid_t   uid;                    /* uid for transporting */
 539   gid_t   gid;                    /* gid for transporting */
 540
 541   unsigned int flags;             /* a row of bits, defined above */
 542   unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32];
 543   unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32];
 544   int     mode;                   /* mode for local transporting to a file */
 545   int     more_errno;             /* additional error information */
 546                                   /* (may need to hold a timestamp) */
 547
 548   short int basic_errno;          /* status after failure */
 549   short int child_count;          /* number of child addresses */
 550   short int return_file;          /* fileno of return data file */
 551   short int special_action;       /* ( used when when deferred or failed */
 552                                   /* (  also  */
 553                                   /* ( contains = or - when successful SMTP delivered */
 554                                   /* (  also  */
 555                                   /* ( contains verify rc in sender verify cache */
 556   short int transport_return;     /* result of delivery attempt */
 557   address_item_propagated p;      /* fields that are propagated to children */
 558 } address_item;
 559
 560 /* The table of header names consists of items of this type */
 561
 562 typedef struct {
 563   uschar *name;
 564   int     len;
 565   BOOL    allow_resent;
 566   int     htype;
 567 } header_name;
 568
 569 /* Chain of information about errors (e.g. bad addresses) */
 570
 571 typedef struct error_block {
 572   struct error_block *next;
 573   uschar *text1;
 574   uschar *text2;
 575 } error_block;
 576
 577 /* Chain of file names when processing the queue */
 578
 579 typedef struct queue_filename {
 580   struct queue_filename *next;
 581   uschar dir_uschar;
 582   uschar text[1];
 583 } queue_filename;
 584
 585 /* Chain of items of retry information, read from the retry config. */
 586
 587 typedef struct retry_rule {
 588   struct retry_rule *next;
 589   int    rule;
 590   int    timeout;
 591   int    p1;
 592   int    p2;
 593 } retry_rule;
 594
 595 typedef struct retry_config {
 596   struct retry_config *next;
 597   uschar *pattern;
 598   int     basic_errno;
 599   int     more_errno;
 600   uschar *senders;
 601   retry_rule *rules;
 602 } retry_config;
 603
 604 /* Structure for each node in a tree, of which there are various kinds */
 605
 606 typedef struct tree_node {
 607   struct tree_node *left;         /* pointer to left child */
 608   struct tree_node *right;        /* pointer to right child */
 609   union
 610     {
 611     void  *ptr;                   /* pointer to data */
 612     int val;                      /* or integer data */
 613     } data;
 614   uschar  balance;                /* balancing factor */
 615   uschar  name[1];                /* node name - variable length */
 616 } tree_node;
 617
 618 /* Structure for holding the handle and the cached last lookup for searches.
 619 This block is pointed to by the tree entry for the file. The file can get
 620 closed if too many are opened at once. There is a LRU chain for deciding which
 621 to close. */
 622
 623 typedef struct search_cache {
 624   void   *handle;                 /* lookup handle, or NULL if closed */
 625   int search_type;                /* search type */
 626   tree_node *up;                  /* LRU up pointer */
 627   tree_node *down;                /* LRU down pointer */
 628   tree_node *item_cache;          /* tree of cached results */
 629 } search_cache;
 630
 631 /* Structure for holding a partially decoded DNS record; the name has been
 632 uncompressed, but the data pointer is into the raw data. */
 633
 634 typedef struct {
 635   uschar  name[DNS_MAXNAME];      /* domain name */
 636   int     type;                   /* record type */
 637   int     size;                   /* size of data */
 638   uschar *data;                   /* pointer to data */
 639 } dns_record;
 640
 641 /* Structure for holding the result of a DNS query. */
 642
 643 typedef struct {
 644   int     answerlen;              /* length of the answer */
 645   uschar  answer[MAXPACKET];      /* the answer itself */
 646 } dns_answer;
 647
 648 /* Structure for holding the intermediate data while scanning a DNS answer
 649 block. */
 650
 651 typedef struct {
