python/examples/iface.py

from __future__ import print_function
import netlink.capi as nl
import netlink.genl.capi as genl
import nl80211
import sys
import traceback


class test_class:
    def __init__(self):
        self.done = 1


def msg_handler(m, a):
    try:
        e, attr = genl.py_genlmsg_parse(
            nl.nlmsg_hdr(m), 0, nl80211.NL80211_ATTR_MAX, None
        )
        if nl80211.NL80211_ATTR_WIPHY in attr:
            thiswiphy = nl.nla_get_u32(attr[nl80211.NL80211_ATTR_WIPHY])
            print("phy#%d" % thiswiphy)
        if nl80211.NL80211_ATTR_IFNAME in attr:
            print(
                "\tinterface %s" % nl.nla_get_string(attr[nl80211.NL80211_ATTR_IFNAME])
            )
        if nl80211.NL80211_ATTR_IFINDEX in attr:
            print("\tifindex %d" % nl.nla_get_u32(attr[nl80211.NL80211_ATTR_IFINDEX]))
        if nl80211.NL80211_ATTR_WDEV in attr:
            print("\twdev 0x%lx" % nl.nla_get_u64(attr[nl80211.NL80211_ATTR_WDEV]))
        if nl80211.NL80211_ATTR_MAC in attr:
            print(
                "\tmac %02x:%02x:%02x:%02x:%02x:%02x"
                % tuple(nl.nla_data(attr[nl80211.NL80211_ATTR_MAC]))
            )
        if nl80211.NL80211_ATTR_SSID in attr:
            print("\tssid ", nl.nla_data(attr[nl80211.NL80211_ATTR_SSID]))
        if nl80211.NL80211_ATTR_IFTYPE in attr:
            iftype = nl.nla_get_u32(attr[nl80211.NL80211_ATTR_IFTYPE])
            print("\ttype %s" % nl80211.nl80211_iftype2str[iftype])
        if nl80211.NL80211_ATTR_WIPHY_FREQ in attr:
            freq = nl.nla_get_u32(attr[nl80211.NL80211_ATTR_WIPHY_FREQ])

            sys.stdout.write("\tfreq %d MHz" % freq)

            if nl80211.NL80211_ATTR_CHANNEL_WIDTH in attr:
                chanw = nl.nla_get_u32(attr[nl80211.NL80211_ATTR_CHANNEL_WIDTH])
                sys.stdout.write(", width: %s" % nl80211.nl80211_chan_width2str[chanw])
                if nl80211.NL80211_ATTR_CENTER_FREQ1 in attr:
                    sys.stdout.write(
                        ", center1: %d MHz"
                        % nl.nla_get_u32(attr[nl80211.NL80211_ATTR_CENTER_FREQ1])
                    )
                if nl80211.NL80211_ATTR_CENTER_FREQ2 in attr:
                    sys.stdout.write(
                        ", center2: %d MHz"
                        % nl.nla_get_u32(attr[nl80211.NL80211_ATTR_CENTER_FREQ2])
                    )
            elif nl80211.NL80211_ATTR_WIPHY_CHANNEL_TYPE in attr:
                channel_type = nl.nla_get_u32(
                    attr[nl80211.NL80211_ATTR_WIPHY_CHANNEL_TYPE]
                )
                sys.stdout.write(" %s" % nl80211.nl80211_channel_type2str(channel_type))

            sys.stdout.write("\n")
        return nl.NL_SKIP
    except Exception:
        (t, v, tb) = sys.exc_info()
        print(v.message)
        traceback.print_tb(tb)


def error_handler(err, a):
    a.done = err.error
    return nl.NL_STOP


def finish_handler(m, a):
    return nl.NL_SKIP


def ack_handler(m, a):
    a.done = 0
    return nl.NL_STOP


try:
    cbd = test_class()
    tx_cb = nl.nl_cb_alloc(nl.NL_CB_DEFAULT)
    rx_cb = nl.nl_cb_clone(tx_cb)
    s = nl.nl_socket_alloc_cb(tx_cb)
    nl.py_nl_cb_err(rx_cb, nl.NL_CB_CUSTOM, error_handler, cbd)
    nl.py_nl_cb_set(rx_cb, nl.NL_CB_FINISH, nl.NL_CB_CUSTOM, finish_handler, cbd)
    nl.py_nl_cb_set(rx_cb, nl.NL_CB_ACK, nl.NL_CB_CUSTOM, ack_handler, cbd)
    nl.py_nl_cb_set(rx_cb, nl.NL_CB_VALID, nl.NL_CB_CUSTOM, msg_handler, cbd)

    genl.genl_connect(s)
    family = genl.genl_ctrl_resolve(s, "nl80211")
    m = nl.nlmsg_alloc()
    genl.genlmsg_put(m, 0, 0, family, 0, 0, nl80211.NL80211_CMD_GET_INTERFACE, 0)
    nl.nla_put_u32(m, nl80211.NL80211_ATTR_IFINDEX, nl.if_nametoindex("wlan0"))

    err = nl.nl_send_auto_complete(s, m)
    if err < 0:
        nl.nlmsg_free(m)

    while cbd.done > 0 and not err < 0:
        err = nl.nl_recvmsgs(s, rx_cb)

except Exception:
    (t, v, tb) = sys.exc_info()
    print(v.message)
    traceback.print_tb(tb)