Connector.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 #include <substrate.h>
  41
  42 #include "cycript.hpp"
  43 #include "Pooling.hpp"
  44
  45 #include <sys/types.h>
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <sys/un.h>
  49
  50 #include <apr_thread_proc.h>
  51
  52 #include <fcntl.h>
  53 #include <unistd.h>
  54
  55 #import <CoreFoundation/CFLogUtilities.h>
  56
  57 struct CYServer :
  58     CYData
  59 {
  60     int socket_;
  61 };
  62
  63 apr_status_t CYPoolDLClose_(void *data) {
  64     // XXX: this is an interesting idea
  65     /* void *handle(reinterpret_cast<void *>(data));
  66     dlclose(handle); */
  67     return APR_SUCCESS;
  68 }
  69
  70 static void * APR_THREAD_FUNC Cyrver(apr_thread_t *thread, void *data) {
  71     CYServer *server(reinterpret_cast<CYServer *>(data));
  72
  73     for (;;) {
  74         int socket(_syscall(accept(server->socket_, NULL, NULL)));
  75
  76         if (void *handle = dlopen("/usr/lib/libcycript.dylib", RTLD_LAZY | RTLD_LOCAL)) {
  77             apr_pool_t *pool;
  78             _aprcall(apr_pool_create(&pool, NULL));
  79
  80             apr_pool_cleanup_register(pool, handle, &CYPoolDLClose_, &apr_pool_cleanup_null);
  81
  82             if (void (*CYHandleClient_)(apr_pool_t *, int) = reinterpret_cast<void (*)(apr_pool_t *, int)>(dlsym(handle, "CYHandleClient")))
  83                 (*CYHandleClient_)(pool, socket);
  84             else
  85                 apr_pool_destroy(pool);
  86         } else
  87             CFLog(kCFLogLevelError, CFSTR("CY:Error: cannot load: %s"), dlerror());
  88     }
  89
  90     delete server;
  91     return NULL;
  92 }
  93
  94 static void Unlink() {
  95     pid_t pid(getpid());
  96     char path[104];
  97     sprintf(path, "/tmp/.s.cy.%u", pid);
  98     unlink(path);
  99 }
 100
 101 MSInitialize {
 102     _aprcall(apr_initialize());
 103
 104     CYServer *server(new CYServer());
 105     server->socket_ = _syscall(socket(PF_UNIX, SOCK_STREAM, 0));
 106
 107     struct sockaddr_un address;
 108     memset(&address, 0, sizeof(address));
 109     address.sun_family = AF_UNIX;
 110
 111     pid_t pid(getpid());
 112     sprintf(address.sun_path, "/tmp/.s.cy.%u", pid);
 113
 114     try {
 115         _syscall(bind(server->socket_, reinterpret_cast<sockaddr *>(&address), SUN_LEN(&address)));
 116         atexit(&Unlink);
 117         _syscall(listen(server->socket_, 0));
 118
 119         apr_threadattr_t *attr;
 120         _aprcall(apr_threadattr_create(&attr, server->pool_));
 121
 122         apr_thread_t *thread;
 123         _aprcall(apr_thread_create(&thread, attr, &Cyrver, server, server->pool_));
 124     } catch (...) {
 125         CFLog(kCFLogLevelError, CFSTR("CY:Error: cannot bind unix domain socket"));
 126     }
 127 }