mirror of https://github.com/c-ares/c-ares.git
Support ipv6 link-local servers and %iface syntax (#646)
Some environments may send router advertisements on a link setting their link-local (fe80::/10) address as a valid DNS server to the remote system. This will cause a DNS entry to be created like `fe80::1%iface`, since all link-local network interfaces are technically part of the same /10 subnet, it must be told what interface to send packets through explicitly if there are multiple physical interfaces. This PR adds support for the %iface modifier when setting DNS servers via `/etc/resolv.conf` as well as via `ares_set_servers_csv()`. For MacOS and iOS it is assumed that libresolve will set the `sin6_scope_id` and should be supported, but my test systems don't seem to read the Router Advertisement for RDNSS link-local. Specifying the link-local dns server on MacOS via adig has been tested and confirmed working. For Windows, this is similar to MacOS in that the system doesn't seem to honor the RDNSS RA, but specifying manually has been tested to work. At this point, Android support does not exist. Fixes Bug #462 Supersedes PR #463 Fix By: Brad House (@bradh352) and Serhii Purik (@sergvpurik)pull/651/head
Brad House
12 months ago
committed by
GitHub
parent
873b09c7fa
commit
d974c556bb
26 changed files with 1365 additions and 162 deletions
@ -0,0 +1,4 @@ |
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.\" |
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.\" Copyright (C) Daniel Stenberg |
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.\" SPDX-License-Identifier: MIT |
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.so man3/ares_set_servers_csv.3 |
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@ -0,0 +1,594 @@ |
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/* MIT License
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* |
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* Copyright (c) 2023 Brad House |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the next |
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* paragraph) shall be included in all copies or substantial portions of the |
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* Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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* |
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* SPDX-License-Identifier: MIT |
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*/ |
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#include "ares_setup.h" |
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#include "ares.h" |
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#include "ares_private.h" |
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#ifdef USE_WINSOCK |
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# include <winsock2.h> |
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# include <ws2tcpip.h> |
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# if defined(HAVE_IPHLPAPI_H) |
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# include <iphlpapi.h> |
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# endif |
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# if defined(HAVE_NETIOAPI_H) |
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# include <netioapi.h> |
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# endif |
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#endif |
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#ifdef HAVE_SYS_TYPES_H |
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# include <sys/types.h> |
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#endif |
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#ifdef HAVE_SYS_SOCKET_H |
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# include <sys/socket.h> |
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#endif |
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#ifdef HAVE_NET_IF_H |
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# include <net/if.h> |
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#endif |
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#ifdef HAVE_IFADDRS_H |
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# include <ifaddrs.h> |
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#endif |
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#ifdef HAVE_SYS_IOCTL_H |
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# include <sys/ioctl.h> |
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#endif |
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#ifdef HAVE_NETINET_IN_H |
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# include <netinet/in.h> |
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#endif |
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#ifndef IFNAMSIZ |
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# define IFNAMSIZ 64 |
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#endif |
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static ares_status_t ares__iface_ips_enumerate(ares__iface_ips_t *ips, |
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const char *name); |
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typedef struct { |
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char *name; |
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struct ares_addr addr; |
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unsigned char netmask; |
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unsigned int ll_scope; |
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ares__iface_ip_flags_t flags; |
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} ares__iface_ip_t; |
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struct ares__iface_ips { |
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ares__iface_ip_t *ips; |
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size_t cnt; |
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size_t alloc_size; |
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ares__iface_ip_flags_t enum_flags; |
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}; |
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static ares__iface_ips_t *ares__iface_ips_alloc(ares__iface_ip_flags_t flags) |
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{ |
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ares__iface_ips_t *ips = ares_malloc_zero(sizeof(*ips)); |
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if (ips == NULL) { |
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return NULL; |
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} |
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/* Prealloc 4 entries */ |
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ips->alloc_size = 4; |
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ips->ips = ares_malloc_zero(ips->alloc_size * sizeof(*ips->ips)); |
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if (ips->ips == NULL) { |
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ares_free(ips); |
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return NULL; |
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} |
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ips->enum_flags = flags; |
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return ips; |
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} |
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static void ares__iface_ip_destroy(ares__iface_ip_t *ip) |
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{ |
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if (ip == NULL) { |
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return; |
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} |
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ares_free(ip->name); |
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memset(ip, 0, sizeof(*ip)); |
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} |
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void ares__iface_ips_destroy(ares__iface_ips_t *ips) |
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{ |
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size_t i; |
