2 * Copyright (c) 1999-2002 Sendmail, Inc. and its suppliers.
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.
12 SM_RCSID("@(#)$Id: engine.c,v 8.109.2.4 2002/12/03 17:27:32 ca Exp $")
14 #include "libmilter.h"
16 #if NETINET || NETINET6
17 # include <arpa/inet.h>
18 #endif /* NETINET || NETINET6 */
20 /* generic argument for functions in the command table */
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 */
29 typedef struct arg_struct genarg;
31 /* structure for commands received from MTA */
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 */
42 typedef struct cmdfct_t cmdfct;
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) */
53 /* possible values for cm_todo */
54 #define CT_CONT 0x0000 /* continue reading commands */
55 #define CT_IGNO 0x0001 /* continue even when error */
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 */
61 /* index in macro array: macros only for these commands */
67 #if CI_RCPT >= MAX_MACROS_ENTRIES
68 ERROR: do not compile with CI_RCPT >= MAX_MACROS_ENTRIES
71 /* function prototypes */
72 static int st_abortfct __P((genarg *));
73 static int st_macros __P((genarg *));
74 static int st_optionneg __P((genarg *));
75 static int st_bodychunk __P((genarg *));
76 static int st_connectinfo __P((genarg *));
77 static int st_bodyend __P((genarg *));
78 static int st_helo __P((genarg *));
79 static int st_header __P((genarg *));
80 static int st_sender __P((genarg *));
81 static int st_rcpt __P((genarg *));
82 static int st_eoh __P((genarg *));
83 static int st_quit __P((genarg *));
84 static int sendreply __P((sfsistat, socket_t, struct timeval *, SMFICTX_PTR));
85 static void fix_stm __P((SMFICTX_PTR));
86 static bool trans_ok __P((int, int));
87 static char **dec_argv __P((char *, size_t));
88 static int dec_arg2 __P((char *, size_t, char **, char **));
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 */
107 /* in a mail transaction? must be before eom according to spec. */
108 #define ST_IN_MAIL(st) ((st) >= ST_MAIL && (st) < ST_ENDM)
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.
119 #define MI_MASK(x) (0x0001 << (x)) /* generate a bit "mask" for a state */
120 #define NX_INIT (MI_MASK(ST_OPTS))
121 #define NX_OPTS (MI_MASK(ST_CONN))
122 #define NX_CONN (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL))
123 #define NX_HELO (MI_MASK(ST_HELO) | MI_MASK(ST_MAIL))
124 #define NX_MAIL (MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT))
125 #define NX_RCPT (MI_MASK(ST_HDRS) | MI_MASK(ST_EOHS) | \
126 MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | \
127 MI_MASK(ST_RCPT) | MI_MASK(ST_ABRT))
128 #define NX_HDRS (MI_MASK(ST_EOHS) | MI_MASK(ST_HDRS) | MI_MASK(ST_ABRT))
129 #define NX_EOHS (MI_MASK(ST_BODY) | MI_MASK(ST_ENDM) | MI_MASK(ST_ABRT))
130 #define NX_BODY (MI_MASK(ST_ENDM) | MI_MASK(ST_BODY) | MI_MASK(ST_ABRT))
131 #define NX_ENDM (MI_MASK(ST_QUIT) | MI_MASK(ST_MAIL))
134 #define NX_SKIP MI_MASK(ST_SKIP)
136 static int next_states[] =
152 /* commands received by milter */
153 static cmdfct cmds[] =
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 }
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)
178 ** MI_ENGINE -- receive commands and process them
181 ** ctx -- context structure
184 ** MI_FAILURE/MI_SUCCESS
193 int ret = MI_SUCCESS;
194 int ncmds = sizeof(cmds) / sizeof(cmdfct);
195 int curstate = ST_INIT;
202 struct timeval timeout;
203 int (*f) __P((genarg *));
204 sfsistat (*fi_abort) __P((SMFICTX *));
205 sfsistat (*fi_close) __P((SMFICTX *));
209 fi_abort = ctx->ctx_smfi->xxfi_abort;
210 mi_clr_macros(ctx, 0);
215 /* call abort only if in a mail transaction */
216 call_abort = ST_IN_MAIL(curstate);
217 timeout.tv_sec = ctx->ctx_timeout;
219 if (mi_stop() == MILTER_ABRT)
221 if (ctx->ctx_dbg > 3)
222 sm_dprintf("[%d] milter_abort\n",
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.
