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i3status/src/print_wireless_info.c
Sascha Wessel 3d6b1b576b wireless: update %signal and %quality based on station info on Linux (#368) 
Use station info instead of bss info to update %signal and %quality.
Bss info is based on scan info and doesn't get updated often. Station
info get's updated with every beacon. Bss info still used as fallback.
2019-10-21 08:48:50 +02:00

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// vim:ts=4:sw=4:expandtab
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>
#include <sys/socket.h>
#ifdef __linux__
#include <errno.h>
#include <net/if.h>
#include <netlink/netlink.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#include <linux/nl80211.h>
#include <linux/if_ether.h>
#define IW_ESSID_MAX_SIZE 32
#endif
#ifdef __APPLE__
#define IW_ESSID_MAX_SIZE 32
#endif
#ifdef __FreeBSD__
#include <sys/param.h>
#include <sys/ioctl.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net80211/ieee80211.h>
#include <net80211/ieee80211_ioctl.h>
#include <unistd.h>
#define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
#endif
#ifdef __DragonFly__
#include <sys/param.h>
#include <sys/ioctl.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <net/if.h>
#include <net/if_media.h>
#include <netproto/802_11/ieee80211.h>
#include <netproto/802_11/ieee80211_ioctl.h>
#include <unistd.h>
#define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
#endif
#ifdef __OpenBSD__
#include <sys/ioctl.h>
#include <net/if.h>
#include <sys/select.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <net80211/ieee80211.h>
#include <net80211/ieee80211_ioctl.h>
#define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
#endif
#ifdef __NetBSD__
#include <sys/types.h>
#include <sys/socket.h>
#include <net80211/ieee80211.h>
#define IW_ESSID_MAX_SIZE IEEE80211_NWID_LEN
#endif
#include "i3status.h"
#define WIRELESS_INFO_FLAG_HAS_ESSID (1 << 0)
#define WIRELESS_INFO_FLAG_HAS_QUALITY (1 << 1)
#define WIRELESS_INFO_FLAG_HAS_SIGNAL (1 << 2)
#define WIRELESS_INFO_FLAG_HAS_NOISE (1 << 3)
#define WIRELESS_INFO_FLAG_HAS_FREQUENCY (1 << 4)
#define PERCENT_VALUE(value, total) ((int)(value * 100 / (float)total + 0.5f))
typedef struct {
int flags;
#ifdef IW_ESSID_MAX_SIZE
char essid[IW_ESSID_MAX_SIZE + 1];
#endif
#ifdef __linux__
uint8_t bssid[ETH_ALEN];
#endif
int quality;
int quality_max;
int quality_average;
int signal_level;
int signal_level_max;
int noise_level;
int noise_level_max;
int bitrate;
double frequency;
} wireless_info_t;
#ifdef __linux__
// Like iw_print_bitrate, but without the dependency on libiw.
static void print_bitrate(char *buffer, int buflen, int bitrate) {
const int kilo = 1e3;
const int mega = 1e6;
const int giga = 1e9;
const double rate = bitrate;
char scale;
int divisor;
if (rate >= giga) {
scale = 'G';
divisor = giga;
} else if (rate >= mega) {
scale = 'M';
divisor = mega;
} else {
scale = 'k';
divisor = kilo;
}
snprintf(buffer, buflen, "%g %cb/s", rate / divisor, scale);
}
// Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
static uint32_t nl80211_xbm_to_percent(int32_t xbm, int32_t divisor) {
#define NOISE_FLOOR_DBM -90
#define SIGNAL_MAX_DBM -20
xbm /= divisor;
if (xbm < NOISE_FLOOR_DBM)
xbm = NOISE_FLOOR_DBM;
if (xbm > SIGNAL_MAX_DBM)
xbm = SIGNAL_MAX_DBM;
return 100 - 70 * (((float)SIGNAL_MAX_DBM - (float)xbm) / ((float)SIGNAL_MAX_DBM - (float)NOISE_FLOOR_DBM));
}
// Based on NetworkManager/src/platform/wifi/wifi-utils-nl80211.c
static void find_ssid(uint8_t *ies, uint32_t ies_len, uint8_t **ssid, uint32_t *ssid_len) {
#define WLAN_EID_SSID 0
*ssid = NULL;
*ssid_len = 0;
while (ies_len > 2 && ies[0] != WLAN_EID_SSID) {
ies_len -= ies[1] + 2;
ies += ies[1] + 2;
}
if (ies_len < 2)
return;
if (ies_len < (uint32_t)(2 + ies[1]))
return;
*ssid_len = ies[1];
*ssid = ies + 2;
}
static int gwi_sta_cb(struct nl_msg *msg, void *data) {
wireless_info_t *info = data;
struct nlattr *tb[NL80211_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
[NL80211_STA_INFO_RX_BITRATE] = {.type = NLA_NESTED},
};
static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
[NL80211_RATE_INFO_BITRATE] = {.type = NLA_U16},
};
if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
return NL_SKIP;
if (tb[NL80211_ATTR_STA_INFO] == NULL)
return NL_SKIP;
if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, tb[NL80211_ATTR_STA_INFO], stats_policy))
return NL_SKIP;
if (sinfo[NL80211_STA_INFO_RX_BITRATE] == NULL)
return NL_SKIP;
if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
return NL_SKIP;
if (rinfo[NL80211_RATE_INFO_BITRATE] == NULL)
return NL_SKIP;
// NL80211_RATE_INFO_BITRATE is specified in units of 100 kbit/s, but iw
// used to specify bit/s, so we convert to use the same code path.