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if (ips == NULL) { |
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return; |
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} |
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for (i = 0; i < ips->cnt; i++) { |
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ares__iface_ip_destroy(&ips->ips[i]); |
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} |
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ares_free(ips->ips); |
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ares_free(ips); |
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} |
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ares_status_t ares__iface_ips(ares__iface_ips_t **ips, |
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ares__iface_ip_flags_t flags, const char *name) |
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{ |
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ares_status_t status; |
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if (ips == NULL) { |
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return ARES_EFORMERR; |
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} |
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*ips = ares__iface_ips_alloc(flags); |
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if (*ips == NULL) { |
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return ARES_ENOMEM; |
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} |
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status = ares__iface_ips_enumerate(*ips, name); |
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if (status != ARES_SUCCESS) { |
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ares__iface_ips_destroy(*ips); |
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*ips = NULL; |
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return status; |
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} |
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return ARES_SUCCESS; |
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} |
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static ares_status_t |
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ares__iface_ips_add(ares__iface_ips_t *ips, ares__iface_ip_flags_t flags, |
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const char *name, const struct ares_addr *addr, |
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unsigned char netmask, unsigned int ll_scope) |
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{ |
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size_t idx; |
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if (ips == NULL || name == NULL || addr == NULL) { |
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return ARES_EFORMERR; |
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} |
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/* Don't want loopback */ |
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if (flags & ARES_IFACE_IP_LOOPBACK && |
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!(ips->enum_flags & ARES_IFACE_IP_LOOPBACK)) { |
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return ARES_SUCCESS; |
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} |
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/* Don't want offline */ |
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if (flags & ARES_IFACE_IP_OFFLINE && |
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!(ips->enum_flags & ARES_IFACE_IP_OFFLINE)) { |
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return ARES_SUCCESS; |
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} |
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/* Check for link-local */ |
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if (ares__addr_is_linklocal(addr)) { |
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flags |= ARES_IFACE_IP_LINKLOCAL; |
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} |
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if (flags & ARES_IFACE_IP_LINKLOCAL && |
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!(ips->enum_flags & ARES_IFACE_IP_LINKLOCAL)) { |
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return ARES_SUCCESS; |
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} |
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/* Set address flag based on address provided */ |
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if (addr->family == AF_INET) { |
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flags |= ARES_IFACE_IP_V4; |
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} |
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if (addr->family == AF_INET6) { |
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flags |= ARES_IFACE_IP_V6; |
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} |
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/* If they specified either v4 or v6 validate flags otherwise assume they
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* want to enumerate both */ |
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if (ips->enum_flags & (ARES_IFACE_IP_V4 | ARES_IFACE_IP_V6)) { |
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if (flags & ARES_IFACE_IP_V4 && !(ips->enum_flags & ARES_IFACE_IP_V4)) { |
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return ARES_SUCCESS; |
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} |
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if (flags & ARES_IFACE_IP_V6 && !(ips->enum_flags & ARES_IFACE_IP_V6)) { |
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return ARES_SUCCESS; |
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} |
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} |
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/* Allocate more ips */ |
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if (ips->cnt + 1 > ips->alloc_size) { |
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void *temp; |
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size_t alloc_size; |
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alloc_size = ares__round_up_pow2(ips->alloc_size + 1); |
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temp = ares_realloc_zero(ips->ips, ips->alloc_size * sizeof(ips->ips), |
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alloc_size * sizeof(ips->ips)); |
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if (temp == NULL) { |
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return ARES_ENOMEM; |
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} |
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ips->ips = temp; |
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ips->alloc_size = alloc_size; |
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} |
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/* Add */ |
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idx = ips->cnt++; |
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ips->ips[idx].flags = flags; |
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ips->ips[idx].netmask = netmask; |
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ips->ips[idx].ll_scope = ll_scope; |
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memcpy(&ips->ips[idx].addr, addr, sizeof(*addr)); |
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ips->ips[idx].name = ares_strdup(name); |
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if (ips->ips[idx].name == NULL) { |
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return ARES_ENOMEM; |
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} |
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return ARES_SUCCESS; |
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} |
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size_t ares__iface_ips_cnt(const ares__iface_ips_t *ips) |
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{ |
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if (ips == NULL) { |
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return 0; |
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} |
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return ips->cnt; |
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} |
