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8fc8fa80899c66937979cd5b807766a40b74cd13
irix-657m-src/eoe/cmd/mountcd/iso.c
calmsacibis995 8fc8fa8089 Source code upload
2022-09-29 17:59:04 +03:00

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/*
* iso.c
*
* Description:
* Routines called from nfs_server that know all about the iso 9660
* file system format
*
* Note:
* Thie file descriptor of a directory is The disc offset in
* bytes of its self-referential directory entry. It used to be
* the directory entry in the parent directory, but there are
* some buggy CDs out there that have bogus ".." entries that
* messed up that scheme. --rogerc 3/20/96
*
* Caching:
* Directory and extended attribute blocks are cached in the
* cdrom module. Data file blocks are not cached; client NFS
* takes care of this, so there's no need to use the memory.
* This module controls which blocks are cached via the last
* parameter to cd_read.
*
* History:
* rogerc 12/21/90 Created
* rogerc 01/25/91 Cache only directory blocks
* rogerc 01/25/91 Changes for gfs
* rogerc 04/02/91 Adding support for High Sierra
* rogerc 02/12/92 Added support for block sizes other than
* 2048
*/
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sysmacros.h>
#include <netinet/in.h>
#include <rpc/rpc.h>
#include <rpc/svc.h>
#include <rpcsvc/ypclnt.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <filehdr.h>
#include <ctype.h>
#include <exportent.h>
#include <netdb.h>
#include <elf.h>
#include "iso.h"
#include "util.h"
#include "main.h"
#define ROOT_DIR() (cd_voldesc(cd) + (int)&((struct p_vol_desc *)(0))->root)
#define HS_ROOT_DIR() (cd_voldesc(cd) + (int)&((hsvol_t *)(0))->root)
#define ISO_MAXNAMLEN (30 + 2 + 5)
#define PERM_RALL 0444
#define PERM_XALL 0111
#define PERM_RXALL 0555
#define max(a,b) ((a) < (b) ? (b) : (a))
#define CHARSTOLONG(chars) ((chars)[0] << 24 | (chars)[1] << 16 \
| (chars)[2] << 8 | (chars)[3])
#define CHARSTOSHORT(chars) (chars[0] << 8 | chars[1])
#define DIRTOFILE(dirp,fp) {\
(fp)->block = CHARSTOLONG((dirp)->ext_loc_msb);\
(fp)->xattr_len = (dirp)->xattr_len;\
(fp)->int_gap = (dirp)->int_gap;\
(fp)->fu_size = (dirp)->fu_size;\
}
#define ISLASTDIRENT(dirp,ent,contents,len) \
(!((char *)ent-((char *)contents) < len - dirp->xattr_len && ent->len_dir))
/*
* Construct a file descriptor given the directory entry of its
* parent, the address of its contents (base), the offset into the
* contents of the directory entry (dirp), and the block size of the cd.
*/
#define MKFD(parent,base,dirp,blksize) \
(dirp && (((dir_t *)dirp)->flags & FFLAG_DIRECTORY) \
? ((CHARSTOLONG(((dir_t *)dirp)->ext_loc_msb) \
+ ((dir_t *)dirp)->xattr_len) * blksize) \
: ((CHARSTOLONG(parent->ext_loc_msb) + parent->xattr_len) * blksize \
+ ((char *)dirp - (char *)base)))
#ifdef DEBUG
#define ISODBG(x) {if (isodebug) {x;}}
#else
#define ISODBG(x)
#endif
#define FLAGS(d) (fsType == ISO ? ((dir_t *)d)->flags : \
((hsdir_t *)d)->flags)
#define IS_LEAPYEAR(year) \
((year%4 == 0) && ((year%100 != 0) || (year%400 == 0)))
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
/*
* Special stuff so we can recognize SUN executables. This is the
* format of the executable file header on a 68000 or SPARC based
* SUN system. Their 386i line is handled by COFF.
*/
#define sun
struct exec {
#ifdef sun
unsigned char a_dynamic:1; /* has a __DYNAMIC */
unsigned char a_toolversion:7;/* version of toolset
used to create this file */
unsigned char a_machtype; /* machine type */
unsigned short a_magic; /* magic number */
#else
unsigned long a_magic; /* magic number */
#endif
unsigned long a_text; /* size of text segment */
unsigned long a_data; /* size of initialized data */
unsigned long a_bss; /* size of uninitialized data */
unsigned long a_syms; /* size of symbol table */
unsigned long a_entry; /* entry point */
unsigned long a_trsize; /* size of text relocation */
unsigned long a_drsize; /* size of data relocation */
};
#define OMAGIC 0407 /* old impure format */
#define NMAGIC 0410 /* read-only text */
#define ZMAGIC 0413 /* demand load format */
#define N_BADMAG(x) \
((x).a_magic!=OMAGIC && (x).a_magic!=NMAGIC && (x).a_magic!=ZMAGIC)
#undef sun
/*
* Sometimes we need to differentiate between iso9660 and high sierra
*/
typedef enum cdtype { ISO, HSFS } cdtype_t;
/*
* Structure that we parse rock ridge extensions into. The flags at
* the beginning get set when we encounter the corresponding system
* use record; we need this because not all fields are necessarily
* present and we need to know to fall back onto base ISO 9660.
*/
typedef struct _ext {
unsigned int gotName : 1;
unsigned int gotPath : 1;
unsigned int gotMode : 1;
unsigned int gotATime : 1, gotMTime : 1, gotCTime : 1;
unsigned int isRelocated : 1;
unsigned int doSlash : 1;
char name[NFS_MAXNAMLEN];
char path[NFS_MAXNAMLEN];
u_int mode;
u_int nlink;
u_int uid, gid;
ftype type;
nfstime atime, mtime, ctime;
u_int rdev;
int parent, child;
} EXT;
static char dot[] = ".";
static char dotdot[] = "..";
/*
* "notranslate" controls the "to_unixname" name translation.
*
* 'c' = the user will see raw, ugly file names
* 'l' = the user will see lower-case, ugly file names
* 'm' = the user will see upper-case names less the version #
* 'x' = the user will see lower-case names less the version #
*/
static char notranslate = 'x'; /* The internal default, */
/* acts like 'l'+'m' */
/*
* if setx == 1, we'll blindly set execute permissions for every file.
*/
static int setx = 0;
static int def_num_blocks = 256; /* backup default */
static int useCache = 1;
/*
* By default, use rock ridge extensions if they're there.
*/
static int useExt = 1;
/*
* Whether or not CD has extensions
*/
static int hasExt = 0;
/*
* Number of bytes in each system use area to skip
*/
static int skipSysBytes = 0;
/*
* The location on the CD of the '.' entry of the root directory.
* This is use in ext_first_field when reading Rock Ridge extensions
* to determine whether or not to skip skipSysBytes.
*/
static int rootSelfEntry = 0;
int isodebug = 0;
/*
* Stuff for the cdrom module
*/
static CDROM *cd;
/*
* Number of blocks in the mounted file system
*/
static int fsBlocks;
/*
* Type of file system - iso9660 or high sierra
*/
static cdtype_t fsType;
/*
* The root file handle of the mounted file system
*/
static fhandle_t rootfh;
/*
* The path name of the mount point of the file system
*/
static char *mountPoint;
/*
* Forward declarations of static functions
*/
static int set_blocks();
static int get_parent_fd(int fd, int *fdp);
static void add_entry(entry *entries, int fd, char *name, int
name_len, int cookie);
static int read_dir(dir_t *dirp, int dirfd, dir_t **datap, int *len);
static int read_dir_entry(int fd, dir_t **dpp);
static void convert_time(struct nfstime *to, struct date_time *from,
enum cdtype type);
static int convert_to_seconds(int year, int month, int day, int hour,
int min, int sec, int csec, int gw);
static int valid_day(int day, int month, int year);
static int days_so_far(int day, int month, int year);
static char * to_unixname(char *name, int length);
/*
* Rock Ridge support functions
*/
static void check_for_extensions(void);
static void ext_parse_extensions(dir_t *dirp, int fd, EXT *ext);
static int ext_get_relo_dir(EXT *ext, dir_t *inDir, int infd,
dir_t **outDir, int *outfd);
/*
* Support for keeping one directory entry privately "cached".
*/
static int read_dir_entry_cached(int fd, dir_t **dpp, multi_xtnt_t **mpp);
static int dirc_hit = 0;
static int dirc_miss = 0;
static int dirc_last_fd = -1;
static dir_t *dirc_dirp = NULL;
static multi_xtnt_t *dirc_mep = NULL;
/*
* Level 3 (Multi-Extent) support data & functions
*/
/*
* Must be a power of 2!
*/
#define MULTI_XTNT_HASH_SIZE 16
/*
* Most (all that I've seen) fileid's are even numbers,
* so drop the bottom bit in the hash function.
*/
#define MULTI_XTNT_HASH(Fd) ((Fd >> 1) & (MULTI_XTNT_HASH_SIZE-1))
static multi_xtnt_t *multi_extent_head[MULTI_XTNT_HASH_SIZE];
static multi_xtnt_t *multi_extent_tail[MULTI_XTNT_HASH_SIZE];
static void
iso_me_add_xtnt(multi_xtnt_t *mep,
int fileid,
int blksize,
int start_blk,
int length)
{
one_xtnt_t *oep;
oep = safe_malloc(sizeof(one_xtnt_t));
oep->oe_fileid = fileid;
oep->oe_start_blk = start_blk;
oep->oe_length = length;
oep->oe_next = NULL;
oep->oe_start_byte = mep->me_length;
mep->me_length += length;
mep->me_num_xtnts++;
if (mep->me_xtnts_head == NULL) {
mep->me_xtnts_head = oep;
mep->me_xtnts_tail = oep;
} else {
mep->me_xtnts_tail->oe_next = oep;
mep->me_xtnts_tail = oep;
}
}
static multi_xtnt_t *
iso_me_add_file(int fileid)
{
int hash;
multi_xtnt_t *mep;
hash = MULTI_XTNT_HASH(fileid);
/*
* Scan the chain to see if we already "know" this guy.
*/
for (mep = multi_extent_head[hash]; mep != NULL; mep = mep->me_next) {
if (mep->me_fileid == fileid)
return mep;
}
/*
* Not found, so make a new one.
