client_common.c

   1 /*
   2  * Copyright (C) 1997-2012 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file client_common.c Common functions of para_client and para_audiod. */
   8
   9 #include <regex.h>
  10 #include <sys/types.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "list.h"
  15 #include "sched.h"
  16 #include "client.cmdline.h"
  17 #include "crypt.h"
  18 #include "net.h"
  19 #include "fd.h"
  20 #include "sideband.h"
  21 #include "string.h"
  22 #include "client.cmdline.h"
  23 #include "client.h"
  24 #include "buffer_tree.h"
  25 #include "version.h"
  26
  27 /** The size of the receiving buffer. */
  28 #define CLIENT_BUFSIZE 4000
  29
  30 /**
  31  * Close the connection to para_server and deallocate per-command ressources.
  32  *
  33  * \param ct The client task.
  34  *
  35  * This frees all ressources of the current command but keeps the configuration
  36  * in \p ct->conf.
  37  *
  38  * \sa \ref client_close().
  39  */
  40 void client_disconnect(struct client_task *ct)
  41 {
  42         if (!ct)
  43                 return;
  44         if (ct->scc.fd >= 0)
  45                 close(ct->scc.fd);
  46         free_argv(ct->features);
  47         sc_free(ct->scc.recv);
  48         ct->scc.recv = NULL;
  49         sc_free(ct->scc.send);
  50         ct->scc.send = NULL;
  51         btr_remove_node(&ct->btrn);
  52 }
  53
  54 /**
  55  * Close the connection to para_server and free all resources.
  56  *
  57  * \param ct Pointer to the client data.
  58  *
  59  * \sa \ref client_open(), \ref client_disconnect().
  60  */
  61 void client_close(struct client_task *ct)
  62 {
  63         if (!ct)
  64                 return;
  65         client_disconnect(ct);
  66         free(ct->user);
  67         free(ct->config_file);
  68         free(ct->key_file);
  69         client_cmdline_parser_free(&ct->conf);
  70         free(ct->challenge_hash);
  71         sb_free(ct->sbc);
  72         free(ct);
  73 }
  74
  75 /**
  76  * The preselect hook for server commands.
  77  *
  78  * \param s Pointer to the scheduler.
  79  * \param t Pointer to the task struct for this command.
  80  *
  81  * The task pointer must contain a pointer to the initialized client data
  82  * structure as it is returned by client_open().
  83  *
  84  * This function checks the state of the connection and adds the file descriptor
  85  * of the connection to the read or write fd set of \a s accordingly.
  86  *
  87  * \sa register_task() client_open(), struct sched, struct task.
  88  */
  89 static void client_pre_select(struct sched *s, struct task *t)
  90 {
  91         int ret;
  92         struct client_task *ct = container_of(t, struct client_task, task);
  93         struct btr_node *btrn = ct->btrn;
  94
  95         if (ct->scc.fd < 0)
  96                 return;
  97         switch (ct->status) {
  98         case CL_CONNECTED:
  99         case CL_SENT_AUTH:
 100         case CL_SENT_CH_RESPONSE:
 101         case CL_SENT_COMMAND:
 102                 para_fd_set(ct->scc.fd, &s->rfds, &s->max_fileno);
 103                 return;
 104
 105         case CL_RECEIVED_WELCOME:
 106         case CL_RECEIVED_PROCEED:
 107         case CL_RECEIVED_CHALLENGE:
 108                 para_fd_set(ct->scc.fd, &s->wfds, &s->max_fileno);
 109                 return;
 110
 111         case CL_RECEIVING:
 112                 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 113                 if (ret != 0) {
 114                         if (ret < 0)
 115                                 sched_min_delay(s);
 116                         else
 117                                 para_fd_set(ct->scc.fd, &s->rfds,
 118                                         &s->max_fileno);
 119                 }
 120                 return;
 121         case CL_SENDING:
 122                 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
 123                 if (ret != 0) {
 124                         if (ret < 0)
 125                                 sched_min_delay(s);
 126                         else
 127                                 para_fd_set(ct->scc.fd, &s->wfds,
 128                                         &s->max_fileno);
 129                 }
 130                 return;
 131         }
 132 }
 133
 134 static int client_recv_buffer(struct client_task *ct, fd_set *rfds,
 135                 char *buf, size_t sz, size_t *n)
 136 {
 137         int ret;
 138
 139         if (ct->status < CL_SENT_CH_RESPONSE)
 140                 return read_nonblock(ct->scc.fd, buf, sz, rfds, n);
 141
 142         *n = 0;
 143         ret = sc_recv_buffer(&ct->scc, buf, sz);
 144         /*
 145          * sc_recv_buffer is used with blocking fds elsewhere, so it
 146          * does not use the nonblock-API. Therefore we need to
 147          * check for EOF and EAGAIN.
