faux.msg: Unfinished

faux/msg.h

@@ -0,0 +1,107 @@
+/** @file proto.h
+ *
+ * @brief Library to implement simple network protocol
+ *
+ * CRSP is a protocol to send requests to CRSP server. CRSP server stores
+ * information about CDPs, periodically renews CRLs.
+ *
+ * The CRSP protocol supposes request/answer method. Each request must have an
+ * answer. The CRSP server is synchronous. It means that server will answer
+ * immediately or nearly immediately. It can plans a long-time operations but
+ * it sends answer to client immediately. For example client asks for status
+ * of specified CDP but server has no such CDP in its database. So server will
+ * answer with status something like "has no such CDP yet" immediately but it
+ * schedules the long-time task to get CDP information. Later client can send
+ * the same request but now server already has a status for specified CDP and
+ * answers with correspondent status.
+ *
+ * Each CRSP protocol message (request or answer) has the same structure:
+ *
+ * [ CRSP header ]
+ * [ CRSP first parameter's header ]
+ * [ ... ]
+ * [ CRSP n-th parameter's header ]
+ * [ First parameter's data ]
+ * [ ... ]
+ * [ N-th parameter's data ]
+ *
+ * The length of CRSP message can vary. CRSP header has constant length and
+ * contains total length of whole message and number of parameters. It also
+ * contains magic number, CRSP version number, CRSP command, status and
+ * request ID (to identify request/answer). There are parameter header for each
+ * parameter. Parameter's header contains parameter type and length of
+ * parameter. After parameter headers array the parameter's data follows in
+ * a sequence.
+ */
+
+
+#ifndef _faux_msg_h
+#define _faux_msg_h
+
+#include <stdint.h>
+#include <signal.h>
+#include <faux/faux.h>
+#include <faux/list.h>
+#include <faux/net.h>
+
+typedef struct faux_msg_s faux_msg_t;
+
+
+/** @brief Parameter header
+ */
+typedef struct faux_phdr_s {
+	uint16_t param_type; // Parameter type
+	uint8_t reserved[2];
+	uint32_t param_len; // Length of parameter (not including header)
+} faux_phdr_t;
+
+
+/** @brief Message header
+ */
+typedef struct faux_hdr_s {
+	uint32_t magic; // Magic number
+	uint8_t major; // Major protocol version number
+	uint8_t minor; // Minor protocol version number
+	uint16_t cmd; // Command
+	uint32_t status; // Status
+	uint32_t req_id; // Some abstract ID of request. Identifies request/answer
+	uint32_t param_num; // Number of parameters
+	uint32_t len; // Length of whole message (including header)
+	faux_phdr_t phdr[]; // Parameter headers (unknown length)
+} crsp_hdr_t;
+
+
+// Debug variable. 1 for debug and 0 to switch debug off
+extern int crsp_debug;
+
+C_DECL_BEGIN
+
+// CRSP message functions
+crsp_msg_t *crsp_msg_new(void);
+void crsp_msg_free(crsp_msg_t *crsp_msg);
+void crsp_msg_set_cmd(crsp_msg_t *crsp_msg, crsp_cmd_e cmd);
+crsp_cmd_e crsp_msg_get_cmd(const crsp_msg_t *crsp_msg);
+void crsp_msg_set_status(crsp_msg_t *crsp_msg, crsp_status_e status);
+crsp_status_e crsp_msg_get_status(const crsp_msg_t *crsp_msg);
+void crsp_msg_set_req_id(crsp_msg_t *crsp_msg, uint32_t req_id);
+uint32_t crsp_msg_get_req_id(const crsp_msg_t *crsp_msg);
+uint32_t crsp_msg_get_param_num(const crsp_msg_t *crsp_msg);
+uint32_t crsp_msg_get_len(const crsp_msg_t *crsp_msg);
+ssize_t crsp_msg_add_param(crsp_msg_t *crsp_msg, crsp_param_e type,
+	const void *buf, size_t len);
+faux_list_node_t *crsp_msg_init_param_iter(const crsp_msg_t *crsp_msg);
+crsp_phdr_t *crsp_msg_get_param_each(faux_list_node_t **node,
+	crsp_param_e *param_type, void **param_data, uint32_t *param_len);
+crsp_phdr_t *crsp_msg_get_param_by_index(const crsp_msg_t *crsp_msg, unsigned int index,
+	crsp_param_e *param_type, void **param_data, uint32_t *param_len);
+crsp_phdr_t *crsp_msg_get_param_by_type(const crsp_msg_t *crsp_msg,
+	crsp_param_e param_type, void **param_data, uint32_t *param_len);
+ssize_t crsp_msg_send(crsp_msg_t *crsp_msg, faux_net_t *faux_net);
+crsp_msg_t *crsp_msg_recv(faux_net_t *faux_net, crsp_recv_e *status);
+char *crsp_msg_get_param_cdp_uri(const crsp_msg_t *crsp_msg);
+void crsp_msg_debug(crsp_msg_t *crsp_msg);
+
+C_DECL_END
+
+#endif // _faux_msg_h
+

faux/msg/Makefile.am

@@ -0,0 +1,6 @@
+libfaux_la_SOURCES += \
+	faux/msg/msg.c
+
+#if TESTC
+#libfaux_la_SOURCES += faux/msg/testc_msg.c
+#endif

faux/msg/msg.c

@@ -0,0 +1,827 @@
+/** @file crsp_msg.c
+ * @brief Class represents a single message of CRSP protocol.
