Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/libfreerdp/utils/pcap.c

@@ -0,0 +1,260 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ * pcap File Format Utils
+ *
+ * Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <freerdp/config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <winpr/wtypes.h>
+#include <winpr/assert.h>
+#include <winpr/file.h>
+#include <winpr/crt.h>
+#include <winpr/sysinfo.h>
+
+#include <freerdp/types.h>
+#include <freerdp/utils/pcap.h>
+
+#define PCAP_MAGIC 0xA1B2C3D4
+
+struct rdp_pcap
+{
+	FILE* fp;
+	char* name;
+	BOOL write;
+	INT64 file_size;
+	size_t record_count;
+	pcap_header header;
+	pcap_record* head;
+	pcap_record* tail;
+	pcap_record* record;
+};
+
+static BOOL pcap_read_header(rdpPcap* pcap, pcap_header* header)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(header);
+
+	return fread(header, sizeof(pcap_header), 1, pcap->fp) == 1;
+}
+
+static BOOL pcap_write_header(rdpPcap* pcap, const pcap_header* header)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(header);
+
+	return fwrite(header, sizeof(pcap_header), 1, pcap->fp) == 1;
+}
+
+static BOOL pcap_read_record_header(rdpPcap* pcap, pcap_record_header* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	return fread(record, sizeof(pcap_record_header), 1, pcap->fp) == 1;
+}
+
+static BOOL pcap_write_record_header(rdpPcap* pcap, const pcap_record_header* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	return fwrite(record, sizeof(pcap_record_header), 1, pcap->fp) == 1;
+}
+
+static BOOL pcap_read_record(rdpPcap* pcap, pcap_record* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	if (!pcap_read_record_header(pcap, &record->header))
+		return FALSE;
+
+	record->length = record->header.incl_len;
+	record->data = malloc(record->length);
+	if (!record->data)
+		return FALSE;
+
+	if (fread(record->data, record->length, 1, pcap->fp) != 1)
+	{
+		free(record->data);
+		record->data = nullptr;
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static BOOL pcap_write_record(rdpPcap* pcap, const pcap_record* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	return pcap_write_record_header(pcap, &record->header) &&
+	       (fwrite(record->cdata, record->length, 1, pcap->fp) == 1);
+}
+
+BOOL pcap_add_record(rdpPcap* pcap, const void* data, size_t length)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(data || (length == 0));
+	WINPR_ASSERT(length <= UINT32_MAX);
+
+	pcap_record* record = (pcap_record*)calloc(1, sizeof(pcap_record));
+	if (!record)
+		return FALSE;
+
+	record->cdata = data;
+	record->length = (UINT32)length;
+	record->header.incl_len = (UINT32)length;
+	record->header.orig_len = (UINT32)length;
+
+	const UINT64 ns = winpr_GetUnixTimeNS();
+
+	record->header.ts_sec = (UINT32)WINPR_TIME_NS_TO_S(ns);
+	record->header.ts_usec = (UINT32)WINPR_TIME_NS_REM_US(ns);
+
+	if (pcap->tail == nullptr)
+	{
+		pcap->tail = record;
+		if (!pcap->tail)
+			return FALSE;
+
+		pcap->head = pcap->tail;
+	}
+	else
+	{
+		record->next = pcap->tail;
+		pcap->tail = record;
+	}
+
+	if (pcap->record == nullptr)
+		pcap->record = record;
+
+	return TRUE;
+}
+
+BOOL pcap_has_next_record(const rdpPcap* pcap)
+{
+	WINPR_ASSERT(pcap);
+
+	return (pcap->file_size - (_ftelli64(pcap->fp)) > 16);
+}
+
+BOOL pcap_get_next_record_header(rdpPcap* pcap, pcap_record* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	if (pcap_has_next_record(pcap) != TRUE)
+		return FALSE;
+
+	pcap_read_record_header(pcap, &record->header);
+	record->length = record->header.incl_len;
+
+	return TRUE;
+}
+
+BOOL pcap_get_next_record_content(rdpPcap* pcap, pcap_record* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	return fread(record->data, record->length, 1, pcap->fp) == 1;
+}
+
+BOOL pcap_get_next_record(rdpPcap* pcap, pcap_record* record)
+{
+	WINPR_ASSERT(pcap);
+	WINPR_ASSERT(record);
+
+	return pcap_has_next_record(pcap) && pcap_read_record(pcap, record);
+}
+
+rdpPcap* pcap_open(const char* name, BOOL write)
+{
+	WINPR_ASSERT(name);
+
+	rdpPcap* pcap = (rdpPcap*)calloc(1, sizeof(rdpPcap));
+	if (!pcap)
+		goto fail;
+
+	pcap->name = _strdup(name);
+	pcap->write = write;
+	pcap->record_count = 0;
+	pcap->fp = winpr_fopen(name, write ? "w+b" : "rb");
+
+	if (pcap->fp == nullptr)
+		goto fail;
+
+	if (write)
+	{
+		pcap->header.magic_number = PCAP_MAGIC;
+		pcap->header.version_major = 2;
+		pcap->header.version_minor = 4;
+		pcap->header.thiszone = 0;
+		pcap->header.sigfigs = 0;
+		pcap->header.snaplen = UINT32_MAX;
+		pcap->header.network = 0;
+		if (!pcap_write_header(pcap, &pcap->header))
+			goto fail;
+	}
+	else
+	{
+		(void)_fseeki64(pcap->fp, 0, SEEK_END);
+		pcap->file_size = _ftelli64(pcap->fp);
+		(void)_fseeki64(pcap->fp, 0, SEEK_SET);
+		if (!pcap_read_header(pcap, &pcap->header))
+			goto fail;
+	}
+
+	return pcap;
+
+fail:
+	pcap_close(pcap);
+	return nullptr;
+}
+
+void pcap_flush(rdpPcap* pcap)
+{
+	WINPR_ASSERT(pcap);
+
+	while (pcap->record != nullptr)
+	{
+		(void)pcap_write_record(pcap, pcap->record);
+		pcap->record = pcap->record->next;
+	}
+
+	if (pcap->fp != nullptr)
+		(void)fflush(pcap->fp);
+}
+
+void pcap_close(rdpPcap* pcap)
+{
+	if (!pcap)
+		return;
+
+	pcap_flush(pcap);
+
+	if (pcap->fp != nullptr)
+		(void)fclose(pcap->fp);
+
+	free(pcap->name);
+	free(pcap);
+}