Commit aac9c231 authored by Thomas Schmitt's avatar Thomas Schmitt

Introduced system adapters for getting and setting EA and ACL

parent 6caddd28
This diff is collapsed.
/*
aaip-os-freebsd.c
Arbitrary Attribute Interchange Protocol , system adapter for getting and
setting of ACLs and XFS-style Extended Attributes.
To be included by aaip_0_2.c
*/
#include <ctype.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/acl.h>
/* ------------------------------ Getters --------------------------------- */
/* Obtain the ACL of the given file in long text form.
@param path Path to the file
@param text Will hold the result. This is a managed object which
finally has to be freed by a call to this function
with bit15 of flag.
@param flag Bitfield for control purposes
bit0= obtain default ACL rather than access ACL
bit15= free text and return 1
@return > 0 ok
-1 failure of system ACL service (see errno)
*/
int aaip_get_acl_text(char *path, char **text, int flag)
{
acl_t acl= NULL;
if(flag & (1 << 15)) {
if(*text != NULL)
acl_free(text);
*text= NULL;
return(1);
}
*text= NULL;
/* Note: no ACL_TYPE_DEFAULT in FreeBSD */
if(flag & 1)
return(0);
acl= acl_get_file(path, ACL_TYPE_ACCESS);
if(acl == NULL)
return(-1);
*text= acl_to_text(acl, NULL);
acl_free(acl);
if(*text == NULL)
return(-1);
return(1);
}
/* Obtain the Extended Attributes and/or the ACLs of the given file in a form
that is ready for aaip_encode().
Note: There are no Extended Attributes in FreeBSD. So only ACL will be
obtained.
@param path Path to the file
@param num_attrs Will return the number of name-value pairs
@param names Will return an array of pointers to 0-terminated names
@param value_lengths Will return an arry with the lenghts of values
@param values Will return an array of pointers to 8-bit values
@param flag Bitfield for control purposes
bit0= obtain ACL (access and eventually default)
bit1= use numeric ACL qualifiers rather than names
bit2= do not encode attributes other than ACL
bit15= free memory of names, value_lengths, values
@return >0 ok
<=0 error
*/
int aaip_get_attr_list(char *path, size_t *num_attrs, char ***names,
size_t **value_lengths, char ***values, int flag)
{
int ret, retry= 0;
char *list= NULL;
ssize_t list_size= 0, i, num_names, value_ret;
size_t a_acl_len= 0, d_acl_len= 0, acl_len= 0;
unsigned char *a_acl= NULL, *d_acl= NULL, *acl= NULL;
char *acl_text= NULL;
if(flag & (1 << 15)) { /* Free memory */
if(*names != NULL)
list= (*names)[0];
{ret= 1; goto ex;}
}
*num_attrs= 0;
*names= NULL;
*value_lengths= NULL;
*values= NULL;
if(flag & 1)
num_names++;
if(num_names == 0)
{ret= 1; goto ex;}
(*names)= calloc(num_names, sizeof(char *));
(*value_lengths)= calloc(num_names, sizeof(size_t));
(*values)= calloc(num_names, sizeof(char *));
if(*names == NULL || *value_lengths == NULL || *values == NULL)
{ret= -1; goto ex;}
for(i= *num_attrs; i < num_names; i++)
(*names)[i]= NULL;
for(i= 0; i < num_names; i++) {
(*values)[i]= NULL;
(*value_lengths)[i]= 0;
}
if(flag & 1) { /* Obtain ACL */
/* access-ACL */
ret= aaip_get_acl_text(path, &acl_text, 0);
if(ret <= 0)
goto ex;
ret= aaip_encode_acl(acl_text, &a_acl_len, &a_acl, flag & 2);
if(ret <= 0)
goto ex;
aaip_get_acl_text("", &acl_text, 1 << 15); /* free */
/* Note: There are no default-ACL in FreeBSD */
/* Set as attribute with empty name */;
(*names)[*num_attrs]= strdup("");
if((*names)[*num_attrs] == NULL)
{ret= -1; goto ex;}
(*values)[*num_attrs]= (char *) acl;
(*value_lengths)[*num_attrs]= acl_len;
(*num_attrs)++;
}
ret= 1;
ex:;
if(a_acl != NULL)
free(a_acl);
if(d_acl != NULL)
free(d_acl);
if(acl_text != NULL)
aaip_get_acl_text("", &acl_text, 1 << 15); /* free */
if(ret <= 0 || (flag & (1 << 15))) {
if(list != NULL)
free(list);
if(*names != NULL)
free(*names);
*names= NULL;
if(*value_lengths != NULL)
free(*value_lengths);
*value_lengths= NULL;
if(*values != NULL) {
for(i= 0; i < *num_attrs; i++)
free((*values)[i]);
free(*values);
}
if(acl != NULL)
free(acl);
*values= NULL;
*num_attrs= 0;
}
return(ret);
}
/* ------------------------------ Setters --------------------------------- */
/* Set the ACL of the given file to a given list in long text form.
