Console.cpp

   1 /* Cycript - Inlining/Optimizing JavaScript Compiler
   2  * Copyright (C) 2009  Jay Freeman (saurik)
   3 */
   4
   5 /* Modified BSD License {{{ */
   6 /*
   7  *        Redistribution and use in source and binary
   8  * forms, with or without modification, are permitted
   9  * provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the
  12  *    above copyright notice, this list of conditions
  13  *    and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the
  15  *    above copyright notice, this list of conditions
  16  *    and the following disclaimer in the documentation
  17  *    and/or other materials provided with the
  18  *    distribution.
  19  * 3. The name of the author may not be used to endorse
  20  *    or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
  25  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  26  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  34  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  36  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  37 */
  38 /* }}} */
  39
  40 #include "cycript.hpp"
  41
  42 #ifdef CY_EXECUTE
  43 #include "JavaScript.hpp"
  44 #endif
  45
  46 #include <cstdio>
  47 #include <sstream>
  48
  49 #include <setjmp.h>
  50
  51 #ifdef HAVE_READLINE_H
  52 #include <readline.h>
  53 #else
  54 #include <readline/readline.h>
  55 #endif
  56
  57 #ifdef HAVE_HISTORY_H
  58 #include <history.h>
  59 #else
  60 #include <readline/history.h>
  61 #endif
  62
  63 #include <sys/mman.h>
  64
  65 #include <errno.h>
  66 #include <unistd.h>
  67
  68 #include <sys/types.h>
  69 #include <sys/stat.h>
  70 #include <fcntl.h>
  71
  72 #include "Cycript.tab.hh"
  73
  74 #include <sys/types.h>
  75 #include <sys/socket.h>
  76 #include <netinet/in.h>
  77 #include <sys/un.h>
  78 #include <pwd.h>
  79
  80 #include <apr_getopt.h>
  81
  82 #include <dlfcn.h>
  83
  84 static volatile enum {
  85     Working,
  86     Parsing,
  87     Running,
  88     Sending,
  89     Waiting,
  90 } mode_;
  91
  92 static jmp_buf ctrlc_;
  93
  94 static void sigint(int) {
  95     switch (mode_) {
  96         case Working:
  97             return;
  98         case Parsing:
  99             longjmp(ctrlc_, 1);
 100         case Running:
 101             throw "*** Ctrl-C";
 102         case Sending:
 103             return;
 104         case Waiting:
 105             return;
 106     }
 107 }
 108
 109 #if YYDEBUG
 110 static bool bison_;
 111 #endif
 112 static bool strict_;
 113 static bool pretty_;
 114
 115 void Setup(CYDriver &driver, cy::parser &parser) {
 116 #if YYDEBUG
 117     if (bison_)
 118         parser.set_debug_level(1);
 119 #endif
 120     if (strict_)
 121         driver.strict_ = true;
 122 }
 123
 124 void Setup(CYOutput &out, CYDriver &driver, CYOptions &options) {
 125     out.pretty_ = pretty_;
 126     CYContext context(driver.pool_, options);
 127     driver.program_->Replace(context);
 128 }
 129
 130 void Run(int client, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 131     CYPool pool;
 132
 133     const char *json;
 134     if (client == -1) {
 135         mode_ = Running;
 136 #ifdef CY_EXECUTE
 137         json = CYExecute(pool, data);
 138 #else
 139         json = NULL;
 140 #endif
 141         mode_ = Working;
 142         if (json != NULL)
 143             size = strlen(json);
 144     } else {
 145         mode_ = Sending;
 146         CYSendAll(client, &size, sizeof(size));
 147         CYSendAll(client, data, size);
 148         mode_ = Waiting;
 149         CYRecvAll(client, &size, sizeof(size));
 150         if (size == _not(size_t))
 151             json = NULL;
 152         else {
 153             char *temp(new(pool) char[size + 1]);
 154             CYRecvAll(client, temp, size);
 155             temp[size] = '\0';
 156             json = temp;
 157         }
 158         mode_ = Working;
 159     }
 160
 161     if (json != NULL && fout != NULL) {
 162         if (!expand || json[0] != '"' && json[0] != '\'')
 163             fputs(json, fout);
 164         else for (size_t i(0); i != size; ++i)
 165             if (json[i] != '\\')
 166                 fputc(json[i], fout);
 167             else switch(json[++i]) {
 168                 case '\0': goto done;
 169                 case '\\': fputc('\\', fout); break;
 170                 case '\'': fputc('\'', fout); break;
 171                 case '"': fputc('"', fout); break;
 172                 case 'b': fputc('\b', fout); break;
 173                 case 'f': fputc('\f', fout); break;
 174                 case 'n': fputc('\n', fout); break;
 175                 case 'r': fputc('\r', fout); break;
 176                 case 't': fputc('\t', fout); break;
 177                 case 'v': fputc('\v', fout); break;
 178                 default: fputc('\\', fout); --i; break;
 179             }
 180
 181       done:
 182         fputs("\n", fout);
 183         fflush(fout);
 184     }
 185 }
 186
 187 void Run(int client, std::string &code, FILE *fout = NULL, bool expand = false) {
