3 * mf.c -- mail filter subroutines
15 static char *getcpy (char *);
16 static char *add (char *, char *);
17 static void compress (char *, char *);
18 static int isat (char *);
19 static int parse_address (void);
20 static int phrase (char *);
21 static int route_addr (char *);
22 static int local_part (char *);
23 static int domain (char *);
24 static int route (char *);
25 static int my_lex (char *);
34 /* causes compiles to blow up because the symbol _cleanup is undefined
35 where did this ever come from? */
41 if ((p = malloc ((size_t) (strlen (s) + 2))))
48 add (char *s1, char *s2)
55 if ((p = malloc ((size_t) (strlen (s1) + strlen (s2) + 2))))
56 sprintf (p, "%s%s", s2, s1);
64 return (strncmp (string, "From ", 5) == 0
65 || strncmp (string, ">From ", 6) == 0);
70 lequal (char *a, char *b)
76 char c1 = islower (*a) ? toupper (*a) : *a;
77 char c2 = islower (*b) ? toupper (*b) : *b;
87 * seekadrx() is tricky. We want to cover both UUCP-style and ARPA-style
88 * addresses, so for each list of addresses we see if we can find some
89 * character to give us a hint.
93 #define CHKADR 0 /* undertermined address style */
94 #define UNIXDR 1 /* UNIX-style address */
95 #define ARPADR 2 /* ARPAnet-style address */
98 static char *punctuators = ";<>.()[]";
99 static char *vp = NULL;
100 static char *tp = NULL;
102 static struct adrx adrxs1;
106 seekadrx (char *addrs)
108 static int state = CHKADR;
110 register struct adrx *adrxp;
113 for (state = UNIXDR, cp = addrs; *cp; cp++)
114 if (strchr(punctuators, *cp)) {
121 adrxp = uucpadrx (addrs);
126 adrxp = getadrx (addrs);
138 * uucpadrx() implements a partial UUCP-style address parser. It's based
139 * on the UUCP notion that addresses are separated by spaces or commas.
144 uucpadrx (char *addrs)
146 register char *cp, *wp, *xp, *yp, *zp;
147 register struct adrx *adrxp = &adrxs1;
150 vp = tp = getcpy (addrs);
151 compress (addrs, vp);
160 for (cp = tp; isspace (*cp); cp++)
168 if ((wp = strchr(cp, ',')) == NULL) {
169 if ((wp = strchr(cp, ' ')) != NULL) {
171 while (isspace (*xp))
173 if (*xp != 0 && isat (--xp)) {
175 while (isspace (*yp))
178 if ((zp = strchr(yp, ' ')) != NULL)
197 adrxp->text = getcpy (cp);
199 adrxp->host = adrxp->path = NULL;
200 if ((wp = strrchr(cp, '@')) != NULL) {
202 adrxp->host = *wp ? wp : NULL;
205 for (wp = cp + strlen (cp) - 4; wp >= cp; wp--)
208 adrxp->host = wp + 3;
211 adrxp->pers = adrxp->grp = adrxp->note = adrxp->err = NULL;
219 compress (char *fp, char *tp)
221 register char c, *cp;
223 for (c = ' ', cp = tp; (*tp = *fp++) != 0;)
231 if (c == ' ' && cp < tp)
239 return (strncmp (p, " AT ", 4)
240 && strncmp (p, " At ", 4)
241 && strncmp (p, " aT ", 4)
242 && strncmp (p, " at ", 4) ? FALSE : TRUE);
248 * getadrx() implements a partial 822-style address parser. The parser
249 * is neither complete nor correct. It does however recognize nearly all
250 * of the 822 address syntax. In addition it handles the majority of the
251 * 733 syntax as well. Most problems arise from trying to accomodate both.
253 * In terms of 822, the route-specification in
255 * "<" [route] local-part "@" domain ">"
257 * is parsed and returned unchanged. Multiple at-signs are compressed
258 * via source-routing. Recursive groups are not allowed as per the
261 * In terms of 733, " at " is recognized as equivalent to "@".
263 * In terms of both the parser will not complain about missing hosts.
267 * We should not allow addresses like
269 * Marshall T. Rose <MRose@UCI>
271 * but should insist on
273 * "Marshall T. Rose" <MRose@UCI>
275 * Unfortunately, a lot of mailers stupidly let people get away with this.
279 * We should not allow addresses like
283 * but should insist on
287 * Unfortunately, a lot of mailers stupidly let people's UAs get away with
292 * We should not allow addresses like
294 * @UCI:MRose@UCI-750a
296 * but should insist on
298 * Marshall Rose <@UCI:MRose@UCI-750a>
300 * Unfortunately, a lot of mailers stupidly do this.
