[thirdparty/iw.git] / scan.c

#include <net/if.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <stdbool.h>

#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netlink/msg.h>
#include <netlink/attr.h>

#include "nl80211.h"
#include "iw.h"

struct scan_params {
	bool unknown;
};

static int handle_scan(struct nl80211_state *state,
		       struct nl_cb *cb,
		       struct nl_msg *msg,
		       int argc, char **argv)
{
	struct nl_msg *ssids = NULL;
	int err = -ENOBUFS;

	ssids = nlmsg_alloc();
	if (!ssids)
		return -ENOMEM;
	NLA_PUT(ssids, 1, 0, "");
	nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids);

	err = 0;
 nla_put_failure:
	nlmsg_free(ssids);
	return err;
}
COMMAND(scan, trigger, NULL,
	NL80211_CMD_TRIGGER_SCAN, 0, CIB_NETDEV, handle_scan);

typedef void (*printfn)(unsigned char type, unsigned char len, unsigned char *data);

static void print_ssid(unsigned char type, unsigned char len, unsigned char *data)
{
	int i;
	printf("\tSSID: ");
	for (i=0; i<len; i++) {
		if (isprint(data[i]))
			printf("%c", data[i]);
		else
			printf("\\x%.2x", data[i]);
	}
	printf("\n");
}

static void print_supprates(unsigned char type, unsigned char len, unsigned char *data)
{
	int i;

	if (type == 1)
		printf("\tSupported rates: ");
	else
		printf("\tExtended supported rates: ");

	for (i=0; i<len; i++) {
		int r = data[i] & 0x7f;
		printf("%d.%d%s ", r/2, 5*(r&1), data[i] & 0x80 ? "*":"");
	}
	printf("\n");
}

static void print_ds(unsigned char type, unsigned char len, unsigned char *data)
{
	printf("\tDS Parameter set: channel %d\n", data[0]);
}

static void print_ign(unsigned char type, unsigned char len, unsigned char *data)
{
	/* ignore for now, not too useful */
}

static void print_country(unsigned char type, unsigned char len, unsigned char *data)
{
	int i;

	printf("\tCountry: %.*s", 2, data);
	switch (data[2]) {
	case 'I':
		printf(" (indoor)");
		break;
	case 'O':
		printf(" (outdoor)");
		break;
	}
	printf(", data:");
	for(i=0; i<len-3; i++)
		printf(" %.02x", data[i + 3]);
	printf("\n");
}

static void print_erp(unsigned char type, unsigned char len, unsigned char *data)
{
	if (data[0] == 0x00)
		return;

	printf("\tERP:");
	if (data[0] & 0x01)
		printf(" NonERP_Present");
	if (data[0] & 0x02)
		printf(" Use_Protection");
	if (data[0] & 0x04)
		printf(" Barker_Preamble_Mode");
	printf("\n");
}

static const printfn ieprinters[] = {
	[0] = print_ssid,
	[1] = print_supprates,
	[3] = print_ds,
	[5] = print_ign,
	[7] = print_country,
	[42] = print_erp,
	[50] = print_supprates,
};

static void tab_on_first(bool *first)
{
	if (!*first)
		printf("\t");
	else
		*first = false;
}

static void print_wifi_wps(unsigned char type, unsigned char len, unsigned char *data)
{
	bool first = true;
	__u16 subtype, sublen;

	printf("\tWPS:");

	while (len >= 4) {
		subtype = (data[0] << 8) + data[1];
		sublen = (data[2] << 8) + data[3];
		if (sublen > len)
			break;

