diff options
Diffstat (limited to 'apps/bf_prefix.c')
| -rw-r--r-- | apps/bf_prefix.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/apps/bf_prefix.c b/apps/bf_prefix.c new file mode 100644 index 000000000000..bae3c91bf8b3 --- /dev/null +++ b/apps/bf_prefix.c @@ -0,0 +1,177 @@ +/* + * Copyright 2018 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (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 <openssl/bio.h> +#include "apps.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 BIO_METHOD *prefix_meth = NULL; + +BIO_METHOD *apps_bf_prefix(void) +{ + if (prefix_meth == NULL) { + if ((prefix_meth = + BIO_meth_new(BIO_TYPE_FILTER, "Prefix filter")) == NULL + || !BIO_meth_set_create(prefix_meth, prefix_create) + || !BIO_meth_set_destroy(prefix_meth, prefix_destroy) + || !BIO_meth_set_write_ex(prefix_meth, prefix_write) + || !BIO_meth_set_read_ex(prefix_meth, prefix_read) + || !BIO_meth_set_puts(prefix_meth, prefix_puts) + || !BIO_meth_set_gets(prefix_meth, prefix_gets) + || !BIO_meth_set_ctrl(prefix_meth, prefix_ctrl) + || !BIO_meth_set_callback_ctrl(prefix_meth, prefix_callback_ctrl)) { + BIO_meth_free(prefix_meth); + prefix_meth = NULL; + } + } + return prefix_meth; +} + +typedef struct prefix_ctx_st { + char *prefix; + 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->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, we've got nothing to do here */ + if (ctx->prefix == NULL || *ctx->prefix == '\0') { + /* We do note if what comes next will be a new line, though */ + 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 the prefix */ + if (ctx->linestart) { + size_t dontcare; + + if (!BIO_write_ex(BIO_next(b), ctx->prefix, strlen(ctx->prefix), + &dontcare)) + return 0; + 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; + + switch (cmd) { + case PREFIX_CTRL_SET_PREFIX: + { + PREFIX_CTX *ctx = BIO_get_data(b); + + if (ctx == NULL) + break; + + OPENSSL_free(ctx->prefix); + ctx->prefix = OPENSSL_strdup((const char *)ptr); + ret = ctx->prefix != NULL; + } + break; + default: + 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)); +} |