libburnia/libisofs
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
9f60c75f08
libisofs/libisofs/node.c
Thomas Schmitt 9f60c75f08 Introduced generic ACL-EA-system adapter aaip-os-dummy.c 
which steps in at compile time if neither __FreeBSD__ nor __linux is defined.
2009-01-29 10:52:08 +01:00

1865 lines
44 KiB
C
Raw Blame History

/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#include "libisofs.h"
#include "node.h"
#include "stream.h"
#ifdef Libisofs_with_aaiP
#include "aaip_0_2.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <stdio.h>
struct dir_iter_data
{
/* points to the last visited child, to NULL before start */
IsoNode *pos;
/* Some control flags.
* bit 0 -> 1 if next called, 0 reseted at start or on deletion
*/
int flag;
};
/**
* Increments the reference counting of the given node.
*/
void iso_node_ref(IsoNode *node)
{
++node->refcount;
}
/**
* Decrements the reference couting of the given node.
* If it reach 0, the node is free, and, if the node is a directory,
* its children will be unref() too.
*/
void iso_node_unref(IsoNode *node)
{
if (--node->refcount == 0) {
switch (node->type) {
case LIBISO_DIR:
{
IsoNode *child = ((IsoDir*)node)->children;
while (child != NULL) {
IsoNode *tmp = child->next;
child->parent = NULL;
iso_node_unref(child);
child = tmp;
}
}
break;
case LIBISO_FILE:
{
IsoFile *file = (IsoFile*) node;
iso_stream_unref(file->stream);
}
break;
case LIBISO_SYMLINK:
{
IsoSymlink *link = (IsoSymlink*) node;
free(link->dest);
}
default:
/* other kind of nodes does not need to delete anything here */
break;
}
if (node->xinfo) {
IsoExtendedInfo *info = node->xinfo;
while (info != NULL) {
IsoExtendedInfo *tmp = info->next;
/* free extended info */
info->process(info->data, 1);
free(info);
info = tmp;
}
}
free(node->name);
free(node);
}
}
/**
* Add extended information to the given node. Extended info allows
* applications (and libisofs itself) to add more information to an IsoNode.
* You can use this facilities to associate new information with a given
* node.
*
* Each node keeps a list of added extended info, meaning you can add several
* extended info data to each node. Each extended info you add is identified
* by the proc parameter, a pointer to a function that knows how to manage
* the external info data. Thus, in order to add several types of extended
* info, you need to define a "proc" function for each type.
*
* @param node
* The node where to add the extended info
* @param proc
* A function pointer used to identify the type of the data, and that
* knows how to manage it
* @param data
* Extended info to add.
* @return
* 1 if success, 0 if the given node already has extended info of the
* type defined by the "proc" function, < 0 on error
*/
int iso_node_add_xinfo(IsoNode *node, iso_node_xinfo_func proc, void *data)
{
IsoExtendedInfo *info;
IsoExtendedInfo *pos;
if (node == NULL || proc == NULL) {
return ISO_NULL_POINTER;
}
pos = node->xinfo;
while (pos != NULL) {
if (pos->process == proc) {
return 0; /* extended info already added */
}
pos = pos->next;
}
info = malloc(sizeof(IsoExtendedInfo));
if (info == NULL) {
return ISO_OUT_OF_MEM;
}
info->next = node->xinfo;
info->data = data;
info->process = proc;
node->xinfo = info;
return ISO_SUCCESS;
}
/**
* Remove the given extended info (defined by the proc function) from the
* given node.
*
* @return
* 1 on success, 0 if node does not have extended info of the requested
* type, < 0 on error
*/
int iso_node_remove_xinfo(IsoNode *node, iso_node_xinfo_func proc)
{
IsoExtendedInfo *pos, *prev;
if (node == NULL || proc == NULL) {
return ISO_NULL_POINTER;
}
prev = NULL;
pos = node->xinfo;
while (pos != NULL) {
if (pos->process == proc) {
/* this is the extended info we want to remove */
pos->process(pos->data, 1);
if (prev != NULL) {
prev->next = pos->next;
} else {
node->xinfo = pos->next;
}
free(pos);
return ISO_SUCCESS;
}
prev = pos;
pos = pos->next;
}
/* requested xinfo not found */
return 0;
}
/**
* Get the given extended info (defined by the proc function) from the
* given node.
*
* @param data
* Will be filled with the extended info corresponding to the given proc
* function
* @return
* 1 on success, 0 if node does not have extended info of the requested
* type, < 0 on error
*/
int iso_node_get_xinfo(IsoNode *node, iso_node_xinfo_func proc, void **data)
{
IsoExtendedInfo *pos;
if (node == NULL || proc == NULL || data == NULL) {
return ISO_NULL_POINTER;
}
pos = node->xinfo;
while (pos != NULL) {
if (pos->process == proc) {
/* this is the extended info we want */
*data = pos->data;
return ISO_SUCCESS;
}
pos = pos->next;
}
/* requested xinfo not found */
return 0;
}
/**
* Get the type of an IsoNode.
*/
enum IsoNodeType iso_node_get_type(IsoNode *node)
{
return node->type;
}
/**
* Set the name of a node.
