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23b9923eeba13bdba51b601f2c5c7e4f20b8710a
Waybar/src/modules/network.cpp
Anthony PERARD 23b9923eeb network: Parse whole RTM_NEWROUTE msg before interpreting it 
The check to figure out if we have the default route should be after
the for loop that parses the route attributes, to avoid acting on
incomplete information. We are going to use more fields from the
message.
2021-06-05 16:51:35 +01:00

862 lines
27 KiB
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#include "modules/network.hpp"
#include <spdlog/spdlog.h>
#include <sys/eventfd.h>
#include <fstream>
#include <cassert>
#include <optional>
#include "util/format.hpp"
#ifdef WANT_RFKILL
#include "util/rfkill.hpp"
#endif
namespace {
using namespace waybar::util;
constexpr const char *NETSTAT_FILE =
"/proc/net/netstat"; // std::ifstream does not take std::string_view as param
constexpr std::string_view BANDWIDTH_CATEGORY = "IpExt";
constexpr std::string_view BANDWIDTH_DOWN_TOTAL_KEY = "InOctets";
constexpr std::string_view BANDWIDTH_UP_TOTAL_KEY = "OutOctets";
std::ifstream netstat(NETSTAT_FILE);
std::optional<unsigned long long> read_netstat(std::string_view category, std::string_view key) {
if (!netstat) {
spdlog::warn("Failed to open netstat file {}", NETSTAT_FILE);
return {};
}
netstat.seekg(std::ios_base::beg);
// finding corresponding line (category)
// looks into the file for the first line starting by the 'category' string
auto starts_with = [](const std::string &str, std::string_view start) {
return start == std::string_view{str.data(), std::min(str.size(), start.size())};
};
std::string read;
while (std::getline(netstat, read) && !starts_with(read, category))
;
if (!starts_with(read, category)) {
spdlog::warn("Category '{}' not found in netstat file {}", category, NETSTAT_FILE);
return {};
}
// finding corresponding column (key)
// looks into the fetched line for the first word (space separated) equal to 'key'
int index = 0;
auto r_it = read.begin();
auto k_it = key.begin();
while (k_it != key.end() && r_it != read.end()) {
if (*r_it != *k_it) {
r_it = std::find(r_it, read.end(), ' ');
if (r_it != read.end()) {
++r_it;
}
k_it = key.begin();
++index;
} else {
++r_it;
++k_it;
}
}
if (r_it == read.end() && k_it != key.end()) {
spdlog::warn(
"Key '{}' not found in category '{}' of netstat file {}", key, category, NETSTAT_FILE);
return {};
}
// finally accessing value
// accesses the line right under the fetched one
std::getline(netstat, read);
assert(starts_with(read, category));
std::istringstream iss(read);
while (index--) {
std::getline(iss, read, ' ');
}
unsigned long long value;
iss >> value;
return value;
}
} // namespace
waybar::modules::Network::Network(const std::string &id, const Json::Value &config)
: ALabel(config, "network", id, "{ifname}", 60),
ifid_(-1),
family_(config["family"] == "ipv6" ? AF_INET6 : AF_INET),
efd_(-1),
ev_fd_(-1),
want_route_dump_(false),
want_link_dump_(false),
want_addr_dump_(false),
dump_in_progress_(false),
cidr_(0),
signal_strength_dbm_(0),
signal_strength_(0),
#ifdef WANT_RFKILL
rfkill_{RFKILL_TYPE_WLAN},
#endif
frequency_(0) {
// Start with some "text" in the module's label_, update() will then
// update it. Since the text should be different, update() will be able
// to show or hide the event_box_. This is to work around the case where
// the module start with no text, but the the event_box_ is shown.
label_.set_markup("<s></s>");
auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
if (down_octets) {
bandwidth_down_total_ = *down_octets;
} else {
bandwidth_down_total_ = 0;
}
if (up_octets) {
bandwidth_up_total_ = *up_octets;
} else {
bandwidth_up_total_ = 0;
}
if (!config_["interface"].isString()) {
// "interface" isn't configure, then try to guess the external
// interface currently used for internet.
want_route_dump_ = true;
} else {
// Look for an interface that match "interface"
// and then find the address associated with it.