		switch (subtype) {
		case 0x104a:
			tab_on_first(&first);
			printf("\t * Version: %#.2x\n", data[4]);
			break;
		case 0x1011:
			tab_on_first(&first);
			printf("\t * Device name: %.*s\n", sublen, data + 4);
			break;
		case 0x1021:
			tab_on_first(&first);
			printf("\t * Manufacturer: %.*s\n", sublen, data + 4);
			break;
		case 0x1023:
			tab_on_first(&first);
			printf("\t * Model: %.*s\n", sublen, data + 4);
			break;
		case 0x1057: {
			__u16 val = (data[4] << 8) | data[5];
			tab_on_first(&first);
			printf("\t * AP setup locked: 0x%.4x\n", val);
			break;
		}
		case 0x1008: {
			__u16 meth = (data[4] << 8) + data[5];
			bool comma = false;
			tab_on_first(&first);
			printf("\t * Config methods:");
#define T(bit, name) do {		\
	if (meth & (1<<bit)) {		\
		if (comma)		\
			printf(",");	\
		comma = true;		\
		printf(" " name);	\
	} } while (0)
			T(0, "USB");
			T(1, "Ethernet");
			T(2, "Label");
			T(3, "Display");
			T(4, "Ext. NFC");
			T(5, "Int. NFC");
			T(6, "NFC Intf.");
			T(7, "PBC");
			T(8, "Keypad");
			printf("\n");
			break;
#undef T
		}
		default:
			break;
		}

		data += sublen + 4;
		len -= sublen + 4;
	}

	if (len != 0) {
		printf("\t\t * bogus tail data (%d):", len);
		while (len) {
			printf(" %.2x", *data);
			data++;
			len--;
		}
		printf("\n");
	}
}

static const printfn wifiprinters[] = {
	[4] = print_wifi_wps,
};

static void print_vendor(unsigned char len, unsigned char *data,
			 struct scan_params *params)
{
	int i;

	if (len < 3) {
		printf("\tVendor specific: <too short> data:");
		for(i = 0; i < len; i++)
			printf(" %.02x", data[i]);
		printf("\n");
		return;
	}

	if (len >= 4 && data[0] == 0x00 && data[1] == 0x50 && data[2] == 0xF2) {
		if (data[3] < ARRAY_SIZE(wifiprinters) && wifiprinters[data[3]])
			return wifiprinters[data[3]](data[3], len - 4, data + 4);
		if (!params->unknown)
			return;
		printf("\tWiFi OUI %#.2x data:", data[3]);
		for(i = 0; i < len - 4; i++)
			printf(" %.02x", data[i + 4]);
		printf("\n");
		return;
	}

	if (!params->unknown)
		return;

	printf("\tVendor specific: OUI %.2x:%.2x:%.2x, data:",
		data[0], data[1], data[2]);
	for (i = 3; i < len; i++)
		printf(" %.2x", data[i]);
	printf("\n");
}

static void print_ies(unsigned char *ie, int ielen, struct scan_params *params)
{
	while (ielen >= 2 && ielen >= ie[1]) {
		if (ie[0] < ARRAY_SIZE(ieprinters) && ieprinters[ie[0]]) {
			ieprinters[ie[0]](ie[0], ie[1], ie + 2);
		} else if (ie[0] == 221 /* vendor */) {
			print_vendor(ie[1], ie + 2, params);
		} else if (params->unknown) {
			int i;

			printf("\tUnknown IE (%d):", ie[0]);
			for (i=0; i<ie[1]; i++)
				printf(" %.2x", ie[2+i]);
			printf("\n");
		}
		ielen -= ie[1] + 2;
		ie += ie[1] + 2;
	}
}

static int print_bss_handler(struct nl_msg *msg, void *arg)
{
	struct nlattr *tb[NL80211_ATTR_MAX + 1];
	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
	struct nlattr *bss[NL80211_BSS_MAX + 1];
	char mac_addr[20], dev[20];
	static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
		[NL80211_BSS_TSF] = { .type = NLA_U64 },
		[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
		[NL80211_BSS_BSSID] = { },
		[NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
		[NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
		[NL80211_BSS_INFORMATION_ELEMENTS] = { },
		[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
		[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
	};

	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
		  genlmsg_attrlen(gnlh, 0), NULL);

	if (!tb[NL80211_ATTR_BSS]) {
		fprintf(stderr, "bss info missing!");
		return NL_SKIP;
	}
	if (nla_parse_nested(bss, NL80211_BSS_MAX,
			     tb[NL80211_ATTR_BSS],
			     bss_policy)) {
		fprintf(stderr, "failed to parse nested attributes!");
		return NL_SKIP;
	}

	if (!bss[NL80211_BSS_BSSID])
		return NL_SKIP;

