bss_fd.c revision 280297
155714Skris/* crypto/bio/bss_fd.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280297Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280297Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280297Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280297Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280297Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280297Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 59109998Smarkm#include <stdio.h> 60109998Smarkm#include <errno.h> 61109998Smarkm#define USE_SOCKETS 62109998Smarkm#include "cryptlib.h" 63238405Sjkim 64238405Sjkim#if defined(OPENSSL_NO_POSIX_IO) 65160814Ssimon/* 66238405Sjkim * One can argue that one should implement dummy placeholder for 67238405Sjkim * BIO_s_fd here... 68238405Sjkim */ 69238405Sjkim#else 70238405Sjkim/* 71160814Ssimon * As for unconditional usage of "UPLINK" interface in this module. 72160814Ssimon * Trouble is that unlike Unix file descriptors [which are indexes 73160814Ssimon * in kernel-side per-process table], corresponding descriptors on 74160814Ssimon * platforms which require "UPLINK" interface seem to be indexes 75160814Ssimon * in a user-land, non-global table. Well, in fact they are indexes 76160814Ssimon * in stdio _iob[], and recall that _iob[] was the very reason why 77160814Ssimon * "UPLINK" interface was introduced in first place. But one way on 78160814Ssimon * another. Neither libcrypto or libssl use this BIO meaning that 79160814Ssimon * file descriptors can only be provided by application. Therefore 80160814Ssimon * "UPLINK" calls are due... 81160814Ssimon */ 82280297Sjkim# include "bio_lcl.h" 8355714Skris 84109998Smarkmstatic int fd_write(BIO *h, const char *buf, int num); 85109998Smarkmstatic int fd_read(BIO *h, char *buf, int size); 86109998Smarkmstatic int fd_puts(BIO *h, const char *str); 87238405Sjkimstatic int fd_gets(BIO *h, char *buf, int size); 88109998Smarkmstatic long fd_ctrl(BIO *h, int cmd, long arg1, void *arg2); 89109998Smarkmstatic int fd_new(BIO *h); 90109998Smarkmstatic int fd_free(BIO *data); 91109998Smarkmint BIO_fd_should_retry(int s); 92109998Smarkm 93280297Sjkimstatic BIO_METHOD methods_fdp = { 94280297Sjkim BIO_TYPE_FD, "file descriptor", 95280297Sjkim fd_write, 96280297Sjkim fd_read, 97280297Sjkim fd_puts, 98280297Sjkim fd_gets, 99280297Sjkim fd_ctrl, 100280297Sjkim fd_new, 101280297Sjkim fd_free, 102280297Sjkim NULL, 103280297Sjkim}; 104109998Smarkm 105109998SmarkmBIO_METHOD *BIO_s_fd(void) 106280297Sjkim{ 107280297Sjkim return (&methods_fdp); 108280297Sjkim} 109109998Smarkm 110280297SjkimBIO *BIO_new_fd(int fd, int close_flag) 111280297Sjkim{ 112280297Sjkim BIO *ret; 113280297Sjkim ret = BIO_new(BIO_s_fd()); 114280297Sjkim if (ret == NULL) 115280297Sjkim return (NULL); 116280297Sjkim BIO_set_fd(ret, fd, close_flag); 117280297Sjkim return (ret); 118280297Sjkim} 119109998Smarkm 120109998Smarkmstatic int fd_new(BIO *bi) 121280297Sjkim{ 122280297Sjkim bi->init = 0; 123280297Sjkim bi->num = -1; 124280297Sjkim bi->ptr = NULL; 125280297Sjkim bi->flags = BIO_FLAGS_UPLINK; /* essentially redundant */ 126280297Sjkim return (1); 127280297Sjkim} 128109998Smarkm 129109998Smarkmstatic int fd_free(BIO *a) 130280297Sjkim{ 131280297Sjkim if (a == NULL) 132280297Sjkim return (0); 133280297Sjkim if (a->shutdown) { 134280297Sjkim if (a->init) { 135280297Sjkim UP_close(a->num); 136280297Sjkim } 137280297Sjkim a->init = 0; 138280297Sjkim a->flags = BIO_FLAGS_UPLINK; 139280297Sjkim } 140280297Sjkim return (1); 141280297Sjkim} 142109998Smarkm 143280297Sjkimstatic int fd_read(BIO *b, char *out, int outl) 144280297Sjkim{ 145280297Sjkim int ret = 0; 146109998Smarkm 147280297Sjkim if (out != NULL) { 148280297Sjkim clear_sys_error(); 149280297Sjkim ret = UP_read(b->num, out, outl); 150280297Sjkim BIO_clear_retry_flags(b); 151280297Sjkim if (ret <= 0) { 152280297Sjkim if (BIO_fd_should_retry(ret)) 153280297Sjkim BIO_set_retry_read(b); 154280297Sjkim } 155280297Sjkim } 156280297Sjkim return (ret); 157280297Sjkim} 158280297Sjkim 159109998Smarkmstatic int fd_write(BIO *b, const char *in, int inl) 160280297Sjkim{ 161280297Sjkim int ret; 162280297Sjkim clear_sys_error(); 163280297Sjkim ret = UP_write(b->num, in, inl); 164280297Sjkim BIO_clear_retry_flags(b); 