| 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 | struct Socket_tag { |
| 38 | const struct socket_function_table *fn; |
| 39 | /* the above variable absolutely *must* be the first in this structure */ |
| 40 | char *error; |
| 41 | SOCKET s; |
| 42 | Plug plug; |
| 43 | void *private_ptr; |
| 44 | bufchain output_data; |
| 45 | int connected; |
| 46 | int writable; |
| 47 | int frozen; /* this causes readability notifications to be ignored */ |
| 48 | int frozen_readable; /* this means we missed at least one readability |
| 49 | * notification while we were frozen */ |
| 50 | int localhost_only; /* for listening sockets */ |
| 51 | char oobdata[1]; |
| 52 | int sending_oob; |
| 53 | int oobinline, nodelay, keepalive, privport; |
| 54 | SockAddr addr; |
| 55 | int port; |
| 56 | int pending_error; /* in case send() returns error */ |
| 57 | /* |
| 58 | * We sometimes need pairs of Socket structures to be linked: |
| 59 | * if we are listening on the same IPv6 and v4 port, for |
| 60 | * example. So here we define `parent' and `child' pointers to |
| 61 | * track this link. |
| 62 | */ |
| 63 | Actual_Socket parent, child; |
| 64 | }; |
| 65 | |
| 66 | struct SockAddr_tag { |
| 67 | char *error; |
| 68 | /* |
| 69 | * Which address family this address belongs to. AF_INET for |
| 70 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
| 71 | * resolution has not been done and a simple host name is held |
| 72 | * in this SockAddr structure. |
| 73 | * The hostname field is also used when the hostname has both |
| 74 | * an IPv6 and IPv4 address and the IPv6 connection attempt |
| 75 | * fails. We then try the IPv4 address. |
| 76 | * This 'family' should become an option in the GUI and |
| 77 | * on the commandline for selecting a default protocol. |
| 78 | */ |
| 79 | int family; |
| 80 | #ifndef NO_IPV6 |
| 81 | struct addrinfo *ais; /* Addresses IPv6 style. */ |
| 82 | struct addrinfo *ai; /* steps along the linked list */ |
| 83 | #endif |
| 84 | unsigned long *addresses; /* Addresses IPv4 style. */ |
| 85 | int naddresses, curraddr; |
| 86 | char hostname[512]; /* Store an unresolved host name. */ |
| 87 | }; |
| 88 | |
| 89 | static tree234 *sktree; |
| 90 | |
| 91 | static int cmpfortree(void *av, void *bv) |
| 92 | { |
| 93 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
| 94 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
| 95 | if (as < bs) |
| 96 | return -1; |
| 97 | if (as > bs) |
| 98 | return +1; |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static int cmpforsearch(void *av, void *bv) |
| 103 | { |
| 104 | Actual_Socket b = (Actual_Socket) bv; |
| 105 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
| 106 | if (as < bs) |
| 107 | return -1; |
| 108 | if (as > bs) |
| 109 | return +1; |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | #define NOTHING |
| 114 | #define DECL_WINSOCK_FUNCTION(linkage, rettype, name, params) \ |
| 115 | typedef rettype (WINAPI *t_##name) params; \ |
| 116 | linkage t_##name p_##name |
| 117 | #define GET_WINSOCK_FUNCTION(module, name) \ |
| 118 | p_##name = (t_##name) GetProcAddress(module, #name) |
| 119 | |
| 120 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAAsyncSelect, |
| 121 | (SOCKET, HWND, u_int, long)); |
| 122 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEventSelect, (SOCKET, WSAEVENT, long)); |
| 123 | DECL_WINSOCK_FUNCTION(NOTHING, int, select, |
| 124 | (int, fd_set FAR *, fd_set FAR *, |
| 125 | fd_set FAR *, const struct timeval FAR *)); |
| 126 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAGetLastError, (void)); |
| 127 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEnumNetworkEvents, |
| 128 | (SOCKET, WSAEVENT, LPWSANETWORKEVENTS)); |
| 129 | DECL_WINSOCK_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA)); |
| 130 | DECL_WINSOCK_FUNCTION(static, int, WSACleanup, (void)); |
| 131 | DECL_WINSOCK_FUNCTION(static, int, closesocket, (SOCKET)); |
| 132 | DECL_WINSOCK_FUNCTION(static, u_long, ntohl, (u_long)); |
| 133 | DECL_WINSOCK_FUNCTION(static, u_long, htonl, (u_long)); |
| 134 | DECL_WINSOCK_FUNCTION(static, u_short, htons, (u_short)); |
| 135 | DECL_WINSOCK_FUNCTION(static, u_short, ntohs, (u_short)); |
| 136 | DECL_WINSOCK_FUNCTION(static, struct hostent FAR *, gethostbyname, |
| 137 | (const char FAR *)); |
| 138 | DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname, |
| 139 | (const char FAR *, const char FAR *)); |
| 140 | DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *)); |
| 141 | DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr)); |
| 142 | DECL_WINSOCK_FUNCTION(static, int, connect, |
| 143 | (SOCKET, const struct sockaddr FAR *, int)); |
| 144 | DECL_WINSOCK_FUNCTION(static, int, bind, |
| 145 | (SOCKET, const struct sockaddr FAR *, int)); |
| 146 | DECL_WINSOCK_FUNCTION(static, int, setsockopt, |
| 147 | (SOCKET, int, int, const char FAR *, int)); |
| 148 | DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int)); |
| 149 | DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int)); |
| 150 | DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int)); |
| 151 | DECL_WINSOCK_FUNCTION(static, int, ioctlsocket, |
| 152 | (SOCKET, long, u_long FAR *)); |
| 153 | DECL_WINSOCK_FUNCTION(static, SOCKET, accept, |
| 154 | (SOCKET, struct sockaddr FAR *, int FAR *)); |
| 155 | DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int)); |
| 156 | DECL_WINSOCK_FUNCTION(static, int, WSAIoctl, |
| 157 | (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD, |
| 158 | LPDWORD, LPWSAOVERLAPPED, |
| 159 | LPWSAOVERLAPPED_COMPLETION_ROUTINE)); |
| 160 | #ifndef NO_IPV6 |
| 161 | DECL_WINSOCK_FUNCTION(static, int, getaddrinfo, |
| 162 | (const char *nodename, const char *servname, |
| 163 | const struct addrinfo *hints, struct addrinfo **res)); |
| 164 | DECL_WINSOCK_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res)); |
| 165 | DECL_WINSOCK_FUNCTION(static, int, getnameinfo, |
| 166 | (const struct sockaddr FAR * sa, socklen_t salen, |
| 167 | char FAR * host, size_t hostlen, char FAR * serv, |
| 168 | size_t servlen, int flags)); |
| 169 | #endif |
| 170 | |
| 171 | static HMODULE winsock_module; |
| 172 | #ifndef NO_IPV6 |
| 173 | static HMODULE wship6_module; |
| 174 | #endif |
| 175 | |
| 176 | void sk_init(void) |
| 177 | { |
| 178 | WORD winsock_ver; |
| 179 | WSADATA wsadata; |
| 180 | |
| 181 | winsock_ver = MAKEWORD(2, 0); |
| 182 | winsock_module = LoadLibrary("WS2_32.DLL"); |
| 183 | if (!winsock_module) { |
| 184 | winsock_module = LoadLibrary("WSOCK32.DLL"); |
| 185 | winsock_ver = MAKEWORD(1, 1); |
