123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
// SPDX-License-Identifier: LGPL-2.1-or-later
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/**
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* This file is part of libnvme.
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* Copyright (c) 2023 Martin Belanger, Dell Technologies Inc.
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*/
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#include <sys/types.h>
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#include <ifaddrs.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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struct ifaddrs_storage {
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struct ifaddrs ifa;
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union {
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/* Reserve space for the biggest of the sockaddr types */
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struct sockaddr_in s4;
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struct sockaddr_in6 s6;
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} addr, netmask, broadaddr;
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char name[IF_NAMESIZE + 1];
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};
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static void init_entry(struct ifaddrs_storage *storage,
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const char *ifname,
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int family,
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uint32_t addr1,
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uint32_t addr2,
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uint32_t addr3,
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uint32_t addr4,
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bool last)
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{
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struct ifaddrs *p;
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p = &storage->ifa;
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p->ifa_next = last ? NULL : &storage[1].ifa;
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p->ifa_name = storage->name;
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strcpy(p->ifa_name, ifname);
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p->ifa_flags = 0;
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if (family == AF_INET) {
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struct sockaddr_in *ipv4;
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ipv4 = &storage->addr.s4;
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ipv4->sin_family = family;
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ipv4->sin_port = 0;
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ipv4->sin_addr.s_addr = htonl(addr1);
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p->ifa_addr = (struct sockaddr *)ipv4;
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ipv4 = &storage->netmask.s4;
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ipv4->sin_family = family;
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ipv4->sin_port = 0;
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ipv4->sin_addr.s_addr = 0xffffff00;
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p->ifa_netmask = (struct sockaddr *)ipv4;
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ipv4 = &storage->broadaddr.s4;
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ipv4->sin_family = family;
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ipv4->sin_port = 0;
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ipv4->sin_addr.s_addr = 0;
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p->ifa_broadaddr = (struct sockaddr *)ipv4;;
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} else {
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struct sockaddr_in6 *ipv6;
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ipv6 = &storage->addr.s6;
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ipv6->sin6_family = family;
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ipv6->sin6_port = 0;
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ipv6->sin6_flowinfo = 0;
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ipv6->sin6_addr.s6_addr32[0] = htonl(addr1);
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ipv6->sin6_addr.s6_addr32[1] = htonl(addr2);
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ipv6->sin6_addr.s6_addr32[2] = htonl(addr3);
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ipv6->sin6_addr.s6_addr32[3] = htonl(addr4);
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ipv6->sin6_scope_id = 0;
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p->ifa_addr = (struct sockaddr *)ipv6;
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ipv6 = &storage->netmask.s6;
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ipv6->sin6_family = family;
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ipv6->sin6_port = 0;
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ipv6->sin6_flowinfo = 0;
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ipv6->sin6_addr.s6_addr32[0] = 0xffffffff;
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ipv6->sin6_addr.s6_addr32[1] = 0xffffffff;
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ipv6->sin6_addr.s6_addr32[2] = 0xffffffff;
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ipv6->sin6_addr.s6_addr32[3] = 0;
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ipv6->sin6_scope_id = 0;
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p->ifa_netmask = (struct sockaddr *)ipv6;
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ipv6 = &storage->broadaddr.s6;
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ipv6->sin6_family = family;
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ipv6->sin6_port = 0;
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ipv6->sin6_flowinfo = 0;
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ipv6->sin6_addr.s6_addr32[0] = 0;
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ipv6->sin6_addr.s6_addr32[1] = 0;
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ipv6->sin6_addr.s6_addr32[2] = 0;
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ipv6->sin6_addr.s6_addr32[3] = 0;
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ipv6->sin6_scope_id = 0;
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p->ifa_broadaddr = (struct sockaddr *)ipv6;
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}
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p->ifa_data = NULL;
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}
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int getifaddrs(struct ifaddrs **ifap) {
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struct ifaddrs_storage *storage;
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/* Allocate memory for 4 interfaces */
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storage = (struct ifaddrs_storage *)calloc(4, sizeof(struct ifaddrs_storage));
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*ifap = &storage[0].ifa;
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init_entry(&storage[0], "eth0", AF_INET, 0xc0a80114, 0, 0, 0, false); /* 192.168.1.20 */
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init_entry(&storage[1], "eth0", AF_INET6, 0xfe800000, 0, 0, 0xdeadbeef, false); /* fe80::dead:beef */
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/* Loopback interface */
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init_entry(&storage[2], "lo", AF_INET, 0x7f000001, 0, 0, 0, false); /* 127.0.0.1 */
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init_entry(&storage[3], "lo", AF_INET6, 0, 0, 0, 1, true); /* ::1 */
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return 0;
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}
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void freeifaddrs(struct ifaddrs *ifa) {
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free(ifa);
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}
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