client.c

   1 /*
   2  * Copyright (C) 1997-2013 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 int 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                 return ret;
  68         sz = btr_next_buffer(btrn, &buf);
  69         if (sz <= 1)
  70                 goto out;
  71         et->result_buf = para_realloc(et->result_buf, et->result_size + sz - 1);
  72         memcpy(et->result_buf + et->result_size - 1, buf, sz -  1);
  73         et->result_size += sz - 1;
  74         et->result_buf[et->result_size - 1] = '\0';
  75 out:
  76         btr_consume(btrn, sz);
  77         return 0;
  78 }
  79
  80 static int make_client_argv(const char *line)
  81 {
  82         int ret;
  83
  84         free_argv(ct->conf.inputs);
  85         ret = create_argv(line, " ", &ct->conf.inputs);
  86         if (ret >= 0)
  87                 ct->conf.inputs_num = ret;
  88         return ret;
  89 }
  90
  91 static int execute_client_command(const char *cmd, char **result)
  92 {
  93         int ret;
  94         struct sched command_sched = {.default_timeout = {.tv_sec = 1}};
  95         struct exec_task exec_task = {
  96                 .task = {
  97                         .pre_select = exec_pre_select,
  98                         .post_select = exec_post_select,
  99                         .status = "client exec task",
 100                 },
 101                 .result_buf = para_strdup(""),
 102                 .result_size = 1,
 103         };
 104         *result = NULL;
 105         ret = make_client_argv(cmd);
 106         if (ret < 0)
 107                 goto out;
 108         exec_task.btrn = btr_new_node(&(struct btr_node_description)
 109                 EMBRACE(.name = "exec_collect"));
 110         register_task(&command_sched, &exec_task.task);
 111         ret = client_connect(ct, &command_sched, NULL, exec_task.btrn);
 112         if (ret < 0)
 113                 goto out;
 114         schedule(&command_sched);
 115         *result = exec_task.result_buf;
 116         btr_remove_node(&exec_task.btrn);
 117         client_disconnect(ct);
 118         ret = 1;
 119 out:
 120         btr_remove_node(&exec_task.btrn);
 121         if (ret < 0)
 122                 free(exec_task.result_buf);
 123         return ret;
 124 }
 125
 126 static int extract_matches_from_command(const char *word, char *cmd,
 127                 char ***matches)
 128 {
 129         char *buf, **sl;
 130         int ret;
 131
 132         ret = execute_client_command(cmd, &buf);
 133         if (ret < 0)
 134                 return ret;
 135         ret = create_argv(buf, "\n", &sl);
 136         free(buf);
 137         if (ret < 0)
 138                 return ret;
 139         ret = i9e_extract_completions(word, sl, matches);
 140         free_argv(sl);
 141         return ret;
 142 }
 143
 144 static int complete_attributes(const char *word, char ***matches)
 145 {
 146         return extract_matches_from_command(word, "lsatt", matches);
 147 }
 148
 149 static void complete_addblob(__a_unused const char *blob_type,
 150                 __a_unused struct i9e_completion_info *ci,
 151                 __a_unused struct i9e_completion_result *cr)
 152 {
 153         cr->filename_completion_desired = true;
 154 }
 155
 156 static void generic_blob_complete(const char *blob_type,
 157                 struct i9e_completion_info *ci,
 158                 struct i9e_completion_result *cr)
 159 {
 160         char cmd[20];
 161         sprintf(cmd, "ls%s", blob_type);
 162         extract_matches_from_command(ci->word, cmd, &cr->matches);
 163 }
 164
 165 static void complete_catblob(const char *blob_type,
 166                 struct i9e_completion_info *ci,
 167                 struct i9e_completion_result *cr)
 168 {
 169         generic_blob_complete(blob_type, ci, cr);
 170 }
 171
 172 static void complete_lsblob(const char *blob_type,
 173                 struct i9e_completion_info *ci,
 174                 struct i9e_completion_result *cr)