	mac_addr_n2a(mac_addr, nla_data(bss[NL80211_BSS_BSSID]));
	if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
	printf("BSS %s (on %s)\n", mac_addr, dev);

	if (bss[NL80211_BSS_TSF]) {
		unsigned long long tsf;
		tsf = (unsigned long long)nla_get_u64(bss[NL80211_BSS_TSF]);
		printf("\tTSF: %llu usec (%llud, %.2lld:%.2llu:%.2llu)\n",
			tsf, tsf/1000/1000/60/60/24, (tsf/1000/1000/60/60) % 24,
			(tsf/1000/1000/60) % 60, (tsf/1000/1000) % 60);
	}
	if (bss[NL80211_BSS_FREQUENCY])
		printf("\tfreq: %d\n",
			nla_get_u32(bss[NL80211_BSS_FREQUENCY]));
	if (bss[NL80211_BSS_BEACON_INTERVAL])
		printf("\tbeacon interval: %d\n",
			nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]));
	if (bss[NL80211_BSS_CAPABILITY])
		printf("\tcapability: 0x%.4x\n",
			nla_get_u16(bss[NL80211_BSS_CAPABILITY]));
	if (bss[NL80211_BSS_SIGNAL_MBM]) {
		int s = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
		printf("\tsignal: %d.%.2d dBm\n", s/100, s%100);
	}
	if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
		unsigned char s = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
		printf("\tsignal: %d/100\n", s);
	}
	if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
		print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
			  nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
			  arg);

	return NL_SKIP;
}

static struct scan_params scan_params;

static int handle_scan_dump(struct nl80211_state *state,
			    struct nl_cb *cb,
			    struct nl_msg *msg,
			    int argc, char **argv)
{
	if (argc > 1)
		return 1;

	scan_params.unknown = false;
	if (argc == 1 && !strcmp(argv[0], "-u"))
		scan_params.unknown = true;

	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_bss_handler,
		  &scan_params);
	return 0;
}
COMMAND(scan, dump, "[-u]",
	NL80211_CMD_GET_SCAN, NLM_F_DUMP, CIB_NETDEV, handle_scan_dump);

static int handle_scan_combined(struct nl80211_state *state,
				struct nl_cb *cb,
				struct nl_msg *msg,
				int argc, char **argv)
{
	static char *trig_argv[] = {
		NULL,
		"scan",
		"trigger",
	};
	static char *dump_argv[] = {
		NULL,
		"scan",
		"dump",
		NULL,
	};
	static const __u32 cmds[] = {
		NL80211_CMD_NEW_SCAN_RESULTS,
		NL80211_CMD_SCAN_ABORTED,
	};
	int dump_argc, err;

	trig_argv[0] = argv[0];
	err = handle_cmd(state, II_NETDEV, ARRAY_SIZE(trig_argv), trig_argv);
	if (err)
		return err;

	/*
	 * WARNING: DO NOT COPY THIS CODE INTO YOUR APPLICATION
	 *
	 * This code has a bug, which requires creating a separate
	 * nl80211 socket to fix:
	 * It is possible for a NL80211_CMD_NEW_SCAN_RESULTS or
	 * NL80211_CMD_SCAN_ABORTED message to be sent by the kernel
	 * before (!) we listen to it, because we only start listening
	 * after we send our scan request.
	 *
	 * Doing it the other way around has a race condition as well,
	 * if you first open the events socket you may get a notification
	 * for a previous scan.
	 *
	 * The only proper way to fix this would be to listen to events
	 * before sending the command, and for the kernel to send the
	 * scan request along with the event, so that you can match up
	 * whether the scan you requested was finished or aborted (this
	 * may result in processing a scan that another application
	 * requested, but that doesn't seem to be a problem).
	 *
	 * Alas, the kernel doesn't do that (yet).
	 */

	if (listen_events(state, ARRAY_SIZE(cmds), cmds) ==
					NL80211_CMD_SCAN_ABORTED) {
		printf("scan aborted!\n");
		return 0;
	}

	if (argc == 3 && !strcmp(argv[2], "-u")) {
		dump_argc = 4;
		dump_argv[3] = "-u";
	} else
		dump_argc = 3;