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const char *ares__iface_ips_get_name(const ares__iface_ips_t *ips, size_t idx) |
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{ |
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if (ips == NULL || idx >= ips->cnt) { |
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return NULL; |
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} |
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return ips->ips[idx].name; |
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} |
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const struct ares_addr *ares__iface_ips_get_addr(const ares__iface_ips_t *ips, |
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size_t idx) |
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{ |
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if (ips == NULL || idx >= ips->cnt) { |
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return NULL; |
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} |
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return &ips->ips[idx].addr; |
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} |
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ares__iface_ip_flags_t ares__iface_ips_get_flags(const ares__iface_ips_t *ips, |
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size_t idx) |
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{ |
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if (ips == NULL || idx >= ips->cnt) { |
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return 0; |
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} |
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return ips->ips[idx].flags; |
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} |
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unsigned char ares__iface_ips_get_netmask(const ares__iface_ips_t *ips, |
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size_t idx) |
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{ |
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if (ips == NULL || idx >= ips->cnt) { |
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return 0; |
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} |
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return ips->ips[idx].netmask; |
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} |
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unsigned int ares__iface_ips_get_ll_scope(const ares__iface_ips_t *ips, |
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size_t idx) |
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{ |
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if (ips == NULL || idx >= ips->cnt) { |
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return 0; |
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} |
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return ips->ips[idx].ll_scope; |
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} |
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#ifdef USE_WINSOCK |
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#if 0 |
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static char *wcharp_to_charp(const wchar_t *in) |
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{ |
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char *out; |
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int len; |
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len = WideCharToMultiByte(CP_UTF8, 0, in, -1, NULL, 0, NULL, NULL); |
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if (len == -1) { |
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return NULL; |
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} |
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out = ares_malloc_zero((size_t)len + 1); |
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if (WideCharToMultiByte(CP_UTF8, 0, in, -1, out, len, NULL, NULL) == -1) { |
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ares_free(out); |
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return NULL; |
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} |
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return out; |
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} |
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#endif |
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static ares_bool_t name_match(const char *name, const char *adapter_name, |
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unsigned int ll_scope) |
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{ |
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if (name == NULL || *name == 0) { |
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return ARES_TRUE; |
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} |
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if (strcasecmp(name, adapter_name) == 0) { |
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return ARES_TRUE; |
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} |
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if (ares_str_isnum(name) && (unsigned int)atoi(name) == ll_scope) { |
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return ARES_TRUE; |
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} |
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return ARES_FALSE; |
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} |
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static ares_status_t ares__iface_ips_enumerate(ares__iface_ips_t *ips, |
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const char *name) |
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{ |
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ULONG myflags = GAA_FLAG_INCLUDE_PREFIX /*|GAA_FLAG_INCLUDE_ALL_INTERFACES */; |
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ULONG outBufLen = 0; |
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DWORD retval; |
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IP_ADAPTER_ADDRESSES *addresses = NULL; |
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IP_ADAPTER_ADDRESSES *address = NULL; |
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ares_status_t status = ARES_SUCCESS; |
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/* Get necessary buffer size */ |
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GetAdaptersAddresses(AF_UNSPEC, myflags, NULL, NULL, &outBufLen); |
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if (outBufLen == 0) { |
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status = ARES_EFILE; |
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goto done; |
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} |
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addresses = ares_malloc_zero(outBufLen); |
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if (addresses == NULL) { |
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status = ARES_ENOMEM; |
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goto done; |
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} |
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retval = |
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GetAdaptersAddresses(AF_UNSPEC, myflags, NULL, addresses, &outBufLen); |
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if (retval != ERROR_SUCCESS) { |
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status = ARES_EFILE; |
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goto done; |
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} |
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for (address = addresses; address != NULL; address = address->Next) { |
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IP_ADAPTER_UNICAST_ADDRESS *ipaddr = NULL; |
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ares__iface_ip_flags_t addrflag = 0; |
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char ifname[64] = ""; |
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#if defined(HAVE_CONVERTINTERFACEINDEXTOLUID) && defined(HAVE_CONVERTINTERFACELUIDTONAMEA) |
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/* Retrieve name from interface index.
