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