*
* @param name The name in UTF-8 encoding
*/
int iso_node_set_name(IsoNode *node, const char *name)
{
char *new;
if ((IsoNode*)node->parent == node) {
/* you can't change name of the root node */
return ISO_WRONG_ARG_VALUE;
}
/* check if the name is valid */
if (!iso_node_is_valid_name(name)) {
return ISO_WRONG_ARG_VALUE;
}
if (node->parent != NULL) {
/* check if parent already has a node with same name */
if (iso_dir_get_node(node->parent, name, NULL) == 1) {
return ISO_NODE_NAME_NOT_UNIQUE;
}
}
new = strdup(name);
if (new == NULL) {
return ISO_OUT_OF_MEM;
}
free(node->name);
node->name = new;
if (node->parent != NULL) {
IsoDir *parent;
int res;
/* take and add again to ensure correct children order */
parent = node->parent;
iso_node_take(node);
res = iso_dir_add_node(parent, node, 0);
if (res < 0) {
return res;
}
}
return ISO_SUCCESS;
}
/**
* Get the name of a node (in UTF-8).
* The returned string belongs to the node and should not be modified nor
* freed. Use strdup if you really need your own copy.
*/
const char *iso_node_get_name(const IsoNode *node)
{
return node->name;
}
/* ta A90128 */
/**
* See API function iso_node_set_permissions()
*
* @param flag bit0= do not adjust ACL
* @return >0 success , <0 error
*/
static
int iso_node_set_perms_internal(IsoNode *node, mode_t mode, int flag)
{
int ret;
node->mode = (node->mode & S_IFMT) | (mode & ~S_IFMT);
#ifdef Libisofs_with_aaiP
/* ts A90119 */
/* If the node has ACL info : update ACL */
ret = 1;
if (!(flag & 1))
ret = iso_node_set_acl_text(node, "", 2);
return ret;
#endif
}
/**
* Set the permissions for the node. This attribute is only useful when
* Rock Ridge extensions are enabled.
*
* @param mode
* bitmask with the permissions of the node, as specified in 'man 2 stat'.
* The file type bitfields will be ignored, only file permissions will be
* modified.
*/
void iso_node_set_permissions(IsoNode *node, mode_t mode)
{
iso_node_set_perms_internal(node, mode, 0);
}
/**
* Get the permissions for the node
*/
mode_t iso_node_get_permissions(const IsoNode *node)
{
return node->mode & ~S_IFMT;
}
/**
* Get the mode of the node, both permissions and file type, as specified in
* 'man 2 stat'.
*/
mode_t iso_node_get_mode(const IsoNode *node)
{
return node->mode;
}
/**
* Set the user id for the node. This attribute is only useful when
* Rock Ridge extensions are enabled.
*/
void iso_node_set_uid(IsoNode *node, uid_t uid)
{
node->uid = uid;
}
/**
* Get the user id of the node.
*/
uid_t iso_node_get_uid(const IsoNode *node)
{
return node->uid;
}
/**
* Set the group id for the node. This attribute is only useful when
* Rock Ridge extensions are enabled.
*/
void iso_node_set_gid(IsoNode *node, gid_t gid)
{
node->gid = gid;
}
/**
* Get the group id of the node.
*/
gid_t iso_node_get_gid(const IsoNode *node)
{
return node->gid;
}
/**
* Set the time of last modification of the file
*/
void iso_node_set_mtime(IsoNode *node, time_t time)
{
node->mtime = time;
}
/**
* Get the time of last modification of the file
*/
time_t iso_node_get_mtime(const IsoNode *node)
{
return node->mtime;
}
/**
* Set the time of last access to the file
*/
void iso_node_set_atime(IsoNode *node, time_t time)
{
node->atime = time;
}
/**
* Get the time of last access to the file
*/
time_t iso_node_get_atime(const IsoNode *node)
{
return node->atime;
}
/**
* Set the time of last status change of the file
*/
void iso_node_set_ctime(IsoNode *node, time_t time)
{
node->ctime = time;
}
/**
* Get the time of last status change of the file
*/
time_t iso_node_get_ctime(const IsoNode *node)
{
return node->ctime;
}
void iso_node_set_hidden(IsoNode *node, int hide_attrs)
{
/* you can't hide root node */
if ((IsoNode*)node->parent != node) {
node->hidden = hide_attrs;
}
}
/**
* Add a new node to a dir. Note that this function don't add a new ref to
* the node, so you don't need to free it, it will be automatically freed
* when the dir is deleted. Of course, if you want to keep using the node
* after the dir life, you need to iso_node_ref() it.
*
* @param dir
* the dir where to add the node
* @param child
* the node to add. You must ensure that the node hasn't previously added
* to other dir, and that the node name is unique inside the child.
* Otherwise this function will return a failure, and the child won't be
* inserted.
* @param replace
* if the dir already contains a node with the same name, whether to
* replace or not the old node with this.
* @return
* number of nodes in dir if succes, < 0 otherwise
*/
int iso_dir_add_node(IsoDir *dir, IsoNode *child,
enum iso_replace_mode replace)
{
IsoNode **pos;
if (dir == NULL || child == NULL) {
return ISO_NULL_POINTER;
}
if ((IsoNode*)dir == child) {
return ISO_WRONG_ARG_VALUE;
}
/*
* check if child is already added to another dir, or if child
* is the root node, where parent == itself
*/
if (child->parent != NULL || child->parent == (IsoDir*)child) {
return ISO_NODE_ALREADY_ADDED;
}
iso_dir_find(dir, child->name, &pos);
return iso_dir_insert(dir, child, pos, replace);
}
/**
* Locate a node inside a given dir.
*
* @param name
* The name of the node
* @param node
* Location for a pointer to the node, it will filled with NULL if the dir
* doesn't have a child with the given name.
* The node will be owned by the dir and shouldn't be unref(). Just call
* iso_node_ref() to get your own reference to the node.
* Note that you can pass NULL is the only thing you want to do is check
* if a node with such name already exists on dir.
