Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pj/config.h> |
| 21 | |
| 22 | #define WIN32_LEAN_AND_MEAN |
| 23 | #include <windows.h> |
| 24 | |
| 25 | /* PMIB_ICMP_EX is not declared in VC6, causing error. |
| 26 | * But EVC4, which also claims to be VC6, does have it! |
| 27 | */ |
| 28 | #if defined(_MSC_VER) && _MSC_VER==1200 && !defined(PJ_WIN32_WINCE) |
| 29 | # define PMIB_ICMP_EX void* |
| 30 | #endif |
| 31 | #include <winsock2.h> |
| 32 | |
| 33 | /* If you encounter error "Cannot open include file: 'Iphlpapi.h' here, |
| 34 | * you need to install newer Platform SDK. Presumably you're using |
| 35 | * Microsoft Visual Studio 6? |
| 36 | */ |
| 37 | #include <Iphlpapi.h> |
| 38 | |
| 39 | #include <pj/ip_helper.h> |
| 40 | #include <pj/assert.h> |
| 41 | #include <pj/errno.h> |
| 42 | #include <pj/string.h> |
| 43 | |
| 44 | /* Dealing with Unicode quirks: |
| 45 | |
| 46 | There seems to be a difference with GetProcAddress() API signature between |
| 47 | Windows (i.e. Win32) and Windows CE (e.g. Windows Mobile). On Windows, the |
| 48 | API is declared as: |
| 49 | |
| 50 | FARPROC GetProcAddress( |
| 51 | HMODULE hModule, |
| 52 | LPCSTR lpProcName); |
| 53 | |
| 54 | while on Windows CE: |
| 55 | |
| 56 | FARPROC GetProcAddress( |
| 57 | HMODULE hModule, |
| 58 | LPCWSTR lpProcName); |
| 59 | |
| 60 | Notice the difference with lpProcName argument type. This means that on |
| 61 | Windows, even on Unicode Windows, the lpProcName always takes ANSI format, |
| 62 | while on Windows CE, the argument follows the UNICODE setting. |
| 63 | |
| 64 | Because of this, we use a different Unicode treatment here than the usual |
| 65 | PJ_NATIVE_STRING_IS_UNICODE PJLIB setting (<pj/unicode.h>): |
| 66 | - GPA_TEXT macro: convert literal string to platform's native literal |
| 67 | string |
| 68 | - gpa_char: the platform native character type |
| 69 | |
| 70 | Note that "GPA" and "gpa" are abbreviations for GetProcAddress. |
| 71 | */ |
| 72 | #if defined(PJ_WIN32_WINCE) && PJ_WIN32_WINCE!=0 |
| 73 | /* on CE, follow the PJLIB Unicode setting */ |
| 74 | # define GPA_TEXT(x) PJ_T(x) |
| 75 | # define gpa_char pj_char_t |
| 76 | #else |
| 77 | /* on non-CE, always use ANSI format */ |
| 78 | # define GPA_TEXT(x) x |
| 79 | # define gpa_char char |
| 80 | #endif |
| 81 | |
| 82 | |
| 83 | typedef DWORD (WINAPI *PFN_GetIpAddrTable)(PMIB_IPADDRTABLE pIpAddrTable, |
| 84 | PULONG pdwSize, |
| 85 | BOOL bOrder); |
| 86 | typedef DWORD (WINAPI *PFN_GetAdapterAddresses)(ULONG Family, |
| 87 | ULONG Flags, |
| 88 | PVOID Reserved, |
| 89 | PIP_ADAPTER_ADDRESSES AdapterAddresses, |
| 90 | PULONG SizePointer); |
| 91 | typedef DWORD (WINAPI *PFN_GetIpForwardTable)(PMIB_IPFORWARDTABLE pIpForwardTable, |
| 92 | PULONG pdwSize, |
| 93 | BOOL bOrder); |
| 94 | typedef DWORD (WINAPI *PFN_GetIfEntry)(PMIB_IFROW pIfRow); |
| 95 | |
