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1078 lines
25 KiB
C
1078 lines
25 KiB
C
/* vi: set sw=4 ts=4: */
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/* Copyright (C) 2003 Manuel Novoa III
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*
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* Licensed under GPL v2, or later. See file LICENSE in this tarball.
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*/
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/* Nov 6, 2003 Initial version.
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*
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* NOTE: This implementation is quite strict about requiring all
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* field seperators. It also does not allow leading whitespace
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* except when processing the numeric fields. glibc is more
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* lenient. See the various glibc difference comments below.
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*
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* TODO:
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* Move to dynamic allocation of (currently statically allocated)
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* buffers; especially for the group-related functions since
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* large group member lists will cause error returns.
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*
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*/
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#include "libbb.h"
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#include <features.h>
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#include <assert.h>
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#ifndef _PATH_SHADOW
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#define _PATH_SHADOW "/etc/shadow"
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#endif
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#ifndef _PATH_PASSWD
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#define _PATH_PASSWD "/etc/passwd"
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#endif
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#ifndef _PATH_GROUP
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#define _PATH_GROUP "/etc/group"
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#endif
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/**********************************************************************/
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/* Sizes for statically allocated buffers. */
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/* If you change these values, also change _SC_GETPW_R_SIZE_MAX and
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* _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */
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#define PWD_BUFFER_SIZE 256
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#define GRP_BUFFER_SIZE 256
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/**********************************************************************/
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/* Prototypes for internal functions. */
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static int bb__pgsreader(int (*parserfunc)(void *d, char *line), void *data,
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char *__restrict line_buff, size_t buflen, FILE *f);
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static int bb__parsepwent(void *pw, char *line);
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static int bb__parsegrent(void *gr, char *line);
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#if ENABLE_USE_BB_SHADOW
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static int bb__parsespent(void *sp, char *line);
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#endif
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/**********************************************************************/
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/* We avoid having big global data. */
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struct statics {
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/* Smaller things first */
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struct passwd getpwuid_resultbuf;
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struct group getgrgid_resultbuf;
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struct passwd getpwnam_resultbuf;
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struct group getgrnam_resultbuf;
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char getpwuid_buffer[PWD_BUFFER_SIZE];
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char getgrgid_buffer[GRP_BUFFER_SIZE];
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char getpwnam_buffer[PWD_BUFFER_SIZE];
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char getgrnam_buffer[GRP_BUFFER_SIZE];
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#if 0
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struct passwd fgetpwent_resultbuf;
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struct group fgetgrent_resultbuf;
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struct spwd fgetspent_resultbuf;
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char fgetpwent_buffer[PWD_BUFFER_SIZE];
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char fgetgrent_buffer[GRP_BUFFER_SIZE];
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char fgetspent_buffer[PWD_BUFFER_SIZE];
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#endif
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#if 0 //ENABLE_USE_BB_SHADOW
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struct spwd getspuid_resultbuf;
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struct spwd getspnam_resultbuf;
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char getspuid_buffer[PWD_BUFFER_SIZE];
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char getspnam_buffer[PWD_BUFFER_SIZE];
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#endif
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// Not converted - too small to bother
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//pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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//FILE *pwf /*= NULL*/;
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//FILE *grf /*= NULL*/;
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//FILE *spf /*= NULL*/;
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#if 0
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struct passwd getpwent_pwd;
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struct group getgrent_gr;
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char getpwent_line_buff[PWD_BUFFER_SIZE];
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char getgrent_line_buff[GRP_BUFFER_SIZE];
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#endif
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#if 0 //ENABLE_USE_BB_SHADOW
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struct spwd getspent_spwd;
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struct spwd sgetspent_spwd;
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char getspent_line_buff[PWD_BUFFER_SIZE];
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char sgetspent_line_buff[PWD_BUFFER_SIZE];
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#endif
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};
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static struct statics *ptr_to_statics;
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static struct statics *get_S(void)
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{
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if (!ptr_to_statics)
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ptr_to_statics = xzalloc(sizeof(*ptr_to_statics));
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return ptr_to_statics;
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}
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/* Always use in this order, get_S() must be called first */
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#define RESULTBUF(name) &((S = get_S())->name##_resultbuf)
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#define BUFFER(name) (S->name##_buffer)
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/**********************************************************************/
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/* For the various fget??ent_r funcs, return
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*
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* 0: success
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* ENOENT: end-of-file encountered
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* ERANGE: buflen too small
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* other error values possible. See bb__pgsreader.
