cpython/Modules/_scproxy.c at main · python/cpython · GitHub

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* Helper method for urllib to fetch the proxy configuration settings

* using the SystemConfiguration framework.

// Need limited C API version 3.13 for Py_mod_gil

#include "pyconfig.h" // Py_GIL_DISABLED

#ifndef Py_GIL_DISABLED

# define Py_LIMITED_API 0x030d0000

#endif

#include <Python.h>

#include <SystemConfiguration/SystemConfiguration.h>

static int32_t

cfnum_to_int32(CFNumberRef num)

{

int32_t result;

CFNumberGetValue(num, kCFNumberSInt32Type, &result);

return result;

}

static PyObject*

cfstring_to_pystring(CFStringRef ref)

{

const char* s;

s = CFStringGetCStringPtr(ref, kCFStringEncodingUTF8);

if (s) {

return PyUnicode_DecodeUTF8(s, strlen(s), NULL);

} else {

CFIndex len = CFStringGetLength(ref);

Boolean ok;

PyObject* result;

char* buf;

buf = PyMem_Malloc(len*4);

if (buf == NULL) {

PyErr_NoMemory();

return NULL;

}

ok = CFStringGetCString(ref,

buf, len * 4,

kCFStringEncodingUTF8);

if (!ok) {

PyMem_Free(buf);

return NULL;

} else {

result = PyUnicode_DecodeUTF8(buf, strlen(buf), NULL);

PyMem_Free(buf);

}

return result;

}

static PyObject*

get_proxy_settings(PyObject* Py_UNUSED(mod), PyObject *Py_UNUSED(ignored))

{

CFDictionaryRef proxyDict = NULL;

CFNumberRef aNum = NULL;

CFArrayRef anArray = NULL;

PyObject* result = NULL;

PyObject* v;

int r;

Py_BEGIN_ALLOW_THREADS

proxyDict = SCDynamicStoreCopyProxies(NULL);

Py_END_ALLOW_THREADS

if (!proxyDict) {

Py_RETURN_NONE;

}

result = PyDict_New();

if (result == NULL) goto error;

aNum = CFDictionaryGetValue(proxyDict,

kSCPropNetProxiesExcludeSimpleHostnames);

if (aNum == NULL) {

v = PyBool_FromLong(0);

} else {

v = PyBool_FromLong(cfnum_to_int32(aNum));

}

if (v == NULL) goto error;

r = PyDict_SetItemString(result, "exclude_simple", v);

Py_CLEAR(v);

if (r == -1) goto error;

anArray = CFDictionaryGetValue(proxyDict,

kSCPropNetProxiesExceptionsList);

if (anArray != NULL) {

CFIndex len = CFArrayGetCount(anArray);

CFIndex i;

v = PyTuple_New(len);

if (v == NULL) goto error;

r = PyDict_SetItemString(result, "exceptions", v);

Py_DECREF(v);

if (r == -1) goto error;

for (i = 0; i < len; i++) {

CFStringRef aString = NULL;

aString = CFArrayGetValueAtIndex(anArray, i);

if (aString == NULL) {

PyTuple_SetItem(v, i, Py_NewRef(Py_None));

} else {

PyObject* t = cfstring_to_pystring(aString);

if (!t) {

PyTuple_SetItem(v, i, Py_NewRef(Py_None));

} else {

PyTuple_SetItem(v, i, t);

}

CFRelease(proxyDict);

return result;

error:

if (proxyDict) CFRelease(proxyDict);

Py_XDECREF(result);

return NULL;

}

static int

set_proxy(PyObject* proxies, const char* proto, CFDictionaryRef proxyDict,

CFStringRef enabledKey,

CFStringRef hostKey, CFStringRef portKey)

{

CFNumberRef aNum;

aNum = CFDictionaryGetValue(proxyDict, enabledKey);

if (aNum && cfnum_to_int32(aNum)) {

CFStringRef hostString;

hostString = CFDictionaryGetValue(proxyDict, hostKey);

aNum = CFDictionaryGetValue(proxyDict, portKey);

if (hostString) {

int r;

PyObject* h = cfstring_to_pystring(hostString);

PyObject* v;

if (h) {

if (aNum) {

int32_t port = cfnum_to_int32(aNum);

v = PyUnicode_FromFormat("http://%U:%ld", h, (long)port);

} else {

v = PyUnicode_FromFormat("http://%U", h);

}

Py_DECREF(h);

if (!v) return -1;

r = PyDict_SetItemString(proxies, proto, v);

Py_DECREF(v);

return r;

}

return 0;

}

static PyObject*

get_proxies(PyObject* Py_UNUSED(mod), PyObject *Py_UNUSED(ignored))

{

PyObject* result = NULL;

int r;

CFDictionaryRef proxyDict = NULL;

Py_BEGIN_ALLOW_THREADS

proxyDict = SCDynamicStoreCopyProxies(NULL);

Py_END_ALLOW_THREADS

if (proxyDict == NULL) {

return PyDict_New();

}

result = PyDict_New();

if (result == NULL) goto error;

r = set_proxy(result, "http", proxyDict,

kSCPropNetProxiesHTTPEnable,

kSCPropNetProxiesHTTPProxy,

kSCPropNetProxiesHTTPPort);

if (r == -1) goto error;

r = set_proxy(result, "https", proxyDict,

kSCPropNetProxiesHTTPSEnable,

kSCPropNetProxiesHTTPSProxy,

kSCPropNetProxiesHTTPSPort);

if (r == -1) goto error;

r = set_proxy(result, "ftp", proxyDict,

kSCPropNetProxiesFTPEnable,

kSCPropNetProxiesFTPProxy,

kSCPropNetProxiesFTPPort);

if (r == -1) goto error;

r = set_proxy(result, "gopher", proxyDict,

kSCPropNetProxiesGopherEnable,

kSCPropNetProxiesGopherProxy,

kSCPropNetProxiesGopherPort);

if (r == -1) goto error;

r = set_proxy(result, "socks", proxyDict,

kSCPropNetProxiesSOCKSEnable,

kSCPropNetProxiesSOCKSProxy,

kSCPropNetProxiesSOCKSPort);

if (r == -1) goto error;

CFRelease(proxyDict);

return result;

error:

if (proxyDict) CFRelease(proxyDict);

Py_XDECREF(result);

return NULL;

}

static PyMethodDef mod_methods[] = {

{

"_get_proxy_settings",

get_proxy_settings,

METH_NOARGS,

NULL,

{

"_get_proxies",

get_proxies,

METH_NOARGS,

NULL,

{ 0, 0, 0, 0 }

};

static PyModuleDef_Slot _scproxy_slots[] = {

{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},

{Py_mod_gil, Py_MOD_GIL_NOT_USED},

{0, NULL}

};

static struct PyModuleDef _scproxy_module = {

PyModuleDef_HEAD_INIT,

.m_name = "_scproxy",

.m_size = 0,

.m_methods = mod_methods,

.m_slots = _scproxy_slots,

};

PyMODINIT_FUNC

PyInit__scproxy(void)

{

return PyModuleDef_Init(&_scproxy_module);

}

cpython/Modules/_scproxy.c at main · python/cpython · GitHub

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