1 | /* |
2 | * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
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 |
8 | */ |
9 | |
10 | #include <stdio.h> |
11 | #include <stdlib.h> |
12 | #include <errno.h> |
13 | |
14 | #include "bio_local.h" |
15 | |
16 | #include <openssl/err.h> |
17 | |
18 | #ifndef OPENSSL_NO_SOCK |
19 | # ifdef SO_MAXCONN |
20 | # define MAX_LISTEN SO_MAXCONN |
21 | # elif defined(SOMAXCONN) |
22 | # define MAX_LISTEN SOMAXCONN |
23 | # else |
24 | # define MAX_LISTEN 32 |
25 | # endif |
26 | |
27 | /*- |
28 | * BIO_socket - create a socket |
29 | * @domain: the socket domain (AF_INET, AF_INET6, AF_UNIX, ...) |
30 | * @socktype: the socket type (SOCK_STEAM, SOCK_DGRAM) |
31 | * @protocol: the protocol to use (IPPROTO_TCP, IPPROTO_UDP) |
32 | * @options: BIO socket options (currently unused) |
33 | * |
34 | * Creates a socket. This should be called before calling any |
35 | * of BIO_connect and BIO_listen. |
36 | * |
37 | * Returns the file descriptor on success or INVALID_SOCKET on failure. On |
38 | * failure errno is set, and a status is added to the OpenSSL error stack. |
39 | */ |
40 | int BIO_socket(int domain, int socktype, int protocol, int options) |
41 | { |
42 | int sock = -1; |
43 | |
44 | if (BIO_sock_init() != 1) |
45 | return INVALID_SOCKET; |
46 | |
47 | sock = socket(domain, socktype, protocol); |
48 | if (sock == -1) { |
49 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
50 | "calling socket()" ); |
51 | BIOerr(BIO_F_BIO_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET); |
52 | return INVALID_SOCKET; |
53 | } |
54 | |
55 | return sock; |
56 | } |
57 | |
58 | /*- |
59 | * BIO_connect - connect to an address |
60 | * @sock: the socket to connect with |
61 | * @addr: the address to connect to |
62 | * @options: BIO socket options |
63 | * |
64 | * Connects to the address using the given socket and options. |
65 | * |
66 | * Options can be a combination of the following: |
67 | * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages. |
68 | * - BIO_SOCK_NONBLOCK: Make the socket non-blocking. |
69 | * - BIO_SOCK_NODELAY: don't delay small messages. |
70 | * |
71 | * options holds BIO socket options that can be used |
72 | * You should call this for every address returned by BIO_lookup |
73 | * until the connection is successful. |
74 | * |
75 | * Returns 1 on success or 0 on failure. On failure errno is set |
76 | * and an error status is added to the OpenSSL error stack. |
77 | */ |
78 | int BIO_connect(int sock, const BIO_ADDR *addr, int options) |
79 | { |
80 | const int on = 1; |
81 | |
82 | if (sock == -1) { |
83 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_INVALID_SOCKET); |
84 | return 0; |
85 | } |
86 | |
87 | if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0)) |
88 | return 0; |
89 | |
90 | if (options & BIO_SOCK_KEEPALIVE) { |
91 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
92 | (const void *)&on, sizeof(on)) != 0) { |
93 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
94 | "calling setsockopt()" ); |
95 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_KEEPALIVE); |
96 | return 0; |
97 | } |
98 | } |
99 | |
100 | if (options & BIO_SOCK_NODELAY) { |
101 | if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, |
102 | (const void *)&on, sizeof(on)) != 0) { |
103 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
104 | "calling setsockopt()" ); |
105 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_UNABLE_TO_NODELAY); |
106 | return 0; |
107 | } |
108 | } |
109 | |
110 | if (connect(sock, BIO_ADDR_sockaddr(addr), |
111 | BIO_ADDR_sockaddr_size(addr)) == -1) { |
112 | if (!BIO_sock_should_retry(-1)) { |
113 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
114 | "calling connect()" ); |
115 | BIOerr(BIO_F_BIO_CONNECT, BIO_R_CONNECT_ERROR); |
116 | } |
117 | return 0; |