239 if ((buf = mi_rd_cmd(sd, &timeout, &cmd, &len,
240 ctx->ctx_smfi->xxfi_name)) == NULL &&
241 cmd < SMFIC_VALIDCMD)
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);
248 ** eof is currently treated as failure ->
249 ** abort() instead of close(), otherwise use:
250 ** if (cmd != SMFIC_EOF)
256 if (ctx->ctx_dbg > 4)
257 sm_dprintf("[%d] got cmd '%c' len %d\n",
258 (int) ctx->ctx_id, cmd, (int) len);
259 for (i = 0; i < ncmds; i++)
261 if (cmd == cmds[i].cm_cmd)
266 /* unknown command */
267 if (ctx->ctx_dbg > 1)
268 sm_dprintf("[%d] cmd '%c' unknown\n",
269 (int) ctx->ctx_id, cmd);
273 if ((f = cmds[i].cm_fct) == NULL)
276 if (ctx->ctx_dbg > 1)
277 sm_dprintf("[%d] cmd '%c' not impl\n",
278 (int) ctx->ctx_id, cmd);
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",
288 curstate, newstate, next_states[curstate]);
290 if (newstate != ST_NONE && !trans_ok(curstate, newstate))
292 if (ctx->ctx_dbg > 1)
293 sm_dprintf("[%d] abort: cur %d (%x) new %d (%x) next %x\n",
295 curstate, MI_MASK(curstate),
296 newstate, MI_MASK(newstate),
297 next_states[curstate]);
299 /* call abort only if in a mail transaction */
300 if (fi_abort != NULL && call_abort)
301 (void) (*fi_abort)(ctx);
304 ** try to reach the new state from HELO
305 ** if it can't be reached, ignore the command.
309 if (!trans_ok(curstate, newstate))
321 if (newstate != ST_NONE)
324 ctx->ctx_state = curstate;
326 arg.a_idx = cmds[i].cm_macros;
328 /* call function to deal with command */
330 if (r != _SMFIS_KEEP && buf != NULL)
335 if (sendreply(r, sd, &timeout, ctx) != MI_SUCCESS)
341 call_abort = ST_IN_MAIL(curstate);
342 if (r == SMFIS_ACCEPT)
344 /* accept mail, no further actions taken */
347 else if (r == SMFIS_REJECT || r == SMFIS_DISCARD ||
351 ** further actions depend on current state
352 ** if the IGNO bit is set: "ignore" the error,
353 ** i.e., stay in the current state
355 if (!bitset(CT_IGNO, cmds[i].cm_todo))
358 else if (r == _SMFIS_ABORT)
360 if (ctx->ctx_dbg > 5)
361 sm_dprintf("[%d] function returned abort\n",
366 } while (!bitset(CT_END, cmds[i].cm_todo));
368 if (ret != MI_SUCCESS)
370 /* call abort only if in a mail transaction */
371 if (fi_abort != NULL && call_abort)
372 (void) (*fi_abort)(ctx);
375 /* close must always be called */
376 if ((fi_close = ctx->ctx_smfi->xxfi_close) != NULL)
377 (void) (*fi_close)(ctx);
378 if (r != _SMFIS_KEEP && buf != NULL)
380 mi_clr_macros(ctx, 0);
384 ** SENDREPLY -- send a reply to the MTA
388 ** sd -- socket descriptor
389 ** timeout_ptr -- (ptr to) timeout to use for sending
390 ** ctx -- context structure
393 ** MI_SUCCESS/MI_FAILURE
397 sendreply(r, sd, timeout_ptr, ctx)
400 struct timeval *timeout_ptr;
403 int ret = MI_SUCCESS;
408 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_CONTINUE, NULL, 0);
412 if (ctx->ctx_reply != NULL &&
413 ((r == SMFIS_TEMPFAIL && *ctx->ctx_reply == '4') ||
414 (r == SMFIS_REJECT && *ctx->ctx_reply == '5')))
416 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_REPLYCODE,
418 strlen(ctx->ctx_reply) + 1);
419 free(ctx->ctx_reply);
420 ctx->ctx_reply = NULL;
424 ret = mi_wr_cmd(sd, timeout_ptr, r == SMFIS_REJECT ?
