1 /* 2 * Copyright (c) 1999-2004, 2006, 2008 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 * 10 * $Id: mfapi.h,v 8.80 2009/11/06 00:57:08 ca Exp $ 11 */ 12 13 /* 14 ** MFAPI.H -- Global definitions for mail filter library and mail filters. 15 */ 16 17 #ifndef _LIBMILTER_MFAPI_H 18 # define _LIBMILTER_MFAPI_H 1 19 20 #ifndef SMFI_VERSION 21 # if _FFR_MDS_NEGOTIATE 22 # define SMFI_VERSION 0x01000002 /* libmilter version number */ 23 24 /* first libmilter version that has MDS support */ 25 # define SMFI_VERSION_MDS 0x01000002 26 # else /* _FFR_MDS_NEGOTIATE */ 27 # define SMFI_VERSION 0x01000001 /* libmilter version number */ 28 # endif /* _FFR_MDS_NEGOTIATE */ 29 #endif /* ! SMFI_VERSION */ 30 31 #define SM_LM_VRS_MAJOR(v) (((v) & 0x7f000000) >> 24) 32 #define SM_LM_VRS_MINOR(v) (((v) & 0x007fff00) >> 8) 33 #define SM_LM_VRS_PLVL(v) ((v) & 0x0000007f) 34 35 # include <sys/types.h> 36 # include <sys/socket.h> 37 38 #include "libmilter/mfdef.h" 39 40 # define LIBMILTER_API extern 41 42 43 /* Only need to export C interface if used by C++ source code */ 44 #ifdef __cplusplus 45 extern "C" { 46 #endif /* __cplusplus */ 47 48 #ifndef _SOCK_ADDR 49 # define _SOCK_ADDR struct sockaddr 50 #endif /* ! _SOCK_ADDR */ 51 52 /* 53 ** libmilter functions return one of the following to indicate 54 ** success/failure(/continue): 55 */ 56 57 #define MI_SUCCESS 0 58 #define MI_FAILURE (-1) 59 #if _FFR_WORKERS_POOL 60 # define MI_CONTINUE 1 61 #endif /* _FFR_WORKERS_POOL */ 62 63 /* "forward" declarations */ 64 typedef struct smfi_str SMFICTX; 65 typedef struct smfi_str *SMFICTX_PTR; 66 67 typedef struct smfiDesc smfiDesc_str; 68 typedef struct smfiDesc *smfiDesc_ptr; 69 70 /* 71 ** Type which callbacks should return to indicate message status. 72 ** This may take on one of the SMFIS_* values listed below. 73 */ 74 75 typedef int sfsistat; 76 77 #if defined(__linux__) && defined(__GNUC__) && defined(__cplusplus) && __GNUC_MINOR__ >= 8 78 # define SM__P(X) __PMT(X) 79 #else /* __linux__ && __GNUC__ && __cplusplus && _GNUC_MINOR__ >= 8 */ 80 # define SM__P(X) __P(X) 81 #endif /* __linux__ && __GNUC__ && __cplusplus && _GNUC_MINOR__ >= 8 */ 82 83 /* Some platforms don't define __P -- do it for them here: */ 84 #ifndef __P 85 # ifdef __STDC__ 86 # define __P(X) X 87 # else /* __STDC__ */ 88 # define __P(X) () 89 # endif /* __STDC__ */ 90 #endif /* __P */ 91 92 #if SM_CONF_STDBOOL_H 93 # include <stdbool.h> 94 #else /* SM_CONF_STDBOOL_H */ 95 # ifndef __cplusplus 96 # ifndef bool 97 # ifndef __bool_true_false_are_defined 98 typedef int bool; 99 # define false 0 100 # define true 1 101 # define __bool_true_false_are_defined 1 102 # endif /* ! __bool_true_false_are_defined */ 103 # endif /* bool */ 104 # endif /* ! __cplusplus */ 105 #endif /* SM_CONF_STDBOOL_H */ 106 107 /* 108 ** structure describing one milter 109 */ 110 111 struct smfiDesc 112 { 113 char *xxfi_name; /* filter name */ 114 int xxfi_version; /* version code -- do not change */ 115 unsigned long xxfi_flags; /* flags */ 116 117 /* connection info filter */ 118 sfsistat (*xxfi_connect) SM__P((SMFICTX *, char *, _SOCK_ADDR *)); 119 120 /* SMTP HELO command filter */ 121 sfsistat (*xxfi_helo) SM__P((SMFICTX *, char *)); 122 123 /* envelope sender filter */ 124 sfsistat (*xxfi_envfrom) SM__P((SMFICTX *, char **)); 125 126 /* envelope recipient filter */ 127 sfsistat (*xxfi_envrcpt) SM__P((SMFICTX *, char **)); 128 129 /* header filter */ 130 sfsistat (*xxfi_header) SM__P((SMFICTX *, char *, char *)); 131 132 /* end of header */ 133 sfsistat (*xxfi_eoh) SM__P((SMFICTX *)); 134 135 /* body block */ 136 sfsistat (*xxfi_body) SM__P((SMFICTX *, unsigned char *, size_t)); 137 138 /* end of message */ 139 sfsistat (*xxfi_eom) SM__P((SMFICTX *)); 140 141 /* message aborted */ 142 sfsistat (*xxfi_abort) SM__P((SMFICTX *)); 143 144 /* connection cleanup */ 145 sfsistat (*xxfi_close) SM__P((SMFICTX *)); 146 147 /* any unrecognized or unimplemented command filter */ 148 sfsistat (*xxfi_unknown) SM__P((SMFICTX *, const char *)); 149 150 /* SMTP DATA command filter */ 151 sfsistat (*xxfi_data) SM__P((SMFICTX *)); 152 153 /* negotiation callback */ 154 sfsistat (*xxfi_negotiate) SM__P((SMFICTX *, 155 unsigned long, unsigned long, 156 unsigned long, unsigned long, 157 unsigned long *, unsigned long *, 158 unsigned long *, unsigned long *)); 159 160 #if 0 161 /* signal handler callback, not yet implemented. */ 162 int (*xxfi_signal) SM__P((int)); 163 #endif 164 165 }; 166 167 LIBMILTER_API int smfi_opensocket __P((bool)); 168 LIBMILTER_API int smfi_register __P((struct smfiDesc)); 169 LIBMILTER_API int smfi_main __P((void)); 170 LIBMILTER_API int smfi_setbacklog __P((int)); 171 LIBMILTER_API int smfi_setdbg __P((int)); 172 LIBMILTER_API int smfi_settimeout __P((int)); 173 LIBMILTER_API int smfi_setconn __P((char *)); 174 LIBMILTER_API int smfi_stop __P((void)); 175 LIBMILTER_API size_t smfi_setmaxdatasize __P((size_t)); 176 LIBMILTER_API int smfi_version __P((unsigned int *, unsigned int *, unsigned int *)); 177 178 /* 179 ** What the filter might do -- values to be ORed together for 180 ** smfiDesc.xxfi_flags. 181 */ 182 183 #define SMFIF_NONE 0x00000000L /* no flags */ 184 #define SMFIF_ADDHDRS 0x00000001L /* filter may add headers */ 185 #define SMFIF_CHGBODY 0x00000002L /* filter may replace body */ 186 #define SMFIF_MODBODY SMFIF_CHGBODY /* backwards compatible */ 187 #define SMFIF_ADDRCPT 0x00000004L /* filter may add recipients */ 188 #define SMFIF_DELRCPT 0x00000008L /* filter may delete recipients */ 189 #define SMFIF_CHGHDRS 0x00000010L /* filter may change/delete headers */ 190 #define SMFIF_QUARANTINE 0x00000020L /* filter may quarantine envelope */ 191 192 /* filter may change "from" (envelope sender) */ 193 #define SMFIF_CHGFROM 0x00000040L 194 #define SMFIF_ADDRCPT_PAR 0x00000080L /* add recipients incl. args */ 195 196 /* filter can send set of symbols (macros) that it wants */ 197 #define SMFIF_SETSYMLIST 0x00000100L 198 199 200 /* 201 ** Macro "places"; 202 ** Notes: 203 ** - must be coordinated with libmilter/engine.c and sendmail/milter.c 204 ** - the order MUST NOT be changed as it would break compatibility between 205 ** different versions. It's ok to append new entries however 206 ** (hence the list is not sorted by the SMT protocol steps). 207 */ 208 209 #define SMFIM_FIRST 0 /* Do NOT use, internal marker only */ 210 #define SMFIM_CONNECT 0 /* connect */ 211 #define SMFIM_HELO 1 /* HELO/EHLO */ 212 #define SMFIM_ENVFROM 2 /* MAIL From */ 213 #define SMFIM_ENVRCPT 3 /* RCPT To */ 214 #define SMFIM_DATA 4 /* DATA */ 215 #define SMFIM_EOM 5 /* end of message (final dot) */ 216 #define SMFIM_EOH 6 /* end of header */ 217 #define SMFIM_LAST 6 /* Do NOT use, internal marker only */ 218 219 /* 220 ** Continue processing message/connection. 221 */ 222 223 #define SMFIS_CONTINUE 0 224 225 /* 226 ** Reject the message/connection. 227 ** No further routines will be called for this message 228 ** (or connection, if returned from a connection-oriented routine). 229 */ 230 231 #define SMFIS_REJECT 1 232 233 /* 234 ** Accept the message, 235 ** but silently discard the message. 236 ** No further routines will be called for this message. 237 ** This is only meaningful from message-oriented routines. 238 */ 239 240 #define SMFIS_DISCARD 2 241 242 /* 243 ** Accept the message/connection. 