1 /* Blue Sky: File Systems in the Cloud
3 * Copyright (C) 2009 The Regents of the University of California
4 * Written by Michael Vrable <mvrable@cs.ucsd.edu>
9 /* RPC handling: registration, marshalling and unmarshalling of messages. For
10 * now this uses the standard Sun RPC mechanisms in the standard C library.
11 * Later, it might be changed to use something better. Much of this code was
12 * generated with rpcgen from the XDR specifications, but has been hand-edited
15 #include "mount_prot.h"
16 #include "nfs3_prot.h"
19 #include <rpc/pmap_clnt.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <netinet/ip.h>
30 static int outstanding_rpcs = 0;
31 static struct bluesky_stats *rpc_recv_stats, *rpc_send_stats;
33 /* TCP port number to use for NFS protocol. (Should be 2049.) */
34 #define NFS_SERVICE_PORT 2051
36 /* Maximum size of a single RPC message that we will accept (8 MB). */
37 #define MAX_RPC_MSGSIZE (8 << 20)
40 mount_program_3(struct svc_req *rqstp, register SVCXPRT *transp)
43 dirpath mountproc3_mnt_3_arg;
44 dirpath mountproc3_umnt_3_arg;
47 xdrproc_t _xdr_argument, _xdr_result;
48 char *(*local)(char *, struct svc_req *);
50 switch (rqstp->rq_proc) {
52 _xdr_argument = (xdrproc_t) xdr_void;
53 _xdr_result = (xdrproc_t) xdr_void;
54 local = (char *(*)(char *, struct svc_req *)) mountproc3_null_3_svc;
58 _xdr_argument = (xdrproc_t) xdr_dirpath;
59 _xdr_result = (xdrproc_t) xdr_mountres3;
60 local = (char *(*)(char *, struct svc_req *)) mountproc3_mnt_3_svc;
64 _xdr_argument = (xdrproc_t) xdr_void;
65 _xdr_result = (xdrproc_t) xdr_mountlist;
66 local = (char *(*)(char *, struct svc_req *)) mountproc3_dump_3_svc;
70 _xdr_argument = (xdrproc_t) xdr_dirpath;
71 _xdr_result = (xdrproc_t) xdr_void;
72 local = (char *(*)(char *, struct svc_req *)) mountproc3_umnt_3_svc;
75 case MOUNTPROC3_UMNTALL:
76 _xdr_argument = (xdrproc_t) xdr_void;
77 _xdr_result = (xdrproc_t) xdr_void;
78 local = (char *(*)(char *, struct svc_req *)) mountproc3_umntall_3_svc;
81 case MOUNTPROC3_EXPORT:
82 _xdr_argument = (xdrproc_t) xdr_void;
83 _xdr_result = (xdrproc_t) xdr_exports;
84 local = (char *(*)(char *, struct svc_req *)) mountproc3_export_3_svc;
88 svcerr_noproc (transp);
91 memset ((char *)&argument, 0, sizeof (argument));
92 if (!svc_getargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
93 svcerr_decode (transp);
96 result = (*local)((char *)&argument, rqstp);
97 if (result != NULL && !svc_sendreply(transp, (xdrproc_t) _xdr_result, result)) {
98 svcerr_systemerr (transp);
100 if (!svc_freeargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
101 fprintf (stderr, "%s", "unable to free arguments");
111 uint32_t verf_flavor;
113 uint32_t accept_stat;
116 static void async_rpc_write(RPCConnection *rpc,
117 const char *buf, gsize len);
118 static void async_rpc_flush(RPCConnection *rpc);
120 struct rpc_fail_reply {
124 uint32_t verf_flavor;
126 uint32_t accept_stat;
130 async_rpc_send_failure(RPCRequest *req, enum accept_stat stat)
132 struct rpc_fail_reply header;
