#define NFS_PORT 2049
#endif
+#define PMAP_TIMEOUT (10)
+#define CONNECT_TIMEOUT (20)
+#define MOUNT_TIMEOUT (30)
+
#if SIZEOF_SOCKLEN_T - 0 == 0
#define socklen_t unsigned int
#endif
0,
};
+/**
+ * nfs_gethostbyname - resolve a hostname to an IPv4 address
+ * @hostname: pointer to a C string containing a DNS hostname
+ * @saddr: returns an IPv4 address
+ *
+ * Returns 1 if successful, otherwise zero.
+ */
int nfs_gethostbyname(const char *hostname, struct sockaddr_in *saddr)
{
struct hostent *hp;
}
/*
- * Create a socket that is locally bound to a reserved or non-reserved
- * port. For any failures, RPC_ANYSOCK is returned which will cause
- * the RPC code to create the socket instead.
+ * Attempt to connect a socket, but time out after "timeout" seconds.
+ *
+ * On error return, caller closes the socket.
+ */
+static int connect_to(int fd, struct sockaddr *addr,
+ socklen_t addrlen, int timeout)
+{
+ int ret, saved;
+ fd_set rset, wset;
+ struct timeval tv = {
+ .tv_sec = timeout,
+ };
+
+ saved = fcntl(fd, F_GETFL, 0);
+ fcntl(fd, F_SETFL, saved | O_NONBLOCK);
+
+ ret = connect(fd, addr, addrlen);
+ if (ret < 0 && errno != EINPROGRESS)
+ return -1;
+ if (ret == 0)
+ goto out;
+
+ FD_ZERO(&rset);
+ FD_SET(fd, &rset);
+ wset = rset;
+ ret = select(fd + 1, &rset, &wset, NULL, &tv);
+ if (ret == 0) {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+ if (FD_ISSET(fd, &rset) || FD_ISSET(fd, &wset)) {
+ int error;
+ socklen_t len = sizeof(error);
+ if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0)
+ return -1;
+ if (error) {
+ errno = error;
+ return -1;
+ }
+ } else
+ return -1;
+
+out:
+ fcntl(fd, F_SETFL, saved);
+ return 0;
+}
+
+/*
+ * Create a socket that is locally bound to a reserved or non-reserved port.
+ *
+ * The caller should check rpc_createerr to determine the cause of any error.
*/
static int get_socket(struct sockaddr_in *saddr, unsigned int p_prot,
- int resvp, int conn)
+ unsigned int timeout, int resvp, int conn)
{
int so, cc, type;
struct sockaddr_in laddr;
goto err_bind;
}
if (type == SOCK_STREAM || (conn && type == SOCK_DGRAM)) {
- cc = connect(so, (struct sockaddr *)saddr, namelen);
+ cc = connect_to(so, (struct sockaddr *)saddr, namelen,
+ timeout);
if (cc < 0)
goto err_connect;
}
unsigned long version,
unsigned int proto)
{
+ struct sockaddr_in bind_saddr;
unsigned short port = 0;
int socket;
CLIENT *clnt = NULL;
enum clnt_stat stat;
+
+ bind_saddr = *saddr;
+ bind_saddr.sin_port = htons(PMAPPORT);
- saddr->sin_port = htons(PMAPPORT);
-
- /*
- * Try to get a socket with a non-privileged port.
- * clnt*create() will create one anyway if this
- * fails.
- */
- socket = get_socket(saddr, proto, FALSE, FALSE);
+ socket = get_socket(&bind_saddr, proto, PMAP_TIMEOUT, FALSE, FALSE);
if (socket == RPC_ANYSOCK) {
- if (proto == IPPROTO_TCP && errno == ETIMEDOUT) {
- /*
- * TCP SYN timed out, so exit now.
