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01c682c41ecb6a415b477745166ef430a344c370
Waybar/src/modules/network.cpp
Eivind Uggedal fb8cda9d90 network: make missing nl80211 non-fatal 
This will enable the networking module to be used for ethernet
interfaces on kernels without nl80211 support.

It should be reasonable to allow desktop systems without
wireless interfaces to run custom kenrel configs
without nl80211 compiled in.
2020-07-31 08:15:16 +02:00

784 lines
25 KiB
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#include "modules/network.hpp"
#include <spdlog/spdlog.h>
#include <sys/eventfd.h>
#include <fstream>
#include <cassert>
#include "util/format.hpp"
#include "util/rfkill.hpp"
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),
cidr_(-1),
signal_strength_dbm_(0),
signal_strength_(0),
frequency_(0),
rfkill_{RFKILL_TYPE_WLAN} {
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;
}
createEventSocket();
createInfoSocket();
auto default_iface = getPreferredIface(-1, false);
if (default_iface != -1) {
ifid_ = default_iface;
char ifname[IF_NAMESIZE];
if_indextoname(default_iface, ifname);
ifname_ = ifname;
getInterfaceAddress();
}
dp.emit();
worker();
}
waybar::modules::Network::~Network() {
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);
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");
}
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);
}
}
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_);
};
thread_rfkill_ = [this] {
rfkill_.waitForEvent();
{
std::lock_guard<std::mutex> lock(mutex_);
if (ifid_ > 0) {
getInfo();
dp.emit();
}
}
};
}
const std::string waybar::modules::Network::getNetworkState() const {
if (ifid_ == -1) {
if (rfkill_.getState())
return "disabled";
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() != text) {
label_.set_tooltip_text(tooltip_text);
}
} else if (label_.get_tooltip_text() != text) {
label_.set_tooltip_text(text);
}
}
// Call parent update
ALabel::update();
}
// Based on https://gist.github.com/Yawning/c70d804d4b8ae78cc698
int waybar::modules::Network::getExternalInterface(int skip_idx) const {
static const uint32_t route_buffer_size = 8192;
struct nlmsghdr * hdr = nullptr;
struct rtmsg * rt = nullptr;
char resp[route_buffer_size] = {0};
int ifidx = -1;
/* Prepare request. */
constexpr uint32_t reqlen = NLMSG_SPACE(sizeof(*rt));
char req[reqlen] = {0};
/* Build the RTM_GETROUTE request. */
hdr = reinterpret_cast<struct nlmsghdr *>(req);
hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*rt));
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
hdr->nlmsg_type = RTM_GETROUTE;
rt = static_cast<struct rtmsg *>(NLMSG_DATA(hdr));
rt->rtm_family = family_;
rt->rtm_table = RT_TABLE_MAIN;
/* Issue the query. */
if (netlinkRequest(req, reqlen) < 0) {
goto out;
}
/* Read the response(s).
*
* WARNING: All the packets generated by the request must be consumed (as in,
* consume responses till NLMSG_DONE/NLMSG_ERROR is encountered).
*/
do {
auto len = netlinkResponse(resp, route_buffer_size);
if (len < 0) {
goto out;
}
/* Parse the response payload into netlink messages. */
for (hdr = reinterpret_cast<struct nlmsghdr *>(resp); NLMSG_OK(hdr, len);
hdr = NLMSG_NEXT(hdr, len)) {
if (hdr->nlmsg_type == NLMSG_DONE) {
goto out;
}
if (hdr->nlmsg_type == NLMSG_ERROR) {
/* Even if we found the interface index, something is broken with the
* netlink socket, so return an error.
*/
ifidx = -1;
goto out;
}
/* If we found the correct answer, skip parsing the attributes. */
if (ifidx != -1) {
continue;
}
/* Find the message(s) concerting the main routing table, each message
* corresponds to a single routing table entry.
