1 /* 2 * Copyright (c) 1999-2004, 2006, 2007 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 11 #pragma ident "%Z%%M% %I% %E% SMI" 12 13 #include <sm/gen.h> 14 SM_RCSID("@(#)$Id: engine.c,v 8.159 2007/04/23 22:22:50 ca Exp $") 15 16 #include "libmilter.h" 17 18 #if NETINET || NETINET6 19 # include <arpa/inet.h> 20 #endif /* NETINET || NETINET6 */ 21 22 /* generic argument for functions in the command table */ 23 struct arg_struct 24 { 25 size_t a_len; /* length of buffer */ 26 char *a_buf; /* argument string */ 27 int a_idx; /* index for macro array */ 28 SMFICTX_PTR a_ctx; /* context */ 29 }; 30 31 typedef struct arg_struct genarg; 32 33 /* structure for commands received from MTA */ 34 struct cmdfct_t 35 { 36 char cm_cmd; /* command */ 37 int cm_argt; /* type of arguments expected */ 38 int cm_next; /* next state */ 39 int cm_todo; /* what to do next */ 40 int cm_macros; /* index for macros */ 41 int (*cm_fct) __P((genarg *)); /* function to execute */ 42 }; 43 44 typedef struct cmdfct_t cmdfct; 45 46 /* possible values for cm_argt */ 47 #define CM_ARG0 0 /* no args */ 48 #define CM_ARG1 1 /* one arg (string) */ 49 #define CM_ARG2 2 /* two args (strings) */ 50 #define CM_ARGA 4 /* one string and _SOCK_ADDR */ 51 #define CM_ARGO 5 /* two integers */ 52 #define CM_ARGV 8 /* \0 separated list of args, NULL-terminated */ 53 #define CM_ARGN 9 /* \0 separated list of args (strings) */ 54 55 /* possible values for cm_todo */ 56 #define CT_CONT 0x0000 /* continue reading commands */ 57 #define CT_IGNO 0x0001 /* continue even when error */ 58 59 /* not needed right now, done via return code instead */ 60 #define CT_KEEP 0x0004 /* keep buffer (contains symbols) */ 61 #define CT_END 0x0008 /* last command of session, stop replying */ 62 63 /* index in macro array: macros only for these commands */ 64 #define CI_NONE (-1) 65 #define CI_CONN 0 66 #define CI_HELO 1 67 #define CI_MAIL 2 68 #define CI_RCPT 3 69 #define CI_DATA 4 70 #define CI_EOM 5 71 #define CI_EOH 6 72 #define CI_LAST CI_EOH 73 #if CI_LAST < CI_DATA 74 ERROR: do not compile with CI_LAST < CI_DATA 75 #endif 76 #if CI_LAST < CI_EOM 77 ERROR: do not compile with CI_LAST < CI_EOM 78 #endif 79 #if CI_LAST < CI_EOH 80 ERROR: do not compile with CI_LAST < CI_EOH 81 #endif 82 #if CI_LAST < CI_ENVRCPT 83 ERROR: do not compile with CI_LAST < CI_ENVRCPT 84 #endif 85 #if CI_LAST < CI_ENVFROM 86 ERROR: do not compile with CI_LAST < CI_ENVFROM 87 #endif 88 #if CI_LAST < CI_HELO 89 ERROR: do not compile with CI_LAST < CI_HELO 90 #endif 91 #if CI_LAST < CI_CONNECT 92 ERROR: do not compile with CI_LAST < CI_CONNECT 93 #endif 94 #if CI_LAST >= MAX_MACROS_ENTRIES 95 ERROR: do not compile with CI_LAST >= MAX_MACROS_ENTRIES 96 #endif 97 98 /* function prototypes */ 99 static int st_abortfct __P((genarg *)); 100 static int st_macros __P((genarg *)); 101 static int st_optionneg __P((genarg *)); 102 static int st_bodychunk __P((genarg *)); 103 static int st_connectinfo __P((genarg *)); 104 static int st_bodyend __P((genarg *)); 105 static int st_helo __P((genarg *)); 106 static int st_header __P((genarg *)); 107 static int st_sender __P((genarg *)); 108 static int st_rcpt __P((genarg *)); 109 static int st_unknown __P((genarg *)); 110 static int st_data __P((genarg *)); 111 static int st_eoh __P((genarg *)); 112 static int st_quit __P((genarg *)); 113 static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR)); 114 static void fix_stm __P((SMFICTX_PTR)); 115 static bool trans_ok __P((int, int)); 116 static char **dec_argv __P((char *, size_t)); 117 static int dec_arg2 __P((char *, size_t, char **, char **)); 118 119 #if _FFR_WORKERS_POOL 120 static bool mi_rd_socket_ready __P((int)); 121 #endif /* _FFR_WORKERS_POOL */ 122 123 /* states */ 124 #define ST_NONE (-1) 125 #define ST_INIT 0 /* initial state */ 126 #define ST_OPTS 1 /* option negotiation */ 127 #define ST_CONN 2 /* connection info */ 128 #define ST_HELO 3 /* helo */ 129 #define ST_MAIL 4 /* mail from */ 130 #define ST_RCPT 5 /* rcpt to */ 131 #define ST_DATA 6 /* data */ 132 #define ST_HDRS 7 /* headers */ 133 #define ST_EOHS 8 /* end of headers */ 134 #define ST_BODY 9 /* body */ 135 #define ST_ENDM 10 /* end of message */ 136 #define ST_QUIT 11 /* quit */ 137 #define ST_ABRT 12 /* abort */ 138 #define ST_UNKN 13 /* unknown SMTP command */ 139 #define ST_Q_NC 14 /* quit, new connection follows */ 140 #define ST_LAST ST_Q_NC /* last valid state */ 141 #define ST_SKIP 16 /* not a state but required for the state table */ 142 143 /* in a mail transaction? must be before eom according to spec. */ 144 #define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM) 145 146 /* 147 ** set of next states 148 ** each state (ST_*) corresponds to bit in an int value (1 << state) 149 ** each state has a set of allowed transitions ('or' of bits of states) 150 ** so a state transition is valid if the mask of the next state 151 ** is set in the NX_* value 152 ** this function is coded in trans_ok(), see below. 