1 /* $OpenBSD: s_socket.c,v 1.14 2025/01/02 13:10:03 tb Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <sys/socket.h>
60
61 #include <netinet/in.h>
62
63 #include <errno.h>
64 #include <netdb.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <unistd.h>
69
70 #include "apps.h"
71
72 #include <openssl/ssl.h>
73
74 static int init_server(int *sock, int port, int type);
75 static int init_server_long(int *sock, int port, char *ip, int type);
76 static int do_accept(int acc_sock, int *sock);
77
78 int
init_client(int * sock,char * host,char * port,int type,int af)79 init_client(int *sock, char *host, char *port, int type, int af)
80 {
81 struct addrinfo hints, *ai_top, *ai;
82 int i, s = -1;
83
84 memset(&hints, '\0', sizeof(hints));
85 hints.ai_family = af;
86 hints.ai_socktype = type;
87
88 if ((i = getaddrinfo(host, port, &hints, &ai_top)) != 0) {
89 BIO_printf(bio_err, "getaddrinfo: %s\n", gai_strerror(i));
90 return (0);
91 }
92 if (ai_top == NULL || ai_top->ai_addr == NULL) {
93 BIO_printf(bio_err, "getaddrinfo returned no addresses\n");
94 if (ai_top != NULL) {
95 freeaddrinfo(ai_top);
96 }
97 return (0);
98 }
99 for (ai = ai_top; ai != NULL; ai = ai->ai_next) {
100 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
101 if (s == -1) {
102 continue;
103 }
104 if (type == SOCK_STREAM) {
105 i = 0;
106 i = setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
107 (char *) &i, sizeof(i));
108 if (i == -1) {
109 perror("keepalive");
110 goto out;
111 }
112 }
113 if ((i = connect(s, ai->ai_addr, ai->ai_addrlen)) == 0) {
114 *sock = s;
115 freeaddrinfo(ai_top);
116 return (1);
117 }
118 close(s);
119 s = -1;
120 }
121
122 perror("connect");
123 out:
124 if (s != -1)
125 close(s);
126 freeaddrinfo(ai_top);
127 return (0);
128 }
129
130 int
do_server(int port,int type,int * ret,int (* cb)(int s,unsigned char * context),unsigned char * context,int naccept)131 do_server(int port, int type, int *ret,
132 int (*cb)(int s, unsigned char *context),
133 unsigned char *context, int naccept)
134 {
135 int sock;
136 int accept_socket = 0;
137 int i;
138
139 if (!init_server(&accept_socket, port, type))
140 return (0);
141
142 if (ret != NULL) {
143 *ret = accept_socket;
144 /* return(1); */
145 }
146 for (;;) {
147 if (type == SOCK_STREAM) {
148 if (do_accept(accept_socket, &sock) == 0) {
149 shutdown(accept_socket, SHUT_RD);
150 close(accept_socket);
151 return (0);
152 }
153 } else
154 sock = accept_socket;
155 i = cb(sock, context);
156 if (type == SOCK_STREAM) {
157 shutdown(sock, SHUT_RDWR);
158 close(sock);
159 }
160 if (naccept != -1)
161 naccept--;
162 if (i < 0 || naccept == 0) {
163 shutdown(accept_socket, SHUT_RDWR);
164 close(accept_socket);
165 return (i);
166 }
167 }
168 }
169
170 static int
init_server_long(int * sock,int port,char * ip,int type)171 init_server_long(int *sock, int port, char *ip, int type)
172 {
173 int ret = 0;
174 struct sockaddr_in server;
175 int s = -1;
176
177 memset((char *) &server, 0, sizeof(server));
178 server.sin_family = AF_INET;
179 server.sin_port = htons((unsigned short) port);
180 if (ip == NULL)
181 server.sin_addr.s_addr = INADDR_ANY;
182 else
183 memcpy(&server.sin_addr.s_addr, ip, 4);
184
185 if (type == SOCK_STREAM)