| 186 | } |
| 187 | if (!winsock_module) |
| 188 | fatalbox("Unable to load any WinSock library"); |
| 189 | |
| 190 | #ifndef NO_IPV6 |
| 191 | wship6_module = LoadLibrary("wship6.dll"); |
| 192 | if (wship6_module) { |
| 193 | GET_WINSOCK_FUNCTION(wship6_module, getaddrinfo); |
| 194 | GET_WINSOCK_FUNCTION(wship6_module, freeaddrinfo); |
| 195 | GET_WINSOCK_FUNCTION(wship6_module, getnameinfo); |
| 196 | } |
| 197 | #endif |
| 198 | |
| 199 | GET_WINSOCK_FUNCTION(winsock_module, WSAAsyncSelect); |
| 200 | GET_WINSOCK_FUNCTION(winsock_module, WSAEventSelect); |
| 201 | GET_WINSOCK_FUNCTION(winsock_module, select); |
| 202 | GET_WINSOCK_FUNCTION(winsock_module, WSAGetLastError); |
| 203 | GET_WINSOCK_FUNCTION(winsock_module, WSAEnumNetworkEvents); |
| 204 | GET_WINSOCK_FUNCTION(winsock_module, WSAStartup); |
| 205 | GET_WINSOCK_FUNCTION(winsock_module, WSACleanup); |
| 206 | GET_WINSOCK_FUNCTION(winsock_module, closesocket); |
| 207 | GET_WINSOCK_FUNCTION(winsock_module, ntohl); |
| 208 | GET_WINSOCK_FUNCTION(winsock_module, htonl); |
| 209 | GET_WINSOCK_FUNCTION(winsock_module, htons); |
| 210 | GET_WINSOCK_FUNCTION(winsock_module, ntohs); |
| 211 | GET_WINSOCK_FUNCTION(winsock_module, gethostbyname); |
| 212 | GET_WINSOCK_FUNCTION(winsock_module, getservbyname); |
| 213 | GET_WINSOCK_FUNCTION(winsock_module, inet_addr); |
| 214 | GET_WINSOCK_FUNCTION(winsock_module, inet_ntoa); |
| 215 | GET_WINSOCK_FUNCTION(winsock_module, connect); |
| 216 | GET_WINSOCK_FUNCTION(winsock_module, bind); |
| 217 | GET_WINSOCK_FUNCTION(winsock_module, setsockopt); |
| 218 | GET_WINSOCK_FUNCTION(winsock_module, socket); |
| 219 | GET_WINSOCK_FUNCTION(winsock_module, listen); |
| 220 | GET_WINSOCK_FUNCTION(winsock_module, send); |
| 221 | GET_WINSOCK_FUNCTION(winsock_module, ioctlsocket); |
| 222 | GET_WINSOCK_FUNCTION(winsock_module, accept); |
| 223 | GET_WINSOCK_FUNCTION(winsock_module, recv); |
| 224 | GET_WINSOCK_FUNCTION(winsock_module, WSAIoctl); |
| 225 | |
| 226 | if (p_WSAStartup(winsock_ver, &wsadata)) { |
| 227 | fatalbox("Unable to initialise WinSock"); |
| 228 | } |
| 229 | if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) { |
| 230 | p_WSACleanup(); |
| 231 | fatalbox("WinSock version is incompatible with %d.%d", |
| 232 | LOBYTE(winsock_ver), HIBYTE(winsock_ver)); |
| 233 | } |
| 234 | |
| 235 | sktree = newtree234(cmpfortree); |
| 236 | } |
| 237 | |
| 238 | void sk_cleanup(void) |
| 239 | { |
| 240 | Actual_Socket s; |
| 241 | int i; |
| 242 | |
| 243 | if (sktree) { |
| 244 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 245 | p_closesocket(s->s); |
| 246 | } |
| 247 | freetree234(sktree); |
| 248 | sktree = NULL; |
| 249 | } |
| 250 | |
| 251 | p_WSACleanup(); |
| 252 | if (winsock_module) |
| 253 | FreeLibrary(winsock_module); |
| 254 | #ifndef NO_IPV6 |
| 255 | if (wship6_module) |
| 256 | FreeLibrary(wship6_module); |
| 257 | #endif |
| 258 | } |
| 259 | |
| 260 | char *winsock_error_string(int error) |
| 261 | { |
| 262 | switch (error) { |
| 263 | case WSAEACCES: |
| 264 | return "Network error: Permission denied"; |
| 265 | case WSAEADDRINUSE: |
| 266 | return "Network error: Address already in use"; |
| 267 | case WSAEADDRNOTAVAIL: |
| 268 | return "Network error: Cannot assign requested address"; |
| 269 | case WSAEAFNOSUPPORT: |
| 270 | return |
| 271 | "Network error: Address family not supported by protocol family"; |
| 272 | case WSAEALREADY: |
| 273 | return "Network error: Operation already in progress"; |
| 274 | case WSAECONNABORTED: |
| 275 | return "Network error: Software caused connection abort"; |
| 276 | case WSAECONNREFUSED: |
| 277 | return "Network error: Connection refused"; |
| 278 | case WSAECONNRESET: |
| 279 | return "Network error: Connection reset by peer"; |
| 280 | case WSAEDESTADDRREQ: |
| 281 | return "Network error: Destination address required"; |
| 282 | case WSAEFAULT: |
| 283 | return "Network error: Bad address"; |
| 284 | case WSAEHOSTDOWN: |
| 285 | return "Network error: Host is down"; |
| 286 | case WSAEHOSTUNREACH: |
| 287 | return "Network error: No route to host"; |
| 288 | case WSAEINPROGRESS: |
| 289 | return "Network error: Operation now in progress"; |
| 290 | case WSAEINTR: |
| 291 | return "Network error: Interrupted function call"; |
| 292 | case WSAEINVAL: |
| 293 | return "Network error: Invalid argument"; |
| 294 | case WSAEISCONN: |
| 295 | return "Network error: Socket is already connected"; |
| 296 | case WSAEMFILE: |
| 297 | return "Network error: Too many open files"; |
| 298 | case WSAEMSGSIZE: |
| 299 | return "Network error: Message too long"; |
| 300 | case WSAENETDOWN: |
| 301 | return "Network error: Network is down"; |
| 302 | case WSAENETRESET: |
| 303 | return "Network error: Network dropped connection on reset"; |
| 304 | case WSAENETUNREACH: |
| 305 | return "Network error: Network is unreachable"; |
| 306 | case WSAENOBUFS: |
| 307 | return "Network error: No buffer space available"; |
| 308 | case WSAENOPROTOOPT: |
| 309 | return "Network error: Bad protocol option"; |
| 310 | case WSAENOTCONN: |
| 311 | return "Network error: Socket is not connected"; |
| 312 | case WSAENOTSOCK: |
| 313 | return "Network error: Socket operation on non-socket"; |
| 314 | case WSAEOPNOTSUPP: |
| 315 | return "Network error: Operation not supported"; |
| 316 | case WSAEPFNOSUPPORT: |
| 317 | return "Network error: Protocol family not supported"; |
| 318 | case WSAEPROCLIM: |
| 319 | return "Network error: Too many processes"; |
| 320 | case WSAEPROTONOSUPPORT: |
| 321 | return "Network error: Protocol not supported"; |
| 322 | case WSAEPROTOTYPE: |
| 323 | return "Network error: Protocol wrong type for socket"; |
| 324 | case WSAESHUTDOWN: |
| 325 | return "Network error: Cannot send after socket shutdown"; |
| 326 | case WSAESOCKTNOSUPPORT: |
| 327 | return "Network error: Socket type not supported"; |
| 328 | case WSAETIMEDOUT: |
| 329 | return "Network error: Connection timed out"; |
| 330 | case WSAEWOULDBLOCK: |
| 331 | return "Network error: Resource temporarily unavailable"; |
| 332 | case WSAEDISCON: |
| 333 | return "Network error: Graceful shutdown in progress"; |
| 334 | default: |
| 335 | return "Unknown network error"; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | SockAddr sk_namelookup(const char *host, char **canonicalname, |
| 340 | int address_family) |
| 341 | { |
| 342 | SockAddr ret = snew(struct SockAddr_tag); |
| 343 | unsigned long a; |
| 344 | struct hostent *h = NULL; |
| 345 | char realhost[8192]; |
| 346 | int ret_family; |
| 347 | int err; |
| 348 | |
