X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=src%2Finspect.c;h=be98b0ddaf4cec718639ef813642f5f301c47f84;hb=3a84e0784e1e3ab7b56850d0f8c9aa42f1ae3da1;hp=154207b9a7f34020eea82681fbd9327af6686d16;hpb=9e7c6a548353bde925c16434711bcc6208038d83;p=libguestfs.git diff --git a/src/inspect.c b/src/inspect.c index 154207b..be98b0d 100644 --- a/src/inspect.c +++ b/src/inspect.c @@ -26,6 +26,7 @@ #include #include #include +#include #ifdef HAVE_PCRE #include @@ -230,6 +231,7 @@ static int check_windows_root (guestfs_h *g, struct inspect_fs *fs); static int check_windows_arch (guestfs_h *g, struct inspect_fs *fs); static int check_windows_software_registry (guestfs_h *g, struct inspect_fs *fs); static int check_windows_system_registry (guestfs_h *g, struct inspect_fs *fs); +static char *map_registry_disk_blob (guestfs_h *g, const char *blob); static char *case_sensitive_path_silently (guestfs_h *g, const char *); static int is_file_nocase (guestfs_h *g, const char *); static int is_dir_nocase (guestfs_h *g, const char *); @@ -1616,7 +1618,7 @@ check_windows_system_registry (guestfs_h *g, struct inspect_fs *fs) hive_node_h root, node; hive_value_h value, *values = NULL; int32_t dword; - size_t i; + size_t i, count; if (download_to_tmp (g, system_path, system_local, MAX_REGISTRY_SIZE) == -1) goto out; @@ -1658,6 +1660,69 @@ check_windows_system_registry (guestfs_h *g, struct inspect_fs *fs) dword = hivex_value_dword (h, value); fs->windows_current_control_set = safe_asprintf (g, "ControlSet%03d", dword); + /* Get the drive mappings. + * This page explains the contents of HKLM\System\MountedDevices: + * http://www.goodells.net/multiboot/partsigs.shtml + */ + errno = 0; + node = hivex_node_get_child (h, root, "MountedDevices"); + if (node == 0) { + if (errno != 0) + perrorf (g, "hivex_node_get_child"); + else + error (g, "hivex: could not locate HKLM\\SYSTEM\\MountedDevices"); + goto out; + } + + values = hivex_node_values (h, node); + + /* Count how many DOS drive letter mappings there are. This doesn't + * ignore removable devices, so it overestimates, but that doesn't + * matter because it just means we'll allocate a few bytes extra. + */ + for (i = count = 0; values[i] != 0; ++i) { + char *key = hivex_value_key (h, values[i]); + if (key == NULL) { + perrorf (g, "hivex_value_key"); + goto out; + } + if (STRCASEEQLEN (key, "\\DosDevices\\", 12) && + c_isalpha (key[12]) && key[13] == ':') + count++; + } + + fs->drive_mappings = calloc (2*count + 1, sizeof (char *)); + if (fs->drive_mappings == NULL) { + perrorf (g, "calloc"); + goto out; + } + + for (i = count = 0; values[i] != 0; ++i) { + char *key = hivex_value_key (h, values[i]); + if (key == NULL) { + perrorf (g, "hivex_value_key"); + goto out; + } + if (STRCASEEQLEN (key, "\\DosDevices\\", 12) && + c_isalpha (key[12]) && key[13] == ':') { + /* Get the binary value. Is it a fixed disk? */ + char *blob, *device; + size_t len; + hive_type type; + + blob = hivex_value_value (h, values[i], &type, &len); + if (blob != NULL && type == 3 && len == 12) { + /* Try to map the blob to a known disk and partition. */ + device = map_registry_disk_blob (g, blob); + if (device != NULL) { + fs->drive_mappings[count++] = safe_strndup (g, &key[12], 1); + fs->drive_mappings[count++] = device; + } + } + free (blob); + } + } + /* Get the hostname. */ const char *hivepath[] = { fs->windows_current_control_set, "Services", "Tcpip", "Parameters" }; @@ -1709,6 +1774,75 @@ check_windows_system_registry (guestfs_h *g, struct inspect_fs *fs) return ret; } +/* Windows Registry HKLM\SYSTEM\MountedDevices uses a blob of data + * to store partitions. This blob is described here: + * http://www.goodells.net/multiboot/partsigs.shtml + * The following function maps this blob to a libguestfs partition + * name, if possible. + */ +static char * +map_registry_disk_blob (guestfs_h *g, const char *blob) +{ + char **devices = NULL; + struct guestfs_partition_list *partitions = NULL; + char *diskid; + size_t i, j, len; + char *ret = NULL; + uint64_t part_offset; + + /* First 4 bytes are the disk ID. Search all devices to find the + * disk with this disk ID. + */ + devices = guestfs_list_devices (g); + if (devices == NULL) + goto out; + + for (i = 0; devices[i] != NULL; ++i) { + /* Read the disk ID. */ + diskid = guestfs_pread_device (g, devices[i], 4, 0x01b8, &len); + if (diskid == NULL) + continue; + if (len < 4) { + free (diskid); + continue; + } + if (memcmp (diskid, blob, 4) == 0) { /* found it */ + free (diskid); + goto found_disk; + } + free (diskid); + } + goto out; + + found_disk: + /* Next 8 bytes are the offset of the partition in bytes(!) given as + * a 64 bit little endian number. Luckily it's easy to get the + * partition byte offset from guestfs_part_list. + */ + part_offset = le64toh (* (uint64_t *) &blob[4]); + + partitions = guestfs_part_list (g, devices[i]); + if (partitions == NULL) + goto out; + + for (j = 0; j < partitions->len; ++j) { + if (partitions->val[j].part_start == part_offset) /* found it */ + goto found_partition; + } + goto out; + + found_partition: + /* Construct the full device name. */ + ret = safe_asprintf (g, "%s%d", devices[i], partitions->val[j].part_num); + + out: + if (devices) + guestfs___free_string_list (devices); + if (partitions) + guestfs_free_partition_list (partitions); + return ret; +} + static char * case_sensitive_path_silently (guestfs_h *g, const char *path) { @@ -2178,6 +2312,42 @@ guestfs__inspect_get_filesystems (guestfs_h *g, const char *root) return ret; } +char ** +guestfs__inspect_get_drive_mappings (guestfs_h *g, const char *root) +{ + char **ret; + size_t i, count; + struct inspect_fs *fs; + + fs = search_for_root (g, root); + if (!fs) + return NULL; + + /* If no drive mappings, return an empty hashtable. */ + if (!fs->drive_mappings) + count = 0; + else { + for (count = 0; fs->drive_mappings[count] != NULL; count++) + ; + } + + ret = calloc (count+1, sizeof (char *)); + if (ret == NULL) { + perrorf (g, "calloc"); + return NULL; + } + + /* We need to make a deep copy of the hashtable since the caller + * will free it. + */ + for (i = 0; i < count; ++i) + ret[i] = safe_strdup (g, fs->drive_mappings[i]); + + ret[count] = NULL; + + return ret; +} + char * guestfs__inspect_get_package_format (guestfs_h *g, const char *root) { @@ -2972,6 +3142,12 @@ guestfs__inspect_get_filesystems (guestfs_h *g, const char *root) NOT_IMPL(NULL); } +char ** +guestfs__inspect_get_drive_mappings (guestfs_h *g, const char *root) +{ + NOT_IMPL(NULL); +} + char * guestfs__inspect_get_package_format (guestfs_h *g, const char *root) { @@ -3040,6 +3216,8 @@ guestfs___free_inspect_info (guestfs_h *g) free (g->fses[i].fstab[j].mountpoint); } free (g->fses[i].fstab); + if (g->fses[i].drive_mappings) + guestfs___free_string_list (g->fses[i].drive_mappings); } free (g->fses); g->nr_fses = 0;