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| -rw-r--r-- | src/structs.h | 917 |
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diff --git a/src/structs.h b/src/structs.h new file mode 100644 index 0000000..20db0e5 --- /dev/null +++ b/src/structs.h @@ -0,0 +1,917 @@ +/************************************************* +* Exim - an Internet mail transport agent * +*************************************************/ + +/* Copyright (c) University of Cambridge 1995 - 2018 */ +/* See the file NOTICE for conditions of use and distribution. */ + + +/* Definitions of various structures. In addition, those that are visible for +the compilation of local_scan() are defined in local_scan.h. These are + + header_line + optionlist + recipient_item + +For those declared here, we have to pre-declare some because of mutually +recursive definitions in the auths, routers, and transports blocks. */ + +struct address_item; +struct auth_info; +struct driver_info; +struct director_info; +struct smtp_inblock; +struct smtp_outblock; +struct transport_info; +struct router_info; + +/* Growable-string */ +typedef struct gstring { + int size; /* Current capacity of string memory */ + int ptr; /* Offset at which to append further chars */ + uschar * s; /* The string memory */ +} gstring; + +/* Structure for remembering macros for the configuration file */ + +typedef struct macro_item { + struct macro_item * next; + BOOL command_line; + unsigned namelen; + unsigned replen; + const uschar * name; + const uschar * replacement; +} macro_item; + +/* Structure for bit tables for debugging and logging */ + +typedef struct bit_table { + uschar *name; + int bit; +} bit_table; + +/* Block for holding a uid and gid, possibly unset, and an initgroups flag. */ + +typedef struct ugid_block { + uid_t uid; + gid_t gid; + BOOL uid_set; + BOOL gid_set; + BOOL initgroups; +} ugid_block; + +typedef enum { CHUNKING_NOT_OFFERED = -1, + CHUNKING_OFFERED, + CHUNKING_ACTIVE, + CHUNKING_LAST} chunking_state_t; + +typedef enum { TFO_NOT_USED = 0, + TFO_ATTEMPTED_NODATA, + TFO_ATTEMPTED_DATA, + TFO_USED_NODATA, + TFO_USED_DATA } tfo_state_t; + +/* Structure for holding information about a host for use mainly by routers, +but also used when checking lists of hosts and when transporting. Looking up +host addresses is done using this structure. */ + +typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t; + +typedef struct host_item { + struct host_item *next; + const uschar *name; /* Host name */ + const uschar *address; /* IP address in text form */ + int port; /* port value in host order (if SRV lookup) */ + int mx; /* MX value if found via MX records */ + int sort_key; /* MX*1000 plus random "fraction" */ + int status; /* Usable, unusable, or unknown */ + int why; /* Why host is unusable */ + int last_try; /* Time of last try if known */ + dnssec_status_t dnssec; +} host_item; + +/* Chain of rewrite rules, read from the rewrite config, or parsed from the +rewrite_headers field of a transport. */ + +typedef struct rewrite_rule { + struct rewrite_rule *next; + int flags; + uschar *key; + uschar *replacement; +} rewrite_rule; + +/* This structure is used to pass back configuration data from the smtp +transport to the outside world. It is used during callback processing. If ever +another remote transport were implemented, it could use the same structure. */ + +typedef struct transport_feedback { + uschar *interface; + uschar *port; + uschar *protocol; + uschar *hosts; + uschar *helo_data; + BOOL hosts_override; + BOOL hosts_randomize; + BOOL gethostbyname; + BOOL qualify_single; + BOOL search_parents; +} transport_feedback; + +/* Routers, transports, and authenticators have similar data blocks. Each +driver that is compiled into the code is represented by a xxx_info block; the +active drivers are represented by a chain of xxx_instance blocks. To make it +possible to use the same code for reading the configuration files for all +three, the layout of the start of the blocks is kept the same, and represented +by the generic structures driver_info and driver_instance. */ + +typedef struct driver_instance { + struct driver_instance *next; + uschar *name; /* Instance name */ + struct driver_info *info; /* Points to info for this driver */ + void *options_block; /* Pointer to private options */ + uschar *driver_name; /* All start with this generic option */ +} driver_instance; + +typedef struct driver_info { + uschar *driver_name; /* Name of driver */ + optionlist *options; /* Table of private options names */ + int *options_count; /* -> Number of entries in table */ + void *options_block; /* Points to default private block */ + int options_len; /* Length of same in bytes */ + void (*init)( /* Initialization entry point */ + struct driver_instance *); +} driver_info; + + +/* Structure for holding information about the configured transports. Some +of the generally accessible options are set from the configuration file; others +are set by transport initialization, since they can only be set for certain +transports. They need to be generally accessible, however, as they are used by +the main transport code. */ + +typedef struct transport_instance { + struct transport_instance *next; + uschar *name; /* Instance name */ + struct transport_info *info; /* Info for this driver */ + void *options_block; /* Pointer to private options */ + uschar *driver_name; /* Must be first */ + int (*setup)( /* Setup entry point */ + struct transport_instance *, + struct address_item *, + struct transport_feedback *, /* For passing back config data */ + uid_t, /* The uid that will be used */ + gid_t, /* The gid that will be used */ + uschar **); /* For an error message */ + /**************************************/ + int batch_max; /* ) */ + uschar *batch_id; /* ) */ + uschar *home_dir; /* ) Used only for local transports */ + uschar *current_dir; /* ) */ + /**************************************/ + uschar *expand_multi_domain; /* ) */ + BOOL multi_domain; /* ) */ + BOOL overrides_hosts; /* ) Used only for remote transports */ + int max_addresses; /* ) */ + int connection_max_messages;/* ) */ + /**************************************/ + BOOL deliver_as_creator; /* Used only by pipe at present */ + BOOL disable_logging; /* For very weird requirements */ + BOOL initgroups; /* Initialize groups when setting uid */ + BOOL uid_set; /* uid is set */ + BOOL gid_set; /* gid is set */ + uid_t uid; + gid_t gid; + uschar *expand_uid; /* Variable uid */ + uschar *expand_gid; /* Variable gid */ + uschar *warn_message; /* Used only by appendfile at present */ + uschar *shadow; /* Name of shadow transport */ + uschar *shadow_condition; /* Condition for running it */ + uschar *filter_command; /* For on-the-fly-filtering */ + uschar *add_headers; /* Add these headers */ + uschar *remove_headers; /* Remove these headers */ + uschar *return_path; /* Overriding (rewriting) return path */ + uschar *debug_string; /* Debugging output */ + uschar *max_parallel; /* Number of concurrent instances */ + uschar *message_size_limit; /* Biggest message this transport handles */ + uschar *headers_rewrite; /* Rules for rewriting headers */ + rewrite_rule *rewrite_rules; /* Parsed rewriting rules */ + int rewrite_existflags; /* Bits showing which headers are rewritten */ + int filter_timeout; /* For transport filter timing */ + BOOL body_only; /* Deliver only the body */ + BOOL delivery_date_add; /* Add Delivery-Date header */ + BOOL envelope_to_add; /* Add Envelope-To header */ + BOOL headers_only; /* Deliver only the headers */ + BOOL rcpt_include_affixes; /* TRUE to retain affixes in RCPT commands */ + BOOL return_path_add; /* Add Return-Path header */ + BOOL return_output; /* TRUE if output should always be returned */ + BOOL return_fail_output; /* ditto, but only on failure */ + BOOL log_output; /* Similarly for logging */ + BOOL log_fail_output; + BOOL log_defer_output; + BOOL retry_use_local_part; /* Defaults true for local, false for remote */ +#ifndef DISABLE_EVENT + uschar *event_action; /* String to expand on notable events */ +#endif +} transport_instance; + + +/* Structure for holding information about a type of transport. The first six +fields must match driver_info above. */ + +typedef struct transport_info { + uschar *driver_name; /* Driver name */ + optionlist *options; /* Table of private options names */ + int *options_count; /* -> Number of entries in table */ + void *options_block; /* Points to default private block */ + int options_len; /* Length of same