| 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 | #include <assert.h> |
| 52 | |
| 53 | #define DEFINE_PLUG_METHOD_MACROS |
| 54 | #include "putty.h" |
| 55 | #include "network.h" |
| 56 | #include "tree234.h" |
| 57 | |
| 58 | struct Socket_tag { |
| 59 | struct socket_function_table *fn; |
| 60 | /* the above variable absolutely *must* be the first in this structure */ |
| 61 | char *error; |
| 62 | SOCKET s; |
| 63 | Plug plug; |
| 64 | void *private_ptr; |
| 65 | bufchain output_data; |
| 66 | int connected; |
| 67 | int writable; |
| 68 | int frozen; /* this causes readability notifications to be ignored */ |
| 69 | int frozen_readable; /* this means we missed at least one readability |
| 70 | * notification while we were frozen */ |
| 71 | int localhost_only; /* for listening sockets */ |
| 72 | char oobdata[1]; |
| 73 | int sending_oob; |
| 74 | int oobinline; |
| 75 | int pending_error; /* in case send() returns error */ |
| 76 | }; |
| 77 | |
| 78 | /* |
| 79 | * We used to typedef struct Socket_tag *Socket. |
| 80 | * |
| 81 | * Since we have made the networking abstraction slightly more |
| 82 | * abstract, Socket no longer means a tcp socket (it could mean |
| 83 | * an ssl socket). So now we must use Actual_Socket when we know |
| 84 | * we are talking about a tcp socket. |
| 85 | */ |
| 86 | typedef struct Socket_tag *Actual_Socket; |
| 87 | |
| 88 | struct SockAddr_tag { |
| 89 | char *error; |
| 90 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
| 91 | int family; |
| 92 | unsigned long address; /* Address IPv4 style. */ |
| 93 | #ifdef IPV6 |
| 94 | struct addrinfo *ai; /* Address IPv6 style. */ |
| 95 | #endif |
| 96 | }; |
| 97 | |
| 98 | static tree234 *sktree; |
| 99 | |
| 100 | static int cmpfortree(void *av, void *bv) |
| 101 | { |
| 102 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
| 103 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
| 104 | if (as < bs) |
| 105 | return -1; |
| 106 | if (as > bs) |
| 107 | return +1; |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static int cmpforsearch(void *av, void *bv) |
| 112 | { |
| 113 | Actual_Socket b = (Actual_Socket) bv; |
| 114 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
| 115 | if (as < bs) |
| 116 | return -1; |
| 117 | if (as > bs) |
| 118 | return +1; |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | void sk_init(void) |
| 123 | { |
| 124 | sktree = newtree234(cmpfortree); |
| 125 | } |
| 126 | |
| 127 | char *winsock_error_string(int error) |
| 128 | { |
| 129 | switch (error) { |
| 130 | case WSAEACCES: |
| 131 | return "Network error: Permission denied"; |
| 132 | case WSAEADDRINUSE: |
| 133 | return "Network error: Address already in use"; |
| 134 | case WSAEADDRNOTAVAIL: |
| 135 | return "Network error: Cannot assign requested address"; |
| 136 | case WSAEAFNOSUPPORT: |
| 137 | return |
| 138 | "Network error: Address family not supported by protocol family"; |
| 139 | case WSAEALREADY: |
| 140 | return "Network error: Operation already in progress"; |
| 141 | case WSAECONNABORTED: |
| 142 | return "Network error: Software caused connection abort"; |
| 143 | case WSAECONNREFUSED: |
| 144 | return "Network error: Connection refused"; |
| 145 | case WSAECONNRESET: |
| 146 | return "Network error: Connection reset by peer"; |
| 147 | case WSAEDESTADDRREQ: |
| 148 | return "Network error: Destination address required"; |
| 149 | case WSAEFAULT: |
| 150 | return "Network error: Bad address"; |
| 151 | case WSAEHOSTDOWN: |
| 152 | return "Network error: Host is down"; |
| 153 | case WSAEHOSTUNREACH: |
| 154 | return "Network error: No route to host"; |
| 155 | case WSAEINPROGRESS: |
| 156 | return "Network error: Operation now in progress"; |
| 157 | case WSAEINTR: |
| 158 | return "Network error: Interrupted function call"; |
| 159 | case WSAEINVAL: |
| 160 | return "Network error: Invalid argument"; |
| 161 | case WSAEISCONN: |
| 162 | return "Network error: Socket is already connected"; |
| 163 | case WSAEMFILE: |
| 164 | return "Network error: Too many open files"; |
| 165 | case WSAEMSGSIZE: |
| 166 | return "Network error: Message too long"; |
| 167 | case WSAENETDOWN: |