| 96 | static HANDLE s_hDLL; |
| 97 | static PFN_GetIpAddrTable s_pfnGetIpAddrTable; |
| 98 | static PFN_GetAdapterAddresses s_pfnGetAdapterAddresses; |
| 99 | static PFN_GetIpForwardTable s_pfnGetIpForwardTable; |
| 100 | static PFN_GetIfEntry s_pfnGetIfEntry; |
| 101 | |
| 102 | |
| 103 | static void unload_iphlp_module(void) |
| 104 | { |
| 105 | FreeLibrary(s_hDLL); |
| 106 | s_hDLL = NULL; |
| 107 | s_pfnGetIpAddrTable = NULL; |
| 108 | s_pfnGetIpForwardTable = NULL; |
| 109 | s_pfnGetIfEntry = NULL; |
| 110 | s_pfnGetAdapterAddresses = NULL; |
| 111 | } |
| 112 | |
| 113 | static FARPROC GetIpHlpApiProc(gpa_char *lpProcName) |
| 114 | { |
| 115 | if(NULL == s_hDLL) { |
| 116 | s_hDLL = LoadLibrary(PJ_T("IpHlpApi")); |
| 117 | if(NULL != s_hDLL) { |
| 118 | pj_atexit(&unload_iphlp_module); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | if(NULL != s_hDLL) |
| 123 | return GetProcAddress(s_hDLL, lpProcName); |
| 124 | |
| 125 | return NULL; |
| 126 | } |
| 127 | |
| 128 | static DWORD MyGetIpAddrTable(PMIB_IPADDRTABLE pIpAddrTable, |
| 129 | PULONG pdwSize, |
| 130 | BOOL bOrder) |
| 131 | { |
| 132 | if(NULL == s_pfnGetIpAddrTable) { |
| 133 | s_pfnGetIpAddrTable = (PFN_GetIpAddrTable) |
| 134 | GetIpHlpApiProc(GPA_TEXT("GetIpAddrTable")); |
| 135 | } |
| 136 | |
| 137 | if(NULL != s_pfnGetIpAddrTable) { |
| 138 | return s_pfnGetIpAddrTable(pIpAddrTable, pdwSize, bOrder); |
| 139 | } |
| 140 | |
| 141 | return ERROR_NOT_SUPPORTED; |
| 142 | } |
| 143 | |
| 144 | static DWORD MyGetAdapterAddresses(ULONG Family, |
| 145 | ULONG Flags, |
| 146 | PVOID Reserved, |
| 147 | PIP_ADAPTER_ADDRESSES AdapterAddresses, |
| 148 | PULONG SizePointer) |
| 149 | { |
| 150 | if(NULL == s_pfnGetAdapterAddresses) { |
| 151 | s_pfnGetAdapterAddresses = (PFN_GetAdapterAddresses) |
| 152 | GetIpHlpApiProc(GPA_TEXT("GetAdaptersAddresses")); |
| 153 | } |
| 154 | |
| 155 | if(NULL != s_pfnGetAdapterAddresses) { |
| 156 | return s_pfnGetAdapterAddresses(Family, Flags, Reserved, |
| 157 | AdapterAddresses, SizePointer); |
| 158 | } |
| 159 | |
| 160 | return ERROR_NOT_SUPPORTED; |
| 161 | } |
| 162 | |
| 163 | #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF |
| 164 | static DWORD MyGetIfEntry(MIB_IFROW *pIfRow) |
| 165 | { |
| 166 | if(NULL == s_pfnGetIfEntry) { |
| 167 | s_pfnGetIfEntry = (PFN_GetIfEntry) |
| 168 | GetIpHlpApiProc(GPA_TEXT("GetIfEntry")); |
| 169 | } |
| 170 | |
| 171 | if(NULL != s_pfnGetIfEntry) { |
| 172 | return s_pfnGetIfEntry(pIfRow); |
| 173 | } |
| 174 | |
| 175 | return ERROR_NOT_SUPPORTED; |
| 176 | } |
| 177 | #endif |
| 178 | |
| 179 | |
| 180 | static DWORD MyGetIpForwardTable(PMIB_IPFORWARDTABLE pIpForwardTable, |
| 181 | PULONG pdwSize, |
| 182 | BOOL bOrder) |
| 183 | { |
| 184 | if(NULL == s_pfnGetIpForwardTable) { |
| 185 | s_pfnGetIpForwardTable = (PFN_GetIpForwardTable) |
| 186 | GetIpHlpApiProc(GPA_TEXT("GetIpForwardTable")); |
