]>
git.ipfire.org Git - thirdparty/openssl.git/blob - apps/s_socket.c
2 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
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
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
;
29 #ifndef OPENSSL_NO_SOCK
33 # include "internal/sockets.h"
35 # include <openssl/bio.h>
36 # include <openssl/err.h>
38 /* Keep track of our peer's address for the cookie callback */
39 BIO_ADDR
*ourpeer
= NULL
;
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
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)
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.
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.
60 * Returns 1 on success, 0 on failure.
62 int init_client(int *sock
, const char *host
, const char *port
,
63 const char *bindhost
, const char *bindport
,
64 int family
, int type
, int protocol
)
66 BIO_ADDRINFO
*res
= NULL
;
67 BIO_ADDRINFO
*bindaddr
= NULL
;
68 const BIO_ADDRINFO
*ai
= NULL
;
69 const BIO_ADDRINFO
*bi
= NULL
;
73 if (BIO_sock_init() != 1)
76 ret
= BIO_lookup_ex(host
, port
, BIO_LOOKUP_CLIENT
, family
, type
, protocol
,
79 ERR_print_errors(bio_err
);
83 if (bindhost
!= NULL
|| bindport
!= NULL
) {
84 ret
= BIO_lookup_ex(bindhost
, bindport
, BIO_LOOKUP_CLIENT
,
85 family
, type
, protocol
, &bindaddr
);
87 ERR_print_errors (bio_err
);
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
97 OPENSSL_assert((family
== AF_UNSPEC
98 || family
== BIO_ADDRINFO_family(ai
))
99 && (type
== 0 || type
== BIO_ADDRINFO_socktype(ai
))
101 || protocol
== BIO_ADDRINFO_protocol(ai
)));
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
))
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...
123 if (!BIO_bind(*sock
, BIO_ADDRINFO_address(bi
),
124 BIO_SOCK_REUSEADDR
)) {
125 BIO_closesocket(*sock
);
126 *sock
= INVALID_SOCKET
;
131 #ifndef OPENSSL_NO_SCTP
132 if (protocol
== IPPROTO_SCTP
) {
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
139 BIO
*tmpbio
= BIO_new_dgram_sctp(*sock
, BIO_NOCLOSE
);
141 if (tmpbio
== NULL
) {
142 ERR_print_errors(bio_err
);
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
;
156 /* Success, don't try any more addresses */
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
: "");
172 ERR_print_errors(bio_err
);
174 /* Remove any stale errors from previous connection attempts */
179 if (bindaddr
!= NULL
) {
180 BIO_ADDRINFO_free (bindaddr
);
182 BIO_ADDRINFO_free(res
);
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
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,
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.
204 * 0 on failure, something other on success.
206 int 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
)
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_options
= BIO_SOCK_REUSEADDR
;
220 if (BIO_sock_init() != 1)
223 if (!BIO_lookup_ex(host
, port
, BIO_LOOKUP_SERVER
, family
, type
, protocol
,
225 ERR_print_errors(bio_err
);
229 /* Admittedly, these checks are quite paranoid, we should not get
230 * anything in the BIO_ADDRINFO chain that we haven't asked for */
231 OPENSSL_assert((family
== AF_UNSPEC
|| family
== BIO_ADDRINFO_family(res
))
232 && (type
== 0 || type
== BIO_ADDRINFO_socktype(res
))
233 && (protocol
== 0 || protocol
== BIO_ADDRINFO_protocol(res
)));
235 sock_family
= BIO_ADDRINFO_family(res
);
236 sock_type
= BIO_ADDRINFO_socktype(res
);
237 sock_protocol
= BIO_ADDRINFO_protocol(res
);
238 sock_address
= BIO_ADDRINFO_address(res
);
239 next
= BIO_ADDRINFO_next(res
);
240 if (sock_family
== AF_INET6
)
241 sock_options
|= BIO_SOCK_V6_ONLY
;
243 && BIO_ADDRINFO_socktype(next
) == sock_type
244 && BIO_ADDRINFO_protocol(next
) == sock_protocol
) {
245 if (sock_family
== AF_INET
246 && BIO_ADDRINFO_family(next
) == AF_INET6
) {
247 sock_family
= AF_INET6
;
248 sock_address
= BIO_ADDRINFO_address(next
);
249 } else if (sock_family
== AF_INET6
250 && BIO_ADDRINFO_family(next
) == AF_INET
) {
251 sock_options
&= ~BIO_SOCK_V6_ONLY
;
255 asock
= BIO_socket(sock_family
, sock_type
, sock_protocol
, 0);
256 if (asock
== INVALID_SOCKET
257 || !BIO_listen(asock
, sock_address
, sock_options
)) {
258 BIO_ADDRINFO_free(res
);
259 ERR_print_errors(bio_err
);
260 if (asock
!= INVALID_SOCKET
)
261 BIO_closesocket(asock
);
265 #ifndef OPENSSL_NO_SCTP
266 if (protocol
== IPPROTO_SCTP
) {
268 * For SCTP we have to set various options on the socket prior to
269 * accepting. This is done automatically by BIO_new_dgram_sctp().
