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/*
* Copyright (C) 2008-2009 Karel Zak <kzak@redhat.com>
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#else
#define PR_GET_DUMPABLE 3
#endif
#if (!defined(HAVE_PRCTL) && defined(linux))
#include <sys/syscall.h>
#endif
#include <sys/stat.h>
#include <ctype.h>
#include <sys/types.h>
#include <fcntl.h>
#include <pwd.h>
#include "mountP.h"
char *mnt_getenv_safe(const char *arg)
{
if ((getuid() != geteuid()) || (getgid() != getegid()))
return NULL;
#if HAVE_PRCTL
if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
return NULL;
#else
#if (defined(linux) && defined(SYS_prctl))
if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
return NULL;
#endif
#endif
#ifdef HAVE___SECURE_GETENV
return __secure_getenv(arg);
#else
return getenv(arg);
#endif
}
/* TODO: move strn<...> functions to top-level lib/strn.c */
#ifndef HAVE_STRNLEN
size_t strnlen(const char *s, size_t maxlen)
{
int i;
for (i = 0; i < maxlen; i++) {
if (s[i] == '\0')
return i + 1;
}
return maxlen;
}
#endif
#ifndef HAVE_STRNCHR
char *strnchr(const char *s, size_t maxlen, int c)
{
for (; maxlen-- && *s != '\0'; ++s)
if (*s == (char)c)
return (char *)s;
return NULL;
}
#endif
#ifndef HAVE_STRNDUP
char *strndup(const char *s, size_t n)
{
size_t len = strnlen (s, n);
char *new = (char *) malloc (len + 1);
if (new == NULL)
return NULL;
new[len] = '\0';
return (char *) memcpy (new, s, len);
}
#endif
/**
* mnt_fstype_is_pseudofs:
* @type: filesystem name
*
* Returns: 1 for filesystems like proc, sysfs, ... or 0.
*/
int mnt_fstype_is_pseudofs(const char *type)
{
if (!type)
return 0;
if (strcmp(type, "none") == 0 ||
strcmp(type, "proc") == 0 ||
strcmp(type, "tmpfs") == 0 ||
strcmp(type, "sysfs") == 0 ||
strcmp(type, "devpts") == 0||
strcmp(type, "cgroups") == 0 ||
strcmp(type, "devfs") == 0 ||
strcmp(type, "dlmfs") == 0 ||
strcmp(type, "cpuset") == 0 ||
strcmp(type, "spufs") == 0)
return 1;
return 0;
}
/**
* mnt_fstype_is_netfs:
* @type: filesystem name
*
* Returns: 1 for filesystems like cifs, nfs, ... or 0.
*/
int mnt_fstype_is_netfs(const char *type)
{
if (!type)
return 0;
if (strcmp(type, "cifs") == 0 ||
strcmp(type, "smbfs") == 0 ||
strncmp(type, "nfs", 3) == 0 ||
strcmp(type, "afs") == 0 ||
strcmp(type, "ncpfs") == 0)
return 1;
return 0;
}
/*
* Reallocates its first arg @s - typical use: s = mnt_strconcat3(s,t,u);
* Returns reallocated @s ion succes or NULL in case of error.
*/
char *mnt_strconcat3(char *s, const char *t, const char *u)
{
size_t len = 0;
len = (s ? strlen(s) : 0) + (t ? strlen(t) : 0) + (u ? strlen(u) : 0);
if (!len)
return NULL;
if (!s) {
s = malloc(len + 1);
*s = '\0';
} else
s = realloc(s, len + 1);
if (!s)
return NULL;
if (t)
strcat(s, t);
if (u)
strcat(s, u);
return s;
}
/**
* mnt_open_device:
* @devname: device path
* @flags: open(2) flags
*
* Opens device like open(2), but waits for cdrom medium (if errno=ENOMEDIUM).
*
* Returns: file descriptor or -1 in case of error.
*/
int mnt_open_device(const char *devname, int flags)
{
int retries = 0;
do {
int fd = open(devname, flags);
if (fd >= 0)
return fd;
if (errno != ENOMEDIUM)
break;
if (retries >= CONFIG_CDROM_NOMEDIUM_RETRIES)
break;
++retries;
sleep(3);
} while(1);
return -1;
}
/*
* Returns allocated string with username or NULL.
*/
char *mnt_get_username(const uid_t uid)
{
struct passwd pwd;
struct passwd *res;
size_t sz = sysconf(_SC_GETPW_R_SIZE_MAX);
char *buf, *username = NULL;
if (sz <= 0)
sz = 16384; /* Should be more than enough */
buf = malloc(sz);
if (!buf)
return NULL;
if (!getpwuid_r(uid, &pwd, buf, sz, &res) && res)
username = strdup(pwd.pw_name);
free(buf);
return username;
}
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