Index: uspace/lib/pcap/src/pcap_dumper.c
===================================================================
--- uspace/lib/pcap/src/pcap_dumper.c	(revision 3a4c6d93a7348ed56f730d1686fe37062c67f586)
+++ uspace/lib/pcap/src/pcap_dumper.c	(revision 3a4c6d93a7348ed56f730d1686fe37062c67f586)
@@ -0,0 +1,270 @@
+/*
+ * Copyright (c) 2023 Nataliia Korop
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
+ */
+
+/** @addtogroup libpcap
+ * @{
+ */
+/** @file Pcap dumper. Structure is a part of every device that is in category PCAP and can dump packets.
+ */
+
+#include <errno.h>
+#include <str.h>
+#include <io/log.h>
+#include "pcap_dumper.h"
+
+#define SHORT_OPS_BYTE_COUNT 0x3C
+
+/** Initialize writing to .pcap file.
+ *
+ * @param writer    Interface for writing data.
+ * @param filename  Name of the file for dumping packets.
+ * @return          EOK on success, otherwise an error code.
+ *
+ */
+static errno_t pcap_writer_to_file_init(pcap_writer_t *writer, const char *filename)
+{
+	/** For overwriting file if already exists. */
+	writer->data = fopen(filename, "w");
+	if (writer->data == NULL) {
+		return EINVAL;
+	}
+	fclose(writer->data);
+
+	writer->data = fopen(filename, "a");
+	if (writer->data == NULL) {
+		return EINVAL;
+	}
+	pcap_writer_add_header(writer, (uint32_t)PCAP_LINKTYPE_ETHERNET);
+
+	return EOK;
+}
+
+/** Open file for appending to the end of it.
+ *  @param writer 	Interface for writing data.
+ *  @param filename Path to the file.
+ *  @return 		EOK on success, error code otherwise.
+ */
+static errno_t pcap_writer_to_file_init_append(pcap_writer_t *writer, const char *filename)
+{
+	writer->data = fopen(filename, "a");
+	if (writer->data == NULL) {
+		return EINVAL;
+	}
+
+	return EOK;
+}
+
+/** Initialize file for dumping usb packets.
+ *  @param writer 	Interface for writing data.
+ *  @param filename Path to the file.
+ *  @return 		EOK on success, error code otherwise.
+ */
+static errno_t pcap_writer_to_file_usb_init(pcap_writer_t *writer, const char *filename)
+{
+	/** For overwriting file if already exists. */
+	writer->data = fopen(filename, "w");
+	if (writer->data == NULL) {
+		return EINVAL;
+	}
+	fclose(writer->data);
+
+	writer->data = fopen(filename, "a");
+	if (writer->data == NULL) {
+		return EINVAL;
+	}
+	pcap_writer_add_header(writer, (uint32_t)PCAP_LINKTYPE_USB_LINUX_MMAPPED);
+
+	return EOK;
+}
+
+/** Write 4B to the file.
+ *  @param writer 	Interface for writing data.
+ *  @param data 	Bytes to write.
+ *  @return 		Size of successfully witten data.
+ */
+static size_t pcap_file_w32(pcap_writer_t *writer, uint32_t data)
+{
+	return fwrite(&data, 1, 4, (FILE *)writer->data);
+}
+
+/** Write 2B to the file.
+ *  @param writer 	Interface for writing data.
+ *  @param data 	Bytes to write.
+ *  @return 		Size of successfully witten data.
+ */
+static size_t pcap_file_w16(pcap_writer_t *writer, uint16_t data)
+{
+	return fwrite(&data, 1, 2, (FILE *)writer->data);
+}
+
+/** Write block of bytes to the file.
+ *  @param writer 	Interface for writing data.
+ *  @param data 	Bytes to write.
+ *  @param size		Size of block of bytes.
+ *  @return 		Size of successfully witten data.
+ */
+static size_t pcap_file_wbuffer(pcap_writer_t *writer, const void *data, size_t size)
+{
+	assert(writer->data);
+	return fwrite(data, 1, size, (FILE *)writer->data);
+}
+
+/** Close file for writing.
+ *  @param writer 	Interaface for writing data.
+ */
+static void pcap_file_close(pcap_writer_t *writer)
+{
+	fclose((FILE *)writer->data);
+	writer->data = NULL;
+}
+
+/** Write <= 60B of block of bytes.
+ *  @param writer 	Interface for writing data.
+ *  @param data 	Bytes to write.
+ *  @param size		Size of block of bytes.
+ *  @return 		Size of successfully witten data.