| 168 | return "Network error: Network is down"; |
| 169 | case WSAENETRESET: |
| 170 | return "Network error: Network dropped connection on reset"; |
| 171 | case WSAENETUNREACH: |
| 172 | return "Network error: Network is unreachable"; |
| 173 | case WSAENOBUFS: |
| 174 | return "Network error: No buffer space available"; |
| 175 | case WSAENOPROTOOPT: |
| 176 | return "Network error: Bad protocol option"; |
| 177 | case WSAENOTCONN: |
| 178 | return "Network error: Socket is not connected"; |
| 179 | case WSAENOTSOCK: |
| 180 | return "Network error: Socket operation on non-socket"; |
| 181 | case WSAEOPNOTSUPP: |
| 182 | return "Network error: Operation not supported"; |
| 183 | case WSAEPFNOSUPPORT: |
| 184 | return "Network error: Protocol family not supported"; |
| 185 | case WSAEPROCLIM: |
| 186 | return "Network error: Too many processes"; |
| 187 | case WSAEPROTONOSUPPORT: |
| 188 | return "Network error: Protocol not supported"; |
| 189 | case WSAEPROTOTYPE: |
| 190 | return "Network error: Protocol wrong type for socket"; |
| 191 | case WSAESHUTDOWN: |
| 192 | return "Network error: Cannot send after socket shutdown"; |
| 193 | case WSAESOCKTNOSUPPORT: |
| 194 | return "Network error: Socket type not supported"; |
| 195 | case WSAETIMEDOUT: |
| 196 | return "Network error: Connection timed out"; |
| 197 | case WSAEWOULDBLOCK: |
| 198 | return "Network error: Resource temporarily unavailable"; |
| 199 | case WSAEDISCON: |
| 200 | return "Network error: Graceful shutdown in progress"; |
| 201 | default: |
| 202 | return "Unknown network error"; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | SockAddr sk_namelookup(char *host, char **canonicalname) |
| 207 | { |
| 208 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
| 209 | unsigned long a; |
| 210 | struct hostent *h = NULL; |
| 211 | char realhost[8192]; |
| 212 | |
| 213 | /* Clear the structure and default to IPv4. */ |
| 214 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 215 | ret->family = 0; /* We set this one when we have resolved the host. */ |
| 216 | *realhost = '\0'; |
| 217 | |
| 218 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
| 219 | #ifdef IPV6 |
| 220 | |
| 221 | /* Try to get the getaddrinfo() function from wship6.dll */ |
| 222 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
| 223 | * it will fallback to IPv4. */ |
| 224 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
| 225 | const char *servname, |
| 226 | const struct addrinfo * |
| 227 | hints, |
| 228 | struct addrinfo ** res); |
| 229 | FGETADDRINFO fGetAddrInfo = NULL; |
| 230 | |
| 231 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
| 232 | if (dllWSHIP6) |
| 233 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
| 234 | "getaddrinfo"); |
| 235 | |
| 236 | /* |
| 237 | * Use fGetAddrInfo when it's available (which usually also |
| 238 | * means IPv6 is installed...) |
| 239 | */ |
| 240 | if (fGetAddrInfo) { |
| 241 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
| 242 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
| 243 | ret->family = ret->ai->ai_family; |
| 244 | } else |
| 245 | #endif |
| 246 | { |
| 247 | /* |
| 248 | * Otherwise use the IPv4-only gethostbyname... |
| 249 | * (NOTE: we don't use gethostbyname as a |
| 250 | * fallback!) |
| 251 | */ |
| 252 | if (ret->family == 0) { |
| 253 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
| 254 | if ( (h = gethostbyname(host)) ) |
| 255 | ret->family = AF_INET; |
| 256 | } |
| 257 | } |
| 258 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
| 259 | |
| 260 | if (ret->family == 0) { |
| 261 | DWORD err = WSAGetLastError(); |
| 262 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
| 263 | err == |
| 264 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
| 265 | == WSATRY_AGAIN ? "Host not found" : |
| 266 | #ifdef IPV6 |
| 267 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
| 268 | #endif |
| 269 | "gethostbyname: unknown error"); |
| 270 | #ifdef DEBUG |
| 271 | { |
| 272 | LPVOID lpMsgBuf; |
| 273 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | |
| 274 | FORMAT_MESSAGE_FROM_SYSTEM | |
| 275 | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
