[196] | 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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