libhydra: Move all kernel plugins to libcharon

1 files changed, 0 insertions, 655 deletions

diff --git a/src/libhydra/plugins/kernel_netlink/kernel_netlink_shared.c b/src/libhydra/plugins/kernel_netlink/kernel_netlink_shared.c
deleted file mode 100644
index f7ce992a3..000000000
--- a/src/libhydra/plugins/kernel_netlink/kernel_netlink_shared.c
+++ /dev/null
@@ -1,655 +0,0 @@
-/*
- * Copyright (C) 2014 Martin Willi
- * Copyright (C) 2014 revosec AG
- * Copyright (C) 2008 Tobias Brunner
- * Hochschule fuer Technik Rapperswil
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * for more details.
- */
-
-#include <sys/socket.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <linux/xfrm.h>
-#include <errno.h>
-#include <unistd.h>
-
-#include "kernel_netlink_shared.h"
-
-#include <utils/debug.h>
-#include <threading/mutex.h>
-#include <threading/condvar.h>
-#include <collections/array.h>
-#include <collections/hashtable.h>
-
-typedef struct private_netlink_socket_t private_netlink_socket_t;
-
-/**
- * Private variables and functions of netlink_socket_t class.
- */
-struct private_netlink_socket_t {
-
-	/**
-	 * public part of the netlink_socket_t object.
-	 */
-	netlink_socket_t public;
-
-	/**
-	 * mutex to lock access entries
-	 */
-	mutex_t *mutex;
-
-	/**
-	 * Netlink request entries currently active, uintptr_t seq => entry_t
-	 */
-	hashtable_t *entries;
-
-	/**
-	 * Current sequence number for Netlink requests
-	 */
-	refcount_t seq;
-
-	/**
-	 * netlink socket
-	 */
-	int socket;
-
-	/**
-	 * Netlink protocol
-	 */
-	int protocol;
-
-	/**
-	 * Enum names for Netlink messages
-	 */
-	enum_name_t *names;
-
-	/**
-	 * Timeout for Netlink replies, in ms
-	 */
-	u_int timeout;
-
-	/**
-	 * Number of times to repeat timed out queries
-	 */
-	u_int retries;
-
-	/**
-	 * Buffer size for received Netlink messages
-	 */
-	u_int buflen;
-
-	/**
-	 * Use parallel netlink queries
-	 */
-	bool parallel;
-
-	/**
-	 * Ignore errors potentially resulting from a retransmission
-	 */
-	bool ignore_retransmit_errors;
-};
-
-/**
- * #definable hook to simulate request message loss
- */
-#ifdef NETLINK_MSG_LOSS_HOOK
-bool NETLINK_MSG_LOSS_HOOK(struct nlmsghdr *msg);
-#define msg_loss_hook(msg) NETLINK_MSG_LOSS_HOOK(msg)
-#else
-#define msg_loss_hook(msg) FALSE
-#endif
-
-/**
- * Request entry the answer for a waiting thread is collected in
- */
-typedef struct {
-	/** Condition variable thread is waiting */
-	condvar_t *condvar;
-	/** Array of hdrs in a multi-message response, as struct nlmsghdr* */
-	array_t *hdrs;
-	/** All response messages received? */
-	bool complete;
-} entry_t;
-
-/**
- * Clean up a thread waiting entry
- */
-static void destroy_entry(entry_t *entry)
-{
-	entry->condvar->destroy(entry->condvar);
-	array_destroy_function(entry->hdrs, (void*)free, NULL);
-	free(entry);
-}
-
-/**
- * Write a Netlink message to socket
- */
-static bool write_msg(private_netlink_socket_t *this, struct nlmsghdr *msg)
-{
-	struct sockaddr_nl addr = {
-		.nl_family = AF_NETLINK,
-	};
-	int len;
-
-	if (msg_loss_hook(msg))
-	{
-		return TRUE;
-	}
-
-	while (TRUE)
-	{
-		len = sendto(this->socket, msg, msg->nlmsg_len, 0,
-					 (struct sockaddr*)&addr, sizeof(addr));
-		if (len != msg->nlmsg_len)
-		{
-			if (errno == EINTR)
-			{
-				continue;
-			}
-			DBG1(DBG_KNL, "netlink write error: %s", strerror(errno));
-			return FALSE;
-		}
-		return TRUE;
-	}
-}
-
-/**