| 276 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
| 277 | (LPTSTR) & lpMsgBuf, 0, NULL); |
| 278 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */ |
| 279 | /* Free the buffer. */ |
| 280 | LocalFree(lpMsgBuf); |
| 281 | } |
| 282 | #endif |
| 283 | } else { |
| 284 | ret->error = NULL; |
| 285 | |
| 286 | #ifdef IPV6 |
| 287 | /* If we got an address info use that... */ |
| 288 | if (ret->ai) { |
| 289 | typedef int (CALLBACK * FGETNAMEINFO) |
| 290 | (const struct sockaddr FAR * sa, socklen_t salen, |
| 291 | char FAR * host, size_t hostlen, char FAR * serv, |
| 292 | size_t servlen, int flags); |
| 293 | FGETNAMEINFO fGetNameInfo = NULL; |
| 294 | |
| 295 | /* Are we in IPv4 fallback mode? */ |
| 296 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
| 297 | if (ret->family == AF_INET) |
| 298 | memcpy(&a, |
| 299 | (char *) &((SOCKADDR_IN *) ret->ai-> |
| 300 | ai_addr)->sin_addr, sizeof(a)); |
| 301 | |
| 302 | /* Now let's find that canonicalname... */ |
| 303 | if ((dllWSHIP6) |
| 304 | && (fGetNameInfo = |
| 305 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
| 306 | "getnameinfo"))) { |
| 307 | if (fGetNameInfo |
| 308 | ((struct sockaddr *) ret->ai->ai_addr, |
| 309 | ret->family == |
| 310 | AF_INET ? sizeof(SOCKADDR_IN) : |
| 311 | sizeof(SOCKADDR_IN6), realhost, |
| 312 | sizeof(realhost), NULL, 0, 0) != 0) { |
| 313 | strncpy(realhost, host, sizeof(realhost)); |
| 314 | } |
| 315 | } |
| 316 | } |
| 317 | /* We used the IPv4-only gethostbyname()... */ |
| 318 | else |
| 319 | #endif |
| 320 | { |
| 321 | memcpy(&a, h->h_addr, sizeof(a)); |
| 322 | /* This way we are always sure the h->h_name is valid :) */ |
| 323 | strncpy(realhost, h->h_name, sizeof(realhost)); |
| 324 | } |
| 325 | } |
| 326 | #ifdef IPV6 |
| 327 | FreeLibrary(dllWSHIP6); |
| 328 | #endif |
| 329 | } else { |
| 330 | /* |
| 331 | * This must be a numeric IPv4 address because it caused a |
| 332 | * success return from inet_addr. |
| 333 | */ |
| 334 | ret->family = AF_INET; |
| 335 | strncpy(realhost, host, sizeof(realhost)); |
| 336 | } |
| 337 | ret->address = ntohl(a); |
| 338 | realhost[lenof(realhost)-1] = '\0'; |
| 339 | *canonicalname = smalloc(1+strlen(realhost)); |
| 340 | strcpy(*canonicalname, realhost); |
| 341 | return ret; |
| 342 | } |
| 343 | |
| 344 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
| 345 | { |
| 346 | #ifdef IPV6 |
| 347 | if (addr->family == AF_INET) { |
| 348 | #endif |
| 349 | struct in_addr a; |
| 350 | a.s_addr = htonl(addr->address); |
| 351 | strncpy(buf, inet_ntoa(a), buflen); |
| 352 | #ifdef IPV6 |
| 353 | } else { |
| 354 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
| 355 | } |
| 356 | #endif |
| 357 | } |
| 358 | |
| 359 | void sk_addr_free(SockAddr addr) |
| 360 | { |
| 361 | sfree(addr); |
| 362 | } |
| 363 | |
| 364 | static Plug sk_tcp_plug(Socket sock, Plug p) |
| 365 | { |
| 366 | Actual_Socket s = (Actual_Socket) sock; |
| 367 | Plug ret = s->plug; |
| 368 | if (p) |
| 369 | s->plug = p; |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | static void sk_tcp_flush(Socket s) |
| 374 | { |
| 375 | /* |
| 376 | * We send data to the socket as soon as we can anyway, |
| 377 | * so we don't need to do anything here. :-) |
| 378 | */ |
| 379 | } |
| 380 | |
| 381 | static void sk_tcp_close(Socket s); |
| 382 | static int sk_tcp_write(Socket s, char *data, int len); |
| 383 | static int sk_tcp_write_oob(Socket s, char *data, int len); |
| 384 | static char *sk_tcp_socket_error(Socket s); |
| 385 | |
| 386 | extern char *do_select(SOCKET skt, int startup); |
| 387 | |
| 388 | Socket sk_register(void *sock, Plug plug) |
| 389 | { |
| 390 | static struct socket_function_table fn_table = { |
| 391 | sk_tcp_plug, |
| 392 | sk_tcp_close, |
| 393 | sk_tcp_write, |
| 394 | sk_tcp_write_oob, |
| 395 | sk_tcp_flush, |
| 396 | sk_tcp_socket_error |
| 397 | }; |
| 398 | |
| 399 | DWORD err; |
| 400 | char *errstr; |
| 401 | Actual_Socket ret; |
| 402 | |
| 403 | /* |
| 404 | * Create Socket structure. |
| 405 | */ |
| 406 | ret = smalloc(sizeof(struct Socket_tag)); |
| 407 | ret->fn = &fn_table; |
| 408 | ret->error = NULL; |
| 409 | ret->plug = plug; |
