1 /*
2 * Copyright (c) 1999-2004, 2006-2008 Proofpoint, 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 8.168 2013-11-22 20:51:36 ca Exp $")
13
14 #include "libmilter.h"
15
16 #if NETINET || NETINET6
17 # include <arpa/inet.h>
18 #endif
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_BUF 0
46 #define CM_NULLOK 1
47
48 /* possible values for cm_todo */
49 #define CT_CONT 0x0000 /* continue reading commands */
50 #define CT_IGNO 0x0001 /* continue even when error */
51
52 /* not needed right now, done via return code instead */
53 #define CT_KEEP 0x0004 /* keep buffer (contains symbols) */
54 #define CT_END 0x0008 /* last command of session, stop replying */
55
56 /* index in macro array: macros only for these commands */
57 #define CI_NONE (-1)
58 #define CI_CONN 0
59 #define CI_HELO 1
60 #define CI_MAIL 2
61 #define CI_RCPT 3
62 #define CI_DATA 4
63 #define CI_EOH 5
64 #define CI_EOM 6
65 #define CI_LAST CI_EOM
66 #if CI_LAST < CI_DATA
67 # error "do not compile with CI_LAST < CI_DATA"
68 #endif
69 #if CI_LAST < CI_EOM
70 # error "do not compile with CI_LAST < CI_EOM"
71 #endif
72 #if CI_LAST < CI_EOH
73 # error "do not compile with CI_LAST < CI_EOH"
74 #endif
75 #if CI_LAST < CI_RCPT
76 # error "do not compile with CI_LAST < CI_RCPT"
77 #endif
78 #if CI_LAST < CI_MAIL
79 # error "do not compile with CI_LAST < CI_MAIL"
80 #endif
81 #if CI_LAST < CI_HELO
82 # error "do not compile with CI_LAST < CI_HELO"
83 #endif
84 #if CI_LAST < CI_CONN
85 # error "do not compile with CI_LAST < CI_CONN"
86 #endif
87 #if CI_LAST >= MAX_MACROS_ENTRIES
88 # error "do not compile with CI_LAST >= MAX_MACROS_ENTRIES"
89 #endif
90
91 /* function prototypes */
92 static int st_abortfct __P((genarg *));
93 static int st_macros __P((genarg *));
94 static int st_optionneg __P((genarg *));
95 static int st_bodychunk __P((genarg *));
96 static int st_connectinfo __P((genarg *));
97 static int st_bodyend __P((genarg *));
98 static int st_helo __P((genarg *));
99 static int st_header __P((genarg *));
100 static int st_sender __P((genarg *));
101 static int st_rcpt __P((genarg *));
102 static int st_unknown __P((genarg *));
103 static int st_data __P((genarg *));
104 static int st_eoh __P((genarg *));
105 static int st_quit __P((genarg *));
106 static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR));
107 static void fix_stm __P((SMFICTX_PTR));
108 static bool trans_ok __P((int, int));
109 static char **dec_argv __P((char *, size_t));
110 static int dec_arg2 __P((char *, size_t, char **, char **));
111 static void mi_clr_symlist __P((SMFICTX_PTR));
112
113 #if _FFR_WORKERS_POOL
114 static bool mi_rd_socket_ready __P((int));
115 #endif
116
117 /* states */
118 #define ST_NONE (-1)
119 #define ST_INIT 0 /* initial state */
120 #define ST_OPTS 1 /* option negotiation */
121 #define ST_CONN 2 /* connection info */
122 #define ST_HELO 3 /* helo */
123 #define ST_MAIL 4 /* mail from */
124 #define ST_RCPT 5 /* rcpt to */
125 #define ST_DATA 6 /* data */
126 #define ST_HDRS 7 /* headers */
127 #define ST_EOHS 8 /* end of headers */
128 #define ST_BODY 9 /* body */
129 #define ST_ENDM 10 /* end of message */
130 #define ST_QUIT 11 /* quit */
131 #define ST_ABRT 12 /* abort */
132 #define ST_UNKN 13 /* unknown SMTP command */
133 #define ST_Q_NC 14 /* quit, new connection follows */
134 #define ST_LAST ST_Q_NC /* last valid state */
135 #define ST_SKIP 16 /* not a state but required for the state table */
136
137 /* in a mail transaction? must be before eom according to spec. */
138 #define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM)
139
140 /*
141 ** set of next states
142 ** each state (ST_*) corresponds to bit in an int value (1 << state)
143 ** each state has a set of allowed transitions ('or' of bits of states)
144 ** so a state transition is valid if the mask of the next state
145 ** is set in the NX_* value
146 ** this function is coded in trans_ok(), see below.
147 */
148
149 #define MI_MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */
150 #define NX_INIT (MI_MASK(ST_OPTS))
151 #define NX_OPTS (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN))
152 #define NX_CONN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN))
153 #define NX_HELO (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN))
154 #define NX_MAIL (MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN))
155 #define NX_RCPT (MI_MASK(ST_HDRS) | MI_MASK(ST_EOHS) | MI_MASK(ST_DATA) | \
156 MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | \
157 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | MI_MASK(ST_UNKN))
158 #define NX_DATA (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT))
159 #define NX_HDRS (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT))
160 #define NX_EOHS (MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | MI_MASK(ST_ABRT))
161 #define NX_BODY (MI_MASK(ST_ENDM) | MI_MASK(ST_BODY) | MI_MASK(ST_ABRT))
162 #define NX_ENDM (MI_MASK(ST_QUIT) | MI_MASK(ST_MAIL) | MI_MASK(ST_UNKN) | \
163 MI_MASK(ST_Q_NC))
164 #define NX_QUIT 0
165 #define NX_ABRT 0
166 #define NX_UNKN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL) | \
167 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT) | \
168 MI_MASK(ST_DATA) | \
169 MI_MASK(ST_BODY) | MI_MASK(ST_UNKN) | \
170 MI_MASK(ST_ABRT) | MI_MASK(ST_QUIT) | MI_MASK(ST_Q_NC))
171 #define NX_Q_NC (MI_MASK(ST_CONN) | MI_MASK(ST_UNKN))
172 #define NX_SKIP MI_MASK(ST_SKIP)
173
174 static int next_states[] =