* @return
* 1 node found, 0 child has no such node, < 0 error
* Possible errors:
* ISO_NULL_POINTER, if dir or name are NULL
*/
int iso_dir_get_node(IsoDir *dir, const char *name, IsoNode **node)
{
int ret;
IsoNode **pos;
if (dir == NULL || name == NULL) {
return ISO_NULL_POINTER;
}
ret = iso_dir_exists(dir, name, &pos);
if (ret == 0) {
if (node) {
*node = NULL;
}
return 0; /* node not found */
}
if (node) {
*node = *pos;
}
return 1;
}
/**
* Get the number of children of a directory.
*
* @return
* >= 0 number of items, < 0 error
* Possible errors:
* ISO_NULL_POINTER, if dir is NULL
*/
int iso_dir_get_children_count(IsoDir *dir)
{
if (dir == NULL) {
return ISO_NULL_POINTER;
}
return dir->nchildren;
}
static
int iter_next(IsoDirIter *iter, IsoNode **node)
{
struct dir_iter_data *data;
if (iter == NULL || node == NULL) {
return ISO_NULL_POINTER;
}
data = iter->data;
/* clear next flag */
data->flag &= ~0x01;
if (data->pos == NULL) {
/* we are at the beginning */
data->pos = iter->dir->children;
if (data->pos == NULL) {
/* empty dir */
*node = NULL;
return 0;
}
} else {
if (data->pos->parent != iter->dir) {
/* this can happen if the node has been moved to another dir */
/* TODO specific error */
return ISO_ERROR;
}
if (data->pos->next == NULL) {
/* no more children */
*node = NULL;
return 0;
} else {
/* free reference to current position */
iso_node_unref(data->pos); /* it is never last ref!! */
/* advance a position */
data->pos = data->pos->next;
}
}
/* ok, take a ref to the current position, to prevent internal errors
* if deleted somewhere */
iso_node_ref(data->pos);
data->flag |= 0x01; /* set next flag */
/* return pointed node */
*node = data->pos;
return ISO_SUCCESS;
}
/**
* Check if there're more children.
*
* @return
* 1 dir has more elements, 0 no, < 0 error
* Possible errors:
* ISO_NULL_POINTER, if iter is NULL
*/
static
int iter_has_next(IsoDirIter *iter)
{
struct dir_iter_data *data;
if (iter == NULL) {
return ISO_NULL_POINTER;
}
data = iter->data;
if (data->pos == NULL) {
return iter->dir->children == NULL ? 0 : 1;
} else {
return data->pos->next == NULL ? 0 : 1;
}
}
static
void iter_free(IsoDirIter *iter)
{
struct dir_iter_data *data;
data = iter->data;
if (data->pos != NULL) {
iso_node_unref(data->pos);
}
free(data);
}
static IsoNode** iso_dir_find_node(IsoDir *dir, IsoNode *node)
{
IsoNode **pos;
pos = &(dir->children);
while (*pos != NULL && *pos != node) {
pos = &((*pos)->next);
}
return pos;
}
/**
* Removes a child from a directory.
* The child is not freed, so you will become the owner of the node. Later
* you can add the node to another dir (calling iso_dir_add_node), or free
* it if you don't need it (with iso_node_unref).
*
* @return
* 1 on success, < 0 error
*/
int iso_node_take(IsoNode *node)
{
IsoNode **pos;
IsoDir* dir;
if (node == NULL) {
return ISO_NULL_POINTER;
}
dir = node->parent;
if (dir == NULL) {
return ISO_NODE_NOT_ADDED_TO_DIR;
}
pos = iso_dir_find_node(dir, node);
if (pos == NULL) {
/* should never occur */
return ISO_ASSERT_FAILURE;
}
/* notify iterators just before remove */
iso_notify_dir_iters(node, 0);
*pos = node->next;
node->parent = NULL;
node->next = NULL;
dir->nchildren--;
return ISO_SUCCESS;
}
/**
* Removes a child from a directory and free (unref) it.
* If you want to keep the child alive, you need to iso_node_ref() it
* before this call, but in that case iso_node_take() is a better
* alternative.
*
* @return
* 1 on success, < 0 error
*/
int iso_node_remove(IsoNode *node)
{
int ret;
ret = iso_node_take(node);
if (ret == ISO_SUCCESS) {
iso_node_unref(node);
}
return ret;
}
/*
* Get the parent of the given iso tree node. No extra ref is added to the
* returned directory, you must take your ref. with iso_node_ref() if you
* need it.
*
* If node is the root node, the same node will be returned as its parent.
*
* This returns NULL if the node doesn't pertain to any tree
* (it was removed/take).
