client.c

   1 /*
   2  * Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>
   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 /** Array of error strings. */
  26 DEFINE_PARA_ERRLIST;
  27
  28 static struct sched sched;
  29 static struct client_task *ct;
  30 static struct stdin_task sit;
  31 static struct stdout_task sot;
  32
  33 static int client_loglevel = LL_ERROR;
  34 DEFINE_STDERR_LOGGER(stderr_log, client_loglevel);
  35 __printf_2_3 void (*para_log)(int, const char*, ...) = stderr_log;
  36
  37 #ifdef HAVE_READLINE
  38 #include "interactive.h"
  39 #include "server.completion.h"
  40 #include "afs.completion.h"
  41
  42 struct exec_task {
  43         struct task *task;
  44         struct btr_node *btrn;
  45         char *result_buf;
  46         size_t result_size;
  47 };
  48
  49 static void exec_pre_select(struct sched *s, void *context)
  50 {
  51         struct exec_task *et = context;
  52         int ret = btr_node_status(et->btrn, 0, BTR_NT_LEAF);
  53
  54         if (ret != 0)
  55                 sched_min_delay(s);
  56 }
  57
  58 static int exec_post_select(__a_unused struct sched *s, void *context)
  59 {
  60         struct exec_task *et = context;
  61         struct btr_node *btrn = et->btrn;
  62         char *buf;
  63         size_t sz;
  64         int ret;
  65
  66         ret = btr_node_status(btrn, 0, BTR_NT_LEAF);
  67         if (ret <= 0)
  68                 return ret;
  69         sz = btr_next_buffer(btrn, &buf);
  70         if (sz <= 1)
  71                 goto out;
  72         et->result_buf = para_realloc(et->result_buf, et->result_size + sz - 1);
  73         memcpy(et->result_buf + et->result_size - 1, buf, sz -  1);
  74         et->result_size += sz - 1;
  75         et->result_buf[et->result_size - 1] = '\0';
  76 out:
  77         btr_consume(btrn, sz);
  78         return 0;
  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                 .result_buf = para_strdup(""),
  98                 .result_size = 1,
  99         };
 100         *result = NULL;
 101         ret = make_client_argv(cmd);
 102         if (ret < 0)
 103                 goto out;
 104         exec_task.btrn = btr_new_node(&(struct btr_node_description)
 105                 EMBRACE(.name = "exec_collect"));
 106         exec_task.task = task_register(&(struct task_info) {
 107                 .name = "client exec",
 108                 .pre_select = exec_pre_select,
 109                 .post_select = exec_post_select,
 110                 .context = &exec_task,
 111         }, &command_sched);
 112         ret = client_connect(ct, &command_sched, NULL, exec_task.btrn);
 113         if (ret < 0)
 114                 goto out;
 115         schedule(&command_sched);
 116         sched_shutdown(&command_sched);
 117         *result = exec_task.result_buf;
 118         btr_remove_node(&exec_task.btrn);
 119         ret = 1;
 120 out:
 121         btr_remove_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(stop);
 209 I9E_DUMMY_COMPLETER(addatt);
 210 I9E_DUMMY_COMPLETER(init);
 211 I9E_DUMMY_COMPLETER(tasks);
 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 version_completer(struct i9e_completion_info *ci,
 222                 struct i9e_completion_result *cr)
 223 {
 224         char *opts[] = {"-v", NULL};
 225         i9e_complete_option(opts, ci, cr);
 226 }
 227
 228 static void stat_completer(struct i9e_completion_info *ci,
 229                 struct i9e_completion_result *cr)
 230 {
 231         char *opts[] = {"-n=", "-p", NULL};
 232         //PARA_CRIT_LOG("word: %s\n", ci->word);
 233         i9e_complete_option(opts, ci, cr);
 234 }
 235
 236 static void sender_completer(struct i9e_completion_info *ci,
 237                 struct i9e_completion_result *cr)
 238 {
 239         char *senders[] = {"http", "dccp", "udp", NULL};
 240         char *http_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 241         char *dccp_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 242         char *udp_cmds[] ={"on", "off", "add", "delete", "help", NULL};
 243         char *sender;
 244         char **cmds;
 245
 246         //PARA_CRIT_LOG("wn: %d\n", ci->word_num);
 247         if (ci->word_num == 0 || ci->word_num > 3)
 248                 return;
 249         if (ci->word_num == 1 || (ci->word_num == 2 && *ci->word != '\0')) {
 250                 i9e_extract_completions(ci->word, senders, &cr->matches);
 251                 return;
 252         }
 253         sender = ci->argv[1];
