1 /* 2 * Copyright (c) 1999-2004, 2006 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 #include <sm/gen.h> 12 SM_RCSID("@(#)$Id: engine.c,v 8.157 2007/03/26 18:10:04 ca Exp $") 13 14 #include "libmilter.h" 15 16 #if NETINET || NETINET6 17 # include <arpa/inet.h> 18 #endif /* NETINET || NETINET6 */ 19 20 /* generic argument for functions in the command table */ 21 struct arg_struct 22 { 23 size_t a_len; /* length of buffer */ 24 char *a_buf; /* argument string */ 25 int a_idx; /* index for macro array */ 26 SMFICTX_PTR a_ctx; /* context */ 27 }; 28 29 typedef struct arg_struct genarg; 30 31 /* structure for commands received from MTA */ 32 struct cmdfct_t 33 { 34 char cm_cmd; /* command */ 35 int cm_argt; /* type of arguments expected */ 36 int cm_next; /* next state */ 37 int cm_todo; /* what to do next */ 38 int cm_macros; /* index for macros */ 39 int (*cm_fct) __P((genarg *)); /* function to execute */ 40 }; 41 42 typedef struct cmdfct_t cmdfct; 43 44 /* possible values for cm_argt */ 45 #define CM_ARG0 0 /* no args */ 46 #define CM_ARG1 1 /* one arg (string) */ 47 #define CM_ARG2 2 /* two args (strings) */ 48 #define CM_ARGA 4 /* one string and _SOCK_ADDR */ 49 #define CM_ARGO 5 /* two integers */ 50 #define CM_ARGV 8 /* \0 separated list of args, NULL-terminated */ 51 #define CM_ARGN 9 /* \0 separated list of args (strings) */ 52 53 /* possible values for cm_todo */ 54 #define CT_CONT 0x0000 /* continue reading commands */ 55 #define CT_IGNO 0x0001 /* continue even when error */ 56 57 /* not needed right now, done via return code instead */ 58 #define CT_KEEP 0x0004 /* keep buffer (contains symbols) */ 59 #define CT_END 0x0008 /* last command of session, stop replying */ 60 61 /* index in macro array: macros only for these commands */ 62 #define CI_NONE (-1) 63 #define CI_CONN 0 64 #define CI_HELO 1 65 #define CI_MAIL 2 66 #define CI_RCPT 3 67 #define CI_DATA 4 68 #define CI_EOM 5 69 #define CI_EOH 6 70 #define CI_LAST CI_EOH 71 #if CI_LAST < CI_DATA 72 ERROR: do not compile with CI_LAST < CI_DATA 73 #endif 74 #if CI_LAST < CI_EOM 75 ERROR: do not compile with CI_LAST < CI_EOM 76 #endif 77 #if CI_LAST < CI_EOH 78 ERROR: do not compile with CI_LAST < CI_EOH 79 #endif 80 #if CI_LAST < CI_ENVRCPT 81 ERROR: do not compile with CI_LAST < CI_ENVRCPT 82 #endif 83 #if CI_LAST < CI_ENVFROM 84 ERROR: do not compile with CI_LAST < CI_ENVFROM 85 #endif 86 #if CI_LAST < CI_HELO 87 ERROR: do not compile with CI_LAST < CI_HELO 88 #endif 89 #if CI_LAST < CI_CONNECT 90 ERROR: do not compile with CI_LAST < CI_CONNECT 91 #endif 92 #if CI_LAST >= MAX_MACROS_ENTRIES 93 ERROR: do not compile with CI_LAST >= MAX_MACROS_ENTRIES 94 #endif 95 96 /* function prototypes */ 97 static int st_abortfct __P((genarg *)); 98 static int st_macros __P((genarg *)); 99 static int st_optionneg __P((genarg *)); 100 static int st_bodychunk __P((genarg *)); 101 static int st_connectinfo __P((genarg *)); 102 static int st_bodyend __P((genarg *)); 103 static int st_helo __P((genarg *)); 104 static int st_header __P((genarg *)); 105 static int st_sender __P((genarg *)); 106 static int st_rcpt __P((genarg *)); 107 static int st_unknown __P((genarg *)); 108 static int st_data __P((genarg *)); 109 static int st_eoh __P((genarg *)); 110 static int st_quit __P((genarg *)); 111 static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR)); 112 static void fix_stm __P((SMFICTX_PTR)); 113 static bool trans_ok __P((int, int)); 114 static char **dec_argv __P((char *, size_t)); 115 static int dec_arg2 __P((char *, size_t, char **, char **)); 116 117 #if _FFR_WORKERS_POOL 118 static bool mi_rd_socket_ready __P((int)); 119 #endif /* _FFR_WORKERS_POOL */ 120 121 /* states */ 122 #define ST_NONE (-1) 123 #define ST_INIT 0 /* initial state */ 124 #define ST_OPTS 1 /* option negotiation */ 125 #define ST_CONN 2 /* connection info */ 126 #define ST_HELO 3 /* helo */ 127 #define ST_MAIL 4 /* mail from */ 128 #define ST_RCPT 5 /* rcpt to */ 129 #define ST_DATA 6 /* data */ 130 #define ST_HDRS 7 /* headers */ 131 #define ST_EOHS 8 /* end of headers */ 132 #define ST_BODY 9 /* body */ 133 #define ST_ENDM 10 /* end of message */ 134 #define ST_QUIT 11 /* quit */ 135 #define ST_ABRT 12 /* abort */ 136 #define ST_UNKN 13 /* unknown SMTP command */ 137 #define ST_Q_NC 14 /* quit, new connection follows */ 138 #define ST_LAST ST_Q_NC /* last valid state */ 139 #define ST_SKIP 16 /* not a state but required for the state table */ 140 141 /* in a mail transaction? must be before eom according to spec. */ 142 #define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM) 143 144 /* 145 ** set of next states 146 ** each state (ST_*) corresponds to bit in an int value (1 << state) 147 ** each state has a set of allowed transitions ('or' of bits of states) 148 ** so a state transition is valid if the mask of the next state 149 ** is set in the NX_* value 150 ** this function is coded in trans_ok(), see below. 