1 /* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file client_common.c Common functions of para_client and para_audiod. */
5 #include <netinet/in.h>
6 #include <sys/socket.h>
14 #include "client.lsg.h"
26 #include "buffer_tree.h"
29 /** The size of the receiving buffer. */
30 #define CLIENT_BUFSIZE 4000
33 * Close the connection to para_server and free all resources.
35 * \param ct Pointer to the client data.
37 * \sa \ref client_open().
39 void client_close(struct client_task *ct)
45 lls_free_parse_result(ct->lpr, CLIENT_CMD_PTR);
46 free(ct->challenge_hash);
53 * This function asks the scheduler to monitor a file descriptor which
54 * corresponds to an active connection. The descriptor is monitored for either
55 * reading or writing, depending on the state of the connection.
57 * The context pointer is assumed to refer to a client task structure that was
58 * initialized earlier by client_open().
60 static void client_pre_select(struct sched *s, void *context)
63 struct client_task *ct = context;
70 case CL_SENT_CH_RESPONSE:
71 sched_monitor_readfd(ct->scc.fd, s);
74 case CL_RECEIVED_WELCOME:
75 case CL_RECEIVED_PROCEED:
76 case CL_RECEIVED_CHALLENGE:
77 sched_monitor_writefd(ct->scc.fd, s);
82 ret = btr_node_status(ct->btrn[1], 0, BTR_NT_LEAF);
86 sched_monitor_writefd(ct->scc.fd, s);
88 __attribute__ ((fallthrough));
91 ret = btr_node_status(ct->btrn[0], 0, BTR_NT_ROOT);
95 sched_monitor_readfd(ct->scc.fd, s);
101 static int send_sb(struct client_task *ct, int channel, void *buf, size_t numbytes,
102 enum sb_designator band, bool dont_free)
104 int ret, fd = ct->scc.fd;
107 if (!ct->sbc[channel]) {
108 struct sb_buffer sbb;
109 sb_transformation trafo = ct->status < CL_RECEIVED_PROCEED?
111 sbb = (typeof(sbb))SBB_INIT(band, buf, numbytes);
112 ct->sbc[channel] = sb_new_send(&sbb, dont_free, trafo, ct->scc.send);
114 ret = sb_get_send_buffers(ct->sbc[channel], iov);
115 ret = xwritev(fd, iov, ret);
117 sb_free(ct->sbc[channel]);
118 ct->sbc[channel] = NULL;
121 if (sb_sent(ct->sbc[channel], ret)) {
122 ct->sbc[channel] = NULL;
128 static int recv_sb(struct client_task *ct, struct sb_buffer *result)
132 sb_transformation trafo;
136 if (ct->status < CL_SENT_CH_RESPONSE)
137 trafo = trafo_context = NULL;
140 trafo_context = ct->scc.recv;
143 ct->sbc[0] = sb_new_recv(0, trafo, trafo_context);
145 sb_get_recv_buffer(ct->sbc[0], &iov);
146 ret = read_nonblock(ct->scc.fd, iov.iov_base, iov.iov_len, &n);
154 ret = sb_received(ct->sbc[0], n, result);
164 static char **parse_features(char *buf)
167 const char id[] = "\nFeatures: ";
168 char *p, *q, **features;
178 create_argv(p, ",", &features);
179 for (i = 0; features[i]; i++)
180 PARA_INFO_LOG("server feature: %s\n", features[i]);
184 static int dispatch_sbb(struct client_task *ct, struct sb_buffer *sbb)
187 const char *designator[] = {SB_DESIGNATORS_ARRAY};
