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         ret = task_get_notification(t);
 337         if (ret < 0)
 338                 goto out;
 339         if (ct->scc.fd < 0)
 340                 return;
 341         switch (ct->status) {
 342         case CL_CONNECTED: /* receive welcome message */
 343                 ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
 344                 if (ret < 0 || n == 0)
 345                         goto out;
 346                 ct->features = parse_features(buf);
 347                 ct->status = CL_RECEIVED_WELCOME;
 348                 return;
 349         case CL_RECEIVED_WELCOME: /* send auth command */
 350                 if (!FD_ISSET(ct->scc.fd, &s->wfds))
 351                         return;
 352                 if (has_feature("sideband", ct)) {
 353                         ct->use_sideband = true;
 354                         sprintf(buf, AUTH_REQUEST_MSG "%s sideband", ct->user);
 355                 } else
 356                         sprintf(buf, AUTH_REQUEST_MSG "%s", ct->user);
 357                 PARA_INFO_LOG("--> %s\n", buf);
 358                 ret = write_buffer(ct->scc.fd, buf);
 359                 if (ret < 0)
 360                         goto out;
 361                 ct->status = CL_SENT_AUTH;
 362                 return;
 363         case CL_SENT_AUTH:
 364                 /*
 365                  * Receive challenge and session keys, decrypt the challenge and
 366                  * send back the hash of the decrypted challenge.
 367                  */
 368                 {
 369                 /* decrypted challenge/session key buffer */
 370                 unsigned char crypt_buf[1024];
 371                 /* the SHA1 of the decrypted challenge */
 372
 373                 if (ct->use_sideband) {
 374                         struct sb_buffer sbb;
 375                         ret = recv_sb(ct, &s->rfds, &sbb);
 376                         if (ret <= 0)
 377                                 goto out;
 378                         if (sbb.band != SBD_CHALLENGE) {
 379                                 ret = -E_BAD_BAND;
 380                                 free(sbb.iov.iov_base);
 381                                         goto out;
 382                         }
 383                         n = sbb.iov.iov_len;
 384                         PARA_INFO_LOG("<-- [challenge] (%zu bytes)\n", n);
 385                         ret = priv_decrypt(ct->key_file, crypt_buf,
 386                                 sbb.iov.iov_base, n);
 387                         free(sbb.iov.iov_base);
 388                         if (ret < 0)
 389                                 goto out;
 390                 } else {
 391                         ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
 392                         if (ret < 0 || n == 0)
 393                                 goto out;
 394                         PARA_INFO_LOG("<-- [challenge] (%zu bytes)\n", n);
 395                         ret = priv_decrypt(ct->key_file, crypt_buf,
 396                                 (unsigned char *)buf, n);
 397                         if (ret < 0)
 398                                 goto out;
 399                 }
 400                 ct->challenge_hash = para_malloc(HASH_SIZE);
 401                 hash_function((char *)crypt_buf, CHALLENGE_SIZE, ct->challenge_hash);
 402                 ct->scc.send = sc_new(crypt_buf + CHALLENGE_SIZE, SESSION_KEY_LEN);
 403                 ct->scc.recv = sc_new(crypt_buf + CHALLENGE_SIZE + SESSION_KEY_LEN,
 404                         SESSION_KEY_LEN);
 405                 hash_to_asc(ct->challenge_hash, buf);
 406                 PARA_INFO_LOG("--> %s\n", buf);
 407                 ct->status = CL_RECEIVED_CHALLENGE;
 408                 return;
 409                 }
 410         case CL_RECEIVED_CHALLENGE:
 411                 if (ct->use_sideband) {
 412                         ret = send_sb(ct, ct->challenge_hash, HASH_SIZE,
 413                                 SBD_CHALLENGE_RESPONSE, false);
 414                         if (ret != 0)
 415                                 ct->challenge_hash = NULL;
 416                         if (ret <= 0)
 417                                 goto out;
 418                 } else {
 419                         ret = write_all(ct->scc.fd, (char *)ct->challenge_hash, HASH_SIZE);
 420                         if (ret < 0)
 421                                 goto out;
 422                 }
 423                 ct->status = CL_SENT_CH_RESPONSE;
 424                 goto out;
 425         case CL_SENT_CH_RESPONSE: /* read server response */
 426                 {
 427                 if (ct->use_sideband) {
 428                         struct sb_buffer sbb;
 429                         ret = recv_sb(ct, &s->rfds, &sbb);
 430                         if (ret <= 0)
 431                                 goto out;
