1 files changed, 159 insertions, 0 deletions
diff --git a/python/gevent/resolver/dnshelper.c b/python/gevent/resolver/dnshelper.c
new file mode 100644
index 0000000..3befb69
--- /dev/null
+++ b/python/gevent/resolver/dnshelper.c
@@ -0,0 +1,159 @@
+/* Copyright (c) 2011 Denis Bilenko. See LICENSE for details. */
+#include "Python.h"
+#ifdef CARES_EMBED
+#include "ares_setup.h"
+#endif
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+
+#include "ares.h"
+
+#include "cares_ntop.h"
+#include "cares_pton.h"
+
+#if PY_VERSION_HEX < 0x02060000
+  #define PyUnicode_FromString         PyString_FromString
+#elif PY_MAJOR_VERSION < 3
+  #define PyUnicode_FromString         PyBytes_FromString
+#endif
+
+
+static PyObject* _socket_error = 0;
+
+static PyObject*
+get_socket_object(PyObject** pobject, const char* name)
+{
+    if (!*pobject) {
+        PyObject* _socket;
+        _socket = PyImport_ImportModule("_socket");
+        if (_socket) {
+            *pobject = PyObject_GetAttrString(_socket, name);
+            if (!*pobject) {
+                PyErr_WriteUnraisable(Py_None);
+            }
+            Py_DECREF(_socket);
+        }
+        else {
+            PyErr_WriteUnraisable(Py_None);
+        }
+        if (!*pobject) {
+            *pobject = PyExc_IOError;
+        }
+    }
+    return *pobject;
+}
+
+
+static int
+gevent_append_addr(PyObject* list, int family, void* src, char* tmpbuf, size_t tmpsize) {
+    int status = -1;
+    PyObject* tmp;
+    if (ares_inet_ntop(family, src, tmpbuf, tmpsize)) {
+        tmp = PyUnicode_FromString(tmpbuf);
+        if (tmp) {
+            status = PyList_Append(list, tmp);
+            Py_DECREF(tmp);
+        }
+    }
+    return status;
+}
+
+
+static PyObject*
+parse_h_name(struct hostent *h)
+{
+    return PyUnicode_FromString(h->h_name);
+}
+
+
+static PyObject*
+parse_h_aliases(struct hostent *h)
+{
+    char **pch;
+    PyObject *result = NULL;
+    PyObject *tmp;
+
+    result = PyList_New(0);
+
+    if (result && h->h_aliases) {
+        for (pch = h->h_aliases; *pch != NULL; pch++) {
+            if (*pch != h->h_name && strcmp(*pch, h->h_name)) {
+                int status;
+                tmp = PyUnicode_FromString(*pch);
+                if (tmp == NULL) {
+                    break;
+                }
+
+                status = PyList_Append(result, tmp);
+                Py_DECREF(tmp);
+
+                if (status) {
+                    break;
+                }
+            }
+        }
+    }
+
+    return result;
+}
+
+
+static PyObject *
+parse_h_addr_list(struct hostent *h)
+{
+    char **pch;
+    PyObject *result = NULL;
+
+    result = PyList_New(0);
+
+    if (result) {
+        switch (h->h_addrtype) {
+            case AF_INET:
+            {
+                char tmpbuf[sizeof "255.255.255.255"];
+                for (pch = h->h_addr_list; *pch != NULL; pch++) {
+                    if (gevent_append_addr(result, AF_INET, *pch, tmpbuf, sizeof(tmpbuf))) {
+                        break;
+                    }
+                }
+                break;
+            }
+            case AF_INET6:
+            {
+                char tmpbuf[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
+                for (pch = h->h_addr_list; *pch != NULL; pch++) {
+                    if (gevent_append_addr(result, AF_INET6, *pch, tmpbuf, sizeof(tmpbuf))) {
+                        break;
+                    }
+                }
+                break;
+            }
+            default:
+                PyErr_SetString(get_socket_object(&_socket_error, "error"), "unsupported address family");
+                Py_DECREF(result);
+                result = NULL;
+        }
+    }
+
+    return result;
+}
+
+
+static int
+gevent_make_sockaddr(char* hostp, int port, int flowinfo, int scope_id, struct sockaddr_in6* sa6) {
+    if ( ares_inet_pton(AF_INET, hostp, &((struct sockaddr_in*)sa6)->sin_addr.s_addr) > 0 ) {
+        ((struct sockaddr_in*)sa6)->sin_family = AF_INET;
+        ((struct sockaddr_in*)sa6)->sin_port = htons(port);
+        return sizeof(struct sockaddr_in);
+    }
+    else if ( ares_inet_pton(AF_INET6, hostp, &sa6->sin6_addr.s6_addr) > 0 ) {
+        sa6->sin6_family = AF_INET6;
+        sa6->sin6_port = htons(port);
+        sa6->sin6_flowinfo = flowinfo;
+        sa6->sin6_scope_id = scope_id;
+        return sizeof(struct sockaddr_in6);
+    }
+    return -1;
+}