| 410 | bufchain_init(&ret->output_data); |
| 411 | ret->writable = 1; /* to start with */ |
| 412 | ret->sending_oob = 0; |
| 413 | ret->frozen = 1; |
| 414 | ret->frozen_readable = 0; |
| 415 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 416 | ret->pending_error = 0; |
| 417 | |
| 418 | ret->s = (SOCKET)sock; |
| 419 | |
| 420 | if (ret->s == INVALID_SOCKET) { |
| 421 | err = WSAGetLastError(); |
| 422 | ret->error = winsock_error_string(err); |
| 423 | return (Socket) ret; |
| 424 | } |
| 425 | |
| 426 | ret->oobinline = 0; |
| 427 | |
| 428 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 429 | * window, or an EventSelect on an event object. */ |
| 430 | errstr = do_select(ret->s, 1); |
| 431 | if (errstr) { |
| 432 | ret->error = errstr; |
| 433 | return (Socket) ret; |
| 434 | } |
| 435 | |
| 436 | add234(sktree, ret); |
| 437 | |
| 438 | return (Socket) ret; |
| 439 | } |
| 440 | |
| 441 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
| 442 | Plug plug) |
| 443 | { |
| 444 | static struct socket_function_table fn_table = { |
| 445 | sk_tcp_plug, |
| 446 | sk_tcp_close, |
| 447 | sk_tcp_write, |
| 448 | sk_tcp_write_oob, |
| 449 | sk_tcp_flush, |
| 450 | sk_tcp_socket_error |
| 451 | }; |
| 452 | |
| 453 | SOCKET s; |
| 454 | #ifdef IPV6 |
| 455 | SOCKADDR_IN6 a6; |
| 456 | #endif |
| 457 | SOCKADDR_IN a; |
| 458 | DWORD err; |
| 459 | char *errstr; |
| 460 | Actual_Socket ret; |
| 461 | short localport; |
| 462 | |
| 463 | /* |
| 464 | * Create Socket structure. |
| 465 | */ |
| 466 | ret = smalloc(sizeof(struct Socket_tag)); |
| 467 | ret->fn = &fn_table; |
| 468 | ret->error = NULL; |
| 469 | ret->plug = plug; |
| 470 | bufchain_init(&ret->output_data); |
| 471 | ret->connected = 0; /* to start with */ |
| 472 | ret->writable = 0; /* to start with */ |
| 473 | ret->sending_oob = 0; |
| 474 | ret->frozen = 0; |
| 475 | ret->frozen_readable = 0; |
| 476 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 477 | ret->pending_error = 0; |
| 478 | |
| 479 | /* |
| 480 | * Open socket. |
| 481 | */ |
| 482 | s = socket(addr->family, SOCK_STREAM, 0); |
| 483 | ret->s = s; |
| 484 | |
| 485 | if (s == INVALID_SOCKET) { |
| 486 | err = WSAGetLastError(); |
| 487 | ret->error = winsock_error_string(err); |
| 488 | return (Socket) ret; |
| 489 | } |
| 490 | |
| 491 | ret->oobinline = oobinline; |
| 492 | if (oobinline) { |
| 493 | BOOL b = TRUE; |
| 494 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Bind to local address. |
| 499 | */ |
| 500 | if (privport) |
| 501 | localport = 1023; /* count from 1023 downwards */ |
| 502 | else |
| 503 | localport = 0; /* just use port 0 (ie winsock picks) */ |
| 504 | |
| 505 | /* Loop round trying to bind */ |
| 506 | while (1) { |
| 507 | int retcode; |
| 508 | |
| 509 | #ifdef IPV6 |
| 510 | if (addr->family == AF_INET6) { |
| 511 | memset(&a6, 0, sizeof(a6)); |
| 512 | a6.sin6_family = AF_INET6; |
| 513 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
| 514 | a6.sin6_port = htons(localport); |
| 515 | } else |
| 516 | #endif |
| 517 | { |
| 518 | a.sin_family = AF_INET; |
| 519 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
| 520 | a.sin_port = htons(localport); |
| 521 | } |
| 522 | #ifdef IPV6 |
| 523 | retcode = bind(s, (addr->family == AF_INET6 ? |
| 524 | (struct sockaddr *) &a6 : |
| 525 | (struct sockaddr *) &a), |
| 526 | (addr->family == |
| 527 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
| 528 | #else |
| 529 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 530 | #endif |
| 531 | if (retcode != SOCKET_ERROR) { |
| 532 | err = 0; |
| 533 | break; /* done */ |
| 534 | } else { |
| 535 | err = WSAGetLastError(); |
| 536 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
| 537 | break; |
| 538 | } |
| 539 | |
| 540 | if (localport == 0) |
| 541 | break; /* we're only looping once */ |
| 542 | localport--; |
| 543 | if (localport == 0) |
| 544 | break; /* we might have got to the end */ |
| 545 | } |
| 546 | |
| 547 | if (err) { |
| 548 | ret->error = winsock_error_string(err); |
| 549 | return (Socket) ret; |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Connect to remote address. |
| 554 | */ |
| 555 | #ifdef IPV6 |