 432                         free(sbb.iov.iov_base);
 433                         if (sbb.band != SBD_PROCEED)
 434                                 ret = -E_BAD_BAND;
 435                         else
 436                                 ct->status = CL_RECEIVED_PROCEED;
 437                         goto out;
 438                 }
 439                 ret = client_recv_buffer(ct, &s->rfds, buf, sizeof(buf), &n);
 440                 if (ret < 0 || n == 0)
 441                         goto out;
 442                 /* check if server has sent "Proceed" message */
 443                 ret = -E_CLIENT_AUTH;
 444                 if (n < PROCEED_MSG_LEN)
 445                         goto out;
 446                 if (!strstr(buf, PROCEED_MSG))
 447                         goto out;
 448                 ct->status = CL_RECEIVED_PROCEED;
 449                 return;
 450                 }
 451         case CL_RECEIVED_PROCEED: /* concat args and send command */
 452                 {
 453                 int i;
 454                 char *command = NULL;
 455                 if (!FD_ISSET(ct->scc.fd, &s->wfds))
 456                         return;
 457                 if (ct->use_sideband) {
 458                         ret = send_sb_command(ct);
 459                         if (ret <= 0)
 460                                 goto out;
 461                         ct->status = CL_SENT_COMMAND;
 462                         return;
 463                 }
 464                 for (i = 0; i < ct->conf.inputs_num; i++) {
 465                         char *tmp = command;
 466                         command = make_message("%s\n%s", command?
 467                                 command : "", ct->conf.inputs[i]);
 468                         free(tmp);
 469                 }
 470                 command = para_strcat(command, EOC_MSG "\n");
 471                 PARA_DEBUG_LOG("--> %s\n", command);
 472                 ret = sc_send_buffer(&ct->scc, command);
 473                 free(command);
 474                 if (ret < 0)
 475                         goto out;
 476                 ct->status = CL_SENT_COMMAND;
 477                 return;
 478                 }
 479         case CL_SENT_COMMAND:
 480                 {
 481                 char *buf2;
 482                 if (ct->use_sideband) {
 483                         struct sb_buffer sbb;
 484                         ret = recv_sb(ct, &s->rfds, &sbb);
 485                         if (ret <= 0)
 486                                 goto out;
 487                         if (sbb.band == SBD_AWAITING_DATA) {
 488                                 ct->status = CL_SENDING;
 489                                 free(sbb.iov.iov_base);
 490                                 goto out;
 491                         }
 492                         ct->status = CL_RECEIVING;
 493                         ret = dispatch_sbb(ct, &sbb);
 494                         goto out;
 495                 }
 496                 /* can not use "buf" here because we need a malloced buffer */
 497                 buf2 = para_malloc(CLIENT_BUFSIZE);
 498                 ret = client_recv_buffer(ct, &s->rfds, buf2, CLIENT_BUFSIZE, &n);
 499                 if (n > 0) {
 500                         if (strstr(buf2, AWAITING_DATA_MSG)) {
 501                                 free(buf2);
 502                                 ct->status = CL_SENDING;
 503                                 return;
 504                         }
 505                         ct->status = CL_RECEIVING;
 506                         btr_add_output(buf2, n, btrn);
 507                 } else
 508                         free(buf2);
 509                 goto out;
 510                 }
 511         case CL_SENDING:
 512                 {
 513                 char *buf2;
 514                 size_t sz;
 515                 ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
 516                 if (ret < 0)
 517                         goto out;
 518                 if (ret == 0)
 519                         return;
 520                 if (!FD_ISSET(ct->scc.fd, &s->wfds))
 521                         return;
 522                 sz = btr_next_buffer(btrn, &buf2);
 523                 ret = sc_send_bin_buffer(&ct->scc, buf2, sz);
 524                 if (ret < 0)
 525                         goto out;
 526                 btr_consume(btrn, sz);
 527                 return;
 528                 }
 529         case CL_RECEIVING:
 530                 {
 531                 char *buf2;
 532                 ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 533                 if (ret < 0)
 534                         goto out;
 535                 if (ret == 0)
 536                         return;
 537                 /*
 538                  * The FD_ISSET() is not strictly necessary, but is allows us
 539                  * to skip the malloc below if there is nothing to read anyway.
