dahdi-tools/xpp/astribank_license.c

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/*
* Written by Oron Peled <oron@actcom.co.il>
* Copyright (C) 2012, Xorcom
*
* All rights reserved.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <xtalk/debug.h>
#include "astribank_license.h"
#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
static const struct boundary {
const char *name;
const char *markers[2];
} boundaries[] = {
[LICENSE_MARKER_NONE] = { /* Skip 0 */
},
[LICENSE_MARKER_XORCOM] = {
"Xorcom",
{
"-----BEGIN XORCOM LICENSE BLOCK-----",
"-----END XORCOM LICENSE BLOCK-----",
},
},
[LICENSE_MARKER_GENERIC] = {
"Generic",
{
"-----BEGIN TELEPHONY DEVICE LICENSE BLOCK-----",
"-----END TELEPHONY DEVICE LICENSE BLOCK-----",
}
},
};
void license_markers_help(const char *prefix, FILE *fp)
{
int i;
fprintf(fp, "%sValid license markers:\n", prefix);
for (i = LICENSE_MARKER_NONE + 1; i < ARRAY_SIZE(boundaries); i++) {
const struct boundary *b = &boundaries[i];
if (b->markers[0] != 0)
fprintf(fp, "%s\t%d - %s\n", prefix, i, b->name);
}
}
int license_marker_valid(unsigned int which)
{
if (which >= ARRAY_SIZE(boundaries))
return 0;
if (boundaries[which].markers[0] == NULL)
return 0;
return 1;
}
static const char *marker_string(unsigned int which, int end_marker)
{
int selector = (end_marker) ? 1 : 0;
if (license_marker_valid(which)) {
return boundaries[which].markers[selector];
}
ERR("gen_marker: invalid marker %d\n", which);
return NULL;
}
static int marker_find(const char *str, int end_marker)
{
int selector = (end_marker) ? 1 : 0;
int i;
for (i = LICENSE_MARKER_NONE + 1; i < ARRAY_SIZE(boundaries); i++) {
const struct boundary *b = &boundaries[i];
const char *marker_str = b->markers[selector];
#if 0
DBG("marker_find(%s,%d)[%d]: %s\n",
str, end_marker, i, marker_str);
#endif
if (!marker_str)
continue;
if (strcmp(str, marker_str) == 0)
return i;
}
return 0;
}
static int bin_to_file(void *buf, int len, FILE *f)
{
static int bytes_on_line;
unsigned char *p = buf;
if (buf == NULL) {
if (bytes_on_line != 0) {
if (fprintf(f, "\n") != 1)
return -1;
bytes_on_line = 0;
}
return 0;
}
int i;
for (i = 0; i < len; i++) {
if (fprintf(f, "%02x", *p++) != 2)
return -1;
bytes_on_line++;
if (bytes_on_line >= 16) {
if (fprintf(f, "\n") != 1)
return -1;
bytes_on_line = 0;
}
}
return 0;
}
int write_to_file(
struct eeprom_table *eeprom_table,
struct capabilities *caps,
struct capkey *key,
unsigned int marker,
FILE *f)
{
fprintf(f, "%s\n", marker_string(marker, 0));
fprintf(f, "Version: 1.0\n");
fprintf(f, "Timestamp: %u\n", caps->timestamp);
fprintf(f, "Serial: %.*s\n", LABEL_SIZE, eeprom_table->label);
fprintf(f, "Capabilities.Port.FXS: %d\n", caps->ports_fxs);
fprintf(f, "Capabilities.Port.FXO: %d\n", caps->ports_fxo);
fprintf(f, "Capabilities.Port.BRI: %d\n", caps->ports_bri);
fprintf(f, "Capabilities.Port.PRI: %d\n", caps->ports_pri);
fprintf(f, "Capabilities.Port.ECHO: %d\n", caps->ports_echo);
fprintf(f, "Capabilities.Twinstar: %d\n", CAP_EXTRA_TWINSTAR(caps));
fprintf(f, "Data:\n");
bin_to_file(eeprom_table, sizeof(*eeprom_table), f);
bin_to_file(caps, sizeof(*caps), f);
bin_to_file(key, sizeof(*key), f);
bin_to_file(NULL, 0, f);
fprintf(f, "%s\n", marker_string(marker, 1));
return 0;
}
/*
* Removes whitespace on both sizes of the string.
* Returns a pointer to the first non-space char. The string
* is modified in place to trim trailing whitespace.
* If the whole string is whitespace, returns NULL.
