Server unicast option support

[odhcp6c.git] / src / odhcp6c.c

diff --git a/src/odhcp6c.c b/src/odhcp6c.c
index 506239d2205824b7ae70fc050f0f44f1843737b1..460f230fb3811cac66305ce6467455f40bd313bd 100644 (file)
--- a/src/odhcp6c.c
+++ b/src/odhcp6c.c
@@ -14,6 +14,7 @@
 
 #include <time.h>
 #include <errno.h>
+#include <ctype.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -22,16 +23,27 @@
 #include <syslog.h>
 #include <signal.h>
 #include <string.h>
+#include <strings.h>
 #include <stdbool.h>
 
 #include <net/if.h>
 #include <sys/wait.h>
 #include <sys/syscall.h>
 #include <arpa/inet.h>
+#include <linux/if_addr.h>
 
 #include "odhcp6c.h"
 #include "ra.h"
 
+#ifdef EXT_BFD_PING
+#include "bfd.h"
+#endif
+
+#ifndef IN6_IS_ADDR_UNIQUELOCAL
+#define IN6_IS_ADDR_UNIQUELOCAL(a) \
+       ((((__const uint32_t *) (a))[0] & htonl (0xfe000000)) \
+        == htonl (0xfc000000))
+#endif
 
 static void sighandler(int signal);
 static int usage(void);
@@ -43,7 +55,7 @@ static volatile int do_signal = 0;
 static int urandom_fd = -1, allow_slaac_only = 0;
 static bool bound = false, release = true;
 static time_t last_update = 0;
-
+static char *ifname = NULL;
 
 int main(_unused int argc, char* const argv[])
 {
@@ -59,10 +71,14 @@ int main(_unused int argc, char* const argv[])
        static struct in6_addr ifid = IN6ADDR_ANY_INIT;
        int sol_timeout = 120;
 
+#ifdef EXT_BFD_PING
+       int bfd_interval = 0, bfd_loss = 3;
+#endif
+
        bool help = false, daemonize = false;
        int logopt = LOG_PID;
        int c, request_pd = 0;
-       while ((c = getopt(argc, argv, "S::N:P:Fc:i:r:s:kt:hedp:")) != -1) {
+       while ((c = getopt(argc, argv, "S::N:P:FB:c:i:r:s:kt:hedp:")) != -1) {
                switch (c) {
                case 'S':
                        allow_slaac_only = (optarg) ? atoi(optarg) : -1;
@@ -89,7 +105,6 @@ int main(_unused int argc, char* const argv[])
                        if (request_pd == 0)
                                request_pd = -1;
 
-                       ia_pd_mode = IA_MODE_TRY;
                        break;
 
                case 'F':
@@ -97,6 +112,12 @@ int main(_unused int argc, char* const argv[])
                        ia_pd_mode = IA_MODE_FORCE;
                        break;
 
+#ifdef EXT_BFD_PING
+               case 'B':
+                       bfd_interval = atoi(optarg);
+                       break;
+#endif
+
                case 'c':
                        l = script_unhexlify(&buf[4], sizeof(buf) - 4, optarg);
                        if (l > 0) {
@@ -158,7 +179,7 @@ int main(_unused int argc, char* const argv[])
        }
 
        openlog("odhcp6c", logopt, LOG_DAEMON);
-       const char *ifname = argv[optind];
+       ifname = argv[optind];
 
        if (help || !ifname)
                return usage();
@@ -263,6 +284,10 @@ int main(_unused int argc, char* const argv[])
                script_call("bound");
                bound = true;
                syslog(LOG_NOTICE, "entering stateful-mode on %s", ifname);
+#ifdef EXT_BFD_PING
+               if (bfd_interval > 0)
+                       bfd_start(ifname, bfd_loss, bfd_interval);
+#endif
 
                while (do_signal == 0 || do_signal == SIGUSR1) {
                        // Renew Cycle
@@ -312,6 +337,10 @@ int main(_unused int argc, char* const argv[])
                                script_call("rebound");
                }
 
