8296e62957
We already have sgetspent(), with identical semantics, defined in
<lib/sgetspent.c>.
$ diff -u <(grepc sgetspent .) <(grepc my_sgetspent .)
--- /dev/fd/63 2024-11-11 11:56:55.444055921 +0100
+++ /dev/fd/62 2024-11-11 11:56:55.444055921 +0100
@@ -1,23 +1,19 @@
-./lib/sgetspent.c:struct spwd *
-sgetspent(const char *string)
+./lib/shadow.c:static struct spwd *my_sgetspent (const char *string)
{
- static char spwbuf[PASSWD_ENTRY_MAX_LENGTH];
- static struct spwd spwd;
- char *fields[FIELDS];
- char *cp;
- int i;
+ int i;
+ char *fields[FIELDS];
+ char *cp;
+ static char spwbuf[BUFSIZ];
+ static char empty[] = "";
+ static struct spwd spwd;
/*
* Copy string to local buffer. It has to be tokenized and we
* have to do that to our private copy.
*/
- if (strlen (string) >= sizeof spwbuf) {
- fprintf (shadow_logfd,
- "%s: Too long passwd entry encountered, file corruption?\n",
- shadow_progname);
- return NULL; /* fail if too long */
- }
+ if (strlen (string) >= sizeof spwbuf)
+ return 0;
strcpy (spwbuf, string);
stpsep(spwbuf, "\n");
@@ -30,14 +26,16 @@
fields[i] = strsep(&cp, ":");
if (i == (FIELDS - 1))
- fields[i++] = "";
+ fields[i++] = empty;
if (cp != NULL || (i != FIELDS && i != OFIELDS))
- return NULL;
+ return 0;
/*
* Start populating the structure. The fields are all in
- * static storage, as is the structure we pass back.
+ * static storage, as is the structure we pass back. If we
+ * ever see a name with '+' as the first character, we try
+ * to turn on NIS processing.
*/
spwd.sp_namp = fields[0];
@@ -46,13 +44,13 @@
/*
* Get the last changed date. For all of the integer fields,
* we check for proper format. It is an error to have an
- * incorrectly formatted number.
+ * incorrectly formatted number, unless we are using NIS.
*/
if (fields[2][0] == '\0')
spwd.sp_lstchg = -1;
else if (a2sl(&spwd.sp_lstchg, fields[2], NULL, 0, 0, LONG_MAX) == -1)
- return NULL;
+ return 0;
/*
* Get the minimum period between password changes.
@@ -61,7 +59,7 @@
if (fields[3][0] == '\0')
spwd.sp_min = -1;
else if (a2sl(&spwd.sp_min, fields[3], NULL, 0, 0, LONG_MAX) == -1)
- return NULL;
+ return 0;
/*
* Get the maximum number of days a password is valid.
@@ -70,7 +68,7 @@
if (fields[4][0] == '\0')
spwd.sp_max = -1;
else if (a2sl(&spwd.sp_max, fields[4], NULL, 0, 0, LONG_MAX) == -1)
- return NULL;
+ return 0;
/*
* If there are only OFIELDS fields (this is a SVR3.2 /etc/shadow
@@ -93,7 +91,7 @@
if (fields[5][0] == '\0')
spwd.sp_warn = -1;
else if (a2sl(&spwd.sp_warn, fields[5], NULL, 0, 0, LONG_MAX) == -1)
- return NULL;
+ return 0;
/*
* Get the number of days of inactivity before an account is
@@ -103,7 +101,7 @@
if (fields[6][0] == '\0')
spwd.sp_inact = -1;
else if (a2sl(&spwd.sp_inact, fields[6], NULL, 0, 0, LONG_MAX) == -1)
- return NULL;
+ return 0;
/*
* Get the number of days after the epoch before the account is
@@ -113,7 +111,7 @@
if (fields[7][0] == '\0')
spwd.sp_expire = -1;
else if (a2sl(&spwd.sp_expire, fields[7], NULL, 0, 0, LONG_MAX) == -1)
- return NULL;
+ return 0;
/*
* This field is reserved for future use. But it isn't supposed
@@ -123,8 +121,7 @@
if (fields[8][0] == '\0')
spwd.sp_flag = SHADOW_SP_FLAG_UNSET;
else if (str2ul(&spwd.sp_flag, fields[8]) == -1)
- return NULL;
+ return 0;
return (&spwd);
}
-./lib/prototypes.h:extern struct spwd *sgetspent (const char *string);
Closes: <https://github.com/shadow-maint/shadow/issues/1114>
Link: <https://www.youtube.com/watch?v=IpbvtSQvgWM>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
113 lines
1.8 KiB
C
113 lines
1.8 KiB
C
/*
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* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
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* SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
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* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
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* SPDX-FileCopyrightText: 2009 , Nicolas François
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <config.h>
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/* Newer versions of Linux libc already have shadow support. */
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#ifndef HAVE_GETSPNAM
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#ident "$Id$"
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include "atoi/a2i/a2s.h"
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#include "atoi/str2i/str2u.h"
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#include "defines.h"
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#include "prototypes.h"
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#include "string/strtok/stpsep.h"
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static FILE *shadow;
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#define FIELDS 9
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#define OFIELDS 5
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/*
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* setspent - initialize access to shadow text and DBM files
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*/
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void setspent (void)
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{
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if (NULL != shadow) {
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rewind (shadow);
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}else {
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shadow = fopen (SHADOW_FILE, "r");
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}
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}
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/*
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* endspent - terminate access to shadow text and DBM files
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*/
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void endspent (void)
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{
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if (NULL != shadow) {
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(void) fclose (shadow);
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}
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shadow = NULL;
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}
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/*
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* fgetspent - get an entry from a /etc/shadow formatted stream
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*/
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struct spwd *fgetspent (FILE * fp)
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{
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char buf[BUFSIZ];
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if (NULL == fp) {
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return (0);
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}
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if (fgets (buf, sizeof buf, fp) != NULL)
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{
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stpsep(buf, "\n");
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return sgetspent(buf);
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}
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return 0;
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}
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/*
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* getspent - get a (struct spwd *) from the current shadow file
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*/
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struct spwd *getspent (void)
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{
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if (NULL == shadow) {
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setspent ();
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}
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return (fgetspent (shadow));
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}
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/*
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* getspnam - get a shadow entry by name
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*/
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struct spwd *getspnam (const char *name)
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{
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struct spwd *sp;
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setspent ();
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while ((sp = getspent ()) != NULL) {
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if (strcmp (name, sp->sp_namp) == 0) {
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break;
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}
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}
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endspent ();
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return (sp);
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}
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#else
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extern int ISO_C_forbids_an_empty_translation_unit;
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#endif
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