*/
mep = safe_malloc(sizeof(multi_xtnt_t));
mep->me_fileid = fileid;
mep->me_next = NULL;;
mep->me_xtnts_head = NULL;
mep->me_xtnts_tail = NULL;
mep->me_length = 0;
mep->me_num_xtnts = 0;
if (multi_extent_head[hash] == NULL) {
multi_extent_head[hash] = mep;
multi_extent_tail[hash] = mep;
} else {
multi_extent_tail[hash]->me_next = mep;
multi_extent_tail[hash] = mep;
}
return mep;
}
static multi_xtnt_t *
iso_me_search(int fileid)
{
int hash;
multi_xtnt_t *mep;
hash = MULTI_XTNT_HASH(fileid);
/*
* Scan the chain to see if we already "know" this guy.
*/
for (mep = multi_extent_head[hash]; mep != NULL; mep = mep->me_next) {
if (mep->me_fileid == fileid)
return mep;
}
return NULL;
}
void
iso_me_flush()
{
int hash;
multi_xtnt_t *mep;
multi_xtnt_t *mep2free;
one_xtnt_t *oep;
one_xtnt_t *oep2free;
ISODBG(fprintf(stderr, ">>>>iso: iso_me_flush\n"));
/*
* Scan the chains
*/
for (hash = 0; hash < MULTI_XTNT_HASH_SIZE; hash++) {
mep = multi_extent_head[hash];
while (mep) {
mep2free = mep;
oep = mep->me_xtnts_head;
while (oep) {
oep2free = oep;
oep = oep->oe_next;
free(oep2free);
}
mep = mep->me_next;
free(mep2free);
}
multi_extent_head[hash] = NULL;
multi_extent_tail[hash] = NULL;
}
}
void
iso_me_dump()
{
int i;
int hash;
multi_xtnt_t *mep;
one_xtnt_t *oep;
/*
* Scan the chains
*/
for (hash = 0; hash < MULTI_XTNT_HASH_SIZE; hash++) {
for (mep = multi_extent_head[hash];
mep != NULL;
mep = mep->me_next) {
fprintf(stderr,
">>>>iso: iso_me_dump: MULTI[%d] fileid/%d numxtnts/%d length/%d\n",
hash, mep->me_fileid, mep->me_num_xtnts,
mep->me_length);
i = 0;
oep = mep->me_xtnts_head;
while (oep) {
fprintf(stderr,
">>>>iso: iso_me_dump: %d: fd/%d stblk/%d start/%d length/%d\n",
i++, oep->oe_fileid,
oep->oe_start_blk,
oep->oe_start_byte,
oep->oe_length);
oep = oep->oe_next;
}
}
}
}
/*
* static dir_t *
* skip_zero_dir(dir_t *dp, contents, len, int blksize)
*
* Description:
* Skip past zero filled bits at the end of a block in a
* directory. directory entries are supposed to end in the same
* block in which they begin, so if there's some space left over
* but not enough to hold an entire directory entry we need to
* skip over that space to the beginning of the next block.
*
* Parameters:
* dp Points to a directory entry
* contents Pointer to the beginning of the directory into which
* dp points
* len len of the directory pointed to by contents
* blksize Size of a block on this CD
*
* Returns:
* dp if it fits
*/
static dir_t *
skip_zero_dir(dir_t *dp, dir_t *contents, int len, int blksize)
{
int block;
if (!dp->len_dir && (char *)dp - (char *)contents < len) {
/*
* Directories are supposed to end in the same block in
* which they begin, so this starts at the next block. The
* zero in dp->len_dir is zero fill from the unused portion of
* a block in the middle of a directory.
*/
block = ((char *)dp - (char *)contents +
blksize - 1) / blksize;
if (block * blksize < len) {
dp = (dir_t *)
((char *)contents + block * blksize);
}
}
return dp;
}
/*
* static dir_t *
* first_dir(dir_t *dirp, dir_t *contents, int len, int cookie, int blksize)
*
* Description:
* Return the first directory entry found in contents, or the
* directory entry found cookie bytes into the contents.
*
* Parameters:
* dirp dir_t structure of directory whose contents we're
* looking at
* contents Contents of the directory
* len length of contents
* cookie Byte offset into the directory to start. This
* exists because of the way nfs does readdir.
* blksize The blocksize used by the CD. This is needed for
* calculating when we've reached the end of a block
*
* Returns:
* Pointer to the first directory entry in contents
*/
static dir_t *
first_dir(dir_t *dirp, dir_t *contents, int len, int cookie, int blksize)
{
dir_t *dp;
int block;
dp = (dir_t *)((char *)contents + cookie);
dp = skip_zero_dir(dp, contents, len, blksize);
return ISLASTDIRENT(dirp, dp, contents, len) ? NULL : dp;
}
/*
* static dir_t *
* next_dir(dir_t *dirp, dir_t *dp, dir_t *contents, int len, int blksize)
*
* Description:
* Return a pointer to the next entry in a directory after dp, or
* NULL if dp is the last entry.
*
* Parameters:
* dirp directory whose contents we're searching
* dp dp before the one we want
* contents contents of the directory
* len length of the directory contents
* blksize The blocksize used by the CD. This is needed for
* calculating when we've reached the end of a block
*
* Returns:
* pointer to next directory, NULL if dp was the last one.
*/
static dir_t *
next_dir(dir_t *dirp, dir_t *dp, dir_t *contents, int len, int blksize)
{
int block;
dp = (dir_t *)((char *)dp + dp->len_dir);
dp = skip_zero_dir(dp, contents, len, blksize);
return ISLASTDIRENT(dirp, dp, contents, len) ? NULL : dp;
}
/*
* void
* iso_init(void)
*
* Description:
* Initialization for the iso module
*/
void
iso_init(int num_blocks)
{
int i;
def_num_blocks = num_blocks;
useCache = useCache && num_blocks > 0;
for (i = 0; i < MULTI_XTNT_HASH_SIZE; i++) {
multi_extent_head[i] = NULL;
multi_extent_tail[i] = NULL;
}
}
/*
* int
* iso_numblocks(unsigned int *blocks)
*
* Description:
* Fill in blocks with the number of blocks in the file system
*
* Parameters:
* blocks receives # of blocks
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_numblocks(unsigned int *blocks)
{
int error, changed;
error = cd_media_changed(cd, &changed);
if (error)
return error;
if (changed) {
cd_flush_cache(cd);
iso_me_flush();
}
error = set_blocks();
if (error)
return error;
*blocks = (unsigned int)fsBlocks;
ISODBG(fprintf(stderr, ">>>>iso: iso_numblocks() == %d\n", *blocks));
return 0;
}
/*
* int
* iso_isfd(int fd)
*
* Description:
* Determine whether fd is a file descriptor that we care about, so
* that the caller knows not to close it
*
* Parameters:
* fd file descriptor
*
* Returns:
* 1 if we care, 0 if we don't
*/
int
iso_isfd(int fd)
{
return cd_is_dsp_fd(cd, fd);
}
/*
* int
* iso_openfs(char *dev, char *mntpnt, int flags, int partition)
*
* Description:
* Get ready to mount the dev on mntpnt
*
* Parameters:
* dev Device for CD-ROM drive
* mntpnt The mount point
* root gets root file handle
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_openfs(char *dev, char *mntpnt, fhandle_t *root)
{
int error;
static dev_t fakedev = 1;
struct stat sb;
ISODBG(fprintf(stderr, ">>>>iso: iso_addfs(%s)\n", dev));
error = cd_open(dev, def_num_blocks, &cd);
if (error)
return error;
error = cd_stat(cd, &sb);
if (error)
return error;
rootfh.fh_dev = S_ISREG(sb.st_mode) ? 0xff00 | (fakedev++ & 0xff)
: sb.st_rdev;
mountPoint = strdup(mntpnt);
error = set_blocks();
/*
* We need to do this so that the user can eject.
*/
if (error) {
cd_close(cd);
} else {
bcopy(&rootfh, root, sizeof *root);
}
return error;
}
/*
* void
* iso_removefs()
*
* Description:
* ISO 9660 specific removal of a generic file system
*
* Parameters:
*/
void
iso_removefs()
{
cd_close(cd);
ISODBG( iso_me_dump() );
ISODBG(fprintf(stderr, ">>>>iso: read_dir_cached: hits/%d misses/%d\n",
dirc_hit, dirc_miss));
}
/*
* int
* iso_lookup(fhandle_t *fh, char *name, fhandle_t *fh_ret)
*
* Description:
* Look for name in fh (a directory); if found, fill in fh_ret
*
* Parameters:
* fh file handle of directory in which to look
* name name of file we're looking for
* fh_ret Receive handle for name
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_lookup(fhandle_t *fh, char *name, fhandle_t *fh_ret)
{
int blksize;
int multi_seen = 0;
int error, fd, tmpfd, len, dirfd, newfd;
char *uname;
dir_t *dirp; /* directory entry for dir */
dir_t *contents; /* contents of dir */
dir_t *dp; /* pointer into contents */
dir_t *newdirp;
EXT ext;
ISODBG(fprintf(stderr, ">>>>iso: iso_lookup(%d, %s)\n", fh->fh_fno, name));
blksize = cd_get_blksize(cd);
if (strcmp(name, dot) == 0) {
*fh_ret = *fh;
return 0;
} else if (strcmp(name, dotdot) == 0) {
error = get_parent_fd(fh->fh_fno, &fd);
if (error)
return error;
bzero(fh_ret, sizeof *fh_ret);
fh_ret->fh_dev = fh->fh_dev;
fh_ret->fh_fid.lfid_fno = fd;
fh_ret->fh_fid.lfid_len =
sizeof fh_ret->fh_fid - sizeof fh_ret->fh_fid.lfid_len;
return 0;
}
error = read_dir_entry(fh->fh_fno, &dirp);
if (error)
return error;
dirfd = fh->fh_fno;
if (hasExt && useExt) {
ext_parse_extensions(dirp, dirfd, &ext);
error = ext_get_relo_dir(&ext, dirp, dirfd, &newdirp, &newfd);
if (error) {
free(dirp);
return error;
}
if (dirp != newdirp) {
free(dirp);
dirp = newdirp;
dirfd = newfd;
}
}
error = read_dir(dirp, dirfd, &contents, &len);
if (error) {
free(dirp);
return error;
}
fd = 0;
for (dp = first_dir(dirp, contents, len, 0, blksize);
dp;
dp = next_dir(dirp, dp, contents, len, blksize)) {
tmpfd = MKFD(dirp, contents, dp, blksize);
/*
* Skip associated files
*/
if (dp->flags & FFLAG_ASSOC)
continue;
if (useExt && hasExt) {
ext_parse_extensions(dp, tmpfd, &ext);
/*
* Skip relocated directories
*/
if (ext.isRelocated) {
continue;
}
uname = ext.gotName ? ext.name
: to_unixname(dp->file_id, dp->len_fi);
} else {
uname = to_unixname(dp->file_id, dp->len_fi);
}
if (strcmp(name, uname) == 0) {
/*
* Only "remember" the fd of the 1st of
* a series for Multi-Extent files.
