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Various fixes.

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* src/xattrs.c: Don't mix variable declarations and statements.
Use proper data types.  Remove improper use of const qualifiers.
Use x2nrealloc to reallocate memory buffers.
This commit is contained in:
Sergey Poznyakoff
2012-11-19 00:14:31 +02:00
parent 4ac671c49b
commit 3c4e51fad6
1 changed files with 182 additions and 196 deletions
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378
src/xattrs.c
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@@ -7,7 +7,7 @@
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any later
Free Software Foundation; either version 2, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but
@@ -33,8 +33,8 @@
struct xattrs_mask_map
{
const char **masks;
int size;
int used;
size_t size;
size_t used;
};
/* list of fnmatch patterns */
@@ -136,34 +136,33 @@ perms2acl (int perms)
static char *
skip_to_ext_fields (char *ptr)
{
ptr += strcspn (ptr, ":,\n"); /* skip tag name. Ie. user/group/default/mask */
/* skip tag name (user/group/default/mask) */
ptr += strcspn (ptr, ":,\n");
if (*ptr != ':')
return ptr; /* error? no user/group field */
return ptr;
++ptr;
ptr += strcspn (ptr, ":,\n"); /* skip user/group name */
ptr += strcspn (ptr, ":,\n"); /* skip user/group name */
if (*ptr != ':')
return ptr; /* error? no perms field */
return ptr;
++ptr;
ptr += strcspn (ptr, ":,\n"); /* skip perms */
if (*ptr != ':')
return ptr; /* no extra fields */
ptr += strcspn (ptr, ":,\n"); /* skip perms */
return ptr;
}
/* The POSIX draft allows extra fields after the three main ones. Star
uses this to add a fourth field for user/group which is the numeric ID.
We just skip all extra fields atm. */
static const char *
fixup_extra_acl_fields (const char *ptr)
This function removes such extra fields by overwriting them with the
characters that follow. */
static char *
fixup_extra_acl_fields (char *ptr)
{
char *src = (char *) ptr;
char *dst = (char *) ptr;
char *src = ptr;
char *dst = ptr;
while (*src)
{
@@ -173,14 +172,14 @@ fixup_extra_acl_fields (const char *ptr)
src = skip_to_ext_fields (src);
len = src - old;
if (old != dst)
memmove (dst, old, len);
memmove (dst, old, len);
dst += len;
if (*src == ':') /* We have extra fields, skip them all */
src += strcspn (src, "\n,");
if (*src == ':') /* We have extra fields, skip them all */
src += strcspn (src, "\n,");
if ((*src == '\n') || (*src == ','))
*dst++ = *src++; /* also done when dst == src, but that's ok */
*dst++ = *src++; /* also done when dst == src, but that's ok */
}
if (src != dst)
*dst = 0;
@@ -188,11 +187,12 @@ fixup_extra_acl_fields (const char *ptr)
return ptr;
}
/* "system.posix_acl_access" */
static void
xattrs__acls_set (struct tar_stat_info const *st,
char const *file_name, int type,
const char *ptr, size_t len, bool def)
{ /* "system.posix_acl_access" */
char const *file_name, int type,
char *ptr, size_t len, bool def)
{
acl_t acl;
if (ptr)
@@ -206,10 +206,10 @@ xattrs__acls_set (struct tar_stat_info const *st,
else if (acls_option > 0)
acl = perms2acl (st->stat.st_mode);
else