want_link_dump_ = true;
want_addr_dump_ = true;
}
createEventSocket();
createInfoSocket();
dp.emit();
// Ask for a dump of interfaces and then addresses to populate our
// information. First the interface dump, and once done, the callback
// will be called again which will ask for addresses dump.
askForStateDump();
worker();
}
waybar::modules::Network::~Network() {
if (ev_fd_ > -1) {
close(ev_fd_);
}
if (efd_ > -1) {
close(efd_);
}
if (ev_sock_ != nullptr) {
nl_socket_drop_membership(ev_sock_, RTNLGRP_LINK);
if (family_ == AF_INET) {
nl_socket_drop_membership(ev_sock_, RTNLGRP_IPV4_IFADDR);
} else {
nl_socket_drop_membership(ev_sock_, RTNLGRP_IPV6_IFADDR);
}
nl_close(ev_sock_);
nl_socket_free(ev_sock_);
}
if (sock_ != nullptr) {
nl_close(sock_);
nl_socket_free(sock_);
}
}
void waybar::modules::Network::createEventSocket() {
ev_sock_ = nl_socket_alloc();
nl_socket_disable_seq_check(ev_sock_);
nl_socket_modify_cb(ev_sock_, NL_CB_VALID, NL_CB_CUSTOM, handleEvents, this);
nl_socket_modify_cb(ev_sock_, NL_CB_FINISH, NL_CB_CUSTOM, handleEventsDone, this);
auto groups = RTMGRP_LINK | (family_ == AF_INET ? RTMGRP_IPV4_IFADDR : RTMGRP_IPV6_IFADDR);
nl_join_groups(ev_sock_, groups); // Deprecated
if (nl_connect(ev_sock_, NETLINK_ROUTE) != 0) {
throw std::runtime_error("Can't connect network socket");
}
if (nl_socket_set_nonblocking(ev_sock_)) {
throw std::runtime_error("Can't set non-blocking on network socket");
}
nl_socket_add_membership(ev_sock_, RTNLGRP_LINK);
if (family_ == AF_INET) {
nl_socket_add_membership(ev_sock_, RTNLGRP_IPV4_IFADDR);
} else {
nl_socket_add_membership(ev_sock_, RTNLGRP_IPV6_IFADDR);
}
if (!config_["interface"].isString()) {
if (family_ == AF_INET) {
nl_socket_add_membership(ev_sock_, RTNLGRP_IPV4_ROUTE);
} else {
nl_socket_add_membership(ev_sock_, RTNLGRP_IPV6_ROUTE);
}
}
efd_ = epoll_create1(EPOLL_CLOEXEC);
if (efd_ < 0) {
throw std::runtime_error("Can't create epoll");
}
{
ev_fd_ = eventfd(0, EFD_NONBLOCK);
struct epoll_event event;
memset(&event, 0, sizeof(event));
event.events = EPOLLIN | EPOLLET;
event.data.fd = ev_fd_;
if (epoll_ctl(efd_, EPOLL_CTL_ADD, ev_fd_, &event) == -1) {
throw std::runtime_error("Can't add epoll event");
}
}
{
auto fd = nl_socket_get_fd(ev_sock_);
struct epoll_event event;
memset(&event, 0, sizeof(event));
event.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
event.data.fd = fd;
if (epoll_ctl(efd_, EPOLL_CTL_ADD, fd, &event) == -1) {
throw std::runtime_error("Can't add epoll event");
}
}
}
void waybar::modules::Network::createInfoSocket() {
sock_ = nl_socket_alloc();
if (genl_connect(sock_) != 0) {
throw std::runtime_error("Can't connect to netlink socket");
}
if (nl_socket_modify_cb(sock_, NL_CB_VALID, NL_CB_CUSTOM, handleScan, this) < 0) {
throw std::runtime_error("Can't set callback");
}
nl80211_id_ = genl_ctrl_resolve(sock_, "nl80211");
if (nl80211_id_ < 0) {
spdlog::warn("Can't resolve nl80211 interface");
}
}
void waybar::modules::Network::worker() {
// update via here not working
thread_timer_ = [this] {
{
std::lock_guard<std::mutex> lock(mutex_);
if (ifid_ > 0) {
getInfo();
dp.emit();
}
}
thread_timer_.sleep_for(interval_);
};
#ifdef WANT_RFKILL
rfkill_.on_update.connect([this](auto &) {
/* If we are here, it's likely that the network thread already holds the mutex and will be
* holding it for a next few seconds.