+ *
+ * CRSP message consist of main header, a block of parameter headers and then
+ * parameters themselfs. Class stores these data. Additionally class knows
+ * the structure of message and can send and receive messages via socket. It
+ * uses external faux_net_t object to do so. The receive function is necessary
+ * because message has a variable length and message parsing is needed to get
+ * actual length of message. The send function is usefull because class uses
+ * struct iovec array to compose outgoing message so it's not necessary to
+ * assemble message into the single long memory chunk.
+ */
+
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <arpa/inet.h>
+
+#include <faux/faux.h>
+#include <faux/str.h>
+#include <faux/list.h>
+#include <faux/net.h>
+#include <faux/msg.h>
+
+// Global variable to switch debug on/off (1/0)
+int crsp_debug = 0;
+
+
+/** @brief Opaque faux_msg_s structure. */
+struct faux_msg_s {
+	faux_hdr_t *hdr; // Message header
+	faux_list_t *params; // List of parameters
+};
+
+
+/** @brief Allocate memory to store message.
+ *
+ * This static function is needed because new message object can be created
+ * in a different ways. The first way is creating outgoing message manually and
+ * the second way is receiving CRSP message from network. These ways need
+ * different initialization but the same memory allocation.
+ *
+ * @return Allocated but not fully initialized faux_msg_t object
+ * or NULL on error
+ */
+static faux_msg_t *faux_msg_allocate(void)
+{
+	faux_msg_t *msg = NULL;
+
+	msg = faux_zmalloc(sizeof(*msg));
+	assert(msg);
+	if (!msg)
+		return NULL;
+
+	// Init message header
+	msg->hdr = faux_zmalloc(sizeof(*msg->hdr));
+	assert(msg->hdr);
+	if (!msg->hdr) {
+		faux_msg_free(msg);
+		return NULL;
+	}
+
+	msg->params = faux_list_new(
+		FAUX_LIST_UNSORTED, FAUX_LIST_NONUNIQUE, NULL, NULL, faux_free);
+
+	return msg;
+}
+
+
+/** @brief Creates new faux_msg_t object. It's usually outgoing message.
+ *
+ * Function initializes main message header with default values. Usually
+ * only outgoing messages need initialized header.
+ *
+ * @param [in] magic Protocol's magic number.
+ * @param [in] major Protocol's version major number.
+ * @param [in] minor Protocol's version minor number.
+ 
+ * @return Allocated and initilized faux_msg_t object or NULL on error.
+ */
+faux_msg_t *faux_msg_new(uint32_t magic, uint8_t major, uint8_t minor)
+{
+	faux_msg_t *msg = NULL;
+
+	msg = faux_msg_allocate();
+	assert(msg);
+	if (!msg)
+		return NULL;
+
+	// Init
+	msg->hdr->magic = htonl(magic);
+	msg->hdr->major = major;
+	msg->hdr->minor = minor;
+	faux_msg_set_cmd(msg, 0);
+	faux_msg_set_status(msg, 0);
+	faux_msg_set_req_id(msg, 0l);
+	faux_msg_set_param_num(msg, 0l);
+	faux_msg_set_len(msg, sizeof(*msg->hdr));
+
+	return msg;
+}
+
+
+/** @brief Frees allocated message.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ */
+void faux_msg_free(faux_msg_t *msg)
+{
+	if (!msg)
+		return;
+
+	faux_list_free(msg->params);
+	faux_free(msg->hdr);
+	faux_free(msg);
+}
+
+
+/** @brief Sets command code to header.
