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source: vbox/trunk/src/libs/openssl-1.1.1l/apps/s_socket.c@ 91772

Last change on this file since 91772 was 91772, checked in by vboxsync, 3 years ago

openssl-1.1.1l: Applied and adjusted our OpenSSL changes to 1.1.1l. bugref:10126

File size: 13.9 KB
Line 
1/*
2 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/* socket-related functions used by s_client and s_server */
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <errno.h>
15#include <signal.h>
16#include <openssl/opensslconf.h>
17
18/*
19 * With IPv6, it looks like Digital has mixed up the proper order of
20 * recursive header file inclusion, resulting in the compiler complaining
21 * that u_int isn't defined, but only if _POSIX_C_SOURCE is defined, which is
22 * needed to have fileno() declared correctly... So let's define u_int
23 */
24#if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
25# define __U_INT
26typedef unsigned int u_int;
27#endif
28
29#ifndef OPENSSL_NO_SOCK
30
31# include "apps.h"
32# include "s_apps.h"
33# include "internal/sockets.h"
34
35# include <openssl/bio.h>
36# include <openssl/err.h>
37
38/* Keep track of our peer's address for the cookie callback */
39BIO_ADDR *ourpeer = NULL;
40
41/*
42 * init_client - helper routine to set up socket communication
43 * @sock: pointer to storage of resulting socket.
44 * @host: the host name or path (for AF_UNIX) to connect to.
45 * @port: the port to connect to (ignored for AF_UNIX).
46 * @bindhost: source host or path (for AF_UNIX).
47 * @bindport: source port (ignored for AF_UNIX).
48 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
49 * AF_UNSPEC
50 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
51 * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any)
52 *
53 * This will create a socket and use it to connect to a host:port, or if
54 * family == AF_UNIX, to the path found in host.
55 *
56 * If the host has more than one address, it will try them one by one until
57 * a successful connection is established. The resulting socket will be
58 * found in *sock on success, it will be given INVALID_SOCKET otherwise.
59 *
60 * Returns 1 on success, 0 on failure.
61 */
62int init_client(int *sock, const char *host, const char *port,
63 const char *bindhost, const char *bindport,
64 int family, int type, int protocol)
65{
66 BIO_ADDRINFO *res = NULL;
67 BIO_ADDRINFO *bindaddr = NULL;
68 const BIO_ADDRINFO *ai = NULL;
69 const BIO_ADDRINFO *bi = NULL;
70 int found = 0;
71 int ret;
72
73 if (BIO_sock_init() != 1)
74 return 0;
75
76 ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol,
77 &res);
78 if (ret == 0) {
79 ERR_print_errors(bio_err);
80 return 0;
81 }
82
83 if (bindhost != NULL || bindport != NULL) {
84 ret = BIO_lookup_ex(bindhost, bindport, BIO_LOOKUP_CLIENT,
85 family, type, protocol, &bindaddr);
86 if (ret == 0) {
87 ERR_print_errors (bio_err);
88 goto out;
89 }
90 }
91
92 ret = 0;
93 for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
94 /* Admittedly, these checks are quite paranoid, we should not get
95 * anything in the BIO_ADDRINFO chain that we haven't
96 * asked for. */
97 OPENSSL_assert((family == AF_UNSPEC
98 || family == BIO_ADDRINFO_family(ai))
99 && (type == 0 || type == BIO_ADDRINFO_socktype(ai))
100 && (protocol == 0
101 || protocol == BIO_ADDRINFO_protocol(ai)));
102
103 if (bindaddr != NULL) {
104 for (bi = bindaddr; bi != NULL; bi = BIO_ADDRINFO_next(bi)) {
105 if (BIO_ADDRINFO_family(bi) == BIO_ADDRINFO_family(ai))
106 break;
107 }
108 if (bi == NULL)
109 continue;
110 ++found;
111 }
112
113 *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
114 BIO_ADDRINFO_protocol(ai), 0);
115 if (*sock == INVALID_SOCKET) {
116 /* Maybe the kernel doesn't support the socket family, even if
117 * BIO_lookup() added it in the returned result...
118 */
119 continue;
120 }
121
122 if (bi != NULL) {
123 if (!BIO_bind(*sock, BIO_ADDRINFO_address(bi),
124 BIO_SOCK_REUSEADDR)) {
125 BIO_closesocket(*sock);
126 *sock = INVALID_SOCKET;
127 break;
128 }
129 }
130
131#ifndef OPENSSL_NO_SCTP
132 if (protocol == IPPROTO_SCTP) {
133 /*
134 * For SCTP we have to set various options on the socket prior to
135 * connecting. This is done automatically by BIO_new_dgram_sctp().
136 * We don't actually need the created BIO though so we free it again
137 * immediately.
