all: import netsniff-ng 0.5.8-rc0 source

We decided to get rid of the old Git history and start a new one for
several reasons:

 *) Allow / enforce only high-quality commits (which was not the case
    for many commits in the history), have a policy that is more close
    to the one from the Linux kernel. With high quality commits, we
    mean code that is logically split into commits and commit messages
    that are signed-off and have a proper subject and message body.
    We do not allow automatic Github merges anymore, since they are
    total bullshit. However, we will either cherry-pick your patches
    or pull them manually.

 *) The old archive was about ~27MB for no particular good reason.
    This basically derived from the bad decision that also some PDF
    files where stored there. From this moment onwards, no binary
    objects are allowed to be stored in this repository anymore.

The old archive is not wiped away from the Internet. You will still
be able to find it, e.g. on git.cryptoism.org etc.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 223 insertions, 0 deletions

diff --git a/mac80211.c b/mac80211.c
new file mode 100644
index 0000000..14bcc93
--- /dev/null
+++ b/mac80211.c
@@ -0,0 +1,223 @@
+/*
+ * netsniff-ng - the packet sniffing beast
+ * Copyright 2012 Daniel Borkmann.
+ * Subject to the GPL, version 2.
+ * Parts derived from iw, subject to ISC license.
+ * Copyright 2007, 2008	Johannes Berg
+ * Copyright 2007 Andy Lutomirski
+ * Copyright 2007 Mike Kershaw
+ * Copyright 2008-2009 Luis R. Rodriguez
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <limits.h>
+#include <linux/nl80211.h>
+#include <libnl3/netlink/genl/genl.h>
+#include <libnl3/netlink/genl/family.h>
+#include <libnl3/netlink/genl/ctrl.h>
+#include <libnl3/netlink/msg.h>
+#include <libnl3/netlink/attr.h>
+
+#include "die.h"
+#include "xutils.h"
+#include "mac80211.h"
+#include "xmalloc.h"
+#include "built_in.h"
+
+struct nl80211_state {
+	struct nl_sock *nl_sock;
+	struct nl_cache *nl_cache;
+	struct genl_family *nl80211;
+};
+
+static void get_mac80211_phydev(const char *device, char *phydev_path,
+				size_t phydev_len)
+{
+	int ret;
+	char *pathstr;
+	ssize_t num;
+
+	ret = asprintf(&pathstr, "/sys/class/net/%s/phy80211", device);
+	if (ret < 0)
+		panic("Can't generate path name string for /sys/class/net device");
+
+	num = readlink(pathstr, phydev_path, phydev_len);
+	if (num < 0) {
+		if (errno == ENOENT || errno == EINVAL)
+			panic("It's probably not a mac80211 device!\n");
+		panic("Can't readlink %s: %s!\n", pathstr, strerror(errno));
+	}
+
+	xfree(pathstr);
+	phydev_path[min(num, phydev_len - 1)] = 0;
+}
+
+static inline struct nl_msg *nl80211_nlmsg_xalloc(void)
+{
+	struct nl_msg *ret = nlmsg_alloc();
+	if (!ret)
+		panic("Cannot allocate nlmsg memory!\n");
+	return ret;
+}
+
+static inline struct nl_sock *nl80211_nl_socket_xalloc(void)
+{
+	struct nl_sock *ret = nl_socket_alloc();
+	if (!ret)
+		panic("Cannot allocate nl socket memory!\n");
+	return ret;
+}
+
+static void nl80211_init(struct nl80211_state *state, const char *device)
+{
+	int ret;
+
+	state->nl_sock = nl80211_nl_socket_xalloc();
+
+	ret = genl_connect(state->nl_sock);
+	if (ret)
+		panic("Cannot connect generic netlink!\n");
+
