/*
 * WPA Supplicant / Control interface (shared code for all backends)
 * Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"

#include "common.h"
#include "eloop.h"
#include "wpa.h"
#include "wpa_supplicant.h"
#include "config.h"
#include "eapol_sm.h"
#include "wpa_supplicant_i.h"
#include "ctrl_iface.h"
#include "l2_packet.h"
#include "preauth.h"
#include "pmksa_cache.h"
#include "wpa_ctrl.h"
#include "eap.h"


static int wpa_supplicant_global_iface_interfaces(struct wpa_global *global,
						  char *buf, int len);


static int wpa_supplicant_ctrl_iface_set(struct wpa_supplicant *wpa_s,
					 char *cmd)
{
	char *value;
	int ret = 0;

	value = os_strchr(cmd, ' ');
	if (value == NULL)
		return -1;
	*value++ = '\0';

	wpa_printf(MSG_DEBUG, "CTRL_IFACE SET '%s'='%s'", cmd, value);
	if (os_strcasecmp(cmd, "EAPOL::heldPeriod") == 0) {
		eapol_sm_configure(wpa_s->eapol,
				   atoi(value), -1, -1, -1);
	} else if (os_strcasecmp(cmd, "EAPOL::authPeriod") == 0) {
		eapol_sm_configure(wpa_s->eapol,
				   -1, atoi(value), -1, -1);
	} else if (os_strcasecmp(cmd, "EAPOL::startPeriod") == 0) {
		eapol_sm_configure(wpa_s->eapol,
				   -1, -1, atoi(value), -1);
	} else if (os_strcasecmp(cmd, "EAPOL::maxStart") == 0) {
		eapol_sm_configure(wpa_s->eapol,
				   -1, -1, -1, atoi(value));
	} else if (os_strcasecmp(cmd, "dot11RSNAConfigPMKLifetime") == 0) {
		if (wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_LIFETIME,
				     atoi(value)))
			ret = -1;
	} else if (os_strcasecmp(cmd, "dot11RSNAConfigPMKReauthThreshold") ==
		   0) {
		if (wpa_sm_set_param(wpa_s->wpa, RSNA_PMK_REAUTH_THRESHOLD,
				     atoi(value)))
			ret = -1;
	} else if (os_strcasecmp(cmd, "dot11RSNAConfigSATimeout") == 0) {
		if (wpa_sm_set_param(wpa_s->wpa, RSNA_SA_TIMEOUT, atoi(value)))
			ret = -1;
	} else
		ret = -1;

	return ret;
}


#ifdef IEEE8021X_EAPOL
static int wpa_supplicant_ctrl_iface_preauth(struct wpa_supplicant *wpa_s,
					     char *addr)
{
	u8 bssid[ETH_ALEN];

	if (hwaddr_aton(addr, bssid)) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE PREAUTH: invalid address "
			   "'%s'", addr);
		return -1;
	}

	wpa_printf(MSG_DEBUG, "CTRL_IFACE PREAUTH " MACSTR, MAC2STR(bssid));
	rsn_preauth_deinit(wpa_s->wpa);
	if (rsn_preauth_init(wpa_s->wpa, bssid, wpa_s->current_ssid))
		return -1;

	return 0;
}
#endif /* IEEE8021X_EAPOL */


#ifdef CONFIG_PEERKEY
/* MLME-STKSTART.request(peer) */
static int wpa_supplicant_ctrl_iface_stkstart(
	struct wpa_supplicant *wpa_s, char *addr)
{
	u8 peer[ETH_ALEN];

	if (hwaddr_aton(addr, peer)) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE STKSTART: invalid "
			   "address '%s'", peer);
		return -1;
	}

	wpa_printf(MSG_DEBUG, "CTRL_IFACE STKSTART " MACSTR,
		   MAC2STR(peer));

	return wpa_sm_stkstart(wpa_s->wpa, peer);
}
#endif /* CONFIG_PEERKEY */


static int wpa_supplicant_ctrl_iface_ctrl_rsp(struct wpa_supplicant *wpa_s,
					      char *rsp)
{
#ifdef IEEE8021X_EAPOL
	char *pos, *id_pos;
	int id;
	struct wpa_ssid *ssid;

	pos = os_strchr(rsp, '-');
	if (pos == NULL)
		return -1;
	*pos++ = '\0';
	id_pos = pos;
	pos = os_strchr(pos, ':');
	if (pos == NULL)
		return -1;
	*pos++ = '\0';
	id = atoi(id_pos);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: field=%s id=%d", rsp, id);
	wpa_hexdump_ascii_key(MSG_DEBUG, "CTRL_IFACE: value",
			      (u8 *) pos, os_strlen(pos));

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find SSID id=%d "
			   "to update", id);
		return -1;
	}