| 556 | if (addr->family == AF_INET6) { |
| 557 | memset(&a, 0, sizeof(a)); |
| 558 | a6.sin6_family = AF_INET6; |
| 559 | a6.sin6_port = htons((short) port); |
| 560 | a6.sin6_addr = |
| 561 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
| 562 | } else |
| 563 | #endif |
| 564 | { |
| 565 | a.sin_family = AF_INET; |
| 566 | a.sin_addr.s_addr = htonl(addr->address); |
| 567 | a.sin_port = htons((short) port); |
| 568 | } |
| 569 | |
| 570 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 571 | * window, or an EventSelect on an event object. */ |
| 572 | errstr = do_select(s, 1); |
| 573 | if (errstr) { |
| 574 | ret->error = errstr; |
| 575 | return (Socket) ret; |
| 576 | } |
| 577 | |
| 578 | if (( |
| 579 | #ifdef IPV6 |
| 580 | connect(s, ((addr->family == AF_INET6) ? |
| 581 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
| 582 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
| 583 | #else |
| 584 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
| 585 | #endif |
| 586 | ) == SOCKET_ERROR) { |
| 587 | err = WSAGetLastError(); |
| 588 | /* |
| 589 | * We expect a potential EWOULDBLOCK here, because the |
| 590 | * chances are the front end has done a select for |
| 591 | * FD_CONNECT, so that connect() will complete |
| 592 | * asynchronously. |
| 593 | */ |
| 594 | if ( err != WSAEWOULDBLOCK ) { |
| 595 | ret->error = winsock_error_string(err); |
| 596 | return (Socket) ret; |
| 597 | } |
| 598 | } else { |
| 599 | /* |
| 600 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
| 601 | * and we should set the socket as writable. |
| 602 | */ |
| 603 | ret->writable = 1; |
| 604 | } |
| 605 | |
| 606 | add234(sktree, ret); |
| 607 | |
| 608 | return (Socket) ret; |
| 609 | } |
| 610 | |
| 611 | Socket sk_newlistener(int port, Plug plug, int local_host_only) |
| 612 | { |
| 613 | static struct socket_function_table fn_table = { |
| 614 | sk_tcp_plug, |
| 615 | sk_tcp_close, |
| 616 | sk_tcp_write, |
| 617 | sk_tcp_write_oob, |
| 618 | sk_tcp_flush, |
| 619 | sk_tcp_socket_error |
| 620 | }; |
| 621 | |
| 622 | SOCKET s; |
| 623 | #ifdef IPV6 |
| 624 | SOCKADDR_IN6 a6; |
| 625 | #endif |
| 626 | SOCKADDR_IN a; |
| 627 | DWORD err; |
| 628 | char *errstr; |
| 629 | Actual_Socket ret; |
| 630 | int retcode; |
| 631 | int on = 1; |
| 632 | |
| 633 | /* |
| 634 | * Create Socket structure. |
| 635 | */ |
| 636 | ret = smalloc(sizeof(struct Socket_tag)); |
| 637 | ret->fn = &fn_table; |
| 638 | ret->error = NULL; |
| 639 | ret->plug = plug; |
| 640 | bufchain_init(&ret->output_data); |
| 641 | ret->writable = 0; /* to start with */ |
| 642 | ret->sending_oob = 0; |
| 643 | ret->frozen = 0; |
| 644 | ret->frozen_readable = 0; |
| 645 | ret->localhost_only = local_host_only; |
| 646 | ret->pending_error = 0; |
| 647 | |
| 648 | /* |
| 649 | * Open socket. |
| 650 | */ |
| 651 | s = socket(AF_INET, SOCK_STREAM, 0); |
| 652 | ret->s = s; |
| 653 | |
| 654 | if (s == INVALID_SOCKET) { |
| 655 | err = WSAGetLastError(); |
| 656 | ret->error = winsock_error_string(err); |
| 657 | return (Socket) ret; |
| 658 | } |
| 659 | |
| 660 | ret->oobinline = 0; |
| 661 | |
| 662 | |
| 663 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
| 664 | |
| 665 | |
| 666 | #ifdef IPV6 |
| 667 | if (addr->family == AF_INET6) { |
| 668 | memset(&a6, 0, sizeof(a6)); |
| 669 | a6.sin6_family = AF_INET6; |
| 670 | if (local_host_only) |
| 671 | a6.sin6_addr = in6addr_loopback; |
| 672 | else |
| 673 | a6.sin6_addr = in6addr_any; |
| 674 | a6.sin6_port = htons(port); |
| 675 | } else |
| 676 | #endif |
| 677 | { |
| 678 | a.sin_family = AF_INET; |
| 679 | if (local_host_only) |
| 680 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 681 | else |
| 682 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
| 683 | a.sin_port = htons((short)port); |
| 684 | } |
| 685 | #ifdef IPV6 |
| 686 | retcode = bind(s, (addr->family == AF_INET6 ? |
| 687 | (struct sockaddr *) &a6 : |
| 688 | (struct sockaddr *) &a), |
| 689 | (addr->family == |
| 690 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
| 691 | #else |
| 692 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 693 | #endif |
| 694 | if (retcode != SOCKET_ERROR) { |
