Add getifaddrs(3) and freeifaddrs(3).
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f291054465
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580b71ae89
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@ -378,6 +378,8 @@ grp/getgrnam.o \
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grp/getgrnam_r.o \
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grp/getgrnam_r.o \
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grp/opengr.o \
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grp/opengr.o \
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grp/setgrent.o \
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grp/setgrent.o \
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ifaddrs/freeifaddrs.o \
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ifaddrs/getifaddrs.o \
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init/init.o \
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init/init.o \
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ioleast/preadall.o \
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ioleast/preadall.o \
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ioleast/preadleast.o \
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ioleast/preadleast.o \
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@ -0,0 +1,31 @@
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/*
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* Copyright (c) 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ifaddrs/freeifaddrs.c
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* Free list of network interface addresses.
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*/
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#include <ifaddrs.h>
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#include <stdlib.h>
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void freeifaddrs(struct ifaddrs* ifa)
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{
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while ( ifa )
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{
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struct ifaddrs* todelete = ifa;
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ifa = ifa->ifa_next;
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free(todelete);
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}
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}
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@ -0,0 +1,114 @@
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/*
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* Copyright (c) 2016, 2017 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ifaddrs/getifaddrs.c
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* List network interface addresses.
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*/
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <endian.h>
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#include <fcntl.h>
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#include <ifaddrs.h>
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#include <net/if.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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union ifaddrs_addr
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{
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struct sockaddr_in in;
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struct sockaddr_in6 in6;
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};
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struct ifaddrs_storage
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{
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struct ifaddrs pub;
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char name[IF_NAMESIZE];
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union ifaddrs_addr addr;
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union ifaddrs_addr netmask;
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union ifaddrs_addr broadcast;
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};
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int getifaddrs(struct ifaddrs** ifas_ptr)
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{
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struct if_nameindex* ifs = if_nameindex();
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if ( !ifs )
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return -1;
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size_t ifcount = 0;
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while ( ifs[ifcount].if_index )
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ifcount++;
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struct ifaddrs* ifas = NULL;
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size_t i = ifcount;
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while ( i-- )
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{
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struct if_nameindex* netif = &ifs[i];
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char path[5 + IF_NAMESIZE];
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snprintf(path, sizeof(path), "/dev/%s", netif->if_name);
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int fd = open(path, O_RDONLY);
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if ( fd < 0 )
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{
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if_freenameindex(ifs);
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freeifaddrs(ifas);
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return -1;
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}
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struct if_config cfg;
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if ( ioctl(fd, NIOC_GETCONFIG, &cfg) < 0 )
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{
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close(fd);
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if_freenameindex(ifs);
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freeifaddrs(ifas);
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return -1;
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}
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close(fd);
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if ( be32toh(cfg.inet.address.s_addr) != INADDR_ANY )
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{
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struct ifaddrs_storage* ifa =
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calloc(sizeof(struct ifaddrs_storage), 1);
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if ( !ifa )
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{
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if_freenameindex(ifs);
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freeifaddrs(ifas);
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return -1;
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}
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ifa->pub.ifa_next = ifas;
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ifas = &ifa->pub;
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strlcpy(ifa->name, netif->if_name, sizeof(ifa->name));
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ifa->pub.ifa_name = ifa->name;
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ifa->pub.ifa_flags = 0;
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ifa->addr.in.sin_family = AF_INET;
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memcpy(&ifa->addr.in.sin_addr, &cfg.inet.address,
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sizeof(struct in_addr));
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ifa->pub.ifa_addr = (struct sockaddr*) &ifa->addr.in;
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ifa->netmask.in.sin_family = AF_INET;
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memcpy(&ifa->netmask.in.sin_addr, &cfg.inet.subnet,
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sizeof(struct in_addr));
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ifa->pub.ifa_netmask = (struct sockaddr*) &ifa->netmask.in;
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ifa->broadcast.in.sin_family = AF_INET;
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ifa->broadcast.in.sin_addr.s_addr =
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ifa->addr.in.sin_addr.s_addr |
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~ifa->netmask.in.sin_addr.s_addr;
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ifa->pub.ifa_dstaddr = (struct sockaddr*) &ifa->broadcast.in;
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ifa->pub.ifa_data = NULL;
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ifa->pub.ifa_size = sizeof(struct sockaddr_in);
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}
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// TODO: IPv6 when struct if_config has IPv6 support.
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}
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if_freenameindex(ifs);
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*ifas_ptr = ifas;
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return 0;
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}
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@ -0,0 +1,59 @@
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/*
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* Copyright (c) 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* ifaddrs.h
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* Network interface addresses.
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*/
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#ifndef _INCLUDE_IFADDRS_H
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#define _INCLUDE_IFADDRS_H
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#include <sys/cdefs.h>
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#include <sys/__/types.h>
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#ifndef __socklen_t_defined
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#define __socklen_t_defined
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typedef __socklen_t socklen_t;
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#endif
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struct ifaddrs
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{
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struct ifaddrs* ifa_next;
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char* ifa_name;
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unsigned int ifa_flags;
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struct sockaddr* ifa_addr;
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struct sockaddr* ifa_netmask;
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struct sockaddr* ifa_dstaddr;
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void* ifa_data;
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socklen_t ifa_size;
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};
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#ifndef ifa_broadaddr
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#define ifa_broadaddr ifa_dstaddr
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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int getifaddrs(struct ifaddrs**);
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void freeifaddrs(struct ifaddrs*);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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@ -330,6 +330,7 @@ temporarily fail with
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.Xr getsockopt 2 ,
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.Xr getsockopt 2 ,
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.Xr ioctl 2 ,
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.Xr ioctl 2 ,
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.Xr setsockopt 2 ,
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.Xr setsockopt 2 ,
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.Xr getifaddrs 3 ,
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.Xr if_nameindex 3 ,
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.Xr if_nameindex 3 ,
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.Xr arp 4 ,
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.Xr arp 4 ,
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.Xr ether 4 ,
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.Xr ether 4 ,
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