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