1 files changed, 94 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/roken/getnameinfo_verified.c b/third_party/heimdal/lib/roken/getnameinfo_verified.c
new file mode 100644
index 0000000..6175291
--- /dev/null
+++ b/third_party/heimdal/lib/roken/getnameinfo_verified.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 1999 - 2002 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include "roken.h"
+
+/*
+ * Try to obtain a verified name for the address in `sa, salen' (much
+ * similar to getnameinfo).
+ * Verified in this context means that forwards and backwards lookups
+ * in DNS are consistent.  If that fails, return an error if the
+ * NI_NAMEREQD flag is set or return the numeric address as a string.
+ */
+
+ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
+getnameinfo_verified(const struct sockaddr *sa, socklen_t salen,
+		     char *host, size_t hostlen,
+		     char *serv, size_t servlen,
+		     int flags)
+{
+    int ret;
+    struct addrinfo *ai, *a;
+    char servbuf[NI_MAXSERV];
+    struct addrinfo hints;
+    void *saaddr;
+    size_t sasize;
+
+    if (host == NULL)
+	return EAI_NONAME;
+
+    if (serv == NULL) {
+	serv = servbuf;
+	servlen = sizeof(servbuf);
+    }
+
+    ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
+		       flags | NI_NUMERICSERV);
+    if (ret)
+	goto fail;
+
+    memset (&hints, 0, sizeof(hints));
+    hints.ai_socktype = SOCK_STREAM;
+    ret = getaddrinfo (host, serv, &hints, &ai);
+    if (ret)
+	goto fail;
+
+    saaddr = socket_get_address(sa);
+    sasize = socket_addr_size(sa);
+    for (a = ai; a != NULL; a = a->ai_next) {
+	if (sasize == socket_addr_size(a->ai_addr) &&
+	    memcmp(saaddr, socket_get_address(a->ai_addr), sasize) == 0) {
+	    freeaddrinfo (ai);
+	    return 0;
+	}
+    }
+    freeaddrinfo (ai);
+ fail:
+    if (flags & NI_NAMEREQD)
+	return EAI_NONAME;
+    ret = getnameinfo (sa, salen, host, hostlen, serv, servlen,
+		       flags | NI_NUMERICSERV | NI_NUMERICHOST);
+    return ret;
+}