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*
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* Also, *result == resultbuf on success and NULL on failure.
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*
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* NOTE: glibc difference - For the ENOENT case, glibc also sets errno.
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* We do not, as it really isn't an error if we reach the end-of-file.
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* Doing so is analogous to having fgetc() set errno on EOF.
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*/
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/**********************************************************************/
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int fgetpwent_r(FILE *__restrict stream, struct passwd *__restrict resultbuf,
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char *__restrict buffer, size_t buflen,
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struct passwd **__restrict result)
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{
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int rv;
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*result = NULL;
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rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, stream);
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if (!rv) {
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*result = resultbuf;
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}
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return rv;
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}
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int fgetgrent_r(FILE *__restrict stream, struct group *__restrict resultbuf,
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char *__restrict buffer, size_t buflen,
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struct group **__restrict result)
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{
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int rv;
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*result = NULL;
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rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, stream);
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if (!rv) {
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*result = resultbuf;
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}
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return rv;
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}
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#if ENABLE_USE_BB_SHADOW
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int fgetspent_r(FILE *__restrict stream, struct spwd *__restrict resultbuf,
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char *__restrict buffer, size_t buflen,
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struct spwd **__restrict result)
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{
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int rv;
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*result = NULL;
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rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, stream);
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if (!rv) {
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*result = resultbuf;
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}
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return rv;
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}
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#endif
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/**********************************************************************/
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/* For the various fget??ent funcs, return NULL on failure and a
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* pointer to the appropriate struct (statically allocated) on success.
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* TODO: audit & stop using these in bbox, they pull in static buffers */
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/**********************************************************************/
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#if 0
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struct passwd *fgetpwent(FILE *stream)
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{
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struct statics *S;
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struct passwd *resultbuf = RESULTBUF(fgetpwent);
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char *buffer = BUFFER(fgetpwent);
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struct passwd *result;
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fgetpwent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetpwent)), &result);
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return result;
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}
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struct group *fgetgrent(FILE *stream)
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{
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struct statics *S;
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struct group *resultbuf = RESULTBUF(fgetgrent);
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char *buffer = BUFFER(fgetgrent);
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struct group *result;
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fgetgrent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetgrent)), &result);
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return result;
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}
