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/*
* PDU Encode
*
* 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
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <ctype.h>
#include "global.h"
#include "utils.h"
#include "pdu_encode.h"
#define ENCODE_FAIL(cond, name, ret) \
do { \
if (cond) { \
log_error("encode failed at %s", name); \
return ret; \
} \
} while (0)
int pdu_encode_timestamp(char *pdu_str, size_t len, struct tm *tm)
{
int tmp;
int off_upper;
int off_lower;
int off;
int negative;
if (len < PDU_TIMESTAMP_SIZE) {
log_error("buffer is not large enough to hold a timestamp");
return -1;
}
tmp = strftime(pdu_str, PDU_TIMESTAMP_SIZE, "%y%m%d%H%M%S", tm);
ENCODE_FAIL(tmp != GMT_OFFSET_IDX, "timestamp", -1);
off = tm->tm_gmtoff;
if (off < 0) {
off = -off;
negative = 1;
}
off = off / 60 / 15;
off_upper = off / 10;
off_lower = off % 10;
if (negative) {
off_upper |= BIT(3);
}
snprintf(pdu_str + GMT_OFFSET_IDX, 2, "%X", off_upper & 0xF);
snprintf(pdu_str + GMT_OFFSET_IDX + 1, 2, "%X", off_lower & 0xF);
strpad(pdu_str, PDU_TIMESTAMP_LEN, 'F');
nibble_swap(pdu_str, PDU_TIMESTAMP_LEN);
log_debug("%s", pdu_str);
return PDU_TIMESTAMP_LEN;
}
int pdu_encode_addr(char *pdu_str, size_t len, struct pdu_addr *addr, int smsc)
{
char *begin = pdu_str;
int addr_len;
int tmp;
addr_len = strlen(addr->addr);
if (smsc) {
if (addr_len) {
if (addr_len & 1) {
addr_len++;
}
addr_len = addr_len / HEX_BYTE_LEN + 1;
}
}
log_debug("addr-len [transformed]: 0x%02X", addr_len);
addr->len = addr_len;
tmp = hex_byte_encode(pdu_str, len, addr_len);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "addr-len", -1);
pdu_str += tmp;
len -= tmp;
if (smsc && !addr_len) {
log_debug("smsc addr is empty");
goto done;
}
tmp = hex_byte_encode(pdu_str, len, addr->type);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "addr-type", -1);
pdu_str += tmp;
len -= tmp;
addr_len = strlen(addr->addr);
if (addr_len & 1) {
addr_len++;
}
if (len < addr_len + 1) {
log_error("buffer is not large enough to hold the addr");
return -1;
}
strcpy(pdu_str, addr->addr);
strpad(pdu_str, addr_len, 'F');
nibble_swap(pdu_str, addr_len);
len -= addr_len;
pdu_str += addr_len;
done:
return pdu_str - begin;
}
#define septet_idx(n) ((n) * 8 / 7)
#define encode_octet(buf, n) \
shiftr(bit_maskl(cycledown(n, 7) + 1, 7) & buf[septet_idx(n)], cycleup(n, 7)) | \
shiftl(bit_maskr(cycleup(n, 7) + 1) & buf[septet_idx(n) + 1], cycledown(n, 7) + 1)
int pdu_encode_user_data(char *pdu_str, size_t len, struct pdu_info *pdu)
{
char *begin = pdu_str;
int tmp;
uint8_t octets[PDU_OCTETS_MAX];
int nr_octets;
int i;
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");
} else if (pdu->data_coding.general.alphabet == PDU_ALPHABET_EIGHT) {
log_debug("data coding alphabet is eight");
} else {
log_debug("data coding alphabet 0x%02X not implemented",
pdu->data_coding.general.alphabet);
return -1;
}
if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) {
if (pdu->user_data_len > PDU_UD_7BIT_MAX) {
log_error("string exceeds 7-bit data max length");
return -1;
}
nr_octets = octet_align(pdu->user_data_len);
for (i = 0; i < nr_octets; i++) {
octets[i] = encode_octet(pdu->user_data, i);