| 187 | } |
| 188 | |
| 189 | if(NULL != s_pfnGetIpForwardTable) { |
| 190 | return s_pfnGetIpForwardTable(pIpForwardTable, pdwSize, bOrder); |
| 191 | } |
| 192 | |
| 193 | return ERROR_NOT_SUPPORTED; |
| 194 | } |
| 195 | |
| 196 | /* Enumerate local IP interface using GetIpAddrTable() |
| 197 | * for IPv4 addresses only. |
| 198 | */ |
| 199 | static pj_status_t enum_ipv4_interface(unsigned *p_cnt, |
| 200 | pj_sockaddr ifs[]) |
| 201 | { |
| 202 | char ipTabBuff[512]; |
| 203 | MIB_IPADDRTABLE *pTab = (MIB_IPADDRTABLE*)ipTabBuff; |
| 204 | ULONG tabSize = sizeof(ipTabBuff); |
| 205 | unsigned i, count; |
| 206 | DWORD rc = NO_ERROR; |
| 207 | |
| 208 | PJ_ASSERT_RETURN(p_cnt && ifs, PJ_EINVAL); |
| 209 | |
| 210 | /* Get IP address table */ |
| 211 | rc = MyGetIpAddrTable(pTab, &tabSize, FALSE); |
| 212 | if (rc != NO_ERROR) { |
| 213 | if (rc == ERROR_INSUFFICIENT_BUFFER) { |
| 214 | /* Retry with larger buffer */ |
| 215 | pTab = (MIB_IPADDRTABLE*)malloc(tabSize); |
| 216 | if (pTab) |
| 217 | rc = MyGetIpAddrTable(pTab, &tabSize, FALSE); |
| 218 | } |
| 219 | |
| 220 | if (rc != NO_ERROR) { |
| 221 | if (pTab != (MIB_IPADDRTABLE*)ipTabBuff) |
| 222 | free(pTab); |
| 223 | return PJ_RETURN_OS_ERROR(rc); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /* Reset result */ |
| 228 | pj_bzero(ifs, sizeof(ifs[0]) * (*p_cnt)); |
| 229 | |
| 230 | /* Now fill out the entries */ |
| 231 | count = (pTab->dwNumEntries < *p_cnt) ? pTab->dwNumEntries : *p_cnt; |
| 232 | *p_cnt = 0; |
| 233 | for (i=0; i<count; ++i) { |
| 234 | MIB_IFROW ifRow; |
| 235 | |
| 236 | /* Ignore 0.0.0.0 address (interface is down?) */ |
| 237 | if (pTab->table[i].dwAddr == 0) |
| 238 | continue; |
| 239 | |
| 240 | /* Ignore 0.0.0.0/8 address. This is a special address |
| 241 | * which doesn't seem to have practical use. |
| 242 | */ |
| 243 | if ((pj_ntohl(pTab->table[i].dwAddr) >> 24) == 0) |
| 244 | continue; |
| 245 | |
| 246 | #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF |
| 247 | /* Investigate the type of this interface */ |
| 248 | pj_bzero(&ifRow, sizeof(ifRow)); |
| 249 | ifRow.dwIndex = pTab->table[i].dwIndex; |
| 250 | if (MyGetIfEntry(&ifRow) != 0) |
| 251 | continue; |
| 252 | |
| 253 | if (ifRow.dwType == MIB_IF_TYPE_LOOPBACK) |
| 254 | continue; |
| 255 | #endif |
| 256 | |
| 257 | ifs[*p_cnt].ipv4.sin_family = PJ_AF_INET; |
| 258 | ifs[*p_cnt].ipv4.sin_addr.s_addr = pTab->table[i].dwAddr; |
| 259 | (*p_cnt)++; |
| 260 | } |
| 261 | |
| 262 | if (pTab != (MIB_IPADDRTABLE*)ipTabBuff) |
| 263 | free(pTab); |
| 264 | |
| 265 | return (*p_cnt) ? PJ_SUCCESS : PJ_ENOTFOUND; |
| 266 | } |
| 267 | |
| 268 | /* Enumerate local IP interface using GetAdapterAddresses(), |
| 269 | * which works for both IPv4 and IPv6. |
| 270 | */ |
| 271 | static pj_status_t enum_ipv4_ipv6_interface(int af, |
| 272 | unsigned *p_cnt, |