 148          */
 149         if (ret == 0)
 150                 return -E_SERVER_EOF;
 151         if (ret == -ERRNO_TO_PARA_ERROR(EAGAIN))
 152                 return 0;
 153         if (ret < 0)
 154                 return ret;
 155         *n = ret;
 156         return 0;
 157 }
 158
 159 static int send_sb(struct client_task *ct, void *buf, size_t numbytes,
 160                 enum sb_designator band, bool dont_free)
 161 {
 162         int ret, fd = ct->scc.fd;
 163         struct iovec iov[2];
 164
 165         if (!ct->sbc) {
 166                 struct sb_buffer sbb;
 167                 sb_transformation trafo = ct->status < CL_RECEIVED_PROCEED?
 168                         NULL : sc_trafo;
 169                 sbb = (typeof(sbb))SBB_INIT(band, buf, numbytes);
 170                 ct->sbc = sb_new_send(&sbb, dont_free, trafo, ct->scc.send);
 171         }
 172         ret = sb_get_send_buffers(ct->sbc, iov);
 173         ret = xwritev(fd, iov, ret);
 174         if (ret < 0) {
 175                 sb_free(ct->sbc);
 176                 ct->sbc = NULL;
 177                 return ret;
 178         }
 179         if (sb_sent(ct->sbc, ret)) {
 180                 ct->sbc = NULL;
 181                 return 1;
 182         }
 183         return 0;
 184 }
 185
 186 static int recv_sb(struct client_task *ct, fd_set *rfds,
 187                 struct sb_buffer *result)
 188 {
 189         int ret;
 190         size_t n;
 191         sb_transformation trafo;
 192         void *trafo_context;
 193         struct iovec iov;
 194
 195         if (!FD_ISSET(ct->scc.fd, rfds))
 196                 return 0;
 197         if (ct->status < CL_SENT_CH_RESPONSE)
 198                 trafo = trafo_context = NULL;
 199         else {
 200                 trafo = sc_trafo;
 201                 trafo_context = ct->scc.recv;
 202         }
 203         if (!ct->sbc)
 204                 ct->sbc = sb_new_recv(0, trafo, trafo_context);
 205 again:
 206         sb_get_recv_buffer(ct->sbc, &iov);
 207         ret = read_nonblock(ct->scc.fd, iov.iov_base, iov.iov_len, rfds, &n);
 208         if (ret < 0) {
 209                 sb_free(ct->sbc);
 210                 ct->sbc = NULL;
 211                 return ret;
 212         }
 213         if (n == 0)
 214                 return 0;
 215         if (!sb_received(ct->sbc, n, result))
 216                 goto again;
 217         ct->sbc = NULL;
 218         return 1;
 219 }
 220
 221
 222 static char **parse_features(char *buf)
 223 {
 224         int i;
 225         const char id[] = "\nFeatures: ";
 226         char *p, *q, **features;
 227
 228         p = strstr(buf, id);
 229         if (!p)
 230                 return NULL;
 231         p += strlen(id);
 232         q = strchr(p, '\n');
 233         if (!q)
 234                 return NULL;
 235         *q = '\0';
 236         create_argv(p, ",", &features);
 237         for (i = 0; features[i]; i++)
 238                 PARA_INFO_LOG("server feature: %s\n", features[i]);
 239         return features;
 240 }
 241
 242 static int dispatch_sbb(struct client_task *ct, struct sb_buffer *sbb)
