/* $OpenBSD: bss_mem.c,v 1.14 2015/03/21 08:05:20 doug Exp $ */ /* 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 #include #include #include #include #include static int mem_write(BIO *h, const char *buf, int num); static int mem_read(BIO *h, char *buf, int size); static int mem_puts(BIO *h, const char *str); static int mem_gets(BIO *h, char *str, int size); static long mem_ctrl(BIO *h, int cmd, long arg1, void *arg2); static int mem_new(BIO *h); static int mem_free(BIO *data); static BIO_METHOD mem_method = { .type = BIO_TYPE_MEM, .name = "memory buffer", .bwrite = mem_write, .bread = mem_read, .bputs = mem_puts, .bgets = mem_gets, .ctrl = mem_ctrl, .create = mem_new, .destroy = mem_free }; /* bio->num is used to hold the value to return on 'empty', if it is * 0, should_retry is not set */ BIO_METHOD * BIO_s_mem(void) { return (&mem_method); } BIO * BIO_new_mem_buf(void *buf, int len) { BIO *ret; BUF_MEM *b; size_t sz; if (!buf) { BIOerr(BIO_F_BIO_NEW_MEM_BUF, BIO_R_NULL_PARAMETER); return NULL; } sz = (len < 0) ? strlen(buf) : (size_t)len; if (!(ret = BIO_new(BIO_s_mem()))) return NULL; b = (BUF_MEM *)ret->ptr; b->data = buf; b->length = sz; b->max = sz; ret->flags |= BIO_FLAGS_MEM_RDONLY; /* Since this is static data retrying wont help */ ret->num = 0; return ret; } static int mem_new(BIO *bi) { BUF_MEM *b; if ((b = BUF_MEM_new()) == NULL) return (0); bi->shutdown = 1; bi->init = 1; bi->num = -1; bi->ptr = (char *)b; return (1); } static int mem_free(BIO *a) { if (a == NULL) return (0); if (a->shutdown) { if ((a->init) && (a->ptr != NULL)) { BUF_MEM *b; b = (BUF_MEM *)a->ptr; if (a->flags & BIO_FLAGS_MEM_RDONLY) b->data = NULL; BUF_MEM_free(b); a->ptr = NULL; } } return (1); } static int mem_read(BIO *b, char *out, int outl) { int ret = -1; BUF_MEM *bm; bm = (BUF_MEM *)b->ptr; BIO_clear_retry_flags(b); ret = (outl >=0 && (size_t)outl > bm->length) ? (int)bm->length : outl; if ((out != NULL) && (ret > 0)) { memcpy(out, bm->data, ret); bm->length -= ret; if (b->flags & BIO_FLAGS_MEM_RDONLY) bm->data += ret; else { memmove(&(bm->data[0]), &(bm->data[ret]), bm->length); } } else if (bm->length == 0) { ret = b->num; if (ret != 0) BIO_set_retry_read(b); } return (ret); } static int mem_write(BIO *b, const char *in, int inl) { int ret = -1; int blen; BUF_MEM *bm; bm = (BUF_MEM *)b->ptr; if (in == NULL) { BIOerr(BIO_F_MEM_WRITE, BIO_R_NULL_PARAMETER); goto end; } if (b->flags & BIO_FLAGS_MEM_RDONLY) { BIOerr(BIO_F_MEM_WRITE, BIO_R_WRITE_TO_READ_ONLY_BIO); goto end; } BIO_clear_retry_flags(b); blen = bm->length; if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl)) goto end; memcpy(&(bm->data[blen]), in, inl); ret = inl; end: return (ret); } static long mem_ctrl(BIO *b, int cmd, long num, void *ptr) { long ret = 1; char **pptr; BUF_MEM *bm = (BUF_MEM *)b->ptr; switch (cmd) { case BIO_CTRL_RESET: if (bm->data != NULL) { /* For read only case reset to the start again */ if (b->flags & BIO_FLAGS_MEM_RDONLY) { bm->data -= bm->max - bm->length; bm->length = bm->max; } else { memset(bm->data, 0, bm->max); bm->length = 0; } } break; case BIO_CTRL_EOF: ret = (long)(bm->length == 0); break; case BIO_C_SET_BUF_MEM_EOF_RETURN: b->num = (int)num; break; case BIO_CTRL_INFO: ret = (long)bm->length; if (ptr != NULL) { pptr = (char **)ptr; *pptr = (char *)&(bm->data[0]); } break; case BIO_C_SET_BUF_MEM: mem_free(b); b->shutdown = (int)num; b->ptr = ptr; break; case BIO_C_GET_BUF_MEM_PTR: if (ptr != NULL) { pptr = (char **)ptr; *pptr = (char *)bm; } break; case BIO_CTRL_GET_CLOSE: ret = (long)b->shutdown; break; case BIO_CTRL_SET_CLOSE: b->shutdown = (int)num; break; case BIO_CTRL_WPENDING: ret = 0L; break; case BIO_CTRL_PENDING: ret = (long)bm->length; break; case BIO_CTRL_DUP: case BIO_CTRL_FLUSH: ret = 1; break; case BIO_CTRL_PUSH: case BIO_CTRL_POP: default: ret = 0; break; } return (ret); } static int mem_gets(BIO *bp, char *buf, int size) { int i, j; int ret = -1; char *p; BUF_MEM *bm = (BUF_MEM *)bp->ptr; BIO_clear_retry_flags(bp); j = bm->length; if ((size - 1) < j) j = size - 1; if (j <= 0) { *buf = '\0'; return 0; } p = bm->data; for (i = 0; i < j; i++) { if (p[i] == '\n') { i++; break; } } /* * i is now the max num of bytes to copy, either j or up to * and including the first newline */ i = mem_read(bp, buf, i); if (i > 0) buf[i] = '\0'; ret = i; return (ret); } static int mem_puts(BIO *bp, const char *str) { int n, ret; n = strlen(str); ret = mem_write(bp, str, n); /* memory semantics is that it will always work */ return (ret); }