src/src/functions.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 /* Prototypes for functions that appear in various modules. Gathered together
  10 to avoid having a lot of tiddly little headers with only a couple of lines in
  11 them. However, some functions that are used (or not used) by utility programs
  12 are in in fact in separate headers. */
  13
  14
  15 #ifdef EXIM_PERL
  16 extern gstring *call_perl_cat(gstring *, uschar **, uschar *,
  17                  uschar **) WARN_UNUSED_RESULT;
  18 extern void    cleanup_perl(void);
  19 extern uschar *init_perl(uschar *);
  20 #endif
  21
  22
  23 #ifdef SUPPORT_TLS
  24 extern const char *
  25                std_dh_prime_default(void);
  26 extern const char *
  27                std_dh_prime_named(const uschar *);
  28
  29 extern uschar * tls_cert_crl_uri(void *, uschar * mod);
  30 extern uschar * tls_cert_ext_by_oid(void *, uschar *, int);
  31 extern uschar * tls_cert_issuer(void *, uschar * mod);
  32 extern uschar * tls_cert_not_before(void *, uschar * mod);
  33 extern uschar * tls_cert_not_after(void *, uschar * mod);
  34 extern uschar * tls_cert_ocsp_uri(void *, uschar * mod);
  35 extern uschar * tls_cert_serial_number(void *, uschar * mod);
  36 extern uschar * tls_cert_signature(void *, uschar * mod);
  37 extern uschar * tls_cert_signature_algorithm(void *, uschar * mod);
  38 extern uschar * tls_cert_subject(void *, uschar * mod);
  39 extern uschar * tls_cert_subject_altname(void *, uschar * mod);
  40 extern uschar * tls_cert_version(void *, uschar * mod);
  41
  42 extern uschar * tls_cert_der_b64(void * cert);
  43 extern uschar * tls_cert_fprt_md5(void *);
  44 extern uschar * tls_cert_fprt_sha1(void *);
  45 extern uschar * tls_cert_fprt_sha256(void *);
  46
  47 extern int     tls_client_start(int, host_item *, address_item *,
  48                  transport_instance *,
  49 # ifdef EXPERIMENTAL_DANE
  50                 dns_answer *,
  51 # endif
  52                 uschar **);
  53 extern void    tls_close(BOOL, BOOL);
  54 extern BOOL    tls_could_read(void);
  55 extern int     tls_export_cert(uschar *, size_t, void *);
  56 extern int     tls_feof(void);
  57 extern int     tls_ferror(void);
  58 extern void    tls_free_cert(void **);
  59 extern int     tls_getc(unsigned);
  60 extern uschar *tls_getbuf(unsigned *);
  61 extern void    tls_get_cache(void);
  62 extern int     tls_import_cert(const uschar *, void **);
  63 extern int     tls_read(BOOL, uschar *, size_t);
  64 extern int     tls_server_start(const uschar *, uschar **);
  65 extern BOOL    tls_smtp_buffered(void);
  66 extern int     tls_ungetc(int);
  67 extern int     tls_write(BOOL, const uschar *, size_t, BOOL);
  68 extern uschar *tls_validate_require_cipher(void);
  69 extern void    tls_version_report(FILE *);
  70 # ifndef USE_GNUTLS
  71 extern BOOL    tls_openssl_options_parse(uschar *, long *);
  72 # endif
  73 extern uschar * tls_field_from_dn(uschar *, const uschar *);
  74 extern BOOL    tls_is_name_for_cert(const uschar *, void *);
  75
  76 # ifdef EXPERIMENTAL_DANE
  77 extern int     tlsa_lookup(const host_item *, dns_answer *, BOOL);
  78 # endif
  79
  80 #endif  /*SUPPORT_TLS*/
  81
  82
  83 /* Everything else... */
  84
  85 extern acl_block *acl_read(uschar *(*)(void), uschar **);
  86 extern int     acl_check(int, uschar *, uschar *, uschar **, uschar **);
  87 extern int     acl_eval(int, uschar *, uschar **, uschar **);
  88
  89 extern tree_node *acl_var_create(uschar *);
