print-ppp.c

Windump3.6.2源代码

		break;

	case CPCODES_TERM_REQ:
	case CPCODES_TERM_ACK:
		/* XXX: need to decode Data? */
		break;
	case CPCODES_CODE_REJ:
		/* XXX: need to decode Rejected-Packet? */
		break;
	case CPCODES_PROT_REJ:
		if (length < 6)
			break;
		printf(", Rejected-Protocol=%04x", EXTRACT_16BITS(p));
		/* XXX: need to decode Rejected-Information? */
		break;
	case CPCODES_ECHO_REQ:
	case CPCODES_ECHO_RPL:
	case CPCODES_DISC_REQ:
	case CPCODES_ID:
		if (length < 8)
			break;
		printf(", Magic-Num=%08x", EXTRACT_32BITS(p));
		/* XXX: need to decode Data? */
		break;
	case CPCODES_TIME_REM:
		if (length < 12)
			break;
		printf(", Magic-Num=%08x", EXTRACT_32BITS(p));
		printf(" Seconds-Remaining=%u", EXTRACT_32BITS(p + 4));
		/* XXX: need to decode Message? */
		break;
	default:
		printf(", unknown-Codes-0x%02x", code);
		break;
	}
}

/* LCP config options */
static int
print_lcp_config_options(const u_char *p, int length)
{
	int len, opt;

	if (length < 2)
		return 0;
	len = p[1];
	opt = p[0];
	if (length < len)
		return 0;
	if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
		printf(", %s", lcpconfopts[opt]);
	else {
		printf(", unknwhown-%d", opt);
		return len;
	}

	switch (opt) {
	case LCPOPT_VEXT:
		if (len >= 6) {
			printf(" OUI=%02x%02x%02x", p[2], p[3], p[4]);
#if 0
			printf(" kind=%02x", p[5]);
			printf(" val=")
			for (i = 0; i < len - 6; i++) {
				printf("%02x", p[6 + i]);
			}
#endif
		}
		break;
	case LCPOPT_MRU:
		if (len == 4)
			printf("=%u", EXTRACT_16BITS(p + 2));
		break;
	case LCPOPT_ACCM:
		if (len == 6)
			printf("=%08x", EXTRACT_32BITS(p + 2));
		break;
	case LCPOPT_AP:
		if (len >= 4) {
			if (p[2] == 0xc0 && p[3] == 0x23)
				printf(" PAP");
			else if (p[2] == 0xc2 && p[3] == 0x23) {
				printf(" CHAP/");
				switch (p[4]) {
				default:
					printf("unknown-algorithm-%u", p[4]);
					break;
				case AUTHALG_CHAPMD5:
					printf("MD5");
					break;
				case AUTHALG_MSCHAP1:
					printf("MSCHAPv1");
					break;
				case AUTHALG_MSCHAP2:
					printf("MSCHAPv2");
					break;
				}
			}
			else if (p[2] == 0xc2 && p[3] == 0x27)
				printf(" EAP");
			else if (p[2] == 0xc0 && p[3] == 0x27)
				printf(" SPAP");
			else if (p[2] == 0xc1 && p[3] == 0x23)
				printf(" Old-SPAP");
			else
				printf("unknown");
		}
		break;
	case LCPOPT_QP:
		if (len >= 4) {
			if (p[2] == 0xc0 && p[3] == 0x25)
				printf(" LQR");
			else
				printf(" unknown");
		}
		break;
	case LCPOPT_MN:
		if (len == 6)
			printf("=%08x", EXTRACT_32BITS(p + 2));
		break;
	case LCPOPT_PFC:
		break;
	case LCPOPT_ACFC:
		break;
	case LCPOPT_LD:
		if (len == 4)
			printf("=%04x", EXTRACT_16BITS(p + 2));
		break;
	case LCPOPT_CBACK:
		if (len < 3)
			break;
		switch (p[2]) {		/* Operation */
		case CALLBACK_AUTH:
			printf(" UserAuth");
			break;
		case CALLBACK_DSTR:
			printf(" DialString");
			break;
		case CALLBACK_LID:
			printf(" LocalID");
			break;
		case CALLBACK_E164:
			printf(" E.164");
			break;
		case CALLBACK_X500:
			printf(" X.500");
			break;
		case CALLBACK_CBCP:
			printf(" CBCP");
			break;
		default:
			printf(" unknown-operation=%u", p[2]);
			break;
		}
		break;
	case LCPOPT_MLMRRU:
		if (len == 4)
			printf("=%u", EXTRACT_16BITS(p + 2));
		break;
	case LCPOPT_MLED:
		if (len < 3)
			break;
		switch (p[2]) {		/* class */
		case MEDCLASS_NULL:
			printf(" Null");
			break;
		case MEDCLASS_LOCAL:
			printf(" Local"); /* XXX */
			break;
		case MEDCLASS_IPV4:
			if (len != 7)
				break;
			printf(" IPv4=%s", ipaddr_string(p + 3));
			break;
		case MEDCLASS_MAC:
			if (len != 9)
				break;
			printf(" MAC=%02x:%02x:%02x:%02x:%02x:%02x",
			       p[3], p[4], p[5], p[6], p[7], p[8]);
			break;
		case MEDCLASS_MNB:
			printf(" Magic-Num-Block"); /* XXX */
			break;
		case MEDCLASS_PSNDN:
			printf(" PSNDN"); /* XXX */
			break;
		}
		break;

