engine.c revision 90792
1/* 2 * Copyright (c) 1999-2001 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> 12SM_RCSID("@(#)$Id: engine.c,v 8.102 2001/12/13 17:10:00 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 */ 21struct 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 29typedef struct arg_struct genarg; 30 31/* structure for commands received from MTA */ 32struct 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 42typedef 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 /* start 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#if CI_RCPT >= MAX_MACROS_ENTRIES 68ERROR: do not compile with CI_RCPT >= MAX_MACROS_ENTRIES 69#endif 70 71/* function prototypes */ 72static int st_abortfct __P((genarg *)); 73static int st_macros __P((genarg *)); 74static int st_optionneg __P((genarg *)); 75static int st_bodychunk __P((genarg *)); 76static int st_connectinfo __P((genarg *)); 77static int st_bodyend __P((genarg *)); 78static int st_helo __P((genarg *)); 79static int st_header __P((genarg *)); 80static int st_sender __P((genarg *)); 81static int st_rcpt __P((genarg *)); 82static int st_eoh __P((genarg *)); 83static int st_quit __P((genarg *)); 84static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR)); 85static void fix_stm __P((SMFICTX_PTR)); 86static bool trans_ok __P((int, int)); 87static char **dec_argv __P((char *, size_t)); 88static int dec_arg2 __P((char *, size_t, char **, char **)); 89 90/* states */ 91#define ST_NONE (-1) 92#define ST_INIT 0 /* initial state */ 93#define ST_OPTS 1 /* option negotiation */ 94#define ST_CONN 2 /* connection info */ 95#define ST_HELO 3 /* helo */ 96#define ST_MAIL 4 /* mail from */ 97#define ST_RCPT 5 /* rcpt to */ 98#define ST_HDRS 6 /* headers */ 99#define ST_EOHS 7 /* end of headers */ 100#define ST_BODY 8 /* body */ 101#define ST_ENDM 9 /* end of message */ 102#define ST_QUIT 10 /* quit */ 103#define ST_ABRT 11 /* abort */ 104#define ST_LAST ST_ABRT 105#define ST_SKIP 15 /* not a state but required for the state table */ 106 107/* in a mail transaction? must be before eom according to spec. */ 108#define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM) 109 110/* 111** set of next states 112** each state (ST_*) corresponds to bit in an int value (1 << state) 113** each state has a set of allowed transitions ('or' of bits of states) 114** so a state transition is valid if the mask of the next state 115** is set in the NX_* value 116** this function is coded in trans_ok(), see below. 117*/ 118 119#define MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */ 120#define NX_INIT (MASK(ST_OPTS)) 121#define NX_OPTS (MASK(ST_CONN)) 122#define NX_CONN (MASK(ST_HELO) | MASK(ST_MAIL)) 123#define NX_HELO (MASK(ST_HELO) | MASK(ST_MAIL)) 124#define NX_MAIL (MASK(ST_RCPT) | MASK(ST_ABRT)) 125#define NX_RCPT (MASK(ST_HDRS) | MASK(ST_EOHS) | \ 126 MASK(ST_BODY) | MASK(ST_ENDM) | \ 127 MASK(ST_RCPT) | MASK(ST_ABRT)) 128#define NX_HDRS (MASK(ST_EOHS) | MASK(ST_HDRS) | MASK(ST_ABRT)) 129#define NX_EOHS (MASK(ST_BODY) | MASK(ST_ENDM) | MASK(ST_ABRT)) 130#define NX_BODY (MASK(ST_ENDM) | MASK(ST_BODY) | MASK(ST_ABRT)) 131#define NX_ENDM (MASK(ST_QUIT) | MASK(ST_MAIL)) 132#define NX_QUIT 0 133#define NX_ABRT 0 134#define NX_SKIP MASK(ST_SKIP) 135 136static int next_states[] = 137{ 138 NX_INIT, 139 NX_OPTS, 140 NX_CONN, 141 NX_HELO, 