153 */ 154 155 #define MI_MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */ 156 #define NX_INIT (MI_MASK(ST_OPTS)) 157 #define NX_OPTS (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN)) 158 #define NX_CONN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN)) 159 #define NX_HELO (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN)) 160 #define NX_MAIL (MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN)) 161 #define NX_RCPT (MI_MASK(ST_HDRS) | MI_MASK(ST_EOHS) | MI_MASK(ST_DATA) | \ 162 MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | \ 163 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN)) 164 #define NX_DATA (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT)) 165 #define NX_HDRS (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT)) 166 #define NX_EOHS (MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | MI_MASK(ST_ABRT)) 167 #define NX_BODY (MI_MASK(ST_ENDM) | MI_MASK(ST_BODY) | MI_MASK(ST_ABRT)) 168 #define NX_ENDM (MI_MASK(ST_QUIT) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN) | \ 169 MI_MASK(ST_Q_NC)) 170 #define NX_QUIT 0 171 #define NX_ABRT 0 172 #define NX_UNKN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | \ 173 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | \ 174 MI_MASK(ST_DATA) | \ 175 MI_MASK(ST_BODY) | MI_MASK(ST_UNKN) | \ 176 MI_MASK(ST_ABRT) | MI_MASK(ST_QUIT) | MI_MASK(ST_Q_NC)) 177 #define NX_Q_NC (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN)) 178 #define NX_SKIP MI_MASK(ST_SKIP) 179 180 static int next_states[] = 181 { 182 NX_INIT 183 , NX_OPTS 184 , NX_CONN 185 , NX_HELO 186 , NX_MAIL 187 , NX_RCPT 188 , NX_DATA 189 , NX_HDRS 190 , NX_EOHS 191 , NX_BODY 192 , NX_ENDM 193 , NX_QUIT 194 , NX_ABRT 195 , NX_UNKN 196 , NX_Q_NC 197 }; 198 199 #define SIZE_NEXT_STATES (sizeof(next_states) / sizeof(next_states[0])) 200 201 /* commands received by milter */ 202 static cmdfct cmds[] = 203 { 204 {SMFIC_ABORT, CM_ARG0, ST_ABRT, CT_CONT, CI_NONE, st_abortfct } 205 , {SMFIC_MACRO, CM_ARGV, ST_NONE, CT_KEEP, CI_NONE, st_macros } 206 , {SMFIC_BODY, CM_ARG1, ST_BODY, CT_CONT, CI_NONE, st_bodychunk } 207 , {SMFIC_CONNECT, CM_ARG2, ST_CONN, CT_CONT, CI_CONN, st_connectinfo } 208 , {SMFIC_BODYEOB, CM_ARG1, ST_ENDM, CT_CONT, CI_EOM, st_bodyend } 209 , {SMFIC_HELO, CM_ARG1, ST_HELO, CT_CONT, CI_HELO, st_helo } 210 , {SMFIC_HEADER, CM_ARG2, ST_HDRS, CT_CONT, CI_NONE, st_header } 211 , {SMFIC_MAIL, CM_ARGV, ST_MAIL, CT_CONT, CI_MAIL, st_sender } 212 , {SMFIC_OPTNEG, CM_ARGO, ST_OPTS, CT_CONT, CI_NONE, st_optionneg } 213 , {SMFIC_EOH, CM_ARG0, ST_EOHS, CT_CONT, CI_EOH, st_eoh } 214 , {SMFIC_QUIT, CM_ARG0, ST_QUIT, CT_END, CI_NONE, st_quit } 215 , {SMFIC_DATA, CM_ARG0, ST_DATA, CT_CONT, CI_DATA, st_data } 216 , {SMFIC_RCPT, CM_ARGV, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt } 217 , {SMFIC_UNKNOWN, CM_ARG1, ST_UNKN, CT_IGNO, CI_NONE, st_unknown } 218 , {SMFIC_QUIT_NC, CM_ARG0, ST_Q_NC, CT_CONT, CI_NONE, st_quit } 219 }; 220 221 /* 222 ** Additional (internal) reply codes; 223 ** must be coordinated wit libmilter/mfapi.h 224 */ 225 226 #define _SMFIS_KEEP 20 227 #define _SMFIS_ABORT 21 228 #define _SMFIS_OPTIONS 22 229 #define _SMFIS_NOREPLY SMFIS_NOREPLY 230 #define _SMFIS_FAIL (-1) 231 #define _SMFIS_NONE (-2) 232 233 /* 234 ** MI_ENGINE -- receive commands and process them 235 ** 236 ** Parameters: 237 ** ctx -- context structure 238 ** 239 ** Returns: 240 ** MI_FAILURE/MI_SUCCESS 241 */ 242 243 int 244 mi_engine(ctx) 245 SMFICTX_PTR ctx; 246 { 247 size_t len; 248 int i; 249 socket_t sd; 250 int ret = MI_SUCCESS; 251 int ncmds = sizeof(cmds) / sizeof(cmdfct); 252 int curstate = ST_INIT; 253 int newstate; 254 bool call_abort; 255 sfsistat r; 256 char cmd; 257 char *buf = NULL; 258 genarg arg; 259 struct timeval timeout; 260 int (*f) __P((genarg *)); 261 sfsistat (*fi_abort) __P((SMFICTX *)); 262 sfsistat (*fi_close) __P((SMFICTX *)); 263 264 arg.a_ctx = ctx; 265 sd = ctx->ctx_sd; 266 fi_abort = ctx->ctx_smfi->xxfi_abort; 267 #if _FFR_WORKERS_POOL 268 curstate = ctx->ctx_state; 269 if (curstate == ST_INIT) 270 { 271 mi_clr_macros(ctx, 0); 272 fix_stm(ctx); 273 } 274 #else /* _FFR_WORKERS_POOL */ 275 mi_clr_macros(ctx, 0); 276 fix_stm(ctx); 277 #endif /* _FFR_WORKERS_POOL */ 278 r = _SMFIS_NONE; 279 do 280 { 281 /* call abort only if in a mail transaction */ 282 call_abort = ST_IN_MAIL(curstate); 283 timeout.tv_sec = ctx->ctx_timeout; 284 timeout.tv_usec = 0; 285 if (mi_stop() == MILTER_ABRT) 286 { 287 if (ctx->ctx_dbg > 3) 288 sm_dprintf("[%ld] milter_abort\n", 289 (long) ctx->ctx_id); 290 ret = MI_FAILURE; 291 break; 292 } 293 294 /* 295 ** Notice: buf is allocated by mi_rd_cmd() and it will 296 ** usually be free()d after it has been used in f(). 297 ** However, if the function returns _SMFIS_KEEP then buf 298 ** contains macros and will not be free()d. 299 ** Hence r must be set to _SMFIS_NONE if a new buf is 300 ** allocated to avoid problem with housekeeping, esp. 301 ** if the code "break"s out of the loop. 302 */ 303 304 #if _FFR_WORKERS_POOL 305 /* Is the socket ready to be read ??? */ 306 if (!mi_rd_socket_ready(sd)) 307 { 308 ret = MI_CONTINUE; 309 break; 310 } 311 #endif /* _FFR_WORKERS_POOL */ 312 313 r = _SMFIS_NONE; 314 if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len, 315 ctx->ctx_smfi->xxfi_name)) == NULL && 316 cmd < SMFIC_VALIDCMD) 317 { 318 if (ctx->ctx_dbg > 5) 319 sm_dprintf("[%ld] mi_engine: mi_rd_cmd error (%x)\n", 320 (long) ctx->ctx_id, (int) cmd); 321 322 /* 323 ** eof is currently treated as failure -> 324 ** abort() instead of close(), otherwise use: 325 ** if (cmd != SMFIC_EOF) 326 */ 327 328 ret = MI_FAILURE; 329 break; 330 } 331 if (ctx->ctx_dbg > 4) 332 sm_dprintf("[%ld] got cmd '%c' len %d\n", 333 (long) ctx->ctx_id, cmd, (int) len); 334 for (i = 0; i < ncmds; i++) 335 { 336 if (cmd == cmds[i].cm_cmd) 337 break; 338 } 339 if (i >= ncmds) 340 { 341 /* unknown command */ 342 if (ctx->ctx_dbg > 1) 343 sm_dprintf("[%ld] cmd '%c' unknown\n", 344 (long) ctx->ctx_id, cmd); 345 ret = MI_FAILURE; 346 break; 347 } 348 if ((f = cmds[i].cm_fct) == NULL) 349 { 350 /* stop for now */ 351 if (ctx->ctx_dbg > 1) 352 sm_dprintf("[%ld] cmd '%c' not impl\n", 353 (long) ctx->ctx_id, cmd); 354 ret = MI_FAILURE; 355 break; 356 } 357 358 /* is new state ok? */ 359 newstate = cmds[i].cm_next; 360 if (ctx->ctx_dbg > 5) 361 sm_dprintf("[%ld] cur %x new %x nextmask %x\n", 362 (long) ctx->ctx_id, 363 curstate, newstate, next_states[curstate]); 364 365 if (newstate != ST_NONE && !trans_ok(curstate, newstate)) 366 { 367 if (ctx->ctx_dbg > 1) 368 sm_dprintf("[%ld] abort: cur %d (%x) new %d (%x) next %x\n", 369 (long) ctx->ctx_id, 370 curstate, MI_MASK(curstate), 371 newstate, MI_MASK(newstate), 372 next_states[curstate]); 373 374 /* call abort only if in a mail transaction */ 375 if (fi_abort != NULL && call_abort) 376 (void) (*fi_abort)(ctx); 377 378 /* 379 ** try to reach the new state from HELO 380 ** if it can't be reached, ignore the command. 