	if (os_strcmp(rsp, "IDENTITY") == 0) {
		os_free(ssid->identity);
		ssid->identity = (u8 *) os_strdup(pos);
		ssid->identity_len = os_strlen(pos);
		ssid->pending_req_identity = 0;
		if (ssid == wpa_s->current_ssid)
			wpa_s->reassociate = 1;
	} else if (os_strcmp(rsp, "PASSWORD") == 0) {
		os_free(ssid->password);
		ssid->password = (u8 *) os_strdup(pos);
		ssid->password_len = os_strlen(pos);
		ssid->pending_req_password = 0;
		if (ssid == wpa_s->current_ssid)
			wpa_s->reassociate = 1;
	} else if (os_strcmp(rsp, "NEW_PASSWORD") == 0) {
		os_free(ssid->new_password);
		ssid->new_password = (u8 *) os_strdup(pos);
		ssid->new_password_len = os_strlen(pos);
		ssid->pending_req_new_password = 0;
		if (ssid == wpa_s->current_ssid)
			wpa_s->reassociate = 1;
	} else if (os_strcmp(rsp, "PIN") == 0) {
		os_free(ssid->pin);
		ssid->pin = os_strdup(pos);
		ssid->pending_req_pin = 0;
		if (ssid == wpa_s->current_ssid)
			wpa_s->reassociate = 1;
	} else if (os_strcmp(rsp, "OTP") == 0) {
		os_free(ssid->otp);
		ssid->otp = (u8 *) os_strdup(pos);
		ssid->otp_len = os_strlen(pos);
		os_free(ssid->pending_req_otp);
		ssid->pending_req_otp = NULL;
		ssid->pending_req_otp_len = 0;
	} else if (os_strcmp(rsp, "PASSPHRASE") == 0) {
		os_free(ssid->private_key_passwd);
		ssid->private_key_passwd = (u8 *) os_strdup(pos);
		ssid->pending_req_passphrase = 0;
		if (ssid == wpa_s->current_ssid)
			wpa_s->reassociate = 1;
	} else {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Unknown field '%s'", rsp);
		return -1;
	}

	return 0;
#else /* IEEE8021X_EAPOL */
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: 802.1X not included");
	return -1;
#endif /* IEEE8021X_EAPOL */
}


static int wpa_supplicant_ctrl_iface_status(struct wpa_supplicant *wpa_s,
					    const char *params,
					    char *buf, size_t buflen)
{
	char *pos, *end, tmp[30];
	int res, verbose, ret;

	verbose = os_strcmp(params, "-VERBOSE") == 0;
	pos = buf;
	end = buf + buflen;
	if (wpa_s->wpa_state >= WPA_ASSOCIATED) {
		struct wpa_ssid *ssid = wpa_s->current_ssid;
		ret = os_snprintf(pos, end - pos, "bssid=" MACSTR "\n",
				  MAC2STR(wpa_s->bssid));
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		if (ssid) {
			u8 *_ssid = ssid->ssid;
			size_t ssid_len = ssid->ssid_len;
			u8 ssid_buf[MAX_SSID_LEN];
			if (ssid_len == 0) {
				int _res = wpa_drv_get_ssid(wpa_s, ssid_buf);
				if (_res < 0)
					ssid_len = 0;
				else
					ssid_len = _res;
				_ssid = ssid_buf;
			}
			ret = os_snprintf(pos, end - pos, "ssid=%s\nid=%d\n",
					  wpa_ssid_txt(_ssid, ssid_len),
					  ssid->id);
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;

			if (ssid->id_str) {
				ret = os_snprintf(pos, end - pos,
						  "id_str=%s\n",
						  ssid->id_str);
				if (ret < 0 || ret >= end - pos)
					return pos - buf;
				pos += ret;
			}
		}

		pos += wpa_sm_get_status(wpa_s->wpa, pos, end - pos, verbose);
	}
	ret = os_snprintf(pos, end - pos, "wpa_state=%s\n",
			  wpa_supplicant_state_txt(wpa_s->wpa_state));
	if (ret < 0 || ret >= end - pos)
		return pos - buf;
	pos += ret;

	if (wpa_s->l2 &&
	    l2_packet_get_ip_addr(wpa_s->l2, tmp, sizeof(tmp)) >= 0) {
		ret = os_snprintf(pos, end - pos, "ip_address=%s\n", tmp);
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
	}

	if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X ||
	    wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
		res = eapol_sm_get_status(wpa_s->eapol, pos, end - pos,
					  verbose);
		if (res >= 0)
			pos += res;
	}

	res = rsn_preauth_get_status(wpa_s->wpa, pos, end - pos, verbose);
	if (res >= 0)
		pos += res;

	return pos - buf;
}


static int wpa_supplicant_ctrl_iface_bssid(struct wpa_supplicant *wpa_s,
					   char *cmd)
{
	char *pos;
	int id;
	struct wpa_ssid *ssid;
	u8 bssid[ETH_ALEN];

	/* cmd: "<network id> <BSSID>" */
	pos = os_strchr(cmd, ' ');
	if (pos == NULL)
		return -1;
	*pos++ = '\0';
	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: id=%d bssid='%s'", id, pos);
	if (hwaddr_aton(pos, bssid)) {
		wpa_printf(MSG_DEBUG ,"CTRL_IFACE: invalid BSSID '%s'", pos);
		return -1;
	}

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find SSID id=%d "
			   "to update", id);
		return -1;
	}

	os_memcpy(ssid->bssid, bssid, ETH_ALEN);
	ssid->bssid_set =
		os_memcmp(bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) != 0;
		

	return 0;
}

#ifdef ANDROID
static int wpa_supplicant_ctrl_iface_blacklist(
		struct wpa_supplicant *wpa_s, char *cmd, char *buf, size_t buflen)
{
	struct wpa_ssid *ssid;
	u8 bssid[ETH_ALEN];
	struct wpa_blacklist *e;
	char *pos, *end;
	int ret;

	/* cmd: "BLACKLIST [<BSSID>]" */
	if (*cmd == '\0') {
		pos = buf;
		end = buf + buflen;

		e = wpa_s->blacklist;
		while (e) {
			ret = os_snprintf(pos, end-pos,
					  "%02x:%02x:%02x:%02x:%02x:%02x\n",
					  e->bssid[0],
					  e->bssid[1],
					  e->bssid[2],
					  e->bssid[3],
					  e->bssid[4],
					  e->bssid[5]);
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			e = e->next;
		}
		return pos - buf;
	}
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: bssid='%s'", cmd);

