From 2288b178e612386e7a75471c8861c3f6d81c300d Mon Sep 17 00:00:00 2001
From: Cameron Katri <me@cameronkatri.com>
Date: Sat, 21 May 2022 23:44:49 -0400
Subject: Add tc remove and append -f flags

Also fix some conflicting types to hopefully prevent possible overflows.
---
 remove.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 remove.c

(limited to 'remove.c')

diff --git a/remove.c b/remove.c
new file mode 100644
index 0000000..442a9e2
--- /dev/null
+++ b/remove.c
@@ -0,0 +1,120 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 Cameron Katri.  All rights reserved.
+ *
+ * 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 above 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CAMERON KATRI AND CONTRIBUTORS ``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 CAMERON KATRI 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.
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "trustcache.h"
+#include "uuid/uuid.h"
+
+int
+tcremove(int argc, char **argv)
+{
+	bool keepuuid = false;
+	int numremoved = 0;
+
+	int ch;
+	while ((ch = getopt(argc, argv, "k")) != -1) {
+		switch (ch) {
+			case 'k':
+				keepuuid = true;
+				break;
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 2)
+		return -1;
+
+	FILE *f = NULL;
+	struct trust_cache cache = opentrustcache(argv[0]);
+
+	if (!keepuuid)
+		uuid_generate(cache.uuid);
+
+	uint8_t hash[CS_CDHASH_LEN] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+
+	for (int i = 1; i < argc; i++) {
+		if (strlen(argv[i]) != 40) {
+			fprintf(stderr, "%s is not a valid CDHash\n", argv[i]);
+			exit(1);
+		}
+		for (size_t j = 0; j < CS_CDHASH_LEN; j++)
+			sscanf(argv[i] + 2 * j, "%02hhx", &hash[j]);
+
+		uint32_t j = 0;
+		while (j < cache.num_entries) {
+			if (cache.version == 0) {
+				if (memcmp(cache.hashes[j], hash, CS_CDHASH_LEN) == 0) {
+					memmove(&cache.hashes[j], &cache.hashes[j + 1], (cache.num_entries - j - 1) * sizeof(trust_cache_hash0));
+					cache.num_entries--;
+					numremoved++;
+					continue;
+				}
+			} else if (cache.version == 1) {
+				if (memcmp(cache.entries[j].cdhash, hash, CS_CDHASH_LEN) == 0) {
+					memmove(&cache.entries[j], &cache.entries[j + 1], (cache.num_entries - j - 1) * sizeof(struct trust_cache_entry1));
+					cache.num_entries--;
+					numremoved++;
+					continue;
+				}
+			}
+			j++;
+		}
+		for (size_t j = 0; j < CS_CDHASH_LEN; j++)
+			hash[j] = 0;
+	}
+
+	if ((f = fopen(argv[0], "wb")) == NULL) {
+		fprintf(stderr, "%s: %s\n", argv[0], strerror(errno));
+		return 1;
+	}
+
+	cache.version = htole32(cache.version);
+	cache.num_entries = htole32(cache.num_entries);
+	fwrite(&cache, sizeof(struct trust_cache) - sizeof(struct trust_cache_entry1*), 1, f);
+	cache.version = le32toh(cache.version);
+	cache.num_entries = le32toh(cache.num_entries);
+
+	for (uint32_t i = 0; i < cache.num_entries; i++) {
+		if (cache.version == 0)
+			fwrite(&cache.hashes[i], sizeof(trust_cache_hash0), 1, f);
+		else if (cache.version == 1)
+			fwrite(&cache.entries[i], sizeof(struct trust_cache_entry1), 1, f);
+	}
+
+	printf("Removed %i %s\n", numremoved, numremoved == 1 ? "entry" : "entries");
+
+	return 0;
+}
-- 
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