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#include <stdint.h>
#include <stdbool.h>
#include <net/if.h>
#include <errno.h>
#include "iw.h"
static int no_seq_check(struct nl_msg *msg, void *arg)
{
return NL_OK;
}
struct ieee80211_beacon_channel {
__u16 center_freq;
bool passive_scan;
bool no_ibss;
};
static int parse_beacon_hint_chan(struct nlattr *tb,
struct ieee80211_beacon_channel *chan)
{
struct nlattr *tb_freq[NL80211_FREQUENCY_ATTR_MAX + 1];
static struct nla_policy beacon_freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
[NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
[NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
};
if (nla_parse_nested(tb_freq,
NL80211_FREQUENCY_ATTR_MAX,
tb,
beacon_freq_policy))
return -EINVAL;
chan->center_freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
if (tb_freq[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN])
chan->passive_scan = true;
if (tb_freq[NL80211_FREQUENCY_ATTR_NO_IBSS])
chan->no_ibss = true;
return 0;
}
static void print_frame(struct print_event_args *args, struct nlattr *attr)
{
uint8_t *frame;
size_t len;
int i;
char macbuf[6*3];
uint16_t tmp;
if (!attr)
printf(" [no frame]");
frame = nla_data(attr);
len = nla_len(attr);
if (len < 26) {
printf(" [invalid frame: ");
goto print_frame;
}
mac_addr_n2a(macbuf, frame + 10);
printf(" %s -> ", macbuf);
mac_addr_n2a(macbuf, frame + 4);
printf("%s", macbuf);
switch (frame[0] & 0xfc) {
case 0x10: /* assoc resp */
case 0x30: /* reassoc resp */
/* status */
tmp = (frame[27] << 8) + frame[26];
printf(" status: %d: %s", tmp, get_status_str(tmp));
break;
case 0x00: /* assoc req */
case 0x20: /* reassoc req */
break;
case 0xb0: /* auth */
/* status */
tmp = (frame[29] << 8) + frame[28];
printf(" status: %d: %s", tmp, get_status_str(tmp));
break;
break;
case 0xa0: /* disassoc */
case 0xc0: /* deauth */
/* reason */
tmp = (frame[25] << 8) + frame[24];
printf(" reason %d: %s", tmp, get_reason_str(tmp));
break;
}
if (!args->frame)
return;
printf(" [frame:");
print_frame:
for (i = 0; i < len; i++)
printf(" %.02x", frame[i]);
printf("]");
}
static int print_event(struct nl_msg *msg, void *arg)
{
#define PARSE_BEACON_CHAN(_attr, _chan) do { \
r = parse_beacon_hint_chan(tb[_attr], \
&_chan); \
if (r) \
return NL_SKIP; \
} while (0)
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *tb[NL80211_ATTR_MAX + 1], *nst;
struct print_event_args *args = arg;
char ifname[100];
char macbuf[6*3];
__u8 reg_type;
struct ieee80211_beacon_channel chan_before_beacon, chan_after_beacon;
__u32 wiphy_idx = 0;
int r;
int rem_nst;
__u16 status;
if (args->time) {
struct timeval tv;
gettimeofday(&tv, NULL);
printf("%ld.%06u: ", (long) tv.tv_sec, (unsigned int) tv.tv_usec);
}
nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (tb[NL80211_ATTR_IFINDEX] && tb[NL80211_ATTR_WIPHY]) {
if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), ifname);
printf("%s (phy #%d): ", ifname, nla_get_u32(tb[NL80211_ATTR_WIPHY]));
} else if (tb[NL80211_ATTR_IFINDEX]) {
if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), ifname);
printf("%s: ", ifname);
} else if (tb[NL80211_ATTR_WIPHY]) {
printf("phy #%d: ", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
}
switch (gnlh->cmd) {
case NL80211_CMD_NEW_WIPHY:
printf("renamed to %s\n", nla_get_string(tb[NL80211_ATTR_WIPHY_NAME]));
break;
case NL80211_CMD_TRIGGER_SCAN:
printf("scan started\n");
break;
case NL80211_CMD_NEW_SCAN_RESULTS:
printf("scan finished:");
case NL80211_CMD_SCAN_ABORTED:
if (gnlh->cmd == NL80211_CMD_SCAN_ABORTED)
printf("scan aborted:");