* Let's delegate the update to the timer thread instead of blocking the main thread.
*/
thread_timer_.wake_up();
});
#else
spdlog::warn("Waybar has been built without rfkill support.");
#endif
thread_ = [this] {
std::array<struct epoll_event, EPOLL_MAX> events{};
int ec = epoll_wait(efd_, events.data(), EPOLL_MAX, -1);
if (ec > 0) {
for (auto i = 0; i < ec; i++) {
if (events[i].data.fd == nl_socket_get_fd(ev_sock_)) {
int rc = 0;
// Read as many message as possible, until the socket blocks
while (true) {
errno = 0;
rc = nl_recvmsgs_default(ev_sock_);
if (rc == -NLE_AGAIN || errno == EAGAIN) {
rc = 0;
break;
}
}
if (rc < 0) {
spdlog::error("nl_recvmsgs_default error: {}", nl_geterror(-rc));
thread_.stop();
break;
}
} else {
thread_.stop();
break;
}
}
}
};
}
const std::string waybar::modules::Network::getNetworkState() const {
if (ifid_ == -1) {
#ifdef WANT_RFKILL
if (rfkill_.getState())
return "disabled";
#endif
return "disconnected";
}
if (!carrier_) return "disconnected";
if (ipaddr_.empty()) return "linked";
if (essid_.empty()) return "ethernet";
return "wifi";
}
auto waybar::modules::Network::update() -> void {
std::lock_guard<std::mutex> lock(mutex_);
std::string tooltip_format;
auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
unsigned long long bandwidth_down = 0;
if (down_octets) {
bandwidth_down = *down_octets - bandwidth_down_total_;
bandwidth_down_total_ = *down_octets;
}
unsigned long long bandwidth_up = 0;
if (up_octets) {
bandwidth_up = *up_octets - bandwidth_up_total_;
bandwidth_up_total_ = *up_octets;
}
if (!alt_) {
auto state = getNetworkState();
if (!state_.empty() && label_.get_style_context()->has_class(state_)) {
label_.get_style_context()->remove_class(state_);
}
if (config_["format-" + state].isString()) {
default_format_ = config_["format-" + state].asString();
}
if (config_["tooltip-format-" + state].isString()) {
tooltip_format = config_["tooltip-format-" + state].asString();
}
if (!label_.get_style_context()->has_class(state)) {
label_.get_style_context()->add_class(state);
}
format_ = default_format_;
state_ = state;
}
getState(signal_strength_);
auto text = fmt::format(
format_,
fmt::arg("essid", essid_),
fmt::arg("signaldBm", signal_strength_dbm_),
fmt::arg("signalStrength", signal_strength_),
fmt::arg("ifname", ifname_),
fmt::arg("netmask", netmask_),
fmt::arg("ipaddr", ipaddr_),
fmt::arg("cidr", cidr_),
fmt::arg("frequency", frequency_),
fmt::arg("icon", getIcon(signal_strength_, state_)),
fmt::arg("bandwidthDownBits", pow_format(bandwidth_down * 8ull / interval_.count(), "b/s")),
fmt::arg("bandwidthUpBits", pow_format(bandwidth_up * 8ull / interval_.count(), "b/s")),
fmt::arg("bandwidthDownOctets", pow_format(bandwidth_down / interval_.count(), "o/s")),
fmt::arg("bandwidthUpOctets", pow_format(bandwidth_up / interval_.count(), "o/s")));
if (text.compare(label_.get_label()) != 0) {
label_.set_markup(text);
if (text.empty()) {
event_box_.hide();
} else {
event_box_.show();
}
}
if (tooltipEnabled()) {
if (tooltip_format.empty() && config_["tooltip-format"].isString()) {
tooltip_format = config_["tooltip-format"].asString();
}
if (!tooltip_format.empty()) {
auto tooltip_text = fmt::format(
tooltip_format,
fmt::arg("essid", essid_),
fmt::arg("signaldBm", signal_strength_dbm_),
fmt::arg("signalStrength", signal_strength_),