*/
IsoDir *iso_node_get_parent(IsoNode *node)
{
return node->parent;
}
/* TODO #00005 optimize iso_dir_iter_take */
static
int iter_take(IsoDirIter *iter)
{
struct dir_iter_data *data;
if (iter == NULL) {
return ISO_NULL_POINTER;
}
data = iter->data;
if (!(data->flag & 0x01)) {
return ISO_ERROR; /* next not called or end of dir */
}
if (data->pos == NULL) {
return ISO_ASSERT_FAILURE;
}
/* clear next flag */
data->flag &= ~0x01;
return iso_node_take(data->pos);
}
static
int iter_remove(IsoDirIter *iter)
{
int ret;
IsoNode *pos;
struct dir_iter_data *data;
if (iter == NULL) {
return ISO_NULL_POINTER;
}
data = iter->data;
pos = data->pos;
ret = iter_take(iter);
if (ret == ISO_SUCCESS) {
/* remove node */
iso_node_unref(pos);
}
return ret;
}
void iter_notify_child_taken(IsoDirIter *iter, IsoNode *node)
{
IsoNode *pos, *pre;
struct dir_iter_data *data;
data = iter->data;
if (data->pos == node) {
pos = iter->dir->children;
pre = NULL;
while (pos != NULL && pos != data->pos) {
pre = pos;
pos = pos->next;
}
if (pos == NULL || pos != data->pos) {
return;
}
/* dispose iterator reference */
iso_node_unref(data->pos);
if (pre == NULL) {
/* node is a first position */
iter->dir->children = pos->next;
data->pos = NULL;
} else {
pre->next = pos->next;
data->pos = pre;
iso_node_ref(pre); /* take iter ref */
}
}
}
static
struct iso_dir_iter_iface iter_class = {
iter_next,
iter_has_next,
iter_free,
iter_take,
iter_remove,
iter_notify_child_taken
};
int iso_dir_get_children(const IsoDir *dir, IsoDirIter **iter)
{
IsoDirIter *it;
struct dir_iter_data *data;
if (dir == NULL || iter == NULL) {
return ISO_NULL_POINTER;
}
it = malloc(sizeof(IsoDirIter));
if (it == NULL) {
return ISO_OUT_OF_MEM;
}
data = malloc(sizeof(struct dir_iter_data));
if (data == NULL) {
free(it);
return ISO_OUT_OF_MEM;
}
it->class = &iter_class;
it->dir = (IsoDir*)dir;
data->pos = NULL;
data->flag = 0x00;
it->data = data;
if (iso_dir_iter_register(it) < 0) {
free(it);
return ISO_OUT_OF_MEM;
}
iso_node_ref((IsoNode*)dir); /* tak a ref to the dir */
*iter = it;
return ISO_SUCCESS;
}
int iso_dir_iter_next(IsoDirIter *iter, IsoNode **node)
{
if (iter == NULL || node == NULL) {
return ISO_NULL_POINTER;
}
return iter->class->next(iter, node);
}
int iso_dir_iter_has_next(IsoDirIter *iter)
{
if (iter == NULL) {
return ISO_NULL_POINTER;
}
return iter->class->has_next(iter);
}
void iso_dir_iter_free(IsoDirIter *iter)
{
if (iter != NULL) {
iso_dir_iter_unregister(iter);
iter->class->free(iter);
iso_node_unref((IsoNode*)iter->dir);
free(iter);
}
}
int iso_dir_iter_take(IsoDirIter *iter)
{
if (iter == NULL) {
return ISO_NULL_POINTER;
}
return iter->class->take(iter);
}
int iso_dir_iter_remove(IsoDirIter *iter)
{
if (iter == NULL) {
return ISO_NULL_POINTER;
}
return iter->class->remove(iter);
}
/**
* Get the destination of a node.
* The returned string belongs to the node and should not be modified nor
* freed. Use strdup if you really need your own copy.
*/
const char *iso_symlink_get_dest(const IsoSymlink *link)
{
return link->dest;
}
/**
* Set the destination of a link.
*/
int iso_symlink_set_dest(IsoSymlink *link, const char *dest)
{
char *d;
if (!iso_node_is_valid_link_dest(dest)) {
/* guard against null or empty dest */
return ISO_WRONG_ARG_VALUE;
}
d = strdup(dest);
if (d == NULL) {
return ISO_OUT_OF_MEM;
}
free(link->dest);
link->dest = d;
return ISO_SUCCESS;
}
/**
* Sets the order in which a node will be written on image. High weihted files
* will be written first, so in a disc them will be written near the center.
*
* @param node
* The node which weight will be changed. If it's a dir, this function
* will change the weight of all its children. For nodes other that dirs
* or regular files, this function has no effect.
* @param w
* The weight as a integer number, the greater this value is, the
* closer from the begining of image the file will be written.
*/
void iso_node_set_sort_weight(IsoNode *node, int w)
{
if (node->type == LIBISO_DIR) {
IsoNode *child = ((IsoDir*)node)->children;
while (child) {
iso_node_set_sort_weight(child, w);
child = child->next;
}
} else if (node->type == LIBISO_FILE) {
((IsoFile*)node)->sort_weight = w;
}
}
/**
* Get the sort weight of a file.
*/
int iso_file_get_sort_weight(IsoFile *file)
{
return file->sort_weight;
}
/**
* Get the size of the file, in bytes
*/
off_t iso_file_get_size(IsoFile *file)
{
return iso_stream_get_size(file->stream);
}
/**
* Get the IsoStream that represents the contents of the given IsoFile.
*
* If you open() the stream, it should be close() before image generation.
*
* @return
* The IsoStream. No extra ref is added, so the IsoStream belong to the
* IsoFile, and it may be freed together with it. Add your own ref with
* iso_stream_ref() if you need it.
*
* @since 0.6.4
*/
IsoStream *iso_file_get_stream(IsoFile *file)
{
return file->stream;
}
/**
* Get the device id (major/minor numbers) of the given block or
* character device file. The result is undefined for other kind
* of special files, of first be sure iso_node_get_mode() returns either
* S_IFBLK or S_IFCHR.
*
* @since 0.6.6
*/
dev_t iso_special_get_dev(IsoSpecial *special)
{
return special->dev;
}
/**
* Get the block lba of a file node, if it was imported from an old image.
