/**
* Copyright (C) 2012-2014 Steven Barth <steven@midlink.org>
+ * Copyright (C) 2017 Hans Dedecker <dedeckeh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 as published by
#include <unistd.h>
#include <syslog.h>
#include <stdbool.h>
+#include <ctype.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
+#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/if.h>
#include <net/ethernet.h>
#include "odhcp6c.h"
+#ifdef LIBUBOX
+#include <libubox/md5.h>
+#else
#include "md5.h"
+#endif
#define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
static int request_prefix = -1;
static enum odhcp6c_ia_mode na_mode = IA_MODE_NONE, pd_mode = IA_MODE_NONE;
static bool accept_reconfig = false;
+// Server unicast address
+static struct in6_addr server_addr = IN6ADDR_ANY_INIT;
// Reconfigure key
static uint8_t reconf_key[16];
static unsigned int client_options = 0;
+static uint32_t ntohl_unaligned(const uint8_t *data)
+{
+ uint32_t buf;
+
+ memcpy(&buf, data, sizeof(buf));
+ return ntohl(buf);
+}
+
int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout)
{
client_options = options;
htons(DHCPV6_OPT_SIP_SERVER_A),
htons(DHCPV6_OPT_DNS_SERVERS),
htons(DHCPV6_OPT_DNS_DOMAIN),
+ htons(DHCPV6_OPT_UNICAST),
htons(DHCPV6_OPT_SNTP_SERVERS),
htons(DHCPV6_OPT_NTP_SERVER),
htons(DHCPV6_OPT_AFTR_NAME),
struct msghdr msg = {.msg_name = &srv, .msg_namelen = sizeof(srv),
.msg_iov = iov, .msg_iovlen = cnt};
- sendmsg(sock, &msg, 0);
+ switch (type) {
+ case DHCPV6_MSG_REQUEST:
+ case DHCPV6_MSG_RENEW:
+ case DHCPV6_MSG_RELEASE:
+ case DHCPV6_MSG_DECLINE:
+ if (!IN6_IS_ADDR_UNSPECIFIED(&server_addr) &&
+ odhcp6c_addr_in_scope(&server_addr)) {
+ srv.sin6_addr = server_addr;
+ if (!IN6_IS_ADDR_LINKLOCAL(&server_addr))
+ srv.sin6_scope_id = 0;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (sendmsg(sock, &msg, 0) < 0) {
+ char in6_str[INET6_ADDRSTRLEN];
+
+ syslog(LOG_ERR, "Failed to send DHCPV6 message to %s (%s)",
+ inet_ntop(AF_INET6, (const void *)&srv.sin6_addr,
+ in6_str, sizeof(in6_str)), strerror(errno));
+ }
}
// Receive rounds
for (; len < 0 && (round_start < round_end);
round_start = odhcp6c_get_milli_time()) {
- uint8_t buf[1536], cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+ uint8_t buf[1536];
+ union {
+ struct cmsghdr hdr;
+ uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
+ } cmsg_buf;
struct iovec iov = {buf, sizeof(buf)};
struct sockaddr_in6 addr;
struct msghdr msg = {.msg_name = &addr, .msg_namelen = sizeof(addr),
- .msg_iov = &iov, .msg_iovlen = 1, .msg_control = cmsg_buf,
+ .msg_iov = &iov, .msg_iovlen = 1, .msg_control = cmsg_buf.buf,
.msg_controllen = sizeof(cmsg_buf)};
struct in6_pktinfo *pktinfo = NULL;
// Allow
if (retx->handler_finish)
len = retx->handler_finish();
- } while (len < 0 && ((timeout == UINT32_MAX) || (elapsed / 1000 < timeout)) &&
+ } while (len < 0 && ((timeout == UINT32_MAX) || (elapsed / 1000 < timeout)) &&
(!retx->max_rc || rc < retx->max_rc));
return len;
}
continue;
md5_ctx_t md5;
- uint8_t serverhash[16], secretbytes[64], hash[16];
+ uint8_t serverhash[16], secretbytes[64];
+ uint32_t hash[4];
memcpy(serverhash, r->key, sizeof(serverhash));
memset(r->key, 0, sizeof(r->key));
uint16_t olen, otype;
uint8_t *odata, pref = 0;
struct dhcpv6_server_cand cand = {false, false, 0, 0, {0},
- DHCPV6_SOL_MAX_RT,
+ IN6ADDR_ANY_INIT, DHCPV6_SOL_MAX_RT,
DHCPV6_INF_MAX_RT, NULL, NULL, 0, 0};
bool have_na = false;
int have_pd = 0;
} else if (otype == DHCPV6_OPT_PREF && olen >= 1 &&
cand.preference >= 0) {
cand.preference = pref = odata[0];
+ } else if (otype == DHCPV6_OPT_UNICAST && olen == sizeof(cand.server_addr)) {
+ cand.server_addr = *(struct in6_addr *)odata;
} else if (otype == DHCPV6_OPT_RECONF_ACCEPT) {
cand.wants_reconfigure = true;
} else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
- uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
+ uint32_t sol_max_rt = ntohl_unaligned(odata);
if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
cand.sol_max_rt = sol_max_rt;
} else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
- uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
+ uint32_t inf_max_rt = ntohl_unaligned(odata);
if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
cand.inf_max_rt = inf_max_rt;
- } else if (otype == DHCPV6_OPT_IA_PD && request_prefix) {