142 NX_MAIL, 143 NX_RCPT, 144 NX_HDRS, 145 NX_EOHS, 146 NX_BODY, 147 NX_ENDM, 148 NX_QUIT, 149 NX_ABRT 150}; 151 152/* commands received by milter */ 153static cmdfct cmds[] = 154{ 155{SMFIC_ABORT, CM_ARG0, ST_ABRT, CT_CONT, CI_NONE, st_abortfct }, 156{SMFIC_MACRO, CM_ARGV, ST_NONE, CT_KEEP, CI_NONE, st_macros }, 157{SMFIC_BODY, CM_ARG1, ST_BODY, CT_CONT, CI_NONE, st_bodychunk }, 158{SMFIC_CONNECT, CM_ARG2, ST_CONN, CT_CONT, CI_CONN, st_connectinfo }, 159{SMFIC_BODYEOB, CM_ARG1, ST_ENDM, CT_CONT, CI_NONE, st_bodyend }, 160{SMFIC_HELO, CM_ARG1, ST_HELO, CT_CONT, CI_HELO, st_helo }, 161{SMFIC_HEADER, CM_ARG2, ST_HDRS, CT_CONT, CI_NONE, st_header }, 162{SMFIC_MAIL, CM_ARGV, ST_MAIL, CT_CONT, CI_MAIL, st_sender }, 163{SMFIC_OPTNEG, CM_ARGO, ST_OPTS, CT_CONT, CI_NONE, st_optionneg }, 164{SMFIC_EOH, CM_ARG0, ST_EOHS, CT_CONT, CI_NONE, st_eoh }, 165{SMFIC_QUIT, CM_ARG0, ST_QUIT, CT_END, CI_NONE, st_quit }, 166{SMFIC_RCPT, CM_ARGV, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt } 167}; 168 169/* additional (internal) reply codes */ 170#define _SMFIS_KEEP 20 171#define _SMFIS_ABORT 21 172#define _SMFIS_OPTIONS 22 173#define _SMFIS_NOREPLY 23 174#define _SMFIS_FAIL (-1) 175#define _SMFIS_NONE (-2) 176 177/* 178** MI_ENGINE -- receive commands and process them 179** 180** Parameters: 181** ctx -- context structure 182** 183** Returns: 184** MI_FAILURE/MI_SUCCESS 185*/ 186int 187mi_engine(ctx) 188 SMFICTX_PTR ctx; 189{ 190 size_t len; 191 int i; 192 socket_t sd; 193 int ret = MI_SUCCESS; 194 int ncmds = sizeof(cmds) / sizeof(cmdfct); 195 int curstate = ST_INIT; 196 int newstate; 197 bool call_abort; 198 sfsistat r; 199 char cmd; 200 char *buf = NULL; 201 genarg arg; 202 struct timeval timeout; 203 int (*f) __P((genarg *)); 204 sfsistat (*fi_abort) __P((SMFICTX *)); 205 sfsistat (*fi_close) __P((SMFICTX *)); 206 207 arg.a_ctx = ctx; 208 sd = ctx->ctx_sd; 209 fi_abort = ctx->ctx_smfi->xxfi_abort; 210 mi_clr_macros(ctx, 0); 211 fix_stm(ctx); 212 r = _SMFIS_NONE; 213 do 214 { 215 /* call abort only if in a mail transaction */ 216 call_abort = ST_IN_MAIL(curstate); 217 timeout.tv_sec = ctx->ctx_timeout; 218 timeout.tv_usec = 0; 219 if (mi_stop() == MILTER_ABRT) 220 { 221 if (ctx->ctx_dbg > 3) 222 sm_dprintf("[%d] milter_abort\n", 223 (int) ctx->ctx_id); 224 ret = MI_FAILURE; 225 break; 226 } 227 228 /* 229 ** Notice: buf is allocated by mi_rd_cmd() and it will 230 ** usually be free()d after it has been used in f(). 231 ** However, if the function returns _SMFIS_KEEP then buf 232 ** contains macros and will not be free()d. 233 ** Hence r must be set to _SMFIS_NONE if a new buf is 234 ** allocated to avoid problem with housekeeping, esp. 235 ** if the code "break"s out of the loop. 236 */ 237 238 r = _SMFIS_NONE; 239 if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len, 240 ctx->ctx_smfi->xxfi_name)) == NULL && 241 cmd < SMFIC_VALIDCMD) 242 { 243 if (ctx->ctx_dbg > 5) 244 sm_dprintf("[%d] mi_engine: mi_rd_cmd error (%x)\n", 245 (int) ctx->ctx_id, (int) cmd); 246 247 /* 248 ** eof is currently treated as failure -> 249 ** abort() instead of close(), otherwise use: 250 ** if (cmd != SMFIC_EOF) 251 */ 252 253 ret = MI_FAILURE; 254 break; 255 } 256 if (ctx->ctx_dbg > 4) 257 sm_dprintf("[%d] got cmd '%c' len %d\n", 258 (int) ctx->ctx_id, cmd, len); 259 for (i = 0; i < ncmds; i++) 260 { 261 if (cmd == cmds[i].cm_cmd) 262 break; 263 } 264 if (i >= ncmds) 265 { 266 /* unknown command */ 267 if (ctx->ctx_dbg > 1) 268 sm_dprintf("[%d] cmd '%c' unknown\n", 269 (int) ctx->ctx_id, cmd); 270 ret = MI_FAILURE; 271 break; 272 } 273 if ((f = cmds[i].cm_fct) == NULL) 274 { 275 /* stop for now */ 276 if (ctx->ctx_dbg > 1) 277 sm_dprintf("[%d] cmd '%c' not impl\n", 278 (int) ctx->ctx_id, cmd); 279 ret = MI_FAILURE; 280 break; 281 } 282 283 /* is new state ok? */ 284 newstate = cmds[i].cm_next; 285 if (ctx->ctx_dbg > 5) 286 sm_dprintf("[%d] cur %x new %x nextmask %x\n", 287 (int) ctx->ctx_id, 288 curstate, newstate, next_states[curstate]); 289 290 if (newstate != ST_NONE && !trans_ok(curstate, newstate)) 291 { 292 if (ctx->ctx_dbg > 1) 293 sm_dprintf("[%d] abort: cur %d (%x) new %d (%x) next %x\n", 294 (int) ctx->ctx_id, 295 curstate, MASK(curstate), 296 newstate, MASK(newstate), 297 next_states[curstate]); 298 299 /* call abort only if in a mail transaction */ 300 if (fi_abort != NULL && call_abort) 301 (void) (*fi_abort)(ctx); 302 303 /* 304 ** try to reach the new state from HELO 305 ** if it can't be reached, ignore the command. 306 */ 307 308 curstate = ST_HELO; 309 if (!trans_ok(curstate, newstate)) 310 { 311 free(buf); 312 buf = NULL; 313 continue; 314 } 315 } 316 arg.a_len = len; 317 arg.a_buf = buf; 318 if (newstate != ST_NONE) 319 { 320 curstate = newstate; 321 ctx->ctx_state = curstate; 322 } 323 arg.a_idx = cmds[i].cm_macros; 324 325 /* call function to deal with command */ 326 r = (*f)(&arg); 327 if (r != _SMFIS_KEEP && buf != NULL) 328 { 329 free(buf); 330 buf = NULL; 331 } 332 if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS) 333 { 334 ret = MI_FAILURE; 335 break; 336 } 337 338 call_abort = ST_IN_MAIL(curstate); 339 if (r == SMFIS_ACCEPT) 340 { 341 /* accept mail, no further actions taken */ 342 curstate = ST_HELO; 343 } 344 else if (r == SMFIS_REJECT || r == SMFIS_DISCARD || 345 r == SMFIS_TEMPFAIL) 346 { 347 /* 348 ** further actions depend on current state 349 ** if the IGNO bit is set: "ignore" the error, 350 ** i.e., stay in the current state 351 */ 352 if (!bitset(CT_IGNO, cmds[i].cm_todo)) 353 curstate = ST_HELO; 354 } 355 else if (r == _SMFIS_ABORT) 356 { 357 if (ctx->ctx_dbg > 5) 358 sm_dprintf("[%d] function returned abort\n", 359 (int) ctx->ctx_id); 360 ret = MI_FAILURE; 361 break; 362 } 363 } while (!bitset(CT_END, cmds[i].cm_todo)); 364 365 if (ret != MI_SUCCESS) 366 { 367 /* call abort only if in a mail transaction */ 368 if (fi_abort != NULL && call_abort) 369 (void) (*fi_abort)(ctx); 370 } 371 372 /* close must always be called */ 373 if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL) 374 (void) (*fi_close)(ctx); 375 if (r != _SMFIS_KEEP && buf != NULL) 376 free(buf); 377 mi_clr_macros(ctx, 0); 378 return ret; 379} 380/* 381** SENDREPLY -- send a reply to the MTA 382** 383** Parameters: 384** r -- reply code 385** sd -- socket descriptor 386** timeout_ptr -- (ptr to) timeout to use for sending 387** ctx -- context structure 388** 389** Returns: 390** MI_SUCCESS/MI_FAILURE 391*/ 392 393static int 394sendreply(r, sd, timeout_ptr, ctx) 395 sfsistat r; 396 socket_t sd; 397 struct timeval *timeout_ptr; 398 SMFICTX_PTR ctx; 399{ 400 int ret = MI_SUCCESS; 401 402 switch (r) 403 { 404 case SMFIS_CONTINUE: 405 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 0); 406 break; 407 case SMFIS_TEMPFAIL: 408 case SMFIS_REJECT: 409 if (ctx->ctx_reply != NULL) 410 { 411 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_REPLYCODE, 412 ctx->ctx_reply, 413 strlen(ctx->ctx_reply) + 1); 414 free(ctx->ctx_reply); 415 ctx->ctx_reply = NULL; 416 } 417 else 418 { 419 ret = mi_wr_cmd(sd, timeout_ptr, r == SMFIS_REJECT ? 