client.c

   1 /*
   2  * Copyright (C) 1997-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file client.c the client program used to connect to para_server */
   8
   9 #include <regex.h>
  10 #include <signal.h>
  11
  12 #include "para.h"
  13 #include "list.h"
  14 #include "sched.h"
  15 #include "crypt.h"
  16 #include "client.cmdline.h"
  17 #include "string.h"
  18 #include "stdin.h"
  19 #include "stdout.h"
  20 #include "client.h"
  21 #include "buffer_tree.h"
  22 #include "error.h"
  23 #include "version.h"
  24
  25 INIT_CLIENT_ERRLISTS;
  26
  27 static struct sched sched;
  28 static struct client_task *ct;
  29 static struct stdin_task sit;
  30 static struct stdout_task sot;
  31
  32 static int client_loglevel = LL_ERROR;
  33 DEFINE_STDERR_LOGGER(stderr_log, client_loglevel);
  34 __printf_2_3 void (*para_log)(int, const char*, ...) = stderr_log;
  35
  36 #ifdef HAVE_READLINE
  37 #include "interactive.h"
  38 #include "server_completion.h"
  39 #include "afs_completion.h"
  40
  41 struct exec_task {
  42         struct task task;
  43         struct btr_node *btrn;
  44         char *result_buf;
  45         size_t result_size;
  46 };
  47
  48 static void exec_pre_select(struct sched *s, struct task *t)
  49 {
  50         struct exec_task *et = container_of(t, struct exec_task, task);
  51         int ret = btr_node_status(et->btrn, 0, BTR_NT_LEAF);
  52
  53         if (ret != 0)
  54                 sched_min_delay(s);
  55 }
  56
  57 static void exec_post_select(__a_unused struct sched *s, struct task *t)
  58 {
  59         struct exec_task *et = container_of(t, struct exec_task, task);
  60         struct btr_node *btrn = et->btrn;
  61         char *buf;
  62         size_t sz;
  63         int ret;
  64
  65         ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
  66         if (ret <= 0) {
  67                 t->error = ret;
  68                 return;
  69         }
  70         sz = btr_next_buffer(btrn, &buf);
  71         if (sz <= 1)
  72                 goto out;
  73         et->result_buf = para_realloc(et->result_buf, et->result_size + sz - 1);
  74         memcpy(et->result_buf + et->result_size - 1, buf, sz -  1);
  75         et->result_size += sz - 1;
  76         et->result_buf[et->result_size - 1] = '\0';
  77 out:
  78         btr_consume(btrn, sz);
  79 }
  80
  81 static int make_client_argv(const char *line)
  82 {
  83         int ret;
  84
  85         free_argv(ct->conf.inputs);
  86         ret = create_argv(line, " ", &ct->conf.inputs);
  87         if (ret >= 0)
  88                 ct->conf.inputs_num = ret;
  89         return ret;
  90 }
  91
  92 static int execute_client_command(const char *cmd, char **result)
  93 {
  94         int ret;
  95         struct sched command_sched = {.default_timeout = {.tv_sec = 1}};
  96         struct exec_task exec_task = {
  97                 .task = {
  98                         .pre_select = exec_pre_select,
  99                         .post_select = exec_post_select,
 100                         .status = "client exec task",
 101                 },
 102                 .result_buf = para_strdup(""),
 103                 .result_size = 1,
 104         };
 105         *result = NULL;
 106         ret = make_client_argv(cmd);
 107         if (ret < 0)
 108                 goto out;
 109         exec_task.btrn = btr_new_node(&(struct btr_node_description)
 110                 EMBRACE(.name = "exec_collect"));
 111         register_task(&command_sched, &exec_task.task);
 112         ret = client_connect(ct, &command_sched, NULL, exec_task.btrn);