134 g_atomic_int_add(&outstanding_rpcs, -1);
136 header.xid = htonl(req->xid);
137 header.type = htonl(1); /* REPLY */
138 header.stat = htonl(MSG_ACCEPTED);
139 header.verf_flavor = 0;
141 header.accept_stat = htonl(stat);
143 g_mutex_lock(req->connection->send_lock);
144 uint32_t fragment = htonl(sizeof(header) | 0x80000000);
145 if (!req->connection->udp_transport)
146 async_rpc_write(req->connection, (const char *)&fragment,
148 async_rpc_write(req->connection, (const char *)&header, sizeof(header));
149 async_rpc_flush(req->connection);
150 g_mutex_unlock(req->connection->send_lock);
152 if (req->args != NULL) {
155 xdrmem_create(&xdr, buf, sizeof(buf), XDR_FREE);
156 if (!req->xdr_args_free(&xdr, req->args)) {
157 fprintf(stderr, "unable to free arguments");
162 if (req->raw_args != NULL)
163 g_string_free(req->raw_args, TRUE);
165 while (req->cleanup != NULL) {
166 struct cleanup_list *c = req->cleanup;
167 req->cleanup = c->next;
172 if (req->connection->udp_transport) {
173 /* For UDP, a connection only exists for the duration of a single
175 g_mutex_free(req->connection->send_lock);
176 g_string_free(req->connection->sendbuf, TRUE);
177 g_free(req->connection);
184 async_rpc_send_reply(RPCRequest *req, void *result)
186 bluesky_time_hires time_end;
188 GString *str = g_string_new("");
190 xdr_string_create(&xdr_out, str, XDR_ENCODE);
191 if (!req->xdr_result(&xdr_out, result)) {
192 async_rpc_send_failure(req, SYSTEM_ERR);
193 g_string_free(str, TRUE);
197 g_atomic_int_add(&outstanding_rpcs, -1);
198 bluesky_stats_add(rpc_send_stats, str->len);
200 struct rpc_reply header;
201 header.xid = htonl(req->xid);
202 header.type = htonl(1); /* REPLY */
203 header.stat = htonl(MSG_ACCEPTED);
204 header.verf_flavor = 0;
206 header.accept_stat = 0;
208 g_mutex_lock(req->connection->send_lock);
209 gsize msg_size = str->len;
210 uint32_t fragment = htonl((msg_size + sizeof(header)) | 0x80000000);
211 if (!req->connection->udp_transport)
212 async_rpc_write(req->connection, (const char *)&fragment,
214 async_rpc_write(req->connection, (const char *)&header, sizeof(header));
215 async_rpc_write(req->connection, str->str, str->len);
216 async_rpc_flush(req->connection);
217 g_mutex_unlock(req->connection->send_lock);
219 time_end = bluesky_now_hires();
222 printf("RPC[%"PRIx32"]: time = %"PRId64" ns\n",
223 req->xid, time_end - req->time_start);
227 g_string_free(str, TRUE);
229 if (req->args != NULL) {
232 xdrmem_create(&xdr, buf, sizeof(buf), XDR_FREE);
233 if (!req->xdr_args_free(&xdr, req->args)) {
234 fprintf(stderr, "unable to free arguments");
239 if (req->raw_args != NULL)
240 g_string_free(req->raw_args, TRUE);
242 while (req->cleanup != NULL) {
243 struct cleanup_list *c = req->cleanup;
244 req->cleanup = c->next;
249 if (req->connection->udp_transport) {
250 /* For UDP, a connection only exists for the duration of a single
252 g_mutex_free(req->connection->send_lock);
253 g_string_free(req->connection->sendbuf, TRUE);
254 g_free(req->connection);
