| 1 | /* |
| 2 | * Windows networking abstraction. |
| 3 | * |
| 4 | * Due to this clean abstraction it was possible |
| 5 | * to easily implement IPv6 support :) |
| 6 | * |
| 7 | * IPv6 patch 1 (27 October 2000) Jeroen Massar <jeroen@unfix.org> |
| 8 | * - Preliminary hacked IPv6 support. |
| 9 | * - Connecting to IPv6 address (eg fec0:4242:4242:100:2d0:b7ff:fe8f:5d42) works. |
| 10 | * - Connecting to IPv6 hostname (eg heaven.ipv6.unfix.org) works. |
| 11 | * - Compiles as either IPv4 or IPv6. |
| 12 | * |
| 13 | * IPv6 patch 2 (29 October 2000) Jeroen Massar <jeroen@unfix.org> |
| 14 | * - When compiled as IPv6 it also allows connecting to IPv4 hosts. |
| 15 | * - Added some more documentation. |
| 16 | * |
| 17 | * IPv6 patch 3 (18 November 2000) Jeroen Massar <jeroen@unfix.org> |
| 18 | * - It now supports dynamically loading the IPv6 resolver dll's. |
| 19 | * This way we should be able to distribute one (1) binary |
| 20 | * which supports both IPv4 and IPv6. |
| 21 | * - getaddrinfo() and getnameinfo() are loaded dynamicaly if possible. |
| 22 | * - in6addr_any is defined in this file so we don't need to link to wship6.lib |
| 23 | * - The patch is now more unified so that we can still |
| 24 | * remove all IPv6 support by undef'ing IPV6. |
| 25 | * But where it fallsback to IPv4 it uses the IPv4 code which is already in place... |
| 26 | * - Canonical name resolving works. |
| 27 | * |
| 28 | * IPv6 patch 4 (07 January 2001) Jeroen Massar <jeroen@unfix.org> |
| 29 | * - patch against CVS of today, will be submitted to the bugs list |
| 30 | * as a 'cvs diff -u' on Simon's request... |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * Define IPV6 to have IPv6 on-the-fly-loading support. |
| 36 | * This means that one doesn't have to have an IPv6 stack to use it. |
| 37 | * But if an IPv6 stack is found it is used with a fallback to IPv4. |
| 38 | */ |
| 39 | /* #define IPV6 1 */ |
| 40 | |
| 41 | #ifdef IPV6 |
| 42 | #include <winsock2.h> |
| 43 | #include <ws2tcpip.h> |
| 44 | #include <tpipv6.h> |
| 45 | #else |
| 46 | #include <winsock.h> |
| 47 | #endif |
| 48 | #include <windows.h> |
| 49 | #include <stdio.h> |
| 50 | #include <stdlib.h> |
| 51 | |
| 52 | #include "putty.h" |
| 53 | #include "network.h" |
| 54 | #include "tree234.h" |
| 55 | |
| 56 | #define BUFFER_GRANULE 512 |
| 57 | |
| 58 | struct Socket_tag { |
| 59 | char *error; |
| 60 | SOCKET s; |
| 61 | sk_receiver_t receiver; |
| 62 | void *private_ptr; |
| 63 | struct buffer *head, *tail; |
| 64 | int writable; |
| 65 | int in_oob, sending_oob; |
| 66 | }; |
| 67 | |
| 68 | struct SockAddr_tag { |
| 69 | char *error; |
| 70 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
| 71 | int family; |
| 72 | unsigned long address; /* Address IPv4 style. */ |
| 73 | #ifdef IPV6 |
| 74 | struct addrinfo *ai; /* Address IPv6 style. */ |
| 75 | #endif |
| 76 | /* |
| 77 | * We need to have this lengthy enough to hold *any* hostname |
| 78 | * (including IPv6 reverse...) |
| 79 | */ |
| 80 | char realhost[8192]; |
| 81 | }; |
| 82 | |
| 83 | struct buffer { |
| 84 | struct buffer *next; |
| 85 | int buflen, bufpos; |
| 86 | char buf[BUFFER_GRANULE]; |
| 87 | }; |
| 88 | |
| 89 | static tree234 *sktree; |
| 90 | |
| 91 | static int cmpfortree(void *av, void *bv) { |
| 92 | Socket a = (Socket)av, b = (Socket)bv; |
| 93 | unsigned long as = (unsigned long)a->s, bs = (unsigned long)b->s; |
| 94 | if (as < bs) return -1; |
| 95 | if (as > bs) return +1; |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static int cmpforsearch(void *av, void *bv) { |
| 100 | Socket b = (Socket)bv; |
| 101 | unsigned long as = (unsigned long)av, bs = (unsigned long)b->s; |
