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gluon-mesh-babel: babel-respond: stop relying on mac addresses and instead obtain ll-address from nic

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This commit is contained in:
Christof Schulze 2018-09-03 00:52:30 +02:00
parent bd96bd4024
commit c23e6e4b53
1 changed files with 35 additions and 51 deletions
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86
package/gluon-mesh-babel/src/respondd.c
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@ -47,6 +47,7 @@
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <ifaddrs.h>
#include <linux/ethtool.h>
#include <linux/if_addr.h>
@ -78,30 +79,41 @@
static struct babelhelper_ctx bhelper_ctx = {};
static int obtain_ifmac(unsigned char *ifmac, const char *ifname) {
struct ifreq ifr = {};
int sock;
static void obtain_if_addr(const char *ifname, char *lladdr) {
struct ifaddrs *ifaddr, *ifa;
int family, n;
sock=socket(PF_INET, SOCK_STREAM, 0);
if (-1==sock) {
perror("socket() ");
return 1;
if (getifaddrs(&ifaddr) == -1) {
perror("getifaddrs");
exit(EXIT_FAILURE);
}
strncpy(ifr.ifr_name, ifname, IFNAMSIZ-1);
for (ifa = ifaddr, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
if (ifa->ifa_addr == NULL)
continue;
printf("obtaining hw address for nic: %s %s\n", ifname, ifr.ifr_name);
if (-1==ioctl(sock, SIOCGIFHWADDR, &ifr)) {
perror("ioctl(SIOCGIFHWADDR) ");
close(sock);
return 1;
family = ifa->ifa_addr->sa_family;
if ( (family == AF_INET6) && ( ! strncmp(ifname, ifa->ifa_name, strlen(ifname)) ) ) {
char lhost[INET6_ADDRSTRLEN];
struct in6_addr *address = &((struct sockaddr_in6*)ifa->ifa_addr)->sin6_addr;
if (inet_ntop(AF_INET6, address, lhost, INET6_ADDRSTRLEN) == NULL) {
fprintf(stderr, "obtain_if_addr: could not convert ip to string\n");
goto cleanup;
}
if (! strncmp("fe80:", lhost, 5) ) {
snprintf( lladdr, NI_MAXHOST, "%s", lhost );
goto cleanup;
}
}
}
close(sock);
memcpy(ifmac, ifr.ifr_hwaddr.sa_data, 6);
return 0;
cleanup:
freeifaddrs(ifaddr);
}
static char* get_line_from_run(const char* command) {
FILE *fp;
char *line = NULL;
@ -167,34 +179,11 @@ static bool interface_file_exists(const char *ifname, const char *name) {
return !access(path, F_OK);
}
struct in6_addr mac2ipv6(uint8_t mac[6], char * prefix) {
struct in6_addr address = {};
inet_pton(AF_INET6, prefix, &address);
address.s6_addr[8] = mac[0] ^ 0x02;
address.s6_addr[9] = mac[1];
address.s6_addr[10] = mac[2];
address.s6_addr[11] = 0xff;
address.s6_addr[12] = 0xfe;
address.s6_addr[13] = mac[3];
address.s6_addr[14] = mac[4];
address.s6_addr[15] = mac[5];
return address;
}
static void mesh_add_if(const char *ifname, struct json_object *wireless,
struct json_object *tunnel, struct json_object *other) {
char str_ip[INET6_ADDRSTRLEN] = {};
unsigned char mac[6] = {};
char str_ip[NI_MAXHOST] = {};
if (obtain_ifmac(mac, ifname)) {
printf("could not obtain mac for device: %s", ifname);
return;
}
struct in6_addr lladdr = mac2ipv6(mac, "fe80::");
inet_ntop(AF_INET6, &lladdr.s6_addr, str_ip, INET6_ADDRSTRLEN);
obtain_if_addr(ifname, str_ip);
struct json_object *address = json_object_new_string(str_ip);
@ -206,6 +195,8 @@ static void mesh_add_if(const char *ifname, struct json_object *wireless,
json_object_array_add(other, address);
}
static bool handle_neighbour(char **data, void *obj) {
if (data[NEIGHBOUR]) {
struct json_object *neigh = json_object_new_object();
@ -221,18 +212,11 @@ static bool handle_neighbour(char **data, void *obj) {
struct json_object *nif = 0;
if (data[IF] && !json_object_object_get_ex(obj, data[IF], &nif)) {
char str_ip[NI_MAXHOST] = {};
obtain_if_addr( (const char*)data[IF], str_ip );
nif = json_object_new_object();
unsigned char ifmac[6] = {};
char str_ip[INET6_ADDRSTRLEN] = {};
if (obtain_ifmac(ifmac, (const char*)data[IF])) {
printf("could not obtain mac for device: %s", data[IF]);
return false;
}
struct in6_addr lladdr = mac2ipv6(ifmac, "fe80::");
inet_ntop(AF_INET6, &lladdr.s6_addr, str_ip, INET6_ADDRSTRLEN);
json_object_object_add(nif, "ll-addr", json_object_new_string(str_ip));
json_object_object_add(nif, "protocol", json_object_new_string("babel"));
json_object_object_add(obj, data[IF], nif);