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mgmt.c
171 lines (137 loc) · 3.79 KB
/
mgmt.c
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#include <string.h>
#include <errno.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"
SECTION(mgmt);
static int seq_handler(struct nl_msg *msg, void *arg)
{
return NL_OK;
}
static int dump_mgmt_frame(struct nl_msg *msg, void *arg)
{
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (tb_msg[NL80211_ATTR_WIPHY_FREQ]) {
uint32_t freq = nla_get_u32(tb_msg[NL80211_ATTR_WIPHY_FREQ]);
printf("freq %u MHz\n", freq);
}
if (tb_msg[NL80211_ATTR_RX_SIGNAL_DBM]) {
/* nl80211_send_mgmt sends signed dBm value as u32 */
int dbm = nla_get_u32(tb_msg[NL80211_ATTR_RX_SIGNAL_DBM]);
printf("rssi %d dBm\n", dbm);
}
if (tb_msg[NL80211_ATTR_FRAME]) {
int len = nla_len(tb_msg[NL80211_ATTR_FRAME]);
uint8_t *data = nla_data(tb_msg[NL80211_ATTR_FRAME]);
iw_hexdump("mgmt", data, len);
}
return 0;
}
static int register_mgmt_frame(struct nl80211_state *state,
struct nl_msg *msg, int argc, char **argv,
enum id_input id)
{
unsigned int type;
unsigned char *match;
size_t match_len;
int ret;
if (argc < 2)
return HANDLER_RET_USAGE;
ret = sscanf(argv[0], "%x", &type);
if (ret != 1) {
printf("invalid frame type: %s\n", argv[0]);
return 2;
}
match = parse_hex(argv[1], &match_len);
if (!match) {
printf("invalid frame pattern: %s\n", argv[1]);
return 2;
}
NLA_PUT_U16(msg, NL80211_ATTR_FRAME_TYPE, type);
NLA_PUT(msg, NL80211_ATTR_FRAME_MATCH, match_len, match);
free(match);
return 0;
nla_put_failure:
free(match);
return -ENOBUFS;
}
static int handle_mgmt_reg(struct nl80211_state *state,
struct nl_msg *msg, int argc,
char **argv, enum id_input id)
{
return register_mgmt_frame(state, msg, argc, argv, id);
}
HIDDEN(mgmt, reg, "", NL80211_CMD_REGISTER_FRAME, 0, CIB_NETDEV, handle_mgmt_reg);
static int handle_mgmt_dump(struct nl80211_state *state,
struct nl_msg *msg, int argc,
char **argv, enum id_input id)
{
struct nl_cb *mgmt_cb;
char *ndev = argv[0];
int mgmt_argc = 5;
char **mgmt_argv;
unsigned int count = 0;
int err = 0;
mgmt_argv = calloc(mgmt_argc, sizeof(char*));
if (!mgmt_argv)
return -ENOMEM;
mgmt_argv[0] = ndev;
mgmt_argv[1] = "mgmt";
mgmt_argv[2] = "reg";
if (argc < 6) {
err = HANDLER_RET_USAGE;
goto out;
}
argc -= 3;
argv += 3;
while (argc >= 3) {
if (strcmp(argv[0], "frame") != 0) {
err = HANDLER_RET_USAGE;
goto out;
}
mgmt_argv[3] = argv[1];
mgmt_argv[4] = argv[2];
argc -= 3;
argv += 3;
err = handle_cmd(state, II_NETDEV, mgmt_argc, mgmt_argv);
if (err)
goto out;
}
if (argc == 2 && strcmp(argv[0], "count") == 0) {
count = 1 + atoi(argv[1]);
if (count < 1)
count = 1;
argc -= 2;
argv += 2;
} else if (argc) {
err = HANDLER_RET_USAGE;
goto out;
}
mgmt_cb = nl_cb_alloc(iw_debug ? NL_CB_DEBUG : NL_CB_DEFAULT);
if (!mgmt_cb) {
err = 1;
goto out;
}
/* need to turn off sequence number checking */
nl_cb_set(mgmt_cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, seq_handler, NULL);
nl_cb_set(mgmt_cb, NL_CB_VALID, NL_CB_CUSTOM, dump_mgmt_frame, NULL);
while (--count)
nl_recvmsgs(state->nl_sock, mgmt_cb);
nl_cb_put(mgmt_cb);
out:
free(mgmt_argv);
return err;
}
COMMAND(mgmt, dump, "frame <type as hex ab> <pattern as hex ab:cd:..> [frame <type> <pattern>]* [count <frames>]",
0, 0, CIB_NETDEV, handle_mgmt_dump,
"Register for receiving certain mgmt frames and print them.\n"
"Frames are selected by their type and pattern containing\n"
"the first several bytes of the frame that should match.\n\n"
"Example: iw dev wlan0 mgmt dump frame 40 00 frame 40 01:02 count 10\n");