+ } else if (otype == DHCPV6_OPT_IA_PD && request_prefix &&
+ olen >= -4 + sizeof(struct dhcpv6_ia_hdr)) {
struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
uint8_t *oend = odata + olen, *d;
dhcpv6_for_each_option(&h[1], oend, otype, olen, d) {
have_pd = p->prefix;
}
}
- } else if (otype == DHCPV6_OPT_IA_NA) {
+ } else if (otype == DHCPV6_OPT_IA_NA &&
+ olen >= -4 + sizeof(struct dhcpv6_ia_hdr)) {
struct dhcpv6_ia_hdr *h = (struct dhcpv6_ia_hdr*)&odata[-4];
uint8_t *oend = odata + olen, *d;
dhcpv6_for_each_option(&h[1], oend, otype, olen, d)
if (code != DHCPV6_Success)
continue;
- dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr));
+ dhcpv6_parse_ia(ia_hdr, odata + olen);
+ passthru = false;
+ } else if (otype == DHCPV6_OPT_UNICAST && olen == sizeof(server_addr)) {
+ server_addr = *(struct in6_addr *)odata;
passthru = false;
} else if (otype == DHCPV6_OPT_STATUS && olen >= 2) {
uint8_t *mdata = (olen > 2) ? &odata[2] : NULL;
dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret);
passthru = false;
- }
- else if (otype == DHCPV6_OPT_DNS_SERVERS) {
+ } else if (otype == DHCPV6_OPT_DNS_SERVERS) {
if (olen % 16 == 0)
odhcp6c_add_state(STATE_DNS, odata, olen);
} else if (otype == DHCPV6_OPT_DNS_DOMAIN) {
} else if (otype == DHCPV6_OPT_SIP_SERVER_D) {
odhcp6c_add_state(STATE_SIP_FQDN, odata, olen);
} else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) {
- refresh = ntohl(*((uint32_t*)odata));
+ refresh = ntohl_unaligned(odata);
passthru = false;
} else if (otype == DHCPV6_OPT_AUTH) {
if (olen == -4 + sizeof(struct dhcpv6_auth_reconfigure)) {
odhcp6c_add_state(STATE_AFTR_NAME, odata, olen);
passthru = false;
} else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) {
- uint32_t sol_max_rt = ntohl(*((uint32_t *)odata));
+ uint32_t sol_max_rt = ntohl_unaligned(odata);
if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN &&
sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX)
dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt;
passthru = false;
} else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) {
- uint32_t inf_max_rt = ntohl(*((uint32_t *)odata));
+ uint32_t inf_max_rt = ntohl_unaligned(odata);
if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN &&
inf_max_rt <= DHCPV6_INF_MAX_RT_MAX)
dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt;
if (orig != DHCPV6_MSG_INFO_REQ) {
// Update refresh timers if no fatal status code was received
- if ((ret > 0) && dhcpv6_calc_refresh_timers()) {
+ if ((ret > 0) && (ret = dhcpv6_calc_refresh_timers())) {
switch (orig) {
case DHCPV6_MSG_RENEW:
// Send further renews if T1 is not set
if (elen > 64)
elen = 64;
- if (elen <= 32 || elen <= entry.length) {
+ if (entry.length < 32 || elen <= entry.length) {
ok = false;
continue;
}
t1 = l_t1;
t2 = l_t2;
t3 = l_t3;
- } else {
- t1 = 600;
}
return (int)(ia_pd_entries + ia_na_entries);
static void dhcpv6_log_status_code(const uint16_t code, const char *scope,
- const void *status_msg, const int len)
+ const void *status_msg, int len)
{
- uint8_t buf[len + 3];
+ const char *src = status_msg;
+ char buf[len + 3];
+ char *dst = buf;
- memset(buf, 0, sizeof(buf));
if (len) {
- buf[0] = '(';
- memcpy(&buf[1], status_msg, len);
- buf[len + 1] = ')';
+ *dst++ = '(';
+ while (len--) {
+ *dst = isprint((unsigned char)*src) ? *src : '?';
+ src++;
+ dst++;
+ }
+ *dst++ = ')';
}
+ *dst = 0;
syslog(LOG_WARNING, "Server returned %s status %i %s",
scope, code, buf);
break;
case DHCPV6_UseMulticast:
- // TODO handle multicast status code
+ switch(orig) {
+ case DHCPV6_MSG_REQUEST:
+ case DHCPV6_MSG_RENEW:
+ case DHCPV6_MSG_RELEASE:
+ case DHCPV6_MSG_DECLINE:
+ // Message needs to be retransmitted according to RFC3315 chapter 18.1.8
+ server_addr = in6addr_any;
+ *ret = 0;
+ break;
+ default:
+ break;
+ }
break;
case DHCPV6_NoAddrsAvail:
}
}
+// Note this always takes ownership of cand->ia_na and cand->ia_pd
static void dhcpv6_add_server_cand(const struct dhcpv6_server_cand *cand)
{
size_t cand_len, i;
break;
}
- odhcp6c_insert_state(STATE_SERVER_CAND, i * sizeof(*c), cand, sizeof(*cand));
+ if (odhcp6c_insert_state(STATE_SERVER_CAND, i * sizeof(*c), cand, sizeof(*cand))) {
+ free(cand->ia_na);
+ free(cand->ia_pd);
+ }
}
static void dhcpv6_clear_all_server_cand(void)