 188     Run(client, code.c_str(), code.size(), fout, expand);
 189 }
 190
 191 int (*append_history$)(int, const char *);
 192
 193 static void Console(apr_pool_t *pool, int client, CYOptions &options) {
 194     passwd *passwd;
 195     if (const char *username = getenv("LOGNAME"))
 196         passwd = getpwnam(username);
 197     else
 198         passwd = getpwuid(getuid());
 199
 200     const char *basedir(apr_psprintf(pool, "%s/.cycript", passwd->pw_dir));
 201     const char *histfile(apr_psprintf(pool, "%s/history", basedir));
 202     size_t histlines(0);
 203
 204     mkdir(basedir, 0700);
 205     read_history(histfile);
 206
 207     bool bypass(false);
 208     bool debug(false);
 209     bool expand(false);
 210
 211     FILE *fout(stdout);
 212
 213     rl_bind_key('\t', rl_insert);
 214
 215     struct sigaction action;
 216     sigemptyset(&action.sa_mask);
 217     action.sa_handler = &sigint;
 218     action.sa_flags = 0;
 219     sigaction(SIGINT, &action, NULL);
 220
 221     restart: for (;;) {
 222         std::string command;
 223         std::vector<std::string> lines;
 224
 225         bool extra(false);
 226         const char *prompt("cy# ");
 227
 228         if (setjmp(ctrlc_) != 0) {
 229             mode_ = Working;
 230             fputs("\n", fout);
 231             fflush(fout);
 232             goto restart;
 233         }
 234
 235       read:
 236         mode_ = Parsing;
 237         char *line(readline(prompt));
 238         mode_ = Working;
 239         if (line == NULL)
 240             break;
 241         if (line[0] == '\0')
 242             goto read;
 243
 244         if (!extra) {
 245             extra = true;
 246             if (line[0] == '?') {
 247                 std::string data(line + 1);
 248                 if (data == "bypass") {
 249                     bypass = !bypass;
 250                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 251                     fflush(fout);
 252                 } else if (data == "debug") {
 253                     debug = !debug;
 254                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 255                     fflush(fout);
 256                 } else if (data == "expand") {
 257                     expand = !expand;
 258                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 259                     fflush(fout);
 260                 }
 261                 add_history(line);
 262                 ++histlines;
 263                 goto restart;
 264             }
 265         }
 266
 267         command += line;
 268
 269         char *begin(line), *end(line + strlen(line));
 270         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 271             *nl = '\0';
 272             lines.push_back(begin);
 273             begin = nl + 1;
 274         }
 275
 276         lines.push_back(begin);
 277
 278         free(line);
 279
 280         std::string code;
 281
 282         if (bypass)
 283             code = command;
 284         else {
 285             CYDriver driver("");
 286             cy::parser parser(driver);
 287             Setup(driver, parser);
 288
 289             driver.data_ = command.c_str();
 290             driver.size_ = command.size();
 291
 292             if (parser.parse() != 0 || !driver.errors_.empty()) {
 293                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 294                     cy::position begin(error->location_.begin);
 295                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 296                         cy::position end(error->location_.end);
 297
 298                         if (begin.line != lines.size()) {
 299                             std::cerr << "  | ";
 300                             std::cerr << lines[begin.line - 1] << std::endl;
 301                         }
 302
 303                         std::cerr << "....";
 304                         for (size_t i(0); i != begin.column - 1; ++i)
 305                             std::cerr << '.';
 306                         if (begin.line != end.line || begin.column == end.column)
 307                             std::cerr << '^';
 308                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 309                             std::cerr << '^';
 310                         std::cerr << std::endl;
 311
 312                         std::cerr << "  | ";
 313                         std::cerr << error->message_ << std::endl;
 314
 315                         add_history(command.c_str());
 316                         ++histlines;
 317                         goto restart;
 318                     }
 319                 }
 320
 321                 driver.errors_.clear();
 322
 323                 command += '\n';
 324                 prompt = "cy> ";
 325                 goto read;
 326             }
 327
 328             if (driver.program_ == NULL)
 329                 goto restart;
 330
 331             if (client != -1)
 332                 code = command;
 333             else {
 334                 std::ostringstream str;
