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 *);
39 if ((p = malloc ((size_t) (strlen (s) + 2))))
46 add (char *s1, char *s2)
53 if ((p = malloc ((size_t) (strlen (s1) + strlen (s2) + 2))))
54 sprintf (p, "%s%s", s2, s1);
62 return (strncmp (string, "From ", 5) == 0
63 || strncmp (string, ">From ", 6) == 0);
68 lequal (char *a, char *b)
74 char c1 = islower (*a) ? toupper (*a) : *a;
75 char c2 = islower (*b) ? toupper (*b) : *b;
85 * seekadrx() is tricky. We want to cover both UUCP-style and ARPA-style
86 * addresses, so for each list of addresses we see if we can find some
87 * character to give us a hint.
91 #define CHKADR 0 /* undertermined address style */
92 #define UNIXDR 1 /* UNIX-style address */
93 #define ARPADR 2 /* ARPAnet-style address */
96 static char *punctuators = ";<>.()[]";
97 static char *vp = NULL;
98 static char *tp = NULL;
100 static struct adrx adrxs1;
104 seekadrx (char *addrs)
106 static int state = CHKADR;
108 register struct adrx *adrxp;
111 for (state = UNIXDR, cp = addrs; *cp; cp++)
112 if (strchr(punctuators, *cp)) {
119 adrxp = uucpadrx (addrs);
124 adrxp = getadrx (addrs);
136 * uucpadrx() implements a partial UUCP-style address parser. It's based
137 * on the UUCP notion that addresses are separated by spaces or commas.
142 uucpadrx (char *addrs)
144 register char *cp, *wp, *xp, *yp, *zp;
145 register struct adrx *adrxp = &adrxs1;
148 vp = tp = getcpy (addrs);
149 compress (addrs, vp);
158 for (cp = tp; isspace (*cp); cp++)
166 if ((wp = strchr(cp, ',')) == NULL)
167 if ((wp = strchr(cp, ' ')) != NULL) {
169 while (isspace (*xp))
171 if (*xp != 0 && isat (--xp)) {
173 while (isspace (*yp))
176 if ((zp = strchr(yp, ' ')) != NULL)
193 adrxp->text = getcpy (cp);
195 adrxp->host = adrxp->path = NULL;
196 if ((wp = strrchr(cp, '@')) != NULL) {
198 adrxp->host = *wp ? wp : NULL;
201 for (wp = cp + strlen (cp) - 4; wp >= cp; wp--)
204 adrxp->host = wp + 3;
207 adrxp->pers = adrxp->grp = adrxp->note = adrxp->err = NULL;
215 compress (char *fp, char *tp)
217 register char c, *cp;
219 for (c = ' ', cp = tp; (*tp = *fp++) != 0;)
227 if (c == ' ' && cp < tp)
235 return (strncmp (p, " AT ", 4)
236 && strncmp (p, " At ", 4)
237 && strncmp (p, " aT ", 4)
238 && strncmp (p, " at ", 4) ? FALSE : TRUE);
244 * getadrx() implements a partial 822-style address parser. The parser
245 * is neither complete nor correct. It does however recognize nearly all
246 * of the 822 address syntax. In addition it handles the majority of the
247 * 733 syntax as well. Most problems arise from trying to accomodate both.
249 * In terms of 822, the route-specification in
251 * "<" [route] local-part "@" domain ">"
253 * is parsed and returned unchanged. Multiple at-signs are compressed
254 * via source-routing. Recursive groups are not allowed as per the
257 * In terms of 733, " at " is recognized as equivalent to "@".
259 * In terms of both the parser will not complain about missing hosts.
263 * We should not allow addresses like
265 * Marshall T. Rose <MRose@UCI>
267 * but should insist on
269 * "Marshall T. Rose" <MRose@UCI>
271 * Unfortunately, a lot of mailers stupidly let people get away with this.
275 * We should not allow addresses like
279 * but should insist on
283 * Unfortunately, a lot of mailers stupidly let people's UAs get away with
288 * We should not allow addresses like
290 * @UCI:MRose@UCI-750a
292 * but should insist on
294 * Marshall Rose <@UCI:MRose@UCI-750a>
296 * Unfortunately, a lot of mailers stupidly do this.
