2f75bae1 |
1 | /* |
2 | * Windows networking abstraction. |
c4d8e107 |
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 | * |
2f75bae1 |
32 | */ |
33 | |
c4d8e107 |
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 | |
2f75bae1 |
41 | #include <stdio.h> |
49bad831 |
42 | #include <stdlib.h> |
5471d09a |
43 | #include <assert.h> |
2f75bae1 |
44 | |
7e78000d |
45 | #define DEFINE_PLUG_METHOD_MACROS |
2f75bae1 |
46 | #include "putty.h" |
47 | #include "network.h" |
48 | #include "tree234.h" |
49 | |
7440fd44 |
50 | #ifdef IPV6 |
51 | #include <ws2tcpip.h> |
52 | #include <tpipv6.h> |
53 | #endif |
54 | |
6ee9b735 |
55 | #define ipv4_is_loopback(addr) \ |
7440fd44 |
56 | ((p_ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L) |
6ee9b735 |
57 | |
2f75bae1 |
58 | struct Socket_tag { |
c85623f9 |
59 | const struct socket_function_table *fn; |
7e78000d |
60 | /* the above variable absolutely *must* be the first in this structure */ |
2f75bae1 |
61 | char *error; |
62 | SOCKET s; |
7e78000d |
63 | Plug plug; |
2f75bae1 |
64 | void *private_ptr; |
5471d09a |
65 | bufchain output_data; |
3ad9d396 |
66 | int connected; |
2f75bae1 |
67 | int writable; |
5471d09a |
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 */ |
bc4802a1 |
71 | int localhost_only; /* for listening sockets */ |
5471d09a |
72 | char oobdata[1]; |
1ad4eb6f |
73 | int sending_oob; |
4b1e8acc |
74 | int oobinline; |
7732d38a |
75 | int pending_error; /* in case send() returns error */ |
2f75bae1 |
76 | }; |
77 | |
7e78000d |
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 | |
2f75bae1 |
88 | struct SockAddr_tag { |
89 | char *error; |
b7a189f3 |
90 | /* |
91 | * Which address family this address belongs to. AF_INET for |
92 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
93 | * resolution has not been done and a simple host name is held |
94 | * in this SockAddr structure. |
95 | */ |
32874aea |
96 | int family; |
c4d8e107 |
97 | unsigned long address; /* Address IPv4 style. */ |
98 | #ifdef IPV6 |
99 | struct addrinfo *ai; /* Address IPv6 style. */ |
100 | #endif |
b7a189f3 |
101 | char hostname[512]; /* Store an unresolved host name. */ |
2f75bae1 |
102 | }; |
103 | |
2f75bae1 |
104 | static tree234 *sktree; |
105 | |
32874aea |
106 | static int cmpfortree(void *av, void *bv) |
107 | { |
108 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
109 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
110 | if (as < bs) |
111 | return -1; |
112 | if (as > bs) |
113 | return +1; |
2f75bae1 |
114 | return 0; |
115 | } |
116 | |
32874aea |
117 | static int cmpforsearch(void *av, void *bv) |
118 | { |
119 | Actual_Socket b = (Actual_Socket) bv; |
120 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
121 | if (as < bs) |
122 | return -1; |
123 | if (as > bs) |
124 | return +1; |
2f75bae1 |
125 | return 0; |
126 | } |
127 | |
7440fd44 |
128 | #define NOTHING |
129 | #define DECL_WINSOCK_FUNCTION(linkage, rettype, name, params) \ |
130 | typedef rettype (WINAPI *t_##name) params; \ |
131 | linkage t_##name p_##name |
132 | #define GET_WINSOCK_FUNCTION(name) \ |
133 | p_##name = (t_##name) GetProcAddress(winsock_module, #name) |
134 | |
135 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAAsyncSelect, |
136 | (SOCKET, HWND, u_int, long)); |
137 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEventSelect, (SOCKET, WSAEVENT, long)); |
138 | DECL_WINSOCK_FUNCTION(NOTHING, int, select, |
139 | (int, fd_set FAR *, fd_set FAR *, |
140 | fd_set FAR *, const struct timeval FAR *)); |
141 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAGetLastError, (void)); |
142 | DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEnumNetworkEvents, |
143 | (SOCKET, WSAEVENT, LPWSANETWORKEVENTS)); |
144 | DECL_WINSOCK_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA)); |
145 | DECL_WINSOCK_FUNCTION(static, int, WSACleanup, (void)); |
146 | DECL_WINSOCK_FUNCTION(static, int, closesocket, (SOCKET)); |
147 | DECL_WINSOCK_FUNCTION(static, u_long, ntohl, (u_long)); |
148 | DECL_WINSOCK_FUNCTION(static, u_long, htonl, (u_long)); |
149 | DECL_WINSOCK_FUNCTION(static, u_short, htons, (u_short)); |
150 | DECL_WINSOCK_FUNCTION(static, u_short, ntohs, (u_short)); |
151 | DECL_WINSOCK_FUNCTION(static, struct hostent FAR *, gethostbyname, |
152 | (const char FAR *)); |
153 | DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname, |
154 | (const char FAR *, const char FAR *)); |
155 | DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *)); |
156 | DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr)); |
157 | DECL_WINSOCK_FUNCTION(static, int, connect, |
158 | (SOCKET, const struct sockaddr FAR *, int)); |
159 | DECL_WINSOCK_FUNCTION(static, int, bind, |
160 | (SOCKET, const struct sockaddr FAR *, int)); |
161 | DECL_WINSOCK_FUNCTION(static, int, setsockopt, |
162 | (SOCKET, int, int, const char FAR *, int)); |
163 | DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int)); |
164 | DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int)); |
165 | DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int)); |
166 | DECL_WINSOCK_FUNCTION(static, int, ioctlsocket, |
167 | (SOCKET, long, u_long FAR *)); |
168 | DECL_WINSOCK_FUNCTION(static, SOCKET, accept, |
169 | (SOCKET, struct sockaddr FAR *, int FAR *)); |
170 | DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int)); |
171 | |
172 | static HMODULE winsock_module; |
173 | |
32874aea |
174 | void sk_init(void) |
175 | { |
7440fd44 |
176 | WORD winsock_ver; |
177 | WSADATA wsadata; |
178 | |
179 | winsock_ver = MAKEWORD(2, 0); |
180 | winsock_module = LoadLibrary("WS2_32.DLL"); |
181 | if (!winsock_module) { |
182 | winsock_module = LoadLibrary("WSOCK32.DLL"); |