 254         //PARA_CRIT_LOG("sender: %s\n", sender);
 255         if (strcmp(sender, "http") == 0)
 256                 cmds = http_cmds;
 257         else if (strcmp(sender, "dccp") == 0)
 258                 cmds = dccp_cmds;
 259         else if (strcmp(sender, "udp") == 0)
 260                 cmds = udp_cmds;
 261         else
 262                 return;
 263         i9e_extract_completions(ci->word, cmds, &cr->matches);
 264 }
 265
 266 static void add_completer(struct i9e_completion_info *ci,
 267                 struct i9e_completion_result *cr)
 268 {
 269         char *opts[] = {"-a", "-l", "-f", "-v", "--", NULL};
 270
 271         if (ci->word[0] == '-')
 272                 i9e_complete_option(opts, ci, cr);
 273         cr->filename_completion_desired = true;
 274 }
 275
 276 static void ls_completer(struct i9e_completion_info *ci,
 277                 struct i9e_completion_result *cr)
 278 {
 279         char *opts[] = {
 280                 "--", "-l", "-l=s", "-l=l", "-l=v", "-l=p", "-l=m", "-l=c",
 281                 "-p", "-a", "-r", "-d", "-s=p", "-s=l", "-s=s", "-s=n", "-s=f",
 282                 "-s=c", "-s=i", "-s=y", "-s=b", "-s=d", "-s=a", "-F", "-b", NULL
 283         };
 284         if (ci->word[0] == '-')
 285                 i9e_complete_option(opts, ci, cr);
 286         cr->filename_completion_desired = true;
 287 }
 288
 289 static void setatt_completer(struct i9e_completion_info *ci,
 290                 struct i9e_completion_result *cr)
 291 {
 292         char *buf, **sl;
 293         int i, ret, num_atts;
 294
 295         if (ci->word_num == 0)
 296                 return;
 297
 298         if (*ci->word == '/' || *ci->word == '\0')
 299                 cr->filename_completion_desired = true;
 300         if (*ci->word == '/')
 301                 return;
 302         ret = execute_client_command("lsatt", &buf);
 303         if (ret < 0)
 304                 return;
 305         ret = create_argv(buf, "\n", &sl);
 306         if (ret < 0)
 307                 goto out;
 308         num_atts = ret;
 309         sl = para_realloc(sl, (2 * num_atts + 1) * sizeof(char *));
 310         for (i = 0; i < num_atts; i++) {
 311                 char *orig = sl[i];
 312                 sl[i] = make_message("%s+", orig);
 313                 sl[num_atts + i] = make_message("%s-", orig);
 314                 free(orig);
 315         }
 316         sl[2 * num_atts] = NULL;
 317         i9e_extract_completions(ci->word, sl, &cr->matches);
 318 out:
 319         free(buf);
 320         free_argv(sl);
 321 }
 322
 323 static void lsatt_completer(struct i9e_completion_info *ci,
 324                 struct i9e_completion_result *cr)
 325 {
 326         char *opts[] = {"-i", "-l", "-r", NULL};
 327         i9e_complete_option(opts, ci, cr);
 328 }
 329
 330 static void mvatt_completer(struct i9e_completion_info *ci,
 331                 struct i9e_completion_result *cr)
 332 {
 333         complete_attributes(ci->word, &cr->matches);
 334 }
 335
 336 static void rmatt_completer(struct i9e_completion_info *ci,
 337                 struct i9e_completion_result *cr)
 338 {
 339         complete_attributes(ci->word, &cr->matches);
 340 }
 341
 342 static void check_completer(struct i9e_completion_info *ci,
 343                 struct i9e_completion_result *cr)
 344 {
 345         char *opts[] = {"-a", "-m", "-p", NULL};
 346         i9e_complete_option(opts, ci, cr);
 347 }
 348
 349 static void rm_completer(struct i9e_completion_info *ci,
 350                 struct i9e_completion_result *cr)
 351 {
 352         char *opts[] = {"-v", "-f", "-p", NULL};
 353
 354         if (ci->word[0] == '-') {
 355                 i9e_complete_option(opts, ci, cr);
 356                 return;
 357         }
 358         cr->filename_completion_desired = true;
 359 }
 360
 361 static void touch_completer(struct i9e_completion_info *ci,
 362                 struct i9e_completion_result *cr)
 363 {
 364         char *opts[] = {"-n=", "-l=", "-y=", "-i=", "-a=", "-v", "-p", NULL};
 365
 366         if (ci->word[0] == '-')
 367                 i9e_complete_option(opts, ci, cr);
 368         cr->filename_completion_desired = true;
 369 }
 370
 371 static void cpsi_completer(struct i9e_completion_info *ci,
 372                 struct i9e_completion_result *cr)
 373 {
 374         char *opts[] = {"-a", "-y", "-i", "-l", "-n", "-v", NULL};
 375
 376         if (ci->word[0] == '-')
 377                 i9e_complete_option(opts, ci, cr);
 378         cr->filename_completion_desired = true;