	++cmd;
	if (os_strncmp(cmd, "clear", 5) == 0) {
		wpa_blacklist_clear(wpa_s);
		return 0;
	}

	if (hwaddr_aton(cmd, bssid)) {
		wpa_printf(MSG_DEBUG ,"CTRL_IFACE: invalid BSSID '%s'", cmd);
		return -1;
	}

	/*
	 * Add the BSSID twice, so its count will be 2, causing it to be
	 * skipped when processing scan results.
	 */
	ret = wpa_blacklist_add(wpa_s, bssid);
	if (ret != 0)
		return ret;
	return wpa_blacklist_add(wpa_s, bssid);
}
#endif

static int wpa_supplicant_ctrl_iface_list_networks(
	struct wpa_supplicant *wpa_s, char *buf, size_t buflen)
{
	char *pos, *end;
	struct wpa_ssid *ssid;
	int ret;

	pos = buf;
	end = buf + buflen;
	ret = os_snprintf(pos, end - pos,
			  "network id / ssid / bssid / flags\n");
	if (ret < 0 || ret >= end - pos)
		return pos - buf;
	pos += ret;

	ssid = wpa_s->conf->ssid;
	while (ssid) {
		ret = os_snprintf(pos, end - pos, "%d\t%s",
				  ssid->id,
				  wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		if (ssid->bssid_set) {
			ret = os_snprintf(pos, end - pos, "\t" MACSTR,
					  MAC2STR(ssid->bssid));
		} else {
			ret = os_snprintf(pos, end - pos, "\tany");
		}
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		ret = os_snprintf(pos, end - pos, "\t%s%s",
				  ssid == wpa_s->current_ssid ?
				  "[CURRENT]" : "",
				  ssid->disabled ? "[DISABLED]" : "");
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;
		ret = os_snprintf(pos, end - pos, "\n");
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;

		ssid = ssid->next;
	}

	return pos - buf;
}


static char * wpa_supplicant_cipher_txt(char *pos, char *end, int cipher)
{
	int first = 1, ret;
	ret = os_snprintf(pos, end - pos, "-");
	if (ret < 0 || ret >= end - pos)
		return pos;
	pos += ret;
	if (cipher & WPA_CIPHER_NONE) {
		ret = os_snprintf(pos, end - pos, "%sNONE", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	if (cipher & WPA_CIPHER_WEP40) {
		ret = os_snprintf(pos, end - pos, "%sWEP40", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	if (cipher & WPA_CIPHER_WEP104) {
		ret = os_snprintf(pos, end - pos, "%sWEP104",
				  first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	if (cipher & WPA_CIPHER_TKIP) {
		ret = os_snprintf(pos, end - pos, "%sTKIP", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	if (cipher & WPA_CIPHER_CCMP) {
		ret = os_snprintf(pos, end - pos, "%sCCMP", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	return pos;
}


static char * wpa_supplicant_ie_txt(char *pos, char *end, const char *proto,
				    const u8 *ie, size_t ie_len)
{
	struct wpa_ie_data data;
	int first, ret;

	ret = os_snprintf(pos, end - pos, "[%s-", proto);
	if (ret < 0 || ret >= end - pos)
		return pos;
	pos += ret;

	if (wpa_parse_wpa_ie(ie, ie_len, &data) < 0) {
		ret = os_snprintf(pos, end - pos, "?]");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		return pos;
	}

	first = 1;
	if (data.key_mgmt & WPA_KEY_MGMT_IEEE8021X) {
		ret = os_snprintf(pos, end - pos, "%sEAP", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	if (data.key_mgmt & WPA_KEY_MGMT_PSK) {
		ret = os_snprintf(pos, end - pos, "%sPSK", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}
	if (data.key_mgmt & WPA_KEY_MGMT_WPA_NONE) {
		ret = os_snprintf(pos, end - pos, "%sNone", first ? "" : "+");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
		first = 0;
	}

	pos = wpa_supplicant_cipher_txt(pos, end, data.pairwise_cipher);

	if (data.capabilities & WPA_CAPABILITY_PREAUTH) {
		ret = os_snprintf(pos, end - pos, "-preauth");
		if (ret < 0 || ret >= end - pos)
			return pos;
		pos += ret;
	}

	ret = os_snprintf(pos, end - pos, "]");
	if (ret < 0 || ret >= end - pos)
		return pos;
	pos += ret;

	return pos;
}


static int wpa_supplicant_ctrl_iface_scan_results(
	struct wpa_supplicant *wpa_s, char *buf, size_t buflen)
{
	char *pos, *end, *retpos;
	struct wpa_scan_result *res;
	int i, ret;

	if (wpa_s->scan_results == NULL &&
	    wpa_supplicant_get_scan_results(wpa_s) < 0)
		return 0;
	if (wpa_s->scan_results == NULL)
		return 0;

	pos = buf;
	end = buf + buflen;
	ret = os_snprintf(pos, end - pos, "bssid / frequency / signal level / "
			  "flags / ssid\n");
	if (ret < 0 || ret >= end - pos)
		return pos - buf;
	pos += ret;

