[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 const printfn ieprinters[] = {
	[0] = print_ssid,
	[1] = print_supprates,
	[3] = print_ds,
	[5] = print_ign,
	[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 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",
	};
	static const __u32 cmds[] = {
		NL80211_CMD_NEW_SCAN_RESULTS,
		NL80211_CMD_SCAN_ABORTED,
	};
	int 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;
	}

	dump_argv[0] = argv[0];
	return handle_cmd(state, II_NETDEV, ARRAY_SIZE(dump_argv), dump_argv);
}
TOPLEVEL(scan, NULL, 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
764fe753 JB	83	static const printfn ieprinters[] = {
	84	[0] = print_ssid,
	85	[1] = print_supprates,
	86	[3] = print_ds,
	87	[5] = print_ign,
	88	[50] = print_supprates,
	89	};
	90
4673a894 JB	91	static void tab_on_first(bool *first)
	92	{
	93	if (!*first)
	94	printf("\t");
	95	else
	96	*first = false;
	97	}
	98
	99	static void print_wifi_wps(unsigned char type, unsigned char len, unsigned char *data)
	100	{
	101	bool first = true;
	102	__u16 subtype, sublen;
	103
	104	printf("\tWPS:");
	105
	106	while (len >= 4) {
	107	subtype = (data[0] << 8) + data[1];
	108	sublen = (data[2] << 8) + data[3];
	109	if (sublen > len)
	110	break;
	111
	112	switch (subtype) {
	113	case 0x104a:
	114	tab_on_first(&first);
	115	printf("\t * Version: %#.2x\n", data[4]);
	116	break;
	117	case 0x1011:
	118	tab_on_first(&first);
	119	printf("\t * Device name: %.*s\n", sublen, data + 4);
	120	break;
	121	case 0x1021:
	122	tab_on_first(&first);
	123	printf("\t * Manufacturer: %.*s\n", sublen, data + 4);
	124	break;
	125	case 0x1023:
	126	tab_on_first(&first);
	127	printf("\t * Model: %.*s\n", sublen, data + 4);
	128	break;
	129	case 0x1008: {
	130	__u16 meth = (data[4] << 8) + data[5];
	131	bool comma = false;
	132	tab_on_first(&first);
	133	printf("\t * Config methods:");
	134	#define T(bit, name) do { \
	135	if (meth & (1<<bit)) { \
	136	if (comma) \
	137	printf(","); \
	138	comma = true; \
	139	printf(" " name); \
	140	} } while (0)
	141	T(0, "USB");
	142	T(1, "Ethernet");
	143	T(2, "Label");
	144	T(3, "Display");
	145	T(4, "Ext. NFC");
	146	T(5, "Int. NFC");
	147	T(6, "NFC Intf.");
	148	T(7, "PBC");
	149	T(8, "Keypad");
	150	printf("\n");
	151	break;
	152	#undef T
	153	}
	154	default:
155	break;
156	}
157
158	data += sublen + 4;
159	len -= sublen + 4;
160	}
161
162	if (len != 0) {
163	printf("\t\t * bogus tail data (%d):", len);
164	while (len) {
165	printf(" %.2x", *data);
166	data++;
167	len--;
168	}
169	printf("\n");
170	}
171	}
172
173	static const printfn wifiprinters[] = {
174	[4] = print_wifi_wps,
175	};
176
764fe753 JB	177	static void print_vendor(unsigned char len, unsigned char *data,
764fe753 JB	178	struct scan_params *params)
3563f4c5 JB	179	{
	180	int i;
	181
fbf80af5	182	if (len < 3) {
4673a894	183	printf("\tVendor specific: <too short> data:");
fbf80af5 JB	184	for(i = 0; i < len; i++)
	185	printf(" %.02x", data[i]);
	186	printf("\n");
	187	return;
	188	}
	189
4673a894 JB	190	if (len >= 4 && data[0] == 0x00 && data[1] == 0x50 && data[2] == 0xF2) {
	191	if (data[3] < ARRAY_SIZE(wifiprinters) && wifiprinters[data[3]])
	192	return wifiprinters[data[3]](data[3], len - 4, data + 4);
	193	if (!params->unknown)
	194	return;
