1 #include <net/if.h> 2 #include <errno.h> 3 #include <string.h> 4 #include <ctype.h> 5 #include <stdbool.h> 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 16 struct link_result { 17 uint8_t bssid[8]; 18 bool link_found; 19 bool anything_found; 20 }; 21 22 static struct link_result lr = { .link_found = false }; 23 24 static int link_bss_handler(struct nl_msg *msg, void *arg) 25 { 26 struct nlattr *tb[NL80211_ATTR_MAX + 1]; 27 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg)); 28 struct nlattr *bss[NL80211_BSS_MAX + 1]; 29 static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = { 30 [NL80211_BSS_TSF] = { .type = NLA_U64 }, 31 [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 }, 32 [NL80211_BSS_BSSID] = { }, 33 [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 }, 34 [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 }, 35 [NL80211_BSS_INFORMATION_ELEMENTS] = { }, 36 [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 }, 37 [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 }, 38 [NL80211_BSS_STATUS] = { .type = NLA_U32 }, 39 }; 40 struct link_result *result = arg; 41 char mac_addr[20], dev[20]; 42 43 nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), 44 genlmsg_attrlen(gnlh, 0), NULL); 45 46 if (!tb[NL80211_ATTR_BSS]) { 47 fprintf(stderr, "bss info missing!\n"); 48 return NL_SKIP; 49 } 50 if (nla_parse_nested(bss, NL80211_BSS_MAX, 51 tb[NL80211_ATTR_BSS], 52 bss_policy)) { 53 fprintf(stderr, "failed to parse nested attributes!\n"); 54 return NL_SKIP; 55 } 56 57 if (!bss[NL80211_BSS_BSSID]) 58 return NL_SKIP; 59 60 if (!bss[NL80211_BSS_STATUS]) 61 return NL_SKIP; 62 63 mac_addr_n2a(mac_addr, nla_data(bss[NL80211_BSS_BSSID])); 64 if_indextoname(nla_get_u32(tb[NL80211_ATTR_IFINDEX]), dev); 65 66 switch (nla_get_u32(bss[NL80211_BSS_STATUS])) { 67 case NL80211_BSS_STATUS_ASSOCIATED: 68 printf("Connected to %s (on %s)\n", mac_addr, dev); 69 break; 70 case NL80211_BSS_STATUS_AUTHENTICATED: 71 printf("Authenticated with %s (on %s)\n", mac_addr, dev); 72 return NL_SKIP; 73 case NL80211_BSS_STATUS_IBSS_JOINED: 74 printf("Joined IBSS %s (on %s)\n", mac_addr, dev); 75 break; 76 default: 77 return NL_SKIP; 78 } 79 80 result->anything_found = true; 81 82 if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) 83 print_ies(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]), 84 nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]), 85 false, PRINT_LINK); 86 87 if (bss[NL80211_BSS_FREQUENCY]) 88 printf("\tfreq: %d\n", 89 nla_get_u32(bss[NL80211_BSS_FREQUENCY])); 90 91 if (nla_get_u32(bss[NL80211_BSS_STATUS]) != NL80211_BSS_STATUS_ASSOCIATED) 92 return NL_SKIP; 93 94 /* only in the assoc case do we want more info from station get */ 95 result->link_found = true; 96 memcpy(result->bssid, nla_data(bss[NL80211_BSS_BSSID]), 6); 97 return NL_SKIP; 98 } 99 100 static int handle_scan_for_link(struct nl80211_state *state, 101 struct nl_cb *cb, 102 struct nl_msg *msg, 103 int argc, char **argv, 104 enum id_input id) 105 { 106 if (argc > 0) 107 return 1; 108 109 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, link_bss_handler, &lr); 110 return 0; 111 } 112 113 static int print_link_sta(struct nl_msg *msg, void *arg) 114 { 115 struct nlattr *tb[NL80211_ATTR_MAX + 1]; 116 struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg)); 117 struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1]; 118 struct nlattr *binfo[NL80211_STA_BSS_PARAM_MAX + 1]; 119 static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = { 120 [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 }, 121 [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 }, 122 [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 }, 123 [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 }, 124 [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 }, 125 [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 }, 126 [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED }, 127 [NL80211_STA_INFO_LLID] = { .type = NLA_U16 }, 128 [NL80211_STA_INFO_PLID] = { .type = NLA_U16 }, 129 [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 }, 130 }; 131 static struct nla_policy bss_policy[NL80211_STA_BSS_PARAM_MAX + 1] = { 132 [NL80211_STA_BSS_PARAM_CTS_PROT] = { .type = NLA_FLAG }, 133 [NL80211_STA_BSS_PARAM_SHORT_PREAMBLE] = { .type = NLA_FLAG }, 134 [NL80211_STA_BSS_PARAM_SHORT_SLOT_TIME] = { .type = NLA_FLAG }, 135 [NL80211_STA_BSS_PARAM_DTIM_PERIOD] = { .type = NLA_U8 }, 136 [NL80211_STA_BSS_PARAM_BEACON_INTERVAL] = { .type = NLA_U16 }, 137 }; 138 139 nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), 140 genlmsg_attrlen(gnlh, 0), NULL); 141 142 if (!tb[NL80211_ATTR_STA_INFO]) { 143 fprintf(stderr, "sta stats missing!