fmt::arg("ifname", ifname_),
fmt::arg("netmask", netmask_),
fmt::arg("ipaddr", ipaddr_),
fmt::arg("cidr", cidr_),
fmt::arg("frequency", frequency_),
fmt::arg("icon", getIcon(signal_strength_, state_)),
fmt::arg("bandwidthDownBits",
pow_format(bandwidth_down * 8ull / interval_.count(), "b/s")),
fmt::arg("bandwidthUpBits", pow_format(bandwidth_up * 8ull / interval_.count(), "b/s")),
fmt::arg("bandwidthDownOctets", pow_format(bandwidth_down / interval_.count(), "o/s")),
fmt::arg("bandwidthUpOctets", pow_format(bandwidth_up / interval_.count(), "o/s")));
if (label_.get_tooltip_text() != tooltip_text) {
label_.set_tooltip_text(tooltip_text);
}
} else if (label_.get_tooltip_text() != text) {
label_.set_tooltip_text(text);
}
}
// Call parent update
ALabel::update();
}
bool waybar::modules::Network::checkInterface(std::string name) {
if (config_["interface"].isString()) {
return config_["interface"].asString() == name ||
wildcardMatch(config_["interface"].asString(), name);
}
return false;
}
void waybar::modules::Network::clearIface() {
ifid_ = -1;
essid_.clear();
ipaddr_.clear();
netmask_.clear();
carrier_ = false;
cidr_ = 0;
signal_strength_dbm_ = 0;
signal_strength_ = 0;
frequency_ = 0;
}
int waybar::modules::Network::handleEvents(struct nl_msg *msg, void *data) {
auto net = static_cast<waybar::modules::Network *>(data);
std::lock_guard<std::mutex> lock(net->mutex_);
auto nh = nlmsg_hdr(msg);
bool is_del_event = false;
switch (nh->nlmsg_type) {
case RTM_DELLINK:
is_del_event = true;
case RTM_NEWLINK: {
struct ifinfomsg *ifi = static_cast<struct ifinfomsg *>(NLMSG_DATA(nh));
ssize_t attrlen = IFLA_PAYLOAD(nh);
struct rtattr *ifla = IFLA_RTA(ifi);
const char *ifname = NULL;
size_t ifname_len = 0;
std::optional<bool> carrier;
if (net->ifid_ != -1 && ifi->ifi_index != net->ifid_) {
return NL_OK;
}
for (; RTA_OK(ifla, attrlen); ifla = RTA_NEXT(ifla, attrlen)) {
switch (ifla->rta_type) {
case IFLA_IFNAME:
ifname = static_cast<const char *>(RTA_DATA(ifla));
ifname_len = RTA_PAYLOAD(ifla) - 1; // minus \0
break;
case IFLA_CARRIER: {
carrier = *(char*)RTA_DATA(ifla) == 1;
break;
}
}
}
if (!is_del_event && ifi->ifi_index == net->ifid_) {
// Update inferface information
if (net->ifname_.empty() && ifname != NULL) {
std::string new_ifname (ifname, ifname_len);
net->ifname_ = new_ifname;
}
if (carrier.has_value()) {
if (net->carrier_ != *carrier) {
if (*carrier) {
// Ask for WiFi information
net->thread_timer_.wake_up();
} else {
// clear state related to WiFi connection
net->essid_.clear();
net->signal_strength_dbm_ = 0;
net->signal_strength_ = 0;
net->frequency_ = 0;
}
}
net->carrier_ = carrier.value();
}
} else if (!is_del_event && net->ifid_ == -1) {
// Checking if it's an interface we care about.
std::string new_ifname (ifname, ifname_len);
if (net->checkInterface(new_ifname)) {
spdlog::debug("network: selecting new interface {}/{}", new_ifname, ifi->ifi_index);
net->ifname_ = new_ifname;
net->ifid_ = ifi->ifi_index;
if (carrier.has_value()) {
net->carrier_ = carrier.value();
}
net->thread_timer_.wake_up();
/* An address for this new interface should be received via an
* RTM_NEWADDR event either because we ask for a dump of both links
* and addrs, or because this interface has just been created and
* the addr will be sent after the RTM_NEWLINK event.
