passwords.h

linux内核

#ifndef _PASSWORDS_H_
#define _PASSWORDS_H_
    
char authenticate_user(const char * username, const char* pwd);

char isallowed(const char *username, const char * perm);

// Initialise the list of of user passwords permissions from file
void init_passwords(const char *filename);
// Free all space used for internal data structures
void close_passwords();

#define MAX_USERS 128       // Maximum number of users
#define USERNAME_LENGTH 12  // Max length of user name
#define PWDHASH_LENGTH  40  // Max lenght of pwd hash

typedef struct {
  char username[USERNAME_LENGTH+1];
  char pwdhash[PWDHASH_LENGTH+1]; 
  char *perms; // pointer to string containing ":" delimited permissions
} pwdentry;

typedef pwdentry *p_pwdentry;

#define GUEST_USER "guest"

#endif