| /* |
| * Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <errno.h> |
| #include "bio_local.h" |
| |
| static int prefix_write(BIO *b, const char *out, size_t outl, |
| size_t *numwritten); |
| static int prefix_read(BIO *b, char *buf, size_t size, size_t *numread); |
| static int prefix_puts(BIO *b, const char *str); |
| static int prefix_gets(BIO *b, char *str, int size); |
| static long prefix_ctrl(BIO *b, int cmd, long arg1, void *arg2); |
| static int prefix_create(BIO *b); |
| static int prefix_destroy(BIO *b); |
| static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp); |
| |
| static const BIO_METHOD prefix_meth = { |
| BIO_TYPE_BUFFER, |
| "prefix", |
| prefix_write, |
| NULL, |
| prefix_read, |
| NULL, |
| prefix_puts, |
| prefix_gets, |
| prefix_ctrl, |
| prefix_create, |
| prefix_destroy, |
| prefix_callback_ctrl, |
| }; |
| |
| const BIO_METHOD *BIO_f_prefix(void) |
| { |
| return &prefix_meth; |
| } |
| |
| typedef struct prefix_ctx_st { |
| char *prefix; /* Text prefix, given by user */ |
| unsigned int indent; /* Indentation amount, given by user */ |
| |
| int linestart; /* flag to indicate we're at the line start */ |
| } PREFIX_CTX; |
| |
| static int prefix_create(BIO *b) |
| { |
| PREFIX_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); |
| |
| if (ctx == NULL) |
| return 0; |
| |
| ctx->prefix = NULL; |
| ctx->indent = 0; |
| ctx->linestart = 1; |
| BIO_set_data(b, ctx); |
| BIO_set_init(b, 1); |
| return 1; |
| } |
| |
| static int prefix_destroy(BIO *b) |
| { |
| PREFIX_CTX *ctx = BIO_get_data(b); |
| |
| OPENSSL_free(ctx->prefix); |
| OPENSSL_free(ctx); |
| return 1; |
| } |
| |
| static int prefix_read(BIO *b, char *in, size_t size, size_t *numread) |
| { |
| return BIO_read_ex(BIO_next(b), in, size, numread); |
| } |
| |
| static int prefix_write(BIO *b, const char *out, size_t outl, |
| size_t *numwritten) |
| { |
| PREFIX_CTX *ctx = BIO_get_data(b); |
| |
| if (ctx == NULL) |
| return 0; |
| |
| /* |
| * If no prefix is set or if it's empty, and no indentation amount is set, |
| * we've got nothing to do here |
| */ |
| if ((ctx->prefix == NULL || *ctx->prefix == '\0') |
| && ctx->indent == 0) { |
| /* |
| * We do note if what comes next will be a new line, though, so we're |
| * prepared to handle prefix and indentation the next time around. |
| */ |
| if (outl > 0) |
| ctx->linestart = (out[outl-1] == '\n'); |
| return BIO_write_ex(BIO_next(b), out, outl, numwritten); |
| } |
| |
| *numwritten = 0; |
| |
| while (outl > 0) { |
| size_t i; |
| char c; |
| |
| /* |
| * If we know that we're at the start of the line, output prefix and |
| * indentation. |
| */ |
| if (ctx->linestart) { |
| size_t dontcare; |
| |
| if (ctx->prefix != NULL |
| && !BIO_write_ex(BIO_next(b), ctx->prefix, strlen(ctx->prefix), |
| &dontcare)) |
| return 0; |
| BIO_printf(BIO_next(b), "%*s", ctx->indent, ""); |
| ctx->linestart = 0; |
| } |
| |
| /* Now, go look for the next LF, or the end of the string */ |
| for (i = 0, c = '\0'; i < outl && (c = out[i]) != '\n'; i++) |
| continue; |
| if (c == '\n') |
| i++; |
| |
| /* Output what we found so far */ |
| while (i > 0) { |
| size_t num = 0; |
| |
| if (!BIO_write_ex(BIO_next(b), out, i, &num)) |
| return 0; |
| out += num; |
| outl -= num; |
| *numwritten += num; |
| i -= num; |
| } |
| |
| /* If we found a LF, what follows is a new line, so take note */ |
| if (c == '\n') |
| ctx->linestart = 1; |
| } |
| |
| return 1; |
| } |
| |
| static long prefix_ctrl(BIO *b, int cmd, long num, void *ptr) |
| { |
| long ret = 0; |
| PREFIX_CTX *ctx; |
| |
| if (b == NULL || (ctx = BIO_get_data(b)) == NULL) |
| return -1; |
| |
| switch (cmd) { |
| case BIO_CTRL_SET_PREFIX: |
| OPENSSL_free(ctx->prefix); |
| if (ptr == NULL) { |
| ctx->prefix = NULL; |
| ret = 1; |
| } else { |
| ctx->prefix = OPENSSL_strdup((const char *)ptr); |
| ret = ctx->prefix != NULL; |
| } |
| break; |
| case BIO_CTRL_SET_INDENT: |
| if (num >= 0) { |
| ctx->indent = (unsigned int)num; |
| ret = 1; |
| } |
| break; |
| case BIO_CTRL_GET_INDENT: |
| ret = (long)ctx->indent; |
| break; |
| default: |
| /* Commands that we intercept before passing them along */ |
| switch (cmd) { |
| case BIO_C_FILE_SEEK: |
| case BIO_CTRL_RESET: |
| ctx->linestart = 1; |
| break; |
| } |
| if (BIO_next(b) != NULL) |
| ret = BIO_ctrl(BIO_next(b), cmd, num, ptr); |
| break; |
| } |
| return ret; |
| } |
| |
| static long prefix_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) |
| { |
| return BIO_callback_ctrl(BIO_next(b), cmd, fp); |
| } |
| |
| static int prefix_gets(BIO *b, char *buf, int size) |
| { |
| return BIO_gets(BIO_next(b), buf, size); |
| } |
| |
| static int prefix_puts(BIO *b, const char *str) |
| { |
| return BIO_write(b, str, strlen(str)); |
| } |