- */
+ if (proto == IPPROTO_TCP &&
+ rpc_createerr.cf_error.re_errno == ETIMEDOUT)
rpc_createerr.cf_stat = RPC_TIMEDOUT;
- }
return 0;
}
switch (proto) {
case IPPROTO_UDP:
- clnt = clntudp_bufcreate(saddr,
+ clnt = clntudp_bufcreate(&bind_saddr,
PMAPPROG, PMAPVERS,
RETRY_TIMEOUT, &socket,
RPCSMALLMSGSIZE,
RPCSMALLMSGSIZE);
break;
case IPPROTO_TCP:
- clnt = clnttcp_create(saddr, PMAPPROG, PMAPVERS, &socket,
+ clnt = clnttcp_create(&bind_saddr,
+ PMAPPROG, PMAPVERS,
+ &socket,
RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
break;
}
else if (port == 0)
rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
}
- if (socket != 1)
- close(socket);
+ close(socket);
return port;
}
p_vers = vers ? &vers : versions;
rpc_createerr.cf_stat = 0;
for (;;) {
- saddr->sin_port = htons(PMAPPORT);
p_port = getport(saddr, prog, *p_vers, *p_prot);
if (p_port) {
if (!port || port == p_port) {
inet_ntoa(saddr->sin_addr),
prog, *p_vers,
*p_prot == IPPROTO_UDP ?
- "udp" : "tcp",
+ _("UDP") : _("TCP"),
p_port);
}
if (clnt_ping(saddr, prog, *p_vers, *p_prot, NULL))
goto out_bad;
}
}
- if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED)
+ if (rpc_createerr.cf_stat != RPC_PROGNOTREGISTERED &&
+ rpc_createerr.cf_stat != RPC_PROGVERSMISMATCH)
goto out_bad;
if (!prot) {
return probe_port(mnt_server, probe_mnt1_first, probe_udp_only);
}
+/**
+ * probe_bothports - discover the RPC endpoints of mountd and NFS server
+ * @mnt_server: pointer to address and pmap argument for mountd results
+ * @nfs_server: pointer to address and pmap argument for NFS server
+ *
+ * Returns 1 if successful, otherwise zero if some error occurred.
+ * Note that the arguments are both input and output arguments.
+ *
+ * A side effect of calling this function is that rpccreateerr is set.
+ */
int probe_bothports(clnt_addr_t *mnt_server, clnt_addr_t *nfs_server)
{
struct pmap *nfs_pmap = &nfs_server->pmap;
return 1;
}
-/*
- * Attempt to start rpc.statd
+/**
+ * start_statd - attempt to start rpc.statd
+ *
+ * Returns 1 if statd is running; otherwise zero.
*/
int start_statd(void)
{
return 0;
}
-/*
+/**
* nfs_call_umount - ask the server to remove a share from it's rmtab
* @mnt_server: address of RPC MNT program server
* @argp: directory path of share to "unmount"
enum clnt_stat res = 0;
int msock;
- switch (mnt_server->pmap.pm_vers) {
- case 3:
- case 2:
- case 1:
- if (!probe_mntport(mnt_server))
- return 0;
- clnt = mnt_openclnt(mnt_server, &msock);
- if (!clnt)
- return 0;
- res = clnt_call(clnt, MOUNTPROC_UMNT,
- (xdrproc_t)xdr_dirpath, (caddr_t)argp,
- (xdrproc_t)xdr_void, NULL,
- TIMEOUT);
- mnt_closeclnt(clnt, msock);
- if (res == RPC_SUCCESS)
- return 1;
- break;
- default:
- res = RPC_SUCCESS;
- break;
- }
+ if (!probe_mntport(mnt_server))
+ return 0;
+ clnt = mnt_openclnt(mnt_server, &msock);
+ if (!clnt)
+ return 0;
+ res = clnt_call(clnt, MOUNTPROC_UMNT,
+ (xdrproc_t)xdr_dirpath, (caddr_t)argp,
+ (xdrproc_t)xdr_void, NULL,
+ TIMEOUT);
+ mnt_closeclnt(clnt, msock);
if (res == RPC_SUCCESS)
return 1;
return 0;
}
+/**
+ * mnt_openclnt - get a handle for a remote mountd service