+ *
+ * See the protocol and header description for possible values.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] cmd Command code (16 bit).
+ */
+void faux_msg_set_cmd(faux_msg_t *msg, uint16_t cmd)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return;
+	msg->hdr->cmd = htons(cmd);
+}
+
+
+/** @brief Gets command code from header.
+ *
+ * See the protocol and header description for possible values.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [out] cmd Command code.
+ * @return 0 - success, < 0 - fail
+ */
+int faux_msg_get_cmd(const faux_msg_t *msg, uint16_t *cmd)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (cmd)
+		*cmd = ntohs(msg->hdr->cmd);
+
+	return 0;
+}
+
+
+/** @brief Sets message status to header.
+ *
+ * See the protocol and header description for possible values.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] status Message status.
+ */
+void faux_msg_set_status(faux_msg_t *msg, uint32_t status)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return;
+	msg->hdr->status = htonl(status);
+}
+
+
+/** @brief Gets message status from header.
+ *
+ * See the protocol and header description for possible values.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [out] status Message status.
+ * @return 0 - success, < 0 -fail
+ */
+int faux_msg_get_status(const faux_msg_t *msg, uint32_t *status)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (status)
+		*status = ntohl(msg->hdr->status);
+
+	return 0;
+}
+
+
+/** @brief Sets request ID to header.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] req_id Request ID.
+ */
+void faux_msg_set_req_id(faux_msg_t *msg, uint32_t req_id)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return;
+	msg->hdr->req_id = htonl(req_id);
+}
+
+
+/** @brief Gets request ID from header.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [out] req_id Request ID.
+ * @return 0 - success, < 0 - fail
+ */
+int faux_msg_get_req_id(const faux_msg_t *msg, uint32_t *req_id)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (req_id)
+		*req_id = ntohl(msg->hdr->req_id);
+
+	return 0;
+}
+
+
+/** @brief Sets number of parameters to header.
+ *
+ * It's a static function because external user can add or remove parameters
+ * but class calculates total number of parameters internally.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] param_num Number of parameters.
+ */
+static void faux_msg_set_param_num(faux_msg_t *msg, uint32_t param_num)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return;
+	msg->hdr->param_num = htonl(param_num);
+}
+
+
+/** @brief Gets number of parameters from header.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @return Number of parameters.
+ */
+int faux_msg_get_param_num(const faux_msg_t *msg, uint32_t *param_num)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (param_num)
+		*param_num = ntohl(msg->hdr->param_num);
+
+	return 0;
+}
+
+
+/** @brief Sets total length of message to header.
+ *
+ * It's a static function because external user can add or remove parameters
+ * but class calculates total length of message internally.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] len Total length of message.
+ */
+static void faux_msg_set_len(faux_msg_t *msg, uint32_t len)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return;
+	msg->hdr->len = htonl(len);
+}
+
+
+/** @brief Gets total length of message from header.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [out] len Total length of message.
+ * @return 0 - success, < 0 - fail
+ */
+int faux_msg_get_len(const faux_msg_t *msg, uint32_t *len)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (len)
+		*len = ntohl(msg->hdr->len);
+
+	return 0;
+}
+
+
+/** @brief Gets magic number from header.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [out] magic Magic number.
+ * @return 0 - success, < 0 - fail
+ */
+int faux_msg_get_magic(const faux_msg_t *msg, uint32_t *magic)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (magic)
+		*magic = ntohl(msg->hdr->magic);
+
+	return 0;
+}
+
+
+/** @brief Gets version from header.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [out] major Major version number.
+ * @param [out] minor Minor version number.
+ * @return 0 - success, < 0 - fail
+ */
+int faux_msg_get_version(const faux_msg_t *msg, uint8_t *major, uint8_t *minor)
+{
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+	if (major)
+		*major = msg->hdr->major;
+	if (minor)
+		*minor = msg->hdr->minor;
+
+	return 0;
+}
+
+
+/** @brief Internal function to add message parameter
+ *
+ * Internal function can update or don't update number of parameters and
+ * whole length within message header. It can be used while
+ * message receive to don't break already calculated header
+ * values. So when user is constructing message the values must be updated.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] type Type of parameter.