	for (i = 0; i < wpa_s->num_scan_results; i++) {
		retpos = pos;
		res = &wpa_s->scan_results[i];
		ret = os_snprintf(pos, end - pos, MACSTR "\t%d\t%d\t",
				  MAC2STR(res->bssid), res->freq, res->level);
		if (ret < 0 || ret >= end - pos)
			return retpos - buf;
		pos += ret;
		if (res->wpa_ie_len) {
			pos = wpa_supplicant_ie_txt(pos, end, "WPA",
						    res->wpa_ie,
						    res->wpa_ie_len);
		}
		if (res->rsn_ie_len) {
			pos = wpa_supplicant_ie_txt(pos, end, "WPA2",
						    res->rsn_ie,
						    res->rsn_ie_len);
		}
		if (!res->wpa_ie_len && !res->rsn_ie_len &&
		    res->caps & IEEE80211_CAP_PRIVACY) {
			ret = os_snprintf(pos, end - pos, "[WEP]");
			if (ret < 0 || ret >= end - pos)
				return retpos - buf;
			pos += ret;
		}
		if (res->caps & IEEE80211_CAP_IBSS) {
			ret = os_snprintf(pos, end - pos, "[IBSS]");
			if (ret < 0 || ret >= end - pos)
				return retpos - buf;
			pos += ret;
		}
		if (!res->wpa_ie_len && !res->rsn_ie_len) {
			ret = os_snprintf(pos, end - pos, "\t");
			if (ret < 0 || ret >= end - pos)
				return retpos - buf;
			pos += ret;
		}

		ret = os_snprintf(pos, end - pos, "\t%s",
				  wpa_ssid_txt(res->ssid, res->ssid_len));
		if (ret < 0 || ret >= end - pos)
			return retpos - buf;
		pos += ret;

		ret = os_snprintf(pos, end - pos, "\n");
		if (ret < 0 || ret >= end - pos)
			return retpos - buf;
		pos += ret;
	}

	return pos - buf;
}


static int wpa_supplicant_ctrl_iface_select_network(
	struct wpa_supplicant *wpa_s, char *cmd)
{
	int id;
	struct wpa_ssid *ssid;

	/* cmd: "<network id>" or "any" */
	if (os_strcmp(cmd, "any") == 0) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: SELECT_NETWORK any");
		ssid = wpa_s->conf->ssid;
		while (ssid) {
			ssid->disabled = 0;
			ssid = ssid->next;
		}
		wpa_s->reassociate = 1;
		wpa_supplicant_req_scan(wpa_s, 0, 0);
		return 0;
	}

	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: SELECT_NETWORK id=%d", id);

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find network "
			   "id=%d", id);
		return -1;
	}

	if (ssid != wpa_s->current_ssid && wpa_s->current_ssid)
		wpa_supplicant_disassociate(wpa_s, REASON_DEAUTH_LEAVING);

	/* Mark all other networks disabled and trigger reassociation */
	ssid = wpa_s->conf->ssid;
	while (ssid) {
		ssid->disabled = id != ssid->id;
		ssid = ssid->next;
	}
	wpa_s->reassociate = 1;
	wpa_supplicant_req_scan(wpa_s, 0, 0);

	return 0;
}


static int wpa_supplicant_ctrl_iface_enable_network(
	struct wpa_supplicant *wpa_s, char *cmd)
{
	int id;
	struct wpa_ssid *ssid;

	/* cmd: "<network id>" */
	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: ENABLE_NETWORK id=%d", id);

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find network "
			   "id=%d", id);
		return -1;
	}

	if (wpa_s->current_ssid == NULL && ssid->disabled) {
		/*
		 * Try to reassociate since there is no current configuration
		 * and a new network was made available. */
		wpa_s->reassociate = 1;
		wpa_supplicant_req_scan(wpa_s, 0, 0);
	}
	ssid->disabled = 0;

	return 0;
}


static int wpa_supplicant_ctrl_iface_disable_network(
	struct wpa_supplicant *wpa_s, char *cmd)
{
	int id;
	struct wpa_ssid *ssid;

	/* cmd: "<network id>" */
	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: DISABLE_NETWORK id=%d", id);

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find network "
			   "id=%d", id);
		return -1;
	}

	if (ssid == wpa_s->current_ssid)
		wpa_supplicant_disassociate(wpa_s, REASON_DEAUTH_LEAVING);
	ssid->disabled = 1;

	return 0;
}


static int wpa_supplicant_ctrl_iface_add_network(
	struct wpa_supplicant *wpa_s, char *buf, size_t buflen)
{
	struct wpa_ssid *ssid;
	int ret;

	wpa_printf(MSG_DEBUG, "CTRL_IFACE: ADD_NETWORK");

	ssid = wpa_config_add_network(wpa_s->conf);
	if (ssid == NULL)
		return -1;
	ssid->disabled = 1;
	wpa_config_set_network_defaults(ssid);

	ret = os_snprintf(buf, buflen, "%d\n", ssid->id);
	if (ret < 0 || (size_t) ret >= buflen)
		return -1;
	return ret;
}


static int wpa_supplicant_ctrl_iface_remove_network(
	struct wpa_supplicant *wpa_s, char *cmd)
{
	int id;
	struct wpa_ssid *ssid;

	/* cmd: "<network id>" */
	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: REMOVE_NETWORK id=%d", id);

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL ||
	    wpa_config_remove_network(wpa_s->conf, id) < 0) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find network "
			   "id=%d", id);
		return -1;
	}

	if (ssid == wpa_s->current_ssid) {
		/*
		 * Invalidate the EAP session cache if the current network is
		 * removed.
		 */
		eapol_sm_invalidate_cached_session(wpa_s->eapol);

		wpa_supplicant_disassociate(wpa_s, REASON_DEAUTH_LEAVING);
	}

	return 0;
}


static int wpa_supplicant_ctrl_iface_set_network(
	struct wpa_supplicant *wpa_s, char *cmd)
{
	int id;
	struct wpa_ssid *ssid;
	char *name, *value;

	/* cmd: "<network id> <variable name> <value>" */
	name = os_strchr(cmd, ' ');
	if (name == NULL)
		return -1;
	*name++ = '\0';

	value = os_strchr(name, ' ');
	if (value == NULL)
		return -1;
	*value++ = '\0';