 243 {
 244         int ret;
 245         const char *designator[] = {SB_DESIGNATORS_ARRAY};
 246
 247         if (!sbb)
 248                 return 0;
 249         if (sbb->band < NUM_SB_DESIGNATORS)
 250                 PARA_DEBUG_LOG("band: %s\n", designator[sbb->band]);
 251
 252         switch (sbb->band) {
 253         case SBD_OUTPUT:
 254                 if (iov_valid(&sbb->iov))
 255                         btr_add_output(sbb->iov.iov_base, sbb->iov.iov_len,
 256                                 ct->btrn);
 257                 ret = 1;
 258                 goto out;
 259         case SBD_DEBUG_LOG:
 260         case SBD_INFO_LOG:
 261         case SBD_NOTICE_LOG:
 262         case SBD_WARNING_LOG:
 263         case SBD_ERROR_LOG:
 264         case SBD_CRIT_LOG:
 265         case SBD_EMERG_LOG:
 266                 if (iov_valid(&sbb->iov)) {
 267                         int ll = sbb->band - SBD_DEBUG_LOG;
 268                         para_log(ll, "remote: %s", (char *)sbb->iov.iov_base);
 269                 }
 270                 ret = 1;
 271                 goto deallocate;
 272         case SBD_EXIT__SUCCESS:
 273                 ret = -E_SERVER_CMD_SUCCESS;
 274                 goto deallocate;
 275         case SBD_EXIT__FAILURE:
 276                 ret = -E_SERVER_CMD_FAILURE;
 277                 goto deallocate;
 278         default:
 279                 PARA_ERROR_LOG("invalid band %d\n", sbb->band);
 280                 ret = -E_BAD_BAND;
 281                 goto deallocate;
 282         }
 283 deallocate:
 284         free(sbb->iov.iov_base);
 285 out:
 286         sbb->iov.iov_base = NULL;
 287         return ret;
 288 }
 289
 290 static bool has_feature(const char *feature, struct client_task *ct)
 291 {
 292         return find_arg(feature, ct->features) >= 0? true : false;
 293 }
 294
 295 static int send_sb_command(struct client_task *ct)
 296 {
 297         int i;
 298         char *command, *p;
 299         size_t len = 0;
 300
 301         if (ct->sbc)
 302                 return send_sb(ct, NULL, 0, 0, false);
 303
 304         for (i = 0; i < ct->conf.inputs_num; i++)
 305                 len += strlen(ct->conf.inputs[i]) + 1;
 306         p = command = para_malloc(len);
 307         for (i = 0; i < ct->conf.inputs_num; i++) {
 308                 strcpy(p, ct->conf.inputs[i]);
 309                 p += strlen(ct->conf.inputs[i]) + 1;
 310         }
 311         PARA_DEBUG_LOG("--> %s\n", command);
 312         return send_sb(ct, command, len, SBD_COMMAND, false);
 313 }
 314
 315 /**
 316  * The post select hook for client commands.
 317  *
 318  * \param s Pointer to the scheduler.
 319  * \param t Pointer to the task struct for this command.
 320  *
 321  * Depending on the current state of the connection and the status of the read
 322  * and write fd sets of \a s, this function performs the necessary steps to
 323  * authenticate the connection, to send the command given by \a t->private_data
 324  * and to receive para_server's output, if any.
 325  *
 326  * \sa struct sched, struct task.
