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3563f4c5 JB |
1 | #include <net/if.h> |
2 | #include <errno.h> | |
3 | #include <string.h> | |
4 | #include <ctype.h> | |
5 | ||
6 | #include <netlink/genl/genl.h> | |
7 | #include <netlink/genl/family.h> | |
8 | #include <netlink/genl/ctrl.h> | |
9 | #include <netlink/msg.h> | |
10 | #include <netlink/attr.h> | |
11 | ||
12 | #include "nl80211.h" | |
13 | #include "iw.h" | |
14 | ||
15 | static int handle_scan(struct nl_cb *cb, | |
16 | struct nl_msg *msg, | |
17 | int argc, char **argv) | |
18 | { | |
19 | struct nl_msg *ssids = NULL; | |
20 | int err = -ENOBUFS; | |
21 | ||
22 | ssids = nlmsg_alloc(); | |
23 | if (!ssids) | |
24 | return -ENOMEM; | |
25 | NLA_PUT(ssids, 1, 0, ""); | |
26 | nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids); | |
27 | ||
28 | err = 0; | |
29 | nla_put_failure: | |
30 | nlmsg_free(ssids); | |
31 | return err; | |
32 | } | |
33 | COMMAND(scan, trigger, NULL, | |
34 | NL80211_CMD_TRIGGER_SCAN, 0, CIB_NETDEV, handle_scan); | |
35 | ||
36 | typedef void (*printfn)(unsigned char type, unsigned char len, unsigned char *data); | |
37 | ||
38 | static void print_ssid(unsigned char type, unsigned char len, unsigned char *data) | |
39 | { | |
40 | int i; | |
41 | printf("\tSSID: "); | |
42 | for (i=0; i<len; i++) { | |
43 | if (isprint(data[i])) | |
44 | printf("%c", data[i]); | |
45 | else | |
46 | printf("\\x%.2x", data[i]); | |
47 | } | |
48 | printf("\n"); | |
49 | } | |
50 | ||
51 | static void print_supprates(unsigned char type, unsigned char len, unsigned char *data) | |
52 | { | |
53 | int i; | |
54 | ||
55 | if (type == 1) | |
56 | printf("\tSupported rates: "); | |
57 | else | |
58 | printf("\tExtended supported rates: "); | |
59 | ||
60 | for (i=0; i<len; i++) { | |
61 | int r = data[i] & 0x7f; | |
62 | printf("%d.%d%s ", r/2, 5*(r&1), data[i] & 0x80 ? "*":""); | |
63 | } | |
64 | printf("\n"); | |
65 | } | |
66 | ||
67 | static void print_ds(unsigned char type, unsigned char len, unsigned char *data) | |
68 | { | |
69 | printf("\tDS Parameter set: channel %d\n", data[0]); | |
70 | } | |
71 | ||
72 | static void print_ign(unsigned char type, unsigned char len, unsigned char *data) | |
73 | { | |
74 | /* ignore for now, not too useful */ | |
75 | } | |
76 | ||
77 | static void print_vendor(unsigned char type, unsigned char len, unsigned char *data) | |
78 | { | |
79 | int i; | |
80 | ||
81 | printf("\tVendor specific: OUI %.2x:%.2x:%.2x, data: ", | |
82 | data[0], data[1], data[2]); | |
83 | for (i=3; i<len; i++) | |
84 | printf("\\x%.2x", data[i]); | |
85 | printf("\n"); | |
86 | } | |
87 | ||
88 | static const printfn ieprinters[] = { | |
89 | [0] = print_ssid, | |
90 | [1] = print_supprates, | |
91 | [3] = print_ds, | |
92 | [5] = print_ign, | |
93 | [50] = print_supprates, | |
94 | [221] = print_vendor, | |
95 | }; | |
96 | #define NUMPRINTERS (sizeof(ieprinters)/sizeof(ieprinters[0])) | |
97 | ||
98 | static void print_ies(unsigned char *ie, int ielen) | |
99 | { | |
100 | while (ielen >= 2 && ielen >= ie[1]) { | |
