[331] | 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include <errno.h>
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| 12 | #include "bio_lcl.h"
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| 13 | #include "internal/cryptlib.h"
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| 14 | #include <openssl/evp.h>
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| 15 |
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| 16 | static int linebuffer_write(BIO *h, const char *buf, int num);
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| 17 | static int linebuffer_read(BIO *h, char *buf, int size);
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| 18 | static int linebuffer_puts(BIO *h, const char *str);
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| 19 | static int linebuffer_gets(BIO *h, char *str, int size);
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| 20 | static long linebuffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
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| 21 | static int linebuffer_new(BIO *h);
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| 22 | static int linebuffer_free(BIO *data);
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| 23 | static long linebuffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
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| 24 |
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| 25 | /* A 10k maximum should be enough for most purposes */
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| 26 | #define DEFAULT_LINEBUFFER_SIZE 1024*10
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| 27 |
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| 28 | /* #define DEBUG */
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| 29 |
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| 30 | static const BIO_METHOD methods_linebuffer = {
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| 31 | BIO_TYPE_LINEBUFFER,
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| 32 | "linebuffer",
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| 33 | linebuffer_write,
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| 34 | linebuffer_read,
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| 35 | linebuffer_puts,
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| 36 | linebuffer_gets,
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| 37 | linebuffer_ctrl,
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| 38 | linebuffer_new,
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| 39 | linebuffer_free,
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| 40 | linebuffer_callback_ctrl,
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| 41 | };
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| 42 |
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| 43 | const BIO_METHOD *BIO_f_linebuffer(void)
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| 44 | {
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| 45 | return (&methods_linebuffer);
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| 46 | }
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| 47 |
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| 48 | typedef struct bio_linebuffer_ctx_struct {
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| 49 | char *obuf; /* the output char array */
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| 50 | int obuf_size; /* how big is the output buffer */
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| 51 | int obuf_len; /* how many bytes are in it */
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| 52 | } BIO_LINEBUFFER_CTX;
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| 53 |
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| 54 | static int linebuffer_new(BIO *bi)
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| 55 | {
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| 56 | BIO_LINEBUFFER_CTX *ctx;
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| 57 |
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| 58 | ctx = OPENSSL_malloc(sizeof(*ctx));
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| 59 | if (ctx == NULL)
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| 60 | return (0);
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| 61 | ctx->obuf = OPENSSL_malloc(DEFAULT_LINEBUFFER_SIZE);
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| 62 | if (ctx->obuf == NULL) {
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| 63 | OPENSSL_free(ctx);
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| 64 | return (0);
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| 65 | }
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| 66 | ctx->obuf_size = DEFAULT_LINEBUFFER_SIZE;
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| 67 | ctx->obuf_len = 0;
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| 68 |
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| 69 | bi->init = 1;
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| 70 | bi->ptr = (char *)ctx;
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| 71 | bi->flags = 0;
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| 72 | return (1);
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| 73 | }
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| 74 |
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| 75 | static int linebuffer_free(BIO *a)
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| 76 | {
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| 77 | BIO_LINEBUFFER_CTX *b;
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| 78 |
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| 79 | if (a == NULL)
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| 80 | return (0);
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| 81 | b = (BIO_LINEBUFFER_CTX *)a->ptr;
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| 82 | OPENSSL_free(b->obuf);
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| 83 | OPENSSL_free(a->ptr);
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| 84 | a->ptr = NULL;
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| 85 | a->init = 0;
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| 86 | a->flags = 0;
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| 87 | return (1);
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| 88 | }
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| 89 |
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| 90 | static int linebuffer_read(BIO *b, char *out, int outl)
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| 91 | {
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| 92 | int ret = 0;
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| 93 |
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| 94 | if (out == NULL)
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| 95 | return (0);
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| 96 | if (b->next_bio == NULL)
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| 97 | return (0);
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| 98 | ret = BIO_read(b->next_bio, out, outl);
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| 99 | BIO_clear_retry_flags(b);
