| 1 | /* |
| 2 | * Windows networking abstraction. |
| 3 | * |
| 4 | * For the IPv6 code in here I am indebted to Jeroen Massar and |
| 5 | * unfix.org. |
| 6 | */ |
| 7 | |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <assert.h> |
| 11 | |
| 12 | #define DEFINE_PLUG_METHOD_MACROS |
| 13 | #include "putty.h" |
| 14 | #include "network.h" |
| 15 | #include "tree234.h" |
| 16 | |
| 17 | #include <ws2tcpip.h> |
| 18 | |
| 19 | #ifndef NO_IPV6 |
| 20 | const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; |
| 21 | const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; |
| 22 | #endif |
| 23 | |
| 24 | #define ipv4_is_loopback(addr) \ |
| 25 | ((p_ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L) |
| 26 | |
| 27 | /* |
| 28 | * We used to typedef struct Socket_tag *Socket. |
| 29 | * |
| 30 | * Since we have made the networking abstraction slightly more |
| 31 | * abstract, Socket no longer means a tcp socket (it could mean |
| 32 | * an ssl socket). So now we must use Actual_Socket when we know |
| 33 | * we are talking about a tcp socket. |
| 34 | */ |
| 35 | typedef struct Socket_tag *Actual_Socket; |
| 36 | |
| 37 | /* |
| 38 | * Mutable state that goes with a SockAddr: stores information |
| 39 | * about where in the list of candidate IP(v*) addresses we've |
| 40 | * currently got to. |
| 41 | */ |
| 42 | typedef struct SockAddrStep_tag SockAddrStep; |
| 43 | struct SockAddrStep_tag { |
| 44 | #ifndef NO_IPV6 |
| 45 | struct addrinfo *ai; /* steps along addr->ais */ |
| 46 | #endif |
| 47 | int curraddr; |
| 48 | }; |
| 49 | |
| 50 | struct Socket_tag { |
| 51 | const struct socket_function_table *fn; |
| 52 | /* the above variable absolutely *must* be the first in this structure */ |
| 53 | char *error; |
| 54 | SOCKET s; |
| 55 | Plug plug; |
| 56 | void *private_ptr; |
| 57 | bufchain output_data; |
| 58 | int connected; |
| 59 | int writable; |
| 60 | int frozen; /* this causes readability notifications to be ignored */ |
| 61 | int frozen_readable; /* this means we missed at least one readability |
| 62 | * notification while we were frozen */ |
| 63 | int localhost_only; /* for listening sockets */ |
| 64 | char oobdata[1]; |
| 65 | int sending_oob; |
| 66 | int oobinline, nodelay, keepalive, privport; |
| 67 | enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof; |
| 68 | SockAddr addr; |
| 69 | SockAddrStep step; |
| 70 | int port; |
| 71 | int pending_error; /* in case send() returns error */ |
| 72 | /* |
| 73 | * We sometimes need pairs of Socket structures to be linked: |
| 74 | * if we are listening on the same IPv6 and v4 port, for |
| 75 | * example. So here we define `parent' and `child' pointers to |
| 76 | * track this link. |
| 77 | */ |
| 78 | Actual_Socket parent, child; |
| 79 | }; |
| 80 | |
| 81 | struct SockAddr_tag { |
| 82 | int refcount; |
| 83 | char *error; |
| 84 | int resolved; |
| 85 | #ifndef NO_IPV6 |
| 86 | struct addrinfo *ais; /* Addresses IPv6 style. */ |
| 87 | #endif |
| 88 | unsigned long *addresses; /* Addresses IPv4 style. */ |
| 89 | int naddresses; |
| 90 | char hostname[512]; /* Store an unresolved host name. */ |
| 91 | }; |
| 92 | |
| 93 | /* |
| 94 | * Which address family this address belongs to. AF_INET for IPv4; |
| 95 | * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has |
| 96 | * not been done and a simple host name is held in this SockAddr |
| 97 | * structure. |
| 98 | */ |
| 99 | #ifndef NO_IPV6 |
| 100 | #define SOCKADDR_FAMILY(addr, step) \ |
| 101 | (!(addr)->resolved ? AF_UNSPEC : \ |
| 102 | (step).ai ? (step).ai->ai_family : AF_INET) |
| 103 | #else |
| 104 | #define SOCKADDR_FAMILY(addr, step) \ |
| 105 | (!(addr)->resolved ? AF_UNSPEC : AF_INET) |
| 106 | #endif |
| 107 | |
| 108 | /* |
| 109 | * Start a SockAddrStep structure to step through multiple |
| 110 | * addresses. |
| 111 | */ |
| 112 | #ifndef NO_IPV6 |
| 113 | #define START_STEP(addr, step) \ |
| 114 | ((step).ai = (addr)->ais, (step).curraddr = 0) |
| 115 | #else |
| 116 | #define START_STEP(addr, step) \ |
| 117 | ((step).curraddr = 0) |
| 118 | #endif |
| 119 | |
| 120 | static tree234 *sktree; |
| 121 | |
| 122 | static int cmpfortree(void *av, void *bv) |
| 123 | { |
| 124 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
| 125 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
| 126 | if (as < bs) |
| 127 | return -1; |
| 128 | if (as > bs) |
| 129 | return +1; |
| 130 | if (a < b) |
| 131 | return -1; |
| 132 | if (a > b) |
| 133 | return +1; |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | static int cmpforsearch(void *av, void *bv) |
| 138 | { |
| 139 | Actual_Socket b = (Actual_Socket) bv; |
| 140 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
| 141 | if (as < bs) |
| 142 | return -1; |
| 143 | if (as > bs) |
| 144 | return +1; |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | DECL_WINDOWS_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA)); |
| 149 | DECL_WINDOWS_FUNCTION(static, int, WSACleanup, (void)); |
| 150 | DECL_WINDOWS_FUNCTION(static, int, closesocket, (SOCKET)); |
| 151 | DECL_WINDOWS_FUNCTION(static, u_long, ntohl, (u_long)); |
| 152 | DECL_WINDOWS_FUNCTION(static, u_long, htonl, (u_long)); |
| 153 | DECL_WINDOWS_FUNCTION(static, u_short, htons, (u_short)); |
| 154 | DECL_WINDOWS_FUNCTION(static, u_short, ntohs, (u_short)); |
| 155 | DECL_WINDOWS_FUNCTION(static, int, gethostname, (char *, int)); |
| 156 | DECL_WINDOWS_FUNCTION(static, struct hostent FAR *, gethostbyname, |
| 157 | (const char FAR *)); |
| 158 | DECL_WINDOWS_FUNCTION(static, struct servent FAR *, getservbyname, |
| 159 | (const char FAR *, const char FAR *)); |
| 160 | DECL_WINDOWS_FUNCTION(static, unsigned long, inet_addr, (const char FAR *)); |
| 161 | DECL_WINDOWS_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr)); |
| 162 | DECL_WINDOWS_FUNCTION(static, int, connect, |
| 163 | (SOCKET, const struct sockaddr FAR *, int)); |
| 164 | DECL_WINDOWS_FUNCTION(static, int, bind, |
| 165 | (SOCKET, const struct sockaddr FAR *, int)); |
| 166 | DECL_WINDOWS_FUNCTION(static, int, setsockopt, |
| 167 | (SOCKET, int, int, const char FAR *, int)); |
| 168 | DECL_WINDOWS_FUNCTION(static, SOCKET, socket, (int, int, int)); |
| 169 | DECL_WINDOWS_FUNCTION(static, int, listen, (SOCKET, int)); |
| 170 | DECL_WINDOWS_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int)); |
| 171 | DECL_WINDOWS_FUNCTION(static, int, shutdown, (SOCKET, int)); |
| 172 | DECL_WINDOWS_FUNCTION(static, int, ioctlsocket, |
| 173 | (SOCKET, long, u_long FAR *)); |
| 174 | DECL_WINDOWS_FUNCTION(static, SOCKET, accept, |
| 175 | (SOCKET, struct sockaddr FAR *, int FAR *)); |
| 176 | DECL_WINDOWS_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int)); |
| 177 | DECL_WINDOWS_FUNCTION(static, int, WSAIoctl, |
| 178 | (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD, |
| 179 | LPDWORD, LPWSAOVERLAPPED, |
| 180 | LPWSAOVERLAPPED_COMPLETION_ROUTINE)); |
| 181 | #ifndef NO_IPV6 |
| 182 | DECL_WINDOWS_FUNCTION(static, int, getaddrinfo, |
| 183 | (const char *nodename, const char *servname, |
| 184 | const struct addrinfo *hints, struct addrinfo **res)); |
| 185 | DECL_WINDOWS_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res)); |
| 186 | DECL_WINDOWS_FUNCTION(static, int, getnameinfo, |
| 187 | (const struct sockaddr FAR * sa, socklen_t salen, |
| 188 | char FAR * host, size_t hostlen, char FAR * serv, |
| 189 | size_t servlen, int flags)); |
| 190 | DECL_WINDOWS_FUNCTION(static, char *, gai_strerror, (int ecode)); |
| 191 | DECL_WINDOWS_FUNCTION(static, int, WSAAddressToStringA, |
| 192 | (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO, |
| 193 | LPSTR, LPDWORD)); |
| 194 | #endif |
| 195 | |