244 ** No further routines will be called for this message 245 ** (or connection, if returned from a connection-oriented routine; 246 ** in this case, it causes all messages on this connection 247 ** to be accepted without filtering). 248 */ 249 250 #define SMFIS_ACCEPT 3 251 252 /* 253 ** Return a temporary failure, i.e., 254 ** the corresponding SMTP command will return a 4xx status code. 255 ** In some cases this may prevent further routines from 256 ** being called on this message or connection, 257 ** although in other cases (e.g., when processing an envelope 258 ** recipient) processing of the message will continue. 259 */ 260 261 #define SMFIS_TEMPFAIL 4 262 263 /* 264 ** Do not send a reply to the MTA 265 */ 266 267 #define SMFIS_NOREPLY 7 268 269 /* 270 ** Skip over rest of same callbacks, e.g., body. 271 */ 272 273 #define SMFIS_SKIP 8 274 275 /* xxfi_negotiate: use all existing protocol options/actions */ 276 #define SMFIS_ALL_OPTS 10 277 278 #if 0 279 /* 280 ** Filter Routine Details 281 */ 282 283 /* connection info filter */ 284 extern sfsistat xxfi_connect __P((SMFICTX *, char *, _SOCK_ADDR *)); 285 286 /* 287 ** xxfi_connect(ctx, hostname, hostaddr) Invoked on each connection 288 ** 289 ** char *hostname; Host domain name, as determined by a reverse lookup 290 ** on the host address. 291 ** _SOCK_ADDR *hostaddr; Host address, as determined by a getpeername 292 ** call on the SMTP socket. 293 */ 294 295 /* SMTP HELO command filter */ 296 extern sfsistat xxfi_helo __P((SMFICTX *, char *)); 297 298 /* 299 ** xxfi_helo(ctx, helohost) Invoked on SMTP HELO/EHLO command 300 ** 301 ** char *helohost; Value passed to HELO/EHLO command, which should be 302 ** the domain name of the sending host (but is, in practice, 303 ** anything the sending host wants to send). 304 */ 305 306 /* envelope sender filter */ 307 extern sfsistat xxfi_envfrom __P((SMFICTX *, char **)); 308 309 /* 310 ** xxfi_envfrom(ctx, argv) Invoked on envelope from 311 ** 312 ** char **argv; Null-terminated SMTP command arguments; 313 ** argv[0] is guaranteed to be the sender address. 314 ** Later arguments are the ESMTP arguments. 315 */ 316 317 /* envelope recipient filter */ 318 extern sfsistat xxfi_envrcpt __P((SMFICTX *, char **)); 319 320 /* 321 ** xxfi_envrcpt(ctx, argv) Invoked on each envelope recipient 322 ** 323 ** char **argv; Null-terminated SMTP command arguments; 324 ** argv[0] is guaranteed to be the recipient address. 325 ** Later arguments are the ESMTP arguments. 326 */ 327 328 /* unknown command filter */ 329 330 extern sfsistat *xxfi_unknown __P((SMFICTX *, const char *)); 331 332 /* 333 ** xxfi_unknown(ctx, arg) Invoked when SMTP command is not recognized or not 334 ** implemented. 335 ** const char *arg; Null-terminated SMTP command 336 */ 337 338 /* header filter */ 339 extern sfsistat xxfi_header __P((SMFICTX *, char *, char *)); 340 341 /* 342 ** xxfi_header(ctx, headerf, headerv) Invoked on each message header. The 343 ** content of the header may have folded white space (that is, multiple 344 ** lines with following white space) included. 345 ** 346 ** char *headerf; Header field name 347 ** char *headerv; Header field value 348 */ 349 350 /* end of header */ 351 extern sfsistat xxfi_eoh __P((SMFICTX *)); 352 353 /* 354 ** xxfi_eoh(ctx) Invoked at end of header 355 */ 356 357 /* body block */ 358 extern sfsistat xxfi_body __P((SMFICTX *, unsigned char *, size_t)); 359 360 /* 361 ** xxfi_body(ctx, bodyp, bodylen) Invoked for each body chunk. There may 362 ** be multiple body chunks passed to the filter. End-of-lines are 363 ** represented as received from SMTP (normally Carriage-Return/Line-Feed). 