138 */
139 BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE);
140
141 if (tmpbio == NULL) {
142 ERR_print_errors(bio_err);
143 return 0;
144 }
145 BIO_free(tmpbio);
146 }
147#endif
148
149 if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai),
150 protocol == IPPROTO_TCP ? BIO_SOCK_NODELAY : 0)) {
151 BIO_closesocket(*sock);
152 *sock = INVALID_SOCKET;
153 continue;
154 }
155
156 /* Success, don't try any more addresses */
157 break;
158 }
159
160 if (*sock == INVALID_SOCKET) {
161 if (bindaddr != NULL && !found) {
162 BIO_printf(bio_err, "Can't bind %saddress for %s%s%s\n",
163 BIO_ADDRINFO_family(res) == AF_INET6 ? "IPv6 " :
164 BIO_ADDRINFO_family(res) == AF_INET ? "IPv4 " :
165 BIO_ADDRINFO_family(res) == AF_UNIX ? "unix " : "",
166 bindhost != NULL ? bindhost : "",
167 bindport != NULL ? ":" : "",
168 bindport != NULL ? bindport : "");
169 ERR_clear_error();
170 ret = 0;
171 }
172 ERR_print_errors(bio_err);
173 } else {
174 /* Remove any stale errors from previous connection attempts */
175 ERR_clear_error();
176 ret = 1;
177 }
178out:
179 if (bindaddr != NULL) {
180 BIO_ADDRINFO_free (bindaddr);
181 }
182 BIO_ADDRINFO_free(res);
183 return ret;
184}
185
186/*
187 * do_server - helper routine to perform a server operation
188 * @accept_sock: pointer to storage of resulting socket.
189 * @host: the host name or path (for AF_UNIX) to connect to.
190 * @port: the port to connect to (ignored for AF_UNIX).
191 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
192 * AF_UNSPEC
193 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
194 * @cb: pointer to a function that receives the accepted socket and
195 * should perform the communication with the connecting client.
196 * @context: pointer to memory that's passed verbatim to the cb function.
197 * @naccept: number of times an incoming connect should be accepted. If -1,
198 * unlimited number.
199 *
200 * This will create a socket and use it to listen to a host:port, or if
201 * family == AF_UNIX, to the path found in host, then start accepting
202 * incoming connections and run cb on the resulting socket.
203 *
204 * 0 on failure, something other on success.
205 */
206int do_server(int *accept_sock, const char *host, const char *port,
207 int family, int type, int protocol, do_server_cb cb,
208 unsigned char *context, int naccept, BIO *bio_s_out)
209{
210 int asock = 0;
211 int sock;
212 int i;
213 BIO_ADDRINFO *res = NULL;
214 const BIO_ADDRINFO *next;
215 int sock_family, sock_type, sock_protocol, sock_port;
216 const BIO_ADDR *sock_address;
217 int sock_family_fallback = AF_UNSPEC;
218 const BIO_ADDR *sock_address_fallback = NULL;
219 int sock_options = BIO_SOCK_REUSEADDR;
220 int ret = 0;
221
222 if (BIO_sock_init() != 1)
223 return 0;
224
225 if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol,
226 &res)) {
227 ERR_print_errors(bio_err);
228 return 0;
229 }
230
231 /* Admittedly, these checks are quite paranoid, we should not get
232 * anything in the BIO_ADDRINFO chain that we haven't asked for */
233 OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
234 && (type == 0 || type == BIO_ADDRINFO_socktype(res))
235 && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res)));
236
237 sock_family = BIO_ADDRINFO_family(res);
238 sock_type = BIO_ADDRINFO_socktype(res);
239 sock_protocol = BIO_ADDRINFO_protocol(res);
240 sock_address = BIO_ADDRINFO_address(res);
241 next = BIO_ADDRINFO_next(res);
242 if (sock_family == AF_INET6)
243 sock_options |= BIO_SOCK_V6_ONLY;
244 if (next != NULL
245 && BIO_ADDRINFO_socktype(next) == sock_type
246 && BIO_ADDRINFO_protocol(next) == sock_protocol) {
247 if (sock_family == AF_INET
248 && BIO_ADDRINFO_family(next) == AF_INET6) {
249 /* In case AF_INET6 is returned but not supported by the
250 * kernel, retry with the first detected address family */
251 sock_family_fallback = sock_family;
252 sock_address_fallback = sock_address;
253 sock_family = AF_INET6;
254 sock_address = BIO_ADDRINFO_address(next);
255 } else if (sock_family == AF_INET6
256 && BIO_ADDRINFO_family(next) == AF_INET) {
257 sock_options &= ~BIO_SOCK_V6_ONLY;
258 }
259 }
260
261 asock = BIO_socket(sock_family, sock_type, sock_protocol, 0);
262 if (asock == INVALID_SOCKET && sock_family_fallback != AF_UNSPEC) {
263 asock = BIO_socket(sock_family_fallback, sock_type, sock_protocol, 0);
264 sock_address = sock_address_fallback;
265 }
266 if (asock == INVALID_SOCKET
267 || !BIO_listen(asock, sock_address, sock_options)) {
268 BIO_ADDRINFO_free(res);
269 ERR_print_errors(bio_err);
270 if (asock != INVALID_SOCKET)
271 BIO_closesocket(asock);
272 goto end;
273 }
274
275#ifndef OPENSSL_NO_SCTP
276 if (protocol == IPPROTO_SCTP) {
277 /*
278 * For SCTP we have to set various options on the socket prior to
279 * accepting. This is done automatically by BIO_new_dgram_sctp().