| 349 | /* Clear the structure and default to IPv4. */ |
| 350 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 351 | ret->family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
| 352 | #ifndef NO_IPV6 |
| 353 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
| 354 | #endif |
| 355 | AF_UNSPEC); |
| 356 | #ifndef NO_IPV6 |
| 357 | ret->ai = ret->ais = NULL; |
| 358 | #endif |
| 359 | ret_family = AF_UNSPEC; |
| 360 | *realhost = '\0'; |
| 361 | |
| 362 | if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) { |
| 363 | #ifndef NO_IPV6 |
| 364 | /* |
| 365 | * Use getaddrinfo when it's available |
| 366 | */ |
| 367 | if (p_getaddrinfo) { |
| 368 | struct addrinfo hints; |
| 369 | memset(&hints, 0, sizeof(hints)); |
| 370 | hints.ai_family = ret->family; |
| 371 | if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0) |
| 372 | ret_family = ret->ais->ai_family; |
| 373 | ret->ai = ret->ais; |
| 374 | } else |
| 375 | #endif |
| 376 | { |
| 377 | /* |
| 378 | * Otherwise use the IPv4-only gethostbyname... |
| 379 | * (NOTE: we don't use gethostbyname as a fallback!) |
| 380 | */ |
| 381 | if ( (h = p_gethostbyname(host)) ) |
| 382 | ret_family = AF_INET; |
| 383 | else |
| 384 | err = p_WSAGetLastError(); |
| 385 | } |
| 386 | |
| 387 | if (ret_family == AF_UNSPEC) { |
| 388 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
| 389 | err == WSAHOST_NOT_FOUND ? "Host does not exist" : |
| 390 | err == WSATRY_AGAIN ? "Host not found" : |
| 391 | #ifndef NO_IPV6 |
| 392 | p_getaddrinfo ? "getaddrinfo: unknown error" : |
| 393 | #endif |
| 394 | "gethostbyname: unknown error"); |
| 395 | } else { |
| 396 | ret->error = NULL; |
| 397 | ret->family = ret_family; |
| 398 | |
| 399 | #ifndef NO_IPV6 |
| 400 | /* If we got an address info use that... */ |
| 401 | if (ret->ai) { |
| 402 | /* Are we in IPv4 fallback mode? */ |
| 403 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
| 404 | if (ret->family == AF_INET) |
| 405 | memcpy(&a, |
| 406 | (char *) &((SOCKADDR_IN *) ret->ai-> |
| 407 | ai_addr)->sin_addr, sizeof(a)); |
| 408 | |
| 409 | /* Now let's find that canonicalname... */ |
| 410 | if (p_getnameinfo) { |
| 411 | if (p_getnameinfo |
| 412 | ((struct sockaddr *) ret->ai->ai_addr, |
| 413 | ret->family == |
| 414 | AF_INET ? sizeof(SOCKADDR_IN) : |
| 415 | sizeof(SOCKADDR_IN6), realhost, |
| 416 | sizeof(realhost), NULL, 0, 0) != 0) { |
| 417 | strncpy(realhost, host, sizeof(realhost)); |
| 418 | } |
| 419 | } |
| 420 | } |
| 421 | /* We used the IPv4-only gethostbyname()... */ |
| 422 | else |
| 423 | #endif |
| 424 | { |
| 425 | int n; |
| 426 | for (n = 0; h->h_addr_list[n]; n++); |
| 427 | ret->addresses = snewn(n, unsigned long); |
| 428 | ret->naddresses = n; |
| 429 | for (n = 0; n < ret->naddresses; n++) { |
| 430 | memcpy(&a, h->h_addr_list[n], sizeof(a)); |
| 431 | ret->addresses[n] = p_ntohl(a); |
| 432 | } |
| 433 | ret->curraddr = 0; |
| 434 | memcpy(&a, h->h_addr, sizeof(a)); |
| 435 | /* This way we are always sure the h->h_name is valid :) */ |
| 436 | strncpy(realhost, h->h_name, sizeof(realhost)); |
| 437 | } |
| 438 | } |
| 439 | } else { |
| 440 | /* |
| 441 | * This must be a numeric IPv4 address because it caused a |
| 442 | * success return from inet_addr. |
| 443 | */ |
| 444 | ret->addresses = snewn(1, unsigned long); |
| 445 | ret->naddresses = 1; |
| 446 | ret->curraddr = 0; |
| 447 | ret->addresses[0] = p_ntohl(a); |
| 448 | ret->family = AF_INET; |
| 449 | strncpy(realhost, host, sizeof(realhost)); |
| 450 | } |
| 451 | realhost[lenof(realhost)-1] = '\0'; |
| 452 | *canonicalname = snewn(1+strlen(realhost), char); |
| 453 | strcpy(*canonicalname, realhost); |
| 454 | return ret; |
| 455 | } |
| 456 | |
| 457 | SockAddr sk_nonamelookup(const char *host) |
| 458 | { |
| 459 | SockAddr ret = snew(struct SockAddr_tag); |
| 460 | ret->error = NULL; |
| 461 | ret->family = AF_UNSPEC; |
| 462 | #ifndef NO_IPV6 |
| 463 | ret->ai = ret->ais = NULL; |
| 464 | #endif |
| 465 | ret->naddresses = 0; |
| 466 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
| 467 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
| 468 | return ret; |
| 469 | } |
| 470 | |
| 471 | int sk_nextaddr(SockAddr addr) |
| 472 | { |
| 473 | #ifndef NO_IPV6 |
| 474 | if (addr->ai) { |
| 475 | if (addr->ai->ai_next) { |
| 476 | addr->ai = addr->ai->ai_next; |
| 477 | addr->family = addr->ai->ai_family; |
| 478 | return TRUE; |
| 479 | } else |
| 480 | return FALSE; |
| 481 | } |
| 482 | #endif |
| 483 | if (addr->curraddr+1 < addr->naddresses) { |
| 484 | addr->curraddr++; |
| 485 | return TRUE; |
| 486 | } else { |
| 487 | return FALSE; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
| 492 | { |
| 493 | #ifndef NO_IPV6 |
| 494 | if (addr->ai) { |
| 495 | /* Try to get the WSAAddressToStringA() function from wship6.dll */ |
| 496 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
| 497 | * it will fallback to IPv4. */ |
| 498 | typedef int (CALLBACK * FADDRTOSTR) (LPSOCKADDR lpsaAddress, |
| 499 | DWORD dwAddressLength, |
| 500 | LPWSAPROTOCOL_INFO lpProtocolInfo, |
| 501 | OUT LPTSTR lpszAddressString, |
| 502 | IN OUT LPDWORD lpdwAddressStringLength |
| 503 | ); |
| 504 | FADDRTOSTR fAddrToStr = NULL; |
| 505 | |
| 506 | HINSTANCE dllWS2 = LoadLibrary("ws2_32.dll"); |
| 507 | if (dllWS2) { |
| 508 | fAddrToStr = (FADDRTOSTR)GetProcAddress(dllWS2, |
| 509 | "WSAAddressToStringA"); |
| 510 | if (fAddrToStr) { |
| 511 | fAddrToStr(addr->ai->ai_addr, addr->ai->ai_addrlen, |
| 512 | NULL, buf, &buflen); |
| 513 | } |
| 514 | else strncpy(buf, "IPv6", buflen); |
| 515 | FreeLibrary(dllWS2); |
| 516 | } |
| 517 | } else |
| 518 | #endif |
| 519 | if (addr->family == AF_INET) { |
| 520 | struct in_addr a; |
| 521 | assert(addr->addresses && addr->curraddr < addr->naddresses); |
| 522 | a.s_addr = p_htonl(addr->addresses[addr->curraddr]); |
| 523 | strncpy(buf, p_inet_ntoa(a), buflen); |
| 524 | buf[buflen-1] = '\0'; |
| 525 | } else { |
| 526 | strncpy(buf, addr->hostname, buflen); |
| 527 | buf[buflen-1] = '\0'; |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | int sk_hostname_is_local(char *name) |
| 532 | { |
| 533 | return !strcmp(name, "localhost"); |
| 534 | } |
| 535 | |
| 536 | static INTERFACE_INFO local_interfaces[16]; |
| 537 | static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */ |
| 538 | |
| 539 | static int ipv4_is_local_addr(struct in_addr addr) |
| 540 | { |
| 541 | if (ipv4_is_loopback(addr)) |
| 542 | return 1; /* loopback addresses are local */ |
| 543 | if (!n_local_interfaces) { |