260 static const char *nfs_proc_names[] = {
261 [NFSPROC3_NULL] = "NULL",
262 [NFSPROC3_GETATTR] = "GETATTR",
263 [NFSPROC3_SETATTR] = "SETATTR",
264 [NFSPROC3_LOOKUP] = "LOOKUP",
265 [NFSPROC3_ACCESS] = "ACCESS",
266 [NFSPROC3_READLINK] = "READLINK",
267 [NFSPROC3_READ] = "READ",
268 [NFSPROC3_WRITE] = "WRITE",
269 [NFSPROC3_CREATE] = "CREATE",
270 [NFSPROC3_MKDIR] = "MKDIR",
271 [NFSPROC3_SYMLINK] = "SYMLINK",
272 [NFSPROC3_MKNOD] = "MKNOD",
273 [NFSPROC3_REMOVE] = "REMOVE",
274 [NFSPROC3_RMDIR] = "RMDIR",
275 [NFSPROC3_RENAME] = "RENAME",
276 [NFSPROC3_LINK] = "LINK",
277 [NFSPROC3_READDIR] = "READDIR",
278 [NFSPROC3_READDIRPLUS] = "READDIRPLUS",
279 [NFSPROC3_FSSTAT] = "FSSTAT",
280 [NFSPROC3_FSINFO] = "FSINFO",
281 [NFSPROC3_PATHCONF] = "PATHCONF",
282 [NFSPROC3_COMMIT] = "COMMIT",
286 nfs_program_3(RPCRequest *req)
288 RPCConnection *connection = req->connection;
289 uint32_t xid = req->xid;
290 const char *msg_buf = req->raw_args->str + req->raw_args_header_bytes;
291 size_t msg_len = req->raw_args->len - req->raw_args_header_bytes;
294 nfs_fh3 nfsproc3_getattr_3_arg;
295 setattr3args nfsproc3_setattr_3_arg;
296 diropargs3 nfsproc3_lookup_3_arg;
297 access3args nfsproc3_access_3_arg;
298 nfs_fh3 nfsproc3_readlink_3_arg;
299 read3args nfsproc3_read_3_arg;
300 write3args nfsproc3_write_3_arg;
301 create3args nfsproc3_create_3_arg;
302 mkdir3args nfsproc3_mkdir_3_arg;
303 symlink3args nfsproc3_symlink_3_arg;
304 mknod3args nfsproc3_mknod_3_arg;
305 diropargs3 nfsproc3_remove_3_arg;
306 diropargs3 nfsproc3_rmdir_3_arg;
307 rename3args nfsproc3_rename_3_arg;
308 link3args nfsproc3_link_3_arg;
309 readdir3args nfsproc3_readdir_3_arg;
310 readdirplus3args nfsproc3_readdirplus_3_arg;
311 nfs_fh3 nfsproc3_fsstat_3_arg;
312 nfs_fh3 nfsproc3_fsinfo_3_arg;
313 nfs_fh3 nfsproc3_pathconf_3_arg;
314 commit3args nfsproc3_commit_3_arg;
317 xdrproc_t _xdr_argument, _xdr_result;
318 char *(*local)(char *, RPCRequest *);
321 if (req->req_proc < sizeof(nfs_proc_names) / sizeof(const char *)) {
322 printf("Dispatched NFS RPC message type %s\n",
323 nfs_proc_names[req->req_proc]);
325 printf("Dispatched unknown NFS RPC message type %d\n", req->req_proc);
329 switch (req->req_proc) {
331 _xdr_argument = (xdrproc_t) xdr_void;
332 _xdr_result = (xdrproc_t) xdr_void;
333 local = (char *(*)(char *, RPCRequest *)) nfsproc3_null_3_svc;
336 case NFSPROC3_GETATTR:
337 _xdr_argument = (xdrproc_t) xdr_nfs_fh3;
338 _xdr_result = (xdrproc_t) xdr_getattr3res;
339 local = (char *(*)(char *, RPCRequest *)) nfsproc3_getattr_3_svc;
342 case NFSPROC3_SETATTR:
343 _xdr_argument = (xdrproc_t) xdr_setattr3args;
344 _xdr_result = (xdrproc_t) xdr_wccstat3;
345 local = (char *(*)(char *, RPCRequest *)) nfsproc3_setattr_3_svc;
348 case NFSPROC3_LOOKUP:
349 _xdr_argument = (xdrproc_t) xdr_diropargs3;
350 _xdr_result = (xdrproc_t) xdr_lookup3res;
351 local = (char *(*)(char *, RPCRequest *)) nfsproc3_lookup_3_svc;
354 case NFSPROC3_ACCESS:
355 _xdr_argument = (xdrproc_t) xdr_access3args;
356 _xdr_result = (xdrproc_t) xdr_access3res;