	195	printf("\tWiFi OUI %#.2x data:", data[3]);
	196	for(i = 0; i < len - 4; i++)
	197	printf(" %.02x", data[i + 4]);
	198	printf("\n");
	199	return;
	200	}
	201
764fe753 JB	202	if (!params->unknown)
	203	return;
	204
fbf80af5	205	printf("\tVendor specific: OUI %.2x:%.2x:%.2x, data:",
3563f4c5	206	data[0], data[1], data[2]);
fbf80af5 JB	207	for (i = 3; i < len; i++)
fbf80af5 JB	208	printf(" %.2x", data[i]);
3563f4c5 JB	209	printf("\n");
	210	}
	211
764fe753	212	static void print_ies(unsigned char ie, int ielen, struct scan_params params)
3563f4c5 JB	213	{
3563f4c5 JB	214	while (ielen >= 2 && ielen >= ie[1]) {
97ebbaf5	215	if (ie[0] < ARRAY_SIZE(ieprinters) && ieprinters[ie[0]]) {
3563f4c5	216	ieprinters[ie[0]](ie[0], ie[1], ie + 2);
764fe753 JB	217	} else if (ie[0] == 221 /* vendor */) {
	218	print_vendor(ie[1], ie + 2, params);
	219	} else if (params->unknown) {
3563f4c5 JB	220	int i;
3563f4c5 JB	221
8086b700	222	printf("\tUnknown IE (%d):", ie[0]);
3563f4c5	223	for (i=0; i<ie[1]; i++)
8086b700	224	printf(" %.2x", ie[2+i]);
3563f4c5 JB	225	printf("\n");
	226	}
	227	ielen -= ie[1] + 2;
	228	ie += ie[1] + 2;
	229	}
	230	}
	231
	232	static int print_bss_handler(struct nl_msg msg, void arg)
	233	{
	234	struct nlattr *tb[NL80211_ATTR_MAX + 1];
	235	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
	236	struct nlattr *bss[NL80211_BSS_MAX + 1];
	237	char mac_addr[20], dev[20];
	238	static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
	239	[NL80211_BSS_TSF] = { .type = NLA_U64 },
	240	[NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
	241	[NL80211_BSS_BSSID] = { },
	242	[NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
	243	[NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
	244	[NL80211_BSS_INFORMATION_ELEMENTS] = { },
f2e17e1f JB	245	[NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
f2e17e1f JB	246	[NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
3563f4c5 JB	247	};
	248
	249	nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
	250	genlmsg_attrlen(gnlh, 0), NULL);
	251
	252	if (!tb[NL80211_ATTR_BSS]) {
	253	fprintf(stderr, "bss info missing!");
	254	return NL_SKIP;
	255	}
	256	if (nla_parse_nested(bss, NL80211_BSS_MAX,
	257	tb[NL80211_ATTR_BSS],
	258	bss_policy)) {
	259	fprintf(stderr, "failed to parse nested attributes!");
	260	return NL_SKIP;
	261	}
	262
	263	if (!bss[NL80211_BSS_BSSID])
	264	return NL_SKIP;
	265
	266	mac_addr_n2a(mac_addr, nla_data(bss[NL80211_BSS_BSSID]));
	267	if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev);
	268	printf("BSS %s (on %s)\n", mac_addr, dev);
	269
e7109a8a JB	270	if (bss[NL80211_BSS_TSF]) {
	271	unsigned long long tsf;
	272	tsf = (unsigned long long)nla_get_u64(bss[NL80211_BSS_TSF]);
	273	printf("\tTSF: %llu usec (%llud, %.2lld:%.2llu:%.2llu)\n",
	274	tsf, tsf/1000/1000/60/60/24, (tsf/1000/1000/60/60) % 24,
	275	(tsf/1000/1000/60) % 60, (tsf/1000/1000) % 60);
	276	}
3563f4c5 JB	277	if (bss[NL80211_BSS_FREQUENCY])
	278	printf("\tfreq: %d\n",
	279	nla_get_u32(bss[NL80211_BSS_FREQUENCY]));
	280	if (bss[NL80211_BSS_BEACON_INTERVAL])
	281	printf("\tbeacon interval: %d\n",
	282	nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]));
	283	if (bss[NL80211_BSS_CAPABILITY])
	284	printf("\tcapability: 0x%.4x\n",
	285	nla_get_u16(bss[NL80211_BSS_CAPABILITY]));
f2e17e1f JB	286	if (bss[NL80211_BSS_SIGNAL_MBM]) {
	287	int s = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
	288	printf("\tsignal: %d.%.2d dBm\n", s/100, s%100);
	289	}
	290	if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
	291	unsigned char s = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
	292	printf("\tsignal: %d/100\n", s);
	293	}
3563f4c5 JB	294	if (bss[NL80211_BSS_INFORMATION_ELEMENTS])
3563f4c5 JB	295	print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
764fe753 JB	296	nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
764fe753 JB	297	arg);
3563f4c5 JB	298
	299	return NL_SKIP;
	300	}
	301
764fe753	302	static struct scan_params scan_params;
3563f4c5	303
7c37a24d JB	304	static int handle_scan_dump(struct nl80211_state *state,
7c37a24d JB	305	struct nl_cb *cb,
3563f4c5 JB	306	struct nl_msg *msg,
	307	int argc, char **argv)
	308	{
764fe753 JB	309	if (argc > 1)
	310	return 1;
	311
	312	scan_params.unknown = false;
	313	if (argc == 1 && !strcmp(argv[0], "-u"))
	314	scan_params.unknown = true;
	315
	316	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_bss_handler,
	317	&scan_params);
3563f4c5 JB	318	return 0;
3563f4c5 JB	319	}
764fe753	320	COMMAND(scan, dump, "[-u]",
3563f4c5	321	NL80211_CMD_GET_SCAN, NLM_F_DUMP, CIB_NETDEV, handle_scan_dump);
a5fe4ef2 JB	322
	323	static int handle_scan_combined(struct nl80211_state *state,
	324	struct nl_cb *cb,
	325	struct nl_msg *msg,
	326	int argc, char **argv)
	327	{
	328	static char *trig_argv[] = {
	329	NULL,
	330	"scan",
	331	"trigger",
	332	};
	333	static char *dump_argv[] = {
	334	NULL,
	335	"scan",
	336	"dump",
	337	};
	338	static const __u32 cmds[] = {
	339	NL80211_CMD_NEW_SCAN_RESULTS,
	340	NL80211_CMD_SCAN_ABORTED,
	341	};
	342	int err;
	343
	344	trig_argv[0] = argv[0];
	345	err = handle_cmd(state, II_NETDEV, ARRAY_SIZE(trig_argv), trig_argv);
	346	if (err)
	347	return err;
	348
61725dbe JB	349	/*
	350	* WARNING: DO NOT COPY THIS CODE INTO YOUR APPLICATION
	351	*
	352	* This code has a bug, which requires creating a separate
	353	* nl80211 socket to fix:
	354	* It is possible for a NL80211_CMD_NEW_SCAN_RESULTS or
	355	* NL80211_CMD_SCAN_ABORTED message to be sent by the kernel
	356	* before (!) we listen to it, because we only start listening
	357	* after we send our scan request.
	358	*
	359	* Doing it the other way around has a race condition as well,
	360	* if you first open the events socket you may get a notification
	361	* for a previous scan.
	362	*
	363	* The only proper way to fix this would be to listen to events
	364	* before sending the command, and for the kernel to send the
	365	* scan request along with the event, so that you can match up
	366	* whether the scan you requested was finished or aborted (this
	367	* may result in processing a scan that another application
	368	* requested, but that doesn't seem to be a problem).
	369	*
	370	* Alas, the kernel doesn't do that (yet).
	371	*/
	372
a5fe4ef2 JB	373	if (listen_events(state, ARRAY_SIZE(cmds), cmds) ==
	374	NL80211_CMD_SCAN_ABORTED) {
	375	printf("scan aborted!\n");
	376	return 0;
	377	}
	378
	379	dump_argv[0] = argv[0];
	380	return handle_cmd(state, II_NETDEV, ARRAY_SIZE(dump_argv), dump_argv);
	381	}
	382	TOPLEVEL(scan, NULL, 0, 0, CIB_NETDEV, handle_scan_combined);