280 * We don't actually need the created BIO though so we free it again
281 * immediately.
282 */
283 BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE);
284
285 if (tmpbio == NULL) {
286 BIO_closesocket(asock);
287 ERR_print_errors(bio_err);
288 goto end;
289 }
290 BIO_free(tmpbio);
291 }
292#endif
293
294 sock_port = BIO_ADDR_rawport(sock_address);
295
296 BIO_ADDRINFO_free(res);
297 res = NULL;
298
299 if (sock_port == 0) {
300 /* dynamically allocated port, report which one */
301 union BIO_sock_info_u info;
302 char *hostname = NULL;
303 char *service = NULL;
304 int success = 0;
305
306 if ((info.addr = BIO_ADDR_new()) != NULL
307 && BIO_sock_info(asock, BIO_SOCK_INFO_ADDRESS, &info)
308 && (hostname = BIO_ADDR_hostname_string(info.addr, 1)) != NULL
309 && (service = BIO_ADDR_service_string(info.addr, 1)) != NULL
310 && BIO_printf(bio_s_out,
311 strchr(hostname, ':') == NULL
312 ? /* IPv4 */ "ACCEPT %s:%s\n"
313 : /* IPv6 */ "ACCEPT [%s]:%s\n",
314 hostname, service) > 0)
315 success = 1;
316
317 (void)BIO_flush(bio_s_out);
318 OPENSSL_free(hostname);
319 OPENSSL_free(service);
320 BIO_ADDR_free(info.addr);
321 if (!success) {
322 BIO_closesocket(asock);
323 ERR_print_errors(bio_err);
324 goto end;
325 }
326 } else {
327 (void)BIO_printf(bio_s_out, "ACCEPT\n");
328 (void)BIO_flush(bio_s_out);
329 }
330
331 if (accept_sock != NULL)
332 *accept_sock = asock;
333 for (;;) {
334 char sink[64];
335 struct timeval timeout;
336 fd_set readfds;
337
338 if (type == SOCK_STREAM) {
339 BIO_ADDR_free(ourpeer);
340 ourpeer = BIO_ADDR_new();
341 if (ourpeer == NULL) {
342 BIO_closesocket(asock);
343 ERR_print_errors(bio_err);
344 goto end;
345 }
346 do {
347 sock = BIO_accept_ex(asock, ourpeer, 0);
348 } while (sock < 0 && BIO_sock_should_retry(sock));
349 if (sock < 0) {
350 ERR_print_errors(bio_err);
351 BIO_closesocket(asock);
352 break;
353 }
354 BIO_set_tcp_ndelay(sock, 1);
355 i = (*cb)(sock, type, protocol, context);
356
357 /*
358 * If we ended with an alert being sent, but still with data in the
359 * network buffer to be read, then calling BIO_closesocket() will
360 * result in a TCP-RST being sent. On some platforms (notably
361 * Windows) then this will result in the peer immediately abandoning
362 * the connection including any buffered alert data before it has
363 * had a chance to be read. Shutting down the sending side first,
364 * and then closing the socket sends TCP-FIN first followed by
365 * TCP-RST. This seems to allow the peer to read the alert data.
366 */
367 shutdown(sock, 1); /* SHUT_WR */
368 /*
369 * We just said we have nothing else to say, but it doesn't mean
370 * that the other side has nothing. It's even recommended to
371 * consume incoming data. [In testing context this ensures that
372 * alerts are passed on...]
373 */
374 timeout.tv_sec = 0;
375 timeout.tv_usec = 500000; /* some extreme round-trip */
376 do {
377 FD_ZERO(&readfds);
378 openssl_fdset(sock, &readfds);
379 } while (select(sock + 1, &readfds, NULL, NULL, &timeout) > 0
380 && readsocket(sock, sink, sizeof(sink)) > 0);
381
382 BIO_closesocket(sock);
383 } else {
384 i = (*cb)(asock, type, protocol, context);
385 }
386
387 if (naccept != -1)
388 naccept--;
389 if (i < 0 || naccept == 0) {
390 BIO_closesocket(asock);
391 ret = i;
392 break;
393 }
394 }
395 end:
396# ifdef AF_UNIX
397 if (family == AF_UNIX)
398 unlink(host);
399# endif
400 BIO_ADDR_free(ourpeer);
401 ourpeer = NULL;
402 return ret;
403}
404
405#endif /* OPENSSL_NO_SOCK */
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