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 #define _GNU_SOURCE
  41
  42 #include <substrate.h>
  43 #include "cycript.hpp"
  44
  45 #include <cstdio>
  46 #include <sstream>
  47
  48 #include <setjmp.h>
  49
  50 #include <readline/readline.h>
  51 #include <readline/history.h>
  52
  53 #include <sys/mman.h>
  54
  55 #include <errno.h>
  56 #include <unistd.h>
  57
  58 #include <sys/types.h>
  59 #include <sys/stat.h>
  60 #include <fcntl.h>
  61
  62 #include "Cycript.tab.hh"
  63
  64 #include <sys/types.h>
  65 #include <sys/socket.h>
  66 #include <netinet/in.h>
  67 #include <sys/un.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) {
 110     out.pretty_ = pretty_;
 111 }
 112
 113 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 114     CYPool pool;
 115
 116     const char *json;
 117     if (socket == -1) {
 118         mode_ = Running;
 119         json = CYExecute(pool, data);
 120         mode_ = Working;
 121         if (json != NULL)
 122             size = strlen(json);
 123     } else {
 124         mode_ = Sending;
 125         CYSendAll(socket, &size, sizeof(size));
 126         CYSendAll(socket, data, size);
 127         mode_ = Waiting;
 128         CYRecvAll(socket, &size, sizeof(size));
 129         if (size == _not(size_t))
 130             json = NULL;
 131         else {
 132             char *temp(new(pool) char[size + 1]);
 133             CYRecvAll(socket, temp, size);
 134             temp[size] = '\0';
 135             json = temp;
 136         }
 137         mode_ = Working;
 138     }
 139
 140     if (json != NULL && fout != NULL) {
 141         if (!expand || json[0] != '"' && json[0] != '\'')
 142             fputs(json, fout);
 143         else for (size_t i(0); i != size; ++i)
 144             if (json[i] != '\\')
 145                 fputc(json[i], fout);
 146             else switch(json[++i]) {
 147                 case '\0': goto done;
 148                 case '\\': fputc('\\', fout); break;
 149                 case '\'': fputc('\'', fout); break;
 150                 case '"': fputc('"', fout); break;
 151                 case 'b': fputc('\b', fout); break;
 152                 case 'f': fputc('\f', fout); break;
 153                 case 'n': fputc('\n', fout); break;
 154                 case 'r': fputc('\r', fout); break;
 155                 case 't': fputc('\t', fout); break;
 156                 case 'v': fputc('\v', fout); break;
 157                 default: fputc('\\', fout); --i; break;
 158             }
 159
 160       done:
 161         fputs("\n", fout);
 162         fflush(fout);
 163     }
 164 }
 165
 166 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 167     Run(socket, code.c_str(), code.size(), fout, expand);
 168 }
 169
 170 static void Console(int socket) {
 171     bool bypass(false);
 172     bool debug(false);
 173     bool expand(false);
 174
 175     FILE *fout(stdout);
 176
 177     rl_bind_key('\t', rl_insert);
 178
 179     struct sigaction action;
 180     sigemptyset(&action.sa_mask);
 181     action.sa_handler = &sigint;
 182     action.sa_flags = 0;
 183     sigaction(SIGINT, &action, NULL);
 184
 185     restart: for (;;) {
 186         std::string command;
 187         std::vector<std::string> lines;
 188
 189         bool extra(false);
 190         const char *prompt("cy# ");
 191
 192         if (setjmp(ctrlc_) != 0) {
 193             mode_ = Working;
 194             fputs("\n", fout);
 195             fflush(fout);
 196             goto restart;
 197         }
 198
 199       read:
 200         mode_ = Parsing;
 201         char *line(readline(prompt));
 202         mode_ = Working;
 203         if (line == NULL)
 204             break;
 205
 206         if (!extra) {
 207             extra = true;
 208             if (line[0] == '?') {
 209                 std::string data(line + 1);
 210                 if (data == "bypass") {
 211                     bypass = !bypass;
 212                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 213                     fflush(fout);
 214                 } else if (data == "debug") {
 215                     debug = !debug;
 216                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 217                     fflush(fout);
 218                 } else if (data == "expand") {
 219                     expand = !expand;
 220                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 221                     fflush(fout);
 222                 }
 223                 add_history(line);
 224                 goto restart;
 225             }
 226         }
 227
 228         command += line;
 229
 230         char *begin(line), *end(line + strlen(line));
 231         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 232             *nl = '\0';
 233             lines.push_back(begin);
 234             begin = nl + 1;
 235         }
 236
 237         lines.push_back(begin);
 238
 239         free(line);
 240
 241         std::string code;
 242
 243         if (bypass)
 244             code = command;
 245         else {
 246             CYDriver driver("");
 247             cy::parser parser(driver);
 248             Setup(driver, parser);
 249
 250             driver.data_ = command.c_str();
 251             driver.size_ = command.size();
 252
 253             if (parser.parse() != 0 || !driver.errors_.empty()) {
 254                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 255                     cy::position begin(error->location_.begin);
 256                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 257                         cy::position end(error->location_.end);
 258
 259                         if (begin.line != lines.size()) {
 260                             std::cerr << "  | ";
 261                             std::cerr << lines[begin.line - 1] << std::endl;
 262                         }
 263
 264                         std::cerr << "  | ";
 265                         for (size_t i(0); i != begin.column - 1; ++i)
 266                             std::cerr << '.';
 267                         if (begin.line != end.line || begin.column == end.column)
 268                             std::cerr << '^';
 269                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 270                             std::cerr << '^';