175 {
176 NX_INIT
177 , NX_OPTS
178 , NX_CONN
179 , NX_HELO
180 , NX_MAIL
181 , NX_RCPT
182 , NX_DATA
183 , NX_HDRS
184 , NX_EOHS
185 , NX_BODY
186 , NX_ENDM
187 , NX_QUIT
188 , NX_ABRT
189 , NX_UNKN
190 , NX_Q_NC
191 };
192
193 #define SIZE_NEXT_STATES (sizeof(next_states) / sizeof(next_states[0]))
194
195 /* commands received by milter */
196 static cmdfct cmds[] =
197 {
198 {SMFIC_ABORT, CM_NULLOK, ST_ABRT, CT_CONT, CI_NONE, st_abortfct}
199 , {SMFIC_MACRO, CM_BUF, ST_NONE, CT_KEEP, CI_NONE, st_macros }
200 , {SMFIC_BODY, CM_BUF, ST_BODY, CT_CONT, CI_NONE, st_bodychunk}
201 , {SMFIC_CONNECT, CM_BUF, ST_CONN, CT_CONT, CI_CONN, st_connectinfo}
202 , {SMFIC_BODYEOB, CM_NULLOK, ST_ENDM, CT_CONT, CI_EOM, st_bodyend }
203 , {SMFIC_HELO, CM_BUF, ST_HELO, CT_CONT, CI_HELO, st_helo }
204 , {SMFIC_HEADER, CM_BUF, ST_HDRS, CT_CONT, CI_NONE, st_header }
205 , {SMFIC_MAIL, CM_BUF, ST_MAIL, CT_CONT, CI_MAIL, st_sender }
206 , {SMFIC_OPTNEG, CM_BUF, ST_OPTS, CT_CONT, CI_NONE, st_optionneg}
207 , {SMFIC_EOH, CM_NULLOK, ST_EOHS, CT_CONT, CI_EOH, st_eoh }
208 , {SMFIC_QUIT, CM_NULLOK, ST_QUIT, CT_END, CI_NONE, st_quit }
209 , {SMFIC_DATA, CM_NULLOK, ST_DATA, CT_CONT, CI_DATA, st_data }
210 , {SMFIC_RCPT, CM_BUF, ST_RCPT, CT_IGNO, CI_RCPT, st_rcpt }
211 , {SMFIC_UNKNOWN, CM_BUF, ST_UNKN, CT_IGNO, CI_NONE, st_unknown }
212 , {SMFIC_QUIT_NC, CM_NULLOK, ST_Q_NC, CT_CONT, CI_NONE, st_quit }
213 };
214
215 /*
216 ** Additional (internal) reply codes;
217 ** must be coordinated wit libmilter/mfapi.h
218 */
219
220 #define _SMFIS_KEEP 20
221 #define _SMFIS_ABORT 21
222 #define _SMFIS_OPTIONS 22
223 #define _SMFIS_NOREPLY SMFIS_NOREPLY
224 #define _SMFIS_FAIL (-1)
225 #define _SMFIS_NONE (-2)
226
227 /*
228 ** MI_ENGINE -- receive commands and process them
229 **
230 ** Parameters:
231 ** ctx -- context structure
232 **
233 ** Returns:
234 ** MI_FAILURE/MI_SUCCESS
235 */
236
237 int
mi_engine(ctx)238 mi_engine(ctx)
239 SMFICTX_PTR ctx;
240 {
241 size_t len;
242 int i;
243 socket_t sd;
244 int ret = MI_SUCCESS;
245 int ncmds = sizeof(cmds) / sizeof(cmdfct);
246 int curstate = ST_INIT;
247 int newstate;
248 bool call_abort;
249 sfsistat r;
250 char cmd;
251 char *buf = NULL;
252 genarg arg;
253 struct timeval timeout;
254 int (*f) __P((genarg *));
255 sfsistat (*fi_abort) __P((SMFICTX *));
256 sfsistat (*fi_close) __P((SMFICTX *));
257
258 arg.a_ctx = ctx;
259 sd = ctx->ctx_sd;
260 fi_abort = ctx->ctx_smfi->xxfi_abort;
261 #if _FFR_WORKERS_POOL
262 curstate = ctx->ctx_state;
263 if (curstate == ST_INIT)
264 {
265 mi_clr_macros(ctx, 0);
266 fix_stm(ctx);
267 }
268 #else /* _FFR_WORKERS_POOL */
269 mi_clr_macros(ctx, 0);
270 fix_stm(ctx);
271 #endif /* _FFR_WORKERS_POOL */
272 r = _SMFIS_NONE;
273 do
274 {
275 /* call abort only if in a mail transaction */
276 call_abort = ST_IN_MAIL(curstate);
277 timeout.tv_sec = ctx->ctx_timeout;
278 timeout.tv_usec = 0;
279 if (mi_stop() == MILTER_ABRT)
280 {
281 if (ctx->ctx_dbg > 3)
282 sm_dprintf("[%lu] milter_abort\n",
283 (long) ctx->ctx_id);
284 ret = MI_FAILURE;
285 break;
286 }
287
288 /*
289 ** Notice: buf is allocated by mi_rd_cmd() and it will
290 ** usually be free()d after it has been used in f().
291 ** However, if the function returns _SMFIS_KEEP then buf
292 ** contains macros and will not be free()d.
293 ** Hence r must be set to _SMFIS_NONE if a new buf is
294 ** allocated to avoid problem with housekeeping, esp.
295 ** if the code "break"s out of the loop.
296 */
297
298 #if _FFR_WORKERS_POOL
299 /* Is the socket ready to be read ??? */
300 if (!mi_rd_socket_ready(sd))
301 {
302 ret = MI_CONTINUE;
303 break;
304 }
305 #endif /* _FFR_WORKERS_POOL */
306
307 r = _SMFIS_NONE;
308 if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len,
309 ctx->ctx_smfi->xxfi_name)) == NULL &&
310 cmd < SMFIC_VALIDCMD)
311 {
312 if (ctx->ctx_dbg > 5)
313 sm_dprintf("[%lu] mi_engine: mi_rd_cmd error (%x)\n",
314 (long) ctx->ctx_id, (int) cmd);
315
316 /*
317 ** eof is currently treated as failure ->
318 ** abort() instead of close(), otherwise use:
319 ** if (cmd != SMFIC_EOF)
320 */
321
322 ret = MI_FAILURE;
323 break;
324 }
325 if (ctx->ctx_dbg > 4)
326 sm_dprintf("[%lu] got cmd '%c' len %d\n",
327 (long) ctx->ctx_id, cmd, (int) len);
328 for (i = 0; i < ncmds; i++)
329 {
330 if (cmd == cmds[i].cm_cmd)
331 break;
332 }
333 if (i >= ncmds)
334 {
335 /* unknown command */
336 if (ctx->ctx_dbg > 1)
337 sm_dprintf("[%lu] cmd '%c' unknown\n",
338 (long) ctx->ctx_id, cmd);
339 ret = MI_FAILURE;
340 break;
341 }
342 if ((f = cmds[i].cm_fct) == NULL)
343 {
344 /* stop for now */
345 if (ctx->ctx_dbg > 1)
346 sm_dprintf("[%lu] cmd '%c' not impl\n",
347 (long) ctx->ctx_id, cmd);
348 ret = MI_FAILURE;
349 break;
350 }
351
352 /* is new state ok? */
353 newstate = cmds[i].cm_next;
354 if (ctx->ctx_dbg > 5)
355 sm_dprintf("[%lu] cur %x new %x nextmask %x\n",
356 (long) ctx->ctx_id,
357 curstate, newstate, next_states[curstate]);
358
359 if (newstate != ST_NONE && !trans_ok(curstate, newstate))
360 {
361 if (ctx->ctx_dbg > 1)
362 sm_dprintf("[%lu] abort: cur %d (%x) new %d (%x) next %x\n",
363 (long) ctx->ctx_id,
364 curstate, MI_MASK(curstate),
365 newstate, MI_MASK(newstate),
366 next_states[curstate]);
367
368 /* call abort only if in a mail transaction */
369 if (fi_abort != NULL && call_abort)
370 (void) (*fi_abort)(ctx);
371
372 /*
373 ** try to reach the new state from HELO
374 ** if it can't be reached, ignore the command.