| 196 | static HMODULE winsock_module = NULL; |
| 197 | static WSADATA wsadata; |
| 198 | #ifndef NO_IPV6 |
| 199 | static HMODULE winsock2_module = NULL; |
| 200 | static HMODULE wship6_module = NULL; |
| 201 | #endif |
| 202 | |
| 203 | int sk_startup(int hi, int lo) |
| 204 | { |
| 205 | WORD winsock_ver; |
| 206 | |
| 207 | winsock_ver = MAKEWORD(hi, lo); |
| 208 | |
| 209 | if (p_WSAStartup(winsock_ver, &wsadata)) { |
| 210 | return FALSE; |
| 211 | } |
| 212 | |
| 213 | if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) { |
| 214 | return FALSE; |
| 215 | } |
| 216 | |
| 217 | #ifdef NET_SETUP_DIAGNOSTICS |
| 218 | { |
| 219 | char buf[80]; |
| 220 | sprintf(buf, "Using WinSock %d.%d", hi, lo); |
| 221 | logevent(NULL, buf); |
| 222 | } |
| 223 | #endif |
| 224 | return TRUE; |
| 225 | } |
| 226 | |
| 227 | void sk_init(void) |
| 228 | { |
| 229 | #ifndef NO_IPV6 |
| 230 | winsock2_module = |
| 231 | #endif |
| 232 | winsock_module = load_system32_dll("ws2_32.dll"); |
| 233 | if (!winsock_module) { |
| 234 | winsock_module = load_system32_dll("wsock32.dll"); |
| 235 | } |
| 236 | if (!winsock_module) |
| 237 | fatalbox("Unable to load any WinSock library"); |
| 238 | |
| 239 | #ifndef NO_IPV6 |
| 240 | /* Check if we have getaddrinfo in Winsock */ |
| 241 | if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) { |
| 242 | #ifdef NET_SETUP_DIAGNOSTICS |
| 243 | logevent(NULL, "Native WinSock IPv6 support detected"); |
| 244 | #endif |
| 245 | GET_WINDOWS_FUNCTION(winsock_module, getaddrinfo); |
| 246 | GET_WINDOWS_FUNCTION(winsock_module, freeaddrinfo); |
| 247 | GET_WINDOWS_FUNCTION(winsock_module, getnameinfo); |
| 248 | GET_WINDOWS_FUNCTION(winsock_module, gai_strerror); |
| 249 | } else { |
| 250 | /* Fall back to wship6.dll for Windows 2000 */ |
| 251 | wship6_module = load_system32_dll("wship6.dll"); |
| 252 | if (wship6_module) { |
| 253 | #ifdef NET_SETUP_DIAGNOSTICS |
| 254 | logevent(NULL, "WSH IPv6 support detected"); |
| 255 | #endif |
| 256 | GET_WINDOWS_FUNCTION(wship6_module, getaddrinfo); |
| 257 | GET_WINDOWS_FUNCTION(wship6_module, freeaddrinfo); |
| 258 | GET_WINDOWS_FUNCTION(wship6_module, getnameinfo); |
| 259 | GET_WINDOWS_FUNCTION(wship6_module, gai_strerror); |
| 260 | } else { |
| 261 | #ifdef NET_SETUP_DIAGNOSTICS |
| 262 | logevent(NULL, "No IPv6 support detected"); |
| 263 | #endif |
| 264 | } |
| 265 | } |
| 266 | GET_WINDOWS_FUNCTION(winsock2_module, WSAAddressToStringA); |
| 267 | #else |
| 268 | #ifdef NET_SETUP_DIAGNOSTICS |
| 269 | logevent(NULL, "PuTTY was built without IPv6 support"); |
| 270 | #endif |
| 271 | #endif |
| 272 | |
| 273 | GET_WINDOWS_FUNCTION(winsock_module, WSAAsyncSelect); |
| 274 | GET_WINDOWS_FUNCTION(winsock_module, WSAEventSelect); |
| 275 | GET_WINDOWS_FUNCTION(winsock_module, select); |
| 276 | GET_WINDOWS_FUNCTION(winsock_module, WSAGetLastError); |
| 277 | GET_WINDOWS_FUNCTION(winsock_module, WSAEnumNetworkEvents); |
| 278 | GET_WINDOWS_FUNCTION(winsock_module, WSAStartup); |
| 279 | GET_WINDOWS_FUNCTION(winsock_module, WSACleanup); |
| 280 | GET_WINDOWS_FUNCTION(winsock_module, closesocket); |
| 281 | GET_WINDOWS_FUNCTION(winsock_module, ntohl); |
| 282 | GET_WINDOWS_FUNCTION(winsock_module, htonl); |
| 283 | GET_WINDOWS_FUNCTION(winsock_module, htons); |
| 284 | GET_WINDOWS_FUNCTION(winsock_module, ntohs); |
| 285 | GET_WINDOWS_FUNCTION(winsock_module, gethostname); |
| 286 | GET_WINDOWS_FUNCTION(winsock_module, gethostbyname); |
| 287 | GET_WINDOWS_FUNCTION(winsock_module, getservbyname); |
| 288 | GET_WINDOWS_FUNCTION(winsock_module, inet_addr); |
| 289 | GET_WINDOWS_FUNCTION(winsock_module, inet_ntoa); |
| 290 | GET_WINDOWS_FUNCTION(winsock_module, connect); |
| 291 | GET_WINDOWS_FUNCTION(winsock_module, bind); |
| 292 | GET_WINDOWS_FUNCTION(winsock_module, setsockopt); |
| 293 | GET_WINDOWS_FUNCTION(winsock_module, socket); |
| 294 | GET_WINDOWS_FUNCTION(winsock_module, listen); |
| 295 | GET_WINDOWS_FUNCTION(winsock_module, send); |
| 296 | GET_WINDOWS_FUNCTION(winsock_module, shutdown); |
| 297 | GET_WINDOWS_FUNCTION(winsock_module, ioctlsocket); |
| 298 | GET_WINDOWS_FUNCTION(winsock_module, accept); |
| 299 | GET_WINDOWS_FUNCTION(winsock_module, recv); |
| 300 | GET_WINDOWS_FUNCTION(winsock_module, WSAIoctl); |
| 301 | |
| 302 | /* Try to get the best WinSock version we can get */ |
| 303 | if (!sk_startup(2,2) && |
| 304 | !sk_startup(2,0) && |
| 305 | !sk_startup(1,1)) { |
| 306 | fatalbox("Unable to initialise WinSock"); |
| 307 | } |
| 308 | |
| 309 | sktree = newtree234(cmpfortree); |
| 310 | } |
| 311 | |
| 312 | void sk_cleanup(void) |
| 313 | { |
| 314 | Actual_Socket s; |
| 315 | int i; |
| 316 | |
| 317 | if (sktree) { |
| 318 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 319 | p_closesocket(s->s); |
| 320 | } |
| 321 | freetree234(sktree); |
| 322 | sktree = NULL; |
| 323 | } |
| 324 | |
| 325 | if (p_WSACleanup) |
| 326 | p_WSACleanup(); |
| 327 | if (winsock_module) |
| 328 | FreeLibrary(winsock_module); |
| 329 | #ifndef NO_IPV6 |
| 330 | if (wship6_module) |
| 331 | FreeLibrary(wship6_module); |
| 332 | #endif |
| 333 | } |
| 334 | |
| 335 | struct errstring { |
| 336 | int error; |
| 337 | char *text; |
| 338 | }; |
| 339 | |
| 340 | static int errstring_find(void *av, void *bv) |
| 341 | { |
| 342 | int *a = (int *)av; |
| 343 | struct errstring *b = (struct errstring *)bv; |
| 344 | if (*a < b->error) |
| 345 | return -1; |
| 346 | if (*a > b->error) |
| 347 | return +1; |
| 348 | return 0; |
| 349 | } |
| 350 | static int errstring_compare(void *av, void *bv) |
| 351 | { |
| 352 | struct errstring *a = (struct errstring *)av; |
| 353 | return errstring_find(&a->error, bv); |
| 354 | } |
| 355 | |
| 356 | static tree234 *errstrings = NULL; |
| 357 | |
| 358 | char *winsock_error_string(int error) |
| 359 | { |
| 360 | const char prefix[] = "Network error: "; |
| 361 | struct errstring *es; |
| 362 | |
| 363 | /* |
| 364 | * Error codes we know about and have historically had reasonably |
| 365 | * sensible error messages for. |
| 366 | */ |
| 367 | switch (error) { |
| 368 | case WSAEACCES: |
| 369 | return "Network error: Permission denied"; |
| 370 | case WSAEADDRINUSE: |
| 371 | return "Network error: Address already in use"; |
| 372 | case WSAEADDRNOTAVAIL: |
| 373 | return "Network error: Cannot assign requested address"; |
| 374 | case WSAEAFNOSUPPORT: |
| 375 | return |
| 376 | "Network error: Address family not supported by protocol family"; |
| 377 | case WSAEALREADY: |
| 378 | return "Network error: Operation already in progress"; |
| 379 | case WSAECONNABORTED: |
| 380 | return "Network error: Software caused connection abort"; |
| 381 | case WSAECONNREFUSED: |
| 382 | return "Network error: Connection refused"; |
| 383 | case WSAECONNRESET: |
| 384 | return "Network error: Connection reset by peer"; |
| 385 | case WSAEDESTADDRREQ: |
| 386 | return "Network error: Destination address required"; |
| 387 | case WSAEFAULT: |
| 388 | return "Network error: Bad address"; |
| 389 | case WSAEHOSTDOWN: |
| 390 | return "Network error: Host is down"; |
| 391 | case WSAEHOSTUNREACH: |
| 392 | return "Network error: No route to host"; |
| 393 | case WSAEINPROGRESS: |
| 394 | return "Network error: Operation now in progress"; |
| 395 | case WSAEINTR: |
| 396 | return "Network error: Interrupted function call"; |
| 397 | case WSAEINVAL: |
| 398 | return "Network error: Invalid argument"; |
| 399 | case WSAEISCONN: |
| 400 | return "Network error: Socket is already connected"; |
| 401 | case WSAEMFILE: |
| 402 | return "Network error: Too many open files"; |
| 403 | case WSAEMSGSIZE: |
| 404 | return "Network error: Message too long"; |
| 405 | case WSAENETDOWN: |