info->bitrate = (int)nla_get_u16(rinfo[NL80211_RATE_INFO_BITRATE]) * 100 * 1000;
if (sinfo[NL80211_STA_INFO_SIGNAL] != NULL) {
info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
info->signal_level = (int8_t)nla_get_u8(sinfo[NL80211_STA_INFO_SIGNAL]);
info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
info->quality = nl80211_xbm_to_percent(info->signal_level, 1);
info->quality_max = 100;
info->quality_average = 50;
}
return NL_SKIP;
}
static int gwi_scan_cb(struct nl_msg *msg, void *data) {
wireless_info_t *info = data;
struct genlmsghdr *gnlh = 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] = {
[NL80211_BSS_FREQUENCY] = {.type = NLA_U32},
[NL80211_BSS_BSSID] = {.type = NLA_UNSPEC},
[NL80211_BSS_INFORMATION_ELEMENTS] = {.type = NLA_UNSPEC},
[NL80211_BSS_SIGNAL_MBM] = {.type = NLA_U32},
[NL80211_BSS_SIGNAL_UNSPEC] = {.type = NLA_U8},
[NL80211_BSS_STATUS] = {.type = NLA_U32},
};
if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
return NL_SKIP;
if (tb[NL80211_ATTR_BSS] == NULL)
return NL_SKIP;
if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
return NL_SKIP;
if (bss[NL80211_BSS_STATUS] == NULL)
return NL_SKIP;
const uint32_t status = nla_get_u32(bss[NL80211_BSS_STATUS]);
if (status != NL80211_BSS_STATUS_ASSOCIATED &&
status != NL80211_BSS_STATUS_IBSS_JOINED)
return NL_SKIP;
if (bss[NL80211_BSS_BSSID] == NULL)
return NL_SKIP;
memcpy(info->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
if (bss[NL80211_BSS_FREQUENCY]) {
info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
info->frequency = (double)nla_get_u32(bss[NL80211_BSS_FREQUENCY]) * 1e6;
}
if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
info->signal_level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
info->signal_level_max = 100;
info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
info->quality = info->signal_level;
info->quality_max = 100;
info->quality_average = 50;
}
if (bss[NL80211_BSS_SIGNAL_MBM]) {
info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
info->signal_level = (int)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
info->quality = nl80211_xbm_to_percent(nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]), 100);
info->quality_max = 100;
info->quality_average = 50;
}
if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
uint8_t *ssid;
uint32_t ssid_len;
find_ssid(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
&ssid, &ssid_len);
if (ssid && ssid_len) {
info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
snprintf(info->essid, sizeof(info->essid), "%.*s", ssid_len, ssid);
}
}
return NL_SKIP;
}
#endif
static int get_wireless_info(const char *interface, wireless_info_t *info) {
memset(info, 0, sizeof(wireless_info_t));
#ifdef __linux__
struct nl_sock *sk = nl_socket_alloc();
if (genl_connect(sk) != 0)
goto error1;
if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_scan_cb, info) < 0)
goto error1;
const int nl80211_id = genl_ctrl_resolve(sk, "nl80211");
if (nl80211_id < 0)
goto error1;
const unsigned int ifidx = if_nametoindex(interface);
if (ifidx == 0)
goto error1;
struct nl_msg *msg = NULL;
if ((msg = nlmsg_alloc()) == NULL)
goto error1;
if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ||
nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0)
goto error2;
if (nl_send_sync(sk, msg) < 0)
// nl_send_sync calls nlmsg_free()
goto error1;
msg = NULL;
if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_sta_cb, info) < 0)
goto error1;
if ((msg = nlmsg_alloc()) == NULL)
goto error1;