  90 extern void    acl_var_write(uschar *, uschar *, void *);
  91 extern void    assert_no_variables(void *, int, const char *, int);
  92 extern int     auth_call_pam(const uschar *, uschar **);
  93 extern int     auth_call_pwcheck(uschar *, uschar **);
  94 extern int     auth_call_radius(const uschar *, uschar **);
  95 extern int     auth_call_saslauthd(const uschar *, const uschar *,
  96                  const uschar *, const uschar *, uschar **);
  97 extern int     auth_check_serv_cond(auth_instance *);
  98 extern int     auth_check_some_cond(auth_instance *, uschar *, uschar *, int);
  99
 100
 101 extern int     auth_get_data(uschar **, uschar *, int);
 102 extern int     auth_get_no64_data(uschar **, uschar *);
 103 extern uschar *auth_xtextencode(uschar *, int);
 104 extern int     auth_xtextdecode(uschar *, uschar **);
 105
 106 extern uschar *b64encode(uschar *, int);
 107 extern int     b64decode(const uschar *, uschar **);
 108 extern int     bdat_getc(unsigned);
 109 extern uschar *bdat_getbuf(unsigned *);
 110 extern int     bdat_ungetc(int);
 111 extern void    bdat_flush_data(void);
 112
 113 extern void    bits_clear(unsigned int *, size_t, int *);
 114 extern void    bits_set(unsigned int *, size_t, int *);
 115
 116 extern void    cancel_cutthrough_connection(BOOL, const uschar *);
 117 extern int     check_host(void *, const uschar *, const uschar **, uschar **);
 118 extern uschar **child_exec_exim(int, BOOL, int *, BOOL, int, ...);
 119 extern pid_t   child_open_uid(const uschar **, const uschar **, int,
 120                  uid_t *, gid_t *, int *, int *, uschar *, BOOL);
 121 extern BOOL    cleanup_environment(void);
 122 extern void    cutthrough_data_puts(uschar *, int);
 123 extern void    cutthrough_data_put_nl(void);
 124 extern uschar *cutthrough_finaldot(void);
 125 extern BOOL    cutthrough_flush_send(void);
 126 extern BOOL    cutthrough_headers_send(void);
 127 extern BOOL    cutthrough_predata(void);
 128 extern void    release_cutthrough_connection(const uschar *);
 129
 130 extern void    daemon_go(void);
 131
 132 #ifdef EXPERIMENTAL_DCC
 133 extern int     dcc_process(uschar **);
 134 #endif
 135
 136 extern void    debug_logging_activate(uschar *, uschar *);
 137 extern void    debug_logging_stop(void);
 138 extern void    debug_print_argv(const uschar **);
 139 extern void    debug_print_ids(uschar *);
 140 extern void    debug_printf_indent(const char *, ...) PRINTF_FUNCTION(1,2);
 141 extern void    debug_print_string(uschar *);
 142 extern void    debug_print_tree(tree_node *);
 143 extern void    debug_vprintf(int, const char *, va_list);
 144 extern void    decode_bits(unsigned int *, size_t, int *,
 145                    uschar *, bit_table *, int, uschar *, int);
 146 extern address_item *deliver_make_addr(uschar *, BOOL);
 147 extern void    deliver_init(void);
 148 extern void    delivery_log(int, address_item *, int, uschar *);
 149 extern int     deliver_message(uschar *, BOOL, BOOL);
 150 extern void    deliver_msglog(const char *, ...) PRINTF_FUNCTION(1,2);
 151 extern void    deliver_set_expansions(address_item *);
 152 extern int     deliver_split_address(address_item *);
 153 extern void    deliver_succeeded(address_item *);
 154
 155 extern uschar *deliver_get_sender_address (uschar *id);
 156 extern void    delivery_re_exec(int);
 157
 158 extern BOOL    directory_make(const uschar *, const uschar *, int, BOOL);
 159 #ifndef DISABLE_DKIM