 175 {
 176         char *opts[] = {"-i", "-l", "-r", NULL};
 177
 178         if (ci->word[0] == '-')
 179                 return i9e_complete_option(opts, ci, cr);
 180         generic_blob_complete(blob_type, ci, cr);
 181 }
 182
 183 static void complete_rmblob(const char *blob_type,
 184                 struct i9e_completion_info *ci,
 185                 struct i9e_completion_result *cr)
 186 {
 187         generic_blob_complete(blob_type, ci, cr);
 188 }
 189
 190 static void complete_mvblob(const char *blob_type,
 191                 struct i9e_completion_info *ci,
 192                 struct i9e_completion_result *cr)
 193 {
 194         generic_blob_complete(blob_type, ci, cr);
 195 }
 196
 197 /* these don't need any completions */
 198 I9E_DUMMY_COMPLETER(ff);
 199 I9E_DUMMY_COMPLETER(hup);
 200 I9E_DUMMY_COMPLETER(jmp);
 201 I9E_DUMMY_COMPLETER(next);
 202 I9E_DUMMY_COMPLETER(nomore);
 203 I9E_DUMMY_COMPLETER(pause);
 204 I9E_DUMMY_COMPLETER(play);
 205 I9E_DUMMY_COMPLETER(si);
 206 I9E_DUMMY_COMPLETER(term);
 207 I9E_DUMMY_COMPLETER(version);
 208 I9E_DUMMY_COMPLETER(stop);
 209 I9E_DUMMY_COMPLETER(addatt);
 210 I9E_DUMMY_COMPLETER(init);
 211
 212 static struct i9e_completer completers[];
 213
 214 static void help_completer(struct i9e_completion_info *ci,
 215                 struct i9e_completion_result *result)
 216 {
 217         result->matches = i9e_complete_commands(ci->word, completers);
 218 }
 219
 220 static void stat_completer(struct i9e_completion_info *ci,
 221                 struct i9e_completion_result *cr)
 222 {
 223         char *opts[] = {"-n=", "-p", NULL};
 224         //PARA_CRIT_LOG("word: %s\n", ci->word);
 225         i9e_complete_option(opts, ci, cr);
 226 }
 227
 228 static void sender_completer(struct i9e_completion_info *ci,
 229                 struct i9e_completion_result *cr)
 230 {
 231         char *senders[] = {"http", "dccp", "udp", NULL};
 232         char *http_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 233         char *dccp_cmds[] = {"on", "off", "allow", "deny", "help", NULL};
 234         char *udp_cmds[] ={"on", "off", "add", "delete", "help", NULL};
 235         char *sender;
 236         char **cmds;
 237
 238         //PARA_CRIT_LOG("wn: %d\n", ci->word_num);
 239         if (ci->word_num == 0 || ci->word_num > 3)
 240                 return;
 241         if (ci->word_num == 1 || (ci->word_num == 2 && *ci->word != '\0')) {
 242                 i9e_extract_completions(ci->word, senders, &cr->matches);
 243                 return;
 244         }
 245         sender = ci->argv[1];
 246         //PARA_CRIT_LOG("sender: %s\n", sender);
 247         if (strcmp(sender, "http") == 0)
 248                 cmds = http_cmds;
 249         else if (strcmp(sender, "dccp") == 0)
 250                 cmds = dccp_cmds;
 251         else if (strcmp(sender, "udp") == 0)
 252                 cmds = udp_cmds;
 253         else
 254                 return;
 255         i9e_extract_completions(ci->word, cmds, &cr->matches);
 256 }
 257
 258 static void add_completer(struct i9e_completion_info *ci,
 259                 struct i9e_completion_result *cr)
 260 {
 261         char *opts[] = {"-a", "-l", "-f", "-v", "--", NULL};
 262
 263         if (ci->word[0] == '-')
 264                 i9e_complete_option(opts, ci, cr);
 265         cr->filename_completion_desired = true;
 266 }
 267
 268 static void ls_completer(struct i9e_completion_info *ci,
 269                 struct i9e_completion_result *cr)
 270 {
 271         char *opts[] = {
 272                 "--", "-l", "-ls", "-ll", "-lv", "-lp", "-lm", "-lc", "-p",
 273                 "-a", "-r", "-d", "-sp", "-sl", "-ss", "-sn", "-sf", "-sc",
 274                 "-si", "-sy", "-sb", "-sd", "-sa", NULL
 275         };
 276         if (ci->word[0] == '-')
 277                 i9e_complete_option(opts, ci, cr);
 278         cr->filename_completion_desired = true;
 279 }
 280