| 695 | err = 0; |
| 696 | } else { |
| 697 | err = WSAGetLastError(); |
| 698 | } |
| 699 | |
| 700 | if (err) { |
| 701 | ret->error = winsock_error_string(err); |
| 702 | return (Socket) ret; |
| 703 | } |
| 704 | |
| 705 | |
| 706 | if (listen(s, SOMAXCONN) == SOCKET_ERROR) { |
| 707 | closesocket(s); |
| 708 | ret->error = winsock_error_string(err); |
| 709 | return (Socket) ret; |
| 710 | } |
| 711 | |
| 712 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 713 | * window, or an EventSelect on an event object. */ |
| 714 | errstr = do_select(s, 1); |
| 715 | if (errstr) { |
| 716 | ret->error = errstr; |
| 717 | return (Socket) ret; |
| 718 | } |
| 719 | |
| 720 | add234(sktree, ret); |
| 721 | |
| 722 | return (Socket) ret; |
| 723 | } |
| 724 | |
| 725 | static void sk_tcp_close(Socket sock) |
| 726 | { |
| 727 | extern char *do_select(SOCKET skt, int startup); |
| 728 | Actual_Socket s = (Actual_Socket) sock; |
| 729 | |
| 730 | del234(sktree, s); |
| 731 | do_select(s->s, 0); |
| 732 | closesocket(s->s); |
| 733 | sfree(s); |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * The function which tries to send on a socket once it's deemed |
| 738 | * writable. |
| 739 | */ |
| 740 | void try_send(Actual_Socket s) |
| 741 | { |
| 742 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
| 743 | int nsent; |
| 744 | DWORD err; |
| 745 | void *data; |
| 746 | int len, urgentflag; |
| 747 | |
| 748 | if (s->sending_oob) { |
| 749 | urgentflag = MSG_OOB; |
| 750 | len = s->sending_oob; |
| 751 | data = &s->oobdata; |
| 752 | } else { |
| 753 | urgentflag = 0; |
| 754 | bufchain_prefix(&s->output_data, &data, &len); |
| 755 | } |
| 756 | nsent = send(s->s, data, len, urgentflag); |
| 757 | noise_ultralight(nsent); |
| 758 | if (nsent <= 0) { |
| 759 | err = (nsent < 0 ? WSAGetLastError() : 0); |
| 760 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
| 761 | /* |
| 762 | * Perfectly normal: we've sent all we can for the moment. |
| 763 | * |
| 764 | * (Some WinSock send() implementations can return |
| 765 | * <0 but leave no sensible error indication - |
| 766 | * WSAGetLastError() is called but returns zero or |
| 767 | * a small number - so we check that case and treat |
| 768 | * it just like WSAEWOULDBLOCK.) |
| 769 | */ |
| 770 | s->writable = FALSE; |
| 771 | return; |
| 772 | } else if (nsent == 0 || |
| 773 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
| 774 | /* |
| 775 | * If send() returns CONNABORTED or CONNRESET, we |
| 776 | * unfortunately can't just call plug_closing(), |
| 777 | * because it's quite likely that we're currently |
| 778 | * _in_ a call from the code we'd be calling back |
| 779 | * to, so we'd have to make half the SSH code |
| 780 | * reentrant. Instead we flag a pending error on |
| 781 | * the socket, to be dealt with (by calling |
| 782 | * plug_closing()) at some suitable future moment. |
| 783 | */ |
| 784 | s->pending_error = err; |
| 785 | return; |
| 786 | } else { |
| 787 | fatalbox(winsock_error_string(err)); |
| 788 | } |
| 789 | } else { |
| 790 | if (s->sending_oob) { |
| 791 | if (nsent < len) { |
| 792 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
| 793 | s->sending_oob = len - nsent; |
| 794 | } else { |
| 795 | s->sending_oob = 0; |
| 796 | } |
| 797 | } else { |
| 798 | bufchain_consume(&s->output_data, nsent); |
| 799 | } |
| 800 | } |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | static int sk_tcp_write(Socket sock, char *buf, int len) |
| 805 | { |
| 806 | Actual_Socket s = (Actual_Socket) sock; |
| 807 | |
| 808 | /* |
| 809 | * Add the data to the buffer list on the socket. |
| 810 | */ |
| 811 | bufchain_add(&s->output_data, buf, len); |
| 812 | |
| 813 | /* |
| 814 | * Now try sending from the start of the buffer list. |
| 815 | */ |
| 816 | if (s->writable) |
| 817 | try_send(s); |
| 818 | |
| 819 | return bufchain_size(&s->output_data); |
| 820 | } |
| 821 | |
| 822 | static int sk_tcp_write_oob(Socket sock, char *buf, int len) |
| 823 | { |
| 824 | Actual_Socket s = (Actual_Socket) sock; |
| 825 | |
| 826 | /* |
| 827 | * Replace the buffer list on the socket with the data. |
| 828 | */ |
| 829 | bufchain_clear(&s->output_data); |