*/
rt = static_cast<struct rtmsg *>(NLMSG_DATA(hdr));
if (rt->rtm_table != RT_TABLE_MAIN) {
continue;
}
/* Parse all the attributes for a single routing table entry. */
struct rtattr *attr = RTM_RTA(rt);
uint64_t attrlen = RTM_PAYLOAD(hdr);
bool has_gateway = false;
bool has_destination = false;
int temp_idx = -1;
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 = (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;
}
}
/* If this is the default route, and we know the interface index,
* we can stop parsing this message.
*/
if (has_gateway && !has_destination && temp_idx != -1 && temp_idx != skip_idx) {
ifidx = temp_idx;
break;
}
}
} while (true);
out:
return ifidx;
}
void waybar::modules::Network::getInterfaceAddress() {
struct ifaddrs *ifaddr, *ifa;
cidr_ = 0;
int success = getifaddrs(&ifaddr);
if (success != 0) {
return;
}
ifa = ifaddr;
while (ifa != nullptr) {
if (ifa->ifa_addr != nullptr && ifa->ifa_addr->sa_family == family_ &&
ifa->ifa_name == ifname_) {
char ipaddr[INET6_ADDRSTRLEN];
char netmask[INET6_ADDRSTRLEN];
unsigned int cidr = 0;
if (family_ == AF_INET) {
ipaddr_ = inet_ntop(AF_INET,
&reinterpret_cast<struct sockaddr_in *>(ifa->ifa_addr)->sin_addr,
ipaddr,
INET_ADDRSTRLEN);
auto net_addr = reinterpret_cast<struct sockaddr_in *>(ifa->ifa_netmask);
netmask_ = inet_ntop(AF_INET, &net_addr->sin_addr, netmask, INET_ADDRSTRLEN);
unsigned int cidrRaw = net_addr->sin_addr.s_addr;
while (cidrRaw) {
cidr += cidrRaw & 1;
cidrRaw >>= 1;
}
} else {
ipaddr_ = inet_ntop(AF_INET6,
&reinterpret_cast<struct sockaddr_in6 *>(ifa->ifa_addr)->sin6_addr,
ipaddr,
INET6_ADDRSTRLEN);
auto net_addr = reinterpret_cast<struct sockaddr_in6 *>(ifa->ifa_netmask);
netmask_ = inet_ntop(AF_INET6, &net_addr->sin6_addr, netmask, INET6_ADDRSTRLEN);
for (size_t i = 0; i < sizeof(net_addr->sin6_addr.s6_addr); ++i) {
unsigned char cidrRaw = net_addr->sin6_addr.s6_addr[i];
while (cidrRaw) {
cidr += cidrRaw & 1;
cidrRaw >>= 1;
}
}
}
cidr_ = cidr;
break;
}
ifa = ifa->ifa_next;
}
freeifaddrs(ifaddr);
}
int waybar::modules::Network::netlinkRequest(void *req, uint32_t reqlen, uint32_t groups) const {
struct sockaddr_nl sa = {};
sa.nl_family = AF_NETLINK;
sa.nl_groups = groups;
struct iovec iov = {req, reqlen};
struct msghdr msg = {
.msg_name = &sa,
.msg_namelen = sizeof(sa),
.msg_iov = &iov,
.msg_iovlen = 1,
};
return sendmsg(nl_socket_get_fd(ev_sock_), &msg, 0);
}
int waybar::modules::Network::netlinkResponse(void *resp, uint32_t resplen, uint32_t groups) const {
struct sockaddr_nl sa = {};
sa.nl_family = AF_NETLINK;
sa.nl_groups = groups;
struct iovec iov = {resp, resplen};
struct msghdr msg = {
.msg_name = &sa,
.msg_namelen = sizeof(sa),
.msg_iov = &iov,
.msg_iovlen = 1,
};
auto ret = recvmsg(nl_socket_get_fd(ev_sock_), &msg, 0);
if (msg.msg_flags & MSG_TRUNC) {
return -1;
}
return ret;
}
bool waybar::modules::Network::checkInterface(struct ifinfomsg *rtif, std::string name) {
if (config_["interface"].isString()) {
return config_["interface"].asString() == name ||
wildcardMatch(config_["interface"].asString(), name);
}
// getExternalInterface may need some delay to detect external interface
for (uint8_t tries = 0; tries < MAX_RETRY; tries += 1) {
auto external_iface = getExternalInterface();
if (external_iface > 0) {