375 */
376
377 curstate = ST_HELO;
378 if (!trans_ok(curstate, newstate))
379 {
380 if (buf != NULL)
381 {
382 free(buf);
383 buf = NULL;
384 }
385 continue;
386 }
387 }
388 if (cmds[i].cm_argt != CM_NULLOK && buf == NULL)
389 {
390 /* stop for now */
391 if (ctx->ctx_dbg > 1)
392 sm_dprintf("[%lu] cmd='%c', buf=NULL\n",
393 (long) ctx->ctx_id, cmd);
394 ret = MI_FAILURE;
395 break;
396 }
397 arg.a_len = len;
398 arg.a_buf = buf;
399 if (newstate != ST_NONE)
400 {
401 curstate = newstate;
402 ctx->ctx_state = curstate;
403 }
404 arg.a_idx = cmds[i].cm_macros;
405 call_abort = ST_IN_MAIL(curstate);
406
407 /* call function to deal with command */
408 MI_MONITOR_BEGIN(ctx, cmd);
409 r = (*f)(&arg);
410 MI_MONITOR_END(ctx, cmd);
411 if (r != _SMFIS_KEEP && buf != NULL)
412 {
413 free(buf);
414 buf = NULL;
415 }
416 if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS)
417 {
418 ret = MI_FAILURE;
419 break;
420 }
421
422 if (r == SMFIS_ACCEPT)
423 {
424 /* accept mail, no further actions taken */
425 curstate = ST_HELO;
426 }
427 else if (r == SMFIS_REJECT || r == SMFIS_DISCARD ||
428 r == SMFIS_TEMPFAIL)
429 {
430 /*
431 ** further actions depend on current state
432 ** if the IGNO bit is set: "ignore" the error,
433 ** i.e., stay in the current state
434 */
435 if (!bitset(CT_IGNO, cmds[i].cm_todo))
436 curstate = ST_HELO;
437 }
438 else if (r == _SMFIS_ABORT)
439 {
440 if (ctx->ctx_dbg > 5)
441 sm_dprintf("[%lu] function returned abort\n",
442 (long) ctx->ctx_id);
443 ret = MI_FAILURE;
444 break;
445 }
446 } while (!bitset(CT_END, cmds[i].cm_todo));
447
448 ctx->ctx_state = curstate;
449
450 if (ret == MI_FAILURE)
451 {
452 /* call abort only if in a mail transaction */
453 if (fi_abort != NULL && call_abort)
454 (void) (*fi_abort)(ctx);
455 }
456
457 /* has close been called? */
458 if (ctx->ctx_state != ST_QUIT
459 #if _FFR_WORKERS_POOL
460 && ret != MI_CONTINUE
461 #endif
462 )
463 {
464 if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL)
465 (void) (*fi_close)(ctx);
466 }
467 if (r != _SMFIS_KEEP && buf != NULL)
468 free(buf);
469 #if !_FFR_WORKERS_POOL
470 mi_clr_macros(ctx, 0);
471 #endif
472 return ret;
473 }
474
475 static size_t milter_addsymlist __P((SMFICTX_PTR, char *, char **));
476
477 static size_t
milter_addsymlist(ctx,buf,newbuf)478 milter_addsymlist(ctx, buf, newbuf)
479 SMFICTX_PTR ctx;
480 char *buf;
481 char **newbuf;
482 {
483 size_t len;
484 int i;
485 mi_int32 v;
486 char *buffer;
487
488 SM_ASSERT(ctx != NULL);
489 SM_ASSERT(buf != NULL);
490 SM_ASSERT(newbuf != NULL);
491 len = 0;
492 for (i = 0; i < MAX_MACROS_ENTRIES; i++)
493 {
494 if (ctx->ctx_mac_list[i] != NULL)
495 {
496 len += strlen(ctx->ctx_mac_list[i]) + 1 +
497 MILTER_LEN_BYTES;
498 }
499 }
500 if (len > 0)
501 {
502 size_t offset;
503
504 SM_ASSERT(len + MILTER_OPTLEN > len);
505 len += MILTER_OPTLEN;
506 buffer = malloc(len);
507 if (buffer != NULL)
508 {
509 (void) memcpy(buffer, buf, MILTER_OPTLEN);
510 offset = MILTER_OPTLEN;
511 for (i = 0; i < MAX_MACROS_ENTRIES; i++)
512 {
513 size_t l;
514
515 if (ctx->ctx_mac_list[i] == NULL)
516 continue;
517
518 SM_ASSERT(offset + MILTER_LEN_BYTES < len);
519 v = htonl(i);
520 (void) memcpy(buffer + offset, (void *) &v,
521 MILTER_LEN_BYTES);
522 offset += MILTER_LEN_BYTES;
523 l = strlen(ctx->ctx_mac_list[i]) + 1;
524 SM_ASSERT(offset + l <= len);
525 (void) memcpy(buffer + offset,
526 ctx->ctx_mac_list[i], l);
527 offset += l;
528 }
529 }
530 else
531 {
532 /* oops ... */
533 }
534 }
535 else
536 {
537 len = MILTER_OPTLEN;
538 buffer = buf;
539 }
540 *newbuf = buffer;
541 return len;
542 }
543
544 /*
545 ** GET_NR_BIT -- get "no reply" bit matching state
546 **
547 ** Parameters:
548 ** state -- current protocol stage
549 **
550 ** Returns:
551 ** 0: no matching bit
552 ** >0: the matching "no reply" bit
553 */
554
555 static unsigned long get_nr_bit __P((int));
556
557 static unsigned long
get_nr_bit(state)558 get_nr_bit(state)
559 int state;
560 {
561 unsigned long bit;
562
563 switch (state)
564 {
565 case ST_CONN:
566 bit = SMFIP_NR_CONN;
567 break;
568 case ST_HELO:
569 bit = SMFIP_NR_HELO;
570 break;
571 case ST_MAIL:
572 bit = SMFIP_NR_MAIL;
573 break;
574 case ST_RCPT:
575 bit = SMFIP_NR_RCPT;
576 break;
577 case ST_DATA:
578 bit = SMFIP_NR_DATA;
579 break;
580 case ST_UNKN:
581 bit = SMFIP_NR_UNKN;
582 break;
583 case ST_HDRS:
584 bit = SMFIP_NR_HDR;
585 break;
586 case ST_EOHS:
587 bit = SMFIP_NR_EOH;
588 break;
589 case ST_BODY:
590 bit = SMFIP_NR_BODY;
591 break;
592 default:
593 bit = 0;
594 break;
595 }
596 return bit;
597 }
598
599 /*
600 ** SENDREPLY -- send a reply to the MTA
601 **
602 ** Parameters:
603 ** r -- reply code
604 ** sd -- socket descriptor
605 ** timeout_ptr -- (ptr to) timeout to use for sending
606 ** ctx -- context structure
607 **
608 ** Returns:
609 ** MI_SUCCESS/MI_FAILURE
610 */
611
612 static int
sendreply(r,sd,timeout_ptr,ctx)613 sendreply(r, sd, timeout_ptr, ctx)
614 sfsistat r;
615 socket_t sd;
616 struct timeval *timeout_ptr;
617 SMFICTX_PTR ctx;
618 {
619 int ret;
620 unsigned long bit;
621
622 ret = MI_SUCCESS;
623
624 bit = get_nr_bit(ctx->ctx_state);
625 if (bit != 0 && (ctx->ctx_pflags & bit) != 0 && r != SMFIS_NOREPLY)
626 {
627 if (r >= SMFIS_CONTINUE && r < _SMFIS_KEEP)
628 {
629 /* milter said it wouldn't reply, but it lied... */
630 smi_log(SMI_LOG_ERR,
631 "%s: milter claimed not to reply in state %d but did anyway %d",
632 ctx->ctx_smfi->xxfi_name,
633 ctx->ctx_state, r);
634
635 }
636
637 /*
638 ** Force specified behavior, otherwise libmilter
639 ** and MTA will fail to communicate properly.
640 */
641
642 switch (r)
643 {
644 case SMFIS_CONTINUE:
645 case SMFIS_TEMPFAIL:
646 case SMFIS_REJECT:
647 case SMFIS_DISCARD:
648 case SMFIS_ACCEPT:
649 case SMFIS_SKIP:
650 case _SMFIS_OPTIONS:
651 r = SMFIS_NOREPLY;
652 break;
653 }
654 }
655
656 switch (r)
657 {
658 case SMFIS_CONTINUE:
659 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 0);
660 break;
661 case SMFIS_TEMPFAIL:
662 case SMFIS_REJECT:
663 if (ctx->ctx_reply != NULL &&
664 ((r == SMFIS_TEMPFAIL && *ctx->ctx_reply == '4') ||
665 (r == SMFIS_REJECT && *ctx->ctx_reply == '5')))
666 {
667 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_REPLYCODE,
668 ctx->ctx_reply,
669 strlen(ctx->ctx_reply) + 1);
670 free(ctx->ctx_reply);
671 ctx->ctx_reply = NULL;
672 }
673 else
674 {
675 ret = mi_wr_cmd(sd, timeout_ptr, r == SMFIS_REJECT ?
676 SMFIR_REJECT : SMFIR_TEMPFAIL, NULL, 0);
677 }
678 break;
679 case SMFIS_DISCARD:
680 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_DISCARD, NULL, 0);
681 break;
682 case SMFIS_ACCEPT:
683 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_ACCEPT, NULL, 0);
684 break;
685 case SMFIS_SKIP:
686 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_SKIP, NULL, 0);
687 break;
688 case _SMFIS_OPTIONS:
689 {
690 mi_int32 v;
691 size_t len;
692 char *buffer;
693 char buf[MILTER_OPTLEN];
694
695 v = htonl(ctx->ctx_prot_vers2mta);
696 (void) memcpy(&(buf[0]), (void *) &v,
697 MILTER_LEN_BYTES);
698 v = htonl(ctx->ctx_aflags);
699 (void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v,
700 MILTER_LEN_BYTES);
701 v = htonl(ctx->ctx_pflags2mta);
702 (void) memcpy(&(buf[MILTER_LEN_BYTES * 2]),
703 (void *) &v, MILTER_LEN_BYTES);
704 len = milter_addsymlist(ctx, buf, &buffer);
705 if (buffer != NULL)
706 {
707 ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG,
708 buffer, len);
709 if (buffer != buf)
710 free(buffer);
711 }
712 else
713 ret = MI_FAILURE;
714 }
715 break;
716 case SMFIS_NOREPLY:
717 if (bit != 0 &&
718 (ctx->ctx_pflags & bit) != 0 &&
719 (ctx->ctx_mta_pflags & bit) == 0)
720 {
721 /*
722 ** milter doesn't want to send a reply,
723 ** but the MTA doesn't have that feature: fake it.