 379 }
 380
 381 static void select_completer(struct i9e_completion_info *ci,
 382                 struct i9e_completion_result *cr)
 383 {
 384         char *mood_buf, *pl_buf, **moods, **playlists, **mops;
 385         int num_moods, num_pl, i, n, ret;
 386
 387         ret = execute_client_command("lsmood", &mood_buf);
 388         if (ret < 0)
 389                 return;
 390         ret = execute_client_command("lspl", &pl_buf);
 391         if (ret < 0)
 392                 goto free_mood_buf;
 393
 394         ret = create_argv(mood_buf, "\n", &moods);
 395         if (ret < 0)
 396                 goto free_pl_buf;
 397         num_moods = ret;
 398         ret = create_argv(pl_buf, "\n", &playlists);
 399         if (ret < 0)
 400                 goto free_moods;
 401         num_pl = ret;
 402         n = num_moods + num_pl;
 403         mops = para_malloc((n + 1) * sizeof(char *));
 404         for (i = 0; i < num_moods; i++)
 405                 mops[i] = make_message("m/%s", moods[i]);
 406         for (i = 0; i < num_pl; i++)
 407                 mops[num_moods + i] = make_message("p/%s", playlists[i]);
 408         mops[n] = NULL;
 409         i9e_extract_completions(ci->word, mops, &cr->matches);
 410         free_argv(mops);
 411         free_argv(playlists);
 412 free_moods:
 413         free_argv(moods);
 414 free_pl_buf:
 415         free(pl_buf);
 416 free_mood_buf:
 417         free(mood_buf);
 418 }
 419
 420 #define DEFINE_BLOB_COMPLETER(cmd, blob_type) \
 421         static void cmd ## blob_type ## _completer( \
 422                 struct i9e_completion_info *ci, \
 423                 struct i9e_completion_result *cr) \
 424         {complete_ ## cmd ## blob(#blob_type, ci, cr);}
 425
 426 DEFINE_BLOB_COMPLETER(add, mood)
 427 DEFINE_BLOB_COMPLETER(add, lyr)
 428 DEFINE_BLOB_COMPLETER(add, img)
 429 DEFINE_BLOB_COMPLETER(add, pl)
 430 DEFINE_BLOB_COMPLETER(cat, mood)
 431 DEFINE_BLOB_COMPLETER(cat, lyr)
 432 DEFINE_BLOB_COMPLETER(cat, img)
 433 DEFINE_BLOB_COMPLETER(cat, pl)
 434 DEFINE_BLOB_COMPLETER(ls, mood)
 435 DEFINE_BLOB_COMPLETER(ls, lyr)
 436 DEFINE_BLOB_COMPLETER(ls, img)
 437 DEFINE_BLOB_COMPLETER(ls, pl)
 438 DEFINE_BLOB_COMPLETER(rm, mood)
 439 DEFINE_BLOB_COMPLETER(rm, lyr)
 440 DEFINE_BLOB_COMPLETER(rm, img)
 441 DEFINE_BLOB_COMPLETER(rm, pl)
 442 DEFINE_BLOB_COMPLETER(mv, mood)
 443 DEFINE_BLOB_COMPLETER(mv, lyr)
 444 DEFINE_BLOB_COMPLETER(mv, img)
 445 DEFINE_BLOB_COMPLETER(mv, pl)
 446
 447 static int client_i9e_line_handler(char *line)
 448 {
 449         int ret;
 450
 451         PARA_DEBUG_LOG("line: %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[0]);
 459         return 1;
 460 }
 461
 462 static struct i9e_completer completers[] = {
 463         SERVER_COMPLETERS
 464         AFS_COMPLETERS
 465         {.name = NULL}
 466 };
 467
 468 __noreturn static void interactive_session(void)
 469 {
 470         int ret;
 471         char *history_file;
 472         struct sigaction act;
 473         struct i9e_client_info ici = {
 474                 .fds = {0, 1, 2},
 475                 .prompt = "para_client> ",
 476                 .line_handler = client_i9e_line_handler,
 477                 .loglevel = client_loglevel,
 478                 .completers = completers,
 479         };
 480
 481         PARA_NOTICE_LOG("\n%s\n", version_text("client"));
 482         if (ct->conf.history_file_given)
 483                 history_file = para_strdup(ct->conf.history_file_arg);
 484         else {
 485                 char *home = para_homedir();
 486                 history_file = make_message("%s/.paraslash/client.history",
 487                         home);
 488                 free(home);
 489         }
 490         ici.history_file = history_file;
 491
 492         act.sa_handler = i9e_signal_dispatch;
 493         sigemptyset(&act.sa_mask);
 494         act.sa_flags = 0;
 495         sigaction(SIGINT, &act, NULL);
 496         sched.select_function = i9e_select;
 497
 498         ret = i9e_open(&ici, &sched);
 499         if (ret < 0)
 500                 goto out;
 501         para_log = i9e_log;
 502         ret = schedule(&sched);
 503         sched_shutdown(&sched);
 504         i9e_close();
 505         para_log = stderr_log;
 506 out:
 507         if (ret < 0)
 508                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 509         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 510         //client_close(ct);
 511 }
 512
 513 __noreturn static void print_completions(void)
