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     CYOptions options;
 119     CYContext context(driver.pool_, options);
 120     driver.program_->Replace(context);
 121 }
 122
 123 void Run(int client, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 124     CYPool pool;
 125
 126     const char *json;
 127     if (client == -1) {
 128         mode_ = Running;
 129 #ifdef CY_EXECUTE
 130         json = CYExecute(pool, data);
 131 #else
 132         json = NULL;
 133 #endif
 134         mode_ = Working;
 135         if (json != NULL)
 136             size = strlen(json);
 137     } else {
 138         mode_ = Sending;
 139         CYSendAll(client, &size, sizeof(size));
 140         CYSendAll(client, data, size);
 141         mode_ = Waiting;
 142         CYRecvAll(client, &size, sizeof(size));
 143         if (size == _not(size_t))
 144             json = NULL;
 145         else {
 146             char *temp(new(pool) char[size + 1]);
 147             CYRecvAll(client, temp, size);
 148             temp[size] = '\0';
 149             json = temp;
 150         }
 151         mode_ = Working;
 152     }
 153
 154     if (json != NULL && fout != NULL) {
 155         if (!expand || json[0] != '"' && json[0] != '\'')
 156             fputs(json, fout);
 157         else for (size_t i(0); i != size; ++i)
 158             if (json[i] != '\\')
 159                 fputc(json[i], fout);
 160             else switch(json[++i]) {
 161                 case '\0': goto done;
 162                 case '\\': fputc('\\', fout); break;
 163                 case '\'': fputc('\'', fout); break;
 164                 case '"': fputc('"', fout); break;
 165                 case 'b': fputc('\b', fout); break;
 166                 case 'f': fputc('\f', fout); break;
 167                 case 'n': fputc('\n', fout); break;
 168                 case 'r': fputc('\r', fout); break;
 169                 case 't': fputc('\t', fout); break;
 170                 case 'v': fputc('\v', fout); break;
 171                 default: fputc('\\', fout); --i; break;
 172             }
 173
 174       done:
 175         fputs("\n", fout);
 176         fflush(fout);
 177     }
 178 }
 179
 180 void Run(int client, std::string &code, FILE *fout = NULL, bool expand = false) {
 181     Run(client, code.c_str(), code.size(), fout, expand);
 182 }
 183
 184 int (*append_history$)(int, const char *);
 185
 186 static void Console(apr_pool_t *pool, int client) {
 187     passwd *passwd;
 188     if (const char *username = getenv("LOGNAME"))
 189         passwd = getpwnam(username);
 190     else
 191         passwd = getpwuid(getuid());
 192
 193     const char *basedir(apr_psprintf(pool, "%s/.cycript", passwd->pw_dir));
 194     const char *histfile(apr_psprintf(pool, "%s/history", basedir));
 195     size_t histlines(0);
 196
 197     mkdir(basedir, 0700);
 198     read_history(histfile);
 199
 200     bool bypass(false);
 201     bool debug(false);
 202     bool expand(false);
 203
 204     FILE *fout(stdout);
 205
 206     rl_bind_key('\t', rl_insert);
 207
 208     struct sigaction action;
 209     sigemptyset(&action.sa_mask);
 210     action.sa_handler = &sigint;
 211     action.sa_flags = 0;
 212     sigaction(SIGINT, &action, NULL);
 213
 214     restart: for (;;) {
 215         std::string command;
 216         std::vector<std::string> lines;
 217
 218         bool extra(false);
 219         const char *prompt("cy# ");
 220
 221         if (setjmp(ctrlc_) != 0) {
 222             mode_ = Working;
 223             fputs("\n", fout);
 224             fflush(fout);
 225             goto restart;
 226         }
 227
 228       read:
 229         mode_ = Parsing;
 230         char *line(readline(prompt));
 231         mode_ = Working;
 232         if (line == NULL)
 233             break;
 234         if (line[0] == '\0')
 235             goto read;
 236
 237         if (!extra) {
 238             extra = true;
 239             if (line[0] == '?') {
 240                 std::string data(line + 1);
 241                 if (data == "bypass") {
 242                     bypass = !bypass;
 243                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 244                     fflush(fout);
 245                 } else if (data == "debug") {
 246                     debug = !debug;