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#endif
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#if ENABLE_USE_BB_SHADOW
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#if 0
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struct spwd *fgetspent(FILE *stream)
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{
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struct statics *S;
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struct spwd *resultbuf = RESULTBUF(fgetspent);
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char *buffer = BUFFER(fgetspent);
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struct spwd *result;
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fgetspent_r(stream, resultbuf, buffer, sizeof(BUFFER(fgetspent)), &result);
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return result;
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}
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#endif
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int sgetspent_r(const char *string, struct spwd *result_buf,
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char *buffer, size_t buflen, struct spwd **result)
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{
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int rv = ERANGE;
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*result = NULL;
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if (buflen < PWD_BUFFER_SIZE) {
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DO_ERANGE:
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errno=rv;
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goto DONE;
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}
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if (string != buffer) {
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if (strlen(string) >= buflen) {
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goto DO_ERANGE;
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}
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strcpy(buffer, string);
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}
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rv = bb__parsespent(result_buf, buffer);
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if (!rv) {
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*result = result_buf;
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}
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DONE:
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return rv;
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}
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#endif
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/**********************************************************************/
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#define GETXXKEY_R_FUNC getpwnam_r
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#define GETXXKEY_R_PARSER bb__parsepwent
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#define GETXXKEY_R_ENTTYPE struct passwd
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#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->pw_name, key))
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#define GETXXKEY_R_KEYTYPE const char *__restrict
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#define GETXXKEY_R_PATHNAME _PATH_PASSWD
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#include "pwd_grp_internal.c"
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#define GETXXKEY_R_FUNC getgrnam_r
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#define GETXXKEY_R_PARSER bb__parsegrent
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#define GETXXKEY_R_ENTTYPE struct group
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#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->gr_name, key))
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#define GETXXKEY_R_KEYTYPE const char *__restrict
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#define GETXXKEY_R_PATHNAME _PATH_GROUP
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#include "pwd_grp_internal.c"
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#if ENABLE_USE_BB_SHADOW
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#define GETXXKEY_R_FUNC getspnam_r
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#define GETXXKEY_R_PARSER bb__parsespent
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#define GETXXKEY_R_ENTTYPE struct spwd
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#define GETXXKEY_R_TEST(ENT) (!strcmp((ENT)->sp_namp, key))
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#define GETXXKEY_R_KEYTYPE const char *__restrict
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#define GETXXKEY_R_PATHNAME _PATH_SHADOW
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#include "pwd_grp_internal.c"
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#endif
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#define GETXXKEY_R_FUNC getpwuid_r
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#define GETXXKEY_R_PARSER bb__parsepwent
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#define GETXXKEY_R_ENTTYPE struct passwd
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#define GETXXKEY_R_TEST(ENT) ((ENT)->pw_uid == key)
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#define GETXXKEY_R_KEYTYPE uid_t
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#define GETXXKEY_R_PATHNAME _PATH_PASSWD
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#include "pwd_grp_internal.c"
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#define GETXXKEY_R_FUNC getgrgid_r
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#define GETXXKEY_R_PARSER bb__parsegrent