if (tb[NL80211_ATTR_SCAN_FREQUENCIES]) {
nla_for_each_nested(nst, tb[NL80211_ATTR_SCAN_FREQUENCIES], rem_nst)
printf(" %d", nla_get_u32(nst));
printf(",");
}
if (tb[NL80211_ATTR_SCAN_SSIDS]) {
nla_for_each_nested(nst, tb[NL80211_ATTR_SCAN_SSIDS], rem_nst) {
printf(" \"");
print_ssid_escaped(nla_len(nst), nla_data(nst));
printf("\"");
}
}
printf("\n");
break;
case NL80211_CMD_REG_CHANGE:
printf("regulatory domain change: ");
reg_type = nla_get_u8(tb[NL80211_ATTR_REG_TYPE]);
switch (reg_type) {
case NL80211_REGDOM_TYPE_COUNTRY:
printf("set to %s by %s request",
nla_get_string(tb[NL80211_ATTR_REG_ALPHA2]),
reg_initiator_to_string(nla_get_u8(tb[NL80211_ATTR_REG_INITIATOR])));
if (tb[NL80211_ATTR_WIPHY])
printf(" on phy%d", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
break;
case NL80211_REGDOM_TYPE_WORLD:
printf("set to world roaming by %s request",
reg_initiator_to_string(nla_get_u8(tb[NL80211_ATTR_REG_INITIATOR])));
break;
case NL80211_REGDOM_TYPE_CUSTOM_WORLD:
printf("custom world roaming rules in place on phy%d by %s request",
nla_get_u32(tb[NL80211_ATTR_WIPHY]),
reg_initiator_to_string(nla_get_u32(tb[NL80211_ATTR_REG_INITIATOR])));
break;
case NL80211_REGDOM_TYPE_INTERSECTION:
printf("intersection used due to a request made by %s",
reg_initiator_to_string(nla_get_u32(tb[NL80211_ATTR_REG_INITIATOR])));
if (tb[NL80211_ATTR_WIPHY])
printf(" on phy%d", nla_get_u32(tb[NL80211_ATTR_WIPHY]));
break;
default:
printf("unknown source (upgrade this utility)");
break;
}
printf("\n");
break;
case NL80211_CMD_REG_BEACON_HINT:
wiphy_idx = nla_get_u32(tb[NL80211_ATTR_WIPHY]);
memset(&chan_before_beacon, 0, sizeof(chan_before_beacon));
memset(&chan_after_beacon, 0, sizeof(chan_after_beacon));
PARSE_BEACON_CHAN(NL80211_ATTR_FREQ_BEFORE, chan_before_beacon);
PARSE_BEACON_CHAN(NL80211_ATTR_FREQ_AFTER, chan_after_beacon);
if (chan_before_beacon.center_freq != chan_after_beacon.center_freq)
break;
/* A beacon hint is sent _only_ if something _did_ change */
printf("beacon hint:\n");
printf("phy%d %d MHz [%d]:\n",
wiphy_idx,
chan_before_beacon.center_freq,
ieee80211_frequency_to_channel(chan_before_beacon.center_freq));
if (chan_before_beacon.passive_scan && !chan_after_beacon.passive_scan)
printf("\to active scanning enabled\n");
if (chan_before_beacon.no_ibss && !chan_after_beacon.no_ibss)
printf("\to beaconing enabled\n");
break;
case NL80211_CMD_NEW_STATION:
mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
printf("new station %s\n", macbuf);
break;
case NL80211_CMD_JOIN_IBSS:
mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
printf("IBSS %s joined\n", macbuf);
break;
case NL80211_CMD_AUTHENTICATE:
printf("auth");
if (tb[NL80211_ATTR_FRAME])
print_frame(args, tb[NL80211_ATTR_FRAME]);
else if (tb[NL80211_ATTR_TIMED_OUT])
printf(": timed out");
else
printf(": unknown event");
printf("\n");
break;
case NL80211_CMD_ASSOCIATE:
printf("assoc");
if (tb[NL80211_ATTR_FRAME])
print_frame(args, tb[NL80211_ATTR_FRAME]);
else if (tb[NL80211_ATTR_TIMED_OUT])
printf(": timed out");
else
printf(": unknown event");
printf("\n");
break;
case NL80211_CMD_DEAUTHENTICATE:
printf("deauth");
print_frame(args, tb[NL80211_ATTR_FRAME]);
printf("\n");
break;
case NL80211_CMD_DISASSOCIATE:
printf("disassoc");
print_frame(args, tb[NL80211_ATTR_FRAME]);
printf("\n");
break;
case NL80211_CMD_CONNECT:
status = 0;
if (!tb[NL80211_ATTR_STATUS_CODE])
printf("unknown connect status");
else if (nla_get_u16(tb[NL80211_ATTR_STATUS_CODE]) == 0)
printf("connected");
else {
status = nla_get_u16(tb[NL80211_ATTR_STATUS_CODE]);
printf("failed to connect");