 327  */
 328 static void client_post_select(struct sched *s, struct task *t)
 329 {
 330         struct client_task *ct = container_of(t, struct client_task, task);
 331         struct btr_node *btrn = ct->btrn;
 332         int ret = 0;
 333         size_t n;
 334         char buf[CLIENT_BUFSIZE];
 335
 336         t->error = 0;
 337         if (ct->scc.fd < 0)
 338                 return;
 339         switch (ct->status) {
 340         case CL_CONNECTED: /* receive welcome message */
 341                 ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
 342                 if (ret < 0 || n == 0)
 343                         goto out;
 344                 ct->features = parse_features(buf);
 345                 ct->status = CL_RECEIVED_WELCOME;
 346                 return;
 347         case CL_RECEIVED_WELCOME: /* send auth command */
 348                 if (!FD_ISSET(ct->scc.fd, &s->wfds))
 349                         return;
 350                 if (has_feature("sideband", ct)) {
 351                         ct->use_sideband = true;
 352                         sprintf(buf, AUTH_REQUEST_MSG "%s sideband", ct->user);
 353                 } else
 354                         sprintf(buf, AUTH_REQUEST_MSG "%s", ct->user);
 355                 PARA_INFO_LOG("--> %s\n", buf);
 356                 ret = write_buffer(ct->scc.fd, buf);
 357                 if (ret < 0)
 358                         goto out;
 359                 ct->status = CL_SENT_AUTH;
 360                 return;
 361         case CL_SENT_AUTH:
 362                 /*
 363                  * Receive challenge and session keys, decrypt the challenge and
 364                  * send back the hash of the decrypted challenge.
 365                  */
 366                 {
 367                 /* decrypted challenge/session key buffer */
 368                 unsigned char crypt_buf[1024];
 369                 /* the SHA1 of the decrypted challenge */
 370
 371                 if (ct->use_sideband) {
 372                         struct sb_buffer sbb;
 373                         ret = recv_sb(ct, &s->rfds, &sbb);
 374                         if (ret <= 0)
 375                                 goto out;
 376                         if (sbb.band != SBD_CHALLENGE) {
 377                                 ret = -E_BAD_BAND;
 378                                 free(sbb.iov.iov_base);
 379                                         goto out;
 380                         }
 381                         n = sbb.iov.iov_len;
 382                         PARA_INFO_LOG("<-- [challenge] (%zu bytes)\n", n);
 383                         ret = priv_decrypt(ct->key_file, crypt_buf,
 384                                 sbb.iov.iov_base, n);
 385                         free(sbb.iov.iov_base);
 386                         if (ret < 0)
 387                                 goto out;
 388                 } else {
 389                         ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
 390                         if (ret < 0 || n == 0)
 391                                 goto out;
 392                         PARA_INFO_LOG("<-- [challenge] (%zu bytes)\n", n);
 393                         ret = priv_decrypt(ct->key_file, crypt_buf,
 394                                 (unsigned char *)buf, n);
 395                         if (ret < 0)
 396                                 goto out;
 397                 }
 398                 ct->challenge_hash = para_malloc(HASH_SIZE);
 399                 hash_function((char *)crypt_buf, CHALLENGE_SIZE, ct->challenge_hash);
 400                 ct->scc.send = sc_new(crypt_buf + CHALLENGE_SIZE, SESSION_KEY_LEN);
 401                 ct->scc.recv = sc_new(crypt_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
 402                         SESSION_KEY_LEN);
 403                 hash_to_asc(ct->challenge_hash, buf);
 404                 PARA_INFO_LOG("--> %s\n", buf);
 405                 ct->status = CL_RECEIVED_CHALLENGE;
 406                 return;
 407                 }
 408         case CL_RECEIVED_CHALLENGE:
 409                 if (ct->use_sideband) {
 410                         ret = send_sb(ct, ct->challenge_hash, HASH_SIZE,
 411                                 SBD_CHALLENGE_RESPONSE, false);
 412                         if (ret != 0)
 413                                 ct->challenge_hash = NULL;
 414                         if (ret <= 0)
 415                                 goto out;
 416                 } else {
 417                         ret = write_all(ct->scc.fd, (char *)ct->challenge_hash, HASH_SIZE);
 418                         if (ret < 0)
 419                                 goto out;
 420                 }
 421                 ct->status = CL_SENT_CH_RESPONSE;
 422                 goto out;
 423         case CL_SENT_CH_RESPONSE: /* read server response */
 424                 {
 425                 if (ct->use_sideband) {
 426                         struct sb_buffer sbb;
 427                         ret = recv_sb(ct, &s->rfds, &sbb);