- * Read a single Netlink message from socket, return 0 on error, -1 on timeout
- */
-static ssize_t read_msg(private_netlink_socket_t *this,
-						char *buf, size_t buflen, bool block)
-{
-	ssize_t len;
-
-	if (block)
-	{
-		fd_set set;
-		timeval_t tv = {};
-
-		FD_ZERO(&set);
-		FD_SET(this->socket, &set);
-		timeval_add_ms(&tv, this->timeout);
-
-		if (select(this->socket + 1, &set, NULL, NULL,
-				   this->timeout ? &tv : NULL) <= 0)
-		{
-			return -1;
-		}
-	}
-	len = recv(this->socket, buf, buflen, MSG_TRUNC|(block ? 0 : MSG_DONTWAIT));
-	if (len > buflen)
-	{
-		DBG1(DBG_KNL, "netlink response exceeds buffer size");
-		return 0;
-	}
-	if (len < 0)
-	{
-		if (errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR)
-		{
-			DBG1(DBG_KNL, "netlink read error: %s", strerror(errno));
-		}
-		return 0;
-	}
-	return len;
-}
-
-/**
- * Queue received response message
- */
-static bool queue(private_netlink_socket_t *this, struct nlmsghdr *buf)
-{
-	struct nlmsghdr *hdr;
-	entry_t *entry;
-	uintptr_t seq;
-
-	seq = (uintptr_t)buf->nlmsg_seq;
-
-	this->mutex->lock(this->mutex);
-	entry = this->entries->get(this->entries, (void*)seq);
-	if (entry)
-	{
-		hdr = malloc(buf->nlmsg_len);
-		memcpy(hdr, buf, buf->nlmsg_len);
-		array_insert(entry->hdrs, ARRAY_TAIL, hdr);
-		if (hdr->nlmsg_type == NLMSG_DONE || !(hdr->nlmsg_flags & NLM_F_MULTI))
-		{
-			entry->complete = TRUE;
-			entry->condvar->signal(entry->condvar);
-		}
-	}
-	else
-	{
-		DBG1(DBG_KNL, "received unknown netlink seq %u, ignored", seq);
-	}
-	this->mutex->unlock(this->mutex);
-
-	return entry != NULL;
-}
-
-/**
- * Read and queue response message, optionally blocking, returns TRUE on timeout
- */
-static bool read_and_queue(private_netlink_socket_t *this, bool block)
-{
-	struct nlmsghdr *hdr;
-	char buf[this->buflen];
-	ssize_t len;
-
-	len = read_msg(this, buf, sizeof(buf), block);
-	if (len == -1)
-	{
-		return TRUE;
-	}
-	if (len)
-	{
-		hdr = (struct nlmsghdr*)buf;
-		while (NLMSG_OK(hdr, len))
-		{
-			if (!queue(this, hdr))
-			{
-				break;
-			}
-			hdr = NLMSG_NEXT(hdr, len);
-		}
-	}
-	return FALSE;
-}
-
-CALLBACK(watch, bool,
-	private_netlink_socket_t *this, int fd, watcher_event_t event)
-{
-	if (event == WATCHER_READ)
-	{
-		read_and_queue(this, FALSE);
-	}
-	return TRUE;
-}
-
-/**
- * Send a netlink request, try once
- */
-static status_t send_once(private_netlink_socket_t *this, struct nlmsghdr *in,
-						  uintptr_t seq, struct nlmsghdr **out, size_t *out_len)
-{
-	struct nlmsghdr *hdr;
-	chunk_t result = {};
-	entry_t *entry;
-
-	in->nlmsg_seq = seq;
-	in->nlmsg_pid = getpid();
-
-	if (this->names)
-	{
-		DBG3(DBG_KNL, "sending %N %u: %b", this->names, in->nlmsg_type,
-			 (u_int)seq, in, in->nlmsg_len);
-	}
-
-	this->mutex->lock(this->mutex);
-	if (!write_msg(this, in))
-	{
-		this->mutex->unlock(this->mutex);
-		return FAILED;
-	}
-
-	INIT(entry,
-		.condvar = condvar_create(CONDVAR_TYPE_DEFAULT),
-		.hdrs = array_create(0, 0),
-	);
-	this->entries->put(this->entries, (void*)seq, entry);
-
-	while (!entry->complete)
-	{
-		if (this->parallel &&
-			lib->watcher->get_state(lib->watcher) == WATCHER_RUNNING)
-		{
-			if (this->timeout)
-			{
-				if (entry->condvar->timed_wait(entry->condvar, this->mutex,
-											   this->timeout))
-				{
-					break;
-				}
-			}
-			else
-			{
-				entry->condvar->wait(entry->condvar, this->mutex);
-			}
-		}
-		else
-		{	/* During (de-)initialization, no watcher thread is active.