+ * @param [in] buf Parameter's data buffer.
+ * @param [in] len Parameter's data length.
+ * @param [in] upadte_len Flag that says to update or don't update number of
+ * parameters and total message length within header. BOOL_TRUE - update,
+ * BOOL_FALSE - don't update.
+ * @return Length of parameter's data or < 0 on error.
+ */
+static ssize_t faux_msg_add_param_internal(faux_msg_t *msg,
+	uint16_t type, const void *buf, size_t len, bool_t update_len)
+{
+	faux_phdr_t *phdr = NULL;
+	char *param = NULL;
+
+	assert(msg);
+	assert(msg->hdr);
+	if (!msg || !msg->hdr)
+		return -1;
+
+	// Allocate parameter header and data
+	param = faux_zmalloc(sizeof(*phdr) + len);
+	assert(param);
+	if (!param)
+		return -1;
+	// Init param hdr
+	phdr = (faux_phdr_t *)param;
+	phdr->param_type = htonl(type);
+	phdr->param_len = htonl(len);
+	// Copy data
+	memcpy(param + sizeof(*phdr), buf, len);
+
+	if (update_len) {
+		uint32_t cur_param_num = 0;
+		uint32_t cur_len = 0;
+
+		// Update number of parameters
+		faux_msg_get_param_num(msg, &cur_param_num);
+		faux_msg_set_param_num(msg, cur_param_num + 1);
+
+		// Update whole message length
+		faux_msg_get_len(msg, &cur_len);
+		crsp_msg_set_len(crsp_msg, cur_len + sizeof(*phdr) + len);
+	}
+
+	// Add to parameter list
+	faux_list_add(msg->params, param);
+
+	return len;
+}
+
+
+/** @brief Adds parameter to message.
+ *
+ * @param [in] msg Allocated faux_msg_t object.
+ * @param [in] type Type of parameter.
+ * @param [in] buf Parameter's data buffer.
+ * @param [in] len Parameter's data length.
+ * @return Length of parameter's data or < 0 on error.
+ */
+ssize_t faux_msg_add_param(faux_msg_t *msg, uint16_t type,
+	const void *buf, size_t len)
+{
+	return faux_msg_add_param_internal(msg, type, buf, len, BOOL_TRUE);
+}
+
+
+/** @brief Initializes iterator to iterate through the message parameters.
+ *
+ * The iterator must be initialized before iteration.
+ *
+ * @param [in] crsp_msg Allocated crsp_msg_t object.
+ * @return Initialized iterator.
+ */
+faux_list_node_t *crsp_msg_init_param_iter(const crsp_msg_t *crsp_msg)
+{
+	assert(crsp_msg);
+	assert(crsp_msg->params);
+	if (!crsp_msg || !crsp_msg->params)
+		return NULL;
+
+	return faux_list_head(crsp_msg->params);
+}
+
+
+/** @brief Internal function to get parameter's data by node (faux_list_node_t).
+ *
+ * Note function returns the main data by output arguments.
+ *
+ * @param [in] node Node from the parameter's list.
+ * @param [out] param_type Type of parameter. See the crsp_param_e enumeration.
+ * @param [out] param_buf Parameter's data buffer.
+ * @param [out] param_len Parameter's data length.
+ * @return Pointer to parameter's header or NULL on error.
+ */
+static crsp_phdr_t *crsp_msg_get_param_by_node(const faux_list_node_t *node,
+	crsp_param_e *param_type, void **param_data, uint32_t *param_len)
+{
+	char *param = NULL;
+	crsp_phdr_t *phdr = NULL;
+	char *data = NULL;
+
+	if (!node)
+		return NULL;
+
+	param = faux_list_data(node);
+	phdr = (crsp_phdr_t *)param;
+	data = param + sizeof(*phdr);
+
+	if (param_type)
+		*param_type = phdr->param_type;
+	if (param_data)
+		*param_data = data;
+	if (param_len)
+		*param_len = ntohl(phdr->param_len);
+
+	return phdr;
+}
+
+
+/** @brief Iterate through the message parameters.
+ *
+ * First parameter (iterator/node) must be initialized first by
+ * crsp_msg_init_param_iter().
+ *
+ * @param [in] node Initialized iterator of parameter list.
+ * @param [out] param_type Type of parameter. See the crsp_param_e enumeration.
