static int
ar_parse_common_header(struct ar *ar, struct archive_entry *entry,
const char *h)
{
uint64_t n;
/* Copy remaining header */
archive_entry_set_mtime(entry,
(time_t)ar_atol10(h + AR_date_offset, AR_date_size), 0L);
archive_entry_set_uid(entry,
(uid_t)ar_atol10(h + AR_uid_offset, AR_uid_size));
archive_entry_set_gid(entry,
(gid_t)ar_atol10(h + AR_gid_offset, AR_gid_size));
archive_entry_set_mode(entry,
(mode_t)ar_atol8(h + AR_mode_offset, AR_mode_size));
n = ar_atol10(h + AR_size_offset, AR_size_size);
ar->entry_offset = 0;
ar->entry_padding = n % 2;
archive_entry_set_size(entry, n);
ar->entry_bytes_remaining = n;
return (ARCHIVE_OK);
}
static int
_ar_read_header(struct archive_read *a, struct archive_entry *entry,
struct ar *ar, const char *h, size_t *unconsumed)
{
char filename[AR_name_size + 1];
uint64_t number; /* Used to hold parsed numbers before validation. */
size_t bsd_name_length, entry_size;
char *p, *st;
const void *b;
int r;
/* Verify the magic signature on the file header. */
if (strncmp(h + AR_fmag_offset, "`\n", 2) != 0) {
archive_set_error(&a->archive, EINVAL,
"Incorrect file header signature");
return (ARCHIVE_FATAL);
}
/* Copy filename into work buffer. */
strncpy(filename, h + AR_name_offset, AR_name_size);
filename[AR_name_size] = '\0';
/*
* Guess the format variant based on the filename.
*/
if (a->archive.archive_format == ARCHIVE_FORMAT_AR) {
/* We don't already know the variant, so let's guess. */
/*
* Biggest clue is presence of '/': GNU starts special
* filenames with '/', appends '/' as terminator to
* non-special names, so anything with '/' should be
* GNU except for BSD long filenames.
*/
if (strncmp(filename, "#1/", 3) == 0)
a->archive.archive_format = ARCHIVE_FORMAT_AR_BSD;
else if (strchr(filename, '/') != NULL)
a->archive.archive_format = ARCHIVE_FORMAT_AR_GNU;
else if (strncmp(filename, "__.SYMDEF", 9) == 0)
a->archive.archive_format = ARCHIVE_FORMAT_AR_BSD;
/*
* XXX Do GNU/SVR4 'ar' programs ever omit trailing '/'
* if name exactly fills 16-byte field? If so, we
* can't assume entries without '/' are BSD. XXX
*/
}
/* Update format name from the code. */
if (a->archive.archive_format == ARCHIVE_FORMAT_AR_GNU)
a->archive.archive_format_name = "ar (GNU/SVR4)";
else if (a->archive.archive_format == ARCHIVE_FORMAT_AR_BSD)
a->archive.archive_format_name = "ar (BSD)";
else
a->archive.archive_format_name = "ar";
/*
* Remove trailing spaces from the filename. GNU and BSD
* variants both pad filename area out with spaces.
* This will only be wrong if GNU/SVR4 'ar' implementations
* omit trailing '/' for 16-char filenames and we have
* a 16-char filename that ends in ' '.
*/
p = filename + AR_name_size - 1;
while (p >= filename && *p == ' ') {
*p = '\0';
p--;
}
/*
* Remove trailing slash unless first character is '/'.
* (BSD entries never end in '/', so this will only trim
* GNU-format entries. GNU special entries start with '/'
* and are not terminated in '/', so we don't trim anything
* that starts with '/'.)
*/
if (filename[0] != '/' && p > filename && *p == '/') {
*p = '\0';
}
if (p < filename) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Found entry with empty filename");
return (ARCHIVE_FATAL);
}
/*
* '//' is the GNU filename table.
* Later entries can refer to names in this table.