in bytes */ + void (*init)( /* Initialization function */ + struct transport_instance *); +/****/ + BOOL (*code)( /* Main entry point */ + transport_instance *, + struct address_item *); + void (*tidyup)( /* Tidyup function */ + struct transport_instance *); + void (*closedown)( /* For closing down a passed channel */ + struct transport_instance *); + BOOL local; /* TRUE for local transports */ +} transport_info; + + +/* smtp transport datachunk callback */ + +#define tc_reap_prev BIT(0) /* Flags: reap previous SMTP cmd responses */ +#define tc_chunk_last BIT(1) /* annotate chunk SMTP cmd as LAST */ + +struct transport_context; +typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned); + +/* Structure for information about a delivery-in-progress */ + +typedef struct transport_context { + union { /* discriminated by option topt_output_string */ + int fd; /* file descriptor to write message to */ + gstring * msg; /* allocated string with written message */ + } u; + transport_instance * tblock; /* transport */ + struct address_item * addr; + uschar * check_string; /* string replacement */ + uschar * escape_string; + int options; /* output processing topt_* */ + + /* items below only used with option topt_use_bdat */ + tpt_chunk_cmd_cb chunk_cb; /* per-datachunk callback */ + void * smtp_context; +} transport_ctx; + + + +typedef struct { + uschar *request; + uschar *require; +} dnssec_domains; + +/* Structure for holding information about the configured routers. */ + +typedef struct router_instance { + struct router_instance *next; + uschar *name; + struct router_info *info; + void *options_block; /* Pointer to private options */ + uschar *driver_name; /* Must be first */ + + uschar *address_data; /* Arbitrary data */ +#ifdef EXPERIMENTAL_BRIGHTMAIL + uschar *bmi_rule; /* Brightmail AntiSpam rule checking */ +#endif + uschar *cannot_route_message; /* Used when routing fails */ + uschar *condition; /* General condition */ + uschar *current_directory; /* For use during delivery */ + uschar *debug_string; /* Debugging output */ + uschar *domains; /* Specific domains */ + uschar *errors_to; /* Errors address */ + uschar *expand_gid; /* Expanded gid string */ + uschar *expand_uid; /* Expanded uid string */ + uschar *expand_more; /* Expanded more string */ + uschar *expand_unseen; /* Expanded unseen string */ + uschar *extra_headers; /* Additional headers */ + uschar *fallback_hosts; /* For remote transports (text list) */ + uschar *home_directory; /* For use during delivery */ + uschar *ignore_target_hosts; /* Target hosts to ignore */ + uschar *local_parts; /* Specific local parts */ + uschar *pass_router_name; /* Router for passed address */ + uschar *prefix; /* Address prefix */ + uschar *redirect_router_name; /* Router for generated address */ + uschar *remove_headers; /* Removed headers */ + uschar *require_files; /* File checks before router is run */ + uschar *router_home_directory; /* For use while routing */ + uschar *self; /* Text option for handling self reference */ + uschar *senders; /* Specific senders */ + uschar *suffix; /* Address suffix */ + uschar *translate_ip_address; /* IP address translation fudgery */ + uschar *transport_name; /* Transport name */ + + BOOL address_test; /* Use this router when testing addresses */ +#ifdef EXPERIMENTAL_BRIGHTMAIL + BOOL bmi_deliver_alternate; /* TRUE => BMI said that message should be delivered to alternate location */ + BOOL bmi_deliver_default; /* TRUE => BMI said that message should be delivered to default location */ + BOOL bmi_dont_deliver; /* TRUE => BMI said that message should not be delivered at all */ +#endif + BOOL expn; /* Use this router when processing EXPN */ + BOOL caseful_local_part; /* TRUE => don't lowercase */ + BOOL check_local_user; /* TRUE => check local user */ + BOOL disable_logging; /* For very weird requirements */ + BOOL fail_verify_recipient; /* Fail verify if recipient match this router */ + BOOL fail_verify_sender; /* Fail verify if sender match this router */ + BOOL gid_set; /* Flag to indicate gid is set */ + BOOL initgroups; /* TRUE if initgroups is required */ + BOOL log_as_local; /* TRUE logs as a local delivery */ + BOOL more; /* If FALSE, do no more if this one fails */ + BOOL pass_on_timeout; /* Treat