*
* @param file
* The file
* @param lba
* Will be filled with the kba
* @param flag
* Reserved for future usage, submit 0
* @return
* 1 if lba is valid (file comes from old image), 0 if file was newly
* added, i.e. it does not come from an old image, < 0 error
*
* @since 0.6.4
*/
int iso_file_get_old_image_lba(IsoFile *file, uint32_t *lba, int flag)
{
int ret;
int section_count;
struct iso_file_section *sections;
if (file == NULL || lba == NULL) {
return ISO_NULL_POINTER;
}
ret = iso_file_get_old_image_sections(file, &section_count, &sections, flag);
if (ret <= 0) {
return ret;
}
if (section_count != 1) {
free(sections);
return ISO_WRONG_ARG_VALUE;
}
*lba = sections[0].block;
free(sections);
return 0;
}
/*
* Like iso_file_get_old_image_lba(), but take an IsoNode.
*
* @return
* 1 if lba is valid (file comes from old image), 0 if file was newly
* added, i.e. it does not come from an old image, 2 node type has no
* LBA (no regular file), < 0 error
*
* @since 0.6.4
*/
int iso_node_get_old_image_lba(IsoNode *node, uint32_t *lba, int flag)
{
if (node == NULL) {
return ISO_NULL_POINTER;
}
if (ISO_NODE_IS_FILE(node)) {
return iso_file_get_old_image_lba((IsoFile*)node, lba, flag);
} else {
return 2;
}
}
/**
* Check if a given name is valid for an iso node.
*
* @return
* 1 if yes, 0 if not
*/
int iso_node_is_valid_name(const char *name)
{
/* a name can't be NULL */
if (name == NULL) {
return 0;
}
/* guard against the empty string or big names... */
if (name[0] == '\0' || strlen(name) > 255) {
return 0;
}
/* ...against "." and ".." names... */
if (!strcmp(name, ".") || !strcmp(name, "..")) {
return 0;
}
/* ...and against names with '/' */
if (strchr(name, '/') != NULL) {
return 0;
}
return 1;
}
/**
* Check if a given path is valid for the destination of a link.
*
* @return
* 1 if yes, 0 if not
*/
int iso_node_is_valid_link_dest(const char *dest)
{
int ret;
char *ptr, *brk_info, *component;
/* a dest can't be NULL */
if (dest == NULL) {
return 0;
}
/* guard against the empty string or big dest... */
if (dest[0] == '\0' || strlen(dest) > PATH_MAX) {
return 0;
}
/* check that all components are valid */
if (!strcmp(dest, "/")) {
/* "/" is a valid component */
return 1;
}
ptr = strdup(dest);
if (ptr == NULL) {
return 0;
}
ret = 1;
component = strtok_r(ptr, "/", &brk_info);
while (component) {
if (strcmp(component, ".") && strcmp(component, "..")) {
ret = iso_node_is_valid_name(component);
if (ret == 0) {
break;
}
}
component = strtok_r(NULL, "/", &brk_info);
}
free(ptr);
return ret;
}
void iso_dir_find(IsoDir *dir, const char *name, IsoNode ***pos)
{
*pos = &(dir->children);
while (**pos != NULL && strcmp((**pos)->name, name) < 0) {
*pos = &((**pos)->next);
}
}
int iso_dir_exists(IsoDir *dir, const char *name, IsoNode ***pos)
{
IsoNode **node;
iso_dir_find(dir, name, &node);
if (pos) {
*pos = node;
}
return (*node != NULL && !strcmp((*node)->name, name)) ? 1 : 0;
}
int iso_dir_insert(IsoDir *dir, IsoNode *node, IsoNode **pos,
enum iso_replace_mode replace)
{
if (*pos != NULL && !strcmp((*pos)->name, node->name)) {
/* a node with same name already exists */
switch(replace) {
case ISO_REPLACE_NEVER:
return ISO_NODE_NAME_NOT_UNIQUE;
case ISO_REPLACE_IF_NEWER:
if ((*pos)->mtime >= node->mtime) {
/* old file is newer */
return ISO_NODE_NAME_NOT_UNIQUE;
}
break;
case ISO_REPLACE_IF_SAME_TYPE_AND_NEWER:
if ((*pos)->mtime >= node->mtime) {
/* old file is newer */
return ISO_NODE_NAME_NOT_UNIQUE;
}
/* fall down */
case ISO_REPLACE_IF_SAME_TYPE:
if ((node->mode & S_IFMT) != ((*pos)->mode & S_IFMT)) {
/* different file types */
return ISO_NODE_NAME_NOT_UNIQUE;
}
break;
case ISO_REPLACE_ALWAYS:
break;
default:
/* CAN'T HAPPEN */
return ISO_ASSERT_FAILURE;
}
/* if we are reach here we have to replace */
node->next = (*pos)->next;
(*pos)->parent = NULL;
(*pos)->next = NULL;
iso_node_unref(*pos);
*pos = node;
node->parent = dir;
return dir->nchildren;
}
node->next = *pos;
*pos = node;
node->parent = dir;
return ++dir->nchildren;
}
/* iterators are stored in a linked list */
struct iter_reg_node {
IsoDirIter *iter;
struct iter_reg_node *next;
};
/* list header */
static
struct iter_reg_node *iter_reg = NULL;
/**
* Add a new iterator to the registry. The iterator register keeps track of
* all iterators being used, and are notified when directory structure
* changes.
*/
int iso_dir_iter_register(IsoDirIter *iter)
{
struct iter_reg_node *new;
new = malloc(sizeof(struct iter_reg_node));
if (new == NULL) {
return ISO_OUT_OF_MEM;
}
new->iter = iter;
new->next = iter_reg;
iter_reg = new;
return ISO_SUCCESS;
}
/**
* Unregister a directory iterator.
