/*
* Check if the given file is a JAR file.
*
* Parameters:
* path - the path to the file to check for JAR magic.
*
* Returns:
* This function return NULL on success. Otherwise, errno is set, and it
* returns a message that indicates what caused the failure.
*/
const char * isJar(const char * path) {
const char * result = BAD_FILE_MSG;
int fd = open(path, O_RDONLY);
if (fd != -1) {
unsigned char buf[CHUNK_SIZE];
ssize_t count = read(fd, buf, CHUNK_SIZE);
if (count >= MIN_SIZE) {
result = BAD_MAGIC_MSG;
// be sure the file is at least a ZIP file
if (LOCSIG_AT(buf)) {
off_t flen = LOCNAM(buf);
off_t xlen = LOCEXT(buf);
off_t start = LOCHDR + flen;
off_t end = start + xlen;
if (end <= count) {
while (start < end) {
off_t xhid = SH(buf, start);
off_t xdlen = SH(buf, start + 2);
start += 4 + xdlen;
if (xhid == 0xcafe) {
// found the JAR magic
result = NULL;
break;
}
}
}
}
}
if (result != NULL) {
errno = BAD_MAGIC;
}
close (fd);
}
return (result);
}
static int
find_file(int fd, zentry *entry, const char *file_name)
{
int bytes;
int res;
int entry_size;
int read_size;
int base_offset;
Byte *p;
Byte *bp;
Byte *buffer;
Byte locbuf[LOCHDR];
if ((buffer = (Byte*)malloc(BUFSIZE)) == NULL) {
return(-1);
}
p = buffer;
bp = buffer;
/*
* Read the END Header, which is the starting point for ZIP files.
* (Clearly designed to make writing a zip file easier than reading
* one. Now isn't that precious...)
*/
if ((base_offset = find_end(fd, bp)) == -1) {
free(buffer);
return (-1);
}
/*
* There is a historical, but undocumented, ability to allow for
* additional "stuff" to be prepended to the zip/jar file. It seems
* that this has been used to prepend an actual java launcher
* executable to the jar on Windows. Although this is just another
* form of statically linking a small piece of the JVM to the
* application, we choose to continue to support it. Note that no
* guarantees have been made (or should be made) to the customer that
* this will continue to work.
*
* Therefore, calculate the base offset of the zip file (within the
* expanded file) by assuming that the central directory is followed
* immediately by the end record.
*/
base_offset = base_offset - ENDSIZ(p) - ENDOFF(p);
/*
* The END Header indicates the start of the Central Directory
* Headers. Remember that the desired Central Directory Header (CEN)
* will almost always be the second one and the first one is a small
* directory entry ("META-INF/"). Keep the code optimized for
* that case.
*
* Begin by seeking to the beginning of the Central Directory and
* reading in the first buffer full of bits.
*/
if (lseek(fd, base_offset + ENDOFF(p), SEEK_SET) < (off_t)0) {
free(buffer);
return (-1);
}
if ((bytes = read(fd, bp, MINREAD)) < 0) {
free(buffer);
return (-1);
}
/*
* Loop through the Central Directory Headers. Note that a valid zip/jar
* must have an ENDHDR (with ENDSIG) after the Central Directory.
*/
while (GETSIG(p) == CENSIG) {
/*
* If a complete header isn't in the buffer, shift the contents
* of the buffer down and refill the buffer. Note that the check
* for "bytes < CENHDR" must be made before the test for the entire
* size of the header, because if bytes is less than CENHDR, the
* actual size of the header can't be determined. The addition of
* SIGSIZ guarantees that the next signature is also in the buffer
* for proper loop termination.
