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/*
* Implementation of get_username() for Unix.
*/
#include <unistd.h>
#include <pwd.h>
#include "putty.h"
char *get_username(void)
{
struct passwd *p;
uid_t uid = getuid();
char *user, *ret = NULL;
/*
* First, find who we think we are using getlogin. If this
* agrees with our uid, we'll go along with it. This should
* allow sharing of uids between several login names whilst
* coping correctly with people who have su'ed.
*/
user = getlogin();
#if HAVE_SETPWENT
setpwent();
#endif
if (user)
p = getpwnam(user);
else
p = NULL;
if (p && p->pw_uid == uid) {
/*
* The result of getlogin() really does correspond to
* our uid. Fine.
*/
ret = user;
} else {
/*
* If that didn't work, for whatever reason, we'll do
* the simpler version: look up our uid in the password
* file and map it straight to a name.
*/
p = getpwuid(uid);
if (!p)
return NULL;
ret = p->pw_name;
}
#if HAVE_ENDPWENT
endpwent();
#endif
return dupstr(ret);
}
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