* So we don't need to do anything. */
}
} else if (is_del_event && net->ifid_ >= 0) {
// Our interface has been deleted, start looking/waiting for one we care.
spdlog::debug("network: interface {}/{} deleted", net->ifname_, net->ifid_);
net->clearIface();
net->dp.emit();
}
break;
}
case RTM_DELADDR:
is_del_event = true;
case RTM_NEWADDR: {
struct ifaddrmsg *ifa = static_cast<struct ifaddrmsg *>(NLMSG_DATA(nh));
ssize_t attrlen = IFA_PAYLOAD(nh);
struct rtattr *ifa_rta = IFA_RTA(ifa);
if ((int)ifa->ifa_index != net->ifid_) {
return NL_OK;
}
if (ifa->ifa_family != net->family_) {
return NL_OK;
}
// We ignore address mark as scope for the link or host,
// which should leave scope global addresses.
if (ifa->ifa_scope >= RT_SCOPE_LINK) {
return NL_OK;
}
for (; RTA_OK(ifa_rta, attrlen); ifa_rta = RTA_NEXT(ifa_rta, attrlen)) {
switch (ifa_rta->rta_type) {
case IFA_ADDRESS: {
char ipaddr[INET6_ADDRSTRLEN];
if (!is_del_event) {
net->ipaddr_ = inet_ntop(ifa->ifa_family, RTA_DATA(ifa_rta),
ipaddr, sizeof (ipaddr));
net->cidr_ = ifa->ifa_prefixlen;
switch (ifa->ifa_family) {
case AF_INET: {
struct in_addr netmask;
netmask.s_addr = htonl(~0 << (32 - ifa->ifa_prefixlen));
net->netmask_ = inet_ntop(ifa->ifa_family, &netmask,
ipaddr, sizeof (ipaddr));
}
case AF_INET6: {
struct in6_addr netmask;
for (int i = 0; i < 16; i++) {
int v = (i + 1) * 8 - ifa->ifa_prefixlen;
if (v < 0) v = 0;
if (v > 8) v = 8;
netmask.s6_addr[i] = ~0 << v;
}
net->netmask_ = inet_ntop(ifa->ifa_family, &netmask,
ipaddr, sizeof (ipaddr));
}
}
spdlog::debug("network: {}, new addr {}/{}", net->ifname_, net->ipaddr_, net->cidr_);
} else {
net->ipaddr_.clear();
net->cidr_ = 0;
net->netmask_.clear();
spdlog::debug("network: {} addr deleted {}/{}",
net->ifname_,
inet_ntop(ifa->ifa_family, RTA_DATA(ifa_rta),
ipaddr, sizeof (ipaddr)),
ifa->ifa_prefixlen);
}
net->dp.emit();
break;
}
}
}
break;
}
case RTM_DELROUTE:
is_del_event = true;
case RTM_NEWROUTE: {
// Based on https://gist.github.com/Yawning/c70d804d4b8ae78cc698
// to find the interface used to reach the outside world
struct rtmsg *rtm = static_cast<struct rtmsg *>(NLMSG_DATA(nh));
ssize_t attrlen = RTM_PAYLOAD(nh);
struct rtattr *attr = RTM_RTA(rtm);
bool has_gateway = false;
bool has_destination = false;
int temp_idx = -1;
/* If we found the correct answer, skip parsing the attributes. */
if (!is_del_event && net->ifid_ != -1) {
return NL_OK;
}
/* Find the message(s) concerting the main routing table, each message
* corresponds to a single routing table entry.
*/
if (rtm->rtm_table != RT_TABLE_MAIN) {
return NL_OK;
}
/* Parse all the attributes for a single routing table entry. */
for (; RTA_OK(attr, attrlen); attr = RTA_NEXT(attr, attrlen)) {
/* Determine if this routing table entry corresponds to the default
* route by seeing if it has a gateway, and if a destination addr is
* set, that it is all 0s.
*/
switch(attr->rta_type) {
case RTA_GATEWAY:
/* The gateway of the route.
*
* If someone every needs to figure out the gateway address as well,
* it's here as the attribute payload.
*/
has_gateway = true;
break;
case RTA_DST: {
/* The destination address.
* Should be either missing, or maybe all 0s. Accept both.