 247                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 248                     fflush(fout);
 249                 } else if (data == "expand") {
 250                     expand = !expand;
 251                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 252                     fflush(fout);
 253                 }
 254                 add_history(line);
 255                 ++histlines;
 256                 goto restart;
 257             }
 258         }
 259
 260         command += line;
 261
 262         char *begin(line), *end(line + strlen(line));
 263         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 264             *nl = '\0';
 265             lines.push_back(begin);
 266             begin = nl + 1;
 267         }
 268
 269         lines.push_back(begin);
 270
 271         free(line);
 272
 273         std::string code;
 274
 275         if (bypass)
 276             code = command;
 277         else {
 278             CYDriver driver("");
 279             cy::parser parser(driver);
 280             Setup(driver, parser);
 281
 282             driver.data_ = command.c_str();
 283             driver.size_ = command.size();
 284
 285             if (parser.parse() != 0 || !driver.errors_.empty()) {
 286                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 287                     cy::position begin(error->location_.begin);
 288                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 289                         cy::position end(error->location_.end);
 290
 291                         if (begin.line != lines.size()) {
 292                             std::cerr << "  | ";
 293                             std::cerr << lines[begin.line - 1] << std::endl;
 294                         }
 295
 296                         std::cerr << "....";
 297                         for (size_t i(0); i != begin.column - 1; ++i)
 298                             std::cerr << '.';
 299                         if (begin.line != end.line || begin.column == end.column)
 300                             std::cerr << '^';
 301                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 302                             std::cerr << '^';
 303                         std::cerr << std::endl;
 304
 305                         std::cerr << "  | ";
 306                         std::cerr << error->message_ << std::endl;
 307
 308                         add_history(command.c_str());
 309                         ++histlines;
 310                         goto restart;
 311                     }
 312                 }
 313
 314                 driver.errors_.clear();
 315
 316                 command += '\n';
 317                 prompt = "cy> ";
 318                 goto read;
 319             }
 320
 321             if (driver.program_ == NULL)
 322                 goto restart;
 323
 324             if (client != -1)
 325                 code = command;
 326             else {
 327                 std::ostringstream str;
 328                 CYOptions options;
 329                 CYOutput out(str, options);
 330                 Setup(out, driver);
 331                 out << *driver.program_;
 332                 code = str.str();
 333             }
 334         }
 335
 336         add_history(command.c_str());
 337         ++histlines;
 338
 339         if (debug)
 340             std::cout << code << std::endl;
 341
 342         Run(client, code, fout, expand);
 343     }
 344
 345     if (append_history$ != NULL) {
 346         _syscall(close(_syscall(open(histfile, O_CREAT | O_WRONLY, 0600))));
 347         (*append_history$)(histlines, histfile);
 348     } else {
 349         write_history(histfile);
 350     }
 351
 352     fputs("\n", fout);
 353     fflush(fout);
 354 }
 355
 356 static void *Map(const char *path, size_t *psize) {
 357     int fd;
 358     _syscall(fd = open(path, O_RDONLY));
 359
 360     struct stat stat;
 361     _syscall(fstat(fd, &stat));
 362     size_t size(stat.st_size);
 363
 364     *psize = size;
 365
 366     void *base;
 367     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 368
 369     _syscall(close(fd));
 370     return base;
 371 }
 372
 373 void InjectLibrary(pid_t pid);
 374
 375 int Main(int argc, char const * const argv[], char const * const envp[]) {
 376     bool tty(isatty(STDIN_FILENO));
 377     bool compile(false);
 378
