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/*
* 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 "global.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_cdma_timestamp(const char *pdu_str, struct tm *tm)
{
char buf[PDU_CDMA_TIMESTAMP_LEN + 1];
char *cp;
int off_upper;
int off_lower;
int off;
STRLEN_CHECK(pdu_str, PDU_CDMA_TIMESTAMP_LEN, -1);
memset(tm, 0, sizeof(*tm));
memset(buf, 0, sizeof(buf));
strncpy(buf, pdu_str, PDU_CDMA_TIMESTAMP_LEN);
cp = (char *) strptime(buf, "%y%m%d%H%M%S", tm);
if (!cp || *cp) {
log_error("timestamp could not be converted to tm");
return -1;
}
return PDU_CDMA_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 octet_cdma_idx(n) ((n+1) * 7 / 8)
#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))
#define decode_septet_cdma(buf, n) \
shiftr(buf[octet_cdma_idx(n)], cycleup(n, 8) + 1) | \
shiftl(buf[octet_cdma_idx(n) - 1], cycledown(n, 8)) & 0x7F
int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu, int *nr_octets)
{
const char *begin = pdu_str;
int tmp;
uint8_t octets[PDU_OCTETS_MAX + 1];
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_CDMA_DEFAULT) {
log_debug("data coding alphabet is cdma default");
if (!strcmp(Global.core.model, "LE910-SVG")) {
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;
}
}
else {
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;
}
}
if (!strcmp(Global.core.model, "LE910-SVG")) {
*nr_octets = octet_align(pdu->user_data_len);
}
else {
*nr_octets = pdu->user_data_len;
pdu->user_data_len = octet_align_cdma(pdu->user_data_len);
}
} else if ((pdu->data_coding.general.alphabet == PDU_ALPHABET_EIGHT) ||
(pdu->data_coding.general.alphabet == PDU_ALPHABET_CDMA_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) {
// Keep UDH for concatenated SMS.
// Otherwise it is impossible to process correctly concatenated SMS.
i = 0;
if (pdu->type.user_data_header) {
for (i = 0; i <= octets[0]; ++i) {
pdu->user_data[i] = octets[i];
}
i = octets[0] + 1; // Set message text start after UDH.
// Process octets padding for 7-bit encoding.
if (0 != (i * 8) % 7) {
pdu->user_data[i] = 0; // set padding data to 0;
i++;
}
}
for (; i < pdu->user_data_len; i++) {
pdu->user_data[i] = decode_septet(octets, i);
}
pdu->user_data[i] = '\0';
} else if (pdu->data_coding.general.alphabet == PDU_ALPHABET_CDMA_DEFAULT) {
// Keep UDH for concatenated SMS.
// Otherwise it is impossible to process correctly concatenated SMS.
i = 0;
if (pdu->type.user_data_header) {
for (i = 0; i <= octets[0]; ++i) {
pdu->user_data[i] = octets[i];
}
i = octets[0] + 1; // Set message text start after UDH.
// Process octets padding for 7-bit encoding.
if (0 != (i * 8) % 7) {
pdu->user_data[i] = 0; // set padding data to 0;
i++;
}
}
for (; i < pdu->user_data_len; i++) {
pdu->user_data[i] = decode_septet_cdma(octets, i);
log_debug("DECODE: i: %d octet: 0x%02X --> data: 0x%02X", i, octets[i], pdu->user_data[i]);
}
//Remove padded byte for data length of 7 characters if not LE910-SVG
if (strcmp(Global.core.model, "LE910-SVG") && pdu->user_data[i-1] == 0) {
log_debug("Removing padded char");
i--;
pdu->user_data_len--;
}
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;
int nr_octets;
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, &nr_octets);
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;
}
int pdu_decode_cdma(const char *pdu_str, struct pdu_info *pdu)
{
const char *begin = pdu_str;
const char *msg_begin;
int tmp;
int nr_octets;
memset(pdu, 0, sizeof(*pdu));
//Destination address
tmp = pdu_decode_addr(pdu_str, &pdu->addr, 1);
DECODE_FAIL(tmp < 0, "addr", -1);
pdu_str += tmp;
msg_begin = pdu_str;
STRLEN_CHECK(pdu_str, HEX_BYTE_LEN, -1);
//Timestamp
tmp = pdu_decode_cdma_timestamp(pdu_str, &pdu->timestamp);
DECODE_FAIL(tmp < 0, "timestamp", -1);
pdu_str += tmp;
//Teleservice ID
tmp = hex_byte_decode(pdu_str);
DECODE_FAIL(tmp < 0, "tele-id-1", -1);
pdu_str += HEX_BYTE_LEN;
log_debug("tele-id-1: 0x%02X", tmp);
tmp = hex_byte_decode(pdu_str);
DECODE_FAIL(tmp < 0, "tele-id-2", -1);
pdu_str += HEX_BYTE_LEN;
log_debug("tele-id-2: 0x%02X", tmp);
//Priority
tmp = hex_byte_decode(pdu_str);
DECODE_FAIL(tmp < 0, "priority", -1);
pdu_str += HEX_BYTE_LEN;
log_debug("priority: 0x%02X", tmp);
//Data coding scheme
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);
//User Data
tmp = pdu_decode_user_data(pdu_str, pdu, &nr_octets);
DECODE_FAIL(tmp < 0, "user-data", -1);
pdu_str += tmp;
pdu->msg_len = 6 + nr_octets;
log_debug("msg_len: %d", pdu->msg_len);
return pdu_str - begin;
}
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