420 SMFIR_REJECT : SMFIR_TEMPFAIL, NULL, 0); 421 } 422 break; 423 case SMFIS_DISCARD: 424 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_DISCARD, NULL, 0); 425 break; 426 case SMFIS_ACCEPT: 427 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_ACCEPT, NULL, 0); 428 break; 429 case _SMFIS_OPTIONS: 430 { 431 char buf[MILTER_OPTLEN]; 432 mi_int32 v; 433 434 v = htonl(ctx->ctx_smfi->xxfi_version); 435 (void) memcpy(&(buf[0]), (void *) &v, MILTER_LEN_BYTES); 436 v = htonl(ctx->ctx_smfi->xxfi_flags); 437 (void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v, 438 MILTER_LEN_BYTES); 439 v = htonl(ctx->ctx_pflags); 440 (void) memcpy(&(buf[MILTER_LEN_BYTES * 2]), (void *) &v, 441 MILTER_LEN_BYTES); 442 ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG, buf, 443 MILTER_OPTLEN); 444 } 445 break; 446 default: /* don't send a reply */ 447 break; 448 } 449 return ret; 450} 451 452/* 453** CLR_MACROS -- clear set of macros starting from a given index 454** 455** Parameters: 456** ctx -- context structure 457** m -- index from which to clear all macros 458** 459** Returns: 460** None. 461*/ 462void 463mi_clr_macros(ctx, m) 464 SMFICTX_PTR ctx; 465 int m; 466{ 467 int i; 468 469 for (i = m; i < MAX_MACROS_ENTRIES; i++) 470 { 471 if (ctx->ctx_mac_ptr[i] != NULL) 472 { 473 free(ctx->ctx_mac_ptr[i]); 474 ctx->ctx_mac_ptr[i] = NULL; 475 } 476 if (ctx->ctx_mac_buf[i] != NULL) 477 { 478 free(ctx->ctx_mac_buf[i]); 479 ctx->ctx_mac_buf[i] = NULL; 480 } 481 } 482} 483/* 484** ST_OPTIONNEG -- negotiate options 485** 486** Parameters: 487** g -- generic argument structure 488** 489** Returns: 490** abort/send options/continue 491*/ 492 493static int 494st_optionneg(g) 495 genarg *g; 496{ 497 mi_int32 i, v; 498 499 if (g == NULL || g->a_ctx->ctx_smfi == NULL) 500 return SMFIS_CONTINUE; 501 mi_clr_macros(g->a_ctx, g->a_idx + 1); 502 503 /* check for minimum length */ 504 if (g->a_len < MILTER_OPTLEN) 505 { 506 smi_log(SMI_LOG_ERR, 507 "%s: st_optionneg[%d]: len too short %d < %d", 508 g->a_ctx->ctx_smfi->xxfi_name, 509 (int) g->a_ctx->ctx_id, g->a_len, 510 MILTER_OPTLEN); 511 return _SMFIS_ABORT; 512 } 513 514 (void) memcpy((void *) &i, (void *) &(g->a_buf[0]), 515 MILTER_LEN_BYTES); 516 v = ntohl(i); 517 if (v < g->a_ctx->ctx_smfi->xxfi_version) 518 { 519 /* hard failure for now! */ 520 smi_log(SMI_LOG_ERR, 521 "%s: st_optionneg[%d]: version mismatch MTA: %d < milter: %d", 522 g->a_ctx->ctx_smfi->xxfi_name, 523 (int) g->a_ctx->ctx_id, (int) v, 524 g->a_ctx->ctx_smfi->xxfi_version); 525 return _SMFIS_ABORT; 526 } 527 528 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES]), 529 MILTER_LEN_BYTES); 530 v = ntohl(i); 531 532 /* no flags? set to default value for V1 actions */ 533 if (v == 0) 534 v = SMFI_V1_ACTS; 535 i = g->a_ctx->ctx_smfi->xxfi_flags; 536 if ((v & i) != i) 537 { 538 smi_log(SMI_LOG_ERR, 539 "%s: st_optionneg[%d]: 0x%x does not fulfill action requirements 0x%x", 540 g->a_ctx->ctx_smfi->xxfi_name, 541 (int) g->a_ctx->ctx_id, v, i); 