357 local = (char *(*)(char *, RPCRequest *)) nfsproc3_access_3_svc;
360 case NFSPROC3_READLINK:
361 _xdr_argument = (xdrproc_t) xdr_nfs_fh3;
362 _xdr_result = (xdrproc_t) xdr_readlink3res;
363 local = (char *(*)(char *, RPCRequest *)) nfsproc3_readlink_3_svc;
367 _xdr_argument = (xdrproc_t) xdr_read3args;
368 _xdr_result = (xdrproc_t) xdr_read3res;
369 local = (char *(*)(char *, RPCRequest *)) nfsproc3_read_3_svc;
373 _xdr_argument = (xdrproc_t) xdr_write3args;
374 _xdr_result = (xdrproc_t) xdr_write3res;
375 local = (char *(*)(char *, RPCRequest *)) nfsproc3_write_3_svc;
378 case NFSPROC3_CREATE:
379 _xdr_argument = (xdrproc_t) xdr_create3args;
380 _xdr_result = (xdrproc_t) xdr_diropres3;
381 local = (char *(*)(char *, RPCRequest *)) nfsproc3_create_3_svc;
385 _xdr_argument = (xdrproc_t) xdr_mkdir3args;
386 _xdr_result = (xdrproc_t) xdr_diropres3;
387 local = (char *(*)(char *, RPCRequest *)) nfsproc3_mkdir_3_svc;
390 case NFSPROC3_SYMLINK:
391 _xdr_argument = (xdrproc_t) xdr_symlink3args;
392 _xdr_result = (xdrproc_t) xdr_diropres3;
393 local = (char *(*)(char *, RPCRequest *)) nfsproc3_symlink_3_svc;
397 _xdr_argument = (xdrproc_t) xdr_mknod3args;
398 _xdr_result = (xdrproc_t) xdr_diropres3;
399 local = (char *(*)(char *, RPCRequest *)) nfsproc3_mknod_3_svc;
402 case NFSPROC3_REMOVE:
403 _xdr_argument = (xdrproc_t) xdr_diropargs3;
404 _xdr_result = (xdrproc_t) xdr_wccstat3;
405 local = (char *(*)(char *, RPCRequest *)) nfsproc3_remove_3_svc;
409 _xdr_argument = (xdrproc_t) xdr_diropargs3;
410 _xdr_result = (xdrproc_t) xdr_wccstat3;
411 local = (char *(*)(char *, RPCRequest *)) nfsproc3_rmdir_3_svc;
414 case NFSPROC3_RENAME:
415 _xdr_argument = (xdrproc_t) xdr_rename3args;
416 _xdr_result = (xdrproc_t) xdr_rename3res;
417 local = (char *(*)(char *, RPCRequest *)) nfsproc3_rename_3_svc;
421 _xdr_argument = (xdrproc_t) xdr_link3args;
422 _xdr_result = (xdrproc_t) xdr_link3res;
423 local = (char *(*)(char *, RPCRequest *)) nfsproc3_link_3_svc;
426 case NFSPROC3_READDIR:
427 _xdr_argument = (xdrproc_t) xdr_readdir3args;
428 _xdr_result = (xdrproc_t) xdr_readdir3res;
429 local = (char *(*)(char *, RPCRequest *)) nfsproc3_readdir_3_svc;
432 case NFSPROC3_READDIRPLUS:
433 _xdr_argument = (xdrproc_t) xdr_readdirplus3args;
434 _xdr_result = (xdrproc_t) xdr_readdirplus3res;
435 local = (char *(*)(char *, RPCRequest *)) nfsproc3_readdirplus_3_svc;
438 case NFSPROC3_FSSTAT:
439 _xdr_argument = (xdrproc_t) xdr_nfs_fh3;
440 _xdr_result = (xdrproc_t) xdr_fsstat3res;
441 local = (char *(*)(char *, RPCRequest *)) nfsproc3_fsstat_3_svc;
444 case NFSPROC3_FSINFO:
445 _xdr_argument = (xdrproc_t) xdr_nfs_fh3;
446 _xdr_result = (xdrproc_t) xdr_fsinfo3res;
447 local = (char *(*)(char *, RPCRequest *)) nfsproc3_fsinfo_3_svc;
450 case NFSPROC3_PATHCONF:
451 _xdr_argument = (xdrproc_t) xdr_nfs_fh3;
452 _xdr_result = (xdrproc_t) xdr_pathconf3res;
453 local = (char *(*)(char *, RPCRequest *)) nfsproc3_pathconf_3_svc;
456 case NFSPROC3_COMMIT:
457 _xdr_argument = (xdrproc_t) xdr_commit3args;