+ * @param [out] param_buf Parameter's data buffer.
+ * @param [out] param_len Parameter's data length.
+ * @return Pointer to parameter's header or NULL on error.
+ */
+crsp_phdr_t *crsp_msg_get_param_each(faux_list_node_t **node,
+	crsp_param_e *param_type, void **param_data, uint32_t *param_len)
+{
+	faux_list_node_t *current_node = NULL;
+
+	if (!node || !*node)
+		return NULL;
+
+	current_node = *node;
+	*node = faux_list_next_node(current_node);
+
+	return crsp_msg_get_param_by_node(current_node,
+		param_type, param_data, param_len);
+}
+
+
+/** @brief Gets message parameter by the index.
+ *
+ * @param [in] crsp_msg Allocated crsp_msg_t object.
+ * @param [in] index Parameter's index.
+ * @param [out] param_type Type of parameter. See the crsp_param_e enumeration.
+ * @param [out] param_buf Parameter's data buffer.
+ * @param [out] param_len Parameter's data length.
+ * @return Pointer to parameter's header or NULL on error.
+ */
+crsp_phdr_t *crsp_msg_get_param_by_index(const crsp_msg_t *crsp_msg, unsigned int index,
+	crsp_param_e *param_type, void **param_data, uint32_t *param_len)
+{
+	faux_list_node_t *iter = NULL;
+	unsigned int i = 0;
+
+	assert(crsp_msg);
+	assert(crsp_msg->hdr);
+	if (!crsp_msg || !crsp_msg->hdr)
+		return NULL;
+	if (index >= crsp_msg_get_param_num(crsp_msg)) // Non-existent entry
+		return NULL;
+
+	iter = crsp_msg_init_param_iter(crsp_msg);
+	while ((i != index) && iter) {
+		i++;
+		iter = faux_list_next_node(iter);
+	}
+
+	return crsp_msg_get_param_by_node(iter,
+		param_type, param_data, param_len);
+}
+
+
+/** @brief Gets message parameter by parameter's type.
+ *
+ * @param [in] crsp_msg Allocated crsp_msg_t object.
+ * @param [in] param_type Type of parameter. See the crsp_param_e enumeration.
+ * @param [out] param_buf Parameter's data buffer.
+ * @param [out] param_len Parameter's data length.
+ * @return Pointer to parameter's header or NULL on error.
+ */
+crsp_phdr_t *crsp_msg_get_param_by_type(const crsp_msg_t *crsp_msg,
+	crsp_param_e param_type, void **param_data, uint32_t *param_len)
+{
+	faux_list_node_t *iter = NULL;
+
+	assert(crsp_msg);
+	assert(crsp_msg->hdr);
+	if (!crsp_msg || !crsp_msg->hdr)
+		return NULL;
+
+	for (iter = crsp_msg_init_param_iter(crsp_msg);
+		iter; iter = faux_list_next_node(iter)) {
+		crsp_phdr_t *phdr = NULL;
+		phdr = (crsp_phdr_t *)faux_list_data(iter);
+		if (phdr->param_type == param_type)
+			return crsp_msg_get_param_by_node(iter,
+				NULL, param_data, param_len);
+	}
+
+	// Not found
+	return NULL;
+}
+
+
+/** @brief Sends CRSP message to network.
+ *
+ * Function sends message to network using preinitialized faux_net_t object.
+ * User can specify timeout, signal mask, etc while faux_net_t object creation.
+ *
+ * Function can return length less than whole message length in the following
+ * cases:
+ * - An error has occured like broken file descriptor.
+ * - Interrupted by allowed signal (see signal mask).
+ * - Timeout.
+ *
+ * @param [in] crsp_msg Allocated crsp_msg_t object.
+ * @param [in] faux_net Preinitialized faux_net_t object.
+ * @return Length of sent data or < 0 on error.
+ */
+ssize_t crsp_msg_send(crsp_msg_t *crsp_msg, faux_net_t *faux_net)
+{
+	unsigned int vec_entries_num = 0;
+	struct iovec *iov = NULL;
+	unsigned int i = 0;
+	faux_list_node_t *iter = NULL;
+	size_t ret = 0;
+
+	assert(crsp_msg);
+	assert(crsp_msg->hdr);
+	if (!crsp_msg || !crsp_msg->hdr)
+		return -1;
+
+	// Calculate number if struct iovec entries.