320 static struct specials special[] = {
337 static int glevel = 0;
338 static int ingrp = 0;
339 static int last_lex = LX_END;
341 static char *dp = NULL;
342 static char *cp = NULL;
343 static char *ap = NULL;
344 static char *pers = NULL;
345 static char *mbox = NULL;
346 static char *host = NULL;
347 static char *path = NULL;
348 static char *grp = NULL;
349 static char *note = NULL;
350 static char err[BUFSIZ];
351 static char adr[BUFSIZ];
353 static struct adrx adrxs2;
357 getadrx (char *addrs)
360 register struct adrx *adrxp = &adrxs2;
374 pers = mbox = host = path = grp = note = NULL;
378 dp = cp = getcpy (addrs ? addrs : "");
388 switch (parse_address ()) {
400 default: /* catch trailing comments */
425 while (isspace (*ap))
428 sprintf (adr, "%.*s", cp - ap, ap);
431 bp = adr + strlen (adr) - 1;
432 if (*bp == ',' || *bp == ';' || *bp == '\n')
441 adrxp->ingrp = ingrp;
443 adrxp->err = err[0] ? err : NULL;
456 switch (my_lex (buffer)) {
459 pers = getcpy (buffer);
464 strcpy (err, "extraneous semi-colon");
477 case LX_LBRK: /* sigh (2) */
480 case LX_AT: /* sigh (3) */
482 if (route_addr (buffer) == NOTOK)
484 return OK; /* why be choosy? */
487 sprintf (err, "illegal address construct (%s)", buffer);
491 switch (my_lex (buffer)) {
494 pers = add (buffer, add (" ", pers));
495 more_phrase: ; /* sigh (1) */
496 if (phrase (buffer) == NOTOK)
502 if (route_addr (buffer) == NOTOK)
504 if (last_lex == LX_RBRK)
506 sprintf (err, "missing right-bracket (%s)", buffer);
512 sprintf (err, "nested groups not allowed (%s)", pers);
515 grp = add (": ", pers);
521 switch (my_lex (buffer)) {
523 case LX_END: /* tsk, tsk */
532 return parse_address ();
536 case LX_DOT: /* sigh (1) */
537 pers = add (".", pers);
541 sprintf (err, "no mailbox in address, only a phrase (%s%s)",
553 mbox = add (buffer, pers);
555 if (route_addr (buffer) == NOTOK)
563 if (domain (buffer) == NOTOK)
569 strcpy (err, "extraneous semi-colon");
577 sprintf (err, "junk after local@domain (%s)", buffer);
581 case LX_SEMI: /* no host */
585 if (last_lex == LX_SEMI && glevel-- <= 0) {
586 strcpy (err, "extraneous semi-colon");
594 sprintf (err, "missing mailbox (%s)", buffer);
601 phrase (char *buffer)
604 switch (my_lex (buffer)) {
607 pers = add (buffer, add (" ", pers));
617 route_addr (char *buffer)
619 register char *pp = cp;
621 if (my_lex (buffer) == LX_AT) {
622 if (route (buffer) == NOTOK)
628 if (local_part (buffer) == NOTOK)
633 return domain (buffer);
635 case LX_SEMI: /* if in group */
636 case LX_RBRK: /* no host */
642 sprintf (err, "no at-sign after local-part (%s)", buffer);
649 local_part (char *buffer)
654 switch (my_lex (buffer)) {
657 mbox = add (buffer, mbox);
661 sprintf (err, "no mailbox in local-part (%s)", buffer);
665 switch (my_lex (buffer)) {
667 mbox = add (buffer, mbox);
678 domain (char *buffer)
681 switch (my_lex (buffer)) {
684 host = add (buffer, host);
688 sprintf (err, "no sub-domain in domain-part of address (%s)", buffer);
692 switch (my_lex (buffer)) {
694 host = add (buffer, host);
697 case LX_AT: /* sigh (0) */
698 mbox = add (host, add ("%", mbox));
716 switch (my_lex (buffer)) {
719 path = add (buffer, path);
723 sprintf (err, "no sub-domain in domain-part of address (%s)", buffer);
726 switch (my_lex (buffer)) {
728 path = add (buffer, path);
730 switch (my_lex (buffer)) {
735 path = add (buffer, path);
739 sprintf (err, "no at-sign found for next domain in route (%s)",
746 case LX_AT: /* XXX */
748 path = add (buffer, path);
752 path = add (buffer, path);
756 sprintf (err, "no colon found to terminate route (%s)", buffer);
764 my_lex (char *buffer)
767 register char c, *bp;
772 return (last_lex = LX_END);
780 return (last_lex = LX_END);
784 for (*bp++ = c, i = 0;;)
788 return (last_lex = LX_ERR);
791 if ((c = *cp++) == 0) {
793 return (last_lex = LX_ERR);
806 note = note ? add (buffer, add (" ", note))
808 return my_lex (buffer);
817 return (last_lex = LX_ERR);
820 if ((c = *cp++) == 0) {
822 return (last_lex = LX_ERR);
830 return (last_lex = LX_QSTR);
838 return (last_lex = LX_ERR);
841 if ((c = *cp++) == 0) {
843 return (last_lex = LX_ERR);
851 return (last_lex = LX_DLIT);
856 for (i = 0; special[i].lx_chr != 0; i++)
857 if (c == special[i].lx_chr)
858 return (last_lex = special[i].lx_val);
861 return (last_lex = LX_ERR);
864 if ((c = *cp++) == 0)
866 for (i = 0; special[i].lx_chr != 0; i++)
867 if (c == special[i].lx_chr)
869 if (iscntrl (c) || isspace (c))
879 last_lex = !gotat || cp == NULL || strchr(cp, '<') != NULL
886 legal_person (char *p)
890 static char buffer[BUFSIZ];
894 for (cp = p; *cp; cp++)
895 for (i = 0; special[i].lx_chr; i++)
896 if (*cp == special[i].lx_chr) {
897 sprintf (buffer, "\"%s\"", p);
906 mfgets (FILE *in, char **bp)
909 register char *cp, *dp, *ep;
911 static char *pp = NULL;
914 if (!(pp = malloc ((size_t) (len = BUFSIZ))))
917 for (ep = (cp = pp) + len - 2;;) {
918 switch (i = getc (in)) {
936 if (cp == pp) /* end of headers, gobble it */
938 switch (i = getc (in)) {
939 default: /* end of line */
940 case '\n': /* end of headers, save for next call */
944 case ' ': /* continue headers */
948 } /* fall into default case */
955 if (!(dp = realloc (pp, (size_t) (len += BUFSIZ)))) {
961 cp += dp - pp, ep = (pp = cp) + len - 2;