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| 100 | BIO_copy_next_retry(b);
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| 101 | return (ret);
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| 102 | }
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| 103 |
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| 104 | static int linebuffer_write(BIO *b, const char *in, int inl)
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| 105 | {
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| 106 | int i, num = 0, foundnl;
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| 107 | BIO_LINEBUFFER_CTX *ctx;
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| 108 |
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| 109 | if ((in == NULL) || (inl <= 0))
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| 110 | return (0);
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| 111 | ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
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| 112 | if ((ctx == NULL) || (b->next_bio == NULL))
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| 113 | return (0);
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| 114 |
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| 115 | BIO_clear_retry_flags(b);
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| 116 |
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| 117 | do {
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| 118 | const char *p;
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| 119 |
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| 120 | for (p = in; p < in + inl && *p != '\n'; p++) ;
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| 121 | if (*p == '\n') {
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| 122 | p++;
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| 123 | foundnl = 1;
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| 124 | } else
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| 125 | foundnl = 0;
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| 126 |
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| 127 | /*
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| 128 | * If a NL was found and we already have text in the save buffer,
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| 129 | * concatenate them and write
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| 130 | */
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| 131 | while ((foundnl || p - in > ctx->obuf_size - ctx->obuf_len)
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| 132 | && ctx->obuf_len > 0) {
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| 133 | int orig_olen = ctx->obuf_len;
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| 134 |
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| 135 | i = ctx->obuf_size - ctx->obuf_len;
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| 136 | if (p - in > 0) {
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| 137 | if (i >= p - in) {
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| 138 | memcpy(&(ctx->obuf[ctx->obuf_len]), in, p - in);
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| 139 | ctx->obuf_len += p - in;
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| 140 | inl -= p - in;
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| 141 | num += p - in;
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| 142 | in = p;
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| 143 | } else {
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| 144 | memcpy(&(ctx->obuf[ctx->obuf_len]), in, i);
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| 145 | ctx->obuf_len += i;
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| 146 | inl -= i;
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| 147 | in += i;
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| 148 | num += i;
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| 149 | }
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| 150 | }
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| 151 | i = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
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| 152 | if (i <= 0) {
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| 153 | ctx->obuf_len = orig_olen;
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| 154 | BIO_copy_next_retry(b);
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| 155 |
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| 156 | if (i < 0)
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| 157 | return ((num > 0) ? num : i);
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| 158 | if (i == 0)
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| 159 | return (num);
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| 160 | }
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| 161 | if (i < ctx->obuf_len)
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| 162 | memmove(ctx->obuf, ctx->obuf + i, ctx->obuf_len - i);
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| 163 | ctx->obuf_len -= i;
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| 164 | }
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| 165 |
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| 166 | /*
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| 167 | * Now that the save buffer is emptied, let's write the input buffer
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| 168 | * if a NL was found and there is anything to write.
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| 169 | */
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| 170 | if ((foundnl || p - in > ctx->obuf_size) && p - in > 0) {
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| 171 | i = BIO_write(b->next_bio, in, p - in);
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| 172 | if (i <= 0) {
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| 173 | BIO_copy_next_retry(b);
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| 174 | if (i < 0)
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| 175 | return ((num > 0) ? num : i);
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| 176 | if (i == 0)
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| 177 | return (num);
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| 178 | }
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| 179 | num += i;
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| 180 | in += i;
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| 181 | inl -= i;
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| 182 | }
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| 183 | }
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| 184 | while (foundnl && inl > 0);
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| 185 | /*
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| 186 | * We've written as much as we can. The rest of the input buffer, if
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| 187 | * any, is text that doesn't and with a NL and therefore needs to be
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| 188 | * saved for the next trip.