}
} else {
if (pdu->user_data_len > PDU_UD_8BIT_MAX) {
log_error("string exceeds 8-bit data max length");
return -1;
}
nr_octets = pdu->user_data_len;
for (i = 0; i < pdu->user_data_len; i++) {
octets[i] = pdu->user_data[i];
}
}
if (len < nr_octets * 2 + HEX_BYTE_LEN + 1) {
log_error("buffer is not large enough to hold user-data");
return -1;
}
tmp = hex_byte_encode(pdu_str, len, pdu->user_data_len);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "user-data-len", -1);
pdu_str += tmp;
len -= tmp;
for (i = 0; i < nr_octets; i++) {
hex_byte_encode(pdu_str, len, octets[i]);
pdu_str += HEX_BYTE_LEN;
}
len -= nr_octets * 2;
pdu_str[i] = '\0';
log_debug("user-data-len: 0x%02X", pdu->user_data_len);
log_debug("nr_octets: 0x%02X", nr_octets);
return pdu_str - begin;
}
int pdu_encode(char *pdu_str, size_t len, struct pdu_info *pdu)
{
char *begin = pdu_str;
char *msg_begin = pdu_str;
int tmp;
tmp = pdu_encode_addr(pdu_str, len, &pdu->smsc_addr, 1);
ENCODE_FAIL(tmp < 0, "smsc-addr", -1);
len -= tmp;
pdu_str += tmp;
msg_begin = pdu_str;
tmp = hex_byte_encode(pdu_str, len, pdu->type.type);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "type", -1);
len -= tmp;
pdu_str += tmp;
if (pdu->type.msg_type == PDU_MTI_SUBMIT ||
pdu->type.msg_type == PDU_MTI_REPORT) {
tmp = hex_byte_encode(pdu_str, len, pdu->msg_reference);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "msg-reference", -1);
len -= tmp;
pdu_str += tmp;
}
tmp = pdu_encode_addr(pdu_str, len, &pdu->addr, 0);
ENCODE_FAIL(tmp < 0, "addr", -1);
len -= tmp;
pdu_str += tmp;
switch (pdu->type.msg_type) {
case PDU_MTI_REPORT:
tmp = pdu_encode_timestamp(pdu_str, len, &pdu->timestamp);
ENCODE_FAIL(tmp < 0, "report-timestamp", -1);
len -= tmp;
pdu_str += tmp;
break;
case PDU_MTI_DELIVER:
case PDU_MTI_SUBMIT:
tmp = hex_byte_encode(pdu_str, len, pdu->protocol_id);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "protocol-id", -1);
len -= tmp;
pdu_str += tmp;
tmp = hex_byte_encode(pdu_str, len, pdu->data_coding.data_coding);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "data-coding-scheme", -1);
len -= tmp;
pdu_str += tmp;
if (pdu->type.msg_type == PDU_MTI_SUBMIT) {
switch (pdu->type.validity_period_format) {
case PDU_VPF_RELATIVE:
tmp = hex_byte_encode(pdu_str, len, pdu->validity_period);
ENCODE_FAIL(tmp != HEX_BYTE_LEN, "validity-period", -1);
len -= tmp;
pdu_str += tmp;
break;
case PDU_VPF_ENHANCED:
log_warning("PDU_VPF_ENHANCED? Falling through to absolute");
case PDU_VPF_ABSOUTE:
tmp = pdu_encode_timestamp(pdu_str, len, &pdu->timestamp);
ENCODE_FAIL(tmp < 0, "validity-period-timestamp", -1);
len -= tmp;
pdu_str += tmp;
break;
case PDU_VPF_NOT_PRESENT:
default:
break;
}
} else if (pdu->type.msg_type == PDU_MTI_DELIVER) {
tmp = pdu_encode_timestamp(pdu_str, len, &pdu->timestamp);
ENCODE_FAIL(tmp < 0, "delivery-timestamp", -1);
len -= tmp;
pdu_str += tmp;
}
tmp = pdu_encode_user_data(pdu_str, len, pdu);
ENCODE_FAIL(tmp < 0, "user-data", -1);
len -= tmp;
pdu_str += tmp;
}
pdu->msg_len = (pdu_str - msg_begin) / 2;
log_debug("msg-len: %d", pdu->msg_len);
return pdu_str - begin;
}
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