151 */ 152 153 #define MI_MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */ 154 #define NX_INIT (MI_MASK(ST_OPTS)) 155 #define NX_OPTS (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN)) 156 #define NX_CONN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN)) 157 #define NX_HELO (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN)) 158 #define NX_MAIL (MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN)) 159 #define NX_RCPT (MI_MASK(ST_HDRS) | MI_MASK(ST_EOHS) | MI_MASK(ST_DATA) | \ 160 MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | \ 161 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN)) 162 #define NX_DATA (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT)) 163 #define NX_HDRS (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT)) 164 #define NX_EOHS (MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | MI_MASK(ST_ABRT)) 165 #define NX_BODY (MI_MASK(ST_ENDM) | MI_MASK(ST_BODY) | MI_MASK(ST_ABRT)) 166 #define NX_ENDM (MI_MASK(ST_QUIT) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN) | \ 167 MI_MASK(ST_Q_NC)) 168 #define NX_QUIT 0 169 #define NX_ABRT 0 170 #define NX_UNKN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | \ 171 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | \ 172 MI_MASK(ST_DATA) | \ 173 MI_MASK(ST_BODY) | MI_MASK(ST_UNKN) | \ 174 MI_MASK(ST_ABRT) | MI_MASK(ST_QUIT) | MI_MASK(ST_Q_NC)) 175 #define NX_Q_NC (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN)) 176 #define NX_SKIP MI_MASK(ST_SKIP) 177 178 static int next_states[] = 179 { 180 NX_INIT 181 , NX_OPTS 182 , NX_CONN 183 , NX_HELO 184 , NX_MAIL 185 , NX_RCPT 186 , NX_DATA 187 , NX_HDRS 188 , NX_EOHS 189 , NX_BODY 190 , NX_ENDM 191 , NX_QUIT 192 , NX_ABRT 193 , NX_UNKN 194 , NX_Q_NC 195 }; 196 197 #define SIZE_NEXT_STATES (sizeof(next_states) / sizeof(next_states[0])) 198 199 /* commands received by milter */ 200 static cmdfct cmds[] = 201 { 202 {SMFIC_ABORT, CM_ARG0, ST_ABRT, CT_CONT, CI_NONE, st_abortfct } 203 , {SMFIC_MACRO, CM_ARGV, ST_NONE, CT_KEEP, CI_NONE, st_macros } 204 , {SMFIC_BODY, CM_ARG1, ST_BODY, CT_CONT, CI_NONE, st_bodychunk } 205 , {SMFIC_CONNECT, CM_ARG2, ST_CONN, CT_CONT, CI_CONN, st_connectinfo } 206 , {SMFIC_BODYEOB, CM_ARG1, ST_ENDM, CT_CONT, CI_EOM, st_bodyend } 207 , {SMFIC_HELO, CM_ARG1, ST_HELO, CT_CONT, CI_HELO, st_helo } 208 , {SMFIC_HEADER, CM_ARG2, ST_HDRS, CT_CONT, CI_NONE, st_header } 209 , {SMFIC_MAIL, CM_ARGV, ST_MAIL, CT_CONT, CI_MAIL, st_sender } 210 , {SMFIC_OPTNEG, CM_ARGO, ST_OPTS, CT_CONT, CI_NONE, st_optionneg } 211 , {SMFIC_EOH, CM_ARG0, ST_EOHS, CT_CONT, CI_EOH, st_eoh } 212 , {SMFIC_QUIT, CM_ARG0, ST_QUIT, CT_END, CI_NONE, st_quit } 213 , {SMFIC_DATA, CM_ARG0, ST_DATA, CT_CONT, CI_DATA, st_data } 214 , {SMFIC_RCPT, CM_ARGV, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt } 215 , {SMFIC_UNKNOWN, CM_ARG1, ST_UNKN, CT_IGNO, CI_NONE, st_unknown } 216 , {SMFIC_QUIT_NC, CM_ARG0, ST_Q_NC, CT_CONT, CI_NONE, st_quit } 217 }; 218 219 /* 220 ** Additional (internal) reply codes; 221 ** must be coordinated wit libmilter/mfapi.h 222 */ 223 224 #define _SMFIS_KEEP 20 225 #define _SMFIS_ABORT 21 226 #define _SMFIS_OPTIONS 22 227 #define _SMFIS_NOREPLY SMFIS_NOREPLY 228 #define _SMFIS_FAIL (-1) 229 #define _SMFIS_NONE (-2) 230 231 /* 232 ** MI_ENGINE -- receive commands and process them 233 ** 234 ** Parameters: 235 ** ctx -- context structure 236 ** 237 ** Returns: 238 ** MI_FAILURE/MI_SUCCESS 239 */ 240 241 int 242 mi_engine(ctx) 243 SMFICTX_PTR ctx; 244 { 245 size_t len; 246 int i; 247 socket_t sd; 248 int ret = MI_SUCCESS; 249 int ncmds = sizeof(cmds) / sizeof(cmdfct); 250 int curstate = ST_INIT; 251 int newstate; 252 bool call_abort; 253 sfsistat r; 254 char cmd; 255 char *buf = NULL; 256 genarg arg; 257 struct timeval timeout; 258 int (*f) __P((genarg *)); 259 sfsistat (*fi_abort) __P((SMFICTX *)); 260 sfsistat (*fi_close) __P((SMFICTX *)); 261 262 arg.a_ctx = ctx; 263 sd = ctx->ctx_sd; 264 fi_abort = ctx->ctx_smfi->xxfi_abort; 265 #if _FFR_WORKERS_POOL 266 curstate = ctx->ctx_state; 267 if (curstate == ST_INIT) 268 { 269 mi_clr_macros(ctx, 0); 270 fix_stm(ctx); 271 } 272 #else /* _FFR_WORKERS_POOL */ 273 mi_clr_macros(ctx, 0); 274 fix_stm(ctx); 275 #endif /* _FFR_WORKERS_POOL */ 276 r = _SMFIS_NONE; 277 do 278 { 279 /* call abort only if in a mail transaction */ 280 call_abort = ST_IN_MAIL(curstate); 281 timeout.tv_sec = ctx->ctx_timeout; 282 timeout.tv_usec = 0; 283 if (mi_stop() == MILTER_ABRT) 284 { 285 if (ctx->ctx_dbg > 3) 286 sm_dprintf("[%ld] milter_abort\n", 287 (long) ctx->ctx_id); 288 ret = MI_FAILURE; 289 break; 290 } 291 292 /* 293 ** Notice: buf is allocated by mi_rd_cmd() and it will 294 ** usually be free()d after it has been used in f(). 295 ** However, if the function returns _SMFIS_KEEP then buf 296 ** contains macros and will not be free()d. 297 ** Hence r must be set to _SMFIS_NONE if a new buf is 298 ** allocated to avoid problem with housekeeping, esp. 299 ** if the code "break"s out of the loop. 300 */ 301 302 #if _FFR_WORKERS_POOL 303 /* Is the socket ready to be read ??? */ 304 if (!mi_rd_socket_ready(sd)) 305 { 306 ret = MI_CONTINUE; 307 break; 308 } 309 #endif /* _FFR_WORKERS_POOL */ 310 311 r = _SMFIS_NONE; 312 if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len, 313 ctx->ctx_smfi->xxfi_name)) == NULL && 314 cmd < SMFIC_VALIDCMD) 315 { 316 if (ctx->ctx_dbg > 5) 317 sm_dprintf("[%ld] mi_engine: mi_rd_cmd error (%x)\n", 318 (long) ctx->ctx_id, (int) cmd); 319 320 /* 321 ** eof is currently treated as failure -> 322 ** abort() instead of close(), otherwise use: 323 ** if (cmd != SMFIC_EOF) 324 */ 325 326 ret = MI_FAILURE; 327 break; 328 } 329 if (ctx->ctx_dbg > 4) 330 sm_dprintf("[%ld] got cmd '%c' len %d\n", 331 (long) ctx->ctx_id, cmd, (int) len); 332 for (i = 0; i < ncmds; i++) 333 { 334 if (cmd == cmds[i].cm_cmd) 335 break; 336 } 337 if (i >= ncmds) 338 { 339 /* unknown command */ 340 if (ctx->ctx_dbg > 1) 341 sm_dprintf("[%ld] cmd '%c' unknown\n", 342 (long) ctx->ctx_id, cmd); 343 ret = MI_FAILURE; 344 break; 345 } 346 if ((f = cmds[i].cm_fct) == NULL) 347 { 348 /* stop for now */ 349 if (ctx->ctx_dbg > 1) 350 sm_dprintf("[%ld] cmd '%c' not impl\n", 351 (long) ctx->ctx_id, cmd); 352 ret = MI_FAILURE; 353 break; 354 } 355 356 /* is new state ok? */ 357 newstate = cmds[i].cm_next; 358 if (ctx->ctx_dbg > 5) 359 sm_dprintf("[%ld] cur %x new %x nextmask %x\n", 360 (long) ctx->ctx_id, 361 curstate, newstate, next_states[curstate]); 362 363 if (newstate != ST_NONE && !trans_ok(curstate, newstate)) 364 { 365 if (ctx->ctx_dbg > 1) 366 sm_dprintf("[%ld] abort: cur %d (%x) new %d (%x) next %x\n", 367 (long) ctx->ctx_id, 368 curstate, MI_MASK(curstate), 369 newstate, MI_MASK(newstate), 370 next_states[curstate]); 371 372 /* call abort only if in a mail transaction */ 373 if (fi_abort != NULL && call_abort) 374 (void) (*fi_abort)(ctx); 375 376 /* 377 ** try to reach the new state from HELO 378 ** if it can't be reached, ignore the command. 