 160 extern BOOL    dkim_transport_write_message(transport_ctx *,
 161                   struct ob_dkim *, const uschar ** errstr);
 162 #endif
 163 extern dns_address *dns_address_from_rr(dns_answer *, dns_record *);
 164 extern int     dns_basic_lookup(dns_answer *, const uschar *, int);
 165 extern void    dns_build_reverse(const uschar *, uschar *);
 166 extern void    dns_init(BOOL, BOOL, BOOL);
 167 extern BOOL    dns_is_aa(const dns_answer *);
 168 extern BOOL    dns_is_secure(const dns_answer *);
 169 extern int     dns_lookup(dns_answer *, const uschar *, int, const uschar **);
 170 extern void    dns_pattern_init(void);
 171 extern int     dns_special_lookup(dns_answer *, const uschar *, int, const uschar **);
 172 extern dns_record *dns_next_rr(const dns_answer *, dns_scan *, int);
 173 extern uschar *dns_text_type(int);
 174 extern void    dscp_list_to_stream(FILE *);
 175 extern BOOL    dscp_lookup(const uschar *, int, int *, int *, int *);
 176
 177 extern void    enq_end(uschar *);
 178 extern BOOL    enq_start(uschar *, unsigned);
 179 #ifndef DISABLE_EVENT
 180 extern uschar *event_raise(uschar *, const uschar *, uschar *);
 181 extern void    msg_event_raise(const uschar *, const address_item *);
 182 #endif
 183 extern const uschar * exim_errstr(int);
 184 extern void    exim_exit(int);
 185 extern void    exim_nullstd(void);
 186 extern void    exim_setugid(uid_t, gid_t, BOOL, uschar *);
 187 extern void    exim_wait_tick(struct timeval *, int);
 188 extern int     exp_bool(address_item *addr,
 189   uschar *mtype, uschar *mname, unsigned dgb_opt, uschar *oname, BOOL bvalue,
 190   uschar *svalue, BOOL *rvalue);
 191 extern BOOL    expand_check_condition(uschar *, uschar *, uschar *);
 192 extern uschar *expand_string(uschar *); /* public, cannot make const */
 193 extern const uschar *expand_cstring(const uschar *); /* ... so use this one */
 194 extern uschar *expand_hide_passwords(uschar * );
 195 extern uschar *expand_string_copy(const uschar *);
 196 extern int_eximarith_t expand_string_integer(uschar *, BOOL);
 197 extern void    modify_variable(uschar *, void *);
 198
 199 extern BOOL    fd_ready(int, int);
 200
 201 extern int     filter_interpret(uschar *, int, address_item **, uschar **);
 202 extern BOOL    filter_personal(string_item *, BOOL);
 203 extern BOOL    filter_runtest(int, uschar *, BOOL, BOOL);
 204 extern BOOL    filter_system_interpret(address_item **, uschar **);
 205
 206 extern uschar * fn_hdrs_added(void);
 207
 208 extern void    gstring_grow(gstring *, int, int);
 209
 210 extern void    header_add(int, const char *, ...);
 211 extern int     header_checkname(header_line *, BOOL);
 212 extern BOOL    header_match(uschar *, BOOL, BOOL, string_item *, int, ...);
 213 extern int     host_address_extract_port(uschar *);
 214 extern uschar *host_and_ident(BOOL);
 215 extern int     host_aton(const uschar *, int *);
 216 extern void    host_build_hostlist(host_item **, const uschar *, BOOL);
 217 extern ip_address_item *host_build_ifacelist(const uschar *, uschar *);
 218 extern void    host_build_log_info(void);
 219 extern void    host_build_sender_fullhost(void);
 220 extern int     host_find_byname(host_item *, const uschar *, int,
 221                                 const uschar **, BOOL);
 222 extern int     host_find_bydns(host_item *, const uschar *, int, uschar *, uschar *,
 223                  uschar *, const dnssec_domains *, const uschar **, BOOL *);
 224 extern ip_address_item *host_find_interfaces(void);
