1 files changed, 46 insertions, 0 deletions
diff --git a/src/domain.c b/src/domain.c
index 2031726..13e4afa 100644
--- a/src/domain.c
+++ b/src/domain.c
@@ -481,6 +481,52 @@ bestmx_map_lookup(map, name, av, statp)
 		return map_rewrite(map, mxhosts[0], strlen(mxhosts[0]), av);
 }
 /*
+**  ISMX -- find if we are the MX for a certain host.
+**
+**	This is really a hack, but I don't see any obvious way
+**	to generalize it at the moment.
+*/
+
+char *
+ismx_map_lookup(map, name, av, statp)
+	MAP *map;
+	char *name;
+	char **av;
+	int *statp;
+{
+	int nmx, i, len;
+	auto int rcode;
+	int saveopts = _res.options;
+	char *mxhosts[MAXMXHOSTS + 1];
+	char *mymx = NULL;
+
+	_res.options &= ~(RES_DNSRCH|RES_DEFNAMES);
+	nmx = getmxrr(name, mxhosts, FALSE, &rcode);
+	_res.options = saveopts;
+	if (rcode != EX_TEMPFAIL) {
+		if (nmx <= 0)
+			return NULL;
+		for(i = 0; i < nmx; i++) {
+			len = strlen(mxhosts[i]);
+			if (len && mxhosts[i][len - 1] == '.')
+				mxhosts[i][len - 1] = 0;
+			if (wordinclass(mxhosts[i], 'w')) {
+				mymx = mxhosts[i];
+				break;
+			}
+		}
+		if (mymx == NULL)
+			return NULL;
+	} else
+		mymx = "TEMPFAIL";
+
+	if (bitset(MF_MATCHONLY, map->map_mflags))
+		return map_rewrite(map, name, strlen(name), NULL);
+	else
+		return map_rewrite(map, mymx, strlen(mymx), av);
+}
+
+/*
 **  DNS_GETCANONNAME -- get the canonical name for named host using DNS
 **
 **	This algorithm tries to be smart about wildcard MX records.