| 406 | return "Network error: Network is down"; |
| 407 | case WSAENETRESET: |
| 408 | return "Network error: Network dropped connection on reset"; |
| 409 | case WSAENETUNREACH: |
| 410 | return "Network error: Network is unreachable"; |
| 411 | case WSAENOBUFS: |
| 412 | return "Network error: No buffer space available"; |
| 413 | case WSAENOPROTOOPT: |
| 414 | return "Network error: Bad protocol option"; |
| 415 | case WSAENOTCONN: |
| 416 | return "Network error: Socket is not connected"; |
| 417 | case WSAENOTSOCK: |
| 418 | return "Network error: Socket operation on non-socket"; |
| 419 | case WSAEOPNOTSUPP: |
| 420 | return "Network error: Operation not supported"; |
| 421 | case WSAEPFNOSUPPORT: |
| 422 | return "Network error: Protocol family not supported"; |
| 423 | case WSAEPROCLIM: |
| 424 | return "Network error: Too many processes"; |
| 425 | case WSAEPROTONOSUPPORT: |
| 426 | return "Network error: Protocol not supported"; |
| 427 | case WSAEPROTOTYPE: |
| 428 | return "Network error: Protocol wrong type for socket"; |
| 429 | case WSAESHUTDOWN: |
| 430 | return "Network error: Cannot send after socket shutdown"; |
| 431 | case WSAESOCKTNOSUPPORT: |
| 432 | return "Network error: Socket type not supported"; |
| 433 | case WSAETIMEDOUT: |
| 434 | return "Network error: Connection timed out"; |
| 435 | case WSAEWOULDBLOCK: |
| 436 | return "Network error: Resource temporarily unavailable"; |
| 437 | case WSAEDISCON: |
| 438 | return "Network error: Graceful shutdown in progress"; |
| 439 | } |
| 440 | |
| 441 | /* |
| 442 | * Generic code to handle any other error. |
| 443 | * |
| 444 | * Slightly nasty hack here: we want to return a static string |
| 445 | * which the caller will never have to worry about freeing, but on |
| 446 | * the other hand if we call FormatMessage to get it then it will |
| 447 | * want to either allocate a buffer or write into one we own. |
| 448 | * |
| 449 | * So what we do is to maintain a tree234 of error strings we've |
| 450 | * already used. New ones are allocated from the heap, but then |
| 451 | * put in this tree and kept forever. |
| 452 | */ |
| 453 | |
| 454 | if (!errstrings) |
| 455 | errstrings = newtree234(errstring_compare); |
| 456 | |
| 457 | es = find234(errstrings, &error, errstring_find); |
| 458 | |
| 459 | if (!es) { |
| 460 | int bufsize, bufused; |
| 461 | |
| 462 | es = snew(struct errstring); |
| 463 | es->error = error; |
| 464 | /* maximum size for FormatMessage is 64K */ |
| 465 | bufsize = 65535 + sizeof(prefix); |
| 466 | es->text = snewn(bufsize, char); |
| 467 | strcpy(es->text, prefix); |
| 468 | bufused = strlen(es->text); |
| 469 | if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM | |
| 470 | FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error, |
| 471 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
| 472 | es->text + bufused, bufsize - bufused, NULL)) { |
| 473 | sprintf(es->text + bufused, |
| 474 | "Windows error code %d (and FormatMessage returned %d)", |
| 475 | error, GetLastError()); |
| 476 | } else { |
| 477 | int len = strlen(es->text); |
| 478 | if (len > 0 && es->text[len-1] == '\n') |
| 479 | es->text[len-1] = '\0'; |
| 480 | } |
| 481 | es->text = sresize(es->text, strlen(es->text) + 1, char); |
| 482 | add234(errstrings, es); |
| 483 | } |
| 484 | |
| 485 | return es->text; |
| 486 | } |
| 487 | |
| 488 | SockAddr sk_namelookup(const char *host, char **canonicalname, |
| 489 | int address_family) |
| 490 | { |
| 491 | SockAddr ret = snew(struct SockAddr_tag); |
| 492 | unsigned long a; |
| 493 | char realhost[8192]; |
| 494 | int hint_family; |
| 495 | |
| 496 | /* Default to IPv4. */ |
| 497 | hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
| 498 | #ifndef NO_IPV6 |
| 499 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
| 500 | #endif |
| 501 | AF_UNSPEC); |
| 502 | |
| 503 | /* Clear the structure and default to IPv4. */ |
| 504 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 505 | #ifndef NO_IPV6 |
| 506 | ret->ais = NULL; |
| 507 | #endif |
| 508 | ret->addresses = NULL; |
| 509 | ret->resolved = FALSE; |
| 510 | ret->refcount = 1; |
| 511 | *realhost = '\0'; |
| 512 | |
| 513 | if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) { |
| 514 | struct hostent *h = NULL; |
| 515 | int err; |
| 516 | #ifndef NO_IPV6 |
| 517 | /* |
| 518 | * Use getaddrinfo when it's available |
| 519 | */ |
| 520 | if (p_getaddrinfo) { |
| 521 | struct addrinfo hints; |
| 522 | #ifdef NET_SETUP_DIAGNOSTICS |
| 523 | logevent(NULL, "Using getaddrinfo() for resolving"); |
| 524 | #endif |
| 525 | memset(&hints, 0, sizeof(hints)); |
| 526 | hints.ai_family = hint_family; |
| 527 | hints.ai_flags = AI_CANONNAME; |
| 528 | if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0) |
| 529 | ret->resolved = TRUE; |
| 530 | } else |
| 531 | #endif |
| 532 | { |
| 533 | #ifdef NET_SETUP_DIAGNOSTICS |
| 534 | logevent(NULL, "Using gethostbyname() for resolving"); |
| 535 | #endif |
| 536 | /* |
| 537 | * Otherwise use the IPv4-only gethostbyname... |
| 538 | * (NOTE: we don't use gethostbyname as a fallback!) |
| 539 | */ |
| 540 | if ( (h = p_gethostbyname(host)) ) |
| 541 | ret->resolved = TRUE; |
| 542 | else |
| 543 | err = p_WSAGetLastError(); |
| 544 | } |
| 545 | |
| 546 | if (!ret->resolved) { |
| 547 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
| 548 | err == WSAHOST_NOT_FOUND ? "Host does not exist" : |
| 549 | err == WSATRY_AGAIN ? "Host not found" : |
| 550 | #ifndef NO_IPV6 |
| 551 | p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) : |
| 552 | #endif |
| 553 | "gethostbyname: unknown error"); |
| 554 | } else { |
| 555 | ret->error = NULL; |
| 556 | |
| 557 | #ifndef NO_IPV6 |
| 558 | /* If we got an address info use that... */ |
| 559 | if (ret->ais) { |
| 560 | /* Are we in IPv4 fallback mode? */ |
| 561 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
| 562 | if (ret->ais->ai_family == AF_INET) |
| 563 | memcpy(&a, |
| 564 | (char *) &((SOCKADDR_IN *) ret->ais-> |
| 565 | ai_addr)->sin_addr, sizeof(a)); |
| 566 | |
| 567 | if (ret->ais->ai_canonname) |
| 568 | strncpy(realhost, ret->ais->ai_canonname, lenof(realhost)); |
| 569 | else |
| 570 | strncpy(realhost, host, lenof(realhost)); |
| 571 | } |
| 572 | /* We used the IPv4-only gethostbyname()... */ |
| 573 | else |
| 574 | #endif |
| 575 | { |
| 576 | int n; |
| 577 | for (n = 0; h->h_addr_list[n]; n++); |
| 578 | ret->addresses = snewn(n, unsigned long); |
| 579 | ret->naddresses = n; |
| 580 | for (n = 0; n < ret->naddresses; n++) { |
| 581 | memcpy(&a, h->h_addr_list[n], sizeof(a)); |
| 582 | ret->addresses[n] = p_ntohl(a); |
| 583 | } |
| 584 | memcpy(&a, h->h_addr, sizeof(a)); |
| 585 | /* This way we are always sure the h->h_name is valid :) */ |
| 586 | strncpy(realhost, h->h_name, sizeof(realhost)); |
| 587 | } |
| 588 | } |
| 589 | } else { |
| 590 | /* |
| 591 | * This must be a numeric IPv4 address because it caused a |
| 592 | * success return from inet_addr. |
| 593 | */ |
| 594 | ret->addresses = snewn(1, unsigned long); |
| 595 | ret->naddresses = 1; |
| 596 | ret->addresses[0] = p_ntohl(a); |
| 597 | ret->resolved = TRUE; |
| 598 | strncpy(realhost, host, sizeof(realhost)); |
| 599 | } |
| 600 | realhost[lenof(realhost)-1] = '\0'; |
| 601 | *canonicalname = snewn(1+strlen(realhost), char); |
| 602 | strcpy(*canonicalname, realhost); |
| 603 | return ret; |
| 604 | } |
| 605 | |
| 606 | SockAddr sk_nonamelookup(const char *host) |
| 607 | { |
| 608 | SockAddr ret = snew(struct SockAddr_tag); |
| 609 | ret->error = NULL; |
| 610 | ret->resolved = FALSE; |
| 611 | #ifndef NO_IPV6 |
| 612 | ret->ais = NULL; |
| 613 | #endif |
| 614 | ret->addresses = NULL; |
| 615 | ret->naddresses = 0; |