| 102 | if (as < bs) return -1; |
| 103 | if (as > bs) return +1; |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | void sk_init(void) { |
| 108 | sktree = newtree234(cmpfortree); |
| 109 | } |
| 110 | |
| 111 | char *winsock_error_string(int error) { |
| 112 | switch (error) { |
| 113 | case WSAEACCES: return "Network error: Permission denied"; |
| 114 | case WSAEADDRINUSE: return "Network error: Address already in use"; |
| 115 | case WSAEADDRNOTAVAIL: return "Network error: Cannot assign requested address"; |
| 116 | case WSAEAFNOSUPPORT: return "Network error: Address family not supported by protocol family"; |
| 117 | case WSAEALREADY: return "Network error: Operation already in progress"; |
| 118 | case WSAECONNABORTED: return "Network error: Software caused connection abort"; |
| 119 | case WSAECONNREFUSED: return "Network error: Connection refused"; |
| 120 | case WSAECONNRESET: return "Network error: Connection reset by peer"; |
| 121 | case WSAEDESTADDRREQ: return "Network error: Destination address required"; |
| 122 | case WSAEFAULT: return "Network error: Bad address"; |
| 123 | case WSAEHOSTDOWN: return "Network error: Host is down"; |
| 124 | case WSAEHOSTUNREACH: return "Network error: No route to host"; |
| 125 | case WSAEINPROGRESS: return "Network error: Operation now in progress"; |
| 126 | case WSAEINTR: return "Network error: Interrupted function call"; |
| 127 | case WSAEINVAL: return "Network error: Invalid argument"; |
| 128 | case WSAEISCONN: return "Network error: Socket is already connected"; |
| 129 | case WSAEMFILE: return "Network error: Too many open files"; |
| 130 | case WSAEMSGSIZE: return "Network error: Message too long"; |
| 131 | case WSAENETDOWN: return "Network error: Network is down"; |
| 132 | case WSAENETRESET: return "Network error: Network dropped connection on reset"; |
| 133 | case WSAENETUNREACH: return "Network error: Network is unreachable"; |
| 134 | case WSAENOBUFS: return "Network error: No buffer space available"; |
| 135 | case WSAENOPROTOOPT: return "Network error: Bad protocol option"; |
| 136 | case WSAENOTCONN: return "Network error: Socket is not connected"; |
| 137 | case WSAENOTSOCK: return "Network error: Socket operation on non-socket"; |
| 138 | case WSAEOPNOTSUPP: return "Network error: Operation not supported"; |
| 139 | case WSAEPFNOSUPPORT: return "Network error: Protocol family not supported"; |
| 140 | case WSAEPROCLIM: return "Network error: Too many processes"; |
| 141 | case WSAEPROTONOSUPPORT: return "Network error: Protocol not supported"; |
| 142 | case WSAEPROTOTYPE: return "Network error: Protocol wrong type for socket"; |
| 143 | case WSAESHUTDOWN: return "Network error: Cannot send after socket shutdown"; |
| 144 | case WSAESOCKTNOSUPPORT: return "Network error: Socket type not supported"; |
| 145 | case WSAETIMEDOUT: return "Network error: Connection timed out"; |
| 146 | case WSAEWOULDBLOCK: return "Network error: Resource temporarily unavailable"; |
| 147 | case WSAEDISCON: return "Network error: Graceful shutdown in progress"; |
| 148 | default: return "Unknown network error"; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | SockAddr sk_namelookup(char *host, char **canonicalname) |
| 153 | { |
| 154 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
| 155 | unsigned long a; |
| 156 | struct hostent *h = NULL; |
| 157 | |
| 158 | /* Clear the structure and default to IPv4. */ |
| 159 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 160 | ret->family = 0; /* We set this one when we have resolved the host. */ |
| 161 | *canonicalname = ret->realhost; /* This makes sure we always have a hostname to return. */ |