timeout DEFERs as fails */ + BOOL prefix_optional; /* Just what it says */ + BOOL repeat_use; /* If FALSE, skip if ancestor used it */ + BOOL retry_use_local_part; /* Just what it says */ + BOOL same_domain_copy_routing; /* TRUE => copy routing for same domain */ + BOOL self_rewrite; /* TRUE to rewrite headers if making local */ + BOOL suffix_optional; /* As it says */ + BOOL verify_only; /* Skip this router if not verifying */ + BOOL verify_recipient; /* Use this router when verifying a recipient*/ + BOOL verify_sender; /* Use this router when verifying a sender */ + BOOL uid_set; /* Flag to indicate uid is set */ + BOOL unseen; /* If TRUE carry on, even after success */ + BOOL dsn_lasthop; /* If TRUE, this router is a DSN endpoint */ + + int self_code; /* Encoded version of "self" */ + uid_t uid; /* Fixed uid value */ + gid_t gid; /* Fixed gid value */ + + host_item *fallback_hostlist; /* For remote transport (block chain) */ + transport_instance *transport; /* Transport block (when found) */ + struct router_instance *pass_router; /* Actual router for passed address */ + struct router_instance *redirect_router; /* Actual router for generated address */ + + dnssec_domains dnssec; +} router_instance; + + +/* Structure for holding information about a type of router. The first six +fields must match driver_info above. */ + +typedef struct router_info { + uschar *driver_name; + optionlist *options; /* Table of private options names */ + int *options_count; /* -> Number of entries in table */ + void *options_block; /* Points to default private block */ + int options_len; /* Length of same in bytes */ + void (*init)( /* Initialization function */ + struct router_instance *); +/****/ + int (*code)( /* Main entry point */ + router_instance *, + struct address_item *, + struct passwd *, + int, + struct address_item **, + struct address_item **, + struct address_item **, + struct address_item **); + void (*tidyup)( /* Tidyup function */ + struct router_instance *); + int ri_flags; /* Descriptive flags */ +} router_info; + + +/* Structure for holding information about a lookup type. */ + +#include "lookupapi.h" + + +/* Structure for holding information about the configured authentication +mechanisms */ + +typedef struct auth_instance { + struct auth_instance *next; + uschar *name; /* Exim instance name */ + struct auth_info *info; /* Pointer to driver info block */ + void *options_block; /* Pointer to private options */ + uschar *driver_name; /* Must be first */ + uschar *advertise_condition; /* Are we going to advertise this?*/ + uschar *client_condition; /* Should the client try this? */ + uschar *public_name; /* Advertised name */ + uschar *set_id; /* String to set when server as authenticated id */ + uschar *set_client_id; /* String to set when client as client_authenticated id */ + uschar *mail_auth_condition; /* Condition for AUTH on MAIL command */ + uschar *server_debug_string; /* Debugging output */ + uschar *server_condition; /* Authorization condition */ + BOOL client; /* TRUE if client option(s) set */ + BOOL server; /* TRUE if server options(s) set */ + BOOL advertised; /* Set TRUE when advertised */ +} auth_instance; + + +/* Structure for holding information about an authentication mechanism. The +first six fields must match driver_info above. */ + +typedef struct auth_info { + uschar *driver_name; /* e.g. "condition" */ + optionlist *options; /* Table of private options names */ + int *options_count; /* -> Number of entries in table */ + void *options_block; /* Points to default private block */ + int options_len; /* Length of same in bytes */ + void (*init)( /* initialization function */ + struct auth_instance *); +/****/ + int (*servercode)( /* server function */ + auth_instance *, /* the instance data */ + uschar *); /* rest of AUTH command */ + int (*clientcode)( /* client function */ + struct auth_instance *, + void *, /* smtp conn, with socket, output and input buffers */ + int, /* command timeout */ + uschar *, /* buffer for reading response */ + int); /* sizeof buffer */ + void (*version_report)( /* diagnostic version reporting */ + FILE *); /* I/O stream to print to */ +} auth_info; + + +/* Structure for holding a single IP address and port; used for the chain of +addresses