183 | winsock_ver = MAKEWORD(1, 1); |
184 | } |
185 | if (!winsock_module) |
186 | fatalbox("Unable to load any WinSock library"); |
187 | |
188 | GET_WINSOCK_FUNCTION(WSAAsyncSelect); |
189 | GET_WINSOCK_FUNCTION(WSAEventSelect); |
190 | GET_WINSOCK_FUNCTION(select); |
191 | GET_WINSOCK_FUNCTION(WSAGetLastError); |
192 | GET_WINSOCK_FUNCTION(WSAEnumNetworkEvents); |
193 | GET_WINSOCK_FUNCTION(WSAStartup); |
194 | GET_WINSOCK_FUNCTION(WSACleanup); |
195 | GET_WINSOCK_FUNCTION(closesocket); |
196 | GET_WINSOCK_FUNCTION(ntohl); |
197 | GET_WINSOCK_FUNCTION(htonl); |
198 | GET_WINSOCK_FUNCTION(htons); |
199 | GET_WINSOCK_FUNCTION(ntohs); |
200 | GET_WINSOCK_FUNCTION(gethostbyname); |
201 | GET_WINSOCK_FUNCTION(getservbyname); |
202 | GET_WINSOCK_FUNCTION(inet_addr); |
203 | GET_WINSOCK_FUNCTION(inet_ntoa); |
204 | GET_WINSOCK_FUNCTION(connect); |
205 | GET_WINSOCK_FUNCTION(bind); |
206 | GET_WINSOCK_FUNCTION(setsockopt); |
207 | GET_WINSOCK_FUNCTION(socket); |
208 | GET_WINSOCK_FUNCTION(listen); |
209 | GET_WINSOCK_FUNCTION(send); |
210 | GET_WINSOCK_FUNCTION(ioctlsocket); |
211 | GET_WINSOCK_FUNCTION(accept); |
212 | GET_WINSOCK_FUNCTION(recv); |
213 | |
214 | if (p_WSAStartup(winsock_ver, &wsadata)) { |
215 | fatalbox("Unable to initialise WinSock"); |
216 | } |
217 | if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) { |
218 | p_WSACleanup(); |
219 | fatalbox("WinSock version is incompatible with %d.%d", |
220 | LOBYTE(winsock_ver), HIBYTE(winsock_ver)); |
221 | } |
222 | |
2f75bae1 |
223 | sktree = newtree234(cmpfortree); |
224 | } |
225 | |
93b581bd |
226 | void sk_cleanup(void) |
227 | { |
228 | Actual_Socket s; |
229 | int i; |
230 | |
231 | if (sktree) { |
232 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
7440fd44 |
233 | p_closesocket(s->s); |
93b581bd |
234 | } |
235 | } |
7440fd44 |
236 | |
237 | p_WSACleanup(); |
238 | if (winsock_module) |
239 | FreeLibrary(winsock_module); |
93b581bd |
240 | } |
241 | |
32874aea |
242 | char *winsock_error_string(int error) |
243 | { |
e74fbad9 |
244 | switch (error) { |
32874aea |
245 | case WSAEACCES: |
246 | return "Network error: Permission denied"; |
247 | case WSAEADDRINUSE: |
248 | return "Network error: Address already in use"; |
249 | case WSAEADDRNOTAVAIL: |
250 | return "Network error: Cannot assign requested address"; |
251 | case WSAEAFNOSUPPORT: |
252 | return |
253 | "Network error: Address family not supported by protocol family"; |
254 | case WSAEALREADY: |
255 | return "Network error: Operation already in progress"; |
256 | case WSAECONNABORTED: |
257 | return "Network error: Software caused connection abort"; |
258 | case WSAECONNREFUSED: |
259 | return "Network error: Connection refused"; |
260 | case WSAECONNRESET: |
261 | return "Network error: Connection reset by peer"; |
262 | case WSAEDESTADDRREQ: |
263 | return "Network error: Destination address required"; |
264 | case WSAEFAULT: |
265 | return "Network error: Bad address"; |
266 | case WSAEHOSTDOWN: |
267 | return "Network error: Host is down"; |
268 | case WSAEHOSTUNREACH: |
269 | return "Network error: No route to host"; |
270 | case WSAEINPROGRESS: |
271 | return "Network error: Operation now in progress"; |
272 | case WSAEINTR: |
273 | return "Network error: Interrupted function call"; |
274 | case WSAEINVAL: |
275 | return "Network error: Invalid argument"; |
276 | case WSAEISCONN: |
277 | return "Network error: Socket is already connected"; |
278 | case WSAEMFILE: |
279 | return "Network error: Too many open files"; |
280 | case WSAEMSGSIZE: |
281 | return "Network error: Message too long"; |
282 | case WSAENETDOWN: |
283 | return "Network error: Network is down"; |
284 | case WSAENETRESET: |
285 | return "Network error: Network dropped connection on reset"; |
286 | case WSAENETUNREACH: |
287 | return "Network error: Network is unreachable"; |
288 | case WSAENOBUFS: |
289 | return "Network error: No buffer space available"; |
290 | case WSAENOPROTOOPT: |
291 | return "Network error: Bad protocol option"; |
292 | case WSAENOTCONN: |
293 | return "Network error: Socket is not connected"; |
294 | case WSAENOTSOCK: |
295 | return "Network error: Socket operation on non-socket"; |
296 | case WSAEOPNOTSUPP: |
297 | return "Network error: Operation not supported"; |
298 | case WSAEPFNOSUPPORT: |
299 | return "Network error: Protocol family not supported"; |
300 | case WSAEPROCLIM: |
301 | return "Network error: Too many processes"; |
302 | case WSAEPROTONOSUPPORT: |
303 | return "Network error: Protocol not supported"; |
304 | case WSAEPROTOTYPE: |
305 | return "Network error: Protocol wrong type for socket"; |
306 | case WSAESHUTDOWN: |
307 | return "Network error: Cannot send after socket shutdown"; |
308 | case WSAESOCKTNOSUPPORT: |
309 | return "Network error: Socket type not supported"; |
310 | case WSAETIMEDOUT: |
311 | return "Network error: Connection timed out"; |
312 | case WSAEWOULDBLOCK: |
313 | return "Network error: Resource temporarily unavailable"; |
314 | case WSAEDISCON: |
315 | return "Network error: Graceful shutdown in progress"; |
316 | default: |
317 | return "Unknown network error"; |
e74fbad9 |
318 | } |
319 | } |
320 | |
e8fa8f62 |
321 | SockAddr sk_namelookup(const char *host, char **canonicalname) |
c4d8e107 |
322 | { |
3d88e64d |
323 | SockAddr ret = snew(struct SockAddr_tag); |
2f75bae1 |
324 | unsigned long a; |
c4d8e107 |
325 | struct hostent *h = NULL; |
6e1ebb76 |
326 | char realhost[8192]; |
2f75bae1 |
327 | |
c4d8e107 |
328 | /* Clear the structure and default to IPv4. */ |
329 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
330 | ret->family = 0; /* We set this one when we have resolved the host. */ |