118 | } |
119 | return 1; |
120 | } |
121 | |
122 | /*- |
123 | * BIO_bind - bind socket to address |
124 | * @sock: the socket to set |
125 | * @addr: local address to bind to |
126 | * @options: BIO socket options |
127 | * |
128 | * Binds to the address using the given socket and options. |
129 | * |
130 | * Options can be a combination of the following: |
131 | * - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination |
132 | * for a recently closed port. |
133 | * |
134 | * When restarting the program it could be that the port is still in use. If |
135 | * you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway. |
136 | * It's recommended that you use this. |
137 | */ |
138 | int BIO_bind(int sock, const BIO_ADDR *addr, int options) |
139 | { |
140 | # ifndef OPENSSL_SYS_WINDOWS |
141 | int on = 1; |
142 | # endif |
143 | |
144 | if (sock == -1) { |
145 | BIOerr(BIO_F_BIO_BIND, BIO_R_INVALID_SOCKET); |
146 | return 0; |
147 | } |
148 | |
149 | # ifndef OPENSSL_SYS_WINDOWS |
150 | /* |
151 | * SO_REUSEADDR has different behavior on Windows than on |
152 | * other operating systems, don't set it there. |
153 | */ |
154 | if (options & BIO_SOCK_REUSEADDR) { |
155 | if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, |
156 | (const void *)&on, sizeof(on)) != 0) { |
157 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
158 | "calling setsockopt()" ); |
159 | BIOerr(BIO_F_BIO_BIND, BIO_R_UNABLE_TO_REUSEADDR); |
160 | return 0; |
161 | } |
162 | } |
163 | # endif |
164 | |
165 | if (bind(sock, BIO_ADDR_sockaddr(addr), BIO_ADDR_sockaddr_size(addr)) != 0) { |
166 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
167 | "calling bind()" ); |
168 | BIOerr(BIO_F_BIO_BIND, BIO_R_UNABLE_TO_BIND_SOCKET); |
169 | return 0; |
170 | } |
171 | |
172 | return 1; |
173 | } |
174 | |
175 | /*- |
176 | * BIO_listen - Creates a listen socket |
177 | * @sock: the socket to listen with |
178 | * @addr: local address to bind to |
179 | * @options: BIO socket options |
180 | * |
181 | * Binds to the address using the given socket and options, then |
182 | * starts listening for incoming connections. |
183 | * |
184 | * Options can be a combination of the following: |
185 | * - BIO_SOCK_KEEPALIVE: enable regularly sending keep-alive messages. |
186 | * - BIO_SOCK_NONBLOCK: Make the socket non-blocking. |
187 | * - BIO_SOCK_NODELAY: don't delay small messages. |
188 | * - BIO_SOCK_REUSEADDR: Try to reuse the address and port combination |
189 | * for a recently closed port. |
190 | * - BIO_SOCK_V6_ONLY: When creating an IPv6 socket, make it listen only |
191 | * for IPv6 addresses and not IPv4 addresses mapped to IPv6. |
192 | * |
193 | * It's recommended that you set up both an IPv6 and IPv4 listen socket, and |
194 | * then check both for new clients that connect to it. You want to set up |
195 | * the socket as non-blocking in that case since else it could hang. |
196 | * |
197 | * Not all operating systems support IPv4 addresses on an IPv6 socket, and for |
198 | * others it's an option. If you pass the BIO_LISTEN_V6_ONLY it will try to |
199 | * create the IPv6 sockets to only listen for IPv6 connection. |
200 | * |
201 | * It could be that the first BIO_listen() call will listen to all the IPv6 |
202 | * and IPv4 addresses and that then trying to bind to the IPv4 address will |
203 | * fail. We can't tell the difference between already listening ourself to |
204 | * it and someone else listening to it when failing and errno is EADDRINUSE, so |
205 | * it's recommended to not give an error in that case if the first call was |
206 | * successful. |
207 | * |
208 | * When restarting the program it could be that the port is still in use. If |
209 | * you set to BIO_SOCK_REUSEADDR option it will try to reuse the port anyway. |
210 | * It's recommended that you use this. |
211 | */ |