 113         if (ret < 0)
 114                 goto out;
 115         schedule(&command_sched);
 116         *result = exec_task.result_buf;
 117         btr_remove_node(exec_task.btrn);
 118         client_disconnect(ct);
 119         ret = 1;
 120 out:
 121         btr_free_node(exec_task.btrn);
 122         if (ret < 0)
 123                 free(exec_task.result_buf);
 124         return ret;
 125 }
 126
 127 static int extract_matches_from_command(const char *word, char *cmd,
 128                 char ***matches)
 129 {
 130         char *buf, **sl;
 131         int ret;
 132
 133         ret = execute_client_command(cmd, &buf);
 134         if (ret < 0)
 135                 return ret;
 136         ret = create_argv(buf, "\n", &sl);
 137         free(buf);
 138         if (ret < 0)
 139                 return ret;
 140         ret = i9e_extract_completions(word, sl, matches);
 141         free_argv(sl);
 142         return ret;
 143 }
 144
 145 static int complete_attributes(const char *word, char ***matches)
 146 {
 147         return extract_matches_from_command(word, "lsatt", matches);
 148 }
 149
 150 static void complete_addblob(__a_unused const char *blob_type,
 151                 __a_unused struct i9e_completion_info *ci,
 152                 __a_unused struct i9e_completion_result *cr)
 153 {
 154         cr->filename_completion_desired = true;
 155 }
 156
 157 static void generic_blob_complete(const char *blob_type,
 158                 struct i9e_completion_info *ci,
 159                 struct i9e_completion_result *cr)
 160 {
 161         char cmd[20];
 162         sprintf(cmd, "ls%s", blob_type);
 163         extract_matches_from_command(ci->word, cmd, &cr->matches);
 164 }
 165
 166 static void complete_catblob(const char *blob_type,
 167                 struct i9e_completion_info *ci,
 168                 struct i9e_completion_result *cr)
 169 {
 170         generic_blob_complete(blob_type, ci, cr);
 171 }
 172
 173 static void complete_lsblob(const char *blob_type,
 174                 struct i9e_completion_info *ci,
 175                 struct i9e_completion_result *cr)
 176 {
 177         char *opts[] = {"-i", "-l", "-r", NULL};
 178
 179         if (ci->word[0] == '-')
 180                 return i9e_complete_option(opts, ci, cr);
 181         generic_blob_complete(blob_type, ci, cr);
 182 }
 183
 184 static void complete_rmblob(const char *blob_type,
 185                 struct i9e_completion_info *ci,
 186                 struct i9e_completion_result *cr)
 187 {
 188         generic_blob_complete(blob_type, ci, cr);
 189 }
 190
 191 static void complete_mvblob(const char *blob_type,
 192                 struct i9e_completion_info *ci,
 193                 struct i9e_completion_result *cr)
 194 {
 195         generic_blob_complete(blob_type, ci, cr);
 196 }
 197
 198 /* these don't need any completions */
 199 I9E_DUMMY_COMPLETER(ff);
 200 I9E_DUMMY_COMPLETER(hup);
 201 I9E_DUMMY_COMPLETER(jmp);
 202 I9E_DUMMY_COMPLETER(next);
 203 I9E_DUMMY_COMPLETER(nomore);
 204 I9E_DUMMY_COMPLETER(pause);
 205 I9E_DUMMY_COMPLETER(play);
 206 I9E_DUMMY_COMPLETER(si);
 207 I9E_DUMMY_COMPLETER(term);
 208 I9E_DUMMY_COMPLETER(version);
 209 I9E_DUMMY_COMPLETER(stop);
 210 I9E_DUMMY_COMPLETER(addatt);
 211 I9E_DUMMY_COMPLETER(init);
 212
 213 static struct i9e_completer completers[];
 214
 215 static void help_completer(struct i9e_completion_info *ci,
 216                 struct i9e_completion_result *result)
 217 {
 218         result->matches = i9e_complete_commands(ci->word, completers);
 219 }
 220
 221 static void stat_completer(struct i9e_completion_info *ci,