6e1ebb76 |
331 | *realhost = '\0'; |
c4d8e107 |
332 | |
7440fd44 |
333 | if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) { |
c4d8e107 |
334 | #ifdef IPV6 |
335 | |
336 | /* Try to get the getaddrinfo() function from wship6.dll */ |
337 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
338 | * it will fallback to IPv4. */ |
32874aea |
339 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
340 | const char *servname, |
341 | const struct addrinfo * |
342 | hints, |
343 | struct addrinfo ** res); |
c4d8e107 |
344 | FGETADDRINFO fGetAddrInfo = NULL; |
345 | |
346 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
347 | if (dllWSHIP6) |
32874aea |
348 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
349 | "getaddrinfo"); |
c4d8e107 |
350 | |
351 | /* |
352 | * Use fGetAddrInfo when it's available (which usually also |
353 | * means IPv6 is installed...) |
354 | */ |
32874aea |
355 | if (fGetAddrInfo) { |
c4d8e107 |
356 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
357 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
358 | ret->family = ret->ai->ai_family; |
32874aea |
359 | } else |
c4d8e107 |
360 | #endif |
32874aea |
361 | { |
c4d8e107 |
362 | /* |
363 | * Otherwise use the IPv4-only gethostbyname... |
364 | * (NOTE: we don't use gethostbyname as a |
365 | * fallback!) |
366 | */ |
32874aea |
367 | if (ret->family == 0) { |
368 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
7440fd44 |
369 | if ( (h = p_gethostbyname(host)) ) |
32874aea |
370 | ret->family = AF_INET; |
371 | } |
c4d8e107 |
372 | } |
373 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
374 | |
32874aea |
375 | if (ret->family == 0) { |
7440fd44 |
376 | DWORD err = p_WSAGetLastError(); |
c4d8e107 |
377 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
32874aea |
378 | err == |
379 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
380 | == WSATRY_AGAIN ? "Host not found" : |
c4d8e107 |
381 | #ifdef IPV6 |
382 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
383 | #endif |
384 | "gethostbyname: unknown error"); |
385 | #ifdef DEBUG |
386 | { |
387 | LPVOID lpMsgBuf; |
32874aea |
388 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | |
389 | FORMAT_MESSAGE_FROM_SYSTEM | |
390 | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
391 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
392 | (LPTSTR) & lpMsgBuf, 0, NULL); |
393 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */ |
c4d8e107 |
394 | /* Free the buffer. */ |
395 | LocalFree(lpMsgBuf); |
396 | } |
397 | #endif |
32874aea |
398 | } else { |
c4d8e107 |
399 | ret->error = NULL; |
400 | |
401 | #ifdef IPV6 |
402 | /* If we got an address info use that... */ |
32874aea |
403 | if (ret->ai) { |
404 | typedef int (CALLBACK * FGETNAMEINFO) |
405 | (const struct sockaddr FAR * sa, socklen_t salen, |
406 | char FAR * host, size_t hostlen, char FAR * serv, |
407 | size_t servlen, int flags); |
c4d8e107 |
408 | FGETNAMEINFO fGetNameInfo = NULL; |
409 | |
410 | /* Are we in IPv4 fallback mode? */ |
411 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
412 | if (ret->family == AF_INET) |
32874aea |
413 | memcpy(&a, |
414 | (char *) &((SOCKADDR_IN *) ret->ai-> |
415 | ai_addr)->sin_addr, sizeof(a)); |
c4d8e107 |
416 | |
417 | /* Now let's find that canonicalname... */ |
32874aea |
418 | if ((dllWSHIP6) |
419 | && (fGetNameInfo = |
420 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
421 | "getnameinfo"))) { |
422 | if (fGetNameInfo |
423 | ((struct sockaddr *) ret->ai->ai_addr, |
424 | ret->family == |
425 | AF_INET ? sizeof(SOCKADDR_IN) : |
6e1ebb76 |
426 | sizeof(SOCKADDR_IN6), realhost, |
427 | sizeof(realhost), NULL, 0, 0) != 0) { |
428 | strncpy(realhost, host, sizeof(realhost)); |
c4d8e107 |
429 | } |
430 | } |
431 | } |
432 | /* We used the IPv4-only gethostbyname()... */ |
433 | else |
c4d8e107 |
434 | #endif |
32874aea |
435 | { |
c4d8e107 |
436 | memcpy(&a, h->h_addr, sizeof(a)); |
437 | /* This way we are always sure the h->h_name is valid :) */ |
6e1ebb76 |
438 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c4d8e107 |
439 | } |
c4d8e107 |
440 | } |
441 | #ifdef IPV6 |
442 | FreeLibrary(dllWSHIP6); |
443 | #endif |
32874aea |
444 | } else { |
87ed061f |
445 | /* |
446 | * This must be a numeric IPv4 address because it caused a |
447 | * success return from inet_addr. |
448 | */ |
32874aea |
449 | ret->family = AF_INET; |
6e1ebb76 |
450 | strncpy(realhost, host, sizeof(realhost)); |
2f75bae1 |
451 | } |
7440fd44 |
452 | ret->address = p_ntohl(a); |
6e1ebb76 |
453 | realhost[lenof(realhost)-1] = '\0'; |
3d88e64d |
454 | *canonicalname = snewn(1+strlen(realhost), char); |
6e1ebb76 |
455 | strcpy(*canonicalname, realhost); |
2f75bae1 |
456 | return ret; |
457 | } |
458 | |
e8fa8f62 |
459 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
460 | { |
3d88e64d |
461 | SockAddr ret = snew(struct SockAddr_tag); |
ab0873ab |
462 | ret->error = NULL; |
b7a189f3 |
463 | ret->family = AF_UNSPEC; |
464 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
465 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
466 | return ret; |
467 | } |
468 | |
3ad9d396 |
469 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
470 | { |
471 | #ifdef IPV6 |
b7a189f3 |
472 | if (addr->family == AF_INET6) { |
473 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
474 | } else |
3ad9d396 |
475 | #endif |
b7a189f3 |
476 | if (addr->family == AF_INET) { |
3ad9d396 |
477 | struct in_addr a; |
7440fd44 |
478 | a.s_addr = p_htonl(addr->address); |
479 | strncpy(buf, p_inet_ntoa(a), buflen); |
b7a189f3 |
480 | buf[buflen-1] = '\0'; |
3ad9d396 |
481 | } else { |
b7a189f3 |
482 | assert(addr->family == AF_UNSPEC); |