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#define GETXXKEY_R_ENTTYPE struct group
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#define GETXXKEY_R_TEST(ENT) ((ENT)->gr_gid == key)
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#define GETXXKEY_R_KEYTYPE gid_t
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#define GETXXKEY_R_PATHNAME _PATH_GROUP
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#include "pwd_grp_internal.c"
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/**********************************************************************/
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/* TODO: audit & stop using these in bbox, they pull in static buffers */
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/* This one has many users */
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struct passwd *getpwuid(uid_t uid)
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{
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struct statics *S;
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struct passwd *resultbuf = RESULTBUF(getpwuid);
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char *buffer = BUFFER(getpwuid);
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struct passwd *result;
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getpwuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getpwuid)), &result);
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return result;
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}
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/* This one has many users */
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struct group *getgrgid(gid_t gid)
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{
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struct statics *S;
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struct group *resultbuf = RESULTBUF(getgrgid);
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char *buffer = BUFFER(getgrgid);
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struct group *result;
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getgrgid_r(gid, resultbuf, buffer, sizeof(BUFFER(getgrgid)), &result);
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return result;
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}
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#if 0 //ENABLE_USE_BB_SHADOW
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/* This function is non-standard and is currently not built. It seems
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* to have been created as a reentrant version of the non-standard
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* functions getspuid. Why getspuid was added, I do not know. */
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int getspuid_r(uid_t uid, struct spwd *__restrict resultbuf,
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char *__restrict buffer, size_t buflen,
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struct spwd **__restrict result)
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{
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int rv;
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struct passwd *pp;
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struct passwd password;
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char pwd_buff[PWD_BUFFER_SIZE];
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*result = NULL;
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rv = getpwuid_r(uid, &password, pwd_buff, sizeof(pwd_buff), &pp);
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if (!rv) {
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rv = getspnam_r(password.pw_name, resultbuf, buffer, buflen, result);
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}
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return rv;
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}
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/* This function is non-standard and is currently not built.
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* Why it was added, I do not know. */
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struct spwd *getspuid(uid_t uid)
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{
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struct statics *S;
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struct spwd *resultbuf = RESULTBUF(getspuid);
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char *buffer = BUFFER(getspuid);
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struct spwd *result;
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getspuid_r(uid, resultbuf, buffer, sizeof(BUFFER(getspuid)), &result);
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return result;
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}
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#endif
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/* This one has many users */
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struct passwd *getpwnam(const char *name)
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{
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struct statics *S;
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struct passwd *resultbuf = RESULTBUF(getpwnam);
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char *buffer = BUFFER(getpwnam);
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struct passwd *result;
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getpwnam_r(name, resultbuf, buffer, sizeof(BUFFER(getpwnam)), &result);
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return result;
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}
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/* This one has many users */