 335                 CYOutput out(str, options);
 336                 Setup(out, driver, options);
 337                 out << *driver.program_;
 338                 code = str.str();
 339             }
 340         }
 341
 342         add_history(command.c_str());
 343         ++histlines;
 344
 345         if (debug)
 346             std::cout << code << std::endl;
 347
 348         Run(client, code, fout, expand);
 349     }
 350
 351     if (append_history$ != NULL) {
 352         _syscall(close(_syscall(open(histfile, O_CREAT | O_WRONLY, 0600))));
 353         (*append_history$)(histlines, histfile);
 354     } else {
 355         write_history(histfile);
 356     }
 357
 358     fputs("\n", fout);
 359     fflush(fout);
 360 }
 361
 362 static void *Map(const char *path, size_t *psize) {
 363     int fd;
 364     _syscall(fd = open(path, O_RDONLY));
 365
 366     struct stat stat;
 367     _syscall(fstat(fd, &stat));
 368     size_t size(stat.st_size);
 369
 370     *psize = size;
 371
 372     void *base;
 373     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 374
 375     _syscall(close(fd));
 376     return base;
 377 }
 378
 379 void InjectLibrary(pid_t pid);
 380
 381 int Main(int argc, char const * const argv[], char const * const envp[]) {
 382     bool tty(isatty(STDIN_FILENO));
 383     bool compile(false);
 384     CYOptions options;
 385
 386     append_history$ = reinterpret_cast<int (*)(int, const char *)>(dlsym(RTLD_DEFAULT, "append_history"));
 387
 388 #ifdef CY_ATTACH
 389     pid_t pid(_not(pid_t));
 390 #endif
 391
 392     CYPool pool;
 393     apr_getopt_t *state;
 394     _aprcall(apr_getopt_init(&state, pool, argc, argv));
 395
 396     for (;;) {
 397         char opt;
 398         const char *arg;
 399
 400         apr_status_t status(apr_getopt(state,
 401             "cg:n:"
 402 #ifdef CY_ATTACH
 403             "p:"
 404 #endif
 405             "s"
 406         , &opt, &arg));
 407
 408         switch (status) {
 409             case APR_EOF:
 410                 goto getopt;
 411             case APR_BADCH:
 412             case APR_BADARG:
 413                 fprintf(stderr,
 414                     "usage: cycript [-c]"
 415 #ifdef CY_ATTACH
 416                     " [-p <pid|name>]"
 417 #endif
 418                     " [<script> [<arg>...]]\n"
 419                 );
 420                 return 1;
 421             default:
 422                 _aprcall(status);
 423         }
 424
 425         switch (opt) {
 426             case 'c':
 427                 compile = true;
 428             break;
 429
 430             case 'g':
 431                 if (false);
 432                 else if (strcmp(arg, "rename") == 0)
 433                     options.verbose_ = true;
 434 #if YYDEBUG
 435                 else if (strcmp(arg, "bison") == 0)
 436                     bison_ = true;
 437 #endif
 438                 else {
 439                     fprintf(stderr, "invalid name for -g\n");
 440                     return 1;
 441                 }
 442             break;
 443
 444             case 'n':
 445                 if (false);
 446                 else if (strcmp(arg, "minify") == 0)
 447                     pretty_ = true;
 448                 else {
 449                     fprintf(stderr, "invalid name for -n\n");
 450                     return 1;
 451                 }
 452             break;
 453
 454 #ifdef CY_ATTACH
 455             case 'p': {
 456                 size_t size(strlen(arg));
 457                 char *end;
 458
 459                 pid = strtoul(arg, &end, 0);
 460                 if (arg + size != end) {
 461                     // XXX: arg needs to be escaped in some horrendous way of doom
 462                     const char *command(apr_psprintf(pool, "ps axc|sed -e '/^ *[0-9]/{s/^ *\\([0-9]*\\)\\( *[^ ]*\\)\\{3\\} *-*\\([^ ]*\\)/\\3 \\1/;/^%s /{s/^[^ ]* //;q;};};d'", arg));
 463
 464                     if (FILE *pids = popen(command, "r")) {
 465                         char value[32];
 466                         size = 0;
 467
 468                         for (;;) {
 469                             size_t read(fread(value + size, 1, sizeof(value) - size, pids));
 470                             if (read == 0)
 471                                 break;
 472                             else {
 473                                 size += read;
 474                                 if (size == sizeof(value)) {
 475                                     pid = _not(pid_t);
 476                                     goto fail;
 477                                 }
 478                             }
 479                         }
 480
 481                       size:
 482                         if (size == 0)
 483                             goto fail;
 484                         if (value[size - 1] == '\n') {
 485                             --size;
 486                             goto size;
 487                         }
 488
 489                         value[size] = '\0';
 490                         size = strlen(value);