	dump_argv[0] = argv[0];
	return handle_cmd(state, II_NETDEV, dump_argc, dump_argv);
}
TOPLEVEL(scan, "[-u]", 0, 0, CIB_NETDEV, handle_scan_combined);
Commit	Line	Data
3563f4c5 JB	1	#include <net/if.h>
	2	#include <errno.h>
	3	#include <string.h>
	4	#include <ctype.h>
764fe753	5	#include <stdbool.h>
3563f4c5 JB	6
	7	#include <netlink/genl/genl.h>
	8	#include <netlink/genl/family.h>
	9	#include <netlink/genl/ctrl.h>
	10	#include <netlink/msg.h>
	11	#include <netlink/attr.h>
	12
	13	#include "nl80211.h"
	14	#include "iw.h"
	15
764fe753 JB	16	struct scan_params {
	17	bool unknown;
	18	};
	19
7c37a24d JB	20	static int handle_scan(struct nl80211_state *state,
7c37a24d JB	21	struct nl_cb *cb,
3563f4c5 JB	22	struct nl_msg *msg,
	23	int argc, char **argv)
	24	{
	25	struct nl_msg *ssids = NULL;
	26	int err = -ENOBUFS;
	27
	28	ssids = nlmsg_alloc();
	29	if (!ssids)
	30	return -ENOMEM;
	31	NLA_PUT(ssids, 1, 0, "");
	32	nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids);
	33
	34	err = 0;
	35	nla_put_failure:
	36	nlmsg_free(ssids);
	37	return err;
	38	}
	39	COMMAND(scan, trigger, NULL,
	40	NL80211_CMD_TRIGGER_SCAN, 0, CIB_NETDEV, handle_scan);
	41
	42	typedef void (printfn)(unsigned char type, unsigned char len, unsigned char data);
	43
	44	static void print_ssid(unsigned char type, unsigned char len, unsigned char *data)
	45	{
	46	int i;
	47	printf("\tSSID: ");
	48	for (i=0; i<len; i++) {
	49	if (isprint(data[i]))
	50	printf("%c", data[i]);
	51	else
	52	printf("\\x%.2x", data[i]);
	53	}
	54	printf("\n");
	55	}
	56
	57	static void print_supprates(unsigned char type, unsigned char len, unsigned char *data)
	58	{
	59	int i;
	60
	61	if (type == 1)
	62	printf("\tSupported rates: ");
	63	else
	64	printf("\tExtended supported rates: ");
	65
	66	for (i=0; i<len; i++) {
	67	int r = data[i] & 0x7f;
	68	printf("%d.%d%s ", r/2, 5(r&1), data[i] & 0x80 ? "":"");
	69	}
	70	printf("\n");
	71	}
	72
	73	static void print_ds(unsigned char type, unsigned char len, unsigned char *data)
	74	{
	75	printf("\tDS Parameter set: channel %d\n", data[0]);
	76	}
	77
	78	static void print_ign(unsigned char type, unsigned char len, unsigned char *data)
	79	{
	80	/* ignore for now, not too useful */
	81	}
	82
b7e8fa37 MH	83	static void print_country(unsigned char type, unsigned char len, unsigned char *data)
	84	{
	85	int i;
	86
	87	printf("\tCountry: %.*s", 2, data);
	88	switch (data[2]) {
	89	case 'I':
	90	printf(" (indoor)");
	91	break;
	92	case 'O':
	93	printf(" (outdoor)");
	94	break;
	95	}
	96	printf(", data:");
	97	for(i=0; i<len-3; i++)
	98	printf(" %.02x", data[i + 3]);
	99	printf("\n");
	100	}
	101
fc4d1484 MH	102	static void print_erp(unsigned char type, unsigned char len, unsigned char *data)
	103	{
	104	if (data[0] == 0x00)
	105	return;
	106
	107	printf("\tERP:");
	108	if (data[0] & 0x01)
	109	printf(" NonERP_Present");
	110	if (data[0] & 0x02)
	111	printf(" Use_Protection");
	112	if (data[0] & 0x04)
	113	printf(" Barker_Preamble_Mode");
	114	printf("\n");
	115	}
	116
764fe753 JB	117	static const printfn ieprinters[] = {
	118	[0] = print_ssid,
	119	[1] = print_supprates,
	120	[3] = print_ds,
	121	[5] = print_ign,
b7e8fa37	122	[7] = print_country,