 281 static void setatt_completer(struct i9e_completion_info *ci,
 282                 struct i9e_completion_result *cr)
 283 {
 284         char *buf, **sl;
 285         int i, ret, num_atts;
 286
 287         if (ci->word_num == 0)
 288                 return;
 289
 290         if (*ci->word == '/' || *ci->word == '\0')
 291                 cr->filename_completion_desired = true;
 292         if (*ci->word == '/')
 293                 return;
 294         ret = execute_client_command("lsatt", &buf);
 295         if (ret < 0)
 296                 return;
 297         ret = create_argv(buf, "\n", &sl);
 298         if (ret < 0)
 299                 goto out;
 300         num_atts = ret;
 301         sl = para_realloc(sl, (2 * num_atts + 1) * sizeof(char *));
 302         for (i = 0; i < num_atts; i++) {
 303                 char *orig = sl[i];
 304                 sl[i] = make_message("%s+", orig);
 305                 sl[num_atts + i] = make_message("%s-", orig);
 306                 free(orig);
 307         }
 308         sl[2 * num_atts] = NULL;
 309         i9e_extract_completions(ci->word, sl, &cr->matches);
 310 out:
 311         free(buf);
 312         free_argv(sl);
 313 }
 314
 315 static void lsatt_completer(struct i9e_completion_info *ci,
 316                 struct i9e_completion_result *cr)
 317 {
 318         char *opts[] = {"-i", "-l", "-r", NULL};
 319         i9e_complete_option(opts, ci, cr);
 320 }
 321
 322 static void mvatt_completer(struct i9e_completion_info *ci,
 323                 struct i9e_completion_result *cr)
 324 {
 325         complete_attributes(ci->word, &cr->matches);
 326 }
 327
 328 static void rmatt_completer(struct i9e_completion_info *ci,
 329                 struct i9e_completion_result *cr)
 330 {
 331         complete_attributes(ci->word, &cr->matches);
 332 }
 333
 334 static void check_completer(struct i9e_completion_info *ci,
 335                 struct i9e_completion_result *cr)
 336 {
 337         char *opts[] = {"-a", "-m", "-p", NULL};
 338         i9e_complete_option(opts, ci, cr);
 339 }
 340
 341 static void rm_completer(struct i9e_completion_info *ci,
 342                 struct i9e_completion_result *cr)
 343 {
 344         char *opts[] = {"-v", "-f", "-p", NULL};
 345
 346         if (ci->word[0] == '-') {
 347                 i9e_complete_option(opts, ci, cr);
 348                 return;
 349         }
 350         cr->filename_completion_desired = true;
 351 }
 352
 353 static void touch_completer(struct i9e_completion_info *ci,
 354                 struct i9e_completion_result *cr)
 355 {
 356         char *opts[] = {"-n=", "-l=", "-y=", "-i=", "-a=", "-v", "-p", NULL};
 357
 358         if (ci->word[0] == '-')
 359                 i9e_complete_option(opts, ci, cr);
 360         cr->filename_completion_desired = true;
 361 }
 362
 363 static void cpsi_completer(struct i9e_completion_info *ci,
 364                 struct i9e_completion_result *cr)
 365 {
 366         char *opts[] = {"-a", "-y", "-i", "-l", "-n", "-v", NULL};
 367
 368         if (ci->word[0] == '-')
 369                 i9e_complete_option(opts, ci, cr);
 370         cr->filename_completion_desired = true;
 371 }
 372
 373 static void select_completer(struct i9e_completion_info *ci,
 374                 struct i9e_completion_result *cr)
 375 {
 376         char *mood_buf, *pl_buf, **moods, **playlists, **mops;
 377         int num_moods, num_pl, i, n, ret;
 378
 379         ret = execute_client_command("lsmood", &mood_buf);
 380         if (ret < 0)
 381                 return;
 382         ret = execute_client_command("lspl", &pl_buf);
 383         if (ret < 0)
 384                 goto free_mood_buf;
 385
 386         ret = create_argv(mood_buf, "\n", &moods);
 387         if (ret < 0)
 388                 goto free_pl_buf;
 389         num_moods = ret;
 390         ret = create_argv(pl_buf, "\n", &playlists);
 391         if (ret < 0)
 392                 goto free_moods;
 393         num_pl = ret;
 394         n = num_moods + num_pl;
