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, CYDriver &driver) {
 110     out.pretty_ = pretty_;
 111
 112     CYContext context(driver.pool_);
 113     driver.program_->Replace(context);
 114 }
 115
 116 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 117     CYPool pool;
 118
 119     const char *json;
 120     if (socket == -1) {
 121         mode_ = Running;
 122         json = CYExecute(pool, data);
 123         mode_ = Working;
 124         if (json != NULL)
 125             size = strlen(json);
 126     } else {
 127         mode_ = Sending;
 128         CYSendAll(socket, &size, sizeof(size));
 129         CYSendAll(socket, data, size);
 130         mode_ = Waiting;
 131         CYRecvAll(socket, &size, sizeof(size));
 132         if (size == _not(size_t))
 133             json = NULL;
 134         else {
 135             char *temp(new(pool) char[size + 1]);
 136             CYRecvAll(socket, temp, size);
 137             temp[size] = '\0';
 138             json = temp;
 139         }
 140         mode_ = Working;
 141     }
 142
 143     if (json != NULL && fout != NULL) {
 144         if (!expand || json[0] != '"' && json[0] != '\'')
 145             fputs(json, fout);
 146         else for (size_t i(0); i != size; ++i)
 147             if (json[i] != '\\')
 148                 fputc(json[i], fout);
 149             else switch(json[++i]) {
 150                 case '\0': goto done;
 151                 case '\\': fputc('\\', fout); break;
 152                 case '\'': fputc('\'', fout); break;
 153                 case '"': fputc('"', fout); break;
 154                 case 'b': fputc('\b', fout); break;
 155                 case 'f': fputc('\f', fout); break;
 156                 case 'n': fputc('\n', fout); break;
 157                 case 'r': fputc('\r', fout); break;
 158                 case 't': fputc('\t', fout); break;
 159                 case 'v': fputc('\v', fout); break;
 160                 default: fputc('\\', fout); --i; break;
 161             }
 162
 163       done:
 164         fputs("\n", fout);
 165         fflush(fout);
 166     }
 167 }
 168
 169 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 170     Run(socket, code.c_str(), code.size(), fout, expand);
 171 }
 172
 173 static void Console(int socket) {
 174     bool bypass(false);
 175     bool debug(false);
 176     bool expand(false);
 177
 178     FILE *fout(stdout);
 179
 180     rl_bind_key('\t', rl_insert);
 181
 182     struct sigaction action;
 183     sigemptyset(&action.sa_mask);
 184     action.sa_handler = &sigint;
 185     action.sa_flags = 0;
 186     sigaction(SIGINT, &action, NULL);
 187
 188     restart: for (;;) {
 189         std::string command;
 190         std::vector<std::string> lines;
 191
 192         bool extra(false);
 193         const char *prompt("cy# ");
 194
 195         if (setjmp(ctrlc_) != 0) {
 196             mode_ = Working;
 197             fputs("\n", fout);
 198             fflush(fout);
 199             goto restart;
 200         }
 201
 202       read:
 203         mode_ = Parsing;
 204         char *line(readline(prompt));
 205         mode_ = Working;
 206         if (line == NULL)
 207             break;
 208
 209         if (!extra) {
 210             extra = true;
 211             if (line[0] == '?') {
 212                 std::string data(line + 1);
 213                 if (data == "bypass") {
 214                     bypass = !bypass;
 215                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 216                     fflush(fout);
 217                 } else if (data == "debug") {
 218                     debug = !debug;
 219                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 220                     fflush(fout);
 221                 } else if (data == "expand") {
 222                     expand = !expand;
 223                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 224                     fflush(fout);
 225                 }
 226                 add_history(line);
 227                 goto restart;
 228             }
 229         }
 230
 231         command += line;
 232
 233         char *begin(line), *end(line + strlen(line));
 234         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 235             *nl = '\0';
 236             lines.push_back(begin);
 237             begin = nl + 1;
 238         }
 239
 240         lines.push_back(begin);
 241
 242         free(line);
 243
 244         std::string code;
 245
 246         if (bypass)
 247             code = command;
 248         else {
 249             CYDriver driver("");
 250             cy::parser parser(driver);
 251             Setup(driver, parser);
 252
 253             driver.data_ = command.c_str();
 254             driver.size_ = command.size();
 255
 256             if (parser.parse() != 0 || !driver.errors_.empty()) {
 257                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 258                     cy::position begin(error->location_.begin);
 259                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 260                         cy::position end(error->location_.end);
 261
 262                         if (begin.line != lines.size()) {
 263                             std::cerr << "  | ";
 264                             std::cerr << lines[begin.line - 1] << std::endl;
 265                         }
 266
 267                         std::cerr << "....";
 268                         for (size_t i(0); i != begin.column - 1; ++i)
 269                             std::cerr << '.';
 270                         if (begin.line != end.line || begin.column == end.column)
 271                             std::cerr << '^';
 272                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 273                             std::cerr << '^';
 274                         std::cerr << std::endl;
 275
 276                         std::cerr << "  | ";
 277                         std::cerr << error->message_ << std::endl;
 278
