some first thoughts at a MAILB lookup

SCCS-vsn: usr.sbin/sendmail/src/domain.c 6.19.1.1

diff --git a/usr/src/usr.sbin/sendmail/src/domain.c b/usr/src/usr.sbin/sendmail/src/domain.c
index f55f608..6831419 100644 (file)
--- a/usr/src/usr.sbin/sendmail/src/domain.c
+++ b/usr/src/usr.sbin/sendmail/src/domain.c
@@ -10,9 +10,9 @@
 
 #ifndef lint
 #ifdef NAMED_BIND
 
 #ifndef lint
 #ifdef NAMED_BIND

-static char sccsid[] = "@(#)domain.c   6.19 (Berkeley) %G% (with name server)";
+static char sccsid[] = "@(#)domain.c   6.19.1.1 (Berkeley) %G% (with name server)";

 #else
 #else

-static char sccsid[] = "@(#)domain.c   6.19 (Berkeley) %G% (without name server)";
+static char sccsid[] = "@(#)domain.c   6.19.1.1 (Berkeley) %G% (without name server)";

 #endif
 #endif /* not lint */
 
 #endif
 #endif /* not lint */
 


@@ -550,6 +550,130 @@ cnameloop:
        host[hbsize - 1] = '\0';
        return TRUE;
 }
        host[hbsize - 1] = '\0';
        return TRUE;
 }

+\f/*
+**  MAILB_LOOKUP -- do DNS mailbox lookup
+*/
+
+#ifdef DNS_MAILB
+
+mailb_lookup(addr)
+       char *addr;
+{
+       /*
+       **  Convert addr to DNS form (user.host).
+       */
+
+       /* figure out how much space it needs */
+       atp = strchr(addr, '@');
+       if (atp == NULL)
+               atp = &addr(strlen(addr));
+       i = strlen(addr);
+       for (p = addr; (p = strchr(p, '.')) != NULL; p++)
+       {
+               if (p > atp)
+                       break;
+               i++;
+       }
+       if (i < sizeof abuf)
+               bufp = abuf;
+       else
+               bufp = xalloc(i + 1);
+
+       lhsmode = TRUE;
+       for (p = addr, q = bufp; (c = *p++) != '\0'; )
+       {
+               if (c == '.' && lhsmode)
+                       *q++ = '\\';
+               if (c == '@')
+                       lhsmode = FALSE;
+               *q++ = c;
+       }
+       *q = '\0';
+
+       /*
+       **  Now do a MAILB lookup.
+       */
+
+retry:
+       if (res_query(bufp, C_IN, T_MAILB, (char *) &answer, sizeof answer < 0)
+       {
+               /* no match -- just continue as usual */
+               return FALSE;
+       }
+
+       /* find first satisfactory answer */
+       hp = (HEADER *)&answer;
+       ap = (u_char *)&answer + sizeof(HEADER);
+       eom = (u_char *)&answer + n;
+       for (qdcount = ntohs(hp->qdcount); qdcount--; ap += n + QFIXEDSZ)
+               if ((n = dn_skipname(ap, eom)) < 0)
+                       return FALSE;
+       for (ancount = ntohs(hp->ancount); --ancount >= 0 && ap < eom; ap += n)
+       {
+               n = dn_expand((u_char *)&answer, eom, ap, (u_char *)bp, buflen);
+               if (n < 0)
+                       break;
+               ap += n;
+               GETSHORT(type, ap);
+               ap += SHORTSIZE + LONGSIZE;
+               GETSHORT(n, ap);
+               switch (type)
+               {
+                 case T_MR:
+                       /* rename: try again */
+                       i = dn_expand((u_char *) &answer, eom, ap,
+                                       (u_char) abuf, sizeof abuf);
+                       if (i < 0)
+                               break;
+                       if (bufp != abuf)
+                       {
+                               free(bufp);
+                               bufp = abuf;
+                       }
+                       goto retry;
+
+                 case T_MB:
+                       i = dn_expand((u_char *) &answer, eom, ap,
+                                       (u_char) hbuf, sizeof hbuf);
+                       if (i < 0)
+                               break;
+
+                       /* hbuf now has the host to deliver to */
+                       break;
+
+                 case T_MG:
+                       i = dn_expand((u_char *) &answer, eom, ap,
+                                       (u_char) gbuf, sizeof gbuf);
+                       if (i < 0)
+                               break;
+                       AliasLevel++;
+                       naddrs += sendtolist(ubuf, a, sendq, e);
+                       AliasLevel--;
+                       break;
+
+                 case T_MINFO:
+                       /* bleach */
+                       XXX;
+               }
+
+
+
+               if (type != T_MX)
+               {
+                       if (tTd(8, 8) || _res.options & RES_DEBUG)
+                               printf("unexpected answer type %d, size %d\n",
+                                   type, n);
+                       cp += n;
+                       continue;
+               }
+               GETSHORT(pref, cp);
+               if ((n = dn_expand((u_char *)&answer, eom, cp,
+                                  (u_char *)bp, buflen)) < 0)
+                       break;
+               cp += n;
+
+
+#endif /* DNS_MAILB */

 
 #else /* not NAMED_BIND */
 
 
 #else /* not NAMED_BIND */