Adding upstream version 1:9.16.44.upstream/1%9.16.44

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 443 insertions, 0 deletions

diff --git a/lib/isc/base32.c b/lib/isc/base32.c
new file mode 100644
index 0000000..90c37c7
--- /dev/null
+++ b/lib/isc/base32.c
@@ -0,0 +1,443 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <stdbool.h>
+
+#include <isc/base32.h>
+#include <isc/buffer.h>
+#include <isc/lex.h>
+#include <isc/region.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#define RETERR(x)                        \
+	do {                             \
+		isc_result_t _r = (x);   \
+		if (_r != ISC_R_SUCCESS) \
+			return ((_r));   \
+	} while (0)
+
+/*@{*/
+/*!
+ * These static functions are also present in lib/dns/rdata.c.  I'm not
+ * sure where they should go. -- bwelling
+ */
+static isc_result_t
+str_totext(const char *source, isc_buffer_t *target);
+
+static isc_result_t
+mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length);
+
+/*@}*/
+
+static const char base32[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567="
+			     "abcdefghijklmnopqrstuvwxyz234567";
+static const char base32hex[] = "0123456789ABCDEFGHIJKLMNOPQRSTUV="
+				"0123456789abcdefghijklmnopqrstuv";
+
+static isc_result_t
+base32_totext(isc_region_t *source, int wordlength, const char *wordbreak,
+	      isc_buffer_t *target, const char base[], char pad) {
+	char buf[9];
+	unsigned int loops = 0;
+
+	if (wordlength >= 0 && wordlength < 8) {
+		wordlength = 8;
+	}
+
+	memset(buf, 0, sizeof(buf));
+	while (source->length > 0) {
+		buf[0] = base[((source->base[0] >> 3) & 0x1f)]; /* 5 + */
+		if (source->length == 1) {
+			buf[1] = base[(source->base[0] << 2) & 0x1c];
+			buf[2] = buf[3] = buf[4] = pad;
+			buf[5] = buf[6] = buf[7] = pad;
+			RETERR(str_totext(buf, target));
+			break;
+		}
+		buf[1] = base[((source->base[0] << 2) & 0x1c) | /* 3 = 8 */
+			      ((source->base[1] >> 6) & 0x03)]; /* 2 + */
+		buf[2] = base[((source->base[1] >> 1) & 0x1f)]; /* 5 + */
+		if (source->length == 2) {
+			buf[3] = base[(source->base[1] << 4) & 0x10];
+			buf[4] = buf[5] = buf[6] = buf[7] = pad;
+			RETERR(str_totext(buf, target));
+			break;
+		}
+		buf[3] = base[((source->base[1] << 4) & 0x10) | /* 1 = 8 */
+			      ((source->base[2] >> 4) & 0x0f)]; /* 4 + */
+		if (source->length == 3) {
+			buf[4] = base[(source->base[2] << 1) & 0x1e];
+			buf[5] = buf[6] = buf[7] = pad;
+			RETERR(str_totext(buf, target));
+			break;
+		}
+		buf[4] = base[((source->base[2] << 1) & 0x1e) | /* 4 = 8 */
+			      ((source->base[3] >> 7) & 0x01)]; /* 1 + */
+		buf[5] = base[((source->base[3] >> 2) & 0x1f)]; /* 5 + */
+		if (source->length == 4) {
+			buf[6] = base[(source->base[3] << 3) & 0x18];
+			buf[7] = pad;
+			RETERR(str_totext(buf, target));
+			break;
+		}
+		buf[6] = base[((source->base[3] << 3) & 0x18) | /* 2 = 8 */
+			      ((source->base[4] >> 5) & 0x07)]; /* 3 + */
+		buf[7] = base[source->base[4] & 0x1f];		/* 5 = 8 */
+		RETERR(str_totext(buf, target));
+		isc_region_consume(source, 5);
+
+		loops++;
+		if (source->length != 0 && wordlength >= 0 &&
+		    (int)((loops + 1) * 8) >= wordlength)
+		{
+			loops = 0;
+			RETERR(str_totext(wordbreak, target));
+		}
+	}
+	if (source->length > 0) {
+		isc_region_consume(source, source->length);
+	}
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_base32_totext(isc_region_t *source, int wordlength, const char *wordbreak,
+		  isc_buffer_t *target) {
+	return (base32_totext(source, wordlength, wordbreak, target, base32,
+			      '='));
+}
+
+isc_result_t
+isc_base32hex_totext(isc_region_t *source, int wordlength,
+		     const char *wordbreak, isc_buffer_t *target) {
+	return (base32_totext(source, wordlength, wordbreak, target, base32hex,
+			      '='));
+}
+
+isc_result_t
+isc_base32hexnp_totext(isc_region_t *source, int wordlength,
+		       const char *wordbreak, isc_buffer_t *target) {
+	return (base32_totext(source, wordlength, wordbreak, target, base32hex,
+			      0));
+}
+
+/*%
+ * State of a base32 decoding process in progress.