 222                 struct i9e_completion_result *cr)
 223 {
 224         char *opts[] = {"-n=", "-p", NULL};
 225         //PARA_CRIT_LOG("word: %s\n", ci->word);
 226         i9e_complete_option(opts, ci, cr);
 227 }
 228
 229 static void sender_completer(struct i9e_completion_info *ci,
 230                 struct i9e_completion_result *cr)
 231 {
 232         char *senders[] = {"http", "dccp", "udp", NULL};
 233         char *http_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 234         char *dccp_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 235         char *udp_cmds[] ={"on", "off", "add", "delete", "help", NULL};
 236         char *sender;
 237         char **cmds;
 238
 239         //PARA_CRIT_LOG("wn: %d\n", ci->word_num);
 240         if (ci->word_num == 0 || ci->word_num > 3)
 241                 return;
 242         if (ci->word_num == 1 || (ci->word_num == 2 && *ci->word != '\0')) {
 243                 i9e_extract_completions(ci->word, senders, &cr->matches);
 244                 return;
 245         }
 246         sender = ci->argv[1];
 247         //PARA_CRIT_LOG("sender: %s\n", sender);
 248         if (strcmp(sender, "http") == 0)
 249                 cmds = http_cmds;
 250         else if (strcmp(sender, "dccp") == 0)
 251                 cmds = dccp_cmds;
 252         else if (strcmp(sender, "udp") == 0)
 253                 cmds = udp_cmds;
 254         else
 255                 return;
 256         i9e_extract_completions(ci->word, cmds, &cr->matches);
 257 }
 258
 259 static void add_completer(struct i9e_completion_info *ci,
 260                 struct i9e_completion_result *cr)
 261 {
 262         char *opts[] = {"-a", "-l", "-f", "-v", "--", NULL};
 263
 264         if (ci->word[0] == '-')
 265                 i9e_complete_option(opts, ci, cr);
 266         cr->filename_completion_desired = true;
 267 }
 268
 269 static void ls_completer(struct i9e_completion_info *ci,
 270                 struct i9e_completion_result *cr)
 271 {
 272         char *opts[] = {
 273                 "--", "-l", "-ls", "-ll", "-lv", "-lp", "-lm", "-lc", "-p",
 274                 "-a", "-r", "-d", "-sp", "-sl", "-ss", "-sn", "-sf", "-sc",
 275                 "-si", "-sy", "-sb", "-sd", "-sa", NULL
 276         };
 277         if (ci->word[0] == '-')
 278                 i9e_complete_option(opts, ci, cr);
 279         cr->filename_completion_desired = true;
 280 }
 281
 282 static void setatt_completer(struct i9e_completion_info *ci,
 283                 struct i9e_completion_result *cr)
 284 {
 285         char *buf, **sl;
 286         int i, ret, num_atts;
 287
 288         if (ci->word_num == 0)
 289                 return;
 290
 291         if (*ci->word == '/' || *ci->word == '\0')
 292                 cr->filename_completion_desired = true;
 293         if (*ci->word == '/')
 294                 return;
 295         ret = execute_client_command("lsatt", &buf);
 296         if (ret < 0)
 297                 return;
 298         ret = create_argv(buf, "\n", &sl);
 299         if (ret < 0)
 300                 goto out;
 301         num_atts = ret;
 302         sl = para_realloc(sl, (2 * num_atts + 1) * sizeof(char *));
 303         for (i = 0; i < num_atts; i++) {
 304                 char *orig = sl[i];
 305                 sl[i] = make_message("%s+", orig);
 306                 sl[num_atts + i] = make_message("%s-", orig);
 307                 free(orig);
 308         }
 309         sl[2 * num_atts] = NULL;
 310         ret = i9e_extract_completions(ci->word, sl, &cr->matches);
 311 out:
 312         free(buf);
 313         free_argv(sl);
 314 }
 315
 316 static void lsatt_completer(struct i9e_completion_info *ci,
 317                 struct i9e_completion_result *cr)
 318 {
 319         char *opts[] = {"-i", "-l", "-r", NULL};
 320
 321         if (ci->word[0] == '-')
 322                 i9e_complete_option(opts, ci, cr);
 323         else
 324                 complete_attributes(ci->word, &cr->matches);
 325 }
 326
 327 static void mvatt_completer(struct i9e_completion_info *ci,
 328                 struct i9e_completion_result *cr)
 329 {
 330         complete_attributes(ci->word, &cr->matches);
 331 }
 332
 333 static void rmatt_completer(struct i9e_completion_info *ci,
 334                 struct i9e_completion_result *cr)
 335 {
 336         complete_attributes(ci->word, &cr->matches);
 337 }
 338
 339 static void check_completer(struct i9e_completion_info *ci,
 340                 struct i9e_completion_result *cr)
 341 {
 342         char *opts[] = {"-a", "-m", "-p", NULL};
 343         i9e_complete_option(opts, ci, cr);
 344 }
 345
 346 static void rm_completer(struct i9e_completion_info *ci,
 347                 struct i9e_completion_result *cr)
 348 {
 349         char *opts[] = {"-v", "-f", "-p", NULL};
 350
 351         if (ci->word[0] == '-') {
 352                 i9e_complete_option(opts, ci, cr);
 353                 return;
 354         }
 355         cr->filename_completion_desired = true;
 356 }
 357
 358 static void touch_completer(struct i9e_completion_info *ci,
 359                 struct i9e_completion_result *cr)
 360 {
 361         char *opts[] = {"-n=", "-l=", "-y=", "-i=", "-a=", "-v", "-p", NULL};
 362
 363         if (ci->word[0] == '-')
 364                 i9e_complete_option(opts, ci, cr);
 365         cr->filename_completion_desired = true;
 366 }
 367
 368 static void cpsi_completer(struct i9e_completion_info *ci,
 369                 struct i9e_completion_result *cr)
 370 {
 371         char *opts[] = {"-a", "-y", "-i", "-l", "-n", "-v", NULL};
 372
 373         if (ci->word[0] == '-')
 374                 i9e_complete_option(opts, ci, cr);
 375         cr->filename_completion_desired = true;
 376 }
 377
 378 static void select_completer(struct i9e_completion_info *ci,
 379                 struct i9e_completion_result *cr)
 380 {
 381         char *mood_buf, *pl_buf, **moods, **playlists, **mops;
 382         int num_moods, num_pl, i, n, ret;
 383
 384         ret = execute_client_command("lsmood", &mood_buf);
 385         if (ret < 0)
 386                 return;
 387         ret = execute_client_command("lspl", &pl_buf);
 388         if (ret < 0)
 389                 goto free_mood_buf;
 390
 391         ret = create_argv(mood_buf, "\n", &moods);
 392         if (ret < 0)
 393                 goto free_pl_buf;
 394         num_moods = ret;
 395         ret = create_argv(pl_buf, "\n", &playlists);
 396         if (ret < 0)
 397                 goto free_moods;
 398         num_pl = ret;
 399         n = num_moods + num_pl;
 400         mops = para_malloc((n + 1) * sizeof(char *));
 401         for (i = 0; i < num_moods; i++)
 402                 mops[i] = make_message("m/%s", moods[i]);
 403         for (i = 0; i < num_pl; i++)
 404                 mops[num_moods + i] = make_message("p/%s", playlists[i]);
 405         mops[n] = NULL;
 406         i9e_extract_completions(ci->word, mops, &cr->matches);
 407         free_argv(mops);
 408         free_argv(playlists);
 409 free_moods:
 410         free_argv(moods);
 411 free_pl_buf:
 412         free(pl_buf);
 413 free_mood_buf:
 414         free(mood_buf);
