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