fc4d1484	123	[42] = print_erp,
764fe753 JB	124	[50] = print_supprates,
	125	};
	126
4673a894 JB	127	static void tab_on_first(bool *first)
	128	{
	129	if (!*first)
	130	printf("\t");
	131	else
	132	*first = false;
	133	}
	134
	135	static void print_wifi_wps(unsigned char type, unsigned char len, unsigned char *data)
	136	{
	137	bool first = true;
	138	__u16 subtype, sublen;
	139
	140	printf("\tWPS:");
	141
	142	while (len >= 4) {
	143	subtype = (data[0] << 8) + data[1];
	144	sublen = (data[2] << 8) + data[3];
	145	if (sublen > len)
	146	break;
	147
	148	switch (subtype) {
	149	case 0x104a:
	150	tab_on_first(&first);
	151	printf("\t * Version: %#.2x\n", data[4]);
	152	break;
	153	case 0x1011:
	154	tab_on_first(&first);
	155	printf("\t * Device name: %.*s\n", sublen, data + 4);
	156	break;
	157	case 0x1021:
	158	tab_on_first(&first);
	159	printf("\t * Manufacturer: %.*s\n", sublen, data + 4);
	160	break;
	161	case 0x1023:
	162	tab_on_first(&first);
	163	printf("\t * Model: %.*s\n", sublen, data + 4);
	164	break;
7ee5a865 JB	165	case 0x1057: {
	166	__u16 val = (data[4] << 8) \| data[5];
	167	tab_on_first(&first);
	168	printf("\t * AP setup locked: 0x%.4x\n", val);
	169	break;
	170	}
4673a894 JB	171	case 0x1008: {
	172	__u16 meth = (data[4] << 8) + data[5];
	173	bool comma = false;
	174	tab_on_first(&first);
	175	printf("\t * Config methods:");
	176	#define T(bit, name) do { \
	177	if (meth & (1<<bit)) { \
	178	if (comma) \
	179	printf(","); \
	180	comma = true; \
	181	printf(" " name); \
	182	} } while (0)
	183	T(0, "USB");
	184	T(1, "Ethernet");
	185	T(2, "Label");
	186	T(3, "Display");
	187	T(4, "Ext. NFC");
	188	T(5, "Int. NFC");
	189	T(6, "NFC Intf.");
	190	T(7, "PBC");
	191	T(8, "Keypad");
	192	printf("\n");
	193	break;
	194	#undef T
	195	}
	196	default:
	197	break;
	198	}
	199
	200	data += sublen + 4;
	201	len -= sublen + 4;
	202	}
	203
	204	if (len != 0) {
	205	printf("\t\t * bogus tail data (%d):", len);
	206	while (len) {
	207	printf(" %.2x", *data);
	208	data++;
	209	len--;
	210	}
	211	printf("\n");
	212	}
	213	}
	214
	215	static const printfn wifiprinters[] = {
	216	[4] = print_wifi_wps,
	217	};
	218
764fe753 JB	219	static void print_vendor(unsigned char len, unsigned char *data,
764fe753 JB	220	struct scan_params *params)
3563f4c5 JB	221	{
	222	int i;
	223
fbf80af5	224	if (len < 3) {
4673a894	225	printf("\tVendor specific: <too short> data:");
fbf80af5 JB	226	for(i = 0; i < len; i++)
	227	printf(" %.02x", data[i]);
	228	printf("\n");
	229	return;
	230	}
	231
4673a894 JB	232	if (len >= 4 && data[0] == 0x00 && data[1] == 0x50 && data[2] == 0xF2) {
	233	if (data[3] < ARRAY_SIZE(wifiprinters) && wifiprinters[data[3]])
	234	return wifiprinters[data[3]](data[3], len - 4, data + 4);
	235	if (!params->unknown)
	236	return;
	237	printf("\tWiFi OUI %#.2x data:", data[3]);
	238	for(i = 0; i < len - 4; i++)
	239	printf(" %.02x", data[i + 4]);
	240	printf("\n");
	241	return;
	242	}
	243
764fe753 JB	244	if (!params->unknown)
	245	return;
	246
fbf80af5	247	printf("\tVendor specific: OUI %.2x:%.2x:%.2x, data:",
3563f4c5	248	data[0], data[1], data[2]);
fbf80af5 JB	249	for (i = 3; i < len; i++)
fbf80af5 JB	250	printf(" %.2x", data[i]);