 379     append_history$ = reinterpret_cast<int (*)(int, const char *)>(dlsym(RTLD_DEFAULT, "append_history"));
 380
 381 #ifdef CY_ATTACH
 382     pid_t pid(_not(pid_t));
 383 #endif
 384
 385     CYPool pool;
 386     apr_getopt_t *state;
 387     _aprcall(apr_getopt_init(&state, pool, argc, argv));
 388
 389     for (;;) {
 390         char opt;
 391         const char *arg;
 392
 393         apr_status_t status(apr_getopt(state,
 394             "cg:n:"
 395 #ifdef CY_ATTACH
 396             "p:"
 397 #endif
 398             "s"
 399         , &opt, &arg));
 400
 401         switch (status) {
 402             case APR_EOF:
 403                 goto getopt;
 404             case APR_BADCH:
 405             case APR_BADARG:
 406                 fprintf(stderr,
 407                     "usage: cycript [-c]"
 408 #ifdef CY_ATTACH
 409                     " [-p <pid|name>]"
 410 #endif
 411                     " [<script> [<arg>...]]\n"
 412                 );
 413                 return 1;
 414             default:
 415                 _aprcall(status);
 416         }
 417
 418         switch (opt) {
 419             case 'c':
 420                 compile = true;
 421             break;
 422
 423             case 'g':
 424                 if (false);
 425 #if YYDEBUG
 426                 else if (strcmp(arg, "bison") == 0)
 427                     bison_ = true;
 428 #endif
 429                 else {
 430                     fprintf(stderr, "invalid name for -g\n");
 431                     return 1;
 432                 }
 433             break;
 434
 435             case 'n':
 436                 if (false);
 437                 else if (strcmp(arg, "minify") == 0)
 438                     pretty_ = true;
 439                 else {
 440                     fprintf(stderr, "invalid name for -n\n");
 441                     return 1;
 442                 }
 443             break;
 444
 445 #ifdef CY_ATTACH
 446             case 'p': {
 447                 size_t size(strlen(arg));
 448                 char *end;
 449
 450                 pid = strtoul(arg, &end, 0);
 451                 if (arg + size != end) {
 452                     // XXX: arg needs to be escaped in some horrendous way of doom
 453                     const char *command(apr_psprintf(pool, "ps axc|sed -e '/^ *[0-9]/{s/^ *\\([0-9]*\\)\\( *[^ ]*\\)\\{3\\} *-*\\([^ ]*\\)/\\3 \\1/;/^%s /{s/^[^ ]* //;q;};};d'", arg));
 454
 455                     if (FILE *pids = popen(command, "r")) {
 456                         char value[32];
 457                         size = 0;
 458
 459                         for (;;) {
 460                             size_t read(fread(value + size, 1, sizeof(value) - size, pids));
 461                             if (read == 0)
 462                                 break;
 463                             else {
 464                                 size += read;
 465                                 if (size == sizeof(value)) {
 466                                     pid = _not(pid_t);
 467                                     goto fail;
 468                                 }
 469                             }
 470                         }
 471
 472                       size:
 473                         if (size == 0)
 474                             goto fail;
 475                         if (value[size - 1] == '\n') {
 476                             --size;
 477                             goto size;
 478                         }
 479
 480                         value[size] = '\0';
 481                         size = strlen(value);
 482                         pid = strtoul(value, &end, 0);
 483                         if (value + size != end) fail:
 484                             pid = _not(pid_t);
 485                         _syscall(pclose(pids));
 486                     }
 487
 488                     if (pid == _not(pid_t)) {
 489                         fprintf(stderr, "invalid pid for -p\n");
 490                         return 1;
 491                     }
 492                 }
 493             } break;
 494 #endif
 495
 496             case 's':
 497                 strict_ = true;
 498             break;
 499         }
 500     } getopt:;
 501
 502     const char *script;
 503     int ind(state->ind);
 504
 505 #ifdef CY_ATTACH
 506     if (pid != _not(pid_t) && ind < argc - 1) {
