getusershell.c revision 1.21
1 /* $NetBSD: getusershell.c,v 1.21 2000/07/07 08:03:37 itohy Exp $ */ 2 3 /* 4 * Copyright (c) 1985, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: getusershell.c,v 1.21 2000/07/07 08:03:37 itohy Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <sys/param.h> 47 #include <sys/file.h> 48 49 #include <ctype.h> 50 #include <errno.h> 51 #include <nsswitch.h> 52 #include <paths.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <stringlist.h> 57 #include <unistd.h> 58 59 #ifdef __STDC__ 60 #include <stdarg.h> 61 #else 62 #include <varargs.h> 63 #endif 64 65 #ifdef HESIOD 66 #include <hesiod.h> 67 #endif 68 #ifdef YP 69 #include <rpc/rpc.h> 70 #include <rpcsvc/ypclnt.h> 71 #include <rpcsvc/yp_prot.h> 72 #endif 73 74 #ifdef __weak_alias 75 __weak_alias(endusershell,_endusershell) 76 __weak_alias(getusershell,_getusershell) 77 __weak_alias(setusershell,_setusershell) 78 #endif 79 80 /* 81 * Local shells should NOT be added here. They should be added in 82 * /etc/shells. 83 */ 84 85 static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; 86 static const char *const *curshell; 87 static StringList *sl; 88 89 static const char *const *initshells __P((void)); 90 91 /* 92 * Get a list of shells from "shells" nsswitch database 93 */ 94 __aconst char * 95 getusershell() 96 { 97 __aconst char *ret; 98 99 if (curshell == NULL) 100 curshell = initshells(); 101 /*LINTED*/ 102 ret = (__aconst char *)*curshell; 103 if (ret != NULL) 104 curshell++; 105 return (ret); 106 } 107 108 void 109 endusershell() 110 { 111 if (sl) 112 sl_free(sl, 1); 113 sl = NULL; 114 curshell = NULL; 115 } 116 117 void 118 setusershell() 119 { 120 121 curshell = initshells(); 122 } 123 124 125 static int _local_initshells __P((void *, void *, va_list)); 126 127 /*ARGSUSED*/ 128 static int 129 _local_initshells(rv, cb_data, ap) 130 void *rv; 131 void *cb_data; 132 va_list ap; 133 { 134 char *sp, *cp; 135 FILE *fp; 136 char line[MAXPATHLEN + 2]; 137 138 if (sl) 139 sl_free(sl, 1); 140 sl = sl_init(); 141 if (!sl) 142 return (NS_UNAVAIL); 143 144 if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) 145 return (NS_UNAVAIL); 146 147 sp = cp = line; 148 while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { 149 while (*cp != '#' && *cp != '/' && *cp != '\0') 150 cp++; 151 if (*cp == '#' || *cp == '\0') 152 continue; 153 sp = cp; 154 while (!isspace((unsigned char) *cp) && *cp != '#' 155 && *cp != '\0') 156 cp++; 157 *cp++ = '\0'; 158 if (sl_add(sl, strdup(sp)) == -1) 159 return (NS_UNAVAIL); 160 } 161 (void)fclose(fp); 162 return (NS_SUCCESS); 163 } 164 165 #ifdef HESIOD 166 static int _dns_initshells __P((void *, void *, va_list)); 167 168 /*ARGSUSED*/ 169 static int 170 _dns_initshells(rv, cb_data, ap) 171 void *rv; 172 void *cb_data; 173 va_list ap; 174 { 175 char shellname[] = "shells-XXXXX"; 176 int hsindex, hpi, r; 177 char **hp; 178 void *context; 179 180 if (sl) 181 sl_free(sl, 1); 182 sl = sl_init(); 183 if (!sl) 184 return (NS_UNAVAIL); 185 186 r = NS_UNAVAIL; 187 if (hesiod_init(&context) == -1) 188 return (r); 189 190 for (hsindex = 0; ; hsindex++) { 191 snprintf(shellname, sizeof(shellname)-1, "shells-%d", hsindex); 192 hp = hesiod_resolve(context, shellname, "shells"); 193 if (hp == NULL) { 194 if (errno == ENOENT) { 195 if (hsindex == 0) 196 r = NS_NOTFOUND; 197 else 198 r = NS_SUCCESS; 199 } 200 break; 201 } else { 202 int bad = 0; 203 204 for (hpi = 0; hp[hpi]; hpi++) 205 if (sl_add(sl, hp[hpi]) == -1) { 206 bad = 1; 207 break; 208 } 209 free(hp); 210 if (bad) 211 break; 212 } 213 } 214 hesiod_end(context); 215 return (r); 216 } 217 #endif /* HESIOD */ 218 219 #ifdef YP 220 static int _nis_initshells __P((void *, void *, va_list)); 221 222 /*ARGSUSED*/ 223 static int 224 _nis_initshells(rv, cb_data, ap) 225 void *rv; 226 void *cb_data; 227 va_list ap; 228 { 229 static char *ypdomain; 230 231 if (sl) 232 sl_free(sl, 1); 233 sl = sl_init(); 234 if (!sl) 235 return (NS_UNAVAIL); 236 237 if (ypdomain == NULL) { 238 switch (yp_get_default_domain(&ypdomain)) { 239 case 0: 240 break; 241 case YPERR_RESRC: 242 return (NS_TRYAGAIN); 243 default: 244 return (NS_UNAVAIL); 245 } 246 } 247 248 for (;;) { 249 char *ypcur = NULL; 250 int ypcurlen = 0; /* XXX: GCC */ 251 char *key, *data; 252 int keylen, datalen; 253 int r; 254 255 key = data = NULL; 256 if (ypcur) { 257 r = yp_next(ypdomain, "shells", ypcur, ypcurlen, 258 &key, &keylen, &data, &datalen); 259 free(ypcur); 260 switch (r) { 261 case 0: 262 break; 263 case YPERR_NOMORE: 264 free(key); 265 free(data); 266 return (NS_SUCCESS); 267 default: 268 free(key); 269 free(data); 270 return (NS_UNAVAIL); 271 } 272 ypcur = key; 273 ypcurlen = keylen; 274 } else { 275 if (yp_first(ypdomain, "shells", &ypcur, 276 &ypcurlen, &data, &datalen)) { 277 free(data); 278 return (NS_UNAVAIL); 279 } 280 } 281 data[datalen] = '\0'; /* clear trailing \n */ 282 if (sl_add(sl, data) == -1) 283 return (NS_UNAVAIL); 284 } 285 } 286 #endif /* YP */ 287 288 static const char *const * 289 initshells() 290 { 291 static const ns_dtab dtab[] = { 292 NS_FILES_CB(_local_initshells, NULL) 293 NS_DNS_CB(_dns_initshells, NULL) 294 NS_NIS_CB(_nis_initshells, NULL) 295 { 0 } 296 }; 297 if (sl) 298 sl_free(sl, 1); 299 sl = sl_init(); 300 if (!sl) 301 goto badinitshells; 302 303 if (nsdispatch(NULL, dtab, NSDB_SHELLS, "initshells", __nsdefaultsrc) 304 != NS_SUCCESS) { 305 badinitshells: 306 if (sl) 307 sl_free(sl, 1); 308 sl = NULL; 309 return (okshells); 310 } 311 if (sl_add(sl, NULL) == -1) 312 goto badinitshells; 313 314 return (const char *const *)(sl->sl_str); 315 } 316
Indexes created Mon Sep 22 05:09:51 GMT 2025