542 return _SMFIS_ABORT; 543 } 544 545 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES * 2]), 546 MILTER_LEN_BYTES); 547 v = ntohl(i); 548 549 /* no flags? set to default value for V1 protocol */ 550 if (v == 0) 551 v = SMFI_V1_PROT; 552 i = g->a_ctx->ctx_pflags; 553 if ((v & i) != i) 554 { 555 smi_log(SMI_LOG_ERR, 556 "%s: st_optionneg[%d]: 0x%x does not fulfill protocol requirements 0x%x", 557 g->a_ctx->ctx_smfi->xxfi_name, 558 (int) g->a_ctx->ctx_id, v, i); 559 return _SMFIS_ABORT; 560 } 561 562 return _SMFIS_OPTIONS; 563} 564/* 565** ST_CONNECTINFO -- receive connection information 566** 567** Parameters: 568** g -- generic argument structure 569** 570** Returns: 571** continue or filter-specified value 572*/ 573 574static int 575st_connectinfo(g) 576 genarg *g; 577{ 578 size_t l; 579 size_t i; 580 char *s, family; 581 unsigned short port = 0; 582 _SOCK_ADDR sockaddr; 583 sfsistat (*fi_connect) __P((SMFICTX *, char *, _SOCK_ADDR *)); 584 585 if (g == NULL) 586 return _SMFIS_ABORT; 587 mi_clr_macros(g->a_ctx, g->a_idx + 1); 588 if (g->a_ctx->ctx_smfi == NULL || 589 (fi_connect = g->a_ctx->ctx_smfi->xxfi_connect) == NULL) 590 return SMFIS_CONTINUE; 591 592 s = g->a_buf; 593 i = 0; 594 l = g->a_len; 595 while (s[i] != '\0' && i <= l) 596 ++i; 597 if (i >= l) 598 return _SMFIS_ABORT; 599 600 /* Move past trailing \0 in host string */ 601 i++; 602 family = s[i++]; 603 memset(&sockaddr, '\0', sizeof sockaddr); 604 if (family != SMFIA_UNKNOWN) 605 { 606 (void) memcpy((void *) &port, (void *) (s + i), 607 sizeof port); 608 port = ntohs(port); 609 if ((i += sizeof port) >= l) 610 { 611 smi_log(SMI_LOG_ERR, 612 "%s: connect[%d]: wrong len %d >= %d", 613 g->a_ctx->ctx_smfi->xxfi_name, 614 (int) g->a_ctx->ctx_id, i, l); 615 return _SMFIS_ABORT; 616 } 617# if NETINET 618 if (family == SMFIA_INET) 619 { 620 if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr) 621 == INADDR_NONE) 622 { 623 smi_log(SMI_LOG_ERR, 624 "%s: connect[%d]: inet_aton failed", 625 g->a_ctx->ctx_smfi->xxfi_name, 626 (int) g->a_ctx->ctx_id); 627 return _SMFIS_ABORT; 628 } 629 sockaddr.sa.sa_family = AF_INET; 630 if (port > 0) 631 sockaddr.sin.sin_port = port; 632 } 633 else 634# endif /* NETINET */ 635# if NETINET6 636 if (family == SMFIA_INET6) 637 { 638 if (mi_inet_pton(AF_INET6, s + i, 639 &sockaddr.sin6.sin6_addr) != 1) 640 { 641 smi_log(SMI_LOG_ERR, 642 "%s: connect[%d]: mi_inet_pton failed", 643 g->a_ctx->ctx_smfi->xxfi_name, 644 (int) g->a_ctx->ctx_id); 645 return _SMFIS_ABORT; 646 } 647 sockaddr.sa.sa_family = AF_INET6; 648 if (port > 0) 649 sockaddr.sin6.sin6_port = port; 650 } 651 else 652# endif /* NETINET6 */ 653# if NETUNIX 654 if (family == SMFIA_UNIX) 655 { 656 if (sm_strlcpy(sockaddr.sunix.sun_path, s + i, 657 sizeof sockaddr.sunix.sun_path) >= 658 sizeof sockaddr.sunix.sun_path) 659 { 660 smi_log(SMI_LOG_ERR, 661 "%s: connect[%d]: path too long", 662 g->a_ctx->ctx_smfi->xxfi_name, 663 (int) g->a_ctx->ctx_id); 664 return _SMFIS_ABORT; 665 } 666 sockaddr.sunix.sun_family = AF_UNIX; 667 } 668 else 669# endif /* NETUNIX */ 670 { 671 smi_log(SMI_LOG_ERR, 672 "%s: connect[%d]: unknown family %d", 673 g->a_ctx->ctx_smfi->xxfi_name, 674 (int) g->a_ctx->ctx_id, family); 675 return _SMFIS_ABORT; 676 } 677 } 678 return (*fi_connect)(g->a_ctx, g->a_buf, 679 family != SMFIA_UNKNOWN ? &sockaddr : NULL); 680} 681/* 682** ST_EOH -- end of headers 683** 684** Parameters: 685** g -- generic argument structure 686** 687** Returns: 688** continue or filter-specified value 689*/ 690 691static int 692st_eoh(g) 693 genarg *g; 694{ 695 sfsistat (*fi_eoh) __P((SMFICTX *)); 696 697 if (g == NULL) 698 return _SMFIS_ABORT; 699 if (g->a_ctx->ctx_smfi != NULL && 700 (fi_eoh = g->a_ctx->ctx_smfi->xxfi_eoh) != NULL) 701 return (*fi_eoh)(g->a_ctx); 702 return SMFIS_CONTINUE; 703} 704/* 705** ST_HELO -- helo/ehlo command 706** 707** Parameters: 708** g -- generic argument structure 709** 710** Returns: 711** continue or filter-specified value 712*/ 713static int 714st_helo(g) 715 genarg *g; 716{ 717 sfsistat (*fi_helo) __P((SMFICTX *, char *)); 718 719 if (g == NULL) 720 return _SMFIS_ABORT; 721 mi_clr_macros(g->a_ctx, g->a_idx + 1); 722 if (g->a_ctx->ctx_smfi != NULL && 723 (fi_helo = g->a_ctx->ctx_smfi->xxfi_helo) != NULL) 724 return (*fi_helo)(g->a_ctx, g->a_buf); 725 return SMFIS_CONTINUE; 726} 727/* 728** ST_HEADER -- header line 729** 730** Parameters: 731** g -- generic argument structure 732** 733** Returns: 734** continue or filter-specified value 735*/ 736 737static int 738st_header(g) 739 genarg *g; 740{ 741 char *hf, *hv; 742 sfsistat (*fi_header) __P((SMFICTX *, char *, char *)); 743 744 if (g == NULL) 745 return _SMFIS_ABORT; 746 if (g->a_ctx->ctx_smfi == NULL || 747 (fi_header = g->a_ctx->ctx_smfi->xxfi_header) == NULL) 748 return SMFIS_CONTINUE; 749 if (dec_arg2(g->a_buf, g->a_len, &hf, &hv) == MI_SUCCESS) 750 return (*fi_header)(g->a_ctx, hf, hv); 751 else 752 return _SMFIS_ABORT; 753} 754 755#define ARGV_FCT(lf, rf, idx) \ 756 char **argv; \ 757 sfsistat (*lf) __P((SMFICTX *, char **)); \ 758 int r; \ 759 \ 760 if (g == NULL) \ 761 return _SMFIS_ABORT; \ 762 mi_clr_macros(g->a_ctx, g->a_idx + 1); \ 763 if (g->a_ctx->ctx_smfi == NULL || \ 764 (lf = g->a_ctx->ctx_smfi->rf) == NULL) \ 765 return SMFIS_CONTINUE; \ 766 if ((argv = dec_argv(g->a_buf, g->a_len)) == NULL) \ 767 return _SMFIS_ABORT; \ 768 r = (*lf)(g->a_ctx, argv); \ 769 free(argv); \ 770 return r; 771 772/* 773** ST_SENDER -- MAIL FROM command 774** 775** Parameters: 776** g -- generic argument structure 777** 778** Returns: 779** continue or filter-specified value 780*/ 781 782static int 783st_sender(g) 784 genarg *g; 785{ 786 ARGV_FCT(fi_envfrom, xxfi_envfrom, CI_MAIL) 787} 788/* 789** ST_RCPT -- RCPT TO command 790** 791** Parameters: 792** g -- generic argument structure 793** 794** Returns: 795** continue or filter-specified value 796*/ 797 798static int 799st_rcpt(g) 800 genarg *g; 801{ 802 ARGV_FCT(fi_envrcpt, xxfi_envrcpt, CI_RCPT) 803} 804/* 805** ST_MACROS -- deal with macros received from the MTA 806** 807** Parameters: 808** g -- generic argument structure 809** 810** Returns: 811** continue/keep 812** 813** Side effects: 814** set pointer in macro array to current values. 