| 544 | SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0); |
| 545 | DWORD retbytes; |
| 546 | |
| 547 | if (p_WSAIoctl && |
| 548 | p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0, |
| 549 | local_interfaces, sizeof(local_interfaces), |
| 550 | &retbytes, NULL, NULL) == 0) |
| 551 | n_local_interfaces = retbytes / sizeof(INTERFACE_INFO); |
| 552 | else |
| 553 | logevent(NULL, "Unable to get list of local IP addresses"); |
| 554 | } |
| 555 | if (n_local_interfaces > 0) { |
| 556 | int i; |
| 557 | for (i = 0; i < n_local_interfaces; i++) { |
| 558 | SOCKADDR_IN *address = |
| 559 | (SOCKADDR_IN *)&local_interfaces[i].iiAddress; |
| 560 | if (address->sin_addr.s_addr == addr.s_addr) |
| 561 | return 1; /* this address is local */ |
| 562 | } |
| 563 | } |
| 564 | return 0; /* this address is not local */ |
| 565 | } |
| 566 | |
| 567 | int sk_address_is_local(SockAddr addr) |
| 568 | { |
| 569 | #ifndef NO_IPV6 |
| 570 | if (addr->family == AF_INET6) { |
| 571 | return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)addr->ai->ai_addr); |
| 572 | } else |
| 573 | #endif |
| 574 | if (addr->family == AF_INET) { |
| 575 | struct in_addr a; |
| 576 | assert(addr->addresses && addr->curraddr < addr->naddresses); |
| 577 | a.s_addr = p_htonl(addr->addresses[addr->curraddr]); |
| 578 | return ipv4_is_local_addr(a); |
| 579 | } else { |
| 580 | assert(addr->family == AF_UNSPEC); |
| 581 | return 0; /* we don't know; assume not */ |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | int sk_addrtype(SockAddr addr) |
| 586 | { |
| 587 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
| 588 | #ifndef NO_IPV6 |
| 589 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
| 590 | #endif |
| 591 | ADDRTYPE_NAME); |
| 592 | } |
| 593 | |
| 594 | void sk_addrcopy(SockAddr addr, char *buf) |
| 595 | { |
| 596 | assert(addr->family != AF_UNSPEC); |
| 597 | #ifndef NO_IPV6 |
| 598 | if (addr->ai) { |
| 599 | if (addr->family == AF_INET) |
| 600 | memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr, |
| 601 | sizeof(struct in_addr)); |
| 602 | else if (addr->family == AF_INET6) |
| 603 | memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr, |
| 604 | sizeof(struct in6_addr)); |
| 605 | else |
| 606 | assert(FALSE); |
| 607 | } else |
| 608 | #endif |
| 609 | if (addr->family == AF_INET) { |
| 610 | struct in_addr a; |
| 611 | assert(addr->addresses && addr->curraddr < addr->naddresses); |
| 612 | a.s_addr = p_htonl(addr->addresses[addr->curraddr]); |
| 613 | memcpy(buf, (char*) &a.s_addr, 4); |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | void sk_addr_free(SockAddr addr) |
| 618 | { |
| 619 | #ifndef NO_IPV6 |
| 620 | if (addr->ais && p_freeaddrinfo) |
| 621 | p_freeaddrinfo(addr->ais); |
| 622 | #endif |
| 623 | if (addr->addresses) |
| 624 | sfree(addr->addresses); |
| 625 | sfree(addr); |
| 626 | } |
| 627 | |
| 628 | static Plug sk_tcp_plug(Socket sock, Plug p) |
| 629 | { |
| 630 | Actual_Socket s = (Actual_Socket) sock; |
| 631 | Plug ret = s->plug; |
| 632 | if (p) |
| 633 | s->plug = p; |
| 634 | return ret; |
| 635 | } |
| 636 | |
| 637 | static void sk_tcp_flush(Socket s) |
| 638 | { |
| 639 | /* |
| 640 | * We send data to the socket as soon as we can anyway, |
| 641 | * so we don't need to do anything here. :-) |
| 642 | */ |
| 643 | } |
| 644 | |
| 645 | static void sk_tcp_close(Socket s); |
| 646 | static int sk_tcp_write(Socket s, const char *data, int len); |
| 647 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
| 648 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
| 649 | static void *sk_tcp_get_private_ptr(Socket s); |
| 650 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
| 651 | static const char *sk_tcp_socket_error(Socket s); |
| 652 | |
| 653 | extern char *do_select(SOCKET skt, int startup); |
| 654 | |
| 655 | Socket sk_register(void *sock, Plug plug) |
| 656 | { |
| 657 | static const struct socket_function_table fn_table = { |
| 658 | sk_tcp_plug, |
| 659 | sk_tcp_close, |
| 660 | sk_tcp_write, |
| 661 | sk_tcp_write_oob, |
| 662 | sk_tcp_flush, |
| 663 | sk_tcp_set_private_ptr, |
| 664 | sk_tcp_get_private_ptr, |
| 665 | sk_tcp_set_frozen, |
| 666 | sk_tcp_socket_error |
| 667 | }; |
| 668 | |
| 669 | DWORD err; |
| 670 | char *errstr; |
| 671 | Actual_Socket ret; |
| 672 | |
| 673 | /* |
| 674 | * Create Socket structure. |
| 675 | */ |
| 676 | ret = snew(struct Socket_tag); |
| 677 | ret->fn = &fn_table; |
| 678 | ret->error = NULL; |
| 679 | ret->plug = plug; |
| 680 | bufchain_init(&ret->output_data); |
| 681 | ret->writable = 1; /* to start with */ |
| 682 | ret->sending_oob = 0; |
| 683 | ret->frozen = 1; |
| 684 | ret->frozen_readable = 0; |
| 685 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 686 | ret->pending_error = 0; |
| 687 | ret->parent = ret->child = NULL; |
| 688 | ret->addr = NULL; |
| 689 | |
| 690 | ret->s = (SOCKET)sock; |
| 691 | |
| 692 | if (ret->s == INVALID_SOCKET) { |
| 693 | err = p_WSAGetLastError(); |
| 694 | ret->error = winsock_error_string(err); |
| 695 | return (Socket) ret; |
| 696 | } |
| 697 | |
| 698 | ret->oobinline = 0; |
| 699 | |
| 700 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 701 | * window, or an EventSelect on an event object. */ |
| 702 | errstr = do_select(ret->s, 1); |
| 703 | if (errstr) { |
| 704 | ret->error = errstr; |
| 705 | return (Socket) ret; |
| 706 | } |
| 707 | |
| 708 | add234(sktree, ret); |
| 709 | |
| 710 | return (Socket) ret; |
| 711 | } |
| 712 | |
| 713 | static DWORD try_connect(Actual_Socket sock) |
| 714 | { |
| 715 | SOCKET s; |
| 716 | #ifndef NO_IPV6 |
| 717 | SOCKADDR_IN6 a6; |
| 718 | #endif |
| 719 | SOCKADDR_IN a; |
| 720 | DWORD err; |
| 721 | char *errstr; |
| 722 | short localport; |
| 723 | int family; |
| 724 | |
| 725 | if (sock->s != INVALID_SOCKET) { |
| 726 | do_select(sock->s, 0); |
| 727 | p_closesocket(sock->s); |
| 728 | } |
| 729 | |
| 730 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); |
| 731 | |
| 732 | /* |
| 733 | * Open socket. |
| 734 | */ |
| 735 | #ifndef NO_IPV6 |
| 736 | /* Let's default to IPv6, this shouldn't hurt anybody |
| 737 | * If the stack supports IPv6 it will also allow IPv4 connections. */ |
| 738 | if (sock->addr->ai) { |
| 739 | family = sock->addr->ai->ai_family; |
| 740 | } else |
| 741 | #endif |
| 742 | { |
| 743 | /* Default to IPv4 */ |
| 744 | family = AF_INET; |
| 745 | } |
| 746 | |
| 747 | s = p_socket(family, SOCK_STREAM, 0); |
| 748 | sock->s = s; |
| 749 | |
| 750 | if (s == INVALID_SOCKET) { |
| 751 | err = p_WSAGetLastError(); |
| 752 | sock->error = winsock_error_string(err); |