| 830 | assert(len <= sizeof(s->oobdata)); |
| 831 | memcpy(s->oobdata, buf, len); |
| 832 | s->sending_oob = len; |
| 833 | |
| 834 | /* |
| 835 | * Now try sending from the start of the buffer list. |
| 836 | */ |
| 837 | if (s->writable) |
| 838 | try_send(s); |
| 839 | |
| 840 | return s->sending_oob; |
| 841 | } |
| 842 | |
| 843 | int select_result(WPARAM wParam, LPARAM lParam) |
| 844 | { |
| 845 | int ret, open; |
| 846 | DWORD err; |
| 847 | char buf[20480]; /* nice big buffer for plenty of speed */ |
| 848 | Actual_Socket s; |
| 849 | u_long atmark; |
| 850 | |
| 851 | /* wParam is the socket itself */ |
| 852 | s = find234(sktree, (void *) wParam, cmpforsearch); |
| 853 | if (!s) |
| 854 | return 1; /* boggle */ |
| 855 | |
| 856 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
| 857 | /* |
| 858 | * An error has occurred on this socket. Pass it to the |
| 859 | * plug. |
| 860 | */ |
| 861 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
| 862 | } |
| 863 | |
| 864 | noise_ultralight(lParam); |
| 865 | |
| 866 | switch (WSAGETSELECTEVENT(lParam)) { |
| 867 | case FD_CONNECT: |
| 868 | s->connected = s->writable = 1; |
| 869 | break; |
| 870 | case FD_READ: |
| 871 | /* In the case the socket is still frozen, we don't even bother */ |
| 872 | if (s->frozen) { |
| 873 | s->frozen_readable = 1; |
| 874 | break; |
| 875 | } |
| 876 | |
| 877 | /* |
| 878 | * We have received data on the socket. For an oobinline |
| 879 | * socket, this might be data _before_ an urgent pointer, |
| 880 | * in which case we send it to the back end with type==1 |
| 881 | * (data prior to urgent). |
| 882 | */ |
| 883 | if (s->oobinline) { |
| 884 | atmark = 1; |
| 885 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
| 886 | /* |
| 887 | * Avoid checking the return value from ioctlsocket(), |
| 888 | * on the grounds that some WinSock wrappers don't |
| 889 | * support it. If it does nothing, we get atmark==1, |
| 890 | * which is equivalent to `no OOB pending', so the |
| 891 | * effect will be to non-OOB-ify any OOB data. |
| 892 | */ |
| 893 | } else |
| 894 | atmark = 1; |
| 895 | |
| 896 | ret = recv(s->s, buf, sizeof(buf), 0); |
| 897 | noise_ultralight(ret); |
| 898 | if (ret < 0) { |
| 899 | err = WSAGetLastError(); |
| 900 | if (err == WSAEWOULDBLOCK) { |
| 901 | break; |
| 902 | } |
| 903 | } |
| 904 | if (ret < 0) { |
| 905 | return plug_closing(s->plug, winsock_error_string(err), err, |
| 906 | 0); |
| 907 | } else if (0 == ret) { |
| 908 | return plug_closing(s->plug, NULL, 0, 0); |
| 909 | } else { |
| 910 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
| 911 | } |
| 912 | break; |
| 913 | case FD_OOB: |
| 914 | /* |
| 915 | * This will only happen on a non-oobinline socket. It |
| 916 | * indicates that we can immediately perform an OOB read |
| 917 | * and get back OOB data, which we will send to the back |
| 918 | * end with type==2 (urgent data). |
| 919 | */ |
| 920 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
| 921 | noise_ultralight(ret); |
| 922 | if (ret <= 0) { |
| 923 | fatalbox(ret == 0 ? "Internal networking trouble" : |
| 924 | winsock_error_string(WSAGetLastError())); |
| 925 | } else { |
| 926 | return plug_receive(s->plug, 2, buf, ret); |
| 927 | } |
| 928 | break; |
| 929 | case FD_WRITE: |
| 930 | { |
| 931 | int bufsize_before, bufsize_after; |
| 932 | s->writable = 1; |
| 933 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
| 934 | try_send(s); |
| 935 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
| 936 | if (bufsize_after < bufsize_before) |
| 937 | plug_sent(s->plug, bufsize_after); |
| 938 | } |
| 939 | break; |
| 940 | case FD_CLOSE: |
| 941 | /* Signal a close on the socket. First read any outstanding data. */ |
| 942 | open = 1; |
| 943 | do { |
| 944 | ret = recv(s->s, buf, sizeof(buf), 0); |
| 945 | if (ret < 0) { |
| 946 | err = WSAGetLastError(); |
| 947 | if (err == WSAEWOULDBLOCK) |
| 948 | break; |
| 949 | return plug_closing(s->plug, winsock_error_string(err), |
| 950 | err, 0); |
| 951 | } else { |
| 952 | if (ret) |
| 953 | open &= plug_receive(s->plug, 0, buf, ret); |
| 954 | else |
| 955 | open &= plug_closing(s->plug, NULL, 0, 0); |
