300 lines
7.0 KiB
C
300 lines
7.0 KiB
C
/*
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* linux/net/sunrpc/pmap.c
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*
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* Portmapper client.
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*
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* Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/uio.h>
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#include <linux/in.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/xprt.h>
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#include <linux/sunrpc/sched.h>
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#ifdef RPC_DEBUG
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# define RPCDBG_FACILITY RPCDBG_PMAP
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#endif
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#define PMAP_SET 1
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#define PMAP_UNSET 2
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#define PMAP_GETPORT 3
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static struct rpc_procinfo pmap_procedures[];
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static struct rpc_clnt * pmap_create(char *, struct sockaddr_in *, int);
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static void pmap_getport_done(struct rpc_task *);
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static struct rpc_program pmap_program;
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static DEFINE_SPINLOCK(pmap_lock);
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/*
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* Obtain the port for a given RPC service on a given host. This one can
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* be called for an ongoing RPC request.
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*/
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void
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rpc_getport(struct rpc_task *task, struct rpc_clnt *clnt)
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{
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struct rpc_portmap *map = clnt->cl_pmap;
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struct sockaddr_in *sap = &clnt->cl_xprt->addr;
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struct rpc_message msg = {
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.rpc_proc = &pmap_procedures[PMAP_GETPORT],
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.rpc_argp = map,
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.rpc_resp = &clnt->cl_port,
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.rpc_cred = NULL
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};
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struct rpc_clnt *pmap_clnt;
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struct rpc_task *child;
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dprintk("RPC: %4d rpc_getport(%s, %d, %d, %d)\n",
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task->tk_pid, clnt->cl_server,
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map->pm_prog, map->pm_vers, map->pm_prot);
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/* Autobind on cloned rpc clients is discouraged */
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BUG_ON(clnt->cl_parent != clnt);
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spin_lock(&pmap_lock);
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if (map->pm_binding) {
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rpc_sleep_on(&map->pm_bindwait, task, NULL, NULL);
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spin_unlock(&pmap_lock);
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return;
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}
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map->pm_binding = 1;
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spin_unlock(&pmap_lock);
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pmap_clnt = pmap_create(clnt->cl_server, sap, map->pm_prot);
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if (IS_ERR(pmap_clnt)) {
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task->tk_status = PTR_ERR(pmap_clnt);
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goto bailout;
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}
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task->tk_status = 0;
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/*
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* Note: rpc_new_child will release client after a failure.
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*/
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if (!(child = rpc_new_child(pmap_clnt, task)))
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goto bailout;
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/* Setup the call info struct */
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rpc_call_setup(child, &msg, 0);
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/* ... and run the child task */
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rpc_run_child(task, child, pmap_getport_done);
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return;
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bailout:
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spin_lock(&pmap_lock);
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map->pm_binding = 0;
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rpc_wake_up(&map->pm_bindwait);
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spin_unlock(&pmap_lock);
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task->tk_status = -EIO;
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task->tk_action = NULL;
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}
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#ifdef CONFIG_ROOT_NFS
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int
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rpc_getport_external(struct sockaddr_in *sin, __u32 prog, __u32 vers, int prot)
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{
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struct rpc_portmap map = {
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.pm_prog = prog,
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.pm_vers = vers,
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.pm_prot = prot,
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.pm_port = 0
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};
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struct rpc_clnt *pmap_clnt;
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char hostname[32];
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int status;
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dprintk("RPC: rpc_getport_external(%u.%u.%u.%u, %d, %d, %d)\n",
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NIPQUAD(sin->sin_addr.s_addr), prog, vers, prot);
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sprintf(hostname, "%u.%u.%u.%u", NIPQUAD(sin->sin_addr.s_addr));
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pmap_clnt = pmap_create(hostname, sin, prot);
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if (IS_ERR(pmap_clnt))
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return PTR_ERR(pmap_clnt);
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/* Setup the call info struct */
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status = rpc_call(pmap_clnt, PMAP_GETPORT, &map, &map.pm_port, 0);
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if (status >= 0) {
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if (map.pm_port != 0)
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return map.pm_port;
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status = -EACCES;
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}
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return status;
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}
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#endif
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static void
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pmap_getport_done(struct rpc_task *task)
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{
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struct rpc_clnt *clnt = task->tk_client;
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struct rpc_portmap *map = clnt->cl_pmap;
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dprintk("RPC: %4d pmap_getport_done(status %d, port %d)\n",
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task->tk_pid, task->tk_status, clnt->cl_port);
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if (task->tk_status < 0) {
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/* Make the calling task exit with an error */
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task->tk_action = NULL;
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} else if (clnt->cl_port == 0) {
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/* Program not registered */
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task->tk_status = -EACCES;
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task->tk_action = NULL;
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} else {
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/* byte-swap port number first */
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clnt->cl_port = htons(clnt->cl_port);
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clnt->cl_xprt->addr.sin_port = clnt->cl_port;
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}
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spin_lock(&pmap_lock);
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map->pm_binding = 0;
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rpc_wake_up(&map->pm_bindwait);
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spin_unlock(&pmap_lock);
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}
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/*
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* Set or unset a port registration with the local portmapper.
