1 /* $OpenBSD: bss_sock.c,v 1.27 2023/08/07 10:54:14 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 <errno.h> 62 #include <stdio.h> 63 #include <string.h> 64 #include <unistd.h> 65 66 #include <openssl/bio.h> 67 68 #include "bio_local.h" 69 70 static int sock_write(BIO *h, const char *buf, int num); 71 static int sock_read(BIO *h, char *buf, int size); 72 static int sock_puts(BIO *h, const char *str); 73 static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2); 74 static int sock_new(BIO *h); 75 static int sock_free(BIO *data); 76 int BIO_sock_should_retry(int s); 77 78 static const BIO_METHOD methods_sockp = { 79 .type = BIO_TYPE_SOCKET, 80 .name = "socket", 81 .bwrite = sock_write, 82 .bread = sock_read, 83 .bputs = sock_puts, 84 .ctrl = sock_ctrl, 85 .create = sock_new, 86 .destroy = sock_free 87 }; 88 89 const BIO_METHOD * 90 BIO_s_socket(void) 91 { 92 return (&methods_sockp); 93 } 94 LCRYPTO_ALIAS(BIO_s_socket); 95 96 BIO * 97 BIO_new_socket(int fd, int close_flag) 98 { 99 BIO *ret; 100 101 ret = BIO_new(BIO_s_socket()); 102 if (ret == NULL) 103 return (NULL); 104 BIO_set_fd(ret, fd, close_flag); 105 return (ret); 106 } 107 LCRYPTO_ALIAS(BIO_new_socket); 108 109 static int 110 sock_new(BIO *bi) 111 { 112 bi->init = 0; 113 bi->num = 0; 114 bi->ptr = NULL; 115 bi->flags = 0; 116 return (1); 117 } 118 119 static int 120 sock_free(BIO *a) 121 { 122 if (a == NULL) 123 return (0); 124 if (a->shutdown) { 125 if (a->init) { 126 shutdown(a->num, SHUT_RDWR); 127 close(a->num); 128 } 129 a->init = 0; 130 a->flags = 0; 131 } 132 return (1); 133 } 134 135 static int 136 sock_read(BIO *b, char *out, int outl) 137 { 138 int ret = 0; 139 140 if (out != NULL) { 141 errno = 0; 142 ret = read(b->num, out, outl); 143 BIO_clear_retry_flags(b); 144 if (ret <= 0) { 145 if (BIO_sock_should_retry(ret)) 146 BIO_set_retry_read(b); 147 } 148 } 149 return (ret); 150 } 151 152 static int 153 sock_write(BIO *b, const char *in, int inl) 154 { 155 int ret; 156 157 errno = 0; 158 ret = write(b->num, in, inl); 159 BIO_clear_retry_flags(b); 160 if (ret <= 0) { 161 if (BIO_sock_should_retry(ret)) 162 BIO_set_retry_write(b); 163 } 164 return (ret); 165 } 166 167 static long 168 sock_ctrl(BIO *b, int cmd, long num, void *ptr) 169 { 170 long ret = 1; 171 int *ip; 172 173 switch (cmd) { 174 case BIO_C_SET_FD: 175 sock_free(b); 176 b->num = *((int *)ptr); 177 b->shutdown = (int)num; 178 b->init = 1; 179 break; 180 case BIO_C_GET_FD: 181 if (b->init) { 182 ip = (int *)ptr; 183 if (ip != NULL) 184 *ip = b->num; 185 ret = b->num; 186 } else 187 ret = -1; 188 break; 189 case BIO_CTRL_GET_CLOSE: 190 ret = b->shutdown; 191 break; 192 case BIO_CTRL_SET_CLOSE: 193 b->shutdown = (int)num; 194 break; 195 case BIO_CTRL_DUP: 196 case BIO_CTRL_FLUSH: 197 ret = 1; 198 break; 199 default: 200 ret = 0; 201 break; 202 } 203 return (ret); 204 } 205 206 static int 207 sock_puts(BIO *bp, const char *str) 208 { 209 int n, ret; 210 211 n = strlen(str); 212 ret = sock_write(bp, str, n); 213 return (ret); 214 } 215 216 int 217 BIO_sock_should_retry(int i) 218 { 219 int err; 220 221 if ((i == 0) || (i == -1)) { 222 err = errno; 223 return (BIO_sock_non_fatal_error(err)); 224 } 225 return (0); 226 } 227 LCRYPTO_ALIAS(BIO_sock_should_retry); 228 229 int 230 BIO_sock_non_fatal_error(int err) 231 { 232 switch (err) { 233 case ENOTCONN: 234 case EINTR: 235 case EAGAIN: 236 case EINPROGRESS: 237 case EALREADY: 238 return (1); 239 default: 240 break; 241 } 242 return (0); 243 } 244 LCRYPTO_ALIAS(BIO_sock_non_fatal_error); 245