return; /* don't call acl functions unless we first hit an ACL, or
--acls was passed explicitly */
return; /* don't call acl functions unless we first hit an ACL, or
--acls was passed explicitly */
if (acl == (acl_t) NULL)
if (!acl)
{
call_arg_warn ("acl_from_text", file_name);
return;
@@ -219,7 +219,7 @@ xattrs__acls_set (struct tar_stat_info const *st,
/* warn even if filesystem does not support acls */
WARNOPT (WARN_XATTR_WRITE,
(0, errno,
_("acl_set_file_at: Cannot set POSIX ACLs for file '%s'"),
_ ("acl_set_file_at: Cannot set POSIX ACLs for file '%s'"),
file_name));
acl_free (acl);
@@ -227,25 +227,24 @@ xattrs__acls_set (struct tar_stat_info const *st,
static void
xattrs__acls_get_a (int parentfd, const char *file_name,
struct tar_stat_info *st,
char **ret_ptr, size_t * ret_len)
{ /* "system.posix_acl_access" */
struct tar_stat_info *st,
char **ret_ptr, size_t * ret_len)
{
char *val = NULL;
ssize_t len;
acl_t acl;
if ((acl = acl_get_file_at (parentfd, file_name, ACL_TYPE_ACCESS))
== (acl_t) NULL)
if (!(acl = acl_get_file_at (parentfd, file_name, ACL_TYPE_ACCESS)))
{
if (errno != ENOTSUP)
call_arg_warn ("acl_get_file_at", file_name);
call_arg_warn ("acl_get_file_at", file_name);
return;
}
val = acl_to_text (acl, &len);
acl_free (acl);
if (val == NULL)
if (!val)
{
call_arg_warn ("acl_to_text", file_name);
return;
@@ -257,27 +256,27 @@ xattrs__acls_get_a (int parentfd, const char *file_name,
acl_free (val);
}
/* "system.posix_acl_default" */
static void
xattrs__acls_get_d (int parentfd, char const *file_name,
struct tar_stat_info *st,
char **ret_ptr, size_t * ret_len)
{ /* "system.posix_acl_default" */
struct tar_stat_info *st,
char **ret_ptr, size_t * ret_len)
{
char *val = NULL;
ssize_t len;
acl_t acl;
if ((acl = acl_get_file_at (parentfd, file_name, ACL_TYPE_DEFAULT))
== (acl_t) NULL)
if (!(acl = acl_get_file_at (parentfd, file_name, ACL_TYPE_DEFAULT)))
{
if (errno != ENOTSUP)
call_arg_warn ("acl_get_file_at", file_name);
call_arg_warn ("acl_get_file_at", file_name);
return;
}
val = acl_to_text (acl, &len);
acl_free (acl);
if (val == NULL)
if (!val)
{
call_arg_warn ("acl_to_text", file_name);
return;
@@ -292,26 +291,26 @@ xattrs__acls_get_d (int parentfd, char const *file_name,
static void
acls_one_line (const char *prefix, char delim,
const char *aclstring, size_t len)
const char *aclstring, size_t len)
{
/* support both long and short text representation of posix acls */
struct obstack stk;
obstack_init (&stk);
int pref_len = strlen (prefix);
const char *oldstring = aclstring;
int pos = 0;
if (!aclstring || !len)
return;
int pos = 0;
obstack_init (&stk);
while (pos <= len)
{
int move = strcspn (aclstring, ",\n");
if (!move)
break;
break;
if (oldstring != aclstring)
obstack_1grow (&stk, delim);
obstack_1grow (&stk, delim);
obstack_grow (&stk, prefix, pref_len);
obstack_grow (&stk, aclstring, move);
@@ -320,60 +319,59 @@ acls_one_line (const char *prefix, char delim,
}
obstack_1grow (&stk, '\0');
const char *toprint = obstack_finish (&stk);
fprintf (stdlis, "%s", toprint);
fprintf (stdlis, "%s", (char *) obstack_finish (&stk));
obstack_free (&stk, NULL);
}
void
xattrs_acls_get (int parentfd, char const *file_name,
