diff options
Diffstat (limited to 'openbsc/src/ipaccess/ipaccess-firmware.c')
| -rw-r--r-- | openbsc/src/ipaccess/ipaccess-firmware.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/openbsc/src/ipaccess/ipaccess-firmware.c b/openbsc/src/ipaccess/ipaccess-firmware.c new file mode 100644 index 000000000..8aba50978 --- /dev/null +++ b/openbsc/src/ipaccess/ipaccess-firmware.c @@ -0,0 +1,123 @@ +/* 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 <openbsc/ipaccess.h> +#include <osmocore/talloc.h> + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#define PART_LENGTH 138 + +static_assert(sizeof(struct sdp_header_entry) == 138, right_entry); +static_assert(sizeof(struct sdp_firmware) == 160, _right_header_length); + +/* more magic, the second "int" in the header */ +static char more_magic[] = { 0x10, 0x02 }; + +int ipaccess_analyze_file(int fd, const unsigned int st_size, const unsigned int base_offset, struct llist_head *list) +{ + struct sdp_firmware *firmware_header = 0; + struct sdp_header *header; + char buf[4096]; + int rc, i; + + rc = read(fd, buf, sizeof(*firmware_header)); + if (rc < 0) { + perror("Can not read header start."); + return -1; + } + + firmware_header = (struct sdp_firmware *) &buf[0]; + if (strncmp(firmware_header->magic, " SDP", 4) != 0) { + fprintf(stderr, "Wrong magic.\n"); + return -1; + } + + if (memcmp(firmware_header->more_magic, more_magic, 2) != 0) { + fprintf(stderr, "Wrong more magic. Got: 0x%x %x %x %x\n", + firmware_header->more_magic[0] & 0xff, firmware_header->more_magic[1] & 0xff, + firmware_header->more_magic[2] & 0xff, firmware_header->more_magic[3] & 0xff); + return -1; + } + + + if (!firmware_header) + return -1; + + if (ntohl(firmware_header->file_length) != st_size) { + fprintf(stderr, "The filesize and the header do not match.\n"); + return -1; + } + + /* add the firmware */ + header = talloc_zero(list, struct sdp_header); + header->firmware_info = *firmware_header; + INIT_LLIST_HEAD(&header->header_list); + llist_add(&header->entry, list); + + /* this semantic appears to be only the case for 0x0000 */ + if (firmware_header->more_more_magic != 0) + return -1; + + 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; + struct sdp_header_item *header_entry; + unsigned int offset = base_offset + sizeof(struct sdp_firmware); + 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; + } + + /* 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; + } + + header_entry = talloc_zero(header, struct sdp_header_item); + header_entry->header_entry = entry; + llist_add(&header_entry->entry, &header->header_list); + + ipaccess_analyze_file(fd, ntohl(entry.length), offset, list); + } + + return 0; +} + |