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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "log.h"
#include "wifi-util.h"
int wifi_get_interface(sd_netlink *genl, int ifindex, enum nl80211_iftype *iftype, char **ssid) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *reply = NULL;
sd_genl_family family;
int r;
assert(genl);
assert(ifindex > 0);
r = sd_genl_message_new(genl, SD_GENL_NL80211, NL80211_CMD_GET_INTERFACE, &m);
if (r < 0)
return log_debug_errno(r, "Failed to create generic netlink message: %m");
r = sd_netlink_message_append_u32(m, NL80211_ATTR_IFINDEX, ifindex);
if (r < 0)
return log_debug_errno(r, "Could not append NL80211_ATTR_IFINDEX attribute: %m");
r = sd_netlink_call(genl, m, 0, &reply);
if (r == -ENODEV) {
/* For obsolete WEXT driver. */
log_debug_errno(r, "Failed to request information about wifi interface %d. "
"The device doesn't seem to have nl80211 interface. Ignoring.",
ifindex);
goto nodata;
}
if (r < 0)
return log_debug_errno(r, "Failed to request information about wifi interface %d: %m", ifindex);
if (!reply) {
log_debug_errno(r, "No reply received to request for information about wifi interface %d, ignoring.", ifindex);
goto nodata;
}
r = sd_netlink_message_get_errno(reply);
if (r < 0)
return log_debug_errno(r, "Failed to get information about wifi interface %d: %m", ifindex);
r = sd_genl_message_get_family(genl, reply, &family);
if (r < 0)
return log_debug_errno(r, "Failed to determine genl family: %m");
if (family != SD_GENL_NL80211) {
log_debug("Received message of unexpected genl family %u, ignoring.", family);
goto nodata;
}
if (iftype) {
uint32_t t;
r = sd_netlink_message_read_u32(reply, NL80211_ATTR_IFTYPE, &t);
if (r < 0)
return log_debug_errno(r, "Failed to get NL80211_ATTR_IFTYPE attribute: %m");
*iftype = t;
}
if (ssid) {
r = sd_netlink_message_read_string_strdup(reply, NL80211_ATTR_SSID, ssid);
if (r == -ENODATA)
*ssid = NULL;
else if (r < 0)
return log_debug_errno(r, "Failed to get NL80211_ATTR_SSID attribute: %m");
}
return 1;
nodata:
if (iftype)
*iftype = 0;
if (ssid)
*ssid = NULL;
return 0;
}
int wifi_get_station(sd_netlink *genl, int ifindex, struct ether_addr *bssid) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL, *reply = NULL;
sd_genl_family family;
int r;
assert(genl);
assert(ifindex > 0);
assert(bssid);
r = sd_genl_message_new(genl, SD_GENL_NL80211, NL80211_CMD_GET_STATION, &m);
if (r < 0)
return log_debug_errno(r, "Failed to create generic netlink message: %m");
r = sd_netlink_message_set_flags(m, NLM_F_REQUEST | NLM_F_ACK | NLM_F_DUMP);
if (r < 0)
return log_debug_errno(r, "Failed to set dump flag: %m");
r = sd_netlink_message_append_u32(m, NL80211_ATTR_IFINDEX, ifindex);
if (r < 0)
return log_debug_errno(r, "Could not append NL80211_ATTR_IFINDEX attribute: %m");
r = sd_netlink_call(genl, m, 0, &reply);
if (r < 0)
return log_debug_errno(r, "Failed to request information about wifi station: %m");
if (!reply) {
log_debug_errno(r, "No reply received to request for information about wifi station, ignoring.");
goto nodata;
}
r = sd_netlink_message_get_errno(reply);
if (r < 0)
return log_debug_errno(r, "Failed to get information about wifi station: %m");
r = sd_genl_message_get_family(genl, reply, &family);
if (r < 0)
return log_debug_errno(r, "Failed to determine genl family: %m");
if (family != SD_GENL_NL80211) {
log_debug("Received message of unexpected genl family %u, ignoring.", family);
goto nodata;
}
r = sd_netlink_message_read_ether_addr(reply, NL80211_ATTR_MAC, bssid);
if (r == -ENODATA)
goto nodata;
if (r < 0)
return log_debug_errno(r, "Failed to get NL80211_ATTR_MAC attribute: %m");
return 1;
nodata:
*bssid = (struct ether_addr) {};
return 0;
}
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