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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/lib/libc/gen/getusershell.c,v 1.3.2.1 2001/03/05 09:17:52 obrien Exp $ 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93"; 38 static char rcsid[] = 39 "$FreeBSD: src/lib/libc/gen/getusershell.c,v 1.3.2.1 2001/03/05 09:17:52 obrien Exp $"; 40 #endif /* LIBC_SCCS and not lint */ 41 42 #include <sys/param.h> 43 #include <sys/file.h> 44 #include <sys/stat.h> 45 46 #include <ctype.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <paths.h> 51 52 /* 53 * Local shells should NOT be added here. They should be added in 54 * /etc/shells. 55 */ 56 57 static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; 58 static char **curshell, **shells, *strings; 59 static char **initshells __P((void)); 60 61 /* 62 * Get a list of shells from _PATH_SHELLS, if it exists. 63 */ 64 char * 65 getusershell(void) 66 { 67 char *ret; 68 69 if (curshell == NULL) 70 curshell = initshells(); 71 ret = *curshell; 72 if (ret != NULL) 73 curshell++; 74 return (ret); 75 } 76 77 void 78 endusershell(void) 79 { 80 81 if (shells != NULL) 82 free(shells); 83 shells = NULL; 84 if (strings != NULL) 85 free(strings); 86 strings = NULL; 87 curshell = NULL; 88 } 89 90 void 91 setusershell(void) 92 { 93 94 curshell = initshells(); 95 } 96 97 static char ** 98 initshells() 99 { 100 char **sp, *cp; 101 FILE *fp; 102 struct stat statb; 103 104 if (shells != NULL) 105 free(shells); 106 shells = NULL; 107 if (strings != NULL) 108 free(strings); 109 strings = NULL; 110 if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) 111 return (okshells); 112 if (fstat(fileno(fp), &statb) == -1) { 113 (void)fclose(fp); 114 return (okshells); 115 } 116 if ((strings = malloc((u_int)statb.st_size)) == NULL) { 117 (void)fclose(fp); 118 return (okshells); 119 } 120 shells = calloc((unsigned)statb.st_size / 3, sizeof (char *)); 121 if (shells == NULL) { 122 (void)fclose(fp); 123 free(strings); 124 strings = NULL; 125 return (okshells); 126 } 127 sp = shells; 128 cp = strings; 129 while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { 130 while (*cp != '#' && *cp != '/' && *cp != '\0') 131 cp++; 132 if (*cp == '#' || *cp == '\0') 133 continue; 134 *sp++ = cp; 135 while (!isspace((unsigned char)*cp) && *cp != '#' && *cp != '\0') 136 cp++; 137 *cp++ = '\0'; 138 } 139 *sp = NULL; 140 (void)fclose(fp); 141 return (shells); 142 } 143