*/
/*
* Do the mapping and return the inode number of the relocated child
* as opposed to the original number. Why? Places like getcwd()
* do keep track of the inode numbers to make sure that child directories
* inode numbers show up in a read of the parent's directory, which isn't
* the case if the mapping is not done.
*/
if (! fd) {
fd = (useExt && hasExt && ext.child) ? ext.child * blksize : tmpfd;
}
if (dp->flags & FFLAG_MULTI) {
multi_xtnt_t *mep;
/*
* Check to see if we already know the extents for this file.
*/
if (! multi_seen) { /* 1st extent? */
mep = iso_me_search(fd); /* Try to find them */
if (mep) { /* If we found them: */
ISODBG(fprintf(stderr,
">>>>iso: iso_lookup: MULTI already built fd/%d\n",
fh->fh_fno));
break; /* that's all we need */
}
}
multi_seen++; /* Into multi-extents */
/* mode */
mep = iso_me_add_file(fd);
iso_me_add_xtnt(mep, tmpfd, blksize,
CHARSTOLONG(dp->ext_loc_msb),
CHARSTOLONG(dp->data_len_msb));
ISODBG(fprintf(stderr,
">>>>iso: iso_lookup: MULTI=1 fd/%d tmpfd/%d ext_loc_msb/%d xattr_len/%d size/%d\n",
fd, tmpfd,
CHARSTOLONG(dp->ext_loc_msb),
dp->xattr_len,
CHARSTOLONG(dp->data_len_msb)));
continue; /* Read the next directory entry */
} else {
multi_xtnt_t *mep;
/*
* Are we scanning a set of multi-extent entries?
*/
if (! multi_seen)
break;
mep = iso_me_add_file(fd);
iso_me_add_xtnt(mep, tmpfd, blksize,
CHARSTOLONG(dp->ext_loc_msb),
CHARSTOLONG(dp->data_len_msb));
ISODBG(fprintf(stderr,
">>>>iso: iso_lookup: MULTI=0 fd/%d tmpfd/%d ext_loc_msb/%d xattr_len/%d size/%d\n",
fd, tmpfd,
CHARSTOLONG(dp->ext_loc_msb),
dp->xattr_len,
CHARSTOLONG(dp->data_len_msb)));
break; /* We've read enough */
}
}
}
free(dirp);
free(contents);
if (fd) {
bzero(fh_ret, sizeof *fh_ret);
fh_ret->fh_dev = fh->fh_dev;
fh_ret->fh_fid.lfid_fno = fd;
fh_ret->fh_fid.lfid_len =
sizeof fh_ret->fh_fid - sizeof fh_ret->fh_fid.lfid_len;
return 0;
}
return ENOENT;
}
/*
* int
* iso_read(fhandle_t *fh, int offset, int count, char *data,
* unsigned int *amountRead)
*
* Description:
* Read count bytes from file fh into buffer data
*
* Parameters:
* fh file handle of file from which to read
* offset offset into file to start reading
* count number of bytes to read
* data buffer to read bytes into
* amountRead Amount of data actually read
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_read(fhandle_t *fh, int offset, int count, char *data,
unsigned int *amountRead)
{
int error;
long fileSize;
dir_t *dirp;
multi_xtnt_t *mep;
CD_FILE f;
ISODBG(fprintf(stderr, ">>>>iso: iso_read(fd/%d, offset/%d, count/%d)\n",
fh->fh_fno, offset, count));
/*
* We use the privately "cached" directory entry because NFS reads
* files in 8K chunks; if we're reading a large file sequentially,
* we don't want to waste time re-reading the directory entry each time.
*/
error = read_dir_entry_cached(fh->fh_fno, &dirp, &mep);
if (error)
return error;
/*
* Figure out where the end of the file is, and adjust count
* accordingly.
*
* If this is a Multi-Extent file, and we found the extent
* list information collected by lookup, use it.
*/
if (mep)
fileSize = mep->me_length;
else
fileSize = CHARSTOLONG(dirp->data_len_msb);
if (offset >= fileSize) {
*amountRead = 0;
return 0;
}
DIRTOFILE(dirp, &f);
count = MIN(count, fileSize - offset);
/*
* If this is a Multi-Extent file, and we found the extent
* list information collected by lookup, use it to cycle
* through the extents to find the right ones.
*/
if (mep) {
int rem_count;
int now_count;
int now_offset;
int xtnt_num = 0;
char *buf;
one_xtnt_t *oep;
buf = data;
rem_count = count;
*amountRead = 0;
oep = mep->me_xtnts_head;
while (oep && rem_count) {
long xtnt_strt;
long xtnt_end;
xtnt_strt = oep->oe_start_byte;
xtnt_end = xtnt_strt + oep->oe_length;
if (offset >= xtnt_strt && offset < xtnt_end) {
now_count = MIN(rem_count, xtnt_end - offset);
f.block = oep->oe_start_blk;
now_offset = offset - oep->oe_start_byte;
ISODBG(fprintf(stderr,
">>>>iso: iso_read(%d) MULTI:%d offset/%d noff/%d cnt/%d blk/%d\n",
fh->fh_fno, xtnt_num,
offset, now_offset,
now_count, f.block));
error = cd_read_file(cd, &f, now_offset, now_count, buf);
if (error)
return error;
rem_count -= now_count;
offset += now_count;
buf += now_count;
*amountRead += now_count;
}
oep = oep->oe_next;
xtnt_num++;
}
} else {
/*
* Single extent logic.
*/
error = cd_read_file(cd, &f, offset, count, data);
if (! error)
*amountRead = count;
}
return error;
}
/*
* int
* iso_readdir(fhandle_t *fh, entry *entries, int count, int cookie,
* bool_t *eof, int *nread)
*
* Description:
* Read up to count byes worth of directory entries from the directory
* described by fd
*
* Parameters:
* fh file handle of directory whose entries we want
* entries Buffer to receive entries
* count Maximum # of bytes to read into entries
* cookie offset into directory entry from which to start
* eof set to 1 if we've read the last entrie
* nread set to the number of entries read
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_readdir(fhandle_t *fh, entry *entries, int count, int cookie,
bool_t *eof, int *nread)
{
int blksize;
int error, fileid, len, dirfd, newfd;
int free_dirp = 0;
char *uname;
dir_t *dirp, *contents, *dp, *newdirp;
entry *lastentry = 0, *entrybase = entries;
/* REFERENCED */
multi_xtnt_t *mep;
EXT ext;
ISODBG(fprintf(stderr, ">>>>iso: iso_readdir(%d, %d) == \n", fh->fh_fno,
cookie));
*nread = 0;
blksize = cd_get_blksize(cd);
dirfd = fh->fh_fno;
/*
* We use the privately "cached" directory entry because there's a
* high probability that this same file handle was just the subject
* of a "get_attr", which followed a lookup and we don't want to waste
* time re-reading the directory entry if we don't need to.
*/
error = read_dir_entry_cached(dirfd, &dirp, &mep);
if (error)
return error;
if (hasExt && useExt) {
ext_parse_extensions(dirp, dirfd, &ext);
error = ext_get_relo_dir(&ext, dirp, dirfd, &newdirp, &newfd);
if (error)
return error;
if (dirp != newdirp) {
dirp = newdirp;
dirfd = newfd;
free_dirp = 1;
}
}
error = read_dir(dirp, dirfd, &contents, &len);
if (error) {
if (free_dirp)
free(dirp);
return error;
}
/*
* We won't even try if there isn't at least a self and parent
* reference.
*/
if (len < 2 * sizeof *dp) {
if (free_dirp)
free(dirp);
free(contents);
return EIO;
}
/*
* We do this to clue the nfs_server module into the fact that there
* are no entries left to be read. It turns out that the NFS client
* won't listen to us when we set *eof == 0; the nfs_server module
* has to actually return a NULL entry pointer in order to convince
* the client that there are no more entries.
*/
if (cookie >= len - dirp->xattr_len) {
if (free_dirp)
free(dirp);
free(contents);
return 0;
}
/*
* Take care of self and parent entries
*/
dp = first_dir(dirp, contents, len, cookie, blksize);
if (dp == NULL) {
if (free_dirp)
free(dirp);
return EIO;
}
if (cookie == 0) {
(*nread)++;
add_entry(entries, fh->fh_fno, dot, strlen (dot),
((char *)dp) - ((char *)contents) + dp->len_dir);
lastentry = entries;
entries = entries->nextentry;
dp = next_dir(dirp, dp, contents, len, blksize);
if (dp == NULL) {
if (free_dirp)
free(dirp);
return EIO;
}
}
if (cookie < 2 * sizeof (dir_t)) {
(*nread)++;
error = get_parent_fd(fh->fh_fno, &fileid);
if (error) {
if (free_dirp)
free(dirp);
free(contents);
return error;
}
add_entry(entries, fileid, dotdot, strlen (dotdot),
((char *)dp) - ((char *)contents) + dp->len_dir);
lastentry = entries;
entries = entries->nextentry;
dp = next_dir(dirp, dp, contents, len, blksize);
}
/*
* Now do the rest
*/
while (dp && (char *)entries - (char *)entrybase
+ sizeof (entry) + NFS_MAXNAMLEN + 1 < count) {
/*
* Skip associated files
* & all but the first multi-extent directory entry.