| 162 | |
| 163 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) |
| 164 | { |
| 165 | #ifdef IPV6 |
| 166 | |
| 167 | /* Try to get the getaddrinfo() function from wship6.dll */ |
| 168 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
| 169 | * it will fallback to IPv4. */ |
| 170 | typedef int (CALLBACK* FGETADDRINFO)(const char *nodename, |
| 171 | const char *servname, |
| 172 | const struct addrinfo *hints, |
| 173 | struct addrinfo **res); |
| 174 | FGETADDRINFO fGetAddrInfo = NULL; |
| 175 | |
| 176 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
| 177 | if (dllWSHIP6) |
| 178 | fGetAddrInfo = (FGETADDRINFO)GetProcAddress(dllWSHIP6, |
| 179 | "getaddrinfo"); |
| 180 | |
| 181 | /* |
| 182 | * Use fGetAddrInfo when it's available (which usually also |
| 183 | * means IPv6 is installed...) |
| 184 | */ |
| 185 | if (fGetAddrInfo) |
| 186 | { |
| 187 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
| 188 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
| 189 | ret->family = ret->ai->ai_family; |
| 190 | } |
| 191 | else |
| 192 | #endif |
| 193 | /* |
| 194 | * Otherwise use the IPv4-only gethostbyname... |
| 195 | * (NOTE: we don't use gethostbyname as a |
| 196 | * fallback!) |
| 197 | */ |
| 198 | if (ret->family == 0) |
| 199 | { |
| 200 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
| 201 | if (h = gethostbyname(host)) ret->family = AF_INET; |
| 202 | } |
| 203 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
| 204 | |
| 205 | if (ret->family == 0) |
| 206 | { |
| 207 | DWORD err = WSAGetLastError(); |
| 208 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
| 209 | err == WSAHOST_NOT_FOUND ? "Host does not exist" : |
| 210 | err == WSATRY_AGAIN ? "Host not found" : |
| 211 | #ifdef IPV6 |
| 212 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
| 213 | #endif |
| 214 | "gethostbyname: unknown error"); |
| 215 | #ifdef DEBUG |
| 216 | { |
| 217 | LPVOID lpMsgBuf; |
| 218 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&lpMsgBuf, 0, NULL); |
| 219 | debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); |
| 220 | /* Free the buffer. */ |
| 221 | LocalFree(lpMsgBuf); |
| 222 | } |
| 223 | #endif |
| 224 | } |
| 225 | else |
| 226 | { |
| 227 | ret->error = NULL; |
| 228 | |
| 229 | #ifdef IPV6 |
| 230 | /* If we got an address info use that... */ |
| 231 | if (ret->ai) |
| 232 | { |
| 233 | typedef int (CALLBACK* FGETNAMEINFO) |
| 234 | (const struct sockaddr FAR *sa, socklen_t salen, |
| 235 | char FAR * host, size_t hostlen, char FAR * serv, |
| 236 | size_t servlen, int flags); |
| 237 | FGETNAMEINFO fGetNameInfo = NULL; |
| 238 | |
| 239 | /* Are we in IPv4 fallback mode? */ |
| 240 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
| 241 | if (ret->family == AF_INET) |
| 242 | memcpy(&a, (char *)&((SOCKADDR_IN *)ret->ai->ai_addr)->sin_addr, sizeof(a)); |
| 243 | |
| 244 | /* Now let's find that canonicalname... */ |
| 245 | if ((dllWSHIP6) && (fGetNameInfo = (FGETNAMEINFO)GetProcAddress(dllWSHIP6, "getnameinfo"))) |
| 246 | { |
| 247 | if (fGetNameInfo((struct sockaddr *)ret->ai->ai_addr, |
| 248 | ret->family == AF_INET ? |
| 249 | sizeof(SOCKADDR_IN) : |
| 250 | sizeof(SOCKADDR_IN6), ret->realhost, |
| 251 | sizeof(ret->realhost), NULL, |
| 252 | 0, 0) != 0) |
| 253 | { |
| 254 | strncpy(ret->realhost, host, |
| 255 | sizeof(ret->realhost)); |
| 256 | } |
| 257 | } |
| 258 | } |
| 259 | /* We used the IPv4-only gethostbyname()... */ |
| 260 | else |
| 261 | { |
| 262 | #endif |
| 263 | memcpy(&a, h->h_addr, sizeof(a)); |
| 264 | /* This way we are always sure the h->h_name is valid :) */ |