| 273 | pj_sockaddr ifs[]) |
| 274 | { |
| 275 | pj_uint8_t buffer[600]; |
| 276 | IP_ADAPTER_ADDRESSES *adapter = (IP_ADAPTER_ADDRESSES*)buffer; |
| 277 | void *adapterBuf = NULL; |
| 278 | ULONG size = sizeof(buffer); |
| 279 | ULONG flags; |
| 280 | unsigned i; |
| 281 | DWORD rc; |
| 282 | |
| 283 | flags = GAA_FLAG_SKIP_FRIENDLY_NAME | |
| 284 | GAA_FLAG_SKIP_DNS_SERVER | |
| 285 | GAA_FLAG_SKIP_MULTICAST; |
| 286 | |
| 287 | rc = MyGetAdapterAddresses(af, flags, NULL, adapter, &size); |
| 288 | if (rc != ERROR_SUCCESS) { |
| 289 | if (rc == ERROR_BUFFER_OVERFLOW) { |
| 290 | /* Retry with larger memory size */ |
| 291 | adapterBuf = malloc(size); |
| 292 | adapter = (IP_ADAPTER_ADDRESSES*) adapterBuf; |
| 293 | if (adapter != NULL) |
| 294 | rc = MyGetAdapterAddresses(af, flags, NULL, adapter, &size); |
| 295 | } |
| 296 | |
| 297 | if (rc != ERROR_SUCCESS) { |
| 298 | if (adapterBuf) |
| 299 | free(adapterBuf); |
| 300 | return PJ_RETURN_OS_ERROR(rc); |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | /* Reset result */ |
| 305 | pj_bzero(ifs, sizeof(ifs[0]) * (*p_cnt)); |
| 306 | |
| 307 | /* Enumerate interface */ |
| 308 | for (i=0; i<*p_cnt && adapter; adapter = adapter->Next) { |
| 309 | if (adapter->FirstUnicastAddress) { |
| 310 | SOCKET_ADDRESS *pAddr = &adapter->FirstUnicastAddress->Address; |
| 311 | |
| 312 | /* Ignore address family which we didn't request, just in case */ |
| 313 | if (pAddr->lpSockaddr->sa_family != PJ_AF_INET && |
| 314 | pAddr->lpSockaddr->sa_family != PJ_AF_INET6) |
| 315 | { |
| 316 | continue; |
| 317 | } |
| 318 | |
| 319 | /* Apply some filtering to known IPv4 unusable addresses */ |
| 320 | if (pAddr->lpSockaddr->sa_family == PJ_AF_INET) { |
| 321 | const pj_sockaddr_in *addr_in = |
| 322 | (const pj_sockaddr_in*)pAddr->lpSockaddr; |
| 323 | |
| 324 | /* Ignore 0.0.0.0 address (interface is down?) */ |
| 325 | if (addr_in->sin_addr.s_addr == 0) |
| 326 | continue; |
| 327 | |
| 328 | /* Ignore 0.0.0.0/8 address. This is a special address |
| 329 | * which doesn't seem to have practical use. |
| 330 | */ |
| 331 | if ((pj_ntohl(addr_in->sin_addr.s_addr) >> 24) == 0) |
| 332 | continue; |
| 333 | } |
| 334 | |
| 335 | #if PJ_IP_HELPER_IGNORE_LOOPBACK_IF |
| 336 | /* Ignore loopback interfaces */ |
| 337 | /* This should have been IF_TYPE_SOFTWARE_LOOPBACK according to |
| 338 | * MSDN, and this macro should have been declared in Ipifcons.h, |
| 339 | * but some SDK versions don't have it. |
| 340 | */ |
| 341 | if (adapter->IfType == MIB_IF_TYPE_LOOPBACK) |
| 342 | continue; |
| 343 | #endif |
| 344 | |
| 345 | /* Ignore down interface */ |
| 346 | if (adapter->OperStatus != IfOperStatusUp) |
| 347 | continue; |
| 348 | |
| 349 | ifs[i].addr.sa_family = pAddr->lpSockaddr->sa_family; |
| 350 | pj_memcpy(&ifs[i], pAddr->lpSockaddr, pAddr->iSockaddrLength); |