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struct group *getgrnam(const char *name)
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{
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struct statics *S;
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struct group *resultbuf = RESULTBUF(getgrnam);
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char *buffer = BUFFER(getgrnam);
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struct group *result;
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getgrnam_r(name, resultbuf, buffer, sizeof(BUFFER(getgrnam)), &result);
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return result;
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}
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#if 0 //ENABLE_USE_BB_SHADOW
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struct spwd *getspnam(const char *name)
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{
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struct statics *S;
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struct spwd *resultbuf = RESULTBUF(getspnam);
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char *buffer = BUFFER(getspnam);
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struct spwd *result;
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getspnam_r(name, resultbuf, buffer, sizeof(BUFFER(getspnam)), &result);
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return result;
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}
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#endif
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#ifdef THIS_ONE_IS_UNUSED
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/* This one doesn't use static buffers */
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int getpw(uid_t uid, char *buf)
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{
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struct passwd resultbuf;
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struct passwd *result;
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char buffer[PWD_BUFFER_SIZE];
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if (!buf) {
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errno = EINVAL;
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} else if (!getpwuid_r(uid, &resultbuf, buffer, sizeof(buffer), &result)) {
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if (sprintf(buf, "%s:%s:%lu:%lu:%s:%s:%s\n",
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resultbuf.pw_name, resultbuf.pw_passwd,
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(unsigned long)(resultbuf.pw_uid),
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(unsigned long)(resultbuf.pw_gid),
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resultbuf.pw_gecos, resultbuf.pw_dir,
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resultbuf.pw_shell) >= 0
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) {
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return 0;
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}
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}
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return -1;
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}
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#endif
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/**********************************************************************/
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/* FIXME: we don't have such CONFIG_xx - ?! */
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#if defined CONFIG_USE_BB_THREADSAFE_SHADOW && defined PTHREAD_MUTEX_INITIALIZER
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static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
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# define LOCK pthread_mutex_lock(&mylock)
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# define UNLOCK pthread_mutex_unlock(&mylock);
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#else
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# define LOCK ((void) 0)
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# define UNLOCK ((void) 0)
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#endif
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static FILE *pwf /*= NULL*/;
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void setpwent(void)
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{
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LOCK;
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if (pwf) {
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rewind(pwf);
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}
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UNLOCK;
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}
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void endpwent(void)
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{
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LOCK;
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if (pwf) {
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fclose(pwf);
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pwf = NULL;
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}
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UNLOCK;
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}
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|
|
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int getpwent_r(struct passwd *__restrict resultbuf,
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char *__restrict buffer, size_t buflen,
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struct passwd **__restrict result)
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{
