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#include "global.h"
#include "dwds.h"


static inline int
wifi_getParent(const char *csVAP, char *psParent, size_t plen)
{
	char szOID[STRSIZ] = { 0 };

	FTRACE(5);

	assert(csVAP);
	assert(psParent);

	memset(psParent, 0, plen);
	snprintf(szOID, STRSIZ, "net.wlan.%s.%%parent", csVAP + 4);
	if (sysctlbyname(szOID, psParent, &plen, NULL, 0) == -1) {
//		syslog(LOG_ERR, "Error:: can`t get parent #%d - %s\n", errno, strerror(errno));
		return -1;
	} else
		psParent[plen] = 0;

	return 0;
}

inline int
wifi_chkIface(const char *csVAP, char **ppsIF, int nIF)
{
	char szParent[IFNAMSIZ];
	register int i;

	FTRACE(5);

	assert(csVAP);

	if (wifi_getParent(csVAP, szParent, IFNAMSIZ) == -1)
		return 0;

	for (i = 0; i < nIF; i++)
		if (!strcasecmp(ppsIF[i], "any") || !strcmp(ppsIF[i], szParent))
			return 1; /* OK, vap is child */

	VERB(2) syslog(LOG_ERR, "Error:: Interface %s parent %s not being monitored", csVAP, szParent);
	return 0;
}

static inline int
wifi_isWDS(int fd, const char *csVAP)
{
	struct ifmediareq ifmr;

	FTRACE(5);

	assert(csVAP);

	memset(&ifmr, 0, sizeof ifmr);
	strlcpy(ifmr.ifm_name, csVAP, sizeof ifmr.ifm_name);
	if (ioctl(fd, SIOCGIFMEDIA, &ifmr) == -1) {
		syslog(LOG_ERR, "Error:: can`t get media for %s #%d - %s\n", csVAP, 
				errno, strerror(errno));
		return -1;
	}

	return (ifmr.ifm_current & IFM_IEEE80211_WDS) != 0;
}

static inline int
wifi_getBSSID(int fd, const char *csVAP, uint8_t *psBSSID, int len)
{
	struct ieee80211req ireq;

	FTRACE(5);

	assert(csVAP);
	assert(psBSSID);

	memset(&ireq, 0, sizeof ireq);
	strlcpy(ireq.i_name, csVAP, sizeof ireq.i_name);
	ireq.i_type = IEEE80211_IOC_BSSID;
	ireq.i_data = psBSSID;
	ireq.i_len = len;
	if (ioctl(fd, SIOCG80211, &ireq) == -1) {
		syslog(LOG_ERR, "Error:: can`t get BSSID for %s #%d - %s\n", csVAP, 
				errno, strerror(errno));
		return -1;
	}

	return 0;
}

struct dwds_if *
wifi_buildWDS(int fd, char **ppsIF, int nIF)
{
	struct dwds_if *p, *wds = NULL;
	char szVAP[IFNAMSIZ];
	struct ether_addr bssid;
	register int i;

	FTRACE(5);

	for (i = 0; i < 128; i++) {
		memset(szVAP, 0, IFNAMSIZ);
		snprintf(szVAP, IFNAMSIZ, "wlan%d", i);
		if (wifi_chkIface(szVAP, ppsIF, nIF) && !wifi_isWDS(fd, szVAP)) {
			p = malloc(sizeof(struct dwds_if));
			if (!p) {
				syslog(LOG_ERR, "Error:: can`t allocate memory #%d - %s\n", 
						errno, strerror(errno));
				i = -1;
				break;
			}
			strlcpy(p->if_name, szVAP, IFNAMSIZ);
			if (wifi_getBSSID(fd, szVAP, p->if_bssid, IEEE80211_ADDR_LEN) == -1) {
				syslog(LOG_ERR, "Error:: can`t get BSSID #%d - %s\n", 
						errno, strerror(errno));
				i = -1;
				break;
			}
			p->if_next = wds;
			wds = p;

			memcpy(&bssid, p->if_bssid, ETHER_ADDR_LEN);
			syslog(LOG_INFO, "BSSID:%s discover WDS vap %s\n", ether_ntoa(&bssid), szVAP);
		}
	}

	if (i == -1)
		while ((p = wds)) {
			wds = wds->if_next;
			free(p);
		}

	return wds;
}

inline int
wifi_destroyWDS(const char *csIface, struct dwds_if **wds)
{
	struct dwds_if *p, **pp;