324 static struct specials special[] = {
341 static int glevel = 0;
342 static int ingrp = 0;
343 static int last_lex = LX_END;
345 static char *dp = NULL;
346 static char *cp = NULL;
347 static char *ap = NULL;
348 static char *pers = NULL;
349 static char *mbox = NULL;
350 static char *host = NULL;
351 static char *path = NULL;
352 static char *grp = NULL;
353 static char *note = NULL;
354 static char err[BUFSIZ];
355 static char adr[BUFSIZ];
357 static struct adrx adrxs2;
361 getadrx (char *addrs)
364 register struct adrx *adrxp = &adrxs2;
378 pers = mbox = host = path = grp = note = NULL;
382 dp = cp = getcpy (addrs ? addrs : "");
392 switch (parse_address ()) {
404 default: /* catch trailing comments */
429 while (isspace (*ap))
432 sprintf (adr, "%.*s", cp - ap, ap);
435 bp = adr + strlen (adr) - 1;
436 if (*bp == ',' || *bp == ';' || *bp == '\n')
445 adrxp->ingrp = ingrp;
447 adrxp->err = err[0] ? err : NULL;
460 switch (my_lex (buffer)) {
463 pers = getcpy (buffer);
468 strcpy (err, "extraneous semi-colon");
481 case LX_LBRK: /* sigh (2) */
484 case LX_AT: /* sigh (3) */
486 if (route_addr (buffer) == NOTOK)
488 return OK; /* why be choosy? */
491 sprintf (err, "illegal address construct (%s)", buffer);
495 switch (my_lex (buffer)) {
498 pers = add (buffer, add (" ", pers));
499 more_phrase: ; /* sigh (1) */
500 if (phrase (buffer) == NOTOK)
506 if (route_addr (buffer) == NOTOK)
508 if (last_lex == LX_RBRK)
510 sprintf (err, "missing right-bracket (%s)", buffer);
516 sprintf (err, "nested groups not allowed (%s)", pers);
519 grp = add (": ", pers);
525 switch (my_lex (buffer)) {
527 case LX_END: /* tsk, tsk */
536 return parse_address ();
540 case LX_DOT: /* sigh (1) */
541 pers = add (".", pers);
545 sprintf (err, "no mailbox in address, only a phrase (%s%s)",
557 mbox = add (buffer, pers);
559 if (route_addr (buffer) == NOTOK)
567 if (domain (buffer) == NOTOK)
573 strcpy (err, "extraneous semi-colon");
581 sprintf (err, "junk after local@domain (%s)", buffer);
585 case LX_SEMI: /* no host */
589 if (last_lex == LX_SEMI && glevel-- <= 0) {
590 strcpy (err, "extraneous semi-colon");
598 sprintf (err, "missing mailbox (%s)", buffer);
605 phrase (char *buffer)
608 switch (my_lex (buffer)) {
611 pers = add (buffer, add (" ", pers));
621 route_addr (char *buffer)
623 register char *pp = cp;
625 if (my_lex (buffer) == LX_AT) {
626 if (route (buffer) == NOTOK)
632 if (local_part (buffer) == NOTOK)
637 return domain (buffer);
639 case LX_SEMI: /* if in group */
640 case LX_RBRK: /* no host */
646 sprintf (err, "no at-sign after local-part (%s)", buffer);
653 local_part (char *buffer)
658 switch (my_lex (buffer)) {
661 mbox = add (buffer, mbox);
665 sprintf (err, "no mailbox in local-part (%s)", buffer);
669 switch (my_lex (buffer)) {
671 mbox = add (buffer, mbox);
682 domain (char *buffer)
685 switch (my_lex (buffer)) {
688 host = add (buffer, host);
692 sprintf (err, "no sub-domain in domain-part of address (%s)", buffer);
696 switch (my_lex (buffer)) {
698 host = add (buffer, host);
701 case LX_AT: /* sigh (0) */
702 mbox = add (host, add ("%", mbox));
720 switch (my_lex (buffer)) {
723 path = add (buffer, path);
727 sprintf (err, "no sub-domain in domain-part of address (%s)", buffer);
730 switch (my_lex (buffer)) {
732 path = add (buffer, path);
734 switch (my_lex (buffer)) {
739 path = add (buffer, path);
743 sprintf (err, "no at-sign found for next domain in route (%s)",
750 case LX_AT: /* XXX */
752 path = add (buffer, path);
756 path = add (buffer, path);
760 sprintf (err, "no colon found to terminate route (%s)", buffer);
768 my_lex (char *buffer)
771 register char c, *bp;
776 return (last_lex = LX_END);
784 return (last_lex = LX_END);
788 for (*bp++ = c, i = 0;;)
792 return (last_lex = LX_ERR);
795 if ((c = *cp++) == 0) {
797 return (last_lex = LX_ERR);
810 note = note ? add (buffer, add (" ", note))
812 return my_lex (buffer);
821 return (last_lex = LX_ERR);
824 if ((c = *cp++) == 0) {
826 return (last_lex = LX_ERR);
834 return (last_lex = LX_QSTR);
842 return (last_lex = LX_ERR);
845 if ((c = *cp++) == 0) {
847 return (last_lex = LX_ERR);
855 return (last_lex = LX_DLIT);
860 for (i = 0; special[i].lx_chr != 0; i++)
861 if (c == special[i].lx_chr)
862 return (last_lex = special[i].lx_val);
865 return (last_lex = LX_ERR);
868 if ((c = *cp++) == 0)
870 for (i = 0; special[i].lx_chr != 0; i++)
871 if (c == special[i].lx_chr)
873 if (iscntrl (c) || isspace (c))
883 last_lex = !gotat || cp == NULL || strchr(cp, '<') != NULL
890 legal_person (char *p)
894 static char buffer[BUFSIZ];
898 for (cp = p; *cp; cp++)
899 for (i = 0; special[i].lx_chr; i++)
900 if (*cp == special[i].lx_chr) {
901 sprintf (buffer, "\"%s\"", p);
910 mfgets (FILE *in, char **bp)
913 register char *cp, *dp, *ep;
915 static char *pp = NULL;
918 if (!(pp = malloc ((size_t) (len = BUFSIZ))))
921 for (ep = (cp = pp) + len - 2;;) {
922 switch (i = getc (in)) {
940 if (cp == pp) /* end of headers, gobble it */
942 switch (i = getc (in)) {
943 default: /* end of line */
944 case '\n': /* end of headers, save for next call */
948 case ' ': /* continue headers */
952 } /* fall into default case */
959 if (!(dp = realloc (pp, (size_t) (len += BUFSIZ)))) {
965 cp += dp - pp, ep = (pp = cp) + len - 2;