*/
if ( ! (dp->flags & (FFLAG_ASSOC) )) {
fileid = MKFD(dirp, contents, dp, blksize);
if (useExt && hasExt) {
ext_parse_extensions(dp, fileid, &ext);
if (ext.isRelocated) {
/*
* Banking on the fact here that we don't have multi-extent
* files that are relocated. This seems a safe assumption
* since relocation seems to be a property of directories
* which we know can only be a single extent.
* (ISO 9660 6.8.1)
*/
dp = next_dir(dirp, dp, contents, len, blksize);
continue;
}
/*
* If the directory is really mapped to another location,
* return the fileid (viewed as the inode number on the outside
* world) of the new location to the NFS layer. Otherwise, it
* doesn't look like the new directory is a child of the parent.
* getcwd() does indeed ensure that the current directory is
* a child of the parent, which isn't the case unless you return
* the new inode number.
*/
if (ext.child) {
fileid = ext.child * blksize;
}
uname = ext.gotName ? ext.name
: to_unixname(dp->file_id, dp->len_fi);
} else {
uname = to_unixname(dp->file_id, dp->len_fi);
}
(*nread)++;
add_entry(entries,
fileid,
uname,
strlen (uname),
((char *)dp) - ((char *)contents) + dp->len_dir);
ISODBG(fprintf(stderr,
">>>>iso: iso_readdir add_entry MULTI=%d(%d): %s\n",
(dp->flags & FFLAG_MULTI) ? 1 : 0,
fileid, uname));
lastentry = entries;
entries = entries->nextentry;
/*
* Is this the 1st of a series of directory entries
* for a multi-extent file?
*/
if (dp->flags & FFLAG_MULTI) {
/*
* Skip all the entries with FFLAG_MULTI, and the next
* one where it's not set (last entry of a series).
*/
do {
dp = next_dir(dirp, dp, contents, len, blksize);
/*
* Update the "cookie" field in the last entry
* to reflect that we've skipped an entry.
*/
if (dp)
*(int *)lastentry->cookie = ((char *)dp)
- ((char *)contents)
+ dp->len_dir;
} while (dp && (dp->flags & FFLAG_MULTI));
if (dp == NULL)
break;
}
}
dp = next_dir(dirp, dp, contents, len, blksize);
}
*eof = ! dp
|| ! dp->len_dir
|| ((char *)dp - (char *)contents) + dp->len_dir >= len;
if (lastentry)
lastentry->nextentry = 0;
ISODBG(fprintf(stderr, ">>>>iso: iso_readdir: eof = %d\n", *eof));
if (free_dirp)
free(dirp);
free(contents);
return 0;
}
/*
* int
* iso_readraw(unsigned long block, void *buf, unsigned long count)
*
* Description:
* Read raw data from the CD. This is here for debugging support
* for the testcd test program.
*
* Parameters:
* block block on the CD to read from
* buf memory to read into
* count number of bytes to read
*
* Returns:
* 0 if successful, error code if error
*/
int
iso_readraw(unsigned long offset, void *buf, unsigned long count)
{
/*
* If the test program is trying to read the volume descriptor,
* the block number will be 16, and we should use CDROM_BLKSIZE.
* Otherwise, it's asking for data, and we should use the
* block size we got from the volume descriptor.
*/
return cd_read(cd, offset == 16 ? 16 * CDROM_BLKSIZE :
offset * cd_get_blksize(cd), buf, count, 0,
"iso_readraw", __LINE__);
}
/*
* void
* iso_disable_name_translations(char)
*
* Description:
* Modify the way we muck with the filenames on the CD.
* 'c' == No translation, this results in very ugly file names in
* all caps, sometimes ending with a semi-colon and then a
* version number.
* 'l' == Translate to lower case.
* 'm' == Suppress the version #.
* 'x' == (Default) Translate to lower case & suppress the version #.
*/
void
iso_disable_name_translations(char xchar)
{
notranslate = xchar;
}
void
iso_disable_extensions(void)
{
useExt = 0;
}
/*
* void
* iso_setx(void)
*
* Description:
* Make it so we automatically set execute permission on every
* file. This speeds up attribute checking and enables execution
* of files that our algorithm may not give execute permission to.
*/
void
iso_setx(void)
{
setx = 1;
}
/*
* int
* iso_getfs(char *path, fhandle_t *fh, struct svc_req *rq )
*
* Description:
* Get a file handle given its mount point. Also, if rq is
* non-NULL, perform check to see if path should be exported to
* the requestor represented by rq.
*
* Parameters:
* path Mount point in which we're interested
* fh receives file handle
* rq NFS service request
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_getfs(char *path, fhandle_t *fh, struct svc_req *rq)
{
FILE *fp;
struct exportent *xent;
int error;
struct sockaddr_in *sin;
struct hostent *hp;
char *access, **aliases, *host;
/*
* Make sure they're asking about the file system that we've got
* mounted.
*/
if (strcmp(path, mountPoint) != 0) {
return ENOENT;
}
/*
* Check to see if letting the requestor see this file system is
* allowed (someone must run exportfs(1M).
*
* Note: this code is derived from code found in cmd/sun/rpc.mountd.c
*/
fp = setexportent();
if (!fp) {
return EACCES;
}
error = EACCES;
while (error && (xent = getexportent(fp))) {
if (strcmp(path, xent->xent_dirname) == 0) {
sin = svc_getcaller(rq->rq_xprt);
hp = gethostbyaddr(&sin->sin_addr, sizeof sin->sin_addr,
AF_INET);
/*
* Derived from cmd/sun/rpc.mountd.c
*/
access = getexportopt(xent, ACCESS_OPT);
if (!access) {
error = 0;
} else {
while ((host = strtok(access, ":")) != NULL) {
access = NULL;
if (strcasecmp(host, hp->h_name) == 0
|| innetgr(host, hp->h_name, NULL, _yp_domain))
error = 0;
else
for (aliases = hp->h_aliases; *aliases && error;
aliases++)
if (strcasecmp(host, *aliases) == 0
|| innetgr(access, *aliases, NULL,
_yp_domain))
error = 0;
}
}
if (error) {
access = getexportopt(xent, ROOT_OPT);
}
if (access) {
while ((host = strtok(access, ":")) != NULL) {
access = NULL;
if (strcasecmp(host, hp->h_name) == 0)
error = 0;
}
}
if (error) {
access = getexportopt(xent, RW_OPT);
}
if (access) {
while ((host = strtok(access, ":")) != NULL) {
access = NULL;
if (strcasecmp(host, hp->h_name) == 0)
error = 0;
}
}
}
}
endexportent(fp);
if (!error) {
bcopy(&rootfh, fh, sizeof *fh);
}
return error;
}
/*
* int
* iso_getblksize(void)
*
* Description:
* Get the CD block size for the nfs_server module (which does
* not have access to the cd pointer)
*
* Returns:
* block size of our file system
*/
int
iso_getblksize(void)
{
return cd_get_blksize(cd);
}
/*
* int
* iso_getattr(fhandlet_t *fh, fattr *fa)
*
* Description:
* Fill in fa with the attributes of fh
*
* Parameters:
* fh file handle whose attributes we want
* fa Buffer to receive attributes
*
* Returns:
* 0 if successful, error code otherwise
*/
int
iso_getattr(fhandle_t *fh, fattr *fa)
{
int error, blksize;
int gotTimes = 0, gotMode = 0, newfd, fileid;
int free_dirp = 0;
dir_t *dirp, *newDirp;
hsxattr_t *hsxattr;
/* REFERENCED */
multi_xtnt_t *mep;
xattr_t xattr;
EXT ext;
ISODBG(fprintf(stderr, ">>>>iso: iso_getattr(%d)\n", fh->fh_fno));
fileid = fh->fh_fno;
/*
* We use the privately "cached" directory entry because there's a
* high probability that this same file handle was just the subject
* of a lookup and we don't want to waste time re-reading the directory
* entry if we don't need to.
*/
error = read_dir_entry_cached(fileid, &dirp, &mep);
if (error)
return error;
if (hasExt && useExt) {
ext_parse_extensions(dirp, fileid, &ext);
error = ext_get_relo_dir(&ext, dirp, fileid, &newDirp, &newfd);
if (error)
return error;
if (newDirp != dirp) {
dirp = newDirp;
fileid = newfd;
free_dirp = 1;
ext_parse_extensions(dirp, fileid, &ext);
}
gotMode = ext.gotMode;
if (ext.gotMode) {
fa->mode = ext.mode;
fa->nlink = ext.nlink;
fa->uid = ext.uid;
fa->gid = ext.gid;
fa->type = ext.type;
}
fa->rdev = ext.rdev;
gotTimes = ext.gotATime + ext.gotMTime + ext.gotCTime;
/*
* Take care of the situation in which only one or two of create,
* modify, and access were available. Set the missing one(s)
* according to the following order of preference: create, modify,
* access.
*/
if (0 < gotTimes && gotTimes < 3) {
if (ext.gotCTime) {
if (!ext.gotMTime) {
ext.mtime = ext.ctime;
}
if (!ext.gotATime) {
ext.atime = ext.ctime;
}
} else if (!ext.gotMTime) {
if (!ext.gotCTime) {
ext.ctime = ext.mtime;
}
if (!ext.gotATime) {
ext.atime = ext.mtime;
}
} else {
if (!ext.gotCTime) {
ext.ctime = ext.atime;
}
if (!ext.gotMTime) {
ext.mtime = ext.atime;
}
}
}
if (gotTimes) {
fa->atime = ext.atime;
fa->mtime = ext.mtime;
fa->ctime = ext.ctime;
}
}
/*
* These attributes are the same no matter what, but they can't be
* set until after we've read the relocated directory.
*/
fa->blocksize = blksize = cd_get_blksize(cd);
fa->fsid = fh->fh_dev;
fa->fileid = fh->fh_fno;
/*
* If this is a Multi-Extent file, use the extent
* list information collected by lookup.
*/
if (mep)
fa->size = mep->me_length;
else
fa->size = CHARSTOLONG(dirp->data_len_msb);
fa->blocks = (fa->size + blksize - 1) / blksize;
/*
* Now fall back on the extended attributes if we didn't find what
* we wanted in the Rock Ridge extensions. If there are no
* extended attributes, we'll do the best we can with the info in
* the directory entry and some good guesses.
*
* If there's an extended attribute record for this file,
* we'll use it. Otherwise, we'll use mode PERM_RXALL and
* use the recording date for all dates.
