2 * Copyright 1995-2017 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>
39 * init_client - helper routine to set up socket communication
40 * @sock: pointer to storage of resulting socket.
41 * @host: the host name or path (for AF_UNIX) to connect to.
42 * @port: the port to connect to (ignored for AF_UNIX).
43 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
45 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
46 * @protocol: socket protocol, e.g. IPPROTO_TCP or IPPROTO_UDP (or 0 for any)
48 * This will create a socket and use it to connect to a host:port, or if
49 * family == AF_UNIX, to the path found in host.
51 * If the host has more than one address, it will try them one by one until
52 * a successful connection is established. The resulting socket will be
53 * found in *sock on success, it will be given INVALID_SOCKET otherwise.
55 * Returns 1 on success, 0 on failure.
57 int init_client(int *sock, const char *host, const char *port,
58 int family, int type, int protocol)
60 BIO_ADDRINFO *res = NULL;
61 const BIO_ADDRINFO *ai = NULL;
64 if (BIO_sock_init() != 1)
67 ret = BIO_lookup_ex(host, port, BIO_LOOKUP_CLIENT, family, type, protocol,
70 ERR_print_errors(bio_err);
75 for (ai = res; ai != NULL; ai = BIO_ADDRINFO_next(ai)) {
76 /* Admittedly, these checks are quite paranoid, we should not get
77 * anything in the BIO_ADDRINFO chain that we haven't
79 OPENSSL_assert((family == AF_UNSPEC
80 || family == BIO_ADDRINFO_family(ai))
81 && (type == 0 || type == BIO_ADDRINFO_socktype(ai))
83 || protocol == BIO_ADDRINFO_protocol(ai)));
85 *sock = BIO_socket(BIO_ADDRINFO_family(ai), BIO_ADDRINFO_socktype(ai),
86 BIO_ADDRINFO_protocol(ai), 0);
87 if (*sock == INVALID_SOCKET) {
88 /* Maybe the kernel doesn't support the socket family, even if
89 * BIO_lookup() added it in the returned result...
94 #ifndef OPENSSL_NO_SCTP
95 if (protocol == IPPROTO_SCTP) {
97 * For SCTP we have to set various options on the socket prior to
98 * connecting. This is done automatically by BIO_new_dgram_sctp().
99 * We don't actually need the created BIO though so we free it again
102 BIO *tmpbio = BIO_new_dgram_sctp(*sock, BIO_NOCLOSE);
104 if (tmpbio == NULL) {
105 ERR_print_errors(bio_err);
112 if (!BIO_connect(*sock, BIO_ADDRINFO_address(ai), 0)) {
113 BIO_closesocket(*sock);
114 *sock = INVALID_SOCKET;
118 /* Success, don't try any more addresses */
122 if (*sock == INVALID_SOCKET) {
123 ERR_print_errors(bio_err);
125 /* Remove any stale errors from previous connection attempts */
129 BIO_ADDRINFO_free(res);
134 * do_server - helper routine to perform a server operation
135 * @accept_sock: pointer to storage of resulting socket.
136 * @host: the host name or path (for AF_UNIX) to connect to.
137 * @port: the port to connect to (ignored for AF_UNIX).
138 * @family: desired socket family, may be AF_INET, AF_INET6, AF_UNIX or
140 * @type: socket type, must be SOCK_STREAM or SOCK_DGRAM
141 * @cb: pointer to a function that receives the accepted socket and
142 * should perform the communication with the connecting client.
143 * @context: pointer to memory that's passed verbatim to the cb function.
144 * @naccept: number of times an incoming connect should be accepted. If -1,
147 * This will create a socket and use it to listen to a host:port, or if
148 * family == AF_UNIX, to the path found in host, then start accepting
149 * incoming connections and run cb on the resulting socket.
151 * 0 on failure, something other on success.
153 int do_server(int *accept_sock, const char *host, const char *port,
154 int family, int type, int protocol, do_server_cb cb,
155 unsigned char *context, int naccept)
160 BIO_ADDRINFO *res = NULL;
163 if (BIO_sock_init() != 1)
166 if (!BIO_lookup_ex(host, port, BIO_LOOKUP_SERVER, family, type, protocol,
168 ERR_print_errors(bio_err);
172 /* Admittedly, these checks are quite paranoid, we should not get
173 * anything in the BIO_ADDRINFO chain that we haven't asked for */
174 OPENSSL_assert((family == AF_UNSPEC || family == BIO_ADDRINFO_family(res))
175 && (type == 0 || type == BIO_ADDRINFO_socktype(res))
176 && (protocol == 0 || protocol == BIO_ADDRINFO_protocol(res)));
178 asock = BIO_socket(BIO_ADDRINFO_family(res), BIO_ADDRINFO_socktype(res),
179 BIO_ADDRINFO_protocol(res), 0);
180 if (asock == INVALID_SOCKET
181 || !BIO_listen(asock, BIO_ADDRINFO_address(res), BIO_SOCK_REUSEADDR)) {
182 BIO_ADDRINFO_free(res);
183 ERR_print_errors(bio_err);
184 if (asock != INVALID_SOCKET)
185 BIO_closesocket(asock);
189 #ifndef OPENSSL_NO_SCTP
190 if (protocol == IPPROTO_SCTP) {
192 * For SCTP we have to set various options on the socket prior to
193 * accepting. This is done automatically by BIO_new_dgram_sctp().
194 * We don't actually need the created BIO though so we free it again
197 BIO *tmpbio = BIO_new_dgram_sctp(asock, BIO_NOCLOSE);
199 if (tmpbio == NULL) {
200 BIO_closesocket(asock);
201 ERR_print_errors(bio_err);
208 BIO_ADDRINFO_free(res);
211 if (accept_sock != NULL)
212 *accept_sock = asock;
214 if (type == SOCK_STREAM) {
216 sock = BIO_accept_ex(asock, NULL, 0);
217 } while (sock < 0 && BIO_sock_should_retry(sock));
219 ERR_print_errors(bio_err);
220 BIO_closesocket(asock);
223 i = (*cb)(sock, type, protocol, context);
225 * If we ended with an alert being sent, but still with data in the
226 * network buffer to be read, then calling BIO_closesocket() will
227 * result in a TCP-RST being sent. On some platforms (notably
228 * Windows) then this will result in the peer immediately abandoning
229 * the connection including any buffered alert data before it has
230 * had a chance to be read. Shutting down the sending side first,
231 * and then closing the socket sends TCP-FIN first followed by
232 * TCP-RST. This seems to allow the peer to read the alert data.
236 shutdown(sock, SD_SEND);
238 #elif defined(SHUT_WR)
239 shutdown(sock, SHUT_WR);
241 BIO_closesocket(sock);
243 i = (*cb)(asock, type, protocol, context);
248 if (i < 0 || naccept == 0) {
249 BIO_closesocket(asock);
256 if (family == AF_UNIX)
262 #endif /* OPENSSL_NO_SOCK */