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libcody: Do not use a dummy port number in getaddrinfo().

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the getaddrinfo() requires either a non-null name for the server or
a port service / number.  In the code that opens a connection we have
been calling this with a dummy port number of "0".  Unfortunately this
triggers a bug in some BSD versions and OSes importing that code.

In this part of the code we do not really need a port number, since it
is not reasonable to open a connection to an unspecified host.

Setting hints info field to 0, and the servname parm to nullptr works
around the BSD bug in this case.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

libcody/ChangeLog:

	* netclient.cc (OpenInet6): Do not provide a dummy port number
	in the getaddrinfo() call.
This commit is contained in:
Iain Sandoe 2022-03-13 16:29:45 +00:00
parent 356e2720e9
commit 99fcd602a8
1 changed files with 2 additions and 4 deletions
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6
libcody/netclient.cc
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@ -93,7 +93,7 @@ int OpenInet6 (char const **e, char const *name, int port)
}
addrinfo hints;
hints.ai_flags = AI_NUMERICSERV;
hints.ai_flags = 0;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
@ -102,9 +102,7 @@ int OpenInet6 (char const **e, char const *name, int port)
hints.ai_canonname = nullptr;
hints.ai_next = nullptr;
/* getaddrinfo requires a port number, but is quite happy to accept
invalid ones. So don't rely on it. */
if (int err = getaddrinfo (name, "0", &hints, &addrs))
if (int err = getaddrinfo (name, nullptr, &hints, &addrs))
{
errstr = gai_strerror (err);
// What's the best errno to set?