+ */
+static size_t pcap_short_file_wbuffer(pcap_writer_t *writer, const void *data, size_t size)
+{
+	return fwrite(data, 1, size < SHORT_OPS_BYTE_COUNT ? size : SHORT_OPS_BYTE_COUNT, (FILE *)writer->data);
+}
+
+/** Standard writer operations for writing data to a newly created file. */
+static const pcap_writer_ops_t file_ops = {
+	.open = &pcap_writer_to_file_init,
+	.write_u32 = &pcap_file_w32,
+	.write_u16 = &pcap_file_w16,
+	.write_buffer = &pcap_file_wbuffer,
+	.close = &pcap_file_close
+};
+
+/** Truncated writer operations. Only first 60 bytes of the packet are written. */
+static const pcap_writer_ops_t short_file_ops = {
+	.open = &pcap_writer_to_file_init,
+	.write_u32 = &pcap_file_w32,
+	.write_u16 = &pcap_file_w16,
+	.write_buffer = &pcap_short_file_wbuffer,
+	.close = &pcap_file_close
+
+};
+
+/** Append writer operations. Instead of creating new file open existing file and append packets. */
+static const pcap_writer_ops_t append_file_ops = {
+	.open = &pcap_writer_to_file_init_append,
+	.write_u32 = &pcap_file_w32,
+	.write_u16 = &pcap_file_w16,
+	.write_buffer = &pcap_file_wbuffer,
+	.close = &pcap_file_close
+};
+
+/** USB writer operations. Writing USB packets to the file. */
+static const pcap_writer_ops_t usb_file_ops = {
+	.open = &pcap_writer_to_file_usb_init,
+	.write_u32 = &pcap_file_w32,
+	.write_u16 = &pcap_file_w16,
+	.write_buffer = &pcap_file_wbuffer,
+	.close = &pcap_file_close
+};
+
+/** Default array of operations. Must be consistens with constants in /uspace/app/pcapctl/main.c */
+static pcap_writer_ops_t ops[4] = { file_ops, short_file_ops, append_file_ops, usb_file_ops };
+
+/** Get number of writer operations in @ref ops */
+int pcap_dumper_get_ops_number(void)
+{
+	return (int)(sizeof(ops) / sizeof(pcap_writer_ops_t));
+}
+
+/** Open destination buffer for writing and set flag for dumping.
+ *  @param dumper	Structure responsible for dumping packets. Part of the driver.
+ *  @param name		Name of the destination buffer to dump packets to.
+ *  @return 		EOK if successful, erro code otherwise.
+ */
+errno_t pcap_dumper_start(pcap_dumper_t *dumper, const char *name)
+{
+	fibril_mutex_lock(&dumper->mutex);
+
+	errno_t rc = dumper->writer.ops->open(&dumper->writer, name);
+	if (rc == EOK) {
+		dumper->to_dump = true;
+	}
+
+	fibril_mutex_unlock(&dumper->mutex);
+	return rc;
+}
+
+/** Set writer options for the writer.
+ *  @param dumper 	Structure responsible for dumping packets. Part of the driver.
+ *  @param index	Index of the writer operations from array @ref ops.
+ *  @return 		EOK if successful, erro code otherwise.
+ */
+errno_t pcap_dumper_set_ops(pcap_dumper_t *dumper, int index)
+{
+	fibril_mutex_lock(&dumper->mutex);
+	dumper->writer.ops = &ops[index];
+	fibril_mutex_unlock(&dumper->mutex);
+	return EOK;
+}
+
+/** Write packet to destination buffer.
+ *  @param dumper	Structure responsible for dumping packets. Part of the driver.
+ *  @param data		Packet data to write.
+ *  @param size		Size of the packet.
+ */
+void pcap_dumper_add_packet(pcap_dumper_t *dumper, const void *data, size_t size)
+{
+	fibril_mutex_lock(&dumper->mutex);
+
+	if (!dumper->to_dump) {
+		fibril_mutex_unlock(&dumper->mutex);
+		return;
+	}
+
+	pcap_writer_add_packet(&dumper->writer, data, size);
+	fibril_mutex_unlock(&dumper->mutex);
+}
+
+/** Close destination buffer for writing and unset flag for dumping.
+ *  @param dumper	Structure responsible for dumping packets. Part of the driver.
+ */
+void pcap_dumper_stop(pcap_dumper_t *dumper)
+{
+	fibril_mutex_lock(&dumper->mutex);
+
+	/** If want to stop, when already stopped, do nothing */
+	if (!dumper->to_dump) {
+		fibril_mutex_unlock(&dumper->mutex);
+		return;
+	}
+	dumper->to_dump = false;
+	dumper->writer.ops->close(&dumper->writer);
+	fibril_mutex_unlock(&dumper->mutex);
+}
+
+/** @}
+ */