lib/roken/getusershell.c

   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 #ifdef HAVE_CONFIG_H
  31 #include <config.h>
  32 #endif
  33
  34 RCSID("$Id$");
  35
  36 #ifndef HAVE_GETUSERSHELL
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42 #ifdef HAVE_PATHS_H
  43 #include <paths.h>
  44 #endif
  45 #ifdef HAVE_SYS_TYPES_H
  46 #include <sys/types.h>
  47 #endif
  48 #ifdef HAVE_SYS_STAT_H
  49 #include <sys/stat.h>
  50 #endif
  51 #ifdef HAVE_SYS_PARAM_H
  52 #include <sys/param.h>
  53 #endif
  54
  55 #ifdef HAVE_USERSEC_H
  56 struct aud_rec;
  57 #include <usersec.h>
  58 #endif
  59 #ifdef HAVE_USERCONF_H
  60 #include <userconf.h>
  61 #endif
  62 #include "roken.h"
  63
  64 #ifndef _PATH_SHELLS
  65 #define _PATH_SHELLS "/etc/shells"
  66 #endif
  67
  68 #ifndef _PATH_BSHELL
  69 #define _PATH_BSHELL "/bin/sh"
  70 #endif
  71
  72 #ifndef _PATH_CSHELL
  73 #define _PATH_CSHELL "/bin/csh"
  74 #endif
  75
  76 /*
  77  * Local shells should NOT be added here.  They should be added in
  78  * /etc/shells.
  79  */
  80
  81 static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
  82 static char **curshell, **shells, *strings;
  83 static char **initshells (void);
  84
  85 /*
  86  * Get a list of shells from _PATH_SHELLS, if it exists.
  87  */
  88 char * ROKEN_LIB_FUNCTION
  89 getusershell()
  90 {
  91     char *ret;
  92
  93     if (curshell == NULL)
  94         curshell = initshells();
  95     ret = *curshell;
  96     if (ret != NULL)
  97         curshell++;
  98     return (ret);
  99 }
 100
 101 void ROKEN_LIB_FUNCTION
 102 endusershell()
 103 {
 104     if (shells != NULL)
 105         free(shells);
 106     shells = NULL;
 107     if (strings != NULL)
 108         free(strings);
 109     strings = NULL;
 110     curshell = NULL;
 111 }
 112
 113 void ROKEN_LIB_FUNCTION
 114 setusershell()
 115 {
 116     curshell = initshells();
 117 }
 118
 119 static char **
 120 initshells()
 121 {
 122     char **sp, *cp;
 123 #ifdef HAVE_GETCONFATTR
 124     char *tmp;
 125     int nsh;
 126 #else
 127     FILE *fp;
 128 #endif
 129     struct stat statb;
 130
 131     free(shells);
 132     shells = NULL;
 133     free(strings);
 134     strings = NULL;
 135 #ifdef HAVE_GETCONFATTR
 136     if(getconfattr(SC_SYS_LOGIN, SC_SHELLS, &tmp, SEC_LIST) != 0)
 137         return okshells;
 138
 139     for(cp = tmp, nsh = 0; *cp; cp += strlen(cp) + 1, nsh++);
 140
 141     shells = calloc(nsh + 1, sizeof(*shells));
 142     if(shells == NULL)
 143         return okshells;
 144
 145     strings = malloc(cp - tmp);
 146     if(strings == NULL) {
 147         free(shells);
 148         shells = NULL;
 149         return okshells;
 150     }
 151     memcpy(strings, tmp, cp - tmp);
 152     for(sp = shells, cp = strings; *cp; cp += strlen(cp) + 1, sp++)
 153         *sp = cp;
 154 #else
 155     if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
 156         return (okshells);
 157     if (fstat(fileno(fp), &statb) == -1) {
 158         fclose(fp);
 159         return (okshells);
 160     }
 161     if ((strings = malloc((u_int)statb.st_size)) == NULL) {
 162         fclose(fp);
 163         return (okshells);
 164     }
 165     shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
 166     if (shells == NULL) {
 167         fclose(fp);
 168         free(strings);
 169         strings = NULL;
 170         return (okshells);
 171     }
 172     sp = shells;
 173     cp = strings;
 174     while (fgets(cp, MaxPathLen + 1, fp) != NULL) {
 175         while (*cp != '#' && *cp != '/' && *cp != '\0')
 176             cp++;
 177         if (*cp == '#' || *cp == '\0')
 178             continue;
 179         *sp++ = cp;
 180         while (!isspace((unsigned char)*cp) && *cp != '#' && *cp != '\0')
 181             cp++;
 182         *cp++ = '\0';
 183     }
 184     fclose(fp);
 185 #endif
 186     *sp = NULL;
 187     return (shells);
 188 }
 189 #endif /* HAVE_GETUSERSHELL */