425 SMFIR_REJECT : SMFIR_TEMPFAIL, NULL, 0);
429 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_DISCARD, NULL, 0);
432 ret = mi_wr_cmd(sd, timeout_ptr, SMFIR_ACCEPT, NULL, 0);
436 char buf[MILTER_OPTLEN];
439 v = htonl(ctx->ctx_smfi->xxfi_version);
440 (void) memcpy(&(buf[0]), (void *) &v, MILTER_LEN_BYTES);
441 v = htonl(ctx->ctx_smfi->xxfi_flags);
442 (void) memcpy(&(buf[MILTER_LEN_BYTES]), (void *) &v,
444 v = htonl(ctx->ctx_pflags);
445 (void) memcpy(&(buf[MILTER_LEN_BYTES * 2]), (void *) &v,
447 ret = mi_wr_cmd(sd, timeout_ptr, SMFIC_OPTNEG, buf,
451 default: /* don't send a reply */
458 ** CLR_MACROS -- clear set of macros starting from a given index
461 ** ctx -- context structure
462 ** m -- index from which to clear all macros
468 mi_clr_macros(ctx, m)
474 for (i = m; i < MAX_MACROS_ENTRIES; i++)
476 if (ctx->ctx_mac_ptr[i] != NULL)
478 free(ctx->ctx_mac_ptr[i]);
479 ctx->ctx_mac_ptr[i] = NULL;
481 if (ctx->ctx_mac_buf[i] != NULL)
483 free(ctx->ctx_mac_buf[i]);
484 ctx->ctx_mac_buf[i] = NULL;
489 ** ST_OPTIONNEG -- negotiate options
492 ** g -- generic argument structure
495 ** abort/send options/continue
504 if (g == NULL || g->a_ctx->ctx_smfi == NULL)
505 return SMFIS_CONTINUE;
506 mi_clr_macros(g->a_ctx, g->a_idx + 1);
508 /* check for minimum length */
509 if (g->a_len < MILTER_OPTLEN)
512 "%s: st_optionneg[%d]: len too short %d < %d",
513 g->a_ctx->ctx_smfi->xxfi_name,
514 (int) g->a_ctx->ctx_id, (int) g->a_len,
519 (void) memcpy((void *) &i, (void *) &(g->a_buf[0]),
522 if (v < g->a_ctx->ctx_smfi->xxfi_version)
524 /* hard failure for now! */
526 "%s: st_optionneg[%d]: version mismatch MTA: %d < milter: %d",
527 g->a_ctx->ctx_smfi->xxfi_name,
528 (int) g->a_ctx->ctx_id, (int) v,
529 g->a_ctx->ctx_smfi->xxfi_version);
533 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES]),
537 /* no flags? set to default value for V1 actions */
540 i = g->a_ctx->ctx_smfi->xxfi_flags;
544 "%s: st_optionneg[%d]: 0x%x does not fulfill action requirements 0x%x",
545 g->a_ctx->ctx_smfi->xxfi_name,
546 (int) g->a_ctx->ctx_id, v, i);
550 (void) memcpy((void *) &i, (void *) &(g->a_buf[MILTER_LEN_BYTES * 2]),
554 /* no flags? set to default value for V1 protocol */
557 i = g->a_ctx->ctx_pflags;
561 "%s: st_optionneg[%d]: 0x%x does not fulfill protocol requirements 0x%x",
562 g->a_ctx->ctx_smfi->xxfi_name,
563 (int) g->a_ctx->ctx_id, v, i);
567 return _SMFIS_OPTIONS;
570 ** ST_CONNECTINFO -- receive connection information