if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_STATION, 0) || nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0 || nla_put(msg, NL80211_ATTR_MAC, 6, info->bssid) < 0)
goto error2;
if (nl_send_sync(sk, msg) < 0)
// nl_send_sync calls nlmsg_free()
goto error1;
msg = NULL;
nl_socket_free(sk);
return 1;
error2:
nlmsg_free(msg);
error1:
nl_socket_free(sk);
return 0;
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__)
int s, inwid;
union {
struct ieee80211req_sta_req req;
uint8_t buf[24 * 1024];
} u;
struct ieee80211req na;
char bssid[IEEE80211_ADDR_LEN];
size_t len;
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return (0);
memset(&na, 0, sizeof(na));
strlcpy(na.i_name, interface, sizeof(na.i_name));
na.i_type = IEEE80211_IOC_SSID;
na.i_data = &info->essid[0];
na.i_len = IEEE80211_NWID_LEN + 1;
if ((inwid = ioctl(s, SIOCG80211, (caddr_t)&na)) == -1) {
close(s);
return (0);
}
if (inwid == 0) {
if (na.i_len <= IEEE80211_NWID_LEN)
len = na.i_len + 1;
else
len = IEEE80211_NWID_LEN + 1;
info->essid[len - 1] = '\0';
} else {
close(s);
return (0);
}
info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
memset(&na, 0, sizeof(na));
strlcpy(na.i_name, interface, sizeof(na.i_name));
na.i_type = IEEE80211_IOC_BSSID;
na.i_data = bssid;
na.i_len = sizeof(bssid);
if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
close(s);
return (0);
}
memcpy(u.req.is_u.macaddr, bssid, sizeof(bssid));
memset(&na, 0, sizeof(na));
strlcpy(na.i_name, interface, sizeof(na.i_name));
na.i_type = IEEE80211_IOC_STA_INFO;
na.i_data = &u;
na.i_len = sizeof(u);
if (ioctl(s, SIOCG80211, (caddr_t)&na) == -1) {
close(s);
return (0);
}
close(s);
if (na.i_len >= sizeof(u.req)) {
/*
* Just use the first BSSID returned even if there are
* multiple APs sharing the same BSSID.
*/
info->signal_level = u.req.info[0].isi_rssi / 2 +
u.req.info[0].isi_noise;
info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
info->noise_level = u.req.info[0].isi_noise;
info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
}
return 1;
#endif
#ifdef __OpenBSD__
struct ifreq ifr;
struct ieee80211_bssid bssid;
struct ieee80211_nwid nwid;
struct ieee80211_nodereq nr;
struct ether_addr ea;
int s, len, ibssid, inwid;
u_int8_t zero_bssid[IEEE80211_ADDR_LEN];
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return (0);
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_data = (caddr_t)&nwid;
(void)strlcpy(ifr.ifr_name, interface, sizeof(ifr.ifr_name));
inwid = ioctl(s, SIOCG80211NWID, (caddr_t)&ifr);
memset(&bssid, 0, sizeof(bssid));
strlcpy(bssid.i_name, interface, sizeof(bssid.i_name));
ibssid = ioctl(s, SIOCG80211BSSID, &bssid);
if (ibssid != 0 || inwid != 0) {
close(s);
return 0;
}
/* NWID */
{
if (nwid.i_len <= IEEE80211_NWID_LEN)
len = nwid.i_len + 1;
else
len = IEEE80211_NWID_LEN + 1;
strncpy(&info->essid[0], (char *)nwid.i_nwid, len);
info->essid[IW_ESSID_MAX_SIZE] = '\0';
info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
}
/* Signal strength */
{
memset(&zero_bssid, 0, sizeof(zero_bssid));
if (ibssid == 0 && memcmp(bssid.i_bssid, zero_bssid, IEEE80211_ADDR_LEN) != 0) {
memcpy(&ea.ether_addr_octet, bssid.i_bssid, sizeof(ea.ether_addr_octet));
bzero(&nr, sizeof(nr));
bcopy(bssid.i_bssid, &nr.nr_macaddr, sizeof(nr.nr_macaddr));
strlcpy(nr.nr_ifname, interface, sizeof(nr.nr_ifname));
if (ioctl(s, SIOCG80211NODE, &nr) == 0 && nr.nr_rssi) {
info->signal_level = nr.nr_rssi;
if (nr.nr_max_rssi)
info->signal_level_max = nr.nr_max_rssi;
info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
}
}
}
close(s);
return 1;
#endif
return 0;
}
/* Table summarizing what is the decision to prefer IPv4 or IPv6
* based their values.