379 */ 380 381 curstate = ST_HELO; 382 if (!trans_ok(curstate, newstate)) 383 { 384 if (buf != NULL) 385 { 386 free(buf); 387 buf = NULL; 388 } 389 continue; 390 } 391 } 392 arg.a_len = len; 393 arg.a_buf = buf; 394 if (newstate != ST_NONE) 395 { 396 curstate = newstate; 397 ctx->ctx_state = curstate; 398 } 399 arg.a_idx = cmds[i].cm_macros; 400 call_abort = ST_IN_MAIL(curstate); 401 402 /* call function to deal with command */ 403 MI_MONITOR_BEGIN(ctx, cmd); 404 r = (*f)(&arg); 405 MI_MONITOR_END(ctx, cmd); 406 if (r != _SMFIS_KEEP && buf != NULL) 407 { 408 free(buf); 409 buf = NULL; 410 } 411 if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS) 412 { 413 ret = MI_FAILURE; 414 break; 415 } 416 417 if (r == SMFIS_ACCEPT) 418 { 419 /* accept mail, no further actions taken */ 420 curstate = ST_HELO; 421 } 422 else if (r == SMFIS_REJECT || r == SMFIS_DISCARD || 423 r == SMFIS_TEMPFAIL) 424 { 425 /* 426 ** further actions depend on current state 427 ** if the IGNO bit is set: "ignore" the error, 428 ** i.e., stay in the current state 429 */ 430 if (!bitset(CT_IGNO, cmds[i].cm_todo)) 431 curstate = ST_HELO; 432 } 433 else if (r == _SMFIS_ABORT) 434 { 435 if (ctx->ctx_dbg > 5) 436 sm_dprintf("[%ld] function returned abort\n", 437 (long) ctx->ctx_id); 438 ret = MI_FAILURE; 439 break; 440 } 441 } while (!bitset(CT_END, cmds[i].cm_todo)); 442 443 ctx->ctx_state = curstate; 444 445 if (ret == MI_FAILURE) 446 { 447 /* call abort only if in a mail transaction */ 448 if (fi_abort != NULL && call_abort) 449 (void) (*fi_abort)(ctx); 450 } 451 452 /* has close been called? */ 453 if (ctx->ctx_state != ST_QUIT 454 #if _FFR_WORKERS_POOL 455 && ret != MI_CONTINUE 456 #endif /* _FFR_WORKERS_POOL */ 457 ) 458 { 459 if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL) 460 (void) (*fi_close)(ctx); 461 } 462 if (r != _SMFIS_KEEP && buf != NULL) 463 free(buf); 464 #if !_FFR_WORKERS_POOL 465 mi_clr_macros(ctx, 0); 466 #endif /* _FFR_WORKERS_POOL */ 467 return ret; 468 } 469 470 static size_t milter_addsymlist __P((SMFICTX_PTR, char *, char **)); 471 472 static size_t 473 milter_addsymlist(ctx, buf, newbuf) 474 SMFICTX_PTR ctx; 475 char *buf; 476 char **newbuf; 477 { 478 size_t len; 479 int i; 480 mi_int32 v; 481 char *buffer; 482 483 SM_ASSERT(ctx != NULL); 484 SM_ASSERT(buf != NULL); 485 SM_ASSERT(newbuf != NULL); 486 len = 0; 487 for (i = 0; i < MAX_MACROS_ENTRIES; i++) 488 { 489 if (ctx->ctx_mac_list[i] != NULL) 490 { 491 len += strlen(ctx->ctx_mac_list[i]) + 1 + 492 MILTER_LEN_BYTES; 493 } 494 } 495 if (len > 0) 496 { 497 size_t offset; 498 499 SM_ASSERT(len + MILTER_OPTLEN > len); 500 len += MILTER_OPTLEN; 501 buffer = malloc(len); 502 if (buffer != NULL) 503 { 504 (void) memcpy(buffer, buf, MILTER_OPTLEN); 505 offset = MILTER_OPTLEN; 506 for (i = 0; i < MAX_MACROS_ENTRIES; i++) 507 { 508 size_t l; 509 510 if (ctx->ctx_mac_list[i] == NULL) 511 continue; 512 513 SM_ASSERT(offset + MILTER_LEN_BYTES < len); 514 v = htonl(i); 515 (void) memcpy(buffer + offset, (void *) &v, 516 MILTER_LEN_BYTES); 517 offset += MILTER_LEN_BYTES; 518 l = strlen(ctx->ctx_mac_list[i]) + 1; 519 SM_ASSERT(offset + l <= len); 520 (void) memcpy(buffer + offset, 521 ctx->ctx_mac_list[i], l); 522 offset += l; 523 } 524 } 525 else 526 { 527 /* oops ... */ 528 } 529 } 530 else 531 { 532 len = MILTER_OPTLEN; 533 buffer = buf; 534 } 535 *newbuf = buffer; 536 return len; 537 } 538 539 /* 540 ** GET_NR_BIT -- get "no reply" bit matching state 541 ** 542 ** Parameters: 543 ** state -- current protocol stage 544 ** 545 ** Returns: 546 ** 0: no matching bit 547 ** >0: the matching "no reply" bit 548 */ 549 550 static unsigned long get_nr_bit __P((int)); 551 552 static unsigned long 553 get_nr_bit(state) 554 int state; 555 { 556 unsigned long bit; 557 558 switch (state) 559 { 560 case ST_CONN: 561 bit = SMFIP_NR_CONN; 562 break; 563 case ST_HELO: 564 bit = SMFIP_NR_HELO; 565 break; 566 case ST_MAIL: 567 bit = SMFIP_NR_MAIL; 568 break; 569 case ST_RCPT: 570 bit = SMFIP_NR_RCPT; 571 break; 572 case ST_DATA: 573 bit = SMFIP_NR_DATA; 574 break; 575 case ST_UNKN: 576 bit = SMFIP_NR_UNKN; 577 break; 578 case ST_HDRS: 579 bit = SMFIP_NR_HDR; 580 break; 581 case ST_EOHS: 582 bit = SMFIP_NR_EOH; 583 break; 584 case ST_BODY: 585 bit = SMFIP_NR_BODY; 586 break; 587 default: 588 bit = 0; 589 break; 590 } 591 return bit; 592 } 593 594 /* 595 ** SENDREPLY -- send a reply to the MTA 596 ** 597 ** Parameters: 598 ** r -- reply code 599 ** sd -- socket descriptor 600 ** timeout_ptr -- (ptr to) timeout to use for sending 601 ** ctx -- context structure 602 ** 603 ** Returns: 604 ** MI_SUCCESS/MI_FAILURE 605 */ 606 607 static int 608 sendreply(r, sd, timeout_ptr, ctx) 609 sfsistat r; 610 socket_t sd; 611 struct timeval *timeout_ptr; 612 SMFICTX_PTR ctx; 613 { 614 int ret; 615 unsigned long bit; 616 617 ret = MI_SUCCESS; 618 619 bit = get_nr_bit(ctx->ctx_state); 620 if (bit != 0 && (ctx->ctx_pflags & bit) != 0 && r != SMFIS_NOREPLY) 621 { 622 if (r >= SMFIS_CONTINUE && r < _SMFIS_KEEP) 623 { 624 /* milter said it wouldn't reply, but it lied... */ 625 smi_log(SMI_LOG_ERR, 626 "%s: milter claimed not to reply in state %d but did anyway %d\n", 627 ctx->ctx_smfi->xxfi_name, 628 ctx->ctx_state, r); 629 630 } 631 632 /* 633 ** Force specified behavior, otherwise libmilter 634 ** and MTA will fail to communicate properly. 