New submission from Niall O'Higgins <[EMAIL PROTECTED]>: socket.setsockopt() sets an optlen of '4' in the setsockopt system call for options IP_MULTICAST_TTL and IP_MULTICAST_LOOP. On OpenBSD, this causes the kernel to hit an error condition and set errno 22 when these options are set:
socket.error: (22, 'Invalid argument') Yielded by e.g. socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 1) According to both FreeBSD and OpenBSD manual pages (see e.g. http://www.freebsd.org/cgi/man.cgi?query=ip&apropos=0&sektion=0&manpath=FreeBSD+7.0-RELEASE&format=html), these fields are in fact both 8 bit unsigned, and the manuals suggest the following: u_char ttl; /* range: 0 to 255, default = 1 */ setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); While '4' (sizeof int) is correct for many options, special casing is needed in Modules/socketmodule.c. The following diff fixes the issue for me on OpenBSD: @@ -1716,12 +1719,8 @@ sock_setsockopt(PySocketSockObject *s, PyObject *args) if (PyArg_ParseTuple(args, "iii:setsockopt", &level, &optname, &flag)) { - buflen = sizeof flag; - /* Multi cast options take shorter arguments */ - if (optname == IP_MULTICAST_TTL - || optname == IP_MULTICAST_LOOP) - buflen = sizeof(u_char); buf = (char *) &flag; + buflen = sizeof flag; } else { PyErr_Clear(); ---------- components: Library (Lib) messages: 69741 nosy: niallo severity: normal status: open title: socket.setsockopt() is broken for multicast TTL and Loop options type: behavior versions: Python 2.5 _______________________________________ Python tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue3372> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