*/
if (! gotMode) {
fa->nlink = 1;
fa->type = (FLAGS(dirp) & FFLAG_DIRECTORY) ? NFDIR : NFREG;
if (dirp->xattr_len) {
ISODBG(fprintf(stderr, ">>>>iso: iso_getattr: fh has xattr's\n"));
error = cd_read(cd, CHARSTOLONG(dirp->ext_loc_msb) *
blksize, &xattr, sizeof xattr, useCache,
"iso_getattr", __LINE__);
hsxattr = (hsxattr_t *)&xattr;
if (error) {
if (free_dirp)
free(dirp);
return error;
}
ISODBG(fprintf(stderr, ">>>>iso: iso_getattr: perm = 0x%x\n",
xattr.perm));
fa->mode = ((fa->type == NFDIR) ? S_IFDIR : 0) |
((~xattr.perm & PERM_OREAD) ? S_IRUSR : 0) |
((~xattr.perm & PERM_OEXE) ? S_IXUSR : 0) |
((~xattr.perm & PERM_GREAD) ? S_IRGRP : 0) |
((~xattr.perm & PERM_GEXE) ? S_IXGRP : 0) |
((~xattr.perm & PERM_WREAD) ? S_IROTH : 0) |
((~xattr.perm & PERM_WEXE) ? S_IXOTH : 0);
fa->uid = xattr.owner_id;
fa->gid = xattr.group_id;
} else {
fa->uid = 0;
fa->gid = 0;
if (fa->type == NFDIR)
fa->mode = S_IFDIR | PERM_RXALL;
else if (setx)
fa->mode = PERM_RXALL;
else {
char buf[CDROM_BLKSIZE];
struct filehdr *file;
struct exec *e;
Elf32_Ehdr *elf;
ISODBG(fprintf(stderr,
">>>>iso: iso_getattr: non-xattr case ext_loc_msb/%d xattr_len/%d size/%d\n",
CHARSTOLONG(dirp->ext_loc_msb),
dirp->xattr_len, fa->size));
/*
* Figure out what permissons to give the file.
*
* Always set read permission for all.
*
* Never set write permission.
*
* Set execute permissions on COFF files (we may be
* exporting this to other systems), SUN executables,
* ELF executables, or shell scripts.
*/
fa->mode = PERM_RALL;
/*
* Don't try to "sniff" zero-length files,
* ext_loc_msb may take us out into the "weeds".
*/
if (fa->blocks) {
error = cd_read(cd,
CHARSTOLONG(dirp->ext_loc_msb) * blksize +
dirp->xattr_len, buf, sizeof buf, useCache,
"iso_getattr", __LINE__);
if (error) {
if (free_dirp)
free(dirp);
return error;
}
file = (struct filehdr *)buf;
e = (struct exec *)buf;
elf = (Elf32_Ehdr *)buf;
if ((ISCOFF(file->f_magic) && file->f_flags & F_EXEC)
|| !N_BADMAG(*e)
|| IS_ELF(*elf)
|| (buf[0] == '#' && buf[1] == '!'))
fa->mode |= PERM_XALL;
}
}
}
}
if (gotTimes == 0) {
if (dirp->xattr_len) {
convert_time(&fa->atime, fsType == ISO ? &xattr.modify :
(struct date_time *)&hsxattr->modify, fsType);
convert_time(&fa->mtime, fsType == ISO ? &xattr.modify :
(struct date_time *)&hsxattr->modify, fsType);
convert_time(&fa->ctime, fsType == ISO ? &xattr.create :
(struct date_time *)&hsxattr->create, fsType);
} else {
fa->atime.seconds =
convert_to_seconds(dirp->recording.year +1900,
dirp->recording.month, dirp->recording.day,
dirp->recording.hour,
dirp->recording.minute,
dirp->recording.second, 0,
fsType == ISO ?
dirp->recording.greenwich : 0);
fa->atime.useconds = 0;
fa->mtime = fa->ctime = fa->atime;
}
}
if (free_dirp)
free(dirp);
return 0;
}
/*
* int
* iso_readlink(fhandle_t *fh, char **link)
*
* Description:
* Get the value of a symbolic link from the Rock Ridge
* extensions.
*
* Parameters:
* fh File handle to get link for
* link Gets link value
*
* Returns:
* 0 if successful, errno otherwise.
*/
int
iso_readlink(fhandle_t *fh, char **link)
{
static EXT ext;
int error;
dir_t *dirp;
/* REFERENCED */
multi_xtnt_t *mep;
if (!useExt || !hasExt)
return ENXIO;
/*
* We use the privately "cached" directory entry because there's a
* high probability that this same file handle was just the subject
* of a lookup and we don't want to waste time re-reading the directory
* entry if we don't need to.
*/
error = read_dir_entry_cached(fh->fh_fno, &dirp, &mep);
if (error)
return error;
ext_parse_extensions(dirp, fh->fh_fno, &ext);
if (!ext.gotPath)
return ENXIO;
*link = ext.path;
return 0;
}
void
dump_block(char *cp, int sz)
{
int i;
for (i = 0; i < sz; i++) {
if (! (i % 16))
fprintf(stderr, "\n>>>>iso: ");
if (isprint(cp[i]))
fprintf(stderr, " %c", cp[i]);
else if (iscntrl(cp[i]))
fprintf(stderr, " \\%c", cp[i] | ' ');
else
fprintf(stderr, " %3o", cp[i]);
}
fprintf(stderr, "\n");
}
/*
* static int
* set_blocks()
*
* Description:
* Set the number of blocks in the generic file system. This gets
* called at startup, and also every time a change in media is detected.
*
* Returns:
* 0 if successful, error code otherwise
*/
static int
set_blocks()
{
int error;
struct p_vol_desc vol;
hsvol_t *hsvol;
int blksize;
error = cd_read(cd, cd_voldesc(cd), &vol, sizeof vol, 0,
"set_blocks", __LINE__);
if (error)
return error;
hsvol = (hsvol_t *)&vol;
if (strncmp(vol.id, "CD001", 5) == 0)
fsType = ISO;
else if (strncmp((const char *)hsvol->ident, "CDROM", 5) == 0)
fsType = HSFS;
else {
ISODBG(fprintf(stderr, ">>>>iso: Disc is Unknown format\n"));
ISODBG(dump_block((char *)&vol, sizeof vol));
return EIO;
}
ISODBG(fprintf(stderr, ">>>>iso: Disc is in %s format\n",
(fsType == ISO) ? "ISO 9660" : "High Sierra"));
fsBlocks = (fsType == ISO) ? vol.vol_space_size_msb
: CHARSTOLONG(hsvol->vol_space_size_msb);
rootfh.fh_fid.lfid_len = sizeof rootfh.fh_fid
- sizeof rootfh.fh_fid.lfid_len;
blksize = (fsType == ISO) ? vol.blksize_msb
: CHARSTOSHORT(hsvol->blksize_msb);
rootfh.fh_fno
= (fsType == ISO ?
(CHARSTOLONG(vol.root.ext_loc_msb) + vol.root.xattr_len)
: (CHARSTOLONG(hsvol->root.ext_loc_msb) + hsvol->root.xattr_len))
* blksize;
error = cd_set_blksize(cd, blksize);
if (error) {
return error;
}
if (fsType == ISO) {
check_for_extensions();
}
return 0;
}
/*
* static int
* get_parent_fd(int dir, int *fdp)
*
* Description:
* Get the file descriptor of this directory's parent
*
* Parameters:
* dir File descriptor of directory we want parent of
* fdp receives file descriptor of parent
*
* Returns:
* 0 if successful, error code otherwise
*/
static int
get_parent_fd(int dir, int *fdp)
{
dir_t *this_dir, *this_contents, *parent;
int error, blksize, len;
int parent_block;
blksize = cd_get_blksize(cd);
error = read_dir_entry(dir, &this_dir);
if (error)
return error;
error = read_dir(this_dir, dir, &this_contents, &len);
if (error) {
free(this_dir);
return error;
}
parent = (dir_t *)((char *)this_contents + this_contents->len_dir);
parent_block = CHARSTOLONG(parent->ext_loc_msb) + parent->xattr_len;
if (hasExt && useExt) {
EXT ext_info;
int parent_fd;
parent_fd = MKFD(this_dir, this_contents, parent, blksize);
ext_parse_extensions(parent, parent_fd, &ext_info);
if (ext_info.parent) {
parent_block = ext_info.parent;
}
}
*fdp = parent_block * blksize;
free(this_dir);
free(this_contents);
return 0;
}
/*
* static void
* add_entry(entry *entries, int fd, char *name, int name_len, int cookie)
*
* Description:
* Helper function for iso_readdir(). Puts fd and name into an entry,
* and sets entries->nextentry to point to the place for the next
* entry.
*
* Parameters:
* entries buffer for entries
* fd file descriptor to add to entries
* name name of file to add to entries
* name_len lengthe of name
* cookie cookie for next entry
*/
static void
add_entry(entry *entries, int fd, char *name, int name_len, int cookie)
{
char *ptr;
entries->fileid = fd;
/*
* We copy the name to the memory immediately following this entry.
* We'll set entries->nextentry to the first byte afterwards that we
* can use, taking alignment into consideration.
*/
entries->name = (char *)(entries + 1);
strncpy(entries->name, name, name_len);
entries->name[name_len] = '\0';
*(int *)entries->cookie = cookie;
entries->nextentry = (entry *)((char *)(entries + 1) + name_len + 1);
ptr = (char *)entries->nextentry;
/*
* Fix alignment problems
*/
if ((int)ptr % 4) {
ptr = ptr + 4 - ((int)ptr % 4);
entries->nextentry = (entry *)ptr;
}
}
/*
* static int
* read_dir(dir_t *dirp, int dirfd, dir_t **datap, int *len)
*
* Description:
* Read a directory into memory
*
* Parameters:
* dirp pointer to directory structure of the directory we want to read
* dirfd fd of dirp
* datap Make this point to the directory's contents
* len Make this point to the length of the directory
*
* Returns:
* 0 if successful, error code otherwise
*/
static int
read_dir(dir_t *dirp, int dirfd, dir_t **datap, int *len)
{
dir_t *dp_ret, *newdirp;
int loc, error, blksize, toRead, newfd;
EXT ext;
void *toFree = 0;
blksize = cd_get_blksize(cd);
if (hasExt && useExt) {
ext_parse_extensions(dirp, dirfd, &ext);
/*
* If dirp points to a relocated directory or the parent of a
* relocated directory, then use the child/parent pointer in
* the extensions rather than the ISO pointer. What we do is
* then replace dirp with the appropriate self-referential
* directory entry (the self-referential dir entry is always
* the first on in the directory, and we're assuming that it's
* never relocated).