| 616 | ret->refcount = 1; |
| 617 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
| 618 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
| 619 | return ret; |
| 620 | } |
| 621 | |
| 622 | int sk_nextaddr(SockAddr addr, SockAddrStep *step) |
| 623 | { |
| 624 | #ifndef NO_IPV6 |
| 625 | if (step->ai) { |
| 626 | if (step->ai->ai_next) { |
| 627 | step->ai = step->ai->ai_next; |
| 628 | return TRUE; |
| 629 | } else |
| 630 | return FALSE; |
| 631 | } |
| 632 | #endif |
| 633 | if (step->curraddr+1 < addr->naddresses) { |
| 634 | step->curraddr++; |
| 635 | return TRUE; |
| 636 | } else { |
| 637 | return FALSE; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
| 642 | { |
| 643 | SockAddrStep step; |
| 644 | START_STEP(addr, step); |
| 645 | |
| 646 | #ifndef NO_IPV6 |
| 647 | if (step.ai) { |
| 648 | int err = 0; |
| 649 | if (p_WSAAddressToStringA) { |
| 650 | DWORD dwbuflen = buflen; |
| 651 | err = p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen, |
| 652 | NULL, buf, &dwbuflen); |
| 653 | } else |
| 654 | err = -1; |
| 655 | if (err) { |
| 656 | strncpy(buf, addr->hostname, buflen); |
| 657 | if (!buf[0]) |
| 658 | strncpy(buf, "<unknown>", buflen); |
| 659 | buf[buflen-1] = '\0'; |
| 660 | } |
| 661 | } else |
| 662 | #endif |
| 663 | if (SOCKADDR_FAMILY(addr, step) == AF_INET) { |
| 664 | struct in_addr a; |
| 665 | assert(addr->addresses && step.curraddr < addr->naddresses); |
| 666 | a.s_addr = p_htonl(addr->addresses[step.curraddr]); |
| 667 | strncpy(buf, p_inet_ntoa(a), buflen); |
| 668 | buf[buflen-1] = '\0'; |
| 669 | } else { |
| 670 | strncpy(buf, addr->hostname, buflen); |
| 671 | buf[buflen-1] = '\0'; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | int sk_hostname_is_local(char *name) |
| 676 | { |
| 677 | return !strcmp(name, "localhost") || |
| 678 | !strcmp(name, "::1") || |
| 679 | !strncmp(name, "127.", 4); |
| 680 | } |
| 681 | |
| 682 | static INTERFACE_INFO local_interfaces[16]; |
| 683 | static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */ |
| 684 | |
| 685 | static int ipv4_is_local_addr(struct in_addr addr) |
| 686 | { |
| 687 | if (ipv4_is_loopback(addr)) |
| 688 | return 1; /* loopback addresses are local */ |
| 689 | if (!n_local_interfaces) { |
| 690 | SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0); |
| 691 | DWORD retbytes; |
| 692 | |
| 693 | if (p_WSAIoctl && |
| 694 | p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, |
| 695 | local_interfaces, sizeof(local_interfaces), |
| 696 | &retbytes, NULL, NULL) == 0) |
| 697 | n_local_interfaces = retbytes / sizeof(INTERFACE_INFO); |
| 698 | else |
| 699 | logevent(NULL, "Unable to get list of local IP addresses"); |
| 700 | } |
| 701 | if (n_local_interfaces > 0) { |
| 702 | int i; |
| 703 | for (i = 0; i < n_local_interfaces; i++) { |
| 704 | SOCKADDR_IN *address = |
| 705 | (SOCKADDR_IN *)&local_interfaces[i].iiAddress; |
| 706 | if (address->sin_addr.s_addr == addr.s_addr) |
| 707 | return 1; /* this address is local */ |
| 708 | } |
| 709 | } |
| 710 | return 0; /* this address is not local */ |
| 711 | } |
| 712 | |
| 713 | int sk_address_is_local(SockAddr addr) |
| 714 | { |
| 715 | SockAddrStep step; |
| 716 | int family; |
| 717 | START_STEP(addr, step); |
| 718 | family = SOCKADDR_FAMILY(addr, step); |
| 719 | |
| 720 | #ifndef NO_IPV6 |
| 721 | if (family == AF_INET6) { |
| 722 | return IN6_IS_ADDR_LOOPBACK(&((const struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr); |
| 723 | } else |
| 724 | #endif |
| 725 | if (family == AF_INET) { |
| 726 | #ifndef NO_IPV6 |
| 727 | if (step.ai) { |
| 728 | return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr) |
| 729 | ->sin_addr); |
| 730 | } else |
| 731 | #endif |
| 732 | { |
| 733 | struct in_addr a; |
| 734 | assert(addr->addresses && step.curraddr < addr->naddresses); |
| 735 | a.s_addr = p_htonl(addr->addresses[step.curraddr]); |
| 736 | return ipv4_is_local_addr(a); |
| 737 | } |
| 738 | } else { |
| 739 | assert(family == AF_UNSPEC); |
| 740 | return 0; /* we don't know; assume not */ |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | int sk_address_is_special_local(SockAddr addr) |
| 745 | { |
| 746 | return 0; /* no Unix-domain socket analogue here */ |
| 747 | } |
| 748 | |
| 749 | int sk_addrtype(SockAddr addr) |
| 750 | { |
| 751 | SockAddrStep step; |
| 752 | int family; |
| 753 | START_STEP(addr, step); |
| 754 | family = SOCKADDR_FAMILY(addr, step); |
| 755 | |
| 756 | return (family == AF_INET ? ADDRTYPE_IPV4 : |
| 757 | #ifndef NO_IPV6 |
| 758 | family == AF_INET6 ? ADDRTYPE_IPV6 : |
| 759 | #endif |
| 760 | ADDRTYPE_NAME); |
| 761 | } |
| 762 | |
| 763 | void sk_addrcopy(SockAddr addr, char *buf) |
| 764 | { |
| 765 | SockAddrStep step; |
| 766 | int family; |
| 767 | START_STEP(addr, step); |
| 768 | family = SOCKADDR_FAMILY(addr, step); |
| 769 | |
| 770 | assert(family != AF_UNSPEC); |
| 771 | #ifndef NO_IPV6 |
| 772 | if (step.ai) { |
| 773 | if (family == AF_INET) |
| 774 | memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr, |
| 775 | sizeof(struct in_addr)); |
| 776 | else if (family == AF_INET6) |
| 777 | memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr, |
| 778 | sizeof(struct in6_addr)); |
| 779 | else |
| 780 | assert(FALSE); |
| 781 | } else |
| 782 | #endif |
| 783 | if (family == AF_INET) { |
| 784 | struct in_addr a; |
| 785 | assert(addr->addresses && step.curraddr < addr->naddresses); |
| 786 | a.s_addr = p_htonl(addr->addresses[step.curraddr]); |
| 787 | memcpy(buf, (char*) &a.s_addr, 4); |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | void sk_addr_free(SockAddr addr) |
| 792 | { |
| 793 | if (--addr->refcount > 0) |
| 794 | return; |
| 795 | #ifndef NO_IPV6 |
| 796 | if (addr->ais && p_freeaddrinfo) |
| 797 | p_freeaddrinfo(addr->ais); |
| 798 | #endif |
| 799 | if (addr->addresses) |
| 800 | sfree(addr->addresses); |
| 801 | sfree(addr); |
| 802 | } |
| 803 | |
| 804 | SockAddr sk_addr_dup(SockAddr addr) |
| 805 | { |
| 806 | addr->refcount++; |
| 807 | return addr; |
| 808 | } |
| 809 | |
| 810 | static Plug sk_tcp_plug(Socket sock, Plug p) |
| 811 | { |
| 812 | Actual_Socket s = (Actual_Socket) sock; |
| 813 | Plug ret = s->plug; |
| 814 | if (p) |
| 815 | s->plug = p; |
| 816 | return ret; |
| 817 | } |
| 818 | |
| 819 | static void sk_tcp_flush(Socket s) |
| 820 | { |
| 821 | /* |
| 822 | * We send data to the socket as soon as we can anyway, |
| 823 | * so we don't need to do anything here. :-) |
| 824 | */ |
| 825 | } |
| 826 | |
| 827 | static void sk_tcp_close(Socket s); |
| 828 | static int sk_tcp_write(Socket s, const char *data, int len); |
| 829 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
| 830 | static void sk_tcp_write_eof(Socket s); |
| 831 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
| 832 | static void *sk_tcp_get_private_ptr(Socket s); |
| 833 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
| 834 | static const char *sk_tcp_socket_error(Socket s); |
| 835 | |
| 836 | extern char *do_select(SOCKET skt, int startup); |
| 837 | |
| 838 | Socket sk_register(void *sock, Plug plug) |
| 839 | { |
| 840 | static const struct socket_function_table fn_table = { |
| 841 | sk_tcp_plug, |
| 842 | sk_tcp_close, |
| 843 | sk_tcp_write, |
| 844 | sk_tcp_write_oob, |
| 845 | sk_tcp_write_eof, |
| 846 | sk_tcp_flush, |
| 847 | sk_tcp_set_private_ptr, |
| 848 | sk_tcp_get_private_ptr, |
| 849 | sk_tcp_set_frozen, |
| 850 | sk_tcp_socket_error |
| 851 | }; |
| 852 | |
| 853 | DWORD err; |
| 854 | char *errstr; |
| 855 | Actual_Socket ret; |
| 856 | |
| 857 | /* |
| 858 | * Create Socket structure. |
| 859 | */ |
| 860 | ret = snew(struct Socket_tag); |
| 861 | ret->fn = &fn_table; |
