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2011-08-20 Jonathan Nieder <jrnieder@gmail.com>

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* lib/Makefile.am: Added lib/spawn.c and lib/spawn.h.
	* lib/nscd.c, lib/spawn.c, lib/spawn.h: It is not possible to
	differentiate between an nscd failure, and a failure to execute
	due to no nscd with posix_spawn. Use our own run_command routine.
	* src/userdel.c: Use run_command()
This commit is contained in:
nekral-guest 2011-08-20 13:33:38 +00:00
parent ec309dcac8
commit fc0057ff35
6 changed files with 118 additions and 34 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2011-08-20 Jonathan Nieder <jrnieder@gmail.com>
* lib/Makefile.am: Added lib/spawn.c and lib/spawn.h.
* lib/nscd.c, lib/spawn.c, lib/spawn.h: It is not possible to
differentiate between an nscd failure, and a failure to execute
due to no nscd with posix_spawn. Use our own run_command routine.
* src/userdel.c: Use run_command()
2011-08-15 Nicolas François <nicolas.francois@centraliens.net>
* src/groupmod.c: Ignore return value from snprintf.

2
lib/Makefile.am
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@ -48,6 +48,8 @@ libshadow_la_SOURCES = \
shadowio.c \
shadowio.h \
shadowmem.c \
spawn.c \
spawn.h \
utent.c
if WITH_TCB

41
lib/nscd.c
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@ -16,7 +16,9 @@
#include <errno.h>
#include <sys/wait.h>
#include <sys/types.h>
#include "exitcodes.h"
#include "defines.h"
#include "spawn.h"
#include "nscd.h"
#define MSG_NSCD_FLUSH_CACHE_FAILED "Failed to flush the nscd cache.\n"
@ -26,37 +28,32 @@
*/
int nscd_flush_cache (const char *service)
{
pid_t pid, termpid;
int err, status;
char *spawnedArgs[] = {"/usr/sbin/nscd", "nscd", "-i", service, NULL};
char *spawnedEnv[] = {NULL};
pid_t pid;
int err, status, code;
const char *spawnedArgs[] = {"/usr/sbin/nscd", "nscd", "-i", service, NULL};
const char *spawnedEnv[] = {NULL};
/* spawn process */
err = posix_spawn (&pid, spawnedArgs[0], NULL, NULL,
spawnedArgs, spawnedEnv);
if(0 != err)
err = run_command (spawnedArgs[0], spawnedArgs, spawnedEnv, &status);
if (0 != err)
{
/* run_command writes its own more detailed message. */
(void) fputs (_(MSG_NSCD_FLUSH_CACHE_FAILED), stderr);
(void) fprintf (stderr, "posix_spawn() error=%d\n", err);
return -1;
}
/* Wait for the spawned process to exit */
termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
if (-1 == termpid)
code = WIFEXITED (status) ? WEXITSTATUS (status)
: (WTERMSIG (status) + 128);
if (code == E_CMD_NOTFOUND)
{
/* nscd is not installed, or it is installed but uses an
interpreter that is missing. Probably the former. */
return 0;
}
if (code != 0)
{
(void) fprintf (stderr, "nscd exited with status %d", code);
(void) fputs (_(MSG_NSCD_FLUSH_CACHE_FAILED), stderr);
perror("waitpid");
return -1;
}
else if (termpid != pid)
{
(void) fputs (_(MSG_NSCD_FLUSH_CACHE_FAILED), stderr);
(void) fprintf (stderr, "waitpid returned %ld != %ld\n",
(long int) termpid, (long int) pid);
return -1;
}
return 0;
}
#else /* USE_NSCD */

76
lib/spawn.c Normal file
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@ -0,0 +1,76 @@
/*
* Copyright (c) 2011, Jonathan Nieder
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 FREEBSD
* PROJECT 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.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include "exitcodes.h"
#include "spawn.h"
extern char **environ;
int run_command (const char *cmd, const char *argv[], const char *envp[],
int *status)
{
pid_t pid, wpid;
if (!envp)
envp = (const char **)environ;
pid = fork ();
if (pid == 0) {
execve (cmd, (char * const *) argv, (char * const *) envp);
if (errno == ENOENT)
exit (E_CMD_NOTFOUND);
perror(cmd);
exit (E_CMD_NOEXEC);
} else if ((pid_t)-1 == pid) {
int saved_errno = errno;
perror ("fork");
errno = saved_errno;
return -1;
}
do {
wpid = waitpid (pid, status, 0);
} while ((pid_t)-1 == wpid && errno == EINTR);
if ((pid_t)-1 == wpid) {
int saved_errno = errno;
perror ("waitpid");
return -1;
} else if (wpid != pid) {
(void) fprintf (stderr, "waitpid returned %ld != %ld\n",
(long int) wpid, (long int) pid);
errno = ECHILD;
return -1;
}
return 0;
}

7
lib/spawn.h Normal file
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@ -0,0 +1,7 @@
#ifndef _SPAWN_H
#define _SPAWN_H
extern int run_command (const char *cmd, const char *argv[],
const char *envp[], int *status);
#endif

18
src/userdel.c
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@ -59,6 +59,7 @@
#ifdef SHADOWGRP
#include "sgroupio.h"
#endif /* SHADOWGRP */
#include "spawn.h"
#ifdef WITH_TCB
#include <tcb.h>
#include "tcbfuncs.h"
@ -628,6 +629,7 @@ static void update_user (void)
static void user_cancel (const char *user)
{
const char *cmd;
const char *argv[3];
pid_t pid, wpid;
int status;
@ -635,18 +637,10 @@ static void user_cancel (const char *user)
if (NULL == cmd) {
return;
}
pid = fork ();
if (pid == 0) {
execl (cmd, cmd, user, (char *) 0);
perror (cmd);
exit (errno == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
} else if ((pid_t)-1 == pid) {
perror ("fork");
return;
}
do {
wpid = wait (&status);
} while ((wpid != pid) && ((pid_t)-1 != wpid));
argv[0] = cmd;
argv[1] = user;
argv[2] = (char *)0;
(void) run_command (cmd, argv, NULL, &status);
}
#ifdef EXTRA_CHECK_HOME_DIR