 395         mops = para_malloc((n + 1) * sizeof(char *));
 396         for (i = 0; i < num_moods; i++)
 397                 mops[i] = make_message("m/%s", moods[i]);
 398         for (i = 0; i < num_pl; i++)
 399                 mops[num_moods + i] = make_message("p/%s", playlists[i]);
 400         mops[n] = NULL;
 401         i9e_extract_completions(ci->word, mops, &cr->matches);
 402         free_argv(mops);
 403         free_argv(playlists);
 404 free_moods:
 405         free_argv(moods);
 406 free_pl_buf:
 407         free(pl_buf);
 408 free_mood_buf:
 409         free(mood_buf);
 410 }
 411
 412 #define DEFINE_BLOB_COMPLETER(cmd, blob_type) \
 413         static void cmd ## blob_type ## _completer( \
 414                 struct i9e_completion_info *ci, \
 415                 struct i9e_completion_result *cr) \
 416         {complete_ ## cmd ## blob(#blob_type, ci, cr);}
 417
 418 DEFINE_BLOB_COMPLETER(add, mood)
 419 DEFINE_BLOB_COMPLETER(add, lyr)
 420 DEFINE_BLOB_COMPLETER(add, img)
 421 DEFINE_BLOB_COMPLETER(add, pl)
 422 DEFINE_BLOB_COMPLETER(cat, mood)
 423 DEFINE_BLOB_COMPLETER(cat, lyr)
 424 DEFINE_BLOB_COMPLETER(cat, img)
 425 DEFINE_BLOB_COMPLETER(cat, pl)
 426 DEFINE_BLOB_COMPLETER(ls, mood)
 427 DEFINE_BLOB_COMPLETER(ls, lyr)
 428 DEFINE_BLOB_COMPLETER(ls, img)
 429 DEFINE_BLOB_COMPLETER(ls, pl)
 430 DEFINE_BLOB_COMPLETER(rm, mood)
 431 DEFINE_BLOB_COMPLETER(rm, lyr)
 432 DEFINE_BLOB_COMPLETER(rm, img)
 433 DEFINE_BLOB_COMPLETER(rm, pl)
 434 DEFINE_BLOB_COMPLETER(mv, mood)
 435 DEFINE_BLOB_COMPLETER(mv, lyr)
 436 DEFINE_BLOB_COMPLETER(mv, img)
 437 DEFINE_BLOB_COMPLETER(mv, pl)
 438
 439 static int client_i9e_line_handler(char *line)
 440 {
 441         int ret;
 442
 443         client_disconnect(ct);
 444         PARA_DEBUG_LOG("line: %s\n", line);
 445         ret = make_client_argv(line);
 446         if (ret <= 0)
 447                 return ret;
 448         ret = client_connect(ct, &sched, NULL, NULL);
 449         if (ret < 0)
 450                 return ret;
 451         i9e_attach_to_stdout(ct->btrn);
 452         return 1;
 453 }
 454
 455 static struct i9e_completer completers[] = {
 456         SERVER_COMPLETERS
 457         AFS_COMPLETERS
 458         {.name = NULL}
 459 };
 460
 461 __noreturn static void interactive_session(void)
 462 {
 463         int ret;
 464         char *history_file;
 465         struct sigaction act;
 466         struct i9e_client_info ici = {
 467                 .fds = {0, 1, 2},
 468                 .prompt = "para_client> ",
 469                 .line_handler = client_i9e_line_handler,
 470                 .loglevel = client_loglevel,
 471                 .completers = completers,
 472         };
 473
 474         PARA_NOTICE_LOG("\n%s\n", version_text("client"));
 475         if (ct->conf.history_file_given)
 476                 history_file = para_strdup(ct->conf.history_file_arg);
 477         else {
 478                 char *home = para_homedir();
 479                 history_file = make_message("%s/.paraslash/client.history",
 480                         home);
 481                 free(home);
 482         }
 483         ici.history_file = history_file;
 484
 485         act.sa_handler = i9e_signal_dispatch;
 486         sigemptyset(&act.sa_mask);
 487         act.sa_flags = 0;
 488         sigaction(SIGINT, &act, NULL);
 489         sched.select_function = i9e_select;
 490
 491         ret = i9e_open(&ici, &sched);
 492         if (ret < 0)
 493                 goto out;
 494         para_log = i9e_log;
 495         ret = schedule(&sched);
 496         i9e_close();
 497         para_log = stderr_log;
 498 out:
 499         if (ret < 0)
 500                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 501         exit(ret < 0? EXIT_FAILURE : EXIT_SUCCESS);
 502         //client_close(ct);
 503 }
 504
 505 __noreturn static void print_completions(void)
 506 {
 507         int ret = i9e_print_completions(completers);
