wifi: switch to nl80211 interface
This commit is contained in:
Joakim Sindholt
@ -15,86 +15,234 @@
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(2 * (rssi + 100)))
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#if defined(__linux__)
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#include <limits.h>
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#include <linux/wireless.h>
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#include <stdint.h>
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#include <net/if.h>
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#include <linux/netlink.h>
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#include <linux/genetlink.h>
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#include <linux/nl80211.h>
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#define NET_OPERSTATE "/sys/class/net/%s/operstate"
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static int nlsock = -1;
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static uint32_t seq = 1;
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static char resp[4096];
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const char *
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wifi_perc(const char *interface)
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static char *
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findattr(int attr, char *p, char *e, size_t *len)
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{
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int cur;
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size_t i;
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char *p, *datastart;
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char path[PATH_MAX];
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char status[5];
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FILE *fp;
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struct nlattr nla;
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size_t alen;
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if (esnprintf(path, sizeof(path), NET_OPERSTATE, interface) < 0)
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return NULL;
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if (!(fp = fopen(path, "r"))) {
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warn("fopen '%s':", path);
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return NULL;
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while ((size_t)(e-p) >= sizeof(nla)) {
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memcpy(&nla, p, sizeof(nla));
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if (nla.nla_len < NLA_HDRLEN)
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return NULL;
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if (nla.nla_type == attr) {
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p += NLA_HDRLEN;
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*len = nla.nla_len-NLA_HDRLEN;
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return (size_t)(e-p)>=*len?p:NULL;
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}
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alen = NLA_ALIGN(nla.nla_len);
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if ((size_t)(e-p) < alen)
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return NULL;
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p += alen;
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}
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p = fgets(status, 5, fp);
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fclose(fp);
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if (!p || strcmp(status, "up\n") != 0)
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return NULL;
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return NULL;
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}
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if (!(fp = fopen("/proc/net/wireless", "r"))) {
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warn("fopen '/proc/net/wireless':");
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return NULL;
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static uint16_t
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nl80211fam(void)
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{
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static const char family[] = "nl80211";
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static uint16_t id;
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ssize_t r;
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size_t len;
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char ctrl[NLMSG_HDRLEN+GENL_HDRLEN+NLA_HDRLEN+NLA_ALIGN(sizeof(family))] = {0}, *p = ctrl;
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if (id)
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return id;
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memcpy(p, &(struct nlmsghdr){
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.nlmsg_len = sizeof(ctrl),
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.nlmsg_type = GENL_ID_CTRL,
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.nlmsg_flags = NLM_F_REQUEST,
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.nlmsg_seq = seq++,
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.nlmsg_pid = 0,
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}, sizeof(struct nlmsghdr));
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p += NLMSG_HDRLEN;
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memcpy(p, &(struct genlmsghdr){
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.cmd = CTRL_CMD_GETFAMILY,
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.version = 1,
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}, sizeof(struct genlmsghdr));
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p += GENL_HDRLEN;
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memcpy(p, &(struct nlattr){
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.nla_len = NLA_HDRLEN+sizeof(family),
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.nla_type = CTRL_ATTR_FAMILY_NAME,
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}, sizeof(struct nlattr));
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p += NLA_HDRLEN;
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memcpy(p, family, sizeof(family));
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if (nlsock < 0)
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nlsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
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if (nlsock < 0) {
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warn("socket 'AF_NETLINK':");
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return 0;
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}
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if (send(nlsock, ctrl, sizeof(ctrl), 0) != sizeof(ctrl)) {
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warn("send 'AF_NETLINK':");
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return 0;
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}
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r = recv(nlsock, resp, sizeof(resp), 0);
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if (r < 0) {
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warn("recv 'AF_NETLINK':");
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return 0;
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}
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if ((size_t)r <= sizeof(ctrl))
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return 0;
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p = findattr(CTRL_ATTR_FAMILY_ID, resp+sizeof(ctrl), resp+r, &len);
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if (p && len == 2)
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memcpy(&id, p, 2);
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return id;
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}
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for (i = 0; i < 3; i++)
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if (!(p = fgets(buf, sizeof(buf) - 1, fp)))
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break;
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static int
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ifindex(const char *interface)
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{
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static struct ifreq ifr;
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static int ifsock = -1;
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fclose(fp);
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if (i < 2 || !p)
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return NULL;
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if (!(datastart = strstr(buf, interface)))
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return NULL;
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datastart = (datastart+(strlen(interface)+1));
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sscanf(datastart + 1, " %*d %d %*d %*d\t\t %*d\t "
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"%*d\t\t%*d\t\t %*d\t %*d\t\t %*d", &cur);
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/* 70 is the max of /proc/net/wireless */
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return bprintf("%d", (int)((float)cur / 70 * 100));
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if (ifsock < 0)
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ifsock = socket(AF_UNIX, SOCK_DGRAM, 0);
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if (ifsock < 0) {
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warn("socket 'AF_UNIX':");
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return -1;
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}
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if (strcmp(ifr.ifr_name, interface) != 0) {
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strcpy(ifr.ifr_name, interface);
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if (ioctl(ifsock, SIOCGIFINDEX, &ifr) != 0) {
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warn("ioctl 'SIOCGIFINDEX':");
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return -1;
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}
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}
