wireless (linux): switch from libiw to libnl
Based on http://cr.i3wm.org/patch/692/ by Alexander Monakov fixes #32 fixes #52
This commit is contained in:
Michael Stapelberg
parent
51c1dbdba2
commit
668bf2079f
3
Makefile
3
Makefile
@ -30,7 +30,8 @@ OS:=$(shell uname)
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ifeq ($(OS),Linux)
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CPPFLAGS+=-DLINUX
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CPPFLAGS+=-D_GNU_SOURCE
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LIBS+=-liw
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CFLAGS += $(shell pkg-config --cflags libnl-genl-3.0)
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LIBS += $(shell pkg-config --libs libnl-genl-3.0)
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LIBS+=-lasound
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endif
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@ -15,7 +15,7 @@ i3status has the following dependencies:
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* libconfuse-dev
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* libyajl-dev
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* libasound2-dev
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* libiw-dev
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* libnl-genl-3-dev
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* libcap2-bin (for getting network status without root permissions)
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* asciidoc (only for the documentation)
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* libpulse-dev (for getting the current volume using PulseAudio)
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@ -5,12 +5,15 @@
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#include <yajl/yajl_version.h>
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#ifdef LINUX
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#include <iwlib.h>
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#else
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#ifndef __FreeBSD__
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#include <errno.h>
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#include <net/if.h>
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#include <netlink/netlink.h>
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#include <netlink/genl/genl.h>
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#include <netlink/genl/ctrl.h>
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#include <linux/nl80211.h>
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#include <linux/if_ether.h>
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#define IW_ESSID_MAX_SIZE 32
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#endif
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#endif
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#ifdef __FreeBSD__
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#include <sys/param.h>
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@ -62,6 +65,7 @@
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typedef struct {
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int flags;
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char essid[IW_ESSID_MAX_SIZE + 1];
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uint8_t bssid[ETH_ALEN];
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int quality;
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int quality_max;
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int quality_average;
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@ -73,128 +77,235 @@ typedef struct {
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double frequency;
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} wireless_info_t;
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// Like iw_print_bitrate, but without the dependency on libiw.
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static void print_bitrate(char *buffer, int buflen, int bitrate) {
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const int kilo = 1e3;
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const int mega = 1e6;
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const int giga = 1e9;
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const double rate = bitrate;
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char scale;
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int divisor;
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if (rate >= giga) {
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scale = 'G';
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divisor = giga;
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} else if (rate >= mega) {
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scale = 'M';
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divisor = mega;
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} else {
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scale = 'k';
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divisor = kilo;
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}
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snprintf(buffer, buflen, "%g %cb/s", rate / divisor, scale);
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}
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static uint32_t nl80211_xbm_to_percent(int32_t xbm, uint32_t divisor) {
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#define NOISE_FLOOR_DBM -90
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#define SIGNAL_MAX_DBM -20
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xbm /= divisor;
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if (xbm < NOISE_FLOOR_DBM)
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xbm = NOISE_FLOOR_DBM;
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if (xbm > SIGNAL_MAX_DBM)
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xbm = SIGNAL_MAX_DBM;
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return 100 - 70 * (((float)SIGNAL_MAX_DBM - (float)xbm) / ((float)SIGNAL_MAX_DBM - (float)NOISE_FLOOR_DBM));
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}
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#define WLAN_EID_SSID 0
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static void find_ssid(uint8_t *ies, uint32_t ies_len, uint8_t **ssid, uint32_t *ssid_len) {
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*ssid = NULL;
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*ssid_len = 0;
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while (ies_len > 2 && ies[0] != WLAN_EID_SSID) {
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ies_len -= ies[1] + 2;
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ies += ies[1] + 2;
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}
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if (ies_len < 2)
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return;
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if (ies_len < 2 + ies[1])
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return;
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*ssid_len = ies[1];
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*ssid = ies + 2;
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}
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static int gwi_sta_cb(struct nl_msg *msg, void *data) {
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wireless_info_t *info = data;
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struct nlattr *tb[NL80211_ATTR_MAX + 1];
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struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
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struct nlattr *sinfo[NL80211_STA_INFO_MAX + 1];
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struct nlattr *rinfo[NL80211_RATE_INFO_MAX + 1];
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static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
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[NL80211_STA_INFO_RX_BITRATE] = {.type = NLA_NESTED},
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};
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static struct nla_policy rate_policy[NL80211_RATE_INFO_MAX + 1] = {
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[NL80211_RATE_INFO_BITRATE32] = {.type = NLA_U32},
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};
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if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
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return NL_SKIP;
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if (tb[NL80211_ATTR_STA_INFO] == NULL)
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return NL_SKIP;
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if (nla_parse_nested(sinfo, NL80211_STA_INFO_MAX, tb[NL80211_ATTR_STA_INFO], stats_policy))
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return NL_SKIP;
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if (sinfo[NL80211_STA_INFO_RX_BITRATE] == NULL)
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return NL_SKIP;
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if (nla_parse_nested(rinfo, NL80211_RATE_INFO_MAX, sinfo[NL80211_STA_INFO_RX_BITRATE], rate_policy))
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return NL_SKIP;
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if (rinfo[NL80211_RATE_INFO_BITRATE32] == NULL)
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return NL_SKIP;
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// NL80211_RATE_INFO_BITRATE32 is specified in units of 100 kbit/s, but iw
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// used to specify bit/s, so we convert to use the same code path.