364 ** 365 ** unsigned char *bodyp; Pointer to body data 366 ** size_t bodylen; Length of body data 367 */ 368 369 /* end of message */ 370 extern sfsistat xxfi_eom __P((SMFICTX *)); 371 372 /* 373 ** xxfi_eom(ctx) Invoked at end of message. This routine can perform 374 ** special operations such as modifying the message header, body, or 375 ** envelope. 376 */ 377 378 /* message aborted */ 379 extern sfsistat xxfi_abort __P((SMFICTX *)); 380 381 /* 382 ** xxfi_abort(ctx) Invoked if message is aborted outside of the control of 383 ** the filter, for example, if the SMTP sender issues an RSET command. If 384 ** xxfi_abort is called, xxfi_eom will not be called and vice versa. 385 */ 386 387 /* connection cleanup */ 388 extern sfsistat xxfi_close __P((SMFICTX *)); 389 390 /* 391 ** xxfi_close(ctx) Invoked at end of the connection. This is called on 392 ** close even if the previous mail transaction was aborted. 393 */ 394 #endif /* 0 */ 395 396 /* 397 ** Additional information is passed in to the vendor filter routines using 398 ** symbols. Symbols correspond closely to sendmail macros. The symbols 399 ** defined depend on the context. The value of a symbol is accessed using: 400 */ 401 402 /* Return the value of a symbol. */ 403 LIBMILTER_API char * smfi_getsymval __P((SMFICTX *, char *)); 404 405 /* 406 ** Return the value of a symbol. 407 ** 408 ** SMFICTX *ctx; Opaque context structure 409 ** char *symname; The name of the symbol to access. 410 */ 411 412 /* 413 ** Vendor filter routines that want to pass additional information back to 414 ** the MTA for use in SMTP replies may call smfi_setreply before returning. 415 */ 416 417 LIBMILTER_API int smfi_setreply __P((SMFICTX *, char *, char *, char *)); 418 419 /* 420 ** Alternatively, smfi_setmlreply can be called if a multi-line SMTP reply 421 ** is needed. 422 */ 423 424 LIBMILTER_API int smfi_setmlreply __P((SMFICTX *, const char *, const char *, ...)); 425 426 /* 427 ** Set the specific reply code to be used in response to the active 428 ** command. If not specified, a generic reply code is used. 429 ** 430 ** SMFICTX *ctx; Opaque context structure 431 ** char *rcode; The three-digit (RFC 821) SMTP reply code to be 432 ** returned, e.g., ``551''. 433 ** char *xcode; The extended (RFC 2034) reply code, e.g., ``5.7.6''. 434 ** char *message; The text part of the SMTP reply. 435 */ 436 437 /* 438 ** The xxfi_eom routine is called at the end of a message (essentially, 439 ** after the final DATA dot). This routine can call some special routines 440 ** to modify the envelope, header, or body of the message before the 441 ** message is enqueued. These routines must not be called from any vendor 442 ** routine other than xxfi_eom. 443 */ 444 445 LIBMILTER_API int smfi_addheader __P((SMFICTX *, char *, char *)); 446 447 /* 448 ** Add a header to the message. It is not checked for standards 449 ** compliance; the mail filter must ensure that no protocols are violated 450 ** as a result of adding this header. 451 ** 452 ** SMFICTX *ctx; Opaque context structure 453 ** char *headerf; Header field name 454 ** char *headerv; Header field value 455 */ 456 457 LIBMILTER_API int smfi_chgheader __P((SMFICTX *, char *, int, char *)); 458 459 /* 460 ** Change/delete a header in the message. It is not checked for standards 461 ** compliance; the mail filter must ensure that no protocols are violated 462 ** as a result of adding this header. 463 ** 464 ** SMFICTX *ctx; Opaque context structure 465 ** char *headerf; Header field name 466 ** int index; The Nth occurence of header field name 467 ** char *headerv; New header field value (empty for delete header) 468 */ 469 470 LIBMILTER_API int smfi_insheader __P((SMFICTX *, int, char *, char *)); 471 472 /* 473 ** Insert a header into the message. It is not checked for standards 474 ** compliance; the mail filter must ensure that no protocols are violated 475 ** as a result of adding this header. 