 279                         add_history(command.c_str());
 280                         goto restart;
 281                     }
 282                 }
 283
 284                 driver.errors_.clear();
 285
 286                 command += '\n';
 287                 prompt = "cy> ";
 288                 goto read;
 289             }
 290
 291             if (driver.program_ == NULL)
 292                 goto restart;
 293
 294             if (socket != -1)
 295                 code = command;
 296             else {
 297                 std::ostringstream str;
 298                 CYOutput out(str);
 299                 Setup(out, driver);
 300                 out << *driver.program_;
 301                 code = str.str();
 302             }
 303         }
 304
 305         add_history(command.c_str());
 306
 307         if (debug)
 308             std::cout << code << std::endl;
 309
 310         Run(socket, code, fout, expand);
 311     }
 312
 313     fputs("\n", fout);
 314     fflush(fout);
 315 }
 316
 317 static void *Map(const char *path, size_t *psize) {
 318     int fd;
 319     _syscall(fd = open(path, O_RDONLY));
 320
 321     struct stat stat;
 322     _syscall(fstat(fd, &stat));
 323     size_t size(stat.st_size);
 324
 325     *psize = size;
 326
 327     void *base;
 328     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 329
 330     _syscall(close(fd));
 331     return base;
 332 }
 333
 334 int main(int argc, char *argv[]) {
 335     bool tty(isatty(STDIN_FILENO));
 336     pid_t pid(_not(pid_t));
 337     bool compile(false);
 338
 339     for (;;) switch (getopt(argc, argv, "cg:n:p:s")) {
 340         case -1:
 341             goto getopt;
 342         case '?':
 343             fprintf(stderr, "usage: cycript [-c] [-p <pid>] [<script> [<arg>...]]\n");
 344             return 1;
 345
 346         case 'c':
 347             compile = true;
 348         break;
 349
 350         case 'g':
 351             if (false);
 352 #if YYDEBUG
 353             else if (strcmp(optarg, "bison") == 0)
 354                 bison_ = true;
 355 #endif
 356             else {
 357                 fprintf(stderr, "invalid name for -g\n");
 358                 return 1;
 359             }
 360         break;
 361
 362         case 'n':
 363             if (false);
 364             else if (strcmp(optarg, "minify") == 0)
 365                 pretty_ = true;
 366             else {
 367                 fprintf(stderr, "invalid name for -n\n");
 368                 return 1;
 369             }
 370         break;
 371
 372         case 'p': {
 373             size_t size(strlen(optarg));
 374             char *end;
 375             pid = strtoul(optarg, &end, 0);
 376             if (optarg + size != end) {
 377                 fprintf(stderr, "invalid pid for -p\n");
 378                 return 1;
 379             }
 380         } break;
 381
 382         case 's':
 383             strict_ = true;
 384         break;
 385     } getopt:;
 386
 387     const char *script;
 388
 389     if (pid != _not(pid_t) && optind < argc - 1) {
 390         fprintf(stderr, "-p cannot set argv\n");
 391         return 1;
 392     }
 393
 394     if (pid != _not(pid_t) && compile) {
 395         fprintf(stderr, "-p conflicts with -c\n");
 396         return 1;
 397     }
 398
 399     if (optind == argc)
 400         script = NULL;
 401     else {
 402         // XXX: const_cast?! wtf gcc :(
 403         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 404         script = argv[optind];
 405         if (strcmp(script, "-") == 0)
 406             script = NULL;
 407     }
 408
 409     if (script == NULL && !tty && pid != _not(pid_t)) {
 410         fprintf(stderr, "non-terminal attaching to remove console\n");
 411         return 1;
 412     }
 413
 414     int socket;
 415
 416     if (pid == _not(pid_t))
 417         socket = -1;
 418     else {
 419         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 420
 421         struct sockaddr_un address;
 422         memset(&address, 0, sizeof(address));
 423         address.sun_family = AF_UNIX;
 424         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 425
 426         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 427     }
 428
 429     if (script == NULL && tty)
 430         Console(socket);
 431     else {
 432         CYDriver driver(script ?: "<stdin>");
 433         cy::parser parser(driver);
 434         Setup(driver, parser);
 435
 436         char *start, *end;
 437
 438         if (script == NULL) {
 439             start = NULL;
 440             end = NULL;
 441
 442             driver.file_ = stdin;
 443         } else {
 444             size_t size;
 445             start = reinterpret_cast<char *>(Map(script, &size));
 446             end = start + size;
 447
 448             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 449                 start += 2;
 450
 451                 if (void *line = memchr(start, '\n', end - start))
 452                     start = reinterpret_cast<char *>(line);
 453                 else
 454                     start = end;
 455             }
 456
 457             driver.data_ = start;
 458             driver.size_ = end - start;
 459         }
 460
 461         if (parser.parse() != 0 || !driver.errors_.empty()) {
 462             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 463                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 464         } else if (driver.program_ != NULL)
 465             if (socket != -1)
 466                 Run(socket, start, end - start, stdout);
 467             else {
 468                 std::ostringstream str;
 469                 CYOutput out(str);
 470                 Setup(out, driver);
 471                 out << *driver.program_;
 472                 std::string code(str.str());
 473                 if (compile)
 474                     std::cout << code;
 475                 else
 476                     Run(socket, code, stdout);
 477             }
 478     }
 479
 480     return 0;
 481 }