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info->bitrate = nla_get_u32(rinfo[NL80211_RATE_INFO_BITRATE32]) * 100 * 1000;
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return NL_SKIP;
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}
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static int gwi_scan_cb(struct nl_msg *msg, void *data) {
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wireless_info_t *info = data;
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struct genlmsghdr *gnlh = genlmsg_hdr(nlmsg_hdr(msg));
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struct nlattr *tb[NL80211_ATTR_MAX + 1];
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struct nlattr *bss[NL80211_BSS_MAX + 1];
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struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
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[NL80211_BSS_FREQUENCY] = {.type = NLA_U32},
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[NL80211_BSS_BSSID] = {.type = NLA_UNSPEC},
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[NL80211_BSS_INFORMATION_ELEMENTS] = {.type = NLA_UNSPEC},
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[NL80211_BSS_SIGNAL_MBM] = {.type = NLA_U32},
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[NL80211_BSS_SIGNAL_UNSPEC] = {.type = NLA_U8},
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[NL80211_BSS_STATUS] = {.type = NLA_U32},
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};
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if (nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL) < 0)
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return NL_SKIP;
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if (tb[NL80211_ATTR_BSS] == NULL)
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return NL_SKIP;
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if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS], bss_policy))
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return NL_SKIP;
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if (bss[NL80211_BSS_STATUS] == NULL)
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return NL_SKIP;
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const uint32_t status = nla_get_u32(bss[NL80211_BSS_STATUS]);
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if (status != NL80211_BSS_STATUS_ASSOCIATED &&
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status != NL80211_BSS_STATUS_IBSS_JOINED)
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return NL_SKIP;
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if (bss[NL80211_BSS_BSSID] == NULL)
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return NL_SKIP;
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memcpy(info->bssid, nla_data(bss[NL80211_BSS_BSSID]), ETH_ALEN);
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if (bss[NL80211_BSS_FREQUENCY]) {
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info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
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info->frequency = (double)nla_get_u32(bss[NL80211_BSS_FREQUENCY]) * 1e6;
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}
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if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
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info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
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info->signal_level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
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info->signal_level_max = 100;
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info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
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info->quality = info->signal_level;
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info->quality_max = 100;
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info->quality_average = 50;
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}
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if (bss[NL80211_BSS_SIGNAL_MBM]) {
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info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
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info->signal_level = (int)nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
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info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
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info->quality = nl80211_xbm_to_percent(nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]), 100);
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info->quality_max = 100;
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info->quality_average = 50;
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}
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if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
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uint8_t *ssid;
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uint32_t ssid_len;
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find_ssid(nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
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nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]),
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&ssid, &ssid_len);
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if (ssid && ssid_len) {
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info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
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snprintf(info->essid, sizeof(info->essid), "%.*s", ssid_len, ssid);
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}
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}
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return NL_SKIP;
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}
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static int get_wireless_info(const char *interface, wireless_info_t *info) {
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memset(info, 0, sizeof(wireless_info_t));
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#ifdef LINUX
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int skfd = iw_sockets_open();
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if (skfd < 0) {
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perror("iw_sockets_open");
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return 0;
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}
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struct nl_sock *sk = nl_socket_alloc();
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if (genl_connect(sk) != 0)
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goto error1;
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wireless_config wcfg;
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if (iw_get_basic_config(skfd, interface, &wcfg) < 0) {
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close(skfd);
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return 0;
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}
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if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_scan_cb, info) < 0)
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goto error1;
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if (wcfg.has_essid && wcfg.essid_on) {
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info->flags |= WIRELESS_INFO_FLAG_HAS_ESSID;
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strncpy(&info->essid[0], wcfg.essid, IW_ESSID_MAX_SIZE);
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info->essid[IW_ESSID_MAX_SIZE] = '\0';
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}
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const int nl80211_id = genl_ctrl_resolve(sk, "nl80211");
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if (nl80211_id < 0)
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goto error1;
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if (wcfg.has_freq) {
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info->frequency = wcfg.freq;
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info->flags |= WIRELESS_INFO_FLAG_HAS_FREQUENCY;
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}
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const unsigned int ifidx = if_nametoindex(interface);
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if (ifidx == 0)
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goto error1;
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/* If the function iw_get_stats does not return proper stats, the
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* wifi is considered as down.