| 956 | } |
| 957 | } while (ret > 0); |
| 958 | return open; |
| 959 | case FD_ACCEPT: |
| 960 | { |
| 961 | struct sockaddr_in isa; |
| 962 | int addrlen = sizeof(struct sockaddr_in); |
| 963 | SOCKET t; /* socket of connection */ |
| 964 | |
| 965 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
| 966 | err = 0; |
| 967 | t = accept(s->s,&isa,&addrlen); |
| 968 | if (t == INVALID_SOCKET) |
| 969 | { |
| 970 | err = WSAGetLastError(); |
| 971 | if (err == WSATRY_AGAIN) |
| 972 | break; |
| 973 | } |
| 974 | |
| 975 | if (s->localhost_only && |
| 976 | ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) { |
| 977 | closesocket(t); /* dodgy WinSock let nonlocal through */ |
| 978 | } else if (plug_accepting(s->plug, (void*)t)) { |
| 979 | closesocket(t); /* denied or error */ |
| 980 | } |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | return 1; |
| 985 | } |
| 986 | |
| 987 | /* |
| 988 | * Deal with socket errors detected in try_send(). |
| 989 | */ |
| 990 | void net_pending_errors(void) |
| 991 | { |
| 992 | int i; |
| 993 | Actual_Socket s; |
| 994 | |
| 995 | /* |
| 996 | * This might be a fiddly business, because it's just possible |
| 997 | * that handling a pending error on one socket might cause |
| 998 | * others to be closed. (I can't think of any reason this might |
| 999 | * happen in current SSH implementation, but to maintain |
| 1000 | * generality of this network layer I'll assume the worst.) |
| 1001 | * |
| 1002 | * So what we'll do is search the socket list for _one_ socket |
| 1003 | * with a pending error, and then handle it, and then search |
| 1004 | * the list again _from the beginning_. Repeat until we make a |
| 1005 | * pass with no socket errors present. That way we are |
| 1006 | * protected against the socket list changing under our feet. |
| 1007 | */ |
| 1008 | |
| 1009 | do { |
| 1010 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 1011 | if (s->pending_error) { |
| 1012 | /* |
| 1013 | * An error has occurred on this socket. Pass it to the |
| 1014 | * plug. |
| 1015 | */ |
| 1016 | plug_closing(s->plug, |
| 1017 | winsock_error_string(s->pending_error), |
| 1018 | s->pending_error, 0); |
| 1019 | break; |
| 1020 | } |
| 1021 | } |
| 1022 | } while (s); |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * Each socket abstraction contains a `void *' private field in |
| 1027 | * which the client can keep state. |
| 1028 | */ |
| 1029 | void sk_set_private_ptr(Socket sock, void *ptr) |
| 1030 | { |
| 1031 | Actual_Socket s = (Actual_Socket) sock; |
| 1032 | s->private_ptr = ptr; |
| 1033 | } |
| 1034 | |
| 1035 | void *sk_get_private_ptr(Socket sock) |
| 1036 | { |
| 1037 | Actual_Socket s = (Actual_Socket) sock; |
| 1038 | return s->private_ptr; |
| 1039 | } |
| 1040 | |
| 1041 | /* |
| 1042 | * Special error values are returned from sk_namelookup and sk_new |
| 1043 | * if there's a problem. These functions extract an error message, |
| 1044 | * or return NULL if there's no problem. |
| 1045 | */ |
| 1046 | char *sk_addr_error(SockAddr addr) |
| 1047 | { |
| 1048 | return addr->error; |
| 1049 | } |
| 1050 | static char *sk_tcp_socket_error(Socket sock) |
| 1051 | { |
| 1052 | Actual_Socket s = (Actual_Socket) sock; |
| 1053 | return s->error; |
| 1054 | } |
| 1055 | |
| 1056 | void sk_set_frozen(Socket sock, int is_frozen) |
| 1057 | { |
| 1058 | Actual_Socket s = (Actual_Socket) sock; |
| 1059 | if (s->frozen == is_frozen) |
| 1060 | return; |
| 1061 | s->frozen = is_frozen; |
| 1062 | if (!is_frozen && s->frozen_readable) { |
| 1063 | char c; |
| 1064 | recv(s->s, &c, 1, MSG_PEEK); |
| 1065 | } |
| 1066 | s->frozen_readable = 0; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * For Plink: enumerate all sockets currently active. |
| 1071 | */ |
| 1072 | SOCKET first_socket(int *state) |
| 1073 | { |
| 1074 | Actual_Socket s; |
| 1075 | *state = 0; |
| 1076 | s = index234(sktree, (*state)++); |
| 1077 | return s ? s->s : INVALID_SOCKET; |
| 1078 | } |
| 1079 | |
| 1080 | SOCKET next_socket(int *state) |
| 1081 | { |
| 1082 | Actual_Socket s = index234(sktree, (*state)++); |
| 1083 | return s ? s->s : INVALID_SOCKET; |
| 1084 | } |