307 lines
6.5 KiB
C
307 lines
6.5 KiB
C
/* $NetBSD: getusershell.c,v 1.23 2003/08/07 16:42:51 agc Exp $ */
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/*
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* Copyright (c) 1985, 1993
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* The Regents of the University of California. 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 the University 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 THE REGENTS 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 THE REGENTS 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 <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: getusershell.c,v 1.23 2003/08/07 16:42:51 agc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/file.h>
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#include <ctype.h>
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#include <errno.h>
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#include <nsswitch.h>
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#include <paths.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stringlist.h>
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#include <unistd.h>
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#ifdef HESIOD
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#include <hesiod.h>
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#endif
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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/ypclnt.h>
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#include <rpcsvc/yp_prot.h>
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#endif
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#ifdef __weak_alias
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__weak_alias(endusershell,_endusershell)
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__weak_alias(getusershell,_getusershell)
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__weak_alias(setusershell,_setusershell)
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#endif
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/*
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* Local shells should NOT be added here. They should be added in
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* /etc/shells.
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*/
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static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
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static const char *const *curshell;
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static StringList *sl;
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static const char *const *initshells __P((void));
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/*
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* Get a list of shells from "shells" nsswitch database
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*/
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__aconst char *
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getusershell()
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{
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__aconst char *ret;
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if (curshell == NULL)
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curshell = initshells();
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/*LINTED*/
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ret = (__aconst char *)*curshell;
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if (ret != NULL)
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curshell++;
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return (ret);
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}
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void
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endusershell()
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{
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if (sl)
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sl_free(sl, 1);
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sl = NULL;
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curshell = NULL;
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}
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void
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setusershell()
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{
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curshell = initshells();
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}
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static int _local_initshells __P((void *, void *, va_list));
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/*ARGSUSED*/
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static int
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_local_initshells(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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{
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char *sp, *cp;
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FILE *fp;
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char line[MAXPATHLEN + 2];
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if (sl)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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return (NS_UNAVAIL);
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if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
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return (NS_UNAVAIL);
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sp = cp = line;
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while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
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while (*cp != '#' && *cp != '/' && *cp != '\0')
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cp++;
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if (*cp == '#' || *cp == '\0')
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continue;
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sp = cp;
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while (!isspace((unsigned char) *cp) && *cp != '#'
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&& *cp != '\0')
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cp++;
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*cp++ = '\0';
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if (sl_add(sl, strdup(sp)) == -1)
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return (NS_UNAVAIL);
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}
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(void)fclose(fp);
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return (NS_SUCCESS);
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}
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#ifdef HESIOD
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static int _dns_initshells __P((void *, void *, va_list));
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/*ARGSUSED*/
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static int
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_dns_initshells(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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{
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char shellname[] = "shells-XXXXX";
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int hsindex, hpi, r;
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char **hp;
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void *context;
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if (sl)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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return (NS_UNAVAIL);
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r = NS_UNAVAIL;
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if (hesiod_init(&context) == -1)
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return (r);
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for (hsindex = 0; ; hsindex++) {
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snprintf(shellname, sizeof(shellname)-1, "shells-%d", hsindex);
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hp = hesiod_resolve(context, shellname, "shells");
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if (hp == NULL) {
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if (errno == ENOENT) {
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if (hsindex == 0)
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r = NS_NOTFOUND;
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else
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r = NS_SUCCESS;
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}
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break;
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} else {
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int bad = 0;
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for (hpi = 0; hp[hpi]; hpi++)
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if (sl_add(sl, hp[hpi]) == -1) {
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bad = 1;
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break;
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}
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free(hp);
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if (bad)
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break;
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}
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}
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hesiod_end(context);
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return (r);
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}
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#endif /* HESIOD */
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#ifdef YP
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static int _nis_initshells __P((void *, void *, va_list));
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/*ARGSUSED*/
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static int
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_nis_initshells(rv, cb_data, ap)
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void *rv;
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void *cb_data;
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va_list ap;
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{
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static char *ypdomain;
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if (sl)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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return (NS_UNAVAIL);
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if (ypdomain == NULL) {
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switch (yp_get_default_domain(&ypdomain)) {
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case 0:
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break;
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case YPERR_RESRC:
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return (NS_TRYAGAIN);
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default:
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return (NS_UNAVAIL);
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}
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}
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for (;;) {
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char *ypcur = NULL;
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int ypcurlen = 0; /* XXX: GCC */
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char *key, *data;
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int keylen, datalen;
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int r;
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key = data = NULL;
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if (ypcur) {
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r = yp_next(ypdomain, "shells", ypcur, ypcurlen,
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&key, &keylen, &data, &datalen);
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free(ypcur);
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switch (r) {
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case 0:
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break;
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case YPERR_NOMORE:
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free(key);
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free(data);
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return (NS_SUCCESS);
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default:
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free(key);
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free(data);
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return (NS_UNAVAIL);
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}
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ypcur = key;
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ypcurlen = keylen;
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} else {
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if (yp_first(ypdomain, "shells", &ypcur,
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&ypcurlen, &data, &datalen)) {
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free(data);
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return (NS_UNAVAIL);
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}
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}
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data[datalen] = '\0'; /* clear trailing \n */
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if (sl_add(sl, data) == -1)
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return (NS_UNAVAIL);
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}
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}
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#endif /* YP */
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static const char *const *
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initshells()
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{
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_local_initshells, NULL)
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NS_DNS_CB(_dns_initshells, NULL)
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NS_NIS_CB(_nis_initshells, NULL)
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{ 0 }
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};
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if (sl)
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sl_free(sl, 1);
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sl = sl_init();
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if (!sl)
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goto badinitshells;
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if (nsdispatch(NULL, dtab, NSDB_SHELLS, "initshells", __nsdefaultsrc)
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!= NS_SUCCESS) {
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badinitshells:
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if (sl)
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sl_free(sl, 1);
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sl = NULL;
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return (okshells);
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}
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if (sl_add(sl, NULL) == -1)
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goto badinitshells;
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return (const char *const *)(sl->sl_str);
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}
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