724 */
725
726 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL,
727 0);
728 }
729 break;
730 default: /* don't send a reply */
731 break;
732 }
733 return ret;
734 }
735
736 /*
737 ** MI_CLR_MACROS -- clear set of macros starting from a given index
738 **
739 ** Parameters:
740 ** ctx -- context structure
741 ** m -- index from which to clear all macros
742 **
743 ** Returns:
744 ** None.
745 */
746
747 void
mi_clr_macros(ctx,m)748 mi_clr_macros(ctx, m)
749 SMFICTX_PTR ctx;
750 int m;
751 {
752 int i;
753
754 for (i = m; i < MAX_MACROS_ENTRIES; i++)
755 {
756 if (ctx->ctx_mac_ptr[i] != NULL)
757 {
758 free(ctx->ctx_mac_ptr[i]);
759 ctx->ctx_mac_ptr[i] = NULL;
760 }
761 if (ctx->ctx_mac_buf[i] != NULL)
762 {
763 free(ctx->ctx_mac_buf[i]);
764 ctx->ctx_mac_buf[i] = NULL;
765 }
766 }
767 }
768
769 /*
770 ** MI_CLR_SYMLIST -- clear list of macros
771 **
772 ** Parameters:
773 ** ctx -- context structure
774 **
775 ** Returns:
776 ** None.
777 */
778
779 static void
mi_clr_symlist(ctx)780 mi_clr_symlist(ctx)
781 SMFICTX *ctx;
782 {
783 int i;
784
785 SM_ASSERT(ctx != NULL);
786 for (i = SMFIM_FIRST; i <= SMFIM_LAST; i++)
787 {
788 if (ctx->ctx_mac_list[i] != NULL)
789 {
790 free(ctx->ctx_mac_list[i]);
791 ctx->ctx_mac_list[i] = NULL;
792 }
793 }
794 }
795
796 /*
797 ** MI_CLR_CTX -- clear context
798 **
799 ** Parameters:
800 ** ctx -- context structure
801 **
802 ** Returns:
803 ** None.
804 */
805
806 void
mi_clr_ctx(ctx)807 mi_clr_ctx(ctx)
808 SMFICTX *ctx;
809 {
810 SM_ASSERT(ctx != NULL);
811 if (ValidSocket(ctx->ctx_sd))
812 {
813 (void) closesocket(ctx->ctx_sd);
814 ctx->ctx_sd = INVALID_SOCKET;
815 }
816 if (ctx->ctx_reply != NULL)
817 {
818 free(ctx->ctx_reply);
819 ctx->ctx_reply = NULL;
820 }
821 if (ctx->ctx_privdata != NULL)
822 {
823 smi_log(SMI_LOG_WARN,
824 "%s: private data not NULL",
825 ctx->ctx_smfi->xxfi_name);
826 }
827 mi_clr_macros(ctx, 0);
828 mi_clr_symlist(ctx);
829 free(ctx);
830 }
831
832 /*
833 ** ST_OPTIONNEG -- negotiate options
834 **
835 ** Parameters:
836 ** g -- generic argument structure
837 **
838 ** Returns:
839 ** abort/send options/continue
840 */
841
842 static int
st_optionneg(g)843 st_optionneg(g)
844 genarg *g;
845 {
846 mi_int32 i, v, fake_pflags, internal_pflags;
847 SMFICTX_PTR ctx;
848 #if _FFR_MILTER_CHECK
849 bool testmode = false;
850 #endif
851 int (*fi_negotiate) __P((SMFICTX *,
852 unsigned long, unsigned long,
853 unsigned long, unsigned long,
854 unsigned long *, unsigned long *,
855 unsigned long *, unsigned long *));
856
857 if (g == NULL || g->a_ctx->ctx_smfi == NULL)
858 return SMFIS_CONTINUE;
859 ctx = g->a_ctx;
860 mi_clr_macros(ctx, g->a_idx + 1);
861 ctx->ctx_prot_vers = SMFI_PROT_VERSION;
862
863 /* check for minimum length */
864 if (g->a_len < MILTER_OPTLEN)
865 {
866 smi_log(SMI_LOG_ERR,
867 "%s: st_optionneg[%ld]: len too short %d < %d",
868 ctx->ctx_smfi->xxfi_name,
869 (long) ctx->ctx_id, (int) g->a_len,
870 MILTER_OPTLEN);
871 return _SMFIS_ABORT;
872 }
873
874 /* protocol version */
875 (void) memcpy((void *) &i, (void *) &(g->a_buf[0]), MILTER_LEN_BYTES);
876 v = ntohl(i);
877
878 #define SMFI_PROT_VERSION_MIN 2
879
880 /* check for minimum version */
881 if (v < SMFI_PROT_VERSION_MIN)
882 {
883 smi_log(SMI_LOG_ERR,
884 "%s: st_optionneg[%ld]: protocol version too old %d < %d",
885 ctx->ctx_smfi->xxfi_name,
886 (long) ctx->ctx_id, v, SMFI_PROT_VERSION_MIN);
887 return _SMFIS_ABORT;
888 }
889 ctx->ctx_mta_prot_vers = v;
890 if (ctx->ctx_prot_vers < ctx->ctx_mta_prot_vers)
891 ctx->ctx_prot_vers2mta = ctx->ctx_prot_vers;
892 else
893 ctx->ctx_prot_vers2mta = ctx->ctx_mta_prot_vers;
894
895 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES]),
896 MILTER_LEN_BYTES);
897 v = ntohl(i);
898
899 /* no flags? set to default value for V1 actions */
900 if (v == 0)
901 v = SMFI_V1_ACTS;
902 ctx->ctx_mta_aflags = v; /* MTA action flags */
903
904 internal_pflags = 0;
905 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES * 2]),
906 MILTER_LEN_BYTES);
907 v = ntohl(i);
908
909 /* no flags? set to default value for V1 protocol */
910 if (v == 0)
911 v = SMFI_V1_PROT;
912 #if _FFR_MDS_NEGOTIATE
913 else if (ctx->ctx_smfi->xxfi_version >= SMFI_VERSION_MDS)
914 {
915 /*
916 ** Allow changing the size only if milter is compiled
917 ** against a version that supports this.
918 ** If a milter is dynamically linked against a newer
919 ** libmilter version, we don't want to "surprise"
920 ** it with a larger buffer as it may rely on it
921 ** even though it is not documented as a limit.
922 */
923
924 if (bitset(SMFIP_MDS_1M, v))
925 {
926 internal_pflags |= SMFIP_MDS_1M;
927 (void) smfi_setmaxdatasize(MILTER_MDS_1M);
928 }
929 else if (bitset(SMFIP_MDS_256K, v))
930 {
931 internal_pflags |= SMFIP_MDS_256K;
932 (void) smfi_setmaxdatasize(MILTER_MDS_256K);
933 }
934 }
935 # if 0
936 /* don't log this for now... */
937 else if (ctx->ctx_smfi->xxfi_version < SMFI_VERSION_MDS &&
938 bitset(SMFIP_MDS_1M|SMFIP_MDS_256K, v))
939 {
940 smi_log(SMI_LOG_WARN,
941 "%s: st_optionneg[%ld]: milter version=%X, trying flags=%X",
942 ctx->ctx_smfi->xxfi_name,
943 (long) ctx->ctx_id, ctx->ctx_smfi->xxfi_version, v);
944 }
945 # endif /* 0 */
946 #endif /* _FFR_MDS_NEGOTIATE */
947
948 /*
949 ** MTA protocol flags.
950 ** We pass the internal flags to the milter as "read only",
951 ** i.e., a milter can read them so it knows which size
952 ** will be used, but any changes by a milter will be ignored
953 ** (see below, search for SMFI_INTERNAL).
954 */
955
956 ctx->ctx_mta_pflags = (v & ~SMFI_INTERNAL) | internal_pflags;
957
958 /*
959 ** Copy flags from milter struct into libmilter context;
960 ** this variable will be used later on to check whether
961 ** the MTA "actions" can fulfill the milter requirements,
962 ** but it may be overwritten by the negotiate callback.