+#ifdef EXT_BFD_PING
+               bfd_stop();
+#endif
+
 
                size_t ia_pd_len, ia_na_len, server_id_len;
                odhcp6c_get_state(STATE_IA_PD, &ia_pd_len);
@@ -343,6 +372,9 @@ static int usage(void)
        "       -N <mode>       Mode for requesting addresses [try|force|none]\n"
        "       -P <length>     Request IPv6-Prefix (0 = auto)\n"
        "       -F              Force IPv6-Prefix\n"
+#ifdef EXT_BFD_PING
+       "       -B <interval>   Enable BFD ping check\n"
+#endif
        "       -c <clientid>   Override client-ID (base-16 encoded)\n"
        "       -i <iface-id>   Use a custom interface identifier for RA handling\n"
        "       -r <options>    Options to be requested (comma-separated)\n"
@@ -392,10 +424,17 @@ bool odhcp6c_signal_process(void)
                do_signal = 0;
                bool ra_updated = ra_process();
 
+               if (ra_link_up())
+                       do_signal = SIGUSR2;
+
                if (ra_updated && (bound || allow_slaac_only == 0))
                        script_call("ra-updated"); // Immediate process urgent events
                else if (ra_updated && !bound && allow_slaac_only > 0)
                        script_delay_call("ra-updated", allow_slaac_only);
+
+#ifdef EXT_BFD_PING
+               bfd_receive();
+#endif
        }
 
        return do_signal != 0;
@@ -554,11 +593,64 @@ void odhcp6c_random(void *buf, size_t len)
        read(urandom_fd, buf, len);
 }
 
+
 bool odhcp6c_is_bound(void)
 {
        return bound;
 }
 
+
+bool odhcp6c_addr_in_scope(const struct in6_addr *addr)
+{
+       FILE *fd = fopen("/proc/net/if_inet6", "r");
+       int len;
+       char buf[256];
+
+       if (fd == NULL)
+               return false;
+
+       while (fgets(buf, sizeof(buf), fd)) {
+               struct in6_addr inet6_addr;
+               uint32_t flags, dummy;
+               unsigned int i;
+               char name[8], addr_buf[32];
+
+               len = strlen(buf);
+
+               if ((len <= 0) || buf[len - 1] != '\n')
+                       return false;
+
+               buf[--len] = '\0';
+
+               if (sscanf(buf, "%s %x %x %x %x %s",
+                               addr_buf, &dummy, &dummy, &dummy, &flags, name) != 6)
+                       return false;
+
+               if (strcmp(name, ifname) ||
+                       (flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE | IFA_F_DEPRECATED)))
+                       continue;
+
+               for (i = 0; i < sizeof(addr_buf); i++) {
+                       if (!isxdigit(addr_buf[i]) || isupper(addr_buf[i]))
+                               return false;
+               }
+
+               memset(&inet6_addr, 0, sizeof(inet6_addr));
+               for (i = 0; i < (sizeof(addr_buf) / 2); i++) {
+                       unsigned char byte;
+                       static const char hex[] = "0123456789abcdef";
+                       byte = ((index(hex, addr_buf[i * 2]) - hex) << 4) |
+                               (index(hex, addr_buf[i * 2 + 1]) - hex);
+                       inet6_addr.s6_addr[i] = byte;
+               }
+
+               if ((IN6_IS_ADDR_LINKLOCAL(&inet6_addr) == IN6_IS_ADDR_LINKLOCAL(addr)) &&
+                       (IN6_IS_ADDR_UNIQUELOCAL(&inet6_addr) == IN6_IS_ADDR_UNIQUELOCAL(addr)))
+                       return true;
+       }
+       return false;
+}
+
 static void sighandler(int signal)
 {
        if (signal == SIGCHLD)