 225 extern BOOL    host_is_in_net(const uschar *, const uschar *, int);
 226 extern BOOL    host_is_tls_on_connect_port(int);
 227 extern int     host_item_get_port(host_item *);
 228 extern void    host_mask(int, int *, int);
 229 extern int     host_name_lookup(void);
 230 extern int     host_nmtoa(int, int *, int, uschar *, int);
 231 extern uschar *host_ntoa(int, const void *, uschar *, int *);
 232 extern int     host_scan_for_local_hosts(host_item *, host_item **, BOOL *);
 233
 234 extern uschar *imap_utf7_encode(uschar *, const uschar *,
 235                                  uschar, uschar *, uschar **);
 236
 237 extern void    invert_address(uschar *, uschar *);
 238 extern int     ip_addr(void *, int, const uschar *, int);
 239 extern int     ip_bind(int, int, uschar *, int);
 240 extern int     ip_connect(int, int, const uschar *, int, int, const blob *);
 241 extern int     ip_connectedsocket(int, const uschar *, int, int,
 242                  int, host_item *, uschar **, const blob *);
 243 extern int     ip_get_address_family(int);
 244 extern void    ip_keepalive(int, const uschar *, BOOL);
 245 extern int     ip_recv(int, uschar *, int, int);
 246 extern int     ip_socket(int, int);
 247
 248 extern int     ip_tcpsocket(const uschar *, uschar **, int);
 249 extern int     ip_unixsocket(const uschar *, uschar **);
 250 extern int     ip_streamsocket(const uschar *, uschar **, int);
 251
 252 extern int     ipv6_nmtoa(int *, uschar *);
 253
 254 extern uschar *local_part_quote(uschar *);
 255 extern int     log_create(uschar *);
 256 extern int     log_create_as_exim(uschar *);
 257 extern void    log_close_all(void);
 258
 259 extern macro_item * macro_create(const uschar *, const uschar *, BOOL);
 260 extern void    mainlog_close(void);
 261 #ifdef WITH_CONTENT_SCAN
 262 extern int     malware(const uschar *, int);
 263 extern int     malware_in_file(uschar *);
 264 extern void    malware_init(void);
 265 #endif
 266 extern int     match_address_list(const uschar *, BOOL, BOOL, const uschar **,
 267                  unsigned int *, int, int, const uschar **);
 268 extern int     match_address_list_basic(const uschar *, const uschar **, int);
 269 extern int     match_check_list(const uschar **, int, tree_node **, unsigned int **,
 270                  int(*)(void *, const uschar *, const uschar **, uschar **), void *, int,
 271                  const uschar *, const uschar **);
 272 extern int     match_isinlist(const uschar *, const uschar **, int, tree_node **,
 273                  unsigned int *, int, BOOL, const uschar **);
 274 extern int     match_check_string(const uschar *, const uschar *, int, BOOL, BOOL, BOOL,
 275                  const uschar **);
 276 extern void    md5_end(md5 *, const uschar *, int, uschar *);
 277 extern void    md5_mid(md5 *, const uschar *);
 278 extern void    md5_start(md5 *);
 279 extern void    millisleep(int);
 280 #ifdef WITH_CONTENT_SCAN
 281 struct mime_boundary_context;
 282 extern int     mime_acl_check(uschar *acl, FILE *f,
 283                  struct mime_boundary_context *, uschar **, uschar **);
 284 extern int     mime_decode(const uschar **);
 285 extern ssize_t mime_decode_base64(FILE *, FILE *, uschar *);
 286 extern int     mime_regex(const uschar **);
 287 extern void    mime_set_anomaly(int);
 288 #endif
 289 extern uschar *moan_check_errorcopy(uschar *);
 290 extern BOOL    moan_skipped_syntax_errors(uschar *, error_block *, uschar *,
 291                  BOOL, uschar *);
