[svn-upgrade] Integrating new upstream version, shadow (19990709)
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nekral-guest
165
libmisc/loginprompt.c
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165
libmisc/loginprompt.c
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/*
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* Copyright 1989 - 1993, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID("$Id: loginprompt.c,v 1.5 1998/04/16 19:57:44 marekm Exp $")
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#include <stdio.h>
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#include <signal.h>
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#include <ctype.h>
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#include "prototypes.h"
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#include "defines.h"
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#include "getdef.h"
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static void
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login_exit(int sig)
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{
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exit(1);
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}
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/*
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* login_prompt - prompt the user for their login name
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*
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* login_prompt() displays the standard login prompt. If ISSUE_FILE
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* is set in login.defs, this file is displayed before the prompt.
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*/
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void
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login_prompt(const char *prompt, char *name, int namesize)
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{
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char buf[1024];
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#define MAX_ENV 32
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char *envp[MAX_ENV];
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int envc;
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char *cp;
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int i;
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FILE *fp;
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RETSIGTYPE (*sigquit) P_((int));
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#ifdef SIGTSTP
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RETSIGTYPE (*sigtstp) P_((int));
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#endif
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/*
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* There is a small chance that a QUIT character will be part of
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* some random noise during a prompt. Deal with this by exiting
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* instead of core dumping. If SIGTSTP is defined, do the same
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* thing for that signal.
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*/
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sigquit = signal(SIGQUIT, login_exit);
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#ifdef SIGTSTP
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sigtstp = signal(SIGTSTP, login_exit);
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#endif
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/*
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* See if the user has configured the issue file to
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* be displayed and display it before the prompt.
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*/
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if (prompt) {
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cp = getdef_str("ISSUE_FILE");
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if (cp && (fp = fopen(cp, "r"))) {
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while ((i = getc(fp)) != EOF)
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putc(i, stdout);
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fclose(fp);
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}
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gethostname(buf, sizeof buf);
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printf(prompt, buf);
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fflush(stdout);
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}
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/*
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* Read the user's response. The trailing newline will be
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* removed.
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*/
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memzero(buf, sizeof buf);
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if (fgets(buf, sizeof buf, stdin) != buf)
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exit(1);
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cp = strchr(buf, '\n');
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if (!cp)
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exit(1);
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*cp = '\0'; /* remove \n [ must be there ] */
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/*
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* Skip leading whitespace. This makes " username" work right.
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* Then copy the rest (up to the end or the first "non-graphic"
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* character into the username.
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*/
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for (cp = buf;*cp == ' ' || *cp == '\t';cp++)
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;
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for (i = 0; i < namesize - 1 && isgraph(*cp); name[i++] = *cp++)
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;
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while (isgraph(*cp))
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cp++;
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if (*cp)
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cp++;
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name[i] = '\0';
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/*
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* This is a disaster, at best. The user may have entered extra
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* environmental variables at the prompt. There are several ways
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* to do this, and I just take the easy way out.
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*/
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if (*cp != '\0') { /* process new variables */
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char *nvar;
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int count = 1;
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for (envc = 0; envc < MAX_ENV; envc++) {
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nvar = strtok(envc ? (char *)0 : cp, " \t,");
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if (!nvar)
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break;
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if (strchr(nvar, '=')) {
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envp[envc] = nvar;
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} else {
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envp[envc] = xmalloc(strlen(nvar) + 32);
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sprintf(envp[envc], "L%d=%s", count++, nvar);
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}
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}
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set_env(envc, envp);
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}
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/*
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* Set the SIGQUIT handler back to its original value
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*/
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signal(SIGQUIT, sigquit);
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#ifdef SIGTSTP
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signal(SIGTSTP, sigtstp);
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#endif
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}
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