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 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
  95     CYPool pool;
  96
  97     const char *json;
  98     if (socket == -1) {
  99         mode_ = Running;
 100         json = CYExecute(pool, data);
 101         mode_ = Working;
 102         if (json != NULL)
 103             size = strlen(json);
 104     } else {
 105         mode_ = Sending;
 106         CYSendAll(socket, &size, sizeof(size));
 107         CYSendAll(socket, data, size);
 108         mode_ = Waiting;
 109         CYRecvAll(socket, &size, sizeof(size));
 110         if (size == _not(size_t))
 111             json = NULL;
 112         else {
 113             char *temp(new(pool) char[size + 1]);
 114             CYRecvAll(socket, temp, size);
 115             temp[size] = '\0';
 116             json = temp;
 117         }
 118         mode_ = Working;
 119     }
 120
 121     if (json != NULL && fout != NULL) {
 122         if (!expand || json[0] != '"' && json[0] != '\'')
 123             fputs(json, fout);
 124         else for (size_t i(0); i != size; ++i)
 125             if (json[i] != '\\')
 126                 fputc(json[i], fout);
 127             else switch(json[++i]) {
 128                 case '\0': goto done;
 129                 case '\\': fputc('\\', fout); break;
 130                 case '\'': fputc('\'', fout); break;
 131                 case '"': fputc('"', fout); break;
 132                 case 'b': fputc('\b', fout); break;
 133                 case 'f': fputc('\f', fout); break;
 134                 case 'n': fputc('\n', fout); break;
 135                 case 'r': fputc('\r', fout); break;
 136                 case 't': fputc('\t', fout); break;
 137                 case 'v': fputc('\v', fout); break;
 138                 default: fputc('\\', fout); --i; break;
 139             }
 140
 141       done:
 142         fputs("\n", fout);
 143         fflush(fout);
 144     }
 145 }
 146
 147 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 148     Run(socket, code.c_str(), code.size(), fout, expand);
 149 }
 150
 151 static void Console(int socket) {
 152     bool bypass(false);
 153     bool debug(false);
 154     bool expand(false);
 155
 156     FILE *fout(stdout);
 157
 158     rl_bind_key('\t', rl_insert);
 159
 160     struct sigaction action;
 161     sigemptyset(&action.sa_mask);
 162     action.sa_handler = &sigint;
 163     action.sa_flags = 0;
 164     sigaction(SIGINT, &action, NULL);
 165
 166     restart: for (;;) {
 167         std::string command;
 168         std::vector<std::string> lines;
 169
 170         bool extra(false);
 171         const char *prompt("cy# ");
 172
 173         if (setjmp(ctrlc_) != 0) {
 174             mode_ = Working;
 175             fputs("\n", fout);
 176             fflush(fout);
 177             goto restart;
 178         }
 179
 180       read:
 181         mode_ = Parsing;
 182         char *line(readline(prompt));
 183         mode_ = Working;
 184         if (line == NULL)
 185             break;
 186
 187         if (!extra) {
 188             extra = true;
 189             if (line[0] == '?') {
 190                 std::string data(line + 1);
 191                 if (data == "bypass") {
 192                     bypass = !bypass;
 193                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 194                     fflush(fout);
 195                 } else if (data == "debug") {
 196                     debug = !debug;
 197                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 198                     fflush(fout);
 199                 } else if (data == "expand") {
 200                     expand = !expand;
 201                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 202                     fflush(fout);
 203                 }
 204                 add_history(line);
 205                 goto restart;
 206             }
 207         }
 208
 209         command += line;
 210         for (char *state, *token(apr_strtok(line, "\n", &state)); token != NULL; token = apr_strtok(NULL, "\n", &state))
 211             lines.push_back(token);
 212         free(line);
 213
 214         std::string code;
 215
 216         if (bypass)
 217             code = command;
 218         else {
 219             CYDriver driver("");
 220             cy::parser parser(driver);
 221
 222             driver.data_ = command.c_str();
 223             driver.size_ = command.size();
 224
 225             if (parser.parse() != 0 || !driver.errors_.empty()) {
 226                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 227                     cy::position begin(error->location_.begin);
 228                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size()) {
 229                         cy::position end(error->location_.end);
 230
 231                         if (begin.line != lines.size()) {
 232                             std::cerr << "  | ";
 233                             std::cerr << lines[begin.line - 1] << std::endl;
 234                         }
 235
 236                         std::cerr << "  | ";
 237                         for (size_t i(0); i != begin.column - 1; ++i)
 238                             std::cerr << '.';
