1 /* crypto/bio/bss_sock.c */ 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 <stdio.h> 60 #include <errno.h> 61 #include <unistd.h> 62 #include "cryptlib.h" 63 #include <sys/socket.h> 64 65 #ifndef OPENSSL_NO_SOCK 66 67 #include <openssl/bio.h> 68 69 static int sock_write(BIO *h, const char *buf, int num); 70 static int sock_read(BIO *h, char *buf, int size); 71 static int sock_puts(BIO *h, const char *str); 72 static long sock_ctrl(BIO *h, int cmd, long arg1, void *arg2); 73 static int sock_new(BIO *h); 74 static int sock_free(BIO *data); 75 int BIO_sock_should_retry(int s); 76 77 static BIO_METHOD methods_sockp = { 78 BIO_TYPE_SOCKET, 79 "socket", 80 sock_write, 81 sock_read, 82 sock_puts, 83 NULL, /* sock_gets, */ 84 sock_ctrl, 85 sock_new, 86 sock_free, 87 NULL, 88 }; 89 90 BIO_METHOD * 91 BIO_s_socket(void) 92 { 93 return (&methods_sockp); 94 } 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 } 107 108 static int 109 sock_new(BIO *bi) 110 { 111 bi->init = 0; 112 bi->num = 0; 113 bi->ptr = NULL; 114 bi->flags = 0; 115 return (1); 116 } 117 118 static int 119 sock_free(BIO *a) 120 { 121 if (a == NULL) 122 return (0); 123 if (a->shutdown) { 124 if (a->init) { 125 shutdown(a->num, SHUT_RDWR); 126 close(a->num); 127 } 128 a->init = 0; 129 a->flags = 0; 130 } 131 return (1); 132 } 133 134 static int 135 sock_read(BIO *b, char *out, int outl) 136 { 137 int ret = 0; 138 139 if (out != NULL) { 140 errno = 0; 141 ret = read(b->num, out, outl); 142 BIO_clear_retry_flags(b); 143 if (ret <= 0) { 144 if (BIO_sock_should_retry(ret)) 145 BIO_set_retry_read(b); 146 } 147 } 148 return (ret); 149 } 150 151 static int 152 sock_write(BIO *b, const char *in, int inl) 153 { 154 int ret; 155 156 errno = 0; 157 ret = write(b->num, in, inl); 158 BIO_clear_retry_flags(b); 159 if (ret <= 0) { 160 if (BIO_sock_should_retry(ret)) 161 BIO_set_retry_write(b); 162 } 163 return (ret); 164 } 165 166 static long 167 sock_ctrl(BIO *b, int cmd, long num, void *ptr) 168 { 169 long ret = 1; 170 int *ip; 171 172 switch (cmd) { 173 case BIO_C_SET_FD: 174 sock_free(b); 175 b->num= *((int *)ptr); 176 b->shutdown = (int)num; 177 b->init = 1; 178 break; 179 case BIO_C_GET_FD: 180 if (b->init) { 181 ip = (int *)ptr; 182 if (ip != NULL) 183 *ip = b->num; 184 ret = b->num; 185 } else 186 ret = -1; 187 break; 188 case BIO_CTRL_GET_CLOSE: 189 ret = b->shutdown; 190 break; 191 case BIO_CTRL_SET_CLOSE: 192 b->shutdown = (int)num; 193 break; 194 case BIO_CTRL_DUP: 195 case BIO_CTRL_FLUSH: 196 ret = 1; 197 break; 198 default: 199 ret = 0; 200 break; 201 } 202 return (ret); 203 } 204 205 static int 206 sock_puts(BIO *bp, const char *str) 207 { 208 int n, ret; 209 210 n = strlen(str); 211 ret = sock_write(bp, str, n); 212 return (ret); 213 } 214 215 int 216 BIO_sock_should_retry(int i) 217 { 218 int err; 219 220 if ((i == 0) || (i == -1)) { 221 err = errno; 222 return (BIO_sock_non_fatal_error(err)); 223 } 224 return (0); 225 } 226 227 int 228 BIO_sock_non_fatal_error(int err) 229 { 230 switch (err) { 231 case ENOTCONN: 232 case EINTR: 233 case EAGAIN: 234 case EINPROGRESS: 235 case EALREADY: 236 return (1); 237 default: 238 break; 239 } 240 return (0); 241 } 242 243 #endif /* #ifndef OPENSSL_NO_SOCK */ 244