\n"); 144 return NL_SKIP; 145 } 146 if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, 147 tb[NL80211_ATTR_STA_INFO], 148 stats_policy)) { 149 fprintf(stderr, "failed to parse nested attributes!\n"); 150 return NL_SKIP; 151 } 152 153 if (sinfo[NL80211_STA_INFO_RX_BYTES] && sinfo[NL80211_STA_INFO_RX_PACKETS]) 154 printf("\tRX: %u bytes (%u packets)\n", 155 nla_get_u32(sinfo[NL80211_STA_INFO_RX_BYTES]), 156 nla_get_u32(sinfo[NL80211_STA_INFO_RX_PACKETS])); 157 if (sinfo[NL80211_STA_INFO_TX_BYTES] && sinfo[NL80211_STA_INFO_TX_PACKETS]) 158 printf("\tTX: %u bytes (%u packets)\n", 159 nla_get_u32(sinfo[NL80211_STA_INFO_TX_BYTES]), 160 nla_get_u32(sinfo[NL80211_STA_INFO_TX_PACKETS])); 161 if (sinfo[NL80211_STA_INFO_SIGNAL]) 162 printf("\tsignal: %d dBm\n", 163 (int8_t)nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL])); 164 165 if (sinfo[NL80211_STA_INFO_TX_BITRATE]) { 166 char buf[100]; 167 168 parse_bitrate(sinfo[NL80211_STA_INFO_TX_BITRATE], buf, sizeof(buf)); 169 printf("\ttx bitrate: %s\n", buf); 170 } 171 172 if (sinfo[NL80211_STA_INFO_BSS_PARAM]) { 173 if (nla_parse_nested(binfo, NL80211_STA_BSS_PARAM_MAX, 174 sinfo[NL80211_STA_INFO_BSS_PARAM], 175 bss_policy)) { 176 fprintf(stderr, "failed to parse nested bss parameters!\n"); 177 } else { 178 char *delim = ""; 179 printf("\n\tbss flags:\t"); 180 if (binfo[NL80211_STA_BSS_PARAM_CTS_PROT]) { 181 printf("CTS-protection"); 182 delim = " "; 183 } 184 if (binfo[NL80211_STA_BSS_PARAM_SHORT_PREAMBLE]) { 185 printf("%sshort-preamble", delim); 186 delim = " "; 187 } 188 if (binfo[NL80211_STA_BSS_PARAM_SHORT_SLOT_TIME]) 189 printf("%sshort-slot-time", delim); 190 printf("\n\tdtim period:\t%d", 191 nla_get_u8(binfo[NL80211_STA_BSS_PARAM_DTIM_PERIOD])); 192 printf("\n\tbeacon int:\t%d", 193 nla_get_u16(binfo[NL80211_STA_BSS_PARAM_BEACON_INTERVAL])); 194 printf("\n"); 195 } 196 } 197 198 return NL_SKIP; 199 } 200 201 static int handle_link_sta(struct nl80211_state *state, 202 struct nl_cb *cb, 203 struct nl_msg *msg, 204 int argc, char **argv, 205 enum id_input id) 206 { 207 unsigned char mac_addr[ETH_ALEN]; 208 209 if (argc < 1) 210 return 1; 211 212 if (mac_addr_a2n(mac_addr, argv[0])) { 213 fprintf(stderr, "invalid mac address\n"); 214 return 2; 215 } 216 217 argc--; 218 argv++; 219 220 if (argc) 221 return 1; 222 223 NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, mac_addr); 224 225 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, print_link_sta, NULL); 226 227 return 0; 228 nla_put_failure: 229 return -ENOBUFS; 230 } 231 232 static int handle_link(struct nl80211_state *state, struct nl_cb *cb, 233 struct nl_msg *msg, int argc, char **argv, 234 enum id_input id) 235 { 236 char *link_argv[] = { 237 NULL, 238 "link", 239 "get_bss", 240 NULL, 241 }; 242 char *station_argv[] = { 243 NULL, 244 "link", 245 "get_sta", 246 NULL, 247 NULL, 248 }; 249 char bssid_buf[3*6]; 250 int err; 251 252 link_argv[0] = argv[0]; 253 err = handle_cmd(state, id, 3, link_argv); 254 if (err) 255 return err; 256 257 if (!lr.link_found) { 258 if (!lr.anything_found) 259 printf("Not connected.\n"); 260 return 0; 261 } 262 263 mac_addr_n2a(bssid_buf, lr.bssid); 264 bssid_buf[17] = '\0'; 265 266 station_argv[0] = argv[0]; 267 station_argv[3] = bssid_buf; 268 return handle_cmd(state, id, 4, station_argv); 269 } 270 TOPLEVEL(link, NULL, 0, 0, CIB_NETDEV, handle_link, 271 "Print information about the current link, if any."); 272 HIDDEN(link, get_sta, "", NL80211_CMD_GET_STATION, 0, 273 CIB_NETDEV, handle_link_sta); 274 HIDDEN(link, get_bss, NULL, NL80211_CMD_GET_SCAN, NLM_F_DUMP, 275 CIB_NETDEV, handle_scan_for_link); 276