186 s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
187 else /* type == SOCK_DGRAM */
188 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
189
190 if (s == -1)
191 goto err;
192 #if defined SOL_SOCKET && defined SO_REUSEADDR
193 {
194 int j = 1;
195 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
196 (void *) &j, sizeof j) == -1) {
197 perror("setsockopt");
198 goto err;
199 }
200 }
201 #endif
202 if (bind(s, (struct sockaddr *) & server, sizeof(server)) == -1) {
203 perror("bind");
204 goto err;
205 }
206 /* Make it 128 for linux */
207 if (type == SOCK_STREAM && listen(s, 128) == -1)
208 goto err;
209 *sock = s;
210 ret = 1;
211 err:
212 if ((ret == 0) && (s != -1)) {
213 shutdown(s, SHUT_RD);
214 close(s);
215 }
216 return (ret);
217 }
218
219 static int
init_server(int * sock,int port,int type)220 init_server(int *sock, int port, int type)
221 {
222 return (init_server_long(sock, port, NULL, type));
223 }
224
225 static int
do_accept(int acc_sock,int * sock)226 do_accept(int acc_sock, int *sock)
227 {
228 struct hostent *h1, *h2;
229 static struct sockaddr_in from;
230 socklen_t len;
231 char *host = NULL;
232 int ret;
233
234 redoit:
235
236 memset((char *) &from, 0, sizeof(from));
237 len = sizeof(from);
238 ret = accept(acc_sock, (struct sockaddr *) & from, &len);
239 if (ret == -1) {
240 if (errno == EINTR) {
241 /* check_timeout(); */
242 goto redoit;
243 }
244 fprintf(stderr, "errno=%d ", errno);
245 perror("accept");
246 return (0);
247 }
248
249 h1 = gethostbyaddr((char *) &from.sin_addr.s_addr,
250 sizeof(from.sin_addr.s_addr), AF_INET);
251 if (h1 == NULL) {
252 BIO_printf(bio_err, "bad gethostbyaddr\n");
253 } else {
254 if ((host = strdup(h1->h_name)) == NULL) {
255 perror("strdup");
256 close(ret);
257 return (0);
258 }
259
260 h2 = gethostbyname(host);
261 if (h2 == NULL) {
262 BIO_printf(bio_err, "gethostbyname failure\n");
263 close(ret);
264 free(host);
265 return (0);
266 }
267 if (h2->h_addrtype != AF_INET) {
268 BIO_printf(bio_err, "gethostbyname addr is not AF_INET\n");
269 close(ret);
270 free(host);
271 return (0);
272 }
273 }
274
275 free(host);
276 *sock = ret;
277 return (1);
278 }
279
280 int
extract_host_port(char * str,char ** host_ptr,unsigned char * ip,char ** port_ptr)281 extract_host_port(char *str, char **host_ptr, unsigned char *ip,
282 char **port_ptr)
283 {
284 char *h, *p;
285
286 h = str;
287 p = strrchr(str, '/'); /* IPv6 host/port */
288 if (p == NULL) {
289 p = strrchr(str, ':');
290 }
291 if (p == NULL) {
292 BIO_printf(bio_err, "no port defined\n");
293 return (0);
294 }
295 *(p++) = '\0';
296
297 if (host_ptr != NULL)
298 *host_ptr = h;
299
300 if (port_ptr != NULL && p != NULL && *p != '\0')
301 *port_ptr = p;
302
303 return (1);
304 }
305
306 int
extract_port(char * str,short * port_ptr)307 extract_port(char *str, short *port_ptr)
308 {
309 int i;
310 const char *errstr;
311 struct servent *s;
312
313 i = strtonum(str, 1, 65535, &errstr);
314 if (!errstr) {
315 *port_ptr = (unsigned short) i;
316 } else {
317 s = getservbyname(str, "tcp");
318 if (s == NULL) {
319 BIO_printf(bio_err, "getservbyname failure for %s\n", str);
320 return (0);
321 }
322 *port_ptr = ntohs((unsigned short) s->s_port);
323 }
324 return (1);
325 }
326