 239                         if (begin.line != end.line || begin.column == end.column)
 240                             std::cerr << '^';
 241                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 242                             std::cerr << '^';
 243                         std::cerr << std::endl;
 244
 245                         std::cerr << "  | ";
 246                         std::cerr << error->message_ << std::endl;
 247
 248                         add_history(command.c_str());
 249                         goto restart;
 250                     }
 251                 }
 252
 253                 driver.errors_.clear();
 254
 255                 command += '\n';
 256                 prompt = "cy> ";
 257                 goto read;
 258             }
 259
 260             if (driver.source_ == NULL)
 261                 goto restart;
 262
 263             if (socket != -1)
 264                 code = command;
 265             else {
 266                 std::ostringstream str;
 267                 driver.source_->Show(str);
 268                 code = str.str();
 269             }
 270         }
 271
 272         add_history(command.c_str());
 273
 274         if (debug)
 275             std::cout << code << std::endl;
 276
 277         Run(socket, code, fout, expand);
 278     }
 279
 280     fputs("\n", fout);
 281     fflush(fout);
 282 }
 283
 284 static void *Map(const char *path, size_t *psize) {
 285     int fd;
 286     _syscall(fd = open(path, O_RDONLY));
 287
 288     struct stat stat;
 289     _syscall(fstat(fd, &stat));
 290     size_t size(stat.st_size);
 291
 292     *psize = size;
 293
 294     void *base;
 295     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 296
 297     _syscall(close(fd));
 298     return base;
 299 }
 300
 301 int main(int argc, char *argv[]) {
 302     bool tty(isatty(STDIN_FILENO));
 303     pid_t pid(_not(pid_t));
 304
 305     for (;;) switch (getopt(argc, argv, "p:")) {
 306         case -1:
 307             goto getopt;
 308         case '?':
 309             fprintf(stderr, "usage: cycript [-p <pid>] [<script> [<arg>...]]\n");
 310             return 1;
 311
 312         case 'p': {
 313             size_t size(strlen(optarg));
 314             char *end;
 315             pid = strtoul(optarg, &end, 0);
 316             if (optarg + size != end) {
 317                 fprintf(stderr, "invalid pid for -p\n");
 318                 return 1;
 319             }
 320         } break;
 321     } getopt:;
 322
 323     const char *script;
 324
 325     if (optind < argc - 1 && pid != _not(pid_t)) {
 326         fprintf(stderr, "-p cannot set argv\n");
 327         return 1;
 328     }
 329
 330     if (optind == argc)
 331         script = NULL;
 332     else {
 333         // XXX: const_cast?! wtf gcc :(
 334         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 335         script = argv[optind];
 336         if (strcmp(script, "-") == 0)
 337             script = NULL;
 338     }
 339
 340     if (script == NULL && !tty && pid != _not(pid_t)) {
 341         fprintf(stderr, "non-terminal attaching to remove console\n");
 342         return 1;
 343     }
 344
 345     int socket;
 346
 347     if (pid == _not(pid_t))
 348         socket = -1;
 349     else {
 350         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 351
 352         struct sockaddr_un address;
 353         memset(&address, 0, sizeof(address));
 354         address.sun_family = AF_UNIX;
 355         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 356
 357         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 358     }
 359
 360     if (script == NULL && tty)
 361         Console(socket);
 362     else {
 363         CYDriver driver(script ?: "<stdin>");
 364         cy::parser parser(driver);
 365
 366         char *start, *end;
 367
 368         if (script == NULL) {
 369             start = NULL;
 370             end = NULL;
 371
 372             driver.file_ = stdin;
 373         } else {
 374             size_t size;
 375             start = reinterpret_cast<char *>(Map(script, &size));
 376             end = start + size;
 377
 378             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 379                 start += 2;
 380
 381                 if (void *line = memchr(start, '\n', end - start))
 382                     start = reinterpret_cast<char *>(line);
 383                 else
 384                     start = end;
 385             }
 386
 387             driver.data_ = start;
 388             driver.size_ = end - start;
 389         }
 390
 391         if (parser.parse() != 0 || !driver.errors_.empty()) {
 392             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 393                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 394         } else if (driver.source_ != NULL)
 395             if (socket != -1)
 396                 Run(socket, start, end - start, stdout);
 397             else {
 398                 std::ostringstream str;
 399                 driver.source_->Show(str);
 400                 std::string code(str.str());
 401                 Run(socket, code);
 402             }
 403     }
 404
 405     return 0;
 406 }