1 /* $OpenBSD: bss_sock.c,v 1.23 2014/07/11 08:44:47 jsing 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 static int sock_write(BIO *h, const char *buf, int num); 69 static int sock_read(BIO *h, char *buf, int size); 70 static int sock_puts(BIO *h, const char *str); 71 static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2); 72 static int sock_new(BIO *h); 73 static int sock_free(BIO *data); 74 int BIO_sock_should_retry(int s); 75 76 static BIO_METHOD methods_sockp = { 77 .type = BIO_TYPE_SOCKET, 78 .name = "socket", 79 .bwrite = sock_write, 80 .bread = sock_read, 81 .bputs = sock_puts, 82 .ctrl = sock_ctrl, 83 .create = sock_new, 84 .destroy = sock_free 85 }; 86 87 BIO_METHOD * 88 BIO_s_socket(void) 89 { 90 return (&methods_sockp); 91 } 92 93 BIO * 94 BIO_new_socket(int fd, int close_flag) 95 { 96 BIO *ret; 97 98 ret = BIO_new(BIO_s_socket()); 99 if (ret == NULL) 100 return (NULL); 101 BIO_set_fd(ret, fd, close_flag); 102 return (ret); 103 } 104 105 static int 106 sock_new(BIO *bi) 107 { 108 bi->init = 0; 109 bi->num = 0; 110 bi->ptr = NULL; 111 bi->flags = 0; 112 return (1); 113 } 114 115 static int 116 sock_free(BIO *a) 117 { 118 if (a == NULL) 119 return (0); 120 if (a->shutdown) { 121 if (a->init) { 122 shutdown(a->num, SHUT_RDWR); 123 close(a->num); 124 } 125 a->init = 0; 126 a->flags = 0; 127 } 128 return (1); 129 } 130 131 static int 132 sock_read(BIO *b, char *out, int outl) 133 { 134 int ret = 0; 135 136 if (out != NULL) { 137 errno = 0; 138 ret = read(b->num, out, outl); 139 BIO_clear_retry_flags(b); 140 if (ret <= 0) { 141 if (BIO_sock_should_retry(ret)) 142 BIO_set_retry_read(b); 143 } 144 } 145 return (ret); 146 } 147 148 static int 149 sock_write(BIO *b, const char *in, int inl) 150 { 151 int ret; 152 153 errno = 0; 154 ret = write(b->num, in, inl); 155 BIO_clear_retry_flags(b); 156 if (ret <= 0) { 157 if (BIO_sock_should_retry(ret)) 158 BIO_set_retry_write(b); 159 } 160 return (ret); 161 } 162 163 static long 164 sock_ctrl(BIO *b, int cmd, long num, void *ptr) 165 { 166 long ret = 1; 167 int *ip; 168 169 switch (cmd) { 170 case BIO_C_SET_FD: 171 sock_free(b); 172 b->num= *((int *)ptr); 173 b->shutdown = (int)num; 174 b->init = 1; 175 break; 176 case BIO_C_GET_FD: 177 if (b->init) { 178 ip = (int *)ptr; 179 if (ip != NULL) 180 *ip = b->num; 181 ret = b->num; 182 } else 183 ret = -1; 184 break; 185 case BIO_CTRL_GET_CLOSE: 186 ret = b->shutdown; 187 break; 188 case BIO_CTRL_SET_CLOSE: 189 b->shutdown = (int)num; 190 break; 191 case BIO_CTRL_DUP: 192 case BIO_CTRL_FLUSH: 193 ret = 1; 194 break; 195 default: 196 ret = 0; 197 break; 198 } 199 return (ret); 200 } 201 202 static int 203 sock_puts(BIO *bp, const char *str) 204 { 205 int n, ret; 206 207 n = strlen(str); 208 ret = sock_write(bp, str, n); 209 return (ret); 210 } 211 212 int 213 BIO_sock_should_retry(int i) 214 { 215 int err; 216 217 if ((i == 0) || (i == -1)) { 218 err = errno; 219 return (BIO_sock_non_fatal_error(err)); 220 } 221 return (0); 222 } 223 224 int 225 BIO_sock_non_fatal_error(int err) 226 { 227 switch (err) { 228 case ENOTCONN: 229 case EINTR: 230 case EAGAIN: 231 case EINPROGRESS: 232 case EALREADY: 233 return (1); 234 default: 235 break; 236 } 237 return (0); 238 } 239 240