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>
16 #define WLAN_CAPABILITY_ESS (1<<0)
17 #define WLAN_CAPABILITY_IBSS (1<<1)
18 #define WLAN_CAPABILITY_CF_POLLABLE (1<<2)
19 #define WLAN_CAPABILITY_CF_POLL_REQUEST (1<<3)
20 #define WLAN_CAPABILITY_PRIVACY (1<<4)
21 #define WLAN_CAPABILITY_SHORT_PREAMBLE (1<<5)
22 #define WLAN_CAPABILITY_PBCC (1<<6)
23 #define WLAN_CAPABILITY_CHANNEL_AGILITY (1<<7)
24 #define WLAN_CAPABILITY_SPECTRUM_MGMT (1<<8)
25 #define WLAN_CAPABILITY_QOS (1<<9)
26 #define WLAN_CAPABILITY_SHORT_SLOT_TIME (1<<10)
27 #define WLAN_CAPABILITY_APSD (1<<11)
28 #define WLAN_CAPABILITY_DSSS_OFDM (1<<13)
30 static unsigned char wifi_oui
[3] = { 0x00, 0x50, 0xf2 };
31 static unsigned char ieee80211_oui
[3] = { 0x00, 0x0f, 0xac };
37 static int handle_scan(struct nl80211_state
*state
,
40 int argc
, char **argv
)
42 struct nl_msg
*ssids
= NULL
, *freqs
= NULL
;
53 bool passive
= false, have_ssids
= false, have_freqs
= false;
55 ssids
= nlmsg_alloc();
59 freqs
= nlmsg_alloc();
65 for (i
= 0; i
< argc
; i
++) {
66 if (parse
== NONE
&& strcmp(argv
[i
], "freq") == 0) {
70 } else if (parse
< SSID
&& strcmp(argv
[i
], "ssid") == 0) {
74 } else if (parse
< SSID
&& strcmp(argv
[i
], "passive") == 0) {
85 freq
= strtoul(argv
[i
], &eptr
, 10);
86 if (eptr
!= argv
[i
] + strlen(argv
[i
]))
88 NLA_PUT_U32(freqs
, i
, freq
);
91 NLA_PUT(ssids
, i
, strlen(argv
[i
]), argv
[i
]);
97 NLA_PUT(ssids
, 1, 0, "");
99 nla_put_nested(msg
, NL80211_ATTR_SCAN_SSIDS
, ssids
);
102 nla_put_nested(msg
, NL80211_ATTR_SCAN_FREQUENCIES
, freqs
);
110 COMMAND(scan
, trigger
, "[freq <freq>*] [ssid <ssid>*|passive]",
111 NL80211_CMD_TRIGGER_SCAN
, 0, CIB_NETDEV
, handle_scan
);
113 static void tab_on_first(bool *first
)
121 static void print_ssid(const uint8_t type
, uint8_t len
, const uint8_t *data
)
127 for (i
= 0; i
< len
; i
++) {
128 if (isprint(data
[i
]))
129 printf("%c", data
[i
]);
131 printf("\\x%.2x", data
[i
]);
136 static void print_supprates(const uint8_t type
, uint8_t len
, const uint8_t *data
)
142 for (i
= 0; i
< len
; i
++) {
143 int r
= data
[i
] & 0x7f;
144 printf("%d.%d%s ", r
/2, 5*(r
&1), data
[i
] & 0x80 ? "*":"");
149 static void print_ds(const uint8_t type
, uint8_t len
, const uint8_t *data
)
151 printf(" channel %d\n", data
[0]);
154 static void print_country(const uint8_t type
, uint8_t len
, const uint8_t *data
)
158 printf(" %.*s", 2, data
);
164 printf(" (outdoor)");
167 printf(" (in/outdoor)");
170 printf(" (invalid environment)");
174 for(i
=0; i
<len
-3; i
++)
175 printf(" %.02x", data
[i
+ 3]);
179 static void print_powerconstraint(const uint8_t type
, uint8_t len
, const uint8_t *data
)
181 printf(" %d dB\n", data
[0]);
184 static void print_erp(const uint8_t type
, uint8_t len
, const uint8_t *data
)
187 printf(" <no flags>");
189 printf(" NonERP_Present");
191 printf(" Use_Protection");
193 printf(" Barker_Preamble_Mode");
197 static void print_cipher(const uint8_t *data
)
199 if (memcmp(data
, wifi_oui