*/
void iso_dir_iter_unregister(IsoDirIter *iter)
{
struct iter_reg_node **pos;
pos = &iter_reg;
while (*pos != NULL && (*pos)->iter != iter) {
pos = &(*pos)->next;
}
if (*pos) {
struct iter_reg_node *tmp = (*pos)->next;
free(*pos);
*pos = tmp;
}
}
void iso_notify_dir_iters(IsoNode *node, int flag)
{
struct iter_reg_node *pos = iter_reg;
while (pos != NULL) {
IsoDirIter *iter = pos->iter;
if (iter->dir == node->parent) {
iter->class->notify_child_taken(iter, node);
}
pos = pos->next;
}
}
int iso_node_new_root(IsoDir **root)
{
IsoDir *dir;
dir = calloc(1, sizeof(IsoDir));
if (dir == NULL) {
return ISO_OUT_OF_MEM;
}
dir->node.refcount = 1;
dir->node.type = LIBISO_DIR;
dir->node.atime = dir->node.ctime = dir->node.mtime = time(NULL);
dir->node.mode = S_IFDIR | 0555;
/* set parent to itself, to prevent root to be added to another dir */
dir->node.parent = dir;
*root = dir;
return ISO_SUCCESS;
}
int iso_node_new_dir(char *name, IsoDir **dir)
{
IsoDir *new;
if (dir == NULL || name == NULL) {
return ISO_NULL_POINTER;
}
/* check if the name is valid */
if (!iso_node_is_valid_name(name)) {
return ISO_WRONG_ARG_VALUE;
}
new = calloc(1, sizeof(IsoDir));
if (new == NULL) {
return ISO_OUT_OF_MEM;
}
new->node.refcount = 1;
new->node.type = LIBISO_DIR;
new->node.name = name;
new->node.mode = S_IFDIR;
*dir = new;
return ISO_SUCCESS;
}
int iso_node_new_file(char *name, IsoStream *stream, IsoFile **file)
{
IsoFile *new;
if (file == NULL || name == NULL || stream == NULL) {
return ISO_NULL_POINTER;
}
/* check if the name is valid */
if (!iso_node_is_valid_name(name)) {
return ISO_WRONG_ARG_VALUE;
}
new = calloc(1, sizeof(IsoFile));
if (new == NULL) {
return ISO_OUT_OF_MEM;
}
new->node.refcount = 1;
new->node.type = LIBISO_FILE;
new->node.name = name;
new->node.mode = S_IFREG;
new->stream = stream;
*file = new;
return ISO_SUCCESS;
}
int iso_node_new_symlink(char *name, char *dest, IsoSymlink **link)
{
IsoSymlink *new;
if (link == NULL || name == NULL || dest == NULL) {
return ISO_NULL_POINTER;
}
/* check if the name is valid */
if (!iso_node_is_valid_name(name)) {
return ISO_WRONG_ARG_VALUE;
}
/* check if destination is valid */
if (!iso_node_is_valid_link_dest(dest)) {
/* guard against null or empty dest */
return ISO_WRONG_ARG_VALUE;
}
new = calloc(1, sizeof(IsoSymlink));
if (new == NULL) {
return ISO_OUT_OF_MEM;
}
new->node.refcount = 1;
new->node.type = LIBISO_SYMLINK;
new->node.name = name;
new->dest = dest;
new->node.mode = S_IFLNK;
*link = new;
return ISO_SUCCESS;
}
int iso_node_new_special(char *name, mode_t mode, dev_t dev,
IsoSpecial **special)
{
IsoSpecial *new;
if (special == NULL || name == NULL) {
return ISO_NULL_POINTER;
}
if (S_ISLNK(mode) || S_ISREG(mode) || S_ISDIR(mode)) {
return ISO_WRONG_ARG_VALUE;
}
/* check if the name is valid */
if (!iso_node_is_valid_name(name)) {
return ISO_WRONG_ARG_VALUE;
}
new = calloc(1, sizeof(IsoSpecial));
if (new == NULL) {
return ISO_OUT_OF_MEM;
}
new->node.refcount = 1;
new->node.type = LIBISO_SPECIAL;
new->node.name = name;
new->node.mode = mode;
new->dev = dev;
*special = new;
return ISO_SUCCESS;
}
/* ts A90116 */
/* >>> describe
@param flag bit15 = free memory
*/
int iso_node_get_attrs(IsoNode *node, size_t *num_attrs,
char ***names, size_t **value_lengths, char ***values, int flag)
{
#ifdef Libisofs_with_aaiP
void *xipt;
struct aaip_state *aaip= NULL;
unsigned char *rpt, *aa_string;
size_t len, todo, consumed;
int is_done = 0, first_round= 1, ret;
if (flag & (1 << 15))
aaip_get_decoded_attrs(&aaip, num_attrs, names,
value_lengths, values, 1 << 15);
*num_attrs = 0;
*names = NULL;
*value_lengths = NULL;
*values = NULL;
if (flag & (1 << 15))
return 1;
ret = iso_node_get_xinfo(node, aaip_xinfo_func, &xipt);
if (ret != 1)
return 1;
aa_string = rpt = (unsigned char *) xipt;
len = aaip_count_bytes(rpt, 0);
while (!is_done) {
todo = len - (rpt - aa_string);
if (todo > 2048)
todo = 2048;
if (todo == 0) {
/* >>> Out of data while still prompted to submit */;
/* >>> invent better error code */
return ISO_ERROR;
}
/* Allow 1 million bytes of memory consumption, 100,000 attributes */
ret = aaip_decode_attrs(&aaip, "AA", (size_t) 1000000, (size_t) 100000,
rpt, todo, &consumed, first_round);
rpt+= consumed;
first_round= 0;
if (ret == 1)
continue;
if (ret == 2)
break;
/* >>> "aaip_decode_attrs() reports error */;
