Console.cpp

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