 652   int     rrcount;                /* count of RRs in the answer */
 653   uschar *aptr;                   /* pointer in the answer while scanning */
 654   dns_record srr;                 /* data from current record in scan */
 655 } dns_scan;
 656
 657 /* Structure for holding a chain of IP addresses that are extracted from
 658 an A, AAAA, or A6 record. For the first two, there is only ever one address,
 659 but the chaining feature of A6 allows for several addresses to be realized from
 660 a single initial A6 record. The structure defines the address field of length
 661 1. In use, a suitable sized block is obtained to hold the complete textual
 662 address. */
 663
 664 typedef struct dns_address {
 665   struct dns_address *next;
 666   uschar  address[1];
 667 } dns_address;
 668
 669 /* Structure used for holding intermediate data during MD5 computations. */
 670
 671 typedef struct md5 {
 672   unsigned int length;
 673   unsigned int abcd[4];
 674   }
 675 md5;
 676
 677 /* Structure used for holding intermediate data during SHA-1 computations. */
 678
 679 typedef struct sha1 {
 680   unsigned int H[5];
 681   unsigned int length;
 682   }
 683 sha1;
 684
 685 /* Structure used to hold incoming packets of SMTP responses for a specific
 686 socket. The packets which may contain multiple lines (and in some cases,
 687 multiple responses). */
 688
 689 typedef struct smtp_inblock {
 690   int     sock;                   /* the socket */
 691   int     buffersize;             /* the size of the buffer */
 692   uschar *ptr;                    /* current position in the buffer */
 693   uschar *ptrend;                 /* end of data in the buffer */
 694   uschar *buffer;                 /* the buffer itself */
 695 } smtp_inblock;
 696
 697 /* Structure used to hold buffered outgoing packets of SMTP commands for a
 698 specific socket. The packets which may contain multiple lines when pipelining
 699 is in use. */
 700
 701 typedef struct smtp_outblock {
 702   int     sock;                   /* the socket */
 703   int     cmd_count;              /* count of buffered commands */
 704   int     buffersize;             /* the size of the buffer */
 705   BOOL    authenticating;         /* TRUE when authenticating */
 706   uschar *ptr;                    /* current position in the buffer */
 707   uschar *buffer;                 /* the buffer itself */
 708 } smtp_outblock;
 709
 710 /* Structure to hold information about the source of redirection information */
 711
 712 typedef struct redirect_block {
 713   uschar *string;                 /* file name or string */
 714   uid_t  *owners;                 /* allowed file owners */
 715   gid_t  *owngroups;              /* allowed file groups */
 716   struct passwd *pw;              /* possible owner if not NULL */
 717   int     modemask;               /* forbidden bits */
 718   BOOL    isfile;                 /* TRUE if string is a file name */
 719   BOOL    check_owner;            /* TRUE, FALSE, or TRUE_UNSET */
 720   BOOL    check_group;            /* TRUE, FALSE, or TRUE_UNSET */
 721 } redirect_block;
 722
 723 /* Structure for passing arguments to check_host() */
 724
 725 typedef struct check_host_block {
 726   uschar *host_name;
 727   uschar *host_address;
 728   uschar *host_ipv4;
 729   BOOL   negative;
 730 } check_host_block;
 731
 732 /* Structure for remembering lookup data when caching the result of
 733 a lookup in a named list. */
 734
 735 typedef struct namedlist_cacheblock {
 736   struct namedlist_cacheblock *next;
 737   uschar *key;
 738   uschar *data;
 739 } namedlist_cacheblock;
 740
 741 /* Structure for holding data for an entry in a named list */
 742
 743 typedef struct namedlist_block {
 744   uschar *string;                    /* the list string */
 745   namedlist_cacheblock *cache_data;  /* cached domain_data or localpart_data */
 746   int number;                        /* the number of the list for caching */
 747 } namedlist_block;
 748
 749 /* Structures for Access Control Lists */
 750
 751 typedef struct acl_condition_block {
 752   struct acl_condition_block *next;
 753   uschar *arg;
 754   int type;
 755   union {
 756     BOOL negated;
 757     uschar *varname;
 758   } u;
 759 } acl_condition_block;
 760
 761 typedef struct acl_block {
 762   struct acl_block *next;
 763   acl_condition_block *condition;
 764   int verb;
 765 } acl_block;
 766
 767 /* End of structs.h */