*/
if ((error = ext_get_relo_dir(&ext, dirp, dirfd,
&newdirp, &newfd)) != 0) {
return error;
}
if (newdirp != dirp) {
/*
* Set this up to be freed later so we don't leak.
*/
toFree = dirp = newdirp;
}
}
if (!(FLAGS(dirp) & FFLAG_DIRECTORY))
return ENOTDIR;
loc = (CHARSTOLONG(dirp->ext_loc_msb) + dirp->xattr_len) * blksize;
*len = CHARSTOLONG(dirp->data_len_msb);
if (toFree) {
free(toFree);
}
dp_ret = safe_malloc(*len);
error = cd_read(cd, loc, dp_ret, *len, useCache, "read_dir", __LINE__);
if (error) {
free(dp_ret);
return error;
}
*datap = dp_ret;
return 0;
}
/*
* static int
* read_dir_entry_cached(int fd, dir_t **dpp, multi_xtnt_t **mpp)
*
* Description:
* Read the directory entry for the file descriptor fd into memory
* if we don't already have it there. Keep it there until a request
* for a different arrives. If it's already there, skip the read.
*
* Parameters:
* fd file descriptor of directory to read entry of
* dpp make this point to the directory entry
* mep make this point to the multi extent entry, if it exists
*
* Returns:
* 0 if successful, error code otherwise
*/
static int
read_dir_entry_cached(int fd, dir_t **dpp, multi_xtnt_t **mpp)
{
int error;
if (!useCache || fd != dirc_last_fd || !dirc_dirp) {
if (dirc_dirp) {
free(dirc_dirp);
dirc_mep = NULL;
dirc_dirp = NULL;
dirc_last_fd = -1;
}
error = read_dir_entry(fd, &dirc_dirp);
if (error)
return error;
dirc_last_fd = fd;
/*
* If this is a Multi-Extent file, find the extent
* list information collected by lookup.
*/
if (dirc_dirp->flags & FFLAG_MULTI) {
dirc_mep = iso_me_search(fd);
ISODBG(fprintf(stderr,
">>>>iso: read_dir_entry_cached: me_search for %d = 0x%x\n",
fd, dirc_mep));
}
dirc_miss++;
} else {
dirc_hit++;
}
*dpp = dirc_dirp;
*mpp = dirc_mep;
return 0;
}
/*
* static int
* read_dir_entry(int fd, dir_t **dpp)
*
* Description:
* Read the directory entry for the file descriptor fd into memory
*
* Parameters:
* fd file descriptor of directory to read entry of
* dpp make this point to the directory entry
*
* Returns:
* 0 if successful, error code otherwise
*/
static int
read_dir_entry(int fd, dir_t **dpp)
{
dir_t *dirp;
int error, changed, blksize;
/*
* Here we check to see if the user has ejected the disc and inserted
* another. This is not fatal for us for the reason that the root
* file handle of any ISO 9660 file system is the same the way
* we've defined it. The user is thus free to switch CD's at
* will; the only complications will be to processes that have
* the CD as their current directoriess.
*/
error = cd_media_changed(cd, &changed);
if (error)
return error;
if (changed) {
cd_flush_cache(cd);
iso_me_flush();
error = set_blocks();
if (error)
return error;
}
/*
* Read one block's worth of data. We don't know how big a
* directory entry will be without reading it first, and since we
* might be using the system use area we can't even guess, except
* that we do know that directory entries can't span blocks. So
* we just read a block.
*
* Should just read the block that dir entry is in, but then dirp
* won't point to the beginning of malloced memory so caller can't
* free it.
*/
blksize = cd_get_blksize(cd);
dirp = safe_malloc(blksize);
error = cd_read(cd, fd, dirp, blksize, useCache, "read_dir_entry", __LINE__);
if (error) {
free (dirp);
return error;
}
/*
* Make sure that the data read in makes sense when interpreted
* as a directory entry
*/
if (dirp->len_dir < sizeof (dir_t) ||
dirp->len_fi > dirp->len_dir - sizeof (dir_t) + 1) {
free (dirp);
return ENOTDIR;
}
/*
* I've seen discs that don't have the directory bit set in
* the root directory. So we'll set it if it isn't.
*/
if ((fd == ROOT_DIR() || fd == HS_ROOT_DIR())
&& !(dirp->flags & FFLAG_DIRECTORY)) {
dirp->flags |= FFLAG_DIRECTORY;
#ifdef WEIRD_DMA_DISC
/*
* The Defense Mapping Agency put out a number of bogus
* discs, with 0 in the length field of the root directory.
* Apparently, they ship special drivers so these discs can
* be read on PC's. It seems that enough of our customers
* have these discs that including this stuff is warranted;
* as of 02/13/92 the Makefile defined WEIRD_DMA_DISC so
* that this code would go in.
*/
if (CHARSTOLONG(dirp->data_len_msb) == 0) {
dirp->data_len_msb[3] = (char)CDROM_BLKSIZE & 0xff;
dirp->data_len_msb[2] = (char)(CDROM_BLKSIZE >> 8) & 0xff;
dirp->data_len_msb[1] = (char)(CDROM_BLKSIZE >> 16) & 0xff;
dirp->data_len_msb[0] = (char)(CDROM_BLKSIZE >> 24) & 0xff;
}
#endif
}
*dpp = dirp;
return 0;
}
/*
* static void
* convert_time(struct nfstime *to, struct date_time *from)
*
* Description:
* Convert from a date_time struct to an nfs time struct. This involves
* converting from (year, month, day, hour, minute, second) to
* (seconds since 1/1/1970)
*
* Parameters:
* to the nfs version
* from the ISO 9660 version
*/
static void
convert_time(struct nfstime *to, struct date_time *from, enum cdtype type)
{
#define TWODECDIGITSTOINT(dd) ((dd[1] - '0') + (dd[0] - '0') * 10)
int year, month, day, min, hour, sec, csec;
csec = TWODECDIGITSTOINT(from->centiseconds);
to->useconds = csec * 10;
year = (from->year[3] - '0') + 10 * (from->year[2] - '0')
+ 100 * (from->year[1] - '0') + 1000 * (from->year[0] - '0');
month = TWODECDIGITSTOINT(from->month);
day = TWODECDIGITSTOINT(from->day);
hour = TWODECDIGITSTOINT(from->hour);
min = TWODECDIGITSTOINT(from->minute);
sec = TWODECDIGITSTOINT(from->second);
to->seconds = convert_to_seconds(year, month, day, hour, min, sec,
csec, type == ISO ? from->greenwich : 0);
#undef TWODECDIGITSTOINT
}
/*
* static int
* convert_to_seconds(int year, int month, int day, int hour,
* int min, int sec, int csec, int gw)
*
* Description:
* Turn (year, month, day, hour, minute, second) into the number of
* seconds since 1/1/1970
*
* Parameters:
* year
* month
* day
* hour
* min
* sec
* csec hundredths of a second (ignored)
* gw offset from greenwich time in # of 15 minute intervals
*
* Returns:
* The number of seconds since 1970 of (year, month...)
*/
static int
convert_to_seconds(int year, int month, int day, int hour,
int min, int sec, int csec, int gw)
{
if (year < 1970)
year = 1970;
if (1 > month || 12 < month)
month = 1;
if (!valid_day(day, month, year))
day = 1;
if (hour < 0 || hour > 23)
hour = 0;
if (min < 0 || min > 59)
min = 0;
if (sec < 0 || sec > 59)
sec = 0;
return (((((((year - 1970) * 365 + ((year - 1969) / 4) +
days_so_far(day, month, year)) * 24) + hour) * 60) +
min - gw * 15) * 60 + sec);
}
/*
* static int
* valid_day(int day, int month, int year)
*
* Description:
* Determine if there is, was, or will be a date month/day/year
*
* Parameters:
* day
* month
* year
*
* Returns:
* 1 if this is a valid date, 0 if not
*/
static int
valid_day(int day, int month, int year)
{
static int days[12] =
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
/*
* Special case February in a leap year
*/
if (IS_LEAPYEAR(year) == 0 && month == 2)
if (day >= 1 && day <= 29)
return 1;
if (day < 1 || day > days[month - 1])
return 0;
return 1;
}
/*
* static int
* days_so_far(int day, int month, int year)
*
* Description:
* Figure out how may days have gone by in the year as of month/day
*
* Parameters:
* day
* month
* year
*
* Returns:
* The number of days so far
*/
static int
days_so_far(int day, int month, int year)
{
static int days[12] =
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
return day - 1 + days[month - 1] +
(IS_LEAPYEAR(year) && month > 2 ? 1 : 0);
}
/*
* static char *
* to_unixname(char *name, int length)
*
* Description:
* Convert an ISO 9660 name to a UNIX name. We convert to all lower case
* letters, and blow away any fluff of the form ";#".
*
* Parameters:
* name
* length
*
* Returns:
* The unix name. Note: this is static, will be overwritten next
* this function is called
*/
static char *
to_unixname(char *name, int length)
{
#define min(a,b) ((a) < (b) ? (a) : (b))
#define tolower(c) (isupper(c) ? _tolower(c) : (c))
static char uname[NFS_MAXNAMLEN];
int i;
char *dotp;
length = min(sizeof uname - 1, length);
if (*name == '\0')
return dot;
if (*name == '\1')
return dotdot;
/*
* Check for "no translation at all"
*/
if (notranslate == 'c') {
bcopy(name, uname, length);
uname[length] = '\0';
return uname;
}
/*
* 1st check for the "fast" default mode name translation.
* This behaves as if both 'l' & 'm' modes were in effect.
*/
if (notranslate == 'x') {
for (i = 0; i < length; i++) {
if (name[i] == ';')
break;
uname[i] = tolower(name[i]);
}
} else {
for (i = 0; i < length; i++) {
/*
* Check to see if we're to "lop off" the version #.
