Application.mm

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