 428                         if (ret <= 0)
 429                                 goto out;
 430                         free(sbb.iov.iov_base);
 431                         if (sbb.band != SBD_PROCEED)
 432                                 ret = -E_BAD_BAND;
 433                         else
 434                                 ct->status = CL_RECEIVED_PROCEED;
 435                         goto out;
 436                 }
 437                 ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
 438                 if (ret < 0 || n == 0)
 439                         goto out;
 440                 /* check if server has sent "Proceed" message */
 441                 ret = -E_CLIENT_AUTH;
 442                 if (n < PROCEED_MSG_LEN)
 443                         goto out;
 444                 if (!strstr(buf, PROCEED_MSG))
 445                         goto out;
 446                 ct->status = CL_RECEIVED_PROCEED;
 447                 return;
 448                 }
 449         case CL_RECEIVED_PROCEED: /* concat args and send command */
 450                 {
 451                 int i;
 452                 char *command = NULL;
 453                 if (!FD_ISSET(ct->scc.fd, &s->wfds))
 454                         return;
 455                 if (ct->use_sideband) {
 456                         ret = send_sb_command(ct);
 457                         if (ret <= 0)
 458                                 goto out;
 459                         ct->status = CL_SENT_COMMAND;
 460                         return;
 461                 }
 462                 for (i = 0; i < ct->conf.inputs_num; i++) {
 463                         char *tmp = command;
 464                         command = make_message("%s\n%s", command?
 465                                 command : "", ct->conf.inputs[i]);
 466                         free(tmp);
 467                 }
 468                 command = para_strcat(command, EOC_MSG "\n");
 469                 PARA_DEBUG_LOG("--> %s\n", command);
 470                 ret = sc_send_buffer(&ct->scc, command);
 471                 free(command);
 472                 if (ret < 0)
 473                         goto out;
 474                 ct->status = CL_SENT_COMMAND;
 475                 return;
 476                 }
 477         case CL_SENT_COMMAND:
 478                 {
 479                 char *buf2;
 480                 if (ct->use_sideband) {
 481                         struct sb_buffer sbb;
 482                         ret = recv_sb(ct, &s->rfds, &sbb);
 483                         if (ret <= 0)
 484                                 goto out;
 485                         if (sbb.band == SBD_AWAITING_DATA) {
 486                                 ct->status = CL_SENDING;
 487                                 free(sbb.iov.iov_base);
 488                                 goto out;
 489                         }
 490                         ct->status = CL_RECEIVING;
 491                         ret = dispatch_sbb(ct, &sbb);
 492                         goto out;
 493                 }
 494                 /* can not use "buf" here because we need a malloced buffer */
 495                 buf2 = para_malloc(CLIENT_BUFSIZE);
 496                 ret = client_recv_buffer(ct, &s->rfds, buf2, CLIENT_BUFSIZE, &n);
 497                 if (n > 0) {
 498                         if (strstr(buf2, AWAITING_DATA_MSG)) {
 499                                 free(buf2);
 500                                 ct->status = CL_SENDING;
 501                                 return;
 502                         }
 503                         ct->status = CL_RECEIVING;
 504                         btr_add_output(buf2, n, btrn);
 505                 } else
 506                         free(buf2);
 507                 goto out;
 508                 }
 509         case CL_SENDING:
 510                 {
 511                 char *buf2;
 512                 size_t sz;
 513                 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
 514                 if (ret < 0)
 515                         goto out;
 516                 if (ret == 0)
 517                         return;
 518                 if (!FD_ISSET(ct->scc.fd, &s->wfds))
 519                         return;
 520                 sz = btr_next_buffer(btrn, &buf2);
 521                 ret = sc_send_bin_buffer(&ct->scc, buf2, sz);
 522                 if (ret < 0)
 523                         goto out;
 524                 btr_consume(btrn, sz);
 525                 return;
 526                 }
 527         case CL_RECEIVING:
 528                 {
 529                 char *buf2;
 530                 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 531                 if (ret < 0)
 532                         goto out;
 533                 if (ret == 0)
 534                         return;
 535                 /*
 536                  * The FD_ISSET() is not strictly necessary, but is allows us
 537                  * to skip the malloc below if there is nothing to read anyway.