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int rv;
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LOCK;
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*result = NULL; /* In case of error... */
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if (!pwf) {
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pwf = fopen_for_read(_PATH_PASSWD);
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if (!pwf) {
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rv = errno;
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goto ERR;
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}
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}
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rv = bb__pgsreader(bb__parsepwent, resultbuf, buffer, buflen, pwf);
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if (!rv) {
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*result = resultbuf;
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}
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ERR:
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UNLOCK;
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return rv;
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}
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|
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static FILE *grf /*= NULL*/;
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void setgrent(void)
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{
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LOCK;
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if (grf) {
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rewind(grf);
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}
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UNLOCK;
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}
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|
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void endgrent(void)
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{
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LOCK;
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if (grf) {
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fclose(grf);
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grf = NULL;
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}
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UNLOCK;
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}
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|
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int getgrent_r(struct group *__restrict resultbuf,
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char *__restrict buffer, size_t buflen,
|
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struct group **__restrict result)
|
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{
|
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int rv;
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LOCK;
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*result = NULL; /* In case of error... */
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|
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if (!grf) {
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grf = fopen_for_read(_PATH_GROUP);
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if (!grf) {
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rv = errno;
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goto ERR;
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}
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}
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|
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rv = bb__pgsreader(bb__parsegrent, resultbuf, buffer, buflen, grf);
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if (!rv) {
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*result = resultbuf;
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}
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|
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ERR:
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UNLOCK;
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return rv;
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}
|
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|
|
#if ENABLE_USE_BB_SHADOW
|
|
static FILE *spf /*= NULL*/;
|
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void setspent(void)
|
|
{
|
|
LOCK;
|
|
if (spf) {
|
|
rewind(spf);
|
|
}
|
|
UNLOCK;
|
|
}
|
|
|
|
void endspent(void)
|
|
{
|
|
LOCK;
|
|
if (spf) {
|
|
fclose(spf);
|
|
spf = NULL;
|
|
}
|
|
UNLOCK;
|
|
}
|
|
|
|
int getspent_r(struct spwd *resultbuf, char *buffer,
|
|
size_t buflen, struct spwd **result)
|
|
{
|
|
int rv;
|
|
|
|
LOCK;
|
|
*result = NULL; /* In case of error... */
|
|
|
|
if (!spf) {
|
|
spf = fopen_for_read(_PATH_SHADOW);
|
|
if (!spf) {
|
|
rv = errno;
|
|
goto ERR;
|
|
}
|
|
}
|
|
|
|
rv = bb__pgsreader(bb__parsespent, resultbuf, buffer, buflen, spf);
|
|
if (!rv) {
|
|
*result = resultbuf;
|
|
}
|
|
|
|
ERR:
|
|
UNLOCK;
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
#if 0
|
|
struct passwd *getpwent(void)
|
|
{
|
|
static char line_buff[PWD_BUFFER_SIZE];
|
|
static struct passwd pwd;
|
|
struct passwd *result;
|
|
|
|
getpwent_r(&pwd, line_buff, sizeof(line_buff), &result);
|
|
return result;
|
|
}
|
|
|
|
struct group *getgrent(void)
|
|
{
|
|
static char line_buff[GRP_BUFFER_SIZE];
|
|
static struct group gr;
|
|
struct group *result;
|
|
|
|
getgrent_r(&gr, line_buff, sizeof(line_buff), &result);
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
#if 0 //ENABLE_USE_BB_SHADOW
|
|
struct spwd *getspent(void)
|
|
{
|
|
static char line_buff[PWD_BUFFER_SIZE];
|
|
static struct spwd spwd;
|
|
struct spwd *result;
|
|
|
|
getspent_r(&spwd, line_buff, sizeof(line_buff), &result);
