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