165280297Sjkim if (ret <= 0) { 166280297Sjkim if (BIO_fd_should_retry(ret)) 167280297Sjkim BIO_set_retry_write(b); 168280297Sjkim } 169280297Sjkim return (ret); 170280297Sjkim} 171109998Smarkm 172109998Smarkmstatic long fd_ctrl(BIO *b, int cmd, long num, void *ptr) 173280297Sjkim{ 174280297Sjkim long ret = 1; 175280297Sjkim int *ip; 176109998Smarkm 177280297Sjkim switch (cmd) { 178280297Sjkim case BIO_CTRL_RESET: 179280297Sjkim num = 0; 180280297Sjkim case BIO_C_FILE_SEEK: 181280297Sjkim ret = (long)UP_lseek(b->num, num, 0); 182280297Sjkim break; 183280297Sjkim case BIO_C_FILE_TELL: 184280297Sjkim case BIO_CTRL_INFO: 185280297Sjkim ret = (long)UP_lseek(b->num, 0, 1); 186280297Sjkim break; 187280297Sjkim case BIO_C_SET_FD: 188280297Sjkim fd_free(b); 189280297Sjkim b->num = *((int *)ptr); 190280297Sjkim b->shutdown = (int)num; 191280297Sjkim b->init = 1; 192280297Sjkim break; 193280297Sjkim case BIO_C_GET_FD: 194280297Sjkim if (b->init) { 195280297Sjkim ip = (int *)ptr; 196280297Sjkim if (ip != NULL) 197280297Sjkim *ip = b->num; 198280297Sjkim ret = b->num; 199280297Sjkim } else 200280297Sjkim ret = -1; 201280297Sjkim break; 202280297Sjkim case BIO_CTRL_GET_CLOSE: 203280297Sjkim ret = b->shutdown; 204280297Sjkim break; 205280297Sjkim case BIO_CTRL_SET_CLOSE: 206280297Sjkim b->shutdown = (int)num; 207280297Sjkim break; 208280297Sjkim case BIO_CTRL_PENDING: 209280297Sjkim case BIO_CTRL_WPENDING: 210280297Sjkim ret = 0; 211280297Sjkim break; 212280297Sjkim case BIO_CTRL_DUP: 213280297Sjkim case BIO_CTRL_FLUSH: 214280297Sjkim ret = 1; 215280297Sjkim break; 216280297Sjkim default: 217280297Sjkim ret = 0; 218280297Sjkim break; 219280297Sjkim } 220280297Sjkim return (ret); 221280297Sjkim} 222109998Smarkm 223109998Smarkmstatic int fd_puts(BIO *bp, const char *str) 224280297Sjkim{ 225280297Sjkim int n, ret; 226109998Smarkm 227280297Sjkim n = strlen(str); 228280297Sjkim ret = fd_write(bp, str, n); 229280297Sjkim return (ret); 230280297Sjkim} 231109998Smarkm 232238405Sjkimstatic int fd_gets(BIO *bp, char *buf, int size) 233280297Sjkim{ 234280297Sjkim int ret = 0; 235280297Sjkim char *ptr = buf; 236280297Sjkim char *end = buf + size - 1; 237238405Sjkim 238280297Sjkim while ((ptr < end) && (fd_read(bp, ptr, 1) > 0) && (ptr[0] != '\n')) 239280297Sjkim ptr++; 240238405Sjkim 241280297Sjkim ptr[0] = '\0'; 242238405Sjkim 243280297Sjkim if (buf[0] != '\0') 244280297Sjkim ret = strlen(buf); 245280297Sjkim return (ret); 246280297Sjkim} 247238405Sjkim 248109998Smarkmint BIO_fd_should_retry(int i) 249280297Sjkim{ 250280297Sjkim int err; 251109998Smarkm 252280297Sjkim if ((i == 0) || (i == -1)) { 253280297Sjkim err = get_last_sys_error(); 254109998Smarkm 255280297Sjkim# if defined(OPENSSL_SYS_WINDOWS) && 0/* more microsoft stupidity? perhaps 256280297Sjkim * not? Ben 4/1/99 */ 257280297Sjkim if ((i == -1) && (err == 0)) 258280297Sjkim return (1); 259280297Sjkim# endif 260109998Smarkm 261280297Sjkim return (BIO_fd_non_fatal_error(err)); 262280297Sjkim } 263280297Sjkim return (0); 264280297Sjkim} 265109998Smarkm 266109998Smarkmint BIO_fd_non_fatal_error(int err) 267280297Sjkim{ 268280297Sjkim switch (err) { 269109998Smarkm 270280297Sjkim# ifdef EWOULDBLOCK 271280297Sjkim# ifdef WSAEWOULDBLOCK 272280297Sjkim# if WSAEWOULDBLOCK != EWOULDBLOCK 273280297Sjkim case EWOULDBLOCK: 274280297Sjkim# endif 275280297Sjkim# else 276280297Sjkim case EWOULDBLOCK: 277109998Smarkm# endif 278109998Smarkm# endif 279109998Smarkm 280280297Sjkim# if defined(ENOTCONN) 281280297Sjkim case ENOTCONN: 282280297Sjkim# endif 283109998Smarkm 284280297Sjkim# ifdef EINTR 285280297Sjkim case EINTR: 286280297Sjkim# endif 287109998Smarkm 288280297Sjkim# ifdef EAGAIN 289280297Sjkim# if EWOULDBLOCK != EAGAIN 290280297Sjkim case EAGAIN: 291280297Sjkim# endif 292109998Smarkm# endif 293109998Smarkm 294280297Sjkim# ifdef EPROTO 295280297Sjkim case EPROTO: 296280297Sjkim# endif 297109998Smarkm 298280297Sjkim# ifdef EINPROGRESS 299280297Sjkim case EINPROGRESS: 300280297Sjkim# endif 301109998Smarkm 302280297Sjkim# ifdef EALREADY 303280297Sjkim case EALREADY: 304280297Sjkim# endif 305280297Sjkim return (1); 306280297Sjkim /* break; */ 307280297Sjkim default: 308280297Sjkim break; 309280297Sjkim } 310280297Sjkim return (0); 311280297Sjkim} 312109998Smarkm#endif 313