ead: add support for instance ids to prevent interference from packet reception on multiple interfaces
SVN-Revision: 13905
This commit is contained in:
Felix Fietkau
parent
341c1dbdf5
commit
4129203d75
@ -62,6 +62,7 @@ static struct t_num *A, B;
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static struct t_preconf *tcp;
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static int auth_type = EAD_AUTH_DEFAULT;
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static int timeout = EAD_TIMEOUT;
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static uint16_t sid = 0;
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static void
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set_nonblock(int enable)
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@ -157,6 +158,7 @@ handle_pong(void)
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auth_type = ntohs(pong->auth_type);
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if (nid == 0xffff)
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printf("%04x: %s\n", ntohs(msg->nid), pong->name);
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sid = msg->sid;
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return true;
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}
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@ -320,7 +322,7 @@ int main(int argc, char **argv)
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int ch;
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msg->magic = htonl(EAD_MAGIC);
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msg->tid = 0;
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msg->sid = 0;
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memset(&local, 0, sizeof(local));
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memset(&remote, 0, sizeof(remote));
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@ -65,10 +65,20 @@
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#define DEBUG(n, format, ...) do {} while(0)
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#endif
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struct ead_instance {
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struct list_head list;
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char ifname[16];
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int pid;
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char id;
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#ifdef linux
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char bridge[16];
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bool br_check;
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#endif
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};
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static char ethmac[6] = "\x00\x13\x37\x00\x00\x00"; /* last 3 bytes will be randomized */
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static pcap_t *pcap_fp = NULL;
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static pcap_t *pcap_fp_rx = NULL;
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static const char *ifname = DEFAULT_IFNAME;
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static char pktbuf_b[PCAP_MRU];
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static struct ead_packet *pktbuf = (struct ead_packet *)pktbuf_b;
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static u16_t nid = 0xffff; /* node id */
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@ -85,20 +95,7 @@ static unsigned char pw_saltbuf[MAXSALTLEN];
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static struct list_head instances;
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static const char *dev_name = DEFAULT_DEVNAME;
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static bool nonfork = false;
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#ifdef linux
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static const char *brname = NULL;
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#endif
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struct ead_instance {
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struct list_head list;
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char name[16];
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int pid;
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#ifdef linux
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char bridge[16];
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bool br_check;
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#endif
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};
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static struct ead_instance *instance = NULL;
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static struct t_pwent tpe = {
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.name = username,
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@ -113,6 +110,20 @@ static struct t_server *ts = NULL;
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static struct t_num A, *B = NULL;
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unsigned char *skey;
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static void
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get_random_bytes(void *ptr, int len)
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{
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int fd;
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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perror("open");
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exit(1);
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}
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read(fd, ptr, len);
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close(fd);
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}
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static bool
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prepare_password(void)
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{
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@ -539,6 +550,11 @@ parse_message(struct ead_packet *pkt, int len)
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(state != type))
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return;
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if ((type != EAD_TYPE_PING) &&
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((ntohs(pkt->msg.sid) & EAD_INSTANCE_MASK) >>
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EAD_INSTANCE_SHIFT) != instance->id)
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return;
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switch(type) {
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case EAD_TYPE_PING:
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handler = handle_ping;
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@ -574,6 +590,7 @@ parse_message(struct ead_packet *pkt, int len)
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pktbuf->msg.magic = htonl(EAD_MAGIC);
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pktbuf->msg.type = htonl(type + 1);
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pktbuf->msg.nid = htons(nid);
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pktbuf->msg.sid = pkt->msg.sid;
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pktbuf->msg.len = 0;
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if (handler(pkt, len, &nstate)) {
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@ -630,16 +647,16 @@ ead_pcap_reopen(bool first)
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pcap_fp_rx = NULL;
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do {
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pcap_fp = pcap_open_live(ifname, PCAP_MRU, 1, PCAP_TIMEOUT, errbuf);
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pcap_fp = pcap_open_live(instance->ifname, PCAP_MRU, 1, PCAP_TIMEOUT, errbuf);
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#ifdef linux
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if (brname)
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pcap_fp_rx = pcap_open_live(brname, PCAP_MRU, 1, PCAP_TIMEOUT, errbuf);