+ */
+typedef struct {
+	int length;	      /*%< Desired length of binary data or -1 */
+	isc_buffer_t *target; /*%< Buffer for resulting binary data */
+	int digits;	      /*%< Number of buffered base32 digits */
+	bool seen_end;	      /*%< True if "=" end marker seen */
+	int val[8];
+	const char *base; /*%< Which encoding we are using */
+	int seen_32;	  /*%< Number of significant bytes if non
+			   * zero */
+	bool pad;	  /*%< Expect padding */
+} base32_decode_ctx_t;
+
+static void
+base32_decode_init(base32_decode_ctx_t *ctx, int length, const char base[],
+		   bool pad, isc_buffer_t *target) {
+	ctx->digits = 0;
+	ctx->seen_end = false;
+	ctx->seen_32 = 0;
+	ctx->length = length;
+	ctx->target = target;
+	ctx->base = base;
+	ctx->pad = pad;
+}
+
+static isc_result_t
+base32_decode_char(base32_decode_ctx_t *ctx, int c) {
+	const char *s;
+	unsigned int last;
+
+	if (ctx->seen_end) {
+		return (ISC_R_BADBASE32);
+	}
+	if ((s = strchr(ctx->base, c)) == NULL) {
+		return (ISC_R_BADBASE32);
+	}
+	last = (unsigned int)(s - ctx->base);
+
+	/*
+	 * Handle lower case.
+	 */
+	if (last > 32) {
+		last -= 33;
+	}
+
+	/*
+	 * Check that padding is contiguous.
+	 */
+	if (last != 32 && ctx->seen_32 != 0) {
+		return (ISC_R_BADBASE32);
+	}
+
+	/*
+	 * If padding is not permitted flag padding as a error.
+	 */
+	if (last == 32 && !ctx->pad) {
+		return (ISC_R_BADBASE32);
+	}
+
+	/*
+	 * Check that padding starts at the right place and that
+	 * bits that should be zero are.
+	 * Record how many significant bytes in answer (seen_32).
+	 */
+	if (last == 32 && ctx->seen_32 == 0) {
+		switch (ctx->digits) {
+		case 0:
+		case 1:
+			return (ISC_R_BADBASE32);
+		case 2:
+			if ((ctx->val[1] & 0x03) != 0) {
+				return (ISC_R_BADBASE32);
+			}
+			ctx->seen_32 = 1;
+			break;
+		case 3:
+			return (ISC_R_BADBASE32);
+		case 4:
+			if ((ctx->val[3] & 0x0f) != 0) {
+				return (ISC_R_BADBASE32);
+			}
+			ctx->seen_32 = 2;
+			break;
+		case 5:
+			if ((ctx->val[4] & 0x01) != 0) {
+				return (ISC_R_BADBASE32);
+			}
+			ctx->seen_32 = 3;
+			break;
+		case 6:
+			return (ISC_R_BADBASE32);
+		case 7:
+			if ((ctx->val[6] & 0x07) != 0) {
+				return (ISC_R_BADBASE32);
+			}
+			ctx->seen_32 = 4;
+			break;
+		}
+	}
+
+	/*
+	 * Zero fill pad values.
+	 */
+	ctx->val[ctx->digits++] = (last == 32) ? 0 : last;
+
+	if (ctx->digits == 8) {
+		int n = 5;
+		unsigned char buf[5];
+
+		if (ctx->seen_32 != 0) {
+			ctx->seen_end = true;
+			n = ctx->seen_32;
+		}
+		buf[0] = (ctx->val[0] << 3) | (ctx->val[1] >> 2);
+		buf[1] = (ctx->val[1] << 6) | (ctx->val[2] << 1) |
+			 (ctx->val[3] >> 4);
+		buf[2] = (ctx->val[3] << 4) | (ctx->val[4] >> 1);
+		buf[3] = (ctx->val[4] << 7) | (ctx->val[5] << 2) |
+			 (ctx->val[6] >> 3);
+		buf[4] = (ctx->val[6] << 5) | (ctx->val[7]);
+		RETERR(mem_tobuffer(ctx->target, buf, n));
+		if (ctx->length >= 0) {
+			if (n > ctx->length) {
+				return (ISC_R_BADBASE32);
+			} else {
+				ctx->length -= n;
+			}
+		}
+		ctx->digits = 0;
+	}
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+base32_decode_finish(base32_decode_ctx_t *ctx) {
+	if (ctx->length > 0) {
+		return (ISC_R_UNEXPECTEDEND);
+	}
+	/*
+	 * Add missing padding if required.