270 * We don't actually need the created BIO though so we free it again
273 BIO
*tmpbio
= BIO_new_dgram_sctp(asock
, BIO_NOCLOSE
);
275 if (tmpbio
== NULL
) {
276 BIO_closesocket(asock
);
277 ERR_print_errors(bio_err
);
284 sock_port
= BIO_ADDR_rawport(sock_address
);
286 BIO_ADDRINFO_free(res
);
289 if (sock_port
== 0) {
290 /* dynamically allocated port, report which one */
291 union BIO_sock_info_u info
;
292 char *hostname
= NULL
;
293 char *service
= NULL
;
296 if ((info
.addr
= BIO_ADDR_new()) != NULL
297 && BIO_sock_info(asock
, BIO_SOCK_INFO_ADDRESS
, &info
)
298 && (hostname
= BIO_ADDR_hostname_string(info
.addr
, 1)) != NULL
299 && (service
= BIO_ADDR_service_string(info
.addr
, 1)) != NULL
300 && BIO_printf(bio_s_out
,
301 strchr(hostname
, ':') == NULL
302 ? /* IPv4 */ "ACCEPT %s:%s\n"
303 : /* IPv6 */ "ACCEPT [%s]:%s\n",
304 hostname
, service
) > 0)
307 (void)BIO_flush(bio_s_out
);
308 OPENSSL_free(hostname
);
309 OPENSSL_free(service
);
310 BIO_ADDR_free(info
.addr
);
312 BIO_closesocket(asock
);
313 ERR_print_errors(bio_err
);
317 (void)BIO_printf(bio_s_out
, "ACCEPT\n");
318 (void)BIO_flush(bio_s_out
);
321 if (accept_sock
!= NULL
)
322 *accept_sock
= asock
;
325 struct timeval timeout
;
328 if (type
== SOCK_STREAM
) {
329 BIO_ADDR_free(ourpeer
);
330 ourpeer
= BIO_ADDR_new();
331 if (ourpeer
== NULL
) {
332 BIO_closesocket(asock
);
333 ERR_print_errors(bio_err
);
337 sock
= BIO_accept_ex(asock
, ourpeer
, 0);
338 } while (sock
< 0 && BIO_sock_should_retry(sock
));
340 ERR_print_errors(bio_err
);
341 BIO_closesocket(asock
);
344 BIO_set_tcp_ndelay(sock
, 1);
345 i
= (*cb
)(sock
, type
, protocol
, context
);
348 * If we ended with an alert being sent, but still with data in the
349 * network buffer to be read, then calling BIO_closesocket() will
350 * result in a TCP-RST being sent. On some platforms (notably
351 * Windows) then this will result in the peer immediately abandoning
352 * the connection including any buffered alert data before it has
353 * had a chance to be read. Shutting down the sending side first,
354 * and then closing the socket sends TCP-FIN first followed by
355 * TCP-RST. This seems to allow the peer to read the alert data.
357 shutdown(sock
, 1); /* SHUT_WR */
359 * We just said we have nothing else to say, but it doesn't mean
360 * that the other side has nothing. It's even recommended to
361 * consume incoming data. [In testing context this ensures that
362 * alerts are passed on...]
365 timeout
.tv_usec
= 500000; /* some extreme round-trip */
368 openssl_fdset(sock
, &readfds
);
369 } while (select(sock
+ 1, &readfds
, NULL
, NULL
, &timeout
) > 0
370 && readsocket(sock
, sink
, sizeof(sink
)) > 0);
372 BIO_closesocket(sock
);
374 i
= (*cb
)(asock
, type
, protocol
, context
);
379 if (i
< 0 || naccept
== 0) {
380 BIO_closesocket(asock
);
387 if (family
== AF_UNIX
)
390 BIO_ADDR_free(ourpeer
);
395 #endif /* OPENSSL_NO_SOCK */