*/
if (bytes < CENHDR) {
p = memmove(bp, p, bytes);
if ((res = read(fd, bp + bytes, MINREAD)) <= 0) {
free(buffer);
return (-1);
}
bytes += res;
}
entry_size = CENHDR + CENNAM(p) + CENEXT(p) + CENCOM(p);
if (bytes < entry_size + SIGSIZ) {
if (p != bp)
p = memmove(bp, p, bytes);
read_size = entry_size - bytes + SIGSIZ;
read_size = (read_size < MINREAD) ? MINREAD : read_size;
if ((res = read(fd, bp + bytes, read_size)) <= 0) {
free(buffer);
return (-1);
}
bytes += res;
}
/*
* Check if the name is the droid we are looking for; the jar file
* manifest. If so, build the entry record from the data found in
* the header located and return success.
*/
if (CENNAM(p) == strlen(file_name) &&
memcmp((p + CENHDR), file_name, strlen(file_name)) == 0) {
if (lseek(fd, base_offset + CENOFF(p), SEEK_SET) < (off_t)0) {
free(buffer);
return (-1);
}
if (read(fd, locbuf, LOCHDR) < 0) {
free(buffer);
return (-1);
}
if (GETSIG(locbuf) != LOCSIG) {
free(buffer);
return (-1);
}
entry->isize = CENLEN(p);
entry->csize = CENSIZ(p);
entry->offset = base_offset + CENOFF(p) + LOCHDR +
LOCNAM(locbuf) + LOCEXT(locbuf);
entry->how = CENHOW(p);
free(buffer);
return (0);
}
/*
* Point to the next entry and decrement the count of valid remaining
* bytes.
*/
bytes -= entry_size;
p += entry_size;
}
free(buffer);
return (-1); /* Fell off the end the loop without a Manifest */
}
/*ARGSUSED3*/
static int
javaexec(vnode_t *vp, struct execa *uap, struct uarg *args,
struct intpdata *idatap, int level, long *execsz, int setid,
caddr_t execfile, cred_t *cred, int brand_action)
{
struct intpdata idata;
int error;
ssize_t resid;
vnode_t *nvp;
off_t xoff, xoff_end;
char lochdr[LOCHDRSIZ];
struct pathname lookpn;
struct pathname resolvepn;
char *opath;
if (level)
return (ENOEXEC); /* no recursion */
/*
* Read in the full local file header, and validate
* the initial signature.
*/
if ((error = vn_rdwr(UIO_READ, vp, lochdr, sizeof (lochdr),
0, UIO_SYSSPACE, 0, (rlim64_t)0, cred, &resid)) != 0)
return (error);
if (resid != 0 || strncmp(lochdr, LOCSIG, SIGSIZ) != 0)
return (ENOEXEC);
/*
* Ok, so this -is- a ZIP file, and might even be a JAR file.
* Is it a Java executable?
*/
xoff = sizeof (lochdr) + LOCNAM(lochdr);
xoff_end = xoff + LOCEXT(lochdr);
while (xoff < xoff_end) {
char xfhdr[XFHSIZ];
if ((error = vn_rdwr(UIO_READ, vp, xfhdr, sizeof (xfhdr),
xoff, UIO_SYSSPACE, 0, (rlim64_t)0, cred, &resid)) != 0)
return (error);
if (resid != 0)
return (ENOEXEC);
if (XFHID(xfhdr) == XFJAVASIG)
break;
xoff += sizeof (xfhdr) + XFDATASIZ(xfhdr);
}
if (xoff >= xoff_end)
return (ENOEXEC);
/*
* Note: If we ever make setid execution work, we need to ensure
* that we use /dev/fd to avoid the classic setuid shell script
* security hole.
*/
if (setid)
return (EACCES);
/*
* Find and invoke the Java runtime environment on the file
*/
idata.intp = NULL;
idata.intp_name[0] = jexec;
idata.intp_arg[0] = jexec_arg;
if (error = pn_get(idata.intp_name[0], UIO_SYSSPACE, &lookpn))
return (error);
pn_alloc(&resolvepn);
if (error = lookuppn(&lookpn, &resolvepn, FOLLOW, NULLVPP, &nvp)) {
pn_free(&resolvepn);
pn_free(&lookpn);
return (ENOEXEC);
}
opath = args->pathname;
args->pathname = resolvepn.pn_path;
/* don't free resolvepn until we are done with args */
pn_free(&lookpn);
error = gexec(&nvp, uap, args, &idata, level + 1, execsz, execfile,
cred, EBA_NONE);
if (!error) {
/*
* Close this Java executable as the interpreter
* will open and close it later on.