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| 189 | */
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| 190 | if (inl > 0) {
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| 191 | memcpy(&(ctx->obuf[ctx->obuf_len]), in, inl);
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| 192 | ctx->obuf_len += inl;
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| 193 | num += inl;
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| 194 | }
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| 195 | return num;
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| 196 | }
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| 197 |
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| 198 | static long linebuffer_ctrl(BIO *b, int cmd, long num, void *ptr)
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| 199 | {
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| 200 | BIO *dbio;
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| 201 | BIO_LINEBUFFER_CTX *ctx;
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| 202 | long ret = 1;
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| 203 | char *p;
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| 204 | int r;
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| 205 | int obs;
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| 206 |
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| 207 | ctx = (BIO_LINEBUFFER_CTX *)b->ptr;
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| 208 |
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| 209 | switch (cmd) {
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| 210 | case BIO_CTRL_RESET:
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| 211 | ctx->obuf_len = 0;
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| 212 | if (b->next_bio == NULL)
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| 213 | return (0);
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| 214 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 215 | break;
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| 216 | case BIO_CTRL_INFO:
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| 217 | ret = (long)ctx->obuf_len;
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| 218 | break;
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| 219 | case BIO_CTRL_WPENDING:
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| 220 | ret = (long)ctx->obuf_len;
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| 221 | if (ret == 0) {
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| 222 | if (b->next_bio == NULL)
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| 223 | return (0);
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| 224 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 225 | }
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| 226 | break;
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| 227 | case BIO_C_SET_BUFF_SIZE:
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| 228 | obs = (int)num;
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| 229 | p = ctx->obuf;
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| 230 | if ((obs > DEFAULT_LINEBUFFER_SIZE) && (obs != ctx->obuf_size)) {
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| 231 | p = OPENSSL_malloc((int)num);
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| 232 | if (p == NULL)
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| 233 | goto malloc_error;
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| 234 | }
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| 235 | if (ctx->obuf != p) {
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| 236 | if (ctx->obuf_len > obs) {
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| 237 | ctx->obuf_len = obs;
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| 238 | }
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| 239 | memcpy(p, ctx->obuf, ctx->obuf_len);
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| 240 | OPENSSL_free(ctx->obuf);
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| 241 | ctx->obuf = p;
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| 242 | ctx->obuf_size = obs;
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| 243 | }
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| 244 | break;
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| 245 | case BIO_C_DO_STATE_MACHINE:
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| 246 | if (b->next_bio == NULL)
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| 247 | return (0);
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| 248 | BIO_clear_retry_flags(b);
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| 249 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 250 | BIO_copy_next_retry(b);
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| 251 | break;
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| 252 |
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| 253 | case BIO_CTRL_FLUSH:
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| 254 | if (b->next_bio == NULL)
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| 255 | return (0);
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| 256 | if (ctx->obuf_len <= 0) {
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| 257 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 258 | break;
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| 259 | }
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| 260 |
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| 261 | for (;;) {
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| 262 | BIO_clear_retry_flags(b);
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| 263 | if (ctx->obuf_len > 0) {
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| 264 | r = BIO_write(b->next_bio, ctx->obuf, ctx->obuf_len);
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| 265 | BIO_copy_next_retry(b);
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| 266 | if (r <= 0)
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| 267 | return ((long)r);
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| 268 | if (r < ctx->obuf_len)
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| 269 | memmove(ctx->obuf, ctx->obuf + r, ctx->obuf_len - r);
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| 270 | ctx->obuf_len -= r;
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| 271 | } else {
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| 272 | ctx->obuf_len = 0;
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| 273 | break;
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| 274 | }
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| 275 | }
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| 276 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 277 | break;
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| 278 | case BIO_CTRL_DUP:
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| 279 | dbio = (BIO *)ptr;
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| 280 | if (!BIO_set_write_buffer_size(dbio, ctx->obuf_size))
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| 281 | ret = 0;
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| 282 | break;
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| 283 | default:
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| 284 | if (b->next_bio == NULL)
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| 285 | return (0);
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| 286 | ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
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| 287 | break;
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| 288 | }
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| 289 | return (ret);
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| 290 | malloc_error:
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| 291 | BIOerr(BIO_F_LINEBUFFER_CTRL, ERR_R_MALLOC_FAILURE);
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| 292 | return (0);
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| 293 | }
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| 294 |
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| 295 | static long linebuffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
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| 296 | {
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| 297 | long ret = 1;
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| 298 |
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| 299 | if (b->next_bio == NULL)
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| 300 | return (0);
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| 301 | switch (cmd) {
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| 302 | default:
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| 303 | ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
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| 304 | break;
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| 305 | }
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| 306 | return (ret);
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| 307 | }
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| 308 |
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| 309 | static int linebuffer_gets(BIO *b, char *buf, int size)
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| 310 | {
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| 311 | if (b->next_bio == NULL)
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| 312 | return (0);
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| 313 | return (BIO_gets(b->next_bio, buf, size));
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| 314 | }
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| 315 |
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| 316 | static int linebuffer_puts(BIO *b, const char *str)
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| 317 | {
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| 318 | return (linebuffer_write(b, str, strlen(str)));
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| 319 | }
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