When assigned a static prefix, it is desirable to also have
a static IP, however, the link-local address assigned from
the provider during ipv6cp may change on each connection.
This option solves this problem - for example, you can
append -H '::1' to the odhcp6c command line.
---
src/odhcp6c.c | 10 ++++++++--
src/ra.c | 23 +++++++++++++----------
src/ra.h | 2 +-
3 files changed, 22 insertions(+), 13 deletions(-)
diff --git a/src/odhcp6c.c b/src/odhcp6c.c
index 4fefcd7..04b2c6b 100644
--- a/src/odhcp6c.c
+++ b/src/odhcp6c.c
@@ -50,6 +50,7 @@ int main(_unused int argc, char* const argv[])
// Allocate ressources
const char *pidfile = NULL;
const char *script = "/usr/sbin/odhcp6c-update";
+ const char *hostid = NULL;
ssize_t l;
uint8_t buf[134];
char *optpos;
@@ -59,7 +60,7 @@ int main(_unused int argc, char* const argv[])
bool help = false, daemonize = false;
int logopt = LOG_PID;
int c, request_pd = 0;
- while ((c = getopt(argc, argv, "S::N:P:c:r:s:khedp:")) != -1) {
+ while ((c = getopt(argc, argv, "S::N:P:c:H:r:s:khedp:")) != -1) {
switch (c) {
case 'S':
allow_slaac_only = (optarg) ? atoi(optarg) : -1;
@@ -98,6 +99,10 @@ int main(_unused int argc, char* const argv[])
}
break;
+ case 'H':
+ hostid = optarg;
+ break;
+
case 'r':
optpos = optarg;
while (optpos[0]) {
@@ -151,7 +156,7 @@ int main(_unused int argc, char* const argv[])
signal(SIGUSR2, sighandler);
if ((urandom_fd = open("/dev/urandom", O_CLOEXEC | O_RDONLY)) < 0 ||
- init_dhcpv6(ifname, request_pd) || ra_init(ifname) ||
+ init_dhcpv6(ifname, request_pd) || ra_init(ifname,
hostid) ||
script_init(script, ifname)) {
syslog(LOG_ERR, "failed to initialize: %s", strerror(errno));
return 3;
@@ -314,6 +319,7 @@ static int usage(void)
" -N <mode> Mode for requesting addresses
[try|force|none]\n"
" -P <length> Request IPv6-Prefix (0 = auto)\n"
" -c <clientid> Override client-ID (base-16 encoded)\n"
+ " -H <hostid> Override host id with the given IPv6 address\n"
" -r <options> Options to be requested (comma-separated)\n"
" -s <script> Status update script
(/usr/sbin/odhcp6c-update)\n"
" -k Don't send a RELEASE when stopping\n"
diff --git a/src/ra.c b/src/ra.c
index b1526ae..be37b2d 100644
--- a/src/ra.c
+++ b/src/ra.c
@@ -42,7 +42,7 @@ static struct in6_addr lladdr = IN6ADDR_ANY_INIT;
static void ra_send_rs(int signal __attribute__((unused)));
-int ra_init(const char *ifname)
+int ra_init(const char *ifname, const char *hostid)
{
sock = socket(AF_INET6, SOCK_RAW | SOCK_CLOEXEC, IPPROTO_ICMPV6);
if_index = if_nametoindex(ifname);
@@ -74,17 +74,20 @@ int ra_init(const char *ifname)
fcntl(sock, F_SETOWN, ourpid);
fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_ASYNC);
- // Get LL-addr
- FILE *fp = fopen("/proc/net/if_inet6", "r");
- if (fp) {
- char addrbuf[33], ifbuf[16];
- while (fscanf(fp, "%32s %*x %*x %*x %*x %15s", addrbuf, ifbuf)
== 2) {
- if (!strcmp(ifbuf, if_name)) {
- script_unhexlify((uint8_t*)&lladdr,
sizeof(lladdr), addrbuf);
- break;
+ // Use hostid if -H was specified
+ if(hostid == NULL || inet_pton(AF_INET6, hostid, &lladdr) != 1) {
+ // Get LL-addr if -H was missing or inet_pton failed
+ FILE *fp = fopen("/proc/net/if_inet6", "r");
+ if (fp) {
+ char addrbuf[33], ifbuf[16];
+ while (fscanf(fp, "%32s %*x %*x %*x %*x %15s", addrbuf,
ifbuf) == 2) {
+ if (!strcmp(ifbuf, if_name)) {
+ script_unhexlify((uint8_t*)&lladdr,
sizeof(lladdr), addrbuf);
+ break;
+ }
}
+ fclose(fp);
}
- fclose(fp);
}
// Open rtnetlink socket
diff --git a/src/ra.h b/src/ra.h
index f87c4f7..5a37694 100644
--- a/src/ra.h
+++ b/src/ra.h
@@ -34,6 +34,6 @@ struct icmpv6_opt {
(void*)(opt + opt->len) <= (void*)(end); opt += opt->len)
-int ra_init(const char *ifname);
+int ra_init(const char *ifname, const char *hostid);
bool ra_process(void);
bool ra_rtnl_process(void);
--
1.8.3.1
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