381 */ 382 383 curstate = ST_HELO; 384 if (!trans_ok(curstate, newstate)) 385 { 386 if (buf != NULL) 387 { 388 free(buf); 389 buf = NULL; 390 } 391 continue; 392 } 393 } 394 arg.a_len = len; 395 arg.a_buf = buf; 396 if (newstate != ST_NONE) 397 { 398 curstate = newstate; 399 ctx->ctx_state = curstate; 400 } 401 arg.a_idx = cmds[i].cm_macros; 402 call_abort = ST_IN_MAIL(curstate); 403 404 /* call function to deal with command */ 405 MI_MONITOR_BEGIN(ctx, cmd); 406 r = (*f)(&arg); 407 MI_MONITOR_END(ctx, cmd); 408 if (r != _SMFIS_KEEP && buf != NULL) 409 { 410 free(buf); 411 buf = NULL; 412 } 413 if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS) 414 { 415 ret = MI_FAILURE; 416 break; 417 } 418 419 if (r == SMFIS_ACCEPT) 420 { 421 /* accept mail, no further actions taken */ 422 curstate = ST_HELO; 423 } 424 else if (r == SMFIS_REJECT || r == SMFIS_DISCARD || 425 r == SMFIS_TEMPFAIL) 426 { 427 /* 428 ** further actions depend on current state 429 ** if the IGNO bit is set: "ignore" the error, 430 ** i.e., stay in the current state 431 */ 432 if (!bitset(CT_IGNO, cmds[i].cm_todo)) 433 curstate = ST_HELO; 434 } 435 else if (r == _SMFIS_ABORT) 436 { 437 if (ctx->ctx_dbg > 5) 438 sm_dprintf("[%ld] function returned abort\n", 439 (long) ctx->ctx_id); 440 ret = MI_FAILURE; 441 break; 442 } 443 } while (!bitset(CT_END, cmds[i].cm_todo)); 444 445 ctx->ctx_state = curstate; 446 447 if (ret == MI_FAILURE) 448 { 449 /* call abort only if in a mail transaction */ 450 if (fi_abort != NULL && call_abort) 451 (void) (*fi_abort)(ctx); 452 } 453 454 /* has close been called? */ 455 if (ctx->ctx_state != ST_QUIT 456 #if _FFR_WORKERS_POOL 457 && ret != MI_CONTINUE 458 #endif /* _FFR_WORKERS_POOL */ 459 ) 460 { 461 if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL) 462 (void) (*fi_close)(ctx); 463 } 464 if (r != _SMFIS_KEEP && buf != NULL) 465 free(buf); 466 #if !_FFR_WORKERS_POOL 467 mi_clr_macros(ctx, 0); 468 #endif /* _FFR_WORKERS_POOL */ 469 return ret; 470 } 471 472 static size_t milter_addsymlist __P((SMFICTX_PTR, char *, char **)); 473 474 static size_t 475 milter_addsymlist(ctx, buf, newbuf) 476 SMFICTX_PTR ctx; 477 char *buf; 478 char **newbuf; 479 { 480 size_t len; 481 int i; 482 mi_int32 v; 483 char *buffer; 484 485 SM_ASSERT(ctx != NULL); 486 SM_ASSERT(buf != NULL); 487 SM_ASSERT(newbuf != NULL); 488 len = 0; 489 for (i = 0; i < MAX_MACROS_ENTRIES; i++) 490 { 491 if (ctx->ctx_mac_list[i] != NULL) 492 { 493 len += strlen(ctx->ctx_mac_list[i]) + 1 + 494 MILTER_LEN_BYTES; 495 } 496 } 497 if (len > 0) 498 { 499 size_t offset; 500 501 SM_ASSERT(len + MILTER_OPTLEN > len); 502 len += MILTER_OPTLEN; 503 buffer = malloc(len); 504 if (buffer != NULL) 505 { 506 (void) memcpy(buffer, buf, MILTER_OPTLEN); 507 offset = MILTER_OPTLEN; 508 for (i = 0; i < MAX_MACROS_ENTRIES; i++) 509 { 510 size_t l; 511 512 if (ctx->ctx_mac_list[i] == NULL) 513 continue; 514 515 SM_ASSERT(offset + MILTER_LEN_BYTES < len); 516 v = htonl(i); 517 (void) memcpy(buffer + offset, (void *) &v, 518 MILTER_LEN_BYTES); 519 offset += MILTER_LEN_BYTES; 520 l = strlen(ctx->ctx_mac_list[i]) + 1; 521 SM_ASSERT(offset + l <= len); 522 (void) memcpy(buffer + offset, 523 ctx->ctx_mac_list[i], l); 524 offset += l; 525 } 526 } 527 else 528 { 529 /* oops ... */ 530 } 531 } 532 else 533 { 534 len = MILTER_OPTLEN; 535 buffer = buf; 536 } 537 *newbuf = buffer; 538 return len; 539 } 540 541 /* 542 ** GET_NR_BIT -- get "no reply" bit matching state 543 ** 544 ** Parameters: 545 ** state -- current protocol stage 546 ** 547 ** Returns: 548 ** 0: no matching bit 549 ** >0: the matching "no reply" bit 550 */ 551 552 static unsigned long get_nr_bit __P((int)); 553 554 static unsigned long 555 get_nr_bit(state) 556 int state; 557 { 558 unsigned long bit; 559 560 switch (state) 561 { 562 case ST_CONN: 563 bit = SMFIP_NR_CONN; 564 break; 565 case ST_HELO: 566 bit = SMFIP_NR_HELO; 567 break; 568 case ST_MAIL: 569 bit = SMFIP_NR_MAIL; 570 break; 571 case ST_RCPT: 572 bit = SMFIP_NR_RCPT; 573 break; 574 case ST_DATA: 575 bit = SMFIP_NR_DATA; 576 break; 577 case ST_UNKN: 578 bit = SMFIP_NR_UNKN; 579 break; 580 case ST_HDRS: 581 bit = SMFIP_NR_HDR; 582 break; 583 case ST_EOHS: 584 bit = SMFIP_NR_EOH; 585 break; 586 case ST_BODY: 587 bit = SMFIP_NR_BODY; 588 break; 589 default: 590 bit = 0; 591 break; 592 } 593 return bit; 594 } 595 596 /* 597 ** SENDREPLY -- send a reply to the MTA 598 ** 599 ** Parameters: 600 ** r -- reply code 601 ** sd -- socket descriptor 602 ** timeout_ptr -- (ptr to) timeout to use for sending 603 ** ctx -- context structure 604 ** 605 ** Returns: 606 ** MI_SUCCESS/MI_FAILURE 607 */ 608 609 static int 610 sendreply(r, sd, timeout_ptr, ctx) 611 sfsistat r; 612 socket_t sd; 613 struct timeval *timeout_ptr; 614 SMFICTX_PTR ctx; 615 { 616 int ret; 617 unsigned long bit; 618 619 ret = MI_SUCCESS; 620 621 bit = get_nr_bit(ctx->ctx_state); 622 if (bit != 0 && (ctx->ctx_pflags & bit) != 0 && r != SMFIS_NOREPLY) 623 { 624 if (r >= SMFIS_CONTINUE && r < _SMFIS_KEEP) 625 { 626 /* milter said it wouldn't reply, but it lied... */ 627 smi_log(SMI_LOG_ERR, 628 "%s: milter claimed not to reply in state %d but did anyway %d\n", 629 ctx->ctx_smfi->xxfi_name, 630 ctx->ctx_state, r); 631 632 } 633 634 /* 635 ** Force specified behavior, otherwise libmilter 636 ** and MTA will fail to communicate properly. 