	FTRACE(5);

	assert(csIface);
	assert(wds);

	for (pp = wds; (p = *pp); pp = &p->if_next)
		if (!strncmp(p->if_name, csIface, IFNAMSIZ))
			break;
	if (p) {
		*pp = p->if_next;
		free(p);
		return 0;
	}

	return 1;
}

static int
wifi_vapDestroy(const char *csVAP)
{
	struct ieee80211req ifr;
	int s;

	FTRACE(5);

	assert(csVAP);

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s == -1) {
		syslog(LOG_ERR, "Error:: destroy socket(vap) %m\n");
		return -1;
	}

	memset(&ifr, 0, sizeof ifr);
	strlcpy(ifr.i_name, csVAP, IFNAMSIZ);
	if (ioctl(s, SIOCIFDESTROY, &ifr) == -1) {
		syslog(LOG_ERR, "Error:: destroy ioctl(vap) %m\n");
		close(s);
		return -1;
	} else
		close(s);

	return 0;
}

inline int
wifi_leaveWDS(struct ether_addr bssid, struct dwds_if **wds, char *psVAP, int vapLen)
{
	struct dwds_if *p, **pp;

	FTRACE(5);

	assert(wds);
	assert(psVAP);

	for (pp = wds; (p = *pp); pp = &p->if_next)
		if (!memcmp(p->if_bssid, &bssid, IEEE80211_ADDR_LEN))
			break;
	if (p) {
		*pp = p->if_next;
		strlcpy(psVAP, p->if_name, vapLen);
		if (wifi_vapDestroy(p->if_name) != -1)
		       VERB(1) syslog(LOG_INFO, "BSSID:%s WDS VAP %s destroyed\n", 
				       ether_ntoa(&bssid), p->if_name);	
		free(p);
		return 0;
	}

	return 1;
}

static int
wifi_vapCreate(const char *csIface, struct dwds_if *p)
{
	struct ieee80211_clone_params cp;
	struct ifreq ifr;
	struct ether_addr bssid;
	int s;

	FTRACE(5);

	assert(csIface);
	assert(p);

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (s == -1) {
		syslog(LOG_ERR, "Error:: create socket(vap) %m\n");
		return -1;
	}

	memset(&cp, 0, sizeof cp);
	strlcpy(cp.icp_parent, csIface, IFNAMSIZ);
	cp.icp_opmode = IEEE80211_M_WDS;
	memcpy(cp.icp_bssid, p->if_bssid, IEEE80211_ADDR_LEN);

	memset(&ifr, 0, sizeof ifr);
	strlcpy(ifr.ifr_name, "wlan", IFNAMSIZ);
	ifr.ifr_data = (void *) &cp;

	if (ioctl(s, SIOCIFCREATE2, &ifr) == -1) {
		memcpy(&bssid, cp.icp_bssid, IEEE80211_ADDR_LEN);
		syslog(LOG_ERR, "Error:: create ioctl(vap) mode %u flags 0x%x parent %s bssid %s %m\n", 
				cp.icp_opmode, cp.icp_flags, cp.icp_parent, ether_ntoa(&bssid));
		close(s);
		return -1;
	} else {
		strlcpy(p->if_name, ifr.ifr_name, IFNAMSIZ);
		close(s);
	}

	return 0;
}

inline int
wifi_createWDS(const char *csIface, struct ether_addr bssid, struct dwds_if **wds)
{
	struct dwds_if *p;
	char szParent[IFNAMSIZ];

	FTRACE(5);

	assert(csIface);
	assert(wds);

	for (p = *wds; p; p = p->if_next)
		if (!memcmp(p->if_bssid, &bssid, IEEE80211_ADDR_LEN)) {
			VERB(1) syslog(LOG_INFO, "BSSID:%s WDS VAP already created (%s)\n",
			    ether_ntoa(&bssid), csIface);
			return 1;
		}
	if (wifi_getParent(csIface, szParent, IFNAMSIZ) == -1) {
		syslog(LOG_ERR, "Error:: %s no pointer to parent interface\n", csIface);
		return -1;
	}

	p = malloc(sizeof(struct dwds_if));
	if (!p) {
		syslog(LOG_ERR, "Error:: malloc failed: %m\n");
		return -1;
	} else
		memcpy(p->if_bssid, &bssid, IEEE80211_ADDR_LEN);
	if (wifi_vapCreate(szParent, p) == -1) {
		free(p);
		return -1;
	} else {
		p->if_next = *wds;
		*wds = p;
		VERB(1) syslog(LOG_INFO, "BSSID:%s create WDS VAP %s\n", ether_ntoa(&bssid), p->if_name);
	}

	return 0;
}