 540                  */
 541                 if (!FD_ISSET(ct->scc.fd, &s->rfds))
 542                         return;
 543                 if (ct->use_sideband) {
 544                         struct sb_buffer sbb;
 545                         ret = recv_sb(ct, &s->rfds, &sbb);
 546                         if (ret > 0)
 547                                 ret = dispatch_sbb(ct, &sbb);
 548                         goto out;
 549                 }
 550                 buf2 = para_malloc(CLIENT_BUFSIZE);
 551                 ret = client_recv_buffer(ct, &s->rfds, buf2, CLIENT_BUFSIZE, &n);
 552                 if (n > 0) {
 553                         buf2 = para_realloc(buf2, n);
 554                         btr_add_output(buf2, n, btrn);
 555                 } else
 556                         free(buf2);
 557                 goto out;
 558                 }
 559         }
 560 out:
 561         t->error = ret;
 562         if (ret < 0) {
 563                 if (!ct->use_sideband && ret != -E_SERVER_EOF &&
 564                                 ret != -E_BTR_EOF && ret != -E_EOF)
 565                         PARA_ERROR_LOG("%s\n", para_strerror(-t->error));
 566                 btr_remove_node(&ct->btrn);
 567         }
 568 }
 569
 570 /**
 571  * Connect to para_server and register the client task.
 572  *
 573  * \param ct The initialized client task structure.
 574  * \param s The scheduler instance to register the client task to.
 575  * \param parent The parent node of the client btr node.
 576  * \param child The child node of the client node.
 577  *
 578  * The client task structure given by \a ct  must be allocated and initialized
 579  * by \ref client_parse_config() before this function is called.
 580  *
 581  * \return Standard.
 582  */
 583 int client_connect(struct client_task *ct, struct sched *s,
 584                 struct btr_node *parent, struct btr_node *child)
 585 {
 586         int ret;
 587
 588         PARA_NOTICE_LOG("connecting %s:%d\n", ct->conf.hostname_arg,
 589                 ct->conf.server_port_arg);
 590         ct->scc.fd = -1;
 591         ret = para_connect_simple(IPPROTO_TCP, ct->conf.hostname_arg,
 592                                                ct->conf.server_port_arg);
 593         if (ret < 0)
 594                 return ret;
 595         ct->scc.fd = ret;
 596         ret = mark_fd_nonblocking(ct->scc.fd);
 597         if (ret < 0)
 598                 goto err_out;
 599         ct->status = CL_CONNECTED;
 600         ct->btrn = btr_new_node(&(struct btr_node_description)
 601                 EMBRACE(.name = "client", .parent = parent, .child = child));
 602         ct->task.pre_select = client_pre_select;
 603         ct->task.post_select = client_post_select;
 604         ct->task.error = 0;
 605         sprintf(ct->task.status, "client");
 606         register_task(s, &ct->task);
 607         return 1;
 608 err_out:
 609         close(ct->scc.fd);
 610         ct->scc.fd = -1;
 611         return ret;
 612 }
 613
 614 /**
 615  * Parse a client configuration.
 616  *
 617  * \param argc Usual argument count.
 618  * \param argv Usual argument vector.
 619  * \param ct_ptr Filled in by this function.
 620  * \param loglevel If not \p NULL, the number of the loglevel is stored here.
 621  *
 622  * This checks the command line options given by \a argc and \a argv, sets
 623  * default values for the user name and the name of the rsa key file and reads
 624  * further options from the config file.
 625  *
 626  * Upon successful return, \a ct_ptr points to a dynamically allocated and
 627  * initialized client task struct.