*/
static char *trim(char *s)
{
int len = strlen(s);
while (len > 0 && isspace(s[len-1])) {
len--;
}
if (len == 0)
return NULL;
s[len] = '\0';
while (isspace(*s))
s++;
/* *s is not a space, since in this case we'd return NULL above */
return s;
}
static int get_key_value(char *line, char **key, char **value)
{
char *p = strchr(line, ':');
if (p == NULL)
return -1;
*p = '\0';
*key = trim(line);
*value = trim(p + 1);
return 0;
}
static int hex_digit_to_int(char c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
else
return -1;
}
static int str_to_bin(char *line, void *buf, int maxlen)
{
static int offset;
unsigned char *p = buf;
if (strlen(line) % 2 != 0)
return -1;
while (offset < maxlen && *line) {
uint8_t value;
char c = hex_digit_to_int(*line++);
if (c < 0 || *line == '\0')
return -1;
value = c << 4;
c = hex_digit_to_int(*line++);
if (c < 0)
return -1;
value |= c;
p[offset++] = value;
}
if (offset == maxlen && *line)
return -1;
return offset;
}
int read_from_file(
struct eeprom_table *eeprom_table,
struct capabilities *caps,
struct capkey *capkey,
unsigned int *used_marker,
FILE *f)
{
char buf[256];
char *line, *key, *value;
int lineno = 0;
unsigned int license_marker_begin = 0;
unsigned int license_marker_end;
struct table {
struct eeprom_table eeprom_table;
struct capabilities capabilities;
struct capkey capkey;
} PACKED table;
enum PARSE_STATES {
STATE_BEFORE_LICENSE = 0,
STATE_EXPECT_VERSION = 1,
STATE_EXPECT_DATA = 2,
STATE_READ_DATA = 3,
STATE_AFTER_LICENSE = 4,
} state = STATE_BEFORE_LICENSE;
memset(&table, 0, sizeof(struct table));
/*
* states:
* 0: start - before BEGIN_LICENSE_BLOCK line. on BEGIN_LICENSE_BLOCK line goto 1.
* 1: read Version, goto 2. if not version line then error.
* 2: after BEGIN line. split line into key:value. if line is Data:, goto 3.
* 3: read binary data. if line is END_LICENSE_BLOCK goto 4.
* 4: END_LICENSE_BLOCK - ignore lines.
*/
while (fgets(buf, 256, f) != NULL) {
lineno++;
int len = strlen(buf);
if (len > 0 && buf[len-1] != '\n') {
ERR("Line %d: Line too long\n", lineno);
return -1;
}
line = trim(buf);
if (line == NULL) {
if (state > STATE_BEFORE_LICENSE && state < STATE_AFTER_LICENSE) {
ERR("Line %d: Empty line\n", lineno);
return -1;
}
else
continue;
}
switch (state) {
case STATE_BEFORE_LICENSE:
license_marker_begin = marker_find(line, 0);
if (license_marker_begin)
state = STATE_EXPECT_VERSION;
else {
ERR("Line %d: Invalid license begin block\n", lineno);
return -1;
}
break;
case STATE_EXPECT_VERSION:
if (get_key_value(line, &key, &value) < 0) {
ERR("Line %d: Can't parse line\n", lineno);
return -1;
}
if (strcmp(key, "Version") == 0) {
if (strcmp(value, "1.0") == 0) {
state = STATE_EXPECT_DATA;
} else {
ERR("Line %d: Unknown license file version '%s', need version '1.0'\n", lineno, value);
return -1;
}
} else {
ERR("Line %d: No license file version\n", lineno);
return -1;
}
break;
case STATE_EXPECT_DATA:
if (get_key_value(line, &key, &value) < 0) {
ERR("Line %d: Can't parse line\n", lineno);
return -1;
}
if (strcmp(key, "Data") == 0) {
state = STATE_READ_DATA;
break;
}
break;
case STATE_READ_DATA:
license_marker_end = marker_find(line, 1);
if (license_marker_end) {
if (license_marker_end != license_marker_begin) {
ERR("Line %d: End marker != Begin marker\n", lineno);
return -1;
}
state = STATE_AFTER_LICENSE;
break;
}
if (str_to_bin(line, &table, sizeof(table)) < 0) {
ERR("Line %d: Error in data block\n", lineno);
return -1;
}
break;
case STATE_AFTER_LICENSE:
break;
}
}
if (state != STATE_AFTER_LICENSE) {
ERR("Invalid license file\n");
return -1;
}
memcpy(eeprom_table, &table.eeprom_table, sizeof(*eeprom_table));
memcpy(caps, &table.capabilities, sizeof(*caps));
memcpy(capkey, &table.capkey, sizeof(*capkey));
return 0;
}