1 files changed, 133 insertions, 0 deletions
diff --git a/test/t_setreuid.c b/test/t_setreuid.c
new file mode 100644
index 0000000..6622068
--- /dev/null
+++ b/test/t_setreuid.c
@@ -0,0 +1,133 @@
+/*
+**  This program checks to see if your version of setreuid works.
+**  Compile it, make it setuid root, and run it as yourself (NOT as
+**  root).  If it won't compile or outputs any MAYDAY messages, don't
+**  define HASSETREUID in conf.h.
+**
+**  Compilation is trivial -- just "cc t_setreuid.c".  Make it setuid,
+**  root and then execute it as a non-root user.
+*/
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+#ifdef __hpux
+#define setreuid(r, e)	setresuid(r, e, -1)
+#endif
+
+main()
+{
+	int fail = 0;
+	uid_t realuid = getuid();
+
+	printuids("initial uids", realuid, 0);
+
+	if (geteuid() != 0)
+	{
+		printf("SETUP ERROR: re-run setuid root\n");
+		exit(1);
+	}
+
+	if (getuid() == 0)
+	{
+		printf("SETUP ERROR: must be run by a non-root user\n");
+		exit(1);
+	}
+
+	if (setreuid(0, 1) < 0)
+	{
+		fail++;
+		printf("setreuid(0, 1) failure\n");
+	}
+	printuids("after setreuid(0, 1)", 0, 1);
+
+	if (geteuid() != 1)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong effective uid\n");
+	}
+
+	/* do activity here */
+
+	if (setreuid(-1, 0) < 0)
+	{
+		fail++;
+		printf("setreuid(-1, 0) failure\n");
+	}
+	printuids("after setreuid(-1, 0)", 0, 0);
+	if (setreuid(realuid, 0) < 0)
+	{
+		fail++;
+		printf("setreuid(%d, 0) failure\n", realuid);
+	}
+	printuids("after setreuid(realuid, 0)", realuid, 0);
+
+	if (geteuid() != 0)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong effective uid\n");
+	}
+	if (getuid() != realuid)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong real uid\n");
+	}
+	printf("\n");
+
+	if (setreuid(0, 2) < 0)
+	{
+		fail++;
+		printf("setreuid(0, 2) failure\n");
+	}
+	printuids("after setreuid(0, 2)", 0, 2);
+
+	if (geteuid() != 2)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong effective uid\n");
+	}
+
+	/* do activity here */
+
+	if (setreuid(-1, 0) < 0)
+	{
+		fail++;
+		printf("setreuid(-1, 0) failure\n");
+	}
+	printuids("after setreuid(-1, 0)", 0, 0);
+	if (setreuid(realuid, 0) < 0)
+	{
+		fail++;
+		printf("setreuid(%d, 0) failure\n", realuid);
+	}
+	printuids("after setreuid(realuid, 0)", realuid, 0);
+
+	if (geteuid() != 0)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong effective uid\n");
+	}
+	if (getuid() != realuid)
+	{
+		fail++;
+		printf("MAYDAY!  Wrong real uid\n");
+	}
+
+	if (fail)
+	{
+		printf("\nThis system cannot use setreuid\n");
+		exit(1);
+	}
+
+	printf("\nIt is safe to define HASSETREUID on this system\n");
+	exit(0);
+}
+
+printuids(str, r, e)
+	char *str;
+	int r, e;
+{
+	printf("%s (should be %d/%d): r/euid=%d/%d\n", str, r, e,
+		getuid(), geteuid());
+}