 514 {
 515         int ret = i9e_print_completions(completers);
 516         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 517 }
 518
 519 #else /* HAVE_READLINE */
 520
 521 __noreturn static void interactive_session(void)
 522 {
 523         PARA_EMERG_LOG("interactive sessions not available\n");
 524         exit(EXIT_FAILURE);
 525 }
 526
 527 __noreturn static void print_completions(void)
 528 {
 529         PARA_EMERG_LOG("command completion not available\n");
 530         exit(EXIT_FAILURE);
 531 }
 532
 533 #endif /* HAVE_READLINE */
 534
 535 struct supervisor_task {
 536         bool stdout_task_started;
 537         struct task *task;
 538 };
 539
 540 static int supervisor_post_select(struct sched *s, void *context)
 541 {
 542         struct supervisor_task *svt = context;
 543         int ret = task_status(ct->task);
 544
 545         if (ret < 0)
 546                 return ret;
 547         if (!svt->stdout_task_started && ct->status == CL_EXECUTING) {
 548                 stdout_task_register(&sot, s);
 549                 svt->stdout_task_started = true;
 550                 return 1;
 551         }
 552         if (ct->status == CL_SENDING) {
 553                 stdin_task_register(&sit, s);
 554                 return -E_TASK_STARTED;
 555         }
 556         return 0;
 557 }
 558
 559 static struct supervisor_task supervisor_task;
 560
 561 /**
 562  * The client program to connect to para_server.
 563  *
 564  * \param argc Usual argument count.
 565  * \param argv Usual argument vector.
 566  *
 567  * When called without a paraslash command, an interactive session is started.
 568  * Otherwise, the client task and the supervisor task are started. The former
 569  * communicates with para_server while the latter monitors whether the client
 570  * task intends to read from stdin or write to stdout.
 571  *
 572  * Once it has been determined whether the client command corresponds to a
 573  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
 574  * task is set up to replace the supervisor task.
 575  *
 576  * \return EXIT_SUCCESS or EXIT_FAILURE
 577  *
 578  * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
 579  */
 580 int main(int argc, char *argv[])
 581 {
 582         int ret;
 583
 584         init_random_seed_or_die();
 585         sched.default_timeout.tv_sec = 1;
 586
 587         ret = client_parse_config(argc, argv, &ct, &client_loglevel);
 588         if (ret < 0)
 589                 goto out;
 590         if (ct->conf.complete_given)
 591                 print_completions();
 592         if (ret == 0)
 593                 interactive_session(); /* does not return */
 594
 595         /*
 596          * We add buffer tree nodes for stdin and stdout even though
 597          * only one of them will be needed. This simplifies the code
 598          * a bit wrt. to the buffer tree setup.
 599          */
 600         sit.btrn = btr_new_node(&(struct btr_node_description)
 601                 EMBRACE(.name = "stdin"));
 602         ret = client_connect(ct, &sched, sit.btrn, NULL);
 603         if (ret < 0)
 604                 goto out;
 605         sot.btrn = btr_new_node(&(struct btr_node_description)
 606                 EMBRACE(.name = "stdout", .parent = ct->btrn[0]));
 607         supervisor_task.task = task_register(&(struct task_info) {
 608                 .name = "supervisor",
 609                 .post_select = supervisor_post_select,
 610                 .context = &supervisor_task,
 611         }, &sched);
 612
 613         ret = schedule(&sched);
 614         if (ret >= 0) {
 615                 ret = task_status(ct->task);
 616                 if (ret < 0) {
 617                         switch (ret) {
 618                         /* these are not errors */
 619                         case -E_SERVER_CMD_SUCCESS:
 620                         case -E_EOF:
 621                         case -E_SERVER_EOF:
 622                         case -E_BTR_EOF:
 623                                 ret = 0;
 624                                 break;
 625                         default: ret = -E_SERVER_CMD_FAILURE;
 626                         }
 627                 }
 628         }
 629         sched_shutdown(&sched);
 630 out:
 631         if (ret < 0)
 632                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 633         client_close(ct);
 634         btr_remove_node(&sit.btrn);
 635         btr_remove_node(&sot.btrn);
 636         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 637 }