return external_iface == rtif->ifi_index;
}
std::this_thread::sleep_for(std::chrono::milliseconds(500));
}
return false;
}
int waybar::modules::Network::getPreferredIface(int skip_idx, bool wait) const {
int ifid = -1;
if (config_["interface"].isString()) {
ifid = if_nametoindex(config_["interface"].asCString());
if (ifid > 0) {
return ifid;
} else {
// Try with wildcard
struct ifaddrs *ifaddr, *ifa;
int success = getifaddrs(&ifaddr);
if (success != 0) {
return -1;
}
ifa = ifaddr;
ifid = -1;
while (ifa != nullptr) {
if (wildcardMatch(config_["interface"].asString(), ifa->ifa_name)) {
ifid = if_nametoindex(ifa->ifa_name);
break;
}
ifa = ifa->ifa_next;
}
freeifaddrs(ifaddr);
return ifid;
}
}
// getExternalInterface may need some delay to detect external interface
for (uint8_t tries = 0; tries < MAX_RETRY; tries += 1) {
ifid = getExternalInterface(skip_idx);
if (ifid > 0) {
return ifid;
}
if (wait) {
std::this_thread::sleep_for(std::chrono::milliseconds(500));
}
}
return -1;
}
void waybar::modules::Network::clearIface() {
essid_.clear();
ipaddr_.clear();
netmask_.clear();
cidr_ = 0;
signal_strength_dbm_ = 0;
signal_strength_ = 0;
frequency_ = 0;
}
void waybar::modules::Network::checkNewInterface(struct ifinfomsg *rtif) {
auto new_iface = getPreferredIface(rtif->ifi_index);
if (new_iface != -1) {
ifid_ = new_iface;
char ifname[IF_NAMESIZE];
if_indextoname(new_iface, ifname);
ifname_ = ifname;
getInterfaceAddress();
thread_timer_.wake_up();
} else {
ifid_ = -1;
dp.emit();
}
}
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);
auto ifi = static_cast<struct ifinfomsg *>(NLMSG_DATA(nh));
if (nh->nlmsg_type == RTM_DELADDR) {
// Check for valid interface
if (ifi->ifi_index == net->ifid_) {
net->ipaddr_.clear();
net->netmask_.clear();
net->cidr_ = 0;
if (!(ifi->ifi_flags & IFF_RUNNING)) {
net->clearIface();
// Check for a new interface and get info
net->checkNewInterface(ifi);
} else {
net->dp.emit();
}
return NL_OK;
}
} else if (nh->nlmsg_type == RTM_NEWLINK || nh->nlmsg_type == RTM_DELLINK) {
char ifname[IF_NAMESIZE];
if_indextoname(ifi->ifi_index, ifname);
// Check for valid interface
if (ifi->ifi_index != net->ifid_ && net->checkInterface(ifi, ifname)) {
net->ifname_ = ifname;
net->ifid_ = ifi->ifi_index;
// Get Iface and WIFI info
net->getInterfaceAddress();
net->thread_timer_.wake_up();
return NL_OK;
} else if (ifi->ifi_index == net->ifid_ &&
(!(ifi->ifi_flags & IFF_RUNNING) || !(ifi->ifi_flags & IFF_UP) ||
!net->checkInterface(ifi, ifname))) {
net->clearIface();
// Check for a new interface and get info
net->checkNewInterface(ifi);
return NL_OK;
}
} else {
char ifname[IF_NAMESIZE];
if_indextoname(ifi->ifi_index, ifname);
// Auto detected network can also be assigned here
if (ifi->ifi_index != net->ifid_ && net->checkInterface(ifi, ifname)) {
// If iface is different, clear data
if (ifi->ifi_index != net->ifid_) {
net->clearIface();
}
net->ifname_ = ifname;
net->ifid_ = ifi->ifi_index;
}
// Check for valid interface
if (ifi->ifi_index == net->ifid_) {
// Get Iface and WIFI info
net->getInterfaceAddress();
net->thread_timer_.wake_up();
return NL_OK;
}
}
return NL_SKIP;
}
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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