, 3) == 0) {
202 printf("Use group cipher suite");
217 printf("Unknown (%.02x-%.02x-%.02x:%d)",
218 data
[0], data
[1] ,data
[2], data
[3]);
221 } else if (memcmp(data
, ieee80211_oui
, 3) == 0) {
224 printf("Use group cipher suite");
239 printf("AES-128-CMAC");
242 printf("Unknown (%.02x-%.02x-%.02x:%d)",
243 data
[0], data
[1] ,data
[2], data
[3]);
247 printf("Unknown (%.02x-%.02x-%.02x:%d)",
248 data
[0], data
[1] ,data
[2], data
[3]);
251 static void print_auth(const uint8_t *data
)
253 if (memcmp(data
, wifi_oui
, 3) == 0) {
256 printf("IEEE 802.1X");
262 printf("Unknown (%.02x-%.02x-%.02x:%d)",
263 data
[0], data
[1] ,data
[2], data
[3]);
266 } else if (memcmp(data
, ieee80211_oui
, 3) == 0) {
269 printf("IEEE 802.1X");
275 printf("Unknown (%.02x-%.02x-%.02x:%d)",
276 data
[0], data
[1] ,data
[2], data
[3]);
280 printf("Unknown (%.02x-%.02x-%.02x:%d)",
281 data
[0], data
[1] ,data
[2], data
[3]);
284 static void print_rsn_ie(const char *defcipher
, const char *defauth
,
285 uint8_t len
, const uint8_t *data
)
288 __u16 version
, count
, capa
;
291 version
= data
[0] + (data
[1] << 8);
292 tab_on_first(&first
);
293 printf("\t * Version: %d\n", version
);
299 tab_on_first(&first
);
300 printf("\t * Group cipher: %s\n", defcipher
);
301 printf("\t * Pairwise ciphers: %s\n", defcipher
);
305 tab_on_first(&first
);
306 printf("\t * Group cipher: ");
314 tab_on_first(&first
);
315 printf("\t * Pairwise ciphers: %s\n", defcipher
);
319 count
= data
[0] | (data
[1] << 8);
320 if (2 + (count
* 4) > len
)
323 tab_on_first(&first
);
324 printf("\t * Pairwise ciphers:");
325 for (i
= 0; i
< count
; i
++) {
327 print_cipher(data
+ 2 + (i
* 4));
331 data
+= 2 + (count
* 4);
332 len
-= 2 + (count
* 4);
335 tab_on_first(&first
);
336 printf("\t * Authentication suites: %s\n", defauth
);
340 count
= data
[0] | (data
[1] << 8);
341 if (2 + (count
* 4) > len
)
344 tab_on_first(&first
);
345 printf("\t * Authentication suites:");
346 for (i
= 0; i
< count
; i
++) {
348 print_auth(data
+ 2 + (i
* 4));
352 data
+= 2 + (count
* 4);
353 len
-= 2 + (count
* 4);
358 capa
= data
[0] | (data
[1] << 8);
359 tab_on_first(&first
);
360 printf("\t * Capabilities: 0x%.4x\n", capa
);
367 printf("\t\t * bogus tail data (%d):", len
);
369 printf(" %.2x", *data
);
377 static void print_rsn(const uint8_t type
, uint8_t len
, const uint8_t *data
)
379 print_rsn_ie("CCMP", "IEEE 802.1X", len
, data
);
382 static void print_capabilities(const uint8_t type
, uint8_t len
, const uint8_t *data
)
386 for(i
= 0; i
< len
; i
++)
387 printf(" %.02x", data
[i
]);
393 void (*print
)(const uint8_t type
, uint8_t len
, const uint8_t *data
);
394 uint8_t minlen
, maxlen
;
397 static void print_ie(const struct ie_print
*p
, const uint8_t type
,
398 uint8_t len
, const uint8_t *data
)
405 printf("\t%s:", p
->name
);
406 if (len
< p
->minlen
|| len
> p
->maxlen
) {
408 printf(" <invalid: %d bytes:", len
);
409 for (i
= 0; i
< len
; i
++)
410 printf(" %.02x", data
[i
]);