101 | if (ie[0] < NUMPRINTERS && ieprinters[ie[0]]) { | |
102 | ieprinters[ie[0]](ie[0], ie[1], ie + 2); | |
103 | } else { | |
104 | int i; | |
105 | ||
106 | printf("\tUnknown IE (%d): ", ie[0]); | |
107 | for (i=0; i<ie[1]; i++) | |
108 | printf("\\x%.2x", ie[2+i]); | |
109 | printf("\n"); | |
110 | } | |
111 | ielen -= ie[1] + 2; | |
112 | ie += ie[1] + 2; | |
113 | } | |
114 | } | |
115 | ||
116 | static int print_bss_handler(struct nl_msg *msg, void *arg) | |
117 | { | |
118 | struct nlattr *tb[NL80211_ATTR_MAX + 1]; | |
119 | struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg)); | |
120 | struct nlattr *bss[NL80211_BSS_MAX + 1]; | |
121 | char mac_addr[20], dev[20]; | |
122 | static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = { | |
123 | [NL80211_BSS_TSF] = { .type = NLA_U64 }, | |
124 | [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 }, | |
125 | [NL80211_BSS_BSSID] = { }, | |
126 | [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 }, | |
127 | [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 }, | |
128 | [NL80211_BSS_INFORMATION_ELEMENTS] = { }, | |
129 | }; | |
130 | ||
131 | nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), | |
132 | genlmsg_attrlen(gnlh, 0), NULL); | |
133 | ||
134 | if (!tb[NL80211_ATTR_BSS]) { | |
135 | fprintf(stderr, "bss info missing!"); | |
136 | return NL_SKIP; | |
137 | } | |
138 | if (nla_parse_nested(bss, NL80211_BSS_MAX, | |
139 | tb[NL80211_ATTR_BSS], | |
140 | bss_policy)) { | |
141 | fprintf(stderr, "failed to parse nested attributes!"); | |
142 | return NL_SKIP; | |
143 | } | |
144 | ||
145 | if (!bss[NL80211_BSS_BSSID]) | |
146 | return NL_SKIP; | |
147 | ||
148 | mac_addr_n2a(mac_addr, nla_data(bss[NL80211_BSS_BSSID])); | |
149 | if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev); | |
150 | printf("BSS %s (on %s)\n", mac_addr, dev); | |
151 | ||
152 | if (bss[NL80211_BSS_TSF]) | |
153 | printf("\tTSF: %llu usec\n", | |
154 | (unsigned long long)nla_get_u64(bss[NL80211_BSS_TSF])); | |
155 | if (bss[NL80211_BSS_FREQUENCY]) | |
156 | printf("\tfreq: %d\n", | |
157 | nla_get_u32(bss[NL80211_BSS_FREQUENCY])); | |
158 | if (bss[NL80211_BSS_BEACON_INTERVAL]) | |
159 | printf("\tbeacon interval: %d\n", | |
160 | nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL])); | |
161 | if (bss[NL80211_BSS_CAPABILITY]) | |
162 | printf("\tcapability: 0x%.4x\n", | |
163 | nla_get_u16(bss[NL80211_BSS_CAPABILITY])); | |
164 | if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) | |
165 | print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]), | |
166 | nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS])); | |
167 | ||
168 | return NL_SKIP; | |
169 | } | |
170 | ||
171 | ||
172 | ||
173 | static int handle_scan_dump(struct nl_cb *cb, | |
174 | struct nl_msg *msg, | |
175 | int argc, char **argv) | |
176 | { | |
177 | nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_bss_handler, NULL); | |
178 | return 0; | |
179 | } | |
180 | COMMAND(scan, dump, NULL, | |
181 | NL80211_CMD_GET_SCAN, NLM_F_DUMP, CIB_NETDEV, handle_scan_dump); |