/* crypto/bio/bf_nbio.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <stdio.h> #include <errno.h> #include "cryptlib.h" #include <openssl/rand.h> #include <openssl/bio.h> /* BIO_put and BIO_get both add to the digest, * BIO_gets returns the digest */ static int nbiof_write(BIO *h,const char *buf,int num); static int nbiof_read(BIO *h,char *buf,int size); static int nbiof_puts(BIO *h,const char *str); static int nbiof_gets(BIO *h,char *str,int size); static long nbiof_ctrl(BIO *h,int cmd,long arg1,void *arg2); static int nbiof_new(BIO *h); static int nbiof_free(BIO *data); static long nbiof_callback_ctrl(BIO *h,int cmd,bio_info_cb *fp); typedef struct nbio_test_st { /* only set if we sent a 'should retry' error */ int lrn; int lwn; } NBIO_TEST; static BIO_METHOD methods_nbiof= { BIO_TYPE_NBIO_TEST, "non-blocking IO test filter", nbiof_write, nbiof_read, nbiof_puts, nbiof_gets, nbiof_ctrl, nbiof_new, nbiof_free, nbiof_callback_ctrl, }; BIO_METHOD *BIO_f_nbio_test(void) { return(&methods_nbiof); } static int nbiof_new(BIO *bi) { NBIO_TEST *nt; if (!(nt=(NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST)))) return(0); nt->lrn= -1; nt->lwn= -1; bi->ptr=(char *)nt; bi->init=1; bi->flags=0; return(1); } static int nbiof_free(BIO *a) { if (a == NULL) return(0); if (a->ptr != NULL) OPENSSL_free(a->ptr); a->ptr=NULL; a->init=0; a->flags=0; return(1); } static int nbiof_read(BIO *b, char *out, int outl) { NBIO_TEST *nt; int ret=0; #if 1 int num; unsigned char n; #endif if (out == NULL) return(0); if (b->next_bio == NULL) return(0); nt=(NBIO_TEST *)b->ptr; BIO_clear_retry_flags(b); #if 1 RAND_pseudo_bytes(&n,1); num=(n&0x07); if (outl > num) outl=num; if (num == 0) { ret= -1; BIO_set_retry_read(b); } else #endif { ret=BIO_read(b->next_bio,out,outl); if (ret < 0) BIO_copy_next_retry(b); } return(ret); } static int nbiof_write(BIO *b, const char *in, int inl) { NBIO_TEST *nt; int ret=0; int num; unsigned char n; if ((in == NULL) || (inl <= 0)) return(0); if (b->next_bio == NULL) return(0); nt=(NBIO_TEST *)b->ptr; BIO_clear_retry_flags(b); #if 1 if (nt->lwn > 0) { num=nt->lwn; nt->lwn=0; } else { RAND_pseudo_bytes(&n,1); num=(n&7); } if (inl > num) inl=num; if (num == 0) { ret= -1; BIO_set_retry_write(b); } else #endif { ret=BIO_write(b->next_bio,in,inl); if (ret < 0) { BIO_copy_next_retry(b); nt->lwn=inl; } } return(ret); } static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr) { long ret; if (b->next_bio == NULL) return(0); switch (cmd) { case BIO_C_DO_STATE_MACHINE: BIO_clear_retry_flags(b); ret=BIO_ctrl(b->next_bio,cmd,num,ptr); BIO_copy_next_retry(b); break; case BIO_CTRL_DUP: ret=0L; break; default: ret=BIO_ctrl(b->next_bio,cmd,num,ptr); break; } return(ret); } static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) { long ret=1; if (b->next_bio == NULL) return(0); switch (cmd) { default: ret=BIO_callback_ctrl(b->next_bio,cmd,fp); break; } return(ret); } static int nbiof_gets(BIO *bp, char *buf, int size) { if (bp->next_bio == NULL) return(0); return(BIO_gets(bp->next_bio,buf,size)); } static int nbiof_puts(BIO *bp, const char *str) { if (bp->next_bio == NULL) return(0); return(BIO_puts(bp->next_bio,str)); }