 538                  */
 539                 if (!FD_ISSET(ct->scc.fd, &s->rfds))
 540                         return;
 541                 if (ct->use_sideband) {
 542                         struct sb_buffer sbb;
 543                         ret = recv_sb(ct, &s->rfds, &sbb);
 544                         if (ret > 0)
 545                                 ret = dispatch_sbb(ct, &sbb);
 546                         goto out;
 547                 }
 548                 buf2 = para_malloc(CLIENT_BUFSIZE);
 549                 ret = client_recv_buffer(ct, &s->rfds, buf2, CLIENT_BUFSIZE, &n);
 550                 if (n > 0) {
 551                         buf2 = para_realloc(buf2, n);
 552                         btr_add_output(buf2, n, btrn);
 553                 } else
 554                         free(buf2);
 555                 goto out;
 556                 }
 557         }
 558 out:
 559         t->error = ret;
 560         if (ret < 0) {
 561                 if (!ct->use_sideband && ret != -E_SERVER_EOF &&
 562                                 ret != -E_BTR_EOF && ret != -E_EOF)
 563                         PARA_ERROR_LOG("%s\n", para_strerror(-t->error));
 564                 btr_remove_node(&ct->btrn);
 565         }
 566 }
 567
 568 /**
 569  * Connect to para_server and register the client task.
 570  *
 571  * \param ct The initialized client task structure.
 572  * \param s The scheduler instance to register the client task to.
 573  * \param parent The parent node of the client btr node.
 574  * \param child The child node of the client node.
 575  *
 576  * The client task structure given by \a ct  must be allocated and initialized
 577  * by \ref client_parse_config() before this function is called.
 578  *
 579  * \return Standard.
 580  */
 581 int client_connect(struct client_task *ct, struct sched *s,
 582                 struct btr_node *parent, struct btr_node *child)
 583 {
 584         int ret;
 585
 586         PARA_NOTICE_LOG("connecting %s:%d\n", ct->conf.hostname_arg,
 587                 ct->conf.server_port_arg);
 588         ct->scc.fd = -1;
 589         ret = para_connect_simple(IPPROTO_TCP, ct->conf.hostname_arg,
 590                                                ct->conf.server_port_arg);
 591         if (ret < 0)
 592                 return ret;
 593         ct->scc.fd = ret;
 594         ret = mark_fd_nonblocking(ct->scc.fd);
 595         if (ret < 0)
 596                 goto err_out;
 597         ct->status = CL_CONNECTED;
 598         ct->btrn = btr_new_node(&(struct btr_node_description)
 599                 EMBRACE(.name = "client", .parent = parent, .child = child));
 600         ct->task.pre_select = client_pre_select;
 601         ct->task.post_select = client_post_select;
 602         ct->task.error = 0;
 603         sprintf(ct->task.status, "client");
 604         register_task(s, &ct->task);
 605         return 1;
 606 err_out:
 607         close(ct->scc.fd);
 608         ct->scc.fd = -1;
 609         return ret;
 610 }
 611
 612 /**
 613  * Parse a client configuration.
 614  *
 615  * \param argc Usual argument count.
 616  * \param argv Usual argument vector.
 617  * \param ct_ptr Filled in by this function.
 618  * \param loglevel If not \p NULL, the number of the loglevel is stored here.
 619  *
 620  * This checks the command line options given by \a argc and \a argv, sets
 621  * default values for the user name and the name of the rsa key file and reads
 622  * further options from the config file.
 623  *
 624  * Upon successful return, \a ct_ptr points to a dynamically allocated and
 625  * initialized client task struct.
 626  *
 627  * \return The number of non-option arguments in \a argc/argv on success,
 628  * negative on errors.