and ports for the local host. Make the char string large enough to +hold an IPv6 address. */ + +typedef struct ip_address_item { + struct ip_address_item *next; + int port; + BOOL v6_include_v4; /* Used in the daemon */ + uschar address[46]; +} ip_address_item; + +/* Structure for chaining together arbitrary strings. */ + +typedef struct string_item { + struct string_item *next; + uschar *text; +} string_item; + +/* Information about a soft delivery failure, for use when calculating +retry information. It's separate from the address block, because there +can be a chain of them for SMTP deliveries where multiple IP addresses +can be tried. */ + +typedef struct retry_item { + struct retry_item *next; /* for chaining */ + uschar *key; /* string identifying host/address/message */ + int basic_errno; /* error code for this destination */ + int more_errno; /* additional error information */ + uschar *message; /* local error message */ + int flags; /* see below */ +} retry_item; + +/* Retry data flags */ + +#define rf_delete 0x0001 /* retry info is to be deleted */ +#define rf_host 0x0002 /* retry info is for a remote host */ +#define rf_message 0x0004 /* retry info is for a host+message */ + +/* Information about a constructed message that is to be sent using the +autoreply transport. This is pointed to from the address block. */ + +typedef struct reply_item { + uschar *from; /* ) */ + uschar *reply_to; /* ) */ + uschar *to; /* ) */ + uschar *cc; /* ) specific header fields */ + uschar *bcc; /* ) */ + uschar *subject; /* ) */ + uschar *headers; /* misc other headers, concatenated */ + uschar *text; /* text string body */ + uschar *file; /* file body */ + BOOL file_expand; /* expand the body */ + int expand_forbid; /* expansion lockout flags */ + uschar *logfile; /* file to keep a log in */ + uschar *oncelog; /* file to keep records in for once only */ + time_t once_repeat; /* time to repeat "once only" */ + BOOL return_message; /* send back the original message */ +} reply_item; + + +/* The address_item structure contains many fields which are used at various +times while delivering a message. Some are used only for remote deliveries; +some only for local. A particular set of fields is copied whenever a child +address is created. For convenience, we keep those fields in a separate +sub-structure so they can be copied in one go. This also means I won't forget +to edit the various copying places when new to-be-copied fields are added. */ + +typedef struct address_item_propagated { + uschar *address_data; /* arbitrary data to keep with the address */ + uschar *domain_data; /* from "domains" lookup */ + uschar *localpart_data; /* from "local_parts" lookup */ + uschar *errors_address; /* where to send errors (NULL => sender) */ + header_line *extra_headers; /* additional headers */ + uschar *remove_headers; /* list of those to remove */ + + #ifdef EXPERIMENTAL_SRS + uschar *srs_sender; /* Change return path when delivering */ + #endif + BOOL ignore_error:1; /* ignore delivery error */ + #ifdef SUPPORT_I18N + BOOL utf8_msg:1; /* requires SMTPUTF8 processing */ + BOOL utf8_downcvt:1; /* mandatory downconvert on delivery */ + BOOL utf8_downcvt_maybe:1; /* optional downconvert on delivery */ + #endif +} address_item_propagated; + + +/* The main address structure. Note that fields that are to be copied to +generated addresses should be put in the address_item_propagated structure (see +above) rather than directly into the address_item structure. */ + +typedef struct address_item { + struct address_item *next; /* for chaining addresses */ + struct address_item *parent; /* parent address */ + struct address_item *first; /* points to first after group delivery */ + struct address_item *dupof; /* points to address this is a duplicate of */ + + router_instance *start_router; /* generated address starts here */ + router_instance *router; /* the router that routed */ + transport_instance *transport; /* the transport to use */ + + host_item *host_list; /* host data for the transport */ + host_item *host_used; /* host that took delivery or failed hard */ + host_item *fallback_hosts; /* to try if delivery defers */ + + reply_item *reply; /* data for autoreply */ + retry_item *retries; /* chain of retry