*/
(void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, cred, NULL);
}
VN_RELE(nvp);
args->pathname = opath;
pn_free(&resolvepn);
return (error);
}
/**
* Writes all entries except ".class" to the data_file_handle,
* writes corresponding central directory records and the end of central
* directory record to the directory_file_handle.
* Treats .ZIP file format as documented in
* ftp://ftp.uu.net/pub/archiving/zip/doc/appnote-970311-iz.zip.
* Assumes that the .ZIP file doesn't span across multiple disks.
* Assumes that raw_current_entry()->nextCenOffset contains the offset
* of the first entry of the central directory (as set in the constructor).
* Returns true if completes successfully, false otherwise.
*/
bool
JarFileParser::copy_non_class_entries_to(OsFile_Handle data_file_handle,
OsFile_Handle directory_file_handle
JVM_TRAPS) {
UsingFastOops fast_oops;
BufferedFile::Fast jar_buffer = buffered_file();
const char class_suffix[] = {'.','c','l','a','s','s','\0'};
juint locOffset = raw_current_entry()->locOffset;
const juint buffer_size = MAX_ENTRY_NAME;
DECLARE_STATIC_BUFFER(unsigned char, buffer, buffer_size);
unsigned int name_length = 0;
juint loc_header_offset = 0;
juint cen_header_offset = 0;
size_t bytes_to_copy = 0;
unsigned int written_entry_count = 0;
unsigned int read_entry_count = 0;
unsigned int total_entry_count = raw_current_entry()->totalEntryCount;
// No OsFile_ routine to get the current position,
// so keep this information by ourselves.
juint data_file_position = 0;
juint directory_file_position = 0;
GUARANTEE(buffer_size >= LOCHDRSIZ &&
buffer_size >= EXTHDRSIZ &&
buffer_size >= ENDHDRSIZ &&
buffer_size >= MAX_ENTRY_NAME, "Buffer is too small");
if ((OsFile_seek(data_file_handle, 0L, SEEK_SET) < 0)
|| (OsFile_seek(directory_file_handle, 0L, SEEK_SET) < 0)) {
return false;
}
for (read_entry_count = 0; read_entry_count < total_entry_count;
read_entry_count++) {
// Find the next entry in the JAR.
bool found = find_entry(NULL JVM_MUST_SUCCEED);
if (!found) {
return false;
}
cen_header_offset = raw_current_entry()->nextCenOffset;
// If find_entry succeeded, centralHeader contains the central directory
// header for the found entry.
unsigned char *cenp = (unsigned char *)raw_current_entry()->centralHeader;
name_length = CENNAM(cenp);
if (name_length >= MAX_ENTRY_NAME) {
Throw::error(jarfile_error JVM_THROW_0);
} else {
jar_buffer().get_bytes(buffer, name_length);
if (!JarFileParser::match(class_suffix, (char*)buffer, name_length)) {
loc_header_offset = locOffset + CENOFF(cenp);
// Update the relative offset of local header
// in the central directory entry.
// Use little-endian order according to the .ZIP format.