|
|
return result;
|
|
}
|
|
|
|
struct spwd *sgetspent(const char *string)
|
|
{
|
|
static char line_buff[PWD_BUFFER_SIZE];
|
|
static struct spwd spwd;
|
|
struct spwd *result;
|
|
|
|
sgetspent_r(string, &spwd, line_buff, sizeof(line_buff), &result);
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
static gid_t *getgrouplist_internal(int *ngroups_ptr, const char *user, gid_t gid)
|
|
{
|
|
FILE *grfile;
|
|
gid_t *group_list;
|
|
int ngroups;
|
|
struct group group;
|
|
char buff[PWD_BUFFER_SIZE];
|
|
|
|
/* We alloc space for 8 gids at a time. */
|
|
group_list = xmalloc(8 * sizeof(group_list[0]));
|
|
group_list[0] = gid;
|
|
ngroups = 1;
|
|
|
|
grfile = fopen_for_read(_PATH_GROUP);
|
|
if (grfile) {
|
|
while (!bb__pgsreader(bb__parsegrent, &group, buff, sizeof(buff), grfile)) {
|
|
char **m;
|
|
assert(group.gr_mem); /* Must have at least a NULL terminator. */
|
|
if (group.gr_gid == gid)
|
|
continue;
|
|
for (m = group.gr_mem; *m; m++) {
|
|
if (strcmp(*m, user) != 0)
|
|
continue;
|
|
group_list = xrealloc_vector(group_list, 3, ngroups);
|
|
group_list[ngroups++] = group.gr_gid;
|
|
break;
|
|
}
|
|
}
|
|
fclose(grfile);
|
|
}
|
|
*ngroups_ptr = ngroups;
|
|
return group_list;
|
|
}
|
|
|
|
int initgroups(const char *user, gid_t gid)
|
|
{
|
|
int ngroups;
|
|
gid_t *group_list = getgrouplist_internal(&ngroups, user, gid);
|
|
|
|
ngroups = setgroups(ngroups, group_list);
|
|
free(group_list);
|
|
return ngroups;
|
|
}
|
|
|
|
int getgrouplist(const char *user, gid_t gid, gid_t *groups, int *ngroups)
|
|
{
|
|
int ngroups_old = *ngroups;
|
|
gid_t *group_list = getgrouplist_internal(ngroups, user, gid);
|
|
|
|
if (*ngroups <= ngroups_old) {
|
|
ngroups_old = *ngroups;
|
|
memcpy(groups, group_list, ngroups_old * sizeof(groups[0]));
|
|
} else {
|
|
ngroups_old = -1;
|
|
}
|
|
free(group_list);
|
|
return ngroups_old;
|
|
}
|
|
|
|
int putpwent(const struct passwd *__restrict p, FILE *__restrict f)
|
|
{
|
|
int rv = -1;
|
|
|
|
if (!p || !f) {
|
|
errno = EINVAL;
|
|
} else {
|
|
/* No extra thread locking is needed above what fprintf does. */
|
|
if (fprintf(f, "%s:%s:%lu:%lu:%s:%s:%s\n",
|
|
p->pw_name, p->pw_passwd,
|
|
(unsigned long)(p->pw_uid),
|
|
(unsigned long)(p->pw_gid),
|
|
p->pw_gecos, p->pw_dir, p->pw_shell) >= 0
|
|
) {
|
|
rv = 0;
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
int putgrent(const struct group *__restrict p, FILE *__restrict f)
|
|
{
|
|
static const char format[] ALIGN1 = ",%s";
|
|
|
|
char **m;
|
|
const char *fmt;
|
|
int rv = -1;
|
|
|
|
if (!p || !f) { /* Sigh... glibc checks. */
|
|
errno = EINVAL;
|
|
} else {
|
|
if (fprintf(f, "%s:%s:%lu:",
|
|
p->gr_name, p->gr_passwd,
|
|
(unsigned long)(p->gr_gid)) >= 0
|
|
) {
|
|
|
|
fmt = format + 1;
|
|
|
|
assert(p->gr_mem);
|
|
m = p->gr_mem;
|
|
|
|
do {
|
|
if (!*m) {
|
|
if (fputc('\n', f) >= 0) {
|
|
rv = 0;
|
|
}
|
|
break;
|
|
}
|
|
if (fprintf(f, fmt, *m) < 0) {
|
|
break;
|
|
}
|
|
++m;
|
|
fmt = format;
|
|
} while (1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
#if ENABLE_USE_BB_SHADOW
|
|
static const unsigned char _sp_off[] ALIGN1 = {
|
|
offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */
|
|
offsetof(struct spwd, sp_min), /* 3 - not a char ptr */
|
|
offsetof(struct spwd, sp_max), /* 4 - not a char ptr */
|
|
offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */
|
|
offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */
|
|
offsetof(struct spwd, sp_expire) /* 7 - not a char ptr */
|
|
};
|
|
|
|
int putspent(const struct spwd *p, FILE *stream)
|
|
{
|
|
static const char ld_format[] ALIGN1 = "%ld:";
|
|
|
|
const char *f;
|
|
long x;
|
|
int i;
|
|
int rv = -1;
|
|
|
|
/* Unlike putpwent and putgrent, glibc does not check the args. */
|
|
if (fprintf(stream, "%s:%s:", p->sp_namp,
|
|
(p->sp_pwdp ? p->sp_pwdp : "")) < 0
|
|
) {
|
|
goto DO_UNLOCK;
|
|
}
|
|
|
|
for (i = 0; i < sizeof(_sp_off); i++) {
|
|
f = ld_format;
|
|
x = *(const long *)(((const char *) p) + _sp_off[i]);
|
|
if (x == -1) {
|
|
f += 3;
|
|
}
|
|
if (fprintf(stream, f, x) < 0) {
|
|
goto DO_UNLOCK;
|
|
}
|
|
}
|
|
|
|
if ((p->sp_flag != ~0UL) && (fprintf(stream, "%lu", p->sp_flag) < 0)) {
|
|
goto DO_UNLOCK;
|
|
}
|
|
|
|
if (fputc('\n', stream) > 0) {
|
|
rv = 0;
|
|
}
|
|
|
|
DO_UNLOCK:
|
|
return rv;
|
|
}
|
|
#endif
|
|
|
|
/**********************************************************************/
|
|
/* Internal uClibc functions. */
|
|
/**********************************************************************/
|
|
|
|
static const unsigned char pw_off[] ALIGN1 = {
|
|
offsetof(struct passwd, pw_name), /* 0 */
|
|
offsetof(struct passwd, pw_passwd), /* 1 */
|
|
offsetof(struct passwd, pw_uid), /* 2 - not a char ptr */
|
|
offsetof(struct passwd, pw_gid), /* 3 - not a char ptr */
|
|
offsetof(struct passwd, pw_gecos), /* 4 */
|
|
offsetof(struct passwd, pw_dir), /* 5 */
|
|
offsetof(struct passwd, pw_shell) /* 6 */
|
|
};
|
|
|
|
static int bb__parsepwent(void *data, char *line)
|
|
{
|
|
char *endptr;
|
|
char *p;
|
|
int i;
|
|
|
|
i = 0;
|
|
do {
|
|
p = ((char *) ((struct passwd *) data)) + pw_off[i];
|
|
|
|
if ((i & 6) ^ 2) { /* i!=2 and i!=3 */
|
|
*((char **) p) = line;
|
|
if (i==6) {
|
|
return 0;
|
|
}
|
|
/* NOTE: glibc difference - glibc allows omission of
|
|
* ':' seperators after the gid field if all remaining
|
|
* entries are empty. We require all separators. */
|
|
line = strchr(line, ':');
|
|
if (!line) {
|
|
break;
|
|
}
|
|
} else {
|
|
unsigned long t = strtoul(line, &endptr, 10);
|
|
/* Make sure we had at least one digit, and that the
|
|
* failing char is the next field seperator ':'. See
|
|
* glibc difference note above. */
|
|
/* TODO: Also check for leading whitespace? */
|
|
if ((endptr == line) || (*endptr != ':')) {
|
|
break;
|
|
}
|
|
line = endptr;
