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-rw-r--r--lib/loginprompt.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/lib/loginprompt.c b/lib/loginprompt.c
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+++ b/lib/loginprompt.c
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+/*
+ * SPDX-FileCopyrightText: 1989 - 1993, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 - 2011, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <stdio.h>
+#include <signal.h>
+
+#include "alloc.h"
+#include "attr.h"
+#include "memzero.h"
+#include "prototypes.h"
+#include "defines.h"
+#include "getdef.h"
+
+static void login_exit (MAYBE_UNUSED int sig)
+{
+ _exit (EXIT_FAILURE);
+}
+
+/*
+ * login_prompt - prompt the user for their login name
+ *
+ * login_prompt() displays the standard login prompt. If ISSUE_FILE
+ * is set in login.defs, this file is displayed before the prompt.
+ */
+
+void login_prompt (char *name, int namesize)
+{
+ char buf[1024];
+
+ char *cp;
+ int i;
+ FILE *fp;
+ const char *fname = getdef_str ("ISSUE_FILE");
+
+ sighandler_t sigquit;
+ sighandler_t sigtstp;
+
+ /*
+ * There is a small chance that a QUIT character will be part of
+ * some random noise during a prompt. Deal with this by exiting
+ * instead of core dumping. Do the same thing for SIGTSTP.
+ */
+
+ sigquit = signal (SIGQUIT, login_exit);
+ sigtstp = signal (SIGTSTP, login_exit);
+
+ /*
+ * See if the user has configured the issue file to
+ * be displayed and display it before the prompt.
+ */
+
+ if (NULL != fname) {
+ fp = fopen (fname, "r");
+ if (NULL != fp) {
+ while ((i = getc (fp)) != EOF) {
+ (void) putc (i, stdout);
+ }
+
+ (void) fclose (fp);
+ }
+ }
+ (void) gethostname (buf, sizeof buf);
+ printf (_("\n%s login: "), buf);
+ (void) fflush (stdout);
+
+ /*
+ * Read the user's response. The trailing newline will be
+ * removed.
+ */
+
+ MEMZERO(buf);
+ if (fgets (buf, sizeof buf, stdin) != buf) {
+ exit (EXIT_FAILURE);
+ }
+
+ cp = strchr (buf, '\n');
+ if (NULL == cp) {
+ exit (EXIT_FAILURE);
+ }
+ *cp = '\0'; /* remove \n [ must be there ] */
+
+ /*
+ * Skip leading whitespace. This makes " username" work right.
+ * Then copy the rest (up to the end) into the username.
+ */
+
+ for (cp = buf; *cp == ' ' || *cp == '\t'; cp++);
+
+ for (i = 0; i < namesize - 1 && *cp != '\0'; name[i++] = *cp++);
+
+ name[i] = '\0';
+
+ /*
+ * Set the SIGQUIT handler back to its original value
+ */
+
+ (void) signal (SIGQUIT, sigquit);
+ (void) signal (SIGTSTP, sigtstp);
+}
+