815*/ 816 817static int 818st_macros(g) 819 genarg *g; 820{ 821 int i; 822 char **argv; 823 824 if (g == NULL || g->a_len < 1) 825 return _SMFIS_FAIL; 826 if ((argv = dec_argv(g->a_buf + 1, g->a_len - 1)) == NULL) 827 return _SMFIS_FAIL; 828 switch (g->a_buf[0]) 829 { 830 case SMFIC_CONNECT: 831 i = CI_CONN; 832 break; 833 case SMFIC_HELO: 834 i = CI_HELO; 835 break; 836 case SMFIC_MAIL: 837 i = CI_MAIL; 838 break; 839 case SMFIC_RCPT: 840 i = CI_RCPT; 841 break; 842 default: 843 free(argv); 844 return _SMFIS_FAIL; 845 } 846 if (g->a_ctx->ctx_mac_ptr[i] != NULL) 847 free(g->a_ctx->ctx_mac_ptr[i]); 848 if (g->a_ctx->ctx_mac_buf[i] != NULL) 849 free(g->a_ctx->ctx_mac_buf[i]); 850 g->a_ctx->ctx_mac_ptr[i] = argv; 851 g->a_ctx->ctx_mac_buf[i] = g->a_buf; 852 return _SMFIS_KEEP; 853} 854/* 855** ST_QUIT -- quit command 856** 857** Parameters: 858** g -- generic argument structure 859** 860** Returns: 861** noreply 862*/ 863 864static int 865st_quit(g) 866 genarg *g; 867{ 868 return _SMFIS_NOREPLY; 869} 870/* 871** ST_BODYCHUNK -- deal with a piece of the mail body 872** 873** Parameters: 874** g -- generic argument structure 875** 876** Returns: 877** continue or filter-specified value 878*/ 879 880static int 881st_bodychunk(g) 882 genarg *g; 883{ 884 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t)); 885 886 if (g == NULL) 887 return _SMFIS_ABORT; 888 if (g->a_ctx->ctx_smfi != NULL && 889 (fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL) 890 return (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf, 891 g->a_len); 892 return SMFIS_CONTINUE; 893} 894/* 895** ST_BODYEND -- deal with the last piece of the mail body 896** 897** Parameters: 898** g -- generic argument structure 899** 900** Returns: 901** continue or filter-specified value 902** 903** Side effects: 904** sends a reply for the body part (if non-empty). 905*/ 906 907static int 908st_bodyend(g) 909 genarg *g; 910{ 911 sfsistat r; 912 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t)); 913 sfsistat (*fi_eom) __P((SMFICTX *)); 914 915 if (g == NULL) 916 return _SMFIS_ABORT; 917 r = SMFIS_CONTINUE; 918 if (g->a_ctx->ctx_smfi != NULL) 919 { 920 if ((fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL && 921 g->a_len > 0) 922 { 923 socket_t sd; 924 struct timeval timeout; 925 926 timeout.tv_sec = g->a_ctx->ctx_timeout; 927 timeout.tv_usec = 0; 928 sd = g->a_ctx->ctx_sd; 929 r = (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf, 930 g->a_len); 931 if (r != SMFIS_CONTINUE && 932 sendreply(r, sd, &timeout, g->a_ctx) != MI_SUCCESS) 933 return _SMFIS_ABORT; 934 } 935 } 936 if (r == SMFIS_CONTINUE && 937 (fi_eom = g->a_ctx->ctx_smfi->xxfi_eom) != NULL) 938 return (*fi_eom)(g->a_ctx); 939 return r; 940} 941/* 942** ST_ABORTFCT -- deal with aborts 943** 944** Parameters: 945** g -- generic argument structure 946** 947** Returns: 948** abort or filter-specified value 949*/ 950 951static int 952st_abortfct(g) 953 genarg *g; 954{ 955 sfsistat (*fi_abort) __P((SMFICTX *)); 956 957 if (g == NULL) 958 return _SMFIS_ABORT; 959 if (g != NULL && g->a_ctx->ctx_smfi != NULL && 960 (fi_abort = g->a_ctx->ctx_smfi->xxfi_abort) != NULL) 961 (void) (*fi_abort)(g->a_ctx); 962 return _SMFIS_NOREPLY; 963} 964/* 965** TRANS_OK -- is the state transition ok? 966** 967** Parameters: 968** old -- old state 969** new -- new state 970** 971** Returns: 972** state transition ok 973*/ 974 975static bool 976trans_ok(old, new) 977 int old, new; 978{ 979 int s, n; 980 981 s = old; 982 do 983 { 984 /* is this state transition allowed? */ 985 if ((MASK(new) & next_states[s]) != 0) 986 return true; 987 988 /* 989 ** no: try next state; 990 ** this works since the relevant states are ordered 991 ** strict sequentially 992 */ 993 994 n = s + 1; 995 996 /* 997 ** can we actually "skip" this state? 998 ** see fix_stm() which sets this bit for those 999 ** states which the filter program is not interested in 1000 */ 1001 1002 if (bitset(NX_SKIP, next_states[n])) 1003 s = n; 1004 else 1005 return false; 1006 } while (s <= ST_LAST); 1007 return false; 1008} 1009/* 1010** FIX_STM -- add "skip" bits to the state transition table 1011** 1012** Parameters: 1013** ctx -- context structure 1014** 1015** Returns: 1016** None. 1017** 1018** Side effects: 1019** may change state transition table. 1020*/ 1021 1022static void 1023fix_stm(ctx) 1024 SMFICTX_PTR ctx; 1025{ 1026 unsigned long fl; 1027 1028 if (ctx == NULL || ctx->ctx_smfi == NULL) 1029 return; 1030 fl = ctx->ctx_pflags; 1031 if (bitset(SMFIP_NOCONNECT, fl)) 1032 next_states[ST_CONN] |= NX_SKIP; 1033 if (bitset(SMFIP_NOHELO, fl)) 1034 next_states[ST_HELO] |= NX_SKIP; 1035 if (bitset(SMFIP_NOMAIL, fl)) 1036 next_states[ST_MAIL] |= NX_SKIP; 1037 if (bitset(SMFIP_NORCPT, fl)) 1038 next_states[ST_RCPT] |= NX_SKIP; 1039 if (bitset(SMFIP_NOHDRS, fl)) 1040 next_states[ST_HDRS] |= NX_SKIP; 1041 if (bitset(SMFIP_NOEOH, fl)) 1042 next_states[ST_EOHS] |= NX_SKIP; 1043 if (bitset(SMFIP_NOBODY, fl)) 1044 next_states[ST_BODY] |= NX_SKIP; 1045} 1046/* 1047** DEC_ARGV -- split a buffer into a list of strings, NULL terminated 1048** 1049** Parameters: 1050** buf -- buffer with several strings 1051** len -- length of buffer 1052** 1053** Returns: 1054** array of pointers to the individual strings 1055*/ 1056 1057static char ** 1058dec_argv(buf, len) 1059 char *buf; 1060 size_t len; 1061{ 1062 char **s; 1063 size_t i; 1064 int elem, nelem; 1065 1066 nelem = 0; 1067 for (i = 0; i < len; i++) 1068 { 1069 if (buf[i] == '\0') 1070 ++nelem; 1071 } 1072 if (nelem == 0) 1073 return NULL; 1074 1075 /* last entry is only for the name */ 1076 s = (char **)malloc((nelem + 1) * (sizeof *s)); 1077 if (s == NULL) 1078 return NULL; 1079 s[0] = buf; 1080 for (i = 0, elem = 0; i < len && elem < nelem; i++) 1081 { 1082 if (buf[i] == '\0') 1083 s[++elem] = &(buf[i + 1]); 1084 } 1085 1086 /* overwrite last entry */ 1087 s[elem] = NULL; 1088 return s; 1089} 1090/* 1091** DEC_ARG2 -- split a buffer into two strings 1092** 1093** Parameters: 1094** buf -- buffer with two strings 1095** len -- length of buffer 1096** s1,s2 -- pointer to result strings 1097** 1098** Returns: 1099** MI_FAILURE/MI_SUCCESS 1100*/ 1101 1102static int 1103dec_arg2(buf, len, s1, s2) 1104 char *buf; 1105 size_t len; 1106 char **s1; 1107 char **s2; 1108{ 1109 size_t i; 1110 1111 *s1 = buf; 1112 for (i = 1; i < len && buf[i] != '\0'; i++) 1113 continue; 1114 if (i >= len - 1) 1115 return MI_FAILURE; 1116 *s2 = buf + i + 1; 1117 return MI_SUCCESS; 1118} 1119/* 1120** SENDOK -- is it ok for the filter to send stuff to the MTA? 1121** 1122** Parameters: 1123** ctx -- context structure 1124** flag -- flag to check 1125** 1126** Returns: 1127** sending allowed (in current state) 1128*/ 1129 1130bool 1131mi_sendok(ctx, flag) 1132 SMFICTX_PTR ctx; 1133 int flag; 1134{ 1135 if (ctx == NULL || ctx->ctx_smfi == NULL) 1136 return false; 1137 1138 /* did the milter request this operation? */ 1139 if (flag != 0 && !bitset(flag, ctx->ctx_smfi->xxfi_flags)) 1140 return false; 1141 1142 /* are we in the correct state? It must be "End of Message". */ 1143 return ctx->ctx_state == ST_ENDM; 1144} 1145