1 /* $OpenBSD: s_socket.c,v 1.13 2021/12/06 11:06:58 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 #include "s_apps.h"
75
76 static int init_server(int *sock, int port, int type);
77 static int init_server_long(int *sock, int port, char *ip, int type);
78 static int do_accept(int acc_sock, int *sock);
79
80 int
init_client(int * sock,char * host,char * port,int type,int af)81 init_client(int *sock, char *host, char *port, int type, int af)
82 {
83 struct addrinfo hints, *ai_top, *ai;
84 int i, s = -1;
85
86 memset(&hints, '\0', sizeof(hints));
87 hints.ai_family = af;
88 hints.ai_socktype = type;
89
90 if ((i = getaddrinfo(host, port, &hints, &ai_top)) != 0) {
91 BIO_printf(bio_err, "getaddrinfo: %s\n", gai_strerror(i));
92 return (0);
93 }
94 if (ai_top == NULL || ai_top->ai_addr == NULL) {
95 BIO_printf(bio_err, "getaddrinfo returned no addresses\n");
96 if (ai_top != NULL) {
97 freeaddrinfo(ai_top);
98 }
99 return (0);
100 }
101 for (ai = ai_top; ai != NULL; ai = ai->ai_next) {
102 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
103 if (s == -1) {
104 continue;
105 }
106 if (type == SOCK_STREAM) {
107 i = 0;
108 i = setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
109 (char *) &i, sizeof(i));
110 if (i == -1) {
111 perror("keepalive");
112 goto out;
113 }
114 }
115 if ((i = connect(s, ai->ai_addr, ai->ai_addrlen)) == 0) {
116 *sock = s;
117 freeaddrinfo(ai_top);
118 return (1);
119 }
120 close(s);
121 s = -1;
122 }
123
124 perror("connect");
125 out:
126 if (s != -1)
127 close(s);
128 freeaddrinfo(ai_top);
129 return (0);
130 }
131
132 int
do_server(int port,int type,int * ret,int (* cb)(int s,unsigned char * context),unsigned char * context,int naccept)133 do_server(int port, int type, int *ret,
134 int (*cb)(int s, unsigned char *context),
135 unsigned char *context, int naccept)
136 {
137 int sock;
138 int accept_socket = 0;
139 int i;
140
141 if (!init_server(&accept_socket, port, type))
142 return (0);
143
144 if (ret != NULL) {
145 *ret = accept_socket;
146 /* return(1); */
147 }
148 for (;;) {
149 if (type == SOCK_STREAM) {
150 if (do_accept(accept_socket, &sock) == 0) {
151 shutdown(accept_socket, SHUT_RD);
152 close(accept_socket);
153 return (0);
154 }
155 } else
156 sock = accept_socket;
157 i = cb(sock, context);
158 if (type == SOCK_STREAM) {
159 shutdown(sock, SHUT_RDWR);
160 close(sock);
161 }
162 if (naccept != -1)
163 naccept--;
164 if (i < 0 || naccept == 0) {
165 shutdown(accept_socket, SHUT_RDWR);
166 close(accept_socket);
167 return (i);
168 }
169 }
170 }
171
172 static int
init_server_long(int * sock,int port,char * ip,int type)173 init_server_long(int *sock, int port, char *ip, int type)
174 {
175 int ret = 0;
176 struct sockaddr_in server;
177 int s = -1;
178
179 memset((char *) &server, 0, sizeof(server));
180 server.sin_family = AF_INET;
181 server.sin_port = htons((unsigned short) port);
182 if (ip == NULL)
183 server.sin_addr.s_addr = INADDR_ANY;
184 else
185 memcpy(&server.sin_addr.s_addr, ip, 4);
186
187 if (type == SOCK_STREAM)
188 s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
189 else /* type == SOCK_DGRAM */