| 265 | strncpy(ret->realhost, h->h_name, sizeof(ret->realhost)); |
| 266 | #ifdef IPV6 |
| 267 | } |
| 268 | #endif |
| 269 | } |
| 270 | #ifdef IPV6 |
| 271 | FreeLibrary(dllWSHIP6); |
| 272 | #endif |
| 273 | } |
| 274 | else |
| 275 | { |
| 276 | *canonicalname = host; |
| 277 | } |
| 278 | ret->address = ntohl(a); |
| 279 | return ret; |
| 280 | } |
| 281 | |
| 282 | void sk_addr_free(SockAddr addr) { |
| 283 | sfree(addr); |
| 284 | } |
| 285 | |
| 286 | Socket sk_new(SockAddr addr, int port, sk_receiver_t receiver) { |
| 287 | SOCKET s; |
| 288 | #ifdef IPV6 |
| 289 | SOCKADDR_IN6 a6; |
| 290 | #endif |
| 291 | SOCKADDR_IN a; |
| 292 | DWORD err; |
| 293 | char *errstr; |
| 294 | Socket ret; |
| 295 | extern char *do_select(SOCKET skt, int startup); |
| 296 | |
| 297 | /* |
| 298 | * Create Socket structure. |
| 299 | */ |
| 300 | ret = smalloc(sizeof(struct Socket_tag)); |
| 301 | ret->error = NULL; |
| 302 | ret->receiver = receiver; |
| 303 | ret->head = ret->tail = NULL; |
| 304 | ret->writable = 1; /* to start with */ |
| 305 | ret->in_oob = FALSE; |
| 306 | ret->sending_oob = 0; |
| 307 | |
| 308 | /* |
| 309 | * Open socket. |
| 310 | */ |
| 311 | s = socket(addr->family, SOCK_STREAM, 0); |
| 312 | ret->s = s; |
| 313 | |
| 314 | if (s == INVALID_SOCKET) { |
| 315 | err = WSAGetLastError(); |
| 316 | ret->error = winsock_error_string(err); |
| 317 | return ret; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Bind to local address. |
| 322 | */ |
| 323 | #ifdef IPV6 |
| 324 | if (addr->family == AF_INET6) |
| 325 | { |
| 326 | memset(&a6,0,sizeof(a6)); |
| 327 | a6.sin6_family = AF_INET6; |
| 328 | /*a6.sin6_addr = in6addr_any;*/ /* == 0 */ |
| 329 | a6.sin6_port = htons(0); |
| 330 | } |
| 331 | else |
| 332 | { |
| 333 | #endif |
| 334 | a.sin_family = AF_INET; |
| 335 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
| 336 | a.sin_port = htons(0); |
| 337 | #ifdef IPV6 |
| 338 | } |
| 339 | if (bind (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR) |
| 340 | #else |
| 341 | if (bind (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) |
| 342 | #endif |
| 343 | { |
| 344 | err = WSAGetLastError(); |
| 345 | ret->error = winsock_error_string(err); |
| 346 | return ret; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Connect to remote address. |
| 351 | */ |
| 352 | #ifdef IPV6 |
| 353 | if (addr->family == AF_INET6) |
| 354 | { |
| 355 | memset(&a,0,sizeof(a)); |
| 356 | a6.sin6_family = AF_INET6; |
| 357 | a6.sin6_port = htons((short)port); |
| 358 | a6.sin6_addr = ((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr; |
| 359 | } |
| 360 | else |
| 361 | { |
| 362 | #endif |
| 363 | a.sin_family = AF_INET; |
| 364 | a.sin_addr.s_addr = htonl(addr->address); |
| 365 | a.sin_port = htons((short)port); |
| 366 | #ifdef IPV6 |
| 367 | } |
| 368 | if (connect (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR) |
| 369 | #else |
| 370 | if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) |
| 371 | #endif |
| 372 | { |
| 373 | err = WSAGetLastError(); |
| 374 | ret->error = winsock_error_string(err); |
| 375 | return ret; |
| 376 | } |
| 377 | |
| 378 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 379 | * window, or an EventSelect on an event object. */ |
| 380 | errstr = do_select(s, 1); |
| 381 | if (errstr) { |
| 382 | ret->error = errstr; |
| 383 | return ret; |
| 384 | } |
| 385 | |
| 386 | add234(sktree, ret); |
| 387 | |
| 388 | return ret; |
| 389 | } |
| 390 | |
| 391 | void sk_close(Socket s) { |
| 392 | del234(sktree, s); |
| 393 | do_select(s->s, 0); |
| 394 | closesocket(s->s); |