483 | strncpy(buf, addr->hostname, buflen); |
484 | buf[buflen-1] = '\0'; |
3ad9d396 |
485 | } |
3ad9d396 |
486 | } |
487 | |
b804e1e5 |
488 | int sk_hostname_is_local(char *name) |
489 | { |
490 | return !strcmp(name, "localhost"); |
491 | } |
492 | |
493 | int sk_address_is_local(SockAddr addr) |
494 | { |
495 | #ifdef IPV6 |
b7a189f3 |
496 | if (addr->family == AF_INET6) { |
497 | FIXME; /* someone who can compile for IPV6 had better do this bit */ |
498 | } else |
b804e1e5 |
499 | #endif |
b7a189f3 |
500 | if (addr->family == AF_INET) { |
b804e1e5 |
501 | struct in_addr a; |
7440fd44 |
502 | a.s_addr = p_htonl(addr->address); |
b804e1e5 |
503 | return ipv4_is_loopback(a); |
b804e1e5 |
504 | } else { |
b7a189f3 |
505 | assert(addr->family == AF_UNSPEC); |
506 | return 0; /* we don't know; assume not */ |
b804e1e5 |
507 | } |
b804e1e5 |
508 | } |
509 | |
6971bbe7 |
510 | int sk_addrtype(SockAddr addr) |
511 | { |
b7a189f3 |
512 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
513 | #ifdef IPV6 |
514 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
515 | #endif |
516 | ADDRTYPE_NAME); |
6971bbe7 |
517 | } |
518 | |
519 | void sk_addrcopy(SockAddr addr, char *buf) |
520 | { |
b7a189f3 |
521 | assert(addr->family != AF_UNSPEC); |
6971bbe7 |
522 | #ifdef IPV6 |
b7a189f3 |
523 | if (addr->family == AF_INET6) { |
524 | memcpy(buf, (char*) addr->ai, 16); |
525 | } else |
6971bbe7 |
526 | #endif |
b7a189f3 |
527 | if (addr->family == AF_INET) { |
6971bbe7 |
528 | struct in_addr a; |
7440fd44 |
529 | a.s_addr = p_htonl(addr->address); |
96d9eb89 |
530 | memcpy(buf, (char*) &a.s_addr, 4); |
6971bbe7 |
531 | } |
6971bbe7 |
532 | } |
533 | |
32874aea |
534 | void sk_addr_free(SockAddr addr) |
535 | { |
2f75bae1 |
536 | sfree(addr); |
537 | } |
538 | |
32874aea |
539 | static Plug sk_tcp_plug(Socket sock, Plug p) |
540 | { |
7e78000d |
541 | Actual_Socket s = (Actual_Socket) sock; |
542 | Plug ret = s->plug; |
32874aea |
543 | if (p) |
544 | s->plug = p; |
7e78000d |
545 | return ret; |
546 | } |
547 | |
32874aea |
548 | static void sk_tcp_flush(Socket s) |
549 | { |
7e78000d |
550 | /* |
551 | * We send data to the socket as soon as we can anyway, |
552 | * so we don't need to do anything here. :-) |
553 | */ |
554 | } |
555 | |
2d466ffd |
556 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
557 | static int sk_tcp_write(Socket s, const char *data, int len); |
558 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
8eebd221 |
559 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
560 | static void *sk_tcp_get_private_ptr(Socket s); |
561 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
cbe2d68f |
562 | static const char *sk_tcp_socket_error(Socket s); |
7e78000d |
563 | |
d74d141c |
564 | extern char *do_select(SOCKET skt, int startup); |
565 | |
566 | Socket sk_register(void *sock, Plug plug) |
567 | { |
c85623f9 |
568 | static const struct socket_function_table fn_table = { |
d74d141c |
569 | sk_tcp_plug, |
570 | sk_tcp_close, |
571 | sk_tcp_write, |
572 | sk_tcp_write_oob, |
573 | sk_tcp_flush, |
8eebd221 |
574 | sk_tcp_set_private_ptr, |
575 | sk_tcp_get_private_ptr, |
576 | sk_tcp_set_frozen, |
d74d141c |
577 | sk_tcp_socket_error |
578 | }; |
579 | |
580 | DWORD err; |
581 | char *errstr; |
582 | Actual_Socket ret; |
583 | |
584 | /* |
585 | * Create Socket structure. |
586 | */ |
3d88e64d |
587 | ret = snew(struct Socket_tag); |
d74d141c |
588 | ret->fn = &fn_table; |
589 | ret->error = NULL; |
590 | ret->plug = plug; |
5471d09a |
591 | bufchain_init(&ret->output_data); |
d74d141c |
592 | ret->writable = 1; /* to start with */ |
593 | ret->sending_oob = 0; |
594 | ret->frozen = 1; |
5471d09a |
595 | ret->frozen_readable = 0; |
bc4802a1 |
596 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
597 | ret->pending_error = 0; |
d74d141c |
598 | |
599 | ret->s = (SOCKET)sock; |
600 | |
601 | if (ret->s == INVALID_SOCKET) { |
7440fd44 |
602 | err = p_WSAGetLastError(); |
d74d141c |
603 | ret->error = winsock_error_string(err); |
604 | return (Socket) ret; |
605 | } |
606 | |
607 | ret->oobinline = 0; |
608 | |
609 | /* Set up a select mechanism. This could be an AsyncSelect on a |
610 | * window, or an EventSelect on an event object. */ |
611 | errstr = do_select(ret->s, 1); |
612 | if (errstr) { |
613 | ret->error = errstr; |
614 | return (Socket) ret; |
615 | } |
616 | |
617 | add234(sktree, ret); |
618 | |
619 | return (Socket) ret; |
620 | } |
621 | |
4b1e8acc |
622 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
2184a5d9 |
623 | int nodelay, Plug plug) |
7e78000d |
624 | { |
c85623f9 |
625 | static const struct socket_function_table fn_table = { |
7e78000d |
626 | sk_tcp_plug, |
627 | sk_tcp_close, |
628 | sk_tcp_write, |
629 | sk_tcp_write_oob, |
630 | sk_tcp_flush, |
8eebd221 |
631 | sk_tcp_set_private_ptr, |
632 | sk_tcp_get_private_ptr, |
633 | sk_tcp_set_frozen, |
7e78000d |
634 | sk_tcp_socket_error |
635 | }; |
636 | |
2f75bae1 |
637 | SOCKET s; |
c4d8e107 |
638 | #ifdef IPV6 |
639 | SOCKADDR_IN6 a6; |
640 | #endif |
2f75bae1 |
641 | SOCKADDR_IN a; |
642 | DWORD err; |
643 | char *errstr; |
7e78000d |
644 | Actual_Socket ret; |
c91409da |
645 | short localport; |
2f75bae1 |
646 | |
647 | /* |
648 | * Create Socket structure. |
649 | */ |
3d88e64d |
650 | ret = snew(struct Socket_tag); |
7e78000d |
651 | ret->fn = &fn_table; |
2f75bae1 |
652 | ret->error = NULL; |
7e78000d |
653 | ret->plug = plug; |
5471d09a |
654 | bufchain_init(&ret->output_data); |
3ad9d396 |
655 | ret->connected = 0; /* to start with */ |
656 | ret->writable = 0; /* to start with */ |
33232c8f |
657 | ret->sending_oob = 0; |
d74d141c |
658 | ret->frozen = 0; |
5471d09a |