963 */
964
965 ctx->ctx_aflags = ctx->ctx_smfi->xxfi_flags;
966 fake_pflags = SMFIP_NR_CONN
967 |SMFIP_NR_HELO
968 |SMFIP_NR_MAIL
969 |SMFIP_NR_RCPT
970 |SMFIP_NR_DATA
971 |SMFIP_NR_UNKN
972 |SMFIP_NR_HDR
973 |SMFIP_NR_EOH
974 |SMFIP_NR_BODY
975 ;
976
977 if (g->a_ctx->ctx_smfi != NULL &&
978 g->a_ctx->ctx_smfi->xxfi_version > 4 &&
979 (fi_negotiate = g->a_ctx->ctx_smfi->xxfi_negotiate) != NULL)
980 {
981 int r;
982 unsigned long m_aflags, m_pflags, m_f2, m_f3;
983
984 /*
985 ** let milter decide whether the features offered by the
986 ** MTA are "good enough".
987 ** Notes:
988 ** - libmilter can "fake" some features (e.g., SMFIP_NR_HDR)
989 ** - m_f2, m_f3 are for future extensions
990 */
991
992 m_f2 = m_f3 = 0;
993 m_aflags = ctx->ctx_mta_aflags;
994 m_pflags = ctx->ctx_pflags;
995 if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0)
996 m_pflags |= SMFIP_SKIP;
997 r = fi_negotiate(g->a_ctx,
998 ctx->ctx_mta_aflags,
999 ctx->ctx_mta_pflags|fake_pflags,
1000 0, 0,
1001 &m_aflags, &m_pflags, &m_f2, &m_f3);
1002
1003 #if _FFR_MILTER_CHECK
1004 testmode = bitset(SMFIP_TEST, m_pflags);
1005 if (testmode)
1006 m_pflags &= ~SMFIP_TEST;
1007 #endif
1008
1009 /*
1010 ** Types of protocol flags (pflags):
1011 ** 1. do NOT send protocol step X
1012 ** 2. MTA can do/understand something extra (SKIP,
1013 ** send unknown RCPTs)
1014 ** 3. MTA can deal with "no reply" for various protocol steps
1015 ** Note: this mean that it isn't possible to simply set all
1016 ** flags to get "everything":
1017 ** setting a flag of type 1 turns off a step
1018 ** (it should be the other way around:
1019 ** a flag means a protocol step can be sent)
1020 ** setting a flag of type 3 requires that milter
1021 ** never sends a reply for the corresponding step.
1022 ** Summary: the "negation" of protocol flags is causing
1023 ** problems, but at least for type 3 there is no simple
1024 ** solution.
1025 **
1026 ** What should "all options" mean?
1027 ** send all protocol steps _except_ those for which there is
1028 ** no callback (currently registered in ctx_pflags)
1029 ** expect SKIP as return code? Yes
1030 ** send unknown RCPTs? No,
1031 ** must be explicitly requested?
1032 ** "no reply" for some protocol steps? No,
1033 ** must be explicitly requested.
1034 */
1035
1036 if (SMFIS_ALL_OPTS == r)
1037 {
1038 ctx->ctx_aflags = ctx->ctx_mta_aflags;
1039 ctx->ctx_pflags2mta = ctx->ctx_pflags;
1040 if ((SMFIP_SKIP & ctx->ctx_mta_pflags) != 0)
1041 ctx->ctx_pflags2mta |= SMFIP_SKIP;
1042 }
1043 else if (r != SMFIS_CONTINUE)
1044 {
1045 smi_log(SMI_LOG_ERR,
1046 "%s: st_optionneg[%ld]: xxfi_negotiate returned %d (protocol options=0x%lx, actions=0x%lx)",
1047 ctx->ctx_smfi->xxfi_name,
1048 (long) ctx->ctx_id, r, ctx->ctx_mta_pflags,
1049 ctx->ctx_mta_aflags);
1050 return _SMFIS_ABORT;
1051 }
1052 else
1053 {
1054 ctx->ctx_aflags = m_aflags;
1055 ctx->ctx_pflags = m_pflags;
1056 ctx->ctx_pflags2mta = m_pflags;
1057 }
1058
1059 /* check whether some flags need to be "faked" */
1060 i = ctx->ctx_pflags2mta;
1061 if ((ctx->ctx_mta_pflags & i) != i)
1062 {
1063 unsigned int idx;
1064 unsigned long b;
1065
1066 /*
1067 ** If some behavior can be faked (set in fake_pflags),
1068 ** but the MTA doesn't support it, then unset
1069 ** that flag in the value that is sent to the MTA.
1070 */
1071
1072 for (idx = 0; idx < 32; idx++)
1073 {
1074 b = 1 << idx;
1075 if ((ctx->ctx_mta_pflags & b) != b &&
1076 (fake_pflags & b) == b)
1077 ctx->ctx_pflags2mta &= ~b;
1078 }
1079 }
1080 }
1081 else
1082 {
1083 /*
1084 ** Set the protocol flags based on the values determined
1085 ** in mi_listener() which checked the defined callbacks.
1086 */
1087
1088 ctx->ctx_pflags2mta = ctx->ctx_pflags;
1089 }
1090
1091 /* check whether actions and protocol requirements can be satisfied */
1092 i = ctx->ctx_aflags;
1093 if ((i & ctx->ctx_mta_aflags) != i)
1094 {
1095 smi_log(SMI_LOG_ERR,
1096 "%s: st_optionneg[%ld]: 0x%lx does not fulfill action requirements 0x%x",
1097 ctx->ctx_smfi->xxfi_name,
1098 (long) ctx->ctx_id, ctx->ctx_mta_aflags, i);
1099 return _SMFIS_ABORT;
1100 }
1101
1102 i = ctx->ctx_pflags2mta;
1103 if ((ctx->ctx_mta_pflags & i) != i)
1104 {
1105 /*
1106 ** Older MTAs do not support some protocol steps.
1107 ** As this protocol is a bit "weird" (it asks for steps
1108 ** NOT to be taken/sent) we have to check whether we
1109 ** should turn off those "negative" requests.
1110 ** Currently these are only SMFIP_NODATA and SMFIP_NOUNKNOWN.
1111 */
1112
1113 if (bitset(SMFIP_NODATA, ctx->ctx_pflags2mta) &&
1114 !bitset(SMFIP_NODATA, ctx->ctx_mta_pflags))
1115 ctx->ctx_pflags2mta &= ~SMFIP_NODATA;
1116 if (bitset(SMFIP_NOUNKNOWN, ctx->ctx_pflags2mta) &&
1117 !bitset(SMFIP_NOUNKNOWN, ctx->ctx_mta_pflags))
1118 ctx->ctx_pflags2mta &= ~SMFIP_NOUNKNOWN;
1119 i = ctx->ctx_pflags2mta;
1120 }
1121
1122 if ((ctx->ctx_mta_pflags & i) != i)
1123 {
1124 smi_log(SMI_LOG_ERR,
1125 "%s: st_optionneg[%ld]: 0x%lx does not fulfill protocol requirements 0x%x",
1126 ctx->ctx_smfi->xxfi_name,
1127 (long) ctx->ctx_id, ctx->ctx_mta_pflags, i);
1128 return _SMFIS_ABORT;
1129 }
1130 fix_stm(ctx);
1131
1132 if (ctx->ctx_dbg > 3)
1133 sm_dprintf("[%lu] milter_negotiate:"
1134 " mta_actions=0x%lx, mta_flags=0x%lx"
1135 " actions=0x%lx, flags=0x%lx\n"
1136 , (long) ctx->ctx_id
1137 , ctx->ctx_mta_aflags, ctx->ctx_mta_pflags
1138 , ctx->ctx_aflags, ctx->ctx_pflags);
1139
1140 #if _FFR_MILTER_CHECK
1141 if (ctx->ctx_dbg > 3)
1142 sm_dprintf("[%lu] milter_negotiate:"
1143 " testmode=%d, pflags2mta=%X, internal_pflags=%X\n"
1144 , (long) ctx->ctx_id, testmode
1145 , ctx->ctx_pflags2mta, internal_pflags);
1146
1147 /* in test mode: take flags without further modifications */
1148 if (!testmode)
1149 /* Warning: check statement below! */
1150 #endif /* _FFR_MILTER_CHECK */
1151
1152 /*
1153 ** Remove the internal flags that might have been set by a milter
1154 ** and set only those determined above.