 271                         std::cerr << std::endl;
 272
 273                         std::cerr << "  | ";
 274                         std::cerr << error->message_ << std::endl;
 275
 276                         add_history(command.c_str());
 277                         goto restart;
 278                     }
 279                 }
 280
 281                 driver.errors_.clear();
 282
 283                 command += '\n';
 284                 prompt = "cy> ";
 285                 goto read;
 286             }
 287
 288             if (driver.program_ == NULL)
 289                 goto restart;
 290
 291             if (socket != -1)
 292                 code = command;
 293             else {
 294                 std::ostringstream str;
 295                 CYOutput out(str);
 296                 Setup(out);
 297                 driver.program_->Multiple(out);
 298                 code = str.str();
 299             }
 300         }
 301
 302         add_history(command.c_str());
 303
 304         if (debug)
 305             std::cout << code << std::endl;
 306
 307         Run(socket, code, fout, expand);
 308     }
 309
 310     fputs("\n", fout);
 311     fflush(fout);
 312 }
 313
 314 static void *Map(const char *path, size_t *psize) {
 315     int fd;
 316     _syscall(fd = open(path, O_RDONLY));
 317
 318     struct stat stat;
 319     _syscall(fstat(fd, &stat));
 320     size_t size(stat.st_size);
 321
 322     *psize = size;
 323
 324     void *base;
 325     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 326
 327     _syscall(close(fd));
 328     return base;
 329 }
 330
 331 int main(int argc, char *argv[]) {
 332     bool tty(isatty(STDIN_FILENO));
 333     pid_t pid(_not(pid_t));
 334     bool compile(false);
 335
 336     for (;;) switch (getopt(argc, argv, "cg:n:p:s")) {
 337         case -1:
 338             goto getopt;
 339         case '?':
 340             fprintf(stderr, "usage: cycript [-c] [-p <pid>] [<script> [<arg>...]]\n");
 341             return 1;
 342
 343         case 'c':
 344             compile = true;
 345         break;
 346
 347         case 'g':
 348             if (false);
 349 #if YYDEBUG
 350             else if (strcmp(optarg, "bison") == 0)
 351                 bison_ = true;
 352 #endif
 353             else {
 354                 fprintf(stderr, "invalid name for -g\n");
 355                 return 1;
 356             }
 357         break;
 358
 359         case 'n':
 360             if (false);
 361             else if (strcmp(optarg, "minify") == 0)
 362                 pretty_ = true;
 363             else {
 364                 fprintf(stderr, "invalid name for -n\n");
 365                 return 1;
 366             }
 367         break;
 368
 369         case 'p': {
 370             size_t size(strlen(optarg));
 371             char *end;
 372             pid = strtoul(optarg, &end, 0);
 373             if (optarg + size != end) {
 374                 fprintf(stderr, "invalid pid for -p\n");
 375                 return 1;
 376             }
 377         } break;
 378
 379         case 's':
 380             strict_ = true;
 381         break;
 382     } getopt:;
 383
 384     const char *script;
 385
 386     if (pid != _not(pid_t) && optind < argc - 1) {
 387         fprintf(stderr, "-p cannot set argv\n");
 388         return 1;
 389     }
 390
 391     if (pid != _not(pid_t) && compile) {
 392         fprintf(stderr, "-p conflicts with -c\n");
 393         return 1;
 394     }
 395
 396     if (optind == argc)
 397         script = NULL;
 398     else {
 399         // XXX: const_cast?! wtf gcc :(
 400         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 401         script = argv[optind];
 402         if (strcmp(script, "-") == 0)
 403             script = NULL;
 404     }
 405
 406     if (script == NULL && !tty && pid != _not(pid_t)) {
 407         fprintf(stderr, "non-terminal attaching to remove console\n");
 408         return 1;
 409     }
 410
 411     int socket;
 412
 413     if (pid == _not(pid_t))
 414         socket = -1;
 415     else {
 416         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 417
 418         struct sockaddr_un address;
 419         memset(&address, 0, sizeof(address));
 420         address.sun_family = AF_UNIX;
 421         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 422
 423         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 424     }
 425
 426     if (script == NULL && tty)
 427         Console(socket);
 428     else {
 429         CYDriver driver(script ?: "<stdin>");
 430         cy::parser parser(driver);
 431         Setup(driver, parser);
 432
 433         char *start, *end;
 434
 435         if (script == NULL) {
 436             start = NULL;
 437             end = NULL;
 438
 439             driver.file_ = stdin;
 440         } else {
 441             size_t size;
 442             start = reinterpret_cast<char *>(Map(script, &size));
 443             end = start + size;
 444
 445             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 446                 start += 2;
 447
 448                 if (void *line = memchr(start, '\n', end - start))
 449                     start = reinterpret_cast<char *>(line);
 450                 else
 451                     start = end;
 452             }
 453
 454             driver.data_ = start;
 455             driver.size_ = end - start;
 456         }
 457
 458         if (parser.parse() != 0 || !driver.errors_.empty()) {
 459             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 460                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 461         } else if (driver.program_ != NULL)
 462             if (socket != -1)
 463                 Run(socket, start, end - start, stdout);
 464             else {
 465                 std::ostringstream str;
 466                 CYOutput out(str);
 467                 Setup(out);
 468                 driver.program_->Multiple(out);
 469                 std::string code(str.str());
 470                 if (compile)
 471                     std::cout << code;
 472                 else
 473                     Run(socket, code);
 474             }
 475     }
 476
 477     return 0;
 478 }