637 */ 638 639 switch (r) 640 { 641 case SMFIS_CONTINUE: 642 case SMFIS_TEMPFAIL: 643 case SMFIS_REJECT: 644 case SMFIS_DISCARD: 645 case SMFIS_ACCEPT: 646 case SMFIS_SKIP: 647 case _SMFIS_OPTIONS: 648 r = SMFIS_NOREPLY; 649 break; 650 } 651 } 652 653 switch (r) 654 { 655 case SMFIS_CONTINUE: 656 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 0); 657 break; 658 case SMFIS_TEMPFAIL: 659 case SMFIS_REJECT: 660 if (ctx->ctx_reply != NULL && 661 ((r == SMFIS_TEMPFAIL && *ctx->ctx_reply == '4') || 662 (r == SMFIS_REJECT && *ctx->ctx_reply == '5'))) 663 { 664 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_REPLYCODE, 665 ctx->ctx_reply, 666 strlen(ctx->ctx_reply) + 1); 667 free(ctx->ctx_reply); 668 ctx->ctx_reply = NULL; 669 } 670 else 671 { 672 ret = mi_wr_cmd(sd, timeout_ptr, r == SMFIS_REJECT ? 673 SMFIR_REJECT : SMFIR_TEMPFAIL, NULL, 0); 674 } 675 break; 676 case SMFIS_DISCARD: 677 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_DISCARD, NULL, 0); 678 break; 679 case SMFIS_ACCEPT: 680 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_ACCEPT, NULL, 0); 681 break; 682 case SMFIS_SKIP: 683 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_SKIP, NULL, 0); 684 break; 685 case _SMFIS_OPTIONS: 686 { 687 mi_int32 v; 688 size_t len; 689 char *buffer; 690 char buf[MILTER_OPTLEN]; 691 692 v = htonl(ctx->ctx_prot_vers2mta); 693 (void) memcpy(&(buf[0]), (void *) &v, 694 MILTER_LEN_BYTES); 695 v = htonl(ctx->ctx_aflags); 696 (void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v, 697 MILTER_LEN_BYTES); 698 v = htonl(ctx->ctx_pflags2mta); 699 (void) memcpy(&(buf[MILTER_LEN_BYTES * 2]), 700 (void *) &v, MILTER_LEN_BYTES); 701 len = milter_addsymlist(ctx, buf, &buffer); 702 if (buffer != NULL) 703 ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG, 704 buffer, len); 705 else 706 ret = MI_FAILURE; 707 } 708 break; 709 case SMFIS_NOREPLY: 710 if (bit != 0 && 711 (ctx->ctx_pflags & bit) != 0 && 712 (ctx->ctx_mta_pflags & bit) == 0) 713 { 714 /* 715 ** milter doesn't want to send a reply, 716 ** but the MTA doesn't have that feature: fake it. 717 */ 718 719 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 720 0); 721 } 722 break; 723 default: /* don't send a reply */ 724 break; 725 } 726 return ret; 727 } 728 729 /* 730 ** CLR_MACROS -- clear set of macros starting from a given index 731 ** 732 ** Parameters: 733 ** ctx -- context structure 734 ** m -- index from which to clear all macros 735 ** 736 ** Returns: 737 ** None. 738 */ 739 740 void 741 mi_clr_macros(ctx, m) 742 SMFICTX_PTR ctx; 743 int m; 744 { 745 int i; 746 747 for (i = m; i < MAX_MACROS_ENTRIES; i++) 748 { 749 if (ctx->ctx_mac_ptr[i] != NULL) 750 { 751 free(ctx->ctx_mac_ptr[i]); 752 ctx->ctx_mac_ptr[i] = NULL; 753 } 754 if (ctx->ctx_mac_buf[i] != NULL) 755 { 756 free(ctx->ctx_mac_buf[i]); 757 ctx->ctx_mac_buf[i] = NULL; 758 } 759 } 760 } 761 762 /* 763 ** ST_OPTIONNEG -- negotiate options 764 ** 765 ** Parameters: 766 ** g -- generic argument structure 767 ** 768 ** Returns: 769 ** abort/send options/continue 770 */ 771 772 static int 773 st_optionneg(g) 774 genarg *g; 775 { 776 mi_int32 i, v, fake_pflags; 777 SMFICTX_PTR ctx; 778 int (*fi_negotiate) __P((SMFICTX *, 779 unsigned long, unsigned long, 780 unsigned long, unsigned long, 781 unsigned long *, unsigned long *, 782 unsigned long *, unsigned long *)); 783 784 if (g == NULL || g->a_ctx->ctx_smfi == NULL) 785 return SMFIS_CONTINUE; 786 ctx = g->a_ctx; 787 mi_clr_macros(ctx, g->a_idx + 1); 788 ctx->ctx_prot_vers = SMFI_PROT_VERSION; 789 790 /* check for minimum length */ 791 if (g->a_len < MILTER_OPTLEN) 792 { 793 smi_log(SMI_LOG_ERR, 794 "%s: st_optionneg[%ld]: len too short %d < %d", 795 ctx->ctx_smfi->xxfi_name, 796 (long) ctx->ctx_id, (int) g->a_len, 797 MILTER_OPTLEN); 798 return _SMFIS_ABORT; 799 } 800 801 /* protocol version */ 802 (void) memcpy((void *) &i, (void *) &(g->a_buf[0]), MILTER_LEN_BYTES); 803 v = ntohl(i); 804 805 #define SMFI_PROT_VERSION_MIN 2 806 807 /* check for minimum version */ 808 if (v < SMFI_PROT_VERSION_MIN) 809 { 810 smi_log(SMI_LOG_ERR, 811 "%s: st_optionneg[%ld]: protocol version too old %d < %d", 812 ctx->ctx_smfi->xxfi_name, 813 (long) ctx->ctx_id, v, SMFI_PROT_VERSION_MIN); 814 return _SMFIS_ABORT; 815 } 816 ctx->ctx_mta_prot_vers = v; 817 if (ctx->ctx_prot_vers < ctx->ctx_mta_prot_vers) 818 ctx->ctx_prot_vers2mta = ctx->ctx_prot_vers; 819 else 820 ctx->ctx_prot_vers2mta = ctx->ctx_mta_prot_vers; 821 822 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES]), 823 MILTER_LEN_BYTES); 824 v = ntohl(i); 825 826 /* no flags? set to default value for V1 actions */ 827 if (v == 0) 828 v = SMFI_V1_ACTS; 829 ctx->ctx_mta_aflags = v; /* MTA action flags */ 830 831 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES * 2]), 832 MILTER_LEN_BYTES); 833 v = ntohl(i); 834 835 /* no flags? set to default value for V1 protocol */ 836 if (v == 0) 837 v = SMFI_V1_PROT; 838 ctx->ctx_mta_pflags = v; /* MTA protocol flags */ 839 840 /* 841 ** Copy flags from milter struct into libmilter context; 842 ** this variable will be used later on to check whether 843 ** the MTA "actions" can fulfill the milter requirements, 844 ** but it may be overwritten by the negotiate callback. 