-			 * collect responses ourselves. */
-			if (read_and_queue(this, TRUE))
-			{
-				break;
-			}
-		}
-	}
-	this->entries->remove(this->entries, (void*)seq);
-
-	this->mutex->unlock(this->mutex);
-
-	if (!entry->complete)
-	{	/* timeout */
-		destroy_entry(entry);
-		return OUT_OF_RES;
-	}
-
-	while (array_remove(entry->hdrs, ARRAY_HEAD, &hdr))
-	{
-		if (this->names)
-		{
-			DBG3(DBG_KNL, "received %N %u: %b", this->names, hdr->nlmsg_type,
-				 hdr->nlmsg_seq, hdr, hdr->nlmsg_len);
-		}
-		result = chunk_cat("mm", result,
-						   chunk_create((char*)hdr, hdr->nlmsg_len));
-	}
-	destroy_entry(entry);
-
-	*out_len = result.len;
-	*out = (struct nlmsghdr*)result.ptr;
-
-	return SUCCESS;
-}
-
-/**
- * Ignore errors for message types that might have completed previously
- */
-static void ignore_retransmit_error(private_netlink_socket_t *this,
-									struct nlmsgerr *err, int type)
-{
-	switch (err->error)
-	{
-		case -EEXIST:
-			switch (this->protocol)
-			{
-				case NETLINK_XFRM:
-					switch (type)
-					{
-						case XFRM_MSG_NEWPOLICY:
-						case XFRM_MSG_NEWSA:
-							err->error = 0;
-							break;
-					}
-					break;
-				case NETLINK_ROUTE:
-					switch (type)
-					{
-						case RTM_NEWADDR:
-						case RTM_NEWLINK:
-						case RTM_NEWNEIGH:
-						case RTM_NEWROUTE:
-						case RTM_NEWRULE:
-							err->error = 0;
-							break;
-					}
-					break;
-			}
-			break;
-		case -ENOENT:
-			switch (this->protocol)
-			{
-				case NETLINK_XFRM:
-					switch (type)
-					{
-						case XFRM_MSG_DELPOLICY:
-						case XFRM_MSG_DELSA:
-							err->error = 0;
-							break;
-					}
-					break;
-				case NETLINK_ROUTE:
-					switch (type)
-					{
-						case RTM_DELADDR:
-						case RTM_DELLINK:
-						case RTM_DELNEIGH:
-						case RTM_DELROUTE:
-						case RTM_DELRULE:
-							err->error = 0;
-							break;
-					}
-					break;
-			}
-			break;
-	}
-}
-
-METHOD(netlink_socket_t, netlink_send, status_t,
-	private_netlink_socket_t *this, struct nlmsghdr *in, struct nlmsghdr **out,
-	size_t *out_len)
-{
-	uintptr_t seq;
-	u_int try;
-
-	seq = ref_get(&this->seq);
-
-	for (try = 0; try <= this->retries; ++try)
-	{
-		struct nlmsghdr *hdr;
-		status_t status;
-		size_t len;
-
-		if (try > 0)
-		{
-			DBG1(DBG_KNL, "retransmitting Netlink request (%u/%u)",
-				 try, this->retries);
-		}
-		status = send_once(this, in, seq, &hdr, &len);
-		switch (status)
-		{
-			case SUCCESS:
-				break;
-			case OUT_OF_RES:
-				continue;
-			default:
-				return status;
-		}
-		if (hdr->nlmsg_type == NLMSG_ERROR)
-		{
-			struct nlmsgerr* err;
-
-			err = NLMSG_DATA(hdr);
-			if (err->error == -EBUSY)
-			{
-				free(hdr);
-				try--;
-				continue;
-			}
-			if (this->ignore_retransmit_errors && try > 0)
-			{
-				ignore_retransmit_error(this, err, in->nlmsg_type);
-			}
-		}
-		*out = hdr;
-		*out_len = len;
-		return SUCCESS;
-	}
-	DBG1(DBG_KNL, "Netlink request timed out after %u retransmits",
-		 this->retries);
-	return OUT_OF_RES;
-}
-
-METHOD(netlink_socket_t, netlink_send_ack, status_t,
-	private_netlink_socket_t *this, struct nlmsghdr *in)
-{
-	struct nlmsghdr *out, *hdr;
-	size_t len;
-
-	if (netlink_send(this, in, &out, &len) != SUCCESS)
-	{
-		return FAILED;
-	}
-	hdr = out;
-	while (NLMSG_OK(hdr, len))
-	{
-		switch (hdr->nlmsg_type)
-		{
-			case NLMSG_ERROR:
-			{
-				struct nlmsgerr* err = NLMSG_DATA(hdr);
-
-				if (err->error)
-				{
-					if (-err->error == EEXIST)
-					{	/* do not report existing routes */
-						free(out);
-						return ALREADY_DONE;
-					}
-					if (-err->error == ESRCH)
-					{	/* do not report missing entries */
-						free(out);
-						return NOT_FOUND;
-					}
-					DBG1(DBG_KNL, "received netlink error: %s (%d)",
-						 strerror(-err->error), -err->error);
-					free(out);
-					return FAILED;
-				}
-				free(out);
-				return SUCCESS;
-			}
-			default:
-				hdr = NLMSG_NEXT(hdr, len);
-				continue;
-			case NLMSG_DONE:
-				break;
-		}
-		break;
-	}
-	DBG1(DBG_KNL, "netlink request not acknowledged");
-	free(out);
-	return FAILED;
-}
-
-METHOD(netlink_socket_t, destroy, void,
-	private_netlink_socket_t *this)
-{
-	if (this->socket != -1)
-	{
-		if (this->parallel)
-		{
-			lib->watcher->remove(lib->watcher, this->socket);
-		}
-		close(this->socket);
-	}
-	this->entries->destroy(this->entries);
-	this->mutex->destroy(this->mutex);
-	free(this);
-}
-
-/**
- * Described in header.