190 s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
191
192 if (s == -1)
193 goto err;
194 #if defined SOL_SOCKET && defined SO_REUSEADDR
195 {
196 int j = 1;
197 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
198 (void *) &j, sizeof j) == -1) {
199 perror("setsockopt");
200 goto err;
201 }
202 }
203 #endif
204 if (bind(s, (struct sockaddr *) & server, sizeof(server)) == -1) {
205 perror("bind");
206 goto err;
207 }
208 /* Make it 128 for linux */
209 if (type == SOCK_STREAM && listen(s, 128) == -1)
210 goto err;
211 *sock = s;
212 ret = 1;
213 err:
214 if ((ret == 0) && (s != -1)) {
215 shutdown(s, SHUT_RD);
216 close(s);
217 }
218 return (ret);
219 }
220
221 static int
init_server(int * sock,int port,int type)222 init_server(int *sock, int port, int type)
223 {
224 return (init_server_long(sock, port, NULL, type));
225 }
226
227 static int
do_accept(int acc_sock,int * sock)228 do_accept(int acc_sock, int *sock)
229 {
230 struct hostent *h1, *h2;
231 static struct sockaddr_in from;
232 socklen_t len;
233 char *host = NULL;
234 int ret;
235
236 redoit:
237
238 memset((char *) &from, 0, sizeof(from));
239 len = sizeof(from);
240 ret = accept(acc_sock, (struct sockaddr *) & from, &len);
241 if (ret == -1) {
242 if (errno == EINTR) {
243 /* check_timeout(); */
244 goto redoit;
245 }
246 fprintf(stderr, "errno=%d ", errno);
247 perror("accept");
248 return (0);
249 }
250
251 h1 = gethostbyaddr((char *) &from.sin_addr.s_addr,
252 sizeof(from.sin_addr.s_addr), AF_INET);
253 if (h1 == NULL) {
254 BIO_printf(bio_err, "bad gethostbyaddr\n");
255 } else {
256 if ((host = strdup(h1->h_name)) == NULL) {
257 perror("strdup");
258 close(ret);
259 return (0);
260 }
261
262 h2 = gethostbyname(host);
263 if (h2 == NULL) {
264 BIO_printf(bio_err, "gethostbyname failure\n");
265 close(ret);
266 free(host);
267 return (0);
268 }
269 if (h2->h_addrtype != AF_INET) {
270 BIO_printf(bio_err, "gethostbyname addr is not AF_INET\n");
271 close(ret);
272 free(host);
273 return (0);
274 }
275 }
276
277 free(host);
278 *sock = ret;
279 return (1);
280 }
281
282 int
extract_host_port(char * str,char ** host_ptr,unsigned char * ip,char ** port_ptr)283 extract_host_port(char *str, char **host_ptr, unsigned char *ip,
284 char **port_ptr)
285 {
286 char *h, *p;
287
288 h = str;
289 p = strrchr(str, '/'); /* IPv6 host/port */
290 if (p == NULL) {
291 p = strrchr(str, ':');
292 }
293 if (p == NULL) {
294 BIO_printf(bio_err, "no port defined\n");
295 return (0);
296 }
297 *(p++) = '\0';
298
299 if (host_ptr != NULL)
300 *host_ptr = h;
301
302 if (port_ptr != NULL && p != NULL && *p != '\0')
303 *port_ptr = p;
304
305 return (1);
306 }
307
308 int
extract_port(char * str,short * port_ptr)309 extract_port(char *str, short *port_ptr)
310 {
311 int i;
312 const char *errstr;
313 struct servent *s;
314
315 i = strtonum(str, 1, 65535, &errstr);
316 if (!errstr) {
317 *port_ptr = (unsigned short) i;
318 } else {
319 s = getservbyname(str, "tcp");
320 if (s == NULL) {
321 BIO_printf(bio_err, "getservbyname failure for %s\n", str);
322 return (0);
323 }
324 *port_ptr = ntohs((unsigned short) s->s_port);
325 }
326 return (1);
327 }
328