1/*
2 * Copyright (c) 1985, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <config.h>
31
32#ifndef HAVE_GETUSERSHELL
33
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <ctype.h>
38#ifdef HAVE_PATHS_H
39#include <paths.h>
40#endif
41#ifdef HAVE_SYS_TYPES_H
42#include <sys/types.h>
43#endif
44#ifdef HAVE_SYS_STAT_H
45#include <sys/stat.h>
46#endif
47#ifdef HAVE_SYS_PARAM_H
48#include <sys/param.h>
49#endif
50
51#ifdef HAVE_USERSEC_H
52struct aud_rec;
53#include <usersec.h>
54#endif
55#ifdef HAVE_USERCONF_H
56#include <userconf.h>
57#endif
58#include "roken.h"
59
60#ifndef _PATH_SHELLS
61#define _PATH_SHELLS "/etc/shells"
62#endif
63
64#ifndef _PATH_BSHELL
65#define _PATH_BSHELL "/bin/sh"
66#endif
67
68#ifndef _PATH_CSHELL
69#define _PATH_CSHELL "/bin/csh"
70#endif
71
72/*
73 * Local shells should NOT be added here.  They should be added in
74 * /etc/shells.
75 */
76
77static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
78static char **curshell, **shells, *strings;
79static char **initshells (void);
80
81/*
82 * Get a list of shells from _PATH_SHELLS, if it exists.
83 */
84ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
85getusershell()
86{
87    char *ret;
88
89    if (curshell == NULL)
90	curshell = initshells();
91    ret = *curshell;
92    if (ret != NULL)
93	curshell++;
94    return (ret);
95}
96
97ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
98endusershell()
99{
100    if (shells != NULL)
101	free(shells);
102    shells = NULL;
103    if (strings != NULL)
104	free(strings);
105    strings = NULL;
106    curshell = NULL;
107}
108
109ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
110setusershell()
111{
112    curshell = initshells();
113}
114
115static char **
116initshells()
117{
118    char **sp, *cp;
119#ifdef HAVE_GETCONFATTR
120    char *tmp;
121    int nsh;
122#else
123    FILE *fp;
124#endif
125    struct stat statb;
126
127    free(shells);
128    shells = NULL;
129    free(strings);
130    strings = NULL;
131#ifdef HAVE_GETCONFATTR
132    if(getconfattr(SC_SYS_LOGIN, SC_SHELLS, &tmp, SEC_LIST) != 0)
133	return okshells;
134
135    for(cp = tmp, nsh = 0; *cp; cp += strlen(cp) + 1, nsh++);
136
137    shells = calloc(nsh + 1, sizeof(*shells));
138    if(shells == NULL)
139	return okshells;
140
141    strings = malloc(cp - tmp);
142    if(strings == NULL) {
143	free(shells);
144	shells = NULL;
145	return okshells;
146    }
147    memcpy(strings, tmp, cp - tmp);
148    for(sp = shells, cp = strings; *cp; cp += strlen(cp) + 1, sp++)
149	*sp = cp;
150#else
151    if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
152	return (okshells);
153    if (fstat(fileno(fp), &statb) == -1) {
154	fclose(fp);
155	return (okshells);
156    }
157    if ((strings = malloc((u_int)statb.st_size)) == NULL) {
158	fclose(fp);
159	return (okshells);
160    }
161    shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
162    if (shells == NULL) {
163	fclose(fp);
164	free(strings);
165	strings = NULL;
166	return (okshells);
167    }
168    sp = shells;
169    cp = strings;
170    while (fgets(cp, MaxPathLen + 1, fp) != NULL) {
171	while (*cp != '#' && *cp != '/' && *cp != '\0')
172	    cp++;
173	if (*cp == '#' || *cp == '\0')
174	    continue;
175	*sp++ = cp;
176	while (!isspace((unsigned char)*cp) && *cp != '#' && *cp != '\0')
177	    cp++;
178	*cp++ = '\0';
179    }
180    fclose(fp);
181#endif
182    *sp = NULL;
183    return (shells);
184}
185#endif /* HAVE_GETUSERSHELL */
186