| 753 | goto ret; |
| 754 | } |
| 755 | |
| 756 | if (sock->oobinline) { |
| 757 | BOOL b = TRUE; |
| 758 | p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
| 759 | } |
| 760 | |
| 761 | if (sock->nodelay) { |
| 762 | BOOL b = TRUE; |
| 763 | p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
| 764 | } |
| 765 | |
| 766 | if (sock->keepalive) { |
| 767 | BOOL b = TRUE; |
| 768 | p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Bind to local address. |
| 773 | */ |
| 774 | if (sock->privport) |
| 775 | localport = 1023; /* count from 1023 downwards */ |
| 776 | else |
| 777 | localport = 0; /* just use port 0 (ie winsock picks) */ |
| 778 | |
| 779 | /* Loop round trying to bind */ |
| 780 | while (1) { |
| 781 | int sockcode; |
| 782 | |
| 783 | #ifndef NO_IPV6 |
| 784 | if (family == AF_INET6) { |
| 785 | memset(&a6, 0, sizeof(a6)); |
| 786 | a6.sin6_family = AF_INET6; |
| 787 | /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */ |
| 788 | a6.sin6_port = p_htons(localport); |
| 789 | } else |
| 790 | #endif |
| 791 | { |
| 792 | a.sin_family = AF_INET; |
| 793 | a.sin_addr.s_addr = p_htonl(INADDR_ANY); |
| 794 | a.sin_port = p_htons(localport); |
| 795 | } |
| 796 | #ifndef NO_IPV6 |
| 797 | sockcode = p_bind(s, (sock->addr->family == AF_INET6 ? |
| 798 | (struct sockaddr *) &a6 : |
| 799 | (struct sockaddr *) &a), |
| 800 | (sock->addr->family == |
| 801 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
| 802 | #else |
| 803 | sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 804 | #endif |
| 805 | if (sockcode != SOCKET_ERROR) { |
| 806 | err = 0; |
| 807 | break; /* done */ |
| 808 | } else { |
| 809 | err = p_WSAGetLastError(); |
| 810 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
| 811 | break; |
| 812 | } |
| 813 | |
| 814 | if (localport == 0) |
| 815 | break; /* we're only looping once */ |
| 816 | localport--; |
| 817 | if (localport == 0) |
| 818 | break; /* we might have got to the end */ |
| 819 | } |
| 820 | |
| 821 | if (err) { |
| 822 | sock->error = winsock_error_string(err); |
| 823 | goto ret; |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | * Connect to remote address. |
| 828 | */ |
| 829 | #ifndef NO_IPV6 |
| 830 | if (sock->addr->ai) { |
| 831 | if (family == AF_INET6) { |
| 832 | a6.sin6_family = AF_INET6; |
| 833 | a6.sin6_port = p_htons((short) sock->port); |
| 834 | a6.sin6_addr = |
| 835 | ((struct sockaddr_in6 *) sock->addr->ai->ai_addr)->sin6_addr; |
| 836 | } else { |
| 837 | a.sin_family = AF_INET; |
| 838 | a.sin_addr = |
| 839 | ((struct sockaddr_in *) sock->addr->ai->ai_addr)->sin_addr; |
| 840 | a.sin_port = p_htons((short) sock->port); |
| 841 | } |
| 842 | } else |
| 843 | #endif |
| 844 | { |
| 845 | assert(sock->addr->addresses && sock->addr->curraddr < sock->addr->naddresses); |
| 846 | a.sin_family = AF_INET; |
| 847 | a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->addr->curraddr]); |
| 848 | a.sin_port = p_htons((short) sock->port); |
| 849 | } |
| 850 | |
| 851 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 852 | * window, or an EventSelect on an event object. */ |
| 853 | errstr = do_select(s, 1); |
| 854 | if (errstr) { |
| 855 | sock->error = errstr; |
| 856 | err = 1; |
| 857 | goto ret; |
| 858 | } |
| 859 | |
| 860 | if (( |
| 861 | #ifndef NO_IPV6 |
| 862 | p_connect(s, |
| 863 | ((family == AF_INET6) ? (struct sockaddr *) &a6 : |
| 864 | (struct sockaddr *) &a), |
| 865 | (family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
| 866 | #else |
| 867 | p_connect(s, (struct sockaddr *) &a, sizeof(a)) |
| 868 | #endif |
| 869 | ) == SOCKET_ERROR) { |
| 870 | err = p_WSAGetLastError(); |
| 871 | /* |
| 872 | * We expect a potential EWOULDBLOCK here, because the |
| 873 | * chances are the front end has done a select for |
| 874 | * FD_CONNECT, so that connect() will complete |
| 875 | * asynchronously. |
| 876 | */ |
| 877 | if ( err != WSAEWOULDBLOCK ) { |
| 878 | sock->error = winsock_error_string(err); |
| 879 | goto ret; |
| 880 | } |
| 881 | } else { |
| 882 | /* |
| 883 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
| 884 | * and we should set the socket as writable. |
| 885 | */ |
| 886 | sock->writable = 1; |
| 887 | } |
| 888 | |
| 889 | add234(sktree, sock); |
| 890 | |
| 891 | err = 0; |
| 892 | |
| 893 | ret: |
| 894 | if (err) |
| 895 | plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err); |
| 896 | return err; |
| 897 | } |
| 898 | |
| 899 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
| 900 | int nodelay, int keepalive, Plug plug) |
| 901 | { |
| 902 | static const struct socket_function_table fn_table = { |
| 903 | sk_tcp_plug, |
| 904 | sk_tcp_close, |
| 905 | sk_tcp_write, |
| 906 | sk_tcp_write_oob, |
| 907 | sk_tcp_flush, |
| 908 | sk_tcp_set_private_ptr, |
| 909 | sk_tcp_get_private_ptr, |
| 910 | sk_tcp_set_frozen, |
| 911 | sk_tcp_socket_error |
| 912 | }; |
| 913 | |
| 914 | Actual_Socket ret; |
| 915 | DWORD err; |
| 916 | |
| 917 | /* |
| 918 | * Create Socket structure. |
| 919 | */ |
| 920 | ret = snew(struct Socket_tag); |
| 921 | ret->fn = &fn_table; |
| 922 | ret->error = NULL; |
| 923 | ret->plug = plug; |
| 924 | bufchain_init(&ret->output_data); |
| 925 | ret->connected = 0; /* to start with */ |
| 926 | ret->writable = 0; /* to start with */ |
| 927 | ret->sending_oob = 0; |
| 928 | ret->frozen = 0; |
| 929 | ret->frozen_readable = 0; |
| 930 | ret->localhost_only = 0; /* unused, but best init anyway */ |
| 931 | ret->pending_error = 0; |
| 932 | ret->parent = ret->child = NULL; |
| 933 | ret->oobinline = oobinline; |
| 934 | ret->nodelay = nodelay; |
| 935 | ret->keepalive = keepalive; |
| 936 | ret->privport = privport; |
| 937 | ret->port = port; |
| 938 | ret->addr = addr; |
| 939 | ret->s = INVALID_SOCKET; |
| 940 | |
| 941 | err = 0; |
| 942 | do { |
| 943 | err = try_connect(ret); |
| 944 | } while (err && sk_nextaddr(ret->addr)); |
| 945 | |
| 946 | return (Socket) ret; |
| 947 | } |
| 948 | |
| 949 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, |
| 950 | int orig_address_family) |
| 951 | { |
| 952 | static const struct socket_function_table fn_table = { |
| 953 | sk_tcp_plug, |
| 954 | sk_tcp_close, |
| 955 | sk_tcp_write, |
| 956 | sk_tcp_write_oob, |
| 957 | sk_tcp_flush, |
| 958 | sk_tcp_set_private_ptr, |
| 959 | sk_tcp_get_private_ptr, |
| 960 | sk_tcp_set_frozen, |
| 961 | sk_tcp_socket_error |
| 962 | }; |
| 963 | |
| 964 | SOCKET s; |
| 965 | #ifndef NO_IPV6 |
| 966 | SOCKADDR_IN6 a6; |
| 967 | #endif |
| 968 | SOCKADDR_IN a; |
| 969 | |
| 970 | DWORD err; |
| 971 | char *errstr; |