 491                         pid = strtoul(value, &end, 0);
 492                         if (value + size != end) fail:
 493                             pid = _not(pid_t);
 494                         _syscall(pclose(pids));
 495                     }
 496
 497                     if (pid == _not(pid_t)) {
 498                         fprintf(stderr, "invalid pid for -p\n");
 499                         return 1;
 500                     }
 501                 }
 502             } break;
 503 #endif
 504
 505             case 's':
 506                 strict_ = true;
 507             break;
 508         }
 509     } getopt:;
 510
 511     const char *script;
 512     int ind(state->ind);
 513
 514 #ifdef CY_ATTACH
 515     if (pid != _not(pid_t) && ind < argc - 1) {
 516         fprintf(stderr, "-p cannot set argv\n");
 517         return 1;
 518     }
 519
 520     if (pid != _not(pid_t) && compile) {
 521         fprintf(stderr, "-p conflicts with -c\n");
 522         return 1;
 523     }
 524 #endif
 525
 526     if (ind == argc)
 527         script = NULL;
 528     else {
 529 #ifdef CY_EXECUTE
 530         // XXX: const_cast?! wtf gcc :(
 531         CYSetArgs(argc - ind - 1, const_cast<const char **>(argv + ind + 1));
 532 #endif
 533         script = argv[ind];
 534         if (strcmp(script, "-") == 0)
 535             script = NULL;
 536     }
 537
 538 #ifdef CY_ATTACH
 539     if (pid != _not(pid_t) && script == NULL && !tty) {
 540         fprintf(stderr, "non-terminal attaching to remote console\n");
 541         return 1;
 542     }
 543 #endif
 544
 545     int client;
 546
 547 #ifdef CY_ATTACH
 548     if (pid == _not(pid_t))
 549         client = -1;
 550     else {
 551         int server(_syscall(socket(PF_UNIX, SOCK_STREAM, 0))); try {
 552             struct sockaddr_un address;
 553             memset(&address, 0, sizeof(address));
 554             address.sun_family = AF_UNIX;
 555
 556             sprintf(address.sun_path, "/tmp/.s.cy.%u", getpid());
 557
 558             _syscall(bind(server, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 559             _syscall(chmod(address.sun_path, 0777));
 560
 561             try {
 562                 _syscall(listen(server, 1));
 563                 InjectLibrary(pid);
 564                 client = _syscall(accept(server, NULL, NULL));
 565             } catch (...) {
 566                 // XXX: exception?
 567                 unlink(address.sun_path);
 568                 throw;
 569             }
 570         } catch (...) {
 571             _syscall(close(server));
 572             throw;
 573         }
 574     }
 575 #else
 576     client = -1;
 577 #endif
 578
 579     if (script == NULL && tty)
 580         Console(pool, client, options);
 581     else {
 582         CYDriver driver(script ?: "<stdin>");
 583         cy::parser parser(driver);
 584         Setup(driver, parser);
 585
 586         char *start, *end;
 587
 588         if (script == NULL) {
 589             start = NULL;
 590             end = NULL;
 591
 592             driver.file_ = stdin;
 593         } else {
 594             size_t size;
 595             start = reinterpret_cast<char *>(Map(script, &size));
 596             end = start + size;
 597
 598             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 599                 start += 2;
 600
 601                 if (void *line = memchr(start, '\n', end - start))
 602                     start = reinterpret_cast<char *>(line);
 603                 else
 604                     start = end;
 605             }
 606
 607             driver.data_ = start;
 608             driver.size_ = end - start;
 609         }
 610
 611         if (parser.parse() != 0 || !driver.errors_.empty()) {
 612             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 613                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 614         } else if (driver.program_ != NULL)
 615             if (client != -1) {
 616                 std::string code(start, end-start);
 617                 Run(client, code, stdout);
 618             } else {
 619                 std::ostringstream str;
 620                 CYOutput out(str, options);
 621                 Setup(out, driver, options);
 622                 out << *driver.program_;
 623                 std::string code(str.str());
 624                 if (compile)
 625                     std::cout << code;
 626                 else
 627                     Run(client, code, stdout);
 628             }
 629     }
 630
 631     return 0;
 632 }
 633
 634 int main(int argc, char const * const argv[], char const * const envp[]) {
 635     apr_status_t status(apr_app_initialize(&argc, &argv, &envp));
 636
 637     if (status != APR_SUCCESS) {
 638         fprintf(stderr, "apr_app_initialize() != APR_SUCCESS\n");
 639         return 1;
 640     } else try {
 641         return Main(argc, argv, envp);
 642     } catch (const CYException &error) {
 643         CYPool pool;
 644         fprintf(stderr, "%s\n", error.PoolCString(pool));
 645         return 1;
 646     }
 647 }