458 _xdr_result = (xdrproc_t) xdr_commit3res;
459 local = (char *(*)(char *, RPCRequest *)) nfsproc3_commit_3_svc;
463 async_rpc_send_failure(req, PROC_UNAVAIL);
467 /* Decode incoming message */
468 req->xdr_args_free = _xdr_argument;
469 req->args = g_new0(union argtype, 1);
471 xdrmem_create(&xdr_in, (char *)msg_buf, msg_len, XDR_DECODE);
472 if (!_xdr_argument(&xdr_in, req->args)) {
473 async_rpc_send_failure(req, GARBAGE_ARGS);
474 fprintf(stderr, "RPC decode error!\n");
478 /* Perform the call. */
479 req->xdr_result = _xdr_result;
480 result = (*local)((char *)req->args, req);
485 /* Enhanced, asynchronous-friendly RPC layer. This is a replacement for the
486 * built-in sunrpc parsing and dispatch that will allow for processing multiple
487 * requests at the same time. */
488 static GMainContext *main_context;
489 static GMainLoop *main_loop;
491 static GThreadPool *rpc_thread_pool;
493 static volatile int fs_dump_requested = 0;
495 static void sig_handler(int sig)
497 if (sig == SIGUSR1) {
498 fs_dump_requested = 1;
502 static gboolean async_flushd(gpointer data)
505 int rpc_count = g_atomic_int_get(&outstanding_rpcs);
506 if (rpc_count != 0) {
507 g_print("Currently outstanding RPC requests: %d\n", rpc_count);
511 if (fs_dump_requested) {
512 bluesky_debug_dump(fs);
513 bluesky_stats_dump_all();
514 fs_dump_requested = 0;
517 bluesky_flushd_invoke(fs);
521 static void async_rpc_task(gpointer data, gpointer user_data)
523 nfs_program_3((RPCRequest *)data);
526 static async_rpc_init()
528 main_context = g_main_context_new();
529 main_loop = g_main_loop_new(main_context, FALSE);
531 rpc_thread_pool = g_thread_pool_new(async_rpc_task, NULL,
532 bluesky_max_threads, FALSE, NULL);
534 /* Arrange to have the cache writeback code run every five seconds. */
535 GSource *source = g_timeout_source_new_seconds(5);
536 g_source_set_callback(source, async_flushd, NULL, NULL);
537 g_source_attach(source, main_context);
538 g_source_unref(source);
540 /* Signal USR1 is used to request a debugging dump of filesyste info */
542 sa.sa_handler = sig_handler;
543 sigemptyset(&sa.sa_mask);
544 sa.sa_flags = SA_RESTART;
545 if (sigaction(SIGUSR1, &sa, NULL) < 0) {
550 struct rpc_call_header {
564 /* Decode an RPC message and process it. Returns a boolean indicating whether
565 * the message could be processed; if false, an unrecoverable error occurred
566 * and the transport should be closed. */
567 static gboolean async_rpc_dispatch(RPCConnection *rpc)
569 bluesky_time_hires time_start = bluesky_now_hires();
571 GString *msg = rpc->msgbuf;
572 const char *buf = msg->str;
574 bluesky_stats_add(rpc_recv_stats, msg->len);
576 if (msg->len < sizeof(struct rpc_call_header)) {
577 fprintf(stderr, "Short RPC message: only %zd bytes!\n", msg->len);
581 struct rpc_call_header *header = (struct rpc_call_header *)(msg->str);
582 uint32_t xid = ntohl(header->xid);
584 if (ntohl(header->mtype) != 0) {
585 /* Not an RPC call */
589 if (ntohl(header->rpcvers) != 2) {
593 g_atomic_int_add(&outstanding_rpcs, 1);
