diff options
| -rw-r--r-- | src/dhcpv6-ia.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c index f933da6..37b7cc8 100644 --- a/src/dhcpv6-ia.c +++ b/src/dhcpv6-ia.c @@ -33,6 +33,7 @@ static void update(struct interface *iface); static void reconf_timer(struct uloop_timeout *event); static struct uloop_timeout reconf_event = {.cb = reconf_timer}; static uint32_t serial = 0; +static uint8_t statemd5[16]; int dhcpv6_ia_init(void) @@ -187,6 +188,9 @@ static int send_reconf(struct interface *iface, struct dhcpv6_assignment *assign void dhcpv6_write_statefile(void) { + md5_ctx_t md5; + md5_begin(&md5); + if (config.dhcp_statefile) { time_t now = odhcpd_time(), wall_time = time(NULL); int fd = open(config.dhcp_statefile, O_CREAT | O_WRONLY | O_CLOEXEC, 0644); @@ -238,8 +242,11 @@ void dhcpv6_write_statefile(void) addr.s6_addr32[1] |= htonl(c->assigned); inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1); - if (c->length == 128 && c->hostname && i == 0) + if (c->length == 128 && c->hostname && i == 0) { fprintf(fp, "%s\t%s\n", ipbuf, c->hostname); + md5_hash(ipbuf, strlen(ipbuf), &md5); + md5_hash(c->hostname, strlen(c->hostname), &md5); + } l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, c->length); } @@ -267,8 +274,11 @@ void dhcpv6_write_statefile(void) struct in_addr addr = {htonl(c->addr)}; inet_ntop(AF_INET, &addr, ipbuf, sizeof(ipbuf) - 1); - if (c->hostname[0]) + if (c->hostname[0]) { fprintf(fp, "%s\t%s\n", ipbuf, c->hostname); + md5_hash(ipbuf, strlen(ipbuf), &md5); + md5_hash(c->hostname, strlen(c->hostname), &md5); + } l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/32 ", ipbuf); leasebuf[l - 1] = '\n'; @@ -280,7 +290,11 @@ void dhcpv6_write_statefile(void) fclose(fp); } - if (config.dhcp_cb) { + uint8_t newmd5[16]; + md5_end(newmd5, &md5); + + if (config.dhcp_cb && memcmp(newmd5, statemd5, sizeof(newmd5))) { + memcpy(statemd5, newmd5, sizeof(statemd5)); char *argv[2] = {config.dhcp_cb, NULL}; if (!vfork()) { execv(argv[0], argv); |