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-rw-r--r--libmisc/loginprompt.c178
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diff --git a/libmisc/loginprompt.c b/libmisc/loginprompt.c
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+++ b/libmisc/loginprompt.c
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+/*
+ * Copyright (c) 1989 - 1993, Julianne Frances Haugh
+ * Copyright (c) 1996 - 2000, Marek Michałkiewicz
+ * Copyright (c) 2003 - 2005, Tomasz Kłoczko
+ * Copyright (c) 2008 - 2011, Nicolas François
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the copyright holders or contributors may not be used to
+ * endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <stdio.h>
+#include <signal.h>
+#include <ctype.h>
+#include "prototypes.h"
+#include "defines.h"
+#include "getdef.h"
+
+static void login_exit (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 (const char *prompt, char *name, int namesize)
+{
+ char buf[1024];
+
+#define MAX_ENV 32
+ char *envp[MAX_ENV];
+ char *cp;
+ int i;
+ FILE *fp;
+
+ RETSIGTYPE (*sigquit) (int);
+#ifdef SIGTSTP
+ RETSIGTYPE (*sigtstp) (int);
+#endif
+
+ /*
+ * 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. If SIGTSTP is defined, do the same
+ * thing for that signal.
+ */
+
+ sigquit = signal (SIGQUIT, login_exit);
+#ifdef SIGTSTP
+ sigtstp = signal (SIGTSTP, login_exit);
+#endif
+
+ /*
+ * See if the user has configured the issue file to
+ * be displayed and display it before the prompt.
+ */
+
+ if (NULL != prompt) {
+ const char *fname = getdef_str ("ISSUE_FILE");
+ 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 (prompt, buf);
+ (void) fflush (stdout);
+ }
+
+ /*
+ * Read the user's response. The trailing newline will be
+ * removed.
+ */
+
+ memzero (buf, sizeof buf);
+ if (fgets (buf, (int) 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 or the first "non-graphic"
+ * character into the username.
+ */
+
+ for (cp = buf; *cp == ' ' || *cp == '\t'; cp++);
+
+ for (i = 0; i < namesize - 1 && isgraph (*cp); name[i++] = *cp++);
+ while (isgraph (*cp)) {
+ cp++;
+ }
+
+ if ('\0' != *cp) {
+ cp++;
+ }
+
+ name[i] = '\0';
+
+ /*
+ * This is a disaster, at best. The user may have entered extra
+ * environmental variables at the prompt. There are several ways
+ * to do this, and I just take the easy way out.
+ */
+
+ if ('\0' != *cp) { /* process new variables */
+ char *nvar;
+ int count = 1;
+ int envc;
+
+ for (envc = 0; envc < MAX_ENV; envc++) {
+ nvar = strtok ((0 != envc) ? (char *) 0 : cp, " \t,");
+ if (NULL == nvar) {
+ break;
+ }
+ if (strchr (nvar, '=') != NULL) {
+ envp[envc] = nvar;
+ } else {
+ size_t len = strlen (nvar) + 32;
+ envp[envc] = xmalloc (len);
+ (void) snprintf (envp[envc], len,
+ "L%d=%s", count++, nvar);
+ }
+ }
+ set_env (envc, envp);
+ }
+
+ /*
+ * Set the SIGQUIT handler back to its original value
+ */
+
+ (void) signal (SIGQUIT, sigquit);
+#ifdef SIGTSTP
+ (void) signal (SIGTSTP, sigtstp);
+#endif
+}
+