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* address->AdapterName appears to be a GUID/UUID of some sort, not a name. |
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* address->FriendlyName is user-changeable. |
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* That said, this doesn't appear to help us out on systems that don't |
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* have if_nametoindex() or if_indextoname() as they don't have these |
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* functions either! */ |
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NET_LUID luid; |
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ConvertInterfaceIndexToLuid(address->IfIndex, &luid); |
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ConvertInterfaceLuidToNameA(&luid, ifname, sizeof(ifname)); |
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#else |
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ares_strcpy(ifname, address->AdapterName, sizeof(ifname)); |
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#endif |
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if (address->OperStatus != IfOperStatusUp) { |
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addrflag |= ARES_IFACE_IP_OFFLINE; |
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} |
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if (address->IfType == IF_TYPE_SOFTWARE_LOOPBACK) { |
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addrflag |= ARES_IFACE_IP_LOOPBACK; |
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} |
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for (ipaddr = address->FirstUnicastAddress; ipaddr != NULL; |
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ipaddr = ipaddr->Next) { |
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struct ares_addr addr; |
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if (ipaddr->Address.lpSockaddr->sa_family == AF_INET) { |
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struct sockaddr_in *sockaddr_in = |
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(struct sockaddr_in *)((void *)ipaddr->Address.lpSockaddr); |
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addr.family = AF_INET; |
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memcpy(&addr.addr.addr4, &sockaddr_in->sin_addr, |
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sizeof(addr.addr.addr4)); |
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} else if (ipaddr->Address.lpSockaddr->sa_family == AF_INET6) { |
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struct sockaddr_in6 *sockaddr_in6 = |
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(struct sockaddr_in6 *)((void *)ipaddr->Address.lpSockaddr); |
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addr.family = AF_INET6; |
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memcpy(&addr.addr.addr6, &sockaddr_in6->sin6_addr, |
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sizeof(addr.addr.addr6)); |
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} else { |
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/* Unknown */ |
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continue; |
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} |
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/* Sometimes windows may use numerics to indicate a DNS server's adapter,
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* which corresponds to the index rather than the name. Check and |
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* validate both. */ |
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if (!name_match(name, ifname, address->Ipv6IfIndex)) { |
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continue; |
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} |
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||||||
|
status = ares__iface_ips_add(ips, addrflag, ifname, &addr, |
||||||
|
ipaddr->OnLinkPrefixLength /* netmask */, |
||||||
|
address->Ipv6IfIndex /* ll_scope */); |
||||||
|
|
||||||
|
if (status != ARES_SUCCESS) { |
||||||
|
goto done; |
||||||
|
} |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
done: |
||||||
|
ares_free(addresses); |
||||||
|
return status; |
||||||
|
} |
||||||
|
|
||||||
|
#elif defined(HAVE_GETIFADDRS) |
||||||
|
|
||||||
|
static unsigned char count_addr_bits(const unsigned char *addr, size_t addr_len) |
||||||
|
{ |
||||||
|
size_t i; |
||||||
|
unsigned char count = 0; |
||||||
|
|
||||||
|
for (i = 0; i < addr_len; i++) { |
||||||
|
count += ares__count_bits_u8(addr[i]); |
||||||
|
} |
||||||
|
return count; |
||||||
|
} |
||||||
|
|
||||||
|
static ares_status_t ares__iface_ips_enumerate(ares__iface_ips_t *ips, |
||||||
|
const char *name) |
||||||
|
{ |
||||||
|
struct ifaddrs *ifap = NULL; |
||||||
|
struct ifaddrs *ifa = NULL; |
||||||
|
ares_status_t status = ARES_SUCCESS; |
||||||
|
|
||||||
|
if (getifaddrs(&ifap) != 0) { |
||||||
|
status = ARES_EFILE; |
||||||
|
goto done; |
||||||
|
} |
||||||
|
|
||||||
|
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { |
||||||
|
ares__iface_ip_flags_t addrflag = 0; |
||||||
|
struct ares_addr addr; |
||||||
|
unsigned char netmask = 0; |
||||||
|
unsigned int ll_scope = 0; |
||||||
|
|
||||||
|
if (ifa->ifa_addr == NULL) { |
||||||
|
continue; |
||||||
|
} |
||||||
|
|
||||||
|
if (!(ifa->ifa_flags & IFF_UP)) { |
||||||
|
addrflag |= ARES_IFACE_IP_OFFLINE; |
||||||
|
} |
||||||
|
|
||||||
|
if (ifa->ifa_flags & IFF_LOOPBACK) { |
||||||
|
addrflag |= ARES_IFACE_IP_LOOPBACK; |
||||||
|
} |
||||||
|
|
||||||
|
if (ifa->ifa_addr->sa_family == AF_INET) { |
||||||
|
struct sockaddr_in *sockaddr_in = |
||||||
|
(struct sockaddr_in *)((void *)ifa->ifa_addr); |
||||||
|
addr.family = AF_INET; |
||||||
|
memcpy(&addr.addr.addr4, &sockaddr_in->sin_addr, sizeof(addr.addr.addr4)); |
||||||
|
/* netmask */ |
||||||
|
sockaddr_in = (struct sockaddr_in *)((void *)ifa->ifa_netmask); |
||||||
|
netmask = count_addr_bits((const void *)&sockaddr_in->sin_addr, 4); |
||||||
|
} else if (ifa->ifa_addr->sa_family == AF_INET6) { |
||||||
|
struct sockaddr_in6 *sockaddr_in6 = |
||||||
|
(struct sockaddr_in6 *)((void *)ifa->ifa_addr); |
||||||
|
addr.family = AF_INET6; |
||||||
|
memcpy(&addr.addr.addr6, &sockaddr_in6->sin6_addr, |
||||||
|
sizeof(addr.addr.addr6)); |
||||||
|
/* netmask */ |
||||||
|
sockaddr_in6 = (struct sockaddr_in6 *)((void *)ifa->ifa_netmask); |
||||||
|
netmask = count_addr_bits((const void *)&sockaddr_in6->sin6_addr, 16); |
||||||
|
# ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID |
||||||
|
ll_scope = sockaddr_in6->sin6_scope_id; |
||||||
|
# endif |
||||||
|
} else { |
||||||
|
/* unknown */ |
||||||
|
continue; |
||||||
|
} |
||||||
|
|
||||||
|
/* Name mismatch */ |
||||||
|
if (strcasecmp(ifa->ifa_name, name) != 0) { |
||||||
|
continue; |
||||||
|
} |
||||||
|
|
||||||
|
status = ares__iface_ips_add(ips, addrflag, ifa->ifa_name, &addr, netmask, |
||||||
|
ll_scope); |
||||||
|
if (status != ARES_SUCCESS) { |
||||||
|
goto done; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
done: |
||||||
|
freeifaddrs(ifap); |
||||||
|
return status; |
||||||
|
} |
||||||
|
|
||||||
|
#else |
||||||
|
|
||||||
|
static ares_status_t ares__iface_ips_enumerate(ares__iface_ips_t *ips, |
||||||
|
ares__iface_ip_flags_t flags, |
||||||
|
const char *name) |
||||||
|
{ |
||||||
|
(void)ips; |
||||||
|
(void)flags; |
||||||
|
return ARES_ENOTIMP; |
||||||
|
} |
||||||
|
|
||||||
|
#endif |
||||||
|
|
||||||
|
|
||||||
|
unsigned int ares__if_nametoindex(const char *name) |
||||||
|
{ |
||||||
|
#ifdef HAVE_IF_NAMETOINDEX |
||||||
|
return if_nametoindex(name); |
||||||
|
#else |
||||||
|
ares_status_t status; |
||||||
|
ares__iface_ips_t *ips = NULL; |
||||||
|
size_t i; |
||||||
|
unsigned int index = 0; |
||||||
|
|
||||||
|
status = |
||||||
|
ares__iface_ips(&ips, ARES_IFACE_IP_V6 | ARES_IFACE_IP_LINKLOCAL, name); |
||||||
|
if (status != ARES_SUCCESS) { |
||||||
|
goto done; |
||||||
|
} |
||||||
|
|
||||||
|
for (i = 0; i < ares__iface_ips_cnt(ips); i++) { |
||||||
|
if (ares__iface_ips_get_flags(ips, i) & ARES_IFACE_IP_LINKLOCAL) { |