/* >>> invent better error code */
return ISO_ERROR;
}
if(rpt - aa_string != len) {
/* >>> "aaip_decode_attrs() returns 2 but still bytes are left" */
/* >>> invent better error code */
return ISO_ERROR;
}
ret = aaip_get_decoded_attrs(&aaip, num_attrs, names,
value_lengths, values, 0);
if(ret != 1) {
/* >>> aaip_get_decoded_attrs() failed */;
return ISO_OUT_OF_MEM;
}
#else /* Libisofs_with_aaiP */
*num_attrs = 0;
*names = NULL;
*value_lengths = NULL;
*values = NULL;
#endif /* ! Libisofs_with_aaiP */
return 1;
}
/* ts A90121 */
int iso_node_set_attrs(IsoNode *node, size_t num_attrs, char **names,
size_t *value_lengths, char **values, int flag)
{
#ifdef Libisofs_with_aaiP
int ret;
size_t sret, result_len;
unsigned char *result;
if (num_attrs == 0) {
ret = iso_node_remove_xinfo(node, aaip_xinfo_func);
if (ret < 0)
return ret;
return 1;
}
sret = aaip_encode("AA", num_attrs, names, value_lengths, values,
&result_len, &result, 0);
if (sret == 0)
return ISO_OUT_OF_MEM;
ret = iso_node_remove_xinfo(node, aaip_xinfo_func);
if (ret < 0)
return ret;
ret = iso_node_add_xinfo(node, aaip_xinfo_func, result);
if (ret < 0)
return ret;
if (ret == 0) {
/* >>> something is messed up with xinfo */;
return ISO_ERROR;
}
return 1;
#else /* Libisofs_with_aaiP */
/* >>> no support for attributes */
return ISO_ERROR;
#endif /* ! Libisofs_with_aaiP */
}
#ifdef Libisofs_with_aaiP
static
int iso_decode_acl(unsigned char *v_data, size_t v_len, size_t *consumed,
char **text, size_t *text_fill, int flag)
{
int ret;
*text= NULL;
ret = aaip_decode_acl(v_data, v_len,
consumed, NULL, (size_t) 0, text_fill, 1);
if (ret <= 0)
return 0;
if (*text_fill == 0)
return ret;
*text = calloc(*text_fill + 42, 1); /* 42 for aaip_update_acl_st_mode */
if (*text == NULL)
return ISO_OUT_OF_MEM;
ret = aaip_decode_acl(v_data, v_len,
consumed, *text, *text_fill, text_fill, 0);
if (ret <= 0) {
free(*text);
*text= NULL;
return 0;
}
return ret;
}
#endif /* ! Libisofs_with_aaiP */
/* ts A90116 */
int iso_node_get_acl_text(IsoNode *node, char **text, int flag)
{
#ifdef Libisofs_with_aaiP
size_t num_attrs = 0, *value_lengths = NULL, i, consumed, text_fill = 0;
size_t v_len;
char **names = NULL, **values = NULL;
unsigned char *v_data;
int ret, from_posix= 0;
mode_t st_mode;
if (flag & (1 << 15)) {
if (*text != NULL)
free(*text);
*text = NULL;
return 1;
}
*text = NULL;
ret = iso_node_get_attrs(node, &num_attrs, &names,
&value_lengths, &values, 0);
if (ret < 0)
return ret;
for(i = 0; i < num_attrs; i++) {
if (names[i][0]) /* searching the empty name */
continue;
v_data = (unsigned char *) values[i];
v_len = value_lengths[i];
if (flag & 1) {
/* Skip "access" ACL and address "default" ACL instead */
ret = aaip_decode_acl(v_data, v_len,
&consumed, NULL, (size_t) 0, &text_fill, 1);
if (ret <= 0)
goto bad_decode;
if (ret != 2) {
ret = 0;
goto ex;
}
v_data += consumed;
v_len -= consumed;
}
ret = iso_decode_acl(v_data, v_len, &consumed, text, &text_fill, 0);
if (ret == 0)
goto bad_decode;
if (ret < 0)
goto ex;
break;
}
if (*text == NULL && !(flag & 16)) {
from_posix = 1;
*text = calloc(42, 1); /* 42 for aaip_update_acl_st_mode */
}
if (*text != NULL) {
st_mode = iso_node_get_permissions(node);
aaip_add_acl_st_mode(*text, st_mode, 0);
text_fill = strlen(*text);
}
if (text == NULL)
ret = 0;
else
ret = 1 + from_posix;
ex:;
iso_node_get_attrs(node, &num_attrs, &names,
&value_lengths, &values, 1 << 15); /* free memory */
return ret;
bad_decode:;
/* >>> something is wrong with the attribute value */;
/* >>> invent better error code */
ret = ISO_ERROR;
goto ex;
#else /* Libisofs_with_aaiP */
*text = NULL;
return 0;
#endif /* ! Libisofs_with_aaiP */
}
/* ts A90119 */
int iso_node_set_acl_text(IsoNode *node, char *acl_text, int flag)
{
#ifdef Libisofs_with_aaiP
size_t num_attrs = 0, *value_lengths = NULL, i, j, consumed;
size_t a_text_fill = 0, d_text_fill = 0;
size_t v_len, acl_len= 0;
char **names = NULL, **values = NULL, *a_text = NULL, *d_text = NULL;
char **new_names, **new_values;
size_t *new_value_lengths;
char **tpt;
unsigned char *v_data, *acl= NULL;
int ret;
mode_t st_mode;
st_mode = iso_node_get_permissions(node);
if (!(flag & 2)) { /* want not to update ACL by st_mode */
/* >>> validate and rectify text */;
}
ret = iso_node_get_attrs(node, &num_attrs, &names,
&value_lengths, &values, 0);
if (ret < 0)