| 862 | ret->error = NULL; |
| 863 | ret->plug = plug; |
| 864 | bufchain_init(&ret->output_data); |
| 865 | ret->writable = 1; /* to start with */ |
| 866 | ret->sending_oob = 0; |
| 867 | ret->outgoingeof = EOF_NO; |
| 868 | ret->frozen = 1; |
| 869 | ret->frozen_readable = 0; |
| 870 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 871 | ret->pending_error = 0; |
| 872 | ret->parent = ret->child = NULL; |
| 873 | ret->addr = NULL; |
| 874 | |
| 875 | ret->s = (SOCKET)sock; |
| 876 | |
| 877 | if (ret->s == INVALID_SOCKET) { |
| 878 | err = p_WSAGetLastError(); |
| 879 | ret->error = winsock_error_string(err); |
| 880 | return (Socket) ret; |
| 881 | } |
| 882 | |
| 883 | ret->oobinline = 0; |
| 884 | |
| 885 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 886 | * window, or an EventSelect on an event object. */ |
| 887 | errstr = do_select(ret->s, 1); |
| 888 | if (errstr) { |
| 889 | ret->error = errstr; |
| 890 | return (Socket) ret; |
| 891 | } |
| 892 | |
| 893 | add234(sktree, ret); |
| 894 | |
| 895 | return (Socket) ret; |
| 896 | } |
| 897 | |
| 898 | static DWORD try_connect(Actual_Socket sock) |
| 899 | { |
| 900 | SOCKET s; |
| 901 | #ifndef NO_IPV6 |
| 902 | SOCKADDR_IN6 a6; |
| 903 | #endif |
| 904 | SOCKADDR_IN a; |
| 905 | DWORD err; |
| 906 | char *errstr; |
| 907 | short localport; |
| 908 | int family; |
| 909 | |
| 910 | if (sock->s != INVALID_SOCKET) { |
| 911 | do_select(sock->s, 0); |
| 912 | p_closesocket(sock->s); |
| 913 | } |
| 914 | |
| 915 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); |
| 916 | |
| 917 | /* |
| 918 | * Open socket. |
| 919 | */ |
| 920 | family = SOCKADDR_FAMILY(sock->addr, sock->step); |
| 921 | |
| 922 | /* |
| 923 | * Remove the socket from the tree before we overwrite its |
| 924 | * internal socket id, because that forms part of the tree's |
| 925 | * sorting criterion. We'll add it back before exiting this |
| 926 | * function, whether we changed anything or not. |
| 927 | */ |
| 928 | del234(sktree, sock); |
| 929 | |
| 930 | s = p_socket(family, SOCK_STREAM, 0); |
| 931 | sock->s = s; |
| 932 | |
| 933 | if (s == INVALID_SOCKET) { |
| 934 | err = p_WSAGetLastError(); |
| 935 | sock->error = winsock_error_string(err); |
| 936 | goto ret; |
| 937 | } |
| 938 | |
| 939 | if (sock->oobinline) { |
| 940 | BOOL b = TRUE; |
| 941 | p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
| 942 | } |
| 943 | |
| 944 | if (sock->nodelay) { |
| 945 | BOOL b = TRUE; |
| 946 | p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
| 947 | } |
| 948 | |
| 949 | if (sock->keepalive) { |
| 950 | BOOL b = TRUE; |
| 951 | p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | * Bind to local address. |
| 956 | */ |
| 957 | if (sock->privport) |
| 958 | localport = 1023; /* count from 1023 downwards */ |
| 959 | else |
| 960 | localport = 0; /* just use port 0 (ie winsock picks) */ |
| 961 | |
| 962 | /* Loop round trying to bind */ |
| 963 | while (1) { |
| 964 | int sockcode; |
| 965 | |
| 966 | #ifndef NO_IPV6 |
| 967 | if (family == AF_INET6) { |
| 968 | memset(&a6, 0, sizeof(a6)); |
| 969 | a6.sin6_family = AF_INET6; |
| 970 | /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */ |
| 971 | a6.sin6_port = p_htons(localport); |
| 972 | } else |
| 973 | #endif |
| 974 | { |
| 975 | a.sin_family = AF_INET; |
| 976 | a.sin_addr.s_addr = p_htonl(INADDR_ANY); |
| 977 | a.sin_port = p_htons(localport); |
| 978 | } |
| 979 | #ifndef NO_IPV6 |
| 980 | sockcode = p_bind(s, (family == AF_INET6 ? |
| 981 | (struct sockaddr *) &a6 : |
| 982 | (struct sockaddr *) &a), |
| 983 | (family == AF_INET6 ? sizeof(a6) : sizeof(a))); |
| 984 | #else |
| 985 | sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 986 | #endif |
| 987 | if (sockcode != SOCKET_ERROR) { |
| 988 | err = 0; |
| 989 | break; /* done */ |
| 990 | } else { |
| 991 | err = p_WSAGetLastError(); |
| 992 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
| 993 | break; |
| 994 | } |
| 995 | |
| 996 | if (localport == 0) |
| 997 | break; /* we're only looping once */ |
| 998 | localport--; |
| 999 | if (localport == 0) |
| 1000 | break; /* we might have got to the end */ |
| 1001 | } |
| 1002 | |
| 1003 | if (err) { |
| 1004 | sock->error = winsock_error_string(err); |
| 1005 | goto ret; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * Connect to remote address. |
| 1010 | */ |
| 1011 | #ifndef NO_IPV6 |
| 1012 | if (sock->step.ai) { |
| 1013 | if (family == AF_INET6) { |
| 1014 | a6.sin6_family = AF_INET6; |
| 1015 | a6.sin6_port = p_htons((short) sock->port); |
| 1016 | a6.sin6_addr = |
| 1017 | ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr; |
| 1018 | a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo; |
| 1019 | a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id; |
| 1020 | } else { |
| 1021 | a.sin_family = AF_INET; |
| 1022 | a.sin_addr = |
| 1023 | ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr; |
| 1024 | a.sin_port = p_htons((short) sock->port); |
| 1025 | } |
| 1026 | } else |
| 1027 | #endif |
| 1028 | { |
| 1029 | assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses); |
| 1030 | a.sin_family = AF_INET; |
| 1031 | a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]); |
| 1032 | a.sin_port = p_htons((short) sock->port); |
| 1033 | } |
| 1034 | |
| 1035 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 1036 | * window, or an EventSelect on an event object. */ |
| 1037 | errstr = do_select(s, 1); |
| 1038 | if (errstr) { |
| 1039 | sock->error = errstr; |
| 1040 | err = 1; |
| 1041 | goto ret; |
| 1042 | } |
| 1043 | |
| 1044 | if (( |
| 1045 | #ifndef NO_IPV6 |
| 1046 | p_connect(s, |
| 1047 | ((family == AF_INET6) ? (struct sockaddr *) &a6 : |
| 1048 | (struct sockaddr *) &a), |
| 1049 | (family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
| 1050 | #else |
| 1051 | p_connect(s, (struct sockaddr *) &a, sizeof(a)) |
| 1052 | #endif |
| 1053 | ) == SOCKET_ERROR) { |
| 1054 | err = p_WSAGetLastError(); |
| 1055 | /* |
| 1056 | * We expect a potential EWOULDBLOCK here, because the |
| 1057 | * chances are the front end has done a select for |
| 1058 | * FD_CONNECT, so that connect() will complete |
| 1059 | * asynchronously. |
| 1060 | */ |
| 1061 | if ( err != WSAEWOULDBLOCK ) { |
| 1062 | sock->error = winsock_error_string(err); |
| 1063 | goto ret; |
| 1064 | } |
| 1065 | } else { |
| 1066 | /* |
| 1067 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
| 1068 | * and we should set the socket as writable. |
| 1069 | */ |
| 1070 | sock->writable = 1; |
| 1071 | } |
| 1072 | |
| 1073 | err = 0; |
| 1074 | |
| 1075 | ret: |
| 1076 | |
| 1077 | /* |
| 1078 | * No matter what happened, put the socket back in the tree. |
| 1079 | */ |
| 1080 | add234(sktree, sock); |
| 1081 | |
| 1082 | if (err) |
| 1083 | plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err); |
| 1084 | return err; |
| 1085 | } |
| 1086 | |
| 1087 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
| 1088 | int nodelay, int keepalive, Plug plug) |
| 1089 | { |
| 1090 | static const struct socket_function_table fn_table = { |
| 1091 | sk_tcp_plug, |
| 1092 | sk_tcp_close, |
| 1093 | sk_tcp_write, |
| 1094 | sk_tcp_write_oob, |
| 1095 | sk_tcp_write_eof, |
| 1096 | sk_tcp_flush, |
| 1097 | sk_tcp_set_private_ptr, |
| 1098 | sk_tcp_get_private_ptr, |
| 1099 | sk_tcp_set_frozen, |
| 1100 | sk_tcp_socket_error |
| 1101 | }; |
| 1102 | |
| 1103 | Actual_Socket ret; |
| 1104 | DWORD err; |
| 1105 | |
| 1106 | /* |
| 1107 | * Create Socket structure. |
| 1108 | */ |
| 1109 | ret = snew(struct Socket_tag); |
| 1110 | ret->fn = &fn_table; |
| 1111 | ret->error = NULL; |
| 1112 | ret->plug = plug; |
| 1113 | bufchain_init(&ret->output_data); |