| 972 | Actual_Socket ret; |
| 973 | int retcode; |
| 974 | int on = 1; |
| 975 | |
| 976 | int address_family; |
| 977 | |
| 978 | /* |
| 979 | * Create Socket structure. |
| 980 | */ |
| 981 | ret = snew(struct Socket_tag); |
| 982 | ret->fn = &fn_table; |
| 983 | ret->error = NULL; |
| 984 | ret->plug = plug; |
| 985 | bufchain_init(&ret->output_data); |
| 986 | ret->writable = 0; /* to start with */ |
| 987 | ret->sending_oob = 0; |
| 988 | ret->frozen = 0; |
| 989 | ret->frozen_readable = 0; |
| 990 | ret->localhost_only = local_host_only; |
| 991 | ret->pending_error = 0; |
| 992 | ret->parent = ret->child = NULL; |
| 993 | ret->addr = NULL; |
| 994 | |
| 995 | /* |
| 996 | * Translate address_family from platform-independent constants |
| 997 | * into local reality. |
| 998 | */ |
| 999 | address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET : |
| 1000 | #ifndef NO_IPV6 |
| 1001 | orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
| 1002 | #endif |
| 1003 | AF_UNSPEC); |
| 1004 | |
| 1005 | /* |
| 1006 | * Our default, if passed the `don't care' value |
| 1007 | * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported, |
| 1008 | * we will also set up a second socket listening on IPv6, but |
| 1009 | * the v4 one is primary since that ought to work even on |
| 1010 | * non-v6-supporting systems. |
| 1011 | */ |
| 1012 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
| 1013 | |
| 1014 | /* |
| 1015 | * Open socket. |
| 1016 | */ |
| 1017 | s = p_socket(address_family, SOCK_STREAM, 0); |
| 1018 | ret->s = s; |
| 1019 | |
| 1020 | if (s == INVALID_SOCKET) { |
| 1021 | err = p_WSAGetLastError(); |
| 1022 | ret->error = winsock_error_string(err); |
| 1023 | return (Socket) ret; |
| 1024 | } |
| 1025 | |
| 1026 | ret->oobinline = 0; |
| 1027 | |
| 1028 | p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
| 1029 | |
| 1030 | #ifndef NO_IPV6 |
| 1031 | if (address_family == AF_INET6) { |
| 1032 | memset(&a6, 0, sizeof(a6)); |
| 1033 | a6.sin6_family = AF_INET6; |
| 1034 | /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't |
| 1035 | * know how to do it. :-) |
| 1036 | * (jeroen:) saddr is specified as an address.. eg 2001:db8::1 |
| 1037 | * Thus we need either a parser that understands [2001:db8::1]:80 |
| 1038 | * style addresses and/or enhance this to understand hostnames too. */ |
| 1039 | if (local_host_only) |
| 1040 | a6.sin6_addr = in6addr_loopback; |
| 1041 | else |
| 1042 | a6.sin6_addr = in6addr_any; |
| 1043 | a6.sin6_port = p_htons(port); |
| 1044 | } else |
| 1045 | #endif |
| 1046 | { |
| 1047 | int got_addr = 0; |
| 1048 | a.sin_family = AF_INET; |
| 1049 | |
| 1050 | /* |
| 1051 | * Bind to source address. First try an explicitly |
| 1052 | * specified one... |
| 1053 | */ |
| 1054 | if (srcaddr) { |
| 1055 | a.sin_addr.s_addr = p_inet_addr(srcaddr); |
| 1056 | if (a.sin_addr.s_addr != INADDR_NONE) { |
| 1057 | /* Override localhost_only with specified listen addr. */ |
| 1058 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
| 1059 | got_addr = 1; |
| 1060 | } |
| 1061 | } |
| 1062 | |
| 1063 | /* |
| 1064 | * ... and failing that, go with one of the standard ones. |
| 1065 | */ |
| 1066 | if (!got_addr) { |
| 1067 | if (local_host_only) |
| 1068 | a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK); |
| 1069 | else |
| 1070 | a.sin_addr.s_addr = p_htonl(INADDR_ANY); |
| 1071 | } |
| 1072 | |
| 1073 | a.sin_port = p_htons((short)port); |
| 1074 | } |
| 1075 | #ifndef NO_IPV6 |
| 1076 | retcode = p_bind(s, (address_family == AF_INET6 ? |
| 1077 | (struct sockaddr *) &a6 : |
| 1078 | (struct sockaddr *) &a), |
| 1079 | (address_family == |
| 1080 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
| 1081 | #else |
| 1082 | retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); |
| 1083 | #endif |
| 1084 | if (retcode != SOCKET_ERROR) { |
| 1085 | err = 0; |
| 1086 | } else { |
| 1087 | err = p_WSAGetLastError(); |
| 1088 | } |
| 1089 | |
| 1090 | if (err) { |
| 1091 | p_closesocket(s); |
| 1092 | ret->error = winsock_error_string(err); |
| 1093 | return (Socket) ret; |
| 1094 | } |
| 1095 | |
| 1096 | |
| 1097 | if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) { |
| 1098 | p_closesocket(s); |
| 1099 | ret->error = winsock_error_string(err); |
| 1100 | return (Socket) ret; |
| 1101 | } |
| 1102 | |
| 1103 | /* Set up a select mechanism. This could be an AsyncSelect on a |
| 1104 | * window, or an EventSelect on an event object. */ |
| 1105 | errstr = do_select(s, 1); |
| 1106 | if (errstr) { |
| 1107 | p_closesocket(s); |
| 1108 | ret->error = errstr; |
| 1109 | return (Socket) ret; |
| 1110 | } |
| 1111 | |
| 1112 | add234(sktree, ret); |
| 1113 | |
| 1114 | #ifndef NO_IPV6 |
| 1115 | /* |
| 1116 | * If we were given ADDRTYPE_UNSPEC, we must also create an |
| 1117 | * IPv6 listening socket and link it to this one. |
| 1118 | */ |
| 1119 | if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) { |
| 1120 | Actual_Socket other; |
| 1121 | |
| 1122 | other = (Actual_Socket) sk_newlistener(srcaddr, port, plug, |
| 1123 | local_host_only, ADDRTYPE_IPV6); |
| 1124 | |
| 1125 | if (other) { |
| 1126 | if (!other->error) { |
| 1127 | other->parent = ret; |
| 1128 | ret->child = other; |
| 1129 | } else { |
| 1130 | sfree(other); |
| 1131 | } |
| 1132 | } |
| 1133 | } |
| 1134 | #endif |
| 1135 | |
| 1136 | return (Socket) ret; |
| 1137 | } |
| 1138 | |
| 1139 | static void sk_tcp_close(Socket sock) |
| 1140 | { |
| 1141 | extern char *do_select(SOCKET skt, int startup); |
| 1142 | Actual_Socket s = (Actual_Socket) sock; |
| 1143 | |
| 1144 | if (s->child) |
| 1145 | sk_tcp_close((Socket)s->child); |
| 1146 | |
| 1147 | del234(sktree, s); |
| 1148 | do_select(s->s, 0); |
| 1149 | p_closesocket(s->s); |
| 1150 | if (s->addr) |
| 1151 | sk_addr_free(s->addr); |
| 1152 | sfree(s); |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * The function which tries to send on a socket once it's deemed |
| 1157 | * writable. |
| 1158 | */ |
| 1159 | void try_send(Actual_Socket s) |
| 1160 | { |
| 1161 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
| 1162 | int nsent; |
| 1163 | DWORD err; |
| 1164 | void *data; |
| 1165 | int len, urgentflag; |
| 1166 | |
| 1167 | if (s->sending_oob) { |
| 1168 | urgentflag = MSG_OOB; |
| 1169 | len = s->sending_oob; |
| 1170 | data = &s->oobdata; |
| 1171 | } else { |
| 1172 | urgentflag = 0; |
| 1173 | bufchain_prefix(&s->output_data, &data, &len); |
| 1174 | } |
| 1175 | nsent = p_send(s->s, data, len, urgentflag); |
| 1176 | noise_ultralight(nsent); |
