2 * Copyright 1995-2022 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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
10 /* socket-related functions used by s_client and s_server */
16 #include <openssl/opensslconf.h>
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
24 #if defined(OPENSSL_SYS_VMS_DECC) && !defined(__U_INT)
26 typedef unsigned int u_int;
32 /* MSVC renamed some POSIX functions to have an underscore prefix. */
34 # define getpid _getpid
38 #ifndef OPENSSL_NO_SOCK
42 # include "internal/sockets.h"
44 # if defined(__TANDEM)
45 # if defined(OPENSSL_TANDEM_FLOSS)
46 # include <floss.h(floss_read)>
50 # include <openssl/bio.h>
51 # include <openssl/err.h>
53 /* Keep track of our peer's address for the cookie callback */
54 BIO_ADDR *ourpeer = NULL;
57 * init_client - helper routine to set up socket communication
58 * @sock: pointer to storage of resulting socket.
59 * @host: the hostname or path (for AF_UNIX) to connect to.
60 * @port: the port to connect to (ignored for AF_UNIX).
61 * @bindhost: source host or path (for AF_UNIX).
62 * @bindport: source port (ignored for AF_UNIX).
63 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
65 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
66 * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any)
67 * @tfo: flag to enable TCP Fast Open
68 * @doconn: whether we should call BIO_connect() on the socket
69 * @ba_ret: BIO_ADDR for the remote peer, to be freed by caller
71 * This will create a socket and use it to connect to a host:port, or if
72 * family == AF_UNIX, to the path found in host.
74 * If the host has more than one address, it will try them one by one until
75 * a successful connection is established. The resulting socket will be
76 * found in *sock on success, it will be given INVALID_SOCKET otherwise.
78 * Returns 1 on success, 0 on failure.
80 int init_client(int *sock, const char *host, const char *port,
81 const char *bindhost, const char *bindport,
82 int family, int type, int protocol, int tfo, int doconn,
85 BIO_ADDRINFO *res = NULL;
86 BIO_ADDRINFO *bindaddr = NULL;
87 const BIO_ADDRINFO *ai = NULL;
88 const BIO_ADDRINFO *bi = NULL;
93 if (tfo && ba_ret != NULL)
96 if (BIO_sock_init() != 1)
99 ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol,
102 ERR_print_errors(bio_err);
106 if (bindhost != NULL || bindport != NULL) {
107 ret = BIO_lookup_ex(bindhost, bindport, BIO_LOOKUP_CLIENT,
108 family, type, protocol, &bindaddr);
110 ERR_print_errors (bio_err);
116 for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
117 /* Admittedly, these checks are quite paranoid, we should not get
118 * anything in the BIO_ADDRINFO chain that we haven't
120 OPENSSL_assert((family == AF_UNSPEC
121 || family == BIO_ADDRINFO_family(ai))
122 && (type == 0 || type == BIO_ADDRINFO_socktype(ai))
124 || protocol == BIO_ADDRINFO_protocol(ai)));
126 if (bindaddr != NULL) {
127 for (bi = bindaddr; bi != NULL; bi = BIO_ADDRINFO_next(bi)) {
128 if (BIO_ADDRINFO_family(bi) == BIO_ADDRINFO_family(ai))
136 *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
137 BIO_ADDRINFO_protocol(ai), 0);
138 if (*sock == INVALID_SOCKET) {
139 /* Maybe the kernel doesn't support the socket family, even if
140 * BIO_lookup() added it in the returned result...
146 if (!BIO_bind(*sock, BIO_ADDRINFO_address(bi),
147 BIO_SOCK_REUSEADDR)) {
148 BIO_closesocket(*sock);
149 *sock = INVALID_SOCKET;
154 #ifndef OPENSSL_NO_SCTP
155 if (protocol == IPPROTO_SCTP) {
157 * For SCTP we have to set various options on the socket prior to
158 * connecting. This is done automatically by BIO_new_dgram_sctp().
