1/* $NetBSD: getusershell.c,v 1.17 1999/01/25 01:09:34 lukem 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 --- 15 unchanged lines hidden (view full) --- 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) |
38static char rcsid[] = 39 "$FreeBSD: head/lib/libc/gen/getusershell.c 65532 2000-09-06 18:16:48Z nectar $"; |
40#endif /* LIBC_SCCS and not lint */ 41 42#include <sys/param.h> 43#include <sys/file.h> |
44 |
45#include <ctype.h> |
46#include <errno.h> 47#include <nsswitch.h> 48#include <paths.h> 49#include <stdio.h> |
50#include <stdlib.h> |
51#include <string.h> 52#include <stringlist.h> |
53#include <unistd.h> |
54 |
55#ifdef HESIOD 56#include <hesiod.h> 57#endif 58#ifdef YP 59#include <rpc/rpc.h> 60#include <rpcsvc/ypclnt.h> 61#include <rpcsvc/yp_prot.h> 62#endif 63 |
64/* 65 * Local shells should NOT be added here. They should be added in 66 * /etc/shells. 67 */ 68 |
69static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; 70static const char *const *curshell; 71static StringList *sl; |
72 |
73static const char *const *initshells __P((void)); 74 |
75/* |
76 * Get a list of shells from "shells" nsswitch database |
77 */ 78char * |
79getusershell(void) |
80{ 81 char *ret; 82 83 if (curshell == NULL) 84 curshell = initshells(); |
85 /*LINTED*/ 86 ret = (char *)*curshell; |
87 if (ret != NULL) 88 curshell++; 89 return (ret); 90} 91 92void |
93endusershell(void) |
94{ |
95 if (sl) 96 sl_free(sl, 1); 97 sl = NULL; |
98 curshell = NULL; 99} 100 101void |
102setusershell(void) |
103{ 104 105 curshell = initshells(); 106} 107 |
108 109static int _local_initshells __P((void *, void *, va_list)); 110 111/*ARGSUSED*/ 112static int 113_local_initshells(rv, cb_data, ap) 114 void *rv; 115 void *cb_data; 116 va_list ap; |
117{ |
118 char *sp, *cp; 119 FILE *fp; 120 char line[MAXPATHLEN + 2]; |
121 |
122 if (sl) 123 sl_free(sl, 1); 124 sl = sl_init(); 125 |
126 if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) |
127 return NS_UNAVAIL; 128 129 sp = cp = line; |
130 while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { 131 while (*cp != '#' && *cp != '/' && *cp != '\0') 132 cp++; 133 if (*cp == '#' || *cp == '\0') 134 continue; |
135 sp = cp; 136 while (!isspace(*cp) && *cp != '#' && *cp != '\0') |
137 cp++; 138 *cp++ = '\0'; |
139 sl_add(sl, strdup(sp)); |
140 } |
141 (void)fclose(fp); |
142 return NS_SUCCESS; |
143} |
144 145#ifdef HESIOD 146static int _dns_initshells __P((void *, void *, va_list)); 147 148/*ARGSUSED*/ 149static int 150_dns_initshells(rv, cb_data, ap) 151 void *rv; 152 void *cb_data; 153 va_list ap; 154{ 155 char shellname[] = "shells-XXXXX"; 156 int hsindex, hpi, r; 157 char **hp; 158 void *context; 159 160 if (sl) 161 sl_free(sl, 1); 162 sl = sl_init(); 163 r = NS_UNAVAIL; 164 if (hesiod_init(&context) == -1) 165 return (r); 166 167 for (hsindex = 0; ; hsindex++) { 168 snprintf(shellname, sizeof(shellname)-1, "shells-%d", hsindex); 169 hp = hesiod_resolve(context, shellname, "shells"); 170 if (hp == NULL) { 171 if (errno == ENOENT) { 172 if (hsindex == 0) 173 r = NS_NOTFOUND; 174 else 175 r = NS_SUCCESS; 176 } 177 break; 178 } else { 179 for (hpi = 0; hp[hpi]; hpi++) 180 sl_add(sl, hp[hpi]); 181 free(hp); 182 } 183 } 184 hesiod_end(context); 185 return (r); 186} 187#endif /* HESIOD */ 188 189#ifdef YP 190static int _nis_initshells __P((void *, void *, va_list)); 191 192/*ARGSUSED*/ 193static int 194_nis_initshells(rv, cb_data, ap) 195 void *rv; 196 void *cb_data; 197 va_list ap; 198{ 199 static char *ypdomain; 200 201 if (sl) 202 sl_free(sl, 1); 203 sl = sl_init(); 204 205 if (ypdomain == NULL) { 206 switch (yp_get_default_domain(&ypdomain)) { 207 case 0: 208 break; 209 case YPERR_RESRC: 210 return NS_TRYAGAIN; 211 default: 212 return NS_UNAVAIL; 213 } 214 } 215 216 for (;;) { 217 char *ypcur = NULL; 218 int ypcurlen = 0; /* XXX: GCC */ 219 char *key, *data; 220 int keylen, datalen; 221 int r; 222 223 key = data = NULL; 224 if (ypcur) { 225 r = yp_next(ypdomain, "shells", ypcur, ypcurlen, 226 &key, &keylen, &data, &datalen); 227 free(ypcur); 228 switch (r) { 229 case 0: 230 break; 231 case YPERR_NOMORE: 232 free(key); 233 free(data); 234 return NS_SUCCESS; 235 default: 236 free(key); 237 free(data); 238 return NS_UNAVAIL; 239 } 240 ypcur = key; 241 ypcurlen = keylen; 242 } else { 243 if (yp_first(ypdomain, "shells", &ypcur, 244 &ypcurlen, &data, &datalen)) { 245 free(data); 246 return NS_UNAVAIL; 247 } 248 } 249 data[datalen] = '\0'; /* clear trailing \n */ 250 sl_add(sl, data); 251 } 252} 253#endif /* YP */ 254 255static const char *const * 256initshells() 257{ 258 static const ns_dtab dtab[] = { 259 NS_FILES_CB(_local_initshells, NULL) 260 NS_DNS_CB(_dns_initshells, NULL) 261 NS_NIS_CB(_nis_initshells, NULL) 262 { 0 } 263 }; 264 if (sl) 265 sl_free(sl, 1); 266 sl = sl_init(); 267 268 if (nsdispatch(NULL, dtab, NSDB_SHELLS, "initshells", __nsdefaultsrc) 269 != NS_SUCCESS) { 270 if (sl) 271 sl_free(sl, 1); 272 sl = NULL; 273 return (okshells); 274 } 275 sl_add(sl, NULL); 276 277 return (const char *const *)(sl->sl_str); 278} |