845 */ 846 847 ctx->ctx_aflags = ctx->ctx_smfi->xxfi_flags; 848 fake_pflags = SMFIP_NR_CONN 849 |SMFIP_NR_HELO 850 |SMFIP_NR_MAIL 851 |SMFIP_NR_RCPT 852 |SMFIP_NR_DATA 853 |SMFIP_NR_UNKN 854 |SMFIP_NR_HDR 855 |SMFIP_NR_EOH 856 |SMFIP_NR_BODY 857 ; 858 859 if (g->a_ctx->ctx_smfi != NULL && 860 g->a_ctx->ctx_smfi->xxfi_version > 4 && 861 (fi_negotiate = g->a_ctx->ctx_smfi->xxfi_negotiate) != NULL) 862 { 863 int r; 864 unsigned long m_aflags, m_pflags, m_f2, m_f3; 865 866 /* 867 ** let milter decide whether the features offered by the 868 ** MTA are "good enough". 869 ** Notes: 870 ** - libmilter can "fake" some features (e.g., SMFIP_NR_HDR) 871 ** - m_f2, m_f3 are for future extensions 872 */ 873 874 m_f2 = m_f3 = 0; 875 m_aflags = ctx->ctx_mta_aflags; 876 m_pflags = ctx->ctx_pflags; 877 if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0) 878 m_pflags |= SMFIP_SKIP; 879 r = fi_negotiate(g->a_ctx, 880 ctx->ctx_mta_aflags, 881 ctx->ctx_mta_pflags|fake_pflags, 882 0, 0, 883 &m_aflags, &m_pflags, &m_f2, &m_f3); 884 885 /* 886 ** Types of protocol flags (pflags): 887 ** 1. do NOT send protocol step X 888 ** 2. MTA can do/understand something extra (SKIP, 889 ** send unknown RCPTs) 890 ** 3. MTA can deal with "no reply" for various protocol steps 891 ** Note: this mean that it isn't possible to simply set all 892 ** flags to get "everything": 893 ** setting a flag of type 1 turns off a step 894 ** (it should be the other way around: 895 ** a flag means a protocol step can be sent) 896 ** setting a flag of type 3 requires that milter 897 ** never sends a reply for the corresponding step. 898 ** Summary: the "negation" of protocol flags is causing 899 ** problems, but at least for type 3 there is no simple 900 ** solution. 901 ** 902 ** What should "all options" mean? 903 ** send all protocol steps _except_ those for which there is 904 ** no callback (currently registered in ctx_pflags) 905 ** expect SKIP as return code? Yes 906 ** send unknown RCPTs? No, 907 ** must be explicitly requested? 908 ** "no reply" for some protocol steps? No, 909 ** must be explicitly requested. 910 */ 911 912 if (SMFIS_ALL_OPTS == r) 913 { 914 ctx->ctx_aflags = ctx->ctx_mta_aflags; 915 ctx->ctx_pflags2mta = ctx->ctx_pflags; 916 if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0) 917 ctx->ctx_pflags2mta |= SMFIP_SKIP; 918 } 919 else if (r != SMFIS_CONTINUE) 920 { 921 smi_log(SMI_LOG_ERR, 922 "%s: st_optionneg[%ld]: xxfi_negotiate returned %d (protocol options=0x%lx, actions=0x%lx)", 923 ctx->ctx_smfi->xxfi_name, 924 (long) ctx->ctx_id, r, ctx->ctx_mta_pflags, 925 ctx->ctx_mta_aflags); 926 return _SMFIS_ABORT; 927 } 928 else 929 { 930 ctx->ctx_aflags = m_aflags; 931 ctx->ctx_pflags = m_pflags; 932 ctx->ctx_pflags2mta = m_pflags; 933 } 934 935 /* check whether some flags need to be "faked" */ 936 i = ctx->ctx_pflags2mta; 937 if ((ctx->ctx_mta_pflags & i) != i) 938 { 939 unsigned int idx; 940 unsigned long b; 941 942 /* 943 ** If some behavior can be faked (set in fake_pflags), 944 ** but the MTA doesn't support it, then unset 945 ** that flag in the value that is sent to the MTA. 946 */ 947 948 for (idx = 0; idx < 32; idx++) 949 { 950 b = 1 << idx; 951 if ((ctx->ctx_mta_pflags & b) != b && 952 (fake_pflags & b) == b) 953 ctx->ctx_pflags2mta &= ~b; 954 } 955 } 956 } 957 else 958 { 959 /* 960 ** Set the protocol flags based on the values determined 961 ** in mi_listener() which checked the defined callbacks. 962 */ 963 964 ctx->ctx_pflags2mta = ctx->ctx_pflags; 965 } 966 967 /* check whether actions and protocol requirements can be satisfied */ 968 i = ctx->ctx_aflags; 969 if ((i & ctx->ctx_mta_aflags) != i) 970 { 971 smi_log(SMI_LOG_ERR, 972 "%s: st_optionneg[%ld]: 0x%lx does not fulfill action requirements 0x%x", 973 ctx->ctx_smfi->xxfi_name, 974 (long) ctx->ctx_id, ctx->ctx_mta_aflags, i); 975 return _SMFIS_ABORT; 976 } 977 978 i = ctx->ctx_pflags2mta; 979 if ((ctx->ctx_mta_pflags & i) != i) 980 { 981 /* 982 ** Older MTAs do not support some protocol steps. 983 ** As this protocol is a bit "wierd" (it asks for steps 984 ** NOT to be taken/sent) we have to check whether we 985 ** should turn off those "negative" requests. 986 ** Currently these are only SMFIP_NODATA and SMFIP_NOUNKNOWN. 987 */ 988 989 if (bitset(SMFIP_NODATA, ctx->ctx_pflags2mta) && 990 !bitset(SMFIP_NODATA, ctx->ctx_mta_pflags)) 991 ctx->ctx_pflags2mta &= ~SMFIP_NODATA; 992 if (bitset(SMFIP_NOUNKNOWN, ctx->ctx_pflags2mta) && 993 !bitset(SMFIP_NOUNKNOWN, ctx->ctx_mta_pflags)) 994 ctx->ctx_pflags2mta &= ~SMFIP_NOUNKNOWN; 995 i = ctx->ctx_pflags2mta; 996 } 997 998 if ((ctx->ctx_mta_pflags & i) != i) 999 { 1000 smi_log(SMI_LOG_ERR, 1001 "%s: st_optionneg[%ld]: 0x%lx does not fulfill protocol requirements 0x%x", 1002 ctx->ctx_smfi->xxfi_name, 1003 (long) ctx->ctx_id, ctx->ctx_mta_pflags, i); 1004 return _SMFIS_ABORT; 1005 } 1006 1007 if (ctx->ctx_dbg > 3) 1008 sm_dprintf("[%ld] milter_negotiate:" 1009 " mta_actions=0x%lx, mta_flags=0x%lx" 1010 " actions=0x%lx, flags=0x%lx\n" 1011 , (long) ctx->ctx_id 1012 , ctx->ctx_mta_aflags, ctx->ctx_mta_pflags 1013 , ctx->ctx_aflags, ctx->ctx_pflags); 1014 1015 return _SMFIS_OPTIONS; 1016 } 1017 1018 /* 1019 ** ST_CONNECTINFO -- receive connection information 1020 ** 1021 ** Parameters: 1022 ** g -- generic argument structure 1023 ** 1024 ** Returns: 1025 ** continue or filter-specified value 1026 */ 1027 1028 static int 1029 st_connectinfo(g) 1030 genarg *g; 1031 { 1032 size_t l; 1033 size_t i; 1034 char *s, family; 1035 unsigned short port = 0; 1036 _SOCK_ADDR sockaddr; 1037 sfsistat (*fi_connect) __P((SMFICTX *, char *, _SOCK_ADDR *)); 1038 1039 if (g == NULL) 1040 return _SMFIS_ABORT; 1041 