| 1114 | ret->connected = 0; /* to start with */ |
| 1115 | ret->writable = 0; /* to start with */ |
| 1116 | ret->sending_oob = 0; |
| 1117 | ret->outgoingeof = EOF_NO; |
| 1118 | ret->frozen = 0; |
| 1119 | ret->frozen_readable = 0; |
| 1120 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 1121 | ret->pending_error = 0; |
| 1122 | ret->parent = ret->child = NULL; |
| 1123 | ret->oobinline = oobinline; |
| 1124 | ret->nodelay = nodelay; |
| 1125 | ret->keepalive = keepalive; |
| 1126 | ret->privport = privport; |
| 1127 | ret->port = port; |
| 1128 | ret->addr = addr; |
| 1129 | START_STEP(ret->addr, ret->step); |
| 1130 | ret->s = INVALID_SOCKET; |
| 1131 | |
| 1132 | err = 0; |
| 1133 | do { |
| 1134 | err = try_connect(ret); |
| 1135 | } while (err && sk_nextaddr(ret->addr, &ret->step)); |
| 1136 | |
| 1137 | return (Socket) ret; |
| 1138 | } |
| 1139 | |
| 1140 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, |
| 1141 | int orig_address_family) |
| 1142 | { |
| 1143 | static const struct socket_function_table fn_table = { |
| 1144 | sk_tcp_plug, |
| 1145 | sk_tcp_close, |
| 1146 | sk_tcp_write, |
| 1147 | sk_tcp_write_oob, |
| 1148 | sk_tcp_write_eof, |
| 1149 | sk_tcp_flush, |
| 1150 | sk_tcp_set_private_ptr, |
| 1151 | sk_tcp_get_private_ptr, |
| 1152 | sk_tcp_set_frozen, |
| 1153 | sk_tcp_socket_error |
| 1154 | }; |
| 1155 | |
| 1156 | SOCKET s; |
| 1157 | #ifndef NO_IPV6 |
| 1158 | SOCKADDR_IN6 a6; |
| 1159 | #endif |
| 1160 | SOCKADDR_IN a; |
| 1161 | |
| 1162 | DWORD err; |
| 1163 | char *errstr; |
| 1164 | Actual_Socket ret; |
| 1165 | int retcode; |
| 1166 | int on = 1; |
| 1167 | |
| 1168 | int address_family; |
| 1169 | |
| 1170 | /* |
| 1171 | * Create Socket structure. |
| 1172 | */ |
| 1173 | ret = snew(struct Socket_tag); |
| 1174 | ret->fn = &fn_table; |
| 1175 | ret->error = NULL; |
| 1176 | ret->plug = plug; |
| 1177 | bufchain_init(&ret->output_data); |
| 1178 | ret->writable = 0; /* to start with */ |
| 1179 | ret->sending_oob = 0; |
| 1180 | ret->outgoingeof = EOF_NO; |
| 1181 | ret->frozen = 0; |
| 1182 | ret->frozen_readable = 0; |
| 1183 | ret->localhost_only = local_host_only; |
| 1184 | ret->pending_error = 0; |
| 1185 | ret->parent = ret->child = NULL; |
| 1186 | ret->addr = NULL; |
| 1187 | |
| 1188 | /* |
| 1189 | * Translate address_family from platform-independent constants |
| 1190 | * into local reality. |
| 1191 | */ |
| 1192 | address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET : |
| 1193 | #ifndef NO_IPV6 |
| 1194 | orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
| 1195 | #endif |
| 1196 | AF_UNSPEC); |
| 1197 | |
| 1198 | /* |
| 1199 | * Our default, if passed the `don't care' value |
| 1200 | * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported, |
| 1201 | * we will also set up a second socket listening on IPv6, but |
| 1202 | * the v4 one is primary since that ought to work even on |
| 1203 | * non-v6-supporting systems. |
| 1204 | */ |
| 1205 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
| 1206 | |
| 1207 | /* |
| 1208 | * Open socket. |
| 1209 | */ |
| 1210 | s = p_socket(address_family, SOCK_STREAM, 0); |
| 1211 | ret->s = s; |
| 1212 | |
| 1213 | if (s == INVALID_SOCKET) { |
| 1214 | err = p_WSAGetLastError(); |
| 1215 | ret->error = winsock_error_string(err); |
| 1216 | return (Socket) ret; |
| 1217 | } |
| 1218 | |
| 1219 | ret->oobinline = 0; |
| 1220 | |
| 1221 | p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
| 1222 | |
| 1223 | #ifndef NO_IPV6 |
| 1224 | if (address_family == AF_INET6) { |
| 1225 | memset(&a6, 0, sizeof(a6)); |
| 1226 | a6.sin6_family = AF_INET6; |
| 1227 | /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't |
| 1228 | * know how to do it. :-) |
| 1229 | * (jeroen:) saddr is specified as an address.. eg 2001:db8::1 |
| 1230 | * Thus we need either a parser that understands [2001:db8::1]:80 |
| 1231 | * style addresses and/or enhance this to understand hostnames too. */ |
| 1232 | if (local_host_only) |
| 1233 | a6.sin6_addr = in6addr_loopback; |
| 1234 | else |
| 1235 | a6.sin6_addr = in6addr_any; |
| 1236 | a6.sin6_port = p_htons(port); |
| 1237 | } else |
| 1238 | #endif |
| 1239 | { |
| 1240 | int got_addr = 0; |
| 1241 | a.sin_family = AF_INET; |
| 1242 | |
| 1243 | /* |
| 1244 | * Bind to source address. First try an explicitly |
| 1245 | * specified one... |
| 1246 | */ |
| 1247 | if (srcaddr) { |
| 1248 | a.sin_addr.s_addr = p_inet_addr(srcaddr); |
| 1249 | if (a.sin_addr.s_addr != INADDR_NONE) { |
| 1250 | /* Override localhost_only with specified listen addr. */ |
| 1251 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
| 1252 | got_addr = 1; |
| 1253 | } |
| 1254 | } |
| 1255 | |
| 1256 | /* |
| 1257 | * ... and failing that, go with one of the standard ones. |
| 1258 | */ |
| 1259 | if (!got_addr) { |
| 1260 | if (local_host_only) |
| 1261 | a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK); |
| 1262 | else |
| 1263 | a.sin_addr.s_addr = p_htonl(INADDR_ANY); |
| 1264 | } |
| 1265 | |
| 1266 | a.sin_port = p_htons((short)port); |
| 1267 | } |
| 1268 | #ifndef NO_IPV6 |
| 1269 | retcode = p_bind(s, (address_family == AF_INET6 ? |
| 1270 | (struct sockaddr *) &a6 : |
| 1271 | (struct sockaddr *) &a), |
| 1272 | (address_family == |
| 1273 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
| 1274 | #else |
| 1275 | retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 1276 | #endif |
| 1277 | if (retcode != SOCKET_ERROR) { |
| 1278 | err = 0; |
| 1279 | } else { |
| 1280 | err = p_WSAGetLastError(); |
| 1281 | } |
| 1282 | |
| 1283 | if (err) { |
| 1284 | p_closesocket(s); |
| 1285 | ret->error = winsock_error_string(err); |
| 1286 | return (Socket) ret; |
| 1287 | } |
| 1288 | |
| 1289 | |
| 1290 | if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) { |
| 1291 | p_closesocket(s); |
| 1292 | ret->error = winsock_error_string(p_WSAGetLastError()); |
| 1293 | return (Socket) ret; |
| 1294 | } |
| 1295 | |
| 1296 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 1297 | * window, or an EventSelect on an event object. */ |
| 1298 | errstr = do_select(s, 1); |
| 1299 | if (errstr) { |
| 1300 | p_closesocket(s); |
| 1301 | ret->error = errstr; |
| 1302 | return (Socket) ret; |
| 1303 | } |
| 1304 | |
| 1305 | add234(sktree, ret); |
| 1306 | |
| 1307 | #ifndef NO_IPV6 |
| 1308 | /* |
| 1309 | * If we were given ADDRTYPE_UNSPEC, we must also create an |
| 1310 | * IPv6 listening socket and link it to this one. |
| 1311 | */ |
| 1312 | if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) { |
| 1313 | Actual_Socket other; |
| 1314 | |
| 1315 | other = (Actual_Socket) sk_newlistener(srcaddr, port, plug, |
| 1316 | local_host_only, ADDRTYPE_IPV6); |
| 1317 | |
| 1318 | if (other) { |
| 1319 | if (!other->error) { |
| 1320 | other->parent = ret; |
| 1321 | ret->child = other; |
| 1322 | } else { |
| 1323 | sfree(other); |
| 1324 | } |
| 1325 | } |
| 1326 | } |
| 1327 | #endif |
| 1328 | |
| 1329 | return (Socket) ret; |
| 1330 | } |
| 1331 | |
| 1332 | static void sk_tcp_close(Socket sock) |
| 1333 | { |
| 1334 | extern char *do_select(SOCKET skt, int startup); |
| 1335 | Actual_Socket s = (Actual_Socket) sock; |
| 1336 | |
| 1337 | if (s->child) |
| 1338 | sk_tcp_close((Socket)s->child); |
| 1339 | |
| 1340 | del234(sktree, s); |
| 1341 | do_select(s->s, 0); |
| 1342 | p_closesocket(s->s); |
| 1343 | if (s->addr) |
| 1344 | sk_addr_free(s->addr); |
| 1345 | sfree(s); |
| 1346 | } |
| 1347 | |
| 1348 | /* |
| 1349 | * The function which tries to send on a socket once it's deemed |
| 1350 | * writable. |
| 1351 | */ |
| 1352 | void try_send(Actual_Socket s) |
| 1353 | { |
| 1354 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
