static void next_lookup(struct host_query *hquery)
{
int status;
const char *p;
struct hostent *host;
for (p = hquery->remaining_lookups; *p; p++)
{
switch (*p)
{
case 'b':
/* DNS lookup */
hquery->remaining_lookups = p + 1;
ares_search(hquery->channel, hquery->name, C_IN, T_A, host_callback,
hquery);
return;
case 'f':
/* Host file lookup */
status = file_lookup(hquery->name, &host);
if (status != ARES_ENOTFOUND)
{
end_hquery(hquery, status, host);
return;
}
break;
}
}
end_hquery(hquery, ARES_ENOTFOUND, NULL);
}
static void next_lookup(struct addr_query *aquery)
{
const char *p;
char name[128];
int status;
struct hostent *host;
for (p = aquery->remaining_lookups; *p; p++)
{
switch (*p)
{
case 'b':
ptr_rr_name(name, &aquery->addr);
aquery->remaining_lookups = p + 1;
ares_query(aquery->channel, name, C_IN, T_PTR, addr_callback,
aquery);
return;
case 'f':
status = file_lookup(&aquery->addr, &host);
/* this status check below previously checked for !ARES_ENOTFOUND,
but we should not assume that this single error code is the one
that can occur, as that is in fact no longer the case */
if (status == ARES_SUCCESS)
{
end_aquery(aquery, status, host);
return;
}
break;
}
}
end_aquery(aquery, ARES_ENOTFOUND, NULL);
}
/* This is an API method */
int ares_gethostbyname_file(ares_channel channel, const char *name,
int family, struct hostent **host)
{
int result;
/* We only take the channel to ensure that ares_init() been called. */
if(channel == NULL)
{
/* Anything will do, really. This seems fine, and is consistent with
other error cases. */
*host = NULL;
return ARES_ENOTFOUND;
}
/* Just chain to the internal implementation we use here; it's exactly
* what we want.
*/
result = file_lookup(name, family, host);
if(result != ARES_SUCCESS)
{
/* We guarantee a NULL hostent on failure. */
*host = NULL;
}
return result;
}
static void next_lookup(struct host_query *hquery, int status_code)
{
const char *p;
struct hostent *host;
int status = status_code;
for (p = hquery->remaining_lookups; *p; p++)
{
switch (*p)
{
case 'b':
/* DNS lookup */
hquery->remaining_lookups = p + 1;
if ((hquery->want_family == AF_INET6) ||
(hquery->want_family == AF_UNSPEC)) {
/* if inet6 or unspec, start out with AAAA */
hquery->sent_family = AF_INET6;
ares_search(hquery->channel, hquery->name, C_IN, T_AAAA,
host_callback, hquery);
}
else {
hquery->sent_family = AF_INET;
ares_search(hquery->channel, hquery->name, C_IN, T_A,
host_callback, hquery);
}
return;
case 'f':
/* Host file lookup */
status = file_lookup(hquery->name, hquery->want_family, &host);
/* this status check below previously checked for !ARES_ENOTFOUND,
but we should not assume that this single error code is the one
that can occur, as that is in fact no longer the case */
if (status == ARES_SUCCESS)
{
end_hquery(hquery, status, host);
return;
}
status = status_code; /* Use original status code */
break;
}
}
end_hquery(hquery, status, NULL);
}
int hostfile_lookup(const char *name, struct hostent **host)
{
return file_lookup(name, host);
}
/*Makes sure that all ports to the underlying filesystem of `node` are
up to date*/
error_t node_update (node_t * node)
{
error_t err = 0;
/*The full path to this node */
char *path;
/*Stat information for `node` */
io_statbuf_t stat;
/*The port to the file corresponding to `node` */
file_t port;
/*If the specified node is the root node or if it must not be updated */
if (NODE_IS_ROOT (node) || (node->nn->flags & FLAG_NODE_ULFS_FIXED))
/*do nothing */
return err; /*return 0; actually */
/*Gain exclusive access to the root node of the filesystem */
mutex_lock (&netfs_root_node->lock);
/*Construct the full path to `node` */
err = lnode_path_construct (node->nn->lnode, &path);
if (err)
{
mutex_unlock (&netfs_root_node->lock);
return err;
}
/*Deallocate `node`'s port to the underlying filesystem */
if (node->nn->port)
PORT_DEALLOC (node->nn->port);
/*Try to lookup the file for `node` in its untranslated version */
err = file_lookup
(netfs_root_node->nn->port, path, O_READ | O_NOTRANS, O_NOTRANS,
0, &port, &stat);
if (err)
{
node->nn->port = MACH_PORT_NULL;
err = 0; /*failure (?) */
return err;
}
/*If the node looked up is actually the root node of the proxy filesystem */
if ((stat.st_ino == underlying_node_stat.st_ino)
&& (stat.st_fsid == underlying_node_stat.st_fsid))
/*set `err` accordingly */
err = ELOOP;
else
{
/*deallocate the obtained port */
PORT_DEALLOC (port);
/*obtain the translated version of the required node */
err = file_lookup
(netfs_root_node->nn->port, path, O_READ, 0, 0, &port, &stat);
}
/*If there have been errors */
if (err)
/*reset the port */
port = MACH_PORT_NULL;
/*Store the port in the node */
node->nn->port = port;
/*Remove the flag about the invalidity of the current node and set the
flag that the node is up-to-date */
node->nn->flags &= ~FLAG_NODE_INVALIDATE;
node->nn->flags |= FLAG_NODE_ULFS_UPTODATE;
/*Release the lock on the root node of proxy filesystem */
mutex_unlock (&netfs_root_node->lock);
/*Return the result of operations */
return err;
} /*node_update */