return ret;
for(i = 0; i < num_attrs; i++) {
if (names[i][0]) /* searching the empty name */
continue;
v_data = (unsigned char *) values[i];
v_len = value_lengths[i];
/* "access" ACL */;
ret = iso_decode_acl(v_data, v_len, &consumed, &a_text, &a_text_fill,
0);
if (ret == 0)
goto bad_decode;
if (ret < 0)
goto ex;
if (ret == 2) {
/* "default" ACL */;
v_data += consumed;
v_len -= consumed;
ret = iso_decode_acl(v_data, v_len, &consumed, &d_text,
&d_text_fill, 0);
if (ret == 0)
goto bad_decode;
if (ret < 0)
goto ex;
}
if (flag & 2) {
/* Update "access" ACL by st_mode */
if (a_text == NULL) {
ret = 1;
goto ex;
}
ret = aaip_cleanout_st_mode(a_text, &st_mode, 8);
if (ret < 0)
goto bad_decode;
} else {
if (flag & 1)
tpt = &d_text;
else
tpt = &a_text;
if (*tpt != NULL) {
free(*tpt);
*tpt = NULL;
}
if (acl_text != NULL) {
*tpt = calloc(strlen(acl_text) + 1, 1);
if (*tpt == NULL) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
memcpy(*tpt, acl_text, strlen(acl_text));
}
}
if (a_text != NULL || d_text != NULL)
ret = aaip_encode_both_acl(a_text, d_text, st_mode, &acl_len, &acl,
2 | 8);
else
ret = 1;
if (ret <= 0) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
/* replace variable value */;
if (values[i] != NULL)
free(values[i]);
if(acl == NULL) { /* delete whole ACL attribute */
for (j = i + 1; j < num_attrs; j++) {
names[j - 1] = names[j];
value_lengths[j - 1] = value_lengths[j];
values[j - 1] = values[j];
}
num_attrs--;
} else {
values[i] = (char *) acl;
acl = NULL;
value_lengths[i] = acl_len;
}
/* Encode attributes and attach to node */
ret = iso_node_set_attrs(node, num_attrs, names, value_lengths, values,
0);
if (ret <= 0)
goto ex;
goto update_perms;
}
/* There is no ACL yet */
if ((flag & 2) || acl_text == NULL) {
/* thus no need to update ACL by st_mode or to delete ACL */
ret = 1;
goto ex;
}
if (flag & 1)
ret = aaip_encode_both_acl(NULL, acl_text,
st_mode, &acl_len, &acl, 2 | 8);
else
ret = aaip_encode_both_acl(acl_text, NULL,
st_mode, &acl_len, &acl, 2 | 8);
if (ret <= 0) {
/* >>> cannot encode */;
ret = ISO_ERROR;
goto ex;
}
/* Enlarge attribute list */
new_names = realloc(names, (num_attrs + 1) * sizeof(char *));
if (new_names == NULL) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
names = new_names;
new_values = realloc(values, (num_attrs + 1) * sizeof(char *));
if (new_values == NULL) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
values = new_values;
new_value_lengths = realloc(value_lengths,
(num_attrs + 1) * sizeof(size_t));
if (new_value_lengths == NULL) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
value_lengths = new_value_lengths;
/* Set new ACL attribute */
names[num_attrs] = strdup("");
if (names[num_attrs] == NULL) {
ret = ISO_OUT_OF_MEM;
goto ex;
}
values[num_attrs] = (char *) acl;
acl = NULL;
value_lengths[num_attrs] = acl_len;
num_attrs++;
/* Encode attributes and attach to node */
ret = iso_node_set_attrs(node, num_attrs, names, value_lengths, values, 0);
if (ret < 0)
goto ex;
update_perms:;
if(acl_text != NULL && !(flag & (1 | 2))) {
/* Update node permissions by acl_text */
st_mode = iso_node_get_permissions(node);
ret = aaip_cleanout_st_mode(acl_text, &st_mode, 4);
if (ret < 0)
goto bad_decode;
iso_node_set_perms_internal(node, st_mode, 1);
}
ret = 1;
ex:;
iso_node_get_attrs(node, &num_attrs, &names,
&value_lengths, &values, 1 << 15); /* free memory */
if (a_text != NULL)
free(a_text);
if (d_text != NULL)
free(d_text);
if(acl != NULL)
free(acl);
return ret;
bad_decode:;
/* >>> something is wrong with the attribute value */;
/* >>> invent better error code */
ret = ISO_ERROR;
goto ex;
#else /* Libisofs_with_aaiP */
if (acl_text != NULL) {
/* >>> No ACL enabled in program code */;
return(0);
}
return (1);
#endif /* ! Libisofs_with_aaiP */
}
/* ts A90118 */
int iso_local_set_acl_text(char *disk_path, char *text, int flag)
{
#ifdef Libisofs_with_aaiP
return aaip_set_acl_text(disk_path, text, flag & 1);
#else /* Libisofs_with_aaiP */
return 0;
#endif /* ! Libisofs_with_aaiP */
}
/* ts A90127 */
int iso_local_get_acl_text(char *disk_path, char **text, int flag)
{
#ifdef Libisofs_with_aaiP
return aaip_get_acl_text(disk_path, text, flag & (1 | 16 | (1 << 15)));
#else /* Libisofs_with_aaiP */
return 0;
#endif /* ! Libisofs_with_aaiP */
}
Reference in New Issue View Git Blame Copy Permalink