@param path Path to the file
@param text The input text (0 terminated, ACL long text form)
@param flag Bitfield for control purposes
bit0= set default ACL rather than access ACL
@return > 0 ok
-1 failure of system ACL service (see errno)
*/
int aaip_set_acl_text(char *path, char *text, int flag)
{
int ret;
acl_t acl= NULL;
acl= acl_from_text(text);
if(acl == NULL) {
ret= -1; goto ex;
}
/* Note: no ACL_TYPE_DEFAULT in FreeBSD */
if(flag & 1)
{ret= 0; goto ex;}
ret= acl_set_file(path, ACL_TYPE_ACCESS, acl);
if(ret == -1)
goto ex;
ret= 1;
ex:
if(acl != NULL)
acl_free(acl);
return(ret);
}
/* Bring the given attributes and/or ACLs into effect with the given file.
Note: There are no Extended Attributes in FreeBSD. So only ACL get set.
@param flag Bitfield for control purposes
bit0= decode and set ACLs
( bit1= first clear all existing attributes of the file )
( bit2= do not set attributes other than ACLs )
@return 1 success
-1 error memory allocation
-2 error with decoding of ACL
-3 error with setting ACL
( -4 error with setting attribute )
( -5 error with deleting attribute )
*/
int aaip_set_attr_list(char *path, size_t num_attrs, char **names,
size_t *value_lengths, char **values, int flag)
{
int ret, has_default_acl= 0;
size_t i, consumed, acl_text_fill, list_size= 0;
char *acl_text= NULL, *list= NULL;
for(i= 0; i < num_attrs; i++) {
if(names[i] == NULL || values[i] == NULL)
continue;
if(names[i][0] == 0) { /* Decode ACLs */
/* access ACL */
ret= aaip_decode_acl((unsigned char *) values[i], value_lengths[i],
&consumed, NULL, 0, &acl_text_fill, 1);
if(ret <= 0)
{ret= -2; goto ex;}
acl_text= calloc(acl_text_fill, 1);
if(acl_text == NULL)
{ret= -1; goto ex;}
ret= aaip_decode_acl((unsigned char *) values[i], value_lengths[i],
&consumed, acl_text, acl_text_fill, &acl_text_fill, 0);
if(ret <= 0)
{ret= -2; goto ex;}
has_default_acl= (ret == 2);
ret= aaip_set_acl_text(path, acl_text, 0);
if(ret <= 0)
{ret= -3; goto ex;}
if(has_default_acl) {
free(acl_text);
acl_text= NULL;
ret= aaip_decode_acl((unsigned char *) (values[i] + consumed),
value_lengths[i] - consumed, &consumed,
NULL, 0, &acl_text_fill, 1);
if(ret <= 0)
{ret= -2; goto ex;}
acl_text= calloc(acl_text_fill, 1);
if(acl_text == NULL)
{ret= -1; goto ex;}
ret= aaip_decode_acl((unsigned char *) (values[i] + consumed),
value_lengths[i] - consumed, &consumed,
acl_text, acl_text_fill, &acl_text_fill, 0);
if(ret <= 0)
{ret= -2; goto ex;}
ret= aaip_set_acl_text(path, acl_text, 1);
if(ret <= 0)
{ret= -3; goto ex;}
}
}
}
ret= 1;
ex:;
if(acl_text != NULL)
free(acl_text);
if(list != NULL)
free(list);
return(ret);
}
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