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return ifr.ifr_ifindex;
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}
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const char *
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wifi_essid(const char *interface)
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{
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static char id[IW_ESSID_MAX_SIZE+1];
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int sockfd;
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struct iwreq wreq;
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memset(&wreq, 0, sizeof(struct iwreq));
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wreq.u.essid.length = IW_ESSID_MAX_SIZE+1;
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if (esnprintf(wreq.ifr_name, sizeof(wreq.ifr_name), "%s",
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interface) < 0)
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return NULL;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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warn("socket 'AF_INET':");
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uint16_t fam = nl80211fam();
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ssize_t r;
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size_t len;
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char req[NLMSG_HDRLEN+GENL_HDRLEN+NLA_HDRLEN+NLA_ALIGN(4)] = {0}, *p = req;
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int idx = ifindex(interface);
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if (!fam) {
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fprintf(stderr, "nl80211 family not found\n");
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return NULL;
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}
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wreq.u.essid.pointer = id;
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if (ioctl(sockfd,SIOCGIWESSID, &wreq) < 0) {
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warn("ioctl 'SIOCGIWESSID':");
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close(sockfd);
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if (idx < 0) {
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fprintf(stderr, "interface %s not found\n", interface);
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return NULL;
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}
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close(sockfd);
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memcpy(p, &(struct nlmsghdr){
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.nlmsg_len = sizeof(req),
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.nlmsg_type = fam,
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.nlmsg_flags = NLM_F_REQUEST,
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.nlmsg_seq = seq++,
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.nlmsg_pid = 0,
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}, sizeof(struct nlmsghdr));
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p += NLMSG_HDRLEN;
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memcpy(p, &(struct genlmsghdr){
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.cmd = NL80211_CMD_GET_INTERFACE,
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.version = 1,
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}, sizeof(struct genlmsghdr));
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p += GENL_HDRLEN;
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memcpy(p, &(struct nlattr){
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.nla_len = NLA_HDRLEN+4,
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.nla_type = NL80211_ATTR_IFINDEX,
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}, sizeof(struct nlattr));
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p += NLA_HDRLEN;
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memcpy(p, &(uint32_t){idx}, 4);
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if (!strcmp(id, ""))
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if (send(nlsock, req, sizeof(req), 0) != sizeof(req)) {
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warn("send 'AF_NETLINK':");
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return NULL;
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}
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r = recv(nlsock, resp, sizeof(resp), 0);
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if (r < 0) {
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warn("recv 'AF_NETLINK':");
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return NULL;
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}
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return id;
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if ((size_t)r <= NLMSG_HDRLEN+GENL_HDRLEN)
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return NULL;
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p = findattr(NL80211_ATTR_SSID, resp+NLMSG_HDRLEN+GENL_HDRLEN, resp+r, &len);
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if (p)
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p[len] = 0;
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return p;
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}
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const char *
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wifi_perc(const char *interface)
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{
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static char strength[4];
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struct nlmsghdr hdr;
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uint16_t fam = nl80211fam();
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ssize_t r;
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size_t len;
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char req[NLMSG_HDRLEN+GENL_HDRLEN+NLA_HDRLEN+NLA_ALIGN(4)] = {0}, *p = req, *e;
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int idx = ifindex(interface);
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if (idx < 0) {
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fprintf(stderr, "interface %s not found\n", interface);
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return NULL;
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}
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memcpy(p, &(struct nlmsghdr){
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.nlmsg_len = sizeof(req),
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.nlmsg_type = fam,
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.nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP,
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.nlmsg_seq = seq++,
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.nlmsg_pid = 0,
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}, sizeof(struct nlmsghdr));
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p += NLMSG_HDRLEN;
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memcpy(p, &(struct genlmsghdr){
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.cmd = NL80211_CMD_GET_STATION,
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.version = 1,
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}, sizeof(struct genlmsghdr));
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p += GENL_HDRLEN;
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memcpy(p, &(struct nlattr){
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.nla_len = NLA_HDRLEN+4,
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.nla_type = NL80211_ATTR_IFINDEX,
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}, sizeof(struct nlattr));
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p += NLA_HDRLEN;
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memcpy(p, &(uint32_t){idx}, 4);
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if (send(nlsock, req, sizeof(req), 0) != sizeof(req)) {
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warn("send 'AF_NETLINK':");
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return NULL;
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}
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*strength = 0;
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while (1) {
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r = recv(nlsock, resp, sizeof(resp), 0);
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if (r < 0) {
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warn("recv 'AF_NETLINK':");
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return NULL;
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}
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if ((size_t)r < sizeof(hdr))
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return NULL;
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for (p = resp; p != resp+r && (size_t)(resp+r-p) >= sizeof(hdr); p = e) {
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memcpy(&hdr, p, sizeof(hdr));
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e = resp+r-p<hdr.nlmsg_len?resp+r:p+hdr.nlmsg_len;
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if (!*strength && hdr.nlmsg_len > NLMSG_HDRLEN+GENL_HDRLEN) {
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p += NLMSG_HDRLEN+GENL_HDRLEN;
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p = findattr(NL80211_ATTR_STA_INFO, p, e, &len);
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if (p)
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p = findattr(NL80211_STA_INFO_SIGNAL_AVG, p, e, &len);
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if (p && len == 1)
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snprintf(strength, sizeof(strength), "%d", RSSI_TO_PERC(*p));
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}
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if (hdr.nlmsg_type == NLMSG_DONE)
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return *strength?strength:NULL;
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}
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}
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}
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#elif defined(__OpenBSD__)
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#include <net/if.h>
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