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* Since ad-hoc network does not have theses stats, we need to return
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* here for this mode. */
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if (wcfg.mode == 1) {
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close(skfd);
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return 1;
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}
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struct nl_msg *msg = NULL;
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if ((msg = nlmsg_alloc()) == NULL)
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goto error1;
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/* Wireless quality is a relative value in a driver-specific range.
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* Signal and noise level can be either relative or absolute values
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* in dBm. Furthermore, noise and quality can be expressed directly
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* in dBm or in RCPI (802.11k), which we convert to dBm. When those
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* values are expressed directly in dBm, they range from -192 to 63,
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* and since the values are packed into 8 bits, we need to perform
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* 8-bit arithmetic on them. Assume absolute values if everything
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* else fails (driver bug). */
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if (!genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, nl80211_id, 0, NLM_F_DUMP, NL80211_CMD_GET_SCAN, 0) ||
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nla_put_u32(msg, NL80211_ATTR_IFINDEX, ifidx) < 0)
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goto error2;
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iwrange range;
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if (iw_get_range_info(skfd, interface, &range) < 0) {
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close(skfd);
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return 0;
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}
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if (nl_send_sync(sk, msg) < 0)
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// nl_send_sync calls nlmsg_free()
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goto error1;
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msg = NULL;
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iwstats stats;
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if (iw_get_stats(skfd, interface, &stats, &range, 1) < 0) {
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close(skfd);
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return 0;
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}
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if (nl_socket_modify_cb(sk, NL_CB_VALID, NL_CB_CUSTOM, gwi_sta_cb, info) < 0)
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goto error1;
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if (stats.qual.level != 0 || (stats.qual.updated & (IW_QUAL_DBM | IW_QUAL_RCPI))) {
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if (!(stats.qual.updated & IW_QUAL_QUAL_INVALID)) {
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info->quality = stats.qual.qual;
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info->quality_max = range.max_qual.qual;
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info->quality_average = range.avg_qual.qual;
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info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
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}
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if ((msg = nlmsg_alloc()) == NULL)
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goto error1;
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if (stats.qual.updated & IW_QUAL_RCPI) {
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if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
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info->signal_level = stats.qual.level / 2.0 - 110 + 0.5;
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info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
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}
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if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
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info->noise_level = stats.qual.noise / 2.0 - 110 + 0.5;
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info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
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}
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} else {
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if ((stats.qual.updated & IW_QUAL_DBM) || stats.qual.level > range.max_qual.level) {
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if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
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info->signal_level = stats.qual.level;
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if (info->signal_level > 63)
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info->signal_level -= 256;
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info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
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}
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if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
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info->noise_level = stats.qual.noise;
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if (info->noise_level > 63)
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info->noise_level -= 256;
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info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
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}
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} else {
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if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
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info->signal_level = stats.qual.level;
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info->signal_level_max = range.max_qual.level;
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info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
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}
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if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
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info->noise_level = stats.qual.noise;
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info->noise_level_max = range.max_qual.noise;
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info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
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}
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}
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}
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} else {
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if (!(stats.qual.updated & IW_QUAL_QUAL_INVALID)) {
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info->quality = stats.qual.qual;
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info->flags |= WIRELESS_INFO_FLAG_HAS_QUALITY;
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}
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if (!(stats.qual.updated & IW_QUAL_LEVEL_INVALID)) {
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info->quality = stats.qual.level;
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info->flags |= WIRELESS_INFO_FLAG_HAS_SIGNAL;
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}
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if (!(stats.qual.updated & IW_QUAL_NOISE_INVALID)) {
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info->quality = stats.qual.noise;
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info->flags |= WIRELESS_INFO_FLAG_HAS_NOISE;
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}
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}
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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)
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goto error2;
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struct iwreq wrq;
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if (iw_get_ext(skfd, interface, SIOCGIWRATE, &wrq) >= 0)
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info->bitrate = wrq.u.bitrate.value;
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if (nl_send_sync(sk, msg) < 0)
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// nl_send_sync calls nlmsg_free()
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goto error1;
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msg = NULL;
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close(skfd);
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nl_socket_free(sk);
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return 1;
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error2:
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nlmsg_free(msg);
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error1:
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nl_socket_free(sk);
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return 0;
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#endif
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#if defined(__FreeBSD__) || defined(__DragonFly__)
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int s, inwid;
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@ -426,7 +537,7 @@ void print_wireless_info(yajl_gen json_gen, char *buffer, const char *interface,
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if (BEGINS_WITH(walk + 1, "bitrate")) {
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char br_buffer[128];
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iw_print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
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print_bitrate(br_buffer, sizeof(br_buffer), info.bitrate);
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outwalk += sprintf(outwalk, "%s", br_buffer);
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walk += strlen("bitrate");
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