635 */ 636 637 switch (r) 638 { 639 case SMFIS_CONTINUE: 640 case SMFIS_TEMPFAIL: 641 case SMFIS_REJECT: 642 case SMFIS_DISCARD: 643 case SMFIS_ACCEPT: 644 case SMFIS_SKIP: 645 case _SMFIS_OPTIONS: 646 r = SMFIS_NOREPLY; 647 break; 648 } 649 } 650 651 switch (r) 652 { 653 case SMFIS_CONTINUE: 654 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 0); 655 break; 656 case SMFIS_TEMPFAIL: 657 case SMFIS_REJECT: 658 if (ctx->ctx_reply != NULL && 659 ((r == SMFIS_TEMPFAIL && *ctx->ctx_reply == '4') || 660 (r == SMFIS_REJECT && *ctx->ctx_reply == '5'))) 661 { 662 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_REPLYCODE, 663 ctx->ctx_reply, 664 strlen(ctx->ctx_reply) + 1); 665 free(ctx->ctx_reply); 666 ctx->ctx_reply = NULL; 667 } 668 else 669 { 670 ret = mi_wr_cmd(sd, timeout_ptr, r == SMFIS_REJECT ? 671 SMFIR_REJECT : SMFIR_TEMPFAIL, NULL, 0); 672 } 673 break; 674 case SMFIS_DISCARD: 675 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_DISCARD, NULL, 0); 676 break; 677 case SMFIS_ACCEPT: 678 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_ACCEPT, NULL, 0); 679 break; 680 case SMFIS_SKIP: 681 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_SKIP, NULL, 0); 682 break; 683 case _SMFIS_OPTIONS: 684 { 685 mi_int32 v; 686 size_t len; 687 char *buffer; 688 char buf[MILTER_OPTLEN]; 689 690 v = htonl(ctx->ctx_prot_vers2mta); 691 (void) memcpy(&(buf[0]), (void *) &v, 692 MILTER_LEN_BYTES); 693 v = htonl(ctx->ctx_aflags); 694 (void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v, 695 MILTER_LEN_BYTES); 696 v = htonl(ctx->ctx_pflags2mta); 697 (void) memcpy(&(buf[MILTER_LEN_BYTES * 2]), 698 (void *) &v, MILTER_LEN_BYTES); 699 len = milter_addsymlist(ctx, buf, &buffer); 700 if (buffer != NULL) 701 ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG, 702 buffer, len); 703 else 704 ret = MI_FAILURE; 705 } 706 break; 707 case SMFIS_NOREPLY: 708 if (bit != 0 && 709 (ctx->ctx_pflags & bit) != 0 && 710 (ctx->ctx_mta_pflags & bit) == 0) 711 { 712 /* 713 ** milter doesn't want to send a reply, 714 ** but the MTA doesn't have that feature: fake it. 715 */ 716 717 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 718 0); 719 } 720 break; 721 default: /* don't send a reply */ 722 break; 723 } 724 return ret; 725 } 726 727 /* 728 ** CLR_MACROS -- clear set of macros starting from a given index 729 ** 730 ** Parameters: 731 ** ctx -- context structure 732 ** m -- index from which to clear all macros 733 ** 734 ** Returns: 735 ** None. 736 */ 737 738 void 739 mi_clr_macros(ctx, m) 740 SMFICTX_PTR ctx; 741 int m; 742 { 743 int i; 744 745 for (i = m; i < MAX_MACROS_ENTRIES; i++) 746 { 747 if (ctx->ctx_mac_ptr[i] != NULL) 748 { 749 free(ctx->ctx_mac_ptr[i]); 750 ctx->ctx_mac_ptr[i] = NULL; 751 } 752 if (ctx->ctx_mac_buf[i] != NULL) 753 { 754 free(ctx->ctx_mac_buf[i]); 755 ctx->ctx_mac_buf[i] = NULL; 756 } 757 } 758 } 759 760 /* 761 ** ST_OPTIONNEG -- negotiate options 762 ** 763 ** Parameters: 764 ** g -- generic argument structure 765 ** 766 ** Returns: 767 ** abort/send options/continue 768 */ 769 770 static int 771 st_optionneg(g) 772 genarg *g; 773 { 774 mi_int32 i, v, fake_pflags; 775 SMFICTX_PTR ctx; 776 int (*fi_negotiate) __P((SMFICTX *, 777 unsigned long, unsigned long, 778 unsigned long, unsigned long, 779 unsigned long *, unsigned long *, 780 unsigned long *, unsigned long *)); 781 782 if (g == NULL || g->a_ctx->ctx_smfi == NULL) 783 return SMFIS_CONTINUE; 784 ctx = g->a_ctx; 785 mi_clr_macros(ctx, g->a_idx + 1); 786 ctx->ctx_prot_vers = SMFI_PROT_VERSION; 787 788 /* check for minimum length */ 789 if (g->a_len < MILTER_OPTLEN) 790 { 791 smi_log(SMI_LOG_ERR, 792 "%s: st_optionneg[%ld]: len too short %d < %d", 793 ctx->ctx_smfi->xxfi_name, 794 (long) ctx->ctx_id, (int) g->a_len, 795 MILTER_OPTLEN); 796 return _SMFIS_ABORT; 797 } 798 799 /* protocol version */ 800 (void) memcpy((void *) &i, (void *) &(g->a_buf[0]), MILTER_LEN_BYTES); 801 v = ntohl(i); 802 803 #define SMFI_PROT_VERSION_MIN 2 804 805 /* check for minimum version */ 806 if (v < SMFI_PROT_VERSION_MIN) 807 { 808 smi_log(SMI_LOG_ERR, 809 "%s: st_optionneg[%ld]: protocol version too old %d < %d", 810 ctx->ctx_smfi->xxfi_name, 811 (long) ctx->ctx_id, v, SMFI_PROT_VERSION_MIN); 812 return _SMFIS_ABORT; 813 } 814 ctx->ctx_mta_prot_vers = v; 815 if (ctx->ctx_prot_vers < ctx->ctx_mta_prot_vers) 816 ctx->ctx_prot_vers2mta = ctx->ctx_prot_vers; 817 else 818 ctx->ctx_prot_vers2mta = ctx->ctx_mta_prot_vers; 819 820 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES]), 821 MILTER_LEN_BYTES); 822 v = ntohl(i); 823 824 /* no flags? set to default value for V1 actions */ 825 if (v == 0) 826 v = SMFI_V1_ACTS; 827 ctx->ctx_mta_aflags = v; /* MTA action flags */ 828 829 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES * 2]), 830 MILTER_LEN_BYTES); 831 v = ntohl(i); 832 833 /* no flags? set to default value for V1 protocol */ 834 if (v == 0) 835 v = SMFI_V1_PROT; 836 ctx->ctx_mta_pflags = v; /* MTA protocol flags */ 837 838 /* 839 ** Copy flags from milter struct into libmilter context; 840 ** this variable will be used later on to check whether 841 ** the MTA "actions" can fulfill the milter requirements, 842 ** but it may be overwritten by the negotiate callback. 