| 1177 | if (nsent <= 0) { |
| 1178 | err = (nsent < 0 ? p_WSAGetLastError() : 0); |
| 1179 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
| 1180 | /* |
| 1181 | * Perfectly normal: we've sent all we can for the moment. |
| 1182 | * |
| 1183 | * (Some WinSock send() implementations can return |
| 1184 | * <0 but leave no sensible error indication - |
| 1185 | * WSAGetLastError() is called but returns zero or |
| 1186 | * a small number - so we check that case and treat |
| 1187 | * it just like WSAEWOULDBLOCK.) |
| 1188 | */ |
| 1189 | s->writable = FALSE; |
| 1190 | return; |
| 1191 | } else if (nsent == 0 || |
| 1192 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
| 1193 | /* |
| 1194 | * If send() returns CONNABORTED or CONNRESET, we |
| 1195 | * unfortunately can't just call plug_closing(), |
| 1196 | * because it's quite likely that we're currently |
| 1197 | * _in_ a call from the code we'd be calling back |
| 1198 | * to, so we'd have to make half the SSH code |
| 1199 | * reentrant. Instead we flag a pending error on |
| 1200 | * the socket, to be dealt with (by calling |
| 1201 | * plug_closing()) at some suitable future moment. |
| 1202 | */ |
| 1203 | s->pending_error = err; |
| 1204 | return; |
| 1205 | } else { |
| 1206 | /* We're inside the Windows frontend here, so we know |
| 1207 | * that the frontend handle is unnecessary. */ |
| 1208 | logevent(NULL, winsock_error_string(err)); |
| 1209 | fatalbox("%s", winsock_error_string(err)); |
| 1210 | } |
| 1211 | } else { |
| 1212 | if (s->sending_oob) { |
| 1213 | if (nsent < len) { |
| 1214 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
| 1215 | s->sending_oob = len - nsent; |
| 1216 | } else { |
| 1217 | s->sending_oob = 0; |
| 1218 | } |
| 1219 | } else { |
| 1220 | bufchain_consume(&s->output_data, nsent); |
| 1221 | } |
| 1222 | } |
| 1223 | } |
| 1224 | } |
| 1225 | |
| 1226 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
| 1227 | { |
| 1228 | Actual_Socket s = (Actual_Socket) sock; |
| 1229 | |
| 1230 | /* |
| 1231 | * Add the data to the buffer list on the socket. |
| 1232 | */ |
| 1233 | bufchain_add(&s->output_data, buf, len); |
| 1234 | |
| 1235 | /* |
| 1236 | * Now try sending from the start of the buffer list. |
| 1237 | */ |
| 1238 | if (s->writable) |
| 1239 | try_send(s); |
| 1240 | |
| 1241 | return bufchain_size(&s->output_data); |
| 1242 | } |
| 1243 | |
| 1244 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
| 1245 | { |
| 1246 | Actual_Socket s = (Actual_Socket) sock; |
| 1247 | |
| 1248 | /* |
| 1249 | * Replace the buffer list on the socket with the data. |
| 1250 | */ |
| 1251 | bufchain_clear(&s->output_data); |
| 1252 | assert(len <= sizeof(s->oobdata)); |
| 1253 | memcpy(s->oobdata, buf, len); |
| 1254 | s->sending_oob = len; |
| 1255 | |
| 1256 | /* |
| 1257 | * Now try sending from the start of the buffer list. |
| 1258 | */ |
| 1259 | if (s->writable) |
| 1260 | try_send(s); |
| 1261 | |
| 1262 | return s->sending_oob; |
| 1263 | } |
| 1264 | |
| 1265 | int select_result(WPARAM wParam, LPARAM lParam) |
| 1266 | { |
| 1267 | int ret, open; |
| 1268 | DWORD err; |
| 1269 | char buf[20480]; /* nice big buffer for plenty of speed */ |
| 1270 | Actual_Socket s; |
| 1271 | u_long atmark; |
| 1272 | |
| 1273 | /* wParam is the socket itself */ |
| 1274 | |
| 1275 | if (wParam == 0) |
| 1276 | return 1; /* boggle */ |
| 1277 | |
| 1278 | s = find234(sktree, (void *) wParam, cmpforsearch); |
| 1279 | if (!s) |
| 1280 | return 1; /* boggle */ |
| 1281 | |
| 1282 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
| 1283 | /* |
| 1284 | * An error has occurred on this socket. Pass it to the |
| 1285 | * plug. |
| 1286 | */ |
| 1287 | if (s->addr) { |
| 1288 | plug_log(s->plug, 1, s->addr, s->port, |
| 1289 | winsock_error_string(err), err); |
| 1290 | while (s->addr && sk_nextaddr(s->addr)) { |
| 1291 | err = try_connect(s); |
| 1292 | } |
| 1293 | } |
| 1294 | if (err != 0) |
| 1295 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
| 1296 | else |
| 1297 | return 1; |
| 1298 | } |
| 1299 | |
| 1300 | noise_ultralight(lParam); |
| 1301 | |
| 1302 | switch (WSAGETSELECTEVENT(lParam)) { |
| 1303 | case FD_CONNECT: |
| 1304 | s->connected = s->writable = 1; |
| 1305 | /* |
| 1306 | * Once a socket is connected, we can stop falling |
| 1307 | * back through the candidate addresses to connect |
| 1308 | * to. |
| 1309 | */ |
| 1310 | if (s->addr) { |
| 1311 | sk_addr_free(s->addr); |
| 1312 | s->addr = NULL; |
| 1313 | } |
| 1314 | break; |
| 1315 | case FD_READ: |
| 1316 | /* In the case the socket is still frozen, we don't even bother */ |
| 1317 | if (s->frozen) { |
| 1318 | s->frozen_readable = 1; |
| 1319 | break; |
| 1320 | } |
| 1321 | |
| 1322 | /* |
| 1323 | * We have received data on the socket. For an oobinline |
| 1324 | * socket, this might be data _before_ an urgent pointer, |
| 1325 | * in which case we send it to the back end with type==1 |
| 1326 | * (data prior to urgent). |
| 1327 | */ |
| 1328 | if (s->oobinline) { |
| 1329 | atmark = 1; |
| 1330 | p_ioctlsocket(s->s, SIOCATMARK, &atmark); |
| 1331 | /* |
| 1332 | * Avoid checking the return value from ioctlsocket(), |
| 1333 | * on the grounds that some WinSock wrappers don't |
| 1334 | * support it. If it does nothing, we get atmark==1, |
| 1335 | * which is equivalent to `no OOB pending', so the |
| 1336 | * effect will be to non-OOB-ify any OOB data. |
| 1337 | */ |
| 1338 | } else |
| 1339 | atmark = 1; |
| 1340 | |
| 1341 | ret = p_recv(s->s, buf, sizeof(buf), 0); |
| 1342 | noise_ultralight(ret); |
| 1343 | if (ret < 0) { |
| 1344 | err = p_WSAGetLastError(); |
| 1345 | if (err == WSAEWOULDBLOCK) { |
| 1346 | break; |
| 1347 | } |
| 1348 | } |
| 1349 | if (ret < 0) { |
| 1350 | return plug_closing(s->plug, winsock_error_string(err), err, |
| 1351 | 0); |
| 1352 | } else if (0 == ret) { |
| 1353 | return plug_closing(s->plug, NULL, 0, 0); |
| 1354 | } else { |
| 1355 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
| 1356 | } |
| 1357 | break; |
| 1358 | case FD_OOB: |
| 1359 | /* |
| 1360 | * This will only happen on a non-oobinline socket. It |
| 1361 | * indicates that we can immediately perform an OOB read |
| 1362 | * and get back OOB data, which we will send to the back |
| 1363 | * end with type==2 (urgent data). |
| 1364 | */ |
| 1365 | ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB); |
| 1366 | noise_ultralight(ret); |
| 1367 | if (ret <= 0) { |
| 1368 | char *str = (ret == 0 ? "Internal networking trouble" : |
| 1369 | winsock_error_string(p_WSAGetLastError())); |