+	// n = (msg header) + ((param hdr) + (param data)) * (param_num)
+	vec_entries_num = 1 + (2 * crsp_msg_get_param_num(crsp_msg));
+	iov = faux_zmalloc(vec_entries_num * sizeof(*iov));
+
+	// Message header
+	iov[i].iov_base = crsp_msg->hdr;
+	iov[i].iov_len = sizeof(*crsp_msg->hdr);
+	i++;
+
+	// Parameter headers
+	for (iter = crsp_msg_init_param_iter(crsp_msg);
+		iter; iter = faux_list_next_node(iter)) {
+		crsp_phdr_t *phdr = NULL;
+		phdr = (crsp_phdr_t *)faux_list_data(iter);
+		iov[i].iov_base = phdr;
+		iov[i].iov_len = sizeof(*phdr);
+		i++;
+	}
+
+	// Parameter data
+	for (iter = crsp_msg_init_param_iter(crsp_msg);
+		iter; iter = faux_list_next_node(iter)) {
+		crsp_phdr_t *phdr = NULL;
+		void *data = NULL;
+		phdr = (crsp_phdr_t *)faux_list_data(iter);
+		data = (char *)phdr + sizeof(*phdr);
+		iov[i].iov_base = data;
+		iov[i].iov_len = ntohl(phdr->param_len);
+		i++;
+	}
+
+	ret = faux_net_sendv(faux_net, iov, vec_entries_num);
+	faux_free(iov);
+
+	// Debug
+	if (crsp_msg && ret > 0 && crsp_debug) {
+		printf("(o) ");
+		crsp_msg_debug(crsp_msg);
+	}
+
+	return ret;
+}
+
+
+/** @brief Receives full CRSP message and allocates crsp_msg_t object for it.
+ *
+ * Function receives message from network using preinitialized faux_net_t object.
+ * User can specify timeout, signal mask, etc while faux_net_t object creation.
+ *
+ * Function can return length less than whole message length in the following
+ * cases:
+ * - An error has occured like broken file descriptor.
+ * - Interrupted by allowed signal (see signal mask).
+ * - Timeout.
+ *
+ * It can be an logical errors while message receiving like wrong protocol
+ * version. So function has additional parameter named 'status'. It will
+ * be CRSP_STATUS_OK in a case when all is ok but function can return NULL and
+ * set appropriate status to this parameter. It can be
+ * CRSP_STATUS_WRONG_VERSION for example. The function will return NULL
+ * and CRSP_STATUS_OK on some system errors like illegal parameters or
+ * insufficient of memory.
+ *
+ * @param [in] faux_net Preinitialized faux_net_t object.
+ * @param [out] status Status while message receiving. Can be NULL.
+ * @return Allocated crsp_msg_t object. Object contains received message.
+ */
+crsp_msg_t *crsp_msg_recv(faux_net_t *faux_net, crsp_recv_e *status)
+{
+	crsp_msg_t *crsp_msg = NULL;
+	size_t received = 0;
+	crsp_phdr_t *phdr = NULL;
+	unsigned int param_num = 0;
+	size_t phdr_whole_len = 0;
+	size_t max_data_len = 0;
+	size_t cur_data_len = 0;
+	unsigned int i = 0;
+	char *data = NULL;
+
+	if (status)
+		*status = CRSP_RECV_OK;
+	crsp_msg = crsp_msg_allocate();
+	assert(crsp_msg);
+	if (!crsp_msg)
+		return NULL;
+
+	// Receive message header
+	received = faux_net_recv(faux_net,
+		crsp_msg->hdr, sizeof(*crsp_msg->hdr));
+	if (received != sizeof(*crsp_msg->hdr)) {
+		crsp_msg_free(crsp_msg);
+		return NULL;
+	}
+	if (!crsp_msg_check_hdr(crsp_msg, status)) {
+		crsp_msg_free(crsp_msg);
+		return NULL;
+	}
+
+	// Receive parameter headers
+	param_num = crsp_msg_get_param_num(crsp_msg);
+	if (param_num != 0) {
+		phdr_whole_len = param_num * sizeof(*phdr);
+		phdr = faux_zmalloc(phdr_whole_len);