*/
if (notranslate == 'm') {
if (name[i] == ';')
break;
else
uname[i] = name[i];
}
/*
* Check to see if we're to change to lower case.
*/
if (notranslate == 'l')
uname[i] = tolower(name[i]);
}
}
uname[i] = '\0';
/*
* Custom dictates that if the translated 8.3
* name ends in just a ".", we can trim it off.
*/
dotp = strrchr(uname, '.');
if (dotp && *(dotp + 1) == '\0')
*dotp = '\0';
return uname;
#undef min
#undef tolower
}
/*
* Rock Ridge extensions
*/
#define EXT_VERSION 1
#define MKSYSUSE(byte1,byte2) ((byte1) | ((byte2) << 8))
#define EXT_CONT MKSYSUSE('C', 'E')
#define EXT_PAD MKSYSUSE('P', 'D')
#define EXT_SYSUSE MKSYSUSE('S', 'P')
#define EXT_TERM MKSYSUSE('S', 'T')
#define EXT_EXT MKSYSUSE('E', 'R')
#define EXT_MODE MKSYSUSE('P', 'X')
#define EXT_DEVNODE MKSYSUSE('P', 'N')
#define EXT_SYMLINK MKSYSUSE('S', 'L')
#define EXT_NAME MKSYSUSE('N', 'M')
#define EXT_CHILD MKSYSUSE('C', 'L')
#define EXT_PARENT MKSYSUSE('P', 'L')
#define EXT_RELO MKSYSUSE('R', 'E')
#define EXT_TIME MKSYSUSE('T', 'F')
#define EXT_FLAGS MKSYSUSE('R', 'R')
/*
* Flags for NM and SL fields
*/
#define NM_CONT 1
#define NM_CUR 2
#define NM_PAR 4
#define NM_ROOT 8
#define NM_VOLROOT 0x10
#define NM_HOST 0x20
/*
* Flags for TM field
*/
#define TM_CREATE 1
#define TM_MODIFY 2
#define TM_ACCESS 4
#define TM_ATTR 8
#define TM_BACKUP 0x10
#define TM_EXPIRE 0x20
#define TM_EFFECTIVE 0x40
#define TM_LONG 0x80
/*
* Flags for the RR field
*/
#define FL_PX 1
#define FL_PN 2
#define FL_SL 4
#define FL_NM 8
#define FL_CL 0x10
#define FL_PL 0x20
#define FL_RE 0x40
#define FL_TF 0x80
/*
* This structure is used to traverse the system used fields. cur
* points to the current field, and base is the start of either the
* system use area of dirp or to contBuf, depending on whether we're
* going through the directory record or a continuation area.
*/
typedef struct tagSysUse {
dir_t *dirp; /* directory */
char *cur; /* current offset */
char *base; /* base */
int length; /* current length */
char *contBuf; /* continutation buffer */
int cont; /* continuation block */
int contLen; /* continuation length */
int contOff; /* continuation offset */
} SYSUSE;
/*
* static void
* ext_process_fields(SYSUSE *sys)
*
* Description:
* Do generic Rock Ridge extension field processing. This takes
* care of continuation, padding, and termination fields all in
* one place. sys->cur is set to NULL when there are no more
* fields to be processed.
*
* Parameters:
* sys struct to maintain state while traversing extensions.
*/
static void
ext_process_fields(SYSUSE *sys)
{
short field;
int error;
while (1) {
/*
* We check if we're at the end of this system use area.
* If there was a CE, we read it in and keep going from there;
* otherwise we set sys->cur = NULL indicating that we're done.
*/
if (sys->cur - sys->base >= sys->length || sys->cur[2] == 0) {
if (sys->cont) {
if (sys->contBuf) {
free(sys->contBuf);
}
sys->contBuf = safe_malloc(sys->contLen);
ISODBG(fprintf(stderr,
">>>>iso: Reading in a continuation!!\n"));
error = cd_read(cd, sys->cont * cd_get_blksize(cd) +
sys->contOff, sys->contBuf,
sys->contLen, useCache,
"ext_process_fields", __LINE__);
if (error) {
ISODBG(fprintf(stderr, ">>>>iso: Cont read error = %d\n",
error));
sys->cur = NULL;
return;
}
sys->base = sys->cur = sys->contBuf;
sys->length = sys->contLen;
sys->cont = 0;
} else {
sys->cur = NULL;
return;
}
}
/*
* Ignore fields that have the wrong version
*/
if (sys->cur[3] != EXT_VERSION) {
sys->cur += sys->cur[2];
continue;
}
field = MKSYSUSE(sys->cur[0], sys->cur[1]);
switch (field) {
case EXT_CONT:
ISODBG(fprintf(stderr, ">>>>iso: Got a continuation!!\n"));
/*
* When we encounter a continuation field, we stash away
* its values in our SYSUSE structure. The CE gives us
* info for finding a continuation of the system use area.
* There's only supposed to be one CE per system use area,
* so it's safe to stash it for later and keep going (it
* would be pretty braindamaged, but there could be more
* fields after the CE field).
*/
sys->cont = CHARSTOLONG(sys->cur + 8);
sys->contLen = CHARSTOLONG(sys->cur + 24);
sys->contOff = CHARSTOLONG(sys->cur + 16);
/* intentional fall-through */
case EXT_PAD:
/*
* After processing CE, or if we find PD, skip over it.
*/
ISODBG(fprintf(stderr, ">>>>iso: Skipping %c%c\n",
sys->cur[0], sys->cur[1]));
sys->cur += sys->cur[2];
break;
case EXT_TERM:
ISODBG(fprintf(stderr, ">>>>iso: Got an ST\n"));
/*
* ST tells us that this is the system use area is over.
*/
sys->cur = NULL;
return;
default:
/*
* Anything else, pass it back to the caller for deciphering.
*/
return;
}
}
}
/*
* static void
* ext_free_sys(SYSUSE *sys)
*
* Description:
* Function to be called when we're all done traversing Rock
* Ridge extension fields. This frees any memory we malloced for
* reading in continuation blocks.
*
* Parameters:
* sys struct for maintaining state while traversing extensions.
*/
static void
ext_free_sys(SYSUSE *sys)
{
if (sys->contBuf) {
free(sys->contBuf);
sys->contBuf = NULL;
}
}
/*
* static char *
* ext_first_field(dir_t *dirp, int dirfd, SYSUSE *sys)
*
* Description:
* Get the first field in the Rock Ridge extensions of a
* directory entry. The reason that we need dirfd here is to
* differentiate the '.' entry of the root directory from all
* others. If this is the '.' entry of the root directory, then
* we don't skip skipSysBytes, as per the spec. For all other
* directory entries, we do skip skipSysBytes.
*
* Parameters:
* dirp directory entry to get extensions from
* dirfd Descriptor for this directory
* sys A structure that helps us traverse extensions
*
* Returns:
* a pointer to the first Rock Ridge extension field, NULL if
* there are none.
*/
static char *
ext_first_field(dir_t *dirp, int dirfd, SYSUSE *sys)
{
char *sysUse;
bzero(sys, sizeof *sys);
sys->dirp = dirp;
sys->length = dirp->len_dir - sizeof(dir_t) - dirp->len_fi + 1;
if ((dirp->len_fi & 1) == 0) {
sys->length--;
}
if (sys->length < 2) {
return NULL;
}
/*
* skipSysBytes gets set in check_for_extensions, below.
* check_for_extensinons calls us before it ever sets this, which
* is OK because the spec says that the '.' entry of the
* root directory (which is what check_for_extensions looks at)
* does not use the skip bytes.
*/
sys->cur = sys->base = (char *)dirp + dirp->len_dir - sys->length
+ (dirfd != rootSelfEntry ? skipSysBytes : 0);
ext_process_fields(sys);
return sys->cur;
}
/*
* static char *
* ext_next_field(SYSUSE *sys)
*
* Description:
* Get the next field from the Rock Ridge extensions
*
* Parameters:
* sys parameter that keeps state around about rock ridge
* extensions
*
* Returns:
* Pointer to the next field in the extensions, NULL if there are
* none left.
*/
static char *
ext_next_field(SYSUSE *sys)
{
sys->cur += sys->cur[2];
ext_process_fields(sys);
return sys->cur;
}
/*
* Globals to hold our hostname. These variables are shared between
* the functions ext_name and iso_readlink, so that we don't have to
* call gethostname more than once.
*/
static char hostName[100];
static int gotHost = 0;
/*
* char *
* ext_get_time(char *tm, struct nfstime *to, int longForm)
*
* Description:
* Convert Rock Ridge time to NFS time. Rock Ridge can be in
* either xattr form (longForm == 1) or directory record form
* (longForm == 0).
*
* Parameters:
* tm pointer into a TF field
* to NFS time
* longForm whether to use xattr time (longForm == 1) or dir_t
* time (longForm == 0)
*
* Returns:
* tm advanced past this time record.
*/
char *
ext_get_time(char *tm, struct nfstime *to, int longForm)
{
struct rec_date_time *shortTime;
if (longForm) {
convert_time(to, (struct date_time *)tm, ISO);
tm += sizeof(struct date_time);
} else {
shortTime = (struct rec_date_time *)tm;
to->useconds = 0;
to->seconds =
convert_to_seconds(shortTime->year + 1900,
shortTime->month,
shortTime->day,
shortTime->hour,
shortTime->minute,
shortTime->second, 0,
shortTime->greenwich);
tm += sizeof(struct rec_date_time);
}
return tm;
}
/*
* static void
* check_for_extensions(void)
*
* Description:
* Check to see if this is a Rock Ridge CD. If it is, we need to
* set the global variable skipSysBytes to the number of bytes to
* skip in each system use area.
*/
static void
check_for_extensions(void)
{
int hasExtensions = 0, isRockRidge = 0, error, len, dirlen;
static char *rripid = "RRIP_1991A";
char *sysUse;
SYSUSE sys;
dir_t *dirp, *contents;
int entry_count;
if (0 != read_dir_entry(ROOT_DIR(), &dirp)) {
return;
}
rootSelfEntry = MKFD(dirp, 0, 0, cd_get_blksize(cd));
error = read_dir(dirp, rootSelfEntry, &contents, &dirlen);
free(dirp);
if (error) {
return;
}
/*
* Look at the system use area of the first entry of the root
* directory. Make sure that the first entry is the EXT_SYSUSE
* entry iff there are to be extensions.