191 if (sbb->band < NUM_SB_DESIGNATORS)
192 PARA_DEBUG_LOG("band: %s\n", designator[sbb->band]);
195 case SBD_AWAITING_DATA:
196 ct->status = CL_SENDING;
200 if (iov_valid(&sbb->iov))
201 btr_add_output(sbb->iov.iov_base, sbb->iov.iov_len,
208 case SBD_WARNING_LOG:
212 if (iov_valid(&sbb->iov)) {
213 int ll = sbb->band - SBD_DEBUG_LOG;
214 para_log(ll, "remote: %s", (char *)sbb->iov.iov_base);
218 case SBD_EXIT__SUCCESS:
219 ret = -E_SERVER_CMD_SUCCESS;
221 case SBD_EXIT__FAILURE:
222 ret = -E_SERVER_CMD_FAILURE;
225 PARA_ERROR_LOG("invalid band %d\n", sbb->band);
230 free(sbb->iov.iov_base);
232 sbb->iov.iov_base = NULL;
236 static int send_sb_command(struct client_task *ct)
241 unsigned num_inputs = lls_num_inputs(ct->lpr);
244 return send_sb(ct, 0, NULL, 0, 0, false);
246 for (i = 0; i < num_inputs; i++)
247 len += strlen(lls_input(i, ct->lpr)) + 1;
248 p = command = para_malloc(len);
249 for (i = 0; i < num_inputs; i++) {
250 const char *str = lls_input(i, ct->lpr);
252 p += strlen(str) + 1;
254 PARA_DEBUG_LOG("--> %s\n", command);
255 return send_sb(ct, 0, command, len, SBD_COMMAND, false);
258 static bool has_feature(const char *feature, struct client_task *ct)
260 return find_arg(feature, ct->features) >= 0? true : false;
264 * This function reads or writes to the socket file descriptor which
265 * corresponds to an established connection between the client and the server.
266 * It depends on the current state of the connection and on the readiness of
267 * the socket file descriptor which type of I/O is going to be performed.
268 * Besides the initial handshake and authentication, the function sends the
269 * server command and receives the output from the server, if any.
271 * The context pointer refers to a client task structure that was initialized
272 * earlier by client_open().
274 static int client_post_select(struct sched *s, void *context)
276 struct client_task *ct = context;
279 char buf[CLIENT_BUFSIZE];
281 ret = task_get_notification(ct->task);
286 switch (ct->status) {
287 case CL_CONNECTED: /* receive welcome message */
288 ret = read_nonblock(ct->scc.fd, buf, sizeof(buf), &n);
289 if (ret < 0 || n == 0)
291 ct->features = parse_features(buf);
292 ct->status = CL_RECEIVED_WELCOME;
294 case CL_RECEIVED_WELCOME: /* send auth command */
297 * Use sha256 iff the server announced the feature. After 0.7.0
298 * we may request and use the feature unconditionally. After
299 * 0.8.0 we no longer need to request the feature.
302 if (!sched_write_ok(ct->scc.fd, s))
304 has_sha256 = has_feature("sha256", ct);
305 sprintf(buf, AUTH_REQUEST_MSG "%s%s", ct->user, has_sha256?
307 PARA_INFO_LOG("--> %s\n", buf);
308 ret = write_buffer(ct->scc.fd, buf);
311 ct->status = CL_SENT_AUTH;
316 * Receive challenge and session keys, decrypt the challenge and
317 * send back the hash of the decrypted challenge.