mi_clr_macros(g->a_ctx, g->a_idx + 1); 1042 if (g->a_ctx->ctx_smfi == NULL || 1043 (fi_connect = g->a_ctx->ctx_smfi->xxfi_connect) == NULL) 1044 return SMFIS_CONTINUE; 1045 1046 s = g->a_buf; 1047 i = 0; 1048 l = g->a_len; 1049 while (s[i] != '\0' && i <= l) 1050 ++i; 1051 if (i + 1 >= l) 1052 return _SMFIS_ABORT; 1053 1054 /* Move past trailing \0 in host string */ 1055 i++; 1056 family = s[i++]; 1057 (void) memset(&sockaddr, '\0', sizeof sockaddr); 1058 if (family != SMFIA_UNKNOWN) 1059 { 1060 if (i + sizeof port >= l) 1061 { 1062 smi_log(SMI_LOG_ERR, 1063 "%s: connect[%ld]: wrong len %d >= %d", 1064 g->a_ctx->ctx_smfi->xxfi_name, 1065 (long) g->a_ctx->ctx_id, (int) i, (int) l); 1066 return _SMFIS_ABORT; 1067 } 1068 (void) memcpy((void *) &port, (void *) (s + i), 1069 sizeof port); 1070 i += sizeof port; 1071 1072 /* make sure string is terminated */ 1073 if (s[l - 1] != '\0') 1074 return _SMFIS_ABORT; 1075 # if NETINET 1076 if (family == SMFIA_INET) 1077 { 1078 if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr) 1079 != 1) 1080 { 1081 smi_log(SMI_LOG_ERR, 1082 "%s: connect[%ld]: inet_aton failed", 1083 g->a_ctx->ctx_smfi->xxfi_name, 1084 (long) g->a_ctx->ctx_id); 1085 return _SMFIS_ABORT; 1086 } 1087 sockaddr.sa.sa_family = AF_INET; 1088 if (port > 0) 1089 sockaddr.sin.sin_port = port; 1090 } 1091 else 1092 # endif /* NETINET */ 1093 # if NETINET6 1094 if (family == SMFIA_INET6) 1095 { 1096 if (mi_inet_pton(AF_INET6, s + i, 1097 &sockaddr.sin6.sin6_addr) != 1) 1098 { 1099 smi_log(SMI_LOG_ERR, 1100 "%s: connect[%ld]: mi_inet_pton failed", 1101 g->a_ctx->ctx_smfi->xxfi_name, 1102 (long) g->a_ctx->ctx_id); 1103 return _SMFIS_ABORT; 1104 } 1105 sockaddr.sa.sa_family = AF_INET6; 1106 if (port > 0) 1107 sockaddr.sin6.sin6_port = port; 1108 } 1109 else 1110 # endif /* NETINET6 */ 1111 # if NETUNIX 1112 if (family == SMFIA_UNIX) 1113 { 1114 if (sm_strlcpy(sockaddr.sunix.sun_path, s + i, 1115 sizeof sockaddr.sunix.sun_path) >= 1116 sizeof sockaddr.sunix.sun_path) 1117 { 1118 smi_log(SMI_LOG_ERR, 1119 "%s: connect[%ld]: path too long", 1120 g->a_ctx->ctx_smfi->xxfi_name, 1121 (long) g->a_ctx->ctx_id); 1122 return _SMFIS_ABORT; 1123 } 1124 sockaddr.sunix.sun_family = AF_UNIX; 1125 } 1126 else 1127 # endif /* NETUNIX */ 1128 { 1129 smi_log(SMI_LOG_ERR, 1130 "%s: connect[%ld]: unknown family %d", 1131 g->a_ctx->ctx_smfi->xxfi_name, 1132 (long) g->a_ctx->ctx_id, family); 1133 return _SMFIS_ABORT; 1134 } 1135 } 1136 return (*fi_connect)(g->a_ctx, g->a_buf, 1137 family != SMFIA_UNKNOWN ? &sockaddr : NULL); 1138 } 1139 1140 /* 1141 ** ST_EOH -- end of headers 1142 ** 1143 ** Parameters: 1144 ** g -- generic argument structure 1145 ** 1146 ** Returns: 1147 ** continue or filter-specified value 1148 */ 1149 1150 static int 1151 st_eoh(g) 1152 genarg *g; 1153 { 1154 sfsistat (*fi_eoh) __P((SMFICTX *)); 1155 1156 if (g == NULL) 1157 return _SMFIS_ABORT; 1158 if (g->a_ctx->ctx_smfi != NULL && 1159 (fi_eoh = g->a_ctx->ctx_smfi->xxfi_eoh) != NULL) 1160 return (*fi_eoh)(g->a_ctx); 1161 return SMFIS_CONTINUE; 1162 } 1163 1164 /* 1165 ** ST_DATA -- DATA command 1166 ** 1167 ** Parameters: 1168 ** g -- generic argument structure 1169 ** 1170 ** Returns: 1171 ** continue or filter-specified value 1172 */ 1173 1174 static int 1175 st_data(g) 1176 genarg *g; 1177 { 1178 sfsistat (*fi_data) __P((SMFICTX *)); 1179 1180 if (g == NULL) 1181 return _SMFIS_ABORT; 1182 if (g->a_ctx->ctx_smfi != NULL && 1183 g->a_ctx->ctx_smfi->xxfi_version > 3 && 1184 (fi_data = g->a_ctx->ctx_smfi->xxfi_data) != NULL) 1185 return (*fi_data)(g->a_ctx); 1186 return SMFIS_CONTINUE; 1187 } 1188 1189 /* 1190 ** ST_HELO -- helo/ehlo command 1191 ** 1192 ** Parameters: 1193 ** g -- generic argument structure 1194 ** 1195 ** Returns: 1196 ** continue or filter-specified value 1197 */ 1198 1199 static int 1200 st_helo(g) 1201 genarg *g; 1202 { 1203 sfsistat (*fi_helo) __P((SMFICTX *, char *)); 1204 1205 if (g == NULL) 1206 return _SMFIS_ABORT; 1207 mi_clr_macros(g->a_ctx, g->a_idx + 1); 1208 if (g->a_ctx->ctx_smfi != NULL && 1209 (fi_helo = g->a_ctx->ctx_smfi->xxfi_helo) != NULL) 1210 { 1211 /* paranoia: check for terminating '\0' */ 1212 if (g->a_len == 0 || g->a_buf[g->a_len - 1] != '\0') 1213 return MI_FAILURE; 1214 return (*fi_helo)(g->a_ctx, g->a_buf); 1215 } 1216 return SMFIS_CONTINUE; 1217 } 1218 1219 /* 1220 ** ST_HEADER -- header line 1221 ** 1222 ** Parameters: 1223 ** g -- generic argument structure 1224 ** 1225 ** Returns: 1226 ** continue or filter-specified value 1227 */ 1228 1229 static int 1230 st_header(g) 1231 genarg *g; 1232 { 1233 char *hf, *hv; 1234 sfsistat (*fi_header) __P((SMFICTX *, char *, char *)); 1235 1236 if (g == NULL) 1237 return _SMFIS_ABORT; 1238 if (g->a_ctx->ctx_smfi == NULL || 1239 (fi_header = g->a_ctx->ctx_smfi->xxfi_header) == NULL) 1240 return SMFIS_CONTINUE; 1241 if (dec_arg2(g->a_buf, g->a_len, &hf, &hv) == MI_SUCCESS) 1242 return (*fi_header)(g->a_ctx, hf, hv); 1243 else 1244 return _SMFIS_ABORT; 1245 } 1246 1247 #define ARGV_FCT(lf, rf, idx) \ 1248 char **argv; \ 1249 sfsistat (*lf) __P((SMFICTX *, char **)); \ 1250 int r; \ 1251 \ 1252 if (g == NULL) \ 1253 return _SMFIS_ABORT; \ 1254 mi_clr_macros(g->a_ctx, g->a_idx + 1); \ 1255 if (g->a_ctx->ctx_smfi == NULL || \ 1256 (lf = g->a_ctx->ctx_smfi->rf) == NULL) \ 1257 return SMFIS_CONTINUE; \ 1258 if ((argv = dec_argv(g->a_buf, g->a_len)) == NULL) \ 1259 return _SMFIS_ABORT; \ 1260 r = (*lf)(g->a_ctx, argv); \ 1261 free(argv); \ 1262 return r; 1263 1264 /* 1265 ** ST_SENDER -- MAIL FROM command 1266 ** 1267 ** Parameters: 1268 ** g -- generic argument structure 1269 ** 1270 ** Returns: 1271 ** continue or