Hi,
I'm trying to send a 802.11 MGMT Action Frame using nl80211. However, it
always give me the error: *ERROR: -107 : Transport endpoint is not
connected*. Everything seems right to me and I have no more ideas of
what could be happening.
Another strange thing is that after the error I can not connect again
with the nl80211 until I restart the program.
Thanks,
Carlos Guimarães
Next is the code I'm using to send the frame:
int send_action_frame(const char *interface, unsigned int freq,
const uint8 *dst, const uint8 *src,
const uint8 *bssid,
const uint8 *data, size_t data_len)
{
struct nl_sock *nl_handle = NULL;
struct nl_cache *nl_cache = NULL;
struct genl_family *nl80211 = NULL;
struct nl_msg *msg;
int ret = -1;
uint8 *buf;
struct ieee80211_hdr *hdr;
uint64 cookie;
log(1, "nl80211: Send Action frame (ifindex=", interface,")");
buf = (uint8 *)calloc(24 + data_len, sizeof(uint8));
if (buf == NULL)
return ret;
memcpy(buf + 24, data, data_len);
hdr = (struct ieee80211_hdr *) buf;
hdr->frame_control = (0 << 2) | (13 << 4);
uint8* addr = (uint8 *)calloc(6, sizeof(uint8));
void *addr_bg = addr;
memset(addr, 0, 1); addr++;
memset(addr, 20, 1); addr++;
memset(addr, 108, 1); addr++;
memset(addr, 76, 1); addr++;
memset(addr, 192, 1); addr++;
memset(addr, 196, 1); addr++;
memcpy(hdr->addr1, addr_bg, 6);
memcpy(hdr->addr2, addr_bg, 6);
// memcpy(hdr->addr2, "\x00\x24\x17\xa1\x38\x2a", 6);
memcpy(hdr->addr3, addr_bg, 6);
if (connect(interface,
(void **) &nl_handle,
(void **) &nl_cache,
(void **) &nl80211) < 0) {
return -1;
}
log(1, "nl80211: connect");
msg = nlmsg_alloc();
if (!msg) {
disconnect(nl_handle);
free(buf);
return -1;
}
genlmsg_put(msg, 0, 0, genl_family_get_id(nl80211), 0, 0,
NL80211_CMD_ACTION, 0);
NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(interface));
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
NLA_PUT(msg, NL80211_ATTR_FRAME, 24 + data_len, buf);
log(1, "nl80211: message a enviar");
cookie = 0;
ret = send_and_receive(nl_handle, msg, cookie_handler, &cookie);
log(1, "nl80211: enviada");
// ret = send_and_receive(nl_handle, msg, NULL, NULL);
msg = NULL;
if (ret) {
log(1, "nl80211: Action command failed: ret=%d "
"(%s)", ret, strerror(-ret));
goto nla_put_failure;
}
log(1, "nl80211: Action TX command accepted; "
"cookie 0x%llx", (long long unsigned int) cookie);
ret = 0;
nla_put_failure:
log(1, "failure: ", ret);
free(buf);
buf = NULL;
disconnect(nl_handle);
return ret;
}
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