159 * We don't actually need the created BIO though so we free it again
162 BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE);
164 if (tmpbio == NULL) {
165 ERR_print_errors(bio_err);
171 if (BIO_ADDRINFO_protocol(ai) == IPPROTO_TCP) {
172 options |= BIO_SOCK_NODELAY;
174 options |= BIO_SOCK_TFO;
177 if (doconn && !BIO_connect(*sock, BIO_ADDRINFO_address(ai), options)) {
178 BIO_closesocket(*sock);
179 *sock = INVALID_SOCKET;
183 /* Save the address */
185 *ba_ret = BIO_ADDR_dup(BIO_ADDRINFO_address(ai));
187 /* Success, don't try any more addresses */
191 if (*sock == INVALID_SOCKET) {
192 if (bindaddr != NULL && !found) {
193 BIO_printf(bio_err, "Can't bind %saddress for %s%s%s\n",
195 BIO_ADDRINFO_family(res) == AF_INET6 ? "IPv6 " :
197 BIO_ADDRINFO_family(res) == AF_INET ? "IPv4 " :
198 BIO_ADDRINFO_family(res) == AF_UNIX ? "unix " : "",
199 bindhost != NULL ? bindhost : "",
200 bindport != NULL ? ":" : "",
201 bindport != NULL ? bindport : "");
205 ERR_print_errors(bio_err);
207 char *hostname = NULL;
209 hostname = BIO_ADDR_hostname_string(BIO_ADDRINFO_address(ai), 1);
210 if (hostname != NULL) {
211 BIO_printf(bio_out, "Connecting to %s\n", hostname);
212 OPENSSL_free(hostname);
214 /* Remove any stale errors from previous connection attempts */
219 if (bindaddr != NULL) {
220 BIO_ADDRINFO_free (bindaddr);
222 BIO_ADDRINFO_free(res);
226 void get_sock_info_address(int asock, char **hostname, char **service)
228 union BIO_sock_info_u info;
230 if (hostname != NULL)
235 if ((info.addr = BIO_ADDR_new()) != NULL
236 && BIO_sock_info(asock, BIO_SOCK_INFO_ADDRESS, &info)) {
237 if (hostname != NULL)
238 *hostname = BIO_ADDR_hostname_string(info.addr, 1);
240 *service = BIO_ADDR_service_string(info.addr, 1);
242 BIO_ADDR_free(info.addr);
245 int report_server_accept(BIO *out, int asock, int with_address, int with_pid)
249 if (BIO_printf(out, "ACCEPT") <= 0)
252 char *hostname, *service;
254 get_sock_info_address(asock, &hostname, &service);
255 success = hostname != NULL && service != NULL;
257 success = BIO_printf(out,
258 strchr(hostname, ':') == NULL
259 ? /* IPv4 */ " %s:%s"
260 : /* IPv6 */ " [%s]:%s",
261 hostname, service) > 0;
263 (void)BIO_printf(out, "unknown:error\n");
264 OPENSSL_free(hostname);
265 OPENSSL_free(service);
268 success *= BIO_printf(out, " PID=%d", getpid()) > 0;
269 success *= BIO_printf(out, "\n") > 0;
270 (void)BIO_flush(out);
276 * do_server - helper routine to perform a server operation
277 * @accept_sock: pointer to storage of resulting socket.
278 * @host: the hostname or path (for AF_UNIX) to connect to.
279 * @port: the port to connect to (ignored for AF_UNIX).
280 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
282 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
283 * @cb: pointer to a function that receives the accepted socket and
284 * should perform the communication with the connecting client.
285 * @context: pointer to memory that's passed verbatim to the cb function.
286 * @naccept: number of times an incoming connect should be accepted. If -1,
289 * This will create a socket and use it to listen to a host:port, or if
290 * family == AF_UNIX, to the path found in host, then start accepting
291 * incoming connections and run cb on the resulting socket.
293 * 0 on failure, something other on success.
295 int do_server(int *accept_sock, const char *host, const char *port,
296 int family, int type, int protocol, do_server_cb cb,
297 unsigned char *context, int naccept, BIO *bio_s_out,
303 BIO_ADDRINFO *res = NULL;
304 const BIO_ADDRINFO *next;
305 int sock_family, sock_type, sock_protocol, sock_port;
306 const BIO_ADDR *sock_address;
307 int sock_family_fallback = AF_UNSPEC;
308 const BIO_ADDR *sock_address_fallback = NULL;
309 int sock_options = BIO_SOCK_REUSEADDR;
312 if (BIO_sock_init() != 1)
315 if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol,
317 ERR_print_errors(bio_err);
321 /* Admittedly, these checks are quite paranoid, we should not get
322 * anything in the BIO_ADDRINFO chain that we haven't asked for */
323 OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
324 && (type == 0 || type == BIO_ADDRINFO_socktype(res))