476 ** 477 ** SMFICTX *ctx; Opaque context structure 478 ** int idx; index into the header list where the insertion should happen 479 ** char *headerh; Header field name 480 ** char *headerv; Header field value 481 */ 482 483 LIBMILTER_API int smfi_chgfrom __P((SMFICTX *, char *, char *)); 484 485 /* 486 ** Modify envelope sender address 487 ** 488 ** SMFICTX *ctx; Opaque context structure 489 ** char *mail; New envelope sender address 490 ** char *args; ESMTP arguments 491 */ 492 493 494 LIBMILTER_API int smfi_addrcpt __P((SMFICTX *, char *)); 495 496 /* 497 ** Add a recipient to the envelope 498 ** 499 ** SMFICTX *ctx; Opaque context structure 500 ** char *rcpt; Recipient to be added 501 */ 502 503 LIBMILTER_API int smfi_addrcpt_par __P((SMFICTX *, char *, char *)); 504 505 /* 506 ** Add a recipient to the envelope 507 ** 508 ** SMFICTX *ctx; Opaque context structure 509 ** char *rcpt; Recipient to be added 510 ** char *args; ESMTP arguments 511 */ 512 513 514 LIBMILTER_API int smfi_delrcpt __P((SMFICTX *, char *)); 515 516 /* 517 ** Send a "no-op" up to the MTA to tell it we're still alive, so long 518 ** milter-side operations don't time out. 519 ** 520 ** SMFICTX *ctx; Opaque context structure 521 */ 522 523 LIBMILTER_API int smfi_progress __P((SMFICTX *)); 524 525 /* 526 ** Delete a recipient from the envelope 527 ** 528 ** SMFICTX *ctx; Opaque context structure 529 ** char *rcpt; Envelope recipient to be deleted. This should be in 530 ** exactly the form passed to xxfi_envrcpt or the address may 531 ** not be deleted. 532 */ 533 534 LIBMILTER_API int smfi_replacebody __P((SMFICTX *, unsigned char *, int)); 535 536 /* 537 ** Replace the body of the message. This routine may be called multiple 538 ** times if the body is longer than convenient to send in one call. End of 539 ** line should be represented as Carriage-Return/Line Feed. 540 ** 541 ** char *bodyp; Pointer to block of body information to insert 542 ** int bodylen; Length of data pointed at by bodyp 543 */ 544 545 /* 546 ** If the message is aborted (for example, if the SMTP sender sends the 547 ** envelope but then does a QUIT or RSET before the data is sent), 548 ** xxfi_abort is called. This can be used to reset state. 549 */ 550 551 /* 552 ** Quarantine an envelope 553 ** 554 ** SMFICTX *ctx; Opaque context structure 555 ** char *reason: explanation 556 */ 557 558 LIBMILTER_API int smfi_quarantine __P((SMFICTX *ctx, char *reason)); 559 560 /* 561 ** Connection-private data (specific to an SMTP connection) can be 562 ** allocated using the smfi_setpriv routine; routines can access private 563 ** data using smfi_getpriv. 564 */ 565 566 LIBMILTER_API int smfi_setpriv __P((SMFICTX *, void *)); 567 568 /* 569 ** Set the private data pointer 570 ** 571 ** SMFICTX *ctx; Opaque context structure 572 ** void *privatedata; Pointer to private data area 573 */ 574 575 LIBMILTER_API void *smfi_getpriv __P((SMFICTX *)); 576 577 /* 578 ** Get the private data pointer 579 ** 580 ** SMFICTX *ctx; Opaque context structure 581 ** void *privatedata; Pointer to private data area 582 */ 583 584 LIBMILTER_API int smfi_setsymlist __P((SMFICTX *, int, char *)); 585 586 /* 587 ** Set list of symbols (macros) to receive 588 ** 589 ** SMFICTX *ctx; Opaque context structure 590 ** int where; where in the SMTP dialogue should the macros be sent 591 ** char *macros; list of macros (space separated) 592 */ 593 594 #if _FFR_THREAD_MONITOR 595 LIBMILTER_API int smfi_set_max_exec_time __P((unsigned int)); 596 #endif /* _FFR_THREAD_MONITOR */ 597 598 #ifdef __cplusplus 599 } 600 #endif /* __cplusplus */ 601 602 #endif /* ! _LIBMILTER_MFAPI_H */ 603