}
if (tb[NL80211_ATTR_MAC]) {
mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
printf(" to %s", macbuf);
}
if (status)
printf(", status: %d: %s", status, get_status_str(status));
printf("\n");
break;
case NL80211_CMD_ROAM:
printf("roamed");
if (tb[NL80211_ATTR_MAC]) {
mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
printf(" to %s", macbuf);
}
printf("\n");
break;
case NL80211_CMD_DISCONNECT:
printf("disconnected");
if (tb[NL80211_ATTR_DISCONNECTED_BY_AP])
printf(" (by AP)");
else
printf(" (local request)");
if (tb[NL80211_ATTR_REASON_CODE])
printf(" reason: %d: %s", nla_get_u16(tb[NL80211_ATTR_REASON_CODE]),
get_reason_str(nla_get_u16(tb[NL80211_ATTR_REASON_CODE])));
printf("\n");
break;
default:
printf("unknown event %d\n", gnlh->cmd);
break;
}
return NL_SKIP;
#undef PARSE_BEACON_CHAN
}
struct wait_event {
int n_cmds;
const __u32 *cmds;
__u32 cmd;
struct print_event_args *pargs;
};
static int wait_event(struct nl_msg *msg, void *arg)
{
struct wait_event *wait = arg;
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
int i;
for (i = 0; i < wait->n_cmds; i++) {
if (gnlh->cmd == wait->cmds[i]) {
wait->cmd = gnlh->cmd;
if (wait->pargs)
print_event(msg, wait->pargs);
}
}
return NL_SKIP;
}
__u32 __listen_events(struct nl80211_state *state,
const int n_waits, const __u32 *waits,
struct print_event_args *args)
{
int mcid, ret;
struct nl_cb *cb = nl_cb_alloc(iw_debug ? NL_CB_DEBUG : NL_CB_DEFAULT);
struct wait_event wait_ev;
if (!cb) {
fprintf(stderr, "failed to allocate netlink callbacks\n");
return -ENOMEM;
}
/* Configuration multicast group */
mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "config");
if (mcid < 0)
return mcid;
ret = nl_socket_add_membership(state->nl_sock, mcid);
if (ret)
return ret;
/* Scan multicast group */
mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "scan");
if (mcid >= 0) {
ret = nl_socket_add_membership(state->nl_sock, mcid);
if (ret)
return ret;
}
/* Regulatory multicast group */
mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "regulatory");
if (mcid >= 0) {
ret = nl_socket_add_membership(state->nl_sock, mcid);
if (ret)
return ret;
}
/* MLME multicast group */
mcid = nl_get_multicast_id(state->nl_sock, "nl80211", "mlme");
if (mcid >= 0) {
ret = nl_socket_add_membership(state->nl_sock, mcid);
if (ret)
return ret;
}
/* no sequence checking for multicast messages */
nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL);
if (n_waits && waits) {
wait_ev.cmds = waits;
wait_ev.n_cmds = n_waits;
wait_ev.pargs = args;
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, wait_event, &wait_ev);
} else
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_event, args);
wait_ev.cmd = 0;
while (!wait_ev.cmd)
nl_recvmsgs(state->nl_sock, cb);
nl_cb_put(cb);
return wait_ev.cmd;
}
__u32 listen_events(struct nl80211_state *state,
const int n_waits, const __u32 *waits)
{
return __listen_events(state, n_waits, waits, NULL);
}
static int print_events(struct nl80211_state *state,
struct nl_cb *cb,
struct nl_msg *msg,
int argc, char **argv)
{
struct print_event_args args;
memset(&args, 0, sizeof(args));
argc--;
argv++;
while (argc > 0) {
if (strcmp(argv[0], "-f") == 0)
args.frame = true;
else if (strcmp(argv[0], "-t") == 0)
args.time = true;
else
return 1;
argc--;
argv++;
}
if (argc)
return 1;
return __listen_events(state, 0, NULL, &args);
}
TOPLEVEL(event, "[-t] [-f]", 0, 0, CIB_NONE, print_events,
"Monitor events from the kernel.\n"
"-t - print timestamp\n"
"-f - print full frame for auth/assoc etc.");
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