*/
const uint32_t nr_zeroes = (net->family_ == AF_INET) ? 4 : 16;
unsigned char c = 0;
size_t dstlen = RTA_PAYLOAD(attr);
if (dstlen != nr_zeroes) {
break;
}
for (uint32_t i = 0; i < dstlen; i += 1) {
c |= *((unsigned char *)RTA_DATA(attr) + i);
}
has_destination = (c == 0);
break;
}
case RTA_OIF:
/* The output interface index. */
temp_idx = *static_cast<int *>(RTA_DATA(attr));
break;
default:
break;
}
}
// Check if we have a default route.
if (has_gateway && !has_destination && temp_idx != -1) {
if (!is_del_event) {
net->ifid_ = temp_idx;
spdlog::debug("network: new default route via if{}", temp_idx);
/* Ask ifname associated with temp_idx as well as carrier status */
struct ifinfomsg ifinfo_hdr = {
.ifi_family = AF_UNSPEC,
.ifi_index = temp_idx,
};
int err;
err = nl_send_simple(net->ev_sock_, RTM_GETLINK, NLM_F_REQUEST,
&ifinfo_hdr, sizeof (ifinfo_hdr));
if (err < 0) {
spdlog::error("network: failed to ask link info: {}", err);
/* Ask for a dump of all links instead */
net->want_link_dump_ = true;
}
/* Also ask for the address. Asking for a addresses of a specific
* interface doesn't seems to work so ask for a dump of all
* addresses. */
net->want_addr_dump_ = true;
net->askForStateDump();
net->thread_timer_.wake_up();
} else if (is_del_event && temp_idx == net->ifid_) {
spdlog::debug("network: default route deleted {}/if{}",
net->ifname_, temp_idx);
net->ifname_.clear();
net->clearIface();
net->dp.emit();
/* Ask for a dump of all routes in case another one is already
* setup. If there's none, there'll be an event with new one
* later. */
net->want_route_dump_ = true;
net->askForStateDump();
}
}
break;
}
}
return NL_OK;
}
void waybar::modules::Network::askForStateDump(void) {
/* We need to wait until the current dump is done before sending new
* messages. handleEventsDone() is called when a dump is done. */
if (dump_in_progress_)
return;
struct rtgenmsg rt_hdr = {
.rtgen_family = AF_UNSPEC,
};
if (want_route_dump_) {
rt_hdr.rtgen_family = family_;
nl_send_simple(ev_sock_, RTM_GETROUTE, NLM_F_DUMP,
&rt_hdr, sizeof (rt_hdr));
want_route_dump_ = false;
dump_in_progress_ = true;
} else if (want_link_dump_) {
nl_send_simple(ev_sock_, RTM_GETLINK, NLM_F_DUMP,
&rt_hdr, sizeof (rt_hdr));
want_link_dump_ = false;
dump_in_progress_ = true;
} else if (want_addr_dump_) {
rt_hdr.rtgen_family = family_;
nl_send_simple(ev_sock_, RTM_GETADDR, NLM_F_DUMP,
&rt_hdr, sizeof (rt_hdr));
want_addr_dump_ = false;
dump_in_progress_ = true;
}
}
int waybar::modules::Network::handleEventsDone(struct nl_msg *msg, void *data) {
auto net = static_cast<waybar::modules::Network *>(data);
net->dump_in_progress_ = false;
net->askForStateDump();
return NL_OK;
}
int waybar::modules::Network::handleScan(struct nl_msg *msg, void *data) {
auto net = static_cast<waybar::modules::Network *>(data);
auto gnlh = static_cast<genlmsghdr *>(nlmsg_data(nlmsg_hdr(msg)));
struct nlattr * tb[NL80211_ATTR_MAX + 1];
struct nlattr * bss[NL80211_BSS_MAX + 1];
struct nla_policy bss_policy[NL80211_BSS_MAX + 1]{};
bss_policy[NL80211_BSS_TSF].type = NLA_U64;
bss_policy[NL80211_BSS_FREQUENCY].type = NLA_U32;
bss_policy[NL80211_BSS_BSSID].type = NLA_UNSPEC;
bss_policy[NL80211_BSS_BEACON_INTERVAL].type = NLA_U16;
bss_policy[NL80211_BSS_CAPABILITY].type = NLA_U16;
bss_policy[NL80211_BSS_INFORMATION_ELEMENTS].type = NLA_UNSPEC;
bss_policy[NL80211_BSS_SIGNAL_MBM].type = NLA_U32;
bss_policy[NL80211_BSS_SIGNAL_UNSPEC].type = NLA_U8;
bss_policy[NL80211_BSS_STATUS].type = NLA_U32;
if (nla_parse(
tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), nullptr) < 0) {
