1 | #include "Python.h"
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2 |
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3 | #include <SystemConfiguration/SystemConfiguration.h>
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4 |
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5 | #define SCNR_REACHABLE "SCNetworkIsReachable"
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6 | static CFStringRef SCNR_Reachable = CFSTR(SCNR_REACHABLE);
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7 | static SCNetworkReachabilityContext SCNR_Context = {0, NULL, NULL, NULL, NULL};
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8 |
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9 | static void
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10 | SCNR_callback(SCNetworkReachabilityRef target,
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11 | SCNetworkConnectionFlags flags, void *tagString);
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12 |
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13 | static Boolean
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14 | SCNR_reachable(SCNetworkConnectionFlags flags) {
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15 | /* not reachable if it requires a non-automatic connection */
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16 | return ((flags & kSCNetworkFlagsReachable) &&
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17 | (!(flags & kSCNetworkFlagsConnectionRequired) ||
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18 | (flags & kSCNetworkFlagsConnectionAutomatic)));
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19 | }
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20 |
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21 | static void
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22 | SCNR_schedule(CFStringRef tagString,
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23 | SCNetworkReachabilityRef target) {
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24 | SCNR_Context.info = (void *)tagString;
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25 | SCNetworkReachabilitySetCallback(target, SCNR_callback, &SCNR_Context);
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26 | SCNetworkReachabilityScheduleWithRunLoop(target,
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27 | CFRunLoopGetCurrent(),
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28 | kCFRunLoopDefaultMode);
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29 | }
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30 |
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31 | static void
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32 | SCNR_callback(SCNetworkReachabilityRef target,
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33 | SCNetworkConnectionFlags flags, void *tagString) {
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34 | if (SCNR_reachable(flags)) {
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35 | CFNotificationCenterPostNotification(CFNotificationCenterGetLocalCenter(),
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36 | SCNR_Reachable, tagString, NULL, false);
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37 | CFRelease((CFStringRef)tagString);
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38 | } else {
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39 | SCNR_schedule(tagString, target);
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40 | }
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41 | }
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42 |
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43 | static PyObject *
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44 | SCNR_notify_when_reachable(PyObject *self, PyObject *args) {
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45 | const char *hostname;
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46 | const char *tag;
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47 | if (!PyArg_ParseTuple(args, "ss", &hostname, &tag))
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48 | return NULL;
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49 |
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50 | SCNetworkConnectionFlags flags;
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51 | if (SCNetworkCheckReachabilityByName(hostname, &flags) &&
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52 | SCNR_reachable(flags))
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53 | return PyBool_FromLong(0);
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54 |
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55 | SCNetworkReachabilityRef target =
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56 | SCNetworkReachabilityCreateWithName(NULL, hostname);
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57 | CFStringRef tagString =
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58 | CFStringCreateWithCString(NULL, tag, kCFStringEncodingUTF8);
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59 |
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60 | SCNR_schedule(tagString, target);
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61 |
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62 | return PyBool_FromLong(1);
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63 | }
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64 |
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65 |
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66 | static PyMethodDef SCNetworkReachabilitymodule_methods[] = {
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67 | {"notify_when_reachable", SCNR_notify_when_reachable, METH_VARARGS,
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68 | "notify_when_reachable(hostname, tag) -> bool\n\n"
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69 | "Deliver the SCNetworkIsReachable runloop notification with object tag\n"
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70 | "when the host becomes reachable, or return false if it's currently\n"
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71 | "reachable."},
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72 | {NULL, NULL, 0, NULL}
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73 | };
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74 |
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75 | PyMODINIT_FUNC
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76 | initSCNetworkReachability(void) {
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77 | PyObject *module = Py_InitModule("SCNetworkReachability",
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78 | SCNetworkReachabilitymodule_methods);
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79 | PyObject *dict = PyModule_GetDict(module);
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80 | PyObject *reachable = PyString_FromString(SCNR_REACHABLE);
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81 | PyDict_SetItemString(dict, SCNR_REACHABLE, reachable);
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82 | Py_DECREF(reachable);
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83 | }
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