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 jmp_buf ctrlc_;
  70
  71 static void sigint(int) {
  72     longjmp(ctrlc_, 1);
  73 }
  74
  75 void Run(int socket, const char *data, size_t size, FILE *fout = NULL, bool expand = false) {
  76     CYPool pool;
  77
  78     const char *json;
  79     if (socket == -1) {
  80         json = CYExecute(pool, data);
  81         if (json != NULL)
  82             size = strlen(json);
  83     } else {
  84         CYSendAll(socket, &size, sizeof(size));
  85         CYSendAll(socket, data, size);
  86         CYRecvAll(socket, &size, sizeof(size));
  87         if (size == _not(size_t))
  88             json = NULL;
  89         else {
  90             char *temp(new(pool) char[size + 1]);
  91             CYRecvAll(socket, temp, size);
  92             temp[size] = '\0';
  93             json = temp;
  94         }
  95     }
  96
  97     if (json != NULL && fout != NULL) {
  98         if (!expand || json[0] != '"' && json[0] != '\'')
  99             fputs(json, fout);
 100         else for (size_t i(0); i != size; ++i)
 101             if (json[i] != '\\')
 102                 fputc(json[i], fout);
 103             else switch(json[++i]) {
 104                 case '\0': goto done;
 105                 case '\\': fputc('\\', fout); break;
 106                 case '\'': fputc('\'', fout); break;
 107                 case '"': fputc('"', fout); break;
 108                 case 'b': fputc('\b', fout); break;
 109                 case 'f': fputc('\f', fout); break;
 110                 case 'n': fputc('\n', fout); break;
 111                 case 'r': fputc('\r', fout); break;
 112                 case 't': fputc('\t', fout); break;
 113                 case 'v': fputc('\v', fout); break;
 114                 default: fputc('\\', fout); --i; break;
 115             }
 116
 117       done:
 118         fputs("\n", fout);
 119         fflush(fout);
 120     }
 121 }
 122
 123 void Run(int socket, std::string &code, FILE *fout = NULL, bool expand = false) {
 124     Run(socket, code.c_str(), code.size(), fout, expand);
 125 }
 126
 127 static void Console(int socket) {
 128     bool bypass(false);
 129     bool debug(false);
 130     bool expand(false);
 131
 132     FILE *fout(stdout);
 133
 134     rl_bind_key('\t', rl_insert);
 135
 136     struct sigaction action;
 137     sigemptyset(&action.sa_mask);
 138     action.sa_handler = &sigint;
 139     action.sa_flags = 0;
 140     sigaction(SIGINT, &action, NULL);
 141
 142     restart: for (;;) {
 143         std::string command;
 144         std::vector<std::string> lines;
 145
 146         bool extra(false);
 147         const char *prompt("cy# ");
 148
 149         if (setjmp(ctrlc_) != 0) {
 150             fputs("\n", fout);
 151             fflush(fout);
 152             goto restart;
 153         }
 154
 155       read:
 156         char *line(readline(prompt));
 157         if (line == NULL)
 158             break;
 159
 160         if (!extra) {
 161             extra = true;
 162             if (line[0] == '?') {
 163                 std::string data(line + 1);
 164                 if (data == "bypass") {
 165                     bypass = !bypass;
 166                     fprintf(fout, "bypass == %s\n", bypass ? "true" : "false");
 167                     fflush(fout);
 168                 } else if (data == "debug") {
 169                     debug = !debug;
 170                     fprintf(fout, "debug == %s\n", debug ? "true" : "false");
 171                     fflush(fout);
 172                 } else if (data == "expand") {
 173                     expand = !expand;
 174                     fprintf(fout, "expand == %s\n", expand ? "true" : "false");
 175                     fflush(fout);
 176                 }
 177                 add_history(line);
 178                 goto restart;
 179             }
 180         }
 181
 182         lines.push_back(line);
 183         command += line;
 184         free(line);
 185
 186         std::string code;
 187
 188         if (bypass)
 189             code = command;
 190         else {
 191             CYDriver driver("");
 192             cy::parser parser(driver);
 193
 194             driver.data_ = command.c_str();
 195             driver.size_ = command.size();
 196
 197             if (parser.parse() != 0 || !driver.errors_.empty()) {
 198                 for (CYDriver::Errors::const_iterator error(driver.errors_.begin()); error != driver.errors_.end(); ++error) {
 199                     cy::position begin(error->location_.begin);
 200                     if (begin.line != lines.size() || begin.column - 1 != lines.back().size()) {
 201                         cy::position end(error->location_.end);
 202
 203                         if (begin.line != lines.size()) {
 204                             std::cerr << "  | ";
 205                             std::cerr << lines[begin.line - 1] << std::endl;
 206                         }
 207
 208                         std::cerr << "  | ";
 209                         for (size_t i(0); i != begin.column - 1; ++i)
 210                             std::cerr << '.';