struct tar_stat_info *st, int fd, int xisfile)
struct tar_stat_info *st, int fd, int xisfile)
{
if (acls_option > 0)
{
#ifndef HAVE_POSIX_ACLS
static int done = 0;
if (!done)
WARN ((0, 0, _("POSIX ACL support is not available")));
WARN ((0, 0, _("POSIX ACL support is not available")));
done = 1;
#else
int err = file_has_acl_at (parentfd, file_name, &st->stat);
if (err == 0)
return;
return;
if (err == -1)
{
call_arg_warn ("file_has_acl_at", file_name);
return;
}
{
call_arg_warn ("file_has_acl_at", file_name);
return;
}
xattrs__acls_get_a (parentfd, file_name, st,
&st->acls_a_ptr, &st->acls_a_len);
&st->acls_a_ptr, &st->acls_a_len);
if (!xisfile)
xattrs__acls_get_d (parentfd, file_name, st,
&st->acls_d_ptr, &st->acls_d_len);
xattrs__acls_get_d (parentfd, file_name, st,
&st->acls_d_ptr, &st->acls_d_len);
#endif
}
}
void
xattrs_acls_set (struct tar_stat_info const *st,
char const *file_name, char typeflag)
char const *file_name, char typeflag)
{
if ((acls_option > 0) && (typeflag != SYMTYPE))
if (acls_option > 0 && typeflag != SYMTYPE)
{
#ifndef HAVE_POSIX_ACLS
static int done = 0;
if (!done)
WARN ((0, 0, _("POSIX ACL support is not available")));
WARN ((0, 0, _("POSIX ACL support is not available")));
done = 1;
#else
xattrs__acls_set (st, file_name, ACL_TYPE_ACCESS,
st->acls_a_ptr, st->acls_a_len, false);
if ((typeflag == DIRTYPE) || (typeflag == GNUTYPE_DUMPDIR))
xattrs__acls_set (st, file_name, ACL_TYPE_DEFAULT,
st->acls_d_ptr, st->acls_d_len, true);
st->acls_a_ptr, st->acls_a_len, false);
if (typeflag == DIRTYPE || typeflag == GNUTYPE_DUMPDIR)
xattrs__acls_set (st, file_name, ACL_TYPE_DEFAULT,
st->acls_d_ptr, st->acls_d_len, true);
#endif
}
}
@@ -381,26 +379,19 @@ xattrs_acls_set (struct tar_stat_info const *st,
static void
mask_map_realloc (struct xattrs_mask_map *map)
{
if (map->size == 0)
if (map->used == map->size)
{
map->size = 4;
map->masks = xmalloc (16 * sizeof (char *));
return;
}
if (map->size <= map->used)
{
map->size *= 2;
map->masks = xrealloc (map->masks, map->size * sizeof (char *));
return;
if (map->size == 0)
map->size = 4;
map->masks = x2nrealloc (map->masks, &map->size, sizeof (map->masks[0]));
}
}
void
xattrs_mask_add (const char *mask, bool incl)
{
struct xattrs_mask_map *mask_map = incl ? &xattrs_setup.incl
: &xattrs_setup.excl;
struct xattrs_mask_map *mask_map =
incl ? &xattrs_setup.incl : &xattrs_setup.excl;
/* ensure there is enough space */
mask_map_realloc (mask_map);
/* just assign pointers -- we silently expect that pointer "mask" is valid
@@ -426,79 +417,77 @@ xattrs_clear_setup ()
includes all the user.*, security.*, system.*, etc. available domains */
void
xattrs_xattrs_get (int parentfd, char const *file_name,
struct tar_stat_info *st, int fd)
struct tar_stat_info *st, int fd)
{
if (xattrs_option > 0)
{
#ifndef HAVE_XATTRS
static int done = 0;
if (!done)
WARN ((0, 0, _("XATTR support is not available")));
WARN ((0, 0, _("XATTR support is not available")));
done = 1;
#else
static ssize_t xsz = 1024;
static size_t xsz = 1024;
static char *xatrs = NULL;
ssize_t xret = -1;
if (!xatrs)
xatrs = xmalloc (xsz);
xatrs = x2nrealloc (xatrs, &xsz, 1);
while (((fd == 0) ?