+ * @mnt_server: address and pmap arguments of mountd service
+ * @msock: returns a file descriptor of the underlying transport socket
+ *
+ * Returns an active handle for the remote's mountd service
+ */
CLIENT *mnt_openclnt(clnt_addr_t *mnt_server, int *msock)
{
struct sockaddr_in *mnt_saddr = &mnt_server->saddr;
CLIENT *clnt = NULL;
mnt_saddr->sin_port = htons((u_short)mnt_pmap->pm_port);
- *msock = get_socket(mnt_saddr, mnt_pmap->pm_prot, TRUE, FALSE);
+ *msock = get_socket(mnt_saddr, mnt_pmap->pm_prot, MOUNT_TIMEOUT,
+ TRUE, FALSE);
if (*msock == RPC_ANYSOCK) {
if (rpc_createerr.cf_error.re_errno == EADDRINUSE)
/*
return NULL;
}
+/**
+ * mnt_closeclnt - terminate a handle for a remote mountd service
+ * @clnt: pointer to an active handle for a remote mountd service
+ * @msock: file descriptor of the underlying transport socket
+ *
+ */
void mnt_closeclnt(CLIENT *clnt, int msock)
{
auth_destroy(clnt->cl_auth);
close(msock);
}
-/*
+/**
+ * clnt_ping - send an RPC ping to the remote RPC service endpoint
+ * @saddr: server's address
+ * @prog: target RPC program number
+ * @vers: target RPC version number
+ * @prot: target RPC protocol
+ * @caddr: filled in with our network address
+ *
* Sigh... getport() doesn't actually check the version number.
* In order to make sure that the server actually supports the service
* we're requesting, we open and RPC client, and fire off a NULL
* RPC call.
+ *
+ * caddr is the network address that the server will use to call us back.
+ * On multi-homed clients, this address depends on which NIC we use to
+ * route requests to the server.
+ *
+ * Returns one if successful, otherwise zero.
*/
int clnt_ping(struct sockaddr_in *saddr, const unsigned long prog,
const unsigned long vers, const unsigned int prot,
static char clnt_res;
struct sockaddr dissolve;
- rpc_createerr.cf_stat = stat = errno = 0;
- sock = get_socket(saddr, prot, FALSE, TRUE);
+ rpc_createerr.cf_stat = stat = 0;
+ sock = get_socket(saddr, prot, CONNECT_TIMEOUT, FALSE, TRUE);
if (sock == RPC_ANYSOCK) {
- if (errno == ETIMEDOUT) {
+ if (rpc_createerr.cf_error.re_errno == ETIMEDOUT) {
/*
* TCP timeout. Bubble up the error to see
* how it should be handled.
else
return 0;
}
+
+/**
+ * get_client_address - acquire our local network address
+ * @saddr: server's address
+ * @caddr: filled in with our network address
+ *
+ * Discover a network address that the server will use to call us back.
+ * On multi-homed clients, this address depends on which NIC we use to
+ * route requests to the server.
+ *
+ * Use a connected datagram socket so as not to leave a socket in TIME_WAIT.
+ *
+ * Returns one if successful, otherwise zero.
+ */
+int get_client_address(struct sockaddr_in *saddr, struct sockaddr_in *caddr)
+{
+ socklen_t len = sizeof(*caddr);
+ int socket, err;
+
+ socket = get_socket(saddr, IPPROTO_UDP, CONNECT_TIMEOUT, FALSE, TRUE);
+ if (socket == RPC_ANYSOCK)
+ return 0;
+
+ err = getsockname(socket, caddr, &len);
+ close(socket);
+
+ if (err && verbose) {
+ nfs_error(_("%s: getsockname failed: %s"),
+ progname, strerror(errno));
+ return 0;
+ }
+ return 1;
+}
projects / nfs-utils.git / blobdiff