843 */ 844 845 ctx->ctx_aflags = ctx->ctx_smfi->xxfi_flags; 846 fake_pflags = SMFIP_NR_CONN 847 |SMFIP_NR_HELO 848 |SMFIP_NR_MAIL 849 |SMFIP_NR_RCPT 850 |SMFIP_NR_DATA 851 |SMFIP_NR_UNKN 852 |SMFIP_NR_HDR 853 |SMFIP_NR_EOH 854 |SMFIP_NR_BODY 855 ; 856 857 if (g->a_ctx->ctx_smfi != NULL && 858 (fi_negotiate = g->a_ctx->ctx_smfi->xxfi_negotiate) != NULL) 859 { 860 int r; 861 unsigned long m_aflags, m_pflags, m_f2, m_f3; 862 863 /* 864 ** let milter decide whether the features offered by the 865 ** MTA are "good enough". 866 ** Notes: 867 ** - libmilter can "fake" some features (e.g., SMFIP_NR_HDR) 868 ** - m_f2, m_f3 are for future extensions 869 */ 870 871 m_f2 = m_f3 = 0; 872 m_aflags = ctx->ctx_mta_aflags; 873 m_pflags = ctx->ctx_pflags; 874 if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0) 875 m_pflags |= SMFIP_SKIP; 876 r = fi_negotiate(g->a_ctx, 877 ctx->ctx_mta_aflags, 878 ctx->ctx_mta_pflags|fake_pflags, 879 0, 0, 880 &m_aflags, &m_pflags, &m_f2, &m_f3); 881 882 /* 883 ** Types of protocol flags (pflags): 884 ** 1. do NOT send protocol step X 885 ** 2. MTA can do/understand something extra (SKIP, 886 ** send unknown RCPTs) 887 ** 3. MTA can deal with "no reply" for various protocol steps 888 ** Note: this mean that it isn't possible to simply set all 889 ** flags to get "everything": 890 ** setting a flag of type 1 turns off a step 891 ** (it should be the other way around: 892 ** a flag means a protocol step can be sent) 893 ** setting a flag of type 3 requires that milter 894 ** never sends a reply for the corresponding step. 895 ** Summary: the "negation" of protocol flags is causing 896 ** problems, but at least for type 3 there is no simple 897 ** solution. 898 ** 899 ** What should "all options" mean? 900 ** send all protocol steps _except_ those for which there is 901 ** no callback (currently registered in ctx_pflags) 902 ** expect SKIP as return code? Yes 903 ** send unknown RCPTs? No, 904 ** must be explicitly requested? 905 ** "no reply" for some protocol steps? No, 906 ** must be explicitly requested. 907 */ 908 909 if (SMFIS_ALL_OPTS == r) 910 { 911 ctx->ctx_aflags = ctx->ctx_mta_aflags; 912 ctx->ctx_pflags2mta = ctx->ctx_pflags; 913 if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0) 914 ctx->ctx_pflags2mta |= SMFIP_SKIP; 915 } 916 else if (r != SMFIS_CONTINUE) 917 { 918 smi_log(SMI_LOG_ERR, 919 "%s: st_optionneg[%ld]: xxfi_negotiate returned %d (protocol options=0x%lx, actions=0x%lx)", 920 ctx->ctx_smfi->xxfi_name, 921 (long) ctx->ctx_id, r, ctx->ctx_mta_pflags, 922 ctx->ctx_mta_aflags); 923 return _SMFIS_ABORT; 924 } 925 else 926 { 927 ctx->ctx_aflags = m_aflags; 928 ctx->ctx_pflags = m_pflags; 929 ctx->ctx_pflags2mta = m_pflags; 930 } 931 932 /* check whether some flags need to be "faked" */ 933 i = ctx->ctx_pflags2mta; 934 if ((ctx->ctx_mta_pflags & i) != i) 935 { 936 unsigned int idx; 937 unsigned long b; 938 939 /* 940 ** If some behavior can be faked (set in fake_pflags), 941 ** but the MTA doesn't support it, then unset 942 ** that flag in the value that is sent to the MTA. 943 */ 944 945 for (idx = 0; idx < 32; idx++) 946 { 947 b = 1 << idx; 948 if ((ctx->ctx_mta_pflags & b) != b && 949 (fake_pflags & b) == b) 950 ctx->ctx_pflags2mta &= ~b; 951 } 952 } 953 } 954 else 955 { 956 /* 957 ** Set the protocol flags based on the values determined 958 ** in mi_listener() which checked the defined callbacks. 959 */ 960 961 ctx->ctx_pflags2mta = ctx->ctx_pflags; 962 } 963 964 /* check whether actions and protocol requirements can be satisfied */ 965 i = ctx->ctx_aflags; 966 if ((i & ctx->ctx_mta_aflags) != i) 967 { 968 smi_log(SMI_LOG_ERR, 969 "%s: st_optionneg[%ld]: 0x%lx does not fulfill action requirements 0x%x", 970 ctx->ctx_smfi->xxfi_name, 971 (long) ctx->ctx_id, ctx->ctx_mta_aflags, i); 972 return _SMFIS_ABORT; 973 } 974 975 i = ctx->ctx_pflags2mta; 976 if ((ctx->ctx_mta_pflags & i) != i) 977 { 978 /* 979 ** Older MTAs do not support some protocol steps. 980 ** As this protocol is a bit "wierd" (it asks for steps 981 ** NOT to be taken/sent) we have to check whether we 982 ** should turn off those "negative" requests. 983 ** Currently these are only SMFIP_NODATA and SMFIP_NOUNKNOWN. 984 */ 985 986 if (bitset(SMFIP_NODATA, ctx->ctx_pflags2mta) && 987 !bitset(SMFIP_NODATA, ctx->ctx_mta_pflags)) 988 ctx->ctx_pflags2mta &= ~SMFIP_NODATA; 989 if (bitset(SMFIP_NOUNKNOWN, ctx->ctx_pflags2mta) && 990 !bitset(SMFIP_NOUNKNOWN, ctx->ctx_mta_pflags)) 991 ctx->ctx_pflags2mta &= ~SMFIP_NOUNKNOWN; 992 i = ctx->ctx_pflags2mta; 993 } 994 995 if ((ctx->ctx_mta_pflags & i) != i) 996 { 997 smi_log(SMI_LOG_ERR, 998 "%s: st_optionneg[%ld]: 0x%lx does not fulfill protocol requirements 0x%x", 999 ctx->ctx_smfi->xxfi_name, 1000 (long) ctx->ctx_id, ctx->ctx_mta_pflags, i); 1001 return _SMFIS_ABORT; 1002 } 1003 1004 if (ctx->ctx_dbg > 3) 1005 sm_dprintf("[%ld] milter_negotiate:" 1006 " mta_actions=0x%lx, mta_flags=0x%lx" 1007 " actions=0x%lx, flags=0x%lx\n" 1008 , (long) ctx->ctx_id 1009 , ctx->ctx_mta_aflags, ctx->ctx_mta_pflags 1010 , ctx->ctx_aflags, ctx->ctx_pflags); 1011 1012 return _SMFIS_OPTIONS; 1013 } 1014 1015 /* 1016 ** ST_CONNECTINFO -- receive connection information 1017 ** 1018 ** Parameters: 1019 ** g -- generic argument structure 1020 ** 1021 ** Returns: 1022 ** continue or filter-specified value 1023 */ 1024 1025 static int 1026 st_connectinfo(g) 1027 genarg *g; 1028 { 1029 size_t l; 1030 size_t i; 1031 char *s, family; 1032 unsigned short port = 0; 1033 _SOCK_ADDR sockaddr; 1034 sfsistat (*fi_connect) __P((SMFICTX *, char *, _SOCK_ADDR *)); 1035 1036 if (g == NULL) 1037 return _SMFIS_ABORT; 1038 mi_clr_macros(g->a_ctx, g->a_idx + 1); 1039 if (g->a_ctx->ctx_smfi == NULL || 1040 (fi_connect = g->a_ctx->ctx_smfi->xxfi_connect) == NULL) 1041 return SMFIS_CONTINUE; 1042 1043 s = g->a_buf; 1044 i = 0; 1045 l = g->a_len; 1046 while (s[i] != '\0' && i <= l) 1047 ++i; 1048 if (i + 1 >= l) 1049 return _SMFIS_ABORT; 1050 1051 /* Move past trailing \0 in host string */ 1052 i++; 1053 family = s[i++]; 1054 (void) memset(&sockaddr, '\0', sizeof sockaddr); 1055 if (family != SMFIA_UNKNOWN) 1056 { 1057 if (i + sizeof port >= l) 1058 { 1059 smi_log(SMI_LOG_ERR, 1060 "%s: connect[%ld]: wrong len %d >= %d", 1061 g->a_ctx->ctx_smfi->xxfi_name, 1062 (long) g->a_ctx->ctx_id, (int) i, (int) l); 1063 return _SMFIS_ABORT; 1064 } 1065 (void) memcpy((void *) &port, (void *) (s + i), 1066 sizeof port); 1067 i += sizeof port; 1068 1069 /* make sure string is terminated */ 1070 if (s[l - 1] != '\0') 1071 return _SMFIS_ABORT; 1072 # if NETINET 1073 if (family == SMFIA_INET) 1074 { 1075 if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr) 1076 != 1) 1077 { 1078 smi_log(SMI_LOG_ERR, 1079 "%s: connect[%ld]: inet_aton failed", 1080 g->a_ctx->ctx_smfi->xxfi_name, 1081 (long) g->a_ctx->ctx_id); 1082 return _SMFIS_ABORT; 1083 } 1084 sockaddr.sa.sa_family = AF_INET; 1085 if (port > 0) 1086 sockaddr.sin.sin_port = port; 1087 } 1088 else 1089 # endif /* NETINET */ 1090 # if NETINET6 1091 if (family == SMFIA_INET6) 1092 { 1093 if (mi_inet_pton(AF_INET6, s + i, 1094 &sockaddr.sin6.sin6_addr) != 1) 1095 { 1096 smi_log(SMI_LOG_ERR, 1097 "%s: connect[%ld]: mi_inet_pton failed", 1098 g->a_ctx->ctx_smfi->xxfi_name, 1099 (long) g->a_ctx->ctx_id); 1100 return _SMFIS_ABORT; 1101 } 1102 sockaddr.sa.sa_family = AF_INET6; 1103 if (port > 0) 1104 sockaddr.sin6.sin6_port = port; 1105 } 1106 else 1107 # endif /* NETINET6 */ 1108 # if NETUNIX 1109 if (family == SMFIA_UNIX) 1110 { 1111 if (sm_strlcpy(sockaddr.sunix.sun_path, s + i, 1112 sizeof sockaddr.sunix.sun_path) >= 1113 sizeof sockaddr.sunix.sun_path) 1114 { 1115 smi_log(SMI_LOG_ERR, 1116 "%s: connect[%ld]: path too long", 1117 g->a_ctx->ctx_smfi->xxfi_name, 1118 (long) g->a_ctx->ctx_id); 1119 return _SMFIS_ABORT; 1120 } 1121 sockaddr.sunix.sun_family = AF_UNIX; 1122 } 1123 else 1124 # endif /* NETUNIX */ 1125 { 1126 smi_log(SMI_LOG_ERR, 1127 "%s: connect[%ld]: unknown family %d", 1128 g->a_ctx->ctx_smfi->xxfi_name, 1129 (long) g->a_ctx->ctx_id, family); 1130 return _SMFIS_ABORT; 1131 } 1132 } 1133 return (*fi_connect)(g->a_ctx, g->a_buf, 1134 family != SMFIA_UNKNOWN ? &sockaddr : NULL); 1135 } 1136 1137 /* 1138 ** ST_EOH -- end of headers 1139 ** 1140 ** Parameters: 1141 ** g -- generic argument structure 1142 ** 1143 ** Returns: 1144 ** continue or filter-specified value 1145 */ 1146 1147 static int 1148 st_eoh(g) 1149 genarg *g; 1150 { 1151 sfsistat (*fi_eoh) __P((SMFICTX *)); 1152 1153 if (g == NULL) 1154 return _SMFIS_ABORT; 1155 if (g->a_ctx->ctx_smfi != NULL && 1156 (fi_eoh = g->a_ctx->ctx_smfi->xxfi_eoh) != NULL) 1157 return (*fi_eoh)(g->a_ctx); 1158 return SMFIS_CONTINUE; 1159 } 1160 1161 /* 1162 ** ST_DATA -- DATA command 1163 ** 1164 ** Parameters: 1165 ** g -- generic argument structure 1166 ** 1167 ** Returns: 1168 ** continue or filter-specified value 1169 */ 1170 1171 static int 1172 st_data(g) 1173 genarg *g; 1174 { 1175 sfsistat (*fi_data) __P((SMFICTX *)); 1176 1177 if (g == NULL) 1178 return _SMFIS_ABORT; 1179 if (g->a_ctx->ctx_smfi != NULL && 1180 (fi_data = g->a_ctx->ctx_smfi->xxfi_data) != NULL) 1181 return (*fi_data)(g->a_ctx); 1182 return SMFIS_CONTINUE; 1183 } 1184 1185 /* 1186 ** ST_HELO -- helo/ehlo command 1187 ** 1188 ** Parameters: 1189 ** g -- generic argument structure 1190 ** 1191 ** Returns: 1192 ** continue or filter-specified value 1193 */ 1194 1195 static int 1196 st_helo(g) 1197 genarg *g; 1198 { 1199 sfsistat (*fi_helo) __P((SMFICTX *, char *)); 1200 1201 if (g == NULL) 1202 return _SMFIS_ABORT; 1203 mi_clr_macros(g->a_ctx, g->a_idx + 1); 1204 if (g->a_ctx->ctx_smfi != NULL && 1205 (fi_helo = g->a_ctx->ctx_smfi->xxfi_helo) != NULL) 1206 { 1207 /* paranoia: check for terminating '\0' */ 1208 if (g->a_len == 0 || g->a_buf[g->a_len - 1] != '\0') 1209 return MI_FAILURE; 1210 return (*fi_helo)(g->a_ctx, g->a_buf); 1211 } 1212 return SMFIS_CONTINUE; 1213 } 1214 1215 /* 1216 ** ST_HEADER -- header line 1217 ** 1218 ** Parameters: 1219 ** g -- generic argument structure 1220 ** 1221 ** Returns: 1222 ** continue or filter-specified value 1223 */ 1224 1225 static int 1226 st_header(g) 1227 genarg *g; 1228 { 1229 char *hf, *hv; 1230 sfsistat (*fi_header) __P((SMFICTX *, char *, char *)); 1231 1232 if (g == NULL) 1233 return _SMFIS_ABORT; 1234 if (g->a_ctx->ctx_smfi == NULL || 1235 (fi_header = g->a_ctx->ctx_smfi->xxfi_header) == NULL) 1236 return SMFIS_CONTINUE; 1237 if (dec_arg2(g->a_buf, g->a_len, &hf, &hv) == MI_SUCCESS) 1238 return (*fi_header)(g->a_ctx, hf, hv); 1239 else 1240 return _SMFIS_ABORT; 1241 } 1242 1243 #define ARGV_FCT(lf, rf, idx) \ 1244 char **argv; \ 1245 sfsistat (*lf) __P((SMFICTX *, char **)); \ 1246 int r; \ 1247 \ 1248 if (g == NULL) \ 1249 return _SMFIS_ABORT; \ 1250 mi_clr_macros(g->a_ctx, g->a_idx + 1); \ 1251 if (g->a_ctx->ctx_smfi == NULL || \ 1252 (lf = g->a_ctx->ctx_smfi->rf) == NULL) \ 1253 return SMFIS_CONTINUE; \ 1254 if ((argv = dec_argv(g->a_buf, g->a_len)) == NULL) \ 1255 return _SMFIS_ABORT; \ 1256 r = (*lf)(g->a_ctx, argv); \ 1257 free(argv); \ 1258 return r; 1259 1260 /* 1261 ** ST_SENDER -- MAIL FROM command 1262 ** 1263 ** Parameters: 1264 ** g -- generic argument structure 1265 ** 1266 ** Returns: 1267 ** continue or