	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: SET_NETWORK id=%d name='%s'",
		   id, name);
	wpa_hexdump_ascii_key(MSG_DEBUG, "CTRL_IFACE: value",
			      (u8 *) value, os_strlen(value));

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find network "
			   "id=%d", id);
		return -1;
	}

	if (wpa_config_set(ssid, name, value, 0) < 0) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Failed to set network "
			   "variable '%s'", name);
		return -1;
	}

	if (wpa_s->current_ssid == ssid) {
		/*
		 * Invalidate the EAP session cache if anything in the current
		 * configuration changes.
		 */
		eapol_sm_invalidate_cached_session(wpa_s->eapol);
	}

	if ((os_strcmp(name, "psk") == 0 &&
	     value[0] == '"' && ssid->ssid_len) ||
	    (os_strcmp(name, "ssid") == 0 && ssid->passphrase))
		wpa_config_update_psk(ssid);

	return 0;
}


static int wpa_supplicant_ctrl_iface_get_network(
	struct wpa_supplicant *wpa_s, char *cmd, char *buf, size_t buflen)
{
	int id;
	struct wpa_ssid *ssid;
	char *name, *value;

	/* cmd: "<network id> <variable name>" */
	name = os_strchr(cmd, ' ');
	if (name == NULL || buflen == 0)
		return -1;
	*name++ = '\0';

	id = atoi(cmd);
	wpa_printf(MSG_DEBUG, "CTRL_IFACE: GET_NETWORK id=%d name='%s'",
		   id, name);

	ssid = wpa_config_get_network(wpa_s->conf, id);
	if (ssid == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Could not find network "
			   "id=%d", id);
		return -1;
	}

	value = wpa_config_get_no_key(ssid, name);
	if (value == NULL) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: Failed to get network "
			   "variable '%s'", name);
		return -1;
	}

	os_snprintf(buf, buflen, "%s", value);
	buf[buflen - 1] = '\0';

	os_free(value);

	return os_strlen(buf);
}


static int wpa_supplicant_ctrl_iface_save_config(struct wpa_supplicant *wpa_s)
{
	int ret;

	if (!wpa_s->conf->update_config) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: SAVE_CONFIG - Not allowed "
			   "to update configuration (update_config=0)");
		return -1;
	}

	ret = wpa_config_write(wpa_s->confname, wpa_s->conf);
	if (ret) {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: SAVE_CONFIG - Failed to "
			   "update configuration");
	} else {
		wpa_printf(MSG_DEBUG, "CTRL_IFACE: SAVE_CONFIG - Configuration"
			   " updated");
	}

	return ret;
}


static int wpa_supplicant_ctrl_iface_get_capability(
	struct wpa_supplicant *wpa_s, const char *_field, char *buf,
	size_t buflen)
{
	struct wpa_driver_capa capa;
	int res, first = 1, ret;
	char *pos, *end, *strict;
	char field[30];

	/* Determine whether or not strict checking was requested */
	os_snprintf(field, sizeof(field), "%s", _field);
	field[sizeof(field) - 1] = '\0';
	strict = os_strchr(field, ' ');
	if (strict != NULL) {
		*strict++ = '\0';
		if (os_strcmp(strict, "strict") != 0)
			return -1;
	}

	wpa_printf(MSG_DEBUG, "CTRL_IFACE: GET_CAPABILITY '%s' %s",
		field, strict ? strict : "");

	if (os_strcmp(field, "eap") == 0) {
		return eap_get_names(buf, buflen);
	}

	res = wpa_drv_get_capa(wpa_s, &capa);

	pos = buf;
	end = pos + buflen;

	if (os_strcmp(field, "pairwise") == 0) {
		if (res < 0) {
			if (strict)
				return 0;
			ret = os_snprintf(buf, buflen, "CCMP TKIP NONE");
			if (ret < 0 || (size_t) ret >= buflen)
				return -1;
			return ret;
		}

		if (capa.enc & WPA_DRIVER_CAPA_ENC_CCMP) {
			ret = os_snprintf(pos, end - pos, "%sCCMP",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.enc & WPA_DRIVER_CAPA_ENC_TKIP) {
			ret = os_snprintf(pos, end - pos, "%sTKIP",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.key_mgmt & WPA_DRIVER_CAPA_KEY_MGMT_WPA_NONE) {
			ret = os_snprintf(pos, end - pos, "%sNONE",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		return pos - buf;
	}

	if (os_strcmp(field, "group") == 0) {
		if (res < 0) {
			if (strict)
				return 0;
			ret = os_snprintf(buf, buflen,
					  "CCMP TKIP WEP104 WEP40");
			if (ret < 0 || (size_t) ret >= buflen)
				return -1;
			return ret;
		}

		if (capa.enc & WPA_DRIVER_CAPA_ENC_CCMP) {
			ret = os_snprintf(pos, end - pos, "%sCCMP",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.enc & WPA_DRIVER_CAPA_ENC_TKIP) {
			ret = os_snprintf(pos, end - pos, "%sTKIP",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.enc & WPA_DRIVER_CAPA_ENC_WEP104) {
			ret = os_snprintf(pos, end - pos, "%sWEP104",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.enc & WPA_DRIVER_CAPA_ENC_WEP40) {
			ret = os_snprintf(pos, end - pos, "%sWEP40",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		return pos - buf;
	}

	if (os_strcmp(field, "key_mgmt") == 0) {
		if (res < 0) {
			if (strict)
				return 0;
			ret = os_snprintf(buf, buflen, "WPA-PSK WPA-EAP "
					  "IEEE8021X WPA-NONE NONE");
			if (ret < 0 || (size_t) ret >= buflen)
				return -1;
			return ret;
		}

