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, 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, 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                         if (begin.line != lines.size()) {
 203                             std::cerr << "  | ";
 204                             std::cerr << lines[begin.line - 1] << std::endl;
 205                         }
 206                         std::cerr << "  | ";
 207                         for (size_t i(0); i != begin.column - 1; ++i)
 208                             std::cerr << '.';
 209                         if (begin.line != end.line)
 210                             std::cerr << '^';
 211                         else for (size_t i(0), e(end.column - begin.column); i != e; ++i)
 212                             std::cerr << '^';
 213                         std::cerr << std::endl;
 214                         std::cerr << "  | ";
 215                         std::cerr << error->message_ << std::endl;
 216                         add_history(command.c_str());
 217                         goto restart;
 218                     }
 219                 }
 220
 221                 driver.errors_.clear();
 222
 223                 command += '\n';
 224                 prompt = "cy> ";
 225                 goto read;
 226             }
 227
 228             if (driver.source_ == NULL)
 229                 goto restart;
 230
 231             if (socket != -1)
 232                 code = command;
 233             else {
 234                 std::ostringstream str;
 235                 driver.source_->Show(str);
 236                 code = str.str();
 237             }
 238         }
 239
 240         add_history(command.c_str());
 241
 242         if (debug)
 243             std::cout << code << std::endl;
 244
 245         Run(socket, code, fout, expand);
 246     }
 247
 248     fputs("\n", fout);
 249     fflush(fout);
 250 }
 251
 252 static void *Map(const char *path, size_t *psize) {
 253     int fd;
 254     _syscall(fd = open(path, O_RDONLY));
 255
 256     struct stat stat;
 257     _syscall(fstat(fd, &stat));
 258     size_t size(stat.st_size);
 259
 260     *psize = size;
 261
 262     void *base;
 263     _syscall(base = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0));
 264
 265     _syscall(close(fd));
 266     return base;
 267 }
 268
 269 int main(int argc, char *argv[]) {
 270     pid_t pid(_not(pid_t));
 271
 272     for (;;) switch (getopt(argc, argv, "p:")) {
 273         case -1:
 274             goto getopt;
 275         case '?':
 276             fprintf(stderr, "usage: cycript [-p <pid>] [<script> [<arg>...]]\n");
 277             return 1;
 278
 279         case 'p': {
 280             size_t size(strlen(optarg));
 281             char *end;
 282             pid = strtoul(optarg, &end, 0);
 283             if (optarg + size != end) {
 284                 fprintf(stderr, "invalid pid for -p\n");
 285                 return 1;
 286             }
 287         } break;
 288     } getopt:;
 289
 290     const char *script;
 291
 292     if (optind < argc - 1 && pid != _not(pid_t)) {
 293         fprintf(stderr, "-p cannot set argv\n");
 294         return 1;
 295     }
 296
 297     if (optind == argc)
 298         script = NULL;
 299     else {
 300         // XXX: const_cast?! wtf gcc :(
 301         CYSetArgs(argc - optind - 1, const_cast<const char **>(argv + optind + 1));
 302         script = argv[optind];
 303         if (strcmp(script, "-") == 0)
 304             script = NULL;
 305     }
 306
 307     int socket;
 308
 309     if (pid == _not(pid_t))
 310         socket = -1;
 311     else {
 312         socket = _syscall(::socket(PF_UNIX, SOCK_STREAM, 0));
 313
 314         struct sockaddr_un address;
 315         memset(&address, 0, sizeof(address));
 316         address.sun_family = AF_UNIX;
 317         sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 318
 319         _syscall(connect(socket, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 320     }
 321
 322     if (script == NULL)
 323         Console(socket);
 324     else {
 325         CYDriver driver(script);
 326         cy::parser parser(driver);
 327
 328         size_t size;
 329         char *start(reinterpret_cast<char *>(Map(script, &size)));
 330         char *end(start + size);
 331
 332         if (size >= 2 && start[0] == '#' && start[1] == '!') {
 333             start += 2;
 334
 335             if (void *line = memchr(start, '\n', end - start))
 336                 start = reinterpret_cast<char *>(line);
 337             else
 338                 start = end;
 339         }
 340
 341         driver.data_ = start;
 342         driver.size_ = end - start;
 343
 344         if (parser.parse() != 0 || !driver.errors_.empty()) {
 345             for (CYDriver::Errors::const_iterator i(driver.errors_.begin()); i != driver.errors_.end(); ++i)
 346                 std::cerr << i->location_.begin << ": " << i->message_ << std::endl;
 347         } else if (driver.source_ != NULL)
 348             if (socket != -1)
 349                 Run(socket, start, end - start, stdout);
 350             else {
 351                 std::ostringstream str;
 352                 driver.source_->Show(str);
 353                 std::string code(str.str());
 354                 Run(socket, code, stdout);
 355             }
 356     }
 357
 358     return 0;
 359 }