| 351 | ++i; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | if (adapterBuf) |
| 356 | free(adapterBuf); |
| 357 | |
| 358 | *p_cnt = i; |
| 359 | return (*p_cnt) ? PJ_SUCCESS : PJ_ENOTFOUND; |
| 360 | } |
| 361 | |
| 362 | |
| 363 | /* |
| 364 | * Enumerate the local IP interface currently active in the host. |
| 365 | */ |
| 366 | PJ_DEF(pj_status_t) pj_enum_ip_interface(int af, |
| 367 | unsigned *p_cnt, |
| 368 | pj_sockaddr ifs[]) |
| 369 | { |
| 370 | pj_status_t status = -1; |
| 371 | |
| 372 | PJ_ASSERT_RETURN(p_cnt && ifs, PJ_EINVAL); |
| 373 | PJ_ASSERT_RETURN(af==PJ_AF_UNSPEC || af==PJ_AF_INET || af==PJ_AF_INET6, |
| 374 | PJ_EAFNOTSUP); |
| 375 | |
| 376 | status = enum_ipv4_ipv6_interface(af, p_cnt, ifs); |
| 377 | if (status != PJ_SUCCESS && (af==PJ_AF_INET || af==PJ_AF_UNSPEC)) |
| 378 | status = enum_ipv4_interface(p_cnt, ifs); |
| 379 | return status; |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Enumerate the IP routing table for this host. |
| 384 | */ |
| 385 | PJ_DEF(pj_status_t) pj_enum_ip_route(unsigned *p_cnt, |
| 386 | pj_ip_route_entry routes[]) |
| 387 | { |
| 388 | char ipTabBuff[1024]; |
| 389 | MIB_IPADDRTABLE *pIpTab; |
| 390 | char rtabBuff[1024]; |
| 391 | MIB_IPFORWARDTABLE *prTab; |
| 392 | ULONG tabSize; |
| 393 | unsigned i, count; |
| 394 | DWORD rc = NO_ERROR; |
| 395 | |
| 396 | PJ_ASSERT_RETURN(p_cnt && routes, PJ_EINVAL); |
| 397 | |
| 398 | pIpTab = (MIB_IPADDRTABLE *)ipTabBuff; |
| 399 | prTab = (MIB_IPFORWARDTABLE *)rtabBuff; |
| 400 | |
| 401 | /* First get IP address table */ |
| 402 | tabSize = sizeof(ipTabBuff); |
| 403 | rc = MyGetIpAddrTable(pIpTab, &tabSize, FALSE); |
| 404 | if (rc != NO_ERROR) |
| 405 | return PJ_RETURN_OS_ERROR(rc); |
| 406 | |
| 407 | /* Next get IP route table */ |
| 408 | tabSize = sizeof(rtabBuff); |
| 409 | |
| 410 | rc = MyGetIpForwardTable(prTab, &tabSize, 1); |
| 411 | if (rc != NO_ERROR) |
| 412 | return PJ_RETURN_OS_ERROR(rc); |
| 413 | |
| 414 | /* Reset routes */ |
| 415 | pj_bzero(routes, sizeof(routes[0]) * (*p_cnt)); |
| 416 | |
| 417 | /* Now fill out the route entries */ |
| 418 | count = (prTab->dwNumEntries < *p_cnt) ? prTab->dwNumEntries : *p_cnt; |
| 419 | *p_cnt = 0; |
| 420 | for (i=0; i<count; ++i) { |
| 421 | unsigned j; |
| 422 | |
| 423 | /* Find interface entry */ |
| 424 | for (j=0; j<pIpTab->dwNumEntries; ++j) { |
| 425 | if (pIpTab->table[j].dwIndex == prTab->table[i].dwForwardIfIndex) |
| 426 | break; |
| 427 | } |
| 428 | |
| 429 | if (j==pIpTab->dwNumEntries) |
| 430 | continue; /* Interface not found */ |
| 431 | |
| 432 | routes[*p_cnt].ipv4.if_addr.s_addr = pIpTab->table[j].dwAddr; |
| 433 | routes[*p_cnt].ipv4.dst_addr.s_addr = prTab->table[i].dwForwardDest; |
| 434 | routes[*p_cnt].ipv4.mask.s_addr = prTab->table[i].dwForwardMask; |
| 435 | |
| 436 | (*p_cnt)++; |
| 437 | } |
| 438 | |
| 439 | return PJ_SUCCESS; |
| 440 | } |
| 441 | |