 211                         if (begin.line != end.line || begin.column == end.column)
 212                             std::cerr << '^';
 213                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 214                             std::cerr << '^';
 215                         std::cerr << std::endl;
 216
 217                         std::cerr << "  | ";
 218                         std::cerr << error->message_ << std::endl;
 219
 220                         add_history(command.c_str());
 221                         goto restart;
 222                     }
 223                 }
 224
 225                 driver.errors_.clear();
 226
 227                 command += '\n';
 228                 prompt = "cy> ";
 229                 goto read;
 230             }
 231
 232             if (driver.source_ == NULL)
 233                 goto restart;
 234
 235             if (socket != -1)
 236                 code = command;
 237             else {
 238                 std::ostringstream str;
 239                 driver.source_->Show(str);
 240                 code = str.str();
 241             }
 242         }
 243
 244         add_history(command.c_str());
 245
 246         if (debug)
 247             std::cout << code << std::endl;
 248
 249         Run(socket, code, fout, expand);
 250     }
 251
 252     fputs("\n", fout);
 253     fflush(fout);
 254 }
 255
 256 static void *Map(const char *path, size_t *psize) {
 257     int fd;
 258     _syscall(fd = open(path, O_RDONLY));
 259
 260     struct stat stat;
 261     _syscall(fstat(fd, &stat));
 262     size_t size(stat.st_size);
 263
 264     *psize = size;
 265
 266     void *base;
 267     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 268
 269     _syscall(close(fd));
 270     return base;
 271 }
 272
 273 int main(int argc, char *argv[]) {
 274     bool tty(isatty(STDIN_FILENO));
 275     pid_t pid(_not(pid_t));
 276
 277     for (;;) switch (getopt(argc, argv, "p:")) {
 278         case -1:
 279             goto getopt;
 280         case '?':
 281             fprintf(stderr, "usage: cycript [-p <pid>] [<script> [<arg>...]]\n");
 282             return 1;
 283
 284         case 'p': {
 285             size_t size(strlen(optarg));
 286             char *end;
 287             pid = strtoul(optarg, &end, 0);
 288             if (optarg + size != end) {
 289                 fprintf(stderr, "invalid pid for -p\n");
 290                 return 1;
 291             }
 292         } break;
 293     } getopt:;
 294
 295     const char *script;
 296
 297     if (optind < argc - 1 && pid != _not(pid_t)) {
 298         fprintf(stderr, "-p cannot set argv\n");
 299         return 1;
 300     }
 301
 302     if (optind == argc)
 303         script = NULL;
 304     else {
 305         // XXX: const_cast?! wtf gcc :(
 306         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 307         script = argv[optind];
 308         if (strcmp(script, "-") == 0)
 309             script = NULL;
 310     }
 311
 312     if (script == NULL && !tty && pid != _not(pid_t)) {
 313         fprintf(stderr, "non-terminal attaching to remove console\n");
 314         return 1;
 315     }
 316
 317     int socket;
 318
 319     if (pid == _not(pid_t))
 320         socket = -1;
 321     else {
 322         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 323
 324         struct sockaddr_un address;
 325         memset(&address, 0, sizeof(address));
 326         address.sun_family = AF_UNIX;
 327         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 328
 329         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 330     }
 331
 332     if (script == NULL && tty)
 333         Console(socket);
 334     else {
 335         CYDriver driver(script ?: "<stdin>");
 336         cy::parser parser(driver);
 337
 338         char *start, *end;
 339
 340         if (script == NULL) {
 341             start = NULL;
 342             end = NULL;
 343
 344             driver.file_ = stdin;
 345         } else {
 346             size_t size;
 347             start = reinterpret_cast<char *>(Map(script, &size));
 348             end = start + size;
 349
 350             if (size >= 2 && start[0] == '#' && start[1] == '!') {
 351                 start += 2;
 352
 353                 if (void *line = memchr(start, '\n', end - start))
 354                     start = reinterpret_cast<char *>(line);
 355                 else
 356                     start = end;
 357             }
 358
 359             driver.data_ = start;
 360             driver.size_ = end - start;
 361         }
 362
 363         if (parser.parse() != 0 || !driver.errors_.empty()) {
 364             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 365                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 366         } else if (driver.source_ != NULL)
 367             if (socket != -1)
 368                 Run(socket, start, end - start, stdout);
 369             else {
 370                 std::ostringstream str;
 371                 driver.source_->Show(str);
 372                 std::string code(str.str());
 373                 Run(socket, code);
 374             }
 375     }
 376
 377     return 0;
 378 }