 507         fprintf(stderr, "-p cannot set argv\n");
 508         return 1;
 509     }
 510
 511     if (pid != _not(pid_t) && compile) {
 512         fprintf(stderr, "-p conflicts with -c\n");
 513         return 1;
 514     }
 515 #endif
 516
 517     if (ind == argc)
 518         script = NULL;
 519     else {
 520 #ifdef CY_EXECUTE
 521         // XXX: const_cast?! wtf gcc :(
 522         CYSetArgs(argc - ind - 1, const_cast<const char **>(argv + ind + 1));
 523 #endif
 524         script = argv[ind];
 525         if (strcmp(script, "-") == 0)
 526             script = NULL;
 527     }
 528
 529 #ifdef CY_ATTACH
 530     if (pid != _not(pid_t) && script == NULL && !tty) {
 531         fprintf(stderr, "non-terminal attaching to remote console\n");
 532         return 1;
 533     }
 534 #endif
 535
 536     int client;
 537
 538 #ifdef CY_ATTACH
 539     if (pid == _not(pid_t))
 540         client = -1;
 541     else {
 542         int server(_syscall(socket(PF_UNIX, SOCK_STREAM, 0))); try {
 543             struct sockaddr_un address;
 544             memset(&address, 0, sizeof(address));
 545             address.sun_family = AF_UNIX;
 546
 547             sprintf(address.sun_path, "/tmp/.s.cy.%u", getpid());
 548
 549             _syscall(bind(server, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 550             _syscall(chmod(address.sun_path, 0777));
 551
 552             try {
 553                 _syscall(listen(server, 1));
 554                 InjectLibrary(pid);
 555                 client = _syscall(accept(server, NULL, NULL));
 556             } catch (...) {
 557                 // XXX: exception?
 558                 unlink(address.sun_path);
 559                 throw;
 560             }
 561         } catch (...) {
 562             _syscall(close(server));
 563             throw;
 564         }
 565     }
 566 #else
 567     client = -1;
 568 #endif
 569
 570     if (script == NULL && tty)
 571         Console(pool, client);
 572     else {
 573         CYDriver driver(script ?: "<stdin>");
 574         cy::parser parser(driver);
 575         Setup(driver, parser);
 576
 577         char *start, *end;
 578
 579         if (script == NULL) {
 580             start = NULL;
 581             end = NULL;
 582
 583             driver.file_ = stdin;
 584         } else {
 585             size_t size;
 586             start = reinterpret_cast<char *>(Map(script, &size));
 587             end = start + size;
 588
 589             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 590                 start += 2;
 591
 592                 if (void *line = memchr(start, '\n', end - start))
 593                     start = reinterpret_cast<char *>(line);
 594                 else
 595                     start = end;
 596             }
 597
 598             driver.data_ = start;
 599             driver.size_ = end - start;
 600         }
 601
 602         if (parser.parse() != 0 || !driver.errors_.empty()) {
 603             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 604                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 605         } else if (driver.program_ != NULL)
 606             if (client != -1) {
 607                 std::string code(start, end-start);
 608                 Run(client, code, stdout);
 609             } else {
 610                 std::ostringstream str;
 611                 CYOptions options;
 612                 CYOutput out(str, options);
 613                 Setup(out, driver);
 614                 out << *driver.program_;
 615                 std::string code(str.str());
 616                 if (compile)
 617                     std::cout << code;
 618                 else
 619                     Run(client, code, stdout);
 620             }
 621     }
 622
 623     return 0;
 624 }
 625
 626 int main(int argc, char const * const argv[], char const * const envp[]) {
 627     apr_status_t status(apr_app_initialize(&argc, &argv, &envp));
 628
 629     if (status != APR_SUCCESS) {
 630         fprintf(stderr, "apr_app_initialize() != APR_SUCCESS\n");
 631         return 1;
 632     } else try {
 633         return Main(argc, argv, envp);
 634     } catch (const CYException &error) {
 635         CYPool pool;
 636         fprintf(stderr, "%s\n", error.PoolCString(pool));
 637         return 1;
 638     }
 639 }