 415 }
 416
 417 #define DEFINE_BLOB_COMPLETER(cmd, blob_type) \
 418         static void cmd ## blob_type ## _completer( \
 419                 struct i9e_completion_info *ci, \
 420                 struct i9e_completion_result *cr) \
 421         {complete_ ## cmd ## blob(#blob_type, ci, cr);}
 422
 423 DEFINE_BLOB_COMPLETER(add, mood)
 424 DEFINE_BLOB_COMPLETER(add, lyr)
 425 DEFINE_BLOB_COMPLETER(add, img)
 426 DEFINE_BLOB_COMPLETER(add, pl)
 427 DEFINE_BLOB_COMPLETER(cat, mood)
 428 DEFINE_BLOB_COMPLETER(cat, lyr)
 429 DEFINE_BLOB_COMPLETER(cat, img)
 430 DEFINE_BLOB_COMPLETER(cat, pl)
 431 DEFINE_BLOB_COMPLETER(ls, mood)
 432 DEFINE_BLOB_COMPLETER(ls, lyr)
 433 DEFINE_BLOB_COMPLETER(ls, img)
 434 DEFINE_BLOB_COMPLETER(ls, pl)
 435 DEFINE_BLOB_COMPLETER(rm, mood)
 436 DEFINE_BLOB_COMPLETER(rm, lyr)
 437 DEFINE_BLOB_COMPLETER(rm, img)
 438 DEFINE_BLOB_COMPLETER(rm, pl)
 439 DEFINE_BLOB_COMPLETER(mv, mood)
 440 DEFINE_BLOB_COMPLETER(mv, lyr)
 441 DEFINE_BLOB_COMPLETER(mv, img)
 442 DEFINE_BLOB_COMPLETER(mv, pl)
 443
 444 static int client_i9e_line_handler(char *line)
 445 {
 446         int ret;
 447
 448         client_disconnect(ct);
 449         if (!line || !*line)
 450                 return 0;
 451         PARA_DEBUG_LOG("line handler: %s\n", line);
 452         ret = make_client_argv(line);
 453         if (ret < 0)
 454                 return ret;
 455         ret = client_connect(ct, &sched, NULL, NULL);
 456         if (ret < 0)
 457                 return ret;
 458         i9e_attach_to_stdout(ct->btrn);
 459         return 1;
 460 }
 461
 462 static void client_sighandler(int s)
 463 {
 464         i9e_signal_dispatch(s);
 465 }
 466
 467 static struct i9e_completer completers[] = {
 468         SERVER_COMPLETERS
 469         AFS_COMPLETERS
 470         {.name = NULL}
 471 };
 472
 473 __noreturn static void interactive_session(void)
 474 {
 475         int ret;
 476         char *history_file;
 477         struct sigaction act;
 478         struct i9e_client_info ici = {
 479                 .fds = {0, 1, 2},
 480                 .prompt = "para_client> ",
 481                 .line_handler = client_i9e_line_handler,
 482                 .loglevel = client_loglevel,
 483                 .completers = completers,
 484         };
 485
 486         PARA_NOTICE_LOG("\n%s\n", VERSION_TEXT("client"));
 487         if (ct->conf.history_file_given)
 488                 history_file = para_strdup(ct->conf.history_file_arg);
 489         else {
 490                 char *home = para_homedir();
 491                 history_file = make_message("%s/.paraslash/client.history",
 492                         home);
 493                 free(home);
 494         }
 495         ici.history_file = history_file;
 496
 497         act.sa_handler = client_sighandler;
 498         sigemptyset(&act.sa_mask);
 499         act.sa_flags = 0;
 500         sigaction(SIGINT, &act, NULL);
 501         sched.select_function = i9e_select;
 502
 503         ret = i9e_open(&ici, &sched);
 504         if (ret < 0)
 505                 goto out;
 506         para_log = i9e_log;
 507         ret = schedule(&sched);
 508         i9e_close();
 509         para_log = stderr_log;
 510 out:
 511         if (ret < 0)
 512                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 513         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 514         //client_close(ct);
 515 }
 516
 517 __noreturn static void print_completions(void)
 518 {
 519         int ret = i9e_print_completions(completers);
 520         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 521 }
