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glibc/misc/getusershell.c
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/* | |
* Copyright (c) 1985, 1993 | |
* The Regents of the University of California. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* 4. Neither the name of the University nor the names of its contributors | |
* may be used to endorse or promote products derived from this software | |
* without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
* SUCH DAMAGE. | |
*/ | |
#if defined(LIBC_SCCS) && !defined(lint) | |
static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93"; | |
#endif /* LIBC_SCCS and not lint */ | |
#include <sys/param.h> | |
#include <sys/file.h> | |
#include <sys/stat.h> | |
#include <stdio.h> | |
#include <stdio_ext.h> | |
#include <ctype.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
#include <paths.h> | |
/* | |
* Local shells should NOT be added here. They should be added in | |
* /etc/shells. | |
*/ | |
/* NB: we do not initialize okshells here. The initialization needs | |
relocations. These interfaces are used so rarely that this is not | |
justified. Instead explicitly initialize the array when it is | |
used. */ | |
#if 0 | |
static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; | |
#else | |
static const char *okshells[3]; | |
#endif | |
static char **curshell, **shells, *strings; | |
static char **initshells (void) __THROW; | |
/* | |
* Get a list of shells from _PATH_SHELLS, if it exists. | |
*/ | |
char * | |
getusershell (void) | |
{ | |
char *ret; | |
if (curshell == NULL) | |
curshell = initshells(); | |
ret = *curshell; | |
if (ret != NULL) | |
curshell++; | |
return (ret); | |
} | |
void | |
endusershell (void) | |
{ | |
free(shells); | |
shells = NULL; | |
free(strings); | |
strings = NULL; | |
curshell = NULL; | |
} | |
void | |
setusershell (void) | |
{ | |
curshell = initshells(); | |
} | |
static char ** | |
initshells (void) | |
{ | |
char **sp, *cp; | |
FILE *fp; | |
struct stat64 statb; | |
size_t flen; | |
free(shells); | |
shells = NULL; | |
free(strings); | |
strings = NULL; | |
if ((fp = fopen(_PATH_SHELLS, "rce")) == NULL) | |
goto init_okshells_noclose; | |
if (fstat64(fileno(fp), &statb) == -1) { | |
init_okshells: | |
(void)fclose(fp); | |
init_okshells_noclose: | |
okshells[0] = _PATH_BSHELL; | |
okshells[1] = _PATH_CSHELL; | |
return (char **) okshells; | |
} | |
if (statb.st_size > ~(size_t)0 / sizeof (char *) * 3) | |
goto init_okshells; | |
flen = statb.st_size + 3; | |
if ((strings = malloc(flen)) == NULL) | |
goto init_okshells; | |
shells = malloc(statb.st_size / 3 * sizeof (char *)); | |
if (shells == NULL) { | |
free(strings); | |
strings = NULL; | |
goto init_okshells; | |
} | |
sp = shells; | |
cp = strings; | |
while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) { | |
while (*cp != '#' && *cp != '/' && *cp != '\0') | |
cp++; | |
if (*cp == '#' || *cp == '\0' || cp[1] == '\0') | |
continue; | |
*sp++ = cp; | |
while (!isspace(*cp) && *cp != '#' && *cp != '\0') | |
cp++; | |
*cp++ = '\0'; | |
} | |
*sp = NULL; | |
(void)fclose(fp); | |
return (shells); | |
} |