+	 */
+	if (!ctx->pad && ctx->digits != 0) {
+		ctx->pad = true;
+		do {
+			RETERR(base32_decode_char(ctx, '='));
+		} while (ctx->digits != 0);
+	}
+	if (ctx->digits != 0) {
+		return (ISC_R_BADBASE32);
+	}
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+base32_tobuffer(isc_lex_t *lexer, const char base[], bool pad,
+		isc_buffer_t *target, int length) {
+	unsigned int before, after;
+	base32_decode_ctx_t ctx;
+	isc_textregion_t *tr;
+	isc_token_t token;
+	bool eol;
+
+	REQUIRE(length >= -2);
+
+	base32_decode_init(&ctx, length, base, pad, target);
+
+	before = isc_buffer_usedlength(target);
+	while (!ctx.seen_end && (ctx.length != 0)) {
+		unsigned int i;
+
+		if (length > 0) {
+			eol = false;
+		} else {
+			eol = true;
+		}
+		RETERR(isc_lex_getmastertoken(lexer, &token,
+					      isc_tokentype_string, eol));
+		if (token.type != isc_tokentype_string) {
+			break;
+		}
+		tr = &token.value.as_textregion;
+		for (i = 0; i < tr->length; i++) {
+			RETERR(base32_decode_char(&ctx, tr->base[i]));
+		}
+	}
+	after = isc_buffer_usedlength(target);
+	if (ctx.length < 0 && !ctx.seen_end) {
+		isc_lex_ungettoken(lexer, &token);
+	}
+	RETERR(base32_decode_finish(&ctx));
+	if (length == -2 && before == after) {
+		return (ISC_R_UNEXPECTEDEND);
+	}
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_base32_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
+	return (base32_tobuffer(lexer, base32, true, target, length));
+}
+
+isc_result_t
+isc_base32hex_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
+	return (base32_tobuffer(lexer, base32hex, true, target, length));
+}
+
+isc_result_t
+isc_base32hexnp_tobuffer(isc_lex_t *lexer, isc_buffer_t *target, int length) {
+	return (base32_tobuffer(lexer, base32hex, false, target, length));
+}
+
+static isc_result_t
+base32_decodestring(const char *cstr, const char base[], bool pad,
+		    isc_buffer_t *target) {
+	base32_decode_ctx_t ctx;
+
+	base32_decode_init(&ctx, -1, base, pad, target);
+	for (;;) {
+		int c = *cstr++;
+		if (c == '\0') {
+			break;
+		}
+		if (c == ' ' || c == '\t' || c == '\n' || c == '\r') {
+			continue;
+		}
+		RETERR(base32_decode_char(&ctx, c));
+	}
+	RETERR(base32_decode_finish(&ctx));
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_base32_decodestring(const char *cstr, isc_buffer_t *target) {
+	return (base32_decodestring(cstr, base32, true, target));
+}
+
+isc_result_t
+isc_base32hex_decodestring(const char *cstr, isc_buffer_t *target) {
+	return (base32_decodestring(cstr, base32hex, true, target));
+}
+
+isc_result_t
+isc_base32hexnp_decodestring(const char *cstr, isc_buffer_t *target) {
+	return (base32_decodestring(cstr, base32hex, false, target));
+}
+
+static isc_result_t
+base32_decoderegion(isc_region_t *source, const char base[], bool pad,
+		    isc_buffer_t *target) {
+	base32_decode_ctx_t ctx;
+
+	base32_decode_init(&ctx, -1, base, pad, target);
+	while (source->length != 0) {
+		int c = *source->base;
+		RETERR(base32_decode_char(&ctx, c));
+		isc_region_consume(source, 1);
+	}
+	RETERR(base32_decode_finish(&ctx));
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_base32_decoderegion(isc_region_t *source, isc_buffer_t *target) {
+	return (base32_decoderegion(source, base32, true, target));
+}
+
+isc_result_t
+isc_base32hex_decoderegion(isc_region_t *source, isc_buffer_t *target) {
+	return (base32_decoderegion(source, base32hex, true, target));
+}
+
+isc_result_t
+isc_base32hexnp_decoderegion(isc_region_t *source, isc_buffer_t *target) {
+	return (base32_decoderegion(source, base32hex, false, target));
+}
+
+static isc_result_t
+str_totext(const char *source, isc_buffer_t *target) {
+	unsigned int l;
+	isc_region_t region;
+
+	isc_buffer_availableregion(target, &region);
+	l = strlen(source);
+
+	if (l > region.length) {
+		return (ISC_R_NOSPACE);
+	}
+
+	memmove(region.base, source, l);
+	isc_buffer_add(target, l);
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+mem_tobuffer(isc_buffer_t *target, void *base, unsigned int length) {
+	isc_region_t tr;
+
+	isc_buffer_availableregion(target, &tr);
+	if (length > tr.length) {
+		return (ISC_R_NOSPACE);
+	}
+	memmove(tr.base, base, length);
+	isc_buffer_add(target, length);
+	return (ISC_R_SUCCESS);
+}