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/*
* Copyright (c) 2018 PANTHEON.tech.
*
* 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.
*/
#ifndef __SYS_UTIL_H__
#define __SYS_UTIL_H__
#include <sysrepo.h>
#include <sysrepo/xpath.h>
#include <sysrepo/plugins.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <scvpp/comm.h>
/* BEGIN sysrepo utils */
#define foreach_change(ds, it, oper, old, new) \
while( (event != SR_EV_ABORT) && \
sr_get_change_next(ds, it, &oper, &old, &new) == SR_ERR_OK)
#define XPATH_SIZE 2000
#define NOT_AVAL "NOT AVAILABLE"
static inline int
get_xpath_key(char *dst, char *xpath, char *node, char *key, int length,
sr_xpath_ctx_t *state) {
char *tmp;
tmp = sr_xpath_key_value(xpath, node, key, state);
if (!tmp) {
SRP_LOG_ERR("%s %s not found.", node, key);
return SR_ERR_INVAL_ARG;
}
strncpy(dst, tmp, length);
sr_xpath_recover(state);
return 0;
}
/* END of sysrepo utils */
typedef struct
{
uint8_t address[4];
} sc_ipv4_addr;
/**
* @brief Extract IP "AAA.BBB.CCC.DDD" from an IP prefix: "AAA.BBB.CCC.DDD/XX"
* @param prefix - IPv4 or IPv6 prefix:
* @return prefix length
*/
static inline int ip_prefix_split(const char* ip_prefix)
{
//find the slash
char* slash = strchr(ip_prefix, '/');
if (NULL == slash)
return -1;
//extract subnet mask length
char * eptr = NULL;
uint8_t plen = strtoul(slash + 1, &eptr, 10);
if (*eptr || plen <= 0)
return -1;
//keep just the address part
*slash = '\0'; //replace '/' with 0
//return prefix length
return plen;
}
/**
* @brief Get IPv4 host address from IPv4 prefix.
*
* @param[out] dst Host IPv4 address.
* @param[in] src IPv4 Prefix.
* @param[in] length dst buffer length.
* @param[out] prefix Get Prefix length, optional value. Can be NULL.
* @return -1 when failure, 0 on success.
*/
static inline int
prefix2address(char *dst, const char *src, uint8_t *prefix_length)
{
if (!src || !dst)
return -1;
char *p = strchr(src, '/');
if (!p)
return -1; // '/' not found
if ((p - src + 1) > VPP_IP4_ADDRESS_STRING_LEN) //+ 1 needed for \0
return -1;
strncpy(dst, src, VPP_IP4_ADDRESS_STRING_LEN);
if (!prefix_length)
*prefix_length = atoi(++p);
return 0;
}
/**
* @brief Helper function for converting netmask (ex: 255.255.255.0)
* to prefix length (ex: 24).
* @param netmask - string of netmask "AAA.BBB.CCC.DDD"
* @return prefix length
*/
static inline uint8_t netmask_to_prefix(const char *netmask)
{
in_addr_t n = 0;
uint8_t i = 0;
inet_pton(AF_INET, netmask, &n);
while (n > 0) {
n = n >> 1;
i++;
}
return i;
}
/**
* @brief Convert prefix length to netmask
* @param prefix - prefix length (ex: 24)
* @return netmask - integer (ex: 111111111111111111111111100000000b )
*/
static inline uint32_t prefix2mask(int prefix)
{
if (prefix) {
return htonl(~((1 << (32 - prefix)) - 1));
} else {
return htonl(0);
}
}
/**
* @brief Get IPv4 broadcast IP address form IPv4 network address.
*
* @param[out] broadcat Broadcast Ipv4 address.
* @param[in] network Network IPv4 address.
* @param[in] prefix Prefix number.
* @return -1 when failure, 0 on success.
*/
static inline int get_network_broadcast(sc_ipv4_addr *broadcast, const sc_ipv4_addr *network,
uint8_t prefix_length)
{
uint8_t mask = ~0;
uint8_t tmp_p = prefix_length;
int i;
ARG_CHECK2(-1, network, broadcast);
if (32 < prefix_length) {
SRP_LOG_ERR_MSG("Prefix length to big.");
return -1;
}
for (i = 0; i < 4 ; i++) {
broadcast->address[i] = network->address[i] |
(mask >> (tmp_p > 8 ? 8 : tmp_p));
if (tmp_p >= 8) {
tmp_p -= 8;
} else {
tmp_p = 0;
}
}
return 0;
}
/**
* @brief Get last IPv4 address from the IP range.
*
* @param[out] last_ip_address Last Ipv4 address.
* @param[in] first_ip_address First IPv4 address.
* @param[in] prefix Prefix number.
* @return -1 when failure, 0 on success.
*/
static inline int get_last_ip_address(sc_ipv4_addr* last_ip_address,
const sc_ipv4_addr* first_ip_address,
uint8_t prefix_length)
{
return get_network_broadcast(last_ip_address, first_ip_address,
prefix_length);
}
#endif /* __SYS_UTIL_H__ */
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