 292 extern void    moan_smtp_batch(uschar *, const char *, ...) PRINTF_FUNCTION(2,3);
 293 extern void    moan_tell_someone(uschar *, address_item *,
 294                  const uschar *, const char *, ...) PRINTF_FUNCTION(4,5);
 295 extern BOOL    moan_to_sender(int, error_block *, header_line *, FILE *, BOOL);
 296 extern void    moan_write_from(FILE *);
 297 extern FILE   *modefopen(const uschar *, const char *, mode_t);
 298
 299 extern int     open_cutthrough_connection( address_item * addr );
 300
 301 extern uschar *parse_extract_address(uschar *, uschar **, int *, int *, int *,
 302                  BOOL);
 303 extern int     parse_forward_list(uschar *, int, address_item **, uschar **,
 304                  const uschar *, uschar *, error_block **);
 305 extern uschar *parse_find_address_end(uschar *, BOOL);
 306 extern uschar *parse_find_at(uschar *);
 307 extern const uschar *parse_fix_phrase(const uschar *, int, uschar *, int);
 308 extern uschar *parse_message_id(uschar *, uschar **, uschar **);
 309 extern const uschar *parse_quote_2047(const uschar *, int, uschar *, uschar *, int, BOOL);
 310 extern uschar *parse_date_time(uschar *str, time_t *t);
 311 extern int     vaguely_random_number(int);
 312 #ifdef SUPPORT_TLS
 313 extern int     vaguely_random_number_fallback(int);
 314 #endif
 315
 316 extern BOOL    queue_action(uschar *, int, uschar **, int, int);
 317 extern void    queue_check_only(void);
 318 extern void    queue_list(int, uschar **, int);
 319 extern void    queue_count(void);
 320 extern void    queue_run(uschar *, uschar *, BOOL);
 321
 322 extern int     random_number(int);
 323 extern int     rda_interpret(redirect_block *, int, uschar *, uschar *,
 324                  uschar *, uschar *, uschar *, ugid_block *, address_item **,
 325                  uschar **, error_block **, int *, uschar *);
 326 extern int     rda_is_filter(const uschar *);
 327 extern BOOL    readconf_depends(driver_instance *, uschar *);
 328 extern void    readconf_driver_init(uschar *, driver_instance **,
 329                  driver_info *, int, void *, int, optionlist *, int);
 330 extern uschar *readconf_find_option(void *);
 331 extern void    readconf_main(BOOL);
 332 extern void    readconf_options_from_list(optionlist *, unsigned, const uschar *, uschar *);
 333 extern void    readconf_print(uschar *, uschar *, BOOL);
 334 extern uschar *readconf_printtime(int);
 335 extern uschar *readconf_readname(uschar *, int, uschar *);
 336 extern int     readconf_readtime(const uschar *, int, BOOL);
 337 extern void    readconf_rest(void);
 338 extern uschar *readconf_retry_error(const uschar *, const uschar *, int *, int *);
 339 extern void    readconf_save_config(const uschar *);
 340 extern void    read_message_body(BOOL);
 341 extern void    receive_bomb_out(uschar *, uschar *);
 342 extern BOOL    receive_check_fs(int);
 343 extern BOOL    receive_check_set_sender(uschar *);
 344 extern BOOL    receive_msg(BOOL);
 345 extern int     receive_statvfs(BOOL, int *);
 346 extern void    receive_swallow_smtp(void);
 347 #ifdef WITH_CONTENT_SCAN
 348 extern int     regex(const uschar **);
 349 #endif
 350 extern BOOL    regex_match_and_setup(const pcre *, const uschar *, int, int);
 351 extern const pcre *regex_must_compile(const uschar *, BOOL, BOOL);
 352 extern void    retry_add_item(address_item *, uschar *, int);
 353 extern BOOL    retry_check_address(const uschar *, host_item *, uschar *, BOOL,
 354                  uschar **, uschar **);