573 ** g -- generic argument structure
576 ** continue or filter-specified value
586 unsigned short port = 0;
588 sfsistat (*fi_connect) __P((SMFICTX *, char *, _SOCK_ADDR *));
592 mi_clr_macros(g->a_ctx, g->a_idx + 1);
593 if (g->a_ctx->ctx_smfi == NULL ||
594 (fi_connect = g->a_ctx->ctx_smfi->xxfi_connect) == NULL)
595 return SMFIS_CONTINUE;
600 while (s[i] != '\0' && i <= l)
605 /* Move past trailing \0 in host string */
608 memset(&sockaddr, '\0', sizeof sockaddr);
609 if (family != SMFIA_UNKNOWN)
611 (void) memcpy((void *) &port, (void *) (s + i),
613 if ((i += sizeof port) >= l)
616 "%s: connect[%d]: wrong len %d >= %d",
617 g->a_ctx->ctx_smfi->xxfi_name,
618 (int) g->a_ctx->ctx_id, (int) i, (int) l);
622 /* make sure string is terminated */
623 if (s[l - 1] != '\0')
626 if (family == SMFIA_INET)
628 if (inet_aton(s + i, (struct in_addr *) &sockaddr.sin.sin_addr)
632 "%s: connect[%d]: inet_aton failed",
633 g->a_ctx->ctx_smfi->xxfi_name,
634 (int) g->a_ctx->ctx_id);
637 sockaddr.sa.sa_family = AF_INET;
639 sockaddr.sin.sin_port = port;
642 # endif /* NETINET */
644 if (family == SMFIA_INET6)
646 if (mi_inet_pton(AF_INET6, s + i,
647 &sockaddr.sin6.sin6_addr) != 1)
650 "%s: connect[%d]: mi_inet_pton failed",
651 g->a_ctx->ctx_smfi->xxfi_name,
652 (int) g->a_ctx->ctx_id);
655 sockaddr.sa.sa_family = AF_INET6;
657 sockaddr.sin6.sin6_port = port;
660 # endif /* NETINET6 */
662 if (family == SMFIA_UNIX)
664 if (sm_strlcpy(sockaddr.sunix.sun_path, s + i,
665 sizeof sockaddr.sunix.sun_path) >=
666 sizeof sockaddr.sunix.sun_path)
669 "%s: connect[%d]: path too long",
670 g->a_ctx->ctx_smfi->xxfi_name,
671 (int) g->a_ctx->ctx_id);
674 sockaddr.sunix.sun_family = AF_UNIX;
677 # endif /* NETUNIX */
680 "%s: connect[%d]: unknown family %d",
681 g->a_ctx->ctx_smfi->xxfi_name,
682 (int) g->a_ctx->ctx_id, family);
686 return (*fi_connect)(g->a_ctx, g->a_buf,
687 family != SMFIA_UNKNOWN ? &sockaddr : NULL);
690 ** ST_EOH -- end of headers
693 ** g -- generic argument structure
696 ** continue or filter-specified value
703 sfsistat (*fi_eoh) __P((SMFICTX *));
707 if (g->a_ctx->ctx_smfi != NULL &&
708 (fi_eoh = g->a_ctx->ctx_smfi->xxfi_eoh) != NULL)
709 return (*fi_eoh)(g->a_ctx);
710 return SMFIS_CONTINUE;
713 ** ST_HELO -- helo/ehlo command
716 ** g -- generic argument structure
719 ** continue or filter-specified value
725 sfsistat (*fi_helo) __P((SMFICTX *, char *));
729 mi_clr_macros(g->a_ctx, g->a_idx + 1);
