libifupdown: add initial interface management code
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parent
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commit
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3 changed files with 285 additions and 1 deletions
3
Makefile
3
Makefile
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@ -3,7 +3,8 @@ CFLAGS := -ggdb3 -O2 -Wall -I.
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LIBIFUPDOWN_SRC = \
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libifupdown/list.c \
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libifupdown/dict.c
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libifupdown/dict.c \
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libifupdown/interface.c
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LIBIFUPDOWN_OBJ = ${LIBIFUPDOWN_SRC:.c=.o}
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209
libifupdown/interface.c
Normal file
209
libifupdown/interface.c
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@ -0,0 +1,209 @@
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/*
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* libifupdown/interface.c
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* Purpose: interface management
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*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or 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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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "libifupdown/interface.h"
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bool
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lif_address_parse(struct lif_address *address, const char *presentation)
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{
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char buf[512], *netmask_p;
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strlcpy(buf, presentation, sizeof buf);
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address->domain = strchr(buf, ':') != NULL ? AF_INET6 : AF_INET;
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netmask_p = strrchr(buf, '/');
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if (netmask_p != NULL)
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{
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*netmask_p++ = '\0';
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address->netmask = strtol(netmask_p, NULL, 10);
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}
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else
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address->netmask = 0;
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return !!inet_pton(address->domain, buf, address->addr_buf);
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}
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bool
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lif_address_unparse(const struct lif_address *address, char *buf, size_t buflen, bool with_netmask)
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{
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char workbuf[512] = {};
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if (!inet_ntop(address->domain, address->addr_buf, workbuf, sizeof workbuf))
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return false;
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if (!with_netmask || !address->netmask)
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{
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strlcpy(buf, workbuf, buflen);
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return true;
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}
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snprintf(buf, buflen, "%s/%zu", workbuf, address->netmask);
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return true;
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}
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void
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lif_interface_init(struct lif_interface *interface, const char *ifname)
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{
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memset(interface, '\0', sizeof *interface);
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interface->ifname = strdup(ifname);
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}
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bool
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lif_interface_address_add(struct lif_interface *interface, const char *address)
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{
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struct lif_address *addr = calloc(1, sizeof *addr);
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if (!lif_address_parse(addr, address))
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{
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free(addr);
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return false;
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}
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lif_dict_add(&interface->vars, "address", addr);
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return true;
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}
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void
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lif_interface_address_delete(struct lif_interface *interface, const char *address)
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{
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struct lif_node *iter, *iter_next;
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struct lif_address addr;
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if (!lif_address_parse(&addr, address))
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return;
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LIF_DICT_FOREACH_SAFE(iter, iter_next, &interface->vars)
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{
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struct lif_dict_entry *entry = iter->data;
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if (strcmp(entry->key, "address"))
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continue;
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struct lif_address *entry_addr = entry->data;
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char addr_buf[512] = {};
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if (!lif_address_unparse(entry_addr, addr_buf, sizeof addr_buf, addr.netmask != 0))
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continue;
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if (strcmp(addr_buf, address))
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continue;
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lif_dict_delete_entry(&interface->vars, entry);
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free(entry_addr);
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}
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}
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void
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lif_interface_fini(struct lif_interface *interface)
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{
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struct lif_node *iter, *iter_next;
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LIF_DICT_FOREACH_SAFE(iter, iter_next, &interface->vars)
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{
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struct lif_dict_entry *entry = iter->data;
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free(entry->data);
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lif_dict_delete_entry(&interface->vars, entry);
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}
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free(interface->ifname);
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}
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void
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lif_interface_collection_init(struct lif_dict *collection)
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{
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struct lif_interface *if_lo;
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memset(collection, '\0', sizeof *collection);
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/* always enable loopback interface as part of a collection */
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if_lo = lif_interface_collection_find(collection, "lo");
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if_lo->is_auto = if_lo->is_loopback = true;
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lif_interface_address_add(if_lo, "127.0.0.1/8");
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}
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void
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lif_interface_collection_fini(struct lif_dict *collection)
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{