 355 extern retry_config *retry_find_config(const uschar *, const uschar *, int, int);
 356 extern BOOL    retry_ultimate_address_timeout(uschar *, const uschar *,
 357                  dbdata_retry *, time_t);
 358 extern void    retry_update(address_item **, address_item **, address_item **);
 359 extern uschar *rewrite_address(uschar *, BOOL, BOOL, rewrite_rule *, int);
 360 extern uschar *rewrite_address_qualify(uschar *, BOOL);
 361 extern header_line *rewrite_header(header_line *,
 362                const uschar *, const uschar *,
 363                rewrite_rule *, int, BOOL);
 364 extern uschar *rewrite_one(uschar *, int, BOOL *, BOOL, uschar *,
 365                  rewrite_rule *);
 366 extern void    rewrite_test(uschar *);
 367 extern uschar *rfc2047_decode2(uschar *, BOOL, uschar *, int, int *, int *,
 368                  uschar **);
 369 extern int     route_address(address_item *, address_item **, address_item **,
 370                  address_item **, address_item **, int);
 371 extern int     route_check_prefix(const uschar *, const uschar *);
 372 extern int     route_check_suffix(const uschar *, const uschar *);
 373 extern BOOL    route_findgroup(uschar *, gid_t *);
 374 extern BOOL    route_finduser(const uschar *, struct passwd **, uid_t *);
 375 extern BOOL    route_find_expanded_group(uschar *, uschar *, uschar *, gid_t *,
 376                  uschar **);
 377 extern BOOL    route_find_expanded_user(uschar *, uschar *, uschar *,
 378                  struct passwd **, uid_t *, uschar **);
 379 extern void    route_init(void);
 380 extern void    route_tidyup(void);
 381
 382 extern uschar *search_find(void *, uschar *, uschar *, int, const uschar *, int,
 383                  int, int *);
 384 extern int     search_findtype(const uschar *, int);
 385 extern int     search_findtype_partial(const uschar *, int *, const uschar **, int *,
 386                  int *);
 387 extern void   *search_open(uschar *, int, int, uid_t *, gid_t *);
 388 extern void    search_tidyup(void);
 389 extern void    set_process_info(const char *, ...) PRINTF_FUNCTION(1,2);
 390 extern void    sha1_end(hctx *, const uschar *, int, uschar *);
 391 extern void    sha1_mid(hctx *, const uschar *);
 392 extern void    sha1_start(hctx *);
 393 extern int     sieve_interpret(uschar *, int, uschar *, uschar *, uschar *,
 394                  uschar *, address_item **, uschar **);
 395 extern void    sigalrm_handler(int);
 396 extern BOOL    smtp_buffered(void);
 397 extern void    smtp_closedown(uschar *);
 398 extern uschar *smtp_cmd_hist(void);
 399 extern int     smtp_connect(host_item *, int, uschar *, int,
 400                  transport_instance *);
 401 extern int     smtp_sock_connect(host_item *, int, int, uschar *,
 402                  transport_instance * tb, int, const blob *);
 403 extern int     smtp_feof(void);
 404 extern int     smtp_ferror(void);
 405 extern uschar *smtp_get_connection_info(void);
 406 extern BOOL    smtp_get_interface(uschar *, int, address_item *,
 407                  uschar **, uschar *);
 408 extern BOOL    smtp_get_port(uschar *, address_item *, int *, uschar *);
 409 extern int     smtp_getc(unsigned);
 410 extern uschar *smtp_getbuf(unsigned *);
 411 extern void    smtp_get_cache(void);
 412 extern int     smtp_handle_acl_fail(int, int, uschar *, uschar *);
 413 extern void    smtp_log_no_mail(void);
 414 extern void    smtp_message_code(uschar **, int *, uschar **, uschar **, BOOL);