| 395 | sfree(s); |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * The function which tries to send on a socket once it's deemed |
| 400 | * writable. |
| 401 | */ |
| 402 | void try_send(Socket s) { |
| 403 | while (s->head) { |
| 404 | int nsent; |
| 405 | DWORD err; |
| 406 | int len, urgentflag; |
| 407 | |
| 408 | if (s->sending_oob) { |
| 409 | urgentflag = MSG_OOB; |
| 410 | len = s->sending_oob; |
| 411 | } else { |
| 412 | urgentflag = 0; |
| 413 | len = s->head->buflen - s->head->bufpos; |
| 414 | } |
| 415 | |
| 416 | nsent = send(s->s, s->head->buf + s->head->bufpos, len, urgentflag); |
| 417 | noise_ultralight(nsent); |
| 418 | if (nsent <= 0) { |
| 419 | err = (nsent < 0 ? WSAGetLastError() : 0); |
| 420 | if (err == WSAEWOULDBLOCK) { |
| 421 | /* Perfectly normal: we've sent all we can for the moment. */ |
| 422 | s->writable = FALSE; |
| 423 | return; |
| 424 | } else if (nsent == 0 || |
| 425 | err == WSAECONNABORTED || |
| 426 | err == WSAECONNRESET) { |
| 427 | /* |
| 428 | * FIXME. This will have to be done better when we |
| 429 | * start managing multiple sockets (e.g. SSH port |
| 430 | * forwarding), because if we get CONNRESET while |
| 431 | * trying to write a particular forwarded socket |
| 432 | * then it isn't necessarily the end of the world. |
| 433 | * Ideally I'd like to pass the error code back to |
| 434 | * somewhere the next select_result() will see it, |
| 435 | * but that might be hard. Perhaps I should pass it |
| 436 | * back to be queued in the Windows front end bit. |
| 437 | */ |
| 438 | fatalbox(winsock_error_string(err)); |
| 439 | } else { |
| 440 | fatalbox(winsock_error_string(err)); |
| 441 | } |
| 442 | } else { |
| 443 | s->head->bufpos += nsent; |
| 444 | if (s->sending_oob) |
| 445 | s->sending_oob -= nsent; |
| 446 | if (s->head->bufpos >= s->head->buflen) { |
| 447 | struct buffer *tmp = s->head; |
| 448 | s->head = tmp->next; |
| 449 | sfree(tmp); |
| 450 | if (!s->head) |
| 451 | s->tail = NULL; |
| 452 | } |
| 453 | } |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | void sk_write(Socket s, char *buf, int len) { |
| 458 | /* |
| 459 | * Add the data to the buffer list on the socket. |
| 460 | */ |
| 461 | if (s->tail && s->tail->buflen < BUFFER_GRANULE) { |
| 462 | int copylen = min(len, BUFFER_GRANULE - s->tail->buflen); |
| 463 | memcpy(s->tail->buf + s->tail->buflen, buf, copylen); |
| 464 | buf += copylen; |
| 465 | len -= copylen; |
| 466 | s->tail->buflen += copylen; |
| 467 | } |
| 468 | while (len > 0) { |
| 469 | int grainlen = min(len, BUFFER_GRANULE); |
| 470 | struct buffer *newbuf; |
| 471 | newbuf = smalloc(sizeof(struct buffer)); |
| 472 | newbuf->bufpos = 0; |
| 473 | newbuf->buflen = grainlen; |
| 474 | memcpy(newbuf->buf, buf, grainlen); |
| 475 | buf += grainlen; |
| 476 | len -= grainlen; |
| 477 | if (s->tail) |
| 478 | s->tail->next = newbuf; |
| 479 | else |
| 480 | s->head = s->tail = newbuf; |
| 481 | newbuf->next = NULL; |
| 482 | s->tail = newbuf; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Now try sending from the start of the buffer list. |
| 487 | */ |
| 488 | if (s->writable) |
| 489 | try_send(s); |
| 490 | } |
| 491 | |
| 492 | void sk_write_oob(Socket s, char *buf, int len) { |
| 493 | /* |
| 494 | * Replace the buffer list on the socket with the data. |
| 495 | */ |
| 496 | if (!s->head) { |
| 497 | s->head = smalloc(sizeof(struct buffer)); |
| 498 | } else { |
| 499 | struct buffer *walk = s->head->next; |
| 500 | while (walk) { |
| 501 | struct buffer *tmp = walk; |
| 502 | walk = tmp->next; |
| 503 | sfree(tmp); |
| 504 | } |
| 505 | } |
| 506 | s->head->next = NULL; |
| 507 | s->tail = s->head; |
