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/* Routines for parsing an ipacces SDP firmware file */
/* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <openbsc/debug.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define PART_LENGTH 138
struct sdp_firmware_start {
char magic[4];
char more_magic[2];
u_int16_t more_more_magic;
} __attribute__((packed));
struct sdp_firmware {
u_int32_t header_length;
u_int32_t file_length;
char sw_part[20];
char text1[64];
char time[12];
char date[14];
char text2[10];
char text3[20];
u_int8_t dummy[2];
u_int16_t part_length;
/* stuff i don't know */
} __attribute__((packed));
struct sdp_header_entry {
u_int16_t something1;
char text1[64];
char time[12];
char date[14];
char text2[10];
char text3[20];
u_int32_t length;
u_int32_t addr1;
u_int32_t addr2;
u_int32_t start;
} __attribute__((packed));
static_assert(sizeof(struct sdp_header_entry) == 138, right_entry);
static_assert(sizeof(struct sdp_firmware_start) + sizeof(struct sdp_firmware) == 160, _right_header_length);
/* more magic, the second "int" in the header */
static char more_magic[] = { 0x10, 0x02 };
static int analyze_file(int fd, const unsigned int st_size, const unsigned int base_offset)
{
struct sdp_firmware_start *firmware_start;
struct sdp_firmware *firmware_header = 0;
char buf[4096];
int rc, i;
unsigned int start_offset = 0;
rc = read(fd, buf, sizeof(*firmware_start));
if (rc < 0) {
perror("Can not read header start.");
return -1;
}
firmware_start = (struct sdp_firmware_start *) &buf[0];
if (strncmp(firmware_start->magic, " SDP", 4) != 0) {
fprintf(stderr, "Wrong magic.\n");
return -1;
}
start_offset = sizeof(*firmware_start);
if (memcmp(firmware_start->more_magic, more_magic, 2) == 0) {
rc = read(fd, &buf[start_offset], sizeof(*firmware_header));
if (rc != sizeof(*firmware_header)) {
perror("Can not read header.");
return -1;
}
firmware_header = (struct sdp_firmware *) &buf[start_offset];
start_offset += sizeof(*firmware_header);
} else {
fprintf(stderr, "Wrong more magic. Got: 0x%x %x %x %x\n",
firmware_start->more_magic[0] & 0xff, firmware_start->more_magic[1] & 0xff,
firmware_start->more_magic[2] & 0xff, firmware_start->more_magic[3] & 0xff);
return -1;
}
if (!firmware_header)
return -1;
printf("Printing header information:\n");
printf("more_more_magic: 0x%x\n", ntohs(firmware_start->more_more_magic));
printf("header_length: %u\n", ntohl(firmware_header->header_length));
printf("file_length: %u\n", ntohl(firmware_header->file_length));
printf("sw_part: %.20s\n", firmware_header->sw_part);
printf("text1: %.64s\n", firmware_header->text1);
printf("time: %.12s\n", firmware_header->time);
printf("date: %.14s\n", firmware_header->date);
printf("text2: %.10s\n", firmware_header->text2);
printf("text3: %.20s\n", firmware_header->text3);
if (ntohl(firmware_header->file_length) != st_size) {
fprintf(stderr, "The filesize and the header do not match.\n");
return -1;
}
/* this semantic appears to be only the case for 0x0000 */
if (firmware_start->more_more_magic != 0)
return -1;
printf("items: %u (rest %u)\n", ntohs(firmware_header->part_length) / PART_LENGTH,
ntohs(firmware_header->part_length) % PART_LENGTH);
if (ntohs(firmware_header->part_length) % PART_LENGTH != 0) {
fprintf(stderr, "The part length seems to be wrong.\n");
return -1;
}
/* look into each firmware now */
for (i = 0; i < ntohs(firmware_header->part_length) / PART_LENGTH; ++i) {
struct sdp_header_entry entry;
unsigned int offset = start_offset + base_offset;
offset += i * 138;
if (lseek(fd, offset, SEEK_SET) != offset) {
fprintf(stderr, "Can not seek to the offset: %u.\n", offset);
return -1;
}
rc = read(fd, &entry, sizeof(entry));
if (rc != sizeof(entry)) {
fprintf(stderr, "Can not read the header entry.\n");
return -1;
}
printf("Header Entry: %d\n", i);
printf("\tsomething1: %u\n", ntohs(entry.something1));
printf("\ttext1: %.64s\n", entry.text1);
printf("\ttime: %.12s\n", entry.time);
printf("\tdate: %.14s\n", entry.date);
printf("\ttext2: %.10s\n", entry.text2);
printf("\ttext3: %.20s\n", entry.text3);
printf("\taddr1: 0x%x\n", entry.addr1);
printf("\taddr2: 0x%x\n", entry.addr2);
printf("\tstart: 0x%x\n", ntohl(entry.start));
printf("\tlength: 0x%x\n", ntohl(entry.length));
/* now we need to find the SDP file... */
offset = ntohl(entry.start) + 4 + base_offset;
if (lseek(fd, offset, SEEK_SET) != offset) {
perror("can't seek to sdp");
return -1;
}
printf("------> parsing\n");
analyze_file(fd, ntohl(entry.length), offset);
printf("<------ parsing\n");
}
return 0;
}
int main(int argc, char** argv)
{
int i, fd;
struct stat stat;
for (i = 1; i < argc; ++i) {
printf("Opening possible firmware '%s'\n", argv[i]);
fd = open(argv[i], O_RDONLY);
if (!fd) {
perror("nada");
continue;
}
/* verify the file */
if (fstat(fd, &stat) == -1) {
perror("Can not stat the file");
return EXIT_FAILURE;
}
analyze_file(fd, stat.st_size, 0);
}
return EXIT_SUCCESS;
}
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