||||||
|
index = ares__iface_ips_get_ll_scope(ips, i); |
||||||
|
goto done; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
done: |
||||||
|
ares__iface_ips_destroy(ips); |
||||||
|
return index; |
||||||
|
#endif |
||||||
|
} |
||||||
|
|
||||||
|
const char *ares__if_indextoname(unsigned int index, char *name, |
||||||
|
size_t name_len) |
||||||
|
{ |
||||||
|
#ifdef HAVE_IF_INDEXTONAME |
||||||
|
if (name_len < IFNAMSIZ) { |
||||||
|
return NULL; |
||||||
|
} |
||||||
|
return if_indextoname(index, name); |
||||||
|
#else |
||||||
|
ares_status_t status; |
||||||
|
ares__iface_ips_t *ips = NULL; |
||||||
|
size_t i; |
||||||
|
const char *ptr = NULL; |
||||||
|
|
||||||
|
if (name_len < IFNAMSIZ) { |
||||||
|
goto done; |
||||||
|
} |
||||||
|
|
||||||
|
if (index == 0) { |
||||||
|
goto done; |
||||||
|
} |
||||||
|
|
||||||
|
status = |
||||||
|
ares__iface_ips(&ips, ARES_IFACE_IP_V6 | ARES_IFACE_IP_LINKLOCAL, NULL); |
||||||
|
if (status != ARES_SUCCESS) { |
||||||
|
goto done; |
||||||
|
} |
||||||
|
|
||||||
|
for (i = 0; i < ares__iface_ips_cnt(ips); i++) { |
||||||
|
if (ares__iface_ips_get_flags(ips, i) & ARES_IFACE_IP_LINKLOCAL && |
||||||
|
ares__iface_ips_get_ll_scope(ips, i) == index) { |
||||||
|
ares_strcpy(name, ares__iface_ips_get_name(ips, i), name_len); |
||||||
|
ptr = name; |
||||||
|
goto done; |
||||||
|
} |
||||||
|
} |
||||||
|
|
||||||
|
done: |
||||||
|
ares__iface_ips_destroy(ips); |
||||||
|
return ptr; |
||||||
|
#endif |
||||||
|
} |
||||||
@ -0,0 +1,139 @@ |
|||||||
|
/* MIT License
|
||||||
|
* |
||||||
|
* Copyright (c) 2023 Brad House |
||||||
|
* |
||||||
|
* Permission is hereby granted, free of charge, to any person obtaining a copy |
||||||
|
* of this software and associated documentation files (the "Software"), to deal |
||||||
|
* in the Software without restriction, including without limitation the rights |
||||||
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
||||||
|
* copies of the Software, and to permit persons to whom the Software is |
||||||
|
* furnished to do so, subject to the following conditions: |
||||||
|
* |
||||||
|
* The above copyright notice and this permission notice (including the next |
||||||
|
* paragraph) shall be included in all copies or substantial portions of the |
||||||
|
* Software. |
||||||
|
* |
||||||
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
||||||
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
||||||
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
||||||
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
||||||
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
||||||
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
||||||
|
* SOFTWARE. |
||||||
|
* |
||||||
|
* SPDX-License-Identifier: MIT |
||||||
|
*/ |
||||||
|
#ifndef __ARES__IFACE_IPS_H |
||||||
|
#define __ARES__IFACE_IPS_H |
||||||
|
|
||||||
|
/*! Flags for interface ip addresses. */ |
||||||
|
typedef enum { |
||||||
|
ARES_IFACE_IP_V4 = 1 << 0, /*!< IPv4 address. During enumeration if
|
||||||
|
* this flag is set ARES_IFACE_IP_V6 |
||||||
|
* is not, will only enumerate v4 |
||||||
|
* addresses. */ |
||||||
|
ARES_IFACE_IP_V6 = 1 << 1, /*!< IPv6 address. During enumeration if
|
||||||
|
* this flag is set ARES_IFACE_IP_V4 |
||||||
|
* is not, will only enumerate v6 |
||||||
|
* addresses. */ |
||||||
|
ARES_IFACE_IP_LOOPBACK = 1 << 2, /*!< Loopback adapter */ |
||||||
|
ARES_IFACE_IP_OFFLINE = 1 << 3, /*!< Adapter offline */ |
||||||
|
ARES_IFACE_IP_LINKLOCAL = 1 << 4, /*!< Link-local ip address */ |
||||||
|
/*! Default, enumerate all ips for online interfaces, including loopback */ |
||||||
|
ARES_IFACE_IP_DEFAULT = (ARES_IFACE_IP_V4 | ARES_IFACE_IP_V6 | |
||||||
|
ARES_IFACE_IP_LOOPBACK | ARES_IFACE_IP_LINKLOCAL) |
||||||
|
} ares__iface_ip_flags_t; |
||||||
|
|
||||||
|
struct ares__iface_ips; |
||||||
|
|
||||||
|
/*! Opaque pointer for holding enumerated interface ip addresses */ |
||||||
|
typedef struct ares__iface_ips ares__iface_ips_t; |
||||||
|
|
||||||
|
/*! Destroy ip address enumeration created by ares__iface_ips().