| 1370 | /* We're inside the Windows frontend here, so we know |
| 1371 | * that the frontend handle is unnecessary. */ |
| 1372 | logevent(NULL, str); |
| 1373 | fatalbox("%s", str); |
| 1374 | } else { |
| 1375 | return plug_receive(s->plug, 2, buf, ret); |
| 1376 | } |
| 1377 | break; |
| 1378 | case FD_WRITE: |
| 1379 | { |
| 1380 | int bufsize_before, bufsize_after; |
| 1381 | s->writable = 1; |
| 1382 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
| 1383 | try_send(s); |
| 1384 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
| 1385 | if (bufsize_after < bufsize_before) |
| 1386 | plug_sent(s->plug, bufsize_after); |
| 1387 | } |
| 1388 | break; |
| 1389 | case FD_CLOSE: |
| 1390 | /* Signal a close on the socket. First read any outstanding data. */ |
| 1391 | open = 1; |
| 1392 | do { |
| 1393 | ret = p_recv(s->s, buf, sizeof(buf), 0); |
| 1394 | if (ret < 0) { |
| 1395 | err = p_WSAGetLastError(); |
| 1396 | if (err == WSAEWOULDBLOCK) |
| 1397 | break; |
| 1398 | return plug_closing(s->plug, winsock_error_string(err), |
| 1399 | err, 0); |
| 1400 | } else { |
| 1401 | if (ret) |
| 1402 | open &= plug_receive(s->plug, 0, buf, ret); |
| 1403 | else |
| 1404 | open &= plug_closing(s->plug, NULL, 0, 0); |
| 1405 | } |
| 1406 | } while (ret > 0); |
| 1407 | return open; |
| 1408 | case FD_ACCEPT: |
| 1409 | { |
| 1410 | #ifdef NO_IPV6 |
| 1411 | struct sockaddr_in isa; |
| 1412 | #else |
| 1413 | struct sockaddr_storage isa; |
| 1414 | #endif |
| 1415 | int addrlen = sizeof(isa); |
| 1416 | SOCKET t; /* socket of connection */ |
| 1417 | |
| 1418 | memset(&isa, 0, sizeof(isa)); |
| 1419 | err = 0; |
| 1420 | t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen); |
| 1421 | if (t == INVALID_SOCKET) |
| 1422 | { |
| 1423 | err = p_WSAGetLastError(); |
| 1424 | if (err == WSATRY_AGAIN) |
| 1425 | break; |
| 1426 | } |
| 1427 | #ifndef NO_IPV6 |
| 1428 | if (isa.ss_family == AF_INET && |
| 1429 | s->localhost_only && |
| 1430 | !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr)) { |
| 1431 | #else |
| 1432 | if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr)) { |
| 1433 | #endif |
| 1434 | p_closesocket(t); /* dodgy WinSock let nonlocal through */ |
| 1435 | } else if (plug_accepting(s->plug, (void*)t)) { |
| 1436 | p_closesocket(t); /* denied or error */ |
| 1437 | } |
| 1438 | } |
| 1439 | } |
| 1440 | |
| 1441 | return 1; |
| 1442 | } |
| 1443 | |
| 1444 | /* |
| 1445 | * Deal with socket errors detected in try_send(). |
| 1446 | */ |
| 1447 | void net_pending_errors(void) |
| 1448 | { |
| 1449 | int i; |
| 1450 | Actual_Socket s; |
| 1451 | |
| 1452 | /* |
| 1453 | * This might be a fiddly business, because it's just possible |
| 1454 | * that handling a pending error on one socket might cause |
| 1455 | * others to be closed. (I can't think of any reason this might |
| 1456 | * happen in current SSH implementation, but to maintain |
| 1457 | * generality of this network layer I'll assume the worst.) |
| 1458 | * |
| 1459 | * So what we'll do is search the socket list for _one_ socket |
| 1460 | * with a pending error, and then handle it, and then search |
| 1461 | * the list again _from the beginning_. Repeat until we make a |
| 1462 | * pass with no socket errors present. That way we are |
| 1463 | * protected against the socket list changing under our feet. |
| 1464 | */ |
| 1465 | |
| 1466 | do { |
| 1467 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
| 1468 | if (s->pending_error) { |
| 1469 | /* |
| 1470 | * An error has occurred on this socket. Pass it to the |
| 1471 | * plug. |
| 1472 | */ |
| 1473 | plug_closing(s->plug, |
| 1474 | winsock_error_string(s->pending_error), |
| 1475 | s->pending_error, 0); |
| 1476 | break; |
| 1477 | } |
| 1478 | } |
| 1479 | } while (s); |
| 1480 | } |
| 1481 | |
| 1482 | /* |
| 1483 | * Each socket abstraction contains a `void *' private field in |
| 1484 | * which the client can keep state. |
| 1485 | */ |
| 1486 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
| 1487 | { |
| 1488 | Actual_Socket s = (Actual_Socket) sock; |
| 1489 | s->private_ptr = ptr; |
| 1490 | } |
| 1491 | |
| 1492 | static void *sk_tcp_get_private_ptr(Socket sock) |
| 1493 | { |
| 1494 | Actual_Socket s = (Actual_Socket) sock; |
| 1495 | return s->private_ptr; |
| 1496 | } |
| 1497 | |
| 1498 | /* |
| 1499 | * Special error values are returned from sk_namelookup and sk_new |
| 1500 | * if there's a problem. These functions extract an error message, |
| 1501 | * or return NULL if there's no problem. |
| 1502 | */ |
| 1503 | const char *sk_addr_error(SockAddr addr) |
| 1504 | { |
| 1505 | return addr->error; |
| 1506 | } |
| 1507 | static const char *sk_tcp_socket_error(Socket sock) |
| 1508 | { |
| 1509 | Actual_Socket s = (Actual_Socket) sock; |
| 1510 | return s->error; |
| 1511 | } |
| 1512 | |
| 1513 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
| 1514 | { |
| 1515 | Actual_Socket s = (Actual_Socket) sock; |
| 1516 | if (s->frozen == is_frozen) |
| 1517 | return; |
| 1518 | s->frozen = is_frozen; |
| 1519 | if (!is_frozen && s->frozen_readable) { |
| 1520 | char c; |
| 1521 | p_recv(s->s, &c, 1, MSG_PEEK); |
| 1522 | } |
| 1523 | s->frozen_readable = 0; |
| 1524 | } |
| 1525 | |
| 1526 | /* |
| 1527 | * For Plink: enumerate all sockets currently active. |
| 1528 | */ |
| 1529 | SOCKET first_socket(int *state) |
| 1530 | { |
| 1531 | Actual_Socket s; |
| 1532 | *state = 0; |
| 1533 | s = index234(sktree, (*state)++); |
| 1534 | return s ? s->s : INVALID_SOCKET; |
| 1535 | } |
| 1536 | |
| 1537 | SOCKET next_socket(int *state) |
| 1538 | { |
| 1539 | Actual_Socket s = index234(sktree, (*state)++); |
| 1540 | return s ? s->s : INVALID_SOCKET; |
| 1541 | } |
| 1542 | |
| 1543 | extern int socket_writable(SOCKET skt) |
| 1544 | { |
| 1545 | Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch); |
| 1546 | |
| 1547 | if (s) |
| 1548 | return bufchain_size(&s->output_data) > 0; |
| 1549 | else |
| 1550 | return 0; |
| 1551 | } |
| 1552 | |
| 1553 | int net_service_lookup(char *service) |
| 1554 | { |
| 1555 | struct servent *se; |
| 1556 | se = p_getservbyname(service, NULL); |
| 1557 | if (se != NULL) |
| 1558 | return p_ntohs(se->s_port); |
| 1559 | else |
| 1560 | return 0; |
| 1561 | } |
| 1562 | |
| 1563 | SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname) |
| 1564 | { |
| 1565 | SockAddr ret = snew(struct SockAddr_tag); |
| 1566 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
| 1567 | ret->error = "unix sockets not supported on this platform"; |
| 1568 | return ret; |
| 1569 | } |