 415 extern void    smtp_proxy_tls(uschar *, size_t, int, int);
 416 extern BOOL    smtp_read_response(smtp_inblock *, uschar *, int, int, int);
 417 extern void    smtp_respond(uschar *, int, BOOL, uschar *);
 418 extern void    smtp_notquit_exit(uschar *, uschar *, uschar *, ...);
 419 extern void    smtp_port_for_connect(host_item *, int);
 420 extern void    smtp_send_prohibition_message(int, uschar *);
 421 extern int     smtp_setup_msg(void);
 422 extern BOOL    smtp_start_session(void);
 423 extern int     smtp_ungetc(int);
 424 extern BOOL    smtp_verify_helo(void);
 425 extern int     smtp_write_command(smtp_outblock *, int, const char *, ...) PRINTF_FUNCTION(3,4);
 426 #ifdef WITH_CONTENT_SCAN
 427 extern int     spam(const uschar **);
 428 extern FILE   *spool_mbox(unsigned long *, const uschar *, uschar **);
 429 #endif
 430 extern BOOL    spool_move_message(uschar *, uschar *, uschar *, uschar *);
 431 extern uschar *spool_dname(const uschar *, uschar *);
 432 extern uschar *spool_fname(const uschar *, const uschar *, const uschar *, const uschar *);
 433 extern uschar *spool_sname(const uschar *, uschar *);
 434 extern int     spool_open_datafile(uschar *);
 435 extern int     spool_open_temp(uschar *);
 436 extern int     spool_read_header(uschar *, BOOL, BOOL);
 437 extern int     spool_write_header(uschar *, int, uschar **);
 438 extern int     stdin_getc(unsigned);
 439 extern int     stdin_feof(void);
 440 extern int     stdin_ferror(void);
 441 extern int     stdin_ungetc(int);
 442 extern gstring *string_append(gstring *, int, ...) WARN_UNUSED_RESULT;
 443 extern gstring *string_append_listele(gstring *, uschar, const uschar *) WARN_UNUSED_RESULT;
 444 extern gstring *string_append_listele_n(gstring *, uschar, const uschar *, unsigned) WARN_UNUSED_RESULT;
 445 extern uschar *string_base62(unsigned long int);
 446 extern gstring *string_cat (gstring *, const uschar *     ) WARN_UNUSED_RESULT;
 447 extern gstring *string_catn(gstring *, const uschar *, int) WARN_UNUSED_RESULT;
 448 extern int     string_compare_by_pointer(const void *, const void *);
 449 extern uschar *string_copy_dnsdomain(uschar *);
 450 extern uschar *string_copy_malloc(const uschar *);
 451 extern uschar *string_copylc(const uschar *);
 452 extern uschar *string_copynlc(uschar *, int);
 453 extern uschar *string_dequote(const uschar **);
 454 extern BOOL    string_format(uschar *, int, const char *, ...) ALMOST_PRINTF(3,4);
 455 extern uschar *string_format_size(int, uschar *);
 456 extern uschar *string_from_gstring(gstring *);
 457 extern gstring *string_get(unsigned);
 458 extern int     string_interpret_escape(const uschar **);
 459 extern int     string_is_ip_address(const uschar *, int *);
 460 #ifdef SUPPORT_I18N
 461 extern BOOL    string_is_utf8(const uschar *);
 462 #endif
 463 extern uschar *string_nextinlist(const uschar **, int *, uschar *, int);
 464 extern uschar *string_open_failed(int, const char *, ...) PRINTF_FUNCTION(2,3);
 465 extern const uschar *string_printing2(const uschar *, BOOL);
 466 extern uschar *string_split_message(uschar *);
 467 extern uschar *string_timesince(struct timeval *);
 468 extern uschar *string_unprinting(uschar *);
 469 #ifdef SUPPORT_I18N
 470 extern uschar *string_address_utf8_to_alabel(const uschar *, uschar **);
 471 extern uschar *string_domain_alabel_to_utf8(const uschar *, uschar **);
 472 extern uschar *string_domain_utf8_to_alabel(const uschar *, uschar **);
 473 extern uschar *string_localpart_alabel_to_utf8(const uschar *, uschar **);
