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Reject non-useable routes. Fixes #2206

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nnposter
2021-01-18 20:11:40 +00:00
parent 5258ac6b3c
commit 4564749ccd
2 changed files with 6 additions and 1 deletions
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4
CHANGELOG
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@@ -1,5 +1,9 @@
#Nmap Changelog ($Id$); -*-text-*-
o [GH#2206] Nmap no longer produces cryptic message "Failed to convert
source address to presentation format" when unable to find useable route
to the target. [nnposter]
o [Ncat][GH#2202] Use safety-checked versions of FD_* macros to abort early if
number of connections exceeds FD_SETSIZE. [Pavel Zhukov]

3
libnetutil/netutil.cc
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@@ -3163,7 +3163,8 @@ static int route_dst_netlink(const struct sockaddr_storage *dst,
len -= NLMSG_LENGTH(sizeof(*nlmsg));
/* See rtnetlink(7). Anything matching this route is actually unroutable. */
if (rtmsg->rtm_type == RTN_UNREACHABLE)
if (rtmsg->rtm_type == RTN_UNREACHABLE || rtmsg->rtm_type == RTN_UNSPEC
|| rtmsg->rtm_type == RTN_BLACKHOLE || rtmsg->rtm_type == RTN_PROHIBIT)
return 0;
/* Default values to be possibly overridden. */