return NL_SKIP;
}
if (tb[NL80211_ATTR_BSS] == nullptr) {
return NL_SKIP;
}
if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy) != 0) {
return NL_SKIP;
}
if (!net->associatedOrJoined(bss)) {
return NL_SKIP;
}
net->parseEssid(bss);
net->parseSignal(bss);
net->parseFreq(bss);
return NL_OK;
}
void waybar::modules::Network::parseEssid(struct nlattr **bss) {
if (bss[NL80211_BSS_INFORMATION_ELEMENTS] != nullptr) {
auto ies = static_cast<char *>(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]));
auto ies_len = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
const auto hdr_len = 2;
while (ies_len > hdr_len && ies[0] != 0) {
ies_len -= ies[1] + hdr_len;
ies += ies[1] + hdr_len;
}
if (ies_len > hdr_len && ies_len > ies[1] + hdr_len) {
auto essid_begin = ies + hdr_len;
auto essid_end = essid_begin + ies[1];
std::string essid_raw;
std::copy(essid_begin, essid_end, std::back_inserter(essid_raw));
essid_ = Glib::Markup::escape_text(essid_raw);
}
}
}
void waybar::modules::Network::parseSignal(struct nlattr **bss) {
if (bss[NL80211_BSS_SIGNAL_MBM] != nullptr) {
// signalstrength in dBm from mBm
signal_strength_dbm_ = nla_get_s32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
// WiFi-hardware usually operates in the range -90 to -20dBm.
const int hardwareMax = -20;
const int hardwareMin = -90;
const int strength =
((signal_strength_dbm_ - hardwareMin) / double{hardwareMax - hardwareMin}) * 100;
signal_strength_ = std::clamp(strength, 0, 100);
}
if (bss[NL80211_BSS_SIGNAL_UNSPEC] != nullptr) {
signal_strength_ = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
}
}
void waybar::modules::Network::parseFreq(struct nlattr **bss) {
if (bss[NL80211_BSS_FREQUENCY] != nullptr) {
// in MHz
frequency_ = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
}
}
bool waybar::modules::Network::associatedOrJoined(struct nlattr **bss) {
if (bss[NL80211_BSS_STATUS] == nullptr) {
return false;
}
auto status = nla_get_u32(bss[NL80211_BSS_STATUS]);
switch (status) {
case NL80211_BSS_STATUS_ASSOCIATED:
case NL80211_BSS_STATUS_IBSS_JOINED:
case NL80211_BSS_STATUS_AUTHENTICATED:
return true;
default:
return false;
}
}
auto waybar::modules::Network::getInfo() -> void {
struct nl_msg *nl_msg = nlmsg_alloc();
if (nl_msg == nullptr) {
return;
}
if (genlmsg_put(
nl_msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id_, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ==
nullptr ||
nla_put_u32(nl_msg, NL80211_ATTR_IFINDEX, ifid_) < 0) {
nlmsg_free(nl_msg);
return;
}
nl_send_sync(sock_, nl_msg);
}
// https://gist.github.com/rressi/92af77630faf055934c723ce93ae2495
bool waybar::modules::Network::wildcardMatch(const std::string &pattern,
const std::string &text) const {
auto P = int(pattern.size());
auto T = int(text.size());
auto p = 0, fallback_p = -1;
auto t = 0, fallback_t = -1;
while (t < T) {
// Wildcard match:
if (p < P && pattern[p] == '*') {
fallback_p = p++; // starting point after failures
fallback_t = t; // starting point after failures
}
// Simple match:
else if (p < P && (pattern[p] == '?' || pattern[p] == text[t])) {
p++;
t++;
}
// Failure, fall back just after last matched '*':
else if (fallback_p >= 0) {
p = fallback_p + 1; // position just after last matched '*"
t = ++fallback_t; // re-try to match text from here
}
// There were no '*' before, so we fail here:
else {
return false;
}
}
// Consume all '*' at the end of pattern:
while (p < P && pattern[p] == '*') p++;
return p == P;
}
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