((xret =
llistxattrat (parentfd, file_name, xatrs, xsz)) == -1) :
((xret = flistxattr (fd, xatrs, xsz)) == -1))
&& (errno == ERANGE))
{
xsz <<= 1;
xatrs = xrealloc (xatrs, xsz);
}
((xret =
llistxattrat (parentfd, file_name, xatrs, xsz)) == -1) :
((xret = flistxattr (fd, xatrs, xsz)) == -1))
&& (errno == ERANGE))
{
xatrs = x2nrealloc (xatrs, &xsz, 1);
}
if (xret == -1)
call_arg_warn ((fd == 0) ? "llistxattrat" : "flistxattr", file_name);
call_arg_warn ((fd == 0) ? "llistxattrat" : "flistxattr", file_name);
else
{
const char *attr = xatrs;
static ssize_t asz = 1024;
static char *val = NULL;
{
const char *attr = xatrs;
static size_t asz = 1024;
static char *val = NULL;
if (!val)
val = xmalloc (asz);
if (!val)
val = x2nrealloc (val, &asz, 1);
while (xret > 0)
{
size_t len = strlen (attr);
ssize_t aret = 0;
while (xret > 0)
{
size_t len = strlen (attr);
ssize_t aret = 0;
/* Archive all xattrs during creation, decide at extraction time
* which ones are of interest/use for the target filesystem. */
while (((fd == 0)
? ((aret = lgetxattrat (parentfd, file_name, attr,
val, asz)) == -1)
: ((aret = fgetxattr (fd, attr, val, asz)) == -1))
&& (errno == ERANGE))
{
asz <<= 1;
val = xrealloc (val, asz);
}
/* Archive all xattrs during creation, decide at extraction time
* which ones are of interest/use for the target filesystem. */
while (((fd == 0)
? ((aret = lgetxattrat (parentfd, file_name, attr,
val, asz)) == -1)
: ((aret = fgetxattr (fd, attr, val, asz)) == -1))
&& (errno == ERANGE))
{
val = x2nrealloc (val, &asz, 1);
}
if (aret != -1)
xheader_xattr_add (st, attr, val, aret);
else if (errno != ENOATTR)
call_arg_warn ((fd == 0) ? "lgetxattrat"
: "fgetxattr", file_name);
if (aret != -1)
xheader_xattr_add (st, attr, val, aret);
else if (errno != ENOATTR)
call_arg_warn ((fd == 0) ? "lgetxattrat"
: "fgetxattr", file_name);
attr += len + 1;
xret -= len + 1;
}
}
attr += len + 1;
xret -= len + 1;
}
}
#endif
}
}
static void
xattrs__fd_set (struct tar_stat_info const *st,
char const *file_name, char typeflag,
const char *attr, const char *ptr, size_t len)
char const *file_name, char typeflag,
const char *attr, const char *ptr, size_t len)
{
if (ptr)
{
@@ -506,15 +495,15 @@ xattrs__fd_set (struct tar_stat_info const *st,
int ret = -1;
if (typeflag != SYMTYPE)
ret = setxattrat (chdir_fd, file_name, attr, ptr, len, 0);
ret = setxattrat (chdir_fd, file_name, attr, ptr, len, 0);
else
{
sysname = "lsetxattr";
ret = lsetxattrat (chdir_fd, file_name, attr, ptr, len, 0);
}
{
sysname = "lsetxattr";
ret = lsetxattrat (chdir_fd, file_name, attr, ptr, len, 0);
}
if (ret == -1)
WARNOPT (WARN_XATTR_WRITE,
WARNOPT (WARN_XATTR_WRITE,
(0, errno,
_("%s: Cannot set '%s' extended attribute for file '%s'"),
sysname, attr, file_name));
@@ -525,56 +514,57 @@ xattrs__fd_set (struct tar_stat_info const *st,
zero, otherwise the fgetfileconat is used against correct file descriptor */
void
xattrs_selinux_get (int parentfd, char const *file_name,
struct tar_stat_info *st, int fd)
struct tar_stat_info *st, int fd)
{
if (selinux_context_option > 0)
{
#if HAVE_SELINUX_SELINUX_H != 1
static int done = 0;
if (!done)
WARN ((0, 0, _("SELinux support is not available")));
WARN ((0, 0, _("SELinux support is not available")));
done = 1;
#else
int result = (fd ? fgetfilecon (fd, &st->cntx_name)
: lgetfileconat (parentfd, file_name, &st->cntx_name));
int result = fd ?
