- consolidated password helpers

1 files changed, 179 insertions, 0 deletions

diff --git a/libbb/bb_pwd.c b/libbb/bb_pwd.c
new file mode 100644
index 000000000..9ce1c7150
--- /dev/null
+++ b/libbb/bb_pwd.c
@@ -0,0 +1,179 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * password utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under the GPL v2, see the file LICENSE in this tarball.
+ */
+
+
+#ifdef L_bb_getgrgid
+  /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+  * flexible :
+  *
+  * if bufsize is > 0 char *group cannot be set to NULL.
+  *                   On success groupname is written on static allocated buffer
+  *                   group (and a pointer to it is returned).
+  *                   On failure gid as string is written to static allocated
+  *                   buffer group and NULL is returned.
+  * if bufsize is = 0 char *group can be set to NULL.
+  *                   On success groupname is returned.
+  *                   On failure NULL is returned.
+  * if bufsize is < 0 char *group can be set to NULL.
+  *                   On success groupname is returned.
+  *                   On failure an error message is printed and
+  *                   the program exits.
+  */
+
+#include "libbb.h"
+#include "grp_.h"
+
+/* gets a groupname given a gid */
+char * bb_getgrgid(char *group, long gid, int bufsize)
+{
+        struct group *mygroup = getgrgid(gid);
+
+        return  bb_getug(group, (mygroup) ?
+                        mygroup->gr_name : (char *)mygroup, gid, bufsize, 'g');
+}
+#endif /* L_bb_getgrgid */
+
+#ifdef L_bb_xgetgrnam
+#include <stdio.h>
+#include <string.h>
+#include "libbb.h"
+#include "pwd_.h"
+#include "grp_.h"
+
+
+/* returns a gid given a group name */
+long bb_xgetgrnam(const char *name)
+{
+        struct group *mygroup;
+
+        mygroup  = getgrnam(name);
+        if (mygroup==NULL)
+                bb_error_msg_and_die("unknown group name: %s", name);
+
+        return (mygroup->gr_gid);
+}
+#endif /* L_bb_xgetgrnam */
+
+#ifdef L_bb_xgetpwnam
+#include <stdio.h>
+#include <string.h>
+#include "libbb.h"
+#include "pwd_.h"
+#include "grp_.h"
+
+
+/* returns a uid given a username */
+long bb_xgetpwnam(const char *name)
+{
+        struct passwd *myuser;
+
+        myuser  = getpwnam(name);
+        if (myuser==NULL)
+                bb_error_msg_and_die("unknown user name: %s", name);
+
+        return myuser->pw_uid;
+}
+#endif /* L_bb_xgetpwnam */
+
+#ifdef L_bb_getpwuid
+ /* Hacked by Tito Ragusa (c) 2004 <farmatito@tiscali.it> to make it more
+  * flexible :
+  *
+  * if bufsize is > 0 char *name can not be set to NULL.
+  *                   On success username is written on the static allocated
+  *                   buffer name (and a pointer to it is returned).
+  *                   On failure uid as string is written to the static
+  *                   allocated buffer name and NULL is returned.
+  * if bufsize is = 0 char *name can be set to NULL.
+  *                   On success username is returned.
+  *                   On failure NULL is returned.
+  * if bufsize is < 0 char *name can be set to NULL
+  *                   On success username is returned.
+  *                   On failure an error message is printed and
+  *                   the program exits.
+  */
+
+#include "libbb.h"
+#include "pwd_.h"
+
+/* gets a username given a uid */
+char * bb_getpwuid(char *name, long uid, int bufsize)
+{
+        struct passwd *myuser = getpwuid(uid);
+
+        return  bb_getug(name, (myuser) ?
+                        myuser->pw_name : (char *)myuser , uid, bufsize, 'u');
+}
+#endif /* L_bb_getpwuid */
+
+#ifdef L_bb_getug
+ /*
+  * if bufsize is > 0 char *buffer can not be set to NULL.
+  *                   If idname is not NULL it is written on the static
+  *                   allocated buffer (and a pointer to it is returned).
+  *                   if idname is NULL, id as string is written to the static
+  *                   allocated buffer and NULL is returned.
+  * if bufsize is = 0 char *buffer can be set to NULL.
+  *                   If idname exists a pointer to it is returned,
+  *                   else NULL is returned.
+  * if bufsize is < 0 char *buffer can be set to NULL.
+  *                   If idname exists a pointer to it is returned,
+  *                   else an error message is printed and the program exits.
+  */
+
+#include <stdio.h>
+#include <assert.h>
+#include "libbb.h"
+
+
+/* internal function for bb_getpwuid and bb_getgrgid */
+char * bb_getug(char *buffer, char *idname, long id, int bufsize, char prefix)
+{
+        if(bufsize > 0 ) {
+                assert(buffer!=NULL);
+                if(idname) {
+                        return safe_strncpy(buffer, idname, bufsize);
+                }
+                snprintf(buffer, bufsize, "%ld", id);
+        } else if(bufsize < 0 && !idname) {
+                bb_error_msg_and_die("unknown %cid %ld", prefix, id);
+        }
+        return idname;
+}
+#endif /* L_bb_getug */
+
+
+#ifdef L_get_ug_id
+/* indirect dispatcher for pwd helpers.  */
+#include <stdlib.h>
+
+extern unsigned long get_ug_id(const char *s,
+                long (*__bb_getxxnam)(const char *))
+{
+        unsigned long r;
+        char *p;
+
+        r = strtoul(s, &p, 10);
+        if (*p || (s == p)) {
+                r = __bb_getxxnam(s);
+        }
+
+        return r;
+}
+#endif /* L_get_ug_id */
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
+