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if (instance->bridge[0])
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pcap_fp_rx = pcap_open_live(instance->bridge, PCAP_MRU, 1, PCAP_TIMEOUT, errbuf);
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#endif
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if (!pcap_fp_rx)
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pcap_fp_rx = pcap_fp;
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pcap_setfilter(pcap_fp_rx, &pktfilter);
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if (first && !pcap_fp) {
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DEBUG(1, "WARNING: unable to open interface '%s'\n", ifname);
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DEBUG(1, "WARNING: unable to open interface '%s'\n", instance->ifname);
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first = false;
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}
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if (!pcap_fp)
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@ -712,12 +729,8 @@ start_server(struct ead_instance *i)
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}
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}
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instance = i;
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signal(SIGCHLD, instance_handle_sigchld);
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ifname = i->name;
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#ifdef linux
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if (i->bridge[0])
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brname = i->bridge;
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#endif
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ead_pcap_reopen(true);
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ead_pktloop();
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pcap_close(pcap_fp);
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@ -779,7 +792,7 @@ check_bridge_port(const char *br, const char *port, void *arg)
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list_for_each(p, &instances) {
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in = list_entry(p, struct ead_instance, list);
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if (strcmp(in->name, port) != 0)
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if (strcmp(in->ifname, port) != 0)
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continue;
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in->br_check = true;
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@ -787,7 +800,7 @@ check_bridge_port(const char *br, const char *port, void *arg)
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break;
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strncpy(in->bridge, br, sizeof(in->bridge));
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DEBUG(2, "assigning port %s to bridge %s\n", in->name, in->bridge);
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DEBUG(2, "assigning port %s to bridge %s\n", in->ifname, in->bridge);
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stop_server(in, false);
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}
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return 0;
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@ -817,7 +830,7 @@ check_all_interfaces(void)
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if (in->br_check) {
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in->br_check = false;
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} else if (in->bridge[0]) {
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DEBUG(2, "removing port %s from bridge %s\n", in->name, in->bridge);
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DEBUG(2, "removing port %s from bridge %s\n", in->ifname, in->bridge);
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in->bridge[0] = 0;
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stop_server(in, false);
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}
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@ -830,10 +843,10 @@ int main(int argc, char **argv)
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{
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struct ead_instance *in;
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struct timeval tv;
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int fd, ch;
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const char *pidfile = NULL;
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bool background = false;
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int n_iface = 0;
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int fd, ch;
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if (argc == 1)
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return usage(argv[0]);
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@ -853,9 +866,9 @@ int main(int argc, char **argv)
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in = malloc(sizeof(struct ead_instance));
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memset(in, 0, sizeof(struct ead_instance));
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INIT_LIST_HEAD(&in->list);
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strncpy(in->name, optarg, sizeof(in->name) - 1);
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strncpy(in->ifname, optarg, sizeof(in->ifname) - 1);
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list_add(&in->list, &instances);
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n_iface++;
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in->id = n_iface++;
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break;
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case 'D':
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dev_name = optarg;
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@ -902,13 +915,7 @@ int main(int argc, char **argv)
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}
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/* randomize the mac address */
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0) {
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perror("open");
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exit(1);
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}
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read(fd, ethmac + 3, 3);
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close(fd);
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get_random_bytes(ethmac + 3, 3);
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nid = *(((u16_t *) ethmac) + 2);
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start_servers(false);
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@ -114,12 +114,16 @@ struct ead_msg_encrypted {
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#define EAD_DATA(_msg, _type) (&((_msg)->data[0]._type))
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#define EAD_ENC_DATA(_msg, _type) (&((_msg)->data[0].enc.data[0]._type))
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/* for ead_msg::sid */
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#define EAD_INSTANCE_MASK 0xf000
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#define EAD_INSTANCE_SHIFT 12
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struct ead_msg {
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uint32_t magic;
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uint32_t len;
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uint32_t type;
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uint16_t nid; /* node id */
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uint16_t tid; /* transaction id */
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uint16_t sid; /* session id */
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uint32_t ip; /* source ip for responses from the server */
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union {
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struct ead_msg_pong pong;
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