information */ + + uschar *address; /* address being delivered or routed */ + uschar *unique; /* used for disambiguating */ + uschar *cc_local_part; /* caseful local part */ + uschar *lc_local_part; /* lowercased local part */ + uschar *local_part; /* points to cc or lc version */ + uschar *prefix; /* stripped prefix of local part */ + uschar *suffix; /* stripped suffix of local part */ + const uschar *domain; /* working domain (lower cased) */ + + uschar *address_retry_key; /* retry key including full address */ + uschar *domain_retry_key; /* retry key for domain only */ + + uschar *current_dir; /* current directory for transporting */ + uschar *home_dir; /* home directory for transporting */ + uschar *message; /* error message */ + uschar *user_message; /* error message that can be sent over SMTP + or quoted in bounce message */ + uschar *onetime_parent; /* saved original parent for onetime */ + uschar **pipe_expandn; /* numeric expansions for pipe from filter */ + uschar *return_filename; /* name of return file */ + uschar *self_hostname; /* after self=pass */ + uschar *shadow_message; /* info about shadow transporting */ + +#ifdef SUPPORT_TLS + uschar *cipher; /* Cipher used for transport */ + void *ourcert; /* Certificate offered to peer, binary */ + void *peercert; /* Certificate from peer, binary */ + uschar *peerdn; /* DN of server's certificate */ + int ocsp; /* OCSP status of peer cert */ +#endif + +#ifdef EXPERIMENTAL_DSN_INFO + const uschar *smtp_greeting; /* peer self-identification */ + const uschar *helo_response; /* peer message */ +#endif + + uschar *authenticator; /* auth driver name used by transport */ + uschar *auth_id; /* auth "login" name used by transport */ + uschar *auth_sndr; /* AUTH arg to SMTP MAIL, used by transport */ + + uschar *dsn_orcpt; /* DSN orcpt value */ + int dsn_flags; /* DSN flags */ + int dsn_aware; /* DSN aware flag */ + + uid_t uid; /* uid for transporting */ + gid_t gid; /* gid for transporting */ + + /* flags */ + struct { + BOOL af_allow_file:1; /* allow file in generated address */ + BOOL af_allow_pipe:1; /* allow pipe in generated address */ + BOOL af_allow_reply:1; /* allow autoreply in generated address */ + BOOL af_dr_retry_exists:1; /* router retry record exists */ + BOOL af_expand_pipe:1; /* expand pipe arguments */ + BOOL af_file:1; /* file delivery; always with pfr */ + BOOL af_gid_set:1; /* gid field is set */ + BOOL af_home_expanded:1; /* home_dir is already expanded */ + BOOL af_initgroups:1; /* use initgroups() for local transporting */ + BOOL af_local_host_removed:1; /* local host was backup */ + BOOL af_lt_retry_exists:1; /* local transport retry exists */ + BOOL af_pfr:1; /* pipe or file or reply delivery */ + BOOL af_retry_skipped:1; /* true if retry caused some skipping */ + BOOL af_retry_timedout:1; /* true if retry timed out */ + BOOL af_uid_set:1; /* uid field is set */ + BOOL af_hide_child:1; /* hide child in bounce/defer msgs */ + BOOL af_sverify_told:1; /* sender verify failure notified */ + BOOL af_verify_pmfail:1; /* verify failure was postmaster callout */ + BOOL af_verify_nsfail:1; /* verify failure was null sender callout */ + BOOL af_homonym:1; /* an ancestor has same address */ + BOOL af_verify_routed:1; /* for cached sender verify: routed OK */ + BOOL af_verify_callout:1; /* for cached sender verify: callout was specified */ + BOOL af_include_affixes:1; /* delivered with affixes in RCPT */ + BOOL af_cert_verified:1; /* delivered with verified TLS cert */ + BOOL af_pass_message:1; /* pass message in bounces */ + BOOL af_bad_reply:1; /* filter could not generate autoreply */ + BOOL af_tcp_fastopen_conn:1; /* delivery connection used TCP Fast Open */ + BOOL af_tcp_fastopen:1; /* delivery usefully used TCP Fast Open */ + BOOL af_tcp_fastopen_data:1; /* delivery sent SMTP commands on TCP Fast Open */ + BOOL af_pipelining:1; /* delivery used (traditional) pipelining */ +#ifdef EXPERIMENTAL_PIPE_CONNECT + BOOL af_early_pipe:1; /* delivery used connect-time pipelining */ +#endif +#ifndef DISABLE_PRDR + BOOL af_prdr_used:1; /* delivery used SMTP PRDR */ +#endif + BOOL af_chunking_used:1; /* delivery used SMTP CHUNKING */ + BOOL af_force_command:1; /* force_command in pipe transport */ +#ifdef SUPPORT_DANE + BOOL