 474 extern uschar *string_localpart_utf8_to_alabel(const uschar *, uschar **);
 475 #endif
 476 extern BOOL    string_vformat(uschar *, int, const char *, va_list);
 477 extern int     strcmpic(const uschar *, const uschar *);
 478 extern int     strncmpic(const uschar *, const uschar *, int);
 479 extern uschar *strstric(uschar *, uschar *, BOOL);
 480
 481 extern void    timesince(struct timeval * diff, struct timeval * then);
 482 extern void    tls_modify_variables(tls_support *);
 483 extern uschar *tod_stamp(int);
 484
 485 extern BOOL    transport_check_waiting(const uschar *, const uschar *, int, uschar *,
 486                  BOOL *, oicf, void*);
 487 extern void    transport_init(void);
 488 extern void    transport_do_pass_socket(const uschar *, const uschar *,
 489                  const uschar *, uschar *, int);
 490 extern BOOL    transport_pass_socket(const uschar *, const uschar *, const uschar *, uschar *,
 491                  int);
 492 extern uschar *transport_rcpt_address(address_item *, BOOL);
 493 extern BOOL    transport_set_up_command(const uschar ***, uschar *,
 494                  BOOL, int, address_item *, uschar *, uschar **);
 495 extern void    transport_update_waiting(host_item *, uschar *);
 496 extern BOOL    transport_write_block(transport_ctx *, uschar *, int, BOOL);
 497 extern void    transport_write_reset(int);
 498 extern BOOL    transport_write_string(int, const char *, ...);
 499 extern BOOL    transport_headers_send(transport_ctx *,
 500                  BOOL (*)(transport_ctx *, uschar *, int));
 501 extern BOOL    transport_write_message(transport_ctx *, int);
 502 extern void    tree_add_duplicate(uschar *, address_item *);
 503 extern void    tree_add_nonrecipient(uschar *);
 504 extern void    tree_add_unusable(host_item *);
 505 extern int     tree_insertnode(tree_node **, tree_node *);
 506 extern tree_node *tree_search(tree_node *, const uschar *);
 507 extern void    tree_write(tree_node *, FILE *);
 508 extern void    tree_walk(tree_node *, void (*)(uschar*, uschar*, void*), void *);
 509
 510 #ifdef WITH_CONTENT_SCAN
 511 extern void    unspool_mbox(void);
 512 #endif
 513 #ifdef SUPPORT_I18N
 514 extern void    utf8_version_report(FILE *);
 515 #endif
 516
 517 extern int     verify_address(address_item *, FILE *, int, int, int, int,
 518                  uschar *, uschar *, BOOL *);
 519 extern int     verify_check_dnsbl(int, const uschar **, uschar **);
 520 extern int     verify_check_header_address(uschar **, uschar **, int, int, int,
 521                  uschar *, uschar *, int, int *);
 522 extern int     verify_check_headers(uschar **);
 523 extern int     verify_check_header_names_ascii(uschar **);
 524 extern int     verify_check_host(uschar **);
 525 extern int     verify_check_notblind(void);
 526 extern int     verify_check_given_host(uschar **, host_item *);
 527 extern int     verify_check_this_host(const uschar **, unsigned int *,
 528                  const uschar*, const uschar *, const uschar **);
 529 extern address_item *verify_checked_sender(uschar *);
 530 extern void    verify_get_ident(int);
 531 extern BOOL    verify_sender(int *, uschar **);
 532 extern BOOL    verify_sender_preliminary(int *, uschar **);
 533 extern void    version_init(void);
 534
 535 extern BOOL    write_chunk(transport_ctx *, uschar *, int);
 536 extern ssize_t write_to_fd_buf(int, const uschar *, size_t);
 537
 538
 539 /* vi: aw
 540 */
 541 /* End of functions.h */