- */
-netlink_socket_t *netlink_socket_create(int protocol, enum_name_t *names,
-										bool parallel)
-{
-	private_netlink_socket_t *this;
-	struct sockaddr_nl addr = {
-		.nl_family = AF_NETLINK,
-	};
-
-	INIT(this,
-		.public = {
-			.send = _netlink_send,
-			.send_ack = _netlink_send_ack,
-			.destroy = _destroy,
-		},
-		.seq = 200,
-		.mutex = mutex_create(MUTEX_TYPE_RECURSIVE),
-		.socket = socket(AF_NETLINK, SOCK_RAW, protocol),
-		.entries = hashtable_create(hashtable_hash_ptr, hashtable_equals_ptr, 4),
-		.protocol = protocol,
-		.names = names,
-		.buflen = lib->settings->get_int(lib->settings,
-							"%s.plugins.kernel-netlink.buflen", 0, lib->ns),
-		.timeout = lib->settings->get_int(lib->settings,
-							"%s.plugins.kernel-netlink.timeout", 0, lib->ns),
-		.retries = lib->settings->get_int(lib->settings,
-							"%s.plugins.kernel-netlink.retries", 0, lib->ns),
-		.ignore_retransmit_errors = lib->settings->get_bool(lib->settings,
-							"%s.plugins.kernel-netlink.ignore_retransmit_errors",
-							FALSE, lib->ns),
-		.parallel = parallel,
-	);
-
-	if (!this->buflen)
-	{
-		long pagesize = sysconf(_SC_PAGESIZE);
-		if (pagesize == -1)
-		{
-			pagesize = 4096;
-		}
-		/* base this on NLMSG_GOODSIZE */
-		this->buflen = min(pagesize, 8192);
-	}
-	if (this->socket == -1)
-	{
-		DBG1(DBG_KNL, "unable to create netlink socket");
-		destroy(this);
-		return NULL;
-	}
-	if (bind(this->socket, (struct sockaddr*)&addr, sizeof(addr)))
-	{
-		DBG1(DBG_KNL, "unable to bind netlink socket");
-		destroy(this);
-		return NULL;
-	}
-	if (this->parallel)
-	{
-		lib->watcher->add(lib->watcher, this->socket, WATCHER_READ, watch, this);
-	}
-
-	return &this->public;
-}
-
-/**
- * Described in header.
- */
-void netlink_add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data,
-						  size_t buflen)
-{
-	struct rtattr *rta;
-
-	if (NLMSG_ALIGN(hdr->nlmsg_len) + RTA_LENGTH(data.len) > buflen)
-	{
-		DBG1(DBG_KNL, "unable to add attribute, buffer too small");
-		return;
-	}
-
-	rta = (struct rtattr*)(((char*)hdr) + NLMSG_ALIGN(hdr->nlmsg_len));
-	rta->rta_type = rta_type;
-	rta->rta_len = RTA_LENGTH(data.len);
-	memcpy(RTA_DATA(rta), data.ptr, data.len);
-	hdr->nlmsg_len = NLMSG_ALIGN(hdr->nlmsg_len) + rta->rta_len;
-}
-
-/**
- * Described in header.
- */
-void* netlink_reserve(struct nlmsghdr *hdr, int buflen, int type, int len)
-{
-	struct rtattr *rta;
-
-	if (NLMSG_ALIGN(hdr->nlmsg_len) + RTA_LENGTH(len) > buflen)
-	{
-		DBG1(DBG_KNL, "unable to add attribute, buffer too small");
-		return NULL;
-	}
-
-	rta = ((void*)hdr) + NLMSG_ALIGN(hdr->nlmsg_len);
-	rta->rta_type = type;
-	rta->rta_len = RTA_LENGTH(len);
-	hdr->nlmsg_len = NLMSG_ALIGN(hdr->nlmsg_len) + rta->rta_len;
-
-	return RTA_DATA(rta);
-}