mirror of
https://codeberg.org/scip/udpxd.git
synced 2025-12-16 11:30:57 +01:00
added v6 support, untested, may not work yet
This commit is contained in:
git@daemon.de
132
host.c
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132
host.c
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/*
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This file is part of udpxd.
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Copyright (C) 2015 T.v.Dein.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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You can contact me by mail: <tom AT vondein DOT org>.
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*/
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#include "host.h"
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/* fill a generic struct depending of what we already know,
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which is easier to pass between functions,
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maybe v4 or v6, filled from existing structs or from strings,
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which create the sockaddr* structs */
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host_t *get_host(char *ip, int port, struct sockaddr_in *v4, struct sockaddr_in6 *v6) {
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host_t *host = malloc(sizeof(host_t));
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host->sock = NULL;
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host->is_v6 = 0;
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host->port = port;
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if(ip != NULL) {
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if(is_v6(ip)) {
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struct sockaddr_in6 *tmp = malloc(sizeof(struct sockaddr_in6));
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memset(tmp, 0, sizeof(struct sockaddr_in6));
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inet_pton(AF_INET6, ip, (struct in6_addr*)&tmp->sin6_addr);
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tmp->sin6_family = AF_INET6;
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tmp->sin6_port = htons( port );
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if (is_linklocal((struct in6_addr*)&tmp->sin6_addr))
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tmp->sin6_scope_id = get_v6_scope(ip);
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else
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tmp->sin6_scope_id = 0;
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host->is_v6 = 1;
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host->sock = (struct sockaddr*)tmp;
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host->size = sizeof(struct sockaddr_in6);
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}
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else {
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struct sockaddr_in *tmp = malloc(sizeof(struct sockaddr_in));
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memset(tmp, 0, sizeof(struct sockaddr_in));
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tmp->sin_family = AF_INET;
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tmp->sin_addr.s_addr = inet_addr( ip );
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tmp->sin_port = htons( port );
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host->sock = (struct sockaddr*)tmp;
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host->size = sizeof(struct sockaddr_in);
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}
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}
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else if(v4 != NULL) {
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struct sockaddr_in *tmp = malloc(sizeof(struct sockaddr_in));
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memcpy(tmp, v4, sizeof(struct sockaddr_in));
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host->ip = malloc(INET_ADDRSTRLEN);
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inet_ntop(AF_INET, (struct in_addr *)&tmp->sin_addr, host->ip, INET_ADDRSTRLEN);
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host->port = ntohs(tmp->sin_port);
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host->sock = (struct sockaddr*)tmp;
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host->size = sizeof(struct sockaddr_in);
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}
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else if(v6 != NULL) {
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struct sockaddr_in6 *tmp = malloc(sizeof(struct sockaddr_in6));
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memcpy(tmp, v6, sizeof(struct sockaddr_in6));
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host->ip = malloc(INET6_ADDRSTRLEN);
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inet_ntop(AF_INET, (struct in6_addr *)&tmp->sin6_addr, host->ip, INET6_ADDRSTRLEN);
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host->port = ntohs(tmp->sin6_port);
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host->sock = (struct sockaddr*)tmp;
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host->is_v6 = 1;
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host->size = sizeof(struct sockaddr_in6);
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}
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else {
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fprintf(stderr, "call invalid!\n");
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exit(1); /* shall not happen */
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}
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return host;
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}
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char *is_v6(char *ip) {
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return strchr(ip, ':');
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}
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/* via http://stackoverflow.com/questions/13504934/binding-sockets-to-ipv6-addresses
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return the interface index (aka scope) of an ipv6 address, which is required
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in order to bind to it.
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*/
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unsigned get_v6_scope(const char *ip){
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struct ifaddrs *addrs, *addr;
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char ipAddress[NI_MAXHOST];
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uint32_t scope=0;
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int i;
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// walk over the list of all interface addresses
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getifaddrs(&addrs);
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for(addr=addrs;addr;addr=addr->ifa_next){
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if (addr->ifa_addr && addr->ifa_addr->sa_family==AF_INET6){ // only interested in ipv6 ones
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getnameinfo(addr->ifa_addr,sizeof(struct sockaddr_in6),ipAddress,sizeof(ipAddress),NULL,0,NI_NUMERICHOST);
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// result actually contains the interface name, so strip it
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for(i=0;ipAddress[i];i++){
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if(ipAddress[i]=='%'){
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ipAddress[i]='\0';
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break;
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}
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}
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// if the ip matches, convert the interface name to a scope index
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if(strcmp(ipAddress,ip)==0){
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scope=if_nametoindex(addr->ifa_name);
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break;
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}
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}
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}
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freeifaddrs(addrs);
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fprintf(stderr, "scope: %d\n", scope);
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return scope;
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}
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/* this is the contents of the makro IN6_IS_ADDR_LINKLOCAL,
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which doesn't compile, when used directly, for whatever reasons */
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int is_linklocal(struct in6_addr *a) {
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return ((a->s6_addr[0] == 0xfe) && ((a->s6_addr[1] & 0xc0) == 0x80));
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}
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54
host.h
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54
host.h
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@@ -0,0 +1,54 @@
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/*
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This file is part of udpxd.
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Copyright (C) 2015 T.v.Dein.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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You can contact me by mail: <tom AT vondein DOT org>.
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*/
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#ifndef _HAVE_HOST_H
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#define _HAVE_HOST_H
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <net/if.h> // if_nametoindex()
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#include <ifaddrs.h>
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struct _host_t {
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int is_v6;
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struct sockaddr *sock;
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size_t size;
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char *ip;
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int port;
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};
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typedef struct _host_t host_t;
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unsigned get_v6_scope(const char *ip);
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int is_linklocal(struct in6_addr *a);
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host_t *get_host(char *ip, int port, struct sockaddr_in *v4, struct sockaddr_in6 *v6);
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char *is_v6(char *ip);
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#endif
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