File	Doc	Category	Size	Date	Package
WifiParser.java	API Doc	Android 5.1 API	10059	Thu Mar 12 22:22:52 GMT 2015	com.android.server.wifi

WifiParser

• java.lang.Object

Fields Summary
private static final int	VENDOR_SPECIFIC_IE
private static final int	IEEE_RSN_IE
private static final int	WPA_IE_VENDOR_TYPE

Constructors Summary
public WifiParser()

Methods Summary

public static java.lang.String

parse_akm(com.android.server.wifi.WifiParser$IE[] full_IE, java.util.BitSet ieee_cap) //WFA WPA vendor IE OUI/type /* * parse beacon or probe response frame and build the capabilities * {@hide} * * This function is called so as to build the capabilities string of the scan result, hence it is called * by AutoJoin controller when handling scan results that are coming from WifiScanner. * * It parses the ieee beacon's capability field, WPA and RSNE IE as per spec, but build the * ScanResult.capabilities String in a way that mirror the values returned by wpa_supplicant. * * Once the capabilities string is build, the ScanResult can be used be the system as if it was coming from supplicant. */ /* @hide * */ boolean privacy = false; boolean error = false; if (ieee_cap == null) return null; if (full_IE == null) return null; privacy = ieee_cap.get(4); String capabilities = ""; boolean rsne_found = false; boolean wpa_found = false; for (IE ie : full_IE) { String security = ""; if (ie.id == IEEE_RSN_IE) { rsne_found = true; //parsing WPA2 capabilities ByteBuffer buf = ByteBuffer.wrap(ie.data); int total_len = ie.data.length; int offset = 2; //version if ((total_len - offset) < 2) { //not enough space for version field security = ""; error = true; break; } int val = 0; if (0x0100 != buf.getShort(offset)) { //incorrect version security = ""; error = true; break; } offset += 2; //group cipher if ((total_len - offset) < 4) { security = ""; //parse error on group cipher suite error = true; break; } offset += 4; //skip the group cipher security = "[WPA2"; //found the RSNE IE, hence start building the capability string //pairwise cipher if ((total_len - offset) < 2) { security = ""; //parse error no pairwise cipher error = true; break; } val = buf.getShort(offset); if ((total_len - offset) < (2 + val * 4)) { security = ""; //parse error no pairwise cipher error = true; break; } offset += 2 + val * 4; //skip the pairwise ciphers //AKM if ((total_len - offset) < 2) { security = ""; //parse error no AKM error = true; break; } val = buf.getShort(offset); if ((total_len - offset) < (2 + val * 4)) { security = ""; //parse error no pairwise cipher error = true; break; } offset += 2; if (val == 0) { security += "-EAP"; //default AKM } for (int i = 0; i < val; i++) { int akm = buf.getInt(offset); boolean found = false; switch (akm) { case 0x01ac0f00: security += found ? "+" : "-" + "EAP"; found = true; break; case 0x02ac0f00: security += found ? "+" : "-" + "PSK"; //PSK as 802.11-2012 11.6.1.2 found = true; break; case 0x03ac0f00: security += found ? "+" : "-" + "FT/EAP"; found = true; break; case 0x04ac0f00: security += found ? "+" : "-" + "FT/PSK"; found = true; break; case 0x06ac0f00: security += found ? "+" : "-" + "PSK-SHA256"; found = true; break; case 0x05ac0f00: security += found ? "+" : "-" + "EAP-SHA256"; found = true; break; } offset += 4; } //we parsed what we want at this point security += "]"; capabilities += security; } if (ie.id == VENDOR_SPECIFIC_IE) { int total_len = ie.data.length; int offset = 2; //version if ((total_len - offset) < 4) { //not enough space for OUI and type field security = ""; error = true; break; } ByteBuffer buf = ByteBuffer.wrap(ie.data); if (buf.getInt(offset) != 0x01F25000) { //look for HS2.0 and WPA IE security = ""; continue; } security = "[WPA"; //prep the string for WPA //version if ((total_len - offset) < 2) { //not enough space for version field security = ""; error = true; break; } int val = 0; if (0x0100 != buf.getShort(offset)) { //incorrect version security = ""; error = true; break; } offset += 2; //group cipher if ((total_len - offset) < 4) { security = ""; //parse error on group cipher suite error = true; break; } offset += 4; //skip the group cipher //pairwise cipher if ((total_len - offset) < 2) { security = ""; //parse error no pairwise cipher error = true; break; } val = buf.getShort(offset); if ((total_len - offset) < (2 + val * 4)) { security = ""; //parse error no pairwise cipher error = true; break; } offset += 2 + val * 4; //skip the pairwise ciphers //AKM if ((total_len - offset) < 2) { security = ""; //parse error no AKM error = true; break; } val = buf.getShort(offset); if ((total_len - offset) < (2 + val * 4)) { security = ""; //parse error no pairwise cipher error = true; break; } offset += 2; if (val == 0) { security += "-EAP"; //default AKM } for (int i = 0; i < val; i++) { int akm = buf.getInt(offset); boolean found = false; switch (akm) { case 0x01f25000: security += found ? "+" : "-" + "EAP"; found = true; break; case 0x02f25000: security += found ? "+" : "-" + "PSK"; //PSK as 802.11-2012 11.6.1.2 found = true; break; } offset += 4; } //we parsed what we want at this point security += "]"; } } if (rsne_found == false && wpa_found == false && privacy) { //private Beacon without an RSNE or WPA IE, hence WEP0 capabilities += "[WEP]"; } if (error) return null; else return capabilities;