1 files changed, 340 insertions, 0 deletions

diff --git a/src/pdu_decode.c b/src/pdu_decode.c
new file mode 100644
index 0000000..643fa15
--- /dev/null
+++ b/src/pdu_decode.c
@@ -0,0 +1,340 @@
+/*
+ * PDU Decode
+ *
+ * Copyright (C) 2010 by James Maki
+ *
+ * Author: James Maki <jmaki@multitech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include "config.h"
+#include "log.h"
+#include "utils.h"
+#include "pdu_decode.h"
+
+#define DECODE_FAIL(cond, name, ret) \
+do { \
+	if (cond) { \
+		log_error("decode failed at %s", name); \
+		return ret; \
+	} \
+} while (0)
+
+int pdu_decode_timestamp(const char *pdu_str, struct tm *tm)
+{
+	char buf[PDU_TIMESTAMP_SIZE + 3];
+	char *cp;
+	int off_upper;
+	int off_lower;
+	int off;
+
+	STRLEN_CHECK(pdu_str, PDU_TIMESTAMP_LEN, -1);
+
+	memset(tm, 0, sizeof(*tm));
+	memset(buf, 0, sizeof(buf));
+
+	strncpy(buf, pdu_str, PDU_TIMESTAMP_LEN);
+	nibble_swap(buf, PDU_TIMESTAMP_LEN);
+	strunpad(buf, 'F');
+
+	off_upper = hex_nibble_scan(buf + GMT_OFFSET_IDX, 1);
+	off_lower = hex_nibble_scan(buf + GMT_OFFSET_IDX + 1, 1);
+
+	if (off_upper & BIT(3)) {
+		off_upper &= ~BIT(3);
+		buf[GMT_OFFSET_IDX] = '-';
+	} else {
+		buf[GMT_OFFSET_IDX] = '+';
+	}
+
+	off = (off_upper * 10 + off_lower) * 15;
+
+	snprintf(buf + GMT_OFFSET_IDX + 1, 5, "%02d%02d", off / 60, off % 60);
+
+	cp = (char *) strptime(buf, "%y%m%d%H%M%S%z", tm);
+	if (!cp || *cp) {
+		log_error("timestamp could not be converted to tm");
+		return -1;
+	}
+
+	return PDU_TIMESTAMP_LEN;
+}
+
+int pdu_decode_addr(const char *pdu_str, struct pdu_addr *addr, int smsc)
+{
+	const char *begin = pdu_str;
+	int addr_len;
+	int tmp;
+
+	memset(addr, 0, sizeof(*addr));
+
+	STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+	tmp = hex_byte_decode(pdu_str);
+	DECODE_FAIL(tmp < 0, "addr-len", -1);
+	pdu_str += HEX_BYTE_LEN;
+	addr->len = tmp;
+
+	addr_len = addr->len;
+	if (smsc) {
+		if (!addr_len) {
+			goto done;
+		}
+		addr_len = addr_len * HEX_BYTE_LEN - HEX_BYTE_LEN;
+	} else {
+		if (addr_len & 1) {
+			addr_len++;
+		}
+	}
+
+	STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+	tmp = hex_byte_decode(pdu_str);
+	DECODE_FAIL(tmp < 0, "addr-type", -1);
+	pdu_str += HEX_BYTE_LEN;
+	addr->type = tmp;
+
+	if (addr_len < 0 || addr_len >= sizeof(addr->addr)) {
+		log_error("invalid length: 0x%02X", addr_len);
+		return -1;
+	}
+
+	log_debug("addr-len [transformed]: 0x%02X", addr_len);
+	log_debug("addr-type: 0x%02X", addr->type);
+
+	STRLEN_CHECK(pdu_str, addr_len, -1);
+
+	strncpy(addr->addr, pdu_str, addr_len);
+
+	nibble_swap(addr->addr, addr_len);
+	strunpad(addr->addr, 'F');
+	pdu_str += addr_len;
+
+done:
+
+	log_debug("addr: %s", addr->addr);
+	log_debug("addr-len: 0x%02X", addr->len);
+
+	return pdu_str - begin;
+}
+
