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 "cycript.hpp"
  43
  44 #include <cstdio>
  45 #include <sstream>
  46
  47 #include <setjmp.h>
  48
  49 #include <readline/readline.h>
  50 #include <readline/history.h>
  51
  52 #include <sys/mman.h>
  53
  54 #include <errno.h>
  55 #include <unistd.h>
  56
  57 #include <sys/types.h>
  58 #include <sys/stat.h>
  59 #include <fcntl.h>
  60
  61 #include "Cycript.tab.hh"
  62
  63 #include <sys/types.h>
  64 #include <sys/socket.h>
  65 #include <netinet/in.h>
  66 #include <sys/un.h>
  67
  68 static volatile enum {
  69     Working,
  70     Parsing,
  71     Running,
  72     Sending,
  73     Waiting,
  74 } mode_;
  75
  76 static jmp_buf ctrlc_;
  77
  78 static void sigint(int) {
  79     switch (mode_) {
  80         case Working:
  81             return;
  82         case Parsing:
  83             longjmp(ctrlc_, 1);
  84         case Running:
  85             throw "*** Ctrl-C";
  86         case Sending:
  87             return;
  88         case Waiting:
  89             return;
  90     }
  91 }
  92
  93 #if YYDEBUG
  94 static bool bison_;
  95 #endif
  96 static bool strict_;
  97 static bool pretty_;
  98
  99 void Setup(CYDriver &driver, cy::parser &parser) {
 100 #if YYDEBUG
 101     if (bison_)
 102         parser.set_debug_level(1);
 103 #endif
 104     if (strict_)
 105         driver.strict_ = true;
 106 }
 107
 108 void Setup(CYOutput &out, CYDriver &driver) {
 109     out.pretty_ = pretty_;
 110
 111     CYContext context(driver.pool_);
 112     driver.program_->Replace(context);
 113 }
 114
 115 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
 116     CYPool pool;
 117
 118     const char *json;
 119     if (socket == -1) {
 120         mode_ = Running;
 121         json = CYExecute(pool, data);
 122         mode_ = Working;
 123         if (json != NULL)
 124             size = strlen(json);
 125     } else {
 126         mode_ = Sending;
 127         CYSendAll(socket, &size, sizeof(size));
 128         CYSendAll(socket, data, size);
 129         mode_ = Waiting;
 130         CYRecvAll(socket, &size, sizeof(size));
 131         if (size == _not(size_t))
 132             json = NULL;
 133         else {
 134             char *temp(new(pool) char[size + 1]);
 135             CYRecvAll(socket, temp, size);
 136             temp[size] = '\0';
 137             json = temp;
 138         }
 139         mode_ = Working;
 140     }
 141
 142     if (json != NULL && fout != NULL) {
 143         if (!expand || json[0] != '"' && json[0] != '\'')
 144             fputs(json, fout);
 145         else for (size_t i(0); i != size; ++i)
 146             if (json[i] != '\\')
 147                 fputc(json[i], fout);
 148             else switch(json[++i]) {
 149                 case '\0': goto done;
 150                 case '\\': fputc('\\', fout); break;
 151                 case '\'': fputc('\'', fout); break;
 152                 case '"': fputc('"', fout); break;
 153                 case 'b': fputc('\b', fout); break;
 154                 case 'f': fputc('\f', fout); break;
 155                 case 'n': fputc('\n', fout); break;
 156                 case 'r': fputc('\r', fout); break;
 157                 case 't': fputc('\t', fout); break;
 158                 case 'v': fputc('\v', fout); break;
 159                 default: fputc('\\', fout); --i; break;
 160             }
 161
 162       done:
 163         fputs("\n", fout);
 164         fflush(fout);
 165     }
 166 }
 167
 168 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 169     Run(socket, code.c_str(), code.size(), fout, expand);
 170 }
 171
 172 static void Console(int socket) {
 173     bool bypass(false);
 174     bool debug(false);
 175     bool expand(false);
 176
 177     FILE *fout(stdout);
 178
 179     rl_bind_key('\t', rl_insert);
 180
 181     struct sigaction action;
 182     sigemptyset(&action.sa_mask);
 183     action.sa_handler = &sigint;
 184     action.sa_flags = 0;
 185     sigaction(SIGINT, &action, NULL);
 186
 187     restart: for (;;) {
 188         std::string command;
 189         std::vector<std::string> lines;
 190
 191         bool extra(false);
 192         const char *prompt("cy# ");
 193
 194         if (setjmp(ctrlc_) != 0) {
 195             mode_ = Working;
 196             fputs("\n", fout);
 197             fflush(fout);
 198             goto restart;
 199         }
 200
 201       read:
 202         mode_ = Parsing;
 203         char *line(readline(prompt));