*/
for (sysUse = ext_first_field(contents, rootSelfEntry, &sys), entry_count = 1;
sysUse; sysUse = ext_next_field(&sys), entry_count++) {
if (entry_count == 1 && MKSYSUSE(sysUse[0], sysUse[1]) == EXT_SYSUSE &&
sysUse[2] == 7 && sysUse[4] == 0xbe && sysUse[5] == 0xef) {
hasExtensions++;
skipSysBytes = sysUse[6];
} else if (hasExtensions && MKSYSUSE(sysUse[0], sysUse[1]) == EXT_EXT) {
len = strlen(rripid);
if (sysUse[4] == len &&
strncmp(sysUse + 8, rripid, len) == 0) {
isRockRidge++;
} else {
free(contents);
return;
}
}
}
hasExt = isRockRidge && hasExtensions;
free(contents);
ext_free_sys(&sys);
}
/*
* static void ext_parse_symlink(char *sysUse, EXT *ext)
*
* Description:
* Parse a rock ridge field pertaining to a symbolic link. Note
* that the link name can span several fields; we concatenate
* this round of names onto what was already there, so when
* starting fresh ext->path[0] has to be '\0'.
*
* Parameters:
* sysUse Pointer to the system use field with symlink info
* ext extension struct to get info
*/
static void
ext_parse_symlink(char *sysUse, EXT *ext)
{
dir_t *dirp;
int rv, error, len, compLen;
unsigned char flags, fieldFlags;
static char path[NFS_MAXPATHLEN];
char *comp, *component;
SYSUSE sys;
for (comp = sysUse + 5; comp - sysUse < sysUse[2];
comp += comp[1] + 2) {
flags = comp[0];
if (flags & NM_CUR) {
component = dot;
compLen = strlen(dot);
} else if (flags & NM_PAR) {
component = dotdot;
compLen = strlen(dotdot);
} else if (flags & NM_ROOT) {
component = "/";
compLen = strlen(component);
} else if (flags & NM_VOLROOT) {
component = mountPoint;
compLen = strlen(component);
} else if (flags & NM_HOST) {
if (!gotHost) {
if (gethostname(hostName, sizeof hostName - 1) < 0) {
continue;
}
gotHost = 1;
}
component = hostName;
compLen = strlen(component);
} else {
component = comp + 2;
compLen = comp[1];
}
len = strlen(ext->path) + compLen + (ext->doSlash ? 1 : 0);
if (len < sizeof ext->path) {
if (ext->doSlash) {
strcat(ext->path, "/");
}
strncat(ext->path, component, compLen);
ext->path[len] = '\0';
rv = 0;
}
/*
* Put a slash after this component if there's another
* one that's not a continuation of this one and if
* this one is not already a slash.
*/
ext->doSlash = !(flags & NM_CONT) && !(flags & NM_ROOT);
}
}
/*
* static void ext_parse_name(char *sysUse, EXT *ext)
*
* Description:
* Parse a NM rock ridge extension field. Note that like
* symlinks, the name can span multiple fields, so we concatenate
* what we find in the field with what was already there. To get
* started, ext->name[0] must be set to '\0'.
*
* Parameters:
* sysUse pointer to name system use field
* ext extension struct that gets name info
*/
static void
ext_parse_name(char *sysUse, EXT *ext)
{
char *component;
unsigned char flags;
int compLen;
int len;
flags = (unsigned char)sysUse[4];
if (flags & NM_CUR) {
component = dot;
compLen = strlen(dot);
} else if (flags & NM_PAR) {
component = dotdot;
compLen = strlen(dotdot);
} else if (flags & NM_ROOT) {
component = "/";
compLen = strlen(component);
} else if (flags & NM_VOLROOT) {
component = mountPoint;
compLen = strlen(component);
} else if (flags & NM_HOST) {
if (!gotHost) {
if (gethostname(hostName, sizeof hostName - 1) < 0) {
return;
}
gotHost = 1;
}
component = hostName;
compLen = strlen(component);
} else {
component = sysUse + 5;
compLen = sysUse[2] - 5;
}
len = strlen(ext->name) + compLen;
if (len < sizeof ext->name - 1) {
strncat(ext->name, component, compLen);
ext->name[len] = '\0';
}
}
/*
* static void ext_parse_mode(char *sysUse, EXT *ext)
*
* Description:
* Parse the rock ridge PX field
*
* Parameters:
* sysUse pointer to PX field
* ext extensions struct to get mode info
*/
static void
ext_parse_mode(char *sysUse, EXT *ext)
{
ext->mode = CHARSTOLONG(sysUse + 8);
ext->nlink = CHARSTOLONG(sysUse + 16);
ext->uid = CHARSTOLONG(sysUse + 24);
ext->gid = CHARSTOLONG(sysUse + 32);
if (S_ISDIR(ext->mode)) {
ext->type = NFDIR;
} else if (S_ISCHR(ext->mode)) {
ext->type = NFCHR;
} else if (S_ISBLK(ext->mode)) {
ext->type = NFBLK;
} else if (S_ISREG(ext->mode)) {
ext->type = NFREG;
} else if (S_ISFIFO(ext->mode)) {
ext->type = NFFIFO;
} else if (S_ISLNK(ext->mode)) {
ext->type = NFLNK;
} else if (S_ISSOCK(ext->mode)) {
ext->type = NFSOCK;
} else {
ext->type = NFBAD;
}
}
/*
* static void ext_parse_devnode(char *sysUse, EXT *ext)
*
* Description:
* Get device node from rock ridge extension field
*
* Parameters:
* sysUse pointer to PN field
* ext gets results
*/
static void
ext_parse_devnode(char *sysUse, EXT *ext)
{
ext->rdev = makedev(CHARSTOLONG(sysUse + 8),
CHARSTOLONG(sysUse + 16));
}
/*
* static void ext_parse_time(char *sysUse, EXT *ext)
*
* Description:
* Parse the rock ridge TF field. Note that multiple TF fields
* can be present in one system use area, so we have to be really
* careful about keeping track of our state in here. All the
* time related flags should be zeroed before processing a new
* system use area. See comment below.
*
* Parameters:
* sysUse pointer to TF field
* ext gets results
*/
static void
ext_parse_time(char *sysUse, EXT *ext)
{
char *tm;
unsigned char flags;
int longForm;
/*
* Parse the time field, setting flags as we go to
* indicate what we've found. The spec allows for any
* combinations of times to be specified in any number
* of fields, so we must be careful to cover some very
* weird cases, like modify and access are specified
* in two different fields and create is not.
*/
flags = sysUse[4];
longForm = !!(flags & TM_LONG);
tm = sysUse + 5;
if ((flags & TM_CREATE) && !ext->gotCTime) {
tm = ext_get_time(tm, &ext->ctime, longForm);
ext->gotCTime = 1;
}
if (flags & TM_MODIFY && !ext->gotMTime) {
tm = ext_get_time(tm, &ext->mtime, longForm);
ext->gotMTime = 1;
}
if (flags & TM_ACCESS && !ext->gotATime) {
ext_get_time(tm, &ext->atime, longForm);
ext->gotATime = 1;
}
}
/*
* static void ext_parse_extensions(dir_t *dirp, int fd, EXT *ext)
*
* Description:
* Parse all of the rock ridge extensions in a system use area
* into an EXT structure. We bzero the thing first, because we
* have to clear all of the flags to clear the state. Not all
* extensions will always be present, so we've got to keep track
* of what we see.
*
* Parameters:
* dirp directory entry we're parsing sys use field of
* fd file descriptor of fd (to check whether it's the
* rootSelfEntry in ext_first_field
* ext Gets results of parsing.
*/
static void
ext_parse_extensions(dir_t *dirp, int fd, EXT *ext)
{
char *sysUse;
SYSUSE sys;
bzero(ext, sizeof *ext);
for (sysUse = ext_first_field(dirp, fd, &sys);
sysUse; sysUse = ext_next_field(&sys)) {
switch (MKSYSUSE(sysUse[0], sysUse[1])) {
case EXT_SYMLINK:
ext_parse_symlink(sysUse, ext);
ext->gotPath = 1;
break;
case EXT_NAME:
ext_parse_name(sysUse, ext);
ext->gotName = 1;
break;
case EXT_MODE:
ext_parse_mode(sysUse, ext);
ext->gotMode = 1;
break;
case EXT_DEVNODE:
ext_parse_devnode(sysUse, ext);
break;
case EXT_TIME:
ext_parse_time(sysUse, ext);
break;
case EXT_CHILD:
ext->child = CHARSTOLONG(sysUse + 8);
break;
case EXT_PARENT:
ext->parent = CHARSTOLONG(sysUse + 8);
break;
case EXT_RELO:
ext->isRelocated = 1;
break;
}
}
ext_free_sys(&sys);
}
/*
* static int ext_get_relo_dir(EXT *ext, dir_t *inDir, int infd,
* dir_t **outDir, int *outfd)
*
* Description:
* If inDir refers to a relocated directory, this fills in
* *outDir with the self-referential directory entry for the
* relocated directory, which can fill the same role in directory
* entry processing. This means that we look at the rock ridge
* extensions, and if there's a CL or a PL field we use that.
*
* In the normal case, where ext->parent == ext->child == 0, we
* just set *outDir to indir and *outfd to infd so the caller can
* detect that nothing weird happened.
*
* Parameters:
* ext rock ridge extensions pointer
* inDir The directory under consideration
* infd fileid for inDir
* outDir Gets replacement directory entry
* outfd fileid for outfd
*
* Returns:
* 0 if successful, error code if failure
*/
static int
ext_get_relo_dir(EXT *ext, dir_t *inDir, int infd,
dir_t **outDir, int *outfd)
{
int blksize = cd_get_blksize(cd);
if (!ext->child && !ext->parent) {
*outDir = inDir;
*outfd = infd;
return 0;
}
*outfd = (ext->child ? ext->child : ext->parent) * blksize;
ISODBG(fprintf(stderr, ">>>>iso: ext_get_relo_dir: %d -> %d\n",
infd, *outfd));
return read_dir_entry(*outfd, outDir);
}
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