From 97c26c1924b076ef23ebe4381558e8aa025712b2 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 16:54:37 +0200
Subject: Adding upstream version 1:4.13+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/id.c | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 src/id.c

(limited to 'src/id.c')

diff --git a/src/id.c b/src/id.c
new file mode 100644
index 0000000..4952109
--- /dev/null
+++ b/src/id.c
@@ -0,0 +1,172 @@
+/*
+ * SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * id - print current process user identification information
+ *
+ *	Print the current process identifiers. This includes the
+ *	UID, GID, effective-UID and effective-GID. Optionally print
+ *	the concurrent group set if the current system supports it.
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <grp.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include "defines.h"
+/* local function prototypes */
+static void usage (void);
+
+static void usage (void)
+{
+	(void) fputs (_("Usage: id [-a]\n"), stderr);
+	exit (EXIT_FAILURE);
+}
+
+ /*ARGSUSED*/ int main (int argc, char **argv)
+{
+	uid_t ruid, euid;
+	gid_t rgid, egid;
+	long sys_ngroups;
+
+/*
+ * This block of declarations is particularly strained because of several
+ * different ways of doing concurrent groups. Old BSD systems used int for
+ * gid's, but short for the type passed to getgroups(). Newer systems use
+ * gid_t for everything. Some systems have a small and fixed NGROUPS,
+ * usually about 16 or 32. Others use bigger values.
+ */
+	GETGROUPS_T *groups;
+	int ngroups;
+	bool aflg = 0;
+	struct passwd *pw;
+	struct group *gr;
+
+	(void) setlocale (LC_ALL, "");
+	(void) bindtextdomain (PACKAGE, LOCALEDIR);
+	(void) textdomain (PACKAGE);
+
+	/*
+	 * Dynamically get the maximum number of groups from system, instead
+	 * of using the symbolic constant NGROUPS_MAX. This ensures that the
+	 * group limit is not hard coded into the binary, so it will still
+	 * work if the system library is recompiled.
+	 */
+	sys_ngroups = sysconf (_SC_NGROUPS_MAX);
+	groups = (GETGROUPS_T *) malloc (sizeof (GETGROUPS_T) * sys_ngroups);
+
+	/*
+	 * See if the -a flag has been given to print out the concurrent
+	 * group set.
+	 */
+
+	if (argc > 1) {
+		if ((argc > 2) || (strcmp (argv[1], "-a") != 0)) {
+			usage ();
+		} else {
+			aflg = true;
+		}
+	}
+
+	ruid = getuid ();
+	euid = geteuid ();
+	rgid = getgid ();
+	egid = getegid ();
+
+	/*
+	 * Print out the real user ID and group ID. If the user or group
+	 * does not exist, just give the numerical value.
+	 */
+
+	pw = getpwuid (ruid); /* local, no need for xgetpwuid */
+	if (NULL != pw) {
+		(void) printf ("UID=%lu(%s)",
+		               (unsigned long) ruid, pw->pw_name);
+	} else {
+		(void) printf ("UID=%lu", (unsigned long) ruid);
+	}
+
+	gr = getgrgid (rgid);; /* local, no need for xgetgrgid */
+	if (NULL != gr) {
+		(void) printf (" GID=%lu(%s)",
+		               (unsigned long) rgid, gr->gr_name);
+	} else {
+		(void) printf (" GID=%lu", (unsigned long) rgid);
+	}
+
+	/*
+	 * Print out the effective user ID and group ID if they are
+	 * different from the real values.
+	 */
+
+	if (ruid != euid) {
+		pw = getpwuid (euid); /* local, no need for xgetpwuid */
+		if (NULL != pw) {
+			(void) printf (" EUID=%lu(%s)",
+			               (unsigned long) euid, pw->pw_name);
+		} else {
+			(void) printf (" EUID=%lu", (unsigned long) euid);
+		}
+	}
+	if (rgid != egid) {
+		gr = getgrgid (egid); /* local, no need for xgetgrgid */
+		if (NULL != gr) {
+			(void) printf (" EGID=%lu(%s)",
+			               (unsigned long) egid, gr->gr_name);
+		} else {
+			(void) printf (" EGID=%lu", (unsigned long) egid);
+		}
+	}
+
+	/*
+	 * Print out the concurrent group set if the user has requested it.
+	 * The group numbers will be printed followed by their names.
+	 */
+	if (aflg && (ngroups = getgroups (sys_ngroups, groups)) != -1) {
+		int i;
+
+		/*
+		 * Start off the group message. It will be of the format
+		 *
+		 *      groups=###(aaa),###(aaa),###(aaa)
+		 *
+		 * where "###" is a numerical value and "aaa" is the
+		 * corresponding name for each respective numerical value.
+		 */
+		(void) puts (_(" groups="));
+		for (i = 0; i < ngroups; i++) {
+			if (0 != i)
+				(void) putchar (',');
+
+			/* local, no need for xgetgrgid */
+			gr = getgrgid (groups[i]);
+			if (NULL != gr) {
+				(void) printf ("%lu(%s)",
+				               (unsigned long) groups[i],
+				               gr->gr_name);
+			} else {
+				(void) printf ("%lu",
+				               (unsigned long) groups[i]);
+			}
+		}
+	}
+	free (groups);
+
+	/*
+	 * Finish off the line.
+	 */
+	(void) putchar ('\n');
+
+	return EXIT_SUCCESS;
+}
+
-- 
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