595 RPCRequest *req = g_new0(RPCRequest, 1);
596 req->connection = rpc;
597 req->time_start = time_start;
600 if (ntohl(header->prog) != NFS_PROGRAM) {
601 async_rpc_send_failure(req, PROG_UNAVAIL);
603 } else if (ntohl(header->vers) != NFS_V3) {
604 /* FIXME: Should be PROG_MISMATCH */
605 async_rpc_send_failure(req, PROG_UNAVAIL);
609 uint32_t proc = ntohl(header->proc);
611 /* Next, skip over authentication headers. */
612 buf += sizeof(struct rpc_call_header);
613 for (i = 0; i < 2; i++) {
614 struct rpc_auth *auth = (struct rpc_auth *)buf;
615 if (buf - msg->str + sizeof(struct rpc_auth) > msg->len) {
616 g_atomic_int_add(&outstanding_rpcs, -1);
620 gsize authsize = ntohl(auth->len) + sizeof(struct rpc_auth);
621 if (authsize > MAX_RPC_MSGSIZE) {
622 g_atomic_int_add(&outstanding_rpcs, -1);
629 if (buf - msg->str > msg->len) {
630 g_atomic_int_add(&outstanding_rpcs, -1);
635 req->raw_args_header_bytes = buf - msg->str;
636 req->req_proc = ntohl(header->proc);
637 rpc->msgbuf = g_string_new("");
639 if (bluesky_options.sync_frontends) {
642 g_thread_pool_push(rpc_thread_pool, req, NULL);
648 /* Write the given data to the RPC socket. */
649 static void async_rpc_write(RPCConnection *rpc,
650 const char *buf, gsize len)
652 if (rpc->udp_transport) {
653 g_string_append_len(rpc->sendbuf, buf, len);
657 /* Normal TCP path */
660 switch (g_io_channel_write_chars(rpc->channel, buf, len,
662 case G_IO_STATUS_ERROR:
663 case G_IO_STATUS_EOF:
664 case G_IO_STATUS_AGAIN:
665 fprintf(stderr, "Error writing to socket!\n");
667 case G_IO_STATUS_NORMAL:
674 // g_io_channel_flush(rpc->channel, NULL);
677 /* Flush a completed message out to the RPC socket */
678 static void async_rpc_flush(RPCConnection *rpc)
680 if (rpc->udp_transport) {
681 sendto(g_io_channel_unix_get_fd(rpc->channel),
682 rpc->sendbuf->str, rpc->sendbuf->len, 0,
683 (struct sockaddr *)&rpc->peer, sizeof(struct sockaddr_in));
686 g_io_channel_flush(rpc->channel, NULL);
690 static gboolean async_rpc_do_read(GIOChannel *channel,
691 GIOCondition condition,
694 RPCConnection *rpc = (RPCConnection *)data;
696 gsize bytes_to_read = 0; /* Number of bytes to attempt to read. */
698 /* If we have not yet read in the fragment header, do that first. This is
699 * 4 bytes that indicates the number of bytes in the message to follow
700 * (with the high bit set if this is the last fragment making up the
702 if (rpc->frag_len == 0) {
703 bytes_to_read = 4 - rpc->frag_hdr_bytes;
705 bytes_to_read = rpc->frag_len & 0x7fffffff;
708 if (bytes_to_read > MAX_RPC_MSGSIZE
709 || rpc->msgbuf->len + bytes_to_read > MAX_RPC_MSGSIZE)
711 fprintf(stderr, "Excessive fragment size for RPC: %zd bytes\n",
713 g_io_channel_shutdown(rpc->channel, TRUE, NULL);
717 gsize bytes_read = 0;
718 g_string_set_size(rpc->msgbuf, rpc->msgbuf->len + bytes_to_read);
719 char *buf = &rpc->msgbuf->str[rpc->msgbuf->len - bytes_to_read];
720 switch (g_io_channel_read_chars(rpc->channel, buf,
721 bytes_to_read, &bytes_read, NULL)) {
722 case G_IO_STATUS_NORMAL:
