How do I get shadow passwords by uid?

How do I get shadow passwords by uid?




My system uses the getsp* suite of routines to get the sensitive user
information. However I do not have getspuid(), only
getspnam(). How do I work around this, and get by uid?




The work around is relatively painless. The following routine should go
straight into your personal utility library: 





#include <stdlib.h>


#include <stdio.h>





#include <pwd.h>


#include <shadow.h>





struct spwd *getspuid(uid_t pw_uid)


{


  struct spwd *shadow;


  struct passwd *ppasswd;





  if( ((ppasswd = getpwuid(pw_uid)) == NULL) 


      || ((shadow = getspnam(ppasswd->pw_name)) == NULL))


    return NULL;


  


  return shadow;


}



The problem is, that some systems do not keep the uid, or other
information in the shadow database.





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