/* similar to readlink (cf. man readlink), except that symbolic links are
followed up to MAX_LINK_LEVEL
*/
static int full_readlink(const char* name, char* buf, size_t bufsize)
{
int ret;
if ((ret=my_readlink(name, buf, bufsize)) > 0)
{
char buf2[MAXPATHLEN];
int ret2, i = 0;
do
{
buf[ret] = '\0';
if ((ret2 = my_readlink(buf, buf2, MAXPATHLEN)) > 0)
{
i++;
buf2[ret2] = '\0';
strcpy(buf, buf2);
ret = ret2;
}
else
{
return ret;
}
}
while (i<MAX_LINK_LEVEL);
}
return -1;
}
int my_rename_with_symlink(const char *from, const char *to, myf MyFlags)
{
#ifndef HAVE_READLINK
return my_rename(from, to, MyFlags);
#else
char link_name[FN_REFLEN], tmp_name[FN_REFLEN];
int was_symlink= (!my_disable_symlinks &&
!my_readlink(link_name, from, MYF(0)));
int result=0;
int name_is_different;
DBUG_ENTER("my_rename_with_symlink");
if (!was_symlink)
DBUG_RETURN(my_rename(from, to, MyFlags));
/* Change filename that symlink pointed to */
strmov(tmp_name, to);
fn_same(tmp_name,link_name,1); /* Copy dir */
name_is_different= strcmp(link_name, tmp_name);
if (name_is_different && !access(tmp_name, F_OK))
{
my_errno= EEXIST;
if (MyFlags & MY_WME)
my_error(EE_CANTCREATEFILE, MYF(0), tmp_name, EEXIST);
DBUG_RETURN(1);
}
/* Create new symlink */
if (my_symlink(tmp_name, to, MyFlags))
DBUG_RETURN(1);
/*
Rename symlinked file if the base name didn't change.
This can happen if you use this function where 'from' and 'to' has
the same basename and different directories.
*/
if (name_is_different && my_rename(link_name, tmp_name, MyFlags))
{
int save_errno=my_errno;
my_delete(to, MyFlags); /* Remove created symlink */
my_errno=save_errno;
DBUG_RETURN(1);
}
/* Remove original symlink */
if (my_delete(from, MyFlags))
{
int save_errno=my_errno;
/* Remove created link */
my_delete(to, MyFlags);
/* Rename file back */
if (strcmp(link_name, tmp_name))
(void) my_rename(tmp_name, link_name, MyFlags);
my_errno=save_errno;
result= 1;
}
DBUG_RETURN(result);
#endif /* HAVE_READLINK */
}
struct list *
scsi_get_list(void)
{
DIR *dir;
struct dirent *dirent;
struct list *modules = NULL;
dir = opendir("/sys/bus/scsi/devices");
if (!dir) return NULL;
while((dirent = readdir(dir))) {
char *path;
char *tmp;
char *name = dirent->d_name;
if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
continue;
if (name[0] < '0' || name[0] > '9')
continue;
path = concat("/sys/bus/scsi/devices/", name);
path = my_readlink(path);
tmp = sys_value(path, "type");
if (tmp) {
if (strcmp(tmp, "0") == 0 || strcmp(tmp, "7") == 0)
modules = list_add(modules, "sd_mod");
if (strcmp(tmp, "1") == 0)
modules = list_add(modules, "st");
if (strcmp(tmp, "4") == 0 || strcmp(tmp, "5") == 0)
modules = list_add(modules, "sr_mod");
}
}
closedir(dir);
return modules;
}
int my_delete_with_symlink(const char *name, myf MyFlags)
{
char link_name[FN_REFLEN];
int was_symlink= (!my_disable_symlinks &&
!my_readlink(link_name, name, MYF(0)));
int result;
DBUG_ENTER("my_delete_with_symlink");
if (!(result=my_delete(name, MyFlags)))
{
if (was_symlink)
result=my_delete(link_name, MyFlags);
}
DBUG_RETURN(result);
}
void inotify_dnsmasq_init()
{
struct resolvc *res;
inotify_buffer = safe_malloc(INOTIFY_SZ);
daemon->inotifyfd = inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
if (daemon->inotifyfd == -1)