 204         mode_ = Working;
 205         if (line == NULL)
 206             break;
 207
 208         if (!extra) {
 209             extra = true;
 210             if (line[0] == '?') {
 211                 std::string data(line + 1);
 212                 if (data == "bypass") {
 213                     bypass = !bypass;
 214                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 215                     fflush(fout);
 216                 } else if (data == "debug") {
 217                     debug = !debug;
 218                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 219                     fflush(fout);
 220                 } else if (data == "expand") {
 221                     expand = !expand;
 222                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 223                     fflush(fout);
 224                 }
 225                 add_history(line);
 226                 goto restart;
 227             }
 228         }
 229
 230         command += line;
 231
 232         char *begin(line), *end(line + strlen(line));
 233         while (char *nl = reinterpret_cast<char *>(memchr(begin, '\n', end - begin))) {
 234             *nl = '\0';
 235             lines.push_back(begin);
 236             begin = nl + 1;
 237         }
 238
 239         lines.push_back(begin);
 240
 241         free(line);
 242
 243         std::string code;
 244
 245         if (bypass)
 246             code = command;
 247         else {
 248             CYDriver driver("");
 249             cy::parser parser(driver);
 250             Setup(driver, parser);
 251
 252             driver.data_ = command.c_str();
 253             driver.size_ = command.size();
 254
 255             if (parser.parse() != 0 || !driver.errors_.empty()) {
 256                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 257                     cy::position begin(error->location_.begin);
 258                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size() || error->warning_) {
 259                         cy::position end(error->location_.end);
 260
 261                         if (begin.line != lines.size()) {
 262                             std::cerr << "  | ";
 263                             std::cerr << lines[begin.line - 1] << std::endl;
 264                         }
 265
 266                         std::cerr << "....";
 267                         for (size_t i(0); i != begin.column - 1; ++i)
 268                             std::cerr << '.';
 269                         if (begin.line != end.line || begin.column == end.column)
 270                             std::cerr << '^';
 271                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 272                             std::cerr << '^';
 273                         std::cerr << std::endl;
 274
 275                         std::cerr << "  | ";
 276                         std::cerr << error->message_ << std::endl;
 277
 278                         add_history(command.c_str());
 279                         goto restart;
 280                     }
 281                 }
 282
 283                 driver.errors_.clear();
 284
 285                 command += '\n';
 286                 prompt = "cy> ";
 287                 goto read;
 288             }
 289
 290             if (driver.program_ == NULL)
 291                 goto restart;
 292
 293             if (socket != -1)
 294                 code = command;
 295             else {
 296                 std::ostringstream str;
 297                 CYOutput out(str);
 298                 Setup(out, driver);
 299                 out << *driver.program_;
 300                 code = str.str();
 301             }
 302         }
 303
 304         add_history(command.c_str());
 305
 306         if (debug)
 307             std::cout << code << std::endl;
 308
 309         Run(socket, code, fout, expand);
 310     }
 311
 312     fputs("\n", fout);
 313     fflush(fout);
 314 }
 315
 316 static void *Map(const char *path, size_t *psize) {
 317     int fd;
 318     _syscall(fd = open(path, O_RDONLY));
 319
 320     struct stat stat;
 321     _syscall(fstat(fd, &stat));
 322     size_t size(stat.st_size);
 323
 324     *psize = size;
 325
 326     void *base;
 327     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 328
 329     _syscall(close(fd));
 330     return base;
 331 }
 332
 333 int main(int argc, char *argv[]) {
 334     bool tty(isatty(STDIN_FILENO));
 335     pid_t pid(_not(pid_t));