730 if (g->a_ctx->ctx_smfi != NULL &&
731 (fi_helo = g->a_ctx->ctx_smfi->xxfi_helo) != NULL)
732 return (*fi_helo)(g->a_ctx, g->a_buf);
733 return SMFIS_CONTINUE;
736 ** ST_HEADER -- header line
739 ** g -- generic argument structure
742 ** continue or filter-specified value
750 sfsistat (*fi_header) __P((SMFICTX *, char *, char *));
754 if (g->a_ctx->ctx_smfi == NULL ||
755 (fi_header = g->a_ctx->ctx_smfi->xxfi_header) == NULL)
756 return SMFIS_CONTINUE;
757 if (dec_arg2(g->a_buf, g->a_len, &hf, &hv) == MI_SUCCESS)
758 return (*fi_header)(g->a_ctx, hf, hv);
763 #define ARGV_FCT(lf, rf, idx) \
765 sfsistat (*lf) __P((SMFICTX *, char **)); \
769 return _SMFIS_ABORT; \
770 mi_clr_macros(g->a_ctx, g->a_idx + 1); \
771 if (g->a_ctx->ctx_smfi == NULL || \
772 (lf = g->a_ctx->ctx_smfi->rf) == NULL) \
773 return SMFIS_CONTINUE; \
774 if ((argv = dec_argv(g->a_buf, g->a_len)) == NULL) \
775 return _SMFIS_ABORT; \
776 r = (*lf)(g->a_ctx, argv); \
781 ** ST_SENDER -- MAIL FROM command
784 ** g -- generic argument structure
787 ** continue or filter-specified value
794 ARGV_FCT(fi_envfrom, xxfi_envfrom, CI_MAIL)
797 ** ST_RCPT -- RCPT TO command
800 ** g -- generic argument structure
803 ** continue or filter-specified value
810 ARGV_FCT(fi_envrcpt, xxfi_envrcpt, CI_RCPT)
813 ** ST_MACROS -- deal with macros received from the MTA
816 ** g -- generic argument structure
822 ** set pointer in macro array to current values.
832 if (g == NULL || g->a_len < 1)
834 if ((argv = dec_argv(g->a_buf + 1, g->a_len - 1)) == NULL)
854 if (g->a_ctx->ctx_mac_ptr[i] != NULL)
855 free(g->a_ctx->ctx_mac_ptr[i]);
856 if (g->a_ctx->ctx_mac_buf[i] != NULL)
857 free(g->a_ctx->ctx_mac_buf[i]);
858 g->a_ctx->ctx_mac_ptr[i] = argv;
859 g->a_ctx->ctx_mac_buf[i] = g->a_buf;
863 ** ST_QUIT -- quit command
866 ** g -- generic argument structure
876 return _SMFIS_NOREPLY;
879 ** ST_BODYCHUNK -- deal with a piece of the mail body
882 ** g -- generic argument structure
885 ** continue or filter-specified value
892 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t));
896 if (g->a_ctx->ctx_smfi != NULL &&
897 (fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL)
898 return (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf,
900 return SMFIS_CONTINUE;
903 ** ST_BODYEND -- deal with the last piece of the mail body
906 ** g -- generic argument structure
909 ** continue or filter-specified value
912 ** sends a reply for the body part (if non-empty).