		ret = os_snprintf(pos, end - pos, "NONE IEEE8021X");
		if (ret < 0 || ret >= end - pos)
			return pos - buf;
		pos += ret;

		if (capa.key_mgmt & (WPA_DRIVER_CAPA_KEY_MGMT_WPA |
				     WPA_DRIVER_CAPA_KEY_MGMT_WPA2)) {
			ret = os_snprintf(pos, end - pos, " WPA-EAP");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
		}

		if (capa.key_mgmt & (WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK |
				     WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK)) {
			ret = os_snprintf(pos, end - pos, " WPA-PSK");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
		}

		if (capa.key_mgmt & WPA_DRIVER_CAPA_KEY_MGMT_WPA_NONE) {
			ret = os_snprintf(pos, end - pos, " WPA-NONE");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
		}

		return pos - buf;
	}

	if (os_strcmp(field, "proto") == 0) {
		if (res < 0) {
			if (strict)
				return 0;
			ret = os_snprintf(buf, buflen, "RSN WPA");
			if (ret < 0 || (size_t) ret >= buflen)
				return -1;
			return ret;
		}

		if (capa.key_mgmt & (WPA_DRIVER_CAPA_KEY_MGMT_WPA2 |
				     WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK)) {
			ret = os_snprintf(pos, end - pos, "%sRSN",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.key_mgmt & (WPA_DRIVER_CAPA_KEY_MGMT_WPA |
				     WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK)) {
			ret = os_snprintf(pos, end - pos, "%sWPA",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		return pos - buf;
	}

	if (os_strcmp(field, "auth_alg") == 0) {
		if (res < 0) {
			if (strict)
				return 0;
			ret = os_snprintf(buf, buflen, "OPEN SHARED LEAP");
			if (ret < 0 || (size_t) ret >= buflen)
				return -1;
			return ret;
		}

		if (capa.auth & (WPA_DRIVER_AUTH_OPEN)) {
			ret = os_snprintf(pos, end - pos, "%sOPEN",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.auth & (WPA_DRIVER_AUTH_SHARED)) {
			ret = os_snprintf(pos, end - pos, "%sSHARED",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		if (capa.auth & (WPA_DRIVER_AUTH_LEAP)) {
			ret = os_snprintf(pos, end - pos, "%sLEAP",
					  first ? "" : " ");
			if (ret < 0 || ret >= end - pos)
				return pos - buf;
			pos += ret;
			first = 0;
		}

		return pos - buf;
	}

	wpa_printf(MSG_DEBUG, "CTRL_IFACE: Unknown GET_CAPABILITY field '%s'",
		   field);

	return -1;
}


static int wpa_supplicant_ctrl_iface_ap_scan(
	struct wpa_supplicant *wpa_s, char *cmd)
{
	int ap_scan = atoi(cmd);

	if (ap_scan < 0 || ap_scan > 2)
		return -1;
	wpa_s->conf->ap_scan = ap_scan;
	return 0;
}

static int wpa_supplicant_driver_cmd(struct wpa_supplicant *wpa_s, 
                                     char *cmd, char *buf, size_t buflen)
{
    int ret;

    ret = wpa_drv_driver_cmd(wpa_s, cmd, buf, buflen);
    if( ret == 0 ) {
        ret = sprintf(buf, "%s\n", "OK");
    }
    return( ret );
}

char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
					 char *buf, size_t *resp_len)
{
	char *reply;
	const int reply_size = 4096;
	int ctrl_rsp = 0;
	int reply_len;

	if (os_strncmp(buf, WPA_CTRL_RSP, os_strlen(WPA_CTRL_RSP)) == 0 ||
	    os_strncmp(buf, "SET_NETWORK ", 12) == 0) {
		wpa_hexdump_ascii_key(MSG_DEBUG, "RX ctrl_iface",
				      (const u8 *) buf, os_strlen(buf));
	} else {
        if (os_strcmp(buf, "PING") != 0)
            wpa_hexdump_ascii(MSG_DEBUG, "RX ctrl_iface",
                              (const u8 *) buf, os_strlen(buf));
	}

	reply = os_malloc(reply_size);
	if (reply == NULL) {
		*resp_len = 1;
		return NULL;
	}

	os_memcpy(reply, "OK\n", 3);
	reply_len = 3;

