Ruby 2.7.0p0(2019-12-25revision647ee6f091eafcce70ffb75ddf7e121e192ab217)

resolv.c
Go to the documentation of this file.
1 #include <ruby.h>
2 #include <ruby/encoding.h>
3 #include <windows.h>
4 #ifndef NTDDI_VERSION
5 #define NTDDI_VERSION 0x06000000
6 #endif
7 #include <iphlpapi.h>
8
9 static VALUE
10 w32error_make_error(DWORD e)
11 {
12 VALUE code = ULONG2NUM(e);
13 return rb_class_new_instance(1, &code, rb_path2class("Win32::Resolv::Error"));
14 }
15
16 static void
17 w32error_raise(DWORD e)
18 {
19 rb_exc_raise(w32error_make_error(e));
20 }
21
22 static VALUE
23 get_dns_server_list(VALUE self)
24 {
25 FIXED_INFO *fixedinfo = NULL;
26 ULONG buflen = 0;
27 DWORD ret;
28 VALUE buf, nameservers = Qnil;
29
30 ret = GetNetworkParams(NULL, &buflen);
31 if (ret != NO_ERROR && ret != ERROR_BUFFER_OVERFLOW) {
32 w32error_raise(ret);
33 }
34 fixedinfo = ALLOCV(buf, buflen);
35 ret = GetNetworkParams(fixedinfo, &buflen);
36 if (ret == NO_ERROR) {
37 const IP_ADDR_STRING *ipaddr = &fixedinfo->DnsServerList;
38 nameservers = rb_ary_new();
39 do {
40 const char *s = ipaddr->IpAddress.String;
41 if (!*s) continue;
42 if (strcmp(s, "0.0.0.0") == 0) continue;
43 rb_ary_push(nameservers, rb_str_new_cstr(s));
44 } while ((ipaddr = ipaddr->Next) != NULL);
45 }
46 ALLOCV_END(buf);
47 if (ret != NO_ERROR) w32error_raise(ret);
48
49 return nameservers;
50 }
51
52 void
53 InitVM_resolv(void)
54 {
55 VALUE mWin32 = rb_define_module("Win32");
56 VALUE resolv = rb_define_module_under(mWin32, "Resolv");
57 VALUE singl = rb_singleton_class(resolv);
58 rb_define_private_method(singl, "get_dns_server_list", get_dns_server_list, 0);
59 }
60
61 void
62 Init_resolv(void)
63 {
64 InitVM(resolv);
65 }
InitVM_resolv
void InitVM_resolv(void)
Definition: resolv.c:53
rb_define_module_under
VALUE rb_define_module_under(VALUE outer, const char *name)
Definition: class.c:797
VALUE
unsigned long VALUE
Definition: ruby.h:102
encoding.h
rb_define_module
VALUE rb_define_module(const char *name)
Definition: class.c:772
DWORD
IUnknown DWORD
Definition: win32ole.c:33
NULL
#define NULL
Definition: _sdbm.c:101
InitVM
#define InitVM(ext)
Definition: ruby.h:2329
ULONG2NUM
#define ULONG2NUM(x)
Definition: ruby.h:1645
ALLOCV_END
#define ALLOCV_END(v)
Definition: ruby.h:1750
rb_ary_push
VALUE rb_ary_push(VALUE ary, VALUE item)
Definition: array.c:1195
ruby.h
Init_resolv
void Init_resolv(void)
Definition: resolv.c:62
rb_str_new_cstr
#define rb_str_new_cstr(str)
Definition: rb_mjit_min_header-2.7.0.h:6117
strcmp
int strcmp(const char *, const char *)
buf
unsigned char buf[MIME_BUF_SIZE]
Definition: nkf.c:4322
rb_exc_raise
void rb_exc_raise(VALUE mesg)
Raises an exception in the current thread.
Definition: eval.c:667
rb_singleton_class
VALUE rb_singleton_class(VALUE obj)
Returns the singleton class of obj.
Definition: class.c:1725
rb_path2class
VALUE rb_path2class(const char *)
Definition: variable.c:268
rb_class_new_instance
VALUE rb_class_new_instance(int, const VALUE *, VALUE)
Allocates and initializes an instance of klass.
Definition: object.c:1955
rb_ary_new
VALUE rb_ary_new(void)
Definition: array.c:723
Qnil
#define Qnil
Definition: ruby.h:469
rb_define_private_method
void rb_define_private_method(VALUE klass, const char *name, VALUE(*func)(ANYARGS), int argc)
Definition: class.c:1569
ALLOCV
#define ALLOCV(v, n)
Definition: ruby.h:1748