659 | ret->frozen_readable = 0; |
bc4802a1 |
660 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
661 | ret->pending_error = 0; |
2f75bae1 |
662 | |
663 | /* |
664 | * Open socket. |
665 | */ |
b7a189f3 |
666 | assert(addr->family != AF_UNSPEC); |
7440fd44 |
667 | s = p_socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
668 | ret->s = s; |
669 | |
670 | if (s == INVALID_SOCKET) { |
7440fd44 |
671 | err = p_WSAGetLastError(); |
32874aea |
672 | ret->error = winsock_error_string(err); |
7e78000d |
673 | return (Socket) ret; |
2f75bae1 |
674 | } |
4b1e8acc |
675 | |
676 | ret->oobinline = oobinline; |
677 | if (oobinline) { |
1ad4eb6f |
678 | BOOL b = TRUE; |
7440fd44 |
679 | p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
680 | } |
2f75bae1 |
681 | |
2184a5d9 |
682 | if (nodelay) { |
683 | BOOL b = TRUE; |
7440fd44 |
684 | p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
2184a5d9 |
685 | } |
686 | |
2f75bae1 |
687 | /* |
688 | * Bind to local address. |
689 | */ |
c91409da |
690 | if (privport) |
32874aea |
691 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
692 | else |
32874aea |
693 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
694 | |
695 | /* Loop round trying to bind */ |
696 | while (1) { |
32874aea |
697 | int retcode; |
c91409da |
698 | |
699 | #ifdef IPV6 |
32874aea |
700 | if (addr->family == AF_INET6) { |
701 | memset(&a6, 0, sizeof(a6)); |
702 | a6.sin6_family = AF_INET6; |
703 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
7440fd44 |
704 | a6.sin6_port = p_htons(localport); |
32874aea |
705 | } else |
c4d8e107 |
706 | #endif |
32874aea |
707 | { |
708 | a.sin_family = AF_INET; |
7440fd44 |
709 | a.sin_addr.s_addr = p_htonl(INADDR_ANY); |
710 | a.sin_port = p_htons(localport); |
32874aea |
711 | } |
c4d8e107 |
712 | #ifdef IPV6 |
7440fd44 |
713 | retcode = p_bind(s, (addr->family == AF_INET6 ? |
32874aea |
714 | (struct sockaddr *) &a6 : |
715 | (struct sockaddr *) &a), |
716 | (addr->family == |
717 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
718 | #else |
7440fd44 |
719 | retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
720 | #endif |
32874aea |
721 | if (retcode != SOCKET_ERROR) { |
722 | err = 0; |
723 | break; /* done */ |
724 | } else { |
7440fd44 |
725 | err = p_WSAGetLastError(); |
32874aea |
726 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
727 | break; |
728 | } |
729 | |
730 | if (localport == 0) |
731 | break; /* we're only looping once */ |
732 | localport--; |
733 | if (localport == 0) |
734 | break; /* we might have got to the end */ |
c91409da |
735 | } |
736 | |
32874aea |
737 | if (err) { |
c4d8e107 |
738 | ret->error = winsock_error_string(err); |
7e78000d |
739 | return (Socket) ret; |
2f75bae1 |
740 | } |
741 | |
742 | /* |
743 | * Connect to remote address. |
744 | */ |
c4d8e107 |
745 | #ifdef IPV6 |
32874aea |
746 | if (addr->family == AF_INET6) { |
747 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
748 | a6.sin6_family = AF_INET6; |
7440fd44 |
749 | a6.sin6_port = p_htons((short) port); |
32874aea |
750 | a6.sin6_addr = |
751 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
752 | } else |
c4d8e107 |
753 | #endif |
32874aea |
754 | { |
c4d8e107 |
755 | a.sin_family = AF_INET; |
7440fd44 |
756 | a.sin_addr.s_addr = p_htonl(addr->address); |
757 | a.sin_port = p_htons((short) port); |
c4d8e107 |
758 | } |
3ad9d396 |
759 | |
760 | /* Set up a select mechanism. This could be an AsyncSelect on a |
761 | * window, or an EventSelect on an event object. */ |
762 | errstr = do_select(s, 1); |
763 | if (errstr) { |
764 | ret->error = errstr; |
765 | return (Socket) ret; |
766 | } |
767 | |
32874aea |
768 | if (( |
769 | #ifdef IPV6 |
7440fd44 |
770 | p_connect(s, ((addr->family == AF_INET6) ? |
32874aea |
771 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
772 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
773 | #else |
7440fd44 |
774 | p_connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
775 | #endif |
32874aea |
776 | ) == SOCKET_ERROR) { |
7440fd44 |
777 | err = p_WSAGetLastError(); |
3ad9d396 |
778 | /* |
779 | * We expect a potential EWOULDBLOCK here, because the |
780 | * chances are the front end has done a select for |
781 | * FD_CONNECT, so that connect() will complete |
782 | * asynchronously. |
783 | */ |
784 | if ( err != WSAEWOULDBLOCK ) { |
785 | ret->error = winsock_error_string(err); |
786 | return (Socket) ret; |
787 | } |
788 | } else { |
789 | /* |
790 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
791 | * and we should set the socket as writable. |
792 | */ |
793 | ret->writable = 1; |
2f75bae1 |
794 | } |
795 | |
796 | add234(sktree, ret); |
797 | |
f85e6f6e |
798 | /* We're done with 'addr' now. */ |
799 | sk_addr_free(addr); |
800 | |
7e78000d |
801 | return (Socket) ret; |
2f75bae1 |
802 | } |
803 | |
6ee9b735 |
804 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) |
d74d141c |
805 | { |
c85623f9 |
806 | static const struct socket_function_table fn_table = { |
d74d141c |
807 | sk_tcp_plug, |
808 | sk_tcp_close, |
809 | sk_tcp_write, |
810 | sk_tcp_write_oob, |
811 | sk_tcp_flush, |
8eebd221 |
812 | sk_tcp_set_private_ptr, |
813 | sk_tcp_get_private_ptr, |
814 | sk_tcp_set_frozen, |
d74d141c |
815 | sk_tcp_socket_error |
816 | }; |
817 | |
818 | SOCKET s; |
819 | #ifdef IPV6 |
820 | SOCKADDR_IN6 a6; |
821 | #endif |
822 | SOCKADDR_IN a; |
823 | DWORD err; |
824 | char *errstr; |
825 | Actual_Socket ret; |
826 | int retcode; |
827 | int on = 1; |
828 | |
829 | /* |
830 | * Create Socket structure. |
831 | */ |
3d88e64d |
832 | ret = snew(struct Socket_tag); |
d74d141c |
833 | ret->fn = &fn_table; |
834 | ret->error = NULL; |
835 | ret->plug = plug; |