Bytes::put_Java_u4(cenp + CENOFF_OFFSET,
Bytes::swap_u4(data_file_position));
// Write the central directory entry to the directory file.
if (OsFile_write(directory_file_handle,
cenp, 1, CENHDRSIZ) != CENHDRSIZ) {
return false;
}
directory_file_position += CENHDRSIZ;
// Write the file name to the direcory file.
if (OsFile_write(directory_file_handle,
buffer, 1, name_length) != name_length) {
return false;
}
directory_file_position += name_length;
// Copy the extra field and file comment to the directory file.
bytes_to_copy = CENEXT(cenp) + CENCOM(cenp);
if (block_copy(&jar_buffer, directory_file_handle,
bytes_to_copy) != bytes_to_copy) {
return false;
}
directory_file_position += bytes_to_copy;
// Copy the local file header to the data file.
if ((jar_buffer().seek(loc_header_offset, SEEK_SET) < 0)
|| (jar_buffer().get_bytes(buffer, LOCHDRSIZ) != LOCHDRSIZ)
|| (OsFile_write(data_file_handle,
buffer, 1, LOCHDRSIZ) != LOCHDRSIZ)) {
return false;
}
data_file_position += LOCHDRSIZ;
{
unsigned char *locp = (unsigned char *)buffer;
// Copy the file name, extra field and the compressed file data
// to the data file.
bytes_to_copy = LOCNAM(locp) + LOCEXT(locp) + CENSIZ(cenp);
if (block_copy(&jar_buffer, data_file_handle,
bytes_to_copy) != bytes_to_copy) {
return false;
}
data_file_position += bytes_to_copy;
// Check if the data descriptor exists.
if ((LOCFLG(locp) & 8) == 8) {
// Copy the data descriptor to the data file.
if (jar_buffer().get_bytes(buffer, EXTHDRSIZ) != EXTHDRSIZ) {
return false;
}
// The data descriptor may or may not start with the signature
// depending on .ZIP file format revision used.
if (GETSIG(buffer) == EXTSIG) {
// According to the Info-ZIP Application Note 970311,
// the data descriptor starts with the signature.
if (OsFile_write(data_file_handle,
buffer, 1, EXTHDRSIZ) != EXTHDRSIZ) {
return false;
}
data_file_position += EXTHDRSIZ;
} else {
// According to the .ZIP format specification version 6.1.0,
// the data descriptor doesn't start with the signature.
if (OsFile_write(data_file_handle,
buffer, 1, EXTHDRSIZ - 4) != EXTHDRSIZ - 4) {
return false;
}
data_file_position += EXTHDRSIZ - 4;
}
}
}
written_entry_count++;
}
}
cen_header_offset += CENHDRSIZ + name_length + CENEXT(cenp) + CENCOM(cenp);
raw_current_entry()->nextCenOffset = cen_header_offset;
}
// Now that all central directory entries are processed,
// cen_header_offset points to the end of the central directory.
if (jar_buffer().seek(cen_header_offset, SEEK_SET) < 0) {
return false;
}
if (jar_buffer().get_bytes(buffer, ENDHDRSIZ) != ENDHDRSIZ) {
return false;
}
{
unsigned char *endp = (unsigned char *)buffer;
if (GETSIG(endp) != ENDSIG) {
return false;
}
// Update the record to match the new number of entries.
// Use little-endian order according to the .ZIP format.
Bytes::put_Java_u2(endp + ENDSUB_OFFSET,
Bytes::swap_u2(written_entry_count));
Bytes::put_Java_u2(endp + ENDTOT_OFFSET,
Bytes::swap_u2(written_entry_count));
// The size of the central directory is exactly
// the number of bytes written to the directory_file.
Bytes::put_Java_u4(endp + ENDSIZ_OFFSET,
Bytes::swap_u4(directory_file_position));
// The offset of the central directory is exactly
// the number of bytes written to the data_file.
Bytes::put_Java_u4(endp + ENDOFF_OFFSET,
Bytes::swap_u4(data_file_position));
if (OsFile_write(directory_file_handle, endp, 1, ENDHDRSIZ) != ENDHDRSIZ) {
return false;
}
if (block_copy(&jar_buffer,
directory_file_handle, ENDCOM(endp)) != (size_t)ENDCOM(endp)) {
return false;
}
}
return true;
}
/*
* Locate the manifest file with the zip/jar file.
*
* fd: File descriptor of the jar file.