724 case G_IO_STATUS_AGAIN:
726 case G_IO_STATUS_EOF:
727 if (bytes_read == bytes_to_read)
729 /* else fall through */
730 case G_IO_STATUS_ERROR:
731 fprintf(stderr, "Unexpected error or end of file on RPC stream %d!\n",
732 g_io_channel_unix_get_fd(rpc->channel));
733 g_io_channel_shutdown(rpc->channel, TRUE, NULL);
734 /* TODO: Clean up connection object. */
738 g_assert(bytes_read >= 0 && bytes_read <= bytes_to_read);
740 g_string_set_size(rpc->msgbuf,
741 rpc->msgbuf->len - (bytes_to_read - bytes_read));
743 if (rpc->frag_len == 0) {
744 /* Handle reading in the fragment header. If we've read the complete
745 * header, store the fragment size. */
746 rpc->frag_hdr_bytes += bytes_read;
747 if (rpc->frag_hdr_bytes == 4) {
748 memcpy((char *)&rpc->frag_len,
749 &rpc->msgbuf->str[rpc->msgbuf->len - 4], 4);
750 rpc->frag_len = ntohl(rpc->frag_len);
751 g_string_set_size(rpc->msgbuf, rpc->msgbuf->len - 4);
752 rpc->frag_hdr_bytes = 0;
755 /* We were reading in the fragment body. */
756 rpc->frag_len -= bytes_read;
758 if (rpc->frag_len == 0x80000000) {
759 /* We have a complete message since this was the last fragment and
760 * there are no more bytes in it. Dispatch the message. */
761 if (!async_rpc_dispatch(rpc)) {
762 fprintf(stderr, "Invalid RPC message, closing channel\n");
763 g_io_channel_shutdown(rpc->channel, TRUE, NULL);
767 g_string_set_size(rpc->msgbuf, 0);
774 static gboolean async_rpc_do_accept(GIOChannel *channel,
775 GIOCondition condition,
778 int fd = g_io_channel_unix_get_fd(channel);
779 struct sockaddr_in addr;
780 socklen_t addrlen = sizeof(addr);
782 g_print("Received new connection on fd %d!\n", fd);
783 int nfd = accept(fd, (struct sockaddr *)&addr, &addrlen);
785 fprintf(stderr, "Error accepting connection: %m\n");
789 RPCConnection *rpc = g_new0(RPCConnection, 1);
790 rpc->channel = g_io_channel_unix_new(nfd);
791 rpc->msgbuf = g_string_new("");
792 g_io_channel_set_encoding(rpc->channel, NULL, NULL);
793 rpc->send_lock = g_mutex_new();
794 GSource *source = g_io_create_watch(rpc->channel, G_IO_IN);
795 g_source_set_callback(source, (GSourceFunc)async_rpc_do_read,
797 g_source_attach(source, main_context);
798 g_source_unref(source);
803 static async_rpc_register_listening(int fd)
805 GIOChannel *channel = g_io_channel_unix_new(fd);
806 g_io_channel_set_encoding(channel, NULL, NULL);
807 GSource *source = g_io_create_watch(channel, G_IO_IN);
808 g_source_set_callback(source, (GSourceFunc)async_rpc_do_accept,
810 g_source_attach(source, main_context);
811 g_source_unref(source);
814 static gboolean async_rpc_do_udp(GIOChannel *channel,
815 GIOCondition condition,
820 struct sockaddr_in src;
821 socklen_t addrlen = sizeof(struct sockaddr_in);
822 ssize_t len = recvfrom(g_io_channel_unix_get_fd(channel),
824 (struct sockaddr *)&src, &addrlen);
826 fprintf(stderr, "UDP read error: %m, shutting down UDP\n");
830 g_assert(len < sizeof(buf));
832 RPCConnection *rpc = g_new0(RPCConnection, 1);
833 rpc->channel = channel;
834 rpc->msgbuf = g_string_new_len(buf, len);
