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