fgetfilecon (fd, &st->cntx_name)
: lgetfileconat (parentfd, file_name, &st->cntx_name);
if (result == -1 && errno != ENODATA && errno != ENOTSUP)
call_arg_warn (fd ? "fgetfilecon" : "lgetfileconat", file_name);
call_arg_warn (fd ? "fgetfilecon" : "lgetfileconat", file_name);
#endif
}
}
void
xattrs_selinux_set (struct tar_stat_info const *st,
char const *file_name, char typeflag)
char const *file_name, char typeflag)
{
if (selinux_context_option > 0)
{
#if HAVE_SELINUX_SELINUX_H != 1
static int done = 0;
if (!done)
WARN ((0, 0, _("SELinux support is not available")));
WARN ((0, 0, _("SELinux support is not available")));
done = 1;
#else
const char *sysname = "setfilecon";
int ret;
if (!st->cntx_name)
return;
return;
if (typeflag != SYMTYPE)
{
ret = setfileconat (chdir_fd, file_name, st->cntx_name);
sysname = "setfileconat";
}
{
ret = setfileconat (chdir_fd, file_name, st->cntx_name);
sysname = "setfileconat";
}
else
{
ret = lsetfileconat (chdir_fd, file_name, st->cntx_name);
sysname = "lsetfileconat";
}
{
ret = lsetfileconat (chdir_fd, file_name, st->cntx_name);
sysname = "lsetfileconat";
}
if (ret == -1)
WARNOPT (WARN_XATTR_WRITE,
WARNOPT (WARN_XATTR_WRITE,
(0, errno,
_("%s: Cannot set SELinux context for file '%s'"),
sysname, file_name));
@@ -597,27 +587,24 @@ xattrs_matches_mask (const char *kw, struct xattrs_mask_map *mm)
return false;
}
#define USER_DOT_PFX "user."
static bool
xattrs_kw_included (const char *kw, bool archiving)
{
if (xattrs_setup.incl.size)
return xattrs_matches_mask (kw, &xattrs_setup.incl);
else if (archiving)
return true;
else
{
if (archiving)
return true;
else
return strncmp (kw, "user.", strlen ("user.")) == 0;
}
return strncmp (kw, USER_DOT_PFX, sizeof (USER_DOT_PFX) - 1) == 0;
}
static bool
xattrs_kw_excluded (const char *kw, bool archiving)
{
if (!xattrs_setup.excl.size)
return false;
return xattrs_matches_mask (kw, &xattrs_setup.excl);
return xattrs_setup.excl.size ?
xattrs_matches_mask (kw, &xattrs_setup.excl) : false;
}
/* Check whether the xattr with keyword KW should be discarded from list of
@@ -626,52 +613,50 @@ xattrs_kw_excluded (const char *kw, bool archiving)
static bool
xattrs_masked_out (const char *kw, bool archiving)
{
if (!xattrs_kw_included (kw, archiving))
return true;
return xattrs_kw_excluded (kw, archiving);
return xattrs_kw_included (kw, archiving) ?