+#define octet_idx(n)		octet_align(n)
+
+#define decode_septet(buf, n) \
+shiftl(bit_maskr(cycledown(n, 8)) & buf[octet_idx(n)], cycleup(n, 8)) | \
+shiftr(bit_maskl(cycleup(n, 8), 8) & buf[octet_idx(n - 1)], cycledown(n - 1, 8))
+
+int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu)
+{
+	const char *begin = pdu_str;
+	int tmp;
+	uint8_t octets[PDU_OCTETS_MAX + 1];
+	int nr_octets;
+	int i;
+
+	STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+	tmp = hex_byte_decode(pdu_str);
+	DECODE_FAIL(tmp < 0, "user-data-len", -1);
+	pdu_str += HEX_BYTE_LEN;
+	pdu->user_data_len = tmp;
+
+	if (pdu->data_coding.general.unused) {
+		log_error("data coding group 0x%02X not implemented",
+				pdu->data_coding.data_coding & 0xF0);
+		return -1;
+	}
+
+	if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) {
+		log_debug("data coding alphabet is default");
+
+		if (pdu->user_data_len > PDU_UD_7BIT_MAX) {
+			log_warning("pdu contains invalid user-data-len: 0x%02X",
+					pdu->user_data_len);
+			pdu->user_data_len = PDU_UD_7BIT_MAX;
+		}
+
+		nr_octets = octet_align(pdu->user_data_len);
+	} else if (pdu->data_coding.general.alphabet == PDU_ALPHABET_EIGHT) {
+		log_debug("data coding alphabet is eight");
+
+		if (pdu->user_data_len > PDU_UD_8BIT_MAX) {
+			log_warning("pdu contains invalid user-data-len: 0x%02X",
+					pdu->user_data_len);
+			pdu->user_data_len = PDU_UD_8BIT_MAX;
+		}
+
+		nr_octets = pdu->user_data_len;
+	} else {
+		log_debug("data coding alphabet 0x%02X not implemented",
+				pdu->data_coding.general.alphabet);
+		return -1;
+	}
+
+	STRLEN_CHECK(pdu_str, nr_octets * 2, -1);
+
+	log_debug("user-data-len: 0x%02X", pdu->user_data_len);
+	log_debug("nr_octets: 0x%02X", nr_octets);
+
+	for (i = 0; i < nr_octets; i++) {
+		octets[i] = hex_byte_decode(pdu_str);
+		pdu_str += HEX_BYTE_LEN;
+	}
+
+	if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) {
+		for (i = 0; i < pdu->user_data_len; i++) {
+			pdu->user_data[i] = decode_septet(octets, i);
+		}
+		pdu->user_data[i] = '\0';
+	} else {
+		for (i = 0; i < pdu->user_data_len; i++) {
+			pdu->user_data[i] = octets[i];
+		}
+		pdu->user_data[i] = '\0';
+	}
+
+	return pdu_str - begin;
+}
+
+int pdu_decode(const char *pdu_str, struct pdu_info *pdu)
+{
+	const char *begin = pdu_str;
+	const char *msg_begin;
+	int tmp;
+
+	memset(pdu, 0, sizeof(*pdu));
+
+	tmp = pdu_decode_addr(pdu_str, &pdu->smsc_addr, 1);
+	DECODE_FAIL(tmp < 0, "smsc-addr", -1);
+	pdu_str += tmp;
+
+	msg_begin = pdu_str;
+
+	log_debug("smsc-addr: %s", pdu->smsc_addr.addr);
+	log_debug("smsc-addr-type: 0x%02X", pdu->smsc_addr.type);
+	log_debug("smsc-addr-len: 0x%02X", pdu->smsc_addr.len);
+
+	STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+	tmp = hex_byte_decode(pdu_str);
