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nuttx/libs/libc/net/lib_getifaddrs.c
Xiang Xiao cc1a1b5781 net: Implement getifaddrs and freeifaddrs 
specify here:
https://man7.org/linux/man-pages/man3/getifaddrs.3.html

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2021-12-21 11:01:33 -03:00

283 lines
9.1 KiB
C
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/****************************************************************************
* libs/libc/net/lib_getifaddrs.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <errno.h>
#include <ifaddrs.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <string.h>
#include <unistd.h>
#include <nuttx/net/netconfig.h>
#include "libc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#undef broadaddr
#define broadaddr dstaddr
/****************************************************************************
* Private Type Definitions
****************************************************************************/
struct myifaddrs
{
struct ifaddrs addrs;
char name[IF_NAMESIZE];
struct sockaddr_storage addr;
struct sockaddr_storage netmask;
struct sockaddr_storage dstaddr;
struct sockaddr hwaddr;
};
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: getifaddrs
*
* Description:
* The getifaddrs() function returns a linked list of ifaddrs structures,
* each containing information about one of the network interfaces on the
* local system. The ifaddrs structure contains at least the following
* entries:
* struct ifaddrs *ifa_next;
* char *ifa_name;
* unsigned int ifa_flags;
* struct sockaddr *ifa_addr;
* struct sockaddr *ifa_netmask;
* struct sockaddr *ifa_dstaddr;
* void *ifa_data;
* The ifa_next field contains a pointer to the next structure on
* the list, or NULL if this is the last item of the list.
*
* The ifa_name points to the null-terminated interface name.
*
* The ifa_flags field contains the interface flags, as returned by
* the SIOCGIFFLAGS ioctl(2) operation (see netdevice(7) for a list
* of these flags).
*
* The ifa_addr field points to a structure containing the interface
* address. (The sa_family subfield should be consulted to
* determine the format of the address structure.) This field may
* contain a null pointer.
*
* The ifa_netmask field points to a structure containing the
* netmask associated with ifa_addr, if applicable for the address
* family. This field may contain a null pointer.
*
* Depending on whether the bit IFF_BROADCAST or IFF_POINTOPOINT is
* set in ifa_flags (only one can be set at a time), either
* ifa_broadaddr will contain the broadcast address associated with
* ifa_addr (if applicable for the address family) or ifa_dstaddr
* will contain the destination address of the point-to-point
* interface.
*
* The ifa_data field points to a buffer containing address-family-
* specific data; this field may be NULL if there is no such data
* for this interface.
*
* Input Parameters:
* None
*
* Returned Value:
* On success, getifaddrs() returns pointer to the linked list; on error,
* NULL is returned, and errno is set to indicate the error.
*
****************************************************************************/
int getifaddrs(FAR struct ifaddrs **addrs)
{
FAR struct myifaddrs *myaddrs = NULL;
int sockfd;
int i;
if (addrs == NULL)
{
set_errno(EINVAL);
return ERROR;
}
sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL);
if (sockfd < 0)
{
return sockfd;
}
for (i = 1, *addrs = NULL; i <= MAX_IFINDEX; i++)
{
unsigned int flags;
struct lifreq req;
memset(&req, 0, sizeof(req));
req.lifr_ifindex = i;
if (ioctl(sockfd, SIOCGIFNAME, (unsigned long)&req) < 0)
{
continue; /* Empty slot, try next one */
}
if (ioctl(sockfd, SIOCGIFFLAGS, (unsigned long)&req) < 0)
{
goto err;
}
flags = req.lifr_flags;
if (myaddrs != NULL)
{
myaddrs->addrs.ifa_next = lib_zalloc(sizeof(*myaddrs));
myaddrs = (FAR struct myifaddrs *)myaddrs->addrs.ifa_next;
}
else
{
*addrs = lib_zalloc(sizeof(*myaddrs));
myaddrs = (FAR struct myifaddrs *)*addrs;
}
if (myaddrs == NULL)
{
goto err;
}
myaddrs->addrs.ifa_name = myaddrs->name;
strncpy(myaddrs->name, req.lifr_name, IF_NAMESIZE);
myaddrs->addrs.ifa_flags = flags;
#ifdef CONFIG_NET_IPv4
if (ioctl(sockfd, SIOCGIFADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_addr = (FAR struct sockaddr *)&myaddrs->addr;
memcpy(&myaddrs->addr, &req.lifr_addr, sizeof(req.lifr_addr));
if (ioctl(sockfd, SIOCGIFNETMASK, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_netmask =
(FAR struct sockaddr *)&myaddrs->netmask;
memcpy(&myaddrs->netmask,
&req.lifr_netmask, sizeof(req.lifr_netmask));
}
if (ioctl(sockfd, SIOCGIFDSTADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_dstaddr =
(FAR struct sockaddr *)&myaddrs->dstaddr;
memcpy(&myaddrs->dstaddr,
&req.lifr_dstaddr, sizeof(req.lifr_dstaddr));
}
else if (ioctl(sockfd, SIOCGIFBRDADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_broadaddr =
(FAR struct sockaddr *)&myaddrs->broadaddr;
memcpy(&myaddrs->broadaddr,
&req.lifr_broadaddr, sizeof(req.lifr_broadaddr));
}
if (ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_data = &myaddrs->hwaddr;
memcpy(&myaddrs->hwaddr,
&req.lifr_hwaddr, sizeof(req.lifr_hwaddr));
}
}
#endif
#ifdef CONFIG_NET_IPv6
if (ioctl(sockfd, SIOCGLIFADDR, (unsigned long)&req) >= 0)
{
/* Has IPv4 entry ? */
if (myaddrs->addrs.ifa_addr)
{
/* Yes, allocate the new entry for IPv6 */
myaddrs->addrs.ifa_next = lib_zalloc(sizeof(*myaddrs));
myaddrs = (FAR struct myifaddrs *)myaddrs->addrs.ifa_next;
if (myaddrs == NULL)
{
goto err;
}
myaddrs->addrs.ifa_name = myaddrs->name;
strncpy(myaddrs->name, req.lifr_name, IF_NAMESIZE);
myaddrs->addrs.ifa_flags = flags;
}
myaddrs->addrs.ifa_addr = (FAR struct sockaddr *)&myaddrs->addr;
memcpy(&myaddrs->addr, &req.lifr_addr, sizeof(req.lifr_addr));
if (ioctl(sockfd, SIOCGLIFNETMASK, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_netmask =
(FAR struct sockaddr *)&myaddrs->netmask;
memcpy(&myaddrs->netmask,
&req.lifr_netmask, sizeof(req.lifr_netmask));
}
if (ioctl(sockfd, SIOCGLIFDSTADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_dstaddr =
(FAR struct sockaddr *)&myaddrs->dstaddr;
memcpy(&myaddrs->dstaddr,
&req.lifr_dstaddr, sizeof(req.lifr_dstaddr));
}
else if (ioctl(sockfd, SIOCGLIFBRDADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_broadaddr =
(FAR struct sockaddr *)&myaddrs->broadaddr;
memcpy(&myaddrs->broadaddr,
&req.lifr_broadaddr, sizeof(req.lifr_broadaddr));
}
if (ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req) >= 0)
{
myaddrs->addrs.ifa_data = &myaddrs->hwaddr;
memcpy(&myaddrs->hwaddr,
&req.lifr_hwaddr, sizeof(req.lifr_hwaddr));
}
}
#endif
}
close(sockfd);
return OK;
err:
if (*addrs != NULL)
{
freeifaddrs(*addrs);
*addrs = NULL;
}
close(sockfd);
return ERROR;
}
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