 336     bool compile(false);
 337
 338     for (;;) switch (getopt(argc, argv, "cg:n:p:s")) {
 339         case -1:
 340             goto getopt;
 341         case '?':
 342             fprintf(stderr, "usage: cycript [-c] [-p <pid>] [<script> [<arg>...]]\n");
 343             return 1;
 344
 345         case 'c':
 346             compile = true;
 347         break;
 348
 349         case 'g':
 350             if (false);
 351 #if YYDEBUG
 352             else if (strcmp(optarg, "bison") == 0)
 353                 bison_ = true;
 354 #endif
 355             else {
 356                 fprintf(stderr, "invalid name for -g\n");
 357                 return 1;
 358             }
 359         break;
 360
 361         case 'n':
 362             if (false);
 363             else if (strcmp(optarg, "minify") == 0)
 364                 pretty_ = true;
 365             else {
 366                 fprintf(stderr, "invalid name for -n\n");
 367                 return 1;
 368             }
 369         break;
 370
 371         case 'p': {
 372             size_t size(strlen(optarg));
 373             char *end;
 374             pid = strtoul(optarg, &end, 0);
 375             if (optarg + size != end) {
 376                 fprintf(stderr, "invalid pid for -p\n");
 377                 return 1;
 378             }
 379         } break;
 380
 381         case 's':
 382             strict_ = true;
 383         break;
 384     } getopt:;
 385
 386     const char *script;
 387
 388     if (pid != _not(pid_t) && optind < argc - 1) {
 389         fprintf(stderr, "-p cannot set argv\n");
 390         return 1;
 391     }
 392
 393     if (pid != _not(pid_t) && compile) {
 394         fprintf(stderr, "-p conflicts with -c\n");
 395         return 1;
 396     }
 397
 398     if (optind == argc)
 399         script = NULL;
 400     else {
 401         // XXX: const_cast?! wtf gcc :(
 402         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 403         script = argv[optind];
 404         if (strcmp(script, "-") == 0)
 405             script = NULL;
 406     }
 407
 408     if (script == NULL && !tty && pid != _not(pid_t)) {
 409         fprintf(stderr, "non-terminal attaching to remove console\n");
 410         return 1;
 411     }
 412
 413     int socket;
 414
 415     if (pid == _not(pid_t))
 416         socket = -1;
 417     else {
 418         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 419
 420         struct sockaddr_un address;
 421         memset(&address, 0, sizeof(address));
 422         address.sun_family = AF_UNIX;
 423         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 424
 425         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 426     }
 427
 428     if (script == NULL && tty)
 429         Console(socket);
 430     else {
 431         CYDriver driver(script ?: "<stdin>");
 432         cy::parser parser(driver);
 433         Setup(driver, parser);
 434
 435         char *start, *end;
 436
 437         if (script == NULL) {
 438             start = NULL;
 439             end = NULL;
 440
 441             driver.file_ = stdin;
 442         } else {
 443             size_t size;
 444             start = reinterpret_cast<char *>(Map(script, &size));
 445             end = start + size;
 446
 447             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 448                 start += 2;
 449
 450                 if (void *line = memchr(start, '\n', end - start))
 451                     start = reinterpret_cast<char *>(line);
 452                 else
 453                     start = end;
 454             }
 455
 456             driver.data_ = start;
 457             driver.size_ = end - start;
 458         }
 459
 460         if (parser.parse() != 0 || !driver.errors_.empty()) {
 461             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 462                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 463         } else if (driver.program_ != NULL)
 464             if (socket != -1)
 465                 Run(socket, start, end - start, stdout);
 466             else {
 467                 std::ostringstream str;
 468                 CYOutput out(str);
 469                 Setup(out, driver);
 470                 out << *driver.program_;
 471                 std::string code(str.str());
 472                 if (compile)
 473                     std::cout << code;
 474                 else
 475                     Run(socket, code, stdout);
 476             }
 477     }
 478
 479     return 0;
 480 }