SECURITY: Do not hang, eating CPU, if we encounter a compression pointer loop

[adns.git] / src / addrfam.c

diff --git a/src/addrfam.c b/src/addrfam.c
index 00e5b1a6b82b1cea93d9ebb6928cb66a42d0846b..0ba204920529b980927374a75feca4bae51b389a 100644 (file)
--- a/src/addrfam.c
+++ b/src/addrfam.c
@@ -4,7 +4,8 @@
  */
 /*
  *  This file is part of adns, which is
- *    Copyright (C) 1997-2000,2003,2006  Ian Jackson
+ *    Copyright (C) 1997-2000,2003,2006,2014-2016  Ian Jackson
+ *    Copyright (C) 2014  Mark Wooding
  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  *    Copyright (C) 1991 Massachusetts Institute of Technology
  *  (See the file INSTALL for full details.)
@@ -255,9 +256,18 @@ static bool addrtext_scope_use_ifname(const struct sockaddr *sa) {
     IN6_IS_ADDR_MC_LINKLOCAL(in6);
 }
 
+static int textaddr_check_qf(adns_queryflags flags) {
+  if (flags & ~(adns_queryflags)(adns_qf_addrlit_scope_forbid|
+                                adns_qf_addrlit_scope_numeric|
+                                adns_qf_addrlit_ipv4_quadonly|
+                                0x40000000))
+    return ENOSYS;
+  return 0;
+}
+
 int adns_text2addr(const char *text, uint16_t port, adns_queryflags flags,
                   struct sockaddr *sa, socklen_t *salen_io) {
-  int af;
+  int r, af;
   char copybuf[INET6_ADDRSTRLEN];
   const char *parse=text;
   const char *scopestr=0;
@@ -265,6 +275,8 @@ int adns_text2addr(const char *text, uint16_t port, adns_queryflags flags,
   void *dst;
   uint16_t *portp;
 
+  r= textaddr_check_qf(flags);  if (r) return r;
+
 #define INVAL(how) do{                         \
   af_debug("invalid: %s: `%s'", how, text);    \
   return EINVAL;                               \
@@ -388,7 +400,9 @@ int adns_text2addr(const char *text, uint16_t port, adns_queryflags flags,
 int adns_addr2text(const struct sockaddr *sa, adns_queryflags flags,
                   char *buffer, int *buflen_io, int *port_r) {
   const void *src;
-  int port;
+  int r, port;
+
+  r= textaddr_check_qf(flags);  if (r) return r;
 
   if (*buflen_io < ADNS_ADDR2TEXT_BUFLEN) {
     *buflen_io = ADNS_ADDR2TEXT_BUFLEN;