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
*/ |
||||||
|
void ares__iface_ips_destroy(ares__iface_ips_t *ips); |
||||||
|
|
||||||
|
/*! Enumerate ip addresses on interfaces
|
||||||
|
* |
||||||
|
* \param[out] ips Returns initialized ip address structure |
||||||
|
* \param[in] flags Flags for enumeration |
||||||
|
* \param[in] name Interface name to enumerate, or NULL to enumerate all |
||||||
|
* \return ARES_ENOMEM on out of memory, ARES_ENOTIMP if not supported on |
||||||
|
* the system, ARES_SUCCESS on success |
||||||
|
*/ |
||||||
|
ares_status_t ares__iface_ips(ares__iface_ips_t **ips, |
||||||
|
ares__iface_ip_flags_t flags, const char *name); |
||||||
|
|
||||||
|
/*! Count of ips enumerated
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
* \return count |
||||||
|
*/ |
||||||
|
size_t ares__iface_ips_cnt(const ares__iface_ips_t *ips); |
||||||
|
|
||||||
|
/*! Retrieve interface name
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
* \param[in] idx Index of entry to pull |
||||||
|
* \return interface name |
||||||
|
*/ |
||||||
|
const char *ares__iface_ips_get_name(const ares__iface_ips_t *ips, size_t idx); |
||||||
|
|
||||||
|
/*! Retrieve interface address
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
* \param[in] idx Index of entry to pull |
||||||
|
* \return interface address |
||||||
|
*/ |
||||||
|
const struct ares_addr *ares__iface_ips_get_addr(const ares__iface_ips_t *ips, |
||||||
|
size_t idx); |
||||||
|
|
||||||
|
/*! Retrieve interface address flags
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
* \param[in] idx Index of entry to pull |
||||||
|
* \return interface address flags |
||||||
|
*/ |
||||||
|
ares__iface_ip_flags_t ares__iface_ips_get_flags(const ares__iface_ips_t *ips, |
||||||
|
size_t idx); |
||||||
|
|
||||||
|
/*! Retrieve interface address netmask
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
* \param[in] idx Index of entry to pull |
||||||
|
* \return interface address netmask |
||||||
|
*/ |
||||||
|
unsigned char ares__iface_ips_get_netmask(const ares__iface_ips_t *ips, |
||||||
|
size_t idx); |
||||||
|
|
||||||
|
/*! Retrieve interface ipv6 link local scope
|
||||||
|
* |
||||||
|
* \param[in] ips Initialized IP address enumeration structure |
||||||
|
* \param[in] idx Index of entry to pull |
||||||
|
* \return interface ipv6 link local scope |
||||||
|
*/ |
||||||
|
unsigned int ares__iface_ips_get_ll_scope(const ares__iface_ips_t *ips, |
||||||
|
size_t idx); |
||||||
|
|
||||||
|
|
||||||
|
/*! Retrieve the interface index (aka link local scope) from the interface
|
||||||
|
* name. |
||||||
|
* |
||||||
|
* \param[in] name Interface name |
||||||
|
* \return 0 on failure, index otherwise |
||||||
|
*/ |
||||||
|
unsigned int ares__if_nametoindex(const char *name); |
||||||
|
|
||||||
|
/*! Retrieves the interface name from the index (aka link local scope)
|
||||||
|
* |
||||||
|
* \param[in] index Interface index (> 0) |
||||||
|
* \param[in] name Buffer to hold name |
||||||
|
* \param[in] name_len Length of provided buffer, must be at least IFNAMSIZ |
||||||
|
* \return NULL on failure, or pointer to name on success |
||||||
|
*/ |
||||||
|
const char *ares__if_indextoname(unsigned int index, char *name, |
||||||
|
size_t name_len); |
||||||
|
|
||||||
|
#endif |
||||||
Loading…
Reference in new issue