3563f4c5 JB	251	printf("\n");
	252	}
	253
764fe753	254	static void print_ies(unsigned char ie, int ielen, struct scan_params params)
3563f4c5 JB	255	{
3563f4c5 JB	256	while (ielen >= 2 && ielen >= ie[1]) {
97ebbaf5	257	if (ie[0] < ARRAY_SIZE(ieprinters) && ieprinters[ie[0]]) {
3563f4c5	258	ieprinters[ie[0]](ie[0], ie[1], ie + 2);
764fe753 JB	259	} else if (ie[0] == 221 /* vendor */) {
	260	print_vendor(ie[1], ie + 2, params);
	261	} else if (params->unknown) {
3563f4c5 JB	262	int i;
3563f4c5 JB	263
8086b700	264	printf("\tUnknown IE (%d):", ie[0]);
3563f4c5	265	for (i=0; i<ie[1]; i++)
8086b700	266	printf(" %.2x", ie[2+i]);
3563f4c5 JB	267	printf("\n");
	268	}
	269	ielen -= ie[1] + 2;
	270	ie += ie[1] + 2;
	271	}
	272	}
	273
	274	static int print_bss_handler(struct nl_msg msg, void arg)
	275	{
	276	struct nlattr *tb[NL80211_ATTR_MAX + 1];
	277	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
	278	struct nlattr *bss[NL80211_BSS_MAX + 1];
	279	char mac_addr[20], dev[20];
	280	static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
	281	[NL80211_BSS_TSF] = { .type = NLA_U64 },
	282	[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
	283	[NL80211_BSS_BSSID] = { },
	284	[NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
	285	[NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
	286	[NL80211_BSS_INFORMATION_ELEMENTS] = { },
f2e17e1f JB	287	[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
f2e17e1f JB	288	[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
3563f4c5 JB	289	};
	290
	291	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
	292	genlmsg_attrlen(gnlh, 0), NULL);
	293
	294	if (!tb[NL80211_ATTR_BSS]) {
	295	fprintf(stderr, "bss info missing!");
	296	return NL_SKIP;
	297	}
	298	if (nla_parse_nested(bss, NL80211_BSS_MAX,
	299	tb[NL80211_ATTR_BSS],
	300	bss_policy)) {
	301	fprintf(stderr, "failed to parse nested attributes!");
	302	return NL_SKIP;
	303	}
	304
	305	if (!bss[NL80211_BSS_BSSID])
	306	return NL_SKIP;
	307
	308	mac_addr_n2a(mac_addr, nla_data(bss[NL80211_BSS_BSSID]));
	309	if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
	310	printf("BSS %s (on %s)\n", mac_addr, dev);
	311
e7109a8a JB	312	if (bss[NL80211_BSS_TSF]) {
	313	unsigned long long tsf;
	314	tsf = (unsigned long long)nla_get_u64(bss[NL80211_BSS_TSF]);
	315	printf("\tTSF: %llu usec (%llud, %.2lld:%.2llu:%.2llu)\n",
	316	tsf, tsf/1000/1000/60/60/24, (tsf/1000/1000/60/60) % 24,
	317	(tsf/1000/1000/60) % 60, (tsf/1000/1000) % 60);
	318	}
3563f4c5 JB	319	if (bss[NL80211_BSS_FREQUENCY])
	320	printf("\tfreq: %d\n",
	321	nla_get_u32(bss[NL80211_BSS_FREQUENCY]));
	322	if (bss[NL80211_BSS_BEACON_INTERVAL])
	323	printf("\tbeacon interval: %d\n",
	324	nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]));
	325	if (bss[NL80211_BSS_CAPABILITY])
	326	printf("\tcapability: 0x%.4x\n",
	327	nla_get_u16(bss[NL80211_BSS_CAPABILITY]));
f2e17e1f JB	328	if (bss[NL80211_BSS_SIGNAL_MBM]) {
	329	int s = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
	330	printf("\tsignal: %d.%.2d dBm\n", s/100, s%100);
	331	}
	332	if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
	333	unsigned char s = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