filter-specified value 1272 */ 1273 1274 static int 1275 st_sender(g) 1276 genarg *g; 1277 { 1278 ARGV_FCT(fi_envfrom, xxfi_envfrom, CI_MAIL) 1279 } 1280 1281 /* 1282 ** ST_RCPT -- RCPT TO command 1283 ** 1284 ** Parameters: 1285 ** g -- generic argument structure 1286 ** 1287 ** Returns: 1288 ** continue or filter-specified value 1289 */ 1290 1291 static int 1292 st_rcpt(g) 1293 genarg *g; 1294 { 1295 ARGV_FCT(fi_envrcpt, xxfi_envrcpt, CI_RCPT) 1296 } 1297 1298 /* 1299 ** ST_UNKNOWN -- unrecognized or unimplemented command 1300 ** 1301 ** Parameters: 1302 ** g -- generic argument structure 1303 ** 1304 ** Returns: 1305 ** continue or filter-specified value 1306 */ 1307 1308 static int 1309 st_unknown(g) 1310 genarg *g; 1311 { 1312 sfsistat (*fi_unknown) __P((SMFICTX *, const char *)); 1313 1314 if (g == NULL) 1315 return _SMFIS_ABORT; 1316 if (g->a_ctx->ctx_smfi != NULL && 1317 g->a_ctx->ctx_smfi->xxfi_version > 2 && 1318 (fi_unknown = g->a_ctx->ctx_smfi->xxfi_unknown) != NULL) 1319 return (*fi_unknown)(g->a_ctx, (const char *) g->a_buf); 1320 return SMFIS_CONTINUE; 1321 } 1322 1323 /* 1324 ** ST_MACROS -- deal with macros received from the MTA 1325 ** 1326 ** Parameters: 1327 ** g -- generic argument structure 1328 ** 1329 ** Returns: 1330 ** continue/keep 1331 ** 1332 ** Side effects: 1333 ** set pointer in macro array to current values. 1334 */ 1335 1336 static int 1337 st_macros(g) 1338 genarg *g; 1339 { 1340 int i; 1341 char **argv; 1342 1343 if (g == NULL || g->a_len < 1) 1344 return _SMFIS_FAIL; 1345 if ((argv = dec_argv(g->a_buf + 1, g->a_len - 1)) == NULL) 1346 return _SMFIS_FAIL; 1347 switch (g->a_buf[0]) 1348 { 1349 case SMFIC_CONNECT: 1350 i = CI_CONN; 1351 break; 1352 case SMFIC_HELO: 1353 i = CI_HELO; 1354 break; 1355 case SMFIC_MAIL: 1356 i = CI_MAIL; 1357 break; 1358 case SMFIC_RCPT: 1359 i = CI_RCPT; 1360 break; 1361 case SMFIC_DATA: 1362 i = CI_DATA; 1363 break; 1364 case SMFIC_BODYEOB: 1365 i = CI_EOM; 1366 break; 1367 case SMFIC_EOH: 1368 i = CI_EOH; 1369 break; 1370 default: 1371 free(argv); 1372 return _SMFIS_FAIL; 1373 } 1374 if (g->a_ctx->ctx_mac_ptr[i] != NULL) 1375 free(g->a_ctx->ctx_mac_ptr[i]); 1376 if (g->a_ctx->ctx_mac_buf[i] != NULL) 1377 free(g->a_ctx->ctx_mac_buf[i]); 1378 g->a_ctx->ctx_mac_ptr[i] = argv; 1379 g->a_ctx->ctx_mac_buf[i] = g->a_buf; 1380 return _SMFIS_KEEP; 1381 } 1382 1383 /* 1384 ** ST_QUIT -- quit command 1385 ** 1386 ** Parameters: 1387 ** g -- generic argument structure 1388 ** 1389 ** Returns: 1390 ** noreply 1391 */ 1392 1393 /* ARGSUSED */ 1394 static int 1395 st_quit(g) 1396 genarg *g; 1397 { 1398 sfsistat (*fi_close) __P((SMFICTX *)); 1399 1400 if (g == NULL) 1401 return _SMFIS_ABORT; 1402 if (g->a_ctx->ctx_smfi != NULL && 1403 (fi_close = g->a_ctx->ctx_smfi->xxfi_close) != NULL) 1404 (void) (*fi_close)(g->a_ctx); 1405 mi_clr_macros(g->a_ctx, 0); 1406 return _SMFIS_NOREPLY; 1407 } 1408 1409 /* 1410 ** ST_BODYCHUNK -- deal with a piece of the mail body 1411 ** 1412 ** Parameters: 1413 ** g -- generic argument structure 1414 ** 1415 ** Returns: 1416 ** continue or filter-specified value 1417 */ 1418 1419 static int 1420 st_bodychunk(g) 1421 genarg *g; 1422 { 1423 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t)); 1424 1425 if (g == NULL) 1426 return _SMFIS_ABORT; 1427 if (g->a_ctx->ctx_smfi != NULL && 1428 (fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL) 1429 return (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf, 1430 g->a_len); 1431 return SMFIS_CONTINUE; 1432 } 1433 1434 /* 1435 ** ST_BODYEND -- deal with the last piece of the mail body 1436 ** 1437 ** Parameters: 1438 ** g -- generic argument structure 1439 ** 1440 ** Returns: 1441 ** continue or filter-specified value 1442 ** 1443 ** Side effects: 1444 ** sends a reply for the body part (if non-empty). 1445 */ 1446 1447 static int 1448 st_bodyend(g) 1449 genarg *g; 1450 { 1451 sfsistat r; 1452 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t)); 1453 sfsistat (*fi_eom) __P((SMFICTX *)); 1454 1455 if (g == NULL) 1456 return _SMFIS_ABORT; 1457 r = SMFIS_CONTINUE; 1458 if (g->a_ctx->ctx_smfi != NULL) 1459 { 1460 if ((fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL && 1461 g->a_len > 0) 1462 { 1463 socket_t sd; 1464 struct timeval timeout; 1465 1466 timeout.tv_sec = g->a_ctx->ctx_timeout; 1467 timeout.tv_usec = 0; 1468 sd = g->a_ctx->ctx_sd; 1469 r = (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf, 1470 g->a_len); 1471 if (r != SMFIS_CONTINUE && 1472 sendreply(r, sd, &timeout, g->a_ctx) != MI_SUCCESS) 1473 return _SMFIS_ABORT; 1474 } 1475 } 1476 if (r == SMFIS_CONTINUE && 1477 (fi_eom = g->a_ctx->ctx_smfi->xxfi_eom) != NULL) 1478 return (*fi_eom)(g->a_ctx); 1479 return r; 1480 } 1481 1482 /* 1483 ** ST_ABORTFCT -- deal with aborts 1484 ** 1485 ** Parameters: 1486 ** g -- generic argument structure 1487 ** 1488 ** Returns: 1489 ** abort or filter-specified value 1490 */ 1491 1492 static int 1493 st_abortfct(g) 1494 genarg *g; 1495 { 1496 sfsistat (*fi_abort) __P((SMFICTX *)); 1497 1498 if (g == NULL) 1499 return _SMFIS_ABORT; 1500 if (g != NULL && g->a_ctx->ctx_smfi != NULL && 1501 (fi_abort = g->a_ctx->ctx_smfi->xxfi_abort) != NULL) 1502 (void) (*fi_abort)(g->a_ctx); 1503 return _SMFIS_NOREPLY; 1504 } 1505 1506 /* 1507 ** TRANS_OK -- is the state transition ok? 1508 ** 1509 ** Parameters: 1510 ** old -- old state 1511 ** new -- new state 1512 ** 1513 ** Returns: 1514 ** state transition ok 1515 */ 1516 1517 static bool 1518 trans_ok(old, new) 1519 int old, new; 1520 { 1521 int s, n; 1522 1523 s = old; 1524 if (s >= SIZE_NEXT_STATES) 1525 return false; 1526 do 1527 { 1528 /* is this state transition allowed? */ 1529 if ((MI_MASK(new) & next_states[s]) != 0) 1530 return true; 1531 1532 /* 1533 ** no: try next state; 1534 ** this works since the relevant states are ordered 1535 ** strict sequentially 1536 */ 1537 1538 n = s + 1; 1539 if (n >= SIZE_NEXT_STATES) 1540 return false; 1541 1542 /* 1543 ** can we actually "skip" this state? 