	if (os_strcmp(buf, "PING") == 0) {
		os_memcpy(reply, "PONG\n", 5);
		reply_len = 5;
	} else if (os_strcmp(buf, "MIB") == 0) {
		reply_len = wpa_sm_get_mib(wpa_s->wpa, reply, reply_size);
		if (reply_len >= 0) {
			int res;
			res = eapol_sm_get_mib(wpa_s->eapol, reply + reply_len,
					       reply_size - reply_len);
			if (res < 0)
				reply_len = -1;
			else
				reply_len += res;
		}
	} else if (os_strncmp(buf, "STATUS", 6) == 0) {
		reply_len = wpa_supplicant_ctrl_iface_status(
			wpa_s, buf + 6, reply, reply_size);
	} else if (os_strcmp(buf, "PMKSA") == 0) {
		reply_len = pmksa_cache_list(wpa_s->wpa, reply, reply_size);
	} else if (os_strncmp(buf, "SET ", 4) == 0) {
		if (wpa_supplicant_ctrl_iface_set(wpa_s, buf + 4))
			reply_len = -1;
	} else if (os_strcmp(buf, "LOGON") == 0) {
		eapol_sm_notify_logoff(wpa_s->eapol, FALSE);
	} else if (os_strcmp(buf, "LOGOFF") == 0) {
		eapol_sm_notify_logoff(wpa_s->eapol, TRUE);
	} else if (os_strcmp(buf, "REASSOCIATE") == 0) {
		wpa_s->disconnected = 0;
		wpa_s->reassociate = 1;
		wpa_supplicant_req_scan(wpa_s, 0, 0);
	} else if (os_strcmp(buf, "RECONNECT") == 0) {
		if (wpa_s->disconnected) {
			wpa_s->disconnected = 0;
			wpa_s->reassociate = 1;
			wpa_supplicant_req_scan(wpa_s, 0, 0);
		}
#ifdef IEEE8021X_EAPOL
	} else if (os_strncmp(buf, "PREAUTH ", 8) == 0) {
		if (wpa_supplicant_ctrl_iface_preauth(wpa_s, buf + 8))
			reply_len = -1;
#endif /* IEEE8021X_EAPOL */
#ifdef CONFIG_PEERKEY
	} else if (os_strncmp(buf, "STKSTART ", 9) == 0) {
		if (wpa_supplicant_ctrl_iface_stkstart(wpa_s, buf + 9))
			reply_len = -1;
#endif /* CONFIG_PEERKEY */
	} else if (os_strncmp(buf, WPA_CTRL_RSP, os_strlen(WPA_CTRL_RSP)) == 0)
	{
		if (wpa_supplicant_ctrl_iface_ctrl_rsp(
			    wpa_s, buf + os_strlen(WPA_CTRL_RSP)))
			reply_len = -1;
		else
			ctrl_rsp = 1;
	} else if (os_strcmp(buf, "RECONFIGURE") == 0) {
		if (wpa_supplicant_reload_configuration(wpa_s))
			reply_len = -1;
	} else if (os_strcmp(buf, "TERMINATE") == 0) {
		eloop_terminate();
	} else if (os_strncmp(buf, "BSSID ", 6) == 0) {
		if (wpa_supplicant_ctrl_iface_bssid(wpa_s, buf + 6))
			reply_len = -1;
#ifdef ANDROID
	} else if (os_strncmp(buf, "BLACKLIST", 9) == 0) {
		reply_len = wpa_supplicant_ctrl_iface_blacklist(
				wpa_s, buf + 9, reply, reply_size);
		if (os_strlen(buf) > 10 && reply_len == 0) {
			struct wpa_blacklist *bl = wpa_s->blacklist;
			if (os_strncmp(buf+10, "clear", 5) == 0 ||
			    (bl != NULL && os_memcmp(bl->bssid, wpa_s->bssid, ETH_ALEN) == 0)) {
				wpa_s->disconnected = 0;
				wpa_s->reassociate = 1;
				wpa_supplicant_req_scan(wpa_s, 0, 0);
			}
		}
#endif
	} else if (os_strcmp(buf, "LIST_NETWORKS") == 0) {
		reply_len = wpa_supplicant_ctrl_iface_list_networks(
			wpa_s, reply, reply_size);
	} else if (os_strcmp(buf, "DISCONNECT") == 0) {
		wpa_s->reassociate = 0;
		wpa_s->disconnected = 1;
		wpa_supplicant_disassociate(wpa_s, REASON_DEAUTH_LEAVING);
	} else if (os_strcmp(buf, "SCAN") == 0) {
		wpa_s->scan_req = 2;
		wpa_supplicant_req_scan(wpa_s, 0, 0);
	} else if (os_strcmp(buf, "SCAN_RESULTS") == 0) {
		reply_len = wpa_supplicant_ctrl_iface_scan_results(
			wpa_s, reply, reply_size);
	} else if (os_strncmp(buf, "SELECT_NETWORK ", 15) == 0) {
		if (wpa_supplicant_ctrl_iface_select_network(wpa_s, buf + 15))
			reply_len = -1;
	} else if (os_strncmp(buf, "ENABLE_NETWORK ", 15) == 0) {
		if (wpa_supplicant_ctrl_iface_enable_network(wpa_s, buf + 15))
			reply_len = -1;
	} else if (os_strncmp(buf, "DISABLE_NETWORK ", 16) == 0) {
		if (wpa_supplicant_ctrl_iface_disable_network(wpa_s, buf + 16))
			reply_len = -1;
	} else if (os_strcmp(buf, "ADD_NETWORK") == 0) {
		reply_len = wpa_supplicant_ctrl_iface_add_network(
			wpa_s, reply, reply_size);
	} else if (os_strncmp(buf, "REMOVE_NETWORK ", 15) == 0) {
		if (wpa_supplicant_ctrl_iface_remove_network(wpa_s, buf + 15))
			reply_len = -1;
	} else if (os_strncmp(buf, "SET_NETWORK ", 12) == 0) {
		if (wpa_supplicant_ctrl_iface_set_network(wpa_s, buf + 12))
			reply_len = -1;
	} else if (os_strncmp(buf, "GET_NETWORK ", 12) == 0) {
		reply_len = wpa_supplicant_ctrl_iface_get_network(
			wpa_s, buf + 12, reply, reply_size);
	} else if (os_strcmp(buf, "SAVE_CONFIG") == 0) {
		if (wpa_supplicant_ctrl_iface_save_config(wpa_s))
			reply_len = -1;
	} else if (os_strncmp(buf, "GET_CAPABILITY ", 15) == 0) {
		reply_len = wpa_supplicant_ctrl_iface_get_capability(
			wpa_s, buf + 15, reply, reply_size);
	} else if (os_strncmp(buf, "AP_SCAN ", 8) == 0) {
		if (wpa_supplicant_ctrl_iface_ap_scan(wpa_s, buf + 8))
			reply_len = -1;
	} else if (os_strcmp(buf, "INTERFACES") == 0) {
		reply_len = wpa_supplicant_global_iface_interfaces(
			wpa_s->global, reply, reply_size);
    } else if (os_strncmp(buf, "DRIVER ", 7) == 0) {
        reply_len = wpa_supplicant_driver_cmd(wpa_s, buf + 7, reply, reply_size);
	} else {
		os_memcpy(reply, "UNKNOWN COMMAND\n", 16);
		reply_len = 16;
	}

	if (reply_len < 0) {
		os_memcpy(reply, "FAIL\n", 5);
		reply_len = 5;
	}

	if (ctrl_rsp)
		eapol_sm_notify_ctrl_response(wpa_s->eapol);

