1 /* $OpenBSD: bss_sock.c,v 1.25 2022/01/07 09:02:17 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 95 BIO * 96 BIO_new_socket(int fd, int close_flag) 97 { 98 BIO *ret; 99 100 ret = BIO_new(BIO_s_socket()); 101 if (ret == NULL) 102 return (NULL); 103 BIO_set_fd(ret, fd, close_flag); 104 return (ret); 105 } 106 107 static int 108 sock_new(BIO *bi) 109 { 110 bi->init = 0; 111 bi->num = 0; 112 bi->ptr = NULL; 113 bi->flags = 0; 114 return (1); 115 } 116 117 static int 118 sock_free(BIO *a) 119 { 120 if (a == NULL) 121 return (0); 122 if (a->shutdown) { 123 if (a->init) { 124 shutdown(a->num, SHUT_RDWR); 125 close(a->num); 126 } 127 a->init = 0; 128 a->flags = 0; 129 } 130 return (1); 131 } 132 133 static int 134 sock_read(BIO *b, char *out, int outl) 135 { 136 int ret = 0; 137 138 if (out != NULL) { 139 errno = 0; 140 ret = read(b->num, out, outl); 141 BIO_clear_retry_flags(b); 142 if (ret <= 0) { 143 if (BIO_sock_should_retry(ret)) 144 BIO_set_retry_read(b); 145 } 146 } 147 return (ret); 148 } 149 150 static int 151 sock_write(BIO *b, const char *in, int inl) 152 { 153 int ret; 154 155 errno = 0; 156 ret = write(b->num, in, inl); 157 BIO_clear_retry_flags(b); 158 if (ret <= 0) { 159 if (BIO_sock_should_retry(ret)) 160 BIO_set_retry_write(b); 161 } 162 return (ret); 163 } 164 165 static long 166 sock_ctrl(BIO *b, int cmd, long num, void *ptr) 167 { 168 long ret = 1; 169 int *ip; 170 171 switch (cmd) { 172 case BIO_C_SET_FD: 173 sock_free(b); 174 b->num= *((int *)ptr); 175 b->shutdown = (int)num; 176 b->init = 1; 177 break; 178 case BIO_C_GET_FD: 179 if (b->init) { 180 ip = (int *)ptr; 181 if (ip != NULL) 182 *ip = b->num; 183 ret = b->num; 184 } else 185 ret = -1; 186 break; 187 case BIO_CTRL_GET_CLOSE: 188 ret = b->shutdown; 189 break; 190 case BIO_CTRL_SET_CLOSE: 191 b->shutdown = (int)num; 192 break; 193 case BIO_CTRL_DUP: 194 case BIO_CTRL_FLUSH: 195 ret = 1; 196 break; 197 default: 198 ret = 0; 199 break; 200 } 201 return (ret); 202 } 203 204 static int 205 sock_puts(BIO *bp, const char *str) 206 { 207 int n, ret; 208 209 n = strlen(str); 210 ret = sock_write(bp, str, n); 211 return (ret); 212 } 213 214 int 215 BIO_sock_should_retry(int i) 216 { 217 int err; 218 219 if ((i == 0) || (i == -1)) { 220 err = errno; 221 return (BIO_sock_non_fatal_error(err)); 222 } 223 return (0); 224 } 225 226 int 227 BIO_sock_non_fatal_error(int err) 228 { 229 switch (err) { 230 case ENOTCONN: 231 case EINTR: 232 case EAGAIN: 233 case EINPROGRESS: 234 case EALREADY: 235 return (1); 236 default: 237 break; 238 } 239 return (0); 240 } 241 242