filter-specified value 1268 */ 1269 1270 static int 1271 st_sender(g) 1272 genarg *g; 1273 { 1274 ARGV_FCT(fi_envfrom, xxfi_envfrom, CI_MAIL) 1275 } 1276 1277 /* 1278 ** ST_RCPT -- RCPT TO command 1279 ** 1280 ** Parameters: 1281 ** g -- generic argument structure 1282 ** 1283 ** Returns: 1284 ** continue or filter-specified value 1285 */ 1286 1287 static int 1288 st_rcpt(g) 1289 genarg *g; 1290 { 1291 ARGV_FCT(fi_envrcpt, xxfi_envrcpt, CI_RCPT) 1292 } 1293 1294 /* 1295 ** ST_UNKNOWN -- unrecognized or unimplemented command 1296 ** 1297 ** Parameters: 1298 ** g -- generic argument structure 1299 ** 1300 ** Returns: 1301 ** continue or filter-specified value 1302 */ 1303 1304 static int 1305 st_unknown(g) 1306 genarg *g; 1307 { 1308 sfsistat (*fi_unknown) __P((SMFICTX *, const char *)); 1309 1310 if (g == NULL) 1311 return _SMFIS_ABORT; 1312 if (g->a_ctx->ctx_smfi != NULL && 1313 (fi_unknown = g->a_ctx->ctx_smfi->xxfi_unknown) != NULL) 1314 return (*fi_unknown)(g->a_ctx, (const char *) g->a_buf); 1315 return SMFIS_CONTINUE; 1316 } 1317 1318 /* 1319 ** ST_MACROS -- deal with macros received from the MTA 1320 ** 1321 ** Parameters: 1322 ** g -- generic argument structure 1323 ** 1324 ** Returns: 1325 ** continue/keep 1326 ** 1327 ** Side effects: 1328 ** set pointer in macro array to current values. 1329 */ 1330 1331 static int 1332 st_macros(g) 1333 genarg *g; 1334 { 1335 int i; 1336 char **argv; 1337 1338 if (g == NULL || g->a_len < 1) 1339 return _SMFIS_FAIL; 1340 if ((argv = dec_argv(g->a_buf + 1, g->a_len - 1)) == NULL) 1341 return _SMFIS_FAIL; 1342 switch (g->a_buf[0]) 1343 { 1344 case SMFIC_CONNECT: 1345 i = CI_CONN; 1346 break; 1347 case SMFIC_HELO: 1348 i = CI_HELO; 1349 break; 1350 case SMFIC_MAIL: 1351 i = CI_MAIL; 1352 break; 1353 case SMFIC_RCPT: 1354 i = CI_RCPT; 1355 break; 1356 case SMFIC_DATA: 1357 i = CI_DATA; 1358 break; 1359 case SMFIC_BODYEOB: 1360 i = CI_EOM; 1361 break; 1362 case SMFIC_EOH: 1363 i = CI_EOH; 1364 break; 1365 default: 1366 free(argv); 1367 return _SMFIS_FAIL; 1368 } 1369 if (g->a_ctx->ctx_mac_ptr[i] != NULL) 1370 free(g->a_ctx->ctx_mac_ptr[i]); 1371 if (g->a_ctx->ctx_mac_buf[i] != NULL) 1372 free(g->a_ctx->ctx_mac_buf[i]); 1373 g->a_ctx->ctx_mac_ptr[i] = argv; 1374 g->a_ctx->ctx_mac_buf[i] = g->a_buf; 1375 return _SMFIS_KEEP; 1376 } 1377 1378 /* 1379 ** ST_QUIT -- quit command 1380 ** 1381 ** Parameters: 1382 ** g -- generic argument structure 1383 ** 1384 ** Returns: 1385 ** noreply 1386 */ 1387 1388 /* ARGSUSED */ 1389 static int 1390 st_quit(g) 1391 genarg *g; 1392 { 1393 sfsistat (*fi_close) __P((SMFICTX *)); 1394 1395 if (g == NULL) 1396 return _SMFIS_ABORT; 1397 if (g->a_ctx->ctx_smfi != NULL && 1398 (fi_close = g->a_ctx->ctx_smfi->xxfi_close) != NULL) 1399 (void) (*fi_close)(g->a_ctx); 1400 mi_clr_macros(g->a_ctx, 0); 1401 return _SMFIS_NOREPLY; 1402 } 1403 1404 /* 1405 ** ST_BODYCHUNK -- deal with a piece of the mail body 1406 ** 1407 ** Parameters: 1408 ** g -- generic argument structure 1409 ** 1410 ** Returns: 1411 ** continue or filter-specified value 1412 */ 1413 1414 static int 1415 st_bodychunk(g) 1416 genarg *g; 1417 { 1418 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t)); 1419 1420 if (g == NULL) 1421 return _SMFIS_ABORT; 1422 if (g->a_ctx->ctx_smfi != NULL && 1423 (fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL) 1424 return (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf, 1425 g->a_len); 1426 return SMFIS_CONTINUE; 1427 } 1428 1429 /* 1430 ** ST_BODYEND -- deal with the last piece of the mail body 1431 ** 1432 ** Parameters: 1433 ** g -- generic argument structure 1434 ** 1435 ** Returns: 1436 ** continue or filter-specified value 1437 ** 1438 ** Side effects: 1439 ** sends a reply for the body part (if non-empty). 1440 */ 1441 1442 static int 1443 st_bodyend(g) 1444 genarg *g; 1445 { 1446 sfsistat r; 1447 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t)); 1448 sfsistat (*fi_eom) __P((SMFICTX *)); 1449 1450 if (g == NULL) 1451 return _SMFIS_ABORT; 1452 r = SMFIS_CONTINUE; 1453 if (g->a_ctx->ctx_smfi != NULL) 1454 { 1455 if ((fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL && 1456 g->a_len > 0) 1457 { 1458 socket_t sd; 1459 struct timeval timeout; 1460 1461 timeout.tv_sec = g->a_ctx->ctx_timeout; 1462 timeout.tv_usec = 0; 1463 sd = g->a_ctx->ctx_sd; 1464 r = (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf, 1465 g->a_len); 1466 if (r != SMFIS_CONTINUE && 1467 sendreply(r, sd, &timeout, g->a_ctx) != MI_SUCCESS) 1468 return _SMFIS_ABORT; 1469 } 1470 } 1471 if (r == SMFIS_CONTINUE && 1472 (fi_eom = g->a_ctx->ctx_smfi->xxfi_eom) != NULL) 1473 return (*fi_eom)(g->a_ctx); 1474 return r; 1475 } 1476 1477 /* 1478 ** ST_ABORTFCT -- deal with aborts 1479 ** 1480 ** Parameters: 1481 ** g -- generic argument structure 1482 ** 1483 ** Returns: 1484 ** abort or filter-specified value 1485 */ 1486 1487 static int 1488 st_abortfct(g) 1489 genarg *g; 1490 { 1491 sfsistat (*fi_abort) __P((SMFICTX *)); 1492 1493 if (g == NULL) 1494 return _SMFIS_ABORT; 1495 if (g != NULL && g->a_ctx->ctx_smfi != NULL && 1496 (fi_abort = g->a_ctx->ctx_smfi->xxfi_abort) != NULL) 1497 (void) (*fi_abort)(g->a_ctx); 1498 return _SMFIS_NOREPLY; 1499 } 1500 1501 /* 1502 ** TRANS_OK -- is the state transition ok? 1503 ** 1504 ** Parameters: 1505 ** old -- old state 1506 ** new -- new state 1507 ** 1508 ** Returns: 1509 ** state transition ok 1510 */ 1511 1512 static bool 1513 trans_ok(old, new) 1514 int old, new; 1515 { 1516 int s, n; 1517 1518 s = old; 1519 if (s >= SIZE_NEXT_STATES) 1520 return false; 1521 do 1522 { 1523 /* is this state transition allowed? */ 1524 if ((MI_MASK(new) & next_states[s]) != 0) 1525 return true; 1526 1527 /* 1528 ** no: try next state; 1529 ** this works since the relevant states are ordered 1530 ** strict sequentially 1531 */ 1532 1533 n = s + 1; 1534 if (n >= SIZE_NEXT_STATES) 1535 return false; 1536 1537 /* 1538 ** can we actually "skip" this state? 