cydo.cpp

   1 /* Cydia - iPhone UIKit Front-End for Debian APT
   2  * Copyright (C) 2008-2015  Jay Freeman (saurik)
   3 */
   4
   5 /* GNU General Public License, Version 3 {{{ */
   6 /*
   7  * Cydia is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation, either version 3 of the License,
  10  * or (at your option) any later version.
  11  *
  12  * Cydia is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with Cydia.  If not, see <http://www.gnu.org/licenses/>.
  19 **/
  20 /* }}} */
  21
  22 #include <cstdio>
  23 #include <cstdlib>
  24
  25 #include <errno.h>
  26 #include <sysexits.h>
  27 #include <unistd.h>
  28
  29 #include <launch.h>
  30
  31 #include <Menes/Function.h>
  32
  33 typedef Function<void, const char *, launch_data_t> LaunchDataIterator;
  34
  35 void launch_data_dict_iterate(launch_data_t data, LaunchDataIterator code) {
  36     launch_data_dict_iterate(data, [](launch_data_t value, const char *name, void *baton) {
  37         (*static_cast<LaunchDataIterator *>(baton))(name, value);
  38     }, &code);
  39 }
  40
  41 int main(int argc, char *argv[]) {
  42     auto log(fopen("/tmp/cydia.log", "a+"));
  43     fprintf(log, "cydo:");
  44     for (int arg(1); arg < argc; ++arg)
  45         fprintf(log, " %s", argv[arg]);
  46     fprintf(log, "\n");
  47
  48     auto request(launch_data_new_string(LAUNCH_KEY_GETJOBS));
  49     auto response(launch_msg(request));
  50     launch_data_free(request);
  51
  52     _assert(response != NULL);
  53     _assert(launch_data_get_type(response) == LAUNCH_DATA_DICTIONARY);
  54
  55     auto parent(getppid());
  56
  57     auto cydia(false);
  58
  59     launch_data_dict_iterate(response, [=, &cydia](const char *name, launch_data_t value) {
  60         if (launch_data_get_type(response) != LAUNCH_DATA_DICTIONARY)
  61             return;
  62
  63         auto integer(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PID));
  64         if (integer == NULL || launch_data_get_type(integer) != LAUNCH_DATA_INTEGER)
  65             return;
  66
  67         auto pid(launch_data_get_integer(integer));
  68         if (pid != parent)
  69             return;
  70
  71         auto variables(launch_data_dict_lookup(value, LAUNCH_JOBKEY_ENVIRONMENTVARIABLES));
  72         if (variables != NULL && launch_data_get_type(variables) == LAUNCH_DATA_DICTIONARY) {
  73             bool dyld(false);
  74
  75             launch_data_dict_iterate(variables, [&dyld](const char *name, launch_data_t value) {
  76                 if (strncmp(name, "DYLD_", 5) == 0)
  77                     dyld = true;
  78             });
  79
  80             if (dyld)
  81                 return;
  82         }
  83
  84         auto string(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PROGRAM));
  85         if (string == NULL || launch_data_get_type(string) != LAUNCH_DATA_STRING) {
  86             auto array(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PROGRAMARGUMENTS));
  87             if (array == NULL || launch_data_get_type(array) != LAUNCH_DATA_ARRAY)
  88                 return;
  89             if (launch_data_array_get_count(array) == 0)
  90                 return;
  91
  92             string = launch_data_array_get_index(array, 0);
  93             if (string == NULL || launch_data_get_type(string) != LAUNCH_DATA_STRING)
  94                 return;
  95         }
  96
  97         auto program(launch_data_get_string(string));
  98         if (program == NULL)
  99             return;
 100
 101         fprintf(log, "%lld %s\n", pid, program);
 102         if (strcmp(program, "/Applications/Cydia.app/Cydia") == 0)
 103             cydia = true;
 104     });
 105
 106     if (!cydia) {
 107         fprintf(stderr, "thou shalt not pass\n");
 108         return EX_NOPERM;
 109     }
 110
 111     fflush(log);
 112     fclose(log);
 113
 114     setuid(0);
 115     setgid(0);
 116
 117     if (argc < 2 || argv[1][0] != '/')
 118         argv[0] = "/usr/bin/dpkg";
 119     else {
 120         --argc;
 121         ++argv;
 122     }
 123
 124     execv(argv[0], argv);
 125     return EX_UNAVAILABLE;
 126 }