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struct lif_node *iter, *iter_next;
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LIF_DICT_FOREACH_SAFE(iter, iter_next, collection)
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{
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struct lif_dict_entry *entry = iter->data;
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struct lif_interface *iface = entry->data;
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lif_interface_fini(iface);
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free(iface);
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lif_dict_delete_entry(collection, entry);
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}
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}
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struct lif_interface *
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lif_interface_collection_find(struct lif_dict *collection, const char *ifname)
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{
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struct lif_dict_entry *entry = lif_dict_find(collection, ifname);
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if (entry == NULL)
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{
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struct lif_interface *iface = calloc(1, sizeof *iface);
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lif_interface_init(iface, ifname);
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lif_dict_add(collection, ifname, iface);
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return iface;
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}
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return entry->data;
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}
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struct lif_interface *
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lif_interface_collection_upsert(struct lif_dict *collection, struct lif_interface *interface)
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{
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struct lif_dict_entry *entry = lif_dict_find(collection, interface->ifname);
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if (entry == NULL)
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{
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lif_dict_add(collection, interface->ifname, interface);
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return interface;
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}
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if (entry->data == interface)
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return interface;
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lif_interface_collection_delete(collection, entry->data);
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lif_dict_add(collection, interface->ifname, interface);
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return interface;
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}
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void
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lif_interface_collection_delete(struct lif_dict *collection, struct lif_interface *interface)
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{
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struct lif_dict_entry *entry = lif_dict_find(collection, interface->ifname);
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if (entry == NULL)
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return;
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lif_interface_fini(interface);
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free(interface);
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lif_dict_delete_entry(collection, entry);
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}
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74
libifupdown/interface.h
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74
libifupdown/interface.h
Normal file
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@ -0,0 +1,74 @@
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/*
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* libifupdown/interface.h
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* Purpose: interface management
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*
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* Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or 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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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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#ifndef LIBIFUPDOWN_INTERFACE_H__GUARD
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#define LIBIFUPDOWN_INTERFACE_H__GUARD
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#include <arpa/inet.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include "libifupdown/dict.h"
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/*
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* Addresses are stored in a buffer with netmask and type.
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*/
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struct lif_address {
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unsigned char addr_buf[sizeof(struct in6_addr)];
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size_t netmask;
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int domain;
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};
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extern bool lif_address_parse(struct lif_address *address, const char *presentation);
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extern bool lif_address_unparse(const struct lif_address *address, char *buf, size_t buflen, bool with_netmask);
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/*
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* Interfaces are contained in a dictionary, with the interfaces mapped by
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* interface name to their `struct lif_interface`.
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*
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* Interfaces are simply upserted as needed. This allows for `auto eth0`
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* to create a placeholder `struct lif_interface` with auto set to true.
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*
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* Configuration variables are simply stored in a `struct lif_dict`, which
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* can act as a multidict.
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*/
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struct lif_interface {
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char *ifname;
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bool is_dhcp;
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bool is_loopback;
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bool is_auto;
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struct lif_dict vars;
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};
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#define LIF_INTERFACE_COLLECTION_FOREACH(iter, collection) \
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LIF_DICT_FOREACH((iter), (collection))
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#define LIF_INTERFACE_COLLECTION_FOREACH_SAFE(iter, iter_next, collection) \
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LIF_DICT_FOREACH_SAFE((iter), (iter_next), (collection))
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extern void lif_interface_init(struct lif_interface *interface, const char *ifname);
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extern bool lif_interface_address_add(struct lif_interface *interface, const char *address);
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extern void lif_interface_address_delete(struct lif_interface *interface, const char *address);
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extern void lif_interface_fini(struct lif_interface *interface);
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extern void lif_interface_collection_init(struct lif_dict *collection);
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extern void lif_interface_collection_fini(struct lif_dict *collection);
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extern struct lif_interface *lif_interface_collection_find(struct lif_dict *collection, const char *ifname);
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extern struct lif_interface *lif_interface_collection_upsert(struct lif_dict *collection, struct lif_interface *interface);
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extern void lif_interface_collection_delete(struct lif_dict *collection, struct lif_interface *interface);
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#endif
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