	*resp_len = reply_len;
	return reply;
}


static int wpa_supplicant_global_iface_add(struct wpa_global *global,
					   char *cmd)
{
	struct wpa_interface iface;
	char *pos;

	/*
	 * <ifname>TAB<confname>TAB<driver>TAB<ctrl_interface>TAB<driver_param>
	 * TAB<bridge_ifname>
	 */
	wpa_printf(MSG_DEBUG, "CTRL_IFACE GLOBAL INTERFACE_ADD '%s'", cmd);

	os_memset(&iface, 0, sizeof(iface));

	do {
		iface.ifname = pos = cmd;
		pos = os_strchr(pos, '\t');
		if (pos)
			*pos++ = '\0';
		if (iface.ifname[0] == '\0')
			return -1;
		if (pos == NULL)
			break;

		iface.confname = pos;
		pos = os_strchr(pos, '\t');
		if (pos)
			*pos++ = '\0';
		if (iface.confname[0] == '\0')
			iface.confname = NULL;
		if (pos == NULL)
			break;

		iface.driver = pos;
		pos = os_strchr(pos, '\t');
		if (pos)
			*pos++ = '\0';
		if (iface.driver[0] == '\0')
			iface.driver = NULL;
		if (pos == NULL)
			break;

		iface.ctrl_interface = pos;
		pos = os_strchr(pos, '\t');
		if (pos)
			*pos++ = '\0';
		if (iface.ctrl_interface[0] == '\0')
			iface.ctrl_interface = NULL;
		if (pos == NULL)
			break;

		iface.driver_param = pos;
		pos = os_strchr(pos, '\t');
		if (pos)
			*pos++ = '\0';
		if (iface.driver_param[0] == '\0')
			iface.driver_param = NULL;
		if (pos == NULL)
			break;

		iface.bridge_ifname = pos;
		pos = os_strchr(pos, '\t');
		if (pos)
			*pos++ = '\0';
		if (iface.bridge_ifname[0] == '\0')
			iface.bridge_ifname = NULL;
		if (pos == NULL)
			break;
	} while (0);

	if (wpa_supplicant_get_iface(global, iface.ifname))
		return -1;

	return wpa_supplicant_add_iface(global, &iface) ? 0 : -1;
}


static int wpa_supplicant_global_iface_remove(struct wpa_global *global,
					      char *cmd)
{
	struct wpa_supplicant *wpa_s;

	wpa_printf(MSG_DEBUG, "CTRL_IFACE GLOBAL INTERFACE_REMOVE '%s'", cmd);

	wpa_s = wpa_supplicant_get_iface(global, cmd);
	if (wpa_s == NULL)
		return -1;
	return wpa_supplicant_remove_iface(global, wpa_s);
}


static int wpa_supplicant_global_iface_interfaces(struct wpa_global *global,
						  char *buf, int len)
{
	int res;
	char *pos, *end;
	struct wpa_supplicant *wpa_s;

	wpa_s = global->ifaces;
	pos = buf;
	end = buf + len;

	while (wpa_s) {
		res = os_snprintf(pos, end - pos, "%s\n", wpa_s->ifname);
		if (res < 0 || res >= end - pos) {
			*pos = '\0';
			break;
		}
		pos += res;
		wpa_s = wpa_s->next;
	}
	return pos - buf;
}


char * wpa_supplicant_global_ctrl_iface_process(struct wpa_global *global,
						char *buf, size_t *resp_len)
{
	char *reply;
	const int reply_size = 4096;
	int reply_len;

    if (os_strcmp(buf, "PING") != 0)
        wpa_hexdump_ascii(MSG_DEBUG, "RX global ctrl_iface",
                          (const u8 *) buf, os_strlen(buf));

	reply = os_malloc(reply_size);
	if (reply == NULL) {
		*resp_len = 1;
		return NULL;
	}

	os_memcpy(reply, "OK\n", 3);
	reply_len = 3;

	if (os_strcmp(buf, "PING") == 0) {
		os_memcpy(reply, "PONG\n", 5);
		reply_len = 5;
	} else if (os_strncmp(buf, "INTERFACE_ADD ", 14) == 0) {
		if (wpa_supplicant_global_iface_add(global, buf + 14))
			reply_len = -1;
	} else if (os_strncmp(buf, "INTERFACE_REMOVE ", 17) == 0) {
		if (wpa_supplicant_global_iface_remove(global, buf + 17))
			reply_len = -1;
	} else if (os_strcmp(buf, "INTERFACES") == 0) {
		reply_len = wpa_supplicant_global_iface_interfaces(
			global, reply, reply_size);
	} else if (os_strcmp(buf, "TERMINATE") == 0) {
		eloop_terminate();
	} else {
		os_memcpy(reply, "UNKNOWN COMMAND\n", 16);
		reply_len = 16;
	}

	if (reply_len < 0) {
		os_memcpy(reply, "FAIL\n", 5);
		reply_len = 5;
	}

	*resp_len = reply_len;
	return reply;
}