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      1 /*
      2  * This file describes the internal interface used by the labeler
      3  * for calling the user-supplied memory allocation, validation,
      4  * and locking routine.
      5  *
      6  * Author : Eamon Walsh <ewalsh (at) epoch.ncsc.mil>
      7  */
      8 #ifndef _SELABEL_INTERNAL_H_
      9 #define _SELABEL_INTERNAL_H_
     10 
     11 #include <stdlib.h>
     12 #include <stdarg.h>
     13 #include <selinux/selinux.h>
     14 #include <selinux/label.h>
     15 #include "dso.h"
     16 
     17 /*
     18  * Installed backends
     19  */
     20 int selabel_file_init(struct selabel_handle *rec, const struct selinux_opt *opts,
     21 		      unsigned nopts) hidden;
     22 int selabel_media_init(struct selabel_handle *rec, const struct selinux_opt *opts,
     23 		      unsigned nopts) hidden;
     24 int selabel_x_init(struct selabel_handle *rec, const struct selinux_opt *opts,
     25 		   unsigned nopts) hidden;
     26 int selabel_db_init(struct selabel_handle *rec,
     27 		    const struct selinux_opt *opts, unsigned nopts) hidden;
     28 int selabel_property_init(struct selabel_handle *rec,
     29 			  const struct selinux_opt *opts, unsigned nopts) hidden;
     30 
     31 /*
     32  * Labeling internal structures
     33  */
     34 struct selabel_sub {
     35 	char *src;
     36 	int slen;
     37 	char *dst;
     38 	struct selabel_sub *next;
     39 };
     40 
     41 struct selabel_lookup_rec {
     42 	char * ctx_raw;
     43 	char * ctx_trans;
     44 	int validated;
     45 };
     46 
     47 struct selabel_handle {
     48 	/* arguments that were passed to selabel_open */
     49 	unsigned int backend;
     50 	int validating;
     51 
     52 	/* labeling operations */
     53 	struct selabel_lookup_rec *(*func_lookup) (struct selabel_handle *h,
     54 						   const char *key, int type);
     55 	void (*func_close) (struct selabel_handle *h);
     56 	void (*func_stats) (struct selabel_handle *h);
     57 	bool (*func_partial_match) (struct selabel_handle *h, const char *key);
     58 	struct selabel_lookup_rec *(*func_lookup_best_match) (struct selabel_handle *h,
     59 							 const char *key,
     60 							 const char **aliases,
     61 							 int type);
     62 
     63 	/* supports backend-specific state information */
     64 	void *data;
     65 
     66 	/* substitution support */
     67 	struct selabel_sub *subs;
     68 };
     69 
     70 /*
     71  * Validation function
     72  */
     73 extern int
     74 selabel_validate(struct selabel_handle *rec,
     75 		 struct selabel_lookup_rec *contexts) hidden;
     76 
     77 #endif				/* _SELABEL_INTERNAL_H_ */
     78