320 /* decrypted challenge/session key buffer */
321 unsigned char crypt_buf[1024];
322 struct sb_buffer sbb;
324 ret = recv_sb(ct, &sbb);
327 if (sbb.band != SBD_CHALLENGE) {
329 free(sbb.iov.iov_base);
333 PARA_INFO_LOG("<-- [challenge] (%zu bytes)\n", n);
334 ret = apc_priv_decrypt(ct->key_file, crypt_buf,
335 sbb.iov.iov_base, n);
336 free(sbb.iov.iov_base);
339 ct->challenge_hash = para_malloc(HASH2_SIZE);
341 if (has_feature("sha256", ct)) {
342 hash2_function((char *)crypt_buf, APC_CHALLENGE_SIZE, ct->challenge_hash);
343 hash2_to_asc(ct->challenge_hash, buf);
345 hash_function((char *)crypt_buf, APC_CHALLENGE_SIZE, ct->challenge_hash);
346 hash_to_asc(ct->challenge_hash, buf);
348 ct->scc.send = sc_new(crypt_buf + APC_CHALLENGE_SIZE, SESSION_KEY_LEN);
349 ct->scc.recv = sc_new(crypt_buf + APC_CHALLENGE_SIZE + SESSION_KEY_LEN,
351 PARA_INFO_LOG("--> %s\n", buf);
352 ct->status = CL_RECEIVED_CHALLENGE;
355 case CL_RECEIVED_CHALLENGE:
356 if (has_feature("sha256", ct))
357 ret = send_sb(ct, 0, ct->challenge_hash, HASH2_SIZE,
358 SBD_CHALLENGE_RESPONSE, false);
360 ret = send_sb(ct, 0, ct->challenge_hash, HASH_SIZE,
361 SBD_CHALLENGE_RESPONSE, false);
363 ct->challenge_hash = NULL;
366 ct->status = CL_SENT_CH_RESPONSE;
368 case CL_SENT_CH_RESPONSE: /* read server response */
370 struct sb_buffer sbb;
371 ret = recv_sb(ct, &sbb);
374 free(sbb.iov.iov_base);
375 if (sbb.band != SBD_PROCEED)
378 ct->status = CL_RECEIVED_PROCEED;
381 case CL_RECEIVED_PROCEED: /* concat args and send command */
383 if (!sched_write_ok(ct->scc.fd, s))
385 ret = send_sb_command(ct);
388 ct->status = CL_EXECUTING;
395 ret = btr_node_status(ct->btrn[1], 0, BTR_NT_LEAF);
396 if (ret == -E_BTR_EOF) {
397 /* empty blob data packet indicates EOF */
398 PARA_INFO_LOG("blob sent\n");
399 ret = send_sb(ct, 1, NULL, 0, SBD_BLOB_DATA, true);
405 if (ret > 0 && sched_write_ok(ct->scc.fd, s)) {
406 sz = btr_next_buffer(ct->btrn[1], &buf2);
408 ret = send_sb(ct, 1, buf2, sz, SBD_BLOB_DATA, true);
412 btr_consume(ct->btrn[1], sz);
415 __attribute__ ((fallthrough));
418 ret = btr_node_status(ct->btrn[0], 0, BTR_NT_ROOT);
421 if (ret > 0 && sched_read_ok(ct->scc.fd, s)) {
422 struct sb_buffer sbb;
423 ret = recv_sb(ct, &sbb);
427 ret = dispatch_sbb(ct, &sbb);
437 PARA_INFO_LOG("channel 1: %s\n", para_strerror(-ret));
438 btr_remove_node(&ct->btrn[1]);
443 PARA_INFO_LOG("channel 0: %s\n", para_strerror(-ret));
444 btr_remove_node(&ct->btrn[0]);
445 if (ct->btrn[1] && ct->status == CL_SENDING)
450 btr_remove_node(&ct->btrn[0]);
451 btr_remove_node(&ct->btrn[1]);
452 PARA_NOTICE_LOG("closing connection (%s)\n", para_strerror(-ret));
453 if (ct->scc.fd >= 0) {
457 free_argv(ct->features);
459 sc_free(ct->scc.recv);
461 sc_free(ct->scc.send);
467 * Connect to para_server and register the client task.
469 * \param ct The initialized client task structure.
470 * \param s The scheduler instance to register the client task to.
471 * \param parent The parent node of the client btr node.
472 * \param child The child node of the client node.
474 * The client task structure given by \a ct must be allocated and initialized
475 * by \ref client_parse_config() before this function is called.