 522
 523 #else /* HAVE_READLINE */
 524
 525 __noreturn static void interactive_session(void)
 526 {
 527         PARA_EMERG_LOG("interactive sessions not available\n");
 528         exit(EXIT_FAILURE);
 529 }
 530
 531 __noreturn static void print_completions(void)
 532 {
 533         PARA_EMERG_LOG("command completion not available\n");
 534         exit(EXIT_FAILURE);
 535 }
 536
 537 #endif /* HAVE_READLINE */
 538
 539 static void supervisor_post_select(struct sched *s, struct task *t)
 540 {
 541         if (ct->task.error < 0) {
 542                 t->error = ct->task.error;
 543                 return;
 544         }
 545         if (ct->status == CL_SENDING) {
 546                 stdin_set_defaults(&sit);
 547                 register_task(s, &sit.task);
 548                 t->error = -E_TASK_STARTED;
 549                 return;
 550         }
 551         if (ct->status == CL_RECEIVING) {
 552                 stdout_set_defaults(&sot);
 553                 register_task(s, &sot.task);
 554                 t->error = -E_TASK_STARTED; return;
 555         }
 556 }
 557
 558 static struct task svt = {
 559         .post_select = supervisor_post_select,
 560         .status = "supervisor task"
 561 };
 562
 563 /**
 564  * The client program to connect to para_server.
 565  *
 566  * \param argc Usual argument count.
 567  * \param argv Usual argument vector.
 568  *
 569  * When called without a paraslash command, an interactive session is started.
 570  * Otherwise, the client task and the supervisor task are started. The former
 571  * communicates with para_server while the latter monitors whether the client
 572  * task intends to read from stdin or write to stdout.
 573  *
 574  * Once it has been determined whether the client command corresponds to a
 575  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
 576  * task is set up to replace the supervisor task.
 577  *
 578  * \return EXIT_SUCCESS or EXIT_FAILURE
 579  *
 580  * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
 581  */
 582 int main(int argc, char *argv[])
 583 {
 584         int ret;
 585
 586         init_random_seed_or_die();
 587         sched.default_timeout.tv_sec = 1;
 588
 589         ret = client_parse_config(argc, argv, &ct, &client_loglevel);
 590         if (ret < 0)
 591                 goto out;
 592         if (ct->conf.complete_given)
 593                 print_completions();
 594         if (ret == 0)
 595                 interactive_session(); /* does not return */
 596
 597         /*
 598          * We add buffer tree nodes for stdin and stdout even though
 599          * only one of them will be needed. This simplifies the code
 600          * a bit wrt. to the buffer tree setup.
 601          */
 602         sit.btrn = btr_new_node(&(struct btr_node_description)
 603                 EMBRACE(.name = "stdin"));
 604         ret = client_open(argc, argv, &ct, &client_loglevel, sit.btrn, NULL, &sched);
 605         if (ret < 0)
 606                 goto out;
 607         sot.btrn = btr_new_node(&(struct btr_node_description)
 608                 EMBRACE(.name = "stdout", .parent = ct->btrn));
 609         register_task(&sched, &svt);
 610         ret = schedule(&sched);
 611 out:
 612         client_close(ct);
 613         btr_free_node(sit.btrn);
 614         btr_free_node(sot.btrn);
 615         if (ret < 0) {
 616                 /* can not use PARA_LOG here because ct is NULL */
 617                 fprintf(stderr, "%s\n", para_strerror(-ret));
 618                 return EXIT_FAILURE;
 619         }
 620         return EXIT_SUCCESS;
 621 }