* entry: To be populated with the information necessary to perform
* the inflation (the compressed and uncompressed sizes and
* the offset in the file where the compressed data is located).
*
* Returns zero upon success. Returns a negative value upon failure.
*
* The buffer for reading the Central Directory if the zip/jar file needs
* to be large enough to accommodate the largest possible single record
* and the signature of the next record which is:
*
* 3*2**16 + CENHDR + SIGSIZ
*
* Each of the three variable sized fields (name, comment and extension)
* has a maximum possible size of 64k.
*
* Typically, only a small bit of this buffer is used with bytes shuffled
* down to the beginning of the buffer. It is one thing to allocate such
* a large buffer and another thing to actually start faulting it in.
*
* In most cases, all that needs to be read are the first two entries in
* a typical jar file (META-INF and META-INF/MANIFEST.MF). Keep this factoid
* in mind when optimizing this code.
*/
static int
find_file(int fd, zentry *entry, const char *file_name)
{
int bytes;
int res;
int entry_size;
int read_size;
jlong base_offset;
Byte *p;
Byte *bp;
Byte *buffer;
Byte locbuf[LOCHDR];
if ((buffer = (Byte*)malloc(BUFSIZE)) == NULL) {
return(-1);
}
bp = buffer;
base_offset = compute_cen(fd, bp);
if (base_offset == -1) {
free(buffer);
return -1;
}
if ((bytes = read(fd, bp, MINREAD)) < 0) {
free(buffer);
return (-1);
}
p = bp;
/*
* Loop through the Central Directory Headers. Note that a valid zip/jar
* must have an ENDHDR (with ENDSIG) after the Central Directory.
*/
while (GETSIG(p) == CENSIG) {
/*
* If a complete header isn't in the buffer, shift the contents
* of the buffer down and refill the buffer. Note that the check
* for "bytes < CENHDR" must be made before the test for the entire
* size of the header, because if bytes is less than CENHDR, the
* actual size of the header can't be determined. The addition of
* SIGSIZ guarantees that the next signature is also in the buffer
* for proper loop termination.
*/
if (bytes < CENHDR) {
p = memmove(bp, p, bytes);
if ((res = read(fd, bp + bytes, MINREAD)) <= 0) {
free(buffer);
return (-1);
}
bytes += res;
}
entry_size = CENHDR + CENNAM(p) + CENEXT(p) + CENCOM(p);
if (bytes < entry_size + SIGSIZ) {
if (p != bp)
p = memmove(bp, p, bytes);
read_size = entry_size - bytes + SIGSIZ;
read_size = (read_size < MINREAD) ? MINREAD : read_size;
if ((res = read(fd, bp + bytes, read_size)) <= 0) {
free(buffer);
return (-1);
}
bytes += res;
}
/*
* Check if the name is the droid we are looking for; the jar file
* manifest. If so, build the entry record from the data found in
* the header located and return success.
*/
if ((size_t)CENNAM(p) == JLI_StrLen(file_name) &&
memcmp((p + CENHDR), file_name, JLI_StrLen(file_name)) == 0) {
if (JLI_Lseek(fd, base_offset + CENOFF(p), SEEK_SET) < (jlong)0) {
free(buffer);
return (-1);
}
if (read(fd, locbuf, LOCHDR) < 0) {
free(buffer);
return (-1);
}
if (GETSIG(locbuf) != LOCSIG) {
free(buffer);
return (-1);
}
entry->isize = CENLEN(p);
entry->csize = CENSIZ(p);
entry->offset = base_offset + CENOFF(p) + LOCHDR +
LOCNAM(locbuf) + LOCEXT(locbuf);
entry->how = CENHOW(p);
free(buffer);
return (0);
}
/*
* Point to the next entry and decrement the count of valid remaining
* bytes.
*/
bytes -= entry_size;
p += entry_size;
}
free(buffer);
return (-1); /* Fell off the end the loop without a Manifest */
}