835 rpc->send_lock = g_mutex_new();
836 rpc->udp_transport = TRUE;
837 memcpy(&rpc->peer, &src, sizeof(struct sockaddr_in));
838 rpc->sendbuf = g_string_new("");
840 /* We have a complete message since this was the last fragment and
841 * there are no more bytes in it. Dispatch the message. */
842 async_rpc_dispatch(rpc);
847 static async_rpc_register_listening_udp(int fd)
849 GIOChannel *channel = g_io_channel_unix_new(fd);
850 g_io_channel_set_encoding(channel, NULL, NULL);
851 GSource *source = g_io_create_watch(channel, G_IO_IN);
852 g_source_set_callback(source, (GSourceFunc)async_rpc_do_udp,
854 g_source_attach(source, main_context);
855 g_source_unref(source);
858 static gpointer async_rpc_run(gpointer data)
860 g_print("Starting NFS main loop...\n");
861 g_main_loop_run(main_loop);
868 rpc_recv_stats = bluesky_stats_new("NFS RPC Messages In");
869 rpc_send_stats = bluesky_stats_new("NFS RPC Messages Out");
874 pmap_unset (MOUNT_PROGRAM, MOUNT_V3);
876 transp = svcudp_create(RPC_ANYSOCK);
877 if (transp == NULL) {
878 fprintf(stderr, "%s", "cannot create udp service.");
881 if (!svc_register(transp, MOUNT_PROGRAM, MOUNT_V3, mount_program_3, IPPROTO_UDP)) {
882 fprintf(stderr, "%s", "unable to register (MOUNT_PROGRAM, MOUNT_V3, udp).");
886 transp = svctcp_create(RPC_ANYSOCK, 0, 0);
887 if (transp == NULL) {
888 fprintf(stderr, "%s", "cannot create tcp service.");
891 if (!svc_register(transp, MOUNT_PROGRAM, MOUNT_V3, mount_program_3, IPPROTO_TCP)) {
892 fprintf(stderr, "%s", "unable to register (MOUNT_PROGRAM, MOUNT_V3, tcp).");
896 /* NFS protocol (version 3) */
897 pmap_unset (NFS_PROGRAM, NFS_V3);
899 int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
901 fprintf(stderr, "Unable to create NFS TCP socket: %m\n");
906 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&n, sizeof(n));
908 struct sockaddr_in addr;
909 addr.sin_family = AF_INET;
910 addr.sin_port = htons(NFS_SERVICE_PORT);
911 addr.sin_addr.s_addr = INADDR_ANY;
912 if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
913 fprintf(stderr, "Unable to bind to NFS TCP address: %m\n");
917 if (listen(fd, SOMAXCONN) < 0) {
918 fprintf(stderr, "Unable to listen on NFS TCP socket: %m\n");
922 if (!pmap_set(NFS_PROGRAM, NFS_V3, IPPROTO_TCP, NFS_SERVICE_PORT)) {
923 fprintf(stderr, "Could not register NFS RPC service!\n");
927 async_rpc_register_listening(fd);
929 /* Minimal UDP NFSv3 support */
930 fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
932 fprintf(stderr, "Unable to create NFS UDP socket: %m\n");
936 addr.sin_family = AF_INET;
937 addr.sin_port = htons(NFS_SERVICE_PORT);
938 addr.sin_addr.s_addr = INADDR_ANY;
939 if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
940 fprintf(stderr, "Unable to bind to NFS UDP address: %m\n");
944 if (!pmap_set(NFS_PROGRAM, NFS_V3, IPPROTO_UDP, NFS_SERVICE_PORT)) {
945 fprintf(stderr, "Could not register NFS UDP RPC service!\n");
949 async_rpc_register_listening_udp(fd);
951 g_thread_create(async_rpc_run, NULL, TRUE, NULL);