 508         exit(ret <= 0? EXIT_FAILURE : EXIT_SUCCESS);
 509 }
 510
 511 #else /* HAVE_READLINE */
 512
 513 __noreturn static void interactive_session(void)
 514 {
 515         PARA_EMERG_LOG("interactive sessions not available\n");
 516         exit(EXIT_FAILURE);
 517 }
 518
 519 __noreturn static void print_completions(void)
 520 {
 521         PARA_EMERG_LOG("command completion not available\n");
 522         exit(EXIT_FAILURE);
 523 }
 524
 525 #endif /* HAVE_READLINE */
 526
 527 static int supervisor_post_select(struct sched *s, __a_unused struct task *t)
 528 {
 529         if (ct->task.error < 0)
 530                 return ct->task.error;
 531         if (ct->status == CL_SENDING) {
 532                 stdin_set_defaults(&sit);
 533                 register_task(s, &sit.task);
 534                 return -E_TASK_STARTED;
 535         }
 536         if (ct->status == CL_RECEIVING) {
 537                 stdout_set_defaults(&sot);
 538                 register_task(s, &sot.task);
 539                 return -E_TASK_STARTED;
 540         }
 541         return 0;
 542 }
 543
 544 static struct task svt = {
 545         .post_select = supervisor_post_select,
 546         .status = "supervisor task"
 547 };
 548
 549 /**
 550  * The client program to connect to para_server.
 551  *
 552  * \param argc Usual argument count.
 553  * \param argv Usual argument vector.
 554  *
 555  * When called without a paraslash command, an interactive session is started.
 556  * Otherwise, the client task and the supervisor task are started. The former
 557  * communicates with para_server while the latter monitors whether the client
 558  * task intends to read from stdin or write to stdout.
 559  *
 560  * Once it has been determined whether the client command corresponds to a
 561  * stdin command (addmood, addimg, ..), either the stdin task or the stdout
 562  * task is set up to replace the supervisor task.
 563  *
 564  * \return EXIT_SUCCESS or EXIT_FAILURE
 565  *
 566  * \sa client_open(), stdin.c, stdout.c, para_client(1), para_server(1)
 567  */
 568 int main(int argc, char *argv[])
 569 {
 570         int ret;
 571
 572         init_random_seed_or_die();
 573         sched.default_timeout.tv_sec = 1;
 574
 575         ret = client_parse_config(argc, argv, &ct, &client_loglevel);
 576         if (ret < 0)
 577                 goto out;
 578         if (ct->conf.complete_given)
 579                 print_completions();
 580         if (ret == 0)
 581                 interactive_session(); /* does not return */
 582
 583         /*
 584          * We add buffer tree nodes for stdin and stdout even though
 585          * only one of them will be needed. This simplifies the code
 586          * a bit wrt. to the buffer tree setup.
 587          */
 588         sit.btrn = btr_new_node(&(struct btr_node_description)
 589                 EMBRACE(.name = "stdin"));
 590         ret = client_connect(ct, &sched, sit.btrn, NULL);
 591         if (ret < 0)
 592                 goto out;
 593         sot.btrn = btr_new_node(&(struct btr_node_description)
 594                 EMBRACE(.name = "stdout", .parent = ct->btrn));
 595         register_task(&sched, &svt);
 596         ret = schedule(&sched);
 597         if (ret >= 0 && ct->task.error < 0) {
 598                 switch(ct->task.error) {
 599                 /* these are not errors */
 600                 case -E_SERVER_CMD_SUCCESS:
 601                 case -E_EOF:
 602                 case -E_SERVER_EOF:
 603                 case -E_BTR_EOF:
 604                         ret = 0;
 605                         break;
 606                 default: ret = -E_SERVER_CMD_FAILURE;
 607                 }
 608         }
 609 out:
 610         if (ret < 0)
 611                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 612         client_close(ct);
 613         btr_remove_node(&sit.btrn);
 614         btr_remove_node(&sot.btrn);
 615         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
 616 }