| 508 | s->head->buflen = len; |
| 509 | memcpy(s->head->buf, buf, len); |
| 510 | |
| 511 | /* |
| 512 | * Set the Urgent marker. |
| 513 | */ |
| 514 | s->sending_oob = len; |
| 515 | |
| 516 | /* |
| 517 | * Now try sending from the start of the buffer list. |
| 518 | */ |
| 519 | if (s->writable) |
| 520 | try_send(s); |
| 521 | } |
| 522 | |
| 523 | int select_result(WPARAM wParam, LPARAM lParam) { |
| 524 | int ret; |
| 525 | DWORD err; |
| 526 | char buf[BUFFER_GRANULE]; |
| 527 | Socket s; |
| 528 | u_long atmark; |
| 529 | |
| 530 | /* wParam is the socket itself */ |
| 531 | s = find234(sktree, (void *)wParam, cmpforsearch); |
| 532 | if (!s) |
| 533 | return 1; /* boggle */ |
| 534 | |
| 535 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
| 536 | fatalbox(winsock_error_string(err)); |
| 537 | } |
| 538 | |
| 539 | noise_ultralight(lParam); |
| 540 | |
| 541 | switch (WSAGETSELECTEVENT(lParam)) { |
| 542 | case FD_READ: |
| 543 | ret = recv(s->s, buf, sizeof(buf), 0); |
| 544 | if (ret < 0) { |
| 545 | err = WSAGetLastError(); |
| 546 | if (err == WSAEWOULDBLOCK) { |
| 547 | break; |
| 548 | } |
| 549 | } |
| 550 | if (ret < 0) { |
| 551 | fatalbox(winsock_error_string(err)); |
| 552 | } else { |
| 553 | int type = s->in_oob ? 2 : 0; |
| 554 | s->in_oob = FALSE; |
| 555 | return s->receiver(s, type, buf, ret); |
| 556 | } |
| 557 | break; |
| 558 | case FD_OOB: |
| 559 | /* |
| 560 | * Read all data up to the OOB marker, and send it to the |
| 561 | * receiver with urgent==1 (OOB pending). |
| 562 | */ |
| 563 | atmark = 1; |
| 564 | s->in_oob = TRUE; |
| 565 | /* Some WinSock wrappers don't support this call, so we |
| 566 | * deliberately don't check the return value. If the call |
| 567 | * fails and does nothing, we will get back atmark==1, |
| 568 | * which is good enough to keep going at least. */ |
| 569 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
| 570 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
| 571 | noise_ultralight(ret); |
| 572 | if (ret <= 0) { |
| 573 | fatalbox(ret == 0 ? "Internal networking trouble" : |
| 574 | winsock_error_string(WSAGetLastError())); |
| 575 | } else { |
| 576 | return s->receiver(s, atmark ? 2 : 1, buf, ret); |
| 577 | } |
| 578 | break; |
| 579 | case FD_WRITE: |
| 580 | s->writable = 1; |
| 581 | try_send(s); |
| 582 | break; |
| 583 | case FD_CLOSE: |
| 584 | /* Signal a close on the socket. */ |
| 585 | return s->receiver(s, 0, NULL, 0); |
| 586 | break; |
| 587 | } |
| 588 | |
| 589 | return 1; |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * Each socket abstraction contains a `void *' private field in |
| 594 | * which the client can keep state. |
| 595 | */ |
| 596 | void sk_set_private_ptr(Socket s, void *ptr) { |
| 597 | s->private_ptr = ptr; |
| 598 | } |
| 599 | void *sk_get_private_ptr(Socket s) { |
| 600 | return s->private_ptr; |
| 601 | } |
| 602 | |
| 603 | /* |
| 604 | * Special error values are returned from sk_namelookup and sk_new |
| 605 | * if there's a problem. These functions extract an error message, |
| 606 | * or return NULL if there's no problem. |
| 607 | */ |
| 608 | char *sk_addr_error(SockAddr addr) { |
| 609 | return addr->error; |
| 610 | } |
| 611 | char *sk_socket_error(Socket s) { |
| 612 | return s->error; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * For Plink: enumerate all sockets currently active. |
| 617 | */ |
| 618 | SOCKET first_socket(enum234 *e) { |
| 619 | Socket s = first234(sktree, e); |
| 620 | return s ? s->s : INVALID_SOCKET; |
| 621 | } |
| 622 | SOCKET next_socket(enum234 *e) { |
| 623 | Socket s = next234(e); |
| 624 | return s ? s->s : INVALID_SOCKET; |
| 625 | } |