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* port == 0 means unregister, port != 0 means register.
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*/
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int
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rpc_register(u32 prog, u32 vers, int prot, unsigned short port, int *okay)
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{
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struct sockaddr_in sin;
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struct rpc_portmap map;
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struct rpc_clnt *pmap_clnt;
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int error = 0;
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dprintk("RPC: registering (%d, %d, %d, %d) with portmapper.\n",
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prog, vers, prot, port);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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pmap_clnt = pmap_create("localhost", &sin, IPPROTO_UDP);
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if (IS_ERR(pmap_clnt)) {
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error = PTR_ERR(pmap_clnt);
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dprintk("RPC: couldn't create pmap client. Error = %d\n", error);
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return error;
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}
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map.pm_prog = prog;
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map.pm_vers = vers;
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map.pm_prot = prot;
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map.pm_port = port;
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error = rpc_call(pmap_clnt, port? PMAP_SET : PMAP_UNSET,
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&map, okay, 0);
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if (error < 0) {
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printk(KERN_WARNING
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"RPC: failed to contact portmap (errno %d).\n",
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error);
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}
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dprintk("RPC: registration status %d/%d\n", error, *okay);
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/* Client deleted automatically because cl_oneshot == 1 */
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return error;
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}
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static struct rpc_clnt *
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pmap_create(char *hostname, struct sockaddr_in *srvaddr, int proto)
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{
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struct rpc_xprt *xprt;
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struct rpc_clnt *clnt;
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/* printk("pmap: create xprt\n"); */
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xprt = xprt_create_proto(proto, srvaddr, NULL);
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if (IS_ERR(xprt))
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return (struct rpc_clnt *)xprt;
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xprt->addr.sin_port = htons(RPC_PMAP_PORT);
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/* printk("pmap: create clnt\n"); */
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clnt = rpc_new_client(xprt, hostname,
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&pmap_program, RPC_PMAP_VERSION,
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RPC_AUTH_UNIX);
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if (!IS_ERR(clnt)) {
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clnt->cl_softrtry = 1;
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clnt->cl_chatty = 1;
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clnt->cl_oneshot = 1;
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}
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return clnt;
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}
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/*
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* XDR encode/decode functions for PMAP
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*/
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static int
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xdr_encode_mapping(struct rpc_rqst *req, u32 *p, struct rpc_portmap *map)
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{
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dprintk("RPC: xdr_encode_mapping(%d, %d, %d, %d)\n",
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map->pm_prog, map->pm_vers, map->pm_prot, map->pm_port);
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*p++ = htonl(map->pm_prog);
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*p++ = htonl(map->pm_vers);
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*p++ = htonl(map->pm_prot);
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*p++ = htonl(map->pm_port);
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req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
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return 0;
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}
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static int
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xdr_decode_port(struct rpc_rqst *req, u32 *p, unsigned short *portp)
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{
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*portp = (unsigned short) ntohl(*p++);
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return 0;
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}
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static int
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xdr_decode_bool(struct rpc_rqst *req, u32 *p, unsigned int *boolp)
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{
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*boolp = (unsigned int) ntohl(*p++);
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return 0;
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}
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static struct rpc_procinfo pmap_procedures[] = {
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[PMAP_SET] = {
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.p_proc = PMAP_SET,
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.p_encode = (kxdrproc_t) xdr_encode_mapping,
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.p_decode = (kxdrproc_t) xdr_decode_bool,
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.p_bufsiz = 4,
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.p_count = 1,
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},
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[PMAP_UNSET] = {
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.p_proc = PMAP_UNSET,
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.p_encode = (kxdrproc_t) xdr_encode_mapping,
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.p_decode = (kxdrproc_t) xdr_decode_bool,
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.p_bufsiz = 4,
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.p_count = 1,
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},
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[PMAP_GETPORT] = {
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.p_proc = PMAP_GETPORT,
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.p_encode = (kxdrproc_t) xdr_encode_mapping,
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.p_decode = (kxdrproc_t) xdr_decode_port,
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.p_bufsiz = 4,
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.p_count = 1,
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},
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};
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static struct rpc_version pmap_version2 = {
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.number = 2,
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.nrprocs = 4,
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.procs = pmap_procedures
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};
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static struct rpc_version * pmap_version[] = {
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NULL,
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NULL,
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&pmap_version2
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};
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static struct rpc_stat pmap_stats;
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static struct rpc_program pmap_program = {
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.name = "portmap",
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.number = RPC_PMAP_PROGRAM,
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.nrvers = ARRAY_SIZE(pmap_version),
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.version = pmap_version,
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.stats = &pmap_stats,
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};
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