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/** @file
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* NetLabel Message Functions
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*
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* Author: Paul Moore <paul@paul-moore.com>
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*
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <linux/types.h>
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#include <libnetlabel.h>
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#include "netlabel_internal.h"
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/*
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* Allocation Functions
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*/
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/**
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* Free a NetLabel message
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* @param msg the NetLabel message
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*
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* Free the memory associated with a NetLabel message.
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*
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*/
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void nlbl_msg_free(nlbl_msg *msg)
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{
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if (msg == NULL)
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return;
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nlmsg_free(msg);
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}
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/**
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* Create a new NetLabel message
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*
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* Creates a new NetLabel message and allocates space for both the Netlink and
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* Generic Netlink headers.
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*
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*/
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nlbl_msg *nlbl_msg_new(void)
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{
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nlbl_msg *msg;
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void *msg_buf;
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msg = nlmsg_alloc();
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if (msg == NULL)
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goto msg_new_failure;
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msg_buf = genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, 0, 0, 0, 0, 0);
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if (msg_buf == NULL)
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goto msg_new_failure;
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return msg;
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msg_new_failure:
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nlbl_msg_free(msg);
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return NULL;
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}
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/*
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* Netlink Header Functions
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*/
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/**
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* Get the Netlink header from the NetLabel message
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* @param msg the NetLabel message
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*
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* Returns the Netlink header on success, or NULL on failure.
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*
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*/
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struct nlmsghdr *nlbl_msg_nlhdr(nlbl_msg *msg)
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{
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if (msg == NULL)
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return NULL;
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return nlmsg_hdr(msg);
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}
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/**
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* Get the Generic Netlink header from the NetLabel message
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* @param msg the NetLabel message
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*
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* Returns the Generic Netlink header on success, or NULL on failure.
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*
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*/
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struct genlmsghdr *nlbl_msg_genlhdr(nlbl_msg *msg)
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{
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struct nlmsghdr *nl_hdr;
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/* NOTE: nlbl_msg_nlhdr() can handle being passed a NULL msg */
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nl_hdr = nlbl_msg_nlhdr(msg);
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if (nl_hdr == NULL)
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return NULL;
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return genlmsg_hdr(nl_hdr);
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}
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/*
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* Netlink Message Functions
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*/
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/**
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* Return the nlmsgerr struct in the Netlink message
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* @param msg the NetLabel message
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*
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* Returns a pointer to the nlmsgerr struct in a NLMSG_ERROR Netlink message
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* or NULL on failure.
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*
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*/
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struct nlmsgerr *nlbl_msg_err(nlbl_msg *msg)
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{
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struct nlmsghdr *nl_hdr;
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/* NOTE: nlbl_msg_nlhdr() can handle being passed a NULL msg */
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nl_hdr = nlbl_msg_nlhdr(msg);
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if (nl_hdr == NULL || nl_hdr->nlmsg_type != NLMSG_ERROR)
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return NULL;
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return nlmsg_data(nl_hdr);
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}
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/*
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* Netlink Attribute Functions
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*/
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/**
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* Get the head of the Netlink attributes from a NetLabel msg
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* @param msg the NetLabel message
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*
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* Returns the head of the Netlink attributes from a NetLabel message on
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* success, or NULL on failure.
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*
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*/
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struct nlattr *nlbl_attr_head(nlbl_msg *msg)
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{
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struct genlmsghdr *genl_hdr;
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/* NOTE: nlbl_msg_genlhdr() can handle being passed a NULL msg */
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genl_hdr = nlbl_msg_genlhdr(msg);
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if (genl_hdr == NULL)
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return NULL;
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return genlmsg_attrdata(genl_hdr, 0);
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}
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/**
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* Find an attribute in a NetLabel message
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* @param msg the NetLabel message
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* @param nla_type the attribute type
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*
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* Search @msg looking for the @nla_type attribute. Return the attribute on
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* success, or NULL on failure.
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*
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*/
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struct nlattr *nlbl_attr_find(nlbl_msg *msg, int nla_type)
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{
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struct genlmsghdr *genl_hdr;
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struct nlattr *nla_head;
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/* NOTE: nlbl_msg_genlhdr() can handle being passed a NULL msg */
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genl_hdr = nlbl_msg_genlhdr(msg);
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if (genl_hdr == NULL)
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return NULL;
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nla_head = genlmsg_attrdata(genl_hdr, 0);
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if (nla_head == NULL)
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return NULL;
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return nla_find(nla_head, genlmsg_attrlen(genl_hdr, 0), nla_type);
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}
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