af_dane_verified:1; /* TLS cert verify done with DANE */ +#endif +#ifdef SUPPORT_I18N + BOOL af_utf8_downcvt:1; /* downconvert was done for delivery */ +#endif + } flags; + + unsigned int domain_cache[(MAX_NAMED_LIST * 2)/32]; + unsigned int localpart_cache[(MAX_NAMED_LIST * 2)/32]; + int mode; /* mode for local transporting to a file */ + int more_errno; /* additional error information */ + /* (may need to hold a timestamp) */ + unsigned int delivery_usec; /* subsecond part of delivery time */ + + short int basic_errno; /* status after failure */ + unsigned short child_count; /* number of child addresses */ + short int return_file; /* fileno of return data file */ + short int special_action; /* ( used when when deferred or failed */ + /* ( also */ + /* ( contains = or - when successful SMTP delivered */ + /* ( also */ + /* ( contains verify rc in sender verify cache */ + short int transport_return; /* result of delivery attempt */ + address_item_propagated prop; /* fields that are propagated to children */ +} address_item; + +/* The table of header names consists of items of this type */ + +typedef struct { + uschar *name; + int len; + BOOL allow_resent; + int htype; +} header_name; + +/* Chain of information about errors (e.g. bad addresses) */ + +typedef struct error_block { + struct error_block *next; + const uschar *text1; + uschar *text2; +} error_block; + +/* Chain of file names when processing the queue */ + +typedef struct queue_filename { + struct queue_filename *next; + uschar dir_uschar; + uschar text[1]; +} queue_filename; + +/* Chain of items of retry information, read from the retry config. */ + +typedef struct retry_rule { + struct retry_rule *next; + int rule; + int timeout; + int p1; + int p2; +} retry_rule; + +typedef struct retry_config { + struct retry_config *next; + uschar *pattern; + int basic_errno; + int more_errno; + uschar *senders; + retry_rule *rules; +} retry_config; + +/* Structure for each node in a tree, of which there are various kinds */ + +typedef struct tree_node { + struct tree_node *left; /* pointer to left child */ + struct tree_node *right; /* pointer to right child */ + union + { + void *ptr; /* pointer to data */ + int val; /* or integer data */ + } data; + uschar balance; /* balancing factor */ + uschar name[1]; /* node name - variable length */ +} tree_node; + +/* Structure for holding time-limited data such as DNS returns. +We use this rather than extending tree_node to avoid wasting +space for most tree use (variables...) at the cost of complexity +for the lookups cache */ + +typedef struct expiring_data { + time_t expiry; /* if nonzero, data invalid after this time */ + void *ptr; /* pointer to data */ +} expiring_data; + +/* Structure for holding the handle and the cached last lookup for searches. +This block is pointed to by the tree entry for the file. The file can get +closed if too many are opened at once. There is a LRU chain for deciding which +to close. */ + +typedef struct search_cache { + void *handle; /* lookup handle, or NULL if closed */ + int search_type; /* search type */ + tree_node *up; /* LRU up pointer */ + tree_node *down; /* LRU down pointer */ + tree_node *item_cache; /* tree of cached results */ +} search_cache; + +/* Structure for holding a partially decoded DNS record; the name has been +uncompressed, but the data pointer is into the raw data. */ + +typedef struct { + uschar name[DNS_MAXNAME]; /* domain name */ + int type; /* record type */ + unsigned short ttl; /* time-to-live, seconds */ + int size; /* size of data */ + const uschar *data; /* pointer to data */ +} dns_record; + +/* Structure for holding the result of a DNS query. A touch over +64k big, so take care to release as soon as possible. */ + +typedef struct { + int answerlen; /* length of the answer */ + uschar answer[NS_MAXMSG]; /* the answer itself */ +} dns_answer; + +/* Structure for holding the intermediate data while scanning a DNS answer +block. */ + +typedef struct { + int rrcount; /* count of RRs in the answer */ + const uschar *aptr; /* pointer in the answer while scanning */ + dns_record srr; /* data from current record in scan */ +} dns_scan; + +/* Structure for holding a chain of IP addresses that are extracted from +an A, AAAA, or A6 record. For the