*/
if (strcmp(filename, "//") == 0) {
/* This must come before any call to _read_ahead. */
ar_parse_common_header(ar, entry, h);
archive_entry_copy_pathname(entry, filename);
archive_entry_set_filetype(entry, AE_IFREG);
/* Get the size of the filename table. */
number = ar_atol10(h + AR_size_offset, AR_size_size);
if (number > SIZE_MAX || number > 1024 * 1024 * 1024) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Filename table too large");
return (ARCHIVE_FATAL);
}
entry_size = (size_t)number;
if (entry_size == 0) {
archive_set_error(&a->archive, EINVAL,
"Invalid string table");
return (ARCHIVE_FATAL);
}
if (ar->strtab != NULL) {
archive_set_error(&a->archive, EINVAL,
"More than one string tables exist");
return (ARCHIVE_FATAL);
}
/* Read the filename table into memory. */
st = malloc(entry_size);
if (st == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate filename table buffer");
return (ARCHIVE_FATAL);
}
ar->strtab = st;
ar->strtab_size = entry_size;
if (*unconsumed) {
__archive_read_consume(a, *unconsumed);
*unconsumed = 0;
}
if ((b = __archive_read_ahead(a, entry_size, NULL)) == NULL)
return (ARCHIVE_FATAL);
memcpy(st, b, entry_size);
__archive_read_consume(a, entry_size);
/* All contents are consumed. */
ar->entry_bytes_remaining = 0;
archive_entry_set_size(entry, ar->entry_bytes_remaining);
/* Parse the filename table. */
return (ar_parse_gnu_filename_table(a));
}
/*
* GNU variant handles long filenames by storing /<number>
* to indicate a name stored in the filename table.
* XXX TODO: Verify that it's all digits... Don't be fooled
* by "/9xyz" XXX
*/
if (filename[0] == '/' && filename[1] >= '0' && filename[1] <= '9') {
number = ar_atol10(h + AR_name_offset + 1, AR_name_size - 1);
/*
* If we can't look up the real name, warn and return
* the entry with the wrong name.
*/
if (ar->strtab == NULL || number >= ar->strtab_size) {
archive_set_error(&a->archive, EINVAL,
"Can't find long filename for GNU/SVR4 archive entry");
archive_entry_copy_pathname(entry, filename);
/* Parse the time, owner, mode, size fields. */
ar_parse_common_header(ar, entry, h);
return (ARCHIVE_FATAL);
}
archive_entry_copy_pathname(entry, &ar->strtab[(size_t)number]);
/* Parse the time, owner, mode, size fields. */
return (ar_parse_common_header(ar, entry, h));
}
/*
* BSD handles long filenames by storing "#1/" followed by the
* length of filename as a decimal number, then prepends the
* the filename to the file contents.
*/
if (strncmp(filename, "#1/", 3) == 0) {
/* Parse the time, owner, mode, size fields. */
/* This must occur before _read_ahead is called again. */
ar_parse_common_header(ar, entry, h);
/* Parse the size of the name, adjust the file size. */
number = ar_atol10(h + AR_name_offset + 3, AR_name_size - 3);
/* Sanity check the filename length:
* = Must be <= SIZE_MAX - 1
* = Must be <= 1MB
* = Cannot be bigger than the entire entry
*/
if (number > SIZE_MAX - 1
|| number > 1024 * 1024
|| (int64_t)number > ar->entry_bytes_remaining) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Bad input file size");
return (ARCHIVE_FATAL);
}
bsd_name_length = (size_t)number;
ar->entry_bytes_remaining -= bsd_name_length;
/* Adjust file size reported to client. */
archive_entry_set_size(entry, ar->entry_bytes_remaining);
if (*unconsumed) {
__archive_read_consume(a, *unconsumed);
*unconsumed = 0;
}
/* Read the long name into memory. */
if ((b = __archive_read_ahead(a, bsd_name_length, NULL)) == NULL) {
archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
"Truncated input file");
return (ARCHIVE_FATAL);
}
/* Store it in the entry. */
p = (char *)malloc(bsd_name_length + 1);
if (p == NULL) {
archive_set_error(&a->archive, ENOMEM,
"Can't allocate fname buffer");
return (ARCHIVE_FATAL);
}
strncpy(p, b, bsd_name_length);
p[bsd_name_length] = '\0';
__archive_read_consume(a, bsd_name_length);
archive_entry_copy_pathname(entry, p);
free(p);
return (ARCHIVE_OK);
}
/*
* "/" is the SVR4/GNU archive symbol table.
* "/SYM64/" is the SVR4/GNU 64-bit variant archive symbol table.
*/
if (strcmp(filename, "/") == 0 || strcmp(filename, "/SYM64/") == 0) {
archive_entry_copy_pathname(entry, filename);
/* Parse the time, owner, mode, size fields. */
r = ar_parse_common_header(ar, entry, h);
/* Force the file type to a regular file. */
archive_entry_set_filetype(entry, AE_IFREG);
return (r);
}
/*
* "__.SYMDEF" is a BSD archive symbol table.
*/
if (strcmp(filename, "__.SYMDEF") == 0) {
archive_entry_copy_pathname(entry, filename);
/* Parse the time, owner, mode, size fields. */
return (ar_parse_common_header(ar, entry, h));
}
/*
* Otherwise, this is a standard entry. The filename
* has already been trimmed as much as possible, based
* on our current knowledge of the format.
*/
archive_entry_copy_pathname(entry, filename);
return (ar_parse_common_header(ar, entry, h));
}