1155 */
1156
1157 ctx->ctx_pflags2mta = (ctx->ctx_pflags2mta & ~SMFI_INTERNAL)
1158 | internal_pflags;
1159 return _SMFIS_OPTIONS;
1160 }
1161
1162 /*
1163 ** ST_CONNECTINFO -- receive connection information
1164 **
1165 ** Parameters:
1166 ** g -- generic argument structure
1167 **
1168 ** Returns:
1169 ** continue or filter-specified value
1170 */
1171
1172 static int
st_connectinfo(g)1173 st_connectinfo(g)
1174 genarg *g;
1175 {
1176 size_t l;
1177 size_t i;
1178 char *s, family;
1179 unsigned short port = 0;
1180 _SOCK_ADDR sockaddr;
1181 sfsistat (*fi_connect) __P((SMFICTX *, char *, _SOCK_ADDR *));
1182
1183 if (g == NULL)
1184 return _SMFIS_ABORT;
1185 mi_clr_macros(g->a_ctx, g->a_idx + 1);
1186 if (g->a_ctx->ctx_smfi == NULL ||
1187 (fi_connect = g->a_ctx->ctx_smfi->xxfi_connect) == NULL)
1188 return SMFIS_CONTINUE;
1189
1190 s = g->a_buf;
1191 i = 0;
1192 l = g->a_len;
1193 while (i <= l && s[i] != '\0')
1194 ++i;
1195 if (i + 1 >= l)
1196 return _SMFIS_ABORT;
1197
1198 /* Move past trailing \0 in host string */
1199 i++;
1200 family = s[i++];
1201 (void) memset(&sockaddr, '\0', sizeof sockaddr);
1202 if (family != SMFIA_UNKNOWN)
1203 {
1204 if (i + sizeof port >= l)
1205 {
1206 smi_log(SMI_LOG_ERR,
1207 "%s: connect[%ld]: wrong len %d >= %d",
1208 g->a_ctx->ctx_smfi->xxfi_name,
1209 (long) g->a_ctx->ctx_id, (int) i, (int) l);
1210 return _SMFIS_ABORT;
1211 }
1212 (void) memcpy((void *) &port, (void *) (s + i),
1213 sizeof port);
1214 i += sizeof port;
1215
1216 /* make sure string is terminated */
1217 if (s[l - 1] != '\0')
1218 return _SMFIS_ABORT;
1219 #if NETINET
1220 if (family == SMFIA_INET)
1221 {
1222 if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr)
1223 != 1)
1224 {
1225 smi_log(SMI_LOG_ERR,
1226 "%s: connect[%ld]: inet_aton failed",
1227 g->a_ctx->ctx_smfi->xxfi_name,
1228 (long) g->a_ctx->ctx_id);
1229 return _SMFIS_ABORT;
1230 }
1231 sockaddr.sa.sa_family = AF_INET;
1232 if (port > 0)
1233 sockaddr.sin.sin_port = port;
1234 }
1235 else
1236 #endif /* NETINET */
1237 #if NETINET6
1238 if (family == SMFIA_INET6)
1239 {
1240 if (mi_inet_pton(AF_INET6, s + i,
1241 &sockaddr.sin6.sin6_addr) != 1)
1242 {
1243 smi_log(SMI_LOG_ERR,
1244 "%s: connect[%ld]: mi_inet_pton failed",
1245 g->a_ctx->ctx_smfi->xxfi_name,
1246 (long) g->a_ctx->ctx_id);
1247 return _SMFIS_ABORT;
1248 }
1249 sockaddr.sa.sa_family = AF_INET6;
1250 if (port > 0)
1251 sockaddr.sin6.sin6_port = port;
1252 }
1253 else
1254 #endif /* NETINET6 */
1255 #if NETUNIX
1256 if (family == SMFIA_UNIX)
1257 {
1258 if (sm_strlcpy(sockaddr.sunix.sun_path, s + i,
1259 sizeof sockaddr.sunix.sun_path) >=
1260 sizeof sockaddr.sunix.sun_path)
1261 {
1262 smi_log(SMI_LOG_ERR,
1263 "%s: connect[%ld]: path too long",
1264 g->a_ctx->ctx_smfi->xxfi_name,
1265 (long) g->a_ctx->ctx_id);
1266 return _SMFIS_ABORT;
1267 }
1268 sockaddr.sunix.sun_family = AF_UNIX;
1269 }
1270 else
1271 #endif /* NETUNIX */
1272 {
1273 smi_log(SMI_LOG_ERR,
1274 "%s: connect[%ld]: unknown family %d",
1275 g->a_ctx->ctx_smfi->xxfi_name,
1276 (long) g->a_ctx->ctx_id, family);
1277 return _SMFIS_ABORT;
1278 }
1279 }
1280 return (*fi_connect)(g->a_ctx, g->a_buf,
1281 family != SMFIA_UNKNOWN ? &sockaddr : NULL);
1282 }
1283
1284 /*
1285 ** ST_EOH -- end of headers
1286 **
1287 ** Parameters:
1288 ** g -- generic argument structure
1289 **
1290 ** Returns:
1291 ** continue or filter-specified value
1292 */
1293
1294 static int
st_eoh(g)1295 st_eoh(g)
1296 genarg *g;
1297 {
1298 sfsistat (*fi_eoh) __P((SMFICTX *));
1299
1300 if (g == NULL)
1301 return _SMFIS_ABORT;
1302 if (g->a_ctx->ctx_smfi != NULL &&
1303 (fi_eoh = g->a_ctx->ctx_smfi->xxfi_eoh) != NULL)
1304 return (*fi_eoh)(g->a_ctx);
1305 return SMFIS_CONTINUE;
1306 }
1307
1308 /*
1309 ** ST_DATA -- DATA command
1310 **
1311 ** Parameters:
1312 ** g -- generic argument structure
1313 **
1314 ** Returns:
1315 ** continue or filter-specified value
1316 */
1317
1318 static int
st_data(g)1319 st_data(g)
1320 genarg *g;
1321 {
1322 sfsistat (*fi_data) __P((SMFICTX *));
1323
1324 if (g == NULL)
1325 return _SMFIS_ABORT;
1326 if (g->a_ctx->ctx_smfi != NULL &&
1327 g->a_ctx->ctx_smfi->xxfi_version > 3 &&
1328 (fi_data = g->a_ctx->ctx_smfi->xxfi_data) != NULL)
1329 return (*fi_data)(g->a_ctx);
1330 return SMFIS_CONTINUE;
1331 }
1332
1333 /*
1334 ** ST_HELO -- helo/ehlo command
1335 **
1336 ** Parameters:
1337 ** g -- generic argument structure
1338 **
1339 ** Returns:
1340 ** continue or filter-specified value
1341 */
1342
1343 static int
st_helo(g)1344 st_helo(g)
1345 genarg *g;
1346 {
1347 sfsistat (*fi_helo) __P((SMFICTX *, char *));
1348
1349 if (g == NULL)
1350 return _SMFIS_ABORT;
1351 mi_clr_macros(g->a_ctx, g->a_idx + 1);
1352 if (g->a_ctx->ctx_smfi != NULL &&
1353 (fi_helo = g->a_ctx->ctx_smfi->xxfi_helo) != NULL)
1354 {
1355 /* paranoia: check for terminating '\0' */
1356 if (g->a_len == 0 || g->a_buf[g->a_len - 1] != '\0')
1357 return MI_FAILURE;
1358 return (*fi_helo)(g->a_ctx, g->a_buf);
1359 }
1360 return SMFIS_CONTINUE;
1361 }
1362
1363 /*
1364 ** ST_HEADER -- header line
1365 **
1366 ** Parameters:
1367 ** g -- generic argument structure
1368 **
1369 ** Returns:
1370 ** continue or filter-specified value
1371 */
1372
1373 static int
st_header(g)1374 st_header(g)
1375 genarg *g;
1376 {
1377 char *hf, *hv;
1378 sfsistat (*fi_header) __P((SMFICTX *, char *, char *));
1379
1380 if (g == NULL)
1381 return _SMFIS_ABORT;
1382 if (g->a_ctx->ctx_smfi == NULL ||
1383 (fi_header = g->a_ctx->ctx_smfi->xxfi_header) == NULL)
1384 return SMFIS_CONTINUE;
1385 if (dec_arg2(g->a_buf, g->a_len, &hf, &hv) == MI_SUCCESS)
1386 return (*fi_header)(g->a_ctx, hf, hv);
1387 else
1388 return _SMFIS_ABORT;
1389 }
1390
1391 #define ARGV_FCT(lf, rf, idx) \
1392 char **argv; \
1393 sfsistat (*lf) __P((SMFICTX *, char **)); \
1394 int r; \
1395 \
1396 if (g == NULL) \
1397 return _SMFIS_ABORT; \