| 1355 | int nsent; |
| 1356 | DWORD err; |
| 1357 | void *data; |
| 1358 | int len, urgentflag; |
| 1359 | |
| 1360 | if (s->sending_oob) { |
| 1361 | urgentflag = MSG_OOB; |
| 1362 | len = s->sending_oob; |
| 1363 | data = &s->oobdata; |
| 1364 | } else { |
| 1365 | urgentflag = 0; |
| 1366 | bufchain_prefix(&s->output_data, &data, &len); |
| 1367 | } |
| 1368 | nsent = p_send(s->s, data, len, urgentflag); |
| 1369 | noise_ultralight(nsent); |
| 1370 | if (nsent <= 0) { |
| 1371 | err = (nsent < 0 ? p_WSAGetLastError() : 0); |
| 1372 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
| 1373 | /* |
| 1374 | * Perfectly normal: we've sent all we can for the moment. |
| 1375 | * |
| 1376 | * (Some WinSock send() implementations can return |
| 1377 | * <0 but leave no sensible error indication - |
| 1378 | * WSAGetLastError() is called but returns zero or |
| 1379 | * a small number - so we check that case and treat |
| 1380 | * it just like WSAEWOULDBLOCK.) |
| 1381 | */ |
| 1382 | s->writable = FALSE; |
| 1383 | return; |
| 1384 | } else if (nsent == 0 || |
| 1385 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
| 1386 | /* |
| 1387 | * If send() returns CONNABORTED or CONNRESET, we |
| 1388 | * unfortunately can't just call plug_closing(), |
| 1389 | * because it's quite likely that we're currently |
| 1390 | * _in_ a call from the code we'd be calling back |
| 1391 | * to, so we'd have to make half the SSH code |
| 1392 | * reentrant. Instead we flag a pending error on |
| 1393 | * the socket, to be dealt with (by calling |
| 1394 | * plug_closing()) at some suitable future moment. |
| 1395 | */ |
| 1396 | s->pending_error = err; |
| 1397 | return; |
| 1398 | } else { |
| 1399 | /* We're inside the Windows frontend here, so we know |
| 1400 | * that the frontend handle is unnecessary. */ |
| 1401 | logevent(NULL, winsock_error_string(err)); |
| 1402 | fatalbox("%s", winsock_error_string(err)); |
| 1403 | } |
| 1404 | } else { |
| 1405 | if (s->sending_oob) { |
| 1406 | if (nsent < len) { |
| 1407 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
| 1408 | s->sending_oob = len - nsent; |
| 1409 | } else { |
| 1410 | s->sending_oob = 0; |
| 1411 | } |
| 1412 | } else { |
| 1413 | bufchain_consume(&s->output_data, nsent); |
| 1414 | } |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | /* |
| 1419 | * If we reach here, we've finished sending everything we might |
| 1420 | * have needed to send. Send EOF, if we need to. |
| 1421 | */ |
| 1422 | if (s->outgoingeof == EOF_PENDING) { |
| 1423 | p_shutdown(s->s, SD_SEND); |
| 1424 | s->outgoingeof = EOF_SENT; |
| 1425 | } |
| 1426 | } |
| 1427 | |
| 1428 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
| 1429 | { |
| 1430 | Actual_Socket s = (Actual_Socket) sock; |
| 1431 | |
| 1432 | assert(s->outgoingeof == EOF_NO); |
| 1433 | |
| 1434 | /* |
| 1435 | * Add the data to the buffer list on the socket. |
| 1436 | */ |
| 1437 | bufchain_add(&s->output_data, buf, len); |
| 1438 | |
| 1439 | /* |
| 1440 | * Now try sending from the start of the buffer list. |
| 1441 | */ |
| 1442 | if (s->writable) |
| 1443 | try_send(s); |
| 1444 | |
| 1445 | return bufchain_size(&s->output_data); |
| 1446 | } |
| 1447 | |
| 1448 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
| 1449 | { |
| 1450 | Actual_Socket s = (Actual_Socket) sock; |
| 1451 | |
| 1452 | assert(s->outgoingeof == EOF_NO); |
| 1453 | |
| 1454 | /* |
| 1455 | * Replace the buffer list on the socket with the data. |
| 1456 | */ |
| 1457 | bufchain_clear(&s->output_data); |
| 1458 | assert(len <= sizeof(s->oobdata)); |
| 1459 | memcpy(s->oobdata, buf, len); |
| 1460 | s->sending_oob = len; |
| 1461 | |
| 1462 | /* |
| 1463 | * Now try sending from the start of the buffer list. |
| 1464 | */ |
| 1465 | if (s->writable) |
| 1466 | try_send(s); |
| 1467 | |
| 1468 | return s->sending_oob; |
| 1469 | } |
| 1470 | |
| 1471 | static void sk_tcp_write_eof(Socket sock) |
| 1472 | { |
| 1473 | Actual_Socket s = (Actual_Socket) sock; |
| 1474 | |
| 1475 | assert(s->outgoingeof == EOF_NO); |
| 1476 | |
| 1477 | /* |
| 1478 | * Mark the socket as pending outgoing EOF. |
| 1479 | */ |
| 1480 | s->outgoingeof = EOF_PENDING; |
| 1481 | |
| 1482 | /* |
| 1483 | * Now try sending from the start of the buffer list. |
| 1484 | */ |
| 1485 | if (s->writable) |
| 1486 | try_send(s); |
| 1487 | } |
| 1488 | |
| 1489 | int select_result(WPARAM wParam, LPARAM lParam) |
| 1490 | { |
| 1491 | int ret, open; |
| 1492 | DWORD err; |
| 1493 | char buf[20480]; /* nice big buffer for plenty of speed */ |
| 1494 | Actual_Socket s; |
| 1495 | u_long atmark; |
| 1496 | |
| 1497 | /* wParam is the socket itself */ |
| 1498 | |
| 1499 | if (wParam == 0) |
| 1500 | return 1; /* boggle */ |
| 1501 | |
| 1502 | s = find234(sktree, (void *) wParam, cmpforsearch); |
| 1503 | if (!s) |
| 1504 | return 1; /* boggle */ |
| 1505 | |
| 1506 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
| 1507 | /* |
| 1508 | * An error has occurred on this socket. Pass it to the |
| 1509 | * plug. |
| 1510 | */ |
| 1511 | if (s->addr) { |
| 1512 | plug_log(s->plug, 1, s->addr, s->port, |
| 1513 | winsock_error_string(err), err); |
| 1514 | while (s->addr && sk_nextaddr(s->addr, &s->step)) { |
| 1515 | err = try_connect(s); |
| 1516 | } |
| 1517 | } |
| 1518 | if (err != 0) |
| 1519 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
| 1520 | else |
| 1521 | return 1; |
| 1522 | } |
| 1523 | |
| 1524 | noise_ultralight(lParam); |
| 1525 | |
| 1526 | switch (WSAGETSELECTEVENT(lParam)) { |
| 1527 | case FD_CONNECT: |
| 1528 | s->connected = s->writable = 1; |
| 1529 | /* |
| 1530 | * Once a socket is connected, we can stop falling |
| 1531 | * back through the candidate addresses to connect |
| 1532 | * to. |
| 1533 | */ |
| 1534 | if (s->addr) { |
| 1535 | sk_addr_free(s->addr); |
| 1536 | s->addr = NULL; |
| 1537 | } |
| 1538 | break; |
| 1539 | case FD_READ: |
| 1540 | /* In the case the socket is still frozen, we don't even bother */ |
| 1541 | if (s->frozen) { |
| 1542 | s->frozen_readable = 1; |
| 1543 | break; |
| 1544 | } |
| 1545 | |
| 1546 | /* |
| 1547 | * We have received data on the socket. For an oobinline |
| 1548 | * socket, this might be data _before_ an urgent pointer, |
| 1549 | * in which case we send it to the back end with type==1 |
| 1550 | * (data prior to urgent). |
| 1551 | */ |
| 1552 | if (s->oobinline) { |
| 1553 | atmark = 1; |
| 1554 | p_ioctlsocket(s->s, SIOCATMARK, &atmark); |
| 1555 | /* |
| 1556 | * Avoid checking the return value from ioctlsocket(), |
| 1557 | * on the grounds that some WinSock wrappers don't |
| 1558 | * support it. If it does nothing, we get atmark==1, |
| 1559 | * which is equivalent to `no OOB pending', so the |
| 1560 | * effect will be to non-OOB-ify any OOB data. |
| 1561 | */ |
| 1562 | } else |
| 1563 | atmark = 1; |
| 1564 | |
| 1565 | ret = p_recv(s->s, buf, sizeof(buf), 0); |
| 1566 | noise_ultralight(ret); |
| 1567 | if (ret < 0) { |
| 1568 | err = p_WSAGetLastError(); |
| 1569 | if (err == WSAEWOULDBLOCK) { |
| 1570 | break; |
| 1571 | } |
| 1572 | } |
| 1573 | if (ret < 0) { |
| 1574 | return plug_closing(s->plug, winsock_error_string(err), err, |
| 1575 | 0); |
| 1576 | } else if (0 == ret) { |
| 1577 | return plug_closing(s->plug, NULL, 0, 0); |
| 1578 | } else { |
| 1579 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
| 1580 | } |
| 1581 | break; |
| 1582 | case FD_OOB: |
| 1583 | /* |
| 1584 | * This will only happen on a non-oobinline socket. It |
| 1585 | * indicates that we can immediately perform an OOB read |
| 1586 | * and get back OOB data, which we will send to the back |
| 1587 | * end with type==2 (urgent data). |
