1 files changed, 111 insertions, 0 deletions
diff --git a/coreutils/id.c b/coreutils/id.c
new file mode 100644
index 000000000..66874a71e
--- /dev/null
+++ b/coreutils/id.c
@@ -0,0 +1,111 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini id implementation for busybox
+ *
+ * Copyright (C) 2000 by Randolph Chung <tausq@debian.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+/* BB_AUDIT SUSv3 _NOT_ compliant -- option -G is not currently supported. */
+/* Hacked by Tito Ragusa (C) 2004 to handle usernames of whatever length and to
+ * be more similar to GNU id.
+ */
+
+#include "busybox.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#ifdef CONFIG_SELINUX
+#include <selinux/selinux.h>          /* for is_selinux_enabled() */
+#endif
+
+#define PRINT_REAL        1
+#define NAME_NOT_NUMBER   2
+#define JUST_USER         4
+#define JUST_GROUP        8
+
+static short printf_full(unsigned int id, const char *arg, const char prefix)
+{
+	const char *fmt = "%cid=%u";
+	short status = EXIT_FAILURE;
+
+	if (arg) {
+		fmt = "%cid=%u(%s)";
+		status = EXIT_SUCCESS;
+	}
+	printf(fmt, prefix, id, arg);
+	return status;
+}
+
+int id_main(int argc, char **argv)
+{
+	struct passwd *p;
+	uid_t uid;
+	gid_t gid;
+	unsigned long flags;
+	short status;
+
+	/* Don't allow -n -r -nr -ug -rug -nug -rnug */
+	/* Don't allow more than one username */
+	opt_complementary = "?1:?:u--g:g--u:r?ug:n?ug";
+	flags = getopt32(argc, argv, "rnug");
+
+	/* This values could be overwritten later */
+	uid = geteuid();
+	gid = getegid();
+	if (flags & PRINT_REAL) {
+		uid = getuid();
+		gid = getgid();
+	}
+
+	if (argv[optind]) {
+		p = getpwnam(argv[optind]);
+		/* bb_xgetpwnam is needed because it exits on failure */
+		uid = bb_xgetpwnam(argv[optind]);
+		gid = p->pw_gid;
+		/* in this case PRINT_REAL is the same */
+	}
+
+	if (flags & (JUST_GROUP | JUST_USER)) {
+		/* JUST_GROUP and JUST_USER are mutually exclusive */
+		if (flags & NAME_NOT_NUMBER) {
+			/* bb_getpwuid and bb_getgrgid exit on failure so puts cannot segfault */
+			puts((flags & JUST_USER) ? bb_getpwuid(NULL, uid, -1 ) : bb_getgrgid(NULL, gid, -1 ));
+		} else {
+			printf("%u\n", (flags & JUST_USER) ? uid : gid);
+		}
+		/* exit */
+		fflush_stdout_and_exit(EXIT_SUCCESS);
+	}
+
+	/* Print full info like GNU id */
+	/* bb_getpwuid doesn't exit on failure here */
+	status = printf_full(uid, bb_getpwuid(NULL, uid, 0), 'u');
+	putchar(' ');
+	/* bb_getgrgid doesn't exit on failure here */
+	status |= printf_full(gid, bb_getgrgid(NULL, gid, 0), 'g');
+
+#ifdef CONFIG_SELINUX
+	if (is_selinux_enabled()) {
+			security_context_t mysid;
+			char context[80];
+			int len = sizeof(context);
+
+			getcon(&mysid);
+			context[0] = '\0';
+			if (mysid) {
+				len = strlen(mysid)+1;
+				safe_strncpy(context, mysid, len);
+				freecon(mysid);
+			} else {
+				safe_strncpy(context, "unknown", 8);
+			}
+		printf(" context=%s", context);
+	}
+#endif
+
+	putchar('\n');
+	fflush_stdout_and_exit(status);
+}