| James Kuszmaul | 82f6c04 | 2021-01-17 11:30:16 -0800 | [diff] [blame^] | 1 | /** |
| 2 | * @file win32/srv.c Get DNS Server IP code for Windows |
| 3 | * |
| 4 | * Copyright (C) 2010 Creytiv.com |
| 5 | */ |
| 6 | #include <winsock2.h> |
| 7 | #include <iphlpapi.h> |
| 8 | #include <io.h> |
| 9 | #include <re_types.h> |
| 10 | #include <re_fmt.h> |
| 11 | #include <re_mbuf.h> |
| 12 | #include <re_list.h> |
| 13 | #include <re_sa.h> |
| 14 | #include <re_dns.h> |
| 15 | #include "../dns.h" |
| 16 | |
| 17 | |
| 18 | #define DEBUG_MODULE "win32/srv" |
| 19 | #define DEBUG_LEVEL 5 |
| 20 | #include <re_dbg.h> |
| 21 | |
| 22 | |
| 23 | int get_windns(char *domain, size_t dsize, struct sa *srvv, uint32_t *n) |
| 24 | { |
| 25 | FIXED_INFO * FixedInfo = NULL; |
| 26 | ULONG ulOutBufLen; |
| 27 | DWORD dwRetVal; |
| 28 | IP_ADDR_STRING * pIPAddr; |
| 29 | HANDLE hLib; |
| 30 | union { |
| 31 | FARPROC proc; |
| 32 | DWORD (WINAPI *_GetNetworkParams)(FIXED_INFO*, DWORD*); |
| 33 | } u; |
| 34 | uint32_t i; |
| 35 | int err; |
| 36 | |
| 37 | if (!srvv || !n || !*n) |
| 38 | return EINVAL; |
| 39 | |
| 40 | hLib = LoadLibrary(TEXT("iphlpapi.dll")); |
| 41 | if (!hLib) |
| 42 | return ENOSYS; |
| 43 | |
| 44 | u.proc = GetProcAddress(hLib, TEXT("GetNetworkParams")); |
| 45 | if (!u.proc) { |
| 46 | err = ENOSYS; |
| 47 | goto out; |
| 48 | } |
| 49 | |
| 50 | FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof( FIXED_INFO )); |
| 51 | ulOutBufLen = sizeof( FIXED_INFO ); |
| 52 | |
| 53 | if (ERROR_BUFFER_OVERFLOW == (*u._GetNetworkParams)(FixedInfo, |
| 54 | &ulOutBufLen)) { |
| 55 | GlobalFree( FixedInfo ); |
| 56 | FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, ulOutBufLen); |
| 57 | } |
| 58 | |
| 59 | if ((dwRetVal = (*u._GetNetworkParams)( FixedInfo, &ulOutBufLen ))) { |
| 60 | DEBUG_WARNING("couldn't get network params (%d)\n", dwRetVal); |
| 61 | err = ENOENT; |
| 62 | goto out; |
| 63 | } |
| 64 | |
| 65 | str_ncpy(domain, FixedInfo->DomainName, dsize); |
| 66 | |
| 67 | #if 0 |
| 68 | printf( "Host Name: %s\n", FixedInfo->HostName); |
| 69 | printf( "Domain Name: %s\n", FixedInfo->DomainName); |
| 70 | printf( "DNS Servers:\n" ); |
| 71 | printf( "\t%s\n", FixedInfo->DnsServerList.IpAddress.String ); |
| 72 | #endif |
| 73 | |
| 74 | i = 0; |
| 75 | pIPAddr = &FixedInfo->DnsServerList; |
| 76 | while (pIPAddr && strlen(pIPAddr->IpAddress.String) > 0) { |
| 77 | err = sa_set_str(&srvv[i], pIPAddr->IpAddress.String, |
| 78 | DNS_PORT); |
| 79 | if (err) { |
| 80 | DEBUG_WARNING("sa_set_str: %s (%m)\n", |
| 81 | pIPAddr->IpAddress.String, err); |
| 82 | } |
| 83 | DEBUG_INFO("dns ip %u: %j\n", i, &srvv[i]); |
| 84 | ++i; |
| 85 | pIPAddr = pIPAddr ->Next; |
| 86 | |
| 87 | if (i >= *n) |
| 88 | break; |
| 89 | } |
| 90 | |
| 91 | *n = i; |
| 92 | DEBUG_INFO("got %u nameservers\n", i); |
| 93 | err = i>0 ? 0 : ENOENT; |
| 94 | |
| 95 | out: |
| 96 | if (FixedInfo) |
| 97 | GlobalFree(FixedInfo); |
| 98 | FreeLibrary(hLib); |
| 99 | return err; |
| 100 | } |