*
* | ipv4_address | ipv6_address | Chosen IP | Color |
* |--------------|--------------|-----------|-------------------|
* | NULL | NULL | None | bad (red) |
* | NULL | no IP | IPv6 | degraded (orange) |
* | NULL | ::1/128 | IPv6 | ok (green) |
* | no IP | NULL | IPv4 | degraded |
* | no IP | no IP | IPv4 | degraded |
* | no IP | ::1/128 | IPv6 | ok |
* | 127.0.0.1 | NULL | IPv4 | ok |
* | 127.0.0.1 | no IP | IPv4 | ok |
* | 127.0.0.1 | ::1/128 | IPv4 | ok |
*/
void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface, const char *format_up, const char *format_down, const char *format_quality) {
const char *walk;
char *outwalk = buffer;
wireless_info_t info;
INSTANCE(interface);
char *ipv4_address = sstrdup(get_ip_addr(interface, AF_INET));
char *ipv6_address = sstrdup(get_ip_addr(interface, AF_INET6));
/*
* Removing '%' and following characters from IPv6 since the interface identifier is redundant,
* as the output already includes the interface name.
*/
if (ipv6_address != NULL) {
char *prct_ptr = strstr(ipv6_address, "%");
if (prct_ptr != NULL) {
*prct_ptr = '\0';
}
}
bool prefer_ipv4 = true;
if (ipv4_address == NULL) {
if (ipv6_address == NULL) {
START_COLOR("color_bad");
outwalk += sprintf(outwalk, "%s", format_down);
goto out;
} else {
prefer_ipv4 = false;
}
} else if (BEGINS_WITH(ipv4_address, "no IP") && ipv6_address != NULL && !BEGINS_WITH(ipv6_address, "no IP")) {
prefer_ipv4 = false;
}
const char *ip_address = (prefer_ipv4) ? ipv4_address : ipv6_address;
if (!get_wireless_info(interface, &info)) {
walk = format_down;
START_COLOR("color_bad");
} else {
walk = format_up;
if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY)
START_COLOR((info.quality < info.quality_average ? "color_degraded" : "color_good"));
else {
if (BEGINS_WITH(ip_address, "no IP")) {
START_COLOR("color_degraded");
} else {
START_COLOR("color_good");
}
}
}
for (; *walk != '\0'; walk++) {
if (*walk != '%') {
*(outwalk++) = *walk;
} else if (BEGINS_WITH(walk + 1, "quality")) {
if (info.flags & WIRELESS_INFO_FLAG_HAS_QUALITY) {
if (info.quality_max)
outwalk += sprintf(outwalk, format_quality, PERCENT_VALUE(info.quality, info.quality_max), pct_mark);
else
outwalk += sprintf(outwalk, "%d", info.quality);
} else {
*(outwalk++) = '?';
}
walk += strlen("quality");
} else if (BEGINS_WITH(walk + 1, "signal")) {
if (info.flags & WIRELESS_INFO_FLAG_HAS_SIGNAL) {
if (info.signal_level_max)
outwalk += sprintf(outwalk, "%3d%s", PERCENT_VALUE(info.signal_level, info.signal_level_max), pct_mark);
else
outwalk += sprintf(outwalk, "%d dBm", info.signal_level);
} else {
*(outwalk++) = '?';
}
walk += strlen("signal");
} else if (BEGINS_WITH(walk + 1, "noise")) {
if (info.flags & WIRELESS_INFO_FLAG_HAS_NOISE) {
if (info.noise_level_max)
outwalk += sprintf(outwalk, "%3d%s", PERCENT_VALUE(info.noise_level, info.noise_level_max), pct_mark);
else
outwalk += sprintf(outwalk, "%d dBm", info.noise_level);
} else {
*(outwalk++) = '?';
}
walk += strlen("noise");
} else if (BEGINS_WITH(walk + 1, "essid")) {
#ifdef IW_ESSID_MAX_SIZE
if (info.flags & WIRELESS_INFO_FLAG_HAS_ESSID)
maybe_escape_markup(info.essid, &outwalk);
else
#endif
*(outwalk++) = '?';
walk += strlen("essid");
} else if (BEGINS_WITH(walk + 1, "frequency")) {
if (info.flags & WIRELESS_INFO_FLAG_HAS_FREQUENCY)
outwalk += sprintf(outwalk, "%1.1f GHz", info.frequency / 1e9);
else
*(outwalk++) = '?';
walk += strlen("frequency");
} else if (BEGINS_WITH(walk + 1, "ip")) {
outwalk += sprintf(outwalk, "%s", ip_address);
walk += strlen("ip");
}
#ifdef __linux__
else if (BEGINS_WITH(walk + 1, "bitrate")) {
char br_buffer[128];
print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
outwalk += sprintf(outwalk, "%s", br_buffer);
walk += strlen("bitrate");
}
#endif
else {
*(outwalk++) = '%';
}
}
out:
END_COLOR;
free(ipv4_address);
free(ipv6_address);
OUTPUT_FULL_TEXT(buffer);
}
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