[Python-Dev] PATCH/RFC for AF_NETLINK support (original) (raw)

Philippe Biondi phil at secdev.org
Mon Jan 10 17:17:49 CET 2005

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Hi,

I've done a small patch to use linux AF_NETLINK sockets (see below). Please comment!

Is there a reason for recvmsg() and sendmsg() not to be implemented yet in socketmodule ?

The integration with autoconf has not been done, even if this patch should be ok :

--- configure.in.ori 2005-01-10 17:09:32.000000000 +0100 +++ configure.in 2005-01-06 18:53:18.000000000 +0100 @@ -967,7 +967,7 @@ sys/audioio.h sys/bsdtty.h sys/file.h sys/loadavg.h sys/lock.h sys/mkdev.h
sys/modem.h
sys/param.h sys/poll.h sys/select.h sys/socket.h sys/time.h sys/times.h
-sys/un.h sys/utsname.h sys/wait.h pty.h libutil.h
+sys/un.h linux/netlink.h sys/utsname.h sys/wait.h pty.h libutil.h
sys/resource.h netpacket/packet.h sysexits.h bluetooth.h
bluetooth/bluetooth.h) AC_HEADER_DIRENT --- pyconfig.h.ori 2005-01-10 17:11:11.000000000 +0100 +++ pyconfig.h 2005-01-06 19:27:33.000000000 +0100 @@ -559,6 +559,9 @@ /* Define to 1 if you have the <sys/un.h> header file. */ #define HAVE_SYS_UN_H 1

+/* Define to 1 if you have the <linux/netlink.h> header file. / +#define HAVE_LINUX_NETLINK_H 1 + / Define to 1 if you have the <sys/utsname.h> header file. */ #define HAVE_SYS_UTSNAME_H 1

--- socketmodule.h.ori 2005-01-07 19:25:18.000000000 +0100 +++ socketmodule.h 2005-01-06 18:20:54.000000000 +0100 @@ -32,6 +32,12 @@

undef AF_UNIX

#endif

+#ifdef HAVE_LINUX_NETLINK_H +# include <linux/netlink.h> +#else +# undef AF_NETLINK +#endif + #ifdef HAVE_BLUETOOTH_BLUETOOTH_H #include <bluetooth/bluetooth.h> #include <bluetooth/rfcomm.h> @@ -87,6 +93,9 @@ typedef struct { #ifdef AF_UNIX struct sockaddr_un un; #endif +#ifdef AF_NETLINK

•           struct sockaddr_nl nl;

+#endif #ifdef ENABLE_IPV6 struct sockaddr_in6 in6; struct sockaddr_storage storage; --- socketmodule.c.ori 2005-01-07 19:25:19.000000000 +0100 +++ socketmodule.c 2005-01-10 17:04:38.000000000 +0100 @@ -948,6 +948,14 @@ makesockaddr(int sockfd, struct sockaddr } #endif /* AF_UNIX */

+#if defined(AF_NETLINK)

•   case AF_NETLINK:

•   {

•           struct sockaddr_nl *a = (struct sockaddr_nl *) addr;

•           return Py_BuildValue("ii", a->nl_pid, a->nl_groups);

•   }

+#endif /* AF_NETLINK */ + #ifdef ENABLE_IPV6 case AF_INET6: { @@ -1084,6 +1092,31 @@ getsockaddrarg(PySocketSockObject s, Py } #endif / AF_UNIX */

+#if defined(AF_NETLINK)

•   case AF_NETLINK:

•   {

•           struct sockaddr_nl* addr;

•           int pid, groups;

•           addr = (struct sockaddr_nl *)&(s->sock_addr).nl;

•           if (!PyTuple_Check(args)) {

•                   PyErr_Format(

•                           PyExc_TypeError,

•                           "getsockaddrarg: "

•                           "AF_NETLINK address must be tuple, not %.500s",

•                           args->ob_type->tp_name);

•                   return 0;

•           }

•           if (!PyArg_ParseTuple(args, "II", &pid, &groups))

•                   return 0;

•           addr->nl_family = AF_NETLINK;

•           addr->nl_pid = pid;

•           addr->nl_groups = groups;

•           *addr_ret = (struct sockaddr *) addr;

•           *len_ret = sizeof(*addr);

•           return 1;

•   }

+#endif + case AF_INET: { struct sockaddr_in* addr; @@ -1280,6 +1313,13 @@ getsockaddrlen(PySocketSockObject s, so return 1; } #endif / AF_UNIX */ +#if defined(AF_NETLINK)

•   case AF_NETLINK:

•   {

•           *len_ret = sizeof (struct sockaddr_nl);

•           return 1;

•   }

+#endif

    case AF_INET:
    {

@@ -3938,8 +3978,20 @@ init_socket(void) PyModule_AddIntConstant(m, "AF_KEY", AF_KEY); #endif #ifdef AF_NETLINK

•   /*  */

•   /* Netlink socket */
    PyModule_AddIntConstant(m, "AF_NETLINK", AF_NETLINK);

•   PyModule_AddIntConstant(m, "NETLINK_ROUTE", NETLINK_ROUTE);

•   PyModule_AddIntConstant(m, "NETLINK_SKIP", NETLINK_SKIP);

•   PyModule_AddIntConstant(m, "NETLINK_USERSOCK", NETLINK_USERSOCK);

•   PyModule_AddIntConstant(m, "NETLINK_FIREWALL", NETLINK_FIREWALL);

•   PyModule_AddIntConstant(m, "NETLINK_TCPDIAG", NETLINK_TCPDIAG);

•   PyModule_AddIntConstant(m, "NETLINK_NFLOG", NETLINK_NFLOG);

•   PyModule_AddIntConstant(m, "NETLINK_XFRM", NETLINK_XFRM);

•   PyModule_AddIntConstant(m, "NETLINK_ARPD", NETLINK_ARPD);

•   PyModule_AddIntConstant(m, "NETLINK_ROUTE6", NETLINK_ROUTE6);

•   PyModule_AddIntConstant(m, "NETLINK_IP6_FW", NETLINK_IP6_FW);

•   PyModule_AddIntConstant(m, "NETLINK_DNRTMSG", NETLINK_DNRTMSG);

•   PyModule_AddIntConstant(m, "NETLINK_TAPBASE", NETLINK_TAPBASE);

#endif #ifdef AF_ROUTE /* Alias to emulate 4.4BSD */

-- Philippe Biondi <phil@ secdev.org> SecDev.org Security Consultant/R&D http://www.secdev.org PGP KeyID:3D9A43E2 FingerPrint:C40A772533730E39330DC0985EE8FF5F3D9A43E2

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