413 printf(" <invalid: 1 byte: %.02x>\n", data
[0]);
415 printf(" <invalid: no data>\n");
419 p
->print(type
, len
, data
);
422 #define PRINT_IGN { \
429 static const struct ie_print ieprinters
[] = {
430 [0] = { "SSID", print_ssid
, 0, 32, },
431 [1] = { "Supported rates", print_supprates
, 0, 255, },
432 [3] = { "DS Paramater set", print_ds
, 1, 1, },
434 [7] = { "Country", print_country
, 3, 255, },
435 [32] = { "Power constraint", print_powerconstraint
, 1, 1, },
436 [42] = { "ERP", print_erp
, 1, 255, },
437 [48] = { "RSN", print_rsn
, 2, 255, },
438 [50] = { "Extended supported rates", print_supprates
, 0, 255, },
439 [127] = { "Extended capabilities", print_capabilities
, 0, 255, },
442 static void print_wifi_wpa(const uint8_t type
, uint8_t len
, const uint8_t *data
)
444 print_rsn_ie("TKIP", "IEEE 802.1X", len
, data
);
447 static void print_wifi_wmm(const uint8_t type
, uint8_t len
, const uint8_t *data
)
453 printf(" information:");
456 printf(" parameter:");
459 printf(" type %d:", data
[0]);
463 for(i
= 0; i
< len
- 1; i
++)
464 printf(" %.02x", data
[i
+ 1]);
468 static void print_wifi_wps(const uint8_t type
, uint8_t len
, const uint8_t *data
)
471 __u16 subtype
, sublen
;
474 subtype
= (data
[0] << 8) + data
[1];
475 sublen
= (data
[2] << 8) + data
[3];
481 tab_on_first(&first
);
482 printf("\t * Version: %d.%d\n", data
[4] >> 4, data
[4] & 0xF);
485 tab_on_first(&first
);
486 printf("\t * Device name: %.*s\n", sublen
, data
+ 4);
489 tab_on_first(&first
);
490 printf("\t * Manufacturer: %.*s\n", sublen
, data
+ 4);
493 tab_on_first(&first
);
494 printf("\t * Model: %.*s\n", sublen
, data
+ 4);
497 __u16 val
= (data
[4] << 8) | data
[5];
498 tab_on_first(&first
);
499 printf("\t * AP setup locked: 0x%.4x\n", val
);
503 __u16 meth
= (data
[4] << 8) + data
[5];
505 tab_on_first(&first
);
506 printf("\t * Config methods:");
507 #define T(bit, name) do { \
508 if (meth & (1<<bit)) { \
536 printf("\t\t * bogus tail data (%d):", len
);
538 printf(" %.2x", *data
);
546 static const struct ie_print wifiprinters
[] = {
547 [1] = { "WPA", print_wifi_wpa
, 2, 255, },
548 [2] = { "WMM", print_wifi_wmm
, 1, 255, },
549 [4] = { "WPS", print_wifi_wps
, 0, 255, },
552 static void print_vendor(unsigned char len
, unsigned char *data
,
553 struct scan_params
*params
)
558 printf("\tVendor specific: <too short> data:");
559 for(i
= 0; i
< len
; i
++)
560 printf(" %.02x", data
[i
]);
565 if (len
>= 4 && memcmp(data
, wifi_oui
, 3) == 0) {
566 if (data
[3] < ARRAY_SIZE(wifiprinters
) && wifiprinters
[data
[3]].name
) {
567 print_ie(&wifiprinters
[data
[3]], data
[3], len
- 4, data
+ 4);
570 if (!params
->unknown
)
572 printf("\tWiFi OUI %#.2x, data:", data
[3]);
573 for(i
= 0; i
< len
- 4; i
++)
574 printf(" %.02x", data
[i
+ 4]);
579 if (!params
->unknown
)
582 printf("\tVendor specific: OUI %.2x:%.2x:%.2x, data:",
583 data
[0], data
[1], data
[2]);
584 for (i
= 3; i
< len
; i
++)
585 printf(" %.2x", data
[i
]);
589 static void print_ies(unsigned char *ie