325 && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res)));
327 sock_family = BIO_ADDRINFO_family(res);
328 sock_type = BIO_ADDRINFO_socktype(res);
329 sock_protocol = BIO_ADDRINFO_protocol(res);
330 sock_address = BIO_ADDRINFO_address(res);
331 next = BIO_ADDRINFO_next(res);
332 if (tfo && sock_type == SOCK_STREAM)
333 sock_options |= BIO_SOCK_TFO;
335 if (sock_family == AF_INET6)
336 sock_options |= BIO_SOCK_V6_ONLY;
338 && BIO_ADDRINFO_socktype(next) == sock_type
339 && BIO_ADDRINFO_protocol(next) == sock_protocol) {
340 if (sock_family == AF_INET
341 && BIO_ADDRINFO_family(next) == AF_INET6) {
342 /* In case AF_INET6 is returned but not supported by the
343 * kernel, retry with the first detected address family */
344 sock_family_fallback = sock_family;
345 sock_address_fallback = sock_address;
346 sock_family = AF_INET6;
347 sock_address = BIO_ADDRINFO_address(next);
348 } else if (sock_family == AF_INET6
349 && BIO_ADDRINFO_family(next) == AF_INET) {
350 sock_options &= ~BIO_SOCK_V6_ONLY;
355 asock = BIO_socket(sock_family, sock_type, sock_protocol, 0);
356 if (asock == INVALID_SOCKET && sock_family_fallback != AF_UNSPEC) {
357 asock = BIO_socket(sock_family_fallback, sock_type, sock_protocol, 0);
358 sock_address = sock_address_fallback;
360 if (asock == INVALID_SOCKET
361 || !BIO_listen(asock, sock_address, sock_options)) {
362 BIO_ADDRINFO_free(res);
363 ERR_print_errors(bio_err);
364 if (asock != INVALID_SOCKET)
365 BIO_closesocket(asock);
369 #ifndef OPENSSL_NO_SCTP
370 if (protocol == IPPROTO_SCTP) {
372 * For SCTP we have to set various options on the socket prior to
373 * accepting. This is done automatically by BIO_new_dgram_sctp().
374 * We don't actually need the created BIO though so we free it again
377 BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE);
379 if (tmpbio == NULL) {
380 BIO_closesocket(asock);
381 ERR_print_errors(bio_err);
388 sock_port = BIO_ADDR_rawport(sock_address);
390 BIO_ADDRINFO_free(res);
393 if (!report_server_accept(bio_s_out, asock, sock_port == 0, 0)) {
394 BIO_closesocket(asock);
395 ERR_print_errors(bio_err);
399 if (accept_sock != NULL)
400 *accept_sock = asock;
403 struct timeval timeout;
406 if (type == SOCK_STREAM) {
407 BIO_ADDR_free(ourpeer);
408 ourpeer = BIO_ADDR_new();
409 if (ourpeer == NULL) {
410 BIO_closesocket(asock);
411 ERR_print_errors(bio_err);
415 sock = BIO_accept_ex(asock, ourpeer, 0);
416 } while (sock < 0 && BIO_sock_should_retry(sock));
418 ERR_print_errors(bio_err);
419 BIO_closesocket(asock);
422 BIO_set_tcp_ndelay(sock, 1);
423 i = (*cb)(sock, type, protocol, context);
426 * If we ended with an alert being sent, but still with data in the
427 * network buffer to be read, then calling BIO_closesocket() will
428 * result in a TCP-RST being sent. On some platforms (notably
429 * Windows) then this will result in the peer immediately abandoning
430 * the connection including any buffered alert data before it has
431 * had a chance to be read. Shutting down the sending side first,
432 * and then closing the socket sends TCP-FIN first followed by
433 * TCP-RST. This seems to allow the peer to read the alert data.
435 shutdown(sock, 1); /* SHUT_WR */
437 * We just said we have nothing else to say, but it doesn't mean
438 * that the other side has nothing. It's even recommended to
439 * consume incoming data. [In testing context this ensures that
440 * alerts are passed on...]
443 timeout.tv_usec = 500000; /* some extreme round-trip */
446 openssl_fdset(sock, &readfds);
447 } while (select(sock + 1, &readfds, NULL, NULL, &timeout) > 0
448 && readsocket(sock, sink, sizeof(sink)) > 0);
450 BIO_closesocket(sock);
452 i = (*cb)(asock, type, protocol, context);
457 if (i < 0 || naccept == 0) {
458 BIO_closesocket(asock);
465 if (family == AF_UNIX)
468 BIO_ADDR_free(ourpeer);
473 void do_ssl_shutdown(SSL *ssl)
478 /* We only do unidirectional shutdown */
479 ret = SSL_shutdown(ssl);
481 switch (SSL_get_error(ssl, ret)) {
482 case SSL_ERROR_WANT_READ:
483 case SSL_ERROR_WANT_WRITE:
484 case SSL_ERROR_WANT_ASYNC:
485 case SSL_ERROR_WANT_ASYNC_JOB:
486 /* We just do busy waiting. Nothing clever */
494 #endif /* OPENSSL_NO_SOCK */