+		received = faux_net_recv(faux_net, phdr, phdr_whole_len);
+		if (received != phdr_whole_len) {
+			faux_free(phdr);
+			crsp_msg_free(crsp_msg);
+			if (status)
+				*status = CRSP_RECV_BROKEN_PARAM;
+			return NULL;
+		}
+		// Find out maximum data length
+		for (i = 0; i < param_num; i++) {
+			cur_data_len = ntohl(phdr[i].param_len);
+			if (cur_data_len > max_data_len)
+				max_data_len = cur_data_len;
+		}
+
+		// Receive parameter data
+		data = faux_zmalloc(max_data_len);
+		for (i = 0; i < param_num; i++) {
+			cur_data_len = ntohl(phdr[i].param_len);
+			if (0 == cur_data_len)
+				continue;
+			received = faux_net_recv(faux_net,
+				data, cur_data_len);
+			if (received != cur_data_len) {
+				faux_free(data);
+				faux_free(phdr);
+				crsp_msg_free(crsp_msg);
+				if (status)
+					*status = CRSP_RECV_BROKEN_PARAM;
+				return NULL;
+			}
+			crsp_msg_add_param_internal(crsp_msg, phdr[i].param_type,
+				data, cur_data_len, BOOL_FALSE);
+		}
+
+		faux_free(data);
+		faux_free(phdr);
+	}
+
+	// Debug
+	if (crsp_msg && crsp_debug) {
+		printf("(i) ");
+		crsp_msg_debug(crsp_msg);
+	}
+
+	return crsp_msg;
+}
+
+
+/** @brief Gets CRSP_PARAM_CDP_URI parameter from message.
+ *
+ * Protocol helper.
+ *
+ * @param [in] crsp_msg Allocated crsp_msg_t object.
+ * @return Allocated C-string or NULL on error. Must be freed by faux_str_free().
+ */
+char *crsp_msg_get_param_cdp_uri(const crsp_msg_t *crsp_msg)
+{
+	char *req_uri = NULL;
+	uint32_t req_uri_len = 0;
+
+	if (!crsp_msg_get_param_by_type(crsp_msg, CRSP_PARAM_CDP_URI,
+		(void **)&req_uri, &req_uri_len))
+		return NULL;
+
+	if (0 == req_uri_len)
+		return NULL;
+
+	return faux_str_dupn(req_uri, req_uri_len);
+}
+
+
+/** @brief Print CRSP message debug info.
+ *
+ * Function prints header values and parameters.
+ *
+ * @param [in] crsp_msg Allocated crsp_msg_t object.
+ */
+void crsp_msg_debug(crsp_msg_t *crsp_msg)
+#ifdef DEBUG
+{
+	faux_list_node_t *iter = 0;
+	crsp_param_e param_type = CRSP_PARAM_NULL;
+	void *param_data = NULL;
+	uint32_t param_len = 0;
+
+	assert(crsp_msg);
+	if (!crsp_msg)
+		return;
+
+	// Header
+	printf("%c%c%c%c(%u.%u): %c%c %u %u %u |%lub\n",
+		((char *)crsp_msg->hdr)[0],
+		((char *)crsp_msg->hdr)[1],
+		((char *)crsp_msg->hdr)[2],
+		((char *)crsp_msg->hdr)[3],
+		crsp_msg->hdr->major,
+		crsp_msg->hdr->minor,
+		crsp_msg_get_cmd(crsp_msg) != CRSP_CMD_NULL ? crsp_msg_get_cmd(crsp_msg) : '_',
+		crsp_msg_get_status(crsp_msg) != CRSP_STATUS_NULL ? crsp_msg_get_status(crsp_msg) : '_',
+		crsp_msg_get_req_id(crsp_msg),
+		crsp_msg_get_param_num(crsp_msg),
+		crsp_msg_get_len(crsp_msg),
+		sizeof(*crsp_msg->hdr)
+		);
+
+	// Parameters
+	iter = crsp_msg_init_param_iter(crsp_msg);
+	while (crsp_msg_get_param_each(&iter, &param_type, &param_data, &param_len)) {
+		printf("  %c %u [", param_type, param_len);
+		if ((CRSP_PARAM_CDP_URI == param_type) ||
+			(CRSP_PARAM_CRL_FILENAME == param_type)) {
+			fwrite(param_data, param_len, 1, stdout);
+		} else {
+			printf("...");
+		}
+		printf("] |%lub\n", sizeof(crsp_phdr_t) + param_len);
+	}
+}
+#else
+{
+	crsp_msg = crsp_msg; // Happy compiler
+}
+#endif