first two, there is only ever one address, +but the chaining feature of A6 allows for several addresses to be realized from +a single initial A6 record. The structure defines the address field of length +1. In use, a suitable sized block is obtained to hold the complete textual +address. */ + +typedef struct dns_address { + struct dns_address *next; + uschar address[1]; +} dns_address; + +/* Structure used for holding intermediate data during MD5 computations. */ + +typedef struct md5 { + unsigned int length; + unsigned int abcd[4]; + } +md5; + +/* Structure used for holding intermediate data during SHA-1 computations. */ + +typedef struct sha1 { + unsigned int H[5]; + unsigned int length; +} sha1; + +/* Information for making an smtp connection */ +typedef struct { + transport_instance * tblock; + void * ob; /* smtp_transport_options_block * */ + host_item * host; + int host_af; + uschar * interface; +} smtp_connect_args; + +/* A client-initiated connection. If TLS, the second element is non-NULL */ +typedef struct { + int sock; + void * tls_ctx; +} client_conn_ctx; + + +/* Structure used to hold incoming packets of SMTP responses for a specific +socket. The packets which may contain multiple lines (and in some cases, +multiple responses). */ + +typedef struct smtp_inblock { + client_conn_ctx * cctx; /* the connection */ + int buffersize; /* the size of the buffer */ + uschar *ptr; /* current position in the buffer */ + uschar *ptrend; /* end of data in the buffer */ + uschar *buffer; /* the buffer itself */ +} smtp_inblock; + +/* Structure used to hold buffered outgoing packets of SMTP commands for a +specific socket. The packets which may contain multiple lines when pipelining +is in use. */ + +typedef struct smtp_outblock { + client_conn_ctx * cctx; /* the connection */ + int cmd_count; /* count of buffered commands */ + int buffersize; /* the size of the buffer */ + BOOL authenticating; /* TRUE when authenticating */ + uschar *ptr; /* current position in the buffer */ + uschar *buffer; /* the buffer itself */ + + smtp_connect_args * conn_args; /* to make connection, if not yet made */ +} smtp_outblock; + +/* Structure to hold information about the source of redirection information */ + +typedef struct redirect_block { + uschar *string; /* file name or string */ + uid_t *owners; /* allowed file owners */ + gid_t *owngroups; /* allowed file groups */ + struct passwd *pw; /* possible owner if not NULL */ + int modemask; /* forbidden bits */ + BOOL isfile; /* TRUE if string is a file name */ + BOOL check_owner; /* TRUE, FALSE, or TRUE_UNSET */ + BOOL check_group; /* TRUE, FALSE, or TRUE_UNSET */ +} redirect_block; + +/* Structure for passing arguments to check_host() */ + +typedef struct check_host_block { + const uschar *host_name; + const uschar *host_address; + const uschar *host_ipv4; + BOOL negative; +} check_host_block; + +/* Structure for remembering lookup data when caching the result of +a lookup in a named list. */ + +typedef struct namedlist_cacheblock { + struct namedlist_cacheblock *next; + uschar *key; + uschar *data; +} namedlist_cacheblock; + +/* Structure for holding data for an entry in a named list */ + +typedef struct namedlist_block { + const uschar *string; /* the list string */ + namedlist_cacheblock *cache_data; /* cached domain_data or localpart_data */ + int number; /* the number of the list for caching */ +} namedlist_block; + +/* Structures for Access Control Lists */ + +typedef struct acl_condition_block { + struct acl_condition_block *next; + uschar *arg; + int type; + union { + BOOL negated; + uschar *varname; + } u; +} acl_condition_block; + +typedef struct acl_block { + struct acl_block *next; + acl_condition_block *condition; + int verb; +} acl_block; + +/* smtp transport calc outbound_ip */ +typedef BOOL (*oicf) (uschar *message_id, void *data); + +/* DKIM information for transport */ +struct ob_dkim { + uschar *dkim_domain; + uschar *dkim_identity; + uschar *dkim_private_key; + uschar *dkim_selector; + uschar *dkim_canon; + uschar *dkim_sign_headers; + uschar *dkim_strict; + uschar *dkim_hash; + uschar *dkim_timestamps; + BOOL dot_stuffed; + BOOL force_bodyhash; +#ifdef EXPERIMENTAL_ARC + uschar *arc_signspec; +#endif +}; + +/* End of structs.h */ |