die(_("failed to create inotify: %s"), NULL, EC_MISC);
if (option_bool(OPT_NO_RESOLV))
return;
for (res = daemon->resolv_files; res; res = res->next)
{
char *d, *new_path, *path = safe_malloc(strlen(res->name) + 1);
int links = MAXSYMLINKS;
strcpy(path, res->name);
/* Follow symlinks until we reach a non-symlink, or a non-existant file. */
while ((new_path = my_readlink(path)))
{
if (links-- == 0)
die(_("too many symlinks following %s"), res->name, EC_MISC);
free(path);
path = new_path;
}
res->wd = -1;
if ((d = strrchr(path, '/')))
{
*d = 0; /* make path just directory */
res->wd = inotify_add_watch(daemon->inotifyfd, path, IN_CLOSE_WRITE | IN_MOVED_TO);
res->file = d+1; /* pointer to filename */
*d = '/';
if (res->wd == -1 && errno == ENOENT)
die(_("directory %s for resolv-file is missing, cannot poll"), res->name, EC_MISC);
}
if (res->wd == -1)
die(_("failed to create inotify for %s: %s"), res->name, EC_MISC);
}
}
char * fn_format(char * to, const char *name, const char *dir,
const char *extension, uint flag)
{
char dev[FN_REFLEN], buff[FN_REFLEN], *pos, *startpos;
const char *ext;
reg1 size_t length;
size_t dev_length;
my_bool not_used;
DBUG_ENTER("fn_format");
DBUG_ASSERT(name != NULL);
DBUG_ASSERT(extension != NULL);
DBUG_PRINT("enter",("name: %s dir: %s extension: %s flag: %d",
name,dir,extension,flag));
/* Copy and skip directory */
name+=(length=dirname_part(dev, (startpos=(char *) name), &dev_length));
if (length == 0 || (flag & MY_REPLACE_DIR))
{
DBUG_ASSERT(dir != NULL);
/* Use given directory */
convert_dirname(dev,dir,NullS); /* Fix to this OS */
}
else if ((flag & MY_RELATIVE_PATH) && !test_if_hard_path(dev))
{
DBUG_ASSERT(dir != NULL);
/* Put 'dir' before the given path */
strmake(buff,dev,sizeof(buff)-1);
pos=convert_dirname(dev,dir,NullS);
strmake(pos,buff,sizeof(buff)-1- (int) (pos-dev));
}
if (flag & MY_PACK_FILENAME)
pack_dirname(dev,dev); /* Put in ./.. and ~/.. */
if (flag & MY_UNPACK_FILENAME)
(void) unpack_dirname(dev, dev, ¬_used); /* Replace ~/.. with dir */
if (!(flag & MY_APPEND_EXT) &&
(pos= (char*) strchr(name,FN_EXTCHAR)) != NullS)
{
if ((flag & MY_REPLACE_EXT) == 0) /* If we should keep old ext */
{
length=strlength(name); /* Use old extension */
ext = "";
}
else
{
length= (size_t) (pos-(char*) name); /* Change extension */
ext= extension;
}
}
else
{
length=strlength(name); /* No ext, use the now one */
ext=extension;
}
if (strlen(dev)+length+strlen(ext) >= FN_REFLEN || length >= FN_LEN )
{
/* To long path, return original or NULL */
size_t tmp_length;
if (flag & MY_SAFE_PATH)
DBUG_RETURN(NullS);
tmp_length= strlength(startpos);
DBUG_PRINT("error",("dev: '%s' ext: '%s' length: %u",dev,ext,
(uint) length));
(void) strmake(to, startpos, MY_MIN(tmp_length, FN_REFLEN-1));
}
else
{
if (to == startpos)
{
bmove(buff,(uchar*) name,length); /* Save name for last copy */
name=buff;
}
pos=strmake(strmov(to,dev),name,length);
(void) strmov(pos,ext); /* Don't convert extension */
}
/*
If MY_RETURN_REAL_PATH and MY_RESOLVE_SYMLINK is given, only do
realpath if the file is a symbolic link
*/
if (flag & MY_RETURN_REAL_PATH)
(void) my_realpath(to, to, MYF(flag & MY_RESOLVE_SYMLINKS ?
MY_RESOLVE_LINK: 0));
else if (flag & MY_RESOLVE_SYMLINKS)
{
strmov(buff,to);
(void) my_readlink(to, buff, MYF(0));
}
DBUG_RETURN(to);
} /* fn_format */