+	ret = genl_ctrl_alloc_cache(state->nl_sock, &state->nl_cache);
+	if (ret < 0)
+		panic("Failed to allocate generic netlink cache: %s!",
+		      nl_geterror(-ret));
+
+	state->nl80211 = genl_ctrl_search_by_name(state->nl_cache, "nl80211");
+	if (!state->nl80211)
+		panic("nl80211 not found in netlink cache!\n");
+}
+
+static void nl80211_cleanup(struct nl80211_state *state)
+{
+	genl_family_put(state->nl80211);
+
+	nl_cache_free(state->nl_cache);
+	nl_socket_free(state->nl_sock);
+}
+
+static int nl80211_add_mon_if(struct nl80211_state *state, const char *device,
+			      const char *mondevice)
+{
+	int ifindex, ret;
+	struct nl_msg *msg;
+
+	ifindex = device_ifindex(device);
+
+	msg = nl80211_nlmsg_xalloc();
+
+	genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0,
+		    0, NL80211_CMD_NEW_INTERFACE, 0);
+
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
+	NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, mondevice);
+	NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MONITOR);
+
+	ret = nl_send_auto_complete(state->nl_sock, msg);
+	if (ret < 0) {
+		if (ret == -ENFILE) {
+			nlmsg_free(msg);
+			return -EBUSY;
+		}
+
+		panic("Cannot send_auto_complete!\n");
+	}
+
+	ret = nl_wait_for_ack(state->nl_sock);
+	if (ret < 0) {
+		if (ret == -ENFILE) {
+			nlmsg_free(msg);
+			return -EBUSY;
+		}
+
+		panic("Waiting for netlink ack failed!\n");
+	}
+
+	nlmsg_free(msg);
+	return 0;
+
+nla_put_failure:
+	panic("nla put failure!\n");
+	return -EIO; /* dummy */
+}
+
+static int nl80211_del_mon_if(struct nl80211_state *state, const char *device,
+			      const char *mondevice)
+{
+	int ifindex, ret;
+	struct nl_msg *msg;
+
+	ifindex = device_ifindex(mondevice);
+
+	msg = nl80211_nlmsg_xalloc();
+
+	genlmsg_put(msg, 0, 0, genl_family_get_id(state->nl80211), 0,
+		    0, NL80211_CMD_DEL_INTERFACE, 0);
+
+	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
+
+	ret = nl_send_auto_complete(state->nl_sock, msg);
+	if (ret < 0)
+		panic("Cannot send_auto_complete!\n");
+
+	ret = nl_wait_for_ack(state->nl_sock);
+	if (ret < 0)
+		panic("Waiting for netlink ack failed!\n");
+
+	nlmsg_free(msg);
+	return 0;
+
+nla_put_failure:
+	panic("nla put failure!\n");
+	return -EIO; /* dummy */
+}
+
+void enter_rfmon_mac80211(const char *device, char **mondev)
+{
+	int ret;
+	short flags;
+	uint32_t n;
+	char phydev_path[256];
+	struct nl80211_state nlstate;
+
+	/* XXX: is this already a monN device? */
+	get_mac80211_phydev(device, phydev_path, sizeof(phydev_path));
+	nl80211_init(&nlstate, device);
+
+	for (n = 0; n < UINT_MAX; n++) {
+		char mondevice[32];
+
+		slprintf(mondevice, sizeof(mondevice), "mon%u", n);
+		ret = nl80211_add_mon_if(&nlstate, device, mondevice);
+		if (ret == 0) {
+			*mondev = xstrdup(mondevice);
+
+			flags = device_get_flags(*mondev);
+			flags |= IFF_UP | IFF_RUNNING;
+			device_set_flags(*mondev, flags);
+
+			nl80211_cleanup(&nlstate);
+			return;
+		}
+	}
+
+	panic("No free monN interfaces!\n");
+}
+
+void leave_rfmon_mac80211(const char *device, const char *mondev)
+{
+	short flags;
+	struct nl80211_state nlstate;
+
+	flags = device_get_flags(mondev);
+	flags &= ~(IFF_UP | IFF_RUNNING);
+	device_set_flags(mondev, flags);
+
+	nl80211_init(&nlstate, device);
+	nl80211_del_mon_if(&nlstate, device, mondev);
+	nl80211_cleanup(&nlstate);
+}