Ophestra
e85be67fd9
The original implementation was effectively just writing C in Go. Signed-off-by: Ophestra <cat@gensokyo.uk>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
#include "acl-update.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#include <sys/acl.h>
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#include <acl/libacl.h>
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int f_acl_update_file_by_uid(const char *path_p, uid_t uid, acl_perm_t *perms, size_t plen) {
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int ret = -1;
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bool v;
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int i;
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acl_t acl;
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acl_entry_t entry;
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acl_tag_t tag_type;
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void *qualifier_p;
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acl_permset_t permset;
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acl = acl_get_file(path_p, ACL_TYPE_ACCESS);
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if (acl == NULL)
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goto out;
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// prune entries by uid
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for (i = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry); i == 1; i = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry)) {
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if (acl_get_tag_type(entry, &tag_type) != 0)
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return -1;
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if (tag_type != ACL_USER)
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continue;
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qualifier_p = acl_get_qualifier(entry);
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if (qualifier_p == NULL)
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return -1;
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v = *(uid_t *)qualifier_p == uid;
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acl_free(qualifier_p);
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if (!v)
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continue;
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acl_delete_entry(acl, entry);
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}
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if (plen == 0)
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goto set;
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if (acl_create_entry(&acl, &entry) != 0)
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goto out;
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if (acl_get_permset(entry, &permset) != 0)
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goto out;
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for (i = 0; i < plen; i++) {
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if (acl_add_perm(permset, perms[i]) != 0)
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goto out;
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}
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if (acl_set_tag_type(entry, ACL_USER) != 0)
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goto out;
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if (acl_set_qualifier(entry, (void *)&uid) != 0)
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goto out;
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set:
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if (acl_calc_mask(&acl) != 0)
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goto out;
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if (acl_valid(acl) != 0)
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goto out;
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if (acl_set_file(path_p, ACL_TYPE_ACCESS, acl) == 0)
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ret = 0;
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out:
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free((void *)path_p);
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if (acl != NULL)
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acl_free((void *)acl);
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return ret;
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}
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