/* XXX: to be supported */
#if 0
	case LCPOPT_DEP6:
	case LCPOPT_FCSALT:
	case LCPOPT_SDP:
	case LCPOPT_NUMMODE:
	case LCPOPT_DEP12:
	case LCPOPT_DEP14:
	case LCPOPT_DEP15:
	case LCPOPT_DEP16:
	case LCPOPT_MLSSNHF:
	case LCPOPT_PROP:
	case LCPOPT_DCEID:
	case LCPOPT_MPP:
	case LCPOPT_LCPAOPT:
	case LCPOPT_COBS:
	case LCPOPT_PE:
	case LCPOPT_MLHF:
	case LCPOPT_I18N:
	case LCPOPT_SDLOS:
	case LCPOPT_PPPMUX:
		break;
#endif
	}
	return len;
}

/* CHAP */
static void
handle_chap(const u_char *p, int length)
{
	u_int code, len;
	int val_size, name_size, msg_size;
	const u_char *p0;
	int i;

	p0 = p;
	if (length < 1) {
		printf("[|chap]");
		return;
	} else if (length < 4) {
		printf("[|chap 0x%02x]", *p);
		return;
	}

	code = *p;
	if ((code >= CHAP_CODEMIN) && (code <= CHAP_CODEMAX))
		printf("%s", chapcode[code - 1]);
	else {
		printf("0x%02x", code);
		return;
	}
	p++;

	printf("(%u)", *p);		/* ID */
	p++;

	len = EXTRACT_16BITS(p);
	p += 2;

	/*
	 * Note that this is a generic CHAP decoding routine. Since we
	 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
	 * MS-CHAPv2) is used at this point, we can't decode packet
	 * specifically to each algorithms. Instead, we simply decode
	 * the GCD (Gratest Common Denominator) for all algorithms.
	 */
	switch (code) {
	case CHAP_CHAL:
	case CHAP_RESP:
		if (length - (p - p0) < 1)
			return;
		val_size = *p;		/* value size */
		p++;
		if (length - (p - p0) < val_size)
			return;
		printf(", Value=");
		for (i = 0; i < val_size; i++)
			printf("%02x", *p++);
		name_size = len - (p - p0);
		printf(", Name=");
		for (i = 0; i < name_size; i++)
			safeputchar(*p++);
		break;
	case CHAP_SUCC:
	case CHAP_FAIL:
		msg_size = len - (p - p0);
		printf(", Msg=");
		for (i = 0; i< msg_size; i++)
			safeputchar(*p++);
		break;
	}
}