1398 mi_clr_macros(g->a_ctx, g->a_idx + 1); \
1399 if (g->a_ctx->ctx_smfi == NULL || \
1400 (lf = g->a_ctx->ctx_smfi->rf) == NULL) \
1401 return SMFIS_CONTINUE; \
1402 if ((argv = dec_argv(g->a_buf, g->a_len)) == NULL) \
1403 return _SMFIS_ABORT; \
1404 r = (*lf)(g->a_ctx, argv); \
1405 free(argv); \
1406 return r;
1407
1408 /*
1409 ** ST_SENDER -- MAIL FROM command
1410 **
1411 ** Parameters:
1412 ** g -- generic argument structure
1413 **
1414 ** Returns:
1415 ** continue or filter-specified value
1416 */
1417
1418 static int
st_sender(g)1419 st_sender(g)
1420 genarg *g;
1421 {
1422 ARGV_FCT(fi_envfrom, xxfi_envfrom, CI_MAIL)
1423 }
1424
1425 /*
1426 ** ST_RCPT -- RCPT TO command
1427 **
1428 ** Parameters:
1429 ** g -- generic argument structure
1430 **
1431 ** Returns:
1432 ** continue or filter-specified value
1433 */
1434
1435 static int
st_rcpt(g)1436 st_rcpt(g)
1437 genarg *g;
1438 {
1439 ARGV_FCT(fi_envrcpt, xxfi_envrcpt, CI_RCPT)
1440 }
1441
1442 /*
1443 ** ST_UNKNOWN -- unrecognized or unimplemented command
1444 **
1445 ** Parameters:
1446 ** g -- generic argument structure
1447 **
1448 ** Returns:
1449 ** continue or filter-specified value
1450 */
1451
1452 static int
st_unknown(g)1453 st_unknown(g)
1454 genarg *g;
1455 {
1456 sfsistat (*fi_unknown) __P((SMFICTX *, const char *));
1457
1458 if (g == NULL)
1459 return _SMFIS_ABORT;
1460 if (g->a_ctx->ctx_smfi != NULL &&
1461 g->a_ctx->ctx_smfi->xxfi_version > 2 &&
1462 (fi_unknown = g->a_ctx->ctx_smfi->xxfi_unknown) != NULL)
1463 return (*fi_unknown)(g->a_ctx, (const char *) g->a_buf);
1464 return SMFIS_CONTINUE;
1465 }
1466
1467 /*
1468 ** ST_MACROS -- deal with macros received from the MTA
1469 **
1470 ** Parameters:
1471 ** g -- generic argument structure
1472 **
1473 ** Returns:
1474 ** continue/keep
1475 **
1476 ** Side effects:
1477 ** set pointer in macro array to current values.
1478 */
1479
1480 static int
st_macros(g)1481 st_macros(g)
1482 genarg *g;
1483 {
1484 int i;
1485 char **argv;
1486
1487 if (g == NULL || g->a_len < 1)
1488 return _SMFIS_FAIL;
1489 if ((argv = dec_argv(g->a_buf + 1, g->a_len - 1)) == NULL)
1490 return _SMFIS_FAIL;
1491 switch (g->a_buf[0])
1492 {
1493 case SMFIC_CONNECT:
1494 i = CI_CONN;
1495 break;
1496 case SMFIC_HELO:
1497 i = CI_HELO;
1498 break;
1499 case SMFIC_MAIL:
1500 i = CI_MAIL;
1501 break;
1502 case SMFIC_RCPT:
1503 i = CI_RCPT;
1504 break;
1505 case SMFIC_DATA:
1506 i = CI_DATA;
1507 break;
1508 case SMFIC_BODYEOB:
1509 i = CI_EOM;
1510 break;
1511 case SMFIC_EOH:
1512 i = CI_EOH;
1513 break;
1514 default:
1515 free(argv);
1516 return _SMFIS_FAIL;
1517 }
1518 if (g->a_ctx->ctx_mac_ptr[i] != NULL)
1519 free(g->a_ctx->ctx_mac_ptr[i]);
1520 if (g->a_ctx->ctx_mac_buf[i] != NULL)
1521 free(g->a_ctx->ctx_mac_buf[i]);
1522 g->a_ctx->ctx_mac_ptr[i] = argv;
1523 g->a_ctx->ctx_mac_buf[i] = g->a_buf;
1524 return _SMFIS_KEEP;
1525 }
1526
1527 /*
1528 ** ST_QUIT -- quit command
1529 **
1530 ** Parameters:
1531 ** g -- generic argument structure
1532 **
1533 ** Returns:
1534 ** noreply
1535 */
1536
1537 /* ARGSUSED */
1538 static int
st_quit(g)1539 st_quit(g)
1540 genarg *g;
1541 {
1542 sfsistat (*fi_close) __P((SMFICTX *));
1543
1544 if (g == NULL)
1545 return _SMFIS_ABORT;
1546 if (g->a_ctx->ctx_smfi != NULL &&
1547 (fi_close = g->a_ctx->ctx_smfi->xxfi_close) != NULL)
1548 (void) (*fi_close)(g->a_ctx);
1549 mi_clr_macros(g->a_ctx, 0);
1550 return _SMFIS_NOREPLY;
1551 }
1552
1553 /*
1554 ** ST_BODYCHUNK -- deal with a piece of the mail body
1555 **
1556 ** Parameters:
1557 ** g -- generic argument structure
1558 **
1559 ** Returns:
1560 ** continue or filter-specified value
1561 */
1562
1563 static int
st_bodychunk(g)1564 st_bodychunk(g)
1565 genarg *g;
1566 {
1567 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t));
1568
1569 if (g == NULL)
1570 return _SMFIS_ABORT;
1571 if (g->a_ctx->ctx_smfi != NULL &&
1572 (fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL)
1573 return (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf,
1574 g->a_len);
1575 return SMFIS_CONTINUE;
1576 }
1577
1578 /*
1579 ** ST_BODYEND -- deal with the last piece of the mail body
1580 **
1581 ** Parameters:
1582 ** g -- generic argument structure
1583 **
1584 ** Returns:
1585 ** continue or filter-specified value
1586 **
1587 ** Side effects:
1588 ** sends a reply for the body part (if non-empty).
1589 */
1590
1591 static int
st_bodyend(g)1592 st_bodyend(g)
1593 genarg *g;
1594 {
1595 sfsistat r;
1596 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t));
1597 sfsistat (*fi_eom) __P((SMFICTX *));
1598
1599 if (g == NULL)
1600 return _SMFIS_ABORT;
1601 r = SMFIS_CONTINUE;
1602 if (g->a_ctx->ctx_smfi != NULL)
1603 {
1604 if ((fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL &&
1605 g->a_len > 0)
1606 {
1607 socket_t sd;
1608 struct timeval timeout;
1609
1610 timeout.tv_sec = g->a_ctx->ctx_timeout;
1611 timeout.tv_usec = 0;
1612 sd = g->a_ctx->ctx_sd;
1613 r = (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf,
1614 g->a_len);
1615 if (r != SMFIS_CONTINUE &&
1616 sendreply(r, sd, &timeout, g->a_ctx) != MI_SUCCESS)
1617 return _SMFIS_ABORT;
1618 }
1619 }
1620 if (r == SMFIS_CONTINUE &&
1621 (fi_eom = g->a_ctx->ctx_smfi->xxfi_eom) != NULL)
1622 return (*fi_eom)(g->a_ctx);
1623 return r;
1624 }
1625
1626 /*
1627 ** ST_ABORTFCT -- deal with aborts
1628 **
1629 ** Parameters:
1630 ** g -- generic argument structure
1631 **
1632 ** Returns:
1633 ** abort or filter-specified value
1634 */
1635
1636 static int
st_abortfct(g)1637 st_abortfct(g)
1638 genarg *g;
1639 {
1640 sfsistat (*fi_abort) __P((SMFICTX *));
1641
1642 if (g == NULL)
1643 return _SMFIS_ABORT;
1644 if (g != NULL && g->a_ctx->ctx_smfi != NULL &&
1645 (fi_abort = g->a_ctx->ctx_smfi->xxfi_abort) != NULL)
1646 (void) (*fi_abort)(g->a_ctx);
1647 return _SMFIS_NOREPLY;
1648 }
1649
1650 /*
1651 ** TRANS_OK -- is the state transition ok?
1652 **
1653 ** Parameters:
1654 ** old -- old state
1655 ** new -- new state
1656 **
1657 ** Returns:
1658 ** state transition ok
1659 */
1660
1661 static bool
trans_ok(old,new)1662 trans_ok(old, new)
1663 int old, new;
1664 {
1665 int s, n;
1666
1667 s = old;
1668 if (s >= SIZE_NEXT_STATES)
1669 return false;
1670 do
1671 {
1672 /* is this state transition allowed? */
1673 if ((MI_MASK(new) & next_states[s]) != 0)
1674 return true;
1675
1676 /*
1677 ** no: try next state;
1678 ** this works since the relevant states are ordered
1679 ** strict sequentially
1680 */
1681
1682 n = s + 1;
1683 if (n >= SIZE_NEXT_STATES)
1684 return false;
1685
1686 /*
1687 ** can we actually "skip" this state?
1688 ** see fix_stm() which sets this bit for those
1689 ** states which the filter program is not interested in
1690 */
1691
1692 if (bitset(NX_SKIP, next_states[n]))
1693 s = n;
1694 else
1695 return false;
1696 } while (s < SIZE_NEXT_STATES);
1697 return false;
1698 }
1699
1700 /*
1701 ** FIX_STM -- add "skip" bits to the state transition table
1702 **
1703 ** Parameters:
1704 ** ctx -- context structure
1705 **
1706 ** Returns:
1707 ** None.
1708 **
1709 ** Side effects:
1710 ** may change state transition table.
1711 */
1712
1713 static void
fix_stm(ctx)1714 fix_stm(ctx)
1715 SMFICTX_PTR ctx;
1716 {
1717 unsigned long fl;
1718
1719 if (ctx == NULL || ctx->ctx_smfi == NULL)
1720 return;
1721 fl = ctx->ctx_pflags;
1722 if (bitset(SMFIP_NOCONNECT, fl))
1723 next_states[ST_CONN] |= NX_SKIP;
1724 if (bitset(SMFIP_NOHELO, fl))
1725 next_states[ST_HELO] |= NX_SKIP;
1726 if (bitset(SMFIP_NOMAIL, fl))
1727 next_states[ST_MAIL] |= NX_SKIP;
1728 if (bitset(SMFIP_NORCPT, fl))
1729 next_states[ST_RCPT] |= NX_SKIP;
1730 if (bitset(SMFIP_NOHDRS, fl))
1731 next_states[ST_HDRS] |= NX_SKIP;
1732 if (bitset(SMFIP_NOEOH, fl))
1733 next_states[ST_EOHS] |= NX_SKIP;
1734 if (bitset(SMFIP_NOBODY, fl))
1735 next_states[ST_BODY] |= NX_SKIP;
1736 if (bitset(SMFIP_NODATA, fl))
1737 next_states[ST_DATA] |= NX_SKIP;
1738 if (bitset(SMFIP_NOUNKNOWN, fl))
1739 next_states[ST_UNKN] |= NX_SKIP;
1740 }
1741
1742 /*
1743 ** DEC_ARGV -- split a buffer into a list of strings, NULL terminated
1744 **
1745 ** Parameters:
1746 ** buf -- buffer with several strings
1747 ** len -- length of buffer
1748 **
1749 ** Returns:
1750 ** array of pointers to the individual strings
1751 */
1752
1753 static char **
dec_argv(buf,len)1754 dec_argv(buf, len)
1755 char *buf;
1756 size_t len;
1757 {
1758 char **s;
1759 size_t i;
1760 int elem, nelem;
1761
1762 nelem = 0;
1763 for (i = 0; i < len; i++)
1764 {
1765 if (buf[i] == '\0')
1766 ++nelem;
1767 }
1768 if (nelem == 0)
1769 return NULL;
1770
1771 /* last entry is only for the name */
1772 s = (char **)malloc((nelem + 1) * (sizeof *s));
1773 if (s == NULL)
1774 return NULL;
1775 s[0] = buf;
1776 for (i = 0, elem = 0; i < len && elem < nelem; i++)
1777 {
1778 if (buf[i] == '\0')
1779 {
1780 ++elem;
1781 if (i + 1 >= len)
1782 s[elem] = NULL;
1783 else
1784 s[elem] = &(buf[i + 1]);
1785 }
1786 }
1787
1788 /* overwrite last entry (already done above, just paranoia) */
1789 s[elem] = NULL;
1790 return s;
1791 }
1792
1793 /*
1794 ** DEC_ARG2 -- split a buffer into two strings
1795 **
1796 ** Parameters:
1797 ** buf -- buffer with two strings
1798 ** len -- length of buffer
1799 ** s1,s2 -- pointer to result strings
1800 **
1801 ** Returns:
1802 ** MI_FAILURE/MI_SUCCESS
1803 */
1804
1805 static int
dec_arg2(buf,len,s1,s2)1806 dec_arg2(buf, len, s1, s2)
1807 char *buf;
1808 size_t len;
1809 char **s1;
1810 char **s2;
1811 {
1812 size_t i;
1813
1814 /* paranoia: check for terminating '\0' */
1815 if (len == 0 || buf[len - 1] != '\0')
1816 return MI_FAILURE;
1817 *s1 = buf;
1818 for (i = 1; i < len && buf[i] != '\0'; i++)
1819 continue;
1820 if (i >= len - 1)
1821 return MI_FAILURE;
1822 *s2 = buf + i + 1;
1823 return MI_SUCCESS;
1824 }
1825
1826 /*
1827 ** MI_SENDOK -- is it ok for the filter to send stuff to the MTA?
1828 **
1829 ** Parameters:
1830 ** ctx -- context structure
1831 ** flag -- flag to check
1832 **
1833 ** Returns:
1834 ** sending allowed (in current state)
1835 */
1836
1837 bool
mi_sendok(ctx,flag)1838 mi_sendok(ctx, flag)
1839 SMFICTX_PTR ctx;
1840 int flag;
1841 {
1842 if (ctx == NULL || ctx->ctx_smfi == NULL)
1843 return false;
1844
1845 /* did the milter request this operation? */
1846 if (flag != 0 && !bitset(flag, ctx->ctx_aflags))
1847 return false;
1848
1849 /* are we in the correct state? It must be "End of Message". */
1850 return ctx->ctx_state == ST_ENDM;
1851 }
1852
1853 #if _FFR_WORKERS_POOL
1854 /*
1855 ** MI_RD_SOCKET_READY - checks if the socket is ready for read(2)
1856 **
1857 ** Parameters:
1858 ** sd -- socket_t
1859 **
1860 ** Returns:
1861 ** true iff socket is ready for read(2)
1862 */
1863
1864 #define MI_RD_CMD_TO 1
1865 #define MI_RD_MAX_ERR 16
1866
1867 static bool
mi_rd_socket_ready(sd)1868 mi_rd_socket_ready (sd)
1869 socket_t sd;
1870 {
1871 int n;
1872 int nerr = 0;
1873 # if SM_CONF_POLL
1874 struct pollfd pfd;
1875 # else
1876 fd_set rd_set, exc_set;
1877 # endif
1878
1879 do
1880 {
1881 # if SM_CONF_POLL
1882 pfd.fd = sd;
1883 pfd.events = POLLIN;
1884 pfd.revents = 0;
1885
1886 n = poll(&pfd, 1, MI_RD_CMD_TO);
1887 # else /* SM_CONF_POLL */
1888 struct timeval timeout;
1889
1890 FD_ZERO(&rd_set);
1891 FD_ZERO(&exc_set);
1892 FD_SET(sd, &rd_set);
1893 FD_SET(sd, &exc_set);
1894
1895 timeout.tv_sec = MI_RD_CMD_TO / 1000;
1896 timeout.tv_usec = 0;
1897 n = select(sd + 1, &rd_set, NULL, &exc_set, &timeout);
1898 # endif /* SM_CONF_POLL */
1899
1900 if (n < 0)
1901 {
1902 if (errno == EINTR)
1903 {
1904 nerr++;
1905 continue;
1906 }
1907 return true;
1908 }
1909
1910 if (n == 0)
1911 return false;
1912 break;
1913 } while (nerr < MI_RD_MAX_ERR);
1914 if (nerr >= MI_RD_MAX_ERR)
1915 return false;
1916
1917 # if SM_CONF_POLL
1918 return (pfd.revents != 0);
1919 # else
1920 return FD_ISSET(sd, &rd_set) || FD_ISSET(sd, &exc_set);
1921 # endif
1922 }
1923 #endif /* _FFR_WORKERS_POOL */
1924