920 sfsistat (*fi_body) __P((SMFICTX *, unsigned char *, size_t));
921 sfsistat (*fi_eom) __P((SMFICTX *));
926 if (g->a_ctx->ctx_smfi != NULL)
928 if ((fi_body = g->a_ctx->ctx_smfi->xxfi_body) != NULL &&
932 struct timeval timeout;
934 timeout.tv_sec = g->a_ctx->ctx_timeout;
936 sd = g->a_ctx->ctx_sd;
937 r = (*fi_body)(g->a_ctx, (unsigned char *)g->a_buf,
939 if (r != SMFIS_CONTINUE &&
940 sendreply(r, sd, &timeout, g->a_ctx) != MI_SUCCESS)
944 if (r == SMFIS_CONTINUE &&
945 (fi_eom = g->a_ctx->ctx_smfi->xxfi_eom) != NULL)
946 return (*fi_eom)(g->a_ctx);
950 ** ST_ABORTFCT -- deal with aborts
953 ** g -- generic argument structure
956 ** abort or filter-specified value
963 sfsistat (*fi_abort) __P((SMFICTX *));
967 if (g != NULL && g->a_ctx->ctx_smfi != NULL &&
968 (fi_abort = g->a_ctx->ctx_smfi->xxfi_abort) != NULL)
969 (void) (*fi_abort)(g->a_ctx);
970 return _SMFIS_NOREPLY;
973 ** TRANS_OK -- is the state transition ok?
980 ** state transition ok
992 /* is this state transition allowed? */
993 if ((MI_MASK(new) & next_states[s]) != 0)
997 ** no: try next state;
998 ** this works since the relevant states are ordered
999 ** strict sequentially
1005 ** can we actually "skip" this state?
1006 ** see fix_stm() which sets this bit for those
1007 ** states which the filter program is not interested in
1010 if (bitset(NX_SKIP, next_states[n]))
1014 } while (s <= ST_LAST);
1018 ** FIX_STM -- add "skip" bits to the state transition table
1021 ** ctx -- context structure
1027 ** may change state transition table.
1036 if (ctx == NULL || ctx->ctx_smfi == NULL)
1038 fl = ctx->ctx_pflags;
1039 if (bitset(SMFIP_NOCONNECT, fl))
1040 next_states[ST_CONN] |= NX_SKIP;
1041 if (bitset(SMFIP_NOHELO, fl))
1042 next_states[ST_HELO] |= NX_SKIP;
1043 if (bitset(SMFIP_NOMAIL, fl))
1044 next_states[ST_MAIL] |= NX_SKIP;
1045 if (bitset(SMFIP_NORCPT, fl))
1046 next_states[ST_RCPT] |= NX_SKIP;
1047 if (bitset(SMFIP_NOHDRS, fl))
1048 next_states[ST_HDRS] |= NX_SKIP;
1049 if (bitset(SMFIP_NOEOH, fl))
1050 next_states[ST_EOHS] |= NX_SKIP;
1051 if (bitset(SMFIP_NOBODY, fl))
1052 next_states[ST_BODY] |= NX_SKIP;
1055 ** DEC_ARGV -- split a buffer into a list of strings, NULL terminated
1058 ** buf -- buffer with several strings
1059 ** len -- length of buffer
1062 ** array of pointers to the individual strings
1075 for (i = 0; i < len; i++)
1083 /* last entry is only for the name */
1084 s = (char **)malloc((nelem + 1) * (sizeof *s));
1088 for (i = 0, elem = 0; i < len && elem < nelem; i++)
1091 s[++elem] = &(buf[i + 1]);
1094 /* overwrite last entry */
1099 ** DEC_ARG2 -- split a buffer into two strings
1102 ** buf -- buffer with two strings
1103 ** len -- length of buffer
1104 ** s1,s2 -- pointer to result strings
1107 ** MI_FAILURE/MI_SUCCESS
1111 dec_arg2(buf, len, s1, s2)
1120 for (i = 1; i < len && buf[i] != '\0'; i++)
1128 ** SENDOK -- is it ok for the filter to send stuff to the MTA?
1131 ** ctx -- context structure
1132 ** flag -- flag to check
1135 ** sending allowed (in current state)
1139 mi_sendok(ctx, flag)
1143 if (ctx == NULL || ctx->ctx_smfi == NULL)
1146 /* did the milter request this operation? */
1147 if (flag != 0 && !bitset(flag, ctx->ctx_smfi->xxfi_flags))
1150 /* are we in the correct state? It must be "End of Message". */
1151 return ctx->ctx_state == ST_ENDM;