 628  *
 629  * \return The number of non-option arguments in \a argc/argv on success,
 630  * negative on errors.
 631  */
 632 int client_parse_config(int argc, char *argv[], struct client_task **ct_ptr,
 633                 int *loglevel)
 634 {
 635         char *home = para_homedir();
 636         int ret;
 637         struct client_task *ct = para_calloc(sizeof(struct client_task));
 638
 639         *ct_ptr = ct;
 640         ct->scc.fd = -1;
 641         ret = -E_CLIENT_SYNTAX;
 642         if (client_cmdline_parser(argc, argv, &ct->conf))
 643                 goto out;
 644         HANDLE_VERSION_FLAG("client", ct->conf);
 645
 646         ct->config_file = ct->conf.config_file_given?
 647                 para_strdup(ct->conf.config_file_arg) :
 648                 make_message("%s/.paraslash/client.conf", home);
 649         ret = file_exists(ct->config_file);
 650         if (!ret && ct->conf.config_file_given) {
 651                 ret = -E_NO_CONFIG;
 652                 goto out;
 653         }
 654         if (ret) {
 655                 struct client_cmdline_parser_params params = {
 656                         .override = 0,
 657                         .initialize = 0,
 658                         .check_required = 0,
 659                         .check_ambiguity = 0,
 660                         .print_errors = 0
 661                 };
 662                 ret = -E_BAD_CONFIG;
 663                 if (client_cmdline_parser_config_file(ct->config_file,
 664                         &ct->conf, &params))
 665                         goto out;
 666         }
 667         ct->user = ct->conf.user_given?
 668                 para_strdup(ct->conf.user_arg) : para_logname();
 669
 670         if (ct->conf.key_file_given)
 671                 ct->key_file = para_strdup(ct->conf.key_file_arg);
 672         else {
 673                 ct->key_file = make_message("%s/.paraslash/key.%s",
 674                         home, ct->user);
 675                 if (!file_exists(ct->key_file)) {
 676                         free(ct->key_file);
 677                         ct->key_file = make_message("%s/.ssh/id_rsa", home);
 678                 }
 679         }
 680
 681         if (loglevel)
 682                 *loglevel = get_loglevel_by_name(ct->conf.loglevel_arg);
 683         PARA_INFO_LOG("loglevel: %s\n", ct->conf.loglevel_arg);
 684         PARA_INFO_LOG("config_file: %s\n", ct->config_file);
 685         PARA_INFO_LOG("key_file: %s\n", ct->key_file);
 686         ret = ct->conf.inputs_num;
 687 out:
 688         free(home);
 689         if (ret < 0) {
 690                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 691                 client_close(ct);
 692                 *ct_ptr = NULL;
 693         }
 694         return ret;
 695 }
 696
 697 /**
 698  * Parse the client configuration and open a connection to para_server.
 699  *
 700  * \param argc See \ref client_parse_config.
 701  * \param argv See \ref client_parse_config.
 702  * \param ct_ptr See \ref client_parse_config.
 703  * \param loglevel See \ref client_parse_config.
 704  * \param parent See \ref client_connect().
 705  * \param child See \ref client_connect().
 706  * \param sched See \ref client_connect().
 707  *
 708  * This function combines client_parse_config() and client_connect(). It is
 709  * considered a syntax error if no command was given, i.e. if the number
 710  * of non-option arguments is zero.
 711  *
 712  * \return Standard.
 713  */
 714 int client_open(int argc, char *argv[], struct client_task **ct_ptr,
 715                 int *loglevel, struct btr_node *parent, struct btr_node *child,
 716                 struct sched *sched)
 717 {
 718         int ret = client_parse_config(argc, argv, ct_ptr, loglevel);
 719
 720         if (ret < 0)
 721                 return ret;
 722         if (ret == 0) {
 723                 ret = -E_CLIENT_SYNTAX;
 724                 goto fail;
 725         }
 726         ret = client_connect(*ct_ptr, sched, parent, child);
 727         if (ret < 0)
 728                 goto fail;
 729         return 1;
 730 fail:
 731         client_close(*ct_ptr);
 732         *ct_ptr = NULL;
 733         return ret;
 734 }