xattrs_kw_excluded (kw, archiving) : true;
}
void
xattrs_xattrs_set (struct tar_stat_info const *st,
char const *file_name, char typeflag, int later_run)
char const *file_name, char typeflag, int later_run)
{
if (xattrs_option > 0)
{
#ifndef HAVE_XATTRS
static int done = 0;
if (!done)
WARN ((0, 0, _("XATTR support is not available")));
WARN ((0, 0, _("XATTR support is not available")));
done = 1;
#else
size_t scan = 0;
if (!st->xattr_map_size)
return;
return;
for (; scan < st->xattr_map_size; ++scan)
{
char *keyword = st->xattr_map[scan].xkey;
keyword += strlen ("SCHILY.xattr.");
{
char *keyword = st->xattr_map[scan].xkey;
keyword += strlen ("SCHILY.xattr.");
/* TODO: this 'later_run' workaround is temporary solution -> once
capabilities should become fully supported by it's API and there
should exist something like xattrs_capabilities_set() call.
For a regular files: all extended attributes are restored during
the first run except 'security.capability' which is restored in
'later_run == 1'. */
if (typeflag == REGTYPE
&& later_run == !!strcmp (keyword, "security.capability"))
continue;
/* TODO: this 'later_run' workaround is temporary solution -> once
capabilities should become fully supported by it's API and there
should exist something like xattrs_capabilities_set() call.
For a regular files: all extended attributes are restored during
the first run except 'security.capability' which is restored in
'later_run == 1'. */
if (typeflag == REGTYPE
&& later_run == !!strcmp (keyword, "security.capability"))
continue;
if (xattrs_masked_out (keyword, false /* extracting */ ))
/* we don't want to restore this keyword */
continue;
if (xattrs_masked_out (keyword, false /* extracting */ ))
/* we don't want to restore this keyword */
continue;
xattrs__fd_set (st, file_name, typeflag, keyword,
st->xattr_map[scan].xval_ptr,
st->xattr_map[scan].xval_len);
}
xattrs__fd_set (st, file_name, typeflag, keyword,
st->xattr_map[scan].xval_ptr,
st->xattr_map[scan].xval_len);
}
#endif
}
}
@@ -680,7 +665,7 @@ void
xattrs_print_char (struct tar_stat_info const *st, char *output)
{
int i;
if (verbose_option < 2)
{
*output = 0;
@@ -691,17 +676,18 @@ xattrs_print_char (struct tar_stat_info const *st, char *output)
{
/* placeholders */
*output = ' ';
*(output + 1) = 0;
output[1] = 0;
}
if (xattrs_option > 0 && st->xattr_map_size)
for (i = 0; i < st->xattr_map_size; ++i)
{
char *keyword = st->xattr_map[i].xkey + strlen ("SCHILY.xattr.");
if (xattrs_masked_out (keyword, false /* like extracting */ ))
continue;
*output = '*';
break;
char *keyword = st->xattr_map[i].xkey + strlen ("SCHILY.xattr.");
if (!xattrs_masked_out (keyword, false /* like extracting */ ))
{
*output = '*';
break;
}
}
if (selinux_context_option > 0 && st->cntx_name)
@@ -734,13 +720,13 @@ xattrs_print (struct tar_stat_info const *st)
if (xattrs_option && st->xattr_map_size)
{
int i;
for (i = 0; i < st->xattr_map_size; ++i)
{
char *keyword = st->xattr_map[i].xkey + strlen ("SCHILY.xattr.");
if (xattrs_masked_out (keyword, false /* like extracting */ ))
continue;
fprintf (stdlis, " x: %lu %s\n",
(unsigned long) st->xattr_map[i].xval_len, keyword);
}
{
char *keyword = st->xattr_map[i].xkey + strlen ("SCHILY.xattr.");
if (!xattrs_masked_out (keyword, false /* like extracting */ ))
fprintf (stdlis, " x: %lu %s\n",
(unsigned long) st->xattr_map[i].xval_len, keyword);
}
}
}