1539 ** see fix_stm() which sets this bit for those 1540 ** states which the filter program is not interested in 1541 */ 1542 1543 if (bitset(NX_SKIP, next_states[n])) 1544 s = n; 1545 else 1546 return false; 1547 } while (s < SIZE_NEXT_STATES); 1548 return false; 1549 } 1550 1551 /* 1552 ** FIX_STM -- add "skip" bits to the state transition table 1553 ** 1554 ** Parameters: 1555 ** ctx -- context structure 1556 ** 1557 ** Returns: 1558 ** None. 1559 ** 1560 ** Side effects: 1561 ** may change state transition table. 1562 */ 1563 1564 static void 1565 fix_stm(ctx) 1566 SMFICTX_PTR ctx; 1567 { 1568 unsigned long fl; 1569 1570 if (ctx == NULL || ctx->ctx_smfi == NULL) 1571 return; 1572 fl = ctx->ctx_pflags; 1573 if (bitset(SMFIP_NOCONNECT, fl)) 1574 next_states[ST_CONN] |= NX_SKIP; 1575 if (bitset(SMFIP_NOHELO, fl)) 1576 next_states[ST_HELO] |= NX_SKIP; 1577 if (bitset(SMFIP_NOMAIL, fl)) 1578 next_states[ST_MAIL] |= NX_SKIP; 1579 if (bitset(SMFIP_NORCPT, fl)) 1580 next_states[ST_RCPT] |= NX_SKIP; 1581 if (bitset(SMFIP_NOHDRS, fl)) 1582 next_states[ST_HDRS] |= NX_SKIP; 1583 if (bitset(SMFIP_NOEOH, fl)) 1584 next_states[ST_EOHS] |= NX_SKIP; 1585 if (bitset(SMFIP_NOBODY, fl)) 1586 next_states[ST_BODY] |= NX_SKIP; 1587 if (bitset(SMFIP_NODATA, fl)) 1588 next_states[ST_DATA] |= NX_SKIP; 1589 if (bitset(SMFIP_NOUNKNOWN, fl)) 1590 next_states[ST_UNKN] |= NX_SKIP; 1591 } 1592 1593 /* 1594 ** DEC_ARGV -- split a buffer into a list of strings, NULL terminated 1595 ** 1596 ** Parameters: 1597 ** buf -- buffer with several strings 1598 ** len -- length of buffer 1599 ** 1600 ** Returns: 1601 ** array of pointers to the individual strings 1602 */ 1603 1604 static char ** 1605 dec_argv(buf, len) 1606 char *buf; 1607 size_t len; 1608 { 1609 char **s; 1610 size_t i; 1611 int elem, nelem; 1612 1613 nelem = 0; 1614 for (i = 0; i < len; i++) 1615 { 1616 if (buf[i] == '\0') 1617 ++nelem; 1618 } 1619 if (nelem == 0) 1620 return NULL; 1621 1622 /* last entry is only for the name */ 1623 s = (char **)malloc((nelem + 1) * (sizeof *s)); 1624 if (s == NULL) 1625 return NULL; 1626 s[0] = buf; 1627 for (i = 0, elem = 0; i < len && elem < nelem; i++) 1628 { 1629 if (buf[i] == '\0') 1630 { 1631 ++elem; 1632 if (i + 1 >= len) 1633 s[elem] = NULL; 1634 else 1635 s[elem] = &(buf[i + 1]); 1636 } 1637 } 1638 1639 /* overwrite last entry (already done above, just paranoia) */ 1640 s[elem] = NULL; 1641 return s; 1642 } 1643 1644 /* 1645 ** DEC_ARG2 -- split a buffer into two strings 1646 ** 1647 ** Parameters: 1648 ** buf -- buffer with two strings 1649 ** len -- length of buffer 1650 ** s1,s2 -- pointer to result strings 1651 ** 1652 ** Returns: 1653 ** MI_FAILURE/MI_SUCCESS 1654 */ 1655 1656 static int 1657 dec_arg2(buf, len, s1, s2) 1658 char *buf; 1659 size_t len; 1660 char **s1; 1661 char **s2; 1662 { 1663 size_t i; 1664 1665 /* paranoia: check for terminating '\0' */ 1666 if (len == 0 || buf[len - 1] != '\0') 1667 return MI_FAILURE; 1668 *s1 = buf; 1669 for (i = 1; i < len && buf[i] != '\0'; i++) 1670 continue; 1671 if (i >= len - 1) 1672 return MI_FAILURE; 1673 *s2 = buf + i + 1; 1674 return MI_SUCCESS; 1675 } 1676 1677 /* 1678 ** SENDOK -- is it ok for the filter to send stuff to the MTA? 1679 ** 1680 ** Parameters: 1681 ** ctx -- context structure 1682 ** flag -- flag to check 1683 ** 1684 ** Returns: 1685 ** sending allowed (in current state) 1686 */ 1687 1688 bool 1689 mi_sendok(ctx, flag) 1690 SMFICTX_PTR ctx; 1691 int flag; 1692 { 1693 if (ctx == NULL || ctx->ctx_smfi == NULL) 1694 return false; 1695 1696 /* did the milter request this operation? */ 1697 if (flag != 0 && !bitset(flag, ctx->ctx_aflags)) 1698 return false; 1699 1700 /* are we in the correct state? It must be "End of Message". */ 1701 return ctx->ctx_state == ST_ENDM; 1702 } 1703 1704 #if _FFR_WORKERS_POOL 1705 /* 1706 ** MI_RD_SOCKET_READY - checks if the socket is ready for read(2) 1707 ** 1708 ** Parameters: 1709 ** sd -- socket_t 1710 ** 1711 ** Returns: 1712 ** true iff socket is ready for read(2) 1713 */ 1714 1715 #define MI_RD_CMD_TO 1 1716 #define MI_RD_MAX_ERR 16 1717 1718 static bool 1719 mi_rd_socket_ready (sd) 1720 socket_t sd; 1721 { 1722 int n; 1723 int nerr = 0; 1724 #if SM_CONF_POLL 1725 struct pollfd pfd; 1726 #else /* SM_CONF_POLL */ 1727 fd_set rd_set, exc_set; 1728 #endif /* SM_CONF_POLL */ 1729 1730 do 1731 { 1732 #if SM_CONF_POLL 1733 pfd.fd = sd; 1734 pfd.events = POLLIN; 1735 pfd.revents = 0; 1736 1737 n = poll(&pfd, 1, MI_RD_CMD_TO); 1738 #else /* SM_CONF_POLL */ 1739 struct timeval timeout; 1740 1741 FD_ZERO(&rd_set); 1742 FD_ZERO(&exc_set); 1743 FD_SET(sd, &rd_set); 1744 FD_SET(sd, &exc_set); 1745 1746 timeout.tv_sec = MI_RD_CMD_TO / 1000; 1747 timeout.tv_usec = 0; 1748 n = select(sd + 1, &rd_set, NULL, &exc_set, &timeout); 1749 #endif /* SM_CONF_POLL */ 1750 1751 if (n < 0) 1752 { 1753 if (errno == EINTR) 1754 { 1755 nerr++; 1756 continue; 1757 } 1758 return true; 1759 } 1760 1761 if (n == 0) 1762 return false; 1763 break; 1764 } while (nerr < MI_RD_MAX_ERR); 1765 if (nerr >= MI_RD_MAX_ERR) 1766 return false; 1767 1768 #if SM_CONF_POLL 1769 return (pfd.revents != 0); 1770 #else /* SM_CONF_POLL */ 1771 return FD_ISSET(sd, &rd_set) || FD_ISSET(sd, &exc_set); 1772 #endif /* SM_CONF_POLL */ 1773 } 1774 #endif /* _FFR_WORKERS_POOL */ 1775