|
|
if (i & 1) { /* i == 3 -- gid */
|
|
*((gid_t *) p) = t;
|
|
} else { /* i == 2 -- uid */
|
|
*((uid_t *) p) = t;
|
|
}
|
|
}
|
|
|
|
*line++ = 0;
|
|
++i;
|
|
} while (1);
|
|
|
|
return -1;
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
static const unsigned char gr_off[] ALIGN1 = {
|
|
offsetof(struct group, gr_name), /* 0 */
|
|
offsetof(struct group, gr_passwd), /* 1 */
|
|
offsetof(struct group, gr_gid) /* 2 - not a char ptr */
|
|
};
|
|
|
|
static int bb__parsegrent(void *data, char *line)
|
|
{
|
|
char *endptr;
|
|
char *p;
|
|
int i;
|
|
char **members;
|
|
char *end_of_buf;
|
|
|
|
end_of_buf = ((struct group *) data)->gr_name; /* Evil hack! */
|
|
i = 0;
|
|
do {
|
|
p = ((char *) ((struct group *) data)) + gr_off[i];
|
|
|
|
if (i < 2) {
|
|
*((char **) p) = line;
|
|
line = strchr(line, ':');
|
|
if (!line) {
|
|
break;
|
|
}
|
|
*line++ = 0;
|
|
++i;
|
|
} else {
|
|
*((gid_t *) p) = strtoul(line, &endptr, 10);
|
|
|
|
/* NOTE: glibc difference - glibc allows omission of the
|
|
* trailing colon when there is no member list. We treat
|
|
* this as an error. */
|
|
|
|
/* Make sure we had at least one digit, and that the
|
|
* failing char is the next field seperator ':'. See
|
|
* glibc difference note above. */
|
|
if ((endptr == line) || (*endptr != ':')) {
|
|
break;
|
|
}
|
|
|
|
i = 1; /* Count terminating NULL ptr. */
|
|
p = endptr;
|
|
|
|
if (p[1]) { /* We have a member list to process. */
|
|
/* Overwrite the last ':' with a ',' before counting.
|
|
* This allows us to test for initial ',' and adds
|
|
* one ',' so that the ',' count equals the member
|
|
* count. */
|
|
*p = ',';
|
|
do {
|
|
/* NOTE: glibc difference - glibc allows and trims leading
|
|
* (but not trailing) space. We treat this as an error. */
|
|
/* NOTE: glibc difference - glibc allows consecutive and
|
|
* trailing commas, and ignores "empty string" users. We
|
|
* treat this as an error. */
|
|
if (*p == ',') {
|
|
++i;
|
|
*p = 0; /* nul-terminate each member string. */
|
|
if (!*++p || (*p == ',') || isspace(*p)) {
|
|
goto ERR;
|
|
}
|
|
}
|
|
} while (*++p);
|
|
}
|
|
|
|
/* Now align (p+1), rounding up. */
|
|
/* Assumes sizeof(char **) is a power of 2. */
|
|
members = (char **)( (((intptr_t) p) + sizeof(char **))
|
|
& ~((intptr_t)(sizeof(char **) - 1)) );
|
|
|
|
if (((char *)(members + i)) > end_of_buf) { /* No space. */
|
|
break;
|
|
}
|
|
|
|
((struct group *) data)->gr_mem = members;
|
|
|
|
if (--i) {
|
|
p = endptr; /* Pointing to char prior to first member. */
|
|
do {
|
|
*members++ = ++p;
|
|
if (!--i) break;
|
|
while (*++p) {}
|
|
} while (1);
|
|
}
|
|
*members = NULL;
|
|
|
|
return 0;
|
|
}
|
|
} while (1);
|
|
|
|
ERR:
|
|
return -1;
|
|
}
|
|
|
|
/**********************************************************************/
|
|
|
|
#if ENABLE_USE_BB_SHADOW
|
|
static const unsigned char sp_off[] ALIGN1 = {
|
|
offsetof(struct spwd, sp_namp), /* 0 */
|
|
offsetof(struct spwd, sp_pwdp), /* 1 */
|
|
offsetof(struct spwd, sp_lstchg), /* 2 - not a char ptr */
|
|
offsetof(struct spwd, sp_min), /* 3 - not a char ptr */
|
|
offsetof(struct spwd, sp_max), /* 4 - not a char ptr */
|
|
offsetof(struct spwd, sp_warn), /* 5 - not a char ptr */
|
|
offsetof(struct spwd, sp_inact), /* 6 - not a char ptr */
|
|
offsetof(struct spwd, sp_expire), /* 7 - not a char ptr */
|
|
offsetof(struct spwd, sp_flag) /* 8 - not a char ptr */
|
|
};
|
|
|
|
static int bb__parsespent(void *data, char * line)
|
|
{
|
|
char *endptr;
|
|
char *p;
|
|
int i;
|
|
|
|
i = 0;
|
|
do {
|
|
p = ((char *) ((struct spwd *) data)) + sp_off[i];
|
|
if (i < 2) {
|
|
*((char **) p) = line;
|
|
line = strchr(line, ':');
|
|
if (!line) {
|
|
break;
|
|
}
|
|
} else {
|
|
*((long *) p) = (long) strtoul(line, &endptr, 10);
|
|
|
|
if (endptr == line) {
|
|
*((long *) p) = ((i != 8) ? -1L : ((long)(~0UL)));
|
|
}
|
|
|
|
line = endptr;
|
|
|
|
if (i == 8) {
|
|
if (!*endptr) {
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (*endptr != ':') {
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
*line++ = 0;
|
|
++i;
|
|
} while (1);
|
|
|
|
return EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/**********************************************************************/
|
|
|
|
/* Reads until if EOF, or until if finds a line which fits in the buffer
|
|
* and for which the parser function succeeds.
|
|
*
|
|
* Returns 0 on success and ENOENT for end-of-file (glibc concession).
|
|
*/
|
|
|
|
static int bb__pgsreader(int (*parserfunc)(void *d, char *line), void *data,
|
|
char *__restrict line_buff, size_t buflen, FILE *f)
|
|
{
|
|
int line_len;
|
|
int skip;
|
|
int rv = ERANGE;
|
|
|
|
if (buflen < PWD_BUFFER_SIZE) {
|
|
errno = rv;
|
|
} else {
|
|
skip = 0;
|
|
do {
|
|
if (!fgets(line_buff, buflen, f)) {
|
|
if (feof(f)) {
|
|
rv = ENOENT;
|
|
}
|
|
break;
|
|
}
|
|
|
|
line_len = strlen(line_buff) - 1; /* strlen() must be > 0. */
|
|
if (line_buff[line_len] == '\n') {
|
|
line_buff[line_len] = 0;
|
|
} else if (line_len + 2 == buflen) { /* line too long */
|
|
++skip;
|
|
continue;
|
|
}
|
|
|
|
if (skip) {
|
|
--skip;
|
|
continue;
|
|
}
|
|
|
|
/* NOTE: glibc difference - glibc strips leading whitespace from
|
|
* records. We do not allow leading whitespace. */
|
|
|
|
/* Skip empty lines, comment lines, and lines with leading
|
|
* whitespace. */
|
|
if (*line_buff && (*line_buff != '#') && !isspace(*line_buff)) {
|
|
if (parserfunc == bb__parsegrent) { /* Do evil group hack. */
|
|
/* The group entry parsing function needs to know where
|
|
* the end of the buffer is so that it can construct the
|
|
* group member ptr table. */
|
|
((struct group *) data)->gr_name = line_buff + buflen;
|
|
}
|
|
|
|
if (!parserfunc(data, line_buff)) {
|
|
rv = 0;
|
|
break;
|
|
}
|
|
}
|
|
} while (1);
|
|
|
|
}
|
|
|
|
return rv;
|
|
}
|