5471d09a |
836 | bufchain_init(&ret->output_data); |
d74d141c |
837 | ret->writable = 0; /* to start with */ |
838 | ret->sending_oob = 0; |
839 | ret->frozen = 0; |
5471d09a |
840 | ret->frozen_readable = 0; |
bc4802a1 |
841 | ret->localhost_only = local_host_only; |
7732d38a |
842 | ret->pending_error = 0; |
d74d141c |
843 | |
844 | /* |
845 | * Open socket. |
846 | */ |
7440fd44 |
847 | s = p_socket(AF_INET, SOCK_STREAM, 0); |
d74d141c |
848 | ret->s = s; |
849 | |
850 | if (s == INVALID_SOCKET) { |
7440fd44 |
851 | err = p_WSAGetLastError(); |
d74d141c |
852 | ret->error = winsock_error_string(err); |
853 | return (Socket) ret; |
854 | } |
855 | |
856 | ret->oobinline = 0; |
857 | |
7440fd44 |
858 | p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
d74d141c |
859 | |
d74d141c |
860 | #ifdef IPV6 |
861 | if (addr->family == AF_INET6) { |
862 | memset(&a6, 0, sizeof(a6)); |
863 | a6.sin6_family = AF_INET6; |
6ee9b735 |
864 | /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't |
865 | * know how to do it. :-) */ |
bcce45ed |
866 | if (local_host_only) |
867 | a6.sin6_addr = in6addr_loopback; |
868 | else |
869 | a6.sin6_addr = in6addr_any; |
7440fd44 |
870 | a6.sin6_port = p_htons(port); |
d74d141c |
871 | } else |
872 | #endif |
873 | { |
6ee9b735 |
874 | int got_addr = 0; |
d74d141c |
875 | a.sin_family = AF_INET; |
6ee9b735 |
876 | |
877 | /* |
878 | * Bind to source address. First try an explicitly |
879 | * specified one... |
880 | */ |
881 | if (srcaddr) { |
7440fd44 |
882 | a.sin_addr.s_addr = p_inet_addr(srcaddr); |
6ee9b735 |
883 | if (a.sin_addr.s_addr != INADDR_NONE) { |
884 | /* Override localhost_only with specified listen addr. */ |
885 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
886 | got_addr = 1; |
887 | } |
888 | } |
889 | |
890 | /* |
891 | * ... and failing that, go with one of the standard ones. |
892 | */ |
893 | if (!got_addr) { |
894 | if (local_host_only) |
7440fd44 |
895 | a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK); |
6ee9b735 |
896 | else |
7440fd44 |
897 | a.sin_addr.s_addr = p_htonl(INADDR_ANY); |
6ee9b735 |
898 | } |
899 | |
7440fd44 |
900 | a.sin_port = p_htons((short)port); |
d74d141c |
901 | } |
902 | #ifdef IPV6 |
7440fd44 |
903 | retcode = p_bind(s, (addr->family == AF_INET6 ? |
d74d141c |
904 | (struct sockaddr *) &a6 : |
905 | (struct sockaddr *) &a), |
906 | (addr->family == |
907 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
908 | #else |
7440fd44 |
909 | retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a)); |
d74d141c |
910 | #endif |
911 | if (retcode != SOCKET_ERROR) { |
912 | err = 0; |
913 | } else { |
7440fd44 |
914 | err = p_WSAGetLastError(); |
d74d141c |
915 | } |
916 | |
917 | if (err) { |
918 | ret->error = winsock_error_string(err); |
919 | return (Socket) ret; |
920 | } |
921 | |
922 | |
7440fd44 |
923 | if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) { |
924 | p_closesocket(s); |
d74d141c |
925 | ret->error = winsock_error_string(err); |
926 | return (Socket) ret; |
927 | } |
928 | |
929 | /* Set up a select mechanism. This could be an AsyncSelect on a |
930 | * window, or an EventSelect on an event object. */ |
931 | errstr = do_select(s, 1); |
932 | if (errstr) { |
933 | ret->error = errstr; |
934 | return (Socket) ret; |
935 | } |
936 | |
937 | add234(sktree, ret); |
938 | |
939 | return (Socket) ret; |
940 | } |
941 | |
32874aea |
942 | static void sk_tcp_close(Socket sock) |
943 | { |
9c964e85 |
944 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
945 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
946 | |
2f75bae1 |
947 | del234(sktree, s); |
948 | do_select(s->s, 0); |
7440fd44 |
949 | p_closesocket(s->s); |
dcbde236 |
950 | sfree(s); |
2f75bae1 |
951 | } |
952 | |
2f75bae1 |
953 | /* |
954 | * The function which tries to send on a socket once it's deemed |
955 | * writable. |
956 | */ |
32874aea |
957 | void try_send(Actual_Socket s) |
958 | { |
5471d09a |
959 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
2f75bae1 |
960 | int nsent; |
961 | DWORD err; |
5471d09a |
962 | void *data; |
32874aea |
963 | int len, urgentflag; |
964 | |
965 | if (s->sending_oob) { |
966 | urgentflag = MSG_OOB; |
967 | len = s->sending_oob; |
5471d09a |
968 | data = &s->oobdata; |
32874aea |
969 | } else { |
970 | urgentflag = 0; |
5471d09a |
971 | bufchain_prefix(&s->output_data, &data, &len); |
32874aea |
972 | } |
7440fd44 |
973 | nsent = p_send(s->s, data, len, urgentflag); |
32874aea |
974 | noise_ultralight(nsent); |
2f75bae1 |
975 | if (nsent <= 0) { |
7440fd44 |
976 | err = (nsent < 0 ? p_WSAGetLastError() : 0); |
e5eb3a1c |
977 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
978 | /* |
979 | * Perfectly normal: we've sent all we can for the moment. |
980 | * |
e5eb3a1c |
981 | * (Some WinSock send() implementations can return |
982 | * <0 but leave no sensible error indication - |
983 | * WSAGetLastError() is called but returns zero or |
984 | * a small number - so we check that case and treat |
985 | * it just like WSAEWOULDBLOCK.) |
d40a94b9 |
986 | */ |
2f75bae1 |
987 | s->writable = FALSE; |
32874aea |
988 | return; |
2f75bae1 |
989 | } else if (nsent == 0 || |
32874aea |
990 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
991 | /* |
7732d38a |
992 | * If send() returns CONNABORTED or CONNRESET, we |
993 | * unfortunately can't just call plug_closing(), |
994 | * because it's quite likely that we're currently |
995 | * _in_ a call from the code we'd be calling back |
996 | * to, so we'd have to make half the SSH code |
997 | * reentrant. Instead we flag a pending error on |
998 | * the socket, to be dealt with (by calling |