 629  */
 630 int client_parse_config(int argc, char *argv[], struct client_task **ct_ptr,
 631                 int *loglevel)
 632 {
 633         char *home = para_homedir();
 634         int ret;
 635         struct client_task *ct = para_calloc(sizeof(struct client_task));
 636
 637         *ct_ptr = ct;
 638         ct->scc.fd = -1;
 639         ret = -E_CLIENT_SYNTAX;
 640         if (client_cmdline_parser(argc, argv, &ct->conf))
 641                 goto out;
 642         HANDLE_VERSION_FLAG("client", ct->conf);
 643
 644         ct->config_file = ct->conf.config_file_given?
 645                 para_strdup(ct->conf.config_file_arg) :
 646                 make_message("%s/.paraslash/client.conf", home);
 647         ret = file_exists(ct->config_file);
 648         if (!ret && ct->conf.config_file_given) {
 649                 ret = -E_NO_CONFIG;
 650                 goto out;
 651         }
 652         if (ret) {
 653                 struct client_cmdline_parser_params params = {
 654                         .override = 0,
 655                         .initialize = 0,
 656                         .check_required = 0,
 657                         .check_ambiguity = 0,
 658                         .print_errors = 0
 659                 };
 660                 ret = -E_BAD_CONFIG;
 661                 if (client_cmdline_parser_config_file(ct->config_file,
 662                         &ct->conf, &params))
 663                         goto out;
 664         }
 665         ct->user = ct->conf.user_given?
 666                 para_strdup(ct->conf.user_arg) : para_logname();
 667
 668         if (ct->conf.key_file_given)
 669                 ct->key_file = para_strdup(ct->conf.key_file_arg);
 670         else {
 671                 ct->key_file = make_message("%s/.paraslash/key.%s",
 672                         home, ct->user);
 673                 if (!file_exists(ct->key_file)) {
 674                         free(ct->key_file);
 675                         ct->key_file = make_message("%s/.ssh/id_rsa", home);
 676                 }
 677         }
 678
 679         if (loglevel)
 680                 *loglevel = get_loglevel_by_name(ct->conf.loglevel_arg);
 681         PARA_INFO_LOG("loglevel: %s\n", ct->conf.loglevel_arg);
 682         PARA_INFO_LOG("config_file: %s\n", ct->config_file);
 683         PARA_INFO_LOG("key_file: %s\n", ct->key_file);
 684         ret = ct->conf.inputs_num;
 685 out:
 686         free(home);
 687         if (ret < 0) {
 688                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 689                 client_close(ct);
 690                 *ct_ptr = NULL;
 691         }
 692         return ret;
 693 }
 694
 695 /**
 696  * Parse the client configuration and open a connection to para_server.
 697  *
 698  * \param argc See \ref client_parse_config.
 699  * \param argv See \ref client_parse_config.
 700  * \param ct_ptr See \ref client_parse_config.
 701  * \param loglevel See \ref client_parse_config.
 702  * \param parent See \ref client_connect().
 703  * \param child See \ref client_connect().
 704  * \param sched See \ref client_connect().
 705  *
 706  * This function combines client_parse_config() and client_connect(). It is
 707  * considered a syntax error if no command was given, i.e. if the number
 708  * of non-option arguments is zero.
 709  *
 710  * \return Standard.
 711  */
 712 int client_open(int argc, char *argv[], struct client_task **ct_ptr,
 713                 int *loglevel, struct btr_node *parent, struct btr_node *child,
 714                 struct sched *sched)
 715 {
 716         int ret = client_parse_config(argc, argv, ct_ptr, loglevel);
 717
 718         if (ret < 0)
 719                 return ret;
 720         if (ret == 0) {
 721                 ret = -E_CLIENT_SYNTAX;
 722                 goto fail;
 723         }
 724         ret = client_connect(*ct_ptr, sched, parent, child);
 725         if (ret < 0)
 726                 goto fail;
 727         return 1;
 728 fail:
 729         client_close(*ct_ptr);
 730         *ct_ptr = NULL;
 731         return ret;
 732 }