| 1588 | */ |
| 1589 | ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB); |
| 1590 | noise_ultralight(ret); |
| 1591 | if (ret <= 0) { |
| 1592 | char *str = (ret == 0 ? "Internal networking trouble" : |
| 1593 | winsock_error_string(p_WSAGetLastError())); |
| 1594 | /* We're inside the Windows frontend here, so we know |
| 1595 | * that the frontend handle is unnecessary. */ |
| 1596 | logevent(NULL, str); |
| 1597 | fatalbox("%s", str); |
| 1598 | } else { |
| 1599 | return plug_receive(s->plug, 2, buf, ret); |
| 1600 | } |
| 1601 | break; |
| 1602 | case FD_WRITE: |
| 1603 | { |
| 1604 | int bufsize_before, bufsize_after; |
| 1605 | s->writable = 1; |
| 1606 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
| 1607 | try_send(s); |
| 1608 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
| 1609 | if (bufsize_after < bufsize_before) |
| 1610 | plug_sent(s->plug, bufsize_after); |
| 1611 | } |
| 1612 | break; |
| 1613 | case FD_CLOSE: |
| 1614 | /* Signal a close on the socket. First read any outstanding data. */ |
| 1615 | open = 1; |
| 1616 | do { |
| 1617 | ret = p_recv(s->s, buf, sizeof(buf), 0); |
| 1618 | if (ret < 0) { |
| 1619 | err = p_WSAGetLastError(); |
| 1620 | if (err == WSAEWOULDBLOCK) |
| 1621 | break; |
| 1622 | return plug_closing(s->plug, winsock_error_string(err), |
| 1623 | err, 0); |
| 1624 | } else { |
| 1625 | if (ret) |
| 1626 | open &= plug_receive(s->plug, 0, buf, ret); |
| 1627 | else |
| 1628 | open &= plug_closing(s->plug, NULL, 0, 0); |
| 1629 | } |
| 1630 | } while (ret > 0); |
| 1631 | return open; |
| 1632 | case FD_ACCEPT: |
| 1633 | { |
| 1634 | #ifdef NO_IPV6 |
| 1635 | struct sockaddr_in isa; |
| 1636 | #else |
| 1637 | struct sockaddr_storage isa; |
| 1638 | #endif |
| 1639 | int addrlen = sizeof(isa); |
| 1640 | SOCKET t; /* socket of connection */ |
| 1641 | |
| 1642 | memset(&isa, 0, sizeof(isa)); |
| 1643 | err = 0; |
| 1644 | t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen); |
| 1645 | if (t == INVALID_SOCKET) |
| 1646 | { |
| 1647 | err = p_WSAGetLastError(); |
| 1648 | if (err == WSATRY_AGAIN) |
| 1649 | break; |
| 1650 | } |
| 1651 | #ifndef NO_IPV6 |
| 1652 | if (isa.ss_family == AF_INET && |
| 1653 | s->localhost_only && |
| 1654 | !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr)) |
| 1655 | #else |
| 1656 | if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr)) |
| 1657 | #endif |
| 1658 | { |
| 1659 | p_closesocket(t); /* dodgy WinSock let nonlocal through */ |
| 1660 | } else if (plug_accepting(s->plug, (void*)t)) { |
| 1661 | p_closesocket(t); /* denied or error */ |
| 1662 | } |
| 1663 | } |
| 1664 | } |
| 1665 | |
| 1666 | return 1; |
| 1667 | } |
| 1668 | |
| 1669 | /* |
| 1670 | * Deal with socket errors detected in try_send(). |
| 1671 | */ |
| 1672 | void net_pending_errors(void) |
| 1673 | { |
| 1674 | int i; |
| 1675 | Actual_Socket s; |
| 1676 | |
| 1677 | /* |
| 1678 | * This might be a fiddly business, because it's just possible |
| 1679 | * that handling a pending error on one socket might cause |
| 1680 | * others to be closed. (I can't think of any reason this might |
| 1681 | * happen in current SSH implementation, but to maintain |
| 1682 | * generality of this network layer I'll assume the worst.) |
| 1683 | * |
| 1684 | * So what we'll do is search the socket list for _one_ socket |
| 1685 | * with a pending error, and then handle it, and then search |
| 1686 | * the list again _from the beginning_. Repeat until we make a |
| 1687 | * pass with no socket errors present. That way we are |
| 1688 | * protected against the socket list changing under our feet. |
| 1689 | */ |
| 1690 | |
| 1691 | do { |
| 1692 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 1693 | if (s->pending_error) { |
| 1694 | /* |
| 1695 | * An error has occurred on this socket. Pass it to the |
| 1696 | * plug. |
| 1697 | */ |
| 1698 | plug_closing(s->plug, |
| 1699 | winsock_error_string(s->pending_error), |
| 1700 | s->pending_error, 0); |
| 1701 | break; |
| 1702 | } |
| 1703 | } |
| 1704 | } while (s); |
| 1705 | } |
| 1706 | |
| 1707 | /* |
| 1708 | * Each socket abstraction contains a `void *' private field in |
| 1709 | * which the client can keep state. |
| 1710 | */ |
| 1711 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
| 1712 | { |
| 1713 | Actual_Socket s = (Actual_Socket) sock; |
| 1714 | s->private_ptr = ptr; |
| 1715 | } |
| 1716 | |
| 1717 | static void *sk_tcp_get_private_ptr(Socket sock) |
| 1718 | { |
| 1719 | Actual_Socket s = (Actual_Socket) sock; |
| 1720 | return s->private_ptr; |
| 1721 | } |
| 1722 | |
| 1723 | /* |
| 1724 | * Special error values are returned from sk_namelookup and sk_new |
| 1725 | * if there's a problem. These functions extract an error message, |
| 1726 | * or return NULL if there's no problem. |
| 1727 | */ |
| 1728 | const char *sk_addr_error(SockAddr addr) |
| 1729 | { |
| 1730 | return addr->error; |
| 1731 | } |
| 1732 | static const char *sk_tcp_socket_error(Socket sock) |
| 1733 | { |
| 1734 | Actual_Socket s = (Actual_Socket) sock; |
| 1735 | return s->error; |
| 1736 | } |
| 1737 | |
| 1738 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
| 1739 | { |
| 1740 | Actual_Socket s = (Actual_Socket) sock; |
| 1741 | if (s->frozen == is_frozen) |
| 1742 | return; |
| 1743 | s->frozen = is_frozen; |
| 1744 | if (!is_frozen) { |
| 1745 | do_select(s->s, 1); |
| 1746 | if (s->frozen_readable) { |
| 1747 | char c; |
| 1748 | p_recv(s->s, &c, 1, MSG_PEEK); |
| 1749 | } |
| 1750 | } |
| 1751 | s->frozen_readable = 0; |
| 1752 | } |
| 1753 | |
| 1754 | void socket_reselect_all(void) |
| 1755 | { |
| 1756 | Actual_Socket s; |
| 1757 | int i; |
| 1758 | |
| 1759 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 1760 | if (!s->frozen) |
| 1761 | do_select(s->s, 1); |
| 1762 | } |
| 1763 | } |
| 1764 | |
| 1765 | /* |
| 1766 | * For Plink: enumerate all sockets currently active. |
| 1767 | */ |
| 1768 | SOCKET first_socket(int *state) |
| 1769 | { |
| 1770 | Actual_Socket s; |
| 1771 | *state = 0; |
| 1772 | s = index234(sktree, (*state)++); |
| 1773 | return s ? s->s : INVALID_SOCKET; |
| 1774 | } |
| 1775 | |
| 1776 | SOCKET next_socket(int *state) |
| 1777 | { |
| 1778 | Actual_Socket s = index234(sktree, (*state)++); |
| 1779 | return s ? s->s : INVALID_SOCKET; |
| 1780 | } |
| 1781 | |
| 1782 | extern int socket_writable(SOCKET skt) |
| 1783 | { |
| 1784 | Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch); |
| 1785 | |
| 1786 | if (s) |
| 1787 | return bufchain_size(&s->output_data) > 0; |
| 1788 | else |
| 1789 | return 0; |
| 1790 | } |
| 1791 | |
| 1792 | int net_service_lookup(char *service) |
| 1793 | { |
| 1794 | struct servent *se; |
| 1795 | se = p_getservbyname(service, NULL); |
| 1796 | if (se != NULL) |
| 1797 | return p_ntohs(se->s_port); |
| 1798 | else |
| 1799 | return 0; |
| 1800 | } |
| 1801 | |
| 1802 | char *get_hostname(void) |
| 1803 | { |
| 1804 | int len = 128; |
| 1805 | char *hostname = NULL; |
| 1806 | do { |
| 1807 | len *= 2; |
| 1808 | hostname = sresize(hostname, len, char); |
| 1809 | if (p_gethostname(hostname, len) < 0) { |
| 1810 | sfree(hostname); |
| 1811 | hostname = NULL; |
| 1812 | break; |
| 1813 | } |
| 1814 | } while (strlen(hostname) >= (size_t)(len-1)); |
| 1815 | return hostname; |
| 1816 | } |
| 1817 | |
| 1818 | SockAddr platform_get_x11_unix_address(const char *display, int displaynum, |
| 1819 | char **canonicalname) |
| 1820 | { |
| 1821 | SockAddr ret = snew(struct SockAddr_tag); |
| 1822 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 1823 | ret->error = "unix sockets not supported on this platform"; |
| 1824 | ret->refcount = 1; |
| 1825 | return ret; |
| 1826 | } |