999 | * plug_closing()) at some suitable future moment. |
32874aea |
1000 | */ |
7732d38a |
1001 | s->pending_error = err; |
1002 | return; |
2f75bae1 |
1003 | } else { |
a8327734 |
1004 | /* We're inside the Windows frontend here, so we know |
1005 | * that the frontend handle is unnecessary. */ |
1006 | logevent(NULL, winsock_error_string(err)); |
247308b5 |
1007 | fatalbox("%s", winsock_error_string(err)); |
2f75bae1 |
1008 | } |
1009 | } else { |
5471d09a |
1010 | if (s->sending_oob) { |
1011 | if (nsent < len) { |
1012 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
1013 | s->sending_oob = len - nsent; |
1014 | } else { |
1015 | s->sending_oob = 0; |
1016 | } |
1017 | } else { |
1018 | bufchain_consume(&s->output_data, nsent); |
2f75bae1 |
1019 | } |
1020 | } |
1021 | } |
1022 | } |
1023 | |
e0e7dff8 |
1024 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
32874aea |
1025 | { |
7e78000d |
1026 | Actual_Socket s = (Actual_Socket) sock; |
1027 | |
2f75bae1 |
1028 | /* |
1029 | * Add the data to the buffer list on the socket. |
1030 | */ |
5471d09a |
1031 | bufchain_add(&s->output_data, buf, len); |
2f75bae1 |
1032 | |
1033 | /* |
1034 | * Now try sending from the start of the buffer list. |
1035 | */ |
1036 | if (s->writable) |
1037 | try_send(s); |
5471d09a |
1038 | |
1039 | return bufchain_size(&s->output_data); |
2f75bae1 |
1040 | } |
1041 | |
e0e7dff8 |
1042 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
32874aea |
1043 | { |
7e78000d |
1044 | Actual_Socket s = (Actual_Socket) sock; |
1045 | |
2f75bae1 |
1046 | /* |
1047 | * Replace the buffer list on the socket with the data. |
1048 | */ |
5471d09a |
1049 | bufchain_clear(&s->output_data); |
1050 | assert(len <= sizeof(s->oobdata)); |
1051 | memcpy(s->oobdata, buf, len); |
2f75bae1 |
1052 | s->sending_oob = len; |
1053 | |
1054 | /* |
1055 | * Now try sending from the start of the buffer list. |
1056 | */ |
1057 | if (s->writable) |
1058 | try_send(s); |
5471d09a |
1059 | |
1060 | return s->sending_oob; |
2f75bae1 |
1061 | } |
1062 | |
32874aea |
1063 | int select_result(WPARAM wParam, LPARAM lParam) |
1064 | { |
f9d3f227 |
1065 | int ret, open; |
2f75bae1 |
1066 | DWORD err; |
b675c612 |
1067 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
1068 | Actual_Socket s; |
49bad831 |
1069 | u_long atmark; |
2f75bae1 |
1070 | |
1071 | /* wParam is the socket itself */ |
cc8b0ee9 |
1072 | |
ce6fcfa5 |
1073 | if (wParam == 0) |
1074 | return 1; /* boggle */ |
cc8b0ee9 |
1075 | |
32874aea |
1076 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
1077 | if (!s) |
1078 | return 1; /* boggle */ |
1079 | |
1080 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
1081 | /* |
1082 | * An error has occurred on this socket. Pass it to the |
1083 | * plug. |
1084 | */ |
1085 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
1086 | } |
1087 | |
7d6ee6ff |
1088 | noise_ultralight(lParam); |
1089 | |
2f75bae1 |
1090 | switch (WSAGETSELECTEVENT(lParam)) { |
3ad9d396 |
1091 | case FD_CONNECT: |
1092 | s->connected = s->writable = 1; |
1093 | break; |
2f75bae1 |
1094 | case FD_READ: |
d74d141c |
1095 | /* In the case the socket is still frozen, we don't even bother */ |
5471d09a |
1096 | if (s->frozen) { |
1097 | s->frozen_readable = 1; |
d74d141c |
1098 | break; |
5471d09a |
1099 | } |
d74d141c |
1100 | |
32874aea |
1101 | /* |
1102 | * We have received data on the socket. For an oobinline |
1103 | * socket, this might be data _before_ an urgent pointer, |
1104 | * in which case we send it to the back end with type==1 |
1105 | * (data prior to urgent). |
1106 | */ |
1107 | if (s->oobinline) { |
1108 | atmark = 1; |
7440fd44 |
1109 | p_ioctlsocket(s->s, SIOCATMARK, &atmark); |
32874aea |
1110 | /* |
1111 | * Avoid checking the return value from ioctlsocket(), |
1112 | * on the grounds that some WinSock wrappers don't |
1113 | * support it. If it does nothing, we get atmark==1, |
1114 | * which is equivalent to `no OOB pending', so the |
1115 | * effect will be to non-OOB-ify any OOB data. |
1116 | */ |
1117 | } else |
1118 | atmark = 1; |
4b1e8acc |
1119 | |
7440fd44 |
1120 | ret = p_recv(s->s, buf, sizeof(buf), 0); |
32874aea |
1121 | noise_ultralight(ret); |
2f75bae1 |
1122 | if (ret < 0) { |
7440fd44 |
1123 | err = p_WSAGetLastError(); |
2f75bae1 |
1124 | if (err == WSAEWOULDBLOCK) { |
1125 | break; |
1126 | } |
1127 | } |
1128 | if (ret < 0) { |
32874aea |
1129 | return plug_closing(s->plug, winsock_error_string(err), err, |
1130 | 0); |
7e78000d |
1131 | } else if (0 == ret) { |
32874aea |
1132 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
1133 | } else { |
32874aea |
1134 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
1135 | } |
1136 | break; |
1137 | case FD_OOB: |
32874aea |
1138 | /* |
1139 | * This will only happen on a non-oobinline socket. It |
1140 | * indicates that we can immediately perform an OOB read |
1141 | * and get back OOB data, which we will send to the back |
1142 | * end with type==2 (urgent data). |
1143 | */ |
7440fd44 |
1144 | ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB); |
32874aea |
1145 | noise_ultralight(ret); |
1146 | if (ret <= 0) { |
247308b5 |
1147 | char *str = (ret == 0 ? "Internal networking trouble" : |
7440fd44 |
1148 | winsock_error_string(p_WSAGetLastError())); |
a8327734 |
1149 | /* We're inside the Windows frontend here, so we know |
1150 | * that the frontend handle is unnecessary. */ |
1151 | logevent(NULL, str); |
247308b5 |
1152 | fatalbox("%s", str); |
32874aea |
1153 | } else { |
1154 | return plug_receive(s->plug, 2, buf, ret); |
1155 | } |
1156 | break; |
2f75bae1 |
1157 | case FD_WRITE: |
5471d09a |
1158 | { |
1159 | int bufsize_before, bufsize_after; |