479 int client_connect(struct client_task *ct, struct sched *s,
480 struct btr_node *parent, struct btr_node *child)
483 const char *host = CLIENT_OPT_STRING_VAL(HOSTNAME, ct->lpr);
484 uint32_t port = CLIENT_OPT_UINT32_VAL(SERVER_PORT, ct->lpr);
486 PARA_NOTICE_LOG("connecting %s:%u\n", host, port);
488 ret = para_connect_simple(IPPROTO_TCP, host, port);
492 ret = mark_fd_nonblocking(ct->scc.fd);
495 ct->status = CL_CONNECTED;
496 ct->btrn[0] = btr_new_node(&(struct btr_node_description)
497 EMBRACE(.name = "client recv", .parent = NULL, .child = child));
498 ct->btrn[1] = btr_new_node(&(struct btr_node_description)
499 EMBRACE(.name = "client send", .parent = parent, .child = NULL));
501 ct->task = task_register(&(struct task_info) {
503 .pre_select = client_pre_select,
504 .post_select = client_post_select,
514 static void handle_help_flag(struct lls_parse_result *lpr)
518 if (CLIENT_OPT_GIVEN(DETAILED_HELP, lpr))
519 help = lls_long_help(CLIENT_CMD_PTR);
520 else if (CLIENT_OPT_GIVEN(HELP, lpr))
521 help = lls_short_help(CLIENT_CMD_PTR);
524 printf("%s\n", help);
530 * Parse a client configuration.
532 * \param argc Usual argument count.
533 * \param argv Usual argument vector.
534 * \param ct_ptr Filled in by this function.
535 * \param loglevel If not \p NULL, the number of the loglevel is stored here.
537 * This checks the command line options given by \a argc and \a argv, sets
538 * default values for the user name and the name of the rsa key file and reads
539 * further options from the config file.
541 * Upon successful return, \a ct_ptr points to a dynamically allocated and
542 * initialized client task struct.
544 * \return The number of non-option arguments in \a argc/argv on success,
545 * negative on errors.
547 int client_parse_config(int argc, char *argv[], struct client_task **ct_ptr,
550 const struct lls_command *cmd = CLIENT_CMD_PTR;
551 struct lls_parse_result *lpr;
553 struct client_task *ct;
554 char *kf = NULL, *user, *errctx, *home = para_homedir();
556 ret = lls(lls_parse(argc, argv, cmd, &lpr, &errctx));
559 version_handle_flag("client", CLIENT_OPT_GIVEN(VERSION, lpr));
560 handle_help_flag(lpr);
562 ret = lsu_merge_config_file_options(CLIENT_OPT_STRING_VAL(CONFIG_FILE, lpr),
563 "client.conf", &lpr, cmd, client_suite, 0U /* default flags */);
567 ll = CLIENT_OPT_UINT32_VAL(LOGLEVEL, lpr);
570 user = CLIENT_OPT_GIVEN(USER, lpr)?
571 para_strdup(CLIENT_OPT_STRING_VAL(USER, lpr)) : para_logname();
573 if (CLIENT_OPT_GIVEN(KEY_FILE, lpr))
574 kf = para_strdup(CLIENT_OPT_STRING_VAL(KEY_FILE, lpr));
576 kf = make_message("%s/.paraslash/key.%s", home, user);
577 if (!file_exists(kf)) {
579 kf = make_message("%s/.ssh/id_rsa", home);
582 PARA_INFO_LOG("user: %s\n", user);
583 PARA_INFO_LOG("key file: %s\n", kf);
584 PARA_INFO_LOG("loglevel: %d\n", ll);
585 ct = para_calloc(sizeof(*ct));
591 ret = lls_num_inputs(lpr);
596 PARA_ERROR_LOG("%s\n", errctx);
598 lls_free_parse_result(lpr, cmd);
606 * Parse the client configuration and open a connection to para_server.
608 * \param argc See \ref client_parse_config.
609 * \param argv See \ref client_parse_config.
610 * \param ct_ptr See \ref client_parse_config.
611 * \param loglevel See \ref client_parse_config.
612 * \param parent See \ref client_connect().
613 * \param child See \ref client_connect().
614 * \param sched See \ref client_connect().
616 * This function combines client_parse_config() and client_connect(). It is
617 * considered a syntax error if no command was given, i.e. if the number
618 * of non-option arguments is zero.
622 int client_open(int argc, char *argv[], struct client_task **ct_ptr,
623 int *loglevel, struct btr_node *parent, struct btr_node *child,
626 int ret = client_parse_config(argc, argv, ct_ptr, loglevel);
631 ret = -E_CLIENT_SYNTAX;
634 ret = client_connect(*ct_ptr, sched, parent, child);
639 client_close(*ct_ptr);