212 | int BIO_listen(int sock, const BIO_ADDR *addr, int options) |
213 | { |
214 | int on = 1; |
215 | int socktype; |
216 | socklen_t socktype_len = sizeof(socktype); |
217 | |
218 | if (sock == -1) { |
219 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_INVALID_SOCKET); |
220 | return 0; |
221 | } |
222 | |
223 | if (getsockopt(sock, SOL_SOCKET, SO_TYPE, |
224 | (void *)&socktype, &socktype_len) != 0 |
225 | || socktype_len != sizeof(socktype)) { |
226 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
227 | "calling getsockopt()" ); |
228 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_GETTING_SOCKTYPE); |
229 | return 0; |
230 | } |
231 | |
232 | if (!BIO_socket_nbio(sock, (options & BIO_SOCK_NONBLOCK) != 0)) |
233 | return 0; |
234 | |
235 | if (options & BIO_SOCK_KEEPALIVE) { |
236 | if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
237 | (const void *)&on, sizeof(on)) != 0) { |
238 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
239 | "calling setsockopt()" ); |
240 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_KEEPALIVE); |
241 | return 0; |
242 | } |
243 | } |
244 | |
245 | if (options & BIO_SOCK_NODELAY) { |
246 | if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, |
247 | (const void *)&on, sizeof(on)) != 0) { |
248 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
249 | "calling setsockopt()" ); |
250 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_NODELAY); |
251 | return 0; |
252 | } |
253 | } |
254 | |
255 | # ifdef IPV6_V6ONLY |
256 | if (BIO_ADDR_family(addr) == AF_INET6) { |
257 | /* |
258 | * Note: Windows default of IPV6_V6ONLY is ON, and Linux is OFF. |
259 | * Therefore we always have to use setsockopt here. |
260 | */ |
261 | on = options & BIO_SOCK_V6_ONLY ? 1 : 0; |
262 | if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, |
263 | (const void *)&on, sizeof(on)) != 0) { |
264 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
265 | "calling setsockopt()" ); |
266 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_LISTEN_V6_ONLY); |
267 | return 0; |
268 | } |
269 | } |
270 | # endif |
271 | |
272 | if (!BIO_bind(sock, addr, options)) |
273 | return 0; |
274 | |
275 | if (socktype != SOCK_DGRAM && listen(sock, MAX_LISTEN) == -1) { |
276 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
277 | "calling listen()" ); |
278 | BIOerr(BIO_F_BIO_LISTEN, BIO_R_UNABLE_TO_LISTEN_SOCKET); |
279 | return 0; |
280 | } |
281 | |
282 | return 1; |
283 | } |
284 | |
285 | /*- |
286 | * BIO_accept_ex - Accept new incoming connections |
287 | * @sock: the listening socket |
288 | * @addr: the BIO_ADDR to store the peer address in |
289 | * @options: BIO socket options, applied on the accepted socket. |
290 | * |
291 | */ |
292 | int BIO_accept_ex(int accept_sock, BIO_ADDR *addr_, int options) |
293 | { |
294 | socklen_t len; |
295 | int accepted_sock; |
296 | BIO_ADDR locaddr; |
297 | BIO_ADDR *addr = addr_ == NULL ? &locaddr : addr_; |
298 | |
299 | len = sizeof(*addr); |
300 | accepted_sock = accept(accept_sock, |
301 | BIO_ADDR_sockaddr_noconst(addr), &len); |
302 | if (accepted_sock == -1) { |
303 | if (!BIO_sock_should_retry(accepted_sock)) { |
304 | ERR_raise_data(ERR_LIB_SYS, get_last_socket_error(), |
305 | "calling accept()" ); |
306 | BIOerr(BIO_F_BIO_ACCEPT_EX, BIO_R_ACCEPT_ERROR); |
307 | } |
308 | return INVALID_SOCKET; |
309 | } |
310 | |
311 | if (!BIO_socket_nbio(accepted_sock, (options & BIO_SOCK_NONBLOCK) != 0)) { |
312 | closesocket(accepted_sock); |
313 | return INVALID_SOCKET; |
314 | } |
315 | |
316 | return accepted_sock; |
317 | } |
318 | |
319 | /*- |
320 | * BIO_closesocket - Close a socket |
321 | * @sock: the socket to close |
322 | */ |
323 | int BIO_closesocket(int sock) |
324 | { |
325 | if (closesocket(sock) < 0) |
326 | return 0; |
327 | return 1; |
328 | } |
329 | #endif |
330 | |