1160 | s->writable = 1; |
1161 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1162 | try_send(s); |
1163 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1164 | if (bufsize_after < bufsize_before) |
1165 | plug_sent(s->plug, bufsize_after); |
1166 | } |
2f75bae1 |
1167 | break; |
1168 | case FD_CLOSE: |
f9d3f227 |
1169 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
1170 | open = 1; |
1171 | do { |
7440fd44 |
1172 | ret = p_recv(s->s, buf, sizeof(buf), 0); |
32874aea |
1173 | if (ret < 0) { |
7440fd44 |
1174 | err = p_WSAGetLastError(); |
32874aea |
1175 | if (err == WSAEWOULDBLOCK) |
1176 | break; |
1177 | return plug_closing(s->plug, winsock_error_string(err), |
1178 | err, 0); |
1179 | } else { |
1180 | if (ret) |
1181 | open &= plug_receive(s->plug, 0, buf, ret); |
1182 | else |
1183 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
1184 | } |
f9d3f227 |
1185 | } while (ret > 0); |
32874aea |
1186 | return open; |
d74d141c |
1187 | case FD_ACCEPT: |
1188 | { |
bc4802a1 |
1189 | struct sockaddr_in isa; |
1190 | int addrlen = sizeof(struct sockaddr_in); |
bcce45ed |
1191 | SOCKET t; /* socket of connection */ |
1192 | |
bc4802a1 |
1193 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
bcce45ed |
1194 | err = 0; |
7440fd44 |
1195 | t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen); |
bcce45ed |
1196 | if (t == INVALID_SOCKET) |
1197 | { |
7440fd44 |
1198 | err = p_WSAGetLastError(); |
bcce45ed |
1199 | if (err == WSATRY_AGAIN) |
1200 | break; |
1201 | } |
1202 | |
6ee9b735 |
1203 | if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { |
7440fd44 |
1204 | p_closesocket(t); /* dodgy WinSock let nonlocal through */ |
bc4802a1 |
1205 | } else if (plug_accepting(s->plug, (void*)t)) { |
7440fd44 |
1206 | p_closesocket(t); /* denied or error */ |
bcce45ed |
1207 | } |
d74d141c |
1208 | } |
2f75bae1 |
1209 | } |
1210 | |
1211 | return 1; |
1212 | } |
1213 | |
1214 | /* |
7732d38a |
1215 | * Deal with socket errors detected in try_send(). |
1216 | */ |
1217 | void net_pending_errors(void) |
1218 | { |
1219 | int i; |
1220 | Actual_Socket s; |
1221 | |
1222 | /* |
1223 | * This might be a fiddly business, because it's just possible |
1224 | * that handling a pending error on one socket might cause |
1225 | * others to be closed. (I can't think of any reason this might |
1226 | * happen in current SSH implementation, but to maintain |
1227 | * generality of this network layer I'll assume the worst.) |
1228 | * |
1229 | * So what we'll do is search the socket list for _one_ socket |
1230 | * with a pending error, and then handle it, and then search |
1231 | * the list again _from the beginning_. Repeat until we make a |
1232 | * pass with no socket errors present. That way we are |
1233 | * protected against the socket list changing under our feet. |
1234 | */ |
1235 | |
1236 | do { |
1237 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1238 | if (s->pending_error) { |
1239 | /* |
1240 | * An error has occurred on this socket. Pass it to the |
1241 | * plug. |
1242 | */ |
1243 | plug_closing(s->plug, |
1244 | winsock_error_string(s->pending_error), |
1245 | s->pending_error, 0); |
1246 | break; |
1247 | } |
1248 | } |
1249 | } while (s); |
1250 | } |
1251 | |
1252 | /* |
2f75bae1 |
1253 | * Each socket abstraction contains a `void *' private field in |
1254 | * which the client can keep state. |
1255 | */ |
8eebd221 |
1256 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
32874aea |
1257 | { |
7e78000d |
1258 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1259 | s->private_ptr = ptr; |
1260 | } |
32874aea |
1261 | |
8eebd221 |
1262 | static void *sk_tcp_get_private_ptr(Socket sock) |
32874aea |
1263 | { |
7e78000d |
1264 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1265 | return s->private_ptr; |
1266 | } |
1267 | |
1268 | /* |
1269 | * Special error values are returned from sk_namelookup and sk_new |
1270 | * if there's a problem. These functions extract an error message, |
1271 | * or return NULL if there's no problem. |
1272 | */ |
cbe2d68f |
1273 | const char *sk_addr_error(SockAddr addr) |
32874aea |
1274 | { |
2f75bae1 |
1275 | return addr->error; |
1276 | } |
cbe2d68f |
1277 | static const char *sk_tcp_socket_error(Socket sock) |
32874aea |
1278 | { |
7e78000d |
1279 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1280 | return s->error; |
1281 | } |
1282 | |
8eebd221 |
1283 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
d74d141c |
1284 | { |
1285 | Actual_Socket s = (Actual_Socket) sock; |
5471d09a |
1286 | if (s->frozen == is_frozen) |
1287 | return; |
d74d141c |
1288 | s->frozen = is_frozen; |
5471d09a |
1289 | if (!is_frozen && s->frozen_readable) { |
d74d141c |
1290 | char c; |
7440fd44 |
1291 | p_recv(s->s, &c, 1, MSG_PEEK); |
d74d141c |
1292 | } |
5471d09a |
1293 | s->frozen_readable = 0; |
d74d141c |
1294 | } |
1295 | |
2f75bae1 |
1296 | /* |
1297 | * For Plink: enumerate all sockets currently active. |
1298 | */ |
32874aea |
1299 | SOCKET first_socket(int *state) |
1300 | { |
d2371c81 |
1301 | Actual_Socket s; |
1302 | *state = 0; |
1303 | s = index234(sktree, (*state)++); |
2f75bae1 |
1304 | return s ? s->s : INVALID_SOCKET; |
1305 | } |
32874aea |
1306 | |
1307 | SOCKET next_socket(int *state) |
1308 | { |
d2371c81 |
1309 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
1310 | return s ? s->s : INVALID_SOCKET; |
1311 | } |
68a49acb |
1312 | |
1313 | int net_service_lookup(char *service) |
1314 | { |
1315 | struct servent *se; |
7440fd44 |
1316 | se = p_getservbyname(service, NULL); |
68a49acb |
1317 | if (se != NULL) |
7440fd44 |
1318 | return p_ntohs(se->s_port); |
68a49acb |
1319 | else |
1320 | return 0; |
1321 | } |