/* PAP (see RFC 1334) */
static void
handle_pap(const u_char *p, int length)
{
	u_int code, len;
	int peerid_len, passwd_len, msg_len;
	const u_char *p0;
	int i;

	p0 = p;
	if (length < 1) {
		printf("[|pap]");
		return;
	} else if (length < 4) {
		printf("[|pap 0x%02x]", *p);
		return;
	}

	code = *p;
	if ((code >= PAP_CODEMIN) && (code <= PAP_CODEMAX))
		printf("%s", papcode[code - 1]);
	else {
		printf("0x%02x", code);
		return;
	}
	p++;

	printf("(%u)", *p);		/* ID */
	p++;

	len = EXTRACT_16BITS(p);
	p += 2;

	switch (code) {
	case PAP_AREQ:
		if (length - (p - p0) < 1)
			return;
		peerid_len = *p;	/* Peer-ID Length */
		p++;
		if (length - (p - p0) < peerid_len)
			return;
		printf(", Peer=");
		for (i = 0; i < peerid_len; i++)
			safeputchar(*p++);

		if (length - (p - p0) < 1)
			return;
		passwd_len = *p;	/* Password Length */
		p++;
		if (length - (p - p0) < passwd_len)
			return;
		printf(", Name=");
		for (i = 0; i < passwd_len; i++)
			safeputchar(*p++);
		break;
	case PAP_AACK:
	case PAP_ANAK:
		if (length - (p - p0) < 1)
			return;
		msg_len = *p;		/* Msg-Length */
		p++;
		if (length - (p - p0) < msg_len)
			return;
		printf(", Msg=");
		for (i = 0; i< msg_len; i++)
			safeputchar(*p++);
		break;
	}
	return;
}

/* BAP */
static void
handle_bap(const u_char *p, int length)
{
	/* XXX: to be supported!! */
}


/* IPCP config options */
static int
print_ipcp_config_options(const u_char *p, int length)
{
	int len, opt;

	if (length < 2)
		return 0;
	len = p[1];
	opt = p[0];
	if (length < len)
		return 0;
	switch (opt) {
	case IPCPOPT_2ADDR:		/* deprecated */
		if (len != 10)
			goto invlen;
		printf(", IP-Addrs src=%s dst=%s",
		       ipaddr_string(p + 2),
		       ipaddr_string(p + 6));
		break;
	case IPCPOPT_IPCOMP:
		if (len < 4)
			goto invlen;
		printf(", IP-Comp");
		if (EXTRACT_16BITS(p + 2) == PPP_VJC) {
			printf(" VJ-Comp");
			/* XXX: VJ-Comp parameters should be decoded */
		} else
			printf(" unknown-comp-proto=%04x", EXTRACT_16BITS(p + 2));
		break;
	case IPCPOPT_ADDR:
		if (len != 6)
			goto invlen;
		printf(", IP-Addr=%s", ipaddr_string(p + 2));
		break;
	case IPCPOPT_MOBILE4:
		if (len != 6)
			goto invlen;
		printf(", Home-Addr=%s", ipaddr_string(p + 2));
		break;
	case IPCPOPT_PRIDNS:
		if (len != 6)
			goto invlen;
		printf(", Pri-DNS=%s", ipaddr_string(p + 2));
		break;
	case IPCPOPT_PRINBNS:
		if (len != 6)
			goto invlen;
		printf(", Pri-NBNS=%s", ipaddr_string(p + 2));
		break;
	case IPCPOPT_SECDNS:
		if (len != 6)
			goto invlen;
		printf(", Sec-DNS=%s", ipaddr_string(p + 2));
		break;
	case IPCPOPT_SECNBNS:
		if (len != 6)
			goto invlen;
		printf(", Sec-NBNS=%s", ipaddr_string(p + 2));
		break;
	default:
		printf(", unknown-%d", opt);
		break;
	}
	return len;

invlen:
	printf(", invalid-length-%d", opt);
	return 0;
}

/* CCP config options */
static int
print_ccp_config_options(const u_char *p, int length)
{
	int len, opt;

	if (length < 2)
		return 0;
	len = p[1];
	opt = p[0];
	if (length < len)
		return 0;
	if ((opt >= CCPOPT_MIN) && (opt <= CCPOPT_MAX))
		printf(", %s", ccpconfopts[opt]);
#if 0	/* XXX */
	switch (opt) {
	case CCPOPT_OUI:
	case CCPOPT_PRED1:
	case CCPOPT_PRED2:
	case CCPOPT_PJUMP:
	case CCPOPT_HPPPC:
	case CCPOPT_STACLZS:
	case CCPOPT_MPPC:
	case CCPOPT_GFZA:
	case CCPOPT_V42BIS:
	case CCPOPT_BSDCOMP:
	case CCPOPT_LZSDCP:
	case CCPOPT_MVRCA:
	case CCPOPT_DEC: