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