Nmap Development mailing list archives
[PATCH] ncat proxy client fixes
From: Joachim Henke <free.software () gmx com>
Date: Fri, 29 Mar 2013 19:05:03 +0100
Hi, connecting to a proxy via IPv6 and trying to reach an IPv4 target does not work: ~$ ncat --proxy ::1:8080 127.0.0.1 80 Ncat: Proxy connection failed: Invalid argument. With strace, we can see that the address_len argument is wrong: connect(3, {sa_family=AF_INET6, sin6_port=htons(8080), inet_pton(AF_INET6, "::", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 16) = -1 EINVAL (Invalid argument) 16 is too short (that would be just be enough for the address itself without port and other information...) and therefore the address is cut to "::". That happens because, while coping the sockaddr structs around, the length information of the structs is not copied. The attached patch 'ncat_proxy_addrlen.diff' fixes this issue. Additionally, I found that the URL in the CONNECT command looks wrong for IPv6 addresses: CONNECT [::1]:80] HTTP/1.0 I think that should be fixed with the attached patch 'ncat_proxy_url.diff'. Thanks and regards, Joachim Henke
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ncat_proxy_addrlen.diff.gz
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ncat_proxy_url.diff.gz
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- [PATCH] ncat proxy client fixes Joachim Henke (Mar 29)