1544 ** see fix_stm() which sets this bit for those 1545 ** states which the filter program is not interested in 1546 */ 1547 1548 if (bitset(NX_SKIP, next_states[n])) 1549 s = n; 1550 else 1551 return false; 1552 } while (s < SIZE_NEXT_STATES); 1553 return false; 1554 } 1555 1556 /* 1557 ** FIX_STM -- add "skip" bits to the state transition table 1558 ** 1559 ** Parameters: 1560 ** ctx -- context structure 1561 ** 1562 ** Returns: 1563 ** None. 1564 ** 1565 ** Side effects: 1566 ** may change state transition table. 1567 */ 1568 1569 static void 1570 fix_stm(ctx) 1571 SMFICTX_PTR ctx; 1572 { 1573 unsigned long fl; 1574 1575 if (ctx == NULL || ctx->ctx_smfi == NULL) 1576 return; 1577 fl = ctx->ctx_pflags; 1578 if (bitset(SMFIP_NOCONNECT, fl)) 1579 next_states[ST_CONN] |= NX_SKIP; 1580 if (bitset(SMFIP_NOHELO, fl)) 1581 next_states[ST_HELO] |= NX_SKIP; 1582 if (bitset(SMFIP_NOMAIL, fl)) 1583 next_states[ST_MAIL] |= NX_SKIP; 1584 if (bitset(SMFIP_NORCPT, fl)) 1585 next_states[ST_RCPT] |= NX_SKIP; 1586 if (bitset(SMFIP_NOHDRS, fl)) 1587 next_states[ST_HDRS] |= NX_SKIP; 1588 if (bitset(SMFIP_NOEOH, fl)) 1589 next_states[ST_EOHS] |= NX_SKIP; 1590 if (bitset(SMFIP_NOBODY, fl)) 1591 next_states[ST_BODY] |= NX_SKIP; 1592 if (bitset(SMFIP_NODATA, fl)) 1593 next_states[ST_DATA] |= NX_SKIP; 1594 if (bitset(SMFIP_NOUNKNOWN, fl)) 1595 next_states[ST_UNKN] |= NX_SKIP; 1596 } 1597 1598 /* 1599 ** DEC_ARGV -- split a buffer into a list of strings, NULL terminated 1600 ** 1601 ** Parameters: 1602 ** buf -- buffer with several strings 1603 ** len -- length of buffer 1604 ** 1605 ** Returns: 1606 ** array of pointers to the individual strings 1607 */ 1608 1609 static char ** 1610 dec_argv(buf, len) 1611 char *buf; 1612 size_t len; 1613 { 1614 char **s; 1615 size_t i; 1616 int elem, nelem; 1617 1618 nelem = 0; 1619 for (i = 0; i < len; i++) 1620 { 1621 if (buf[i] == '\0') 1622 ++nelem; 1623 } 1624 if (nelem == 0) 1625 return NULL; 1626 1627 /* last entry is only for the name */ 1628 s = (char **)malloc((nelem + 1) * (sizeof *s)); 1629 if (s == NULL) 1630 return NULL; 1631 s[0] = buf; 1632 for (i = 0, elem = 0; i < len && elem < nelem; i++) 1633 { 1634 if (buf[i] == '\0') 1635 { 1636 ++elem; 1637 if (i + 1 >= len) 1638 s[elem] = NULL; 1639 else 1640 s[elem] = &(buf[i + 1]); 1641 } 1642 } 1643 1644 /* overwrite last entry (already done above, just paranoia) */ 1645 s[elem] = NULL; 1646 return s; 1647 } 1648 1649 /* 1650 ** DEC_ARG2 -- split a buffer into two strings 1651 ** 1652 ** Parameters: 1653 ** buf -- buffer with two strings 1654 ** len -- length of buffer 1655 ** s1,s2 -- pointer to result strings 1656 ** 1657 ** Returns: 1658 ** MI_FAILURE/MI_SUCCESS 1659 */ 1660 1661 static int 1662 dec_arg2(buf, len, s1, s2) 1663 char *buf; 1664 size_t len; 1665 char **s1; 1666 char **s2; 1667 { 1668 size_t i; 1669 1670 /* paranoia: check for terminating '\0' */ 1671 if (len == 0 || buf[len - 1] != '\0') 1672 return MI_FAILURE; 1673 *s1 = buf; 1674 for (i = 1; i < len && buf[i] != '\0'; i++) 1675 continue; 1676 if (i >= len - 1) 1677 return MI_FAILURE; 1678 *s2 = buf + i + 1; 1679 return MI_SUCCESS; 1680 } 1681 1682 /* 1683 ** SENDOK -- is it ok for the filter to send stuff to the MTA? 1684 ** 1685 ** Parameters: 1686 ** ctx -- context structure 1687 ** flag -- flag to check 1688 ** 1689 ** Returns: 1690 ** sending allowed (in current state) 1691 */ 1692 1693 bool 1694 mi_sendok(ctx, flag) 1695 SMFICTX_PTR ctx; 1696 int flag; 1697 { 1698 if (ctx == NULL || ctx->ctx_smfi == NULL) 1699 return false; 1700 1701 /* did the milter request this operation? */ 1702 if (flag != 0 && !bitset(flag, ctx->ctx_aflags)) 1703 return false; 1704 1705 /* are we in the correct state? It must be "End of Message". */ 1706 return ctx->ctx_state == ST_ENDM; 1707 } 1708 1709 #if _FFR_WORKERS_POOL 1710 /* 1711 ** MI_RD_SOCKET_READY - checks if the socket is ready for read(2) 1712 ** 1713 ** Parameters: 1714 ** sd -- socket_t 1715 ** 1716 ** Returns: 1717 ** true iff socket is ready for read(2) 1718 */ 1719 1720 #define MI_RD_CMD_TO 1 1721 #define MI_RD_MAX_ERR 16 1722 1723 static bool 1724 mi_rd_socket_ready (sd) 1725 socket_t sd; 1726 { 1727 int n; 1728 int nerr = 0; 1729 #if SM_CONF_POLL 1730 struct pollfd pfd; 1731 #else /* SM_CONF_POLL */ 1732 fd_set rd_set, exc_set; 1733 #endif /* SM_CONF_POLL */ 1734 1735 do 1736 { 1737 #if SM_CONF_POLL 1738 pfd.fd = sd; 1739 pfd.events = POLLIN; 1740 pfd.revents = 0; 1741 1742 n = poll(&pfd, 1, MI_RD_CMD_TO); 1743 #else /* SM_CONF_POLL */ 1744 struct timeval timeout; 1745 1746 FD_ZERO(&rd_set); 1747 FD_ZERO(&exc_set); 1748 FD_SET(sd, &rd_set); 1749 FD_SET(sd, &exc_set); 1750 1751 timeout.tv_sec = MI_RD_CMD_TO / 1000; 1752 timeout.tv_usec = 0; 1753 n = select(sd + 1, &rd_set, NULL, &exc_set, &timeout); 1754 #endif /* SM_CONF_POLL */ 1755 1756 if (n < 0) 1757 { 1758 if (errno == EINTR) 1759 { 1760 nerr++; 1761 continue; 1762 } 1763 return true; 1764 } 1765 1766 if (n == 0) 1767 return false; 1768 break; 1769 } while (nerr < MI_RD_MAX_ERR); 1770 if (nerr >= MI_RD_MAX_ERR) 1771 return false; 1772 1773 #if SM_CONF_POLL 1774 return (pfd.revents != 0); 1775 #else /* SM_CONF_POLL */ 1776 return FD_ISSET(sd, &rd_set) || FD_ISSET(sd, &exc_set); 1777 #endif /* SM_CONF_POLL */ 1778 } 1779 #endif /* _FFR_WORKERS_POOL */ 1780