cydo.cpp

   1 #include <cstdio>
   2 #include <cstdlib>
   3
   4 #include <errno.h>
   5 #include <sysexits.h>
   6 #include <unistd.h>
   7
   8 #include <launch.h>
   9
  10 #include <Menes/Function.h>
  11
  12 typedef Function<void, const char *, launch_data_t> LaunchDataIterator;
  13
  14 void launch_data_dict_iterate(launch_data_t data, LaunchDataIterator code) {
  15     launch_data_dict_iterate(data, [](launch_data_t value, const char *name, void *baton) {
  16         (*static_cast<LaunchDataIterator *>(baton))(name, value);
  17     }, &code);
  18 }
  19
  20 int main(int argc, char *argv[]) {
  21     auto request(launch_data_new_string(LAUNCH_KEY_GETJOBS));
  22     auto response(launch_msg(request));
  23     launch_data_free(request);
  24
  25     _assert(response != NULL);
  26     _assert(launch_data_get_type(response) == LAUNCH_DATA_DICTIONARY);
  27
  28     int parent(getppid());
  29
  30     bool cydia(false);
  31
  32     launch_data_dict_iterate(response, [=, &cydia](const char *name, launch_data_t value) {
  33         if (launch_data_get_type(response) != LAUNCH_DATA_DICTIONARY)
  34             return;
  35
  36         auto integer(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PID));
  37         if (integer == NULL || launch_data_get_type(integer) != LAUNCH_DATA_INTEGER)
  38             return;
  39
  40         auto pid(launch_data_get_integer(integer));
  41         if (pid != parent)
  42             return;
  43
  44         auto string(launch_data_dict_lookup(value, LAUNCH_JOBKEY_PROGRAM));
  45         if (string == NULL || launch_data_get_type(string) != LAUNCH_DATA_STRING)
  46             return;
  47
  48         auto program(launch_data_get_string(string));
  49         if (program == NULL)
  50             return;
  51
  52         if (strcmp(program, "/Applications/Cydia.app/Cydia") == 0)
  53             cydia = true;
  54     });
  55
  56     if (!cydia) {
  57         fprintf(stderr, "thou shalt not pass\n");
  58         return EX_NOPERM;
  59     }
  60
  61     setuid(0);
  62     setgid(0);
  63
  64     if (argc < 2 || argv[1][0] != '/')
  65         argv[0] = "/usr/bin/dpkg";
  66     else {
  67         --argc;
  68         ++argv;
  69     }
  70
  71     execv(argv[0], argv);
  72     return EX_UNAVAILABLE;
  73 }