+	DECODE_FAIL(tmp < 0, "type", -1);
+	pdu_str += HEX_BYTE_LEN;
+	pdu->type.type = tmp;
+
+	log_debug("type: 0x%02X", pdu->type.type);
+
+	if (pdu->type.msg_type == PDU_MTI_SUBMIT ||
+	    pdu->type.msg_type == PDU_MTI_REPORT) {
+		STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+		tmp = hex_byte_decode(pdu_str);
+		DECODE_FAIL(tmp < 0, "msg-reference", -1);
+		pdu_str += HEX_BYTE_LEN;
+		pdu->msg_reference = tmp;
+
+		log_debug("msg-reference: 0x%02X", pdu->msg_reference);
+	}
+
+	tmp = pdu_decode_addr(pdu_str, &pdu->addr, 0);
+	DECODE_FAIL(tmp < 0, "addr", -1);
+	pdu_str += tmp;
+
+	log_debug("addr: %s", pdu->addr.addr);
+	log_debug("addr-type: 0x%02X", pdu->addr.type);
+	log_debug("addr-len: 0x%02X", pdu->addr.len);
+
+	switch (pdu->type.msg_type) {
+	case PDU_MTI_REPORT:
+		tmp = pdu_decode_timestamp(pdu_str, &pdu->timestamp);
+		DECODE_FAIL(tmp < 0, "report-timestamp", -1);
+		pdu_str += tmp;
+
+		break;
+	case PDU_MTI_DELIVER:
+	case PDU_MTI_SUBMIT:
+		STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+		tmp = hex_byte_decode(pdu_str);
+		DECODE_FAIL(tmp < 0, "protocol-id", -1);
+		pdu_str += HEX_BYTE_LEN;
+		pdu->protocol_id = tmp;
+
+		log_debug("protocol-id: 0x%02X", pdu->protocol_id);
+
+		STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+		tmp = hex_byte_decode(pdu_str);
+		DECODE_FAIL(tmp < 0, "data-coding-scheme", -1);
+		pdu_str += HEX_BYTE_LEN;
+		pdu->data_coding.data_coding = tmp;
+
+		log_debug("data-coding-scheme: 0x%02X", pdu->data_coding.data_coding);
+
+		if (pdu->type.msg_type == PDU_MTI_SUBMIT) {
+			log_debug("validity-period-format: 0x%02X",
+					pdu->type.validity_period_format);
+			switch (pdu->type.validity_period_format) {
+			case PDU_VPF_RELATIVE:
+				STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
+
+				tmp = hex_byte_decode(pdu_str);
+				DECODE_FAIL(tmp < 0, "validity-period", -1);
+				pdu_str += HEX_BYTE_LEN;
+				pdu->validity_period = tmp;
+
+				log_debug("validity-period: 0x%02X", pdu->validity_period);
+
+				break;
+
+			case PDU_VPF_ENHANCED:
+				log_warning("PDU_VPF_ENHANCED? Falling through to absolute");
+			case PDU_VPF_ABSOUTE:
+				tmp = pdu_decode_timestamp(pdu_str, &pdu->timestamp);
+				DECODE_FAIL(tmp < 0, "validity-period-timestamp", -1);
+				pdu_str += tmp;
+
+				return -1;
+
+			case PDU_VPF_NOT_PRESENT:
+			default:
+				break;
+			}
+		} else if (pdu->type.msg_type == PDU_MTI_DELIVER) {
+			tmp = pdu_decode_timestamp(pdu_str, &pdu->timestamp);
+			DECODE_FAIL(tmp < 0, "delivery-timestamp", -1);
+			pdu_str += tmp;
+		}
+
+		tmp = pdu_decode_user_data(pdu_str, pdu);
+		DECODE_FAIL(tmp < 0, "user-data", -1);
+		pdu_str += tmp;
+	}
+
+	pdu->msg_len = (pdu_str - msg_begin) / 2;
+
+	log_debug("msg_len: %d", pdu->msg_len);
+
+	return pdu_str - begin;
+}