, int ielen
, struct scan_params
*params
)
591 while (ielen
>= 2 && ielen
>= ie
[1]) {
592 if (ie
[0] < ARRAY_SIZE(ieprinters
) && ieprinters
[ie
[0]].name
) {
593 print_ie(&ieprinters
[ie
[0]], ie
[0], ie
[1], ie
+ 2);
594 } else if (ie
[0] == 221 /* vendor */) {
595 print_vendor(ie
[1], ie
+ 2, params
);
596 } else if (params
->unknown
) {
599 printf("\tUnknown IE (%d):", ie
[0]);
600 for (i
=0; i
<ie
[1]; i
++)
601 printf(" %.2x", ie
[2+i
]);
609 static int print_bss_handler(struct nl_msg
*msg
, void *arg
)
611 struct nlattr
*tb
[NL80211_ATTR_MAX
+ 1];
612 struct genlmsghdr
*gnlh
= nlmsg_data(nlmsg_hdr(msg
));
613 struct nlattr
*bss
[NL80211_BSS_MAX
+ 1];
614 char mac_addr
[20], dev
[20];
615 static struct nla_policy bss_policy
[NL80211_BSS_MAX
+ 1] = {
616 [NL80211_BSS_TSF
] = { .type
= NLA_U64
},
617 [NL80211_BSS_FREQUENCY
] = { .type
= NLA_U32
},
618 [NL80211_BSS_BSSID
] = { },
619 [NL80211_BSS_BEACON_INTERVAL
] = { .type
= NLA_U16
},
620 [NL80211_BSS_CAPABILITY
] = { .type
= NLA_U16
},
621 [NL80211_BSS_INFORMATION_ELEMENTS
] = { },
622 [NL80211_BSS_SIGNAL_MBM
] = { .type
= NLA_U32
},
623 [NL80211_BSS_SIGNAL_UNSPEC
] = { .type
= NLA_U8
},
626 nla_parse(tb
, NL80211_ATTR_MAX
, genlmsg_attrdata(gnlh
, 0),
627 genlmsg_attrlen(gnlh
, 0), NULL
);
629 if (!tb
[NL80211_ATTR_BSS
]) {
630 fprintf(stderr
, "bss info missing!");
633 if (nla_parse_nested(bss
, NL80211_BSS_MAX
,
634 tb
[NL80211_ATTR_BSS
],
636 fprintf(stderr
, "failed to parse nested attributes!");
640 if (!bss
[NL80211_BSS_BSSID
])
643 mac_addr_n2a(mac_addr
, nla_data(bss
[NL80211_BSS_BSSID
]));
644 if_indextoname(nla_get_u32(tb
[NL80211_ATTR_IFINDEX
]), dev
);
645 printf("BSS %s (on %s)\n", mac_addr
, dev
);
647 if (bss
[NL80211_BSS_TSF
]) {
648 unsigned long long tsf
;
649 tsf
= (unsigned long long)nla_get_u64(bss
[NL80211_BSS_TSF
]);
650 printf("\tTSF: %llu usec (%llud, %.2lld:%.2llu:%.2llu)\n",
651 tsf
, tsf
/1000/1000/60/60/24, (tsf
/1000/1000/60/60) % 24,
652 (tsf
/1000/1000/60) % 60, (tsf
/1000/1000) % 60);
654 if (bss
[NL80211_BSS_FREQUENCY
])
655 printf("\tfreq: %d\n",
656 nla_get_u32(bss
[NL80211_BSS_FREQUENCY
]));
657 if (bss
[NL80211_BSS_BEACON_INTERVAL
])
658 printf("\tbeacon interval: %d\n",
659 nla_get_u16(bss
[NL80211_BSS_BEACON_INTERVAL
]));
660 if (bss
[NL80211_BSS_CAPABILITY
]) {
661 __u16 capa
= nla_get_u16(bss
[NL80211_BSS_CAPABILITY
]);
662 printf("\tcapability:");
663 if (capa
& WLAN_CAPABILITY_ESS
)
665 if (capa
& WLAN_CAPABILITY_IBSS
)
667 if (capa
& WLAN_CAPABILITY_PRIVACY
)
669 if (capa
& WLAN_CAPABILITY_SHORT_PREAMBLE
)
670 printf(" ShortPreamble");
671 if (capa
& WLAN_CAPABILITY_PBCC
)
673 if (capa
& WLAN_CAPABILITY_CHANNEL_AGILITY
)
674 printf(" ChannelAgility");
675 if (capa
& WLAN_CAPABILITY_SPECTRUM_MGMT
)
676 printf(" SpectrumMgmt");
677 if (capa
& WLAN_CAPABILITY_QOS
)
679 if (capa
& WLAN_CAPABILITY_SHORT_SLOT_TIME
)
680 printf(" ShortSlotTime");
681 if (capa
& WLAN_CAPABILITY_APSD
)
683 if (capa
& WLAN_CAPABILITY_DSSS_OFDM
)
684 printf(" DSSS-OFDM");
685 printf(" (0x%.4x)\n", capa
);
687 if (bss
[NL80211_BSS_SIGNAL_MBM
]) {
688 int s
= nla_get_u32(bss
[NL80211_BSS_SIGNAL_MBM
]);
689 printf("\tsignal: %d.%.2d dBm\n", s
/100, s
%100);
691 if (bss
[NL80211_BSS_SIGNAL_UNSPEC
]) {
692 unsigned char s
= nla_get_u8(bss
[NL80211_BSS_SIGNAL_UNSPEC
]);
693 printf("\tsignal: %d/100\n", s
);
695 if (bss
[NL80211_BSS_INFORMATION_ELEMENTS
])
696 print_ies(nla_data(bss
[NL80211_BSS_INFORMATION_ELEMENTS
]),
697 nla_len(bss
[NL80211_BSS_INFORMATION_ELEMENTS
]),
703 static struct scan_params scan_params
;
705 static int handle_scan_dump(struct nl80211_state
*state
,
708 int argc
, char **argv
)
713 scan_params
.unknown
= false;
714 if (argc
== 1 && !strcmp(argv
[0], "-u"))
715 scan_params
.unknown
= true;
717 nl_cb_set(cb
, NL_CB_VALID
, NL_CB_CUSTOM
, print_bss_handler
,
721 COMMAND(scan
, dump
, "[-u]",
722 NL80211_CMD_GET_SCAN
, NLM_F_DUMP
, CIB_NETDEV
, handle_scan_dump
);
724 static int handle_scan_combined(struct nl80211_state
*state
,
727 int argc
, char **argv
)
730 /* static char *trig_argv[] = {
735 static char *dump_argv
[] = {
741 static const __u32 cmds
[] = {
742 NL80211_CMD_NEW_SCAN_RESULTS
,
743 NL80211_CMD_SCAN_ABORTED
,
745 int trig_argc
, dump_argc
, err
;
747 if (argc
>= 3 && !strcmp(argv
[2], "-u")) {
753 trig_argc
= 3 + (argc
- 2) + (3 - dump_argc
);
754 trig_argv
= calloc(trig_argc
, sizeof(*trig_argv
));
757 trig_argv
[0] = argv
[0];
758 trig_argv
[1] = "scan";
759 trig_argv
[2] = "trigger";
761 for (i
= 0; i
< argc
- 2 - (dump_argc
- 3); i
++)
762 trig_argv
[i
+ 3] = argv
[i
+ 2 + (dump_argc
- 3)];
763 err
= handle_cmd(state
, II_NETDEV
, trig_argc
, trig_argv
);
769 * WARNING: DO NOT COPY THIS CODE INTO YOUR APPLICATION
771 * This code has a bug, which requires creating a separate
772 * nl80211 socket to fix:
773 * It is possible for a NL80211_CMD_NEW_SCAN_RESULTS or
774 * NL80211_CMD_SCAN_ABORTED message to be sent by the kernel
775 * before (!) we listen to it, because we only start listening
776 * after we send our scan request.
778 * Doing it the other way around has a race condition as well,
779 * if you first open the events socket you may get a notification
780 * for a previous scan.
782 * The only proper way to fix this would be to listen to events
783 * before sending the command, and for the kernel to send the
784 * scan request along with the event, so that you can match up
785 * whether the scan you requested was finished or aborted (this
786 * may result in processing a scan that another application
787 * requested, but that doesn't seem to be a problem).
789 * Alas, the kernel doesn't do that (yet).
792 if (listen_events(state
, ARRAY_SIZE(cmds
), cmds
) ==
793 NL80211_CMD_SCAN_ABORTED
) {
794 printf("scan aborted!\n");
798 dump_argv
[0] = argv
[0];
799 return handle_cmd(state
, II_NETDEV
, dump_argc
, dump_argv
);
801 TOPLEVEL(scan
, "[-u] [freq <freq>*] [ssid <ssid>*|passive]", 0, 0, CIB_NETDEV
, handle_scan_combined
);