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