	334	printf("\tsignal: %d/100\n", s);
	335	}
3563f4c5 JB	336	if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
3563f4c5 JB	337	print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
764fe753 JB	338	nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
764fe753 JB	339	arg);
3563f4c5 JB	340
	341	return NL_SKIP;
	342	}
	343
764fe753	344	static struct scan_params scan_params;
3563f4c5	345
7c37a24d JB	346	static int handle_scan_dump(struct nl80211_state *state,
7c37a24d JB	347	struct nl_cb *cb,
3563f4c5 JB	348	struct nl_msg *msg,
	349	int argc, char **argv)
	350	{
764fe753 JB	351	if (argc > 1)
	352	return 1;
	353
	354	scan_params.unknown = false;
	355	if (argc == 1 && !strcmp(argv[0], "-u"))
	356	scan_params.unknown = true;
	357
	358	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_bss_handler,
	359	&scan_params);
3563f4c5 JB	360	return 0;
3563f4c5 JB	361	}
764fe753	362	COMMAND(scan, dump, "[-u]",
3563f4c5	363	NL80211_CMD_GET_SCAN, NLM_F_DUMP, CIB_NETDEV, handle_scan_dump);
a5fe4ef2 JB	364
	365	static int handle_scan_combined(struct nl80211_state *state,
	366	struct nl_cb *cb,
	367	struct nl_msg *msg,
	368	int argc, char **argv)
	369	{
	370	static char *trig_argv[] = {
	371	NULL,
	372	"scan",
	373	"trigger",
	374	};
	375	static char *dump_argv[] = {
	376	NULL,
	377	"scan",
	378	"dump",
92649eab	379	NULL,
a5fe4ef2 JB	380	};
	381	static const __u32 cmds[] = {
	382	NL80211_CMD_NEW_SCAN_RESULTS,
	383	NL80211_CMD_SCAN_ABORTED,
	384	};
92649eab	385	int dump_argc, err;
a5fe4ef2 JB	386
	387	trig_argv[0] = argv[0];
	388	err = handle_cmd(state, II_NETDEV, ARRAY_SIZE(trig_argv), trig_argv);
	389	if (err)
	390	return err;
	391
61725dbe JB	392	/*
	393	* WARNING: DO NOT COPY THIS CODE INTO YOUR APPLICATION
	394	*
	395	* This code has a bug, which requires creating a separate
	396	* nl80211 socket to fix:
	397	* It is possible for a NL80211_CMD_NEW_SCAN_RESULTS or
	398	* NL80211_CMD_SCAN_ABORTED message to be sent by the kernel
	399	* before (!) we listen to it, because we only start listening
	400	* after we send our scan request.
	401	*
	402	* Doing it the other way around has a race condition as well,
	403	* if you first open the events socket you may get a notification
	404	* for a previous scan.
	405	*
	406	* The only proper way to fix this would be to listen to events
	407	* before sending the command, and for the kernel to send the
	408	* scan request along with the event, so that you can match up
	409	* whether the scan you requested was finished or aborted (this
	410	* may result in processing a scan that another application
	411	* requested, but that doesn't seem to be a problem).
	412	*
	413	* Alas, the kernel doesn't do that (yet).
	414	*/
	415
a5fe4ef2 JB	416	if (listen_events(state, ARRAY_SIZE(cmds), cmds) ==
	417	NL80211_CMD_SCAN_ABORTED) {
	418	printf("scan aborted!\n");
	419	return 0;
	420	}
	421
92649eab MH	422	if (argc == 3 && !strcmp(argv[2], "-u")) {
	423	dump_argc = 4;
	424	dump_argv[3] = "-u";
	425	} else
	426	dump_argc = 3;
	427
a5fe4ef2	428	dump_argv[0] = argv[0];
92649eab	429	return handle_cmd(state, II_NETDEV, dump_argc, dump_argv);
a5fe4ef2	430	}
92649eab	431	TOPLEVEL(scan, "[-u]", 0, 0, CIB_NETDEV, handle_scan_combined);